CN210980113U - Air conditioner - Google Patents

Abstract

The utility model discloses an air conditioner, comprising a heat exchange circuit, a heat exchanger is arranged on the heat exchange circuit, the heat exchanger comprises a plurality of heat exchange parts arranged side by side, each heat exchange part is provided with a plurality of flat tubes, The two adjacent heat exchange parts are communicated through intermediate headers, each intermediate header includes a plurality of sub-cavities, and each sub-cavity is internally formed with a first cavity, a second cavity, and a third cavity The first cavity communicates with the flat tube on one of the heat exchange parts, the second cavity communicates with the flat tube on the other heat exchange part, the third cavity communicates with the first cavity, and the third cavity communicates with the flat tube on the other heat exchange part. A first circulation part is arranged below, the first circulation part communicates the third cavity with the second cavity, and a second circulation part is arranged above the second cavity, and the second circulation part connects the second cavity with the first cavity body connectivity. The intermediate header makes the refrigerant flow into different flat tubes in the next process more uniform, realizes the uniform distribution of the refrigerant, and improves the heat exchange effect of the air conditioner.

Description

an air conditioner

technical field

The utility model relates to the technical field of refrigeration equipment, in particular to an air conditioner with uniform refrigerant distribution.

Background technique

At present, the heat pump air conditioner is a kind of heating and cooling air conditioner that is often used. When cooling in summer, the air conditioner cools indoors and dissipates heat outdoors, and when heating in winter, the direction is opposite to that in summer, that is, indoor heating and outdoor cooling. Air conditioners exchange heat and cold between different environments through heat pumps. For example, in winter, outdoor air, ground water, groundwater, etc. are low-temperature heat sources, while indoor air is a high-temperature heat source. The function of heat pump air conditioning is to transfer heat from the outdoor environment to the indoor environment.

Referring to FIG. 1 , a schematic diagram of a heating cycle of a heat pump in the prior art is shown. The heat pump includes: an evaporator 1, a compressor 2, a condenser 3, an expansion valve 4 and a four-way reversing valve C. The specific working process of the heat pump heating is as follows: first, the low-pressure two-phase refrigerant (a mixture of liquid-phase refrigerant and gas-phase refrigerant) in the evaporator 1 absorbs heat from the low-temperature environment; high-pressure gas refrigerant; then, the high-temperature and high-pressure gas refrigerant releases heat energy to the indoor environment in the condenser 3, while its own temperature decreases; finally, it is throttled through the expansion valve mechanism 4 and becomes a low-temperature and low-pressure two-phase refrigerant, Enter the evaporator 1 again, and repeat the heating process of the above cycle. The heat exchanger described herein includes the evaporator 1 and the condenser 3 described above.

The heat pump air conditioner changes the working mode through the four-way reversing valve C. Under summer cooling conditions, the indoor heat exchanger is used as the evaporator 1, and the outdoor heat exchanger is used as the condenser 3. The indoor air is cooled down through the surface of the evaporator 1 to achieve the purpose of lowering the indoor temperature, and the heat is transported to the outdoors through the condenser 3 . When supplying heat in winter, change the position of the four-way reversing valve C valve block to change the flow direction of the refrigerant. At this time, the refrigerant absorbs the heat in the environment through the outdoor heat exchanger, and releases heat to the indoor environment to achieve heating purpose.

Evaporator 1 is a device that outputs cooling capacity, and its function is to evaporate the refrigerant liquid flowing in through expansion valve 4 to absorb the heat of the object to be cooled and achieve the purpose of refrigeration. The condenser 3 is a device for outputting heat. The heat absorbed from the evaporator 1 and the heat converted from the work consumed by the compressor 2 are taken away by the cooling medium in the condenser 3 to achieve the purpose of heating. Evaporator 1 and condenser 3 are important parts of heat exchange in the air-conditioning heat pump unit, and their performance will directly affect the performance of the entire system.

Compared with finned-tube heat exchangers, microchannel heat exchangers have significant advantages in material cost, refrigerant charge and heat flux density, which are in line with the development trend of heat exchangers for energy conservation and environmental protection. Microchannel heat exchangers include flat tubes, fins, headers, end caps and other components. Separating baffles are also inserted in the headers of the multi-flow microchannel heat exchanger, and the baffles divide the headers into a plurality of independent cavities, and each header cavity is connected to a certain number of flat tubes. When the microchannel heat exchanger is used as an evaporator, when the gas-liquid two-phase refrigerant enters the multiple flat tubes from the header cavity, due to the difference in the density and viscosity of the gas phase and the liquid phase, the flowing refrigerant is easily affected by gravity and viscosity. The separation occurs under the action of force, resulting in uneven refrigerant entering into multiple flat tubes. Uneven refrigerant not only deteriorates the heat exchange efficiency, but also causes fluctuations in the refrigeration system. Therefore, it is an important issue to realize the uniform distribution of the two-phase refrigerant in different flat tubes in the same process.

SUMMARY OF THE INVENTION

In view of this, the present utility model proposes an air conditioner. When the gas-liquid two-phase refrigerant flows between multiple rows of micro-channel heat exchangers, the intermediate collector tube makes the flow of the refrigerant entering into different flat tubes in the next process more uniform. , to achieve uniform distribution of the refrigerant and improve the heat exchange effect of the air conditioner.

To achieve the above object, the utility model adopts the following technical solutions:

An air conditioner includes a heat exchange circuit for exchanging heat between indoors and outdoors, and a heat exchanger is arranged on the heat exchange circuit; the heat exchanger includes: a plurality of heat exchange parts, which are arranged side by side The heat exchange part is provided with a plurality of flat tubes, and the refrigerant circulates in the flat tubes; the intermediate header is communicated with the flat tubes on the two adjacent heat exchange parts, and is used for circulation , distribute the refrigerant evenly; wherein, the intermediate header includes: a plurality of sub-cavities, which are arranged along the height direction of the intermediate header; each of the sub-cavities includes: a first a cavity, communicated with a part of the flat tubes on one of the heat exchange parts, and used for circulating the refrigerant; a second cavity, communicated with a part of the flat tubes on the other heat exchange part, used to circulate the refrigerant; a third cavity, communicated with the first cavity, used to circulate the refrigerant; a first circulation part, located below the third cavity, used to communicate the The second cavity and the third cavity; the second flow part is located above the second cavity and is used for connecting the first cavity and the second cavity.

Further, the side wall of the first cavity is provided with a first mounting portion for mounting the flat tube, and the side wall of the second cavity is provided with a second mounting portion for mounting the flat tube ; The first mounting portion and the second mounting portion are located on the same side of the sub-cavity.

Further, a first partition plate, a second partition plate and a third partition plate are arranged in the sub-cavity; the first partition plate is arranged in the first cavity and the second cavity between the first cavity and the third cavity, the second circulation part is arranged on the upper part of the first partition plate; the second partition plate is arranged between the first cavity and the third cavity, the first The second partition plate is provided with a plurality of third circulation parts for the refrigerant to circulate; the third partition plate is arranged between the second cavity and the third cavity, and the first The circulation part is provided in the lower part of the said 3rd partition plate.

Further, there is a certain distance between the end of the flat tube located in the first cavity and the third circulation portion, and faces the third circulation portion.

Further, the heat exchanger includes a first row of heat exchange parts and a second row of heat exchange parts, the first heat exchange part is located in the downwind area of the air supply direction, and the second heat exchange part is located in the air supply direction. an upwind area; the heat exchanger has a first flow, a second flow, a third flow, and a fourth flow, wherein the first flow and the fourth flow are located on the first row of heat exchange parts, The second flow and the third flow are located on the heat exchange part of the second row; the flat tubes arranged in the first flow and the flat tubes arranged in the second flow are connected. through the intermediate header; the flat tubes provided in the third process flow and the flat tubes provided in the fourth process are communicated through the intermediate header.

Further, the number of the flat tubes in the first process, the second process, the third process, and the fourth process gradually increases.

Further, one end of the flat tube arranged in the second process is connected with a third header, and one end of the flat tube arranged in the third process is connected with a second header, so The second header and the third header communicate with each other through a connecting pipe.

Further, a cavity portion, a plurality of uniformly spaced channel portions, and a spoiler portion disposed in the cavity portion are formed in the second header; the cavity portion and one end of the connecting pipe are formed One end of the channel portion is communicated with the cavity portion, and the other end is communicated with the flat tube provided in the third process.

Further, the second header has at least one; the third header is provided with a plurality of third partitions, and the plurality of third partitions separate the internal space of the third header into a plurality of independent third chambers, wherein one of the third chambers is simultaneously connected to a part of the flat tubes in the second process and a part of the flat tubes in the third process, and the other The number of the third chambers is the same as the number of the second headers, and each of the remaining third chambers is communicated with each of the second headers in a one-to-one correspondence through the connecting pipes.

Further, one end of the first row of heat exchange parts is provided with a first header, in which an upper chamber and a lower chamber for circulating refrigerant are formed, and the upper chamber is connected to the fourth header. The flat tubes in the process are communicated, and the lower chamber is communicated with the flat tubes provided in the first process; the lower chamber is connected with a gas distribution pipe group and a liquid distribution pipe group, and the gas distribution pipe The separator is used to separate the gas phase refrigerant from the liquid phase refrigerant, the gas phase refrigerant enters the lower chamber through the gas separator tube group, and the liquid phase refrigerant enters the lower chamber. The phase refrigerant enters the lower chamber through the liquid separator set.

The technical scheme of the present utility model has the following technical effects relative to the prior art:

The two adjacent heat exchangers are communicated through an intermediate header, and a plurality of mutually independent sub-cavities are formed inside the intermediate header, and a first cavity and a second cavity are formed inside each sub-cavity. , and a third cavity, the first cavity communicates with part of the flat tubes on one of the heat exchangers, the second cavity communicates with part of the flat tubes on the other heat exchanger, and the third cavity communicates with the first cavity Communication, a first circulation part is arranged below the third cavity, the first circulation part communicates the third cavity with the second cavity, and a second circulation part is arranged above the second cavity, and the second circulation part connects the third cavity to the second cavity. The second cavity is communicated with the first cavity.

When the heat exchanger is used as an evaporator, the refrigerant first enters the first cavity, most of the refrigerant in the first cavity will flow into the third cavity, and the gas-liquid two-phase refrigerant entering the third cavity tends to be under the action of gravity. The refrigerant in the third cavity enters the second cavity through the first circulation part below. Since the flow rate of the gas-phase refrigerant is higher than that of the liquid-phase refrigerant, the gas-phase refrigerant above the third cavity When the refrigerant flows downward through the first circulation part, it will be mixed with the liquid-phase refrigerant below, and then enters the second cavity through the acceleration effect of the first circulation part, and flows into the second cavity from bottom to top. The gas-liquid two-phase refrigerant is evenly distributed in the flat tube. During the bottom-up flow of the refrigerant in the second cavity, the speed of the refrigerant decreases, and a vortex is formed in the upper part of the second cavity. The refrigerant flow rate of the flat tube at the vortex is small, and the second circulation part will make the refrigerant more in the upward process. The outgoing refrigerant is introduced into the first cavity, mixed with the high-speed refrigerant in the first cavity, and participates in the distribution process of the next cycle, thereby further improving the uniform distribution of the refrigerant, thereby improving the heat exchange effect of the air conditioner.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the principle schematic diagram of the prior art air conditioner;

2 is a schematic structural diagram of Embodiment 1 of the heat exchanger of the present invention;

Fig. 3 is the enlarged view of A part in Fig. 2;

Fig. 4 is the top view of the separator of Embodiment 1 of the heat exchanger of the present invention;

5 is a schematic diagram of the internal structure of a separator in Embodiment 1 of the heat exchanger of the present invention;

Fig. 6 is A-A sectional view in Fig. 5;

Fig. 7 is B-B in Fig. 5 sectional view;

8 is a schematic structural diagram of Embodiment 2 of the heat exchanger of the present invention;

Fig. 9 is the first structural schematic diagram of the second header of the second embodiment of the heat exchanger of the present invention;

Fig. 10 is the second structural schematic diagram of the second header of the second embodiment of the heat exchanger of the utility model (the side plate is omitted);

11 is a top view of the second header of the second embodiment of the heat exchanger of the present invention;

Figure 12 is a sectional view taken along the direction C-C in Figure 11;

Fig. 13 is the sectional view of D-D in Fig. 11;

14 is a schematic diagram of the refrigerant flow inside the second header of the second embodiment of the heat exchanger of the present invention;

15 is a schematic structural diagram of the second structural form of the second header of the second embodiment of the heat exchanger of the present invention;

16 is a schematic structural diagram of the third structural form of the second header of the second embodiment of the heat exchanger of the present invention;

17 is a schematic structural diagram 1 (evaporation working condition) of the third embodiment of the heat exchanger of the present invention;

Fig. 18 is the second structural schematic diagram (condensing condition) of the third embodiment of the heat exchanger of the utility model;

19 is a schematic structural diagram of the actual installation of the third embodiment of the heat exchanger of the present invention;

Fig. 20 is the first structural schematic diagram of the intermediate header in the third embodiment of the heat exchanger of the present invention;

21 is a second structural schematic diagram of the intermediate header of Embodiment 3 of the heat exchanger of the present invention from another perspective;

Figure 22 is a schematic structural diagram of the third embodiment of the heat exchanger of the present invention, where the intermediate headers communicate with the flat tubes;

FIG. 23 is a top view of the intermediate header in Embodiment 3 of the heat exchanger of the present invention;

24 is a top view of another structural form of the intermediate header in Embodiment 3 of the heat exchanger of the present invention;

Figure 25 is a cross-sectional view of Figure 23 in the direction H1-H1;

Figure 26 is a cross-sectional view in the direction of H2-H2 in Figure 23;

FIG. 27 is a cross-sectional view taken along the line H3-H3 in FIG. 23 .

Reference number:

1-evaporator, 2-compressor, 3-condenser, 4-expansion valve, 5-four-way reversing valve;

01-first header, 011-upper chamber, 012-lower chamber, 013-small chamber, 014-first partition;

02-second header, 021-cavity part, 022-channel part, 023-spoiler part, 024-inner wall, 025-insertion part, 026-bending part;

03-the third header, 031-the third separator, 032-the third chamber;

04-The fourth header;

05-Intermediate header, 051-Sub-chamber, 0511-First partition plate, 0512-Second partition plate, 0513-Third partition plate, 052-First cavity, 053-Second cavity , 054-the third cavity, 055-the first circulation part, 056-the second circulation part, 057-the third circulation part, 058-the first installation part, 059-the second installation part;

06-separator, 061-separator cavity, 062-first baffle plate, 063-second baffle plate, 064-gap, 065-refrigerant flow port;

07-split gas pipe group, 071-split gas main pipe, 0711-first gas split pipe, 0712-second gas split pipe, 072-split gas branch pipe;

08-dispensing tube group, 081-dispensing main pipe;

09-connecting pipe, 091-first connecting pipe, 092-second connecting pipe;

10-fins;

11-flat tube;

12-tracheal group, 121-tracheal branch;

13 - heat exchange part, 131 - first row heat exchange part, 132 - second row heat exchange part.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal" , "top", "bottom", "inside", "outside" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, only for the convenience of describing the present utility model and simplifying the description, rather than indicating Or imply that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Disconnect the connection, or connect it in one piece. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations. In the foregoing description of the embodiments, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more of the embodiments or examples.

The terms "first", "second", "third", and "fourth" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, a feature defined as "first", "second", "third", "fourth" may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

The utility model discloses an air conditioner, especially a heat pump type air conditioner. The air conditioner comprises a heat exchange circuit, which is used for heat exchange between indoors and outdoors, so as to realize the regulation of indoor temperature by the air conditioner.

The heat exchange circuit can adopt the heat exchange principle shown in Fig. 1 of the prior art, that is, the heat exchange circuit includes an evaporator 1, a compressor 2, a condenser 3, an expansion valve 4 and a four-way reversing valve C, and the evaporator The phase change process of the refrigerants in the 1 and the condenser 3 is opposite, and the evaporator 1 and the condenser 3 are collectively referred to as heat exchangers.

One of the purposes of the utility model is to improve the structure of the heat exchanger, improve the balanced distribution of refrigerant in the heat exchanger, improve the heat exchange effect of the heat exchanger, and further improve the overall heat exchange effect of the air conditioner.

The utility model improves the structure of the inflow end and outflow end of the refrigerant, the communication transition between different processes, and the communication transition of the side-by-side heat exchanger, in order to improve the uniform distribution of the refrigerant.

The heat exchanger includes a number of flat tubes 11 and fins 10 arranged at equal intervals. A plurality of micro-channels for circulating refrigerant are formed in the flat tubes 11, and the fins 10 are arranged between two adjacent flat tubes 11. During this time, the flow direction of the air flowing through the fins 10 and the flow direction of the refrigerant flowing through the flat tubes 11 are perpendicular to each other.

The flat tube 11 samples the porous micro-channel aluminum alloy, and the fins 10 are aluminum alloys with a brazing composite layer on the surface, which are light in weight and high in heat exchange efficiency.

Example 1

2 to 7 are used to illustrate the structure of the first embodiment of the heat exchanger. In the first embodiment, the heat exchanger has a first flow and a second flow, and the flow directions of the refrigerants in the two flow are opposite. The flow direction of the refrigerant in the flat tube 11 when the heat exchanger is used as an evaporator.

The heat exchanger also includes a first header 01 and a fourth header 04. The first header 01 is arranged at one end of the heat exchanger and communicates with one end of the flat tube 11. The fourth header 04 is arranged at the end of the heat exchanger. The other end of the heater communicates with the other end of the flat tube 11 .

The first header 01 is formed with an upper chamber 011 and a lower chamber 012 for circulating refrigerant, the upper chamber 011 is communicated with the flat tubes 11 in the second process, and the lower chamber 012 is connected with the first process The flat tubes 11 communicate with each other.

The heat exchanger also includes a separator 06 , a gas distribution pipe group 07 , and a liquid distribution pipe group 08 .

Among them, the separator 06 is used for separating gas-phase refrigerant and liquid-phase refrigerant.

The gas distribution pipe group 07 is communicated between the separator 06 and the lower chamber 012, and is used for circulating the gas-phase refrigerant.

The liquid distribution pipe group 08 is communicated between the separator 06 and the lower chamber 012, and is used for circulating liquid-phase refrigerant.

When the heat exchanger is used as an evaporator, the gas-liquid two-phase refrigerant is effectively separated by the separator 06 before entering the lower chamber 012. The liquid separator group 08 enters the lower chamber 012, which fundamentally avoids the interaction and separation of the two-phase refrigerants during the flow process, thereby ensuring the quality and flow of the gas-phase and liquid-phase refrigerants entering the lower chamber 012. are approximately equal, so that there is no phenomenon of gas-liquid separation of the refrigerant in the lower chamber 012 , thereby improving the distribution uniformity of the refrigerant in the flat tube 11 .

4 and 5, a separator cavity 061 is formed inside the separator 06, a refrigerant flow port 065 is provided on the side wall of the separator 06, and the refrigerant flow port 065 is connected to the separator cavity. The cavity 061 is communicated, and the refrigerant flows into the separator cavity 061 through the refrigerant flow port 065 .

3 to 5, the gas distribution pipe group 07 includes a gas distribution main pipe 071 and a plurality of moisture gas branch pipes 072 communicated with the gas distribution main pipe 071, the gas distribution main pipe 071 extends into the separator cavity 061, and the gas distribution branch pipe 072 is horizontal The gas-phase refrigerant in the separator cavity 061 flows out from the gas branch main pipe 071, and then enters the lower chamber 012 through a plurality of gas branch branch pipes 072, so that each refrigerant in the lower chamber 012 The gas-phase refrigerant flow is uniform.

Further, referring to FIG. 3 , the gas branch main pipe 071 includes a first gas branch pipe 0711 and a second gas branch pipe 0712 that communicate with each other, the first gas branch pipe 0711 is communicated with the separator cavity 061, and the first gas branch pipe 0711 is The separator cavity 061 extends upward for a certain distance and then communicates with the second gas distribution main pipe 0712 through the arc portion. Equidistantly arranged, the gas-phase refrigerant is branched from top to bottom along the second gas-splitting main pipe 0712 and enters the plurality of gas-splitting branch pipes 072, so as to improve the uniform distribution of the gas-phase refrigerant.

In the separator cavity 061, the gas-phase refrigerant tends to flow to the upper part of the separator cavity 061. Referring to FIG. 5, one end of the first gas distribution main pipe 0711 is set close to the top of the separator cavity 61, so that the upper gas phase refrigerant inflow of refrigerant.

Continuing to refer to FIG. 3 to FIG. 5 , the liquid distribution pipe group 08 includes a liquid distribution main pipe 081 and a plurality of liquid distribution branch pipes (not shown) communicating with the liquid distribution main pipe. The liquid distribution main pipe 081 extends into the separator cavity 61, The liquid branch pipe 081 extends in the horizontal direction and communicates with the lower chamber 012. The liquid-phase refrigerant in the separator cavity 061 flows out from the liquid distribution main pipe 081, and then enters the lower chamber 012 through a plurality of liquid distribution branch pipes, so that the lower chamber The flow rate of the liquid-phase refrigerant at each location in the chamber 012 is uniform.

Further, the liquid-separating main pipe 081 includes a first liquid-separating main pipe and a second liquid-separating main pipe which are in communication, the first liquid-separating main pipe is communicated with the separator cavity 061, and the first liquid-separating main pipe extends upward from the separator cavity 061 for a section. After the distance, it communicates with the second liquid separation main pipe through the arc-shaped part, the second liquid separation main pipe extends downward, a plurality of liquid separation branch pipes 082 are arranged equidistantly along the height direction of the second liquid separation main pipe, and the liquid-phase refrigerant flows along the second liquid separation main pipe. The liquid main pipe is divided from top to bottom into a plurality of liquid distribution branch pipes to improve the uniform distribution of liquid-phase refrigerant.

In the separator cavity 061, the liquid-phase refrigerant tends to flow toward the bottom of the separator cavity 061. Referring to FIG. 5, one end of the first liquid separation main pipe is close to the bottom of the separator cavity 061 and has a certain distance, so that inflow of the lower liquid-phase refrigerant.

The refrigerant separated by the air distribution pipe group 07 and the liquid distribution pipe group 08 enters the lower chamber 012 from top to bottom and then is divided into the flat pipe 11. Compared with the traditional bottom-up distribution method, the refrigerant can be suppressed. The effect of gravity and the resulting separation during the upward splitting process.

5 and 6, the separator cavity 061 is provided with a first baffle plate 062, which is located below the end of the first gas distribution main pipe 0711 and has a certain distance from the end of the first gas distribution main pipe 0711, The first baffle 0662 can improve the separation efficiency of the gas-liquid two-phase refrigerant in the upward process, and can prevent the liquid-phase refrigerant from entering the first gas separation main pipe 0711 under the action of inertia.

In order to further improve the separation efficiency of the gas-liquid two-phase refrigerant, referring to FIG. 5 and FIG. 7 , the separator cavity 061 is also provided with a second baffle 063, and the first baffle 062 and the second baffle 063 are respectively provided with liquid separation main pipes On both sides of 081, there is a certain gap 064 between the second baffle 063 and the liquid separation main pipe 081, and the gas-phase refrigerant continues to flow upward from the gap 064.

Referring to FIG. 3 , the lower chamber 012 is provided with a plurality of first partitions 014 arranged at equal intervals, and the plurality of first partitions 014 divide the lower chamber 012 into a plurality of small chambers 013, each small chamber 013 is connected with the same number of flat tubes 11, and each small chamber 013 is connected with a gas branch pipe 072 and a liquid branch pipe, so that the flow of refrigerant entering each small chamber 013 is uniform, and the refrigerant with the same flow is again It is evenly distributed into the same number of flat tubes 11 to achieve uniform flow of refrigerant in each flat tube 11 .

In this embodiment, 10 small chambers 013 are formed in the lower chamber 012 , and each of the small chambers 013 communicates with two flat tubes 11 . Of course, in other embodiments, the number of small chambers 013 and the number of flat tubes 11 in each small chamber 013 can be flexibly set according to actual conditions, which is not specifically limited in this embodiment.

This embodiment provides a specific implementation for the fourth header 04. Referring to FIG. 2, the fourth header 04 is formed with mutually independent chambers M1, M2, M3, M4, and the chamber M5, the chamber M1 and the chamber M5 are communicated through the first connecting pipe 091, the chamber M2 and the chamber M4 are communicated through the second connecting pipe 092, and the refrigerant flowing into the chamber M1 passes through the first connecting pipe 092. The connecting pipe 091 enters the chamber M5, the refrigerant flowing into the chamber M2 enters the chamber M4 through the second connecting pipe 092, and the refrigerant entering the chamber M3 flows upward and enters the flat tube 11 in the second process .

The interior of the lower chamber 012 and the fourth header 04 adopts a compartment design to ensure that the pressure loss along the process and the local pressure loss of the refrigerant from entering the first header 01 to leaving the first header 01 are equal, Ensure that the heat exchanger as a whole has a good split flow uniformity.

Further, when the two-phase refrigerant is boiling and exchanging heat in the flat tube 11, the specific volume and flow rate gradually increase, the degree of gas-liquid mixing increases, and the separation uniformity is improved. Therefore, the number of flat tubes along the refrigerant flow direction should gradually decrease; On the contrary, when the two-phase refrigerant condenses and exchanges heat in the flat tube, the specific volume and flow rate gradually decrease, and the gas and liquid tend to separate. The number should gradually increase. Therefore, in this embodiment, when the heat exchanger is used as an evaporator, the number of flat tubes 11 connected to the chamber M1 is smaller than the number of flat tubes 11 connected to the chamber M5, and the number of flat tubes 11 connected to the chamber M2 is smaller than that of the chamber M2. The number of the flat tubes 11 connected to the chamber M4, when the heat exchanger is used as an evaporator, the number of the flat tubes 11 flowing into the chamber M3 is greater than the number of the flat tubes 11 flowing out of the chamber M3.

Further, one end of the first connecting pipe 091 is connected to the lower end of the chamber M1, so that the liquid-phase refrigerant in the lower part of the chamber M1 flows into the first connecting pipe 091; the other end of the first connecting pipe 091 is connected to the chamber M5. At the upper end, the refrigerant in the first connecting pipe 091 flows into the chamber M5 from top to bottom, and the flow uniformity of the refrigerant in the flat pipe 11 communicated with the chamber M5 is improved by gravity.

Similarly, one end of the second connecting pipe 092 is connected to the lower end of the chamber M2 to facilitate the inflow of the liquid-phase refrigerant at the lower part of the chamber M2 into the second connecting pipe 092; the other end of the second connecting pipe 092 is connected to the lower end of the chamber M4 At the upper end, the refrigerant in the second connecting pipe 092 flows into the chamber M4 from top to bottom, and uses gravity to improve the flow uniformity of the refrigerant in the flat pipe 11 communicating with the chamber M4.

Referring to FIG. 2 , in the first embodiment, the heat exchanger further includes a gas pipe group 12 , and the gas pipe group 12 includes a plurality of gas pipe branches 121 , and the plurality of gas pipe branches 121 are all communicated with the upper chamber 011 , and the refrigeration in the upper chamber 011 The agent is collected from the plurality of tracheal branches 121 and then flows out.

In the first embodiment, when the heat exchanger is used as an evaporator, the refrigerant enters the separator 06 from the refrigerant flow port 065, and the gas-phase refrigerant enters the lower chamber 012 of the first header 01 through the gas distribution pipe group 07, and the liquid refrigerant enters the lower chamber 012 of the first header 01. The phase refrigerant enters the lower chamber 012 of the first header 01 through the liquid separation tube group 08, and then the gas-liquid two-phase refrigerant enters the plurality of flat tubes 11 in the first process at the same time, and then passes through the first connecting pipe. 091 , the second connecting pipe 092 , and the fourth header 04 enter the plurality of flat tubes 11 in the second process, and finally flow out from the trachea group 12 through the upper chamber 011 of the first header 01 .

In the first embodiment, when the heat exchanger is used as a condenser, the flow direction of the refrigerant in the heat exchanger is opposite to that when it is used as an evaporator, which will not be repeated here.

Embodiment 2

Referring to FIG. 8 , the heat exchanger has an upward flow and a downward flow. The upward flow and the downward flow are for the flow direction of the refrigerant, and are only for the convenience of the description of the technical solution. The process is called an upstream process, and the second process is called a downstream process.

In the second embodiment, the technical solution is described by taking the heat exchanger having the first flow and the second flow as an example, the first flow is the upward flow, and the second flow is the downward flow.

The first flow and the second flow are communicated through the second header 02 and the third header 03. Specifically, the second header 02 is communicated with the flat tubes 11 in the second flow, and the third header At the same time, it communicates with the flat tubes 11 in the first process and part of the flat tubes 11 in the second process, and the second header 02 and the third header 03 are communicated through the connecting pipe 09 .

9 to 14 , the second header 02 includes a cavity part 021 , a channel part 022 , and a spoiler 023 , the cavity part 021 communicates with the connecting pipe 09 , and one end of the channel part 022 communicates with the cavity part 021 , the other end of the channel portion 022 is communicated with the flat tube 11 in the second process flow, and the flow turbulence portion 023 is arranged in the cavity portion 021 to disturb the flow path of the refrigerant in the cavity portion 021 and promote the cavity portion 021 The refrigerant in the inner high pressure zone is mixed with the low pressure zone.

Specifically, the refrigerant in the first process flat tube 11 enters the second header 02 through the third header 03 and the connecting pipe 09. When the refrigerant enters the second header 02, the gas-liquid two-phase refrigerant first Entering the cavity 021, the greater the refrigerant flow rate, the more obvious the uneven distribution of the refrigerant, and the low pressure will be generated at the inflow end of the refrigerant, thereby forming a high pressure area and a low pressure area in the cavity 021, and the turbulence part 023 can effectively To avoid the flow dead zone caused by eddy current in the cavity part 021, the spoiler part 023 disturbs the flow path of the refrigerant in the cavity part 021, and promotes the mixing of the refrigerant in the high pressure area and the low pressure area in the cavity part 021, and the refrigerant The refrigerant circulates in the cavity portion 021, and the refrigerant circulation path formed by the spoiler portion 023 can automatically adapt to the change of the refrigerant flow rate, so that the refrigerant entering the different channel portions 022 can be evenly distributed, so as to realize the same flat tube 11. The refrigerant flow in different microchannels and different flat tubes 11 in the same process is uniform.

9 and 10 , the second header 02 includes a header body, and a plurality of channel portions 022 are formed inside the header body by a plurality of spaced inner walls 024 , and the plurality of channel portions 022 are evenly spaced, and the current collectors A cavity 021 is formed at the bottom of the main body of the tube, a plurality of flat tubes 11 are connected to the side wall of the main body of the header, a connecting tube 09 is connected to the other side wall of the main body of the header opposite to the flat tubes, and the channel portion 022 One end is communicated with the cavity portion 021, and the other end of the channel portion 022 is communicated with the flat tube 11. In FIG. 10, in order to facilitate the representation of the internal structure of the main body of the header, one side wall is hidden and not shown.

In the second embodiment, the main body of the header is a square structure, and the channel portions 022 formed by the plurality of inner wall surfaces are of a flat structure. In other embodiments, the main body of the header can be a cylindrical structure, an elliptical column structure, etc. make specific restrictions.

The plurality of channel portions 022 are evenly spaced, so that the refrigerant in the cavity portion 021 can flow into different channel portions 022 evenly, thereby ensuring uniform flow of refrigerant in the flat tubes 11 communicating with each channel portion 022 .

The channel part 022 has a bent part 026, the side of the channel part 022 close to the cavity part 021 is perpendicular to the cavity part 021, and the side of the channel part 022 close to the flat tube 11 is parallel to the flat tube 11, which is convenient for the refrigerant in the cavity part The flow between the 021 and the channel part 022 and between the flat tube 11 and the channel part 022.

In other embodiments, the channel portion 022 may be a flow channel with other structural forms, such as a flow channel with a circular arc surface. In order to balance the resistance between different channels, the number of channel re-turns and the surface roughness of the channel portion may be changed.

An insertion portion 025 is provided on the side wall of the header main body, the insertion portion 025 communicates with the channel portion 022 , and the flat tube 11 is inserted into the insertion portion 025 to realize the communication between the flat tube 11 and the channel portion 022 .

The number of flat tubes 11 that can be connected to each second header 02 can be flexibly set according to actual conditions. In the second embodiment, the number of flat tubes 11 that can be connected to each second header 02 is 1-20.

10 to 14, FIG. 12 is a sectional view taken along the C-C direction in FIG. 11, and FIG. 13 is a sectional view taken along the D-D direction in FIG. 11. The spoiler 023 is a partition structure arranged in the cavity 021. The inflow direction extends in a direction parallel to the inflow direction, and the partition structure is an incomplete partition, that is, the partition structure and the surrounding inner walls of the cavity portion 021 all have a certain gap.

The arrows in Fig. 14 show the flow direction of the refrigerant. When the gas-liquid two-phase refrigerant evaporates in the heat exchanger, the refrigerant flowing into the cavity 021 through the connecting pipe 09 flows directly upward and enters the passage directly. In 022, another part of the refrigerant bypasses the spoiler 023 and enters the side of the cavity 021 away from the refrigerant inlet (that is, the left part in the orientation shown in Figure 14), and this part of the refrigerant bypasses the spoiler. While 023 is flowing, part of the refrigerant will flow into the channel part 022, and the remaining part of the refrigerant will bypass the spoiler part 023 and then mix with the newly inflowing refrigerant to enter the next flow cycle. Since the refrigerant enters the cavity portion 021 from the connecting pipe 09 with a relatively high flow velocity, the pressure at the inlet of the refrigerant in the cavity portion 021 is relatively low, so that the refrigerant that fails to flow into the passage portion 022 in time can bypass the turbulent portion. 023 circulating flow, the refrigerant circulation flow path formed in the cavity part 021 is beneficial to improve the uniform distribution of the refrigerant in the cavity part 021, so that the refrigerant entering the different channel parts 022 is uniform, and then the refrigerant in the different flat tubes is uniform. The refrigerant is uniform.

At high flow rate, the uneven distribution of refrigerant is more obvious. When the flow rate of refrigerant is large, the effect of this scheme on the uniform distribution of refrigerant is more significant. Because the larger the flow rate, the more significant the low-pressure effect caused by the injection at the refrigerant inlet of the cavity part 021, and the more significant the circulation loop that drives the refrigerant to flow around the spoiler 023, and the circulation loop of the refrigerant automatically adapts to the change of the external refrigerant flow rate , improve the uniform distribution of refrigerant.

Since the channel portion 022 has a flat structure, the flat structure exactly matches the structure of the flat tube 11 , and the uniform distribution of the refrigerant in the channel portion 022 is also beneficial to improve the refrigeration entering into different microchannels in the same flat tube 11 . Dosage uniformity.

Referring to FIGS. 11 and 14 , the connecting pipe 023 is preferably disposed on the side of the cavity portion 021 away from the air supply direction, which is beneficial to improve the heat dissipation efficiency.

FIG. 15 and FIG. 16 show other two modified structural forms of the spoiler 023. By increasing the number of spoilers 023 to form multiple backflows and multiple spoilers in the cavity 021, the refrigerant efficiency is further improved. Evenly distribute the effect.

In FIG. 15 , the spoiler 023 is two partition structures arranged at intervals. The partition structure is the same as that shown in FIG. 14 , but the arrangement is different. In FIG. 15 , the two spoilers 023 are located in the cavity 021 The distribution is symmetrical with respect to the position where the refrigerant flows into the cavity portion 021 . The refrigerant flowing into the cavity 021 first enters between the two spoilers 023, and then is divided into two paths, one of the refrigerants goes around the spoiler 023 on the left to form a circulation loop, and the other refrigerant goes around the spoiler 023 on the right. The flow portion 023 forms a circulation loop.

In FIG. 16 , the spoilers 023 are three partition structures arranged at intervals. The partition structure is the same as that shown in FIG. 14 , but the arrangement is different. In FIG. 16 , the three spoilers 023 are located in the cavity 021 The distribution is symmetrical with respect to the position where the refrigerant flows into the cavity 021 , and the spoiler 023 located in the middle is directly opposite to the connecting pipe 09 . The refrigerant flowing into the cavity 021 is divided into two paths, one path flows along the gap between the left spoiler 023 and the middle spoiler 023, and forms a circulation loop around the left spoiler 023, and the other path runs along the gap between the left spoiler 023 and the middle spoiler 023. Flow through the gap between the right spoiler 023 and the middle spoiler 023 , and form a circulation loop around the right spoiler 023 .

Returning to FIG. 8 , the second header 02 has at least one, and the third header 03 is provided with a plurality of third partitions 031 , and the plurality of third partitions 031 separate the internal space of the third header 03 into a plurality of independent third chambers 032, one of the third chambers 032 is simultaneously connected to part of the flat tubes 11 in the upward flow (the first flow) and part of the flat tubes 11 in the downward flow (the second flow), and the rest The number of the third chambers 031 is the same as the number of the second headers 02 , and each of the remaining third chambers 031 is communicated with each of the second headers 02 in a one-to-one correspondence through the connecting pipe 09 .

In the second embodiment, there are two second headers 02, and three third partitions 031 are arranged in the third header 03. The third partitions 031 divide the interior of the third header 03 into three independent The third chamber 032 is designated as N1, N2, and N3 in sequence, wherein the second header 02 at the top communicates with the third chamber N1 through the first connecting pipe 091, and the second header 02 at the bottom communicates with the third chamber N1. The three chambers N2 are communicated through the second connecting pipe 092, and the third chamber N3 is simultaneously communicated with part of the flat tubes 11 in the first process and part of the flat tubes 11 in the second process.

The cooperation of the plurality of third chambers 032 and the plurality of second headers 02 is beneficial to further improve the uniform distribution of the refrigerant.

One end of the first connecting pipe 091 is connected to the lower end of the third chamber N1, so that the liquid-phase refrigerant in the third chamber N1 can flow into the first connecting pipe 091, and the other end of the first connecting pipe 091 is connected to the second collecting pipe. The lower end of the flow pipe 02 is communicated with the cavity portion 021 , so that the gas-liquid two-phase refrigerant can be evenly distributed through the second header 02 .

Similarly, one end of the second connecting pipe 092 is connected to the lower end of the third chamber N2, so that the liquid-phase refrigerant in the third chamber N2 can flow into the second connecting pipe 092, and the other end of the second connecting pipe 092 is connected to the second connecting pipe 092. The lower end of the second header 02 is communicated with the cavity portion 021 , so that the gas-liquid two-phase refrigerant can be evenly distributed through the second header 02 .

In the third chamber 032 and the second header 02 connected to both ends of the same connecting pipe 09 , the number of flat tubes connected to the third chamber 032 is smaller than the number of flat tubes 11 connected to the second header 02 . In the second embodiment, the number of flat tubes connected to the third chamber N1 is less than the number of flat tubes connected to the second header 02, and the number of flat tubes connected to the third chamber N2 is smaller than the number of flat tubes connected to the second header 02. , the number of flat tubes in the first process connected to the third chamber N3 is smaller than the number of flat tubes in the connected second process. The reason for such a design is the same as that for the design of the multi-layer partitions of the fourth header 04 in the first embodiment, which will not be repeated here.

Embodiment 3

In order to improve the heat exchange efficiency of the heat exchanger, a plurality of heat exchangers can be arranged in parallel communication. One of the purposes of the third embodiment is to improve the uniform distribution of the refrigerant between the two adjacent heat exchangers, so as to improve the overall Heat exchange uniformity of heat exchanger components.

17 to 19 , the heat exchanger includes a plurality of heat exchange parts 13 , and the plurality of heat exchange parts 13 are arranged in communication side by side, and the flat tubes 11 on two adjacent heat exchangers 13 are communicated through an intermediate header 05 .

The arrows in Figure 17 indicate the flow direction of the refrigerant when the heat exchanger is in the evaporating condition, the arrows in Figure 18 indicate the flow direction of the refrigerant when the heat exchanger is in the condensing condition, and Figure 19 shows the actual installation of multiple heat exchange parts Schematic diagram of the structure after.

In the third embodiment, the technical solution is explained by taking the heat exchanger having two heat exchange parts 13 as an example, and the two heat exchange parts 13 are defined as the first row of heat exchange parts 131 and the second row of heat exchange parts 132, and the second row of heat exchange parts 132. One row of heat exchange parts 131 is located in the downwind area of the air supply direction, and the second row of heat exchange parts 132 is located in the upwind area of the air supply direction. The flat tubes 11 and the fins 10 of the cloth, air flows through the gaps between the flat tubes 11 and the fins 10 to achieve the effect of heat exchange.

The two heat exchange parts are communicated through the intermediate header 05. The heat exchanger includes a first flow, a second flow, a third flow, and a fourth flow. The first flow and the fourth flow are located in the first row of heat exchange parts. 131, the second flow and the third flow are located on the second row of heat exchange parts 132, the flat tubes arranged in the first flow and the flat tubes arranged in the second flow are communicated through the intermediate header 05, The flat tubes in the third process and the flat tubes provided in the fourth process are communicated through the intermediate header 05 .

The arrangement of one end of the first row of heat exchange parts 131 may refer to the structural arrangement of the first embodiment shown in FIG. 2 , which will not be repeated here.

The arrangement of one end of the heat exchange portion 132 of the second row may refer to the structural arrangement of the second embodiment shown in FIG. 8 , which will not be repeated here.

Referring to Figure 17, when the heat exchanger is in the evaporating condition, the refrigerant enters the lower chamber 012 of the first header 01 through the separator 06, the gas distribution pipe group 07, and the liquid distribution pipe group 08, and then flows through the first header 01 in turn. The first flow, the intermediate header 05, and the second flow enter the third header 03, and then enter the second header 02 through the first connecting pipe 091 and the second connecting pipe 092, and then flow through the third flow, The middle header 05 and the fourth process flow into the upper chamber 011 of the first header 01 and finally flow out from the trachea group 12 .

Referring to FIG. 18 , when the heat exchanger is in the condensing condition, after the refrigerant enters the upper chamber 011 of the first header 01 through the gas pipe group 12, it flows through the fourth process, the intermediate header 05, and the third process in sequence. Enter the second header 02, and then enter the third header 03 through the first connecting pipe 091 and the second connecting pipe 092, and then flow through the second flow, the intermediate header 05, and the first flow into the first flow. In the lower chamber 012 of the header 01, it flows out through the gas distribution pipe group 07, the liquid distribution pipe group 08, and the separator 06 at last.

Regarding the number of flat tubes in each process, the number of flat tubes in the first process, the second process, the third process, and the fourth process gradually increases, that is, the number of flat tubes in the fourth process is greater than The number of flat tubes in the third process is greater than the number of flat tubes in the second process, and the number of flat tubes in the second process is greater than the number of flat tubes in the first process.

Inside the intermediate header 05, a plurality of sub-cavities 051 are formed through partition plates and arranged along the height direction of the intermediate header 05. The multiple sub-cavities 051 are independent of each other, and the structure of each sub-cavity 051 is the same, as shown in FIG. 20 . FIG. 27 is a schematic structural diagram of a single sub-cavity 051 , wherein FIG. 21 is a view viewed from the Q direction of FIG. 20 .

20 to 23 , each sub-cavity 051 includes a first cavity 052, a second cavity 053, a third cavity 054, a first circulation part 055, and a second circulation part 056. The first cavity 052 and Part of the flat tubes on the first row of heat exchange parts 131 are in communication, the second cavity 053 is in communication with part of the flat tubes on the second row of heat exchange parts 132, the third cavity 054 is in communication with the first cavity 052, and the first circulation The part 055 is located below the third cavity 054 and is used to communicate the second cavity 053 and the third cavity 054; the second flow part 056 is located above the second cavity 052 and is used to communicate the first cavity 052 and the Two cavities 053.

When the heat exchanger is used as an evaporator, the refrigerant first enters the first cavity 052, most of the refrigerant in the first cavity 052 will flow into the third cavity 054, and the gas-liquid two entering the third cavity 054 will flow into the third cavity 054. The phase refrigerant tends to be separated under the action of gravity and the uniformity becomes poor. The refrigerant in the third cavity 054 enters the second cavity 053 through the first circulation part 055 below. The flow rate of the phase refrigerant, when the gas phase refrigerant above the third cavity 054 flows downward through the first circulation part 055, it will be mixed with the liquid phase refrigerant below, and then the acceleration effect of the first circulation part 055 will enter the The second cavity 053 flows into the flat tube communicated with the second cavity 053 from bottom to top to achieve uniform distribution of the gas-liquid two-phase refrigerant in the flat tube. The speed of the refrigerant decreases during the bottom-to-up flow in the second cavity 053, a vortex is formed on the upper part of the second cavity 053, and the flow rate of the refrigerant in the flat tube is small at the vortex, and the second circulation part 056 will make the refrigerant The excess refrigerant in the upward process is introduced into the first cavity 052, mixed with the high-speed refrigerant in the first cavity 052, and participates in the distribution process of the next cycle, so as to further improve the uniform distribution of the refrigerant, thereby improving the The heat exchange effect of the air conditioner.

The diameter of the first circulation part 055 is preferably larger than the diameter of the flat tube 11 , so that the refrigerant in the third cavity 054 can smoothly enter the second cavity 053 through the first circulation part 055 .

The side walls of the first cavity 052 are provided with a plurality of first mounting portions 058 for mounting the flat tubes 11 , and the side walls of the second cavity 053 are provided with a plurality of second mounting portions 059 for mounting the flat tubes 11 . The first mounting portion 058 and the second mounting portion 059 are located on the same side of the sub-cavity 051, so that the first row of heat exchange portions 131 and the second row of heat exchange portions 132 can be formed side by side after being communicated through the intermediate header 05. The structure is more compact, which is beneficial to reduce the volume of the whole heat exchanger.

The first mounting portion 058 and the second mounting portion 059 may be insertion holes provided on the side wall of the sub-cavity 051, and the flat tube 11 may be directly inserted into the insertion holes, which is convenient for installation and has a reliable structure.

The number of the first mounting parts 058 and the second mounting parts 059 is the same, so that the number of flat tubes connected to the first cavity 052 is the same as the number of flat tubes connected to the second cavity 053, so as to improve the uniformity of the refrigerant in the flat tubes of different processes .

As a preferred embodiment, the sub-cavity 051 is provided with a first partition plate 0511, a second partition plate 0512, and a third partition plate 0513, and through the first partition plate 0511 and the second partition plate 0512 , and the third partition plate 0513 to divide the interior of the sub-cavity 051 into a first cavity 052 , a second cavity 053 and a third cavity 054 .

The second partition plate 0512 is preferably in the same plane as the third partition plate 0513, and the first partition plate 0511 is preferably perpendicular to the second partition plate 0512 and the third partition plate 0513, so as to form a second partition plate with equal volume A cavity 052 and a second cavity 053 in order to achieve uniform distribution of the refrigerant.

23, 25 to 27, the first partition plate 0511 is provided between the first cavity 052 and the second cavity 053, the second flow portion 056 is provided on the upper part of the first partition plate 0511, the second The partition plate 0512 is arranged between the first cavity 052 and the third cavity 054, the second partition plate 0512 is provided with a plurality of third circulation parts 057 for the refrigerant to circulate, and the third partition plate 0513 is arranged in the Between the second cavity 053 and the third cavity 054 , the first flow portion 055 is provided at the lower portion of the third partition plate 0513 .

When the heat exchanger is used as an evaporator, a plurality of flat tubes flow into the refrigerant in the first cavity 052, most of which enter the third cavity 054 through the third circulation part 057, and the refrigerant in the third cavity 054 passes through the lower part. The first circulation part 055 of the first circulation part 055 enters the second cavity 053, and the first circulation part 055 is arranged below, so that the gas-phase refrigerant above the third cavity 054 flows downward through the first circulation part 055. The liquid-phase refrigerant below is mixed, and then enters the second cavity 053 through the acceleration effect of the first circulation part 055, and flows into the flat tube communicated with the second cavity 053 from bottom to top to realize the gas-liquid two-phase refrigerant Even distribution in the flat tube. The speed of the refrigerant decreases during the bottom-to-up flow in the second cavity 053, and a vortex is formed in the upper part of the second cavity 053. The refrigerant flow rate of the flat tube at the vortex is small, and the second circulation part 056 located above will The excess refrigerant during the upward process of the refrigerant is introduced into the first cavity 052, mixed with the high-speed refrigerant in the first cavity 052, and participates in the distribution process of the next cycle, so as to further improve the uniform distribution of the refrigerant , thereby improving the heat exchange effect of the air conditioner.

The number of the third circulation parts 057 is preferably the same as the number of the flat tubes communicating with the first cavity 052, and there is a certain distance between the ends of the flat tubes located in the first cavity 052 and the third circulation part 057, and the For the third circulation portion 057 , most of the refrigerant injected from the flat tube can be injected into the third cavity 054 .

In addition, the sub-cavity 051 shown in FIGS. 20 to 23 is in the form of a rectangular structure. In other embodiments, the third cavity 054 may be in other structural forms such as D-type and O-type, which is not specifically limited in this embodiment. As shown in FIG. 24 , the third cavity 054 is D-shaped.

In the third embodiment, when the gas-liquid two-phase refrigerant circulates between the first row of heat exchange parts 131 and the second row of heat exchange parts 132, no matter whether the upstream refrigerant is split evenly, after passing through the intermediate header 05, it can be Ensure that the refrigerant entering the next process flat tube is dynamically regulated and evenly distributed.

In the foregoing description of the embodiments, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more of the embodiments or examples.

The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art who is familiar with the technical scope disclosed by the present utility model can easily think of changes or replacements. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. An air conditioner comprising:

the heat exchange loop is used for exchanging heat indoors and outdoors, and a heat exchanger is arranged on the heat exchange loop;

characterized in that the heat exchanger comprises:

a plurality of heat exchange portions arranged side by side, each heat exchange portion having a plurality of flat tubes through which a refrigerant flows;

the middle collecting pipe is communicated with the flat pipes on the two adjacent heat exchanging parts and is used for circulating and uniformly distributing the refrigerant;

wherein, the intermediate collecting main comprises:

a plurality of sub-cavities arranged along the height direction of the intermediate collecting pipe;

each of the sub-cavities comprises:

the first cavity is communicated with part of the flat tubes on one of the heat exchange parts and is used for circulating the refrigerant;

the second cavity is communicated with part of the flat tubes on the other heat exchange part and is used for circulating the refrigerant;

the third cavity is communicated with the first cavity and is used for circulating the refrigerant;

the first circulating part is positioned below the third cavity and is used for communicating the second cavity with the third cavity;

and the second circulating part is positioned above the second cavity and is used for communicating the first cavity with the second cavity.

2. The air conditioner according to claim 1,

a first mounting part for mounting the flat pipe is arranged on the side wall of the first cavity, and a second mounting part for mounting the flat pipe is arranged on the side wall of the second cavity;

the first installation part and the second installation part are located on the same side of the sub-cavity.

3. The air conditioner according to claim 2,

a first partition plate, a second partition plate and a third partition plate are arranged in the sub-cavities;

the first partition plate is arranged between the first cavity and the second cavity, and the second circulation part is arranged at the upper part of the first partition plate;

the second partition plate is arranged between the first cavity and the third cavity, and a plurality of third circulating parts for the circulation of the refrigerant are arranged on the second partition plate;

the third partition plate is arranged between the second cavity and the third cavity, and the first circulating part is arranged at the lower part of the third partition plate.

4. The air conditioner according to claim 3,

and a certain distance is reserved between the end part of the flat pipe positioned in the first cavity and the third circulation part, and the end part of the flat pipe is opposite to the third circulation part.

5. The air conditioner according to any one of claims 1 to 4,

the heat exchanger comprises a first heat exchanging part and a second heat exchanging part, the first heat exchanging part is positioned in a downwind area of the air supply direction, and the second heat exchanging part is positioned in an upwind area of the air supply direction;

the heat exchanger is provided with a first flow path, a second flow path, a third flow path and a fourth flow path, wherein the first flow path and the fourth flow path are positioned on the first heat exchanging part, and the second flow path and the third flow path are positioned on the second heat exchanging part;

the flat tubes arranged in the first flow and the flat tubes arranged in the second flow are communicated through the middle collecting pipe;

the flat pipes arranged in the third flow are communicated with the flat pipes arranged in the fourth flow through the middle collecting pipe.

6. The air conditioner according to claim 5,

the number of the flat tubes in the first flow, the second flow, the third flow, and the fourth flow is gradually increased.

7. The air conditioner according to claim 6,

and one end of the flat pipe arranged in the second flow is communicated with a third collecting pipe, one end of the flat pipe arranged in the third flow is communicated with a second collecting pipe, and the second collecting pipe is communicated with the third collecting pipe through a connecting pipe.

8. The air conditioner according to claim 7,

a cavity part, a plurality of channel parts uniformly distributed at intervals and a turbulent flow part arranged in the cavity part are formed in the second collecting pipe;

the cavity part is communicated with one end of the connecting pipe, one end of the channel part is communicated with the cavity part, and the other end of the channel part is communicated with the flat pipe arranged in the third flow.

9. The air conditioner according to claim 8,

the second collecting pipe is provided with at least one pipe;

a plurality of third partition plates are arranged in the third collecting pipe, the third partition plates divide the inner space of the third collecting pipe into a plurality of independent third chambers, one of the third chambers is simultaneously communicated with the flat pipes in the second flow and the flat pipes in the third flow, the number of the rest of the third chambers is the same as that of the second collecting pipe, and the rest of each third chamber is communicated with each second collecting pipe in a one-to-one correspondence manner through the connecting pipe.

10. The air conditioner according to claim 5,

one end of the first heat exchanging part is provided with a first collecting pipe, an upper chamber and a lower chamber for circulating refrigerants are formed in the first collecting pipe, the upper chamber is communicated with the flat pipe arranged in the fourth flow, and the lower chamber is communicated with the flat pipe arranged in the first flow;

the lower cavity is connected with a gas distributing pipe group and a liquid distributing pipe group, and the gas distributing pipe group and the liquid distributing pipe group are both connected with the separator;

the separator is used for separating gas-phase refrigerant and liquid-phase refrigerant, the gas-phase refrigerant enters the lower cavity through the gas-separating pipe group, and the liquid-phase refrigerant enters the lower cavity through the liquid-separating pipe group.

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