Heat exchanger

Abstract

A heat exchanger includes a plurality of flat tubes through which a refrigerant flows and a plurality of fins that include a plurality of inserted parts inserted into intervals between the flat tubes and a communication connection part connecting the plurality of inserted parts and that are arrayed at an interval in a fin layering direction intersecting an air blowing direction and an up-down direction. The fins each include a fin body and a drainage part that is provided at a position offset to one side of the inserted part in the air blowing direction and is formed of an inclined part that forms an opening by extending in the fin layering direction and a pair of connection pieces that connect both end edges of the inclined part in the up-down direction with the fin body.

Description

Technical Field

[0001] The present disclosure relates to a heat exchanger.

[0002] This application claims priority from Japanese Patent Application No. 2023-126366 filed in Japan on August 2, 2023, the contents of which are incorporated herein by reference.Background Art

[0003] As an example of a heat exchanger used in an air conditioner, a heat exchanger including a comb tooth-like fin has been known. This type of heat exchanger mainly includes a plurality of flat tubes through which a refrigerant circulates and comb tooth-like fins that are inserted between those flat tubes. The flat tubes are arrayed at an interval in an up-down direction, and the fins are provided to increase the heat transfer coefficient between the refrigerant and the air by vertically connecting those flat tubes.

[0004] When a low-temperature refrigerant flows inside the flat tubes, moisture in the air condenses on the surfaces of the flat tubes, and stays there as condensed water. In order to discharge the condensed water, the apparatus disclosed in Patent Document 1 described below is provided with a plurality of louvers extending in the up-down direction in the fins. Water droplets that have reached the upper ends of the louvers from the lower surfaces of the flat tubes are drawn into the louvers by surface tension and guided downward. It is considered that this enables discharge of water droplets.Citation ListPatent Document

[0005] Patent Document 1: JP 6710205 BSummary of InventionTechnical Problem

[0006] However, when the above-mentioned louvers are provided, there arises a problem in that the pressure loss of the air flow in a flow path between the fins is increased. Further, it is difficult to maintain a constant louver raising angle, and the angle easily changes due to external force or aging, resulting in a further increase in pressure loss.

[0007] The present disclosure has been made in order to solve the problems described above, and an object of the present disclosure is to provide a heat exchanger with reduced pressure loss and high drainage performance.Solution to Problem

[0008] To solve the above-mentioned problem, a heat exchanger according to an embodiment of the present disclosure includes: a plurality of flat tubes that each have a flat plate shape extending in an air blowing direction and are arrayed at an interval in an up-down direction intersecting the air blowing direction, through which a refrigerant flows; and a plurality of fins that include a plurality of inserted parts extending in the up-down direction and inserted into intervals between the flat tubes and a communication connection part connecting the plurality of inserted parts in the up-down direction and are arrayed at an interval in a fin layering direction intersecting the air blowing direction and the up-down direction. The fins each include a fin body and a drainage part that is provided at a position offset to one side of the inserted part in the air blowing direction and is formed of an inclined part that forms an opening by extending in the fin layering direction as approaching from one of one side and the other side in the air blowing direction to the other of the one side and the other side and a pair of connection pieces connecting both end edges of the inclined part in the up-down direction with the fin body.

[0009] A heat exchanger according to an embodiment of the present disclosure includes: a plurality of flat tubes that each have a flat plate shape extending in an air blowing direction and are arrayed at an interval in an up-down direction intersecting the air blowing direction, through which a refrigerant flows; and a plurality of fins that include a plurality of inserted parts extending in the up-down direction and inserted into intervals between the flat tubes and a communication connection part connecting the plurality of inserted parts in the up-down direction and are arrayed at an interval in a fin layering direction intersecting the air blowing direction and the up-down direction. The fins each include a fin body and a drainage part that is provided at a position offset to one side of the inserted part in the air blowing direction and is formed of a second inclined part forming an opening by including a first portion extending in the fin layering direction as approaching from one side to the other side in the air blowing direction and a second portion extending to a side opposite to the first portion in the fin layering direction as approaching from the other side to the one side in the air blowing direction.Advantageous Effects of Invention

[0010] The present disclosure provides a heat exchanger with reduced pressure loss and high drainage performance.Brief Description of Drawings

[0011] FIG. 1 is a cross-sectional view illustrating a configuration of a heat exchanger according to a first embodiment of the present disclosure. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. FIG. 3 is a cross-sectional view of the main portion illustrating a first modified example of the heat exchanger according to the first embodiment of the present disclosure. FIG. 4 is a cross-sectional view of the main portion illustrating a second modified example of the heat exchanger according to the first embodiment of the present disclosure. FIG. 5 is a cross-sectional view illustrating a configuration of a heat exchanger according to a second embodiment of the present disclosure. FIG. 6 is a cross-sectional view illustrating a configuration of a heat exchanger according to a third embodiment of the present disclosure. FIG. 7 is a cross-sectional view of the main portion illustrating a configuration of a heat exchanger according to a fourth embodiment of the present disclosure. FIG. 8 is a cross-sectional view illustrating a configuration of a heat exchanger according to a fifth embodiment of the present disclosure. FIG. 9 is a cross-sectional view illustrating a configuration of a heat exchanger according to a sixth embodiment of the present disclosure. Description of EmbodimentsFirst Embodiment

[0012] With reference to FIG. 1 and FIG. 2, a heat exchanger 1 according to a first embodiment of the present disclosure is described below. The heat exchanger 1 is a device that performs heat exchange between a refrigerant and air by being installed in an air conditioner, for example.

[0013] As illustrated in FIG. 1, the heat exchanger 1 includes a plurality of flat tubes 10 and a fin 20. The flat tube 10 has a flat thin-plate like shape in a cross-sectional view, and a flow path 11 through which a refrigerant flows is formed inside. In the following description, a direction in which the flat tube 10 extends in FIG. 1 (the longitudinal direction in the drawing: the width direction of the flat tube 10) is referred to as an "air blowing direction". A plurality of flat tubes 10 are arrayed at an interval in an up-down direction being a direction intersecting (orthogonal to) the air blowing direction. Air blown from a fan (not illustrated) flows through between a pair of the flat tubes 10 adjacent to each other. The flat tube 10 is integrally formed of, for example, aluminum.

[0014] A plurality of fins 20 each have a plate-like shape extending in the up-down direction and are arrayed at an interval in a layering direction of the fins 20, which is a direction intersecting (orthogonal to) the air blowing direction and the up-down direction described above. The fin 20 includes a fin body 21 and a drainage part 22.

[0015] The fin body 21 includes a plurality of inserted parts 31 that are inserted between the plurality of flat tubes 10 and a communication connection part 32 that is formed integrally with the inserted parts 31 and connects end edges of the plurality of inserted parts 31 in the air blowing direction in the up-down direction. The inserted part 31 is sandwiched between the flat tubes 10 from both sides in the up-down direction. Meanwhile, the communication connection part 32 extends at a position offset in the air blowing direction with respect to the flat tube 10. In other words, there is no member that blocks in the up-down direction on the communication connection part 32.

[0016] The fin body 21 is inserted into an interval between the flat tubes 10 from one side in the air blowing direction. In other words, the heat exchanger 1 is a type of including the fin 20 having a so-called comb tooth-like shape.

[0017] The drainage part 22 is provided at a position offset to one side in the air blowing direction in the inserted part 31 of the fin body 21 (in other words, the communication connection part 32 side). The drainage part 22 is provided to discharge condensed water (a water droplet) generated on the surface of the flat tube 10 to the outside. The drainage part 22 extends in the up-down direction. The upper end portion of the drainage part 22 is positioned slightly below the lower surface of the flat tube 10 on the upper side. The lower end portion of the drainage part 22 is positioned slightly above the upper surface of the flat tube 10 on the lower side.

[0018] As illustrated in FIG. 2, the drainage part 22 includes an inclined part 41 and a pair of connection pieces 42. The inclined part 41 is formed by raising a slit, which is formed in the fin body 21 in the up-down direction, in the above-mentioned layering direction of the fins 20. Specifically, the inclined part 41 is inclined to extend in the layering direction of the fins 20 as approaching from one side to the other side in the air blowing direction. The connection pieces 42 each having a triangular shape are provided between the end edges of the inclined part 41 in the up-down direction and the fin body 21.

[0019] The inclined part 41 and the connection piece 42 are integrated with each other, and the connection piece 42 is formed simultaneously by plastically deforming the member when the inclined part 41 is formed from the slit as described above. Between the other end edge of the inclined part 41 in the air blowing direction and the fin body 21 facing the other end edge, an opening 43 having a rectangular shape extending in the layering direction and in the up-down direction of the fins 20 and is formed. The dimension of the opening 43 in the layering direction of the fins 20 is preferably a few millimeters. Further, the maximum protrusion height of the inclined part 41 is preferably one-half of an interval (separation distance) between the fins 20 adjacent to each other.Operational Effects

[0020] In order to operate the heat exchanger 1, first, a refrigerant is caused to flow through the flow path 11 inside the flat tube 10. Subsequently, air is forcibly fed into an interval between the flat tubes 10 by a fan. For example, when a low-temperature refrigerant flows, heat of the air is transferred to the low-temperature refrigerant, and the temperature of the air is reduced. The cooled air is used, for example, as cold air of an air-conditioning apparatus.

[0021] On the other hand, when a low-temperature refrigerant flows inside the flat tube 10, condensed water (a water droplet) is generated on the surface of the flat tube 10 due to heat exchange with air containing moisture. When the water droplets are increased in size, the flow path cross-sectional area of the air flow path is reduced, and a fan driving force is increased more than expected, resulting in a decrease in overall efficiency of the apparatus. Thus, the present embodiment adopts a configuration in which water droplets are discharged by the drainage part 22 described above.

[0022] As illustrated in FIG. 1, a water droplet growing on the lower surface of the flat tube 10 drips downward due to gravity, and enters the opening 43 of the drainage part 22. Inside the opening 43, residual water droplets are gradually captured by surface tension. The water droplets captured in the drainage part 22 flow downward along the drainage part 22. The water droplets are finally discharged to the outside through a space on the communication connection part 32 side.

[0023] As described above, in the above-mentioned configuration, the fin 20 is provided with the drainage part 22, and hence the water droplets remaining on the lower surface of the flat tube 10 can be captured by the opening 43 of the drainage part 22 and guided downward. Further, the drainage part 22 is formed by the inclined part 41 and the pair of connection pieces 42, and hence the inclination angle of the inclined part 41 can be stably maintained by the support of the connection pieces 42. In other words, even when an external force is applied, deformation or the like of the inclined part 41 can be prevented. This can prevent an unnecessary increase in pressure loss and a decrease in drainage performance caused by narrowing of the opening 43. Further, the inclined part 41 extends only to one side or the other side in the air blowing direction, and hence an increase in pressure loss with respect to the air flow can be avoided. Therefore, a driving force of an air blowing fan can be reduced as compared to the related art. This can improve the overall efficiency of the apparatus.

[0024] In the above-mentioned configuration, the maximum protrusion height of the inclined part 41 is one-half of an interval between the fins 20. Thus, by arranging the end portions of the fins 20 are arranged at an equal interval in the layering direction of the fins 20, an effect of drawing the water droplets remaining on the lower surface of the flat tube 10 into the drainage part 22 can be maximized. In other words, not only in the opening 43 but also between the inclined part 41 and the adjacent fin 20, an effect of drawing in water droplets can be obtained. Further, the possibility that the inclined part 41 interferes with another adjacent fin 20 by coming into contact therewith or the like can be reduced. Therefore, an interval between the fins 20 can be made narrower than the related art, and hence improvement in heat exchange efficiency by the fins 20 can also be achieved.

[0025] The first embodiment of the present disclosure is described above. Note that various changes and modifications can be made to the above-described configurations without departing from the gist of the present disclosure.

[0026] For example, as illustrated as a first modification example in FIG. 3, the direction in which the inclined part 41 extends may be opposite to that in the first embodiment described above. Specifically, in the example of the drawing, the inclined part 41 is inclined to extend in the layering direction of the fins 20 as approaching from the other side to the one side in the air blowing direction. The opening 43 faces one side in the air blowing direction. With this configuration, the operational effects similar to those described above can be obtained.

[0027] A configuration illustrated in FIG. 4 may also be adopted as a second modification example. In this example, the drainage part 22 is formed by the second inclined part 140 including a first portion 141 and a second portion 142. The first portion 141 is inclined to extend in the layering direction of the fins 20 as approaching from the one side to the other side in the air blowing direction. The second portion 142 is inclined at a position facing the first portion 141 so as to extend in to a side opposite to the first portion 141 in the layering direction of the fins 20 as approaching from the other side to the one side in the air blowing direction. In this case, the opening 43 is oriented to the one side in the air blowing direction. Further, both ends of the first portion 141 in the up-down direction and both ends of the second portion 142 in the up-down direction are opened, and the connection piece 42 described above is not provided. According to this configuration, the drainage part 22 includes the first portion 141 and the second portion 142 that extend in the directions opposite to each other. This can reduce the overall protrusion height of the drainage part 22 in the layering direction of the fins 20. As a result, a pressure loss of air between the fins 20 can be reduced, and hence a driving force of the fan can be reduced as compared to the related art. Further, the connection piece 42 is not provided, and hence water droplets can be captured efficiently from the upper end of the drainage part 22 facing the flat tube 10. This can further improve drainage performance.Second Embodiment

[0028] Next, a second embodiment of the present disclosure is described with reference to FIG. 5. Note that the same components as those of the first embodiment are denoted by the same reference signs, and a detailed description thereof is omitted.

[0029] As illustrated in FIG. 5, in the present embodiment, the position of the drainage part 22 in the up-down direction is different from that in the first embodiment described above. Specifically, the drainage part 22 is arranged at a position offset to the upper side. Therefore, the distance between the flat tube 10 on the lower side and the lower end portion of the drainage part 22 is larger than the distance between the flat tube 10 on the upper side and the upper end portion of the drainage part 22.Operational Effects

[0030] In the above-mentioned configuration, the drainage part 22 is arranged offset to the upper side, and hence water droplets can be captured and collected efficiently from the lower surface of the flat tube 10 where water droplets tend to accumulate. On the other hand, for water droplets staying on an upper surface of another flat tube 10 positioned below the drainage part 22, the downward flow is not hindered. In other words, when water droplets staying on the lower side are captured by the lower end of the drainage part 22, the downward flow is hindered. In the above-mentioned configuration, it is possible to reduce the possibility that such a phenomenon occurs. This enables more efficient discharge of water droplets in the configuration including the plurality of flat tubes 10.

[0031] The second embodiment of the present disclosure is described above. Note that various changes and modifications can be made to the above-described configurations without departing from the gist of the present disclosure. For example, the position of the drainage part 22, which is described as a modified example of the first embodiment described above, can be changed similarly to the second embodiment. With this configuration, the operational effects similar to those described above can be obtained.Third Embodiment

[0032] Next, a third embodiment of the present disclosure is described with reference to FIG. 6. The same components as those in each of the above-described embodiments are denoted by the same reference signs, and a detailed description thereof is omitted.

[0033] As illustrated in FIG. 6, in the present embodiment, the direction in which the drainage part 22 extends is different from those in the respective embodiments described above. Specifically, the drainage part 22 is inclined to extend to one side in the air blowing direction, in other words, the communication connection part 32 side as approaching from the upper side to the lower side. Further, the lower end of the drainage part 22 is positioned inside the communication connection part 32 instead of being provided to the inserted part 31 of the fin body 21. Note that the entire lower end of the drainage part 22 is not always necessarily positioned in the communication connection part 32, and at least a part of the lower end of the drainage part 22 is required to be positioned located in the communication connection part 32.

[0034] In the above-mentioned configuration, water droplets on the lower surface of the flat tube 10 that are captured by the drainage part 22 are guided downward along the drainage part 22 and discharged to the communication connection part 32 side. In other words, the possibility that water droplets captured on the upper side stay on an upper surface of another flat tube 10 positioned on the lower side can be reduced. This enables more efficient discharge of water droplets. Finally, water droplets staying on the upper side of the flat tube 10 can be significantly reduced, and hence erosion of a flow path cross-sectional area by the water droplets and an increase in pressure loss can be minimized. This can greatly improve the overall efficiency of the apparatus.

[0035] The third embodiment of the present disclosure is described above. Note that various changes and modifications can be made to the above-described configurations without departing from the gist of the present disclosure. For example, the configurations described above in the first embodiment and the second embodiment are also applicable in combination with the drainage part 22 of the third embodiment. In this case, the operational effects described in the respective embodiments can be obtained in combination.Fourth Embodiment

[0036] Next, a fourth embodiment of the present disclosure is described with reference to FIG. 7. The same components as those in each of the above-described embodiments are denoted by the same reference signs, and a detailed description thereof is omitted.

[0037] As illustrated in FIG. 7, in the fin body 21 according to the present embodiment, an uneven part 50 is formed adjacent to the drainage part 22 on the other side in the air blowing direction. The uneven part 50 includes a plurality of continuous protrusions 51 that project on both sides in the layering direction of the fins 20. The uneven part 50 is to provide increase the surface area of the fin body 21 and improve heat exchange efficiency.

[0038] Further, the inclination direction of the first portion 141 of the second inclined part 140 of the drainage part 22 coincides with the protrusion direction of the protrusion 51 of the uneven part 50 closest to the drainage part 22 side.Operational Effects

[0039] In the above-mentioned configuration, the inclination direction of the first portion 141 of the second inclined part 140 coincides with the protrusion direction of the protrusion 51 of the uneven part 50 closest to the drainage part 22 side. As a result, as indicated with the arrow in FIG. 7, no abrupt change occurs in the flow direction of air flowing into the uneven part 50 via the second inclined part 140, and the air flows smoothly. Thus, the pressure loss with respect to the air flow can be greatly reduced. This can reduce a driving force of the fan as compared to the related art and further improve the overall efficiency of the apparatus.

[0040] The fourth embodiment of the present disclosure is described above. Note that various changes and modifications can be made to the above-described configurations without departing from the gist of the present disclosure. For example, the configurations described above in each embodiment and the modified examples are also applicable in combination with the uneven part 50 described in the fourth embodiment. In this case, the operational effects described in the respective embodiments can be obtained in combination.Fifth Embodiment

[0041] Next, a fifth embodiment of the present disclosure is described with reference to FIG. 8. The same components as those in each of the above-described embodiments are denoted by the same reference signs, and a detailed description thereof is omitted.

[0042] As illustrated in FIG. 8, in the present embodiment, the rigidity reinforcement part 60 for enhancing rigidity is formed in the fin body 21. Specifically, the rigidity reinforcement part 60 is formed of an end edge of each region recessed in the layering direction of the fins 20. An upper end edge 61 close to the flat tube 10 on the upper side extends in the air blowing direction. Further, a side end edge 62 extending downward from the end portion of the upper end edge 61 in the air blowing direction extends in the up-down direction. On the other hand, an end edge close to the flat tube 10 on the lower side is formed of a lower inclined end edge 63 and a lower horizontal end edge 64. The lower inclined end edge 63 extends upward as approaching from the one side to the other side in the air blowing direction. An end portion of the lower inclined end edge 63 on the one side is positioned in the communication connection part 32. The end portion on the other side is positioned in the inserted part 31. The lower horizontal end edge 64 extends in the air blowing direction from the end portion on the other side to the other side in the air blowing direction. Further, at least a part of the lower end portion of the drainage part 22 is provided at a position overlapping with the lower inclined end edge 63 in the air blowing direction (in other words, above the lower inclined end edge 63).Operational Effects

[0043] In the above-mentioned configuration, the water droplets captured by the drainage part 22 are guided by the lower inclined end edge 63 to move downward and are discharged to the communication connection part 32 side. This can reduce the possibility that water droplets captured on the upper side stay on an upper surface of another flat tube 10 positioned on the lower side. Finally, water droplets staying on the upper side of the flat tube 10 can be significantly reduced, and hence erosion of a flow path cross-sectional area by the water droplets and an increase in pressure loss can be minimized. This can greatly improve the overall efficiency of the apparatus.

[0044] The fifth embodiment of the present disclosure is described above. Note that various changes and modifications can be made to the above-described configurations without departing from the gist of the present disclosure. For example, the configurations described above in each embodiment are also applicable in combination with the rigidity reinforcement part 60 described in the fifth embodiment. In this case, the operational effects described in the respective embodiments can be obtained in combination.Sixth Embodiment

[0045] Next, a sixth embodiment of the present disclosure is described with reference to FIG. 9. The same components as those in each of the above-described embodiments are denoted by the same reference signs, and a detailed description thereof is omitted.

[0046] As illustrated in FIG. 9, in the present embodiment, the fin body 21 is provided with a bar ring portion 70. The bar ring portion 70 is provided to maintain a constant interval (separation distance) between the fins 20 adjacent in the layering direction of the fins 20. Specifically, the bar ring portion 70 abuts against another fin body 21 adjacent thereto by protruding in the layering direction of the fins 20. In other words, the interval between the fins 20 can be secured by the protrusion dimension of the bar ring portion 70.

[0047] The drainage part 22 is arranged below the bar ring portion 70. More specifically, the bar ring portion 70 and the drainage part 22 overlap with each other at least in part in the air blowing direction.Operational Effects

[0048] In the above-mentioned configuration, the drainage part 22 is provided below the bar ring portion 70 where water droplets tend to stay, and hence the water droplets in the vicinity of the bar ring portion 70 can be discharged more efficiently. This can improve the overall drainage performance of the heat exchanger 1 and suppress erosion of a flow path cross-sectional area by the staying water droplets and an increase in pressure loss. As a result, the overall efficiency of the apparatus can be further improved.

[0049] The sixth embodiment of the present disclosure is described above. Note that various changes and modifications can be made to the above-described configurations without departing from the gist of the present disclosure. For example, the configurations described above in each embodiment are also applicable in combination with the bar ring portion 70 described in the sixth embodiment. In this case, the operational effects described in the respective embodiments can be obtained in combination.Other Embodiments

[0050] Although embodiments of the present disclosure have been described in detail with reference to the drawings, a specific configuration is not limited to these embodiments, and design changes and the like in a range not departing from the gist of the present disclosure are also included.

[0051] For example, in each of the embodiments described above, the description is made on an example in which only one drainage part 22 is formed in one inserted part 31. However, the number of drainage parts 22 is not limited to the above-mentioned number, and a plurality of drainage parts 22 may be provided at an interval in the air blowing direction. In this case, water droplets can be discharged in a wider range in the air blowing direction.

[0052] The flow of air in the air blowing direction may be from the one side to the other side in the air blowing direction, or from the other side to the one side. In other words, the air flow may be formed from the communication connection portion 32 side to the inserted part 31 side, or may be formed to the opposite side.

[0053] Further, the number of flat tubes 10 illustrated in FIG. 1 and the like is an example, and a larger number of flat tubes 10 can be provided in accordance with design and specifications.

[0054] As for the applications, the heat exchanger 1 may be applied to any thermal machine such as a heat pump, a refrigerator, and other industrial thermal machines, in addition to an air-conditioning apparatus.<Supplementary Notes>

[0055] The heat exchanger 1 described in each of the embodiments is understood as follows, for example.

[0056] (1) A heat exchanger 1 according to a first aspect includes: a plurality of flat tubes 10 that each have a flat plate shape extending in an air blowing direction and are arrayed at an interval in an up-down direction intersecting the air blowing direction, through which a refrigerant flows; and a plurality of fins 20 that include a plurality of inserted parts 31 extending in the up-down direction and inserted into intervals between the flat tubes 10 and a communication connection part 32 connecting the plurality of inserted parts 31 in the up-down direction and are arrayed at an interval in a layering direction of the fins 20 intersecting the air blowing direction and the up-down direction. The fins 20 each include a fin body 21 and a drainage part 22 that is provided at a position offset to one side of the inserted part 31 in the air blowing direction and is formed of an inclined part 41 that forms an opening 43 by extending in the layering direction of the fins 20 as approaching from one of one side and the other side in the air blowing direction to the other of the one side and the other side and a pair of connection pieces 42 connecting both end edges of the inclined part 41 in the up-down direction with the fin body 21. In the above-mentioned configuration, the fin 20 is provided with the drainage part 22, and hence the water droplets remaining on the lower surface of the flat tube 10 can be captured by the opening 43 of the drainage part 22 and guided downward. Further, the drainage part 22 is formed by the inclined part 41 and the pair of connection pieces 42, and hence the inclination angle of the inclined part 41 can be stably maintained. Further, the inclined part 41 extends only to one side or the other side in the air blowing direction, and hence an increase in pressure loss with respect to the air flow can be avoided. Therefore, a driving force of an air blowing fan can be reduced as compared to the related art. (2) The heat exchanger 1 according to a second aspect is the heat exchanger 1 according to (1), wherein a maximum protrusion height of the inclined part 41 in the layering direction of the fins 20 is one-half of an interval between the fins 20 adjacent to each other. In the above-mentioned configuration, the maximum protrusion height of the inclined part 41 is one-half of an interval between the fins 20, and hence the possibility that the inclined part 41 interferes with another adjacent fin 20 by coming into contact therewith or the like can be reduced. (3) The heat exchanger 1 according to a third aspect is the heat exchanger 1 according to (1) or (2), wherein the drainage part 22 is arranged offset to the flat tube 10 on an upper side of a pair of the flat tubes 10 adjacent in the up-down direction. In the above-mentioned configuration, the drainage part 22 is arranged offset to the upper side, and hence water droplets can be captured and collected efficiently from the lower surface of the flat tube 10 where water droplets tend to accumulate. On the other hand, for water droplets staying on an upper surface of another flat tube 10 positioned below the drainage part 22, the downward flow is not hindered. This enables more efficient discharge of water droplets in the configuration including the plurality of flat tubes 10. (4) The heat exchanger 1 according to a fourth aspect is the heat exchanger 1 according to any one of (1) to (3), wherein the drainage part 22 is provided inclined to the communication connection part 32 side as approaching an upper side to a lower side in the up-down direction, and a lower end portion of the drainage part 22 is positioned inside the communication connection part 32. In the above-mentioned configuration, water droplets on the lower surface of the flat tube 10 captured by the drainage part 22 are guided downward along the drainage part 22 and discharged to the communication connection part 32 side. In other words, the possibility that water droplets captured on the upper side stay on an upper surface of another flat tube 10 positioned on the lower side can be reduced. This enables more efficient discharge of water droplets. (5) The heat exchanger 1 according to a fifth aspect is the heat exchanger 1 according to any one of (1) to (4), wherein a rigidity reinforcement part 60 enhancing rigidity of the fin body 21 by being recessed in the layering direction of the fins 20 is formed in the fin body 21, a lower inclined end edge 63, which is at least part of a lower end edge of the rigidity reinforcement part 60, extends downward as approaching from the inserted part 31 side to the communication connection part 32 side, and a lower end portion of the drainage part 22 is positioned on an upper side of the lower inclined end edge 63. In the above-mentioned configuration, the water droplets captured by the drainage part 22 are guided by the lower inclined end edge 63 to move downward and are discharged to the communication connection part 32 side. This can reduce the possibility that water droplets captured on the upper side stay on an upper surface of another flat tube 10 positioned on the lower side. (6) The heat exchanger 1 according to a sixth aspect is the heat exchanger 1 according to any one of (1) to (5), wherein the fins 20 each further include a bar ring portion 70 that is provided integrally with the fin body 21 and defines an interval between the fins 20 by abutting another fin body 21 adjacent thereto, and the drainage part 22 is provided below the bar ring portion 70. In the above-mentioned configuration, the drainage part 22 is provided below the bar ring portion 70 where water droplets tend to stay, and hence the water droplets in the vicinity of the bar ring portion 70 can be discharged more efficiently. (7) The heat exchanger 1 according to a seventh aspect includes: a plurality of flat tubes 10 that each have a flat plate shape extending in an air blowing direction and are arrayed at an interval in an up-down direction intersecting the air blowing direction, through which a refrigerant flows; and a plurality of fins 20 that include a plurality of inserted parts 31 extending in the up-down direction and inserted into intervals between the flat tubes 10 and a communication connection part 32 connecting the plurality of inserted parts 31 in the up-down direction and are arrayed at an interval in a layering direction of the fins 20 intersecting the air blowing direction and the up-down direction, wherein the fins 20 each include a fin body 21 and a drainage part 22 that is provided at a position offset to one side of the inserted part 31 in the air blowing direction and is formed of a second inclined part 140 forming an opening 43 by including a first portion 141 extending in the layering direction of the fins 20 as approaching from one side to the other side in the air blowing direction and a second portion 142 extending to a side opposite to the first portion 141 in the layering direction of the fins 20 as approaching from the other side to the one side in the air blowing direction. In the above-mentioned configuration, the drainage part 22 includes the first portion 141 and the second portion 142 that extend in the directions opposite to each other. This can reduce the overall protrusion height of the drainage part 22 in the layering direction of the fins 20. As a result, a pressure loss of air between the fins 20 can be reduced, and hence a driving force of the fan can be reduced as compared to the related art. (8) The heat exchanger 1 according to an eighth aspect is the heat exchanger 1 according to (7), wherein the drainage part 22 is arranged offset to the flat tube 10 on an upper side of a pair of the flat tubes 10 adjacent in the up-down direction. In the above-mentioned configuration, the drainage part 22 is arranged offset to the upper side, and hence water droplets can be captured and collected efficiently from the lower surface of the flat tube 10 where water droplets tend to accumulate. On the other hand, for water droplets staying on an upper surface of another flat tube 10 positioned below the drainage part 22, the downward flow is not hindered. This enables more efficient discharge of water droplets in the configuration including the plurality of flat tubes 10. (9) The heat exchanger 1 according to a ninth aspect is the heat exchanger 1 according to (7) or (8), wherein the drainage part 22 is provided inclined to the communication connection part 32 side as approaching an upper side to a lower side in the up-down direction, and a lower end portion of the drainage part 22 is positioned inside the communication connection part 32. In the above-mentioned configuration, water droplets on the lower surface of the flat tube 10 captured by the drainage part 22 are guided downward along the drainage part 22 and discharged to the communication connection part 32 side. In other words, the possibility that water droplets captured on the upper side stay on an upper surface of another flat tube 10 positioned on the lower side can be reduced. This enables more efficient discharge of water droplets. (10) The heat exchanger 1 according to a tenth aspect is the heat exchanger 1 according to any one of (7) to (9), wherein a rigidity reinforcement part 60 enhancing rigidity of the fin body 21 by being recessed in the layering direction of the fins 20 is formed in the fin body 21, a lower inclined end edge 63, which is at least part of a lower end edge of the rigidity reinforcement part 60, extends downward as approaching from the inserted part 31 side to the communication connection part 32 side, and a lower end portion of the drainage part 22 is positioned on an upper side of the lower inclined end edge 63. In the above-mentioned configuration, the water droplets captured by the drainage part 22 are guided by the lower inclined end edge 63 to move downward and are discharged to the communication connection part 32 side. This can reduce the possibility that water droplets captured on the upper side stay on an upper surface of another flat tube 10 positioned on the lower side. (11) The heat exchanger 1 according to an eleventh aspect is the heat exchanger 1 according to any one of (7) to (10), wherein the fins 20 each further include a bar ring portion 70 that is provided integrally with the fin body 21 and defines an interval between the fins 20 by abutting another fin body 21 adjacent thereto, and the drainage part 22 is provided below the bar ring portion 70. In the above-mentioned configuration, the drainage part 22 is provided below the bar ring portion 70 where water droplets tend to stay, and hence the water droplets in the vicinity of the bar ring portion 70 can be discharged more efficiently. (12) The heat exchanger 1 according to a twelfth aspect is the heat exchanger 1 according to any one of (7) to (11), further including, on the inserted part 31 side of the drainage part 22 in the air blowing direction, an uneven part 50 protruding to both sides in the layering direction of the fins 20 as viewed in the up-down direction and being continuous in the air blowing direction, and an inclination direction of the first portion 141 of the second inclined part 140 coincides with a protrusion direction of a protrusion 51 of the uneven part 50 closest to the drainage part 22 side.

[0057] In the above-mentioned configuration, the inclination direction of the first portion 141 of the second inclined part 140 coincides with the protrusion direction of the protrusion 51 of the uneven part 50 closest to the drainage part 22 side. This makes gentle the flow direction of air flowing into the uneven part 50 via the second inclined part 140 and can greatly reduce the pressure loss with respect to the air flow.Industrial Applicability

[0058] The present disclosure provides a heat exchanger with reduced pressure loss and high drainage performance.Reference Signs List

[0059] 1 Heat exchanger 10 Flat tube 11 Flow path 20 Fin 21 Fin body 22 Drainage part 31 Inserted part 32 Communication connection part 41 Inclined part 42 Connection piece 43 Opening 50 Uneven part 51 Protrusion 60 Rigidity reinforcement part 61 Upper end edge 62 Side end edge 63 Lower inclined end edge 64 Lower horizontal end edge 70 Bar ring portion 140 Second inclined part 141 First portion 142 Second portion

Claims

1. A heat exchanger, comprising: a plurality of flat tubes that each have a flat plate shape extending in an air blowing direction and are arrayed at an interval in an up-down direction intersecting the air blowing direction, through which a refrigerant flows; and a plurality of fins that comprise a plurality of inserted parts extending in the up-down direction and inserted into intervals between the flat tubes and a communication connection part connecting the plurality of inserted parts to each other in the up-down direction and are arrayed at an interval in a fin layering direction intersecting the air blowing direction and the up-down direction, wherein the fins each comprise a fin body and a drainage part that is provided at a position offset to one side of the inserted part in the air blowing direction and is formed of an inclined part that forms an opening by extending in the fin layering direction as approaching from one of one side and the other side in the air blowing direction to the other of the one side and the other side and a pair of connection pieces connecting both end edges of the inclined part in the up-down direction with the fin body.

2. The heat exchanger according to claim 1, wherein a maximum protrusion height of the inclined part in the fin layering direction is one-half of an interval between the fins adjacent to each other.

3. The heat exchanger according to claim 1 or 2, wherein the drainage part is arranged offset to the flat tube on an upper side of a pair of the flat tubes adjacent in the up-down direction.

4. The heat exchanger according to claim 1 or 2, wherein the drainage part is provided inclined to a side of the communication connection part as approaching an upper side to a lower side in the up-down direction, and a lower end portion of the drainage part is positioned inside the communication connection part.

5. The heat exchanger according to claim 1 or 2, wherein a rigidity reinforcement part enhancing rigidity of the fin body by being recessed in the fin layering direction is formed in the fin body, a lower inclined end edge, which is at least part of a lower end edge of the rigidity reinforcement part, extends downward as approaching from a side of the inserted part to a side of the communication connection part, and a lower end portion of the drainage part is positioned on an upper side of the lower inclined end edge.

6. The heat exchanger according to claim 1 or 2, wherein the fins each further include a bar ring portion that is provided integrally with the fin body and defines an interval between the fins by abutting another fin body adjacent thereto, and the drainage part is provided below the bar ring portion.

7. A heat exchanger, comprising: a plurality of flat tubes that each have a flat plate shape extending in an air blowing direction and are arrayed at an interval in an up-down direction intersecting the air blowing direction, through which a refrigerant flows; and a plurality of fins that include a plurality of inserted parts extending in the up-down direction and inserted into intervals between the flat tubes and a communication connection part connecting the plurality of inserted parts in the up-down direction and are arrayed at an interval in a fin layering direction intersecting the air blowing direction and the up-down direction, wherein the fins each comprise a fin body and a drainage part that is provided at a position offset to one side of the inserted part in the air blowing direction and is formed of a second inclined part forming an opening by comprising a first portion extending in the fin layering direction as approaching from one side to the other side in the air blowing direction and a second portion extending to a side opposite to the first portion in the fin layering direction as approaching from the other side to the one side in the air blowing direction.

8. The heat exchanger according to claim 7, wherein the drainage part is arranged offset to the flat tube on an upper side of a pair of the flat tubes adjacent in the up-down direction.

9. The heat exchanger according to claim 7 or 8, wherein the drainage part is provided inclined to a side of the communication connection part as approaching an upper side to a lower side in the up-down direction, and a lower end portion of the drainage part is positioned inside the communication connection part.

10. The heat exchanger according to claim 7 or 8, wherein a rigidity reinforcement part enhancing rigidity of the fin body by being recessed in the fin layering direction is formed in the fin body, a lower inclined end edge, which is at least part of a lower end edge of the rigidity reinforcement part, extends downward as approaching from a side of the inserted part to a side of the communication connection part, and a lower end portion of the drainage part is positioned on an upper side of the lower inclined end edge.

11. The heat exchanger according to claim 7 or 8, wherein the fins each further include a bar ring portion that is provided integrally with the fin body and defines an interval between the fins by abutting another fin body adjacent thereto, and the drainage part is provided below the bar ring portion.

12. The heat exchanger according to claim 7 or 8, further comprising, on a side of the inserted part of the drainage part in the air blowing direction, an uneven part protruding to both sides in the fin layering direction as viewed in the up-down direction and being continuous in the air blowing direction, and an inclination direction of the first portion of the second inclined part coincides with a protrusion direction of a protrusion of the uneven part closest to a side of the drainage part.

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