Heat exchanger

Abstract

A heat exchanger (10) is provided with a heat transfer tube (20) and a plurality of fins (30). The heat transfer tube (20) extends in a first direction. Each fin (30) comprises a main body part (31) and a lantern ring part (32). The collar portion (32) has a first portion (33), a second portion (34), and a third portion (35). The first portion (33) extends in a first direction from the main body portion (31). The second portion (34) extends from the first portion (33) toward the heat transfer tube (20). The third portion (35) extends in the first direction from the second portion (34). The second portion (34) of the first fin (131) is in contact with the tip portion of the collar portion (32) of the adjacent second fin (132). When viewed from the first direction, the second portion (34) has a portion in which the distance between the inner peripheral surface (34a) and the outer peripheral surface (34b) is a first dimension (L1), and a portion in which the distance between the inner peripheral surface (34a) and the outer peripheral surface (34b) is a second dimension (L2). The second dimension (L2) is larger than the first dimension (L1).

Description

Technical Field

[0001] The present invention relates to heat exchangers. Background Art

[0002] Conventionally, as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2015-123458), a heat exchanger for an air conditioner or the like includes a fin having a collar portion. Figure 1 The collar portion 10 has a disc-shaped seat portion 11 , a vertical cylindrical portion 12 above the seat portion 11 , and a flared portion 13 above the vertical cylindrical portion 12 . Summary of the invention

[0003] Problems to be solved by the invention

[0004] The inventors of the present invention have found the following problem: Figure 1 When the fins 1 are stacked, the flared portion 13 of one fin 1 enters the recessed portion of the vertical cylindrical portion 12 of another adjacent fin 1 in the collar portion 10, and water is easily accumulated in the convex space formed in the recessed portion.

[0005] Means for solving problems

[0006] The heat exchanger of the first viewpoint comprises a heat transfer tube and a plurality of fins. The heat transfer tube extends in a first direction. The plurality of fins are stacked in the first direction. The plurality of fins include a main body and a collar. The main body extends in a second direction intersecting the first direction. The collar is for the heat transfer tube to pass through. The collar has a first part, a second part and a third part. The first part extends from the main body in the first direction. The second part extends from the first part toward the heat transfer tube. The third part extends from the second part along the heat transfer tube in the first direction. The second part of the first fin contacts the end part of the collar of the adjacent second fin. When viewed from the first direction, the second part has a portion where the distance between the inner peripheral surface and the outer peripheral surface is a first dimension, and a portion where the distance between the inner peripheral surface and the outer peripheral surface is a second dimension. The second dimension is larger than the first dimension.

[0007] In the heat exchanger of the first viewpoint, water easily accumulates in the convex space formed by the first and second parts of the first fin and the end part of the collar part of the second fin. However, according to the heat exchanger of the first viewpoint, the water accumulated in the space between the part of the first fin having the first size and the end part of the collar part of the second fin can be discharged through the space between the part having the second size and the end part of the collar part of the second fin. Therefore, it is possible to promote the drainage of the space where water easily accumulates.

[0008] The heat exchanger of the second aspect is the heat exchanger of the first aspect, wherein the collar portion further includes a fourth portion. The fourth portion extends from the third portion toward the outer peripheral side. The second portion of the first fin contacts the fourth portion of the adjacent second fin.

[0009] In the heat exchanger according to the second aspect, the plurality of fins can be easily stacked in the first direction by the fourth portion.

[0010] Furthermore, in the heat exchanger of the second aspect, the problem that water easily accumulates in the convex space formed by the fourth portion of the second fin and the first and second portions of the first fin is significant, and therefore the effect brought about by the second portion is significant.

[0011] According to a third aspect, in the heat exchanger of the first aspect or the second aspect, the second dimension is a portion extending along the second direction.

[0012] In the heat exchanger of the third aspect, the portion having the second size is located in the direction in which the main body extends. Therefore, it is easy to achieve a structure in which water in the convex space flows toward the space between the portion having the second size of the first fin and the end of the collar portion of the second fin.

[0013] The heat exchanger of the fourth aspect is a heat exchanger of any one of the first to third aspects, wherein when viewed from the first direction, the second portion has an annular portion and a triangular portion. The annular portion is in the shape of an annulus. The triangular portion is connected to a portion of the annular portion and is in the shape of a triangle. The triangular portion constitutes a portion having a second size.

[0014] In the heat exchanger according to the fourth aspect, it is possible to easily realize a structure in which water in the space between the annular portion of the first fin and the distal end portion of the collar portion of the second fin flows toward the triangular portion.

[0015] A heat exchanger according to a fifth aspect is the heat exchanger according to the fourth aspect, wherein the triangular portion is disposed at a lower end portion of the second portion.

[0016] In the heat exchanger according to the fifth aspect, since the portion having the second size is located at the lower end portion, water in the convex space can be discharged downward.

[0017] A heat exchanger according to a sixth aspect is the heat exchanger according to any one of the first to fifth aspects, wherein the fins are provided with drainage ribs extending from a convex space formed by the first and second portions of the first fin and the distal end of the collar portion of the second fin.

[0018] In the heat exchanger according to the sixth aspect, a structure for draining water in the convex space can be realized by the drain ribs.

[0019] A heat exchanger according to a seventh aspect is the heat exchanger according to the sixth aspect, wherein the drainage rib is connected to the portion having the second size.

[0020] In the heat exchanger of the seventh aspect, water accumulated in the space between the portion of the first fin having the first size and the tip of the collar portion of the second fin can be discharged from the drainage rib via the space between the portion of the first fin having the second size and the tip of the collar portion of the second fin.

[0021] The heat exchanger according to an eighth aspect is the heat exchanger according to the sixth aspect or the seventh aspect, wherein the drain rib is provided on the main body portion, and the drain rib protrudes in the first direction to the second portion.

[0022] In the heat exchanger according to the eighth aspect, water in the convex space can be easily guided to the drainage rib.

[0023] A heat exchanger according to a ninth aspect is the heat exchanger according to any one of the sixth to eighth aspects, wherein the fin includes a plurality of collar portions, and the drainage rib extends in the second direction from the first collar portion to the lower collar portion.

[0024] In the heat exchanger according to the ninth aspect, water in the convex space of the collar portion at the upper layer can be guided to the convex space of the collar portion at the lower layer by the drainage ribs.

[0025] A heat exchanger according to a tenth aspect is the heat exchanger according to any one of the first to ninth aspects, wherein the heat exchanger is included in an indoor unit of an air-conditioning apparatus.

[0026] The heat exchanger according to the tenth aspect can be applied to a heat exchanger of an indoor unit of an air-conditioning apparatus. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic configuration diagram of an air conditioning apparatus including a heat exchanger according to an embodiment of the present disclosure.

[0028] Figure 2 It is a cross-sectional view of a heat exchanger according to one embodiment of the present disclosure.

[0029] Figure 3 This is a perspective view of the fins constituting the heat exchanger as seen from the front.

[0030] Figure 4 This is a plan view of the fins constituting the heat exchanger as viewed from the rear.

[0031] Figure 5 This is a plan view of the vicinity of a collar portion of a heat exchanger as viewed from the front.

[0032] Figure 6 is Figure 5 The third and fourth parts are omitted and the second part is shaded.

[0033] Figure 7 It is along Figure 5Cross-sectional view along line VII-VII.

[0034] Figure 8 It is along Figure 5 Cross-sectional view along line VIII-VIII in FIG.

[0035] Fig. 9 It is along Figure 5 Cross-sectional view along line IX-IX.

[0036] Fig.10 This is a bottom view of the fins constituting the heat exchanger as seen from below.

[0037] Fig.11 Yes means Figure 4 Diagram of the flow of water in the water.

[0038] Fig.12 This is a photograph of the vicinity of the conventional collar portion as viewed from the front.

[0039] Fig.13 This is a photograph showing the vicinity of a plurality of conventional collar portions as viewed from the right side.

[0040] Fig.14 This is a plan view of the vicinity of a collar portion of a heat exchanger according to a modified example as viewed from the front. DETAILED DESCRIPTION

[0041] (1) Air conditioning unit

[0042] Reference Figure 1 An air conditioning device including a heat exchanger according to an embodiment of the present disclosure will be described. Figure 1 As shown, the air-conditioning device 200 is a device used for cooling and heating the interior of a building or the like by performing a vapor compression refrigeration cycle operation.

[0043] The air conditioning device 200 mainly includes an outdoor unit 220, an indoor unit 230, a liquid refrigerant communication pipe 240 and a gas refrigerant communication pipe 250 connecting the outdoor unit 220 and the indoor unit 230. In addition, the vapor compression refrigerant circuit 210 of the air conditioning device 200 is formed by connecting the outdoor unit 220 and the indoor unit 230 via the liquid refrigerant communication pipe 240 and the gas refrigerant communication pipe 250.

[0044] (1-1) Outdoor unit

[0045] The outdoor unit 220 is installed outdoors and mainly includes a compressor 221 , a flow path switching mechanism 222 , an outdoor heat exchanger 223 , and an expansion mechanism 224 .

[0046] The compressor 221 is a mechanism that compresses low-pressure refrigerant in the refrigeration cycle to high pressure.

[0047] The flow switching mechanism 222 is a mechanism for switching the flow direction of the refrigerant when switching between cooling operation and heating operation. In cooling operation, the flow switching mechanism 222 connects the discharge side of the compressor 221 to the gas side of the outdoor heat exchanger 223, and connects the gas side of the indoor heat exchanger 231 (described later) to the suction side of the compressor 221 via the gas refrigerant connecting pipe 250 (see Figure 1 In addition, during heating operation, the flow switching mechanism 222 connects the discharge side of the compressor 221 to the gas side of the indoor heat exchanger 231 via the gas refrigerant communication pipe 250, and connects the gas side of the outdoor heat exchanger 223 to the suction side of the compressor 221 (see Figure 1 222 in the flow path switching mechanism 222).

[0048] The outdoor heat exchanger 223 is a heat exchanger that functions as a radiator of the refrigerant during cooling operation and as an evaporator of the refrigerant during heating operation. The liquid side of the outdoor heat exchanger 223 is connected to the expansion mechanism 224 , and the gas side is connected to the flow path switching mechanism 222 .

[0049] The expansion mechanism 224 is a mechanism that decompresses the high-pressure liquid refrigerant after dissipating heat in the outdoor heat exchanger 223 before being sent to the indoor heat exchanger 231 during cooling operation, and decompresses the high-pressure liquid refrigerant after dissipating heat in the indoor heat exchanger 231 before being sent to the outdoor heat exchanger 223 during heating operation.

[0050] Furthermore, the outdoor unit 220 is provided with an outdoor fan 225 for sucking outdoor air into the outdoor unit 220 , supplying the outdoor air to the outdoor heat exchanger 223 , and then exhausting the outdoor air to the outside of the outdoor unit 220 .

[0051] (1-2) Indoor unit

[0052] The indoor unit 230 is installed indoors and mainly includes an indoor heat exchanger 231 and an indoor fan 232 .

[0053] The indoor heat exchanger 231 is a heat exchanger that functions as an evaporator of the refrigerant during cooling operation and as a radiator of the refrigerant during heating operation. The liquid side of the indoor heat exchanger 231 is connected to the liquid refrigerant communication pipe 240, and the gas side is connected to the gas refrigerant communication pipe 250.

[0054] Furthermore, the indoor unit 230 is provided with an indoor fan 232 for sucking indoor air into the indoor unit 230 , supplying the indoor air to the indoor heat exchanger 231 , and then exhausting the indoor air to the outside of the indoor unit 230 .

[0055] (1-3) Action

[0056] (1-3-1) Refrigeration operation

[0057] When the air conditioner 200 performs cooling operation, the low-pressure refrigerant in the refrigeration cycle is sucked into the compressor 221, and is discharged after being compressed to the high pressure in the refrigeration cycle. The high-pressure refrigerant discharged from the compressor 221 is sent to the outdoor heat exchanger 223 through the flow path switching mechanism 222. The high-pressure refrigerant sent to the outdoor heat exchanger 223 exchanges heat with the outdoor air supplied by the outdoor fan 225 in the outdoor heat exchanger 223 to dissipate heat. The high-pressure refrigerant after dissipating heat in the outdoor heat exchanger 223 is sent to the expansion mechanism 224 and is decompressed to the low pressure in the refrigeration cycle. The low-pressure refrigerant after being decompressed in the expansion mechanism 224 is sent to the indoor heat exchanger 231 through the liquid refrigerant communication pipe 240. The low-pressure refrigerant sent to the indoor heat exchanger 231 exchanges heat with the indoor air supplied by the indoor fan 232 in the indoor heat exchanger 231 and evaporates. As a result, the indoor air is cooled and blown into the room. The low-pressure refrigerant evaporated in the indoor heat exchanger 231 is sucked into the compressor 221 again through the gas refrigerant communication pipe 250 and the flow path switching mechanism 222 .

[0058] (1-3-2) Heating operation

[0059] When the air conditioner 200 performs heating operation, the low-pressure refrigerant in the refrigeration cycle is sucked into the compressor 221, and is discharged after being compressed to the high pressure in the refrigeration cycle. The high-pressure refrigerant discharged from the compressor 221 is sent to the indoor heat exchanger 231 through the flow path switching mechanism 222 and the gas refrigerant communication pipe 250. The high-pressure refrigerant sent to the indoor heat exchanger 231 exchanges heat with the indoor air supplied by the indoor fan 232 in the indoor heat exchanger 231 to dissipate heat. As a result, the indoor air is heated and blown indoors. The high-pressure refrigerant after dissipating heat in the indoor heat exchanger 231 is sent to the expansion mechanism 224 through the liquid refrigerant communication pipe 240 and is decompressed to the low pressure in the refrigeration cycle. The low-pressure refrigerant after being decompressed in the expansion mechanism 224 is sent to the outdoor heat exchanger 223. The low-pressure refrigerant sent to the outdoor heat exchanger 223 exchanges heat with the outdoor air supplied by the indoor fan 232 in the outdoor heat exchanger 223 and evaporates. The low-pressure refrigerant evaporated in the outdoor heat exchanger 223 is sucked into the compressor 221 again through the flow switching mechanism 222 .

[0060] (2) Heat exchanger

[0061] (2-1) Overall structure

[0062] Reference Figures 1 to 11A heat exchanger 10 according to an embodiment of the present disclosure is described. It should be noted that in the following description, expressions such as "up", "down", "left", "right", "front", and "rear" are appropriately used to indicate directions, which indicate directions in a state of normal use and are not intended to be limiting.

[0063] The heat exchanger 10 of this embodiment includes Figure 1 The indoor unit 230 of the air conditioning device 200 is shown in FIG. Figure 1 The indoor heat exchanger 231 shown. The heat exchanger 10 of the present embodiment is a cross-fin-tube heat exchanger.

[0064] like Figure 2 As shown, the heat exchanger 10 includes a heat transfer tube 20 and a plurality of fins 30. The heat transfer tube 20 extends in a first direction. The fins 30 are stacked in the first direction. The first direction here is a front-to-back direction. The heat exchanger 10 performs heat exchange between the refrigerant flowing in the heat transfer tube 20 and the air flowing outside the heat transfer tube 20. The heat exchanger 10 performs heat exchange between the air and the refrigerant without mixing with each other.

[0065] (2-2) Detailed structure

[0066] (2-2-1) Heat transfer tube

[0067] The heat exchanger 10 of this embodiment includes a plurality of heat transfer tubes 20. The plurality of heat transfer tubes 20 are arranged in a second direction. The second direction intersects the first direction. The second direction is orthogonal to the first direction. Specifically, the second direction is a vertical direction.

[0068] The heat transfer pipe 20 allows the refrigerant to flow therein. The heat transfer pipe 20 has a cylindrical shape. Here, the heat transfer pipe 20 is a round pipe.

[0069] The heat transfer tube 20 has a through hole through which the refrigerant that exchanges heat with the indoor air in the heat exchanger 10 passes. The through hole of the heat transfer tube 20 extends along a first direction. Here, the first direction is the longitudinal direction of the heat transfer tube 20. The heat transfer tube 20 is made of, for example, aluminum or an aluminum alloy.

[0070] (2-2-2) Fin

[0071] The fins 30 increase the heat transfer area between the heat transfer tube 20 and the indoor air, thereby promoting heat exchange between the refrigerant and the indoor air. The fins 30 are in contact with the heat transfer tube 20. The fins 30 are made of, for example, aluminum or an aluminum alloy.

[0072] The plurality of fins 30 are arranged in a first direction. The fins 30 are arranged so as to intersect (orthogonally in this case) the extending direction of the heat transfer tube 20. In this embodiment, the plurality of fins 30 are arranged in parallel and at equal intervals. Figure 2In FIG. 1 , two adjacent fins 30 are represented as a first fin 131 and a second fin 132 .

[0073] The fin 30 has Figure 3 A surface 30a and Figure 4 Here, one surface 30a is a front surface when viewed from the front in the first direction, and the other surface 30b is a rear surface when viewed from the rear in the first direction.

[0074] like Figure 2 to Figure 10 As shown, the plurality of fins 30 include a main body 31 and a collar 32. The main body 31 extends in a second direction intersecting the first direction. Here, the main body 31 extends in a second direction orthogonal to the first direction, that is, in an up-down direction. In this embodiment, the up-down direction is the direction of gravity. The main body 31 is a flat plate-shaped component.

[0075] like Figure 3 and Figure 4 As shown, a cutout 31a for promoting heat transfer is formed in the main body 31. A plurality of cutouts 31a are arranged in a third direction orthogonal to the first direction. Here, the third direction is the left-right direction. And the cutout 31a extends in the second direction. Here, the cutout 31a protrudes forward. In other words, the cutout 31a protrudes from one surface 30a toward another surface 30b of the adjacent fin 30.

[0076] like Figure 2 As shown, the collar portion 32 is used for the heat transfer tube 20 to pass through. In detail, the collar portion 32 has a through hole for the heat transfer tube 20 to pass through.

[0077] like Figure 2 to Figure 10 As shown, the collar portion 32 has a first portion 33, a second portion 34, a third portion 35 and a fourth portion 36. The first portion 33, the second portion 34, the third portion 35 and the fourth portion 36 are formed by one component. Here, the first portion 33, the second portion 34, the third portion 35 and the fourth portion 36 are formed by nesting.

[0078] The first portion 33 extends from the main body portion 31 in the first direction. Here, the first portion 33 is orthogonal to the main body portion 31.

[0079] The second portion 34 extends from the first portion 33 toward the heat transfer tube 20. In other words, the second portion 34 extends in the second direction. Here, the second portion 34 is orthogonal to the first portion 33. The second portion will be described later.

[0080] The third portion 35 extends from the second portion 34 in the first direction along the heat transfer tube 20. The third portion 35 is in contact with the heat transfer tube 20. Here, the third portion 35 is orthogonal to the second portion 34.

[0081] The fourth portion 36 extends from the third portion 35 toward the outer peripheral side. In other words, the fourth portion 36 extends in the second direction. Here, the fourth portion 36 is orthogonal to the third portion 35.

[0082] like Figure 2 As shown, the second portion 34 of the first fin 131 contacts the tip portion of the collar portion 32 of the adjacent second fin 132. Here, the second portion 34 of the first fin contacts the fourth portion 36 of the adjacent second fin. The second portion 34 and the fourth portion 36 extend in the same direction.

[0083] Here, the second part 34 is described. Figure 5 as well as Figure 6 As shown, in the first direction (in Figure 5 as well as Figure 6 When viewed from the front (in the figure), the second portion 34 has a portion where the distance between the inner circumference 34a and the outer circumference 34b is the first dimension L1, and a portion where the distance between the inner circumference 34a and the outer circumference 34b is the second dimension L2. Figure 6 to Figure 8 As shown, the second dimension L2 is larger than the first dimension L1.

[0084] exist Figure 6 In the embodiment, the first dimension L1 is the dimension of the portion extending along the third direction orthogonal to the first direction. Specifically, the portion having the first dimension L1 is located at least at the left end and the right end. Here, the portion having the first dimension L1 is the portion of the second portion 34 where the triangular portion 34d described later is not configured.

[0085] The second dimension L2 is the dimension of the portion extending along the second direction. Specifically, the portion having the second dimension L2 is located at least one of the upper end and the lower end. Here, the portion having the second dimension L2 is the upper end and the lower end of the second portion 34.

[0086] In this embodiment, when the Figure 5 and Figure 6 In other words, when viewed from the first direction (in the front), the second portion 34 has a water drop shape. Figure 5 and Figure 6 When viewed from the front (center), the second portion 34 has a circular ring portion 34c and a triangular portion 34d. The triangular portion 34d is connected to a portion of the circular ring portion 34c. Figure 5 and Figure 6 In FIG. 3 , the triangular portion 34d has a V-shape.

[0087] The annular portion 34c is a region surrounded by two concentric circles. The annular portion 34c is located throughout the entire circumference of the second portion 34. The portion having the first dimension L1 is formed only by the annular portion 34c without the triangular portion 34d. Therefore, the first dimension L1 of the present embodiment is a constant value.

[0088] The portion having the second dimension L2 is constituted by the triangular portion 34d and the annular portion 34c. Therefore, the second dimension L2 of the present embodiment is not a constant value. Specifically, the second dimension L2 is a value larger than the first dimension L1 of the annular portion 34c, and the value varies depending on the position. The maximum value of the second dimension L2 is, for example, more than twice the first dimension L1. The maximum value of the second dimension L2 here is the distance extending from the upper end of the second portion 34 to the bottom (inner peripheral surface 34a), and the distance extending from the lower end of the second portion 34 to the top (inner peripheral surface 34a).

[0089] The triangular portion 34d is disposed at the lower end of the second portion 34. Specifically, the triangular portion 34d has a shape extending downward. Here, the triangular portion 34d is also disposed at the upper end of the second portion 34. Specifically, the triangular portion 34d also has a shape extending upward.

[0090] In addition, the first dimension L1 is, for example, not less than 0.5 mm and not more than 0.9 mm. The second dimension L2 is, for example, not less than 1.0 mm and not more than 1.9 mm. The maximum value of the second dimension L2 is, for example, not less than 1.5 mm and not more than 1.9 mm.

[0091] like Figure 3 to Figure 6 , Fig. 9 as well as Fig.10 As shown in FIG. 1 , the fin 30 is provided with a drainage rib 130. The drainage rib 130 extends from a convex space S. The convex space S is formed by Figure 2 The first portion 33 and the second portion 34 of the first fin 131 shown are formed at the distal end of the collar portion 32 of the second fin 132. The drainage rib 130 causes the water in the convex space S to flow in the second direction (here, downward).

[0092] The convex space S of this embodiment is formed by the first portion 33 and the second portion 34 of the first fin 131 and the fourth portion 36 of the second fin 132. Figure 2 The fourth portion 36 in the figure enters the recessed portion around the collar portion 32 of the first fin 131 adjacent to the second fin 132, and a convex space S is formed in the recessed portion.

[0093] Specifically, when viewed from the first direction (here, the front), the convex space S has a teardrop shape. In other words, when viewed from the first direction, the convex space S has a circular ring-shaped space and a triangular space. The circular ring-shaped space is provided on the entire circumference. The triangular space is connected to the circular ring-shaped space. The triangular space of this embodiment is provided at the upper end and the lower end.

[0094] In addition, the convex space S formed by the portion having the first dimension L1 of the first portion 33 and the second portion 34 of the first fin 131 and the fourth portion 36 of the second fin 132 is, for example, 0.1 mm or more and 0.3 mm or less. The convex space S formed by the portion having the second dimension L2 of the first portion 33 and the second portion 34 of the first fin 131 and the fourth portion 36 of the second fin 132 is, for example, 0.4 mm or more and 1.4 mm or less. The convex space S formed by the portion having the maximum value of the second dimension L2 of the first portion 33 and the second portion 34 of the first fin 131 (the upper end and the lower end) and the fourth portion 36 of the second fin 132 is, for example, 1.1 mm or more and 1.4 mm or less.

[0095] like Figure 3 , Figure 4 as well as Fig. 9 As shown in FIG. 1 , the drainage rib 130 is provided on the main body 31. Figure 3 , Figure 4 , Fig. 9 and Fig.10 As shown in FIG. 1 , the drainage rib 130 protrudes in the first direction. Here, the drainage rib 130 protrudes forward. Specifically, the drainage rib 130 protrudes from one surface 30a toward the other surface 30b of the adjacent fin 30. In this embodiment, as shown in FIG. Fig. 9 and Fig.10 As shown, the drainage rib 130 protrudes in the first direction to the second portion 34. In other words, the height of the drainage rib 130 in the first direction is the same as the height of the second portion 34. In further other words, the position of the drainage rib 130 in the first direction is the same as the position of the second portion 34 in the first direction.

[0096] Specifically, if Figure 3 and Fig.10 As shown, when viewed from a side 30a (front surface), the drainage rib 130 is in a mountain shape. Figure 4 and Fig.10 As shown in FIG. 1 , the drainage rib 130 is in a groove shape when viewed from the other surface 30b (rear surface). The drainage rib 130 of the present embodiment has a V shape when viewed from the bottom.

[0097] like Figure 3 and Figure 4As shown, the drainage rib 130 extends in the second direction. In the present embodiment, the drainage rib 130 extends in the up-down direction, here, in the gravity direction.

[0098] Specifically, the drainage rib 130 extends in the second direction from the first collar portion 32 to the lower collar portion 32. Here, in the first collar portion 32 and the second collar portion 32 adjacent in the up-down direction, the drainage rib 130 extends from the lower end of the second portion of the upper first collar portion 32 to the upper end of the second portion 34 of the lower second collar portion.

[0099] The drainage rib 130 is connected to the portion having the second dimension L2 of the second portion 34. Specifically, the drainage rib 130 is connected to the triangular portion 34d of the second portion 34. More specifically, the drainage rib 130 is connected to the sharp portion of the triangular portion 34d of the second portion 34. The drainage rib 130 extends from the triangular space of the convex space S.

[0100] (2-3) Action

[0101] exist Figure 1 When the air conditioner 200 shown in the figure is in cooling operation, heating operation, etc., in the refrigerant circuit 210, the refrigerant is sent to the heat transfer tube 20 of the heat exchanger 10 as the indoor heat exchanger 231. Then, the refrigerant flowing in the through hole of the heat transfer tube 20 exchanges heat with the indoor air flowing outside the heat transfer tube 20. At this time, condensed water (hereinafter also referred to as water) is sometimes generated on the fin 30. This water is easily accumulated in the convex space S formed by the first part 33 and the second part 34 of the first fin 131 and the fourth part 36 as the terminal part of the collar part 32 of the second fin 132.

[0102] In contrast, the second portion 34 of the fin 30 of the present embodiment has a portion where the distance between the inner circumferential surface 34a and the outer circumferential surface 34b is the first dimension L1, and a portion where the distance between the inner circumferential surface 34a and the outer circumferential surface 34b is the second dimension L2 larger than the first dimension L1. With this structure, water accumulated in the space between the portion having the first dimension L1 of the first fin 131 and the fourth portion 36 of the second fin 132 can be guided to the space between the portion having the second dimension L2 and the fourth portion 36 of the second fin 132.

[0103] Furthermore, the fin 30 of the present embodiment has a drainage rib 130 extending from a convex space S formed by the first portion 33 and the second portion 34 of the first fin 131 and the fourth portion 36 as the terminal end of the collar portion 32 of the second fin 132. Since the drainage rib 130 extends from the convex space S, water accumulated in the convex space S can be guided to the drainage rib 130. The water is discharged through the drainage rib 130.

[0104] Specifically, if Fig.11 As shown, water accumulated in the annular space between the portion having the first dimension L1 of the first fin 131 and the fourth portion 36 of the second fin 132 in the convex space S is guided to the triangular space between the portion having the second dimension L2 and the fourth portion 36 of the second fin 132 below. Since the drainage rib 130 is connected to the portion having the second dimension L2, the water guided to the triangular space formed by the portion having the second dimension L2 is further guided to the drainage rib 130. Thus, the water flows along the groove formed on the other surface 30b side of the drainage rib 130 toward the collar portion 32 below. In this way, the condensed water attached to the fin 30 flows downward.

[0105] (3) Features

[0106] (3-1)

[0107] The inventors of the present invention have discovered a problem that is unique to the heat exchanger 10, which includes a collar portion 32 having a first portion 33, a second portion 34, and a third portion 35, and the second portion 34 of the first fin 131 contacts the end portion of the collar portion 32 of the adjacent second fin 132. Specifically, Fig.12 and Fig.13 As shown, the inventors of the present invention have discovered the following problem: in the conventional fin 330 without the portion of the second size L2, water is easily accumulated in the convex space S formed by the first portion 33 and the second portion 34 of the first fin 131 and the terminal portion of the collar portion 32 of the second fin 132. In order to solve this problem, the inventors conducted in-depth research and conceived the heat exchanger 10 of the present embodiment.

[0108] The heat exchanger 10 of this embodiment includes a heat transfer tube 20 and a plurality of fins 30. The heat transfer tube 20 extends in a first direction. The plurality of fins 30 are stacked in the first direction. The plurality of fins 30 include a main body 31 and a collar 32. The main body 31 extends in a second direction intersecting the first direction. The collar 32 allows the heat transfer tube 20 to pass through. The collar 32 includes a first portion 33, a second portion 34, and a third portion 35. The first portion 33 extends from the main body 31 in the first direction. The second portion 34 extends from the first portion 33 toward the heat transfer tube 20. The third portion 35 extends from the second portion 34 along the heat transfer tube 20 in the first direction. The second portion 34 of the first fin 131 contacts the tip end portion of the collar 32 of the adjacent second fin 132. When viewed from the first direction, the second portion 34 includes a portion where the distance between the inner peripheral surface 34a and the outer peripheral surface 34b is a first dimension L1, and a portion where the distance between the inner peripheral surface 34a and the outer peripheral surface 34b is a second dimension L2. The second dimension L2 is larger than the first dimension L1.

[0109] According to the heat exchanger 10 of this embodiment, water accumulated in the space between the portion having the first size L1 of the first fin 131 and the end portion of the collar portion 32 of the second fin 132 can be discharged through the space between the portion having the second size L2 of the first fin 131 and the end portion of the collar portion 32 of the second fin 132. Therefore, drainage of the convex space S where water is easily accumulated can be promoted.

[0110] This can prevent water from accumulating in the fins 30 and improve drainage, thereby reducing the continuous wet state of the heat exchanger 10. Therefore, corrosion of the heat transfer tubes 20 and the fins 30 can be suppressed. In addition, mold growth in the heat exchanger 10 can be suppressed, thereby reducing the problem of odor.

[0111] (3-2)

[0112] In the heat exchanger 10 of the present embodiment, the collar portion 32 further includes a fourth portion 36. The fourth portion 36 extends toward the outer peripheral side from the third portion 35. The second portion 34 of the first fin 131 is in contact with the fourth portion 36 of the adjacent second fin 132.

[0113] Here, the fourth portion 36 allows the plurality of fins 30 , 131 , and 132 to be easily stacked in the first direction.

[0114] Furthermore, since water easily accumulates in the convex space S formed by the fourth portion 36 of the second fin 132 and the first portion 33 and the second portion 34 of the first fin 131 , the second portion 34 of the present embodiment has a significant effect.

[0115] (3-3)

[0116] In the heat exchanger 10 of the present embodiment, the second dimension L2 is a portion extending along the second direction.

[0117] Here, the portion having the second size L2 is located in the extending direction of the main body 31. Therefore, it is easy to realize a structure in which water in the convex space S flows toward the space between the portion having the second size L2 of the first fin 131 and the tip of the collar portion 32 of the second fin 132.

[0118] (3-4)

[0119] In the heat exchanger 10 of this embodiment, when viewed from the first direction, the second portion 34 has an annular portion 34c and a triangular portion 34d. The annular portion 34c is annular in shape. The triangular portion 34d is connected to a portion of the annular portion 34c and is triangular in shape. The triangular portion 34d constitutes a portion having a second size L2.

[0120] Here, a configuration in which water in a space between the annular portion 34 c of the first fin 131 and the distal end portion of the collar portion 32 of the second fin 132 flows toward the triangular portion 34 d can be easily achieved.

[0121] (3-5)

[0122] In the heat exchanger 10 of the present embodiment, the triangular portion 34 d is disposed at the lower end portion of the second portion 34 .

[0123] Here, since the portion having the second size L2 is located at the lower end, the water in the convex space S can be discharged downward.

[0124] (3-6)

[0125] In the heat exchanger 10 of the present embodiment, the triangular portions 34 d are arranged at the upper end portion and the lower end portion of the second portion 34 .

[0126] Here, since the portion having the second size L2 is located at the upper end, water from above easily flows to the left and right annular portions 34c. The water flows from the left and right annular portions 34c to the triangular portion 34d located at the lower end. Therefore, the water in the convex space S can be smoothly discharged downward.

[0127] (3-7)

[0128] In the heat exchanger 10 of this embodiment, the fin 30 is provided with the drainage rib 130. The drainage rib 130 extends from a convex space S formed by the first portion 33 and the second portion 34 of the first fin 131 and the distal end of the collar portion 32 of the second fin 132.

[0129] In the heat exchanger 10 of the present embodiment, the drainage ribs 130 can realize a structure for draining water in the convex space S.

[0130] (3-8)

[0131] In the heat exchanger 10 of the present embodiment, the drainage rib 130 is connected to the portion having the second dimension L2.

[0132] In this way, the fin 30 has a structure that guides water from the portion of the second dimension L2 to the drain rib 130. Therefore, the water in the convex space S can be easily guided to the drain rib 130.

[0133] (3-9)

[0134] In the heat exchanger 10 of the present embodiment, the drain rib 130 is provided on the main body portion 31. The drain rib 130 protrudes to the second portion 34 in the first direction.

[0135] Thereby, the water in the convex space S can be easily guided to the drainage rib 130 .

[0136] (3-10)

[0137] In the heat exchanger 10 of the present embodiment, the fin 30 includes a plurality of collar portions 32. The drainage rib 130 extends from the first collar portion 32 to the lower collar portion 32 in the second direction.

[0138] Here, water in the convex space S of the collar portion 32 of the upper layer can be guided to the convex space S of the collar portion 32 of the lower layer by the drainage ribs 130 .

[0139] (3-11)

[0140] In the heat exchanger 10 of the present embodiment, the heat exchanger 10 is included in the indoor unit 230 of the air-conditioning apparatus 200. Thus, the heat exchanger 10 of the present embodiment is suitable for use in the indoor heat exchanger 231 disposed indoors.

[0141] (4) Modification

[0142] (4-1) Modification 1

[0143] In the above-mentioned embodiment, the portion having the second size L2 (in Figure 3 to Figure 6 The triangular portion 34d is disposed at both ends in the second direction, but is not limited thereto. Fig.14 As shown, the portion having the second size L2 is only arranged at the lower end. In other words, the triangular portion 34d is not arranged at the upper end but only at the lower end.

[0144] (4-2) Modification 2

[0145] In the above-mentioned embodiment, when viewed from the first direction, the triangular space of the convex space S is provided at both ends in the second direction, but the present invention is not limited thereto. In this modified example, the triangular space of the convex space S is provided only at the lower end. In other words, the upper end of the convex space S is provided with a circular ring-shaped space.

[0146] (4-3) Modification 3

[0147] In the above-described embodiment, the triangular portion 34d has a V-shape when viewed from the first direction, but the present invention is not limited thereto. The triangular portion 34d of the present modification example has a U-shape.

[0148] (4-4) Modification 4

[0149] In the above-described embodiment, the drainage rib 130 has a V-shape when viewed from the bottom, but the present invention is not limited thereto. The drainage rib 130 of the present modification has a U-shape when viewed from the bottom.

[0150] (4-5) Modification 5

[0151] In the above-described embodiment, water is discharged from the drainage rib 130 via the space between the portion having the second dimension L2 of the first fin 131 and the fourth portion of the second fin 132 , but the mechanism of drainage is not limited.

[0152] (4-6) Modification 6

[0153] In the above-described embodiment, the collar portion 32 includes the first portion 33 , the second portion 34 , the third portion 35 , and the fourth portion 36 , but the fourth portion 36 may be omitted.

[0154] (4-7) Modification 7

[0155] In the above embodiment, the fin 30 is provided with the notch 31a for promoting heat transfer, but the shape, number, and arrangement of the notch 31a are not limited. The notch 31a may extend in a direction intersecting the second direction. Furthermore, the notch 31a may protrude rearward.

[0156] (4-8) Modification 8

[0157] In the above-mentioned embodiment, the heat exchanger 10 is applied to the indoor heat exchanger 231 , but the present invention is not limited thereto. In this modification, the heat exchanger 10 is applied to the outdoor heat exchanger 223 .

[0158] (4-9) Modification 9

[0159] In the above-mentioned embodiment, the heat exchanger 10 is applied to the air conditioner 200, but the present invention is not limited thereto. The heat exchanger 10 may also be applied to a refrigeration device such as a hot water supply device, a floor heating device, or a refrigeration device.

[0160] As mentioned above, although embodiment of this disclosure is described, it should be understood that various changes in form and detail are possible without departing from the spirit and scope of this disclosure described in the claims.

[0161] Description of symbols

[0162] 10: Heat exchanger

[0163] 20: Heat transfer tube

[0164] 30, 131, 132: fins

[0165] 31: Main body

[0166] 32: Ring

[0167] 33: Part 1

[0168] 34: Part 2

[0169] 34a: Inner circumference

[0170] 34b: Outer surface

[0171] 34c: Ring

[0172] 34d: Triangle

[0173] 35: Part 3

[0174] 36: Part 4

[0175] 130: Ribs for drainage

[0176] 200: Air conditioning unit

[0177] 230: Indoor unit

[0178] Prior art literature

[0179] Patent Literature

[0180] Patent Document 1: Japanese Patent Application Publication No. 2015-123458

Claims

1. A heat exchanger (10), comprising: a heat transfer tube (20) extending in a first direction; as well as a plurality of fins (30, 131, 132) stacked in the first direction, The plurality of fins include: a main body portion (31) extending in a second direction intersecting the first direction; and a collar portion (32) for the heat transfer tube to pass through, The collar portion has: a first portion (33) extending from the main body in the first direction; a second portion (34) extending from the first portion toward the heat transfer tube; and a third portion (35) extending from the second portion along the heat transfer tube in the first direction, The second portion of the first fin (131) contacts the end portion of the collar portion of the adjacent second fin (131), When viewed from the first direction, the second portion includes a portion where the distance between the inner peripheral surface (34a) and the outer peripheral surface (34b) is a first dimension (L1), and a portion where the distance between the inner peripheral surface and the outer peripheral surface is a second dimension (L2) larger than the first dimension.

2. The heat exchanger according to claim 1, wherein: The collar portion further comprises a fourth portion (36) extending from the third portion toward the outer peripheral side. The second portion of the first fin contacts the fourth portion of the adjacent second fin.

3. The heat exchanger according to claim 1 or 2, wherein: The second dimension is the portion extending along the second direction.

4. The heat exchanger according to any one of claims 1 to 3, wherein: When viewed from the first direction, the second portion includes a circular ring portion (34c) and a triangular triangular portion (34d) connected to a portion of the circular ring portion. The triangular portion constitutes a portion having the second size.

5. The heat exchanger according to claim 4, wherein: The triangular portion is disposed at a lower end portion of the second portion.

6. The heat exchanger according to any one of claims 1 to 5, wherein: The fin is provided with a drainage rib (130), The drainage rib extends from a convex space (S) formed by the first and second portions of the first fin and a distal end of the collar portion of the second fin.

7. The heat exchanger according to claim 6, wherein: The drainage rib is connected to the portion having the second size.

8. The heat exchanger according to claim 6 or 7, wherein: The drainage rib is provided on the main body. The drainage rib protrudes in the first direction to the second portion.

9. The heat exchanger according to any one of claims 6 to 8, wherein: The fin includes a plurality of collar portions, The drainage rib extends from the first collar portion to the lower collar portion in the second direction.

10. The heat exchanger according to any one of claims 1 to 9, wherein: The heat exchanger is included in an indoor unit (230) of an air conditioning device (200).

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