KR100422336B1 - Heating apparatus with low compression load - Google Patents

Abstract

The present invention relates to a low compression load type heating apparatus, and by changing a portion of the refrigerant flowing into the expander to a low temperature and low pressure by the auxiliary expander, it is possible to reduce the load of the compressor by bypassing the compressor.

As a configuration for this, the present invention, in a conventional heating device consisting of an outdoor unit, a compressor, an indoor unit and an expander, the refrigerant discharged from the indoor unit 140 passes through the heat exchange evaporation circuit 110 to the expander 120. A low compression load type, characterized in that a portion of the refrigerant introduced into the expander 120 is changed to a low temperature low pressure in the auxiliary expander 130 and then introduced into the compressor 150 through the heat exchange evaporation circuit 110. Provide heating.

Description

Heating apparatus with low compression load

The present invention relates to a low compression load type heating device, and more particularly, to reduce the load of the compressor by bypassing the compressor by changing a part of the refrigerant flowing into the expander to a low temperature low pressure by the auxiliary expander. Low compression load type heating device.

In general, the heating device is composed of an outdoor unit, a compressor, an indoor unit, and an expander. The heating unit takes heat away from the outside by using a phase change of the refrigerant and releases it into the room.

That is, the high temperature and high pressure gaseous refrigerant flows into the indoor unit to condense and release heat to the room, and the refrigerant discharged from the indoor unit expands to low temperature and low pressure in the expander and is discharged to the outdoor unit, and the outdoor unit flows into the cold While evaporating the refrigerant of the outdoor heat is taken out and discharged to the compressor, the compressor forms a cycle of compressing the refrigerant to high temperature and high pressure flow into the indoor unit.

However, the refrigerant flowing into the compressor of the conventional heating device is a state of superheated steam, which deteriorates the internal components of the compressor, thereby lowering the service life and depressing the compression efficiency.

The present invention has been made to solve such a conventional problem, the object of which is to reduce the load of the compressor by lowering the temperature of the refrigerant flowing into the compressor to increase the compression efficiency of the compressor and also the life of the internal components of the compressor It is to provide a low compression load type heating device that can be extended.

1 is a block diagram showing a first embodiment of a heating apparatus according to the present invention;

FIG. 2 is a sectional view showing an embodiment of the evaporation circuit for heat exchange of FIG. 1; FIG.

3 is a configuration diagram showing a modification to the first embodiment of the heating apparatus according to the present invention;

4 is a cross-sectional view showing an embodiment of the evaporation circuit for heat exchange of FIG.

5 is a configuration diagram showing a second embodiment of the heating apparatus according to the present invention;

6 is a configuration diagram showing a modification to the second embodiment of the heating apparatus according to the present invention;

7 is a configuration diagram showing a third embodiment of the heating apparatus according to the present invention;

8 is a configuration diagram showing a modification to the third embodiment of the heating apparatus according to the present invention;

9 is a block diagram showing a fourth embodiment of the heating apparatus according to the present invention;

10 is a configuration diagram showing a modification to the fourth embodiment of the heating apparatus according to the present invention; to be.

Explanation of symbols on the main parts of the drawings

110, 110 ', 210, 210', 310, 310 ', 410, 410': evaporation circuit

115, 115 ', 216, 216', 315, 315 ', 416, 416': bypass piping

120, 120 ', 220, 220', 320, 320 ', 420, 420': inflator

130, 130 ', 230, 230', 330, 330 ', 430, 430': auxiliary expander

140, 140 ', 240, 240', 340, 340 ', 440, 440': Indoor unit

150, 150 ', 250, 250', 350, 350 ', 450, 450': compressor

160, 160 ', 260, 260', 360, 360 ', 460, 460': outdoor unit

As a technical configuration for achieving the above object, the present invention, in a conventional heating device consisting of an outdoor unit, a compressor, an indoor unit and an expander, the refrigerant discharged from the indoor unit is introduced into the expander through a heat exchange evaporation circuit, the expander Part of the refrigerant flowing into the low-pressure low pressure in the expansion expander after the low heat load type heating device, characterized in that the flow through the evaporation circuit for heat exchange into the compressor.

In addition, the present invention, in a conventional heating device consisting of an outdoor unit, a compressor, an indoor unit and an expander, the refrigerant discharged from the indoor unit is introduced into the expander through a heat exchange evaporation circuit, a portion of the refrigerant introduced into the expander The low-compression load heating device is characterized in that the low-pressure low pressure in the auxiliary expander, the refrigerant discharged from the auxiliary expander and the refrigerant discharged from the outdoor unit flows into the compressor through the heat exchange evaporation circuit.

In addition, the present invention, in a conventional heating device consisting of an outdoor unit, a compressor, an indoor unit and an expander, the refrigerant discharged from the indoor unit is introduced into the expander through a heat exchange evaporation circuit, a portion of the refrigerant introduced into the expander A low compression load type heating device is provided, characterized by changing from an auxiliary expander to a low temperature and a low pressure, wherein a refrigerant discharged from the auxiliary expander and passed through a heat exchange evaporation circuit and a refrigerant discharged from the outdoor unit and heat exchanged in an expander flow into the compressor. By

In addition, the present invention, in a conventional heating device consisting of an outdoor unit, a compressor, an indoor unit and an expander, the refrigerant discharged from the indoor unit is introduced into the expander through a heat exchange evaporation circuit, a portion of the refrigerant introduced into the expander The low-compression load heating device is characterized in that the sub-expander changes to low temperature and low pressure, and the refrigerant discharged from the sub-expander and the refrigerant discharged from the outdoor unit and heat-exchanged in the expander flow into the compressor through the heat exchange evaporation circuit. By provision.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a first embodiment of a low compression load type heating apparatus according to the present invention, the heating apparatus 100 is a conventional expander 120, the refrigerant discharged from the expander 120 The outdoor unit 160 that receives and evaporates, a compressor 150 that receives and compresses the refrigerant discharged from the outdoor unit 160, and an indoor unit 140 that receives and condenses the refrigerant discharged from the compressor 150.

A heat exchange evaporation circuit 110 is disposed between the indoor unit 140 and the expander 120, and the heat exchange evaporation circuit 110 receives the refrigerant discharged from the indoor unit 140 and discharges it to the expander 120. The first refrigerant inlet 111 and the first refrigerant outlet 113 are formed. A pipe 116 connecting the first refrigerant discharge port 113 of the heat exchange evaporation circuit 110 and the expander 120 is branched into the main pipe 117 and the bypass pipe 115, whereby the heat exchange A portion of the refrigerant discharged from the evaporation circuit 110, for example, 50% of the refrigerant flows into the expander 120 through the main pipe 117 and the remainder flows into the auxiliary expander 130 through the bypass pipe 115. do. The refrigerant of the auxiliary expander 130 is introduced through the second refrigerant inlet 112 of the heat exchange evaporation circuit 110 to be discharged through the second refrigerant outlet 114, and the second refrigerant outlet 114 is discharged through the second refrigerant outlet 114. The refrigerant discharged through is introduced into the compressor 150 together with the refrigerant discharged from the outdoor unit 160.

The auxiliary expander 130 has a structure similar to that of the expander 120, which means that the pressure of the refrigerant discharged from the auxiliary expander 130 is equal to or similar to the pressure of the refrigerant discharged from the expander 120. Therefore, the high temperature and high pressure refrigerant flowing into the first refrigerant inlet 111 of the heat exchange evaporation circuit 110 and the low temperature low pressure refrigerant flowing into the second refrigerant inlet 112 exchange heat with each other. The high pressure refrigerant lowered to a predetermined temperature is discharged and the low pressure refrigerant increased to a predetermined temperature is discharged through the second refrigerant outlet 114.

The structure of the heat exchange evaporation circuit 110 can be formed in various ways, the example of which is shown in FIG. It provides a housing (110a) having a hollow portion (110b), the first refrigerant inlet 111 and the first refrigerant discharge port 113 formed on one side and the other side of the housing (110a) to each of the pipes (111a) Connecting the indoor unit 140 and the expander 120 via the (116), the first refrigerant inlet 111 and the first refrigerant outlet 113 is connected by a coil pipe (119), the housing ( A second refrigerant outlet 114 is formed at the side of the first refrigerant inlet 111 of 110a), and a second refrigerant inlet 112 is formed at the side of the first refrigerant outlet 113, and pipes 114a and 112a are respectively formed on the first refrigerant outlet 111. Has a structure in which the compressor 150 and the auxiliary expander 130 are connected to each other. That is, while the refrigerant introduced through the second refrigerant inlet 112 contacts the outer surface of the coil pipe 119, the refrigerant flowing through the coil pipe 119 may be exchanged with each other.

Looking at the state of the coolant for the case of using the heating device 100 of the present invention having the configuration of the first embodiment, that is, the temperature of the inlet and outlet coolant for each component, first in the indoor unit 140 The refrigerant discharged at 25 ° C. is cooled to 5 ° C. while passing through the evaporation circuit 110, and flows into the expander 120, and passes through the expander 120 to the outdoor unit 160 at a low temperature and low pressure of −15 ° C. Inflow, the temperature rises to 10 ℃ while passing through the outdoor unit (160). In addition, some of the refrigerant at 5 ° C. discharged from the evaporation circuit 110 flows into the auxiliary expander 130 through the bypass pipe 115, and the refrigerant has a low temperature and low pressure of −15 ° C. in the auxiliary expander 130. It is introduced into the evaporation circuit 110 in a state, the temperature is raised to 0 ℃ while passing through the evaporation circuit (110). Accordingly, the compressor 150 is mixed with the refrigerant having a temperature of 0 ° C discharged through the second refrigerant outlet 114 of the evaporation circuit 110 and the refrigerant having a temperature of 10 ° C discharged through the outdoor unit 160, thereby causing 0 ° C and 10 ° C. The refrigerant is introduced into the compressor compressor 150 having a temperature between the compressor 150 compresses the refrigerant having a lower temperature than the conventional one, and thus prevents a decrease in life due to deterioration of components constituting the compressor and an improvement in compression efficiency. Make it possible.

Figure 3 is a modification of the first embodiment of the present invention shown in Figure 1, the heater 100 'is substantially similar to the heating device 100 of Figure 1, except that the heat exchange evaporation circuit 110 'consists of a plurality of evaporation circuits 110A and 110B disposed in series or in parallel with respect to the refrigerant path, and expander 120' includes a plurality of expanders 120A disposed in series or in parallel with respect to the refrigerant path. 120B), the compressor 150 'is composed of two stage compressors 150A and 150B, and the auxiliary expander 130' is arranged in series or in parallel with respect to the refrigerant path. 130A) 130B.

This forms a first refrigerant inlet 111 'and a second refrigerant outlet 114' in the evaporation circuit 110A adjacent to the indoor unit 140 'and a second in the evaporator circuit 110B adjacent to the expander 120'. A refrigerant inlet 112 ′ and a first refrigerant outlet 113 ′ are formed, and a portion of the refrigerant discharged from the first refrigerant outlet 113 ′ is passed through the bypass pipe 115 ′ to the auxiliary expander 130 ′. The refrigerant is discharged from the auxiliary expander (130 ') is discharged to the second refrigerant outlet (114') through the evaporation circuit (110 ') through the second refrigerant inlet (112'). In addition, the compressor 150A receives the refrigerant discharged from the outdoor unit 160 'and the refrigerant discharged through the second refrigerant discharge port 114' and is connected to the compressor 150A and the compressor 150A in two stages. It is discharged to the indoor unit 140 'via 150B.

An embodiment of the evaporation circuit 110 'is shown in FIG. 4, which is one evaporation circuit 110A having a hollow housing 110A' and the other having a hollow housing 110B '. The evaporation circuit 110B is connected to the connection pipe 110C, and the indoor unit 140 via the pipe 111a 'to the first refrigerant inlet 111' formed at one side of the evaporation circuit 110 'is connected. ') Is connected and the expander 120' is connected to the first refrigerant outlet 113 'formed at the other side via the pipe 116'. In addition, a second refrigerant outlet 114 'is formed in the housing 110A' of the evaporation circuit 110A in which the first refrigerant inlet 111 'is formed, so that the compressor 150' is connected to the pipe 114a '. A second refrigerant inlet 112 ′ is formed in the housing 110B ′ of the evaporation circuit 110B in which the first refrigerant outlet 113 ′ is connected to the auxiliary expander 130 ′. Connected. The first refrigerant inlet 111 ′ and the first refrigerant outlet 113 ′ are coiled pipes 119A and 119B disposed inside the respective housings 110A ′ and 110B ′ and coiled pipes thereof. (119A) and 119B are connected by a connecting pipe 118 'disposed inside the connecting pipe 110C.

Of course, in the case of the present heating device 100 ′ having such a configuration, the compressor 150 ′ composed of a plurality of evaporation circuits 110 ′, an expander 120 ′, an auxiliary expander 130 ′, and two stages is provided. It is possible to further increase the heat exchange, expansion and compression capacity for the refrigerant, which not only allows for an increase in the capacity of the heating device 100 'but also reduces the load on the respective components.

Figure 5 is a block diagram showing a second embodiment of a low compression load type heating apparatus according to the present invention, the heating device 200 is a conventional expander 220, the refrigerant discharged from the expander 220 The outdoor unit 260 that receives and evaporates, a compressor 250 that receives and compresses the refrigerant discharged from the outdoor unit 260, and an indoor unit 240 that receives and condenses the refrigerant discharged from the compressor 250.

The heat exchange evaporation circuit 210 is disposed between the indoor unit 240 and the expander 220, and the heat exchange evaporation circuit 210 receives the refrigerant discharged from the indoor unit 240 and discharges it to the expander 220. The first refrigerant inlet 211 and the first refrigerant outlet 214 are formed. The bypass pipe 216 is branched from the pipe 217 connecting the first refrigerant discharge port 214 and the expander 220 of the heat exchange evaporation circuit 210, whereby the heat exchange evaporation circuit 210. Part of the refrigerant discharged from the inlet is introduced into the expander 220, the remainder is introduced into the auxiliary expander 230 through the bypass pipe 216. The refrigerant of the auxiliary expander 230 is introduced through the second refrigerant inlet 212 formed in the heat exchange evaporation circuit 210, and the refrigerant of the outdoor unit 260 is formed in the heat exchange evaporation circuit 210. Refrigerant introduced through the first refrigerant inlet 211 in a state that the refrigerant introduced through the third refrigerant inlet 212 and the third refrigerant inlet 213 is mixed through the third refrigerant inlet 213 and After the heat exchange in the evaporation circuit 210 is introduced into the compressor 250 through the second refrigerant outlet 215.

The auxiliary expander 230 is similar in structure to the expander 220, which means that the pressure of the refrigerant discharged from the auxiliary expander 230 is the same or similar to the pressure of the refrigerant discharged from the expander 220, Therefore, the high temperature high pressure refrigerant flowing into the first refrigerant inlet 211 of the heat exchange evaporation circuit 210 and the low temperature low pressure and the medium temperature low pressure refrigerant introduced through the second refrigerant inlet 212 and the third refrigerant inlet 213. By heat exchange with each other, the high pressure refrigerant lowered to a predetermined temperature is discharged through the first refrigerant outlet 214, and the low pressure refrigerant having a predetermined temperature is discharged through the second refrigerant outlet 215.

The structure of the heat exchange evaporation circuit 210 may be variously formed, which has been described with reference to FIG. 2 showing an embodiment of the evaporation circuit 110 according to the first embodiment of the present invention. The description thereof will be omitted. However, the refrigerant introduced through the second refrigerant inlet 212 and the third refrigerant inlet 212 may be mixed with each other and discharged through the second refrigerant outlet 215.

Looking at the state of the refrigerant, that is, the temperature of the inlet and outlet side refrigerant for each component in the case of using the heating device 200 of the present invention having the configuration of the second embodiment described above, first in the indoor unit 240 The refrigerant discharged at 25 ° C. is cooled to 5 ° C. while passing through the evaporation circuit 210, and flows into the expander 220. The coolant discharged to 25 ° C. goes to the outdoor unit 260 at a low temperature and low pressure of −15 ° C. while passing through the expander 220. It is introduced and heated up to 10 ° C. while passing through the outdoor unit 260. In addition, a portion of the refrigerant at 5 ° C discharged from the evaporation circuit 210 is introduced into the auxiliary expander 230 through the bypass pipe 216 and evaporated in the auxiliary expander 230 at a low temperature of -15 ° C. At the same time as flowing into the circuit 210, the refrigerant of 10 ° C discharged from the outdoor unit 260 is introduced through the third refrigerant inlet 213 and mixed with the refrigerant of -15 ° C introduced from the auxiliary expander 230 While passing through the evaporation circuit 210, the refrigerant becomes a refrigerant having a predetermined temperature, for example, 5 ° C and is discharged to the compressor 250. Therefore, since the compressor 250 compresses the refrigerant having a lower temperature than the conventional one, it is possible to prevent the decrease in life due to the deterioration of the components constituting the compressor and to improve the compression efficiency.

6 is a modification of the second embodiment of the present invention shown in FIG. 5, wherein the heating device 200 'is substantially similar in structure to the heating device 200 of FIG. 210 'consists of a plurality of evaporation circuits 210A and 210B arranged in series or in parallel with respect to the refrigerant path, and expander 220' includes a plurality of expanders 220A arranged in series or in parallel with respect to the refrigerant path. 220B), the compressor 250 'is composed of two stage compressors 250A and 250B, and the auxiliary expander 230' is arranged in series or in parallel with respect to the refrigerant path. 230A) 230B.

This forms a first refrigerant inlet 211 'and a second refrigerant outlet 215' in the evaporator circuit 210A adjacent to the indoor unit 240 'and a second in the evaporator circuit 210B adjacent to the expander 220'. A refrigerant inlet 212 ′, a third refrigerant inlet 213 ′, and a first refrigerant outlet 214 ′ are formed, and a portion of the refrigerant discharged from the first refrigerant outlet 214 ′ is bypass pipe 216 ′. ) And enters the auxiliary expander 230 ′, and all of the refrigerant discharged from the outdoor unit 260 ′ is introduced into the evaporation circuit 210 ′ through the third refrigerant inlet 213 ′ and thus the auxiliary expander 230. ') Is discharged to the second refrigerant outlet 215' together with the refrigerant introduced into the evaporation circuit 210 'through the second refrigerant inlet (212'). In addition, a refrigerant discharged from the second refrigerant outlet 215 'flows into the compressor 250A' and passes through the compressor 250A 'and a compressor 250B' connected in two stages to the compressor 250A '. To 260 '.

The detailed structure of the evaporation circuit 210 'is omitted, which is substantially similar in structure to the evaporation circuit 110' of the first embodiment shown in FIG. 4, except that it is a second refrigerant inlet 212 '. When the introduced refrigerant and the refrigerant introduced into the third refrigerant inlet 213 'are heat exchanged in the evaporation circuit 210' in a mixed state, the refrigerant is introduced into the compressor 250 'through the second refrigerant outlet 215'. do.

Of course, in the case of the present heating device 200 ′ having such a configuration, the compressor 250 ′ composed of a plurality of evaporation circuits 210 ′, an expander 220 ′, an auxiliary expander 230 ′, and two stages is provided. It is possible to further increase the heat exchange, expansion and compression capacity for the refrigerant, which not only enables an increase in the capacity of the heating device 200 'but also reduces the load on the respective components.

7 is a block diagram showing a third embodiment of a low compression load type heating apparatus according to the present invention. The heating apparatus 300 includes a conventional expander 320 and refrigerant discharged from the expander 320. The outdoor unit 360 which receives and evaporates, the compressor 350 which receives and compresses the refrigerant discharged from the outdoor unit 360, and the indoor unit 340 which receives and condenses the refrigerant discharged from the compressor 350.

A heat exchange evaporation circuit 310 is disposed between the indoor unit 340 and the expander 320, and the heat exchange evaporation circuit 310 receives the refrigerant discharged from the indoor unit 340 and discharges it to the expander 320. The first refrigerant inlet 311 and the first refrigerant outlet 313 are formed. The pipe 316 connecting the first refrigerant discharge port 313 and the expander 320 of the heat exchange evaporation circuit 310 is branched into the main pipe 317 and the bypass pipe 315, thereby A portion of the refrigerant discharged from the evaporation circuit 310 is introduced into the expander 320 through the main pipe 317 and the remainder is introduced into the auxiliary expander 330 through the bypass pipe 315. The refrigerant of the auxiliary expander 330 is introduced through the second refrigerant inlet 312 of the heat exchange evaporation circuit 310 and discharged through the second refrigerant outlet 314.

The auxiliary expander 330 has a structure similar to that of a conventional expander, which means that the pressure of the refrigerant discharged from the auxiliary expander 330 is equal to or similar to the pressure of the refrigerant discharged from the expander 320. The high temperature and high pressure refrigerant flowing into the first refrigerant inlet 311 of the heat exchange evaporation circuit 310 and the low temperature low pressure refrigerant flowing into the second refrigerant inlet 312 are exchanged with each other through the first refrigerant outlet 313. The high pressure refrigerant lowered to a predetermined temperature is discharged and the low pressure refrigerant increased to a predetermined temperature is discharged through the second refrigerant discharge port 314.

The heat exchange evaporation circuit 310 may have various structures, and a detailed description thereof will be omitted. And, it can be configured in a form similar to the structure of the heat exchange evaporation circuit 110 for the first embodiment of the present invention shown in FIG.

The expander 320 allows the refrigerant introduced into the main pipe 317 to expand into a state of low temperature and low pressure, and then flows into the outdoor unit 360. The expander 320 further includes another refrigerant inlet 321 and a refrigerant outlet ( 322 is formed to allow all of the refrigerant discharged from the outdoor unit 360 through the refrigerant inlet 321 to be discharged through the refrigerant outlet 322, which means that heat exchange occurs in the expander 320. . In addition, an illustration of the detailed structure of the expander 320 is omitted, which is an expansion valve (not shown) which causes the refrigerant introduced into the main pipe 317 to expand inside the expander 320 and is discharged toward the outdoor unit 360. ) And a housing (not shown) configured to surround the expansion valve, and a coolant inlet 321 and a coolant outlet 322 are formed in the lower housing so that the refrigerant introduced through the coolant inlet 321 is formed in the expansion valve. After the heat exchange is made by contacting the outer surface has a conventional structure that is discharged to the refrigerant discharge port (322).

The refrigerant discharged through the refrigerant discharge port 322 of the expander 320 and the refrigerant discharged through the second refrigerant discharge port 314 of the heat exchange evaporation circuit 310 are mixed and introduced into the compressor 350. .

Looking at the state of the coolant for the case of using the heating device 300 of the present invention having the configuration of the third embodiment, that is, the temperature of the inlet and outlet coolant for each component, first in the indoor unit 340 The refrigerant discharged at 25 ° C. is cooled to 5 ° C. while passing through the evaporation circuit 310 to be introduced into the expander 320, and passes through the expander 320 to the outdoor unit 360 at a low temperature and low pressure of −15 ° C. Inflow, the temperature rises to 10 ℃ while passing through the outdoor unit (360). In addition, a part of the refrigerant at 5 ° C. discharged from the evaporation circuit 310 flows into the auxiliary expander 330 through the bypass pipe 315, and at the low temperature and low pressure of −15 ° C. in the auxiliary expander 330. It is introduced into the evaporation circuit 310, the temperature is raised to 0 ℃ while passing through the evaporation circuit (310). In addition, the 10 ° C. refrigerant discharged from the outdoor unit 360 is heated to 15 ° C. while passing through the expander 320. Therefore, the compressor 350 mixes the refrigerant at 0 ° C discharged through the second refrigerant discharge port 314 of the evaporation circuit 310 and the refrigerant at 15 ° C discharged through the refrigerant discharge port 322 of the expander 320. The refrigerant is introduced into the compressor 350 at about 5 ° C., which compresses the refrigerant having a lower temperature than that of the related art, and thus prevents degradation of life due to deterioration of components constituting the compressor and compression efficiency. Enable improvement.

FIG. 8 is a modification of the third embodiment of the present invention shown in FIG. 7, wherein the heating device 300 'is substantially similar in configuration to the heating device 300 of FIG. Numerals 310 'are composed of a plurality of evaporation circuits 310A and 310B arranged in series or in parallel with respect to the refrigerant path and inflators 320' are arranged in series or in parallel with respect to the refrigerant path. 320B), the compressor 350 'is composed of two stage compressors 350A and 350B, and the auxiliary expander 330' is disposed in series or in parallel with respect to the refrigerant path. It is characterized by consisting of 330A (330B).

This forms a first refrigerant inlet 311 'and a second refrigerant outlet 314' in the evaporation circuit 310A adjacent to the indoor unit 340 'and a second in the evaporator circuit 310B adjacent to the expander 320'. A refrigerant inlet 312 ′ and a first refrigerant outlet 313 ′ are formed, and a part of the refrigerant discharged from the first refrigerant outlet 313 ′ is passed through the bypass pipe 315 ′ through the auxiliary expander 330 ′. The refrigerant is discharged from the auxiliary expander (330 ') is discharged to the second refrigerant discharge port (314') through the evaporation circuit 310 'through the second refrigerant inlet (312'). In addition, the compressor 350A and the refrigerant discharged from the expander 320'and the refrigerant discharged through the second refrigerant outlet 314 'of the evaporation circuit 310' are introduced to the compressor 350A and the compressor 350A. ) Is discharged to the outdoor unit 360 'via a compressor 350B connected in two stages.

The detailed structure of the evaporation circuit 310 'will be omitted.

Of course, in the case of the present heating device 300 'having such a configuration, the compressor 350' composed of a plurality of evaporation circuits 310 ', an expander 320', an auxiliary expander 330 'and two stages is provided. The heat exchange, expansion and compression capacity for the refrigerant can be further increased, which not only allows for increased capacity of the heating device 300 'but also can reduce the load on the respective components.

9 is a block diagram showing a fourth embodiment of a low compression load type heating apparatus according to the present invention. The heating apparatus 400 includes a conventional expander 420 and refrigerant discharged from the expander 420. The outdoor unit 460 which receives and evaporates, the compressor 450 which receives and compresses the refrigerant discharged from the outdoor unit 460, and the indoor unit 440 which receives and condenses the refrigerant discharged from the compressor 450.

A heat exchange evaporation circuit 410 is disposed between the indoor unit 440 and the expander 420, and the heat exchange evaporation circuit 410 receives the refrigerant discharged from the indoor unit 440 and discharges it to the expander 420. The first refrigerant inlet 411 and the first refrigerant outlet 414 are formed. The bypass pipe 416 is branched from the pipe 417 connecting the first refrigerant discharge port 414 and the expander 420 of the heat exchange evaporation circuit 410, whereby the heat exchange evaporation circuit 410. A portion of the refrigerant discharged from the inlet is introduced into the expander 420 and the rest is introduced into the auxiliary expander 430 through the bypass pipe 416. The refrigerant of the auxiliary expander 430 flows into the evaporation circuit 410 through the second refrigerant inlet 412 of the heat exchange evaporation circuit 410.

The auxiliary expander 430 has a structure similar to that of a conventional expander, which means that the pressure of the refrigerant discharged from the auxiliary expander 430 is equal to or similar to the pressure of the refrigerant discharged from the expander 420. The refrigerant of high temperature and high pressure introduced into the first refrigerant inlet 411 of the heat exchange evaporation circuit 410 and the refrigerant of low temperature and medium temperature low pressure introduced through the second refrigerant inlet 412 and the third refrigerant inlet 413 are mutually different. By the heat exchange, the high pressure refrigerant lowered to a predetermined temperature is discharged through the first refrigerant outlet 414, and the low pressure refrigerant having a predetermined temperature is discharged through the second refrigerant outlet 415.

The structure of the heat exchange evaporation circuit 410 can be formed in various ways, which has been described in FIG. 2 showing an embodiment of the evaporation circuit 110 according to the first embodiment of the present invention. The description thereof will be omitted. However, the refrigerant flowing through the second refrigerant inlet 413 and the third refrigerant inlet 414 may be mixed with each other and discharged through the second refrigerant outlet 415.

The expander 420 expands the refrigerant introduced through the main pipe 417 to a state of low temperature and low pressure so that the expander 420 flows into the outdoor unit 460. Further, the expander 420 has another refrigerant inlet 421 and a refrigerant outlet ( 422 is formed to allow all of the refrigerant discharged from the outdoor unit 460 through the refrigerant inlet 421 to be discharged through the refrigerant outlet 422, which means that heat exchange occurs in the expander 420. . Detailed description of the structure of the inflator 420 will be omitted.

In addition, the refrigerant discharged from the auxiliary expander 430 and introduced through the second refrigerant inlet 412 of the evaporator circuit 410 and the refrigerant discharge port 422 of the expander 420 are discharged from the evaporator circuit 410. The refrigerant introduced through the third refrigerant inlet 413 is heat-exchanged with the refrigerant introduced through the first refrigerant inlet 411 in the evaporation circuit 410, and then is discharged through the second refrigerant outlet 414 to be discharged through the compressor 450. Flows into).

Looking at the state of the coolant for the case of using the heating device 400 of the present invention having the configuration of the fourth embodiment, that is, the temperature of the inlet and discharge side refrigerant for each component, first in the indoor unit 440 The refrigerant discharged at 25 ° C. is cooled to 5 ° C. while passing through the evaporation circuit 410, and flows into the expander 420, and passes through the expander 420 to the outdoor unit 460 at a low temperature and low pressure of −15 ° C. It is introduced and heated to 10 ° C. while passing through the outdoor unit 460. In addition, a part of the refrigerant at 5 ° C. discharged from the evaporation circuit 410 flows into the auxiliary expander 430 through the bypass pipe 416 and evaporates from the auxiliary expander 430 to a low temperature and low pressure of −15 ° C. At the same time as flowing into the circuit 410, the refrigerant of 10 ° C discharged from the outdoor unit 460 is heated to 15 ° C while passing through the expander 420. The refrigerant at 15 ° C. introduced through the expander 420 and the refrigerant at −15 ° C. introduced from the auxiliary expander 430 are mixed and passed through an evaporation circuit 410, and the refrigerant at a predetermined temperature, for example, 7 ° C.-10 ° C. To be introduced into the compressor 450. Therefore, since the compressor 450 compresses the refrigerant having a lower temperature than the conventional one, it is possible to prevent a decrease in life due to deterioration of the components constituting the compressor and to improve the compression efficiency.

FIG. 10 is a modification of the fourth embodiment of the present invention shown in FIG. 9, wherein the heating device 400 'is substantially similar to the heating device 400 of FIG. 410 'consists of a plurality of evaporation circuits 410A and 410B disposed in series or in parallel with respect to the refrigerant path, and expander 420' includes a plurality of expanders 420A disposed in series or in parallel with respect to the refrigerant path. 420B, the compressor 450 'is composed of two stage compressors 450A and 450B, and the auxiliary expander 430' is arranged in series or parallel to the refrigerant path. It is characterized by consisting of (430A) (430B).

This forms a first refrigerant inlet 411 'and a second refrigerant outlet 415' in the evaporator circuit 410A adjacent to the indoor unit 440 'and a second in the evaporator circuit 410B adjacent to the expander 420'. A refrigerant inlet 412 ', a third refrigerant inlet 413', and a first refrigerant outlet 414 'are formed, and a part of the refrigerant discharged from the first refrigerant outlet 414' is bypass pipe 415 '. ) Is introduced into the auxiliary expander (430 '), and all of the refrigerant discharged from the outdoor unit (460') flows into the evaporation circuit (410 ') through the third refrigerant inlet (413') via the expander (420). And discharged from the auxiliary expander 430 'and discharged to the second refrigerant outlet 415' together with the refrigerant introduced into the evaporation circuit 410 'through the second refrigerant inlet 412'. In addition, a refrigerant discharged from the second refrigerant outlet 415 'flows into the compressor 450A' and passes through the compressor 450A 'and a compressor 450B' connected in two stages to the compressor 450A '. To 440 '.

The detailed structure of the evaporation circuit 410 'is omitted, which is substantially similar in structure to the evaporation circuit 110' of the first embodiment shown in FIG. 4, except that it has a second refrigerant inlet 412 '. After the heat exchanged in the evaporation circuit 410 'in a state where the introduced refrigerant and the refrigerant introduced into the third refrigerant inlet 413' are mixed, the refrigerant flows into the compressor 450 'through the second refrigerant outlet 415'. .

Of course, in the case of the present heating device 400 ′ having such a configuration, the compressor 450 ′ composed of a plurality of evaporation circuits 410 ′, an expander 420 ′, an auxiliary expander 430 ′, and two stages is provided. It is possible to further increase the heat exchange, expansion and compression capacity for the refrigerant, which not only enables an increase in the capacity of the heating device 400 'but also reduces the load on the respective components.

As described above, the low compression load type heating apparatus according to the present invention has the effect of reducing the compression load of the compressor by lowering the temperature of the refrigerant flowing into the compressor.

Claims (16)

delete delete delete delete In a conventional heating device consisting of an outdoor unit, a compressor, an indoor unit, and an expander, The refrigerant discharged from the indoor unit 240 is introduced into the expander 220 through the heat exchange evaporation circuit 210, and a part of the refrigerant flowing into the expander 220 is changed from the auxiliary expander 230 to low temperature low pressure. And the refrigerant discharged from the auxiliary expander (230) and the refrigerant discharged from the outdoor unit (260) flow into the compressor (250) through the heat exchange evaporation circuit (210). The low compression load type heating apparatus according to claim 5, wherein a plurality of heat exchange evaporation circuits are installed. The low compression load type heating apparatus according to claim 5, wherein a plurality of expanders are installed. The low compression load type heating apparatus according to claim 5, wherein the compressor is a two-stage compressor. In a conventional heating device consisting of an outdoor unit, a compressor, an indoor unit, and an expander, The refrigerant discharged from the indoor unit 340 is introduced into the expander 320 through the heat exchange evaporation circuit 310, and a part of the refrigerant introduced into the expander 320 is changed from the auxiliary expander 330 to low temperature low pressure. And a refrigerant discharged from the auxiliary expander 330 and passed through the heat exchange evaporation circuit 310 and discharged from the outdoor unit 360 to be heat exchanged in the expander 320 to the compressor 350. Low compression load type heating system. The low compression load type heating apparatus according to claim 9, wherein a plurality of heat exchange evaporation circuits are installed. The low compression load type heating apparatus according to claim 9, wherein a plurality of expanders are installed. 10. The low compression load type heating apparatus according to claim 9, wherein the compressor is a two-stage compressor. In a conventional heating device consisting of an outdoor unit, a compressor, an indoor unit, and an expander, The refrigerant discharged from the indoor unit 440 is introduced into the expander 420 through the heat exchange evaporation circuit 410, and a part of the refrigerant flowing into the expander 420 is changed from the auxiliary expander 430 to low temperature low pressure. The refrigerant discharged from the auxiliary expander 430 and the refrigerant discharged from the outdoor unit 460 and heat-exchanged in the expander 420 flow into the compressor 450 through the heat exchange evaporation circuit 410. Low compression load type heating system. The low compression load type heating apparatus according to claim 13, wherein a plurality of heat exchange evaporation circuits are installed. The low compression load type heating apparatus according to claim 13, wherein a plurality of expanders are installed. The low compression load type heating apparatus according to claim 13, wherein the compressor is a two-stage compressor.