KR101859231B1 - A combined refrigerating and freezing system - Google Patents

Abstract

The present invention relates to a refrigerated refrigeration combined system.
The refrigerating and freezing combined system according to an embodiment of the present invention includes a first compressor for compressing a refrigerant for refrigerating operation in a first set space; A second compressor for compressing the refrigerant for freezing operation of the second setting space; A condenser arranged to pass the refrigerant compressed in the first compressor or the second compressor; A first evaporator for evaporating the refrigerant passing through the condenser and supplying cool air to the first setting space; A second evaporator for evaporating the refrigerant that has passed through the condenser and supplying cool air to the second setting space; And a flow regulator disposed on the outlet side of the first evaporator or the second evaporator and regulating the flow of the refrigerant flowing into the first compressor or the second compressor.

Description

[0001] A combined refrigerating and freezing system [

The present invention relates to a refrigerated refrigeration combined system.

The refrigerating system means that the refrigerant is cooled in the first predetermined space by heat exchange between the refrigerant flowing in the heat exchange cycle and the outdoor air, and heat exchange between the refrigerant and the first predetermined space. The refrigeration system is a refrigeration system in which the refrigeration of an article or the like is performed in the second predetermined space by heat exchange between the refrigerant flowing in the heat exchange cycle and the outdoor air and heat exchange between the refrigerant and the second predetermined space.

Specifically, the refrigeration system includes a first compressor for compressing the refrigerant, a refrigerating condenser for exchanging heat between the refrigerant and the indoor / outdoor air, a refrigeration expansion device for decompressing the refrigerant, An evaporator is included.

The refrigeration system includes a second compressor for compressing the refrigerant, a refrigerating condenser for condensing the refrigerant, a refrigerating expansion device for decompressing the refrigerant, and an evaporator for evaporating the refrigerant. Thus, the refrigeration system and the refrigeration system are driven by a similar refrigerant system.

However, in the related art, there is a problem that the refrigeration system and the refrigeration system are driven separately, which increases the manufacturing cost for constructing the system. In particular, it has been pointed out that the inefficiency of having a separate heat exchanger (e.g., a condenser) to drive the system is a problem.

On the other hand, in the process of separately operating the refrigeration system and the refrigeration system, when a failure occurs in one of the first compressor and the second compressor, the operation of the corresponding system is restricted. That is, the refrigeration system or the refrigeration system must be stopped until the faulty compressor is repaired or replaced.

As a result, there has been a problem in that the food stored in the first predetermined space or the second predetermined space is refrigerated or frozen, for example, the food is deteriorated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a refrigerating and freezing combined system in which a refrigerating and freezing system is constructed in a complex manner to enable emergency operation.

The refrigerating and freezing combined system according to an embodiment of the present invention includes a first compressor for compressing a refrigerant for refrigerating operation in a first set space; A second compressor for compressing the refrigerant for freezing operation of the second setting space; A condenser arranged to pass the refrigerant compressed in the first compressor or the second compressor; A first evaporator for evaporating the refrigerant passing through the condenser and supplying cool air to the first setting space; A second evaporator for evaporating the refrigerant that has passed through the condenser and supplying cool air to the second setting space; And a flow regulator disposed on the outlet side of the first evaporator or the second evaporator and regulating the flow of the refrigerant flowing into the first compressor or the second compressor.

According to another aspect of the present invention, there is provided a refrigerating and freezing combined system including: a first compressor for compressing a refrigerant for refrigerating operation in a first set space; A plurality of compressors for compressing the refrigerant for freezing operation of the second setting space; A condenser for condensing the refrigerant having passed through the first compressor or the second compressor; A first evaporator in which at least a part of the refrigerant passing through the condenser is branched and passed; A second evaporator through which the refrigerant other than the refrigerant flowing into the first evaporator flows into the refrigerant passing through the condenser; A first flow regulator disposed at an inlet side of the first compressor; And a plurality of flow regulating units disposed at respective inlet sides of the plurality of compressors to selectively restrict the refrigerant flow.

According to the embodiment of the present invention, since the refrigeration system and the refrigeration system are combined, heat exchange can be performed using one condenser, so that the system can be easily configured and the refrigeration and freezing operation can be performed at the same time.

In addition, even if a failure occurs in one of the first compressor constituting the refrigeration system and the second compressor constituting the refrigeration system, since the emergency operation of the system can be performed by using another compressor, the operation of the system must be stopped .

In addition, the refrigeration system having a large pressure difference between the low pressure and the high pressure of the refrigerant system has a plurality of compressors, and the compression ratio can be dispersed by a plurality of compressors, thereby improving the reliability of the compressor.

In addition, even if a failure occurs in one compressor among the plurality of compressors of the refrigeration system, the refrigeration system can be operated in emergency by other compressors, so that the system operation can be stably performed.

1 is a system diagram showing a configuration of a cold storage and refrigeration combined system according to a first embodiment of the present invention.
FIGS. 2 to 4 are views showing, by way of example, the normal operation mode of the system and the emergency operation mode when a failure occurs in one compressor in the refrigerating and freezing combined system according to the first embodiment of the present invention.
FIG. 5 is a system diagram showing a configuration of a cold storage and refrigeration combined system according to a second embodiment of the present invention.
6 to 10 are views showing, by way of example, the normal operation mode of the system and the emergency operation mode when a failure occurs in one compressor in the refrigerating and freezing combined system according to the second embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

1 is a system diagram showing a configuration of a cold storage and refrigeration combined system according to a first embodiment of the present invention.

Referring to Fig. 1, a refrigerating and freezing combined system (hereinafter, referred to as "combined system") according to a first embodiment of the present invention includes a refrigerating system and a refrigerating system.

In detail, the refrigeration system includes a first compressor 10 for compressing the refrigerant, a condenser 30 for condensing the refrigerant compressed in the first compressor 10, an air blower for blowing outside air to the condenser 30, A fan 35 and a first expansion device 42 for reducing the pressure of the refrigerant condensed in the condenser 30 and a first evaporator 50 for evaporating the refrigerant through the first expansion device 42. The first compressor (10) and the first evaporator (50) may be referred to as "refrigerating compressor" and "refrigerating evaporator", respectively.

The refrigeration system includes a second compressor 20 for compressing the refrigerant, a condenser 30 for condensing the refrigerant compressed by the second compressor 20, a blowing fan (not shown) for blowing outside air to the condenser 30 A second expansion device 45 for reducing the pressure of the refrigerant condensed in the condenser 30 and a second evaporator 60 for evaporating the refrigerant through the second expansion device 45. The second compressor (20) and the first evaporator (60) may be referred to as "refrigeration compressor" and "freezer evaporator", respectively.

The refrigeration system and the refrigeration system are characterized in that the first and second compressors 10 and 20 are connected in parallel to each other, and the refrigerant compressed in each compressor is heat exchanged with the outside air in one condenser 30.

The hybrid system (1) includes a refrigerant pipe (70) for guiding the refrigerant to circulate through the refrigeration system or the refrigeration system. The refrigerant pipe 70 is provided with a first pipe portion for connecting the first compressor 10, the condenser 30, the first expansion device 42 and the first evaporator 50, Quot; second piping portion "connecting the first evaporator 20, the condenser 30, the second expansion device 45 and the second evaporator 60 are included.

The refrigerant pipe 70 includes a first branch portion 72 for allowing the refrigerant passing through the condenser 30 to branch and flow to the first expansion device 42 and the second expansion device 45 . That is, some of the refrigerant passing through the condenser 30 flows to the first expansion device 42, and the remaining refrigerant flows to the second expansion device 45.

The combined system 1 includes a bypass flow path 80 for connecting an outlet side refrigerant pipe of the first evaporator 50 and an outlet side refrigerant pipe of the second evaporator 60. The bypass passage 80 is a refrigerant pipe, and both ends of the refrigerant pipe are connected to the first pipe portion and the second pipe portion.

The bypass passage 80 is configured to bypass the refrigerant circulating in the refrigeration system to the refrigeration system or to bypass the refrigerant circulating in the refrigeration system to the refrigeration system. That is, the bypass passage 80 bypasses the refrigerant that has passed through the first evaporator 50 to the outlet of the second evaporator 60, or bypasses the refrigerant that has passed through the second evaporator 60 to the outlet of the second evaporator 60, 1 evaporator (50).

The second branched portion 75 is formed at a position where the bypass line 80 is connected to the first piping portion and a third branched portion 77 is provided at a point where the bypass line 80 and the second piping portion are connected. . The composite system 1 is provided with a fourth branched portion 78 connected to the first piping portion and the second piping portion at one point on the inlet side of the condenser 30.

The branch portions 72, 75, 77, and 78 guide the refrigerants flowing in the refrigeration system or the refrigeration system to be branched by a plurality of paths or to be joined together by one path.

The hybrid system 1 further includes a plurality of flow controllers 110, 120 and 130 for guiding the flow of the refrigerant circulating through the system. In particular, the plurality of flow regulating units 110, 120, and 130 may be on / off controlled to selectively flow the refrigerant to the first compressor 10 or the second compressor 20. The flow regulating units 110, 120, and 130 may include valve devices.

The plurality of flow control units 110, 120 and 130 include a first flow control unit 110 disposed at an inlet side of the first compressor 10 to selectively allow the refrigerant to flow into the first compressor 10 .

When the first flow regulating unit 110 is closed, refrigerant in the refrigeration system that has passed through the first evaporator 50 may be restricted from entering the first compressor 10. Conversely, when the first flow regulator 110 is opened, the refrigerant of the refrigeration system that has passed through the first evaporator 50 may be introduced into the first compressor 10.

The plurality of flow control units 110, 120 and 130 may be disposed in the bypass flow path 80 such that the refrigerant of the refrigeration system is bypassed to the refrigeration system or the refrigerant of the refrigeration system is bypassed to the refrigeration system The second flow regulator 120 is selectively turned on and off.

When the second flow regulating part 120 is closed, the bypass of the refrigerant is restricted. When the second flow regulating part 120 is opened (opened), the refrigerant flows from the refrigeration system to the refrigeration system, To the refrigeration system.

The plurality of flow control units 110, 120 and 130 include a third flow control unit 130 disposed at the inlet side of the second compressor 20 to selectively allow the refrigerant to flow into the second compressor 20 .

When the third flow regulating part 130 is closed, the refrigerant of the refrigeration system that has passed through the second evaporator 60 may be restricted from flowing into the second compressor 20. Conversely, when the third flow regulator 130 is opened, the refrigerant of the refrigeration system that has passed through the second evaporator 60 may be introduced into the second compressor 20. [

Hereinafter, the refrigerant flow during normal operation and emergency operation of the combined system according to the first embodiment of the present invention will be described.

FIGS. 2 to 4 are views showing, by way of example, the normal operation mode of the system and the emergency operation mode when a failure occurs in one compressor in the refrigerating and freezing combined system according to the first embodiment of the present invention.

2 shows a state where the refrigeration system using the first compressor 10 and the refrigeration system using the second compressor 20 operate normally.

In detail, in the refrigeration system, the refrigerant compressed in the first compressor 10 is condensed in the condenser 30, branched in the first branch 72, and expanded in the first expansion device 42 . The refrigerant passing through the first expansion device 42 passes through the first evaporator 50, the first flow regulator 110, and then flows into the first compressor 10 again.

At this time, the first flow regulating part 110 is opened and the second flow regulating part 120 is closed. Accordingly, the refrigerant evaporated in the first evaporator (50) is restricted from flowing into the bypass flow path (80).

The refrigerant compressed in the second compressor 20 is mixed with the refrigerant circulating in the refrigeration system and the fourth branch 78 to be introduced into the condenser 30. The refrigerant condensed in the condenser 30 is branched at the first branched portion 72 and flows into the second expansion device 45 and is evaporated in the second evaporator 60. The refrigerant evaporated in the second evaporator (60) flows into the second compressor (20) through the third flow regulator (130).

At this time, as described above, the second flow regulator 120 is closed and the third flow regulator 130 is opened. Therefore, the refrigerant vaporized in the second evaporator 60 is limited to the refrigerant flowing into the bypass passage 80, and can be introduced into the second compressor 20.

Thus, when the refrigeration system and the refrigeration system are operated normally, the refrigerant circulating through the system can be compressed by the first compressor 10 and the second compressor 20, respectively.

3 shows a flow of refrigerant circulating in the combined system when a failure occurs in the first compressor 10 of the refrigeration system.

The refrigerant passing through the condenser 30, the first expansion device 42 and the first evaporator 50 does not flow into the first compressor 10 but flows into the bypass passage 80, To the second compressor (20).

At this time, the first flow regulating unit 110 is closed and the second flow regulating unit 120 is opened so that the refrigerant that has passed through the first evaporator 50 bypasses the first compressor 10 And flows into the second compressor (20).

On the other hand, in the refrigeration system, refrigerant flows in the same manner as described in FIG. As a result, in order to bypass the failed first compressor 10, the refrigerant in the refrigerating system may be introduced into the second compressor 20 through the bypass flow path 80. In this way, when a failure occurs in the compressor of the refrigeration system, the refrigerant of the refrigeration system can be circulated by using the compressor of the refrigeration system.

4 shows a flow of the refrigerant circulating in the combined system when a failure occurs in the second compressor 20 of the refrigeration system.

In detail, in the refrigeration system, the refrigerant flows in the same manner as described in FIG.

The refrigerant passing through the condenser 30, the second expansion device 45 and the second evaporator 60 does not flow into the second compressor 20 but flows through the bypass flow path 80, To the first compressor (10).

At this time, the third flow regulating part 130 is closed, the second flow regulating part 120 is opened, and the refrigerant passing through the second evaporator 60 bypasses the second compressor 20 And flows into the first compressor (10).

In this way, when a failure occurs in the compressor of the refrigeration system, the refrigerant of the refrigeration system can be circulated by using the compressor of the refrigeration system.

Hereinafter, a second embodiment of the present invention will be described. The present embodiment differs from the first embodiment mainly in terms of differences in some configurations. Therefore, the description and the reference numerals of the first embodiment are used for the same portions as those of the first embodiment.

FIG. 5 is a system diagram showing a configuration of a cold storage and refrigeration combined system according to a second embodiment of the present invention.

Referring to FIG. 5, the hybrid system 1 according to the second embodiment of the present invention includes a refrigeration system including a first compressor 10, a second compressor 20 and a third compressor 25 And a refrigeration system. The pressure difference between the low pressure and the high pressure of the refrigerant cycle driven in the refrigeration system is formed larger than that in the refrigeration cycle so that the compression ratio in each compressor can be formed within a suitable range by compressing the refrigerant using a plurality of compressors.

The second and third compressors (20, 25) are connected in series. The first compressor (10) and the second and third compressors (20, 25) are connected in parallel with each other.

The first flow regulating part 10 is disposed at the inlet side of the first compressor 10 and the second flow regulating part 120 is disposed at the bypass flow path 80. A third flow regulator 130 is disposed on the inlet side of the third compressor 25 and a fifth flow regulator 150 is disposed on the inlet side of the second compressor 20.

The combined system 1 is provided with a second bypass passage 82 for bypassing the third compressor 25 and a third bypass passage 84 for bypassing the second compressor 20 / RTI > In order to prevent confusion of the name, the bypass passage 80 is called a "first bypass passage ".

The second bypass passage 82 is provided with a fourth flow controller 140 for allowing the refrigerant to selectively pass through the second bypass passage 82. The third bypass passage 84 is provided with a sixth flow control portion 160 for allowing the refrigerant to selectively pass through the third bypass passage 84.

According to the on / off operation of the third to sixth flow controllers 130, 140, 150, and 160, the refrigerant circulating in the refrigeration system passes through both the second compressor 20 and the third compressor 25, The passage through at least one of the compressors 20, 25 may be limited.

That is, whether or not the third to sixth flow regulators 130, 140, 150, and 160 are opened or closed can be determined based on whether or not a failure has occurred in the second compressor 20 or the third compressor 25.

In the hybrid system 1, a refrigerant path is branched so that the refrigerant that has passed through the second evaporator 60 can flow into the third compressor 25 or the second bypass path 82, And a sixth branching part for branching the refrigerant path so that the refrigerant can flow from the outlet side of the third compressor (25) to the second compressor (20) or the third bypass flow path (84) (95).

Hereinafter, the refrigerant flow during normal operation and emergency operation of the hybrid system according to the second embodiment of the present invention will be described.

6 to 10 are views showing, by way of example, the normal operation mode of the system and the emergency operation mode when a failure occurs in one compressor in the refrigerating and freezing combined system according to the second embodiment of the present invention.

FIG. 6 shows a state in which the hybrid system according to the second embodiment of the present invention operates normally.

First, the refrigerant compressed in the first compressor 10 is condensed in the condenser 30, branched in the first branch 72, and expanded in the first expansion device 42. The refrigerant passing through the first expansion device 42 passes through the first evaporator 50, the first flow regulator 110, and then flows into the first compressor 10 again.

At this time, the first flow regulating part 110 is opened and the second flow regulating part 120 is closed. Accordingly, the refrigerant evaporated in the first evaporator (50) is restricted from flowing into the bypass flow path (80).

The refrigerant compressed in the second compressor (20) and the third compressor (25) is mixed with the refrigerant circulating in the refrigerating system and the fourth branch (78) Lt; / RTI > The refrigerant condensed in the condenser 30 is branched at the first branched portion 72 and flows into the second expansion device 45 and is evaporated in the second evaporator 60.

The refrigerant evaporated in the second evaporator 60 flows into the third compressor 25 through the third flow regulator 130 and the refrigerant compressed in the third compressor 25 flows into the third compressor 25, Passes through the fifth flow regulator (150) and is compressed again in the second compressor (20). That is, the refrigerant in the refrigeration system can be compressed in two stages.

At this time, as described above, the second flow regulator 120 is closed, and the third flow regulator 130 and the fifth flow regulator 150 are opened. The fourth flow regulating part 140 and the sixth flow regulating part 160 provided respectively in the second and third bypass flow paths 82 and 84 are closed.

Accordingly, the refrigerant evaporated in the second evaporator 60 is restricted from flowing into the bypass flow path 80, and can be sequentially compressed in the third compressor 25 and the second compressor 20. Thus, when the refrigeration system and the refrigeration system are normally operated, the refrigerant circulating through the system can be compressed by the first compressor 10, the second compressor 20, and the third compressor 25, respectively.

7 shows the flow of refrigerant circulating in the combined system when a failure occurs in the first compressor 10 of the refrigeration system.

The refrigerant passing through the condenser 30, the first expansion device 42 and the first evaporator 50 does not flow into the first compressor 10 but flows into the bypass passage 80, And then flows into the third compressor (25).

At this time, the first flow regulating unit 110 is closed and the second flow regulating unit 120 is opened so that the refrigerant that has passed through the first evaporator 50 bypasses the first compressor 10 And flows into the third compressor (25).

On the other hand, in the refrigeration system, refrigerant flows in the same manner as described in FIG. As a result, in order to bypass the failed first compressor 10, the refrigerant in the refrigeration system may be introduced into the compressors 25 and 20 of the refrigeration system through the bypass flow path 80.

In this way, when a failure occurs in the compressor of the refrigeration system, the refrigerant of the refrigeration system can be circulated by using the compressor of the refrigeration system.

8 shows a flow of the refrigerant circulating in the combined system when a failure occurs in the second compressor 20 of the refrigeration system.

In detail, in the refrigeration system, the refrigerant flows in the same manner as described in FIG.

In the refrigeration system, the refrigerant condensed in the condenser 30 is branched at the first branch 72 to pass through the second expansion device 45 and the second evaporator 60. Then, the refrigerant passes through the third branched portion 77 and flows into the third compressor (25).

At this time, the second flow regulating part 120 is closed and the refrigerant passing through the second evaporator 60 is restricted from flowing into the first bypass flow path 80. The third flow regulating part 130 is opened and the fourth flow regulating part 140 is closed so that the refrigerant is prevented from flowing into the second bypass flow path 82, Can be guided.

The refrigerant compressed in the third compressor 25 flows along the third bypass passage 84 and is mixed with the refrigerant in the refrigeration system in the fourth branch portion 78. That is, the refrigerant bypasses the failed second compressor (20) and flows into the condenser (30).

At this time, the fifth flow regulating part 150 is closed and the sixth flow regulating part 160 is opened, and the refrigerant flows from the sixth branch part 95 to the third bypass flow path 84 .

As described above, refrigerant circulation can be performed by bypassing a compressor in which a failure has occurred in a plurality of compressors, so that an emergency operation can be performed without stopping the refrigeration system.

9 shows a flow of the refrigerant circulating in the combined system when a failure occurs in the third compressor 25 of the refrigeration system.

In detail, in the refrigeration system, the refrigerant flows in the same manner as described in FIG.

In the refrigeration system, the refrigerant condensed in the condenser 30 is branched at the first branch 72 to pass through the second expansion device 45 and the second evaporator 60. Then, the refrigerant flows to the second bypass flow passage 82 via the third branch portion 77 and the fifth branch portion 91.

At this time, the second flow regulating part 120 is closed and the refrigerant passing through the second evaporator 60 is restricted from flowing into the first bypass flow path 80. The third flow regulating part 130 is closed and the fourth flow regulating part 140 is opened so that the refrigerant is prevented from flowing into the third compressor 25, 82, respectively.

The refrigerant bypassed by the third compressor (25) flows into the second compressor (20) from the sixth branch (95). At this time, the fifth flow regulating part 150 is opened and the sixth flow regulating part 160 is closed, so that the refrigerant can be restricted from flowing to the third bypass flow path 84.

The refrigerant compressed in the second compressor (20) may be mixed with the refrigerant in the refrigeration system in the fourth branch (78) and may be introduced into the condenser (30).

10 shows the flow of the refrigerant circulating in the combined system when all of the second and third compressors 20 and 25 of the refrigeration system fail.

In detail, in the refrigeration system, the refrigerant flows in the same manner as described in FIG.

In the refrigeration system, the refrigerant condensed in the condenser 30 is branched at the first branch 72 to pass through the second expansion device 45 and the second evaporator 60. The refrigerant flows into the first compressor (10) via the second flow regulator (120).

At this time, the first and second flow regulating portions 120 are opened and the third to sixth flow regulating portions 130, 140, 150, and 160 are closed. Accordingly, the refrigerant in the refrigerating system is restricted from flowing into the third compressor (25) from the third branch (77), and the refrigerant can be guided to the first bypass passage (80).

Thus, when a failure occurs in a plurality of compressors provided in the refrigeration system, the refrigerant in the refrigeration system is compressed using the compressor in the refrigeration system, and the system can be operated in an emergency, so that the system can be stopped.

1: Refrigerated refrigeration combined system 10: First compressor
20: second compressor 25: third compressor
30: condenser 35: blowing fan
42: first expansion device 45: second expansion device
50: first evaporator 60: second evaporator
70: refrigerant pipe 72, 75, 77, 78, 91, 95:
80: first bypass passage 82: second bypass passage
84: third bypass passage 110 to 160: first to sixth flow regulating sections

Claims (12)

A first compressor for compressing the refrigerant for the refrigerating operation of the first setting space;
A second compressor for compressing the refrigerant for freezing operation of the second setting space;
A condenser arranged to pass the refrigerant compressed in the first compressor or the second compressor;
A first evaporator for evaporating the refrigerant passing through the condenser and supplying cool air to the first setting space;
A second evaporator for evaporating the refrigerant that has passed through the condenser and supplying cool air to the second setting space;
A first flow regulator disposed at an inlet side of the first compressor for regulating the flow of the refrigerant passing through the first evaporator or the second evaporator;
A third flow regulator disposed at an inlet side of the second compressor and regulating the flow of the refrigerant passing through the first evaporator or the second evaporator; And
The refrigerant passing through the first evaporator is bypassed to the outlet side of the second evaporator and guided to the inlet side of the second compressor, or the refrigerant having passed through the second evaporator is bypassed to the outlet side of the first evaporator, 1 " compressor,
Wherein the bypass flow path includes a second flow control section that is controlled so that the refrigerant selectively flows through the bypass flow path. delete delete delete The method according to claim 1,
When a failure occurs in the first compressor,
Wherein the first flow regulator is closed and the second flow regulator and the third flow regulator are opened. The method according to claim 1,
When a failure occurs in the second compressor,
Wherein the third flow regulator is closed and the second flow regulator and the first flow regulator are opened. A first compressor for compressing the refrigerant for the refrigerating operation of the first setting space;
A second compressor and a third compressor connected in series to compress refrigerant for freezing operation of the second setting space;
A condenser for condensing the refrigerant having passed through at least one of the first compressor, the second compressor, and the third compressor;
A first evaporator in which at least a part of the refrigerant passing through the condenser is branched and passed;
A second evaporator through which the refrigerant other than the refrigerant flowing into the first evaporator flows into the refrigerant passing through the condenser;
A first flow regulator disposed at an inlet side of the first compressor for regulating the flow of the refrigerant passing through the first evaporator or the second evaporator;
A fifth flow regulator disposed at an inlet side of the second compressor and adapted to regulate the flow of the refrigerant passing through the first evaporator or the second evaporator;
A third flow regulator disposed at an inlet side of the third compressor for regulating the flow of the refrigerant passing through the first evaporator or the second evaporator;
A first bypass flow path for guiding the refrigerant evaporated in the first evaporator to flow into the second compressor or the third compressor by bypassing the first compressor;
A third bypass passage for allowing the refrigerant evaporated in the second evaporator to bypass the second compressor;
A second bypass passage through which the refrigerant evaporated in the second evaporator bypasses the third compressor;
A second flow regulator provided in the first bypass flow path to selectively restrict the flow of the refrigerant;
A fourth flow regulator provided in the second bypass passage to selectively restrict the flow of the refrigerant; And
And a sixth flow control part provided in the third bypass flow path to selectively restrict the flow of the refrigerant. delete delete delete delete delete

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