Heat exchanger, heat exchanger unit, and refrigeration cycle device

Abstract

This heat exchanger is provided with: a plurality of flat pipes, each having a flat plate shape with a flow path formed inside, arranged with spacing in a vertical direction; a header that supplies a refrigerant to the flow path by communicating with each of the plurality of flat pipes; and an inflow pipe that guides the refrigerant into the header. The header has: a header body that has a space inside which the refrigerant circulates; and a partition plate that partitions the space in the header body into a first space on the flat pipe side and a second space on the opposite side from the first space, by extending in the vertical direction. In a lower end part of the partition plate, a communication hole by which the first space communicates with the second space is formed. The header further has a pair of baffle plates that are provided on both sides in a width direction of the communication hole and reduce an opening area of the communication hole.

Description

Heat exchanger, heat exchanger unit, and refrigeration cycle device

[0001] This application claims priority to Japanese Patent Application No. 2023-142667, filed on September 4, 2023, the contents of which are incorporated herein by reference.

[0002] A multi-flow heat exchanger including a plurality of flat tubes, a plurality of fins, and a pair of headers is known as a heat exchanger used in an air conditioner (see, for example, Patent Document 1 below). The plurality of flat tubes are inserted into the plurality of fins with a gap between them in the vertical direction. Each flat tube has a plurality of flow paths formed therein and spaced apart in the width direction. The plurality of fins are spaced apart in the direction in which the flat tubes extend.

[0003] The pair of headers each extend in the vertical direction. One header is connected to the plurality of flat tubes while accommodating one end of each of the plurality of flat tubes. The other header is connected to the plurality of flat tubes while accommodating the other end of each of the plurality of flat tubes.

[0004] The header is provided with a partition plate that divides the internal space into two. The header also has an inlet pipe for supplying refrigerant to the header. The refrigerant ejected from the inlet pipe flows into the space on the opposite side of the partition through a communication hole provided at the bottom of the partition plate, where it is distributed to each flat tube. Conventionally, the communication hole has generally been rectangular in shape.

[0005] International Publication No. 2019 / 078066

[0006] However, when the communication holes are simply rectangular as described above, there is a possibility that the refrigerant ejected from the inlet pipe may flow back through the corners of the communication holes, which makes it difficult to smoothly supply the refrigerant to the flat tubes.

[0007] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a heat exchanger, a heat exchanger unit, and a refrigeration cycle device that can operate stably by supplying refrigerant to flat tubes more smoothly.

[0008] In order to solve the above problems, the heat exchanger of the present disclosure comprises a flat plate-shaped plurality of flat tubes having a flow path formed therein and arranged at intervals in the vertical direction, a header that communicates with each of the plurality of flat tubes to supply refrigerant to the flow path, and an inlet pipe that directs refrigerant into the header, wherein the header has a header body having a space inside through which the refrigerant flows, and a partition plate that extends in the vertical direction to divide the space within the header body into a first space on the flat tube side and a second space on the opposite side of the first space, and a communication hole that connects the first space with the second space is formed in the lower end of the partition plate, and the heat exchanger further has a pair of baffles on both sides of the communication hole in the width direction to reduce the opening area of ​​the communication hole.

[0009] A heat exchanger unit according to the present disclosure includes the above-described heat exchanger and a blower that sends air to the heat exchanger.

[0010] A refrigeration cycle device according to the present disclosure includes the above-described heat exchanger unit.

[0011] According to the present disclosure, it is possible to provide a heat exchanger, a heat exchanger unit, and a refrigeration cycle apparatus that can operate stably by more smoothly supplying refrigerant to flat tubes.

[0012] FIG. 1 is a circuit diagram showing a configuration of a refrigeration cycle device according to an embodiment of the present disclosure. FIG. 2 is a diagram showing a configuration of a heat exchanger unit according to an embodiment of the present disclosure. FIG. 3 is a perspective view showing a configuration of a flat tube according to an embodiment of the present disclosure. FIG. 4 is a cross-sectional view showing a configuration of a header according to an embodiment of the present disclosure. FIG. 5 is a diagram showing a configuration of a partition plate and a communication hole according to an embodiment of the present disclosure. FIG. 6 is a diagram showing a first modified example of a partition plate and a communication hole according to an embodiment of the present disclosure. FIG. 7 is a diagram showing a second modified example of a partition plate and a communication hole according to an embodiment of the present disclosure. FIG. 8 is a cross-sectional view showing a modified example of an inlet pipe according to an embodiment of the present disclosure.

[0013] The overall configuration of a refrigeration cycle apparatus 10 of the first embodiment will be described with reference to Fig. 1. In Fig. 1, solid arrows indicate the direction of refrigerant flow during heating operation, and dotted arrows indicate the direction of refrigerant flow during cooling operation. (Overall Configuration of Refrigeration Cycle Apparatus) The refrigeration cycle apparatus 10 is configured such that a four-way valve 15, a compressor 16, a first heat exchanger unit 18, an expansion valve 19, and a second heat exchanger unit 23 are connected by refrigerant piping 14. The refrigeration cycle apparatus 10 has an outdoor unit 11 and an indoor unit 12.

[0014] (Overall Configuration of Outdoor Unit) The outdoor unit 11 has a four-way valve 15 , a compressor 16 , a first heat exchanger unit 18 , and an expansion valve 19 .

[0015] (Configuration of Four-Way Valve) The four-way valve 15 has connection portions 15A to 15D to which one of the ends of the first and second refrigerant pipes 14A, 14B constituting the refrigerant pipe 14 is connected. One end of the first refrigerant pipe 14A is connected to connection portion 15A. The other end of the first refrigerant pipe 14A is connected to connection portion 15B. One end of the second refrigerant pipe 14B is connected to connection portion 15C. The other end of the second refrigerant pipe 14B is connected to connection portion 15D.

[0016] The four-way valve 15 configured as described above switches the direction of refrigerant flow between heating operation and cooling operation. Specifically, during cooling operation, the refrigerant circulates through the compressor 16, first heat exchanger unit 18, expansion valve 19, and second heat exchanger unit 23 in that order. On the other hand, during heating operation, the refrigerant circulates through the compressor 16, second heat exchanger unit 23, expansion valve 19, and first heat exchanger unit 18 in that order.

[0017] (Configuration of Compressor) The compressor 16 is provided in the second refrigerant pipe 14B. The compressor 16 compresses the refrigerant flowing through the second refrigerant pipe 14B.

[0018] (Configuration of First Heat Exchanger Unit) The first heat exchanger unit 18 has a first blower 26 and a heat exchanger 27 .

[0019] (Configuration of First Fan) The first fan 26 supplies air to the heat exchanger 27 .

[0020] (Overall Configuration of Heat Exchanger) The heat exchanger 27 will be described with reference to FIGS.

[0021] The heat exchanger 27 is used as a condenser during cooling operation and radiates heat to the outside, and is used as an evaporator during heating operation and absorbs heat from the outside. The heat exchanger 27 is provided on the first refrigerant pipe 14A located between the four-way valve 15 and the expansion valve 19. The heat exchanger 27 has a plurality of flat tubes 41, a plurality of fins 42, and a pair of headers 43.

[0022] (Configuration of Flat Tubes) Next, the flat tubes 41 will be described with reference to Figures 2 and 3. The flat tubes 41 are heat transfer tubes with a flat outer shape. The flat tubes 41 extend in the X direction. Inside the flat tube 41, a plurality of flow paths 41A through which the refrigerant flows are formed at intervals in the Y direction. The plurality of flat tubes 41 include a flat tube 41F located at the bottom and a flat tube 41S located second from the bottom.

[0023] The flat tube 41 has a pair of end portions 41B, 41C arranged in the X direction. One end portion 41B is housed in one header 43. The other end portion 41C is housed in the other header 43. The multiple flat tubes 41 are arranged at intervals in the Z direction, and are supported on both sides in the X direction by the pair of headers 43.

[0024] (Configuration of Fins) Next, the multiple fins 42 will be described with reference to Fig. 2. Each of the multiple fins 42 has a flat tube insertion portion 42A formed at intervals in the Z direction. The flat tubes 41 are inserted into the flat tube insertion portion 42A.

[0025] (Header Configuration) Next, the configuration of a pair of headers 43 will be described with reference to Figures 2 and 4. As an example, the pair of headers are arranged facing each other in the X direction. One header 43 is connected to the plurality of flat tubes 41 so that one end 41B of each of the plurality of flat tubes 41 is arranged on the inside. The other header 43 is connected to the plurality of flat tubes 41 so that the other end 41C of each of the plurality of flat tubes 41 is arranged on the inside.

[0026] Here, a description will be given of the configuration of the header 43 on the evaporator inlet side of the pair of headers 43. The header 43 has a header body 45, a partition plate 47, and a nozzle portion 49 (inlet pipe).

[0027] (Configuration of Header Body) The header body 45 is a cylindrical member that extends in the Z direction and has closed upper and lower ends. The header body 45 defines a columnar internal space 53 inside. The header body 45 has an opening 45A and a bottom surface 45a. The opening 45A is formed in a side wall of the header body 45. The tip end of the first refrigerant pipe 14A is inserted into the opening 45A. The opening 45A is formed in a position facing the nozzle portion 49 in the X direction.

[0028] The bottom surface 45a has a first bottom surface 45aa, a second bottom surface 45ab, and a third bottom surface 45ac. The first bottom surface 45aa defines the lower end of the second space 54. The second bottom surface 45ab defines the lower end of the first space 55. The third bottom surface 45ac is disposed between the first bottom surface 45aa and the second bottom surface 45ab, which are disposed in the X direction. The third bottom surface 45ac is connected to the first bottom surface 45aa and the second bottom surface 45ab.

[0029] (Configuration of Partition Plate) Next, the partition plate 47 will be described with reference to FIGS. 4 to 6 . The partition plate 47 is disposed within the header body 45 while extending in the Z direction. Both ends of the partition plate 47 disposed in the Y direction are connected to the header body 45. The partition plate 47 divides the internal space 53 into a second space 54 and a first space 55 disposed in the X direction, with the refrigerant able to flow through the upper and lower ends of the internal space 53. The second space 54 is disposed on the side to which the first refrigerant pipe 14A is connected. The first space 55 is disposed on the side to which the multiple flat tubes 41 are connected. The partition plate 47 forms a refrigerant circulation path.

[0030] The partition plate 47 has an upper end surface 47a, a first surface 47b, a second surface 47c, and a communication hole 47C.

[0031] The upper end surface 47a is disposed at a position spaced downward from the header body 45 facing the upper end surface 47a in the Z direction. The refrigerant moves between the second space 54 and the first space 55 through an opening formed between the upper end surface 47a and the header body 45 facing the upper end surface 47a.

[0032] The first surface 47b is a plane perpendicular to the X direction and defines the other side in the X direction of the second space 54. The second surface 47c is a surface disposed on the opposite side of the first surface 47b. The second surface 47c is a plane perpendicular to the X direction and defines one side in the X direction of the first space 55.

[0033] The nozzle portion 49 is disposed in the second space 54. A refrigerant flow portion through which the refrigerant passes is formed on each side of the nozzle portion 49 in the Y direction. The refrigerant flow portion is configured as part of the second space 54.

[0034] The nozzle portion 49 has a jet hole 49A located at its lower end. The jet hole 49A is circular when viewed from the Z direction. When the heat exchanger 27 is operated as an evaporator, refrigerant (a two-phase gas-liquid refrigerant) is supplied to the nozzle portion 49 via the first refrigerant pipe 14A. The jet hole 49A blows the refrigerant toward the first bottom surface 45aa, causing the refrigerant to collide with the first bottom surface 45aa and reducing the difference in the state of the refrigerant in the Y direction. After colliding with the first bottom surface 45aa, the refrigerant flows through the communication hole 47C to the lower portion of the first space 55, then flows toward the upper end of the first space 55, and is guided into the multiple flow paths 41A formed in each flat tube 41. The refrigerant that reaches the upper end of the first space 55 flows to the upper end of the second space 54 and then flows toward the first bottom surface 45aa.

[0035] When the heat exchanger 27 is operated as a condenser, the refrigerant flowing from the flat tubes 41 into the first space 55 flows into the first refrigerant pipe 14A via the injection holes 49A.

[0036] The communication hole 47C is rectangular with its longitudinal direction aligned horizontally. The refrigerant flows between the second space 54 and the first space 55 through the communication hole 47C.

[0037] A baffle plate 50 is provided at each of the upper corners of both sides of the communication hole 47C in the width direction (longitudinal direction). Each baffle plate 50 is rectangular when viewed horizontally. The widthwise dimensions of the baffles 50 are equal to each other. The pair of baffles are arranged symmetrically with respect to the XZ plane passing through the nozzle portion 49 located at the center in the width direction. The lower edge of the baffle plate 50 is spaced upward from the lower edge of the communication hole 47C. This blocks a portion of the communication hole 47C. Therefore, the opening shape of the communication hole 47C is T-shaped. This is to prevent the refrigerant sprayed from the nozzle portion 49 from flowing back toward the second space 54 through the upper corners of the communication hole 47C.

[0038] (Operation and Effect) As described above, the header 43 includes a partition plate 47 that divides the internal space into two. The header 43 also includes an inlet pipe (nozzle portion 49) for supplying refrigerant to the header. The refrigerant ejected from the inlet pipe flows into the space on the opposite side of the partition plate 47 through a communication hole 47C provided at the bottom of the partition plate 47 and is distributed to each flat tube 41. Conventionally, the communication hole 47C has generally been rectangular in shape. However, if the communication hole 47C is simply rectangular, the refrigerant ejected from the inlet pipe (nozzle portion 49) may flow back into the second space 54 through the corners of the communication hole 47C. This poses a problem of preventing smooth refrigerant supply to the flat tubes 41. Therefore, the present embodiment employs the above-described configurations.

[0039] According to the above configuration, because both widthwise sides of the communication hole 47C are blocked by the baffle plate 50, it is possible to reduce the possibility that the refrigerant that has once flowed into the first space 55 will flow back into the second space 54 through corners or the like of the communication hole 47C. This makes it possible to stably and efficiently supply the refrigerant to each flat tube 41, thereby improving the performance of the heat exchanger.

[0040] Here, the refrigerant flowing out of the inlet pipe (nozzle portion 49) is sprayed downward. Therefore, backflow is unlikely to occur in the lower part of the communication hole 47C. With the above configuration, the opening is located in an area where backflow is unlikely to occur, and the baffle plate 50 is located in an area where backflow is likely to occur, thereby making it possible to further stabilize the refrigerant flow field. This allows for a stable and efficient supply of refrigerant to each flat tube 41, improving the performance of the heat exchanger.

[0041] According to the above configuration, the dimensions of the pair of baffles 50 are made equal to each other in accordance with the position of the inlet pipe (nozzle portion 49). This makes it possible to form a flow field that is symmetrical with respect to the XZ plane that passes through the nozzle portion 49. This makes it possible to stably and efficiently supply refrigerant to each flat tube 41, thereby improving the performance of the heat exchanger.

[0042] (Other Embodiments) Although the embodiments of the present disclosure have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure.

[0043] For example, as a first modified example, the baffles 50 may each have a triangular shape as shown in Fig. 6. Specifically, the baffles 50 have a width dimension that gradually increases from the bottom to the top.

[0044] Here, the refrigerant flow field forms an elliptical shape with the inlet pipe (nozzle portion 49) as the center. Therefore, by forming the baffle plate 50 in the triangular shape as described above, it is possible to reduce the possibility of obstructing the flow of refrigerant other than the backflow component. This makes it possible to stably and efficiently supply refrigerant to each flat tube 41, thereby improving the performance of the heat exchanger.

[0045] Furthermore, as a second modified example, as shown in FIG. 7 , the inlet pipe (nozzle portion 49) may be arranged biased to one side in the width direction of the communication hole 47C, and the width dimension of one of the pair of baffle plates 50 may be smaller than the width dimension of the other baffle plate 50.

[0046] According to the above configuration, the dimensions of the pair of baffles 50 are different from each other in accordance with the position of the inlet pipe (nozzle portion 49). This allows the opening shape of the communication hole 47C to be formed in accordance with the refrigerant flow field, with the nozzle portion 49 as the reference. This makes it possible to stably and efficiently supply refrigerant to each flat tube 41, thereby improving the performance of the heat exchanger.

[0047] 8 may be employed as a modified example of the inlet pipe (nozzle portion 49). In this example, the injection direction of the injection hole 49A of the nozzle portion 49 extends downward from the second space 54 toward the first space 55. Furthermore, a guide portion 60 is provided in a region of the header body 45 facing the injection hole 49A. The guide portion 60 has an inclined surface 61 that extends downward from the second space 54 toward the first space 55, thereby guiding the refrigerant toward the communication hole.

[0048] According to the above configuration, the refrigerant injected from the injection hole 49A is guided along the inclined surface 61 of the guide portion 60 and flows downward as it moves from the second space 54 side to the first space 55 side. This stabilizes the flow of the refrigerant and further reduces the possibility of backflow of the refrigerant occurring between the first space 55 and the second space 54. This makes it possible to stably and efficiently supply the refrigerant to each flat tube 41, thereby improving performance as a heat exchanger.

[0049] <Additional Notes> The heat exchanger 27, the heat exchanger unit 18, and the refrigeration cycle apparatus 10 described in each embodiment can be understood, for example, as follows.

[0050] (1) The heat exchanger 27 according to the first aspect has a flat plate shape, has a flow path formed therein, and includes a plurality of flat tubes 41 arranged at intervals in the vertical direction, a header 43 that communicates with each of the plurality of flat tubes 41 to supply refrigerant to the flow path, and an inlet pipe (nozzle portion 49) that directs refrigerant into the header 43. The header 43 has a header body 45 having a space therein through which the refrigerant flows, and a partition plate 47 that extends in the vertical direction to divide the space within the header body 45 into a first space 55 on the flat tube 41 side and a second space 54 on the opposite side of the first space 55. A communication hole 47C that communicates the first space 55 with the second space 54 is formed in the lower end of the partition plate 47, and the heat exchanger 27 further includes a pair of baffles 50 that are provided on both widthwise sides of the communication hole 47C to reduce the opening area of ​​the communication hole 47C.

[0051] According to the above configuration, since both sides of the width of the communication hole 47C are blocked by the baffle plate 50, the possibility that the refrigerant that has once flowed out into the first space 55 will flow back into the second space 54 through the corners of the communication hole 47C, etc., can be reduced.

[0052] (2) The heat exchanger 27 according to the second aspect is the heat exchanger 27 of (1), wherein the baffle plate 50 is rectangular when viewed from the direction in which the inlet pipe extends, and the lower edge of the baffle plate 50 is spaced upward from the lower edge of the communication hole 47C.

[0053] The refrigerant flowing out of the inlet pipe (nozzle portion 49) is sprayed downward. Therefore, backflow is unlikely to occur in the lower part of the communication hole 47C. With the above configuration, the opening is located in an area where backflow is unlikely to occur, and the baffle is located in an area where backflow is likely to occur, so the refrigerant flow field can be further stabilized.

[0054] (3) The heat exchanger 27 according to the third aspect is the heat exchanger 27 of (1), wherein the baffle plate 50 has a width dimension that increases from bottom to top when viewed from the direction in which the inlet pipe extends.

[0055] Here, the flow field of the refrigerant is elliptical with the inlet pipe (nozzle portion 49) as the center. Therefore, by forming the baffle plate 50 in the triangular shape as described above, it is possible to reduce the possibility that the flow of components other than the backflow component of the refrigerant will be obstructed.

[0056] (4) The heat exchanger 27 according to the fourth aspect is the heat exchanger 27 according to any one of the aspects (1) to (3), in which the inlet pipe is provided at the center of the communication hole 47C in the width direction, and the width dimensions of the pair of baffles 50 are equal to each other.

[0057] According to the above configuration, the dimensions of the pair of baffles 50 are made equal to each other in accordance with the position of the inlet pipe (nozzle portion 49). This makes it possible to form a flow field that is plane-symmetrical with respect to the XZ plane that passes through the nozzle portion 49.

[0058] (5) The heat exchanger 27 according to the fifth aspect is the heat exchanger 27 according to any one of the aspects (1) to (3), wherein the inlet pipe is positioned biased to one side in the width direction of the communication hole 47C, and the width dimension of the baffle plate 50 on one side of the pair of baffles 50 is smaller than the width dimension of the baffle plate 50 on the other side.

[0059] According to the above-described configuration, the dimensions of the pair of baffles 50 are different from each other in accordance with the position of the inlet pipe (nozzle portion 49). As a result, the opening shape of the communication hole 47C can be formed in accordance with the flow field of the refrigerant, with the nozzle portion 49 as a reference.

[0060] (6) The heat exchanger 27 according to the sixth aspect is a heat exchanger 27 according to any one of the aspects (1) to (5), wherein the inlet pipe has an injection hole 49A for injecting the refrigerant into the second space 54, the injection direction of the injection hole 49A extending downward from the second space 54 side toward the first space 55 side, and a guide portion 60 having an inclined surface 61 extending downward from the second space 54 side toward the first space 55 side in the region opposite the injection hole 49A in the header body 45 is provided, the inclined surface 61 extending downward from the second space 54 side toward the first space 55 side to guide the refrigerant toward the communication hole 47C.

[0061] According to the above configuration, the refrigerant injected from the injection hole 49A is guided along the inclined surface 61 of the guide portion 60 and flows downward from the second space 54 toward the first space 55. This stabilizes the flow of the refrigerant, further reducing the possibility of backflow of the refrigerant between the first space 55 and the second space 54.

[0062] (7) A heat exchanger unit 18 according to a seventh aspect includes a heat exchanger 27 according to any one of aspects (1) to (6) and a blower 26 that sends air to the heat exchanger 27.

[0063] According to the above configuration, the refrigerant can be stably introduced into the flat tubes 41, and therefore, a heat exchanger unit 18 that operates more efficiently can be provided.

[0064] (8) The refrigeration cycle apparatus 10 according to the eighth aspect includes the heat exchanger unit 18 of (7).

[0065] According to the above configuration, it is possible to provide a refrigeration cycle device 10 that can operate more stably.

[0066] According to the present disclosure, it is possible to provide a heat exchanger, a heat exchanger unit, and a refrigeration cycle apparatus that can operate stably by supplying refrigerant to flat tubes more smoothly.

[0067] REFRIGERATION CYCLE DEVICE 10 REFRIGERATION CYCLE DEVICE 11 OUTDOOR UNIT 12 INDOOR UNIT 14 REFRIGERATOR PIPE 14A FIRST REFRIGERATOR PIPE 14B SECOND REFRIGERATOR PIPE 15 FOUR-WAY VALVE 15A TO 15D CONNECTION PORTION 16 COMPRESSOR 18 FIRST HEAT EXCHANGER UNIT 19 EXPANSION VALVE 23 SECOND HEAT EXCHANGER UNIT 26 FIRST AIR BLOWER 27 HEAT EXCHANGER 32 SECOND AIR BLOWER 35 ENTRY / OUTLET HEADER 37 TURNING HEADER 41 FLAT TUBE 45 HEADER BODY 47 PARTITION PLATE 47C COMMUNICATION HOLE 49 NOZZLE PORTION 49A INJECTION HOLE 50 BAFFLET 60 GUIDE PORTION 61 INCLINED SURFACE

Claims

1. A heat exchanger comprising: a plurality of flat tubes each having a flat plate shape with a flow passage formed therein and arranged at intervals in the vertical direction; a header communicating with each of the plurality of flat tubes to supply a refrigerant to the flow passage; and an inlet pipe directing the refrigerant into the header, wherein the header has a header body having a space therein through which the refrigerant flows, and a partition plate extending in the vertical direction to divide the space within the header body into a first space on the flat tube side and a second space on the opposite side to the first space, a communication hole formed in a lower end of the partition plate connecting the first space with the second space, and a pair of baffles provided on both widthwise sides of the communication hole to reduce the opening area of ​​the communication hole.

2. A heat exchanger as described in claim 1, wherein the baffle plate has a rectangular shape when viewed from the direction in which the inlet pipe extends, and the lower edge of the baffle plate is spaced upward from the lower edge of the communicating hole.

3. A heat exchanger as set forth in claim 1, wherein the baffle plate has a width dimension that increases from bottom to top when viewed in the direction in which the inlet pipe extends.

4. A heat exchanger as claimed in any one of claims 1 to 3, wherein the inlet pipe is provided at the centre in the width direction of the communicating hole, and the dimensions in the width direction of the pair of baffles are equal to each other.

5. A heat exchanger as described in any one of claims 1 to 3, wherein the inlet pipe is positioned biased to one side in the width direction of the communicating hole, and the width dimension of one of the pair of baffle plates is smaller than the width dimension of the other baffle plate.

6. A heat exchanger as described in claim 1, wherein the inflow pipe has an injection hole for injecting the refrigerant into the second space, the injection direction of the injection hole extends downward from the second space side toward the first space side, and a guide portion having an inclined surface is provided in an area of ​​the header body opposite the injection hole, the guide portion extending downward from the second space side toward the first space side to guide the refrigerant toward the communication hole.

7. A heat exchanger unit comprising: the heat exchanger according to claim 1; and a blower for blowing air to the heat exchanger.

8. A refrigeration cycle device comprising the heat exchanger unit according to claim 7.

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