Fin and heat exchange device with same

Abstract

The invention provides a fin and a heat exchange device with the same, the fin comprises a fin body, the fin body is provided with a mounting part and a flow guide plate which are connected with each other, the mounting part is used for being mounted on a to-be-connected structure, the flow guide plate is provided with a hollow part, and the hollow part extends in a first preset direction; the bridge piece extends in the first preset direction, the two ends of the bridge piece are connected with the flow guide plates, the bridge piece is installed at the hollowed-out part, and at least part of the bridge piece and the hollowed-out part are arranged in a spaced mode to form a flow guide gap; at least part of the edge of the side, close to the installation part, of the bridge piece is in a first concave-convex shape. By means of the technical scheme, the technical problem that in the prior art, when fluid flows through the fins, the heat exchange efficiency is poor can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fins, and in particular to a fin and a heat exchange device having the same. Background Art

[0002] At present, in the prior art, fins are usually arranged on the heat exchange device to increase the heat exchange area, thereby better improving the heat exchange effect of the heat exchange device. In order to improve the working performance of the fins and enhance the heat exchange, bridge pieces protruding from the fin body are usually arranged on the fins to increase the heat exchange effect. In this way, when the viscous fluid passes over the fin surface, a flow boundary layer with a large velocity gradient will be formed in the windward section of the fin along the wind inlet direction. As the flow length increases, the boundary layer thickness continues to increase and hinders heat transfer.

[0003] However, although the average heat transfer coefficient of the bridge-fin structure is higher than that of the flat fin of the same length, there is still a flow boundary layer at the windward end of the bridge and the windward end of the fin body. In this way, the fins in the boundary layer can only exchange heat with the fluid through heat conduction, thereby increasing the resistance of the fluid when flowing through the fins and affecting the heat exchange efficiency. Summary of the invention

[0004] The main purpose of the present invention is to provide a fin and a heat exchange device having the same, so as to solve the technical problem of poor heat exchange efficiency when a fluid flows through the fin in the prior art.

[0005] In order to achieve the above object, according to one aspect of the present invention, a fin is provided, comprising:

[0006] The fin body comprises a mounting portion and a guide plate which are connected to each other, the mounting portion is used to be mounted on the structure to be connected, and the guide plate is provided with a hollow portion, which extends along a first preset direction;

[0007] A bridge piece extending along a first preset direction, both ends of the bridge piece are connected to the guide plate, the bridge piece is installed at the hollow portion, and at least a portion of the bridge piece is spaced from the hollow portion to form a guide gap;

[0008] Wherein, at least a portion of an edge of a side of the bridge piece close to the mounting portion is in a first concave-convex shape.

[0009] Further, at least a portion of an edge of the bridge piece on a side away from the mounting portion is in a second concave-convex shape.

[0010] Further, the first concavo-convex shape is adaptively arranged with the second concavo-convex shape, the convex part of the first concavo-convex shape is arranged correspondingly with the convex part of the second concavo-convex shape, and the concave part of the first concavo-convex shape is arranged correspondingly with the concave part of the second concavo-convex shape.

[0011] Furthermore, both sides of the bridge sheet are provided with flow-guiding protrusions;

[0012] The width of the guide protrusion is T uw , 2mm≤T uw ≤5mm; and / or,

[0013] The height of the guide protrusion is T uh , 0.5mm≤T uh ≤1.5mm; and / or,

[0014] The flow-guiding protrusion is a triangular structure, and the flow-guiding vertex angle of the flow-guiding protrusion is α, 90°≤α≤150°.

[0015] Furthermore, there are multiple hollow parts, and the multiple hollow parts are arranged on the guide plate at intervals along the second preset direction of the guide plate, and the second preset direction is arranged at a preset angle with the first preset direction; there are multiple bridge pieces, and the multiple bridge pieces are arranged one by one with the multiple hollow parts, and each bridge piece is arranged at the corresponding hollow part; the spacing between two adjacent hollow parts is Q int , the distance between the first concavo-convex shape and the second concavo-convex shape is W f ;

[0016] Among them, 1.0mm≤Q int ≤1.5mm; and / or,

[0017] and / or,

[0018] 1mm≤W f ≤2mm.

[0019] Furthermore, the width of the guide plate is F wp , the length of the hollow part is L s ,

[0020] Furthermore, the width of the guide plate is F wp , the length of the hollow part is L s , 0.6mm≤(F wp -L s ) / 2≤1.5mm.

[0021] Furthermore, the length of the hollow portion is L s ,

[0022] Furthermore, the bridge piece includes a first support piece, a guide piece, and a second support piece connected in sequence, one end of the first support piece away from the guide piece is connected to one end of the hollow portion, and one end of the second support piece away from the guide piece is connected to the other end of the hollow portion;

[0023] Wherein, the distance between the guide vane and the guide plate is H, 0.6mm≤H≤0.8mm; and / or,

[0024] There is a first preset angle β between the first support plate and the guide plate, 25°≤β≤30°; and / or,

[0025] A second preset angle γ is formed between the second support plate and the guide plate, and the angle is 25°≤γ≤30°.

[0026] Furthermore, there are multiple bridge pieces, and at least two of the multiple bridge pieces have different sizes of guide gaps from the hollow portion; and / or, the first concave-convex shape is a sawtooth structure.

[0027] According to another aspect of the present invention, there is provided a heat exchange device, comprising:

[0028] The fins and the heat exchange flat tubes are installed on the heat exchange flat tubes.

[0029] By applying the technical solution of the present invention, a bridge piece and a hollow portion are arranged on the guide plate of the fin, and a first concave-convex shape is arranged on the side of the bridge piece close to the mounting portion. In this way, the first concave-convex shape can act on the fluid so that the fluid forms a vortex at the first concave-convex shape, thereby destroying the flow boundary layer, thereby improving the heat exchange efficiency of the fin, and solving the technical problem of poor heat exchange efficiency when the fluid flows through the fin in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 A schematic structural diagram of a fin provided according to an embodiment of the present invention is shown;

[0032] Figure 2 A schematic structural diagram of a fin provided in an embodiment of the present invention at another viewing angle is shown;

[0033] Figure 3 It shows a schematic structural diagram of a bridge sheet provided according to an embodiment of the present invention;

[0034] Figure 4 A partial structural schematic diagram of a bridge sheet provided according to an embodiment of the present invention is shown;

[0035] Figure 5 A schematic structural diagram of a bridge sheet provided according to an embodiment of the present invention at another viewing angle is shown.

[0036] The above drawings include the following reference numerals:

[0037] 10. fin body; 11. mounting portion; 12. guide plate; 121. hollow portion;

[0038] 20. Bridge piece; 21. First concavo-convex shape; 22. Second concavo-convex shape; 23. Guide protrusion; 24. First support piece; 25. Guide piece; 26. Second support piece. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] Please refer to Figures 1 to 5 In the first embodiment of the present invention, a fin is provided, and the fin includes a fin body 10 and a bridge piece 20. The fin body 10 has a mounting portion 11 and a guide plate 12 connected to each other, the mounting portion 11 is used to be mounted on the structure to be connected, and the guide plate 12 is provided with a hollow portion 121, and the hollow portion 121 extends along a first preset direction. The bridge piece 20 extends along the first preset direction, and both ends of the bridge piece 20 are connected to the guide plate 12. The bridge piece 20 is installed at the hollow portion 121, and at least a portion of the bridge piece 20 is spaced from the hollow portion 121 to form a guide gap. Among them, at least a portion of the edge of the bridge piece 20 on one side close to the mounting portion 11 is a first concave-convex shape 21.

[0041] It should be noted that, in the present embodiment, the air inlet direction is the direction from the guide plate 12 to the mounting portion 11 , and the air inlet direction is perpendicular to the first preset direction.

[0042] With such a configuration, when the fluid flows through the fin body 10, it will pass through the mounting portion 11 and the guide plate 12 in sequence. Since the edge of the bridge piece 20 close to the mounting portion 11 is provided with a sawtooth-shaped first concave-convex shape 21 along the first preset direction, when the fluid reaches the first concave-convex shape 21, it will impact the first concave-convex shape 21, and the first concave-convex shape 21 will also form a certain reaction to the fluid. When the fluid contacts the top of the first concave-convex shape 21, since the first concave-convex shape 21 is more prominent than other positions of the bridge piece 20, the fluid will produce stress concentration at the top of the first concave-convex shape 21 and reduce the flow velocity to nearly zero. However, since the flow velocity of the fluid in other parts is relatively large and it will flow to the position where the flow velocity is zero under the action of the flow velocity difference, a vortex will be formed at the first concave-convex shape 21, and the formation of the vortex will thin and destroy the already formed fluid boundary layer. This will reduce the shielding of the fin body 10 by the fluid boundary layer, increase the temperature gradient and enable the fluid to better exchange heat with the fin body 10, thereby improving the heat exchange performance of the fin and solving the technical problem of poor heat exchange efficiency when the fluid flows through the fin in the prior art.

[0043] The first concavoconvex shape 21 can be set as a sawtooth structure, or any structure that can cause local stress concentration in the fluid. The sawtooth structure is specifically a triangular structure, which can generate a three-dimensional vortex cyclone, thereby having a stronger turbulence effect.

[0044] In actual operation, the hollow portion 121 can destroy the boundary layer of the fluid, increase the turbulence, thereby improving the surface heat transfer coefficient and achieving the purpose of enhancing heat transfer. Combined with the sawtooth structure, the cyclone generated by the triangular structure can achieve a mixing effect, thereby better improving the turbulence effect.

[0045] In this embodiment, at least part of the edge of the bridge piece 20 away from the mounting portion 11 is a second concave-convex shape 22. The second concave-convex shape 22 can also be set as a serrated structure. With such a setting, the windward side and the leeward side of the bridge piece 20 can both produce a disturbing effect on the fluid under the joint action of the first concave-convex shape 21 and the second concave-convex shape 22. The setting of the second concave-convex shape 22 can cause the fluid to generate eddy currents again when the fluid is about to flow out of the range of the bridge piece 20, so that the fluid on the leeward side of the bridge piece 20 can better contact the bridge piece 20, thereby further improving the heat exchange efficiency of the fin.

[0046] Specifically, the first concavoconvex shape 21 and the second concavoconvex shape 22 are configured to match each other, the convex part of the first concavoconvex shape 21 is configured to correspond to the convex part of the second concavoconvex shape 22, and the concave part of the first concavoconvex shape 21 is configured to correspond to the concave part of the second concavoconvex shape 22. With such a configuration, since the convex part of the first concavoconvex shape 21 and the convex part of the second concavoconvex shape 22 are configured to correspond, the fluid can be better guided and flow out of the bridge piece 20 after passing through the first concavoconvex shape 21 and reaching the second concavoconvex shape 22, and the situation that the resistance to the fluid increases and the flow of the fluid is affected due to the non-corresponding configuration of the first concavoconvex shape 21 and the second concavoconvex shape 22 can be avoided, and the disturbance effect of the bridge piece 20 on the fluid can be further improved.

[0047] In this embodiment, the bridge piece 20 has flow-guiding protrusions 23 on both sides. It should be noted that the flow-guiding protrusions 23 on both sides of the bridge piece 20 are provided in plurality, and a plurality of flow-guiding protrusions 23 close to the mounting portion 11 are connected to form a first concave-convex shape 21, and a plurality of flow-guiding protrusions 23 away from the mounting portion 11 are connected to form a second concave-convex shape 22, so that the fluid can be acted on by a plurality of small units of the flow-guiding protrusions 23, thereby enhancing the influence of the first concave-convex shape 21 and the second concave-convex shape 22 on the fluid.

[0048] The width of the guide protrusion 23 is T uw , 2mm≤T uw≤5mm. With such a setting, the area of ​​the guide protrusion 23 that is too wide is also large, so that the guide protrusion 23 will be raised slowly, and the disturbance effect on the fluid will be reduced when the fluid impacts; at the same time, the guide protrusion 23 that is too narrow will make the multiple guide protrusions 23 arranged too densely, and the overly dense guide protrusions 23 will cause the fluids between the guide protrusions 23 to affect each other, and the first concavo-convex shape 21 and the second concavo-convex shape 22 will have a negative impact on the fluid. Limiting the width of the guide protrusion 23 within a reasonable width range can ensure the disturbance ability of the guide protrusion 23 on the fluid.

[0049] Alternatively, the height of the guide protrusion 23 is T uh , 0.5mm≤T uh ≤1.5mm. With such a setting, if the height of the guide protrusion 23 is too low, the fluctuation of the first concavo-convex shape 21 and the second concavo-convex shape 22 will be relatively gentle, which will reduce the disturbance effect of the first concavo-convex shape 21 and the second concavo-convex shape 22 on the fluid; if the height of the guide protrusion 23 is too high, the length of the guide protrusion 23 will be increased, which will form a flow boundary layer on the guide protrusion 23 and lose the design significance of the guide protrusion 23; limiting the height of the guide protrusion 23 within a reasonable width range can ensure that the guide protrusion 23 disturbs the fluid more efficiently. Specifically, the height T of the guide protrusion 23 uh Generally limited to 1mm.

[0050] Alternatively, the flow-guiding protrusion 23 is a triangular structure, and the flow-guiding vertex angle of the flow-guiding protrusion 23 is α, 90°≤α≤150°. With such a setting, a sawtooth structure of the first concave-convex shape 21 and the second concave-convex shape 22 can be formed by connecting multiple flow-guiding protrusions 23 of a triangular structure. The triangular structure can ensure that the outermost end of the bridge sheet 20 has multiple flow-guiding vertex angles. The triangular structure with a flow-guiding vertex angle can more effectively cause the fluid to produce stress concentration phenomenon through the flow-guiding vertex angle than other structures, and can better affect the fluid than the boss or other structures. In order to ensure that the flow-guiding vertex angle can have the ability to disturb the fluid, it is necessary to ensure that the flow-guiding vertex angle will not make the first concave-convex shape 21 and the second concave-convex shape 22 too flat due to an excessively large angle, and will not make the sawtooth structure of the first concave-convex shape 21 and the second concave-convex shape 22 too dense due to a too small flow-guiding vertex angle, which will have a negative impact on the fluid. Such an angle restriction can ensure that the flow-guiding protrusion 23 with a triangular structure of a flow-guiding vertex angle can effectively cause the fluid to produce vortices.

[0051] Alternatively, the width of the guide protrusion 23 can be set to T uw , T uhThe diversion vertex angle α of the triangular structure of the diversion protrusion 23 satisfies the above setting. With such a setting, it can be further ensured that the diversion protrusion 23 can effectively generate vortex in the fluid. Preferably, the diversion protrusion 23 can be set as an isosceles triangle.

[0052] In this embodiment, there are multiple hollow portions 121, and the multiple hollow portions 121 are arranged on the guide plate 12 at intervals along the second preset direction of the guide plate 12, and the second preset direction is arranged at a preset angle with the first preset direction; there are multiple bridge pieces 20, and the multiple bridge pieces 20 are arranged one by one with the multiple hollow portions 121, and each bridge piece 20 is arranged at the corresponding hollow portion 121; the spacing between two adjacent hollow portions 121 is Q int , the distance between the first concavo-convex shape 21 and the second concavo-convex shape 22 is W f With such a configuration, the cooperation of the plurality of hollow portions 121 and the plurality of bridge pieces 20 can further create a disturbance effect on the fluid.

[0053] Among them, 1.0mm≤Q int Such a configuration can avoid the situation where two adjacent hollow portions 121 are too close to each other, which may cause turbulence under the action of the adjacent first concavo-convex shape 21 and the second concavo-convex shape 22 and have a negative impact on the flow of the fluid, and can also avoid the situation where two adjacent hollow portions 121 are too far apart, which may reduce the interaction between the two adjacent hollow portions 121.

[0054] or, With such a setting, the spacing between two adjacent hollow portions 121 can be set within a reasonable range according to the distance between the first concavo-convex shape 21 and the second concavo-convex shape 22. int With W f If the ratio of Q is too large, the interaction effect between the first concavo-convex shape 21 and the second concavo-convex shape 22 will be reduced. int With W f If the ratio of Q is too small, the first concavo-convex shape 21 and the second concavo-convex shape 22 will be too close to each other, which will cause turbulence that is not conducive to the flow of the fluid. int With W f Limiting the ratio of within a certain range can enhance the interaction between two adjacent hollow portions 121.

[0055] Or, 1mm≤W f Such a configuration can avoid the situation where the fluid flows too long on a single bridge piece 20 to generate a flow boundary layer, and can also avoid the situation where the bridge piece 20 is too short in the flow direction of the fluid to cause a negative impact on the fluid.

[0056] Alternatively, the above three configurations may be satisfied at the same time. With such a configuration, the disturbing effect of the bridge fins 20 on the fluid can be further enhanced, and the heat exchange efficiency of the fins can be further improved.

[0057] In this embodiment, the width of the guide plate 12 is F wp , the length of the hollow portion 121 is L s , With such a configuration, when the length of the hollow portion 121 is small, the area of ​​the guide plate 12 occupied by the hollow portion 121 will be reduced, and the area of ​​the bridge piece 20 corresponding to the hollow portion 121 will also be reduced, which will reduce the disturbance effect of the bridge piece 20 on the fluid; and when the length of the hollow portion 121 is large, the area of ​​the guide plate 12 used for support will be reduced, which will reduce the support effect of the guide plate 12 and the strength of the guide plate 12. Setting the length of the hollow portion 121 and the width of the guide plate 12 within this range can enhance the effect of the hollow portion 121 and the bridge piece 20 on the fluid without affecting the strength of the guide plate 12.

[0058] Specifically, the width of the guide plate 12 is F wp , the length of the hollow portion 121 is L s , 0.6mm≤(F wp -L s ) / 2≤1.5mm. With such a setting, a gap is obtained between the side of the hollow portion 121 and the side of the guide plate 12. Setting the gap within this range can enhance the flow effect of the fluid without affecting the strength of the guide plate 12.

[0059] In this embodiment, the length of the hollow portion 121 is L s , By adopting such a setting, the length-to-width ratio of the hollow portion 121 can be set within a reasonable range, which can prevent the hollow portion 121 from being too short and making the hollow portion 121 ineffective, while also preventing the hollow portion 121 from being too long and making the bridge piece 20 corresponding to the hollow portion 121 too long and generating a flow boundary layer.

[0060] Specifically, the bridge piece 20 includes a first support piece 24, a guide piece 25, and a second support piece 26 connected in sequence, wherein one end of the first support piece 24 away from the guide piece 25 is connected to one end of the hollow portion 121, and one end of the second support piece 26 away from the guide piece 25 is connected to the other end of the hollow portion 121. The distance between the guide piece 25 and the guide plate 12 is H, 0.6mm≤H≤0.8mm. With such a setting, since an excessively high guide piece 25 will occupy a larger space, and a smaller guide piece 25 will produce a larger resistance to the flow of the fluid, such a height setting can effectively exchange heat between the fluid while avoiding the guide piece 25 being too high to affect the assembly of the fins.

[0061] Alternatively, there is a first preset angle β between the first support plate 24 and the guide plate 25, 25°≤β≤30°. Alternatively, there is a second preset angle γ between the second support plate 26 and the guide plate 25, 25°≤γ≤30°. Alternatively, 25°≤β≤30° and 25°≤γ≤30° can be simultaneously set. With such a setting, an inwardly concave structure can be formed on both sides of the bridge plate, which can effectively guide the fluid and increase the heat exchange area of ​​the bridge plate 20 to a certain extent. At the same time, the angle limitation can also avoid the situation where the bridge plate is set too high or too low.

[0062] Specifically, there are multiple bridge pieces 20 in this embodiment, and the sizes of the flow-guiding gaps between at least two bridge pieces 20 and the hollow portion 121 are different. With such a structural arrangement, at least two bridge pieces 20 can be arranged in a staggered manner, thereby increasing the turbulence effect and improving the heat exchange efficiency.

[0063] Preferably, the sizes of the flow-guiding gaps between the multiple bridge pieces 20 and the hollow portion 121 can be different, that is, the multiple bridge pieces 20 are arranged in a staggered manner in order to better increase the turbulence effect and improve the heat exchange efficiency.

[0064] In the second embodiment of the present invention, a heat exchange device is provided. The heat exchange device comprises the fins and heat exchange flat tubes in the first embodiment. The fins are mounted on the heat exchange flat tubes.

[0065] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: by arranging a bridge piece 20 on the fin body 10 of the fin, a first concave-convex shape 21 can be arranged on the bridge piece 20 so that the fluid is impacted and vortices are generated when the fluid arrives, so as to enhance the heat exchange effect between the fluid and the fin through the generated fluid vortex, thereby solving the technical problem of poor heat exchange efficiency when the fluid flows through the fin in the prior art.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0068] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0069] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0070] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fin, characterized in that: include: A fin body (10), the fin body (10) comprising a mounting portion (11) and a guide plate (12) connected to each other, the mounting portion (11) being used for mounting on a structure to be connected, the guide plate (12) being provided with a hollow portion (121), the hollow portion (121) extending along a first preset direction; a bridge piece (20) extending along the first preset direction, both ends of the bridge piece (20) being connected to the guide plate (12), the bridge piece (20) being installed at the hollow portion (121), and at least a portion of the bridge piece (20) being spaced apart from the hollow portion (121) to form a guide gap; Wherein, at least a portion of the edge of the bridge piece (20) on one side close to the mounting portion (11) is in a first concave-convex shape (21).

2. The fin according to claim 1, characterized in that: At least a portion of an edge of the bridge piece (20) on a side away from the mounting portion (11) is in a second concave-convex shape (22).

3. The fin according to claim 2, characterized in that: The first concavo-convex shape (21) is adaptively arranged with the second concavo-convex shape (22), the convex part of the first concavo-convex shape (21) is arranged correspondingly with the convex part of the second concavo-convex shape (22), and the concave part of the first concavo-convex shape (21) is arranged correspondingly with the concave part of the second concavo-convex shape (22).

4. The fin according to claim 1, characterized in that: Both sides of the bridge piece (20) are provided with flow-guiding protrusions (23); The width of the guide protrusion (23) is T uw , 2mm≤T uw ≤5mm; and / or, The height of the guide protrusion (23) is T uh , 0.5mm≤T uh ≤1.5mm; and / or, The flow-guiding protrusion (23) is a triangular structure, and the flow-guiding vertex angle of the flow-guiding protrusion (23) is α, 90°≤α≤150°.

5. The fin according to claim 2, characterized in that: There are a plurality of hollow portions (121), and the plurality of hollow portions (121) are arranged on the guide plate (12) at intervals along a second preset direction of the guide plate (12), and the second preset direction is arranged at a preset angle to the first preset direction; there are a plurality of bridge pieces (20), and the plurality of bridge pieces (20) are arranged in one-to-one correspondence with the plurality of hollow portions (121), and each bridge piece (20) is arranged at a corresponding hollow portion (121); the spacing between two adjacent hollow portions (121) is Q int , the distance between the first concavo-convex shape (21) and the second concavo-convex shape (22) is W f ; Among them, 1.0mm≤Q int ≤1.5mm; and / or, and / or, 1mm≤W f ≤2mm。 6. The fin according to claim 2, characterized in that: The width of the guide plate (12) is F wp The length of the hollow portion (121) is L s , 7. The fin according to claim 2, characterized in that: The width of the guide plate (12) is F wp The length of the hollow portion (121) is L s , 0.6mm≤(F wp -L s ) / 2≤1.5mm.

8. The fin according to claim 5, characterized in that: The length of the hollow portion (121) is L s , 9. The fin according to claim 1, characterized in that: The bridge piece (20) comprises a first supporting piece (24), a guide piece (25) and a second supporting piece (26) which are connected in sequence, wherein one end of the first supporting piece (24) away from the guide piece (25) is connected to one end of the hollow portion (121), and one end of the second supporting piece (26) away from the guide piece (25) is connected to the other end of the hollow portion (121); Wherein, the distance between the guide piece (25) and the guide plate (12) is H, 0.6 mm ≤ H ≤ 0.8 mm; and / or, A first preset angle β is formed between the first support sheet (24) and the guide sheet (25), 25°≤β≤30°; and / or, A second preset angle γ is formed between the second support plate (26) and the guide plate (25), and the angle is 25°≤γ≤30°.

10. The fin according to claim 1, characterized in that There are a plurality of bridge pieces (20), and the sizes of the flow guide gaps between at least two of the plurality of bridge pieces (20) and the hollow portion (121) are different; and / or, The first concavo-convex shape (21) is a sawtooth structure.

11. A heat exchange device, characterized in that: include: The fin according to any one of claims 1 to 10; The heat exchange flat tubes are mounted on the fins.

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