Heat exchange unit and air handling unit

Abstract

To solve a problem in which drain water in a drain pan may be scattered by a flow of heat-exchanged air in a heat exchange unit.SOLUTION: A heat exchange unit 20 comprises a plurality of flattened tubes 23, a first header 21, a second header 22, and a drain pan 24. The first header 21 and the second header 22 are connected to both ends of the plurality of flattened tubes 23, and are arranged so as to extend in a first direction D1 in which the plurality of flattened tubes 23 are arranged side by side. The plurality of flattened tubes 23 each comprise a first part 23a, a second part 23b, and a connection part 23c. The drain pan 24 comprises a first wall 24a, a second wall 24b, and a receiving part 24c. The first wall 24a includes a third wall 24h extending in the first direction D1 above an opening part 24f. The first header 21 is arranged in such a manner that at least a portion of the first header 21 is located above the third wall 24h when viewed from the first direction D1. The third wall 24h comprises a first surface 24i inclined so as to become a downward gradient toward a second direction D2.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a heat exchange unit and an air handling unit. [Background technology]

[0002] Conventionally, as disclosed in Patent Document 1 (U.S. Pat. No. 5,284,027), there is known an air handling unit equipped with a heat exchange unit that exchanges heat between a refrigerant and air. The heat exchange unit has a drain pan for temporarily storing and discharging drain water. Summary of the Invention [Problem to be solved by the invention]

[0003] If the header of the heat exchange unit is positioned inside the drain pan so that the longitudinal direction of the header runs along the bottom surface of the drain pan, there is a risk that drain water from the header will splash and flow into the opening of the drain pan along with the heat-exchanged air. [Means for solving the problem]

[0004] A heat exchange unit according to a first aspect includes a plurality of flat tubes, a first header, a second header, and a drain pan. The plurality of flat tubes are aligned along a first direction, and a refrigerant flows through the inside of the plurality of flat tubes. The first header and the second header are connected to both ends of the plurality of flat tubes and arranged to extend in the first direction. The drain pan receives condensation water from the plurality of flat tubes, the first header, and the second header. Each of the plurality of flat tubes has a first portion, a second portion, and a connection portion. The first portion is connected to the first header and extends in a predetermined direction when viewed from the first direction. The second portion is connected to the second header and extends in a predetermined direction when viewed from the first direction. The connection portion connects the first portion and the second portion such that an angle between a direction in which the first portion extends and a direction in which the second portion extends when viewed from the first direction is less than 180 degrees. The flat tubes are arranged such that the first header is located above the connection portion and the connection portion is located above the second header. The drain pan has a first wall, a second wall, and a receiving portion. The first wall surrounds an opening through which air flows in a second direction perpendicular to the direction in which the drain pan extends when viewed from the first direction. The second wall is located outside the first wall when viewed from the second direction. The receiving portion connects the first wall and the second wall downstream of the first header and downstream of the second header in the second direction. The first wall includes a third wall extending in the first direction above the opening when viewed from the second direction. The first header is arranged such that at least a part of the first header is located above the third wall when viewed from the first direction. The third wall has a first surface that is an upper surface that is inclined downwardly toward the second direction.

[0005] The heat exchange unit of the first aspect has a configuration in which a side wall (third wall) on the side (center) of the opening of the drain pan and located immediately below the upper header (first header) is inclined downward toward the air flow direction (second direction), thereby preventing drain water from scattering from the first header and flowing into the opening.

[0006] A heat exchange unit according to a second aspect is the heat exchange unit according to the first aspect, wherein the third wall has a first surface that extends in the second direction to a position of a lower end of the first header.

[0007] In the heat exchange unit according to the second aspect, the upstream end of the third wall in the second direction extends to just below the lowest part of the first header, thereby preventing the drain water from scattering from the first header and flowing into the opening.

[0008] A heat exchange unit according to a third aspect is the heat exchange unit according to the first aspect, wherein the third wall has a first surface that extends in the second direction to a position where the first header and the first portion are connected.

[0009] In the heat exchange unit according to the third aspect, the upstream end of the third wall in the second direction extends to immediately below the connection between the first header and the flat tubes, thereby preventing the drain water from splashing from the first header and flowing into the opening.

[0010] A heat exchange unit according to a fourth aspect is the heat exchange unit according to the first aspect, in which a plurality of heat exchange sections, each having a plurality of flat tubes, a first header, and a second header, are arranged along a second direction. The third wall has a first surface extending in the second direction to a position of a lower end of a first header that is closest to the connection portion in the second direction among the first headers of the plurality of heat exchange sections.

[0011] In the heat exchange unit of the fourth aspect, the upstream end of the third wall in the second direction extends to just below the bottom of the first header that is the most upstream in the air flow direction, thereby preventing drain water from scattering from the first header and flowing into the opening.

[0012] A heat exchange unit of a fifth aspect is the heat exchange unit of the first aspect, in which a plurality of heat exchange sections, each having a plurality of flat tubes, a first header, and a second header, are arranged along the second direction. The third wall has a first surface extending in the second direction to a position where the first section is connected to a first header that is closest to the connection section in the second direction among the first headers of the plurality of heat exchange sections.

[0013] In the heat exchange unit of the fifth aspect, the upstream end of the third wall in the second direction extends to immediately below the connection between the first header and the flat tubes, which is located most upstream in the air flow direction. This prevents drain water from scattering from the first header and flowing into the opening.

[0014] A heat exchange unit according to a sixth aspect is the heat exchange unit according to any one of the first to fifth aspects, wherein the first surface is further inclined in the first direction.

[0015] In a heat exchange unit according to a sixth aspect, the upper surface (first surface) of the third wall has a portion that is inclined in the longitudinal direction of the first header, thereby improving drainage performance.

[0016] An air handling unit according to a seventh aspect includes the heat exchange unit according to any one of the first to sixth aspects and a blower unit. The blower unit generates a flow of air that flows in a second direction and exchanges heat with a refrigerant in the heat exchange unit.

[0017] The air handling unit according to the seventh aspect prevents drain water from being discharged together with the air that has been heat exchanged. [Brief description of the drawings]

[0018] [Figure 1] 1 is a side view of the interior of an air handling unit 10 of the first embodiment as viewed from a first direction D1. [Diagram 2] 2 is a side view of the interior of the air handling unit 10 of the first embodiment as viewed from a third direction D3. FIG. [Diagram 3] FIG. 2 is a perspective view of a heat exchange unit 20 according to the first embodiment. [Figure 4] 4 is a side view of the heat exchange unit 20 of the first embodiment as viewed from a first direction D1. In FIG. [Diagram 5] FIG. 2 is a top view of the heat exchange unit 20 of the first embodiment as viewed from a second direction D2. [Figure 6]11 is a side view of the heat exchange unit 20 of the first embodiment as viewed from a third direction D3. FIG. [Figure 7] FIG. 2 is a perspective view of a drain pan 24 according to the first embodiment. [Figure 8] FIG. 2 is a top view of the drain pan 24 of the first embodiment. [Figure 9] 2 is a cross-sectional view of a drain pan 24 of the first embodiment as viewed from a first direction D1. FIG. [Figure 10] 11 is a cross-sectional view of a drain pan 24 of a second embodiment as viewed from a first direction D1. FIG. [Figure 11] 11 is a cross-sectional view of a drain pan 24 of a third embodiment as viewed from a first direction D1. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] -First embodiment- (1) Overall Configuration of Air Handling Unit 10 Air handling unit 10 includes a casing 11, a support member 12, a heat exchange unit 20, and a blower unit 30. As shown in Figs. 1 and 2, air handling unit 10 is installed horizontally so that the longitudinal direction of casing 11 is along the horizontal direction. The internal space of casing 11 is divided into a heat exchange chamber 17 and a blower chamber 18 by support member 12. A water receiving container 19 and a heat exchange unit 20 are installed in heat exchange chamber 17. A blower unit 30 is installed in blower chamber 18. The water receiving container 19 is installed below heat exchange unit 20 and at the bottom of heat exchange chamber 17. The water receiving container 19 is connected to support member 12.

[0020] An intake port 13 is formed on one surface 11a in the longitudinal direction of the casing 11. An exhaust port 14 is formed on the other surface 11b in the longitudinal direction of the casing 11. An intake duct 15 is connected to the intake port 13. An exhaust duct 16 is connected to the exhaust port 14. The intake port 13 is connected to the intake duct 15 and a heat exchange chamber 17. The exhaust port 14 is connected to the exhaust duct 16 and an air blowing chamber 18. The heat exchange chamber 17 communicates with the air blowing chamber 18.

[0021] The blower unit 30 has a centrifugal fan such as a sirocco fan and a motor that drives the centrifugal fan. The blower unit 30 drives the centrifugal fan to generate an airflow that is an air flow from the suction port 13 to the outlet port 14 via the heat exchange chamber 17 and the blower chamber 18. The airflow flows horizontally in the internal space of the casing 11 from the suction port 13 to the outlet port 14. The air carried by the airflow is heat exchanged by the heat exchange unit 20 when passing through the heat exchange chamber 17. The air handling unit 10 draws in air from the suction port 13, and blows out the air from the outlet port 14 after the air has been heat exchanged by the heat exchange unit 20 and has its temperature adjusted.

[0022] Hereinafter, the terms “upstream side” and “downstream side” are used based on the direction of airflow from the inlet 13 toward the outlet 14. The heat exchange chamber 17 is located upstream of the blower chamber 18.

[0023] (2) Detailed configuration of heat exchange unit 20 The heat exchange unit 20 includes a plurality of flat tubes 23, a first header 21, a second header 22, and a drain pan 24. The heat exchange unit 20 constitutes a part of a refrigerant circuit that performs a vapor compression refrigeration cycle.

[0024] (2-1) Multiple flat tubes 23 As shown in FIG. 1 to FIG. 6, the flat tubes 23 are arranged in a line along a predetermined direction. Hereinafter, the direction in which the flat tubes 23 are arranged is referred to as a first direction D1. The first direction D1 is parallel to the horizontal direction. In FIG. 3, 5, and 6, the flat tubes 23 located in the center in the first direction D1 are omitted. A direction parallel to the horizontal direction and perpendicular to the first direction D1 is referred to as a second direction D2. The second direction D2 is a direction from the upstream side to the downstream side. A direction perpendicular to the first direction D1 and the second direction D2 is referred to as a third direction D3. The third direction D3 is parallel to the vertical direction. The third direction D3 is a direction in which the drain pan 24 extends when viewed from the first direction D1. A refrigerant that exchanges heat with the air passing through the heat exchange chamber 17 flows inside each of the flat tubes 23. The first header 21 and the second header 22 are connected to both ends of the flat tubes 23.

[0025] As shown in FIG. 4, the heat exchange unit 20 has a configuration in which the first heat exchange section 40a and the second heat exchange section 40b are arranged along the second direction D2. The first heat exchange section 40a and the second heat exchange section 40b are units each including a plurality of flat tubes 23, a first header 21, and a second header 22. When viewed from the first direction D1, the first heat exchange section 40a is located outside the second heat exchange section 40b. In other words, the connection section 23c of the first heat exchange section 40a is located upstream of the connection section 23c of the second heat exchange section 40b. The first heat exchange section 40a is connected to the second heat exchange section 40b via the refrigerant pipe 25.

[0026] Each of the flat tubes 23 has one first portion 23a, one second portion 23b, and one connection portion 23c. As shown in Figs. 4 to 6, the first portion 23a extends in a predetermined direction when viewed from the first direction D1. The second portion 23b extends in a predetermined direction different from the direction in which the first portion 23a extends when viewed from the first direction D1. As shown in Fig. 4, the connection portion 23c connects the first portion 23a and the second portion 23b such that the angles α and β between the direction in which the first portion 23a extends and the direction in which the second portion 23b extends when viewed from the first direction D1 are less than 180 degrees. The connection portion 23c may connect the first portion 23a and the second portion 23b such that the angles α and β are 90 degrees or less.

[0027] One end of the first portion 23a is connected to the first header 21. The other end of the first portion 23a is connected to the connection portion 23c. One end of the second portion 23b is connected to the second header 22. The other end of the second portion 23b is connected to the connection portion 23c. The flat tubes 23 are arranged such that the first header 21 is located above the connection portion 23c, and the connection portion 23c is located above the second header 22. Therefore, as shown in FIG. 4, the flat tubes 23 have a V-shape rotated 90 degrees clockwise when viewed from the first direction D1.

[0028] The first portion 23a and the second portion 23b are flat multi-hole pipes having a plurality of passages through which the refrigerant passes. The plurality of passages in the first portion 23a are arranged side by side along a direction perpendicular to the direction in which the first portion 23a extends when viewed from the first direction D1. The plurality of passages in the second portion 23b are arranged side by side along a direction perpendicular to the direction in which the second portion 23b extends when viewed from the first direction D1. The connection portion 23c is a flat multi-hole pipe partially curved so as to connect the plurality of passages in the first portion 23a and the plurality of passages in the second portion 23b, as shown in Figs. 5 and 6.

[0029] As shown in Figs. 4 to 6, the first portion 23a and the second portion 23b are arranged such that their main surfaces are aligned with the second direction D2 and the third direction D3. The first portion 23a and the second portion 23b are arranged at a predetermined interval along the first direction D1 perpendicular to the main surfaces. Fins are arranged in the gaps between the multiple first portions 23a arranged along the first direction D1. The first portion 23a and the fins are joined by brazing. Fins are arranged in the gaps between the multiple second portions 23b arranged along the first direction D1. The second portion 23b and the fins are joined by brazing. The fins are, for example, corrugated fins formed by plastically deforming a flat metal into a corrugated shape.

[0030] (2-2) First header 21 and second header 22 The first header 21 and the second header 22 are connected to both ends of the multiple flat tubes 23. The first header 21 and the second header 22 are arranged to extend in a first direction D1. The first header 21 and the second header 22 are located upstream of the drain pan 24. The first header 21 and the second header 22 are connected to an external refrigerant circuit via refrigerant piping 25.

[0031] (2-3) Drain pan 24 The drain pan 24 receives condensation water from the flat tubes 23, the first header 21, and the second header 22. The condensation water is water generated on the surfaces of the flat tubes 23, the first header 21, and the second header 22 due to heat exchange between the refrigerant flowing inside the flat tubes 23 and the air passing through the heat exchange chamber 17. A part of the generated condensation water is blown off the surfaces of the flat tubes 23, the first header 21, and the second header 22 by the airflow and is received in the drain pan 24. The drain pan 24 is fixed to the support member 12. The water receiving container 19 receives condensation water that falls from the surfaces of the flat tubes 23, the first header 21, and the second header 22 due to their own weight. As shown in FIG. 1 and FIG. 2, the water receiving container 19 has one drain port 19d.

[0032] 7 to 9, the drain pan 24 has a first wall 24a, a second wall 24b, and a receiving portion 24c. When viewed from the second direction D2, the drain pan 24 has a substantially rectangular shape.

[0033] The first wall 24a surrounds an opening 24f through which air flowing in the heat exchange chamber 17 in the second direction D2 passes. The opening 24f is located in the center of the drain pan 24 when the drain pan 24 is viewed from the second direction D2. The opening 24f has a substantially rectangular shape when viewed from the second direction D2. The air flowing in the heat exchange chamber 17 in the second direction D2 passes through the opening 24f and flows into the blower chamber 18. The second wall 24b is located outside the first wall 24a when the drain pan 24 is viewed from the second direction D2.

[0034] The receiving portion 24c connects the downstream end of the first wall 24a and the downstream end of the second wall 24b. The receiving portion 24c corresponds to the bottom of the drain pan. The receiving portion 24c is located downstream of the first header 21 and downstream of the second header 22 in the second direction D2. The receiving portion 24c receives condensation water blown off the surfaces of the flat tubes 23, the first header 21, and the second header 22 by the airflow. The condensation water received in the receiving portion 24c falls and is received in the receiving container 19, where it is temporarily stored as drain water. The drain water is discharged from the drain outlet 19d of the receiving container 19.

[0035] 9, the first wall 24a includes a third wall 24h extending in the first direction D1 above the opening 24f when viewed from the second direction D2. In other words, the third wall 24h is a part of the first wall 24a. The third wall 24h is one of the four first walls 24a surrounding the substantially rectangular opening 24f.

[0036] The first header 21 is disposed such that at least a portion of the first header 21 is located above the third wall 24h when viewed from the first direction D1. In other words, the first header 21 is disposed in a position overlapping with the third wall 24h in the second direction D2.

[0037] The third wall 24h has a first surface 24i that is an upper surface that slopes downward in the second direction D2. In other words, the third wall 24h has a portion where the height position of the first surface 24i decreases from the upstream side to the downstream side. The first surface 24i is a surface that comes into contact with the drain water.

[0038] (3) Features The heat exchange unit 20 includes a first header 21 and a second header 22 arranged along the receiving portion 24c of the drain pan 24. In the heat exchange chamber 17 in which the heat exchange unit 20 is arranged, air that exchanges heat with the refrigerant flowing inside the flat tubes 23 flows from the upstream side to the downstream side along the second direction D2. The drain pan 24 is installed on the downstream side of the heat exchange unit 20. The drain pan 24 is installed near the first header 21 and the second header 22 in the second direction D2. The condensation water received in the drain pan 24 and the condensation water that has dropped from the heat exchange unit 20 due to its own weight are received in the water receiving container 19 below the heat exchange unit 20.

[0039] In a heat exchange unit that does not have a drain pan 24, there is a risk that condensation water blown off the surfaces of the multiple flat tubes 23, the first header 21, and the second header 22 by the air flow will flow into the blower chamber 18 downstream of the heat exchange chamber 17 and not be discharged.

[0040] In order to solve this problem, the heat exchange unit 20 of this embodiment includes a drain pan 24 disposed downstream of the first header 21 and the second header 22. Therefore, the condensation water blown off by the airflow from the surfaces of the flat tubes 23, the first header 21, and the second header 22 is received in the drain pan 24. In addition, the drain pan 24 has a configuration in which the first surface 24i of the third wall 24h located above the opening 24f and below the first header 21 is inclined downward toward the second direction D2, which is the direction of the airflow. Therefore, for example, the condensation water that has fallen from the first header 21 onto the first surface 24i flows toward the downstream receiving portion 24c. In FIG. 9, the direction in which the drain water flows on the first surface 24i is indicated by an arrow P1. The drain water flows downstream on the first surface 24i, which prevents the drain water from flowing upstream on the first surface 24i and flowing into the opening 24f. In addition, the flow of the air undergoing heat exchange prevents drain water in drain pan 24 from scattering and flowing into opening 24f. Therefore, air handling unit 10 including heat exchange unit 20 has the effect of preventing drain water from being discharged together with the air undergoing heat exchange.

[0041] -Second embodiment- The heat exchange unit 20 of this embodiment has all the configurations of the heat exchange unit 20 of the first embodiment. Hereinafter, the differences between the heat exchange unit 20 of this embodiment and the heat exchange unit 20 of the first embodiment will be mainly described.

[0042] 10, when the drain pan 24 is viewed from the first direction D1, the third wall 24h has a first surface 24i that extends to the position of the lower end 21a of the first header 21 in the second direction D2. In other words, the upstream end of the third wall 24h extends to the position of the lower end 21a of the first header 21 in the second direction D2. The upstream end of the third wall 24h may extend to a position further upstream than the lower end 21a of the first header 21 in the second direction D2.

[0043] In this embodiment, the condensed water that falls from the first header 21 due to its own weight is received by the first surface 24i of the third wall 24h and flows along the inclined first surface 24i toward the receiving portion 24c. Therefore, the condensed water is prevented from scattering from the first header 21 and flowing into the opening 24f.

[0044] -Third embodiment- The heat exchange unit 20 of this embodiment has all the configurations of the heat exchange unit 20 of the first embodiment. Hereinafter, the differences between the heat exchange unit 20 of this embodiment and the heat exchange unit 20 of the first embodiment will be mainly described.

[0045] In this embodiment, as shown in FIG. 11, when the drain pan 24 is viewed from the first direction D1, the third wall 24h has a first surface 24i that extends to the first position 21b where the first header 21 and the first portion 23a are connected in the second direction D2. In other words, the upstream end of the third wall 24h extends to the first position 21b in the second direction D2. The upstream end of the third wall 24h may extend to a position further upstream than the first position 21b in the second direction D2. As shown in FIG. 11, the first position 21b is the most upstream position among the positions where the first portion 23a of the flat tube 23 is connected to the first header 21.

[0046] In this embodiment, the condensation water blown off the surface of the first header 21 by the airflow is easily received by the first surface 24i of the third wall 24h. Therefore, the condensation water blown off the surface of the first header 21 by the airflow is prevented from flowing into the opening 24f.

[0047] -Fourth embodiment- The heat exchange unit 20 of this embodiment has all the configurations of the heat exchange unit 20 of the first embodiment. Hereinafter, the differences between the heat exchange unit 20 of this embodiment and the heat exchange unit 20 of the first embodiment will be mainly described.

[0048] In this embodiment, as shown in FIG. 10, when the drain pan 24 is viewed from the first direction D1, the third wall 24h has a first surface 24i that extends to the position of the lower end 21a of the first header 21 located most upstream in the second direction D2. In other words, the upstream end of the third wall 24h extends to the position of the lower end 21a of the first header 21 located most upstream in the second direction D2. The upstream end of the third wall 24h may extend to a position further upstream than the lower end 21a of the first header 21 located most upstream in the second direction D2. The most upstream first header 21 is the first header 21 located most upstream among the first headers 21 of the first heat exchange section 40a and the second heat exchange section 40b.

[0049] In this embodiment, the condensed water that falls from the first headers 21 of the first heat exchange section 40a and the second heat exchange section 40b due to their own weight is received by the first surface 24i of the third wall 24h and flows along the inclined first surface 24i toward the receiving portion 24c. Therefore, the condensed water is prevented from scattering from the first headers 21 of the first heat exchange section 40a and the second heat exchange section 40b and flowing into the opening 24f.

[0050] -Fifth embodiment- The heat exchange unit 20 of this embodiment has all the configurations of the heat exchange unit 20 of the first embodiment. Hereinafter, the differences between the heat exchange unit 20 of this embodiment and the heat exchange unit 20 of the first embodiment will be mainly described.

[0051] In this embodiment, as shown in FIG. 11, when the drain pan 24 is viewed from the first direction D1, the third wall 24h has a first surface 24i that extends to a position where the most upstream first header 21 and the first portion 23a are connected in the second direction D2. In other words, the upstream end of the third wall 24h extends to a position where the most upstream first header 21 is connected to the flat tubes 23 in the second direction D2. The upstream end of the third wall 24h may extend to a position further upstream than the position where the most upstream first header 21 is connected to the flat tubes 23 in the second direction D2. The most upstream first header 21 is the first header 21 located most upstream among the first headers 21 of the first heat exchange section 40a and the second heat exchange section 40b.

[0052] In this embodiment, the condensation water blown off the surfaces of the first headers 21 of the first heat exchange section 40a and the second heat exchange section 40b by the airflow is easily received by the first surface 24i of the third wall 24h. Therefore, the condensation water blown off the surfaces of the first headers 21 of the first heat exchange section 40a and the second heat exchange section 40b by the airflow is prevented from flowing into the opening 24f.

[0053] -Sixth embodiment- The heat exchange unit 20 of this embodiment has all the configurations of the heat exchange unit 20 of any one of the first to fifth embodiments. Hereinafter, the differences between the heat exchange unit 20 of this embodiment and the heat exchange unit 20 of the first embodiment will be mainly described.

[0054] In this embodiment, the first surface 24i of the drain pan 24 is further inclined in the first direction D1. For example, the first surface 24i is further inclined to have a downward gradient in the first direction D1. In Fig. 8, a dotted arrow P2 is shown extending from one side of the drain pan 24 to the other side in the first direction D1. In the first direction D1, the height position of the first surface 24i decreases along the direction of the arrow P2.

[0055] In this embodiment, in the first direction D1, the first surface 24i, which is the upper surface of the third wall 24h, has a configuration including a portion that is inclined in the longitudinal direction of the first header 21. This makes it easier for the drain water on the first surface 24i to drop from the first surface 24i and be received in the water receiving container 19, thereby improving the drainage of the drain water in the drain pan 24.

[0056] --Variations-- (1) Variation A In the embodiment, the heat exchange unit 20 has a first heat exchange section 40a and a second heat exchange section 40b. The heat exchange unit 20 may have only one of the first heat exchange section 40a and the second heat exchange section 40b. The heat exchange unit 20 may have three or more heat exchange sections similar to the first heat exchange section 40a and the second heat exchange section 40b. In this case, in the fourth and fifth embodiments, the first header 21 located at the most upstream side is the first header 21 in which the connection section 23c is located at the most upstream side among the first headers 21 of the multiple heat exchange sections.

[0057] (2) Variation B In the embodiment, the first surface 24i of the third wall 24h is inclined downward from the upstream side to the downstream side. The inclination angle of the first surface 24i may change from the upstream side to the downstream side. For example, in order to suppress the inflow of condensed water into the opening 24f, the inclination angle of the first surface 24i may gradually increase from the upstream side to the downstream side.

[0058] (3) Variation C In the embodiment, the receiving vessel 19 has one drainage outlet 19d, but may have multiple drainage outlets 19d. In this case, in order to improve the drainage performance of the receiving vessel 19, it is preferable that the bottom surface of the receiving vessel 19 is inclined.

[0059] -Conclusion- Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure described in the claims. [Explanation of symbols]

[0060] 10: Air handling unit 20: Heat exchange unit 21: First header 22: Second header 23:Flat tube 23a: Part 1 23b: Part 2 23c: Connection 24: Drain pan 24a: 1st wall 24b: 2nd wall 24c: Receiving part 24f: opening 24h: 3rd wall 24i: 1st page 30: Blower unit 40a: First heat exchange section (heat exchange section) 40b: Second heat exchange section (heat exchange section) D1: 1st direction D2 :Second direction [Prior art documents] [Patent documents]

[0061] [Patent Document 1] U.S. Patent No. 5,284,027

Claims

1. A plurality of flat tubes (23) arranged along a first direction (D1) and through which a refrigerant flows; A first header (21) and a second header (22) connected to both ends of the plurality of flat tubes and arranged to extend in the first direction; a drain pan (24) for receiving condensation water from the flat tubes, the first header, and the second header; Equipped with Each of the plurality of flat tubes is a first portion (23a) connected to the first header and extending in a predetermined direction when viewed from the first direction; a second portion (23b) connected to the second header and extending in a predetermined direction when viewed from the first direction; a connection portion (23c) that connects the first portion and the second portion such that an angle between a direction in which the first portion extends and a direction in which the second portion extends is less than 180 degrees when viewed from the first direction; having The flat tubes are arranged such that the first header is located above the connection portion and the connection portion is located above the second header, The drain pan is a first wall (24a) surrounding an opening (24f) through which air flows in a second direction (D2) perpendicular to the extension direction of the drain pan when viewed from the first direction; a second wall (24b) located outside the first wall when viewed from the second direction; a receiving portion (24c) connecting the first wall and the second wall downstream of the first header and downstream of the second header in the second direction; having The first wall includes a third wall (24h) extending in the first direction above the opening when viewed from the second direction, the first header is disposed such that at least a portion of the first header is located above the third wall when viewed from the first direction; The third wall has a first surface (24i) that is an upper surface that is inclined downwardly in the second direction. A heat exchange unit (20).

2. The third wall has the first surface extending to a position of a lower end of the first header in the second direction. The heat exchange unit according to claim 1 .

3. The third wall has the first surface extending in the second direction to a position where the first header and the first portion are connected. The heat exchange unit according to claim 1 .

4. A plurality of heat exchange units (40a, 40b) each having the plurality of flat tubes, the first header, and the second header are arranged along the second direction, The third wall has the first surface extending in the second direction to a position of a lower end of a first header that is closest to the connection portion in the second direction among the first headers of the plurality of heat exchange units. The heat exchange unit according to claim 1 .

5. A plurality of heat exchange units (40a, 40b) each having the plurality of flat tubes, the first header, and the second header are arranged along the second direction, The third wall has the first surface extending in the second direction to a position where the first header of the plurality of first headers of the heat exchange units that is closest to the connection portion in the second direction is connected to the first portion. The heat exchange unit according to claim 1 .

6. The first surface is further inclined in the first direction. A heat exchange unit according to any one of claims 1 to 5.

7. A heat exchange unit (20) according to any one of claims 1 to 5, a blower unit (30) for generating a flow of air flowing in the second direction and exchanging heat with the refrigerant in the heat exchange unit; Equipped with An air handling unit (10).

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