A heat exchanger

Abstract

The application relates to a heat exchanger, comprising a plurality of fins and a plurality of heat exchange pipes, the plurality of fins are arranged in layers, the fins have a plurality of opening parts, the plurality of opening parts are arranged at intervals along the length direction of the fins, and the plurality of heat exchange pipes are arranged in at least part of the opening parts respectively; the fin comprises a first groove body and a plurality of second groove bodies, the width direction of the fin is defined as a first direction, the first groove body is located on one side of the opening part along the first direction, the length direction of the first groove body extends at least partially along the length direction of the fin, and one side of the first groove body is recessed in the thickness direction of the fin; the second groove body is located between two adjacent opening parts, the second groove body is recessed on one side in the thickness direction of the fin, the recess direction of the second groove body is the same as that of the first groove body, and one end of the second groove body along the length direction is connected with the first groove body; and the heat exchanger has better drainage performance.

Description

Technical Field

[0001] This application relates to the field of heat exchange technology, specifically to a heat exchanger for a heat pump. Background Technology

[0002] Finned heat exchangers have better heat exchange performance than traditional corrugated finned heat exchangers. However, during the drainage process, some of the condensate on the finned heat exchangers is obstructed by the heat exchange tubes, causing the condensate to accumulate and stagnate in the vicinity of the heat exchange tubes. The inability to drain the condensate in time will affect the heat exchange performance of the heat exchanger in high humidity or low temperature environments, and will also increase the risk of frosting and corrosion. Utility Model Content

[0003] This application provides a heat exchanger with better drainage performance.

[0004] The heat exchanger provided in this application includes multiple fins and multiple heat exchange tubes. The multiple fins are stacked and arranged in a stacked manner. Each fin has multiple openings, which are spaced apart along the length direction of the fin. The multiple heat exchange tubes are respectively disposed within at least a portion of the openings. Each fin includes a first groove and multiple second grooves. The width direction of the fin is defined as a first direction. The first groove is located on one side of the opening along the first direction, and the length direction of the first groove extends at least partially along the length direction of the fin. The first groove is recessed on one side of the thickness direction of the fin. The second groove is located between two adjacent openings. The second groove is recessed on one side of the thickness direction of the fin, and the concave direction of the second groove is the same as the concave direction of the first groove. One end of the second groove along the length direction is connected to the first groove.

[0005] In this heat exchanger, a second groove is located between two adjacent openings in the fins. One end of the second groove is connected to the first groove along its length. The length of the first groove extends at least partially along the length of the fin. The first and second grooves are respectively recessed on one side of the fin's thickness direction, and their recesses are in the same direction. During operation, condensate on the fins flows into the second groove, then into the first groove, and then flows along the length of the first groove and is discharged to the outside of the fins. This reduces the accumulation and retention of condensate near the heat exchange tubes, allowing the condensate on the fins to be discharged more quickly, thus giving the heat exchanger better drainage performance. Attached Figure Description

[0006] Figure 1 A schematic diagram of the structure of the heat exchanger provided in this application in a specific embodiment; Figure 2 for Figure 1 A schematic diagram of the structure of the heat exchanger fins in the first specific embodiment; Figure 3 for Figure 1 A schematic diagram of the structure of the heat exchanger fins in the second specific embodiment; Figure 4 for Figure 1 A schematic diagram of the structure of the heat exchanger fins in the third specific embodiment; Figure 5 for Figure 1 A schematic diagram of the structure of the heat exchanger fins in the fourth specific embodiment; Figure 6 This is a schematic diagram of the connection structure between the fins and the heat exchange tube in a specific embodiment. Figure 7 for Figure 1 A schematic diagram of the structure of the heat exchanger fins in the fifth specific embodiment; Figure 8 for Figure 1 A schematic diagram of the structure of the heat exchanger fins in the sixth specific embodiment.

[0007] Reference numerals: fin 1, opening 11, first opening 111, first groove 12, second groove 13, first protrusion 14, first ridge 141, ridge group 142, first convex surface 143, second convex surface 144, second slot 145, window 15, first slot 151, first side 16, second side 17, second protrusion 18, second ridge 181, third convex surface 182, fourth convex surface 183, third slot 184, third groove 19, heat exchange tube 2, channel 21, first manifold 3, second manifold 4.

[0008] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0009] To better understand the technical solution of this application, the embodiments of this application are described below with reference to the accompanying drawings.

[0010] It should be understood that the term "and / or" used in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this application generally indicates that the preceding and following related objects have an "or" relationship.

[0011] It should be noted that the directional terms such as "upper," "lower," "left," and "right" used in this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element.

[0012] like Figure 1-8 As shown, this application embodiment provides a heat exchanger including multiple fins 1 and multiple heat exchange tubes 2. The multiple fins 1 are stacked and arranged, and each fin 1 has multiple openings 11. The multiple openings 11 are spaced apart along the length direction of the fin 1, and the multiple heat exchange tubes 2 are respectively disposed in at least a portion of the openings 11. The fin 1 includes a first groove 12 and multiple second grooves 13. If the width direction of the fin 1 is defined as the first direction, the first groove 12 is located on one side of the opening 11 along the first direction, and the length direction of the first groove 12 extends at least partially along the length direction of the fin 1. The first groove 12 is recessed on one side of the thickness direction of the fin 1. The second groove 13 is located between two adjacent openings 11, and the second groove 13 is recessed on one side of the thickness direction of the fin 1. The recessed direction of the second groove 13 is the same as the recessed direction of the first groove 12. One end of the second groove 13 along the length direction is connected to the first groove 12.

[0013] In this embodiment, the fins 1 are thin sheet-like structures, with multiple fins 1 arranged at intervals along the same direction, and a preset gap between adjacent fins 1. This gap can be achieved through the flanges or other structures of the fins 1. The heat exchange tube 2 is inserted or inserted into the opening 11 of the fins 1. When the heat exchanger is working, the gap between adjacent fins 1 allows airflow to pass through, thereby enabling heat exchange between the airflow and the fins 1 and the heat exchange tube 2. Furthermore, the heat exchange tube 2 can be a microchannel flat tube or a multichannel round tube, or it can be other single-channel heat exchange tube structures, such as a single-channel flat tube or round tube. Because microchannel flat tubes have better heat exchange performance, in the various embodiments of this application, the heat exchange tube 2 is preferably a microchannel flat tube, which will not be elaborated further below.

[0014] Furthermore, in this embodiment, multiple heat exchange tubes 2 are respectively disposed within at least a portion of the opening 11, indicating that heat exchange tubes 2 can be disposed in all openings 11. Of course, a portion of the opening 11 can be reserved without heat exchange tubes 2 for other purposes, such as serving as collection holes for fin collection. Similarly, the length direction of the first tank 12 extends at least partially along the length direction of the fin 1, indicating that the length direction of the first tank 12 can extend completely along the length direction of the fin 1, or it can only extend partially along the length direction of the fin 1. For example, the first tank 12 can be partially inclined or bent, or have a curved structure, etc., as long as it extends at least partially along the length direction of the fin 1. Generally speaking, the drainage effect is better when the length direction of the first tank 12 extends completely along the length direction of the fin 1. Therefore, in this embodiment, it is preferable that the length direction of the first tank 12 extends completely along the length direction of the fin 1.

[0015] In addition to the structure mentioned above, the heat exchanger described in this paper also includes a first manifold 3 and a second manifold 4, which are arranged alternately. One end of each heat exchange tube 2 is connected to the first manifold 3, and the other end is connected to the second manifold 4. Both the first and second manifolds 3 and 4 are provided with inlets for refrigerant entry and exit. During operation, the first and second manifolds 3 and 4 are preferably placed vertically. The refrigerant can enter the first manifold 3 through its inlet, then flow into the multiple heat exchange tubes 2 connected to it via distribution methods, and finally converge into the second manifold 4, exiting the heat exchanger through its inlet. Furthermore, when the heat exchanger has two or more rows, the number of first and second manifolds 3 and 4, or the number of heat exchange tubes 2, or the heat exchange tubes 2 can be increased to meet structural design requirements. These methods will not be elaborated upon in this paper.

[0016] In the heat exchanger fins 1, a second groove 13 is located between two adjacent openings 11. One end of the second groove 13 along its length is connected to a first groove 12. The length of the first groove 12 extends at least partially along the length of the fins 1. The first groove 12 and the second groove 13 are respectively recessed on one side of the thickness direction of the fins 1, and their recessed directions are the same. When the heat exchanger is working, condensate on the fins 1 can flow into the second groove 13 and then into the first groove 12 along the second groove 13. It then flows along the length of the first groove 12 and is discharged to the outside of the fins 1, thereby reducing the accumulation and retention of condensate in the area near the heat exchange tubes. This allows the condensate on the fins 1 to be discharged more quickly, thus giving the heat exchanger better drainage performance.

[0017] like Figure 2As shown, in one specific embodiment, the length direction of the first groove 12 extends along the length direction of the fin 1, and the length direction of the second groove 13 is inclined to the first direction. If the angle between the second groove 13 and the first direction is defined as α, then: 5°≤α≤30°.

[0018] Specifically, when the heat exchanger is in operation and the fins 1 are arranged vertically, the second tank 13 is located near the corresponding opening 11 on the bottom side. That is, the distance between the second tank 13 and the opening 11 on the bottom side is much greater than the distance between it and the opening 11 on the top side. This arrangement facilitates the effective utilization of the limited area of ​​the fins 1 and also facilitates the drainage of condensate from the fins 1. Furthermore, because the amount of condensate drainage required by the second tank 13 is less than that of the first tank 12, the width of the second tank 13 can be set to be smaller than the width of the first tank 12, or the depth of the second tank 13 can be set to be smaller than the depth of the first tank 12. These details will not be elaborated upon here.

[0019] Furthermore, the angle between the second tank 13 and the width direction of the fin 1 is 5°~30°. This facilitates the entry of condensate in the second tank 13 into the first tank 12. If the inclination angle of the second tank 13 is too small, the condensate will stagnate in the second tank 13 to a certain extent, which is not conducive to the drainage of the condensate. If the angle is too large, the second tank 13 will occupy a large area on the fin 1, which is not conducive to the compactness of the fin 1 structure. Therefore, when the angle between the second tank 13 and the width direction of the fin 1 is 5°~30°, it can not only meet the drainage performance of the fin 1 well, but also make the overall layout structure of the fin 1 more compact.

[0020] like Figure 2 As shown, in one specific embodiment, the fin 1 further includes a plurality of first protrusions 14, the first protrusions 14 being located between two adjacent openings 11, the first protrusions 14 protruding outward on one side of the thickness direction of the fin 1, and the outward protrusion direction of the first protrusions 14 being the same as the inward concave direction of the second groove 13, and the first protrusions 14 being connected to the second groove 13.

[0021] In this embodiment, the first protrusion 14 provided on the fin 1 can further enhance the overall heat exchange effect of the fin 1. Specifically, when the airflow passes through the first protrusion 14, the first protrusion 14, which protrudes outward from one side of the fin 1 in the thickness direction, can help to disrupt the laminar boundary layer on the air side and enhance air-side turbulence, thereby enhancing the heat exchanger's heat exchange performance. In addition, the first protrusion 14 can also act as a reinforcing rib, thereby increasing the overall strength of the fin 1. At the same time, because the first protrusion 14 is connected to the second tank 13 at the end facing the second tank 13, it can also guide the condensate on the fin 1 into the second tank 13, thereby promoting drainage.

[0022] like Figure 3-4 As shown, in one specific embodiment, the fin 1 further includes a plurality of windows 15, which are located between two adjacent openings 11. The windows 15 and the first protrusions 14 are arranged alternately along a first direction, or the windows 15 are located on the side of the first protrusions 14 away from the first groove 12. The windows 15 have a plurality of first slits 151, which are spaced apart along the first direction. Generally, the number of windows 15 is equal to the number of first protrusions 14.

[0023] Preferably, the window 15 can be arranged on the side of the first protrusion 14 away from the first tank 12. When the heat exchanger is working, one side of the first protrusion 14 is the windward side, and the side of the window 15 is the leeward side. On the windward side, the temperature difference between the air and the fins 1 is higher, and the water vapor in the air is easily condensed into liquid water when it cools down. Therefore, when the first protrusion 14 is the windward side, the condensate can be discharged through the first protrusion 14 and the first tank 12. At the same time, the first protrusion 14 being located on the windward side is also more conducive to heat exchange. On the leeward side, the temperature difference between the air and the fins 1 is reduced, and less condensate is generated, so the drainage demand is also reduced accordingly. Therefore, the window 15 can be set on the side closer to the leeward side. When the air passes through the multiple first slits 151 on the window 15, the first slits 151 can change the airflow direction, enhance the disturbance between adjacent airflow channels, and strengthen heat exchange. That is, this arrangement can make the fins 1 more balanced in terms of drainage performance and heat exchange performance.

[0024] like Figure 2 As shown, in one specific embodiment, the first protrusion 14 includes a plurality of first protrusions 141, which are arranged continuously or at intervals along a first direction. One end of the first protrusion 141 along its length is connected to the second groove 13, and the other end along its length is at a predetermined distance from the opening 11. In this embodiment, the first protrusion 14 includes a plurality of first protrusions 141. One end of the first protrusion 141 along its length is connected to the second groove 13, thereby guiding condensate into the second groove 13. The other end of the first protrusion 141 along its length is close to the opening 11, that is, the top side is close to the opening 11. The first protrusions 141 can be arranged obliquely or vertically, which can be adjusted according to actual needs. However, the oblique arrangement has a better guiding effect on condensate, so the oblique arrangement is preferred in this embodiment.

[0025] like Figure 5 As shown, in one specific embodiment, at least two first protrusions 141 arranged one or more consecutively are defined as a protrusion group 142. Multiple protrusion groups 142 are arranged at intervals along a first direction. In the direction from one end of the second groove 13 connected to the first groove 12 to the other end of the second groove 13, the number of first protrusions 141 included in the protrusion group 142 decreases linearly.

[0026] As mentioned in the above embodiments, the windward side has a better heat exchange effect. When the heat exchanger is working, one side of the first groove 12 can be regarded as the windward side. The airflow flows from the end of the second groove 13 connected to the first groove 12 to the other end of the second groove 13. Therefore, along this direction, after the number of the first protrusions 141 in the protrusion group 142 decreases linearly, each protrusion group 142 is arranged from dense to sparse along the airflow direction. When the airflow passes through each protrusion group 142, because the protrusion group 142 containing more first protrusions 141 is closer to the windward side, it is beneficial to further enhance the air-side disturbance, increase the effective heat transfer area of ​​the fin 1, and improve the heat exchange efficiency of the fin. On the other hand, the further the airflow moves to the leeward side, the lower the temperature difference between the air and the fin 1, and the worse the air-side heat exchange effect. The number of first protrusions 141 contained is less, or the arrangement of the protrusion group 142 is sparser, which can avoid increasing the airflow resistance, thereby making the fin 1 have better heat exchange performance.

[0027] like Figure 6 As shown, in one specific embodiment, the angle between the first convex strip 141 and the fin 1 along its length is less than or equal to 30°. The first convex strip 141 includes a first convex surface 143 and a second convex surface 144. The first convex surface 143 and the second convex surface 144 have a preset angle. At least one second slit 145 is provided on the first convex surface 143 and / or the second convex surface 144.

[0028] In this embodiment, the first convex surface 143 and the second convex surface 144 make the cross-section of the first convex strip 141 triangular. After multiple first convex strips 141 are arranged continuously, the first convex surface 143 and the second convex surface 144 between two adjacent first convex strips 141 form a slit for condensate to flow. The condensate can flow along the slit and enter the second tank 13. Generally, the widths of the first convex surface 143 and the second convex surface 144 are equal, that is, the cross-section of the first convex strip 141 is an isosceles triangle. In addition, the second slit 145 provided on the first convex surface 143 and / or the second convex surface 144 can guide a part of the airflow to the adjacent airflow channel, that is, to make the airflow on one side of the fin 1 thickness direction flow to the other side of the fin 1 thickness direction, enhance the turbulence between the air on both sides of the fin 1, thereby improving the heat transfer performance of the fin 1.

[0029] like Figure 5-7 As shown, in one specific embodiment, the fin 1 has a first side 16 and a second side 17 in the length direction, the opening portion 11 has a first opening 111, the first opening 111 penetrates the first side 16, and the first groove 12 is located on the side of the opening portion 11 facing the second side 17.

[0030] In this embodiment, the first opening 111 of the fin 1 extends through the first side 16, meaning the fin is a comb-shaped thin fin. The heat exchange tube 2 can be inserted into the opening 11 through the first opening 111. Of course, the heat exchange tube 2 can be completely located inside the opening 11, or a small portion can be exposed outside the opening 11, meaning the side of the heat exchange tube 2 extends beyond the first side 16. The specific design can be preset according to actual needs, and this document does not impose any specific limitations. When the heat exchanger is working, the second side 17 (i.e., the side near the first protrusion 14) can serve as the windward side.

[0031] like Figure 6 As shown, in one specific embodiment, the heat exchange tube 2 includes a plurality of channels 21, which are arranged at intervals along the width direction of the heat exchange tube 2. The flow cross-sectional area of ​​the plurality of channels 21 decreases linearly in the direction from the second side 17 to the first side 16.

[0032] As mentioned in the previous embodiment, one side of the second side 17 serves as the windward side when the heat exchanger is operating. Because the heat exchange effect is better on the windward side, the multiple channels 21 of the heat exchange tube 2 decrease linearly from the second side 17 to the first side 16. This means that the first channel 21 of the heat exchange tube 2 closest to the second side 17 has the largest flow cross-sectional area, and the further away from the second side 17, the smaller the flow cross-sectional area of ​​the corresponding channel 21. The channel 21 with a large flow cross-sectional area can hold more refrigerant and has a better heat exchange effect. Conversely, the channel 21 with a small flow cross-sectional area can hold less refrigerant and has a relatively poorer heat exchange effect. In other words, when the airflow flows to the windward side, the temperature difference between the air and the fins 1 is higher, resulting in higher heat exchange efficiency on the air side. Consequently, the refrigerant demand on the windward side is larger, which can further enhance the heat exchange effect on the windward side. When the airflow flows to the leeward side, the temperature difference between the air and the heat exchange fins is lower, resulting in lower heat exchange efficiency on the air side. Consequently, the refrigerant demand on the leeward side is smaller, avoiding insufficient heat exchange of the refrigerant. The heat exchanger tube 2 can reasonably match the heat exchange demand of the airflow on the air inlet and air outlet sides, thus avoiding insufficient or overheating in some areas.

[0033] like Figure 7As shown, in one specific embodiment, the fin 1 further includes a plurality of second protrusions 18. The second protrusions 18 are located on the side of the first protrusion 14 facing the first groove 12. The second protrusions 18 protrude outwards on one side of the fin 1 in the thickness direction, and the outward protrusion direction of the second protrusions 18 is the same as the inward concave direction of the first groove 12. The second protrusions 18 are connected to the first groove 12. The second protrusions 18 can also disrupt the laminar boundary layer on the air side, enhance air-side turbulence, and thus enhance the heat exchange performance of the heat exchanger. In addition, the connection between the second protrusions 18 and the first groove 12 allows the condensate accumulated on the second protrusions 18 to flow directly into the first groove 12, thereby improving the drainage performance while improving the heat exchange performance of the fin 1.

[0034] like Figure 7-8 As shown, in one specific embodiment, the second protrusion 18 includes a plurality of second protrusions 181, which are arranged continuously or at intervals. Each second protrusion 181 includes a third convex surface 182 and a fourth convex surface 183. The third convex surface 182 and the fourth convex surface 183 have a preset included angle, and at least one third slit 184 is provided on the third convex surface 182 and / or the fourth convex surface 183.

[0035] In this embodiment, the third convex surface 182 and the fourth convex surface 183 make the cross-section of the second convex strip 181 triangular. After multiple second convex strips 181 are arranged continuously, the third convex surface 182 and the fourth convex surface 183 between two adjacent second convex strips 181 form a slit for condensate to flow. The condensate can flow along the slit and enter the first groove 12. Generally, the widths of the third convex surface 182 and the fourth convex surface 183 are equal, that is, the cross-section of the second convex strip 181 is an isosceles triangle. In addition, the third slit 184 provided on the third convex surface 182 and / or the fourth convex surface 183 can guide a part of the airflow to the adjacent airflow channel, that is, to make the airflow on one side of the fin 1 thickness direction flow to the other side of the fin 1 thickness direction, enhance the turbulence between the air on both sides of the fin 1, thereby improving the heat transfer performance of the fin 1.

[0036] like Figure 8 As shown, in one specific embodiment, the opening portion 11 has an annular hole wall, and the fin 1 further includes a third groove 19, which is located on the side of the opening portion 11 away from the first groove 12, and the length direction of the third groove 19 extends at least partially along the length direction of the fin 1.

[0037] In this embodiment, the opening 11 is a closed annular hole structure. When the heat exchange tube 2 is a microchannel flat tube, the opening 11 is a waist-shaped hole. The heat exchange tube 2 can be connected to the fin 1 by insertion. When the heat exchanger is working, one side of the first groove 12 and the first protrusion 13 can still serve as the windward side. This enhances heat exchange and ensures the heat exchanger's heat exchange performance while improving the drainage effect on the windward side. One side of the third groove 19 serves as the leeward side, and the condensate on the fin 1 can be discharged through the third groove 19. Of course, in this embodiment, if the fin 1 has a first groove 12 and a third groove 19 on both sides, one side of the third groove 19 can also serve as the windward side, while the first groove 12 serves as the leeward side.

[0038] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the technical solutions and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications should also fall within the protection scope of this application.

Claims

1. A heat exchanger, characterized in that, The device includes multiple fins (1) and multiple heat exchange tubes (2). The multiple fins (1) are stacked and arranged in a stacked manner. Each fin (1) has multiple openings (11) spaced apart along the length direction of the fin (1). The multiple heat exchange tubes (2) are respectively disposed within at least a portion of the openings (11). Each fin (1) includes a first groove (12) and multiple second grooves (13). The width direction of the fin (1) is defined as a first direction. The first groove (12) is located on the openings (11) along the first direction. On one side, and the length direction of the first groove (12) extends at least partially along the length direction of the fin (1), the first groove (12) is recessed in the thickness direction of the fin (1) on one side; the second groove (13) is located between two adjacent openings (11), the second groove (13) is recessed in the thickness direction of the fin (1) on one side, and the concave direction of the second groove (13) is the same as the concave direction of the first groove (12), and one end of the second groove (13) along the length direction is connected to the first groove (12).

2. The heat exchanger according to claim 1, characterized in that, The length direction of the first groove (12) extends along the length direction of the fin (1), and the length direction of the second groove (13) is inclined to the first direction. The angle between the second groove (13) and the first direction is defined as α, then: 5°≤α≤30°.

3. The heat exchanger according to claim 1 or 2, characterized in that, The fin (1) further includes a plurality of first protrusions (14), the first protrusions (14) are located between two adjacent openings (11), the first protrusions (14) protrude outward on one side of the thickness direction of the fin (1), and the outward protrusion direction of the first protrusions (14) is the same as the inward concave direction of the second groove (13), and the first protrusions (14) are connected to the second groove (13).

4. The heat exchanger according to claim 3, characterized in that, The fin (1) further includes a plurality of windows (15), the windows (15) being located between two adjacent openings (11), the windows (15) and the first protrusion (14) being arranged alternately along the first direction, or the windows (15) being located on the side of the first protrusion (14) away from the first groove (12); the windows (15) have a plurality of first slits (151), the plurality of first slits (151) being arranged at intervals along the first direction.

5. The heat exchanger according to claim 3, characterized in that, The first protrusion (14) includes a plurality of first protrusions (141), which are arranged continuously or at intervals along the first direction. One end of the first protrusion (141) along the length direction is connected to the second groove (13), and the other end along the length direction is at a predetermined distance from the opening (11).

6. The heat exchanger according to claim 5, characterized in that, Define one or more of the first protrusions (141) arranged in succession as a protrusion group (142), and arrange multiple protrusion groups (142) at intervals along the first direction. In the direction from one end of the second groove (13) connected to the first groove (12) to the other end of the second groove (13), the number of the first protrusions (141) included in the protrusion group (142) decreases linearly.

7. The heat exchanger according to claim 5, characterized in that, The angle between the first convex strip (141) and the fin (1) along the length direction is less than or equal to 30°. The first convex strip (141) includes a first convex surface (143) and a second convex surface (144). The first convex surface (143) and the second convex surface (144) have a preset angle. At least one second slit (145) is provided on the first convex surface (143) and / or the second convex surface (144).

8. The heat exchanger according to any one of claims 1-2 or 4-7, characterized in that, The fin (1) has a first side (16) and a second side (17) in the length direction. The opening (11) has a first opening (111) that penetrates the first side (16). The first groove (12) is located on the side of the opening (11) facing the second side (17).

9. The heat exchanger according to claim 8, characterized in that, The heat exchange tube (2) includes a plurality of channels (21), which are spaced apart along the width direction of the heat exchange tube (2). The flow cross-sectional area of ​​the plurality of channels (21) decreases linearly in the direction from the second side (17) to the first side (16).

10. The heat exchanger according to claim 8, characterized in that, The fin (1) further includes a plurality of second protrusions (18), the second protrusions (18) are located on the side of the first protrusion (14) facing the first groove (12), the second protrusions (18) protrude outward on one side of the thickness direction of the fin (1), and the outward protrusion direction of the second protrusions (18) is the same as the inward concave direction of the first groove (12), and the second protrusions (18) are connected to the first groove (12).

11. The heat exchanger according to claim 10, characterized in that, The second protrusion (18) includes a plurality of second protrusions (181), which are arranged continuously or at intervals. Each second protrusion (181) includes a third protrusion (182) and a fourth protrusion (183). The third protrusion (182) and the fourth protrusion (183) have a preset included angle, and at least one third slit (184) is provided on the third protrusion (182) and / or the fourth protrusion (183).

12. The heat exchanger according to any one of claims 1-2, 4-7, or 9-11, characterized in that, The opening (11) has an annular hole wall, and the fin (1) further includes a third groove (19), which is located on the side of the opening (11) away from the first groove (12), and the length direction of the third groove (19) extends at least partially along the length direction of the fin (1).

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