CN109000389B - Condenser and refrigeration system provided with same - Google Patents

Abstract

The present invention relates to a condenser used in a refrigeration system including a plurality of refrigeration cycle circuits for a plurality of rooms, respectively, and a refrigeration system including the condenser; the condenser is composed of mutually independent condenser cores with a plurality of overlapped radiating surfaces in the projection direction, each condenser core is divided into a plurality of independent parts in the radiating surface direction, each independent part in a single condenser core is connected to different refrigeration circulation loops, and the parts of the condenser cores connected to the same refrigeration circulation loop are arranged in series in the refrigeration circulation loop. According to the present invention, the maximization of the condenser capacity in each refrigeration cycle circuit and the homogenization of the refrigeration capacity of each refrigeration cycle circuit can be achieved.

Description

Condenser and refrigeration system provided with same

Technical Field

The invention relates to the technical field of refrigeration, in particular to a condenser and a refrigeration system with the same.

Background

The use of refrigerated transport vehicles for transporting frozen or fresh goods has become very popular. A refrigerating machine for a refrigerated transport vehicle generally includes an outdoor unit and an indoor unit, the indoor unit mainly includes an evaporator module and the like, and one outdoor unit is currently provided with a refrigeration cycle.

In a conventional S/E (independent engine) refrigerator, when an engine is Operated (ON) and a motor is continuously operated, a compressor cannot be stopped (OFF), and thus, a cooling-warming-cooling-warming state is repeatedly performed. In the case where the refrigerator has a plurality of refrigerating chambers and a plurality of evaporators, a three-way valve or the like needs to be attached to a condenser in the outdoor unit, that is, a refrigeration cycle circuit needs to be branched.

As shown in fig. 1, when a plurality of freezing and refrigerating compartments are used in a refrigerated transport vehicle, the temperature ranges of the freezing and refrigerating compartments are generally different from each other, and when the set temperature of one compartment is reached and the set temperature of the other compartment is not reached, it is necessary to constantly operate the outdoor unit (the compressor, the drive source engine, and the like). The room (assumed as the a room) having reached the set temperature is under the supercooling operation, while the other rooms deprive the freezing capacity of the a room, as a result, the entire freezing capacity cannot be exhibited, the temperature control cannot be performed independently, and the defrosting cannot be performed independently.

In order to avoid the above problem, if a heating function is provided in the indoor unit for the a-compartment, the set temperature can be maintained, but heating is performed simultaneously with the freezing operation, which causes an inefficient operation mode, that is, another problem.

On the other hand, when the temperature of the chamber a reaches the set temperature, it is possible to close only the indoor unit of the chamber a and continue the operation of the indoor units of the other chambers alone, but in order to ensure the reliability of the refrigeration cycle, it is necessary to add an electromagnetic valve, and there is another problem that the price increases and the refrigerator dedicated for multiple chambers and the product using only the refrigerator for single chamber cannot be used in common.

In addition, since a conventional vehicle refrigerator has only one refrigeration cycle in one outdoor unit, a single condenser core structure is adopted.

When a plurality of refrigerating chambers are used, the condensers are divided into an upstream side condenser and a downstream side condenser, and are mounted in parallel, which leads to a problem that the size of the outdoor unit is increased.

In addition, if a plurality of condenser cores are arranged in series, the downstream side condenser core sucks in high-temperature air affected by the upstream side condenser core, and the condenser capacity cannot be fully developed and the capacity of the plurality of condenser cores is reduced.

Disclosure of Invention

The invention aims to provide a condenser capable of maximizing the capacity of the condenser and a refrigeration system with the condenser.

The invention is realized by the following technical scheme:

in one aspect, the present invention provides a condenser for use in a refrigeration system including a plurality of refrigeration cycle circuits for a plurality of compartments, respectively;

the condenser is composed of mutually independent condenser cores with a plurality of overlapped radiating surfaces in the projection direction, each condenser core is divided into a plurality of mutually non-communicated independent parts in the radiating surface direction, each independent part in a single condenser core is respectively connected to different refrigeration circulation loops, and the parts of the plurality of condenser cores connected to the same refrigeration circulation loop are arranged in series in the refrigeration circulation loop.

According to the present invention, the maximization of the condenser capacity in each refrigeration cycle circuit and the homogenization of the refrigeration capacity of each refrigeration cycle circuit can be achieved.

Preferably, the refrigeration system comprises two refrigeration cycle circuits; the condenser consists of condenser cores which are mutually independent and have two radiating surfaces overlapped in the projection direction, and each condenser core is divided into a first part and a second part in the radiating surface direction in an up-down or left-right way; a refrigerant in the first refrigeration cycle flows in from one side of the first portion of the first condenser core and flows out from the one side of the first portion of the second condenser core; the refrigerant in the second refrigeration cycle flows in from the one side of the second portion of the first condenser core, and flows out from the one side of the second portion of the second condenser core.

Preferably, the first condenser core is located on an upstream side in a heat exchange air flow direction with respect to the second condenser core, and a first portion of the first condenser core overlaps with a first portion of the second condenser core in a heat radiation surface projection direction, and a second portion of the first condenser core overlaps with a second portion of the second condenser core in the heat radiation surface projection direction.

Optionally, the refrigeration system includes two refrigeration circulation loops; the condenser consists of condenser cores which are mutually independent and have two radiating surfaces overlapped in the projection direction, and each condenser core is divided into a first part and a second part in the radiating surface direction in an up-down or left-right way; the refrigerant in the first refrigeration cycle circuit flows in from one side of the first part of the first condenser core and flows out from one side of the second part of the second condenser core; the refrigerant in the second refrigeration cycle flows in from the one side of the second portion of the first condenser core, and flows out from the one side of the first portion of the second condenser core.

Preferably, the first condenser core is located on an upstream side in a flow direction of heat exchange air with respect to the second condenser core, and a first portion of the first condenser core and a second portion of the second condenser core are staggered in a projection direction of a heat radiating surface, and the second portion of the first condenser core and the first portion of the second condenser core are staggered in the projection direction of the heat radiating surface.

It is also possible that the refrigeration system comprises two refrigeration cycle circuits; the condenser consists of condenser cores which are mutually independent and have two radiating surfaces overlapped in the projection direction, and each condenser core is divided into a first part and a second part in the radiating surface direction in an up-down or left-right way; a refrigerant in the first refrigeration cycle flows in from one side of the first portion of the first condenser core and flows out from the one side of the first portion of the second condenser core; the refrigerant in the second refrigeration cycle flows in from the other side of the second portion of the first condenser core, and flows out from the other side of the second portion of the second condenser core.

In another aspect, the present invention further provides a refrigeration system including the condenser, wherein a plurality of refrigeration cycle circuits share one condenser.

Therefore, the number of components of the outdoor unit can be reduced, the cost is reduced, the space is saved, and the layout and the configuration of each component in the outdoor unit are facilitated.

Drawings

FIG. 1 is a schematic diagram showing a refrigerated transport vehicle having more than two compartments; wherein 1a is a refrigerated transport vehicle with a freezing chamber and a refrigerating chamber; 1b and 1c are both refrigerated transport vehicles with a freezing chamber, a refrigerating chamber and a normal temperature chamber;

fig. 2 is a schematic diagram showing a refrigeration cycle of the refrigeration system according to the embodiment of the present invention;

FIG. 3 is a schematic illustration of two condenser cores of a condenser according to one embodiment of the present invention;

FIG. 4 is a schematic view of a bracket connecting two condenser cores in a condenser according to one embodiment of the present invention;

FIG. 5 is a schematic view of the overall structure and the refrigerant flowing direction of a condenser according to another embodiment of the present invention;

FIG. 6 is a schematic view of the overall structure and the refrigerant flow direction of a condenser according to still another embodiment of the present invention;

fig. 7 is a schematic diagram showing a temperature condition when only one refrigeration cycle circuit is turned ON;

fig. 8 is a schematic view showing a condenser in the prior art.

Detailed Description

In order to optimally control a plurality of compartments having different temperatures, the present invention generally adopts a structure in which one outdoor unit is provided with a plurality of refrigeration cycle circuits.

FIG. 1 is a schematic view showing a refrigerated transport vehicle having a plurality of compartments with different temperature zones, wherein 1a is a refrigerated transport vehicle having one freezer compartment and one refrigerator compartment; 1b and 1c are refrigerated transport vehicles with a freezing chamber, a refrigerating chamber and a normal temperature chamber; an outdoor unit 1 is shown. Fig. 1 shows that a plurality of indoor units are required to be installed depending on the number of freezing and refrigerating chambers, but generally, one outdoor unit is provided and can be configured to correspond to a plurality of indoor units.

In the present invention, the condenser is used in a refrigeration system of a refrigerated transport vehicle, which includes a plurality of refrigeration cycle circuits for a plurality of compartments, respectively. The condenser consists of a plurality of condenser cores with mutually independent radiating surfaces overlapped in the projection direction, each condenser core is divided into a plurality of independent parts in the radiating surface direction, each independent part in a single condenser core is connected to different refrigeration circulation loops, and the parts of the condenser cores connected to the same refrigeration circulation loop are arranged in series in the refrigeration circulation loop.

The invention will be described in further detail below with reference to fig. 2-7, which illustrate a refrigeration system for a refrigerated transport vehicle having two compartments.

Fig. 2 is a schematic diagram showing a refrigeration cycle of a refrigeration system according to an embodiment of the present invention, in which two independent refrigeration cycles are shown, which may have independent operation modes. The two evaporator modules 7 are installed in the indoor units of the two rooms, respectively, and are disposed on two different refrigeration cycle circuits. The portion other than the evaporator module 7 is disposed in the outdoor unit 1.

As shown in fig. 2, the outdoor unit 1 includes: two compressors 5 respectively disposed in the two refrigeration cycle circuits, condensers 6 disposed in the two refrigeration cycle circuits and respectively communicated with the compressors 5 to cool the compressed refrigerant, and an engine for driving the two compressors 5. The outdoor unit 1 further includes other refrigeration components, such as an oil-liquid separator 8, a liquid receiver 9, and a liquid collector 10, which are respectively disposed in the two refrigeration cycle circuits. Each refrigeration cycle loop is also provided with an electromagnetic valve which is used for independently controlling the flow of the refrigerant in each refrigeration cycle loop. The evaporator module 7 in the indoor unit is in communication with the compressor 5 and the condenser 6 in the corresponding refrigeration cycle circuit, respectively.

The outdoor unit 1 of the refrigeration system according to an embodiment of the present invention further includes: the backup motor that can receive the supply of the external power supply to simultaneously drive the compressors 5 in the respective refrigeration cycle circuits when the vehicle is stopped. The backup motor is a power unit common to the plurality of refrigeration cycle circuits, like the engine, and is controlled by an ECU (electronic control unit) control device, for example. The standby motor 4 is also provided with an external power supply interface, and when the engine 2 stops running, the standby motor can be driven by the external power supply so as to drive the compressor 5 and the generator 3 to run. In this embodiment, the engine mode is provided in which the engine drives the compressor and the backup motor is driven by the belt, so that the generator connected to the backup motor is operated to supply power to the components other than the compressor; the vehicle is also provided with a standby power mode in which the standby motor receives the supply of an external power source to drive the compressor 5 when the vehicle is stopped.

Next, a refrigeration cycle of a refrigeration system according to an embodiment of the present invention will be described with reference to fig. 2. The compressor 5 compresses a refrigerant, the compressed refrigerant then enters the oil-liquid separator 8 for oil-liquid separation, and the separated liquid refrigerant enters the condenser 6 and is blown by the fan 11 for heat dissipation. A freezing valve disposed downstream of the condenser 6 controls opening and closing of the refrigerant passage. The receiver tank 9 is used for temporarily storing the refrigerant. The state of the refrigerant can be observed by the liquid observation mirror 12. The refrigerant then flows into the evaporator module 7 of the indoor unit, and the evaporator module 7 cools each chamber.

Because the independent refrigeration circulation loop is provided, the independent control can be carried out according to the set temperature of each refrigerating chamber, the effective utilization of the space of the heat insulation box is realized, the accurate temperature control without mutual influence is realized, and the operation of one-chamber heating, one-chamber freezing/refrigerating, independent defrosting and the like can be realized.

In one embodiment, two compressors 5 are driven by one engine 2, each compressor 5 is provided with an electromagnetic clutch, and the operation or stop of the compressor 5 is individually switched by opening and closing the electromagnetic clutch. That is, the two compressors 5 are electromagnetic clutch type compressors, and the start/stop (ON/OFF) of the two compressors 5 can be controlled according to the operation state of the respective independent refrigeration cycles. The electromagnetic clutch type compressor has the advantages of small volume, easy layout, low cost, opening and closing and the like. Specifically, the ECU control device changes the output signal by the control logic, and controls whether or not the electromagnetic clutch coil of the compressor is supplied with power to turn ON/OFF the compressor.

In the two refrigeration circulation systems, the ECU control device controls the compressor clutch, the evaporator fan motor, the valve parts and other parts of the refrigeration circulation loop which are not affected mutually so as to complete the refrigeration function, and the ECU control device controls the engine, the standby motor, the generator and other common power parts to provide power. The refrigerants of the two circuits are independent.

When one of the compressors 5 is driven or both compressors 5 are driven, the rotational speed of the engine can be changed according to the setting of the control logic specification. Specifically, the engine can be set to a high speed and a low speed, and the engine is switched to a high speed when any one of the refrigeration circulation circuits is in a high load state, and the engine is switched to a low speed when both of the refrigeration circulation circuits are in a low load state.

In addition, the ON/OFF of the compressor can be independently controlled through the double clutches, so that the fuel cost can be saved. Particularly, under the accurate temperature control mode of prior art, because the compressor passes through the belt lug connection on the engine, the compressor itself can only open and stop along with the engine, because of the engine can not realize frequent opening and stopping, so the compressor is in long-time running state, then can not let the compressor continuously refrigerate for the accuse temperature, so need refrigeration heating to run in a crisscross way. The work done by the heating part becomes the waste of energy. By adopting the start-stop control of the electromagnetic clutch type compressor capable of performing the ON/OFF independent control, the heating is not required, and thus the energy-saving effect can be realized.

Under the condition of adopting above-mentioned two refrigeration cycle return circuits, if adopt a plurality of condensers of arranging in series (see fig. 8) according to prior art, the refrigerant gets into from a preceding piece of condenser left side upper portion, then flows out from a preceding piece of condenser right side lower part, then flows in from a back piece of condenser right side upper portion again, again flows out from a back piece of condenser right side lower part, and the high temperature air that receives the influence of upstream side condensation core can be inhaled to the downflow side condensation core, leads to the heat dissipation badly to make two refrigeration cycle return circuits can not realize respective good accuse temperature.

Therefore, in order to maximize the condenser capacity and equalize the capacity of both the cycles and to realize good temperature control of each of the refrigeration cycle circuits, the condenser according to an embodiment of the present invention employs, as the condenser cores constituting the components, an upstream-side core and a downstream-side core arranged in series, and a single-piece core having a height-direction division structure.

In the embodiment shown in fig. 3 and 5 to 6, one condenser 6 may be shared by two refrigeration cycle circuits. Therefore, the number of components of the outdoor unit can be reduced, the cost is reduced, the space is saved, and the layout and the configuration of each component in the outdoor unit are facilitated.

Fig. 3 is a schematic view of two condenser cores of the condenser 6 according to an embodiment of the present invention, in which the two condenser cores are separated by a partition plate 13 in a height direction (i.e., a vertical direction), that is, each condenser core forms a refrigerant circulation space of upper and lower portions, and the upper and lower portions do not affect each other.

In order to maximize the heat exchange efficiency between air and refrigerant, the refrigerant enters the condenser core with poor heat dissipation conditions and is carried at the rear (closer to the outer wall of the outdoor unit) and then enters the condenser core with good heat dissipation conditions and is carried at the front (farther from the outer wall of the outdoor unit), thereby ensuring the maximization of the capacity of the condenser. In addition, the upper half and the lower half of the condenser which is carried in the front have equal heat dissipation conditions, and the upper half and the lower half of the condenser which is carried in the rear have equal heat dissipation conditions, thereby ensuring the capacity of two cycles to be uniform.

In the embodiment shown in fig. 3, the refrigerant in the first refrigeration cycle flows in from one side of the upper half of the rear condenser core and flows out from the same side of the upper half of the front condenser core; the refrigerant in the second refrigeration cycle loop flows in from the other side of the lower half part of the rear condenser core body and flows out from the same side of the lower half part of the front condenser core body.

FIG. 4 is a schematic view of a bracket connecting two condenser cores in a condenser according to an embodiment of the present invention. The condenser core body is fixedly arranged at the part a in the front, the condenser core body is fixedly arranged at the part b in the rear, the part c is used for fixing the whole condenser module to a main frame of the refrigerator, and the parts a, b and c are integrally formed. When the two condenser cores generate thermal stress in different directions, the thermal stress is mainly absorbed by the a-part cut structure, and when the two condenser cores generate thermal stress in the same direction, the thermal stress is mainly absorbed by the a-part cut structure and the c-part open structure together. Specifically, the notch structure of the part a is that two vertical sheet metals are not welded at the crossed position and the notch is reserved so as to achieve the purpose of absorbing stress. The bracket can avoid stress concentration, realize effective absorption of thermal stress and vibration durability.

Fig. 5 is a schematic view of the overall structure and the refrigerant flow direction of a condenser according to another embodiment of the present invention. In this embodiment, the refrigerant in the first refrigeration cycle flows in from one side of the upper half of the rear condenser core, and flows out of the condenser from the same side of the upper half of the front condenser core; the refrigerant in the second refrigeration cycle loop flows in from one side of the lower half part of the rear condenser core body, and flows out of the condenser after heat exchange from the same side of the lower half part of the front condenser core body.

Fig. 6 is a schematic view showing the overall structure and the refrigerant flow direction of a condenser according to still another embodiment of the present invention, and as shown in fig. 6, the refrigerant in the first refrigeration cycle circuit may flow in from one side of the upper half of the rear condenser core and flow out from the condenser from the same side of the lower half of the front condenser core; the refrigerant in the second refrigeration cycle loop flows in from one side of the lower half part of the rear condenser core body, and flows out of the condenser after heat exchange from the same side of the upper half part of the front condenser core body.

In order to allow the refrigeration cycle circuit of the refrigeration system including the present condenser to be independently operated, fig. 7 is a schematic view showing a temperature condition when only one refrigeration cycle circuit (e.g., the first refrigeration cycle circuit) is turned ON, as in fig. 7. When the second refrigeration cycle loop is not started, the corresponding compressor does not work, the circulation of the refrigerant is not brought, and the refrigerant of the first refrigeration cycle loop only flows in the condenser core body contacting with the cold air side. The condenser core body of the rear side is not influenced by the condenser core body of the front side, so that the heat exchange between the rear side and the front side and the low-temperature air can be realized, and the capacity of the condenser can be improved.

In the present embodiment, the two condenser cores are divided in the height direction (i.e., the vertical direction) by way of example, but the two condenser cores may be divided in the longitudinal direction (i.e., the horizontal direction) to achieve the same effect.

In addition, although the present embodiment has been described by taking two independent refrigeration cycle circuits as an example, three or more independent refrigeration cycle circuits may be provided depending on the number of refrigerators. The optimal arrangement mode of the condenser is that the condenser is directly faced with the wind, and the condenser does not need to be stacked front and back. However, for example, if the internal space is small and three or more refrigeration cycles are desired, the condenser may be divided into three upper, middle, and lower portions.

Many modifications and other embodiments of the invention will come to mind to one skilled in the art to which this invention pertains having the benefit of the teachings presented in the foregoing descriptions. Therefore, the foregoing description is to be construed as illustrative only and is for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of one or both of the structure and function may be substantially changed without departing from the spirit of the present invention.

Claims (2)

1. A condenser for use in a refrigeration system including two refrigeration cycle circuits for two compartments, respectively; it is characterized in that the preparation method is characterized in that,

the condenser consists of two condenser cores with mutually independent radiating surfaces overlapped in the projection direction, each condenser core is vertically or horizontally divided into a first part and a second part which are mutually not communicated in the radiating surface direction, the first part and the second part which are independent in a single condenser core are respectively connected to different refrigeration circulation loops, and the parts of the two condenser cores connected to the same refrigeration circulation loop are arranged in series in the refrigeration circulation loop;

the refrigerant in the first refrigeration cycle circuit flows in from one side of the first part of the first condenser core and flows out from one side of the second part of the second condenser core;

the refrigerant in the second refrigeration cycle flows in from the one side of the second portion of the first condenser core and flows out from the one side of the first portion of the second condenser core;

the first condenser core is located on the upstream side of the heat exchange air flow direction relative to the second condenser core, and a first portion of the first condenser core and a second portion of the second condenser core are staggered in the heat radiation surface projection direction;

the first refrigeration cycle and the second refrigeration cycle may be independently operated.

2. A refrigeration system comprising the condenser according to claim 1, wherein one of the condensers is shared by two refrigeration cycle circuits.

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