JP2011084084A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of preventing lowering of coolant condensing efficiency of a condenser. <P>SOLUTION: This air conditioner includes a compressor, the condenser, an inflation valve, an evaporator, an intermediate heat exchanger 10 performing heat exchange between high pressure coolant flowing out of the condenser and low pressure coolant flowing out of the evaporator, and a liquid reservoir part 20. The intermediate heat exchanger 10 includes an outer pipe 13 and an inner pipe 14 arranged with a space in the outer pipe 13. A clearance between the outer pipe 13 and the inner pipe 14 is made as a high temperature side coolant passage 11, while the inside of the inner pipe 14 is made as a low temperature side coolant passage 12. The high temperature side coolant passage 11 includes a coolant inlet 15 and a coolant outlet 16. The inside of the high temperature side coolant passage 11 is divided into a coolant inlet side portion 11A and a coolant outlet side portion 11B. The liquid reservoir part 20 includes a coolant inflow port 22 and a coolant outflow port 23. The coolant inlet side portion 11A and the coolant outflow port 22 in the high temperature side coolant passage 11 and the coolant outlet side portion 11B and the coolant outflow port 23 in the high temperature side coolant passage 11 are led, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioner mounted on a vehicle, for example.

  In this specification and claims, the term “liquid phase refrigerant” means a liquid phase refrigerant in which a trace amount of a gas phase refrigerant is mixed in addition to a refrigerant consisting entirely of a liquid phase. The term “gas-phase refrigerant” means a gas-phase refrigerant in which a very small amount of liquid-phase refrigerant is mixed in addition to a refrigerant consisting entirely of the gas phase.

  Hereinafter, the same portions and the same parts are denoted by the same reference numerals throughout the drawings, and redundant description is omitted.

  For example, as a vehicle air conditioner mounted on a vehicle, as shown in FIG. 4, a compressor (1), a condenser (2) for cooling the refrigerant compressed by the compressor (1), and a condenser (2) An expansion valve (3) as a pressure reducer for depressurizing the refrigerant cooled in step 4, an evaporator (4) for evaporating the depressurized refrigerant, a high temperature side refrigerant passage (6) and a low temperature side refrigerant passage (7) The high-temperature and high-pressure refrigerant flowing out of the condenser (2) and flowing in the high-temperature side refrigerant passage (6) and the low-temperature and low-pressure refrigerant flowing out of the evaporator (4) and flowing in the low-temperature side refrigerant passage (7) are heated. An intermediate heat exchanger (5) to be exchanged, and a liquid reservoir that stores high-temperature and high-pressure refrigerant that flows out of the condenser (2) and is decompressed by the expansion valve (3), and separates it into a liquid phase and a gas phase. (8), a liquid reservoir (8) is provided between the condenser (2) and the intermediate heat exchanger (5), and the refrigerant is connected to the intermediate heat exchanger (5). Before entering the warm side refrigerant passage (6), it enters the liquid reservoir (8), and after exiting from the liquid reservoir (8), enters the high temperature side refrigerant passage (6) of the intermediate heat exchanger (5). A vehicular air conditioner configured to flow in is known (see Patent Document 1).

  In the vehicle air conditioner described in Patent Document 1, the high-temperature and high-pressure refrigerant (see state A in FIG. 5) compressed by the compressor (1) is cooled in the condenser (2) (see state B in FIG. 5). The cooled refrigerant flows into the liquid reservoir (8) and is separated into a liquid phase and a gas phase. The refrigerant flowing out of the liquid reservoir (8) flows into the high temperature side refrigerant passage (6) of the intermediate heat exchanger (5), and flows out of the evaporator (4) when flowing through the high temperature side refrigerant passage (6). And it is supercooled by the comparatively low-temperature refrigerant | coolant which flows through a low temperature side refrigerant path (7) (refer FIG. 5 state C). The high-pressure refrigerant supercooled in the intermediate heat exchanger (5) is adiabatically expanded and decompressed in the expansion valve (3) (see state D in FIG. 5). The depressurized refrigerant enters the evaporator (4) and cools the air flowing through the ventilation gap while flowing through the evaporator (4) to become a gas phase (see state E in FIG. 5). The relatively low-temperature refrigerant that has passed through the evaporator (4) passes through the low-temperature-side refrigerant passage (7) of the intermediate heat exchanger (5). The low temperature side refrigerant passing through the low temperature side refrigerant passage (7) of the intermediate heat exchanger (5) is overheated by the high temperature side refrigerant flowing through the high temperature side refrigerant passage (6) and the temperature is raised (see state F in FIG. 5). ) In this state, it is sent to the compressor (1) and compressed.

  By the way, in the vehicle air conditioner described in Patent Document 1, it is the refrigerant in the state B of FIG. 5 that flows into the liquid reservoir (8), but in the liquid reservoir (8), the liquid phase and the gas phase In order to perform the separation efficiently, the liquid phase refrigerant in the liquid reservoir (8) needs to be stably maintained in the liquid phase state without changing to the gas phase refrigerant. In the liquid reservoir (8), in order to stably maintain the liquid phase refrigerant in the liquid phase without changing to the gas phase refrigerant, the refrigerant flowing into the liquid reservoir (8) is actually used. It is necessary to supercool at about 3 to 5 ° C. Therefore, in the vehicle air conditioner described in Patent Document 1, it is necessary to supercool the refrigerant in the condenser (2) by about 3 to 5 ° C. However, when the refrigerant is supercooled in the condenser (2), if the area of the effective core part is constant, the area of the part contributing to the condensation of the refrigerant must be reduced, and the refrigerant condensation in the condenser (2) Efficiency is reduced. In addition, when the refrigerant condensing efficiency of the condenser (2) is reduced, it is necessary to reduce the amount of refrigerant circulating in the vehicle air conditioner, and the cooling capacity is reduced. Further, when the refrigerant is supercooled in the condenser (2), there is a problem that the supercooling efficiency varies greatly depending on the wind speed and wind speed distribution received and the outside air temperature.

JP 2005-22601 A

  An object of the present invention is to provide an air conditioner that can solve the above-described problems and prevent a decrease in refrigerant condensation efficiency of a condenser.

  In order to achieve the above object, the present invention comprises the following aspects.

1) a compressor, a condenser that cools the refrigerant compressed by the compressor, a decompressor that decompresses the refrigerant cooled by the condenser, an evaporator that evaporates the decompressed refrigerant, a high-temperature side refrigerant passage, and a low-temperature side refrigerant An intermediate heat exchanger that exchanges heat between the high-pressure refrigerant that flows out of the condenser and flows through the high-temperature side refrigerant path and the low-pressure refrigerant that flows out of the evaporator and flows through the low-temperature side refrigerant path; In the air conditioner comprising a liquid reservoir that stores the high-pressure refrigerant before flowing out and decompressed by the decompressor, and that separates into a liquid phase and a gas phase,
The high temperature side refrigerant passage of the intermediate heat exchanger has a refrigerant inlet and a refrigerant outlet, and the refrigerant enters the liquid reservoir from the intermediate portion between the refrigerant inlet and the refrigerant outlet in the high temperature side refrigerant passage of the intermediate heat exchanger. An air conditioner that enters and returns from the liquid reservoir to the high-temperature side refrigerant passage.

  2) The intermediate heat exchanger is a double pipe type having an outer pipe and an inner pipe arranged at intervals in the outer pipe, and the gap between the outer pipe and the inner pipe is a high temperature side refrigerant passage And the air conditioner according to 1) above, wherein the inner pipe is a low-temperature refrigerant passage.

  3) The high-temperature side refrigerant passage of the intermediate heat exchanger is divided into a refrigerant inlet side portion and a refrigerant outlet side portion, and the liquid reservoir has a refrigerant inlet and a refrigerant outlet, and the intermediate heat exchanger The refrigerant inlet side portion in the high temperature side refrigerant passage and the refrigerant inlet of the liquid reservoir, and the refrigerant outlet side portion in the high temperature side refrigerant passage of the intermediate heat exchanger and the refrigerant outlet of the liquid reservoir are respectively communicated. The air conditioner according to 2) above.

  4) Refrigerant inlet side portion and liquid reservoir inlet portion in the high temperature side refrigerant passage of the intermediate heat exchanger, and refrigerant outlet side portion and refrigerant outlet portion of the liquid reservoir in the high temperature side refrigerant passage of the intermediate heat exchanger The air conditioner according to 3) above, wherein one end is joined to the outer pipe of the intermediate heat exchanger and the other end is connected via a communication pipe joined to the liquid reservoir.

  5) The liquid reservoir has a refrigerant passage port below the interface between the liquid-phase refrigerant and the gas-phase refrigerant formed in the liquid reservoir, and the liquid reservoir is formed in the high-temperature side refrigerant passage of the intermediate heat exchanger. The air conditioner according to 2) above, wherein the refrigerant passage of the part is communicated.

  6) The outer pipe of the intermediate heat exchanger is formed with an opening through which the high-temperature refrigerant passage communicates with the outside, and the liquid reservoir is formed of a cylindrical body with the lower end opened and the upper end closed, and the lower end opening The air conditioner according to 5) above, wherein the air passage is a refrigerant passage, and the liquid reservoir is joined to the outer pipe so that the refrigerant passage and the opening of the outer pipe of the intermediate heat exchanger communicate with each other.

  According to the air conditioners of 1) to 6) above, the high temperature side refrigerant passage of the intermediate heat exchanger has a refrigerant inlet and a refrigerant outlet, and the refrigerant is connected to the refrigerant inlet in the high temperature side refrigerant passage of the intermediate heat exchanger. Since the refrigerant enters the liquid reservoir from the intermediate portion between the refrigerant outlet and returns to the high temperature side refrigerant passage from the liquid reservoir, the refrigerant that has entered the high temperature side refrigerant passage of the intermediate heat exchanger enters the liquid reservoir. In the meantime, the refrigerant is cooled by the refrigerant flowing through the low-temperature side refrigerant passage of the intermediate heat exchanger. Therefore, the refrigerant can be supercooled in the intermediate heat exchanger before flowing into the liquid reservoir, and the liquid phase refrigerant in the liquid reservoir can be stably maintained in a liquid phase state without changing to a gas phase refrigerant. Thus, the liquid phase and the gas phase can be separated efficiently in the liquid reservoir. As a result, the entire effective core portion of the capacitor can be contributed to the condensation of the refrigerant, and a decrease in the refrigerant condensation efficiency of the capacitor can be prevented. In addition, since the refrigerant condensation efficiency of the condenser can be prevented from being lowered, it is not necessary to reduce the amount of refrigerant circulating through the air conditioner, and the cooling capacity can be prevented from being lowered. In addition, since the refrigerant flowing through the low temperature side refrigerant passage of the intermediate heat exchanger flows through the high temperature side refrigerant passage and flows into the liquid reservoir, the refrigerant is subcooled. Therefore, a stable supercooling degree can be obtained.

It is a figure which shows the structure of the vehicle air conditioner to which this invention is applied. It is the vertical longitudinal cross-sectional view which abbreviate | omitted one part which shows the intermediate heat exchanger and liquid reservoir part of the vehicle air conditioner shown in FIG. It is the vertical longitudinal cross-sectional view which abbreviate | omitted one part which shows the modification of the intermediate heat exchanger and liquid reservoir part of the vehicle air conditioner shown in FIG. It is a figure which shows the structure of the conventional vehicle air conditioner. It is a Mollier diagram of an air conditioner for vehicles.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the air conditioner of the present invention is applied to a vehicle air conditioner mounted on a vehicle.

  In the following description, the top and bottom, left and right in FIGS. 2 and 3 are referred to as top and bottom and left and right.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  FIG. 1 shows the configuration of a vehicle air conditioner to which the present invention is applied, and FIG. 2 shows an intermediate heat exchanger and a liquid reservoir used in the vehicle air conditioner of FIG.

  In the vehicle air conditioner shown in FIG. 1, a high-temperature side refrigerant passage (11) through which high-temperature and high-pressure refrigerant flowing out from the condenser (2) flows and a low-temperature side refrigerant passage through which low-temperature and low-pressure refrigerant flowing out from the evaporator (4) flow ( 12) is stored in the intermediate heat exchanger (10) having a high pressure before flowing out of the condenser (2) and decompressed by the expansion valve (3), and separated into a liquid phase and a gas phase. A liquid reservoir (20) for accumulating liquid phase refrigerant in the lower part is provided.

  As shown in FIG. 2, the intermediate heat exchanger (10) includes an aluminum outer pipe (13) and an aluminum inner pipe (14) arranged at intervals in the outer pipe (13). It is a double pipe type, and the gap between the outer pipe (13) and the inner pipe (14) is a high temperature side refrigerant passage (11), and the inside of the inner pipe (14) is a low temperature side refrigerant passage (12 The refrigerant inlet (15) is provided at one end of the high temperature side refrigerant passage (11), here the left end, and the refrigerant outlet (16) is provided at the other end, here the right end. . A pipe (30) extending from the condenser (2) is connected to the refrigerant inlet (15), and a pipe (31) extending to the expansion valve (3) is connected to the refrigerant outlet (16).

  The outer pipe (13) of the intermediate heat exchanger (10) is composed of two tubular components (13A) (13B) arranged in a straight line in the left-right direction and closed at both ends. ) Is divided into a refrigerant inlet side portion (11A) and a refrigerant outlet side portion (11B). A refrigerant inlet (15) is provided at the left end of the left side component (13A) of the outer pipe (13), and a refrigerant outlet (17) to the liquid reservoir (20) is provided at the right end. A refrigerant outlet (16) is provided at the right end of the right side component (13B) of the outer pipe (13), and a refrigerant inlet (18) from the liquid reservoir (20) is provided at the left end. Yes. The gap between the left side component (13A) and the inner pipe (14) becomes the refrigerant inlet side portion (11A) of the high temperature side refrigerant passage (11), and the right side component (13B) and the inner pipe (14) A gap between the two forms a refrigerant outlet side portion (11B) of the high temperature side refrigerant passage (11). Both ends of the inner pipe (14) of the intermediate heat exchanger (10) protrude outward from both ends of the outer pipe (13). That is, the left end of the inner tube (14) is on the left side of the left end of the left side component (13A) of the outer tube (13), and the right end is from the right end of the right side component (13B) of the outer tube (13). Also, the inner pipe (14) penetrates the both-end closed parts (13a) (13b) of both constituent parts (13A) (13B) of the outer pipe (13) so as to protrude to the right side. Although not shown, a pipe extending from the evaporator (4) is connected to the right end of the inner pipe (14), and a pipe extending to the compressor (1) is connected to the left end of the inner pipe (14).

  The liquid reservoir (20) is formed of a sealed cylindrical body (21) whose upper and lower ends are closed, and a refrigerant inlet (22) and a refrigerant outlet (23) are formed in the bottom wall (21a). Refrigerant outlet (17) of left side component (13A) of outer pipe (13) of intermediate heat exchanger (10), refrigerant inlet (22) of liquid reservoir (20), and intermediate heat exchanger (10) The refrigerant inlet (18) of the right side component (13B) of the outer pipe (13) and the refrigerant outlet (23) of the liquid reservoir (20) are connected by aluminum communication pipes (32) and (33), respectively. ing. That is, the refrigerant inlet side portion (11A) in the high temperature side refrigerant passage (11) of the intermediate heat exchanger (10), the refrigerant inlet (22) of the liquid reservoir (20), and the intermediate heat exchanger (10) The refrigerant outlet side portion (11B) in the high temperature side refrigerant passage (11) and the refrigerant outlet (23) of the liquid reservoir (20) each have one end at the outer pipe (13) of the intermediate heat exchanger (10). The other end is connected through communication pipes (32) and (33) joined to the liquid reservoir (20).

  In the vehicle air conditioner shown in FIG. 1 and FIG. 2, the high-temperature and high-pressure gas-liquid mixed phase refrigerant compressed by the compressor (1) is cooled in the condenser (2) and the outer pipe of the intermediate heat exchanger (10). The refrigerant enters the refrigerant inlet side portion (11A) of the high temperature side refrigerant passage (11) from the refrigerant inlet (15) of the left side component (13A) in (13). The refrigerant that has entered the refrigerant inlet side portion (11A) of the high temperature side refrigerant passage (11) flows through the refrigerant inlet side portion (11A), and is connected to the refrigerant outlet port (17), the communication pipe (32), and the refrigerant inlet port. (22) enters the liquid reservoir (20) and is separated into a liquid phase and a gas phase. Then, the liquid phase refrigerant passes from the liquid reservoir (20) through the refrigerant outlet (23), the communication pipe (33), and the refrigerant inlet (18) in the outer pipe (13) of the intermediate heat exchanger (10). It enters the refrigerant outlet side portion (11B) of the high temperature side refrigerant passage (11) of the right side component (13B). The refrigerant that has entered the refrigerant outlet side portion (11B) of the high temperature side refrigerant passage (11) flows in the refrigerant outlet side portion (11B), and the refrigerant outlet ( It flows out of 16) and is depressurized in the expansion valve (3). The decompressed refrigerant enters the evaporator (4), and cools the air flowing through the ventilation gap while flowing through the evaporator (4) to become a gas phase. The relatively low-temperature refrigerant that has passed through the evaporator (4) passes through the low-temperature refrigerant passage (12) in the inner pipe (14) of the intermediate heat exchanger (10) and is sent to the compressor (1) for compression. Is done.

  Here, the high-temperature and high-pressure refrigerant sent from the condenser (2) and entering the refrigerant inlet side portion (11A) of the high temperature side refrigerant passage (11) of the intermediate heat exchanger (10) is the refrigerant inlet side portion (11A ) Is cooled by the low-temperature and low-pressure refrigerant flowing in the low-temperature side refrigerant passage (12) while flowing in the interior, so that intermediate heat exchange is performed before the high-temperature and high-pressure refrigerant flows into the liquid reservoir (20). Cooled by the refrigerant flowing through the low temperature side refrigerant passage (12) of the vessel (10). Accordingly, the refrigerant flowing into the liquid reservoir (20) is in a supercooled state (see state G in FIG. 5), and the liquid phase refrigerant in the liquid reservoir (20) is changed into a liquid phase refrigerant without changing to a gas phase refrigerant. Thus, the liquid phase and the gas phase can be efficiently separated in the liquid reservoir (20). As a result, the entire effective core part of the condenser (2) can be contributed to the condensation of the refrigerant, and a reduction in the refrigerant condensation efficiency of the condenser (2) can be prevented. In addition, since it is possible to prevent the refrigerant condensation efficiency of the condenser (2) from being lowered, it is not necessary to reduce the amount of refrigerant circulating through the air conditioner, and the cooling capacity can be prevented from being lowered. Further, the refrigerant flowing through the low-temperature side refrigerant passage (12) of the intermediate heat exchanger (10) performs supercooling of the refrigerant flowing through the high-temperature side refrigerant passage (11) and flowing into the liquid reservoir (20). Therefore, the supercooling of the refrigerant does not depend on the fluctuation of the wind speed or the outside air temperature, and a stable degree of supercooling can be obtained.

  The high-temperature and high-pressure refrigerant that flows out of the liquid reservoir (20) and enters the refrigerant outlet side portion (11B) of the high temperature side refrigerant passage (11) of the intermediate heat exchanger (10) 11B) is further cooled by the low-temperature and low-pressure refrigerant flowing in the low-temperature side refrigerant passage (12) while flowing in the low-temperature side refrigerant passage (12), and, as in the case of the conventional vehicle air conditioner shown in FIG. To be cooled.

  FIG. 3 shows a modification of the intermediate heat exchanger and the liquid reservoir used in the vehicle air conditioner of FIG.

  In FIG. 3, the intermediate heat exchanger (40) is a double pipe provided with an aluminum outer pipe (41) and an aluminum inner pipe (42) arranged at intervals in the outer pipe (41). The gap between the outer pipe (41) and the inner pipe (42) is the high temperature side refrigerant passage (11), and the inner pipe (42) is the low temperature side refrigerant passage (12). The refrigerant inlet (15) is provided at one end of the high temperature side refrigerant passage (11), here the left end, and the refrigerant outlet (16) is provided at the other end, here the right end. The outer pipe (41) of the intermediate heat exchanger (40) is entirely composed of one pipe, and both ends are closed. In addition, an opening (43) through which the high temperature side refrigerant passage (11) communicates with the outside is formed in the upper part of the tube wall of the outer tube (41). Both ends of the inner pipe (42) of the intermediate heat exchanger (40) protrude outward from both ends of the outer pipe (41), and the inner pipe (42) is both ends of both components of the outer pipe (41). It passes through the closing part (41a). Although not shown, a pipe extending from the evaporator (4) is connected to the right end of the inner pipe (42), and a pipe extending to the compressor (1) is connected to the left end of the inner pipe (42).

  The liquid reservoir (45) is formed of a sealed cylindrical body (46) having an open lower end and a closed upper end, and the lower end opening is separated from a liquid phase refrigerant and a gas separated in the liquid reservoir (45). The refrigerant passage port (47) is located below the interface with the phase refrigerant. The lower end of the liquid reservoir (45) is joined to the outer pipe (41) so that the refrigerant passage port (47) and the opening (43) of the outer pipe (41) of the intermediate heat exchanger (40) communicate with each other. Thus, the inside of the high-temperature side refrigerant passage (11) of the intermediate heat exchanger (45) and the refrigerant passage port (47) of the liquid reservoir (45) are communicated with each other.

  The operation of the vehicle air conditioner using the intermediate heat exchanger (40) and the liquid reservoir (45) shown in FIG. 3 is substantially the same as that of the vehicle air conditioner shown in FIG.

  Here, the high-temperature and high-pressure refrigerant sent from the condenser (2) and entering the high-temperature side refrigerant passage (11) of the intermediate heat exchanger (40) from the refrigerant inlet (15) is contained in the high-temperature side refrigerant passage (11). The refrigerant is cooled by the low-temperature and low-pressure refrigerant flowing in the low-temperature side refrigerant passage (12) and enters a supercooled state. The supercooled refrigerant enters the liquid reservoir (45) through the opening (43) of the outer pipe (41) and the refrigerant passage port (47) of the liquid reservoir (45) to enter the liquid phase and gas. Separated into phases. The liquid phase refrigerant in the liquid reservoir (45) passes through the refrigerant passage port (47) of the liquid reservoir (45) and the opening (43) of the outer pipe (41), and is on the high temperature side of the intermediate heat exchanger (40). The refrigerant returns to the refrigerant passage (11) and is sent from the refrigerant outlet (16) to the expansion valve (3).

  Since the refrigerant flowing into the liquid reservoir (45) is in a supercooled state (see state G in FIG. 5), the liquid phase refrigerant in the liquid reservoir (45) is not changed into a gas phase refrigerant. Thus, the liquid phase and the gas phase can be efficiently separated in the liquid reservoir (45). As a result, the entire effective core portion of the condenser (2) can be contributed to the condensation of the refrigerant, and a reduction in the refrigerant condensation efficiency of the condenser (2) can be prevented. In addition, since it is possible to prevent the refrigerant condensation efficiency of the condenser (2) from being lowered, it is not necessary to reduce the amount of refrigerant circulating through the air conditioner, and it is possible to prevent the cooling capacity from being lowered. Further, the refrigerant flowing through the low temperature side refrigerant passage (12) of the intermediate heat exchanger (40) supercools the refrigerant flowing through the high temperature side refrigerant passage (11) and flowing into the liquid reservoir (45). Therefore, the supercooling of the refrigerant does not depend on the fluctuation of the wind speed or the outside air temperature, and a stable degree of supercooling can be obtained.

  The high-temperature and high-pressure refrigerant that has flowed out of the liquid reservoir (45) and entered the high-temperature side refrigerant passage (11) of the intermediate heat exchanger (40) It is further cooled by the low-temperature and low-pressure refrigerant flowing in the refrigerant passage (12), and is subcooled to the state C in FIG. 5 as in the case of the conventional air conditioner shown in FIG.

  Although not shown, a desiccant that removes moisture from the refrigerant and a filter that removes foreign matter in the refrigerant are disposed in the liquid reservoirs (20) and (45) shown in FIGS. Sometimes.

  The air conditioner by this invention is used suitably for the air conditioner mounted in a vehicle.

(1): Compressor
(2): Capacitor
(3): Expansion valve (pressure reducer)
(4): Evaporator
(10): Intermediate heat exchanger
(11): High temperature side refrigerant passage
(11A): Refrigerant inlet side part
(11B): Refrigerant outlet side part
(12): Low temperature side refrigerant passage
(13): Outer pipe
(13A): Left side component
(13B): Right side component
(14): Inner pipe
(15): Refrigerant inlet
(16): Refrigerant outlet
(17): Refrigerant outlet
(18): Refrigerant inlet
(20): Liquid reservoir
(21): Tubular body
(22): Refrigerant inlet
(23): Refrigerant outlet
(32) (33): Communication pipe
(40): Intermediate heat exchanger
(41): Outer pipe
(42): Inner pipe
(43): Opening
(45): Liquid reservoir
(46): Tubular body
(47): Refrigerant passage

Claims (6)

A compressor, a condenser that cools the refrigerant compressed by the compressor, a decompressor that decompresses the refrigerant cooled by the condenser, an evaporator that evaporates the decompressed refrigerant, a high-temperature side refrigerant path, and a low-temperature side refrigerant path An intermediate heat exchanger that exchanges heat between the high-pressure refrigerant flowing out of the condenser and flowing through the high-temperature side refrigerant passage and the low-pressure refrigerant flowing out of the evaporator and flowing through the low-temperature side refrigerant passage, and out of the condenser In an air conditioner that stores a high-pressure refrigerant before being decompressed by a decompressor and includes a liquid reservoir that separates into a liquid phase and a gas phase,
The high temperature side refrigerant passage of the intermediate heat exchanger has a refrigerant inlet and a refrigerant outlet, and the refrigerant enters the liquid reservoir from the intermediate portion between the refrigerant inlet and the refrigerant outlet in the high temperature side refrigerant passage of the intermediate heat exchanger. An air conditioner that enters and returns from the liquid reservoir to the high-temperature side refrigerant passage. The intermediate heat exchanger is a double pipe type including an outer pipe and an inner pipe arranged at intervals in the outer pipe, and a gap between the outer pipe and the inner pipe serves as a high temperature side refrigerant passage. The air conditioner according to claim 1, wherein the inside of the inner pipe is a low-temperature side refrigerant passage. The high temperature side refrigerant passage of the intermediate heat exchanger is divided into a refrigerant inlet side portion and a refrigerant outlet side portion, and the liquid reservoir has a refrigerant inlet and a refrigerant outlet, and the high temperature of the intermediate heat exchanger The refrigerant inlet side portion in the side refrigerant passage and the refrigerant inlet of the liquid reservoir, and the refrigerant outlet side portion in the high temperature side refrigerant passage of the intermediate heat exchanger and the refrigerant outlet of the liquid reservoir are communicated with each other. The air conditioner according to claim 2. The refrigerant inlet side portion and the refrigerant inlet of the liquid reservoir in the high temperature side refrigerant passage of the intermediate heat exchanger, and the refrigerant outlet side portion and the refrigerant outlet of the liquid reservoir in the high temperature side refrigerant passage of the intermediate heat exchanger The air conditioner according to claim 3, wherein one end is joined to the outer pipe of the intermediate heat exchanger, and the other end is communicated via a communication pipe joined to the liquid reservoir. The liquid reservoir has a refrigerant passage port below the interface between the liquid-phase refrigerant and the gas-phase refrigerant formed in the liquid reservoir, and the liquid reservoir is formed between the high-temperature side refrigerant passage of the intermediate heat exchanger and the liquid reservoir. The air conditioner according to claim 2, wherein the air conditioner is communicated with the refrigerant passage. An opening is formed in the outer pipe of the intermediate heat exchanger to allow the high temperature side refrigerant passage to communicate with the outside. The liquid reservoir is formed of a cylindrical body having a lower end opened and an upper end closed, and the lower end opening passes the refrigerant. The air conditioner according to claim 5, wherein the air reservoir is connected to the outer pipe so that the refrigerant reservoir and the opening of the outer pipe of the intermediate heat exchanger communicate with each other.

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