Heat exchange fin and heat exchanger

Abstract

The application relates to a heat exchange fin and a heat exchanger. The heat exchange fin comprises a first fin, a plurality of first protrusions being arranged at intervals in a first direction, and the distance between adjacent first protrusions located at middle positions in the first direction is smaller than the distance between adjacent first protrusions located at side edge positions; a second fin, the first fin being located at two sides of the second fin in a second direction respectively, the second fin comprising a plurality of groups of sub-fins arranged in the second direction, the sub-fins comprising a plurality of second protrusions arranged at intervals in the first direction, and the second protrusions of adjacent groups of the sub-fins being arranged in a staggered manner in the same row in the second direction; wherein the second protrusions have opposite side walls in the first direction, the side walls being inclined at a preset angle with respect to a third direction, and the first direction, the second direction and the third direction intersecting. The heat exchange fin and the heat exchanger can make fluid distribution more uniform and heat exchange effect better without damaging the overall structure of the fin, and the strength of the fin is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange equipment, and in particular to a heat exchange fin and a heat exchanger. BACKGROUND

[0002] The plate-fin heat exchanger is widely used in many industrial fields due to its compact structure, small size, high heat transfer efficiency, and strong adaptability. The plate-fin heat exchanger is generally composed of a head, a fin, a partition plate, and a sealing element, etc. The media that need to be heat exchanged are separated in different flow areas by these components, and heat transfer is carried out through the partition plate and the fin. In the current plate-fin heat exchanger, in order to ensure the heat exchange effect, the layout is generally optimized by destroying the structure of the fin, which leads to low overall structural strength of the fin, easy noise and vibration, and increased processing difficulty. SUMMARY

[0003] The purpose of the present application is to provide a heat exchange fin and a heat exchanger, which can make the fluid distribution more uniform and the heat exchange effect better without destroying the overall structure of the fin, and ensure the strength of the fin.

[0004] To this end, in a first aspect, the embodiments of the present application provide a heat exchange fin, which comprises:

[0005] A first fin comprises a plurality of first protrusions arranged at intervals in a first direction, and the distance between adjacent first protrusions located at the middle position in the first direction is smaller than the distance between adjacent first protrusions located at the two side edge positions.

[0006] A second fin, the first fin is located on both sides of the second fin in the second direction, the second fin comprises a plurality of groups of sub-fins arranged in the second direction, the sub-fin comprises a plurality of second protrusions arranged at intervals in the first direction, and the second protrusions of adjacent groups of sub-fins arranged in the same row in the second direction are staggered.

[0007] Wherein, the second protrusion has opposite side walls in the first direction, the side wall is inclined at a preset angle relative to the third direction, and the first direction, the second direction and the third direction intersect.

[0008] In a possible implementation, the distance between adjacent first protrusions gradually increases from the middle position to the two side edge positions in the first direction.

[0009] In a possible implementation, every 6-8 adjacent first protrusions are taken as a group, the distance between every two adjacent first protrusions in the same group is equal, and the distance between adjacent first protrusions gradually increases from the group located in the middle to the groups located at the two side edges in the first direction.

[0010] In a possible implementation, in each two adjacent groups, the distance between the adjacent first protrusions in different groups is different by 0.3mm-0.8mm.

[0011] In a possible implementation, in the first fin and the adjacent sub-fin, the first protrusion and the second protrusion in the same row in the second direction are staggered arranged.

[0012] The first protrusion and the second protrusion are both plate-shaped protrusion structures protruding along the third direction, so that the first protrusion is correspondingly provided with a first recess, the second protrusion is correspondingly provided with a second recess, and the first recess and the second recess are communicated.

[0013] In a possible implementation, along the second direction, the length of the first fin is greater than or equal to one-half of the length of the sub-fin.

[0014] In a possible implementation, along the third direction, the cross section of the second protrusion gradually decreases towards the direction of the bottom surface close to the sub-fin, and the inclination directions of the two side walls of the same first protrusion are opposite.

[0015] In a possible implementation, the included angle between the bottom surface of the sub-fin and the side wall is between 78°-83°.

[0016] In a possible implementation, the side wall is a plane, or the side wall is an arc surface.

[0017] In a possible implementation, a groove is formed between two adjacent second protrusions, in the third direction, the second protrusion of one of the sub-fins is opposite to the groove of the other sub-fin, and in the third direction, the second protrusion of the different sub-fin intersects in the orthographic projection of the other sub-fin.

[0018] In a possible implementation, the strength of the first fin is greater than the strength of the second fin.

[0019] In a second aspect, the embodiments of the present application further provide a heat exchanger, comprising:

[0020] A partition plate;

[0021] A heat exchange fin arranged on the partition plate, the heat exchange fin being the heat exchange fin described above;

[0022] A sealing member connected with the partition plate, the sealing member being located on both sides of the heat exchange fin in the first direction.

[0023] In a possible implementation, the limiting piece includes a first limiting part and a second limiting part, one of the first limiting part and the second limiting part is arranged on the partition plate, and the other is arranged on the sealing piece, so as to limit the relative movement of the partition plate and the sealing piece.

[0024] In a possible implementation, along the third direction, the sealing piece is provided with opposite first surfaces, the first surfaces include a plane and inclined surfaces located on both sides of the plane in the first direction, the plane is provided with the first limiting part, and the inclined surfaces are provided with sealing grooves.

[0025] According to the heat exchange fin and the heat exchanger provided in the embodiments of the present application, in the process of fluid flow, the fluid can flow to the sub-fin more uniformly due to the influence of the distance between the adjacent first protrusions arranged in the first fin, and at the same time, the side wall arranged in the second protrusion arranged in the sub-fin is in an inclined structure, so that the fluid can realize a larger contact area without increasing the resistance when the fluid exchanges heat in the sub-fin, and the heat exchange efficiency is improved. Therefore, according to the cooperation of the first fin and the second fin, the heat exchange can be more uniform by simple structure cooperation without damaging the fin structure, the heat exchange efficiency is improved, the overall structure of the heat exchanger is not affected, and the noise and vibration problems are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor. In addition, the same components are marked with the same reference numerals in the drawings, and the drawings are not drawn according to the actual proportion.

[0027] Figure 1 A structure schematic diagram of a heat exchanger provided by an embodiment of the present application is shown, wherein the direction indicated by arrow X is the first direction, the direction indicated by arrow Y is the second direction, and the direction indicated by arrow Z is the third direction.

[0028] Figure 2 A partial structure schematic diagram of Figure 1 is shown, wherein the direction indicated by arrow X is the first direction, the direction indicated by arrow Y is the second direction, and the direction indicated by arrow Z is the third direction.

[0029] Figure 3 An exploded view of Figure 2 is shown, wherein the direction indicated by arrow X is the first direction, the direction indicated by arrow Y is the second direction, and the direction indicated by arrow Z is the third direction.

[0030] Figure 4 show Figure 3 partial enlarged view of part A in the middle;

[0031] Figure 5 show a cross-sectional view of a first fin in a heat exchange fin provided by an embodiment of the application, wherein the direction indicated by arrow X is the first direction;

[0032] Figure 6 show a cross-sectional view of a sub-fin in a heat exchange fin provided by an embodiment of the application, wherein the direction indicated by arrow X is the first direction;

[0033] Figure 7 show a structural schematic view of a baffle in a heat exchanger provided by an embodiment of the application;

[0034] Figure 8 show a structural schematic view of a sealing member in a heat exchanger provided by an embodiment of the application;

[0035] Figure 9 show a cross-sectional view of a sealing member in a heat exchanger provided by an embodiment of the application.

[0036] Reference signs:

[0037] 1-heat exchange fin; 11-first fin; 111-first protrusion; 111a-first recess; 112-third recess; 12-sub-fin; 121-second protrusion; 121a-side wall; 121b-second recess; 121c-bottom surface; 121d-groove; 2-baffle; 3-sealing member; 31-flat surface; 32-inclined surface; 321-sealing groove; 4-limiting member; 41-second limiting part; 42-first limiting part. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] Figure 1 show a structural schematic view of a heat exchanger provided by an embodiment of the application. Figure 2A schematic diagram of a part of a fitting structure in a heat exchanger is shown. The direction indicated by arrow X is a first direction, the direction indicated by arrow Y is a second direction, and the direction indicated by arrow Z is a third direction. The first direction X, the first direction Y, and the third direction Z intersect, and preferably, the first direction X, the first direction Y, and the third direction Z are perpendicular to each other. Subsequent descriptions will not emphasize this again.

[0040] Referring to Figure 1 and Figure 2 , the present application provides a heat exchanger, which is a plate-fin heat exchanger and can be applied to various fields with heat exchange requirements. The heat exchanger includes a partition plate 2, a heat exchange fin 1, and a sealing member 3. The heat exchange fin 1 is arranged between two partition plates 2 in the third direction Z, and the sealing member 3 is connected to the partition plate 2. The sealing member 3 is located on both sides of the heat exchange fin 1 in the first direction X. The sealing member 3, the partition plate 2, and the heat exchange fin 1 are arranged to form a flow channel between the plate surface of the heat exchange fin 1 and the partition plate 2 for medium passing, thereby achieving heat exchange. A plurality of heat exchange fins 1 and a plurality of partition plates 2 are arranged in the third direction Z, and the arrangement directions of adjacent heat exchange fins 1 are staggered, that is, the heat exchange fins 1 in one layer are arranged in the first direction X, and the heat exchange fins 1 in the adjacent upper and lower layers are arranged in the first direction Y, so that the overall arrangement structure is more compact, the volume is smaller, the heat transfer efficiency is higher under the premise of achieving the same heat exchange effect, and detailed descriptions are not made here.

[0041] Optionally, a limiting member 4 is further included, which is used to connect the sealing member 3 and the partition plate 2 to limit the relative movement between the sealing member 3 and the partition plate 2, so as to ensure better sealing effect.

[0042] Referring to Figure 3 and Figure 4 , the present application provides a heat exchange fin for the heat exchanger described above. The heat exchange fin 1 includes a first fin 11 and a second fin. The first fin 11 includes a plurality of first protrusions 111 arranged at intervals in the first direction X, and the distance between adjacent first protrusions 111 located at the middle position in the first direction X is smaller than the distance between first protrusions 111 located at the two side edge positions. The first fin 11 is located on both sides of the second fin in the first direction Y. The second fin includes a plurality of groups of sub-fins 12 arranged in the first direction Y. The sub-fin 12 includes a plurality of second protrusions 121 arranged at intervals in the first direction X. The second protrusions 121 of adjacent groups of sub-fins 12 arranged in the same row in the first direction Y are arranged in a staggered manner. The second protrusion 121 has two opposite side walls 121a in the first direction X, and the side wall 121a is inclined at a preset angle with respect to the third direction Z.

[0043] The first fins 11 on both sides of the second fin form the inlet and outlet of the fluid medium after cooperating with the partition plate 2, and the plurality of groups of sub-fins 12 in the second fin combine with the partition plate 2 to form a flow channel. The fluid medium enters the flow channel through the inlet and is discharged from the outlet. In the process of fluid flow, the distance between the adjacent first protrusions 111 arranged in the first fin 11 affects the flow of the fluid to the sub-fin 12, so that the fluid is more uniformly distributed to the middle position of the sub-fin 12, and the side wall 121a arranged in the second protrusion 121 arranged in the sub-fin 12 is arranged in an inclined structure, so that the fluid can achieve a larger contact area when heat exchanging in the sub-fin 12 without increasing the resistance, thereby improving the heat exchange efficiency. According to the cooperation of the first fin 11 and the second fin, the heat exchange can be more uniform by simple structure cooperation without damaging the fin structure, thereby improving the heat exchange efficiency, without affecting the overall structure of the heat exchanger, and avoiding noise and vibration problems.

[0044] It can be understood that the second fin can be spliced by a plurality of groups of sub-fins 12, which will not be described in detail here.

[0045] In an optional embodiment, the distance between the adjacent first protrusions 111 gradually increases from the middle position to the edge position in the first direction X. In the first fin 11, the distance between the two or more first protrusions 111 arranged in the middle can be smaller than the distance between the other first protrusions 111, or the distance can gradually increase from the middle to the edge. The design can be adjusted according to actual needs, as long as more fluid can pass through the inlet or outlet from the edge than from the middle, so as to avoid the fluid entering the second fin from being concentrated in the middle area, which will not be specifically limited here.

[0046] Optionally, referring to Figure 5 Every 6-8 adjacent first protrusions 111 form a group, and the distance between every two adjacent first protrusions 111 in the same group is equal. The distance between the adjacent first protrusions 111 gradually increases from the group in the middle to the groups at the edges in the first direction X. The group in the middle position is the B group, and the distance between every two adjacent first protrusions 111 in the group is equal. The distance in the group is the smallest compared with the distance in the other groups. Such grouping can ensure that the fluid is more dispersed and uniformly distributed to the sub-fin 12, and is easy to process and form, thereby reducing the manufacturing cost.

[0047] It can be understood that in every two adjacent groups, the distance between the adjacent first protrusions 111 in different groups differs by 0.3-0.8 mm. The difference in distance between the adjacent groups is too large, which can cause uneven distribution of the fluid.

[0048] Optionally, the first fin 11 is in an integral flat structure before forming, and is formed by stamping to have a plurality of first protrusions 111 arranged at intervals, in which the first protrusions 111 are protruding structures on one side in the third direction Z and are recessed structures on the other side, and the third recesses 112 are formed between adjacent first protrusions 111, and the cross section of the first protrusions 111 is a rectangular structure, which will not be described in detail here.

[0049] In an optional embodiment, referring to Figure 5 and Figure 6 , the first protrusions 111 and the second protrusions 121 in the same row in the first direction Y are arranged in a staggered manner in the first fin 11 and the adjacent sub-fin 12; the first protrusions 111 and the second protrusions 121 are both plate-shaped protruding structures protruding in the third direction Z, so that the first protrusions 111 are correspondingly provided with first recesses 111a, the second protrusions 121 are correspondingly provided with second recesses 121b, and the first recesses 111a and the second recesses 121b are communicated. By providing the first recesses 111a and the second recesses 121b, the first recesses 111a and the second recesses 121b can be enclosed by the partition plate 2 to form a communicated flow channel, so that the fluid can flow from the inlet to the outlet through the sub-fins 12 in different groups, and finally be discharged to realize heat exchange.

[0050] It can be understood that the specific shape and size of the communicated first recesses 111a and second recesses 121b can be adaptively adjusted according to actual needs, which will not be specifically limited here.

[0051] Optionally, along the first direction Y, the length of the first fin 11 is greater than or equal to one-half of the length of the sub-fin 12. By limiting the length of the first fin 11 and the sub-fin 12 in the first direction Y, it is ensured that there is enough buffer distance for the fluid to flow to the corresponding position, providing a buffer for the flow of the fluid.

[0052] In an optional embodiment, referring to Figure 6 , along the third direction Z, the cross section of the second protrusion 121 gradually decreases in the direction of the bottom surface 121c close to the sub-fin 12, and the inclined directions of the two side walls 121a located in the same first protrusion 111 are opposite. As with the design of the first protrusion 111 in the first fin 11, the difference is that the side wall 121a of the second protrusion 121 is provided as an inclined surface, so that the flow channel enclosed by the inclined surface increases the contact area of the fluid, thereby improving the heat exchange efficiency.

[0053] It can be understood that the side wall 121a can also be inclined outward relative to the second protrusion 121 to form a right trapezoidal structure in the cross section, which will not be specifically limited here.

[0054] Optionally, the included angle a between the bottom surface 121c and the side wall 121a of the sub-fin 12 is between 78° and 83°. The strength and stability of the second protrusion 121 in the sub-fin 12 are ensured while the contact area is increased to improve the heat exchange efficiency.

[0055] Optionally, the side wall 121a is a plane, or the side wall 121a is an arc surface, which can be adjusted according to actual needs, and is not specifically limited here.

[0056] Optionally, for the plurality of second protrusions 121 arranged in each sub-fin 12, the distance between any adjacent second protrusions 121 in each sub-fin 12 is equal, so that the fluid can flow uniformly in the plurality of groups of sub-fins 12.

[0057] In an optional embodiment, when the adjacent sub-fins 12 are matched to form the second fin, in order to ensure that the inlet and outlet formed by the first fin 11 can be communicated, a groove 121d is formed between the two adjacent second protrusions 121, and in the third direction Z, the second protrusion 121 of one of the two adjacent sub-fins 12 is opposite to the groove 121d of the other sub-fin 12, and the second protrusion 121 of one of the two adjacent sub-fins 12 is located at the intersection of the second protrusions 121 of different sub-fins 12 in the orthographic projection of the other sub-fin 12 in the third direction Z. By setting the intersection of the second protrusions 121 in the projection direction, the intersection can form a flow channel for the fluid to pass to the next sub-fin 12. The size of the two second protrusions 121 of the adjacent sub-fins 12 overlapping in the projection direction can be adjusted according to the inclination direction and inclination angle of the side wall 121a, and is not specifically limited here.

[0058] Optionally, the first fin 11 is an integral structure, the sub-fin 12 is an integral structure, and the first fin 11 and the second fin can be made of different materials, so that the strength of the first fin 11 is greater than that of the second fin. Even when the Reynolds number is high, noise and vibration do not occur, and good use effect is ensured.

[0059] It can be understood that the first fin 11 and the plurality of sub-fins 12 are spliced to form the heat exchange fin 1, which reduces the overall processing difficulty of the fin and does not damage the fin structure, thereby ensuring high structural strength.

[0060] Referring to Figure 7 and Figure 8The heat exchanger provided by the embodiments of the present application is based on the heat exchange fins 1 in the above embodiments. In order to ensure that the heat exchanger formed by using the heat exchange fins 1 has good sealing performance and stability, the limiting member 4 in the heat exchanger includes a first limiting portion 42 and a second limiting portion 41 that are matched with each other. One of the first limiting portion 42 and the second limiting portion 41 is arranged on the partition plate 2, and the other is arranged on the sealing member 3, so as to limit the relative movement of the partition plate 2 and the sealing member 3. The position between the partition plate 2 and the sealing member 3 is fixed by the first limiting portion 42 and the second limiting portion 41, so as to ensure the processing quality and the alignment accuracy. The dislocation deviation is not prone to occur during the processing of the heat exchanger, and the processing qualified rate is increased.

[0061] Optionally, referring to Figure 9 , along the third direction Z, the sealing member 3 is provided with opposite first surfaces, the first surfaces include a plane 31 and inclined surfaces 32 located on both sides of the plane 31 in the first direction X, the plane 31 is provided with the first limiting portion 42, and the inclined surfaces 32 are provided with sealing grooves 321. The angle b at which the inclined surface 32 is inclined downward relative to the plane 31 is 8°-10°, the groove width of the sealing groove 321 is 1.8-2.2 times the groove depth, and the groove block of the sealing groove 321 is 2 mm-3 mm. It can be understood that the first limiting portion 42 located on the plane 31 can be multiple and arranged at intervals, or can be one. When the first limiting portion 42 is one, the first limiting portion 42 is located at the middle position of the sealing member 3 in the first direction X or the first direction Y, so as to ensure the stability of the connection, and a large number of limiting members 4 are not needed to ensure good results, thereby reducing the overall weight.

[0062] Optionally, the sealing member 3 and the partition plate 2 are fixedly connected by brazing, and a plurality of sealing grooves 321 can be arranged on each inclined surface 32 and arranged at intervals in the first direction X. When the sealing member 3 and the partition plate 2 are welded, the welding seam is full, the brazing strength of the sealing member 3 and the partition plate 2 is enhanced, the sealing effect is ensured, and the service life of the heat exchanger is improved.

[0063] It can be understood that, for the matched first limiting portion 42 and the second limiting portion 41, the protruding structure and the recessed structure can be arranged on the surface of the partition plate 2 and the first surface respectively. Such a matching structure is simple, and the good limiting effect is achieved while facilitating disassembly and assembly. Preferably, the protruding structure and the recessed structure are arranged as taper structures with gradually changed cross sections, and the protruding structure and the recessed structure are in interference fit, so as to ensure good stability and strength.

[0064] It should be noted that the use of "a" or "an" or "the" or similar referents in the specification are used inclusively and in the discretion of the inventor(s) to refer to both singular and plural, unless otherwise indicated herein and / or by context. The use of "first", "second", or "third" or similar referents in the specification is used inclusively and in the discretion of the inventor(s) to refer to a feature or characteristic that can be combined with another feature or characteristic, unless otherwise indicated herein and / or by context. The use of "one or more" or "at least one" or similar referents in the specification is used inclusively and in the discretion of the inventor(s) to refer to one or more or at least one, unless otherwise indicated herein and / or by context. The use of "including," "containing," or "comprising" or similar referents in the specification are used inclusively and in the discretion of the inventor(s) to refer to processes, methods, articles, or apparatuses that include a series of elements but not exclusive of other elements not specifically listed or inherent to such processes, methods, articles, or apparatuses. The use of "consisting essentially of" or "consisting of" or similar referents in the specification are used inclusively and in the discretion of the inventor(s) to refer to processes, methods, articles, or apparatuses that include a series of elements but not exclusive of other elements not specifically listed or inherent to such processes, methods, articles, or apparatuses, unless otherwise indicated herein and / or by context.

[0065] It will be readily understood that the terms "on", "above", and "over" in the present disclosure are to be interpreted in the broadest context, such that "on" means not only "directly on", but also includes the meaning of "on" with intervening features or layers therebetween, and "above" or "over" includes not only the meaning of "above" or "over", but also the meaning of "above" or "over" with no intervening features or layers therebetween (i.e., directly on).

[0066] Furthermore, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0067] It should be noted that the relational terms herein, such as "first", "second", and the like, are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a", "comprises...", or "comprising" does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat exchange fin, characterized by, The first fin comprises a plurality of first protrusions arranged at intervals in a first direction, and the distance between adjacent first protrusions located at middle positions in the first direction is smaller than the distance between adjacent first protrusions located at two side edge positions in the first direction. The second fin is located at two sides of the first fin in a second direction respectively, and the second fin comprises a plurality of groups of sub-fins arranged in the second direction, the sub-fins comprise a plurality of second protrusions arranged at intervals in the first direction, and the second protrusions of adjacent groups of the sub-fins arranged at intervals in the second direction are located in the same row. The first fin located at two sides of the second fin is used to cooperate with the partition plate to form an inlet and an outlet of fluid medium. The second protrusion has opposite side walls in the first direction, and the side walls are inclined at a preset angle with respect to a third direction, and the first direction, the second direction and the third direction intersect. The distance between adjacent first protrusions gradually increases from the middle position to the two side edge positions in the first direction.

2. The heat exchange fin according to claim 1, characterized by Every 6-8 adjacent first protrusions are taken as a group, and the distance between every two adjacent first protrusions located in the same group is equal, and the distance between adjacent first protrusions gradually increases from the group located at the middle to the groups located at the two side edges in the first direction.

3. The heat exchange fin according to claim 1, wherein In every two adjacent groups, the distance between adjacent first protrusions located in different groups is different by 0.3mm-0.8mm.

4. The heat transfer fin according to claim 3, wherein In the first fin and the adjacent sub-fins, the first protrusions and the second protrusions located in the same row in the second direction are arranged at intervals.

5. The heat transfer fin according to claim 1, wherein The first protrusions and the second protrusions are both plate-shaped protrusion structures protruding in the third direction, so that the first protrusions are correspondingly provided with first recesses, the second protrusions are correspondingly provided with second recesses, and the first recesses and the second recesses are communicated. In the second direction, the length of the first fin is greater than or equal to one half of the length of the sub-fin.

6. The heat transfer fin according to claim 1, wherein In the third direction, the cross section of the second protrusion gradually decreases towards the direction of the bottom surface of the sub-fin, and the inclination directions of the two side walls of the same first protrusion are opposite.

7. The heat transfer fin according to claim 1, wherein The included angle between the bottom surface of the sub-fin and the side wall is between 78°-83°.

8. The heat transfer fin according to claim 7, wherein The side wall is a plane, or the side wall is an arc surface.

9. The heat transfer fin according to claim 1, wherein A groove is formed between adjacent two second protrusions, and in the third direction, the second protrusions of one of the sub-fins are opposite to the grooves of the other sub-fin in the two adjacent sub-fins, and the second protrusions of the different sub-fins intersect in the orthographic projection of one of the sub-fins towards the other sub-fin in the third direction.

10. The heat transfer fin according to claim 1, wherein The strength of the first fin is greater than the strength of the second fin.

11. The heat exchange fin according to claim 1, wherein The partition plate; 12. A heat exchanger, characterized by The heat exchange fin arranged on the partition plate, the heat exchange fin being the heat exchange fin according to any one of claims 1-11; The sealing member connected with the partition plate, and the sealing member is located at two sides of the heat exchange fin in the first direction. ​ ​ 13. The heat exchanger of claim 12, wherein, Further comprising a limiting member, comprising a first limiting part and a second limiting part, one of the first limiting part and the second limiting part is arranged on the partition plate, and the other is arranged on the sealing member, so as to limit the relative movement of the partition plate and the sealing member.

14. The heat exchanger of claim 13, wherein In the third direction, the sealing member is provided with opposite first surfaces, the first surfaces comprise a plane and inclined surfaces located on both sides of the plane in the first direction, the plane is provided with the first limiting part, and the inclined surfaces are provided with sealing grooves.

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