Stacked Heat Exchanger

Abstract

To provide a laminated heat exchanger capable of improving heat exchange efficiency.SOLUTION: A laminated heat exchanger includes a plurality of flow passage forming parts 20, and a fin 10 joined to the flow passage forming part by an adhesive agent G. In the fin, a plurality of distal ends 11 joined to the flow passage forming part and extensions 12 extending to connect the distal ends are alternately arranged, and at least a part of the distal ends is directly brought into contact with the flow passage forming part without the adhesive agent interposed therebetween. The laminated heat exchanger includes the plurality of flow passage forming parts 20, and the fin 10 joined to the flow passage forming part by the adhesive agent G. The flow passage forming part has a joint surface 21 having guide grooves 70, 71, 72 for guiding the adhesive agent to a portion at which the flow passage forming part and the fin are joined. In the fin, the plurality of distal ends 11 joined to the flow passage forming part and the extensions 12 extending to connect the distal ends are alternately arranged, and at least a part of the distal ends is brought into contact with the flow passage forming part via the thin film like adhesive agent.SELECTED DRAWING: Figure 7

Description

[Technical Field]

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

[0002] Conventionally, a fin-and-tube heat exchanger has been known that has a plurality of plate-like fins arranged parallel to one another and refrigerant pipes inserted into insertion holes provided in each fin (see, for example, Patent Document 1). In this fin-and-tube heat exchanger, the refrigerant pipes are inserted into the insertion holes of the fins and joined to the fins with an adhesive. This fin-and-tube heat exchanger exchanges heat between the refrigerant flowing through the refrigerant pipes and the air by flowing a fluid such as air between the plurality of fins.

[0003] Since heat exchangers are required to have as high a heat transfer performance as possible, Patent Document 1 describes a method for joining refrigerant pipes and fins to compensate for the reduced heat transfer performance caused by using an adhesive. Specifically, the method describes a joining method in which a refrigerant pipe with adhesive applied to approximately half of its surface is inserted into an insertion hole and joined, thereby creating a portion where the surface of the refrigerant pipe and the inner surface of the insertion hole of the fin come into direct contact with each other, thereby improving the heat transfer performance of the heat exchanger. The method also describes a joining method in which multiple grooves for applying adhesive are formed on the surface of the refrigerant pipe, and the refrigerant pipe and fin are joined with an adhesive filled in the grooves, thereby directly contacting the surface of the refrigerant pipe other than the grooves with the inner surface of the insertion hole, thereby improving the heat transfer performance of the heat exchanger. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-044841 Summary of the Invention [Problem to be solved by the invention]

[0005] Heat exchangers using fins include, for example, stacked heat exchangers, which are made by alternately stacking flat plates and fins made by bending thin plate members back and forth in a corrugated pattern. In stacked heat exchangers, adjacent plates form a flow path through which a fluid flows, and these plates function as flow path forming portions.

[0006] In a stacked heat exchanger, corrugated fins are provided in the flow passages, and one side and the other side of the fins in the plate thickness direction are joined to the flow passage forming parts. Therefore, in order to ensure the heat exchange efficiency that indicates the heat transfer performance of the stacked heat exchanger, the method of joining the corrugated fins to the flow passage forming parts that form the flow passages through which the fluid flows is important.

[0007] However, Patent Document 1 only describes a method for joining refrigerant tubes and fins that can improve the heat exchange efficiency in a fin-and-tube heat exchanger, and does not describe a method for joining flow path forming portions and fins that can improve the heat exchange efficiency in a stacked heat exchanger.

[0008] An object of the present disclosure is to provide a stacked heat exchanger that can improve heat exchange efficiency. [Means for solving the problem]

[0009] The invention described in claim 1 is A stacked heat exchanger, a plurality of flow path forming portions (20, P) that form flow path portions (AP, RP, WP) through which a fluid flows; fins (10, 60, IF) joined to the flow path forming portion by an adhesive (G); The fin is formed by bending a plate-like member into a wave shape, and a plurality of tip portions (11, 61) joined to the flow path forming portion and extension portions (12, 62) extending so as to connect adjacent tip portions are alternately formed, and at least a part of the tip portions is in direct contact with the flow path forming portion without the use of adhesive. And, the flow path forming portion has a joining surface (21, 22) to which the tip portion is joined, the joining surface extends in a plane and has guide grooves (70, 71, 72, 73, 74, 75) for guiding adhesive to the area where the flow path forming portion and the fin are joined; The guide groove guides the adhesive to the periphery of the portion of the tip portion that directly contacts the flow path forming portion, and includes a first guide groove (71) that extends at an angle with respect to the fin extension direction (DR1s, DR2s), when the direction in which the plurality of tip portions and the plurality of extension portions are alternately arranged is defined as the fin extension direction, and a second guide groove (72) that is at an angle with respect to the fin extension direction and extends intersecting the direction in which the first guide groove extends; The first guide groove and the second guide groove intersect with each other at a portion of the joining surface where the tip portion is disposed.

[0010] In this way, at least a portion of the tip of the fin is in direct contact with the flow path forming portion without the use of adhesive, thereby suppressing the decrease in thermal conductivity between the fin and the flow path forming portion that occurs when joining with adhesive, thereby improving the heat exchange efficiency of the stacked heat exchanger.

[0011] The invention described in claim 3 is as follows: A stacked heat exchanger, a plurality of flow path forming portions (20, P) that form flow path portions (AP, RP, WP) through which a fluid flows; fins (10, 60, IF) joined to the flow path forming portion by an adhesive (G); the flow path forming portion has a joining surface (21, 22) to which the tip portion is joined, the joining portion extends in a plane and has guide grooves (70, 71, 72, 73, 74, 75) for guiding adhesive to a portion where the flow path forming portion and the fin are joined; The fin is formed by bending a plate-like member into a wave-like shape, and a plurality of tip portions (11, 61) joined to the flow path forming portion and extension portions (12, 62) extending so as to connect adjacent tip portions are formed alternately, and at least a part of the tip portions contacts the flow path forming portion via a thin film adhesive, The guide groove guides the adhesive to the periphery of the portion that contacts the flow path forming portion via the thin film adhesive at the tip. and when the direction in which the plurality of tip portions and the plurality of extension portions are alternately arranged is defined as the fin extension direction (DR1s, DR2s), the fin includes a first guide groove (71) extending at an angle to the fin extension direction and a second guide groove (72) extending at an angle to the fin extension direction and intersecting the direction in which the first guide groove extends, The first guide groove and the second guide groove intersect with each other at a portion of the joining surface where the tip portion is disposed.

[0012] According to this, even if adhesive is present on at least a portion of the tip of the fin, as long as the adhesive is in the form of a thin film, there is almost no effect of a decrease in thermal conductivity between the fin and the flow path forming portion that occurs when bonding with the adhesive, and therefore the decrease in thermal conductivity between the fin and the flow path forming portion that occurs when bonding with the adhesive can be suppressed, thereby improving the heat exchange efficiency of the stacked heat exchanger.

[0013] Furthermore, the thin film adhesive between the tip and the flow path forming portion is guided by the guide groove so that the film thickness is approximately constant, thereby suppressing variations in the thermal conductivity between the fin and the flow path forming portion due to variations in the film thickness of the thin film adhesive.

[0014] The reference symbols in parentheses attached to each component indicate an example of the correspondence between the component and the specific components described in the embodiments described below. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view of a heat exchanger according to a first embodiment. [Figure 2] FIG. 2 is an enlarged view of part II in FIG. [Figure 3] 3 is a side view of the tube and the first fin as viewed from the direction of the arrow indicated by III in FIG. 2. FIG. [Figure 4] 4 is a side view of the tube and the first fin as seen from the direction of the arrow indicated by IV in FIG. 2. FIG. [Figure 5] FIG. 2 is an enlarged view of a portion V in FIG. [Figure 6] FIG. 2 is a cross-sectional view of the tube according to the first embodiment. [Figure 7] 5A to 5C are diagrams illustrating a method for joining a first fin and a tube according to the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view of a portion VIII in FIG. 7. [Figure 9] FIG. 8 is a cross-sectional view of a portion IX in FIG. 7. [Figure 10]8 is a side view of the first fin and the tube as seen from the direction of the arrow indicated by X in FIG. 7. FIG. [Figure 11] FIG. 10 is a diagram showing a guide groove according to a first modified example of the first embodiment. [Figure 12] FIG. 10 is a diagram showing a guide groove according to a second modified example of the first embodiment. [Figure 13] FIG. 10 is a diagram showing a guide groove according to a third modified example of the first embodiment. [Figure 14] FIG. 14 is a cross-sectional view of a portion XIV in FIG. 13. [Figure 15] FIG. 10 is a diagram corresponding to FIG. 9 in the second embodiment. [Figure 16] FIG. 10 is a diagram corresponding to FIG. 9 in the third embodiment. [Figure 17] FIG. 10 is a view corresponding to FIG. 9 in the fourth embodiment. [Figure 18] FIG. 10 is a view corresponding to FIG. 9 in the fifth embodiment. [Figure 19] FIG. 12 is a view corresponding to FIG. 10 in the sixth embodiment. [Figure 20] FIG. 10 is a perspective view of a heat exchanger according to another embodiment. [Figure 21] FIG. 21 is a cross-sectional view of a portion XXI of FIG. 20. [Figure 22] FIG. 22 is an enlarged view of part XXII of FIG. 21. [Figure 23] FIG. 10 is a view corresponding to FIG. 8 of another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, parts that are the same as or equivalent to those described in the preceding embodiments will be given the same reference numerals, and their description may be omitted. Furthermore, in the embodiments, when only some of the components are described, the components described in the preceding embodiments can be applied to the remaining components. The following embodiments can be partially combined with each other, even if not specifically stated, as long as there is no particular problem with the combination.

[0017] (First embodiment) This embodiment will be described with reference to Figures 1 to 10. The heat exchanger 1 of this embodiment is used, for example, as an evaporator that constitutes part of a refrigeration cycle that conditions the air inside a vehicle. The evaporator exchanges heat between a refrigerant circulating in the refrigeration cycle and air passing through the heat exchanger 1, and cools the air by the latent heat of evaporation of the refrigerant.

[0018] 1, the heat exchanger 1 includes a plurality of first fins 10, a plurality of tubes 20, a first header tank 31, a second header tank 32, a third header tank 33, a fourth header tank 34, and an outer frame member 40. These members are formed from a material (e.g., a metal such as aluminum) having a higher thermal conductivity than an adhesive G (described below) used to join the tubes 20 and the first fins 10. Note that these members are not limited to aluminum, and may be formed from a metal other than aluminum, or may be formed from a material other than metal, such as a resin having high conductivity.

[0019] The plurality of tubes 20 are stacked and arranged at predetermined intervals in a direction intersecting the air flow direction. That is, the heat exchanger 1 of this embodiment is a stacked heat exchanger in which the plurality of tubes 20 are stacked and arranged, and is a fin-tube heat exchanger. The plurality of tubes 20 are arranged in two rows, one on the upstream side and one on the downstream side of the air flow direction. Each of the plurality of tubes 20 extends linearly from one end to the other end. One end of each of the plurality of tubes 20 is inserted into the first header tank 31 or the second header tank 32, and the other end is inserted into the third header tank 33 or the fourth header tank 34.

[0020] The first header tank 31 and the second header tank 32 distribute the refrigerant to the plurality of tubes 20. The third header tank 33 and the fourth header tank 34 collect the refrigerant flowing in from the plurality of tubes 20. The tubes 20 are not limited to having two rows in the air flow direction, and may have only one row in the air flow direction.

[0021] As shown in FIGS. 2 and 3 , gaps formed between adjacent tubes 20 in the stacking direction among the plurality of tubes 20 form air passages AP as flow paths through which air, which is a fluid, flows. First fins 10 are provided in the air passages AP. Specifically, the first fins 10 are joined to the flat surface of the tubes 20. That is, the first fins 10 of this embodiment are outer fins provided on the outside of the tubes 20. Hereinafter, the surface of the tubes 20 will also be referred to as the outer peripheral surface 21. Guide grooves 70, which will be described later, are formed in the outer peripheral surface 21 of the tubes 20 to guide adhesive G to the area where the tubes 20 and the first fins 10 are joined.

[0022] As shown in FIGS. 4 to 6 , the tube 20 has a cross-sectional shape of a flat tube. The tube 20 is formed by bending a single metal plate into a tubular shape and then overlapping and joining portions of the metal plate. As a result, a refrigerant passage RP is formed inside the tube 20 as a flow path portion through which a refrigerant flows. The tube 20 has a second fin 60 in the refrigerant passage RP. Specifically, the second fin 60 is joined to the flat inner surface of the tube 20. That is, the second fin 60 in this embodiment is an inner fin provided inside the tube 20. Hereinafter, the inner surface of the tube 20 will also be referred to as an inner circumferential surface 22. A groove (not shown) is formed in the inner circumferential surface 22 of the tube 20 to guide adhesive G to the portion where the tube 20 and the second fin 60 are joined. In this embodiment, the tube 20 functions as a flow path forming portion that forms the air passage AP and the refrigerant passage RP, which are flow path portions.

[0023] The first fins 10 increase the heat transfer area between the refrigerant flowing inside the tubes 20 and the air flowing outside the tubes 20, thereby improving the heat exchange efficiency between the refrigerant and the air. The first fins 10 are so-called corrugated fins formed by bending a thin metal plate member made of aluminum or the like into a wave shape. The first fins 10 have a plurality of first tip portions 11 and first extension portions 12. The plurality of first tip portions 11 are portions where the plate member constituting the first fin 10 is bent at predetermined intervals. The first tip portions 11 have an arc-shaped cross section perpendicular to the air flow direction, and are curved so as to bulge toward the tubes 20.

[0024] The first extension portion 12 is a portion of the plurality of first tip portions 11 that is disposed between adjacent first tip portions 11. The first extension portion 12 is formed to extend in a plane so as to connect the adjacent first tip portions 11.

[0025] As shown in Figures 4 and 5, the first extension portion 12 is provided with a plurality of louvers 14 formed by cutting and raising portions of a plate-like member. The first tip portions 11 contact the outer peripheral surfaces 21 of the adjacent tubes 20, and these contacting portions are joined with adhesive G. In other words, the outer peripheral surfaces 21 are the joining surfaces to which the first tip portions 11 are joined. This joining structure fixes the first fins 10 to the tubes 20. The method for joining the first fins 10 and the tubes 20 will be described in detail below.

[0026] In the following description, as shown in FIG. 2 and other figures, the thickness direction of the first fin 10 is referred to as the first fin thickness direction DR1t, and the direction in which the corrugated fin extends is referred to as the first fin extension direction DR1s. The direction perpendicular to the first fin thickness direction DR1t and the first fin extension direction DR1s is referred to as the first fin width direction DR1w. The first fin thickness direction DR1t is the direction in which the waves in the corrugated first fin 10 travel back and forth, and corresponds to the fin thickness direction. The first fin extension direction DR1s is the direction in which the multiple first tip portions 11 and the multiple first extension portions 12 are alternately arranged, and corresponds to the fin extension direction. The first fin width direction DR1w corresponds to the fin width direction.

[0027] The first fins 10 are arranged so that the first fin thickness direction DR1t is the stacking direction of the tubes 20 and the first fin extension direction DR1s is the longitudinal direction of the tubes 20. The first fins 10 are also arranged so that the first fin width direction DR1w is the air flow direction in the air passage AP. In other words, the first fin extension direction DR1s coincides with the direction extending longitudinally on the outer circumferential surface 21 of the tube 20. The first fin width direction DR1w coincides with the width direction of the tube 20.

[0028] The second fin 60 is a so-called corrugated fin formed by bending a thin metal plate member made of aluminum or the like into a wave shape. The second fin 60 has a plurality of second tip portions 61 and a plurality of second extension portions 62. The plurality of second tip portions 61 are portions where the plate member constituting the second fin 60 is bent at predetermined intervals. The second tip portions 61 have an arc-shaped cross section perpendicular to the refrigerant flow direction, and are curved so as to bulge toward the inner circumferential surface 22 of the tube 20.

[0029] The second extending portion 62 is a portion of the plurality of second tip portions 61 that is disposed between adjacent second tip portions 61. The second extending portion 62 is formed to extend in a plane so as to connect the adjacent second tip portions 61.

[0030] The second tip portion 61 of the second fin 60 contacts the inner circumferential surface 22 of the tube 20, and the contact portion is bonded thereto with adhesive G. In other words, the inner circumferential surface 22 is the bonding surface to which the second tip portion 61 is bonded. This bonding structure secures the second fin 60 to the tube 20. The method for bonding the second fin 60 to the tube 20 is the same as the method for bonding the first fin 10 to the tube 20, and therefore details of this bonding method will be described later in the section on the method for bonding the first fin 10 to the tube 20.

[0031] In the following description, as shown in FIG. 6 and other figures, the thickness direction of the second fin 60 is referred to as the second fin thickness direction DR2t, and the direction in which the corrugated fin extends is referred to as the second fin extension direction DR2s. The direction perpendicular to the second fin thickness direction DR2t and the second fin extension direction DR2s is referred to as the second fin width direction DR2w. The second fin thickness direction DR2t is the direction in which the waves in the corrugated second fin 60 travel back and forth, and corresponds to the fin thickness direction. The second fin extension direction DR2s is the direction in which the multiple second tip portions 61 and the multiple second extension portions 62 are alternately arranged, and corresponds to the fin extension direction. The second fin width direction DR2w corresponds to the fin width direction.

[0032] The second fins 60 are arranged so that the second fin thickness direction DR2t is the stacking direction of the tubes 20 and coincides with the first fin thickness direction DR1t. The second fins 60 are arranged so that the second fin extension direction DR2s is the width direction of the tubes 20 and coincides with the first fin width direction DR1w. The second fins 60 are arranged so that the second fin width direction DR2w is the refrigerant flow direction in the refrigerant passage RP and coincides with the first fin extension direction DR1s.

[0033] An outer frame member 40 is provided on the outside in the direction in which the plurality of tubes 20 and the plurality of first fins 10 are alternately arranged. A piping connection member (not shown) is fixed to the outer frame member 40. The refrigerant has a refrigerant inlet through which a refrigerant is supplied and a refrigerant outlet through which the refrigerant is discharged. The refrigerant that flows into the first header tank 31 from the refrigerant inlet of the piping connection member flows through the first header tank 31 to the fourth header tank 34 and the plurality of tubes 20 along a predetermined path, and then flows out from the refrigerant outlet of the piping connection member. At this time, the air flowing through the air passage AP in which the first fins 10 are provided is cooled by the latent heat of evaporation of the refrigerant flowing through the first header tank 31 to the fourth header tank 34 and the plurality of tubes 20.

[0034] Next, a method for joining the first fins 10 and the tubes 20 will be described with reference to FIGS. 7 to 10. As shown in FIG. 7, the first fins 10 are joined by an adhesive G applied to the outer peripheral surface 21 of the tube 20 at a location where the first fin 10 will be disposed. Specifically, the first fin 10 is joined at its first tip end 11 on one side in the first fin thickness direction DR1t to the tube 20 by the adhesive G applied to the outer peripheral surface 21 of the tube 20 disposed on one side of the first fin 10 in the first fin thickness direction DR1t. Furthermore, the first fin 10 is joined at its first tip end 11 on the other side in the first fin thickness direction DR1t to the tube 20 by the adhesive G applied to the outer peripheral surface 21 of the tube 20 disposed on the other side of the first fin 10 in the first fin thickness direction DR1t.

[0035] The method of joining one side of the first fin 10 in the first fin thickness direction DR1t to the tube 20 is the same as the method of joining the other side of the first fin 10 in the first fin thickness direction DR1t to the tube 20. For this reason, in this embodiment, only the details of the method of joining one side of the first fin 10 in the first fin thickness direction DR1t to the tube 20 will be described, and the details of the method of joining the other side of the first fin 10 in the first fin thickness direction DR1t to the tube 20 will be omitted.

[0036] When joining the first fin 10 and the tube 20, adhesive G for joining the first fin 10 is placed in guide grooves 70 formed in the outer peripheral surface 21 of the tube 20. The depth of the guide grooves 70 is, for example, 1 mm. However, the depth of the guide grooves 70 is not limited, and the depth of the guide grooves 70 may be greater than or less than 1 mm.

[0037] Then, the first tip portion 11 of the first fin 10 is placed on the outer peripheral surface 21 of the tube 20 with the adhesive G placed in the guide groove 70, thereby joining the first fin 10 and the tube 20. The adhesive G of this embodiment is made of a resin member having adhesive properties and contains a filler mixed therein to enhance thermal conductivity.

[0038] 7 shows only a part of the first fin 10, and other parts are omitted. In addition, in FIGS. 7 to 10, the adhesive G is hatched with a dot pattern to make it easier to see.

[0039] Here, as shown in Fig. 7, in this embodiment, a plurality of guide grooves 70 are formed on the outer peripheral surface 21 of the tube 20. The guide grooves 70 are formed linearly along the outer peripheral surface 21. The guide grooves 70 extend at an angle in the first fin extension direction DR1s and the first fin width direction DR1w. Specifically, the guide grooves 70 include a first guide groove 71 that extends at an angle in the first fin extension direction DR1s and the first fin width direction DR1w. The guide grooves 70 also include a second guide groove 72 that extends at an angle in the first fin extension direction DR1s and the first fin width direction DR1w and intersects with the direction in which the first guide groove 71 extends.

[0040] A plurality of first guide grooves 71 are formed so as to be aligned along the first fin extension direction DR1s. Each first guide groove 71 has a rectangular cross section perpendicular to the extension direction of the first guide groove 71. Each first guide groove 71 is formed across one or more first fins 10.

[0041] A plurality of second guide grooves 72 are formed and aligned along the first fin width direction DR1w. Each second guide groove 72 has a rectangular cross section perpendicular to the direction in which the second guide groove 72 extends. Each second guide groove 72 is formed across one or more first fins 10.

[0042] The cross-sectional shape of the first guide groove 71 and the second guide groove 72 in a plane perpendicular to the direction in which they extend is not limited to a rectangular shape, but may be, for example, an arc shape or a V shape.

[0043] The first guide groove 71 and the second guide groove 72 are formed over the entire outer circumferential surface 21 of the tube 20 and intersect with each other. That is, the first guide groove 71 and the second guide groove 72 are formed in a lattice pattern. The first fin 10 has the first tip portion 11 joined to the portion where the first guide groove 71 and the second guide groove 72 intersect with each other. In other words, the first guide groove 71 and the second guide groove 72 are formed so as to intersect with each other at the portion of the outer circumferential surface 21 of the tube 20 where the first tip portion 11 is disposed.

[0044] Therefore, in the region of the outer peripheral surface 21 of the tube 20 where the first fin 10 is arranged, regions where the first guide groove 71 and the second guide groove 72 intersect and regions where the first guide groove 71 and the second guide groove 72 are not formed are alternately arranged along the first fin width direction DR1w. The cross section shown in Fig. 8 is perpendicular to the first fin width direction DR1w and shows a cross section of the region where the first guide groove 71 and the second guide groove 72 intersect. In contrast, the cross section shown in Fig. 9 is perpendicular to the first fin width direction DR1w and shows a cross section of the region where the first guide groove 71 and the second guide groove 72 are not formed.

[0045] The adhesive G for bonding the first fin 10 to the tube 20 is filled into the first guide groove 71 and the second guide groove 72 formed in this manner when the first fin 10 and the tube 20 are bonded together. When the adhesive G is filled into the first guide groove 71 and the second guide groove 72, it flows and spreads inside the first guide groove 71 and the second guide groove 72. The adhesive G is guided along the first guide groove 71 and the second guide groove 72 by the surface tension generated on its surface. Therefore, the adhesive G that is guided and filled into the first guide groove 71 and the second guide groove 72 is arranged so that the size in the depth direction of the groove is approximately uniform. In other words, the adhesive G that is guided and filled into the first guide groove 71 and the second guide groove 72 is arranged so that the film thickness is approximately uniform. In this embodiment, the entire space formed by the first guide groove 71 and the second guide groove 72 is filled with the adhesive G.

[0046] The first fin 10 is bonded to the outer peripheral surface 21 of the tube 20 by the adhesive G arranged in the first guide groove 71 and the second guide groove 72. Of the portions of the first tip portion 11 of the first fin 10 that face the outer peripheral surface 21 of the tube 20, the portions facing the portions where the first guide groove 71 and the second guide groove 72 are formed come into contact with the outer peripheral surface 21 of the tube 20 via the adhesive G. In contrast, of the portions of the first tip portion 11 of the first fin 10 that face the outer peripheral surface 21 of the tube 20, the portions facing the portions where the first guide groove 71 and the second guide groove 72 are not formed come into direct contact with the outer peripheral surface 21 of the tube 20 without the adhesive G interposed therebetween. In other words, a portion of the first fin 10 comes into direct contact with the tube 20 without the adhesive G interposed therebetween.

[0047] Hereinafter, the portion of the first tip portion 11 that directly contacts the tube 20 will be referred to as the direct contact portion 11a, and the portion that does not directly contact the tube 20 but indirectly contacts the tube 20 via the adhesive G will also be referred to as the indirect contact portion 11b.

[0048] 8 to 10, a fillet F is formed by adhesive G at the joint between the first fin 10 and the tube 20. The fillet F is formed on one side and the other side of the first tip portion 11 in the first fin extension direction DR1s. Specifically, the fillet F is formed on one side and the other side of the direct contact portion 11a and the indirect contact portion 11b in the first fin extension direction DR1s.

[0049] This fillet F is formed by the adhesive G being drawn up toward the first tip portion 11 by capillary force that occurs when the first fin 10 is joined to the outer peripheral surface 21 of the tube 20. For this reason, the size of the fillet F in the first fin plate thickness direction DR1t decreases with increasing distance from the first tip portion 11, like the foot of a mountain.

[0050] As shown in FIG. 8, the fillets F formed on one side of the indirect contact portion 11b in the first fin extension direction DR1s and the other side of the first fin extension direction DR1s are connected via the adhesive G filled in the first guide groove 71 and the second guide groove 72. Therefore, the surface tensions of the fillets F formed on one side of the indirect contact portion 11b in the first fin extension direction DR1s and the fillets F formed on the other side of the first fin extension direction DR1s are approximately equal. Therefore, the fillets F formed on one side of the indirect contact portion 11b in the first fin extension direction DR1s and the fillets F formed on the other side of the first fin extension direction DR1s have approximately the same size in the first fin thickness direction DR1t. Hereinafter, the size of the fillet F in the first fin thickness direction DR1t is also referred to as the fillet height Fh.

[0051] Furthermore, the fillet F formed on one side of the indirect contact portion 11b in the first fin extension direction DR1s extends to the ends of the first guide groove 71 and the second guide groove 72 on one side in the first fin extension direction DR1s. The fillet F formed on the other side of the indirect contact portion 11b in the first fin extension direction DR1s extends to the ends of the first guide groove 71 and the second guide groove 72 on the other side in the first fin extension direction DR1s.

[0052] Therefore, the size in the first fin width direction DR1w of the fillet F formed on one side and the other side of the indirect contact portion 11b in the first fin extension direction DR1s can be set by the size in the first fin extension direction DR1s of the first guide groove 71 and the second guide groove 72. In this embodiment, the size in the first fin extension direction DR1s of the first guide groove 71 and the second guide groove 72 is formed to a size that can sufficiently ensure the joining force when joining the first fin 10 and the tube 20. Hereinafter, the size of the fillet F in the first fin extension direction DR1s is also referred to as the fillet width Fw.

[0053] The fillet F formed on one side of the direct contact portion 11a in the first fin extension direction DR1s and the fillet F formed on the other side of the first fin extension direction DR1s are not directly connected, as shown in Fig. 9. However, the fillet F formed on the other side of the direct contact portion 11a in the first fin extension direction DR1s is connected to the fillet F formed on the other side of the indirect contact portion 11b in the first fin extension direction DR1s, as shown in Fig. 10. Furthermore, although not shown, the fillet F formed on one side of the direct contact portion 11a in the first fin extension direction DR1s is connected to the fillet F formed on one side of the indirect contact portion 11b in the first fin extension direction DR1s. As a result, the fillet F formed on one side of the direct contact portion 11a in the first fin extension direction DR1s and the fillet F formed on the other side of the first fin extension direction DR1s are connected via the adhesive G arranged in the first guide groove 71 and the second guide groove 72.

[0054] Therefore, the surface tensions of the fillet F formed on one side of the direct contact portion 11a in the first fin extension direction DR1s and the fillet F formed on the other side of the first fin extension direction DR1s are approximately equal. Therefore, the fillet heights Fh of the fillet F formed on one side of the direct contact portion 11a in the first fin extension direction DR1s and the fillet F formed on the other side of the first fin extension direction DR1s are approximately equal. Furthermore, the fillet F formed on one side of the direct contact portion 11a in the first fin extension direction DR1s has a approximately equal fillet width Fw to the fillet F formed on one side of the indirect contact portion 11b in the first fin extension direction DR1s. Furthermore, the fillet F formed on the other side of the direct contact portion 11a in the first fin extension direction DR1s has a approximately equal fillet width Fw to the fillet F formed on the other side of the indirect contact portion 11b in the first fin extension direction DR1s.

[0055] Therefore, the fillets F formed on one and the other sides of the direct contact portion 11a in the first fin extension direction DR1s can also be set by the size of the first guide grooves 71 and the second guide grooves 72 in the first fin extension direction DR1s.

[0056] As described above, fillet F formed between first tip portion 11 of first fin 10 and outer circumferential surface 21 of tube 20 bonds first fin 10 and tube 20 more firmly.

[0057] Although detailed description will be omitted, the second fin 60 and the tube 20 are joined by the same joining method as the joining method for the first fin 10 and the tube 20. That is, the second tip end 61 of the second fin 60 on one side in the second fin thickness direction DR2t is joined to the inner circumferential surface 22 of the tube 20 by adhesive G arranged on the inner circumferential surface 22 of the tube 20 arranged on one side of the second fin 60 in the second fin thickness direction DR2t. The second tip end 61 of the second fin 60 on the other side in the second fin thickness direction DR2t is joined to the inner circumferential surface 22 of the tube 20 by adhesive G arranged on the inner circumferential surface 22 of the tube 20 arranged on the other side of the second fin 60 in the second fin thickness direction DR2t.

[0058] Grooves (not shown) for filling with adhesive G are formed in the inner circumferential surface 22 of the tube 20, and adhesive G is filled into these grooves for bonding the second fin 60. These grooves are formed in a lattice pattern, similar to the first guide grooves 71 and second guide grooves 72 formed in the outer circumferential surface 21 of the tube 20. That is, the grooves formed in the inner circumferential surface 22 have first grooves that extend at an angle in the second fin extension direction DR2s and the second fin width direction DR2w. The grooves formed in the inner circumferential surface 22 also have second grooves that extend at an angle in the second fin extension direction DR2s and the second fin width direction DR2w and intersect with the direction in which the first grooves extend.

[0059] The second fin 60 is bonded to the inner circumferential surface 22 of the tube 20 by the adhesive G filled in the first and second grooves thus formed. Of the portions of the second tip portion 61 of the second fin 60 facing the inner circumferential surface 22 of the tube 20, the portions facing the portions where the first and second grooves are formed contact the tube 20 via the adhesive G. In contrast, of the portions of the second tip portion 61 of the second fin 60 facing the inner circumferential surface 22 of the tube 20, the portions facing the portions where the first and second grooves are not formed directly contact the inner circumferential surface 22 of the tube 20 without the adhesive G. In other words, a portion of the second tip portion 61 directly contacts the tube 20 without the adhesive G. Furthermore, at the joint between the second fin 60 and the inner circumferential surface 22 of the tube 20, fillets F are formed on one and the other sides of the second tip portion 61 in the second fin extension direction DR2s.

[0060] As described above, portions of the first fins 10 and the second fins 60 are in direct contact with the tubes 20 without the adhesive G. The thermal conductivity of the adhesive resin material contained in the adhesive G is approximately 1 / 100 to 1 / 1000 lower than that of the first fins 10 and the second fins 60, which are made of metal. Therefore, the method of joining the first fins 10 and the second fins 60 to the tubes 20 using the adhesive G reduces the thermal conductivity during heat exchange between the first fins 10 and the second fins 60 and the tubes 20. The reduced thermal conductivity between the first fins 10 and the second fins 60 and the tubes 20 reduces the heat exchange efficiency during heat exchange between the refrigerant circulating in the refrigeration cycle and the air passing through the heat exchanger 1.

[0061] In contrast, in the first fin 10 of this embodiment, a part of the first tip portion 11 is in direct contact with the outer circumferential surface 21 of the tube 20 without the adhesive G. This makes it possible to suppress a decrease in thermal conductivity between the first fin 10 and the tube 20 that occurs when they are joined with the adhesive G.

[0062] Furthermore, a portion of the second tip portion 61 of the second fin 60 is in direct contact with the inner circumferential surface 22 of the tube 20 without the adhesive G. This prevents a decrease in thermal conductivity between the second fin 60 and the tube 20 that occurs when they are joined with the adhesive G. This improves the heat exchange efficiency of the heat exchanger 1.

[0063] Furthermore, a portion of the first tip portion 11 of the first fin 10 is in direct contact with the outer peripheral surface 21 of the tube 20 without the adhesive G. Furthermore, a portion of the second tip portion 61 of the second fin 60 is in direct contact with the inner peripheral surface 22 of the tube 20 without the adhesive G. Therefore, the amount of adhesive G can be reduced compared to a configuration in which adhesive G is provided so that the entire first tip portion 11 and the entire second tip portion 61 are in contact with the tube 20 via the adhesive G.

[0064] Furthermore, the adhesive G of this embodiment contains a filler to enhance thermal conductivity. However, when a filler is mixed into the adhesive G, the adhesiveness of the adhesive G decreases.

[0065] In contrast, the heat exchanger 1 of the present embodiment is configured as described above so that portions of the first fins 10 and the second fins 60 are in direct contact with the tubes 20 without the adhesive G, thereby improving the heat exchange efficiency of the heat exchanger 1. Therefore, even if the filler content is reduced compared to when such a configuration is not used, the heat exchange efficiency can be ensured while ensuring adhesion between the first fins 10 and the second fins 60 and the tubes 20.

[0066] Furthermore, according to the above embodiment, the following effects can be obtained.

[0067] (1) In the above embodiment, the tube 20 has an outer peripheral surface 21 to which the first tip portion 11 is joined. The outer peripheral surface 21 extends in a planar shape and is formed with a first guide groove 71 and a second guide groove 72 that guide adhesive G to the area where the tube 20 and the first fin 10 are joined. The first guide groove 71 and the second guide groove 72 guide adhesive G to the periphery of the area of ​​the first tip portion 11 that directly contacts the tube 20.

[0068] According to this, when adhesive G is applied to outer peripheral surface 21 of tube 20, adhesive G is applied to first guide groove 71 and second guide groove 72. This makes it easier to apply adhesive G around first tip portion 11, thereby ensuring reliable bonding between outer peripheral surface 21 of tube 20 and first fin 10.

[0069] Furthermore, when the tube 20 and the first fin 10 are connected with adhesive G, a fillet F is formed at the joint between the tube 20 and the first fin 10. Like the foot of a mountain, the fillet height Fh of this fillet F decreases with increasing distance from the first tip portion 11, and the fillet F is formed up to the ends of the first guide groove 71 and the second guide groove 72. The smaller the fillet width Fw of the fillet F formed at the joint between the tube 20 and the first fin 10, the lower the bond between the tube 20 and the first fin 10.

[0070] In contrast, the fillet width Fw of the fillet F is set by the size of the first fin extension direction DR1s of the first guide groove 71 and the second guide groove 72. The size of the first fin extension direction DR1s of the first guide groove 71 and the second guide groove 72 is set to a size that can ensure a sufficient joining force when joining the first fin 10 and the tube 20. Therefore, the tube 20 and the first fin 10 can be reliably joined.

[0071] (2) In the above embodiment, the first guide grooves 71 extend at an angle with respect to the first fin extending direction DR1s.

[0072] This makes it possible to reliably bring a portion of the first fin 10 into direct contact with the tube 20 even if the positions of the tube 20 and the first fin 10 deviate from their designed positions in the first fin extension direction DR1s when joining the tube 20 and the first fin 10. That is, compared to forming the first guide groove 71 and the second guide groove 72 only in the portion facing the first tip portion 11, the first guide groove 71 and the second guide groove 72 can be easily formed in the outer peripheral surface 21 of the tube 20 without requiring high design accuracy.

[0073] (3) In the above embodiment, the outer surface 21 is formed with a first guide groove 71 that extends at an incline with respect to the first fin width direction DR1w and a second guide groove 72 that is inclined with respect to the first fin width direction DR1w and extends intersecting the direction in which the first guide groove 71 extends.

[0074] This allows the tube 20 and the first fin 10 to be bonded together by the adhesive G filled in the first guide groove 71 and the second guide groove 72. This increases the area where the tube 20 and the first fin 10 come into contact with the adhesive G compared to when only one of the first guide groove 71 and the second guide groove 72 is formed on the outer circumferential surface 21. This allows the tube 20 and the first fin 10 to be bonded together reliably.

[0075] (First modified example of the first embodiment) In the first embodiment described above, the guide groove 70 includes a first guide groove 71 that extends at an angle in the first fin extension direction DR1s and the first fin width direction DR1w. The guide groove 70 also includes a second guide groove 72 that extends at an angle in the first fin extension direction DR1s and the first fin width direction DR1w and intersects with the direction in which the first guide groove 71 extends. However, the guide groove 70 is not limited to this configuration.

[0076] For example, the guide groove 70 may be configured with only one of the first guide groove 71 and the second guide groove 72 extending at an angle in the first fin extension direction DR1s and the first fin width direction DR1w. For example, as shown in Fig. 11 , the first guide groove 71 may be eliminated from the first embodiment, and only the second guide groove 72 may be included. Alternatively, although not shown, the second guide groove 72 may be eliminated from the first embodiment, and only the first guide groove 71 may be included.

[0077] (Second modified example of the first embodiment) In the first embodiment described above, the guide groove 70 includes a first guide groove 71 that extends at an angle in the first fin extension direction DR1s and the first fin width direction DR1w. The guide groove 70 also includes a second guide groove 72 that extends at an angle in the first fin extension direction DR1s and the first fin width direction DR1w and intersects with the direction in which the first guide groove 71 extends. However, the guide groove 70 is not limited to this configuration.

[0078] For example, the guide groove 70 may include a third guide groove 73 extending along the first fin extending direction DR1s as shown in FIG.

[0079] (Third modified example of the first embodiment) In the first embodiment described above, the guide groove 70 includes a first guide groove 71 that extends at an angle in the first fin extension direction DR1s and the first fin width direction DR1w. The guide groove 70 also includes a second guide groove 72 that extends at an angle in the first fin extension direction DR1s and the first fin width direction DR1w and intersects with the direction in which the first guide groove 71 extends. However, the guide groove 70 is not limited to this configuration.

[0080] 13 and 14, the guide groove 70 may include a fourth guide groove 74 and a fifth guide groove 75 extending along the first fin width direction DR1w. The fourth guide groove 74 is formed on one side of the outer peripheral surface 21 of the tube 20 in the first fin extension direction DR1s at a portion facing the first tip end portion 11. The fifth guide groove 75 is formed on the other side of the outer peripheral surface 21 of the tube 20 in the first fin extension direction DR1s at a portion facing the first tip end portion 11.

[0081] In this way, by forming the fourth guide groove 74 and the fifth guide groove 75 in a portion of the outer circumferential surface 21 of the tube 20 different from the portion facing the first tip portion 11, the entire tip of the first fin 10 can be brought into direct contact with the tube 20. Therefore, compared to a configuration in which only a portion of the tip portion of the first fin 10 is in direct contact with the tube 20, the decrease in thermal conductivity that occurs when bonding with adhesive G is suppressed, and the heat exchange efficiency of the heat exchanger 1 can be improved.

[0082] (Fourth Modification of the First Embodiment) In the first embodiment described above, an example has been described in which first guide groove 71 and second guide groove 72 are formed across one or more first fins 10, but the present invention is not limited to this.

[0083] For example, the first guide groove 71 and the second guide groove 72 may be configured to span only one first fin 10. In this case, the first guide groove 71 and the second guide groove 72 may be configured to be formed in each portion of the outer circumferential surface 21 of the tube 20 that faces each of the plurality of first tip portions 11.

[0084] (Fifth Modification of the First Embodiment) In the above-described first embodiment, an example was described in which the first guide groove 71 and the second guide groove 72 are formed so as to intersect with each other at the portion of the outer surface 21 of the tube 20 where the first tip portion 11 is located, but this is not limited to this.

[0085] For example, the first guide groove 71 and the second guide groove 72 may be formed so as to intersect with each other at a portion of the outer circumferential surface 21 of the tube 20 where the first tip portion 11 is not disposed.

[0086] (Second embodiment) Next, a second embodiment will be described with reference to Fig. 15. This embodiment differs from the first embodiment in that not all of the first tip portions 11 of the first fins 10 are in direct contact with the tubes 20. Other than this, this embodiment is similar to the first embodiment. Therefore, in this embodiment, differences from the first embodiment will be mainly described, and descriptions of similar portions to the first embodiment may be omitted.

[0087] As shown in FIG. 15 , in the heat exchanger 1 of this embodiment, a small amount of adhesive G is interposed between the first fin 10 and the tube 20. That is, the entire first tip portion 11 of this embodiment is not in direct contact with the outer circumferential surface 21, and does not include the direct contact portion 11a of the first embodiment. A portion of the first tip portion 11 of the first fin 10 contacts the tube 20 via a thin film of adhesive G. The adhesive G disposed between the first fin 10 and the tube 20 has a gradient in which the size of the thickness of the first fin 10 in the first fin thickness direction DR1t gradually decreases toward the tip of the first fin 10. The thin film of adhesive G is located at the portion of the adhesive G disposed between the first fin 10 and the tube 20 where the size of the thickness of the first fin 10 in the first fin thickness direction DR1t is smallest. In other words, the thin film of adhesive G is located at the portion of the adhesive G disposed between the first fin 10 and the tube 20 where the distance between the first fin 10 and the outer circumferential surface 21 of the tube 20 is smallest. In FIG. 15, in order to make the thin-film adhesive G easier to understand, the area where the thin-film adhesive G is formed is indicated by a dotted line.

[0088] The reason why a thin film of adhesive G is interposed between the first fin 10 and the tube 20 will be explained below. The first fin 10 and the tube 20 are joined together by the adhesive G arranged in the first guide groove 71 and the second guide groove 72. At this time, the adhesive G arranged in the first guide groove 71 and the second guide groove 72 is sucked up toward the first tip portion 11 by capillary force. For this reason, when the first fin 10 and the tube 20 are joined together, a small amount of adhesive G may be interposed between the first fin 10 and the tube 20. As a result, a thin film of adhesive G is provided between the first tip portion 11 and the outer circumferential surface 21.

[0089] The thickness of the thin film of adhesive G formed in this manner is much smaller than the thickness of the fillet F. The thickness of the thin film of adhesive G is smaller than the size of the first guide grooves 71 and the second guide grooves 72 in the first fin thickness direction DR1t (i.e., the size of the first guide grooves 71 and the second guide grooves 72 in the depth direction). The thickness of the thin film of adhesive G may be 1 / 5 or 1 / 10 of the size of the first guide grooves 71 and the second guide grooves 72 in the first fin thickness direction DR1t. In this embodiment, the thickness of the thin film of adhesive G is 50 μm or less. When such a thin film of adhesive G is interposed between the first fin 10 and the tube 20, the presence of the adhesive G hardly affects the reduction in thermal conductivity between the first fin 10 and the tube 20. In other words, the reduction in thermal conductivity between the first fin 10 and the tube 20 when the thin film of adhesive G is interposed between the first fin 10 and the tube 20 is negligibly small. In other words, even if a thin film of adhesive G is interposed between the first fin 10 and the tube 20, the first fin 10 and the tube 20 can be considered to be in substantial direct contact with each other.

[0090] Furthermore, if the reduction in thermal conductivity between the first fin 10 and the tube 20 when the thin film adhesive G is interposed between the first fin 10 and the tube 20 is negligibly small, the thickness of the thin film adhesive G may be greater than 50 μm, for example, 100 μm.

[0091] The other configurations are the same as those of the first embodiment described above, and therefore, the same effects as those of the first embodiment can be obtained from a configuration that is the same as or equivalent to that of the first embodiment.

[0092] Furthermore, similar to the configuration in which a portion of the first tip portion 11 is in direct contact with the tube 20, it is possible to suppress the decrease in thermal conductivity that occurs when bonding with the adhesive G. Therefore, even in the configuration in which a portion of the first tip portion 11 is in contact with the tube 20 via the thin film adhesive G, it is possible to improve the heat exchange efficiency of the heat exchanger 1 to the same extent as in the configuration of the first embodiment.

[0093] The thin film adhesive G provided between the first tip portion 11 and the outer peripheral surface 21 is guided and arranged along the tip of the first tip portion 11. Therefore, the thin film adhesive G provided between the first tip portion 11 and the outer peripheral surface 21 is formed to have a substantially constant film thickness. Therefore, it is possible to suppress variations in the thermal conductivity between the first fin 10 and the tube 20 caused by variations in the film thickness of the thin film adhesive G.

[0094] Although the present embodiment has been described with reference to an example in which a thin film of adhesive G is formed between the first fin 10 and the tube 20, a thin film of adhesive G may also be formed between the second fin 60 and the tube 20. Even in this case, the heat exchange efficiency of the heat exchanger 1 can be improved to the same extent as in the configuration of the first embodiment, as in the case in which a thin film of adhesive G is formed between the first fin 10 and the tube 20.

[0095] (Third embodiment) Next, a third embodiment will be described with reference to FIG. 16. In this embodiment, the first guide groove 71 and the second guide groove 72 are eliminated, and the shape of the first tip portion 11 of the first fin 10 differs from that of the first embodiment. Other than this, the third embodiment is similar to the first embodiment. Therefore, in this embodiment, differences from the first embodiment will be mainly described, and descriptions of similar portions to the first embodiment may be omitted.

[0096] 16, the first tip portion 11 of this embodiment has one protrusion 11c at the tip of the first tip portion 11 that protrudes toward the tube 20. The protrusion 11c is formed so that the portion of the first tip portion 11 of the first fin 10 that is curved so as to bulge toward the tube 20, closest to the tube 20, bulges further toward the tube 20. The protrusion 11c extends along the first fin width direction DR1w at the tip of the first tip portion 11 and is formed in a semi-cylindrical shape. The cross section of the protrusion 11c perpendicular to the air flow direction has an arc shape.

[0097] The protrusion 11c in this embodiment directly contacts the outer peripheral surface 21 of the tube 20 without the adhesive G. In contrast, the portions of the protrusion 11c in the first tip portion 11 on one side and the other side in the first fin extension direction DR1s contact the outer peripheral surface 21 of the tube 20 via the adhesive G.

[0098] The cross-sectional shape of the protrusion 11c perpendicular to the air flow direction is not limited to an arc shape, but may be rectangular or triangular, for example.

[0099] The other configurations are the same as those of the first embodiment described above, and therefore, the same effects as those of the first embodiment can be obtained from a configuration that is the same as or equivalent to that of the first embodiment.

[0100] Furthermore, by configuring first tip portion 11 to have protrusion 11c, the space between first tip portion 11 and tube 20 is larger than in a configuration without protrusion 11c. This allows the amount of adhesive G between first tip portion 11 and tube 20 to be increased, and therefore, first fin 10 can be reliably bonded to tube 20 by adhesive G.

[0101] In the present embodiment, an example has been described in which protrusion 11c is provided on first tip 11 of first fin 10, but protrusion 11c may be formed on second tip 61 of second fin 60. Even in this case, as in the case in which protrusion 11c is provided on first tip 11, second fin 60 can be reliably joined to tube 20 by adhesive G.

[0102] (First Modification of the Third Embodiment) In the above-described third embodiment, an example has been described in which one protrusion 11c protruding toward the tube 20 is provided at the tip of the first tip portion 11, but the present invention is not limited to this. For example, a plurality of protrusions 11c may be provided at the first tip portion 11.

[0103] (Second Modification of the Third Embodiment) In the above-described third embodiment, an example has been described in which a portion of the protrusion 11c directly contacts the outer circumferential surface 21 of the tube 20 without the adhesive G therebetween, but the present invention is not limited to this. For example, the protrusion 11c may be configured to contact the tube 20 via a thin film of adhesive G, as described in the second embodiment.

[0104] (Third Modification of the Third Embodiment) In the third embodiment described above, an example has been described in which the protrusion 11c extends along the first fin width direction DR1w at the tip of the first tip portion 11 and is formed in a semi-cylindrical shape, but the present invention is not limited to this. For example, the protrusion 11c may be hemispherical, and multiple protrusions 11c may be formed along the first fin width direction DR1w.

[0105] (Fourth embodiment) Next, a fourth embodiment will be described with reference to FIG. 17. In this embodiment, the first guide groove 71 and the second guide groove 72 are eliminated, and the shape of the first tip portion 11 of the first fin 10 differs from that of the first embodiment. Other than this, the fourth embodiment is similar to the first embodiment. Therefore, in this embodiment, differences from the first embodiment will be mainly described, and descriptions of similar portions to the first embodiment may be omitted.

[0106] As shown in Fig. 17, the first tip portion 11 of this embodiment has one recess 11d formed at the tip of the first tip portion 11, recessed on the side opposite to the outer peripheral surface 21 of the tube 20. The recess 11d is formed by curving a recessed portion of the first tip portion 11 of the first fin 10 in the first fin extension direction DR1s toward the center of the first fin 10 in the first fin thickness direction DR1t. In other words, the recess 11d is formed by recessing on the side opposite to the side joined to the tube 20. The cross section of the recess 11d perpendicular to the air flow direction has an arc shape. The recess 11d is formed to penetrate along the first fin width direction DR1w.

[0107] The first tip portion 11 having such a recess 11d has a W-shaped cross section in the first fin width direction DR1w, i.e., perpendicular to the air flow direction in the air passage AP. In other words, the first tip portion 11 has a shape in which one and the other sides of the recess 11d in the first fin extension direction DR1s protrude toward the tube 20.

[0108] The first tip portion 11 has portions on one side and the other side of the recess 11d protruding toward the tube 20 in the first fin extension direction DR1s that come into direct contact with the outer circumferential surface 21 of the tube 20 without the adhesive G interposed therebetween.

[0109] Moreover, adhesive G is placed in the space formed between the recess 11d and the tube 20. As a result, the recess 11d of the first tip portion 11 comes into contact with the outer circumferential surface 21 of the tube 20 via the adhesive G.

[0110] The cross-sectional shape of the recess 11d perpendicular to the air flow direction is not limited to an arc shape, but may be rectangular or V-shaped, for example.

[0111] The first fin 10 including the first tip portion 11 having the recess 11d in this manner is bonded to the tube 20 by the adhesive G placed in the recess 11d.

[0112] The other configurations are the same as those of the first embodiment described above, and therefore, the same effects as those of the first embodiment can be obtained from a configuration that is the same as or equivalent to that of the first embodiment.

[0113] Furthermore, by configuring first tip portion 11 to have recess 11d, the contact area between first tip portion 11 and adhesive G can be increased compared to a configuration without recess 11d. Therefore, first fin 10 can be reliably joined to tube 20 by adhesive G.

[0114] In the present embodiment, an example has been described in which recess 11d is provided in first tip portion 11 of first fin 10, but recess 11d may be formed in second tip portion 61 of second fin 60. Even in this case, second fin 60 can be reliably joined to tube 20 by adhesive G, just as in the case in which recess 11d is provided in first tip portion 11.

[0115] (Modification of the fourth embodiment) In the above-described fourth embodiment, an example has been described in which the portions of the recess 11d on one side and the other side in the first fin extension direction DR1s directly contact the outer circumferential surface 21 of the tube 20 without the adhesive G interposed therebetween. However, the present invention is not limited to this. For example, the portions of the recess 11d on one side and the other side in the first fin extension direction DR1s may be configured to contact the tube 20 via a thin film of adhesive G, as described in the second embodiment.

[0116] (Fifth embodiment) Next, a fifth embodiment will be described with reference to FIG. 18. In this embodiment, the shape of the first tip portion 11 of the first fin 10 is different from that of the fourth embodiment. Other than this, the fifth embodiment is similar to the fourth embodiment. Therefore, in this embodiment, differences from the fourth embodiment will be mainly described, and descriptions of similar portions to the fourth embodiment may be omitted.

[0117] The first fin 10 of this embodiment is formed by bending a plate-like member into a wave shape, and has a first tip portion 11, which is the tip of the wave-shaped plate-like member, with a straight portion 11e extending in a plane along the outer peripheral surface 21 of the tube 20, as shown in Fig. 20. The straight portion 11e is formed in a plane along the first fin extension direction DR1s and the first fin width direction DR1w. The straight portion 11e has a plurality of recesses 11d formed by being recessed on the side opposite to the outer peripheral surface 21 of the tube 20. Each of the plurality of recesses 11d is formed by being curved so as to be recessed toward the center of the first fin 10 in the first fin plate thickness direction DR1t.

[0118] The first tip portion 11 having such a plurality of recesses 11d has a cross section perpendicular to the air flow direction that has a plurality of recesses and protrusions. In other words, the cross section perpendicular to the air flow direction of the first tip portion 11 has a shape in which a plurality of recesses 11d and a plurality of protrusions 11f are alternately arranged along the first fin extension direction DR1s in the straight portion 11e. The protrusions 11f are portions that protrude toward the outer peripheral surface 21 of the tube 20 compared to the recesses 11d.

[0119] The first tip portion 11 has a protrusion 11f that protrudes toward the tube 20 and comes into direct contact with the outer circumferential surface 21 of the tube 20 without the adhesive G. In contrast, the recess 11d comes into contact with the outer circumferential surface 21 of the tube 20 via the adhesive G.

[0120] The first fin 10 including the first tip portion 11 having the recess 11d in this manner is bonded to the tube 20 by the adhesive G placed in the recess 11d.

[0121] The other configurations are the same as those of the fourth embodiment described above, and therefore, the same effects as those of the fourth embodiment can be obtained from a configuration similar to or equivalent to that of the fourth embodiment.

[0122] Furthermore, compared to a configuration in which only one recess 11d is provided, it is easier to increase the contact area between first tip portion 11 and adhesive G. Therefore, first fin 10 can be reliably joined to tube 20 by adhesive G.

[0123] In the present embodiment, an example has been described in which multiple recesses 11d and multiple protrusions 11f are provided in the straight portion 11e of the first tip portion 11 of the first fin 10. However, if the second tip portion 61 of the second fin 60 has a similar straight portion 11e, multiple recesses 11d and multiple protrusions 11f may be formed in the straight portion 11e. Even in this case, the second fin 60 can be reliably joined to the tube 20 by the adhesive G, just as in the case in which the first tip portion 11 has recesses 11d.

[0124] (Modification of the fifth embodiment) In the above-described fifth embodiment, an example has been described in which the protrusion 11f directly contacts the outer circumferential surface 21 of the tube 20 without the adhesive G therebetween, but the present invention is not limited to this. For example, the protrusion 11f may be configured to contact the tube 20 via a thin film of adhesive G, as described in the second embodiment.

[0125] (Sixth embodiment) Next, a sixth embodiment will be described with reference to FIG. 19. In this embodiment, the shape of the recess 11d is different from that of the fourth embodiment. The rest is the same as in the fourth embodiment. Therefore, in this embodiment, differences from the fourth embodiment will be mainly described, and descriptions of similar parts to the fourth embodiment may be omitted.

[0126] In this embodiment, a plurality of recesses 11d are formed along the first fin width direction DR1w, as shown in Fig. 19. The recesses 11d are formed to penetrate the first tip portion 11 along the first fin extension direction DR1s, and have an arc-shaped cross section in the first fin extension direction DR1s.

[0127] The first tip portion 11 having the plurality of recesses 11d has a shape in which the plurality of recesses 11d and the plurality of protrusions 11f are alternately arranged along the first fin width direction DR1w. The protrusions 11f are portions that protrude toward the outer peripheral surface 21 of the tube 20 compared to the recesses 11d.

[0128] The first tip portion 11 has a protrusion 11f that protrudes toward the tube 20 and comes into direct contact with the outer circumferential surface 21 of the tube 20 without the adhesive G. In contrast, the recess 11d comes into contact with the outer circumferential surface 21 of the tube 20 via the adhesive G.

[0129] The first fin 10 including the first tip portion 11 having the recess 11d in this manner is bonded to the tube 20 by the adhesive G placed in the recess 11d.

[0130] The other configurations are the same as those of the fourth embodiment described above, and therefore, the same effects as those of the fourth embodiment can be obtained from a configuration similar to or equivalent to that of the fourth embodiment.

[0131] Furthermore, compared to a configuration in which only one recess 11d is provided, it is easier to increase the contact area between first tip portion 11 and adhesive G. Therefore, first fin 10 can be reliably joined to tube 20 by adhesive G.

[0132] In the present embodiment, an example has been described in which multiple recesses 11d are provided in the first tip portion 11 of the first fin 10. However, the second fin 60 has multiple recesses 11d in the second tip portion 61. Even in this case, the second fin 60 can be reliably joined to the tube 20 by the adhesive G, just as in the case in which the recesses 11d are provided in the first tip portion 11.

[0133] (Modification of the sixth embodiment) In the sixth embodiment described above, an example has been described in which the protrusion 11f directly contacts the outer circumferential surface 21 of the tube 20 without the adhesive G therebetween, but the present invention is not limited to this. For example, the protrusion 11f may be configured to contact the tube 20 via a thin film of adhesive G, as described in the second embodiment.

[0134] (Other embodiments) Representative embodiments of the present disclosure have been described above, but the present disclosure is not limited to the above-described embodiments and can be modified in various ways, for example, as follows.

[0135] In the above-described embodiment, the heat exchanger 1 is a fin-tube heat exchanger of a stacked type in which the tubes 20 are arranged in a stacked configuration. However, the present invention is not limited to this. For example, the heat exchanger 1 may be a fin-plate heat exchanger of a stacked type in which multiple plates P are arranged in a stacked configuration, as shown in FIGS. 20 to 22 . When the heat exchanger 1 is a fin-plate heat exchanger, for example, refrigerant passages RP and cooling water flows WP through which cooling water (fluid) flows are alternately formed in the stacking direction in the gaps between the multiple plates P. Inner fins IF are provided between adjacent plates P in the stacking direction among the multiple plates P. The inner fins IF are bonded to the plate P arranged on one side of the stacking direction and the plate P arranged on the other side of the stacking direction with an adhesive G. When the heat exchanger 1 is a fin-plate heat exchanger, the plates P function as flow path forming portions that form flow path portions.

[0136] The plate P and the inner fin IF can be joined using the same method as that used to join the tubes 20 and the first fins 10 described in the above embodiments. This can suppress a decrease in thermal conductivity between the plate P and the inner fin IF that occurs when joining them with adhesive G, thereby improving the heat exchange efficiency of the heat exchanger 1. Note that the fins arranged in this heat exchanger 1 may be offset fins, as shown in Fig. 22, in which thin metal plate members made of aluminum or the like are bent into a wave shape and adjacent cut-and-raised portions are offset from each other in the air flow direction.

[0137] In the above embodiment, an example has been described in which the entire space formed by the first guide groove 71 and the second guide groove 72 is filled with adhesive G, but this is not limiting. For example, adhesive G may be filled in only a portion of the space formed by the first guide groove 71 and the second guide groove 72.

[0138] In the above embodiment, an example has been described in which the heat exchanger 1, which is a fin-tube heat exchanger, has the second fins 60 inside the tubes 20, but this is not limiting. For example, the heat exchanger 1, which is a fin-tube heat exchanger, may be configured not to have the second fins 60 inside the tubes 20.

[0139] In the above-described first and second embodiments, examples have been described in which the guide grooves 70 are formed on the outer peripheral surface 21 and the inner peripheral surface 22 of the tube 20, but the present invention is not limited to this. For example, the guide grooves 70 may not be formed on the outer peripheral surface 21 and the inner peripheral surface 22 of the tube 20.

[0140] In the above-described third to sixth embodiments, examples have been described in which the guide grooves 70 are not formed on the outer peripheral surface 21 and the inner peripheral surface 22 of the tube 20, but the present invention is not limited to this. For example, the guide grooves 70 may be formed on the outer peripheral surface 21 and the inner peripheral surface 22 of the tube 20.

[0141] In the above-described embodiments, it goes without saying that the elements constituting the embodiments are not necessarily essential unless they are specifically stated as essential or are clearly considered essential in principle.

[0142] In the above-described embodiments, when numerical values ​​such as the number, values, amounts, ranges, etc. of components of the embodiments are mentioned, they are not limited to the specific numbers unless they are specifically stated as essential or are clearly limited to a specific number in principle.

[0143] In the above-described embodiments, when referring to the shapes, positional relationships, etc. of components, etc., the shapes, positional relationships, etc. are not limited to those unless otherwise specified or when they are fundamentally limited to specific shapes, positional relationships, etc. [Explanation of symbols]

[0144] 10, 60 fins 11 Tip 12 Stretching section 20 Flow path forming section 70 Guide groove AP, RP flow path section G. Adhesive

Claims

1. A stacked heat exchanger, a plurality of flow path forming portions (20, P) that form flow path portions (AP, RP, WP) through which a fluid flows; a fin (10, 60, IF) joined to the flow path forming portion by an adhesive (G), The fin is formed by bending a plate-like member into a wave-like shape, and a plurality of tip portions (11, 61) joined to the flow path forming portion and extension portions (12, 62) extending so as to connect the adjacent tip portions are alternately arranged, and at least a part of the tip portions is in direct contact with the flow path forming portion without the adhesive therebetween, The flow path forming portion has a joining surface (21, 22) to which the tip portion is joined, the joining surface extends in a plane and has guide grooves (70, 71, 72, 73, 74, 75) that guide the adhesive to the area where the flow path forming portion and the fin are joined, The guide groove guides the adhesive to the periphery of a portion of the tip portion that directly contacts the flow path forming portion, and when a direction in which the plurality of tip portions and the plurality of extension portions are alternately arranged is defined as a fin extension direction (DR1s, DR2s), the guide groove includes a first guide groove (71) that extends at an angle with respect to the fin extension direction and a second guide groove (72) that is at an angle with respect to the fin extension direction and extends intersecting the direction in which the first guide groove extends, The first guide groove and the second guide groove intersect with each other at a portion of the joint surface where the tip end portion is disposed.

2. A stacked heat exchanger, a plurality of flow path forming portions (20, P) that form flow path portions (AP, RP, WP) through which a fluid flows; a fin (10, 60, IF) joined to the flow path forming portion by an adhesive (G), The fin is formed by bending a plate-like member into a wave-like shape, and a plurality of tip portions (11, 61) joined to the flow path forming portion and extension portions (12, 62) extending so as to connect the tip portions adjacent to each other are formed alternately, and at least a part of the tip portions contacts the flow path forming portion via the thin film-like adhesive, The flow path forming portion has a joining surface (21, 22) to which the tip portion is joined, the joining surface extends in a plane and has guide grooves (70, 71, 72, 73, 74, 75) that guide the adhesive to the area where the flow path forming portion and the fin are joined, The guide groove guides the adhesive through a thin film of the adhesive at the tip end portion to the periphery of the portion that contacts the flow path forming portion, and when the direction in which the plurality of tip end portions and the plurality of extension portions are alternately arranged is defined as a fin extension direction (DR1s, DR2s), the guide groove includes a first guide groove (71) that extends at an angle with respect to the fin extension direction and a second guide groove (72) that is at an angle with respect to the fin extension direction and extends intersecting the direction in which the first guide groove extends, The first guide groove and the second guide groove intersect with each other at a portion of the joint surface where the tip end portion is disposed.

3. The tip portion has a protruding portion (11c) that protrudes toward the flow path forming portion, 3. The stacked heat exchanger according to claim 1, wherein the fins are bonded to the flow passage forming portion by the adhesive disposed around the protrusions.

4. The tip portion has a recess (11d) formed by being recessed on the side opposite to the side joined to the flow path forming portion, 4. A stacked heat exchanger according to claim 1, wherein the fins are bonded to the flow path forming portion by the adhesive disposed around the tip portion and the adhesive disposed in the recess portion.

5. The tip portion has a straight portion (11e) extending in a plane along a surface of the flow path forming portion on the side where the tip portion is joined, The stacked heat exchanger according to claim 4 , wherein a plurality of the recesses are formed in the straight portion.

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