CN211926198U - Heat Exchangers and Air Conditioners - Google Patents

Abstract

The utility model relates to a heat exchanger and air conditioner, heat exchanger possesses: a heat exchanger main body having a plurality of fins, and a hollow round tube and a flat tube through which a fluid passes; and side plates provided at both ends of the plurality of fins and having side circular holes into which the circular tubes are inserted, the circular tubes being mechanically fixed to the side circular holes of the side plates.

Description

Heat Exchangers and Air Conditioners

technical field

The utility model relates to a heat exchanger and an air conditioner provided with a hollow circular tube through which fluid passes and a hollow flat tube through which fluid passes.

Background technique

The heat exchanger is used in a refrigerant circuit such as a refrigeration apparatus, an air conditioner, or a heat pump, and is configured such that a plurality of fins arranged at intervals have a heat transfer tube pierced therethrough. The heat transfer tubes are provided in multiple layers in the direction intersecting with the flow of the air, and the rows of the heat transfer tubes composed of the multiple layers are arranged in a plurality of rows along the flow direction of the air. As such a heat exchanger, Patent Document 1 discloses a heat exchanger using a flat tube having a flat cross section of the heat transfer tube. In Patent Document 1, the unit for accommodating the heat exchanger and the side plate for fixing the heat exchanger are fixed to the flat tube of the heat exchanger by brazing.

Patent Document 1: Japanese Patent No. 5404729

However, when fixing the side plate to the flat tube by brazing as in Patent Document 1, it is necessary to secure a gap required for brazing between the hole of the side plate and the flat tube. This is because when the clearance is small, it becomes difficult to attach the side plate. Therefore, when brazing the side plate and the flat tube, high dimensional accuracy is required.

Utility model content

The present invention is made in order to solve the above-mentioned problems, and provides a heat exchanger, an air conditioner, and a method for manufacturing a heat exchanger in which a side plate can be easily fixed to a heat exchanger main body in which a tube row is formed at low cost. .

The heat exchanger of the present invention includes: a heat exchanger main body having a plurality of fins and a hollow circular tube and a flat tube through which fluid passes; and side plates arranged at both ends of the plurality of fins to form There is a side circular hole into which the round tube is inserted, the round tube is mechanically fixed to the side circular hole of the side plate, the side plate is formed with a side flat hole into which the flat tube is inserted, and the fin is formed with a side hole for insertion of the flat tube. For the flat insertion hole, the length of the short axis direction of the flat tube and the length of the short axis direction of the flat insertion hole are shorter than the length of the short axis direction of the side flat hole, and the side plate is separated from the flat tube.

Preferably, the side plates are not in contact with the flat tubes.

Preferably, the size of the side flat holes of the side plate is larger than the size of the flat tubes.

Preferably, the circular pipe is fixed to the side circular hole of the side plate by expanding the pipe.

Preferably, the round tube and the flat tube have brazed portions that are in close contact with the fins.

Preferably, the flat tube is a porous tube whose interior is divided into a plurality of flow paths.

Preferably, the heat exchanger main body is provided with a plurality of rows of the round tubes and the flat tubes in a direction orthogonal to the layer direction.

Preferably, the circular tube is arranged at the end of the layer direction.

Preferably, the side panels are arranged in each row.

Preferably, the circular tube is elliptical in shape.

Preferably, the side panels are constructed of aluminium or stainless steel.

The air conditioner of the present invention includes a refrigerant circuit in which a compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are connected by refrigerant piping, and the above-mentioned heat exchanger is used as the outdoor heat exchanger or the indoor heat exchanger. heat exchanger.

According to the present invention, the side plate and the round pipe are mechanically fixed. Therefore, on the basis of fixing the heat exchanger body and the side plates, brazing is not required. Therefore, when manufacturing the heat exchanger, high dimensional accuracy is not required. Therefore, it is possible to inexpensively attach the side plate to the heat exchanger body without providing additional components or the like.

Description of drawings

FIG. 1 is a circuit diagram showing an air conditioner 100 according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing the heat exchanger 50 according to Embodiment 1 of the present invention.

FIG. 3 is a front view showing the heat exchanger 50 according to Embodiment 1 of the present invention.

4 : is a side view which shows the fin 15 in Embodiment 1 of this invention.

FIG. 5 is a cross-sectional view showing the side plate 19 in Embodiment 1 of the present invention.

6 : is a figure which shows the flat tube 14 in Embodiment 1 of this invention.

7 : is a figure which shows the manufacturing method of the heat exchanger 50 which concerns on Embodiment 1 of this invention.

8 : is a figure which shows the manufacturing method of the heat exchanger 50 which concerns on Embodiment 1 of this invention.

9 : is a figure which shows the manufacturing method of the heat exchanger 50 which concerns on Embodiment 1 of this invention.

FIG. 10 is a diagram showing a method of manufacturing the heat exchanger 50 according to Embodiment 1 of the present invention.

Fig. 11 is a side view showing side plates 26a and 26b in Embodiment 2 of the present invention.

FIG. 12 is a side view showing the side plate 19 in Embodiment 3 of the present invention.

Detailed ways

Embodiment 1

Hereinafter, embodiments of the heat exchanger, the air conditioner, and the manufacturing method of the heat exchanger of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing an air conditioner 100 according to Embodiment 1 of the present invention. The air conditioner 100 will be described based on this FIG. 1 . As shown in FIG. 1 , the air conditioner 100 includes an outdoor unit 8 and an indoor unit 7 . A gas-side inside/outside connecting valve 9 and a liquid-side inside/outside connecting valve 10 are provided at the portion connected to the outdoor unit 8 and the indoor unit 7 . The gas-side internal/external connection valve 9 is provided in the refrigerant pipe 6 through which the gas refrigerant mainly flows, and adjusts the flow rate of the gas refrigerant flowing in the refrigerant pipe 6 . The liquid-side internal/external connection valve 10 is provided in the refrigerant pipe 6 mainly through which the liquid refrigerant flows, and adjusts the flow rate of the liquid refrigerant flowing in the refrigerant pipe 6 . In addition, in this Embodiment 1, the case where the fluid which flows in the refrigerant|coolant piping 6 is a refrigerant|coolant was illustrated, but the fluid may be a heat medium.

The outdoor unit 8 is installed outdoors, and includes a compressor 1 , a flow-path switching unit 2 , an outdoor heat exchanger 3 , an outdoor blower 11 , and a pressure reducer 4 . The indoor unit 7 is installed indoors, and includes an indoor heat exchanger 5 and an indoor blower 12 . Here, the compressor 1 , the flow switching unit 2 , the outdoor heat exchanger 3 , the decompressor 4 , and the indoor heat exchanger 5 are connected by a refrigerant pipe 6 to constitute a refrigerant circuit.

The compressor 1 sucks a refrigerant in a low-temperature and low-pressure state, compresses the sucked refrigerant into a refrigerant in a high-temperature and high-pressure state, and discharges it. The compressor 1 is constituted by, for example, a capacity-controlled inverter compressor. The flow-path switching unit 2 switches the direction in which the refrigerant flows in the refrigerant circuit, and is, for example, a four-way valve. The outdoor heat exchanger 3 performs heat exchange between the outdoor air and the refrigerant, and is composed of, for example, a fin-and-tube heat exchanger. The outdoor heat exchanger 3 functions as a condenser during cooling operation, and functions as an evaporator during heating operation. The outdoor fan 11 sends outdoor air to the outdoor heat exchanger 3 . The decompressor 4 is a decompression valve or an expansion valve that decompresses and expands the refrigerant. The pressure reducer 4 is, for example, an electronic expansion valve whose opening degree is adjusted.

The indoor heat exchanger 5 performs heat exchange between indoor air and the refrigerant, and is composed of, for example, a fin-and-tube heat exchanger. The indoor heat exchanger 5 functions as an evaporator during cooling operation, and functions as a condenser during heating operation. The indoor air blower 12 is installed in the vicinity of the indoor heat exchanger 5 , and is a device that sends indoor air to the indoor heat exchanger 5 .

Next, the operation mode of the air conditioner 100 will be described. First, the cooling operation will be described. In the cooling operation, the refrigerant sucked into the compressor 1 is compressed by the compressor 1 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 passes through the flow-path switching unit 2 and flows into the outdoor heat exchanger 3 functioning as a condenser. The air is condensed and liquefied by heat exchange. The condensed refrigerant in a liquid state flows into the decompressor 4 , and is expanded and decompressed in the decompressor 4 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant.

The refrigerant in a gas-liquid two-phase state flows into the indoor heat exchanger 5 functioning as an evaporator through the liquid-side inner and outer connecting valve 10, and is evaporated and vaporized by heat exchange with indoor air in the indoor heat exchanger 5. At this time, the indoor air is cooled, and cooling is performed in the room. The evaporated low-temperature and low-pressure gaseous refrigerant is sucked into the compressor 1 through the gas-side internal/external connection valve 9 and the flow-path switching unit 2 .

Next, the heating operation will be described. During the heating operation, the refrigerant sucked into the compressor 1 is compressed by the compressor 1 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 flows into the indoor heat exchanger 5 functioning as a condenser through the flow-path switching unit 2 and the gas-side internal/external connection valve 9 , and is transported in the indoor heat exchanger 5 with the refrigerant. The indoor air to the indoor air blower 12 is condensed and liquefied by heat exchange. At this time, indoor air is heated, and heating is performed in the room.

The condensed liquid refrigerant flows into the decompressor 4 through the liquid-side internal and external connection valve 10 , and is expanded and decompressed in the decompressor 4 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant. Then, the refrigerant in the gas-liquid two-phase state flows into the outdoor heat exchanger 3 that functions as an evaporator, and exchanges heat with the outdoor air in the outdoor heat exchanger 3 to evaporate and gasify. The evaporated low-temperature and low-pressure gaseous refrigerant is sucked into the compressor 1 through the flow-path switching unit 2 .

FIG. 2 is a perspective view showing the heat exchanger 50 according to Embodiment 1 of the present invention, and FIG. 3 is a front view showing the heat exchanger 50 according to Embodiment 1 of the present invention. Next, the heat exchanger 50 used as the outdoor heat exchanger 3 or the indoor heat exchanger 5 will be described in detail. As shown in Figs. 2 and 3 , the heat exchanger 50 includes a heat exchanger body 16, side plates 19, an elbow 17, and header pipes 18a and 18b. The heat exchanger main body 16 has round tubes 13 , flat tubes 14 , and fins 15 . Here, the round tube 13 and the flat tube 14 have brazed portions that are in close contact with the fins 15 by brazing. In addition, the portion of the fins 15 into which the circular tubes 13 and the flat tubes 14 of the first row are inserted is referred to as a first heat exchange core 16a, and the portion of the fins 15 into which the circular tubes 13 and the flat tubes of the second row are inserted is referred to as a first heat exchange core 16a. The portion of 14 is referred to as the second heat exchange core 16b. The heat exchanger main body 16 is accommodated in a storage unit (not shown).

In the heat exchanger main body 16, the round tubes 13 and the flat tubes 14 are provided in multiple layers in one direction (layer direction), and the round tubes 13 and the flat tubes 14 are arranged in the orthogonal direction (row direction) in one direction. Set up multiple columns. In Embodiment 1, the circular tubes 13 are provided in two layers at the upper ends of the fins 15 , and the flat tubes 14 are provided in eight layers below the circular tubes 13 . In addition, the round tubes 13 and the flat tubes 14 are provided in two rows, and are arranged in a staggered manner with respect to the row direction. The circular tube 13 is a hollow and perfectly circular tube through which the fluid passes, and a plurality of them are provided. The flat tube 14 is a hollow and flat tube through which a fluid passes, and is a porous tube whose inside is divided into a plurality of flow paths. A plurality of flat tubes 14 are also provided.

4 : is a side view which shows the fin 15 in Embodiment 1 of this invention. As shown in FIGS. 2 and 4 , the fins 15 are plate-shaped members into which the round tubes 13 and the flat tubes 14 are inserted, and a plurality of them are arranged in parallel, respectively. The fins 15 are arranged so as to be orthogonal to the circular tubes 13 and the flat tubes 14 . A circular through hole 20 and a flat insertion hole 21 are formed in the fin 15 . The circular through hole 20 is a hole into which the circular tube 13 is inserted, and is formed in the upper portion of the fin 15 . The flat insertion hole 21 is a comb-shaped hole into which the flat tube 14 is inserted, and is formed in the lower portion of the fin 15.

5 : is sectional drawing which shows the side plate 19 in Embodiment 1 of this invention, and is A-A sectional drawing of FIG. 3. FIG. As shown in FIGS. 2 and 5 , the side plate 19 is a plate-shaped member that fixes the heat exchanger body 16 to a storage unit (not shown) in which the heat exchanger body 16 is accommodated. The side plates 19 are arranged outside the fins 15 at both ends of the heat exchanger body 16 among the fins 15 in which the round tubes 13 and the flat tubes 14 are inserted, and connect the first heat exchange core 16a and the second heat exchange core 16b. The side plate 19 is made of aluminum, for example. A side circular hole 22 and a side flat hole 23 are formed in the side plate 19 . The side circular hole 22 is a hole into which the circular tube 13 is inserted, and is formed in the upper portion of the side plate 19 . The side flat hole 23 is a hole into which the flat tube 14 is inserted, and is formed in the lower portion of the side circular hole 22 .

Here, the circular tube 13 is inserted into the side circular hole 22 and is directly mechanically fixed. For example, the circular pipe 13 is expanded while being inserted into the side circular hole 22, so that the outer peripheral portion of the circular pipe 13 and the inner peripheral portion of the side circular hole 22 are in close contact with each other. The flat tube 14 is inserted into the side flat hole 23 . In addition, the flat tube 14 may be fixed to the side plate 19 by brazing, and may not be brazed. Usually, the flat tubes 14 are not in contact with the side plates 19 because the flat tubes 14 are difficult to expand. That is, the size of the side flat hole 23 of the side plate 19 is larger than the size of the flat tube 14. Moreover, the side plate 19 has the fixing|fixed part 24 in an upper end part and a lower end part. The fixing portion 24 is a portion attached to the storage unit.

6 : is a figure which shows the flat tube 14 in Embodiment 1 of this invention, and is the enlarged view which looked at the part enclosed by the dotted line of FIG. 5 from the lamination longitudinal direction. As shown in FIG. 6 , the length 14 a in the short-axis direction of the flat tube 14 is shorter than the length 21 a in the short-axis direction of the flat insertion hole 21 . In addition, the length 21 a in the short axis direction of the flat insertion hole 21 is shorter than the length 23 a in the short axis direction of the side flat hole 23 . That is, the dimension in the short axis direction satisfies the relationship of 14a<23a and 21a<23a. In this way, the side plates 19 are separated from the flat tubes 14 without contacting. In addition, as described above, the flat tubes 14 are in close contact with the fins 15 by brazing.

As shown in FIG. 2 , the elbow 17 is, for example, a U-shaped member that connects the round pipes 13 to each other. The header pipes 18a and 18b are connected to the round tubes 13 and the flat tubes 14, distribute the fluids flowing in the round tubes 13 and the flat tubes 14, and confluence the fluids flowing in the round tubes 13 and the flat tubes 14. . The header pipes 18a and 18b are respectively connected to the first heat exchange core 16a and the second heat exchange core 16b one by one.

7-10 is a figure which shows the manufacturing method of the heat exchanger 50 which concerns on Embodiment 1 of this invention. Next, the manufacturing method of the heat exchanger 50 is demonstrated. First, as shown in FIG. 7 , the stamped fins 15 are sandwiched by the side plates 19 and stacked. Next, as shown in FIG. 8 , the circular tubes 13 are inserted into the side circular holes 22 of the side plates 19 and the circular through holes 20 of the fins 15 , and the circular tubes 13 and the side plates 19 are mechanically closely connected. Specifically, by mechanically expanding the circular pipe 13 , the outer peripheral portion of the circular pipe 13 is in close contact with the inner peripheral portion of the side circular hole 22 and the circular through hole 20 .

Then, the flat tubes 14 are inserted into the flat insertion holes 21 of the fins 15 and the side flat holes 23 of the side plates 19, which are in close contact with the circular tubes 13 and fixed. Then, by performing furnace brazing, the round tube 13, the flat tube 14, the fins 15, and the side plates 19 are brazed. Then, as shown in FIG. 10, the heat exchanger 50 is completed by brazing the elbow 17 and the header pipes 18a and 18b by hand.

According to the first embodiment, the side plate 19 and the round pipe 13 are mechanically fixed. Therefore, on the basis of fixing the heat exchanger main body 16 and the side plate 19, brazing is not required. Therefore, when manufacturing the heat exchanger 50, high dimensional accuracy is not required. That is, the manufacturing cost of the flat tube 14 can be reduced. In addition, if the gap between the round pipe 13 and the side plate 19 is enlarged, the attachment of the side plate 19 becomes easy. In this way, the side plate 19 can be easily fixed to the heat exchanger main body 16 at low cost without providing additional components or the like.

In addition, since the round pipe 13 and the side plate 19 are mechanically in close contact, the heat exchanger main body 16 and the side plate 19 can be fixed without preparing a separate member or the like. In addition, in Embodiment 1, after the round pipe 13 is expanded to be in close contact with the fins 15 and the side plates 19 , the adhesion between the round pipe 13 and the fins 15 can be improved by brazing.

In addition, three or more rows of heat exchange cores may be arranged. In the first embodiment, two rows of heat exchange cores are arranged, but by appropriately changing the number of rows of the heat exchange cores, it is possible to adapt to the required heat exchange performance and obtain the same effects as those of the first embodiment. In addition, a plurality of heat exchange cores may be arranged in the layer direction. Even in this case, the same effects as those of the first embodiment can be obtained.

In addition, the number of the circular tubes 13 may be increased as the lamination length of the heat exchanger main body 16 is longer. Thereby, even if the stacking length of the heat exchanger main body 16 becomes longer and heavier, the load acting on the side plate 19 can be distributed by the corresponding increase in the round pipe 13 . Therefore, the thickness of the side plate 19 can be reduced.

In addition, the arrangement positions of the round tubes 13 and the flat tubes 14 can be appropriately changed. For example, the round tube 13 and the flat tube 14 are arranged such that the distance between the flat tube 14 and the blower is shorter than the distance between the round tube 13 and the blower. That is, in the heat exchanger 50 , the flat tubes 14 are arranged at a place where the air volume is relatively large, and the round tubes 13 are arranged at a place where the air volume is relatively small. Generally, the heat exchange performance of the flat tubes 14 is higher than that of the round tubes 13. Even if the number of the round tubes 13 is increased and the number of the flat tubes 14 is relatively decreased as in the first embodiment, the reduction in the heat exchange performance can be suppressed by arranging the flat tubes 14 at a location where the air volume is high.

In addition, the material of the side plate 19 of Embodiment 1 is aluminum. In addition, the side plate 19 can be made of other materials, such as stainless steel, in the environment where corrosion by potential difference does not generate|occur|produce. In addition, even in an environment where corrosion due to a potential difference occurs, the surface of the side plate 19 can be insulated by painting or the like, so that a material other than aluminum can be used as the side plate 19. Thereby, the thickness of the side plate 19 can be reduced.

In addition, when the round tube 13, the flat tube 14, and the fins 15 are brazed in the furnace, the elbow 17 and the header pipes 18a and 18b may be brazed together. In the first embodiment, after the round tube 13, the flat tube 14 and the fins 15 are furnace brazed, the elbow 17 and the header pipes 18a and 18b are manually brazed. When the round tubes 13, the flat tubes 14, and the fins 15 are furnace brazed, the elbows 17 and the header pipes 18a and 18b are brazed together, so that the processing cost can be reduced and the same as the first embodiment can be obtained. Effect.

Alternatively, after the flat tubes 14 are inserted into the fins 15, the round tubes 13 may be inserted into the fins 15 and expanded. In Embodiment 1, after inserting the round tube 13 into the fins 15 and expanding the tube, the flat tubes 14 are inserted into the fins 15 and furnace brazing is performed. On the other hand, first, the flat tubes 14 are inserted into the fins 15 , and then the circular tubes 13 are inserted into the fins 15 , expanded, and furnace brazed, whereby the circular tubes 13 and the fins 15 are brought into close contact. In this way, even if the manufacturing process of the heat exchanger 50 is changed, the same effects as those of the first embodiment can be obtained.

Embodiment 2

Fig. 11 is a side view showing side plates 26a and 26b in Embodiment 2 of the present invention. The difference between the second embodiment and the first embodiment is that the side plates 26a and 26b are provided in each row of the heat exchange cores. One side plate 19 of Embodiment 1 connects two rows of heat exchange cores. In the second embodiment, as shown in Fig. 11 , side plates 26a and 26b are arranged on the two heat exchange cores, respectively. The two side plates 26a and 26b are connected by the connecting portion 25 . The connection portion 25 connects the two side plates 19 by screwing the screws 27 . In this way, even if the side plates 26a and 26b are provided in each row, the same effect as that of the first embodiment can be obtained. In addition, the two side plates 26a and 26b may be connected by screw fastening, may be connected by other mechanical bonding such as caulking, or may be connected by metallurgical bonding such as brazing.

Embodiment 3

FIG. 12 is a side view showing the side plate 19 in Embodiment 3 of the present invention. As shown in FIG. 12 , the third embodiment is different from the first embodiment in that the circular tube 28 is elliptical. The circular tube 13 of Embodiment 1 is a perfectly circular tube. As in the third embodiment, the circular tube 28 has an elliptical shape, so that the amount of the fluid flowing inside increases and the heat exchange performance is improved, and the same effects as those of the first embodiment are obtained.

Description of reference numerals

1...compressor; 2...flow switching unit; 3...outdoor heat exchanger; 4...decompressor; 5...indoor heat exchanger; 6...refrigerant piping; 7...indoor unit; 8...outdoor unit; 9... Gas side internal and external connection valve; 10...liquid side internal and external connection valve; 11...outdoor blower; 12...indoor blower; 13...round pipe; 14...flat pipe; 14a...length; 15...fin; 16...heat exchanger body; 16a...First heat exchange core; 16b...Second heat exchange core; 17...Bend pipe; 18a, 18b...Header piping; 19...Side plate; 20...Circular through hole; 21...Flat insertion hole; 21a... Length; 22...Side circular hole; 23...Side flat hole; 23a...Length; 24...Fixing part; 25...Connecting part; 26a, 26b...Side plate; 27...Screw; 100 ... air conditioners.

Claims (12)

1. A heat exchanger, characterized in that it has: a heat exchanger body having a plurality of fins and hollow circular and flat tubes through which fluids pass; and a side plate, which is arranged at both ends of the plurality of fins, and is formed with a side circular hole into which the circular tube is inserted, The circular tube is mechanically fixed to the side circular hole of the side plate, A side flat hole into which the flat tube is inserted is formed in the side plate, A flat insertion hole into which the flat tube is inserted is formed in the fin, The length in the short axis direction of the flat tube and the length in the short axis direction of the flat insertion hole are shorter than the length in the short axis direction of the side flat hole, The side plates are separated from the flat tubes. 2. The heat exchanger of claim 1, wherein: The side plates are not in contact with the flat tubes. 3. The heat exchanger of claim 2, wherein: The size of the side flat hole of the side plate is larger than the size of the flat tube. 4. The heat exchanger according to any one of claims 1 to 3, wherein The circular pipe is fixed to the side circular hole of the side plate by expanding the pipe. 5. The heat exchanger according to any one of claims 1 to 3, wherein The round tube and the flat tube have brazing portions that are in close contact with the fins. 6. The heat exchanger according to any one of claims 1 to 3, wherein The flat tube is a porous tube whose interior is divided into a plurality of flow paths. 7. The heat exchanger according to any one of claims 1 to 3, wherein The heat exchanger main body is provided with a plurality of rows of the circular tubes and the flat tubes in a direction orthogonal to the layer direction. 8. The heat exchanger according to any one of claims 1 to 3, wherein The circular tube is provided at the end portion in the layer direction. 9. The heat exchanger of claim 8, wherein: The side plates are arranged in each row. 10. The heat exchanger according to any one of claims 1 to 3, wherein The circular tube is elliptical in shape. 11. The heat exchanger according to any one of claims 1 to 3, wherein The side panels are constructed of aluminum or stainless steel. 12. An air conditioner, characterized in that: It includes a refrigerant circuit connecting a compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger through refrigerant piping, The heat exchanger according to any one of claims 1 to 11 is used as the outdoor heat exchanger or the indoor heat exchanger.

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