Fin and heat exchanger

Abstract

A fin (10) and a heat exchanger (100). The fin (10) is provided with a plurality of mounting slots (11) arranged at intervals in a second direction; the fin (10) is provided with a plurality of fin bridge groups (12) arranged at intervals in the second direction; a cutting line (101) is provided between any two adjacent mounting slots (11), two sides of the cutting line (101) each being provided with at least one of the fin bridge groups (12); each fin bridge group (12) comprises a plurality of fin bridges (121) arranged at intervals in a first direction, each of the fin bridges (121) being arranged to protrude from the fin (10) in the thickness direction of the fin (10); the fin (10) is provided with a plurality of slotted windows (13) arranged at intervals, the slotted windows (13) corresponding to the fin bridges (121) on an one-to-one basis; the two sides of each fin bridge (121) along its axis are connected to edges of a slotted window (13).

Description

Fins and heat exchangers

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 202420608445.7, filed on March 27, 2024, entitled “Fins and Heat Exchangers,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of heat exchange technology, and in particular to a fin and a heat exchanger. Background Art

[0004] The heat exchange flat tubes in a heat exchanger are typically inserted into mounting holes in the fins. The fins increase the heat exchange area and enhance the heat transfer efficiency. In related technologies, the fins are equipped with bridges on either side of the mounting holes in the height direction to enhance heat transfer. During processing, the fins need to be trimmed, but the structure of the bridges is unstable during trimming, making it easy to cut the bridges, which can cause the fins to flip over. Summary of the Invention

[0005] Based on this, it is necessary to provide a fin and a heat exchanger to enhance the structural strength of the fin during assembly and reduce the occurrence of fin inversion.

[0006] A fin, wherein the fin is constructed with a plurality of spaced mounting grooves along a second direction, the mounting grooves extending along a first direction for mounting heat exchange flat tubes, and the mounting grooves penetrating along the thickness direction of the fin; along the second direction, the fin is constructed with a plurality of spaced fin bridge groups; a cutting line is provided between any two adjacent mounting grooves, and between any two adjacent mounting grooves, at least one fin bridge group is provided on each side of the cutting line; each fin bridge group includes a plurality of fin bridges spaced along the first direction, the fin bridges protruding from the fin along the thickness direction of the fin, and each fin bridge extends along the second direction; the fin is constructed with a plurality of spaced slit windows, the slit windows penetrating along the thickness direction of the fin, the slit windows corresponding one-to-one to the fin bridges, and each fin bridge is connected to the edge of the slit window along both sides of its own axis.

[0007] In one embodiment, along the second direction, between any two adjacent mounting grooves, the spacing between the adjacent fin bridge groups located on both sides of the cutting line is defined as d, and the spacing between any two adjacent mounting grooves is defined as L, d = (0.1 ~ 0.3) L.

[0008] In one embodiment, each of the fin bridges includes a first connecting segment, an intermediate segment and a second connecting segment, the intermediate segment is connected between the first connecting segment and the second connecting segment, and the intermediate segment is arranged at an angle to the first connecting segment and the second connecting segment respectively; the ends of the first connecting segment and the second connecting segment away from the intermediate segment are respectively connected to the edges of the slit window.

[0009] In one embodiment, the middle section is arranged parallel to the window, and the angle between the first connecting section and / or the second connecting section and the middle section is between 110° and 150°.

[0010] In one embodiment, along the first direction, the fin has a first side for airflow to flow in and a second side for airflow to flow out, and each of the fin bridges forms a first gap and a second gap on the first side and the second side respectively, and the cross-sectional area of ​​the first gap along the thickness direction of the fin is larger than the cross-sectional area of ​​the second gap along the thickness direction of the fin.

[0011] In one embodiment, the cross-sectional areas of the plurality of first slits and the plurality of second slits formed by the plurality of fin bridges along the thickness direction of the fin decrease sequentially from the first side to the second side.

[0012] In one embodiment, the middle section is tilted away from a side of the slit window.

[0013] In one embodiment, in each of the fin bridge groups, each of the fin bridges forms a slit corresponding to the slit window. Along the first direction, the fin has a first side for airflow inflow and a second side for airflow outflow. Along the direction from the first side to the second side, the cross-sectional area of ​​the slit in the thickness direction of the fin decreases successively.

[0014] In one embodiment, in each of the fin bridge groups, the spacing between any two adjacent fin bridges is defined as P, and the dimension of each of the fin bridges along the first direction is defined as B, and P and B are the same.

[0015] In one embodiment, between any two adjacent mounting slots, the fin bridges in any two adjacent fin bridge groups are staggered along the second direction; or, between any two adjacent mounting slots, the fin bridges in any two adjacent fin bridge groups are aligned one by one along the second direction.

[0016] In one embodiment, along the first direction, the fin has a first side for airflow to flow in and a second side for airflow to flow out. In each of the fin bridge groups, the spacing between any two adjacent fin bridges is defined as P, and P gradually increases along the first direction and from the first side toward the second side.

[0017] In one embodiment, along the first direction, the fin has a first side for airflow to flow in and a second side for airflow to flow out. In each of the fin bridge groups, the size of each fin bridge along the first direction is defined as B, and B gradually decreases along the first direction and from the first side toward the second side.

[0018] In one embodiment, along the first direction, the fin has a first side for airflow to flow in and a second side for airflow to flow out. On the second side, the fin is constructed with a drainage structure, and the drainage structure forms a drainage groove extending along the second direction.

[0019] In one embodiment, the fin is bent along the first direction at a side away from the installation groove to form the corrugated drainage structure, and a drainage groove is formed between two adjacent wave crests.

[0020] In one embodiment, the volumes of the plurality of drainage grooves increase sequentially along a direction from the first side to the second side.

[0021] The present application also provides a heat exchanger, comprising a heat exchange flat tube and the above-mentioned fins; the heat exchange flat tube is passed through and connected to the mounting groove of the fin, and along the radial direction of the heat exchange flat tube, a plurality of the fins are arranged opposite to and spaced apart from each other on the heat exchange flat tube.

[0022] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to better describe and illustrate the embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered to limit the scope of the disclosed inventions, the presently described embodiments and / or examples, and any of the best modes currently understood for these inventions.

[0024] FIG1 is a schematic structural diagram of a fin in an embodiment provided in the present application.

[0025] FIG2 is a front view of a fin in an embodiment provided in the present application.

[0026] FIG3 is a front view of a fin in an embodiment provided in the present application.

[0027] FIG4 is a front view of a fin in an embodiment provided in the present application.

[0028] FIG5 is a front view of a fin in an embodiment provided in the present application.

[0029] FIG6 is a front view of a fin in an embodiment provided in the present application.

[0030] FIG7 is a front view of a fin in an embodiment provided in the present application.

[0031] FIG8 is a schematic diagram of a partial structure of a fin in an embodiment provided in the present application.

[0032] FIG9 is a schematic structural diagram of a heat exchanger in an embodiment provided in the present application.

[0033] Figure numerals: 10, fin; 101, cutting line; 11, mounting groove; 12, fin bridge group; 121, fin bridge; 1211, first connecting section; 1212, second connecting section; 1213, middle section; 1214, first gap; 1215, second gap; 13, slit window; 14, drainage structure; 141, drainage groove; 100, heat exchanger; 20, heat exchange flat tube. DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0035] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0037] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0039] Referring to Figures 1 to 7, the present application provides a fin 10, which is configured with a plurality of spaced mounting grooves 11 along the second direction. The mounting grooves 11 extend along the first direction and are used to mount the heat exchange flat tubes 20. The mounting grooves 11 are arranged through the thickness direction of the fin 10; along the second direction, the fin 10 is configured with a plurality of spaced fin bridge groups 12; a cutting line 101 is provided between any two adjacent mounting grooves 11, and between any two adjacent mounting grooves 11, a cutting line 101 is provided on both sides of the cutting line 101. At least one fin bridge group 12 is provided; each fin bridge group 12 includes a plurality of fin bridges 121 arranged at intervals along a first direction, the fin bridges 121 are protruded from the fin 10 along the thickness direction of the fin 10, and each fin bridge 121 extends along a second direction; the fin 10 is constructed with a plurality of slit windows 13 arranged at intervals, the slit windows 13 are arranged through along the thickness direction of the fin 10, the slit windows 13 correspond one-to-one to the fin bridges 121, and each fin bridge 121 is connected to the edge of the slit window 13 along both sides of its own axis.

[0040] It should be noted that, in this application, the projection of the fin 10 along its thickness direction is a rectangle, and the length direction of the fin 10 is defined as the second direction, and the width direction of the fin 10 is defined as the first direction. The first direction is the x-axis, and the second direction is the y-axis.

[0041] In this way, the multiple fin bridges 121 in the fin bridge assembly 12 can disturb the airflow, causing the airflow velocity and direction to change, thereby breaking the boundary layer of the gas flow and enhancing the heat exchange effect between the airflow and the fins 10. At the same time, the provision of the fin bridges 121 also increases the contact area between the fins 10 and the airflow, further enhancing the heat exchange effect. The fin bridges 121 are arranged in correspondence with the slit windows 13. The provision of the slit windows 13 can connect the airflow on both sides of the fin 10 along its own thickness direction, thereby further enhancing the disturbance effect.

[0042] Since the fins 10 need to be cut to the length required by the working conditions during the production process, the cutting lines 101 can be pre-marked according to the required length. The fin bridge groups 12 are arranged on both sides of the cutting line 101 to avoid cutting, which is beneficial to protecting the structural integrity of the fin bridge groups 12. The fins 10 still have a high structural strength after cutting, and prevent the fins 10 from being easily knocked over by external forces during assembly due to the cutting of the fin bridge groups 12, which is beneficial to improving assembly efficiency.

[0043] As shown in FIG2 , in a further embodiment, along the second direction, between any two adjacent mounting slots 11, the spacing between two adjacent fin bridge groups 12 located on both sides of the cutting line 101 is defined as d, and the spacing between any two adjacent mounting slots 11 is defined as L, where d = (0.1-0.3) L. This allows for sufficient cutting space, facilitates protecting the structure of adjacent fin bridge groups 12 during cutting, and further ensures the structural stability of the fin 10 after cutting. For example, d = 0.1 L, 0.2 L, or 0.3 L.

[0044] As shown in Figures 2 to 7, in a specific embodiment, each fin bridge 121 includes a first connecting section 1211, an intermediate section 1213, and a second connecting section 1212. The intermediate section 1213 is connected between the first connecting section 1211 and the second connecting section 1212, and is arranged at an angle to the first connecting section 1211 and the second connecting section 1212. The ends of the first connecting section 1211 and the second connecting section 1212 away from the intermediate section 1213 are respectively connected to the edges of the slit window 13. This arrangement has a simple structure and is easy to produce and process.

[0045] In a specific embodiment, the middle section 1213 is arranged parallel to the slit window 13, and the angle between the first connecting section 1211 and / or the second connecting section 1212 and the middle section 1213 is between 110° and 150°. With this arrangement, the first connecting section 1211 and / or the second connecting section 1212 are inclined relative to the middle section 1213 and the slit window 13, and further inclined relative to the thickness direction of the fin 10. When subjected to forces along the thickness direction of the fin 10, the first connecting section 1211 and / or the second connecting section 1212 can disperse stress, thereby protecting the structure of the fin bridge 121, enhancing the overall strength of the fin 10, and enabling the fin 10 to withstand greater forces. Exemplarily, the angle between the first connecting section 1211 and / or the second connecting section 1212 and the middle section 1213 is 110°, 120°, or 150°.

[0046] Referring to FIG. 1 , in one embodiment, along a first direction, the fin 10 has a first side α for airflow inflow and a second side β for airflow outflow. Each fin bridge 121 forms a first slit 1214 and a second slit 1215 on the first side α and the second side β, respectively. The cross-sectional area of ​​the first slit 1214 along the thickness of the fin 10 is greater than the cross-sectional area of ​​the second slit 1215 along the thickness of the fin 10. This effectively overcomes the flow resistance of gas flowing through the fin bridge 121, balances the flow rate of gas flowing through the fin bridge 121, and increases heat exchange.

[0047] In one embodiment, the cross-sectional areas of the first slits 1214 and the second slits 1215 formed by the plurality of fin bridges 121 along the thickness direction of the fin 10 decrease sequentially from the first side α to the second side β. This allows for more stable and smooth airflow, further ensuring the structural stability of the fin bridge assembly 12.

[0048] In one embodiment, the middle section 1213 is tilted away from the side of the slit window 13. Specifically, it is tilted from the first side α to the second side β, that is, the cross-sectional area of ​​the middle section 1213 gradually decreases from the first side α to the second side β.

[0049] In one embodiment, in each fin bridge group 12, each fin bridge 121 corresponds to the slit window 13 to form a slit. Along the first direction, the fin 10 has a first side α for airflow to flow in and a second side β for airflow to flow out. Along the direction from the first side α to the second side β, the cross-sectional area of ​​the slit in the thickness direction of the fin 10 decreases successively.

[0050] With such a configuration, the gaps provided in the fin bridges 121 of each fin bridge assembly 12 can help overcome gas resistance and improve the uniformity of the overall airflow volume and flow velocity.

[0051] As shown in Figure 2, in some embodiments, within each fin bridge assembly 12, the spacing between any two adjacent fin bridges 121 is defined as P, and the dimension of each fin bridge 121 along the first direction is defined as B. P and B are equal, i.e., P = B. This arrangement facilitates direct dimension determination during processing, simplifies operation, and improves production efficiency. During heat exchange with the fins 10, the airflow experiences a disturbance of a range of B for each interval of distance P. Since P = B, the fin bridges 121 at all locations have the same disturbing effect on the airflow.

[0052] As shown in Figures 3, 6, and 7, in other embodiments, in each fin bridge assembly 12, the spacing P between any two adjacent fin bridges 121 is different from the dimension B of each fin bridge 121 along the first direction. If P>B, the airflow can be buffered for a longer distance after being disturbed by the fin bridge 121. When the airflow gradually stabilizes, it is disturbed by another fin bridge 121. On the basis of ensuring heat exchange efficiency, the number of fin bridges 121 can be reduced, thereby reducing production costs. If P<B, the number of fin bridges 121 in each fin bridge assembly 12 is large, the airflow buffering distance is short, and the airflow can be disturbed frequently. Alternatively, if P<B, the number of fin bridges 121 in each fin bridge assembly 12 remains unchanged, but the dimension along the first direction is larger, the obstruction to the airflow is correspondingly increased, and the airflow disturbance effect can be enhanced.

[0053] As shown in Figures 1, 2, 3, 6 and 7, in some embodiments, between any two adjacent mounting slots 11, the fin bridges 121 in any two adjacent fin bridge groups 12 are aligned one by one along the second direction, so that the two adjacent fin bridge groups 12 have the same disturbing effect on the airflow, which is conducive to ensuring the heat exchange effect of the airflow.

[0054] As shown in Figures 4 and 5, in other embodiments, between any two adjacent mounting slots 11, the fin bridges 121 in any two adjacent fin bridge groups 12 are staggered along the second direction. That is, at any position, the number of fin bridges 121 along the second direction is reduced. Since condensed water flows from high to low along the surface of the fin 10 along the second direction, this arrangement can reduce the obstruction to the flow of condensed water, thereby promoting the discharge of condensed water. In a specific embodiment, among any two adjacent fin bridge groups 12, the fin bridge 121 in one fin bridge group 12 is the first fin bridge, and the fin bridge 121 in the other fin bridge group 12 is the second fin bridge. Along the first direction, any two adjacent first fin bridges are separated by a second fin bridge.

[0055] As shown in Figures 1 to 8, in some embodiments, along the first direction, the fin 10 has a first side α for airflow to flow in and a second side β for airflow to flow out. The fin 10 is constructed with a drainage structure 14 on the second side β, which is beneficial to enhancing the structural strength of the fin 10. At the same time, the airflow can blow the condensed water on the surface of the fin 10 into the drainage structure 14. The drainage structure 14 forms a drainage groove 141 extending along the second direction. The drainage structure 14 can guide the condensed water to flow in the drainage groove 141, thereby promoting the rapid discharge of the condensed water.

[0056] In a specific embodiment, the fin 10 is bent into a corrugated shape along the first direction away from the mounting groove 11. This corrugated bending forms the drainage structure 14, which is easy to process. The space formed by the bending serves as the drainage groove 141, which facilitates the collection and drainage of condensed water. In other words, the fin 10 is bent along the first direction away from the mounting groove 11 to form the corrugated drainage structure 14, with a drainage groove 141 formed between two adjacent wave crests.

[0057] 8 , further, along the direction from the first side α to the second side β, the volumes of the plurality of drainage grooves 141 increase sequentially.

[0058] Furthermore, the multiple drainage grooves 141 have a smooth transition between them, with the volume of adjacent drainage grooves 141 gradually increasing. In other words, the volume of each drainage groove 141 gradually increases from the windward side to the leeward side of the drainage structure 14. This further facilitates the gradual accumulation and drainage of condensed water, facilitating its flow from the first side α to the second side β.

[0059] As shown in FIG6 , in some embodiments, in each fin bridge group 12, the spacing between any two adjacent fin bridges 121 is defined as P, and P gradually increases along the first direction and from the first side α toward the second side β. In this way, the spacing between the two adjacent fin bridges 121 near the first side α is larger, and the spacing between the two adjacent fin bridges 121 near the second side β is smaller. In the process of airflow blowing from the first side α to the second side β, the speed of the airflow near the first side α is faster, and it is not easy to form a boundary layer on the surface of the fin 10. Therefore, there is no need to frequently disturb the airflow so that the airflow continues to flow to the second side β. As the airflow flows, the airflow speed gradually decreases, and the airflow activity is not intense enough. Therefore, at this time, the fin bridge 121 near the second side β can frequently disturb the airflow to enhance the disturbance effect on the airflow and promote heat exchange.

[0060] As shown in FIG7 , in other embodiments, in each fin bridge assembly 12 , the dimension of each fin bridge 121 along the first direction is defined as B, where B gradually decreases along the first direction from the first side α toward the second side β. Thus, the fin bridges 121 near the first side α have a larger dimension along the first direction and present greater obstruction to airflow, while the fin bridges 121 near the second side β have a smaller dimension along the first direction and present correspondingly less obstruction to airflow. As airflow flows from the first side α to the second side β, the airflow is faster near the first side α, providing sufficient momentum to flow around the larger fin bridges 121. However, as the airflow flows, the kinetic energy gradually decreases, resulting in a slower airflow near the second side β. Therefore, smaller fin bridges 121 are provided to facilitate smooth airflow, effectively balancing gas flow rates and increasing the stability of the fin bridge assembly structure.

[0061] Referring to FIG. 9 , the present application further provides a heat exchanger 100 comprising the aforementioned fins 10 and flat heat exchange tubes 20. The flat heat exchange tubes 20 are positioned within mounting slots 11 and connected to the fins 10. Along the radial direction of the flat heat exchange tubes 20, two fins 10 are positioned opposite and connected to each other, spaced apart from the flat heat exchange tubes 20. In this manner, a heat exchange medium, such as a refrigerant, flows through the flat heat exchange tubes 20. The heat exchange medium exchanges heat with the external airflow through the flat heat exchange tubes 20 and the fins 10. By employing the aforementioned fins 10, the fins 10 are less likely to fall over after cutting and assembly, providing sufficient structural strength and improving the overall performance of the heat exchanger 100.

[0062] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A fin, characterized in that: The fin is configured with a plurality of installation grooves arranged at intervals along the second direction. The installation grooves are extended along the first direction and are used to install the heat exchange flat tubes. The installation grooves are arranged through the thickness direction of the fin. Along the second direction, the fin structure has a plurality of fin bridge groups arranged at intervals; a cutting line is provided between any two adjacent mounting grooves, and between any two adjacent mounting grooves, at least one fin bridge group is provided on each side of the cutting line; each fin bridge group includes a plurality of fin bridges arranged at intervals along the first direction, the fin bridges protruding from the fin along the thickness direction of the fin, and each fin bridge extends along the second direction; The fin structure has a plurality of slit windows arranged at intervals, and the slit windows are arranged through the thickness direction of the fin. The slit windows correspond to the fin bridges one by one, and each fin bridge is connected to the edge of the slit window along both sides of its own axis.

2. The fin according to claim 1, wherein Along the second direction, between any two adjacent mounting grooves, the spacing between two adjacent fin bridge groups located on both sides of the cutting line is defined as d, and the spacing between any two adjacent mounting grooves is defined as L, d=(0.1~0.3)L.

3. The fin according to claim 1, wherein Each of the fin bridges includes a first connecting segment, an intermediate segment and a second connecting segment, wherein the intermediate segment is connected between the first connecting segment and the second connecting segment, and the intermediate segment is arranged at an angle to the first connecting segment and the second connecting segment respectively; the ends of the first connecting segment and the second connecting segment away from the intermediate segment are respectively connected to the edges of the slit window.

4. The fin according to claim 3, wherein: The middle section is arranged parallel to the slit window, and the angle between the first connecting section and / or the second connecting section and the middle section is between 110° and 150°.

5. The fin according to claim 1, wherein Along the first direction, the fin has a first side for airflow to flow in and a second side for airflow to flow out, and each of the fin bridges forms a first gap and a second gap on the first side and the second side respectively, and the cross-sectional area of ​​the first gap along the thickness direction of the fin is larger than the cross-sectional area of ​​the second gap along the thickness direction of the fin. The fin according to claim 5 , wherein: The cross-sectional areas of the plurality of first slits and the plurality of second slits formed by the plurality of fin bridges along the fin thickness direction decrease sequentially from the first side to the second side.

7. The fin according to claim 3, wherein: The middle section is arranged obliquely on a side away from the slit window.

8. The fin according to claim 1, wherein In each of the fin bridge groups, each of the fin bridges forms a slit corresponding to the slit window. Along the first direction, the fin has a first side for airflow inflow and a second side for airflow outflow. Along the direction from the first side to the second side, the cross-sectional area of ​​the slit in the thickness direction of the fin decreases successively.

9. The fin according to claim 1, wherein In each of the fin bridge groups, the spacing between any two adjacent fin bridges is defined as P, and the dimension of each of the fin bridges along the first direction is defined as B, where P and B are the same.

10. The fin according to claim 1, wherein Between any two adjacent mounting slots, the fin bridges in any two adjacent fin bridge groups are staggered along the second direction; or, between any two adjacent mounting slots, the fin bridges in any two adjacent fin bridge groups are aligned one by one along the second direction.

11. The fin according to claim 10, wherein: The fin bridges in one of any two adjacent fin bridge groups are first fin bridges, and the fin bridges in the other fin bridge group are second fin bridges; Along the first direction, a second fin bridge is provided between any two adjacent first fin bridges.

12. The fin according to claim 1, wherein Along the first direction, the fin has a first side for airflow to flow in and a second side for airflow to flow out. In each of the fin bridge groups, the distance between any two adjacent fin bridges is defined as P, and P gradually increases along the first direction and from the first side toward the second side.

13. The fin according to any one of claims 1 to 12, characterized in that: Along the first direction, the fin has a first side for airflow to flow in and a second side for airflow to flow out. In each of the fin bridge groups, the size of each fin bridge along the first direction is defined as B, and B gradually decreases along the first direction and from the first side toward the second side.

14. The fin according to claim 1, wherein Along the first direction, the fin has a first side for airflow to flow in and a second side for airflow to flow out. On the second side, the fin is configured with a drainage structure, which forms a drainage groove extending along the second direction.

15. The fin according to claim 14, wherein The fin is bent along the first direction at a side away from the installation groove to form the corrugated drainage structure, and a drainage groove is formed between two adjacent wave peaks.

16. The fin according to claim 15, wherein The volumes of the plurality of drainage grooves increase sequentially along a direction from the first side to the second side.

17. A heat exchanger, characterized in that: It comprises a heat exchange flat tube and the fin according to any one of claims 1 to 16; the heat exchange flat tube is passed through and connected to the mounting groove of the fin, and along the radial direction of the heat exchange flat tube, a plurality of fins are arranged opposite to and spaced apart from each other on the heat exchange flat tube.

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