JP2013002774A - Parallel flow type heat exchanger and air conditioner with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side flow system parallel flow type heat exchanger capable of changing a configuration of a refrigerant path between a case of being used as a condenser and a case of being used as an evaporator.SOLUTION: This heat exchanger 1A as the side flow system parallel flow-type heat exchanger, includes vertical header pipes 2, 3, and a plurality of horizontal flat tubes 4 connecting the header pipes 2, 3. The plurality of flat tubes 4 are divided into a plurality of groups configuring the refrigerant paths A, B, C, D by partitioning sections P1, P2, P3 disposed inside of the header pipes 2, 3 when the heat exchanger 1A is used as the condenser. One-way valves UV1, UV2 for releasing a cut-off function of the partitioning sections to the refrigerant flowing direction when the heat exchanger 1A is used as the evaporator, are incorporated in the partitioning sections P1, P3. Thus, the flat tubes 4 are reorganized as refrigerant paths E, F when the heat exchanger 1A is used as the evaporator.

Description

  The present invention relates to a side flow parallel flow heat exchanger and an air conditioner equipped with the heat exchanger.

  A parallel flow type heat exchange in which a plurality of flat tubes are arranged between two header pipes so that a refrigerant passage inside the flat tubes communicates with the header pipe, and fins such as corrugated fins are arranged between the flat tubes. The equipment is widely used in car air conditioners and building air conditioners.

  In parallel flow type heat exchangers, it is often the case that flat tubes are knitted into groups of several by placing partition plates at appropriate positions in the header pipe. The flat tube constitutes a refrigerant path for each group. The partition plate is arranged so that the plurality of refrigerant paths are continuous in a zigzag manner. Examples of such parallel flow heat exchangers can be found in Patent Documents 1 and 2.

  Patent Document 1 describes a side flow type parallel flow heat exchanger including two vertical header pipes and a plurality of horizontal flat tubes connecting the two header pipes. In the heat exchanger of Patent Document 1, a partition plate is inserted into the header pipe through a slit-like opening formed in the header pipe. The partition plate is integrated with the header pipe by brazing.

  Patent Document 2 also describes a side flow type parallel flow heat exchanger. The heat exchanger of Patent Document 2 is characterized by a structure including a plurality of heat exchange units in the vertical direction in which a partition plate is placed in a header pipe.

JP-A-4-254194 JP 2001-91099 A

  The heat exchanger may be used as a condenser or may be used as an evaporator. The refrigerant flows in the opposite direction when used as a condenser and when used as an evaporator. In a parallel flow type heat exchanger of a side flow type, normally, when used as a condenser, the refrigerant flows from the upper refrigerant path to the lower refrigerant path, and when used as an evaporator, the refrigerant flows from the lower refrigerant path to the upper refrigerant path. The refrigerant flows into the refrigerant path.

  In the conventional heat exchanger, the refrigerant flow direction is reversed between the case of being used as a condenser and the case of being used as an evaporator, but the configuration of the refrigerant path has not changed. However, in the side flow type parallel flow heat exchanger, it may be better to change the configuration of the refrigerant path depending on whether it is used as a condenser or as an evaporator.

  The present invention has been made in view of the above points, and in the side flow type parallel flow heat exchanger, the configuration of the refrigerant path can be changed between when used as a condenser and when used as an evaporator. The purpose is to do.

  A parallel flow heat exchanger according to the present invention includes two vertical header pipes and a plurality of horizontal flat tubes connecting the two header pipes, and is disposed in one or both of the header pipes. The partition portion divides the plurality of flat tubes into a plurality of groups constituting different refrigerant paths, and a predetermined one of the partition portions has a blocking function of the partition portion with respect to a specific refrigerant flow direction. Combined with one-way valve to release.

  In the parallel flow heat exchanger having the above-described configuration, it is preferable that the one-way valve is incorporated in the partition part or forms a detour of the partition part.

  In the parallel flow heat exchanger configured as described above, the specific refrigerant flow direction is preferably a refrigerant flow direction when the parallel flow heat exchanger is used as an evaporator.

  In the parallel flow heat exchanger having the above-described configuration, it is preferable that the uppermost refrigerant path includes a larger number of the flat tubes.

  In the parallel flow heat exchanger configured as described above, a check valve or a solenoid valve is preferably used as the one-way valve.

  According to the present invention, the parallel flow heat exchanger configured as described above is mounted on an indoor unit or an outdoor unit of an air conditioner.

  According to the present invention, since the one-way valve for canceling the blocking function of the partitioning part for a specific refrigerant flow direction is combined with a predetermined one of the partitioning parts inside the header pipe, the configuration of the refrigerant path according to the refrigerant flow direction Changes. As a result, when the parallel flow type heat exchanger is used as a condenser, the refrigerant path configuration is suitable as a condenser, and when the parallel flow type heat exchanger is used as an evaporator, the refrigerant path configuration is suitable as an evaporator. Can be increased.

It is sectional drawing which looked at the heat exchanger which concerns on 1st Embodiment of this invention from the front. FIG. 2 is a vertical cross-sectional view of a heat exchanger cut along a line II-II in FIG. 1. In the heat exchanger which concerns on 1st Embodiment of this invention, it is sectional drawing which shows the case where a refrigerant | coolant flow direction is reversed. It is sectional drawing which looked at the heat exchanger which concerns on 2nd Embodiment of this invention from the front. In the heat exchanger which concerns on 2nd Embodiment of this invention, it is sectional drawing which shows the case where a refrigerant | coolant flow direction is reversed. It is sectional drawing similar to FIG. 1 which shows the deformation | transformation aspect of 1st Embodiment of this invention. FIG. 7 is a cross-sectional view showing a case where the refrigerant flow direction is reversed in the heat exchanger of FIG. 6. It is sectional drawing similar to FIG. 4 which shows the deformation | transformation aspect of 2nd Embodiment of this invention. FIG. 9 is a cross-sectional view showing a case where the refrigerant flow direction is reversed in the heat exchanger of FIG. 8. It is a schematic block diagram of the air conditioner carrying the heat exchanger which concerns on this invention, and shows the state at the time of heating operation. It is a schematic block diagram of the air conditioner carrying the heat exchanger which concerns on this invention, and shows the state at the time of air_conditionaing | cooling operation.

  The structure of the side flow parallel flow heat exchanger according to the first embodiment of the present invention will be described with reference to FIG. In FIG. 1, the upper side of the paper is the upper side of the heat exchanger, and the lower side of the paper is the lower side of the heat exchanger.

  A heat exchanger 1A which is a parallel flow type heat exchanger according to the first embodiment is a side flow type, and includes two vertical header pipes 2 and 3 and a plurality of horizontal flat tubes 4 arranged therebetween. . The header pipes 2 and 3 are arranged in parallel in the horizontal direction at intervals, and the flat tubes 4 are arranged at a predetermined pitch in the vertical direction. At the stage of actually mounting on the equipment, the heat exchanger 1A is installed at various angles according to the request of the design, and therefore “vertical direction” and “horizontal direction” in this specification should not be strictly interpreted. It should be understood as a mere measure of direction.

  The flat tube 4 is an elongated molded product obtained by extruding a metal, and as shown in FIG. 2, a refrigerant passage 5 through which a refrigerant flows is formed. Since the flat tube 4 is disposed so that the extrusion direction, which is the longitudinal direction, is horizontal, the refrigerant flow direction of the refrigerant passage 5 is also horizontal. A plurality of refrigerant passages 4 having the same cross-sectional shape and cross-sectional area are arranged in the left-right direction in FIG. 2, and therefore the vertical cross section of the flat tube 4 has a harmonica shape. Each refrigerant passage 5 communicates with the inside of the header pipes 2 and 3.

  Corrugated fins 6 are arranged between the adjacent flat tubes 4. Of the corrugated fins 6 arranged in the vertical direction, side plates 7 are arranged outside the uppermost and lowermost ones.

  The header pipes 2 and 3, the flat tubes 4, the corrugated fins 6, and the side plates 7 are all made of a metal having good heat conductivity such as aluminum. The flat tubes 4 are the flat tubes 4 with respect to the header pipes 2 and 3. On the other hand, the side plate 7 is fixed to the corrugated fin 6 by brazing or welding, respectively.

  The inside of the header pipe 2 is partitioned into three sections S1, S2, and S3 by two partition portions P1 and P2. The partition parts P1 and P2 divide the plurality of flat tubes 4 into a plurality of flat tube groups. A flat tube group consisting of four of the total 24 flat tubes 4 is connected to the section S1, a flat tube group consisting of 15 flat tubes 4 is connected to the section S2, and five flat tubes groups are connected to the section S3. A flat tube group consisting of the flat tubes 4 is connected.

  The inside of the header pipe 3 is partitioned into two sections S4 and S5 by one partition part P3. The partition part P3 divides the plurality of flat tubes 4 into a plurality of flat tube groups. A flat tube group consisting of 12 out of a total of 24 flat tubes 4 is connected to the section S4, and a flat tube group consisting of 12 flat tubes 4 is also connected to the section S5.

  The total number of the flat tubes 4 described above, the number of partition portions inside each header pipe and the number of partitions partitioned thereby, and the number of flat tubes 4 for each flat tube group divided by the partition portions are merely examples. Yes, it does not limit the invention. The same applies to the other embodiments.

  A refrigerant inlet / outlet pipe 8 is connected to the section S1. A refrigerant inlet / outlet pipe 9 is connected to the section S3.

  A predetermined one of the partitions P1, P2, and P3 is combined with a one-way valve that releases the blocking function of the partition with respect to a specific refrigerant flow direction. In 1st Embodiment, partition part P1, P3 is made into the object which combines a one-way valve. The partition part P2 is a simple partition plate having only a blocking function.

  A one-way valve UV1 is incorporated in the partition portion P1, and a one-way valve UV2 is incorporated in the partition portion P3. The one-way valves UV1 and UV2 block the refrigerant flow that tends to flow from the top to the bottom inside the header pipes 2 and 3, that is, the refrigerant flow when the heat exchanger 1A is used as a condenser.

  On the other hand, the one-way valves UV1 and UV2 do not block the refrigerant flow that tends to flow from the bottom up in the header pipes 2 and 3, that is, the refrigerant flow when the heat exchanger 1A is used as an evaporator. Thereby, the partition parts P1 and P3 lose the blocking function.

  The function of the heat exchanger 1A is as follows. When the heat exchanger 1A is used as a condenser, the refrigerant is supplied to the section S1 through the refrigerant inlet / outlet pipe 8. The refrigerant that has entered the compartment S1 travels through the four flat tubes 4 connecting the compartment S1 and the compartment S4 to the compartment S4. The flat tube group formed by the four flat tubes 4 constitutes the refrigerant path A. The refrigerant path A is symbolized by a block arrow. Other refrigerant paths are also symbolized by block arrows.

  The refrigerant that has entered the compartment S4 turns back there, and travels through the eight flat tubes 4 that connect the compartment S4 and the compartment S2 to the compartment S2. The flat tube group formed by the eight flat tubes 4 constitutes the refrigerant path B.

  The refrigerant that has entered the compartment S2 turns back there, and travels through the seven flat tubes 4 connecting the compartment S2 and the compartment S5 to the compartment S5. The flat tube group formed by the seven flat tubes 4 constitutes the refrigerant path C.

  The refrigerant that has entered the compartment S5 turns back there, and travels to the compartment S3 through the five flat tubes 4 that connect the compartment S5 and the compartment S3. The flat tube group formed by the five flat tubes 4 constitutes the refrigerant path D. The refrigerant entering the section S3 flows out from the refrigerant inlet / outlet pipe 9.

  When the heat exchanger 1A is used as an evaporator, the refrigerant is supplied to the section S3 through the refrigerant inlet / outlet pipe 9 as shown in FIG. The flow of the refrigerant thereafter does not follow the refrigerant path when the heat exchanger 1A is used as a condenser, but passes through another refrigerant path.

  The refrigerant that has entered the compartment S3 travels to the compartment S5 through the five flat tubes 4 that connect the compartment S3 and the compartment S5. The flat tube group formed by the five flat tubes 4 constitutes the refrigerant path E. The refrigerant path E is a refrigerant path when the refrigerant flows in the reverse direction through the refrigerant path D when the heat exchanger 1A is used as a condenser.

  The refrigerant that has entered the compartment S5 flows through the header pipe 3 from the bottom to the top. Since the refrigerant flow in this direction is not blocked by the one-way valve UV2, it is as if the sections S5 and S4 are connected to one another.

  Even inside the header pipe 2, the refrigerant that has entered the compartment S2 flows from the bottom to the top. Since the refrigerant flow in this direction is not blocked by the one-way valve UV1, it is as if the section S2 and the section S1 are connected to each other.

  In the header pipe 3, the section S5 and the section S4 are connected to each other, and in the header pipe 2, the section S2 and the section S1 are connected to each other. As a result, the flat tubes 4 that connect the sections S5 and S4 and the sections S2 and S1, that is, heat exchange A total of 19 flat tubes 4 constituting the refrigerant path C, the refrigerant path B, and the refrigerant path A when the vessel 1A is used as a condenser form a group, and the header pipe 3 is changed to the header pipe 2. A refrigerant path F through which the refrigerant flows is formed.

  As a result, when the heat exchanger 1A is used as a condenser, the refrigerant entering from the refrigerant inlet / outlet pipe 8 follows the long path from the refrigerant path A → refrigerant path B → refrigerant path C → refrigerant path D. It will come out of the pipe 9. Such a refrigerant path configuration is appropriate for condensing a gaseous refrigerant.

  When the heat exchanger 1A is used as an evaporator, the refrigerant entering from the refrigerant inlet / outlet pipe 9 follows the refrigerant path E → refrigerant path F, and then exits from the refrigerant inlet / outlet pipe 8. The heat exchanger 1A is susceptible to pressure loss when used as an evaporator. If the refrigerant path is shortened, the pressure loss is reduced. Therefore, such a refrigerant path configuration is appropriate when the heat exchanger 1A is used as an evaporator.

  As the one-way valves UV1 and UV2, check valves can be used. Alternatively, electromagnetic valves can be used as the one-way valves UV1 and UV2. The solenoid valve is controlled to be closed when the heat exchanger 1A is used as a condenser and to be opened when the heat exchanger 1A is used as an evaporator.

  FIG. 4 shows the structure of a side flow type parallel flow heat exchanger according to the second embodiment of the present invention. Components that are functionally common to the components of the first embodiment are denoted by the same reference numerals as those used in the first embodiment, and description thereof is omitted.

  In the heat exchanger 1B that is the parallel flow heat exchanger of the second embodiment, no one-way valve is incorporated in the partition portions P1 and P3. The partition parts P1 and P3 are mere partition plates having only a blocking function, like the partition part P2.

  The section S1 and the section S2 are connected by a bypass pipe 10. A one-way valve UV <b> 3 is arranged in the middle of the bypass pipe 10. The one-way valve UV3 forms a bypass circuit of the partition portion P1 together with the bypass pipe 10. The one-way valve UV3 blocks the refrigerant flow from the section S1 to the section S2, but does not block the refrigerant flow from the section S2 to the section S1.

  The section S4 and the section S5 are connected by a bypass pipe 11. A one-way valve UV <b> 4 is disposed in the middle of the bypass pipe 11. The one-way valve UV4 forms a bypass circuit of the partition part P3 together with the bypass pipe 11. The one-way valve UV4 blocks the refrigerant flow from the section S4 to the section S5, but does not block the refrigerant flow from the section S5 to the section S4.

  The function of the heat exchanger 1B is as follows. When the heat exchanger 1B is used as a condenser, the refrigerant is supplied to the section S1 through the refrigerant inlet / outlet pipe 8. The refrigerant entering the section S1 enters the section S3 along the path of the refrigerant path A → refrigerant path B → refrigerant path C → refrigerant path D, and flows out from the refrigerant inlet / outlet pipe 9.

  When the heat exchanger 1B is used as an evaporator, the refrigerant is supplied to the section 3 through the refrigerant inlet / outlet pipe 9 as shown in FIG. The refrigerant that has entered the compartment 3 passes through the refrigerant path E and enters the compartment S5.

  The refrigerant that has entered the compartment S5 flows from the bottom to the top in the header pipe 3 and tries to flow in the bypass pipe 11 toward the compartment S4. Since the refrigerant flow in this direction is not blocked by the one-way valve UV4, it is as if the sections S5 and S4 are connected to one another.

  Even in the header pipe 2, the refrigerant that has entered the section S <b> 2 flows from the bottom to the top, and tends to flow in the detour pipe 10 toward the section S <b> 1. Since the refrigerant flow in this direction is not blocked by the one-way valve UV3, it is as if the section S2 and the section S1 are connected to each other.

  As a result, a total of 19 flat tubes 4 connecting the sections S5 and S4 and the sections S2 and S1 form one group, and form a refrigerant path F through which the refrigerant flows from the header pipe 3 to the header pipe 2.

  Thus, when the heat exchanger 1B is used as a condenser, the refrigerant entering from the refrigerant inlet / outlet pipe 8 condenses the gaseous refrigerant in the refrigerant path A → refrigerant path B → refrigerant path C → refrigerant path D. The refrigerant enters and exits the pipe 9 through a long path suitable for the above. When the heat exchanger 1B is used as an evaporator, the refrigerant entering from the refrigerant inlet / outlet pipe 9 follows the refrigerant path E → refrigerant path F and a short path suitable for evaporating the liquid refrigerant, and the refrigerant inlet / outlet pipe. Get out of 8.

  As the one-way valves UV3 and UV4, check valves can be used. Alternatively, electromagnetic valves can be used as the one-way valves UV3 and UV4. The solenoid valve is controlled to be closed when the heat exchanger 1B is used as a condenser and to be opened when the heat exchanger 1B is used as an evaporator.

  The first embodiment and the second embodiment are not in an exclusive relationship. In one heat exchanger, a structure in which a one-way valve is incorporated in a partition part at a certain place may be adopted, and a structure in which the one-way valve forms a bypass of the partition part may be adopted at a different place.

  A modification of the first embodiment is shown in FIG. The heat exchanger 1A ′ in FIG. 6 is different from the heat exchanger 1A in FIG. 1 in the number of flat tubes 4 constituting the refrigerant path. In the heat exchanger 1A ′, the refrigerant path A is composed of eight flat tubes 4, the refrigerant path B is composed of seven flat tubes 4, and the refrigerant path C is composed of five flat tubes 4. The path D is composed of four flat tubes 4. That is, the upper refrigerant path includes a larger number of flat tubes 4. Thereby, when heat exchanger 1A 'is used as a condenser, the reduction | decrease in the volume of a refrigerant | coolant and the reduction | decrease of a refrigerant | coolant flow path area will be commensurate, and a refrigerant | coolant can be condensed efficiently.

  When the heat exchanger 1A ′ is used as an evaporator, the refrigerant path E is configured by the four flat tubes 4 and the refrigerant path F is configured by the 20 flat tubes 4 as shown in FIG. Become.

  A modification of the second embodiment is shown in FIG. 8 is also different from the heat exchanger 1B in FIG. 4 in the number of flat tubes 4 constituting the refrigerant path. In the heat exchanger 1B ′, the refrigerant path A is composed of eight flat tubes 4, the refrigerant path B is composed of seven flat tubes 4, and the refrigerant path C is composed of five flat tubes 4. The path D is composed of four flat tubes 4. That is, the upper refrigerant path includes a larger number of flat tubes 4. Thereby, when heat exchanger 1B 'is used as a condenser, the reduction | decrease of the volume of a refrigerant | coolant and the reduction | decrease of a refrigerant | coolant flow path area will be commensurate, and a refrigerant | coolant can be condensed efficiently.

  When the heat exchanger 1B ′ is used as an evaporator, as shown in FIG. 9, the refrigerant path E is constituted by four flat tubes 4, and the refrigerant path F is constituted by 20 flat tubes 4. Become.

  In the first embodiment and the second embodiment, and in the modified embodiment of the first embodiment and the modified embodiment of the second embodiment, the number of refrigerant paths is increased when used as a condenser, and the refrigerant is used when used as an evaporator. Although the number of paths is reduced, this configuration is not absolute. If it is an optimum configuration, conversely, the number of refrigerant paths may be reduced when used as a condenser, and the number of refrigerant paths may be increased when used as an evaporator.

  Heat exchanger 1A, 1B, 1A ', 1B' can be mounted in a separate type air conditioner. A separate type air conditioner is composed of an outdoor unit and an indoor unit. The outdoor unit includes a compressor, a four-way valve, an expansion valve, an outdoor heat exchanger, an outdoor fan, and the like. The indoor unit is an indoor heat exchanger, a room Includes an internal blower. The outdoor heat exchanger functions as an evaporator during heating operation and functions as a condenser during cooling operation. The indoor heat exchanger functions as a condenser during heating operation and functions as an evaporator during cooling operation.

  FIG. 10 shows a basic configuration of a separate type air conditioner that uses a heat pump cycle as a refrigeration cycle. The heat pump cycle 101 includes a compressor 102, a four-way valve 103, an outdoor heat exchanger 104, a decompression / expansion device 105, and an indoor heat exchanger 106 connected in a loop. The compressor 102, the four-way valve 103, the heat exchanger 104, and the decompression / expansion device 105 are accommodated in the casing of the outdoor unit, and the heat exchanger 106 is accommodated in the casing of the indoor unit. An outdoor fan 107 is combined with the heat exchanger 104, and an indoor fan 108 is combined with the heat exchanger 106. The blower 107 includes a propeller fan, and the blower 108 includes a cross flow fan.

  Heat exchanger 1A, 1B, 1A ', 1B' can be used as a component of the heat exchanger 106 of an indoor unit. The heat exchanger 106 is a combination of three heat exchangers 106A, 106B, and 106C like a roof that covers the blower 108, and any one of the heat exchangers 106A, 106B, and 106C is replaced with the heat exchangers 1A and 1B. 1A ′ or 1B ′.

  FIG. 10 shows a state during heating operation. At this time, the high-temperature and high-pressure refrigerant discharged from the compressor 102 enters the indoor heat exchanger 106 where it dissipates heat and condenses. The refrigerant exiting the heat exchanger 106 enters the outdoor heat exchanger 104 from the decompression / expansion device 105 and expands there, takes heat from the outdoor air, and returns to the compressor 102. The airflow generated by the indoor fan 108 promotes heat dissipation from the heat exchanger 106, and the airflow generated by the outdoor fan 107 accelerates heat absorption of the heat exchanger 104.

  FIG. 11 shows a state during cooling operation or defrosting operation. At this time, the four-way valve 103 is switched so that the refrigerant flow is reversed from that during the heating operation. That is, the high-temperature and high-pressure refrigerant discharged from the compressor 102 enters the outdoor heat exchanger 104, where it dissipates heat and condenses. The refrigerant exiting the heat exchanger 104 enters the heat exchanger 106 on the indoor side from the decompression / expansion device 105 and expands there, takes heat from indoor air, and returns to the compressor 102. The airflow generated by the outdoor fan 107 promotes heat dissipation from the heat exchanger 104, and the airflow generated by the indoor fan 108 promotes heat absorption of the heat exchanger 106.

  The heat exchangers 1A, 1B, 1A ′, 1B ′ can also be used as the heat exchanger 104 of the outdoor unit.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

  The present invention is widely applicable to side flow parallel flow heat exchangers.

1A, 1B, 1A ′, 1B ′ Heat exchanger 2, 3 Header pipe 4 Flat tube 5 Refrigerant passage 6 Corrugated fin 7 Side plate 8, 9 Refrigerant inlet / outlet pipe 10, 11 Detour pipe P1, P2, P3, P4 Partition section S1 , S2, S3, S4, S5 Compartment A, B, C, D, E, F Refrigerant path UV1, UV2, UV3, UV4 One-way valve

Claims (6)

In a parallel flow type heat exchanger of a side flow type comprising two vertical header pipes and a plurality of horizontal flat tubes connecting the two header pipes,
The plurality of flat tubes are divided into a plurality of groups constituting different refrigerant paths by a partition portion arranged inside one or both of the header pipes, and specified as a predetermined one of the partition portions. A parallel flow heat exchanger, which is combined with a one-way valve that releases the blocking function of the partitioning portion in the refrigerant flow direction.   The parallel flow heat exchanger according to claim 1, wherein the one-way valve is incorporated in the partition part or forms a detour of the partition part.   The parallel flow heat exchanger according to claim 1 or 2, wherein the specific refrigerant flow direction is a refrigerant flow direction when the parallel flow heat exchanger is used as an evaporator.   The parallel flow type heat exchanger according to any one of claims 1 to 3, wherein a higher number of the flattened tubes is included in a higher one of the refrigerant paths.   The parallel flow heat exchanger according to any one of claims 1 to 4, wherein a check valve or a solenoid valve is used as the one-way valve.   An air conditioner in which the parallel flow heat exchanger according to any one of claims 1 to 5 is mounted on an indoor unit or an outdoor unit.

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