Heat exchanger

Abstract

To provide a heat exchanger which is reduced in pressure loss while securing high drain performance.SOLUTION: A heat exchanger comprises: a plurality of flat tubes formed into flat shapes expanding in a blowing direction, arrayed at intervals in a vertical direction intersecting with the blowing direction, and allowing the circulation of refrigerants therein; a plurality of insertion parts inserted into the intervals of the flat tubes; and a plurality of fins having communication connection parts for connecting the plurality of insertion parts, and arrayed at intervals in a fin lamination direction intersecting with the blowing direction and the vertical direction. Each of the fins has: a fin main body; an inclination part provided at a position deviated to one side of the insertion part in the blowing direction, and forming an opening by extending in the fin lamination direction as progressing toward either of the other side and one side from either of one side and the other side in the blowing direction; and a drain part formed of a pair of connection pieces for connecting both-side end edges of the inclination part in the vertical direction and the fin main body.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] As an example of a heat exchanger used in an air conditioner, one having comb-tooth fins is known. This type of heat exchanger mainly includes a plurality of flat tubes through which a refrigerant flows, and comb-tooth fins inserted between the flat tubes. The flat tubes are arranged at intervals in the vertical direction, and the fins are provided to connect the flat tubes vertically to increase the heat transfer coefficient between the refrigerant and air.

[0003] When a low-temperature refrigerant flows inside the flat tubes, moisture in the air condenses and accumulates on the surfaces of the flat tubes. In order to drain this condensed water, the device disclosed in the following Patent Document 1 is provided with a plurality of louvers extending in the vertical direction on the fins. Water droplets that reach 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. This is believed to enable the water droplets to be drained. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6710205 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the louvers are provided, the pressure loss of the air flow in the flow passage between the fins increases, and it is difficult to keep the angle of the louvers constant, so that the angle can easily change due to external forces or aging, further increasing the pressure loss.

[0006] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a heat exchanger in which pressure loss is reduced while ensuring high drainage performance. [Means for solving the problem]

[0007] In order to solve the above problems, the heat exchanger of the present disclosure comprises a plurality of flat tubes having a flat plate shape extending in the air blowing direction, arranged at intervals in a vertical direction intersecting the air blowing direction, and through which a refrigerant flows, and a plurality of fins having a plurality of insertion portions extending in the vertical direction and inserted into the spaces between the flat tubes, and a communicating connection portion connecting the plurality of insertion portions in the vertical direction, and arranged at intervals in the air blowing direction and a fin stacking direction intersecting the vertical direction, wherein the fins have a fin body, and an inclined portion that is provided at a position biased to one side of the air blowing direction in the insertion portion and extends in the fin stacking direction from one side or the other of the air blowing direction to one side or the other of the air blowing direction to form an opening, and a drainage portion formed by a pair of connection pieces that connect both end edges in the vertical direction of the inclined portion to the fin body.

[0008] The heat exchanger of the present disclosure comprises a plurality of flat tubes having a flat plate shape extending in the air blowing direction, arranged at intervals in an up-down direction intersecting the air blowing direction, and through which a refrigerant flows, and a plurality of fins having a plurality of insertion portions extending in the up-down direction and inserted into the spaces between the flat tubes, and a communicating connection portion connecting the plurality of insertion portions in the up-down direction, and arranged at intervals in the air blowing direction and a fin stacking direction intersecting the up-down direction, wherein the fins have a fin body and a drainage portion formed by a second inclined portion that is provided at a position biased to one side of the air blowing direction in the insertion portions, and has a first portion that extends in the fin stacking direction as it moves from one side to the other side of the air blowing direction, and a second portion that extends to the opposite side from the first portion in the fin stacking direction as it moves from the other side to the one side of the air blowing direction. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a heat exchanger in which high drainage performance is ensured and pressure loss is reduced. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a cross-sectional view showing the configuration of a heat exchanger according to the first embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] 4 is a cross-sectional view of a main portion showing a first modified example of the heat exchanger according to the first embodiment of the present disclosure. FIG. [Figure 4] 4 is a cross-sectional view of a main portion showing a second modified example of the heat exchanger according to the first embodiment of the present disclosure. FIG. [Diagram 5] FIG. 4 is a cross-sectional view showing a configuration of a heat exchanger according to a second embodiment of the present disclosure. [Figure 6] FIG. 11 is a cross-sectional view showing a configuration of a heat exchanger according to a third embodiment of the present disclosure. [Figure 7] FIG. 11 is a cross-sectional view of a main portion showing the configuration of a heat exchanger according to a fourth embodiment of the present disclosure. [Figure 8] FIG. 13 is a cross-sectional view showing the configuration of a heat exchanger according to a fifth embodiment of the present disclosure. [Figure 9] FIG. 11 is a cross-sectional view showing the configuration of a heat exchanger according to a sixth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] First Embodiment Hereinafter, a heat exchanger 1 according to a first embodiment of the present disclosure will be described with reference to Figures 1 and 2. The heat exchanger 1 is a device for exchanging heat between a refrigerant and air by being installed, for example, alongside an air conditioning device.

[0012] As shown in FIG. 1, the heat exchanger 1 includes a plurality of flat tubes 10 and fins 20. The flat tubes 10 are flat and thin in cross section, and have flow paths 11 formed therein through which a refrigerant flows. In the following description, the direction in which the flat tubes 10 extend in FIG. 1 (the longitudinal direction in the figure: the width direction of the flat tubes 10) is referred to as the "air blowing direction." A plurality of flat tubes 10 are arranged at intervals in the up-down direction, which is a direction intersecting (orthogonal to) the air blowing direction. Air sent from a fan (not shown) flows between a pair of adjacent flat tubes 10. The flat tubes 10 are integrally formed of, for example, aluminum.

[0013] The fins 20 are shaped like plates extending in the vertical direction, and are arranged at intervals in a stacking direction of the fins 20, which is a direction intersecting (orthogonal to) the above-mentioned air blowing direction and the vertical direction. The fins 20 have a fin body 21 and a drainage portion 22.

[0014] The fin body 21 has a plurality of insertion portions 31 inserted into the spaces between the flat tubes 10, and communicating connections 32 formed integrally with the insertion portions 31 and connecting the ends of the insertion portions 31 in the air blowing direction in the up-down direction. The insertion portions 31 are sandwiched between the flat tubes 10 on both sides in the up-down direction. Meanwhile, the communicating connections 32 extend to a position biased in the air blowing direction relative to the flat tubes 10. In other words, there is no member above the communicating connections 32 that blocks the air blowing direction in the up-down direction.

[0015] The fin body 21 is inserted into the gaps between the flat tubes 10 from one side in the air blowing direction. That is, this heat exchanger 1 is of a type that includes so-called comb-tooth fins 20.

[0016] The drainage section 22 is provided at a position biased toward one side of the air blowing direction in the insertion section 31 of the fin body 21 (i.e., the side of the communicating connection section 32). The drainage section 22 is provided to discharge condensation (water droplets) formed on the surfaces of the flat tubes 10 to the outside. The drainage section 22 extends in the vertical direction. The upper end of the drainage section 22 is located slightly below the lower surface of the upper flat tube 10. The lower end of the drainage section 22 is located slightly above the upper surface of the lower flat tube 10.

[0017] 2, the drainage section 22 has an inclined portion 41 and a pair of connecting pieces 42. The inclined portion 41 is formed by raising a notch formed in the fin body 21 in the vertical direction in the stacking direction of the fins 20. Specifically, the inclined portion 41 is inclined so as to extend in the stacking direction of the fins 20 from one side to the other side in the air blowing direction. Between the vertical edge of the inclined portion 41 and the fin body 21, respectively, a triangular connecting piece 42 is provided.

[0018] The inclined portion 41 and the connecting piece 42 are integral, and the connecting piece 42 is formed at the same time as the inclined portion 41 is formed from the slit by plastically deforming the member as described above. A rectangular opening 43 that expands in the stacking direction of the fins 20 and in the up-down direction is formed between the edge of the inclined portion 41 on the other side of the airflow direction and the opposing fin body 21. The dimension of this opening 43 in the stacking direction of the fins 20 is desirably about several millimeters. Also, the maximum protruding height of the inclined portion 41 is desirably 1 / 2 the interval (separation distance) between adjacent fins 20.

[0019] (Action and effect) To operate the heat exchanger 1, first, a refrigerant is circulated through the flow paths 11 inside the flat tubes 10. Next, air is compressed and sent by a fan to the spaces between the flat tubes 10. For example, when a low-temperature refrigerant is circulating, the heat of the air is transferred to the low-temperature refrigerant, lowering the temperature of the air. This low-temperature air is used, for example, as cool air for an air conditioner.

[0020] On the other hand, when the low-temperature refrigerant flows inside the flat tubes 10, heat exchange with the humid air causes condensation (water droplets) to form on the surfaces of the flat tubes 10. When these water droplets become large, they put pressure on the cross-sectional area of ​​the air flow path, causing the fan driving force to become larger than expected and reducing the efficiency of the entire device. Therefore, in this embodiment, a configuration is adopted in which the above-mentioned drainage section 22 is used to drain the water droplets.

[0021] As shown in Fig. 1, the water droplets that grow on the lower surface of the flat tube 10 drip downward due to gravity and enter the opening 43 of the drainage section 22. Inside the opening 43, the remaining water droplets are gradually captured by surface tension. The water droplets captured in the drainage section 22 flow downward along the drainage section 22. Finally, the water droplets pass through the space on the communicating connection section 32 side and are discharged to the outside.

[0022] As described above, according to the above configuration, since the drainage section 22 is provided on the fin 20, the water droplets remaining on the lower surface of the flat tube 10 can be captured by the opening 43 of the drainage section 22 and guided downward. Furthermore, since the drainage section 22 is formed by the inclined portion 41 and the pair of connecting pieces 42, the inclination angle of the inclined portion 41 can be stably maintained by the support of the connecting pieces 42. In other words, even if an external force is applied, deformation of the inclined portion 41 can be avoided. This makes it possible to prevent an inadvertent increase in pressure loss and a decrease in drainage performance due to the narrowing of the opening 43. In addition, since the inclined portion 41 extends only toward one side or the other side of the blowing direction, it is possible to avoid an increase in pressure loss with respect to the blowing air. Therefore, it is possible to reduce the driving force of the blowing fan compared to the conventional case. This makes it possible to significantly improve the efficiency of the entire device.

[0023] In addition, according to the above configuration, the maximum protruding height of the inclined portion 41 is half the interval between the fins 20, and the ends of the fins 20 are arranged at equal intervals in the stacking direction of the fins 20, thereby maximizing the effect of drawing water droplets that have accumulated on the lower surface of the flat tube 10 into the drainage portion 22. In other words, the effect of drawing water droplets can be obtained not only in the opening 43 but also between the inclined portion 41 and the adjacent fin 20. Furthermore, the possibility that the inclined portion 41 will come into contact with another adjacent fin 20 and interfere with it can be reduced. Therefore, the interval between the fins 20 can be narrower than before, and the heat exchange efficiency of the fins 20 can be improved.

[0024] The first embodiment of the present disclosure has been described above. Note that various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure.

[0025] For example, as a first modification, as shown in Fig. 3, the direction in which the inclined portion 41 extends may be opposite to that of the first embodiment. Specifically, in the example shown in the figure, the inclined portion 41 is inclined so as to extend in the stacking direction of the fins 20 from the other side to one side in the air blowing direction. The opening 43 faces one side in the air blowing direction. Even with this configuration, the same effects as those described above can be obtained.

[0026] Also, as a second modified example, the configuration shown in FIG. 4 can be adopted. In this example, the drainage section 22 is formed by a second inclined section 140 having a first section 141 and a second section 142. The first section 141 is inclined so as to extend in the fin 20 stacking direction from one side to the other side in the airflow direction. The second section 142 is inclined at a position opposite to the first section 141 so as to extend to the opposite side of the first section 141 in the fin 20 stacking direction from the other side to one side in the airflow direction. In this case, the opening 43 faces one side in the airflow direction. In addition, both ends in the vertical direction of the first section 141 and both ends in the vertical direction of the second section 142 are open, and the above-mentioned connecting piece 42 is not provided. According to this configuration, the drainage section 22 has the first section 141 and the second section 142 that extend in opposite directions. This makes it possible to keep the protruding height of the drainage section 22 as a whole in the fin 20 stacking direction small. As a result, the air pressure loss between the fins 20 is reduced, making it possible to keep the driving force of the fan lower than before. In addition, since the connecting piece 42 is not provided, water droplets can be efficiently captured from the upper end of the drainage portion 22 facing the flat tubes 10. This makes it possible to further improve the drainage performance.

[0027] Second Embodiment Next, a second embodiment of the present disclosure will be described with reference to Fig. 5. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0028] 5, in this embodiment, the position of the drainage section 22 in the up-down direction is different from that in the first embodiment. Specifically, the drainage section 22 is disposed in a position biased toward the upper side. Therefore, the distance between the lower flat tube 10 and the lower end of the drainage section 22 is greater than the distance between the upper flat tube 10 and the upper end of the drainage section 22.

[0029] (Action and effect) According to the above configuration, since the drainage section 22 is arranged biased toward the upper side, water droplets can be efficiently captured and collected from the lower surface of the flat tube 10 where the water droplets tend to accumulate. On the other hand, the drainage section 22 does not prevent the water droplets that have accumulated on the upper surface of the other flat tubes 10 located below the drainage section 22 from flowing downward. In other words, if the water droplets that have accumulated on the lower side are captured by the lower end of the drainage section 22, the downward flow is prevented. According to the above configuration, it is possible to reduce the possibility of such an event occurring. As a result, water droplets can be more efficiently discharged in a configuration including multiple flat tubes 10.

[0030] The second embodiment of the present disclosure has been described above. Various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure. For example, the position of the drainage section 22 described as a modified example of the first embodiment can be changed in the same way as in the second embodiment. With this configuration, it is possible to obtain the same effects as those described above.

[0031] <Third embodiment> Next, a third embodiment of the present disclosure will be described with reference to Fig. 6. Note that the same components as those in the above-described embodiments are given the same reference numerals, and detailed description thereof will be omitted.

[0032] 6, in this embodiment, the direction in which the drainage portion 22 extends is different from that of each of the above-described embodiments. Specifically, the drainage portion 22 is inclined from the top to the bottom so as to extend toward one side in the air blowing direction, that is, toward the communicating connection portion 32. In addition, the lower end of the drainage portion 22 is located within the communicating connection portion 32, not within the insertion portion 31 of the fin body 21. Note that the entire lower end of the drainage portion 22 does not necessarily have to be located within the communicating connection portion 32, and it is sufficient that at least a part of the lower end of the drainage portion 22 is located within the communicating connection portion 32.

[0033] According to the above configuration, the water droplets captured in the drainage section 22 on the lower surface of the flat tube 10 are guided downward along the drainage section 22 extending at an angle, and are discharged to the communicating connection section 32 side. In other words, the possibility that the water droplets captured on the upper side will remain on the upper surface of the other flat tube 10 on the lower side can be reduced. This allows the water droplets to be discharged more efficiently. Ultimately, the water droplets remaining on the upper side of the flat tube 10 can be significantly reduced, so that the erosion of the flow path cross-sectional area and the increase in pressure loss caused by the water droplets can be minimized. This makes it possible to greatly improve the efficiency of the entire device.

[0034] The third embodiment of the present disclosure has been described above. Various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure. For example, the configurations described in the first and second embodiments can be combined and applied to the drainage section 22 of the third embodiment. In this case, the effects and advantages described in each embodiment can be obtained in a composite manner.

[0035] <Fourth embodiment> Next, a fourth embodiment of the present disclosure will be described with reference to Fig. 7. Note that the same components as those in the above-described embodiments are given the same reference numerals, and detailed description thereof will be omitted.

[0036] 7, in the fin body 21 according to this embodiment, an uneven portion 50 is formed on the other side in the air blowing direction adjacent to the drainage portion 22. The uneven portion 50 has a plurality of continuous protruding portions 51 that are convex on both sides in the stacking direction of the fins 20. The uneven portion 50 is provided to increase the surface area of ​​the fin body 21 and improve the heat exchange efficiency.

[0037] Furthermore, the inclination direction of the first portion 141 of the second inclined portion 140 of the drainage portion 22 coincides with the protruding direction of the convex portion 51 of the uneven portion 50 that is closest to the drainage portion 22 .

[0038] (Action and effect) According to the above configuration, the inclination direction of the first portion 141 of the second inclined portion 140 coincides with the protruding direction of the convex portion 51 of the uneven portion 50 that is closest to the drainage portion 22. As a result, as shown by the arrow in Fig. 7, the air flowing into the uneven portion 50 via the second inclined portion 140 does not change suddenly in direction, and the air flows smoothly, so that the pressure loss of the air flow can be significantly reduced. This makes it possible to reduce the driving force of the fan compared to the conventional case, thereby further improving the efficiency of the entire device.

[0039] The fourth embodiment of the present disclosure has been described above. Various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure. For example, it is also possible to combine and apply the uneven portion 50 described in the fourth embodiment to the configurations of the above-mentioned embodiments and modified examples. In this case, the effects and advantages described in each embodiment can be obtained in a composite manner.

[0040] <Fifth embodiment> Next, a fifth embodiment of the present disclosure will be described with reference to Fig. 8. Note that the same components as those in the above embodiments are given the same reference numerals, and detailed description thereof will be omitted.

[0041] As shown in FIG. 8, in this embodiment, the fin body 21 is formed with a rigidity complementing portion 60 for increasing rigidity. Specifically, the rigidity complementing portion 60 is formed by each edge of the region recessed in the stacking direction of the fin 20. The upper edge 61 on the side close to the upper flat tube 10 extends in the air blowing direction. In addition, the side edge 62 extending downward from the end of the upper edge 61 in the air blowing direction extends in the up-down direction. On the other hand, the edge on the side close to the lower flat tube 10 is formed by a lower inclined edge 63 and a lower horizontal edge 64. The lower inclined edge 63 extends upward from one side to the other side in the air blowing direction. One end of the lower inclined edge 63 is located within the communicating connection portion 32. The other end is located within the insertion portion 31. The lower horizontal edge 64 extends in the air blowing direction from the other end toward the other side of the air blowing direction. Furthermore, at least a part of the lower end of the drainage portion 22 is provided at a position overlapping with the lower inclined edge 63 in the air blowing direction (that is, above the lower inclined edge 63).

[0042] (Action and effect) According to the above configuration, the water droplets captured in the drainage section 22 are guided by the lower inclined end edge 63 and discharged downward toward the communicating connection section 32. This reduces the possibility that the water droplets captured on the upper side will accumulate on the upper surfaces of the other flat tubes 10 below. Ultimately, the water droplets that accumulate on the upper side of the flat tubes 10 can be significantly reduced, minimizing the erosion of the flow path cross-sectional area and the increase in pressure loss caused by the water droplets. This makes it possible to significantly improve the efficiency of the entire device.

[0043] The fifth embodiment of the present disclosure has been described above. Various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure. For example, it is also possible to combine and apply the rigidity complementing portion 60 of the fifth embodiment to the configuration described in each of the above embodiments. In this case, the effects and advantages described in each embodiment can be obtained in a composite manner.

[0044] Sixth Embodiment Next, a sixth embodiment of the present disclosure will be described with reference to Fig. 9. Note that the same components as those in the above-described embodiments are given the same reference numerals, and detailed description thereof will be omitted.

[0045] As shown in Fig. 9, in this embodiment, a fin body 21 is provided with a burring portion 70. The burring portion 70 is provided to keep constant the interval (separation distance) between adjacent fins 20 in the stacking direction of the fins 20. Specifically, the burring portion 70 protrudes in the stacking direction of the fins 20 to abut against another adjacent fin body 21. In other words, it is possible to ensure the interval between the fins 20 by the protruding dimension of the burring portion 70.

[0046] The drainage section 22 is disposed below the burring section 70. More specifically, the burring section 70 and the drainage section 22 at least partially overlap with each other in the air blowing direction.

[0047] (Action and effect) According to the above configuration, the drainage section 22 is provided below the burring section 70 where water droplets tend to accumulate, so that water droplets near the burring section 70 can be more efficiently discharged. This improves the drainage performance of the entire heat exchanger 1, preventing erosion of the flow path cross-sectional area and an increase in pressure loss caused by water droplets accumulating, and further improving the efficiency of the entire device.

[0048] The sixth embodiment of the present disclosure has been described above. Various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure. For example, it is also possible to combine and apply the burring unit 70 of the sixth embodiment to the configuration described in each of the above embodiments. In this case, the effects and advantages described in each embodiment can be obtained in a composite manner.

[0049] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included.

[0050] For example, in each of the above embodiments, an example has been described in which only one drainage portion 22 is formed in one insertion portion 31. However, the number of drainage portions 22 is not limited to the above, and multiple drainage portions 22 may be provided at intervals in the air blowing direction. In this case, water droplets can be discharged over a wider range in the air blowing direction.

[0051] The air flow in the air blowing direction may be from one side to the other side in the air blowing direction, or from the other side to one side. In other words, the air flow may be formed from the communicating connection part 32 side toward the insertion part 31 side, or the air flow may be formed toward the opposite side.

[0052] Furthermore, the number of flat tubes 10 illustrated in FIG. 1 etc. is just an example, and more flat tubes 10 can be provided depending on the design and specifications.

[0053] Furthermore, the application of the heat exchanger 1 may be in any industrial thermal machinery, such as a heat pump, a refrigerator, etc., in addition to air conditioners.

[0054] <Additional Notes> The heat exchanger 1 described in each embodiment can be understood, for example, as follows.

[0055] (1) A heat exchanger 1 according to a first aspect includes a plurality of flat tubes 10 each having a flat plate shape extending in the air blowing direction, arranged at intervals in a vertical direction intersecting the air blowing direction, and through which a refrigerant flows, and a plurality of fins 20 each having a plurality of insertion portions 31 extending in the vertical direction and inserted into the spaces between the flat tubes 10, and a communicating connection portion 32 connecting the plurality of insertion portions 31 in the vertical direction, and arranged at intervals in the air blowing direction and in a fin 20 stacking direction intersecting the vertical direction, wherein the fin 20 has a fin main body 21, and an inclined portion 41 that is provided at a position biased to one side of the air blowing direction in the insertion portion 31 and extends in the fin 20 stacking direction from one side or the other side of the air blowing direction to one side or the other side of the air blowing direction to form an opening 43, and a drainage portion 22 formed by a pair of connection pieces 42 that connect both end edges of the inclined portion 41 in the vertical direction to the fin main body 21.

[0056] According to the above configuration, since the drainage section 22 is provided on the fin 20, water droplets remaining on the lower surface of the flat tube 10 can be captured by the opening 43 of the drainage section 22 and guided downward. Furthermore, since the drainage section 22 is formed by the inclined section 41 and a pair of connecting pieces 42, the inclination angle of the inclined section 41 can be stably maintained. Moreover, since the inclined section 41 extends only toward one side or the other side of the air blowing direction, an increase in pressure loss in the air blowing can be avoided. Therefore, it is possible to reduce the driving force of the blower fan compared to the conventional case.

[0057] (2) The heat exchanger 1 according to the second aspect is the heat exchanger 1 of (1), wherein the maximum protruding height of the inclined portion 41 in the stacking direction of the fins 20 is 1 / 2 the distance between adjacent fins 20.

[0058] According to the above configuration, the maximum protruding height of the inclined portion 41 is half the distance between the fins 20, thereby reducing the possibility that the inclined portion 41 will come into contact with and interfere with other adjacent fins 20.

[0059] (3) A heat exchanger 1 according to a third aspect is a heat exchanger 1 according to (1) or (2), in which the drainage section 22 is biased toward the upper flat tube 10 of a pair of flat tubes 10 adjacent to each other in the vertical direction.

[0060] According to the above configuration, the drainage section 22 is biased toward the upper side, so that water droplets can be efficiently captured and collected from the lower surfaces of the flat tubes 10 where the water droplets tend to accumulate. On the other hand, water droplets that have accumulated on the upper surfaces of other flat tubes 10 located below the drainage section 22 are not prevented from flowing downward. This makes it possible to more efficiently discharge water droplets in a configuration including multiple flat tubes 10.

[0061] (4) A heat exchanger 1 in a fourth aspect is a heat exchanger 1 in any one of the aspects (1) to (3), wherein the drainage section 22 is inclined toward the communicating connection section 32 as it moves from the top to the bottom in the vertical direction, and the lower end of the drainage section 22 is located within the communicating connection section 32.

[0062] According to the above configuration, water droplets captured in the drainage portion 22 on the lower surface of the flat tube 10 are guided downward along the drainage portion 22 that extends at an angle, and are discharged toward the communicating connection portion 32. In other words, it is possible to reduce the possibility that water droplets captured on the upper side will remain on the upper surface of another flat tube 10 below. This allows the water droplets to be discharged more efficiently.

[0063] (5) A heat exchanger 1 according to a fifth aspect is a heat exchanger 1 according to any one of the aspects (1) to (4), wherein the fin body 21 is formed with a rigidity complementing portion 60 that is recessed in the stacking direction of the fins 20 to increase the rigidity of the fin body 21, and a lower inclined edge 63, which is at least a part of the lower edge of the rigidity complementing portion 60, extends downward from the insertion portion 31 side toward the communicating connection portion 32 side, and the lower end of the drainage portion 22 is located above the lower inclined edge 63.

[0064] According to the above configuration, the water droplets captured in the drainage portion 22 are guided by the lower inclined edge 63 and discharged downward toward the communicating connection portion 32. This reduces the possibility that the water droplets captured on the upper side will remain on the upper surfaces of the other flat tubes 10 below.

[0065] (6) A heat exchanger 1 according to a sixth aspect is a heat exchanger 1 according to any one of the aspects (1) to (5), wherein the fins 20 are integral with the fin body 21 and further have burring portions 70 that abut against adjacent fin bodies 21 to determine the spacing between the fins 20, and the drainage portions 22 are provided below the burring portions 70.

[0066] According to the above-described configuration, the drainage section 22 is provided below the burring section 70 where water droplets tend to accumulate, so that water droplets near the burring section 70 can be more efficiently discharged.

[0067] (7) A heat exchanger 1 according to a seventh aspect includes a plurality of flat tubes 10 each having a flat plate shape extending in the air blowing direction, arranged at intervals in a vertical direction intersecting the air blowing direction, and through which a refrigerant flows, and a plurality of fins 20 each having a plurality of insertion portions 31 extending in the vertical direction and inserted into the spaces between the flat tubes 10, and a communicating connection portion 32 connecting the plurality of insertion portions 31 in the vertical direction, and arranged at intervals in the air blowing direction and in a fin 20 stacking direction intersecting the vertical direction, wherein the fin 20 has a fin body 21, and a drainage portion 22 formed by a second inclined portion 140 having a first portion 141 provided at a position biased to one side of the air blowing direction in the insertion portion 31 and extending in the fin 20 stacking direction as it moves from one side to the other side of the air blowing direction, and a second portion 142 extending to the opposite side from the first portion 141 in the fin 20 stacking direction as it moves from the other side to one side of the air blowing direction.

[0068] According to the above configuration, the drainage section 22 has a first portion 141 and a second portion 142 that extend in opposite directions. This makes it possible to reduce the protruding height of the drainage section 22 as a whole in the stacking direction of the fins 20. As a result, the air pressure loss between the fins 20 is reduced, making it possible to reduce the driving force of the fan to a lower level than before.

[0069] (8) The heat exchanger 1 according to the eighth aspect is the heat exchanger 1 of (7), in which the drainage section 22 is biased toward the upper flat tube 10 of a pair of flat tubes 10 adjacent to each other in the vertical direction.

[0070] According to the above configuration, the drainage section 22 is biased toward the upper side, so that water droplets can be efficiently captured and collected from the lower surfaces of the flat tubes 10 where the water droplets tend to accumulate. On the other hand, water droplets that have accumulated on the upper surfaces of other flat tubes 10 located below the drainage section 22 are not prevented from flowing downward. This makes it possible to more efficiently discharge water droplets in a configuration including multiple flat tubes 10.

[0071] (9) The heat exchanger 1 in a ninth aspect is the heat exchanger 1 of (7) or (8), wherein the drainage section 22 is inclined toward the communicating connection section 32 as it moves from the top to the bottom in the vertical direction, and the lower end of the drainage section 22 is located within the communicating connection section 32.

[0072] According to the above configuration, water droplets captured in the drainage portion 22 on the lower surface of the flat tube 10 are guided downward along the drainage portion 22 that extends at an angle, and are discharged toward the communicating connection portion 32. In other words, it is possible to reduce the possibility that water droplets captured on the upper side will remain on the upper surface of another flat tube 10 below. This allows the water droplets to be discharged more efficiently.

[0073] (10) A heat exchanger 1 according to a tenth aspect is a heat exchanger 1 according to any one of the aspects (7) to (9), wherein the fin body 21 is formed with a rigidity complementing portion 60 that is recessed in the stacking direction of the fins 20 to increase the rigidity of the fin body 21, and a lower inclined edge 63, which is at least a part of the lower edge of the rigidity complementing portion 60, extends downward from the insertion portion 31 side toward the communicating connection portion 32 side, and the lower end of the drainage portion 22 is located above the lower inclined edge 63.

[0074] According to the above configuration, the water droplets captured in the drainage portion 22 are guided by the lower inclined edge 63 and discharged downward toward the communicating connection portion 32. This reduces the possibility that the water droplets captured on the upper side will remain on the upper surfaces of the other flat tubes 10 below.

[0075] (11) The heat exchanger 1 in the eleventh aspect is a heat exchanger 1 in any one of the aspects (7) to (10), wherein the fins 20 are integral with the fin body 21 and further have burring portions 70 that abut against other adjacent fin bodies 21 to determine the spacing between the fins 20, and the drainage portions 22 are provided below the burring portions 70.

[0076] According to the above-described configuration, the drainage section 22 is provided below the burring section 70 where water droplets tend to accumulate, so that water droplets near the burring section 70 can be more efficiently discharged.

[0077] (12) The heat exchanger 1 in the twelfth aspect is a heat exchanger 1 in any one of the aspects (7) to (11), further comprising an uneven portion 50 on the side of the insertion portion 31 of the drainage portion 22 in the air blowing direction, which protrudes on both sides of the stacking direction of the fins 20 when viewed from the vertical direction and continues in the air blowing direction, and the inclination direction of the first part 141 of the second inclined portion 140 and the protruding direction of the convex portion 51 of the uneven portion 50 closest to the drainage portion 22 coincide with each other.

[0078] According to the above configuration, the inclination direction of the first portion 141 of the second inclined portion 140 coincides with the protruding direction of the convex portion 51 of the uneven portion 50 that is closest to the drainage portion 22. This makes the flow direction of the air flowing into the uneven portion 50 via the second inclined portion 140 gentler, thereby significantly reducing the pressure loss of the air flow. [Explanation of symbols]

[0079] 1...Heat exchanger 10...Flat tube 11...Flow path 20...Fin 21...Fin body 22...Drainage portion 31...Insertion portion 32...Communicating connection portion 41...Inclined portion 42...Connection piece 43...Opening 50...Irregular portion 51...Convex portion 60...Rigidity complement portion 61...Upper edge 62...Side edge 63...Lower inclined edge 64...Lower horizontal edge 70...Burring portion 140...Second inclined portion 141...First portion 142...Second portion

Claims

1. A plurality of flat tubes each having a flat plate shape extending in a blowing direction, arranged at intervals in a vertical direction intersecting the blowing direction, and through which a refrigerant flows; A plurality of fins that extend in the vertical direction and have a plurality of insertion portions that are inserted into the gaps between the flat tubes and a communicating connection portion that connects the plurality of insertion portions in the vertical direction, and are arranged at intervals in the air blowing direction and a fin stacking direction that intersects the vertical direction; Equipped with The fin is A fin body, a drainage portion formed by an inclined portion provided at a position biased toward one side of the airflow direction in the insertion portion and extending in the fin stacking direction from one side of the airflow direction to the other side of the airflow direction, and a pair of connecting pieces connecting both ends of the inclined portion in the up-down direction to the fin body; A heat exchanger having

2. The heat exchanger according to claim 1 , wherein a maximum protruding height of the inclined portion in the fin stacking direction is half a distance between adjacent ones of the fins.

3. The heat exchanger according to claim 1 or 2, wherein the drainage portion is disposed biased toward an upper flat tube of a pair of the flat tubes adjacent in the vertical direction.

4. A heat exchanger as described in claim 1 or 2, wherein the drainage section is inclined toward the communicating connection section as it moves from the top to the bottom in the vertical direction, and the lower end of the drainage section is located within the communicating connection section.

5. A heat exchanger as described in claim 1 or 2, wherein the fin body is formed with a rigidity complementing portion that is recessed in the fin stacking direction to increase the rigidity of the fin body, and a lower inclined edge which is at least a part of the lower edge of the rigidity complementing portion extends downward as it moves from the insertion portion side to the communicating connection portion side, and a lower end of the drainage portion is located above the lower inclined edge.

6. 3. A heat exchanger as described in claim 1 or 2, wherein the fins are integral with the fin body and further have burring portions that abut against adjacent fin bodies to determine the spacing between the fins, and the drainage portion is provided below the burring portions.

7. A plurality of flat tubes each having a flat plate shape extending in a blowing direction, arranged at intervals in a vertical direction intersecting the blowing direction, and through which a refrigerant flows; A plurality of fins that extend in the vertical direction and have a plurality of insertion portions that are inserted into the gaps between the flat tubes and a communicating connection portion that connects the plurality of insertion portions in the vertical direction, and are arranged at intervals in the air blowing direction and a fin stacking direction that intersects the vertical direction; Equipped with The fin is A fin body, a drainage section formed by a second inclined portion that is provided at a position biased to one side of the airflow direction in the insertion section, and has a first portion that extends in the fin stacking direction as it moves from one side to the other side of the airflow direction, and a second portion that extends to the opposite side from the first portion in the fin stacking direction as it moves from the other side to the one side of the airflow direction; A heat exchanger having

8. The heat exchanger according to claim 7 , wherein the drainage portion is disposed biased toward an upper flat tube of a pair of the flat tubes adjacent in the vertical direction.

9. A heat exchanger as described in claim 7 or 8, wherein the drainage section is inclined toward the communicating connection section as it moves from the top to the bottom in the vertical direction, and the lower end of the drainage section is located within the communicating connection section.

10. A heat exchanger as described in claim 7 or 8, wherein the fin body is formed with a rigidity complementing portion that is recessed in the fin stacking direction to increase the rigidity of the fin body, and a lower inclined edge which is at least a part of the lower edge of the rigidity complementing portion extends downward as it moves from the insertion portion side to the communicating connection portion side, and a lower end of the drainage portion is located above the lower inclined edge.

11. The heat exchanger according to claim 7 or 8, wherein the fins are integral with the fin body and further have burring portions which abut against adjacent fin bodies to determine the spacing between the fins, and the drainage portion is provided below the burring portions.

12. A heat exchanger as described in claim 7 or 8, wherein the drainage section has an insertion section side in the air blowing direction, which further has an uneven portion that protrudes on both sides of the fin stacking direction when viewed from the vertical direction and continues in the air blowing direction, and the inclination direction of the portion of the second inclined section and the protruding direction of the convex portion of the uneven portion closest to the drainage section side are consistent.

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