Heat exchange unit and air handling unit

Abstract

To provide a heat exchange unit that can restrain a wind drift even if it comprises a plurality of heat exchangers.SOLUTION: A heat exchange unit (2) comprises a first heat exchanger (3), a second heat exchanger (4), and a drain pan (5). A first heat exchange part and a second heat exchange part are arranged across a first bent part (31c) at 180 degrees or less. A first header (32) is arranged in an end part of the first heat exchange part on the side opposite to the first bent part. A second header (33) is arranged in an end part of the second heat exchange part on the side opposite to the first bent part. A third heat exchange part and a fourth heat exchange part are arranged across a second bent part at 180 degrees or less. The drain pan comprises a first protruding part (55), and a second protruding part (56). The first protruding part extends along the first header and a third header (42) in a first gap (G1) between the first header and the third header. The second protruding part extends along the second header and a fourth header (43) in a second gap (G2) between the second header and the fourth header.SELECTED DRAWING: Figure 7

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] When the heat exchangers of a heat exchange unit are arranged in multiple rows, there is a risk of wind drift. [Means for solving the problem]

[0004] A heat exchange unit according to a first aspect includes a first heat exchanger, a second heat exchanger, and a drain pan. The first heat exchanger has a plurality of first flat tubes, a first header, and a second header. The plurality of first flat tubes include a first heat exchange section and a second heat exchange section. The first heat exchange section and the second heat exchange section are arranged to sandwich a first bent section of 180 degrees or less. The first header is arranged at an end of the first heat exchange section opposite the first bent section. The second header is arranged at an end of the second heat exchange section opposite the bent section. The second heat exchanger has a plurality of second flat tubes, a third header, and a fourth header. The plurality of second flat tubes include a third heat exchange section and a fourth heat exchange section. The third heat exchange section and the fourth heat exchange section are arranged to sandwich a second bent section of 180 degrees or less. The third header is arranged at an end of the third heat exchange section opposite the second bent section. The fourth header is disposed at an end of the fourth heat exchange section opposite the bent section. The second bent section is disposed on the outer side of the bent section of the first bent section. The drain pan receives condensation water from the first heat exchange section and the second heat exchange section. The drain pan has a first protrusion and a second protrusion. The first protrusion extends along the first and third headers into a first gap between the first and third headers. The second protrusion extends along the second and fourth headers into a second gap between the second and fourth headers.

[0005] The heat exchange unit of the first aspect has protrusions extending along the headers in the first gap between the first header and the third header and in the second gap between the second header and the fourth header, thereby making it possible to suppress drift of air even when multiple heat exchangers are provided.

[0006] A heat exchange unit according to a second aspect is the heat exchange unit according to the first aspect, wherein the first protrusion has a first inclined surface and a second inclined surface. The first inclined surface is inclined on a side surface facing the first heat exchange section along the side surface of the first heat exchange section. The second inclined surface is inclined on a side surface facing the third heat exchange section along the angle of the side surface of the third heat exchange section. The second protrusion has a third inclined surface and a fourth inclined surface. The third inclined surface is inclined on a side surface facing the second heat exchange section along the side surface of the second heat exchange section. The fourth inclined surface is inclined on a side surface facing the fourth heat exchange section along the angle of the side surface of the fourth heat exchange section.

[0007] In the heat exchange unit of the second aspect, each protrusion has an inclined surface along the side surface of the opposing heat exchanger, so that the width between the heat exchangers is more stable and drift of air can be suppressed.

[0008] A heat exchange unit according to a third aspect is the heat exchange unit according to the first or second aspect, wherein the drain pan has an opening at a central portion. Among the opening walls defining the opening, the opening walls facing the first heat exchange section and the second heat exchange section have inclined surfaces. The inclined surfaces are inclined along the first heat exchange section and the second heat exchange section, respectively.

[0009] In the heat exchange unit of the third aspect, the opening wall of the drain pan has an inclined surface on the surface facing the heat exchange section, so that the width between the heat exchangers is more stable and drift of air can be suppressed.

[0010] A heat exchange unit according to a fourth aspect is the heat exchange unit according to any one of the first to third aspects, wherein the inner wall surface of the outermost wall of the drain pan, which faces the third heat exchange section and the fourth heat exchange section, has an inclined surface that slopes along the third heat exchange section and the fourth heat exchange section, respectively.

[0011] In the heat exchange unit of the fourth aspect, the inner wall surface of the outermost wall has an inclined surface facing the heat exchange section, so that the width between the heat exchangers is more stable and drift of air can be suppressed.

[0012] A heat exchange unit according to a fifth aspect is the heat exchange unit according to any one of the first to fourth aspects, wherein a plurality of first support parts are arranged on a side surface of the first protrusion. The first support parts are arranged at intervals from each other and support the first header and the third header. A plurality of second support parts are arranged on a side surface of the second protrusion. The second support parts are arranged at intervals from each other and support the second header and the fourth header.

[0013] In the heat exchange unit of the fifth aspect, since the support parts for supporting the headers are disposed on the side surfaces of the protrusions, the headers do not come into direct contact with the bottom surface of the drain pan, and the headers are less likely to be exposed to water. This improves drainage.

[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 a plurality of third support parts are arranged at intervals on an inner wall surface of an outermost peripheral wall of the drain pan, The third support parts support the third header and the fourth header.

[0015] In the heat exchange unit of the sixth aspect, since a plurality of third support parts that support each header are arranged on the inner wall surface of the outermost peripheral wall of the drain pan, the header does not come into direct contact with the bottom surface of the drain pan, and the header is less likely to be exposed to water. Therefore, drainage is improved.

[0016] A heat exchange unit according to a seventh aspect is the heat exchange unit according to any one of the first to sixth aspects, wherein the drain pan has a drain outlet. The drain outlet drains water accumulated in the drain pan. A groove defined by the first or second protrusion, the outermost wall of the drain pan, and the bottom surface of the drain pan, and a groove defined by the first or second protrusion, the opening wall, and the bottom surface of the drain pan are inclined toward the drain outlet.

[0017] In the heat exchange unit according to the seventh aspect, the bottom surface of the drain pan is configured to slope downwardly toward the drain outlet, thereby improving the drainage performance of the drain pan.

[0018] A heat exchange unit according to an eighth aspect includes the heat exchange unit according to any one of the first to seventh aspects and a blower unit.

[0019] The air handling unit according to the eighth aspect can suppress wind deflection. [Brief description of the drawings]

[0020] [Figure 1] 1 is a side view of the interior of an air handling unit 10 of the embodiment, viewed from a first direction D1. [Diagram 2] 1 is a side view of the interior of an air handling unit 10 of the embodiment, as viewed from a third direction D3. [Diagram 3] FIG. 2 is a perspective view of a heat exchange unit 2 according to an embodiment. [Figure 4] 4 is a side view of the heat exchange unit 2 of the embodiment as viewed from a first direction D1. FIG 4 shows a cross-sectional view of the drain pan 5. [Diagram 5] 13 is a top view of the heat exchange unit 2 of the embodiment as viewed from a second direction D2. FIG. [Figure 6] 11 is a side view of the heat exchange unit 2 of the embodiment as viewed from a third direction D3. FIG. [Figure 7] FIG. 2 is a perspective view of a drain pan 5 according to an embodiment. [Figure 8] FIG. 2 is a top view of the drain pan 5 of the embodiment. [Figure 9] 2 is a cross-sectional view of the drain pan 5 of the embodiment as viewed from a first direction D1. FIG. [Figure 10] FIG. 4 is a perspective view of a drain pan 5 of a modified example. [Figure 11] FIG. 4 is a perspective view of a drain pan 5 of a modified example. [Figure 12] FIG. 4 is a perspective view of a drain pan 5 of a modified example. [Figure 13] FIG. 11 is a top view of a drain pan 5 of a modified example. [Figure 14] FIG. 4 is a perspective view of a drain pan 5 of a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] (1) Overall Configuration of Air Handling Unit 10 Air handling unit 10 includes casing 11, support member 12, heat exchange unit 2, and blower unit 30. As shown in Figs. 1 and 2, air handling unit 10 is installed upright with the longitudinal direction of casing 11 aligned vertically. The internal space of casing 11 is partitioned by support member 12 into heat exchange chamber 17 and blower chamber 18. Heat exchange chamber 17 is located above blower chamber 18. Heat exchange unit 2 is installed in heat exchange chamber 17. Blower unit 30 is installed in blower chamber 18.

[0022] An intake port 13 is formed in the upper surface 11a of the casing 11. An exhaust port 14 is formed in the lower surface 11b of the casing 11. An intake duct 15 is connected above the intake port 13. An exhaust duct 16 is connected below 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.

[0023] 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 vertically downward through 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 2 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 2 and has its temperature adjusted.

[0024] (2) Detailed configuration of heat exchange unit 2 The heat exchange unit 2 includes a first heat exchanger 3, a second heat exchanger 4, and a drain pan 5. The heat exchange unit 2 constitutes a part of a refrigerant circuit that performs a vapor compression refrigeration cycle.

[0025] (2-1) 1st heat exchanger 3 The first heat exchanger 3 includes a plurality of first flat tubes 31, a first header 32, a second header 33, and heat transfer fins (not shown).

[0026] (2-1-1) A plurality of first flat tubes 31 As shown in FIG. 1 to FIG. 6, the first flat tubes 31 are arranged in a line along a predetermined direction. Hereinafter, the direction in which the first flat tubes 31 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 first flat tube 31 located in the center in the first direction D1 is omitted. The vertical downward direction is referred to as a second direction D2. The second direction D2 is the direction in which the air flows through the internal space of the casing 11. The 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 horizontal direction. The third direction D3 is the direction in which the drain pan 5 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 first flat tubes 31. A first header 32 and a second header 33 are connected to both ends of the first flat tubes 31.

[0027] Each of the first flat tubes 31 has one first heat exchange section 31a, one second heat exchange section 31b, and one first bent section 31c. As shown in FIG. 4 to FIG. 6, the first heat exchange section 31a and the second heat exchange section 31b are arranged with the first bent section 31c sandwiched between them. The first heat exchange section 31a extends in a predetermined direction when viewed from the first direction D1. The second heat exchange section 31b extends in a predetermined direction different from the direction in which the first heat exchange section 31a extends when viewed from the first direction D1. The first bent section 31c connects the first heat exchange section 31a and the second heat exchange section 31b such that the angle between the direction in which the first heat exchange section 31a extends and the direction in which the second heat exchange section 31b extends when viewed from the first direction D1 is 180 degrees or less. The first bent portion 31c may connect the first heat exchange portion 31a and the second heat exchange portion 31b so that the angle between the extension direction of the first heat exchange portion 31a and the extension direction of the second heat exchange portion 31b is 90 degrees or less.

[0028] The first header 32 is disposed at an end of the first heat exchange section 31a opposite to the first bent portion 31c. That is, one end of the first heat exchange section 31a is connected to the first header 32. The other end of the first heat exchange section 31a is connected to the first bent portion 31c. The second header 33 is disposed at an end of the second heat exchange section 31b opposite to the first bent portion 31c. That is, one end of the second heat exchange section 31b is connected to the second header 33. The other end of the second heat exchange section 31b is connected to the first bent portion 31c. The first flat tubes 31 are disposed such that the first bent portion 31c is located above the first header 32 and the second header 33. Therefore, as shown in FIG. 4, the first flat tubes 31 have a V-shaped shape rotated 180° when viewed from the first direction D1.

[0029] The first heat exchange section 31a and the second heat exchange section 31b are flat tubes having a plurality of passages through which the refrigerant passes. The plurality of passages of the first heat exchange section 31a are arranged side by side along a direction perpendicular to the direction in which the first heat exchange section 31a extends when viewed from the first direction D1. The plurality of passages of the second heat exchange section 31b are arranged side by side along a direction perpendicular to the direction in which the second heat exchange section 31b extends when viewed from the first direction D1. The first bent section 31c is a flat tube partially curved so as to connect the plurality of passages of the first heat exchange section 31a and the plurality of passages of the second heat exchange section 31b, as shown in Figs. 5 and 6.

[0030] 4 to 6, the first heat exchange portion 31a and the second heat exchange portion 31b are arranged such that their main surfaces are aligned along the second direction D2 and the third direction D3. The first heat exchange portion 31a and the second heat exchange portion 31b are arranged at a predetermined interval along the first direction D1 perpendicular to the main surfaces.

[0031] (2-1-2) First header 32 and second header 33 The first header 32 and the second header 33 are connected to both ends of the multiple first flat tubes 31. The first header 32 and the second header 33 are arranged to extend in a first direction D1. The first header 32 and the second header 33 are located above the drain pan 5. The first header 32 and the second header 33 are connected to an external refrigerant circuit via refrigerant piping 25.

[0032] As shown in FIG. 4, the heat exchange unit 2 has a configuration in which the first heat exchanger 3 and the second heat exchanger 4 are arranged along a second direction D2.

[0033] (2-1-3) The heat transfer fins promote heat exchange between the refrigerant flowing inside the first flat tubes 31 and the air carried by the airflow generated by the blower unit 30. The heat transfer fins are corrugated fins. The heat transfer fins are made of aluminum or an aluminum alloy.

[0034] The heat transfer fins are fixed to the first heat exchange section 31a and the second heat exchange section 31b between the first flat tubes 31 adjacent to each other along the first direction D1. More specifically, the heat transfer fins are provided between the first heat exchange sections 31a adjacent to each other along the first direction D1. The heat transfer fins are fixed to the first heat exchange section 31a by fixing the peaks of the corrugations to the main surface of the first heat exchange section 31a. The heat transfer fins are also provided between the second heat exchange sections 31b adjacent to each other along the first direction D1. The heat transfer fins are fixed to the second heat exchange section 31b by fixing the peaks of the corrugations to the main surface of the second heat exchange section 31b. As a result, the first heat exchange section 31a and the second heat exchange section 31b of the first flat tube 31 are covered with the heat transfer fins, except for the first bent section 31c.

[0035] (2-2)Second heat exchanger 4 4, the second heat exchanger 4 is arranged next to the first heat exchanger 3 along the second direction D2. The second heat exchanger 4 is disposed outside the first heat exchanger 3. That is, when viewed from the first direction D1, the second heat exchanger 4 is located outside the first heat exchanger 3. In other words, the upper end of the second heat exchanger 4 is located higher than the upper end of the first heat exchanger 3.

[0036] The structure of the second heat exchanger 4 is similar to that of the first heat exchanger 3. Therefore, the following description of the second heat exchanger 4 will focus on the differences from the first heat exchanger 3.

[0037] The second heat exchanger 4 includes a plurality of second flat tubes 41, a third header 42, and a fourth header 43.

[0038] (2-2-1) A plurality of second flat tubes 41 1 to 6, the second flat tubes 41 are arranged side by side in a predetermined direction. A third header 42 and a fourth header 43 are connected to both ends of the second flat tubes 41.

[0039] Each second flat tube 41 has one third heat exchange section 41a, one fourth heat exchange section 41b, and one second bent section 41c. As shown in FIG. 4 to FIG. 6, the third heat exchange section 41a and the fourth heat exchange section 41b are arranged with the first bent section 31c in between. The second bent section 41c connects the third heat exchange section 41a and the fourth heat exchange section 41b such that the angle between the direction in which the third heat exchange section 41a extends and the direction in which the fourth heat exchange section 41b extends is 180 degrees or less when viewed from the first direction D1. The second bent section 41c may connect the third heat exchange section 41a and the fourth heat exchange section 41b such that the angle between the direction in which the third heat exchange section 41a extends and the direction in which the fourth heat exchange section 41b extends is 90 degrees or less.

[0040] When viewed from the first direction D1, the second bent portion 41c is disposed on the outer side of the first bent portion 31c. The outer side of the bent portion is the side of the first bent portion 31c where the angle between the direction in which the first heat exchange portion 31a extends and the direction in which the second heat exchange portion 31b extends is greater than 180 degrees when viewed from the first direction D1. In other words, the upper end of the second bent portion 41c is located higher than the upper end of the first bent portion 31c.

[0041] The third header 42 is disposed at the end of the third heat exchanger 41a opposite to the second bent portion 41c. That is, one end of the third heat exchanger 41a is connected to the third header 42. The other end of the third heat exchanger 41a is connected to the second bent portion 41c. The fourth header 43 is disposed at the end of the fourth heat exchanger 41b opposite to the second bent portion 41c. That is, one end of the fourth heat exchanger 41b is connected to the fourth header 43. The other end of the fourth heat exchanger 41b is connected to the second bent portion 41c. The second flat tubes 41 are disposed such that the second bent portion 41c is located above the third header 42 and the fourth header 43. Therefore, as shown in FIG. 4, the second flat tubes 41 have a V-shaped shape rotated 180° when viewed from the first direction D1.

[0042] As shown in Figs. 5 and 6, the second bent portion 41c is a flat tube that is partially curved so as to connect the multiple passages of the third heat exchange portion 41a and the multiple passages of the fourth heat exchange portion 41b.

[0043] Fins are arranged in the gaps between the multiple third heat exchangers 41a arranged along the first direction D1. The third heat exchangers 41a and the fins are joined by brazing. Fins are arranged in the gaps between the multiple fourth heat exchangers 41b arranged along the first direction D1. The fourth heat exchangers 41b and the fins are joined by brazing. The fins are, for example, corrugated fins formed by plastically deforming a flat metal plate into a corrugated shape.

[0044] (2-2-2) Third header 42 and fourth header 43 The third header 42 and the fourth header 43 are connected to both ends of the plurality of second flat tubes 41. The third header 42 and the fourth header 43 are disposed so as to extend in the first direction D1.

[0045] (2-3) Drain pan 5 The drain pan 5 receives condensation water from the first flat tubes 31, the first header 32, the second header 33, the second flat tubes 41, the third header 42, the fourth header 43, and the heat transfer fins. The condensation water is water that is generated on the surfaces of the first flat tubes 31, the first header 32, the second header 33, the second flat tubes 41, the third header 42, and the fourth header 43 due to heat exchange between the refrigerant flowing inside the first flat tubes 31 and the second flat tubes 41 and the air passing through the heat exchange chamber 17. The generated condensation water flows down the surfaces of the first flat tubes 31, the first header 32, the second header 33, the second flat tubes 41, the third header 42, and the fourth header 43 due to its own weight, and is received by the drain pan 5. The drain pan 5 is fixed to the support member 12.

[0046] 7 to 9, the drain pan 5 has a first wall (an example of an opening wall) 51, a second wall (an example of an outermost wall) 52, a receiving portion 53, a drain port 54, a first protrusion 55, and a second protrusion 56. The drain pan 5 has an opening 57 in the center. When viewed from the second direction D2, the drain pan 5 has a substantially rectangular shape.

[0047] The first wall 51 defines an opening 57 through which air flowing in the heat exchange chamber 17 in the second direction D2 passes. The opening 57 is located in the center of the drain pan 5 when the drain pan 5 is viewed from the second direction D2. The opening 57 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 57 and flows into the blower chamber 18. The second wall 52 is located outside the first wall 51 when the drain pan 5 is viewed from the second direction D2.

[0048] The first wall 51 facing the first heat exchange portion 31a and the second heat exchange portion 31b has an inclined surface 51a that is inclined along the first heat exchange portion 31a and the second heat exchange portion 31b, respectively.

[0049] The receiving portion 53 connects the lower end of the first wall 51 and the lower end of the second wall 52. The receiving portion 53 corresponds to the bottom of the drain pan 5. The receiving portion 53 is located below the first header 32, the second header 33, the third header 42, and the fourth header 43. However, a part of the receiving portion 53 may be located higher than the height of the first header 32, the second header 33, the third header 42, or the fourth header 43 when viewed in the first direction. The space surrounded by the first wall 51, the second wall 52, and the receiving portion 53 is a space for receiving condensed water and temporarily storing it as drain water. The drain port 54 is formed in the second wall 52. The drain port 54 is formed in a corner of the rectangular shape of the drain pan 5 when the drain pan 5 is viewed from the second direction D2. The drain port 54 is a hole for discharging the drain water stored in the drain pan 5 to the outside of the drain pan 5.

[0050] 9, the receiving portion 53 has a first surface 53a which is an upper surface that slopes downward from the first wall 51 to the second wall 52. In other words, when the drain pan 5 is viewed from the second direction D2, the receiving portion 53 has a portion where the height position of the first surface 53a decreases from the center side where the first wall 51 is located to the outside where the second wall 52 is located. The first surface 53a corresponds to the bottom surface of the drain pan 5. The first surface 53a is the surface that comes into contact with the drain water.

[0051] The first surface 53a may be inclined at least between the first wall 51 extending along the first direction D1 and the second wall 52 extending along the first direction D1. In other words, at least the first surface 53a located below the first header 32, the second header 33, the third header 42, and the fourth header 43 may be inclined downward from the first wall 51 to the second wall 52 in the third direction D3. In FIG. 9, the direction in which the drain water flows on the first surface 53a is indicated by an arrow P1. The drain water flows on the first surface 53a in this manner, so that the drain water can easily reach the drain outlet 54. As a result, the drainage of the drain water in the drain pan 5 is improved.

[0052] 7 and 8, the receiving portion 53 has a third support portion 53b protruding from the first surface 53a. The third support portion 53b supports the first header 32, the second header 33, the third header 42, and the fourth header 43, as shown in FIG.

[0053] 9, the first protrusion 55 is disposed in a first gap G1 between the first header 32 and the third header 42. The first protrusion 55 extends along the first header 32 and the third header 42 in a first direction D1.

[0054] The length of the first protrusion 55 in the first direction D1 is longer than the length of the third support 53b in the first direction D1. The first protrusion 55 may connect the inner walls of the second wall 52 in the first direction D1. The height of the first protrusion 55 is higher than the height of the third support 53b. In this embodiment, the height of the first protrusion 55 is lower than the height of the drain pan 5, but the height of the first protrusion 55 may be the same as the height of the drain pan 5 or higher than the height of the drain pan 5. The width of the first protrusion 55 in the third direction D3 is the same as the width of the gap between the first header 32 and the third header 42 in the third direction D3 or smaller than the width of the gap between the first header 32 and the third header 42 in the third direction D3.

[0055] The first protrusion 55 is substantially a rectangular parallelepiped. However, the bottom surface of the first protrusion 55 is inclined along the first surface 53a of the drain pan 5.

[0056] A side surface of the first protrusion 55 on the first wall 51 side abuts against the first header 32. A side surface of the first protrusion 55 on the second wall 52 side may or may not abut against the third header 42. The height position at which the side surface of the first protrusion 55 abuts against the first header 32 is higher than the height position at which it abuts against the third header 42.

[0057] The first protrusion 55 may be formed integrally with the drain pan 5, or may be attached to the drain pan 5 as a separate member.

[0058] A groove W1 defined by the first protrusion 55, the second wall 52 which is the outermost wall of the drain pan 5, and the first surface 53a which is the bottom surface of the drain pan 5 is inclined toward the drain outlet 54. A groove W2 defined by the first protrusion 55, the first wall 51 which is the opening wall of the drain pan 5, and the first surface 53a which is the bottom surface of the drain pan 5 is inclined toward the drain outlet 54.

[0059] The second protrusion 56 is disposed in a second gap G2 between the second header 33 and the fourth header 43. The second protrusion 56 extends along the second header 33 and the fourth header 43 in the first direction D1.

[0060] The length of the second protrusion 56 in the first direction D1 is longer than the length of the third support portion 53b in the first direction D1. The second protrusion 56 may connect the inner walls of the second wall 52 in the first direction D1. In the present embodiment, the length of the second protrusion 56 is the same as the length of the first protrusion 55, but the length of the second protrusion 56 may be longer or shorter than the first protrusion 55.

[0061] The height of the second protrusion 56 is higher than the height of the third support portion 53b. In this embodiment, the height of the second protrusion 56 is lower than the height of the drain pan 5, but the height of the second protrusion 56 may be the same as the height of the drain pan 5 or higher than the height of the drain pan 5. In this embodiment, the height of the second protrusion 56 is the same as the height of the first protrusion 55, but the height of the second protrusion 56 may be longer or shorter than the height of the first protrusion 55.

[0062] The width of the second protrusion 56 in the third direction D3 is the same as the width of the gap in the third direction D3 between the second header 33 and the fourth header 43 or smaller than the width of the gap in the third direction D3 between the second header 33 and the fourth header 43. In this embodiment, the width of the second protrusion 56 in the third direction D3 is the same as the width of the first protrusion 55 in the third direction D3, but the width of the second protrusion 56 in the third direction D3 may be smaller or larger than the width of the first protrusion 55 in the third direction D3.

[0063] The second protrusion 56 is substantially rectangular parallelepiped in shape. However, the bottom surface of the second protrusion 56 is inclined along the first surface 53a of the drain pan 5.

[0064] A side surface of the second protrusion 56 on the first wall 51 side abuts against the second header 33. A side surface of the second protrusion 56 on the second wall 52 side may or may not abut against the fourth header 43. The height position at which the side surface of the second protrusion 56 abuts against the second header 33 is higher than the height position at which it abuts against the fourth header 43.

[0065] The second protrusion 56 may be formed integrally with the drain pan 5, or may be attached to the drain pan 5 as a separate member.

[0066] A groove W1 defined by the second protrusion 56, the second wall 52 which is the outermost wall of the drain pan 5, and the first surface 53a which is the bottom surface of the drain pan 5 is inclined toward the drain outlet 54. A groove W2 defined by the second protrusion 56, the first wall 51 which is the opening wall of the drain pan 5, and the first surface 53a which is the bottom surface of the drain pan 5 is inclined toward the drain outlet 54.

[0067] (3) Features (3-1) The heat exchange unit 2 is a so-called microchannel type heat exchanger equipped with multiple flat tubes (flat porous tubes) as refrigerant heat transfer tubes and multiple fins inserted into the flat tubes. In the case of a microchannel type heat exchanger, one heat transfer tube is bent at a bending portion in the middle. The multiple bent heat transfer tubes are arranged with a gap between them, and both ends of each heat transfer tube are connected to a header. The surfaces on both sides of the bent portion each become a heat exchange section.

[0068] In a microchannel type heat exchanger, when the heat exchangers are arranged in multiple rows, the angle of the bent parts may change, which may cause drift of the airflow.

[0069] In order to solve this problem, the heat exchange unit 2 of this embodiment has a first protrusion 55 extending along the first header 32 and the third header 42 in the first gap G1 between the first header 32 and the third header 42, and a second protrusion 56 extending along the second and fourth headers in the second gap G2 between the second header 33 and the fourth header 43. This makes it difficult for the positions of the first header 32, the second header 33, the third header 42, and the fourth header 43 to shift, making it easier to maintain a constant distance between the first heat exchanger 3 and the second heat exchanger 4. As a result, even if the heat exchangers are arranged in multiple rows, it is possible to suppress wind drift.

[0070] (3-2) In this embodiment, the first wall 51, which is an opening wall defining the opening 57 of the drain pan 5, has an inclined surface 51a that faces the first heat exchange section and the second heat exchange section. The inclined surface 51a is inclined along the first heat exchange section 31a and the second heat exchange section 31b, respectively.

[0071] In this embodiment, the width between the heat exchangers is more stable, and drift of airflow can be suppressed.

[0072] (3-3) In this embodiment, the groove W1 defined by the first protrusion 55, the second wall 52 which is the outermost wall of the drain pan 5, and the first surface 53a which is the bottom surface of the drain pan 5 has an inclination toward the drain outlet 54. The groove W2 defined by the first protrusion 55, the first wall 51 which is the opening wall of the drain pan 5, and the first surface 53a which is the bottom surface of the drain pan 5 has an inclination toward the drain outlet 54. The groove W1 defined by the second protrusion 56, the second wall 52 which is the outermost wall of the drain pan 5, and the first surface 53a which is the bottom surface of the drain pan 5 has an inclination toward the drain outlet 54. The groove W2 defined by the second protrusion 56, the first wall 51 which is the opening wall of the drain pan 5, and the first surface 53a which is the bottom surface of the drain pan 5 has an inclination toward the drain outlet 54.

[0073] In this embodiment, the first surface 53a, which is the bottom surface of the drain pan 5, has a configuration that slopes downward toward the drain outlet 54 in the first direction D1. This allows the drain water on the first surface 53a to easily flow toward the drain outlet 54. In FIG. 8, a dotted arrow P2 is shown that points from the side opposite the drain outlet 54 toward the side where the drain outlet 54 is located in the first direction D1. In the first direction D1, the height position of the first surface 53a decreases along the direction of the arrow P2.

[0074] In this embodiment, in the first direction D1, the first surface 53a, which is the bottom surface of the drain pan 5, has a configuration that slopes downward toward the drain outlet 54. This allows the drain water on the first surface 53a to easily flow toward the drain outlet 54, improving the drainage of the drain water in the drain pan 5.

[0075] --Variations-- (1) Variation A In the embodiment, the first protrusion 55 and the second protrusion 56 are substantially rectangular parallelepipeds. The shape of the first protrusion 55 and the second protrusion 56 does not have to be substantially rectangular parallelepiped.

[0076] 10, the first protrusion 55 has a first inclined surface 55a and a second inclined surface 55b. The first inclined surface 55a is inclined along the side surface of the first heat exchanger 31a on the side surface facing the first heat exchanger 31a. The second inclined surface 55b is inclined along the angle of the side surface of the third heat exchanger 41a on the side surface facing the third heat exchanger 41a.

[0077] The second protrusion 56 has a third inclined surface 56a and a fourth inclined surface 56b. The third inclined surface 56a is inclined along the side surface of the second heat exchanger 31b on the side surface facing the second heat exchanger 31b. The fourth inclined surface 56b is inclined along the angle of the side surface of the fourth heat exchanger 41b on the side surface facing the fourth heat exchanger 41b.

[0078] In the modification A, the width between the heat exchangers is stable, and drafts are suppressed.

[0079] (2) Variation B The shapes of the first protrusion 55 and the second protrusion 56 may be different from those in the embodiment and the modified example A.

[0080] As shown in FIGS. 11 and 12, the first protrusion 55 and the second protrusion 56 have a convex shape when viewed in the first direction D1.

[0081] Due to the convex shape, the first protrusion 55 and the second protrusion 56 can support the first header 32, the second header 33, the third header 42, and the fourth header 43, so that the first header 32, the second header 33, the third header 42, and the fourth header 43 do not directly contact the bottom surface of the drain pan 5, and the first header 32, the second header 33, the third header 42, and the fourth header 43 are less likely to be exposed to water. This improves drainage.

[0082] (3) Variation C The shapes of the first protrusion 55 and the second protrusion 56 may be different from those in the embodiment, the modified example A, and the modified example B.

[0083] 13, a plurality of first support portions 55c are arranged on the side surface of the first protrusion 55, spaced apart from one another, and support the first header 32 and the third header 42. A second support portion 56c is arranged on the side surface of the second protrusion 56, and supports the second header 33 and the fourth header 43. In the modification C, the first header 32, the second header 33, the third header 42, and the fourth header 43 do not directly contact the bottom surface of the drain pan 5, and the first header 32, the second header 33, the third header 42, and the fourth header 43 are less likely to be exposed to water. Therefore, drainage performance is improved.

[0084] (4) Variation D In the embodiment, the second wall 52, which is the outermost wall of the drain pan 5, is disposed horizontally in the second direction D2.

[0085] As shown in FIG. 14, the inner wall surface of the second wall 52, which is the outermost wall of the drain pan 5, facing the third heat exchange section 41a and the fourth heat exchange section 41b has an inclined surface 52a that inclines along the third heat exchange section 41a and the fourth heat exchange section 41b, respectively.

[0086] In modification D, the width between the heat exchangers is stable, and drafts are suppressed.

[0087] (5) Variation E In the embodiment, the third support portions 53b protruding from the first surface 53a of the receiving portion 53 may be arranged in plurality.

[0088] 13, the multiple third support portions 53b are disposed at intervals from one another on the inner wall surface of the second wall 52, which is the outermost peripheral wall of the drain pan 5. The multiple third support portions 53b support the third header and the fourth header.

[0089] (6) Variation F In the embodiment, the first surface 53a of the receiving portion 53 is inclined downward from the first wall 51 toward the second wall 52. The inclination angle of the first surface 53a may change along the third direction D3. For example, in order to improve the drainage performance of the drain pan 5, the inclination angle of the first surface 53a may gradually increase from the first wall 51 toward the second wall 52.

[0090] (7) Modification G In the embodiment, the drain pan 5 has one drain outlet 54, but may have multiple drain outlets 54. For example, when the drain pan 5 has two drain outlets 54, one drain outlet 54 may be formed in each of the two second walls 52 located at both ends of the drain pan 5 in the first direction D1. In this case, in order to improve the drainage performance of the drain pan 5, it is preferable that the first surface 53a has a configuration that slopes downward in the first direction D1 from the center toward both sides where the two second walls 52 in which the drain outlets 54 are formed are located.

[0091] (8) Variation H In the embodiment, the airflow flows vertically downward, but the direction of the airflow is not limited and may be, for example, vertically upward.

[0092] -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]

[0093] 2: Heat exchange unit 3: 1st heat exchanger 4:Second heat exchanger 5: Drain pan 10: Air handling unit 21: First header 22: Second header 30: Blower unit 31: 1st flat tube 31a: 1st heat exchange section 31b: Second heat exchange section 31c: First bend 32: First header 33: Second header 41:Second flat tube 41a: Third heat exchange section 41b: 4th heat exchange section 41c: Second bend 42: Third header 43: 4th Header 51: 1st wall 52:Second wall 53: Receiving part 54:Drain port 55: 1st protrusion 55a: 1st slope 55b: 2nd slope 55c: 1st support part 56:Second protrusion 56a: 1st slope 56b: 2nd slope 56c: 2nd support part 57: Opening D1: 1st direction D2 :Second direction [Prior art documents] [Patent documents]

[0094] [Patent Document 1] U.S. Patent No. 5,284,027

Claims

1. a first heat exchanger (3) having a plurality of first flat tubes (31) including a first heat exchange section (31a) and a second heat exchange section (31b) arranged with a first bent section (31c) of 180 degrees or less therebetween, a first header (32) arranged at an end of the first heat exchange section opposite the first bent section, and a second header (33) arranged at an end of the second heat exchange section opposite the first bent section; a second heat exchanger (4) including a plurality of second flat tubes (41) including a third heat exchange section (41a) and a fourth heat exchange section (41b) arranged with a second bent section (41c) of 180 degrees or less therebetween, a third header (42) arranged at an end of the third heat exchange section opposite the second bent section, and a fourth header (43) arranged at an end of the fourth heat exchange section opposite the second bent section, the second bent section being arranged on the outer side of the bend of the first bent section; a drain pan (5) for receiving condensation water from the first heat exchange unit and the second heat exchange unit; Equipped with The drain pan has a first protrusion (55) extending along the first and third headers in a first gap (G1) between the first and third headers, and a second protrusion (56) extending along the second and fourth headers in a second gap (G2) between the second and fourth headers. Heat exchange unit (2).

2. The first protrusion has a first inclined surface (55a) on a side surface facing the first heat exchange unit, the first inclined surface inclined along the side surface of the first heat exchange unit, and a second inclined surface (55b) on a side surface facing the third heat exchange unit, the second inclined surface inclined along the angle of the side surface of the third heat exchange unit, The second protrusion has a third inclined surface (56a) on a side surface facing the second heat exchange unit, the third inclined surface (56a) inclined along the side surface of the second heat exchange unit, and a fourth inclined surface (56b) on a side surface facing the fourth heat exchange unit, the fourth inclined surface (56b) inclined along the angle of the side surface of the fourth heat exchange unit. The heat exchange unit according to claim 1 .

3. The drain pan has an opening (57) in the center, Among the opening walls (51) defining the opening, the opening walls facing the first heat exchange section and the second heat exchange section each have an inclined surface (51a) inclined along the first heat exchange section and the second heat exchange section, The heat exchange unit according to claim 1 .

4. Among the inner wall surfaces of the outermost wall (52) of the drain pan, the inner wall surfaces facing the third heat exchange section and the fourth heat exchange section have inclined surfaces (52a) inclined along the third heat exchange section and the fourth heat exchange section, respectively. The heat exchange unit according to claim 1 .

5. A plurality of first support portions (55c) are arranged on a side surface of the first protrusion portion, the first support portions (55c) being spaced apart from each other and supporting the first header and the third header, A second support portion (56c) that supports the second header and the fourth header is disposed on a side surface of the second protrusion portion. The heat exchange unit according to claim 1 .

6. A plurality of third support portions (53b) are arranged on an inner wall surface of the outermost wall of the drain pan at intervals to support the third header and the fourth header. The heat exchange unit according to claim 1 .

7. The drain pan has a drain outlet (54) for draining water accumulated in the drain pan, A groove (W1) defined by the first protrusion or the second protrusion, the outermost wall of the drain pan, and the bottom surface of the drain pan, and a groove (W2) defined by the first protrusion or the second protrusion, the opening wall, and the bottom surface of the drain pan have an inclination toward the drain outlet. The heat exchange unit according to claim 1 .

8. A heat exchange unit according to any one of claims 1 to 7; A blower unit (30); An air handling unit (10) comprising:

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