Fin of heat exchanger, heat exchanger and air conditioner

Abstract

The present invention provides a fin of a heat exchanger, a heat exchanger and an air conditioner, wherein the fin includes a winglet, which is arranged on the fin and located around the outer side of the tube wall in the heat exchanger, and the distance between a point on the inner wall of the winglet and the axis of the tube wall is a distance R, and the distance R gradually decreases from the leading edge to the trailing edge of the winglet.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a fin of a heat exchanger, a heat exchanger and an air conditioner. Background Art

[0002] In recent years, with the development of air-conditioning technology and the improvement of air-conditioning energy efficiency standards at home and abroad, in order to meet the requirements of air-conditioning energy efficiency, the requirements for the heat exchange efficiency of heat exchangers are also constantly increasing.

[0003] The heat transfer resistance of existing heat exchangers is mainly the heat transfer resistance on the air side, so the heat exchanger enhancement technology mainly optimizes the design of the air side fins to improve the performance of the heat exchanger and thus the performance of the air conditioner. Although the current fin heat exchanger can improve the heat transfer capacity by enhancing air disturbance, this method will increase the flow resistance on the air side, so the heat transfer capacity of the heat exchanger is limited. Summary of the invention

[0004] To solve at least one of the above problems, the present invention provides a fin for a heat exchanger, wherein the fin includes a winglet, which is arranged on the fin and located around the outer side of the tube wall in the heat exchanger, and the distance between a point on the inner wall of the winglet and the axis of the tube wall is a distance R, and the distance R gradually decreases from the leading edge to the trailing edge of the winglet.

[0005] By adopting the above technical scheme, the present invention is based on the existing heat exchanger, by setting a wing, specifically setting the wing on the fin, and being located around the outer side of the tube wall, and at the same time, the distance between the point on the inner wall of the wing and the axis of the tube wall is the distance R, and the distance R gradually decreases from the leading edge to the trailing edge of the wing. The present invention makes full use of the longitudinal vortex principle and the jet principle. When the airflow flows through the wing, a series of longitudinal vortices will be formed at the trailing edge of the wing, that is, the tail of the wing. At the same time, the distance between the point on the inner wall of the wing and the axis of the tube wall is the distance R, and the distance R gradually decreases from the leading edge to the trailing edge of the wing, so that the airflow is accelerated along the wing to the rear of the tube wall of the tube wall, forming a jet, so as to slow down the flow separation between the airflow and the tube wall, reduce the weak heat exchange area behind the tube wall, and significantly improve the heat exchange effect near the tube wall.

[0006] Optionally, the height h of the wing gradually increases from the leading edge to the trailing edge of the wing. This structure facilitates the formation of a longitudinal vortex at the trailing edge of the wing.

[0007] Optionally, the angle γ between the outer side surface of the wing and the surface where the fin is located is in the range of 45°≤γ≤90°. This structure can ensure the contact area between the airflow and the wing, and is convenient for slowing down the flow separation between the airflow and the tube wall after the jet is formed.

[0008] Optionally, the relationship between the distance R and the minimum inner surface radius R0 of the tube wall satisfies: R=(1.02-1.3)R0. This structure limits the distance R by the minimum inner surface radius R0 of the tube wall, which can effectively ensure the distance between the wing and the tube wall and ensure the best effect.

[0009] Optionally, the number of the fins is more than one group. In this structure, the number of fins can be selected according to specific needs, and the number of fins is preferably two groups.

[0010] Optionally, when there are two groups of fins, the two groups of fins are symmetrically distributed on both sides of the tube wall, and the symmetry plane passes through the axis of the tube wall. In this structure, after the airflow passes through the two groups of fins, the speed and other states are relatively similar, so that the flow conditions on both sides of the tube wall are consistent, the heat dissipation is uniform, and the uneven heat dissipation phenomenon is avoided.

[0011] Optionally, the minimum angle θ1 formed by the projection of the inner wall of the wing on the surface where the fin is located and the incoming flow direction is in the range of 0°<θ1<30°. This structure, by limiting the minimum angle θ1, can ensure that there is a certain distance between the end of the wing away from the incoming flow direction and the tube wall, which is convenient for the airflow to flow through the wing. At the same time, this distance can ensure that the jet formed after the airflow flows through the wing can slow down the flow separation between the airflow and the tube wall.

[0012] Optionally, the maximum angle θ2 formed by the projection of the inner wall of the wing on the surface where the fin is located and the incoming flow direction is in the range of 10°<θ2<45°. This structure, by limiting the maximum angle θ2, can ensure that there is a certain distance between the wing and the tube wall, which is convenient for the airflow to flow through the wing, and at the same time, this distance can ensure that the airflow can form a jet after flowing through the wing.

[0013] Optionally, the line connecting the leading edge point of the outer edge of the tube wall closest to the inlet and the point of the center axis of the tube wall is OA; the line connecting the point of the inner wall of the leading edge of the wing and the point of the center axis of the tube wall, the projection on the surface where the fin is located is OB; the angle formed by OA and OB is α1, and the value range of α1 is: 45°<α1<90°. This structure, by limiting α1, can ensure that there is a certain distance between the wing and the tube wall, which is convenient for the airflow to flow through the wing, and at the same time, this distance can ensure that the jet formed after the airflow flows through the wing can slow down the flow separation of the airflow and the tube wall.

[0014] Optionally, the line connecting the leading edge point of the outer edge of the tube wall closest to the inlet and the point of the center axis of the tube wall is OA; the line connecting the point on the inner wall of the trailing edge of the wing and the point of the center axis of the tube wall, the projection on the surface where the fin is located is OC; the angle formed by the OA and the OC is α2, and the value range of α2 is: 100°<α2<150°. This structure, by limiting α2, can ensure that there is a certain distance between the wing and the tube wall, which is convenient for airflow to flow through the wing, and at the same time, this distance can ensure that the airflow can form a jet after flowing through the wing.

[0015] Optionally, the wing includes more than one small wing. This structure can facilitate adjustment of the structure of the wing and processing of the wing.

[0016] Optionally, when the number of the fins is more than two, the fins include a first fin and a second fin, the number of the first fin is one, the number of the second fin is more than one, and the first fin and the second fin are arranged sequentially from the leading edge to the trailing edge of the fin. In this structure, when the airflow flows through the fin, it first contacts the first fin and then contacts the second fin, so the contact area between the airflow and the fin will gradually increase, which is conducive to reducing the flow loss at the initial contact position between the airflow and the fin, so that the airflow changes direction more naturally under the action of the fin to form a jet, further slowing down the flow separation between the airflow and the tube wall, reducing the weak heat exchange area behind the tube wall, and improving the heat exchange effect near the tube wall.

[0017] Optionally, the first fin is in a triangular shape, and the second fin is in a quadrilateral shape; or both the first fin and the second fin are quadrilateral shapes. With this structure, the contact area between the airflow and the fins will gradually increase, which can slow down the flow separation between the airflow and the tube wall, reduce the weak heat exchange area behind the tube wall, and improve the heat exchange effect near the tube wall.

[0018] Optionally, the fin includes a hollow slit, and the hollow slit is arranged on the outer side of the wing. This structure facilitates the joint processing of the wing and the hollow slit, and one-time molding. In addition, the hollow slit can also increase the speed and disturbance of the airflow, and can effectively enhance the heat exchange effect. Furthermore, the hollow slit can facilitate frost, dust, water, etc. to flow out through the hollow slit in time, avoiding the reduction of the heat exchange efficiency of the heat exchanger.

[0019] Optionally, the wing and the hollow slit are formed by one-time stamping. This method facilitates the processing of the wing and the hollow slit.

[0020] Optionally, the number of the fins is multiple, the multiple fins are stacked, and the tube wall is inserted into the stacked fins. This structure is convenient for making heat exchangers of different specifications according to specific conditions. The refrigerant can flow in the tube wall, and can flow in other tubes built into the tube wall, such as copper tubes.

[0021] Optionally, the distance H between two adjacent fins is greater than the maximum height h of the fins. max This structure is convenient for protecting the structure of the fins and preventing the fins from being damaged when they are stacked and assembled.

[0022] The present invention further provides a heat exchanger, comprising fins and tube walls, and the heat exchanger comprises any one of the fins described above.

[0023] Optionally, there are multiple tube walls, which are arranged in multiple rows, the tube walls in the same row are arranged at intervals, and the tube walls in adjacent rows are arranged in a staggered manner. This method can increase the contact area between the airflow and the tube wall, increase the disturbance of the air, and thus effectively improve the heat exchange efficiency.

[0024] The present invention also provides an air conditioner, comprising the heat exchanger described in any one of the above items. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial three-dimensional structural schematic diagram of a fin of a heat exchanger of the present invention;

[0026] Figure 2 A partial top view of a fin of a heat exchanger according to the present invention;

[0027] Figure 3 A partial side view of a fin of a heat exchanger according to the present invention Figure 1 ;

[0028] Figure 4 A partial side view of a fin of a heat exchanger according to the present invention Figure 2 ;

[0029] Figure 5 A partial side view of a fin of a heat exchanger according to the present invention Figure 3 ;

[0030] Figure 6 It is a schematic diagram of a partial three-dimensional structure of a fin of a heat exchanger of the present invention (with hollow slits);

[0031] Figure 7 It is a partial top view of a fin of a heat exchanger of the present invention (with hollow slits);

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of a heat exchanger of the present invention;

[0033] Fig. 9 This is an experimental diagram of the flow field difference of a heat exchanger of the present invention.

[0034] Description of reference numerals:

[0035] 10-fin; 110-winglet; 111-small winglet; 1111-first small winglet; 1112-second small winglet; 120-hollow slit; 20-tube wall. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] Example 1

[0039] like Figure 1 As shown, the present invention provides a fin of a heat exchanger, wherein the fin 10 includes a fin 110, which is arranged on the fin 10 and is located around the outer side of a tube wall 20 in the heat exchanger; the distance between a point on the inner wall of the fin 110 and the axis of the tube wall 20 is a distance R, and the distance R gradually decreases from the leading edge to the trailing edge of the fin 110.

[0040] On the basis of the existing heat exchanger, the present invention provides a fin 110, specifically, the fin 110 is provided on the fin 10, and is located around the outer side of the tube wall 20, and at the same time, the distance between the point on the inner wall of the fin 110 and the axis of the tube wall 20 is the distance R, and the distance R gradually decreases from the leading edge to the trailing edge of the fin 110. The present invention makes full use of the longitudinal vortex principle and the jet principle. When the airflow flows through the fin 110, a series of longitudinal vortices will be formed at the trailing edge of the fin 110, that is, the tail of the fin 110. At the same time, the distance between the point on the inner wall of the fin 110 and the axis of the tube wall 20 is the distance R, and the distance R gradually decreases from the leading edge to the trailing edge of the fin 110, so that the airflow is accelerated along the fin 110 to flow to the rear of the tube wall 20, forming a jet, so as to slow down the flow separation between the airflow and the tube wall 20, reduce the weak heat exchange area behind the tube wall 20, and significantly improve the heat exchange effect near the tube wall 20.

[0041] The distance R between the point on the inner wall of the leading edge of the wing 110 and the axis of the tube wall 20 is the maximum distance R max The distance R between the point on the inner wall of the trailing edge of the wing 110 and the axis of the tube wall 20 is the minimum distance R min .

[0042] The inner wall of the fin 110 is the side wall of the fin 100 close to the tube wall 20 .

[0043] In some embodiments, the height h of the wing 110 gradually increases from the leading edge to the trailing edge of the wing 110. This structure facilitates the formation of a longitudinal vortex at the trailing edge of the wing 110.

[0044] In some embodiments, the angle γ between the outer side of the fin 110 and the surface of the fin 10 is in the range of 45°≤γ≤90°. This structure can ensure the contact area between the airflow and the fin 110, and facilitate the slowing down of the flow separation between the airflow and the tube wall 20 after the jet is formed.

[0045] like Figure 2 As shown, in some embodiments, the relationship between the distance R and the minimum inner surface radius R0 of the tube wall 20 satisfies: R = (1.02-1.3) R0. This structure limits the distance R by the minimum inner surface radius R0 of the tube wall 20, which can effectively ensure the distance between the fin 110 and the tube wall 20 and ensure the optimal effect. For example, when the value of R0 is 11 mm, the value range of R is 11.22 mm to 14.3 mm.

[0046] In some embodiments, the number of the fins 110 is more than one group. In this structure, the number of the fins 110 can be selected according to specific needs, and the number of the fins 110 is preferably two groups.

[0047] In this embodiment, when there are two groups of fins 110, the two groups of fins 110 are symmetrically distributed on both sides of the tube wall 20, and the symmetry plane passes through the axis of the tube wall 20. In this structure, after the airflow passes through the two groups of fins 110, the speed and other states are relatively similar, so that the flow conditions on both sides of the tube wall are consistent, the heat dissipation is uniform, and the uneven heat dissipation phenomenon is avoided.

[0048] like Figure 2 As shown, in some embodiments, the minimum angle θ1 formed by the projection of the inner wall of the winglet 110 on the surface where the fin 10 is located and the incoming flow direction has a value range of: 0°<θ1<30°. Among them, the minimum angle θ1 is the angle formed by the projection of the inner wall of the leading edge of the winglet 110 on the surface where the fin 10 is located and the incoming flow direction. When the number of the small winglets 111 is more than two, it is the angle formed by the projection of the inner wall of the first small winglet 1111 on the surface where the fin 10 is located and the incoming flow direction. The smaller the angle between the projection of the inner wall of the vane 110 on the surface where the fin 10 is located and the incoming flow direction, the farther the end of the vane 110 away from the incoming flow direction is from the tube wall 20. This structure, by limiting the minimum angle θ1, can ensure that there is a certain distance between the end of the vane 110 away from the incoming flow direction and the tube wall 20, which is convenient for the airflow to flow through the vane 110. At the same time, this distance can ensure that the jet formed after the airflow flows through the vane 110 can slow down the flow separation between the airflow and the tube wall 20.

[0049] In some embodiments, the maximum angle θ2 formed by the projection of the inner wall of the winglet 110 on the surface where the fin 10 is located and the incoming flow direction is in the range of 10°<θ2<45°. The maximum angle θ2 is the angle formed by the projection of the inner wall of the trailing edge of the winglet 110 on the surface where the fin 10 is located and the incoming flow direction. When the number of the winglets 111 is more than two, that is, the second winglet 1112 farthest from the first winglet 1111, the projection of the inner wall of the second winglet 1112 on the surface where the fin 10 is located and the incoming flow direction. The larger the angle between the projection of the inner wall of the vane 110 on the surface where the fin 10 is located and the incoming flow direction, the closer the end of the vane 110 away from the incoming flow direction is to the tube wall 20. This structure, by limiting the maximum angle θ2, can ensure that there is a certain distance between the vane 110 and the tube wall 20, which facilitates the airflow to flow through the vane 110. At the same time, this distance can ensure that the airflow can form a jet after flowing through the vane 110.

[0050] In some embodiments, the line connecting the leading edge point of the outer edge of the tube wall 20 closest to the inlet and the point on the central axis of the tube wall 20 is OA; the line connecting the point on the inner wall of the leading edge of the wing 110 and the point on the central axis of the tube wall 20 is projected on the surface where the fin 10 is located as OB; the angle formed by OA and OB is α1, and the value range of α1 is: 45°<α1<90°. Among them, α1 is ∠AOB. This structure, by limiting α1, can ensure that there is a certain distance between the wing 110 and the tube wall 20, which is convenient for the airflow to flow through the wing 110. At the same time, this distance can ensure that the jet formed after the airflow flows through the wing 110 can slow down the flow separation of the airflow and the tube wall 20.

[0051] In some embodiments, the line connecting the leading edge point of the outer edge of the tube wall 20 closest to the inlet and the point on the central axis of the tube wall 20 is OA; the line connecting the point on the inner wall of the trailing edge of the winglet 110 and the point on the central axis of the tube wall 20 is projected on the surface where the fin 10 is located as OC; the angle formed by OA and OC is α2, and the value range of α2 is: 100°<α2<150°. Among them, α2 is ∠AOC. This structure, by limiting α2, can ensure that there is a certain distance between the winglet 110 and the tube wall 20, which is convenient for the airflow to flow through the winglet 110, and at the same time, this distance can ensure that the airflow can form a jet after flowing through the winglet 110.

[0052] like Figure 3-5 As shown, in some embodiments, the wing 110 includes more than one small wing 111. This structure can facilitate the adjustment of the structure of the wing 110 and the processing of the wing 110.

[0053] In this embodiment, when the number of the winglets 111 is more than two, the winglets 111 include a first winglet 1111 and a second winglet 1112, the number of the first winglet 1111 is one, the number of the second winglet 1112 is more than one, the first winglet 1111 and the second winglet 1112 are arranged in sequence from the leading edge to the trailing edge of the winglet 110; the shape of the first winglet 1111 is a triangle, and the shape of the second winglet 1112 is a quadrilateral; or the first winglet 1111 and the second winglet 1112 are both quadrilaterals. The quadrilateral is preferably a trapezoid, and the two parallel sides of the trapezoid are perpendicular to the surface where the fin 10 is located. With this structure, when the airflow flows through the fin 110, it first contacts the first small fin 1111 and then contacts the second small fin 1112. Therefore, the contact area between the airflow and the fin 110 will gradually increase, which is beneficial to reduce the flow loss at the initial contact position between the airflow and the fin, so that the airflow can change direction more naturally under the action of the fin to form a jet, further slowing down the flow separation between the airflow and the tube wall 20, reducing the weak heat exchange area behind the tube wall 20, and improving the heat exchange effect near the tube wall 20.

[0054] In some embodiments, the number of fins 10 is multiple, and the multiple fins 10 are stacked, and the tube wall 20 is inserted into the stacked fins 10. This structure is convenient for making heat exchangers of different specifications according to specific conditions. The refrigerant can flow in the tube wall 20, and can flow in other tubes built into the tube wall 20, such as copper tubes.

[0055] In this embodiment, the distance H between two adjacent fins 10 is greater than the maximum height h of the fin 110. max This structure is convenient for protecting the structure of the fin 110 and preventing the fin 110 from being damaged when the fins 10 are stacked and assembled.

[0056] like Figure 6-7 As shown, in some embodiments, the fin 10 includes a hollow slit 120, and the hollow slit 120 is arranged on the outside of the wing 110. Preferably, the shape of the hollow slit 120 is the same as that of the wing 110. In this structure, the shape of the hollow slit 120 is the same as that of the wing 110, which facilitates the joint processing of the wing 110 and the hollow slit, and one-time molding. In addition, the hollow slit 120 can also increase the speed and disturbance of the airflow, and can effectively enhance the heat exchange effect. Furthermore, the hollow slit 120 can facilitate frost, dust, water, etc. to flow out through the hollow slit 120 in a timely manner, thereby avoiding the reduction of the heat exchange efficiency of the heat exchanger.

[0057] In this embodiment, the wing 110 and the hollow slit 120 are formed by one-time stamping, which facilitates the processing of the wing 110 and the hollow slit 120.

[0058] Example 2

[0059] like Figure 8 As shown, the present invention further provides a heat exchanger, the heat exchanger includes fins 10 and tube walls 20, and the heat exchanger includes any one of the fins 110 described above.

[0060] The copper tube passes through the tube wall 20, and the refrigerant inside the copper tube transfers the temperature to the copper tube, and the copper tube transfers the temperature to the fin 10 through the contact surface with the tube wall 20. The air flows through the fin 10 to realize the convective heat exchange of the heat exchanger.

[0061] In some embodiments, there are multiple tube walls 20, which are arranged in multiple rows, with tube walls 20 in the same row arranged at intervals, and tube walls 20 in adjacent rows arranged in a staggered manner. This method can increase the contact area between the airflow and the tube wall 20, increase the disturbance of the air, and thus effectively improve the heat exchange efficiency.

[0062] In order to further illustrate the effect of the heat exchanger of the present invention, the present invention uses the following method to illustrate the effect of the heat exchanger of the present invention.

[0063] The CFD simulation method is used to simulate the flow field difference between the heat exchanger with ordinary flat fins 10 and the heat exchanger of the present invention under the same conditions. The inlet and outlet static pressure difference (outlet static pressure value minus inlet static pressure value) -20Pa is used to replace the effect of the fan on the heat exchanger under the high-speed wind condition of the air conditioner indoor unit. The ambient temperature is set to 27°C, and the inner surface of the tube wall 20 is set to a constant temperature of 12°C to replace the effect of the refrigerant in the copper tube of the heat exchanger. Fluent software is used for calculation to obtain Figure 7 Results shown.

[0064] in, Fig. 9 The velocity cloud diagrams of the heat exchanger with ordinary flat fins 10 (left figure) and the heat exchanger of the present invention (right figure) at the same position section. It can be seen that the present invention, through the action of the fins 110, makes the airflow velocity near the tube wall 20 significantly greater than that of the flat fins, slows down the flow separation around the tube wall 20, and significantly reduces the weak heat exchange area behind the tube wall 20 (black area).

[0065] Example 3

[0066] The present invention also provides an air conditioner, comprising the heat exchanger described in any one of the above items.

[0067] The leading edge of the wing 110 involved in the present invention refers to: a position close to the inflow of airflow;

[0068] The trailing edge of the wing 110 refers to: a position close to the outflow of the airflow;

[0069] The incoming flow direction refers to the direction in which the airflow flows.

[0070] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A fin of a heat exchanger, characterized in that: The fin (10) comprises a fin (110), the fin (110) being arranged on the fin (10) and being located around the outer side of a tube wall (20) in the heat exchanger; the distance between a point on the inner wall of the fin (110) and the axis of the tube wall (20) is a distance R, and the distance R gradually decreases from the leading edge to the trailing edge of the fin (110); The height h of the wing (110) gradually increases from the leading edge to the trailing edge of the wing (110); The value range of the angle γ between the outer side surface of the wing (110) and the surface where the fin (10) is located is: 45°≤γ≤90°.

2. The fin according to claim 1, characterized in that: The relationship between the distance R and the minimum inner surface radius R0 of the tube wall (20) satisfies: R=(1.02-1.3)R0.

3. The fin according to claim 1, characterized in that: The number of the fins (110) is more than one group.

4. The fin according to claim 3, characterized in that: When the number of the fins (110) is two groups, the two groups of fins (110) are symmetrically distributed on both sides of the tube wall (20).

5. The fin according to claim 1, characterized in that: The range of the minimum angle θ1 formed by the projection of the inner wall of the wing (110) on the surface where the fin (10) is located and the incoming flow direction is: 0°<θ1<30°.

6. The fin according to claim 1, characterized in that: The maximum angle θ2 formed by the projection of the inner wall of the wing (110) on the surface where the fin (10) is located and the incoming flow direction has a value range of: 10°<θ2<45°.

7. The fin according to claim 1, characterized in that: The line connecting the leading edge point of the outer edge of the tube wall (20) closest to the inlet and the point on the central axis of the tube wall (20) is OA; the line connecting the point on the inner wall of the leading edge of the wing (110) and the point on the central axis of the tube wall (20) is projected on the surface where the fin (10) is located as OB; the angle formed by OA and OB is α1, and the value range of α1 is: 45°<α1<90°.

8. The fin according to claim 1, characterized in that: The line connecting the leading edge point of the outer edge of the tube wall (20) closest to the inlet and the point on the central axis of the tube wall (20) is OA; the line connecting the point on the inner wall of the trailing edge of the wing (110) and the point on the central axis of the tube wall (20), the projection of which on the surface where the fin (10) is located is OC; the angle formed by the OA and the OC is α2, and the value range of α2 is: 100°<α2<150°.

9. The fin according to claim 1, characterized in that: The wing (110) includes more than one small wing (111).

10. The fin according to claim 9, characterized in that: When the number of the winglets (111) is more than two, the winglets (111) include a first winglet (1111) and a second winglet (1112), the number of the first winglet (1111) is one, the number of the second winglet (1112) is more than one, and the first winglet (1111) and the second winglet (1112) are arranged sequentially from the leading edge to the trailing edge of the winglet (110).

11. The fin according to claim 10, characterized in that: The shape of the first winglet (1111) is a triangle, and the shape of the second winglet (1112) is a quadrilateral; or the first winglet (1111) and the second winglet (1112) are both quadrilaterals.

12. The fin according to claim 1, characterized in that: The distance H between two adjacent fins (10) is greater than the maximum height h of the wing (110). max .

13. The fin according to claim 1, characterized in that: The fin (10) comprises a hollow slit (120), and the hollow slit (120) is arranged on the outer side of the wing (110).

14. The fin according to claim 13, characterized in that: The wing piece (110) and the hollow slit (120) are formed by one-time stamping.

15. A heat exchanger, comprising a tube wall (20), characterized in that: The heat exchanger further comprises the fin according to any one of claims 1-14.

16. The heat exchanger according to claim 15, characterized in that: The number of the tube walls (20) is plural, and the multiple tube walls (20) are distributed in multiple rows. The tube walls (20) in the same row are distributed at intervals, and the tube walls (20) in adjacent rows are distributed in a staggered manner.

17. An air conditioner, characterized in that: The air conditioner comprises the heat exchanger according to any one of claims 15-16.

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