A fin and its processing method, a heat exchanger and an air conditioner

Abstract

The present invention relates to the technical field of heat exchange. Its purpose is to provide a fin with good support effect between adjacent fins. The fin of the present invention includes a connecting portion that extends vertically in the vertical direction, a plurality of fin bodies connected to the connecting portion, and the plurality of fin bodies are vertically spaced apart along the connecting portion. A flat tube slot is formed between the adjacent fin bodies up and down; a flanging portion is connected to at least one side of each fin body in the up and down direction; the flanging portion includes a first folding portion, and one side of the first folding portion is connected to the fin body; there is a convex bump protruding along the surface of the first folding portion. For the fin of the present invention, by providing a convex bump on the first folding portion, the strength of the first folding portion can be enhanced. The distance between adjacent fins is positioned through the first folding portion, and the support effect is good, the positioning is firm, and problems such as fin misalignment, fin falling, and fin overlapping are not likely to occur.

Description

Technical Field

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

[0002] Compared with traditional heat exchange tubes, the heat transfer coefficient of microchannel flat tubes can be increased by more than 100%, so they have natural advantages in heat transfer performance. Moreover, compared with traditional copper tubes, aluminum microchannel flat tubes have lower costs and lighter weights. In recent years, microchannel heat exchangers have received extensive attention in the market. Currently, in the field of commercial air conditioners, Daikin and Mitsubishi Electric in Japan have successively launched multi-connected unit products with microchannel heat exchangers. From the actual application effects, after using microchannel heat exchangers, the heat transfer capacity and energy efficiency value of the units have reached the highest level in the industry, and the refrigerant charge has been greatly reduced.

[0003] There are mainly two ways to achieve fin pitch. The first is to add flanges on the inner surface of the fin, and the second is to design flanges at the flat tube slots of the fin. Although the first implementation method has good positioning effect for fin pitch, under evaporator conditions, droplets are likely to hang on the flanged part and form water bridges. In the second implementation method, when the fin pitch is relatively large (such as 1.6 mm), the flanged part will tilt under extrusion, resulting in a smaller fin pitch, unstable fin pitch positioning, and quality defects such as poor appearance. Summary of the Invention

[0004] To solve the problems of unstable fin pitch positioning and quality defects such as fin lodging and poor appearance that are likely to occur in the existing technology, embodiments of the present invention provide a fin and its processing method, a heat exchanger, and an air conditioner, which are designed with flanged parts with convex bumps on each fin body, and have good support effects between adjacent fins, and are not prone to problems such as misalignment, fin falling, and lamination.

[0005] To achieve the above object, embodiments of the present invention adopt the following technical solutions:

[0006] The present invention provides a fin, including:

[0007] A connecting part that extends vertically in the vertical direction,

[0008] A plurality of fin bodies connected to the connecting part, and the plurality of fin bodies are vertically spaced along the connecting part, and a flat tube slot is formed between adjacent upper and lower fin bodies;

[0009] A flanged part connected to at least one side of each fin body in the up and down direction; the flanged part includes a first folding part, and one side of the first folding part is connected to the fin body; a convex bump protruding along its surface is provided on the first folding part.

[0010] In one embodiment, the flanging portion further includes a second folding portion, the second folding portion is connected to the other side of the first folding portion, and the second folding portion is folded toward the outside of the flat tube slot.

[0011] In one embodiment, the first folding portions are respectively arranged on the upper and lower sides of each fin body, and the adjacent first folding portions on the upper side and the lower side of each fin body are arranged at intervals in the horizontal direction.

[0012] In one embodiment, among the left and right sides of the fin, the side close to the fin body is the windward end, and the side close to the connecting portion is the leeward end; a transverse first protrusion is provided on the side of the fin body close to the windward end.

[0013] Preferably, the fin body includes a connected rectangular portion and a necking portion, the rectangular portion is connected to the connecting portion, and the necking portion is formed by inward contraction from the upper and lower sides at the windward end of the fin body; the first protrusion extends from the necking portion to the rectangular portion.

[0014] Preferably, a plurality of first protrusions are provided, and the plurality of first protrusions are arranged at intervals up and down.

[0015] In one embodiment, among the left and right sides of the fin, the side close to the fin body is the windward end, and the side close to the connecting portion is the leeward end; an obliquely upward second protrusion is provided on the fin body.

[0016] In one embodiment, the convex hull protrudes toward the outside of the flat tube slot.

[0017] In one embodiment, the height range of the convex hull is 0.1 mm to 0.5 mm.

[0018] The present invention further includes a heat exchanger, including a plurality of flat tubes, and the flat tubes stack a plurality of the above-mentioned fins through flat tube slots.

[0019] The present invention further includes an air conditioner, including the above-mentioned heat exchanger.

[0020] The present invention further includes a fin processing method. The fin includes a connecting portion, a plurality of fin bodies, and a flanging portion. The connecting portion extends vertically in the vertical direction; the plurality of fin bodies are connected to the connecting portion, and the plurality of fin bodies are arranged at intervals vertically along the connecting portion, and a flat tube slot is formed between the adjacent upper and lower fin bodies; the flanging portion is connected to at least one side of each fin body in the up and down direction; the flanging portion includes a first folding portion, and one side of the first folding portion is connected to the fin body; a convex hull protruding along its surface is provided on the first folding portion; the fin processing method includes:

[0021] Sheet blanking, place the sheet on the mold and trim the edges of the sheet;

[0022] Pre - forming of the convex hull, form the convex hull by die - pressing or extrusion using a concave - convex die;

[0023] Punching and forming, cut off the excess sheet along the cutter path with a cutter and form a preliminary outline of the flanging part;

[0024] Bending and forming, successively bend the flanging part along the folding line through a mold.

[0025] The technical solution of the present invention has the following technical effects compared with the prior art:

[0026] For the above - mentioned fin, by setting a convex hull on the first folding part, the strength of the first folding part can be enhanced. The distance between adjacent fins is positioned by the first folding part, with good support effect, firm positioning, and it is not easy to have problems such as fin misalignment, fin inversion, and fin lamination. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic structural diagram of the fin of the present invention;

[0029] Figure 2 It is a side view and a partial enlarged view of the fin of the present invention;

[0030] Figure 3 It is a schematic structural diagram of the flanging part in the fin of the present invention;

[0031] Figure 4 It is the forming step of the fin processing method of the present invention Figure 1 ;

[0032] Figure 5 It is the forming step of the fin processing method of the present invention Figure 2 ;

[0033] Explanation of the reference numerals:

[0034] 100 - connecting part;

[0035] 200 - fin body; 210 - rectangular part; 220 - necking part; 230 - first convex part; 240 - second convex part;

[0036] 300 - Flanging part; 310 - First folding part; 311 - Convex hull; 320 - Second folding part;

[0037] 400 - Flat tube slot. Detailed implementation manner

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0041] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.

[0042] Such as Figures 1 - 5As shown, the fins of this embodiment are applied to a microchannel heat exchanger, which includes multiple flat tubes. The flat tubes stack multiple fins through flat tube slots. Specifically, the fin includes a connecting portion 100, multiple fin bodies 200, and a flanging portion 300. Among them, the connecting portion 100 extends vertically in the vertical direction. The multiple fin bodies 200 are connected to the connecting portion 100, and the multiple fin bodies 200 are vertically spaced along the connecting portion 100. A flat tube slot 400 is formed between adjacent upper and lower fin bodies 200, and the flat tube slot 400 is used to insert a flat tube. The flanging portion 300 is connected to at least one side of each fin body 200 in the up and down direction, that is, the flanging portion 300 surrounds the flat tube slot 400. As Figure 2 and Figure 3 shown, the flanging portion 300 includes a connected first folding portion 310 and a second folding portion 320. One side of the first folding portion 310 is connected to the fin body 200, the other side of the first folding portion 310 is connected to the second folding portion 320, and the second folding portion 320 is folded towards the outside of the flat tube slot. Preferably, the first folding portion 310 is perpendicularly arranged with the fin body 200. Adjacent fins are abutted against each other through the second folding portion 320, and the bending height of the first folding portion 310 is the fin pitch. Among them, there is a convex bump 311 protruding along its surface on the first folding portion 310. Due to the limitation of the processing surplus of the fin, the folding height of the second folding portion 320 cannot be too large. When the folding height of the second folding portion 320 is reduced to 0.5 mm or less, the stress will concentrate on the first folding portion 310. At this time, a relatively large fin pitch, such as 1.6 mm, often causes the first folding portion 310 to be squeezed and tilted, resulting in a smaller fin pitch. Therefore, setting the convex bump 311 can increase the strength of the first folding portion 310.

[0043] For the above-mentioned fin, by setting the convex bump 311 on the first folding portion 310, the strength of the first folding portion 310 can be enhanced. The distance between adjacent fins is positioned through the first folding portion 310, with good supporting effect, firm positioning, and it is not easy to have problems such as fin misalignment, fin falling, and fin overlapping.

[0044] Preferably, flanging portions 300 are respectively arranged on the upper and lower sides of each fin body, and the adjacent upper-side flanging portion and lower-side flanging portion in each fin body are spaced in the horizontal direction. In this embodiment, two flanging portions are arranged on both the upper and lower sides of each fin body, that is, the flanging portion 300a, the flanging portion 300b, the flanging portion 300c, and the flanging portion 300d. The flanging portion 300a and the flanging portion 300b are on the same side, and the flanging portion 300c and the flanging portion 300d are on the same side. There is a gap of more than 1 mm between the flanging portion 300a and the flanging portion 300c, between the flanging portion 300c and the flanging portion 300b, and between the flanging portion 300b and the flanging portion 300d.

[0045] As shown in the figure, among the left and right sides of the fin, the side close to the fin body 200 is the windward end, and the side close to the connecting portion 100 is the leeward end. On the side of the fin body 200 close to the windward end, there is a transverse first convex portion 230. The first convex portion 230 can improve the structural strength of the fin body 200. The first convex portion 230 is arranged transversely, which can minimize the influence of the convex on the wind resistance and improve the heat exchange efficiency. There are multiple first convex portions 230. Preferably, the multiple first convex portions 230 are arranged at intervals up and down. In this embodiment, there are two first convex portions 230, and the two first convex portions 230 are arranged at intervals, and can be evenly distributed on the fin body 200 in the up and down direction, further improving the structural strength of the fin body 200.

[0046] In this embodiment, the fin body 200 includes a connected rectangular portion 210 and a reduced opening portion 220. The rectangular portion 210 is connected to the connecting portion 100, and the reduced opening portion 220 is formed by inward contraction of the upper and lower sides of the windward end of the fin body 200. The first convex portion 230 extends from the reduced opening portion 220 to the rectangular portion 210. The first convex portion 230 has a relatively long length, which can ensure that the connection between the reduced opening portion 220 and the rectangular portion 210 is not easily broken.

[0047] On the fin body 200, there is also an obliquely upward second convex portion 240, which can strengthen the structural strength of the fin. The second convex portion 240 is in an obliquely upward manner, which can maximize the area of the second convex portion 240 under the same width of the second convex portion 240, so as to better achieve the effect of improving the structural strength of the fin. The second convex portion 240 is arranged between the first convex portion 230 and the connecting portion 100. In this embodiment, preferably, there are two second convex portions 240, which can avoid the problems of difficult processing and easy water accumulation on the fin due to too complex convex structure. The two second convex portions 240 are also arranged at intervals and can be evenly distributed on the fin body 200 in the left and right direction, further improving the structural strength of the fin body 200.

[0048] In this embodiment, the convex hull 311 protrudes toward the outside of the flat tube slot 400, that is, the convex hull 311 protrudes upward, so as to ensure that no condensed water accumulates at the location where the convex hull 311 is formed.

[0049] There are no restrictions on the shape and number of the convex hulls 311. Preferably, one convex hull 311 is provided for each first folding portion 310, and the shape of the convex hull 311 is rectangular, circular or elliptical. The convex hull 311 has a certain characteristic height, and its height range is 0.1 mm to 0.5 mm, and the preferred design value is 0.2 to 0.3 mm.

[0050] The folding height of the second folding portion 320 is less than 0.5 mm.

[0051] The present invention also includes the processing method of the above fin, seeFigure 4 and Figure 5 , the specific steps are as follows:

[0052] First step, sheet material blanking. Place the aluminum foil sheet on the mold and trim the edges of the aluminum foil sheet;

[0053] Second step, forming the first raised portion and the second raised portion. Form the first raised portion and the second raised portion by means of concave-convex die pressing;

[0054] Third step, pre-forming the convex hull. Respectively form the convex hull by means of concave-convex die pressing or extrusion according to the design values (convex hull pre-forming area A), see Figure 4 ;

[0055] Fourth step, punching and forming. Cut off the excess sheet material (punching area B) along the cutter path Q by the cutter and form a preliminary profile of the flanging portion, see Figure 5 ;

[0056] Fifth step, bending and forming. Sequentially bend the flanging portion along the first folding line L1 of the folding portion and the second folding line L2 of the folding portion by the mold.

[0057] The present invention also includes a heat exchanger, the heat exchanger is a microchannel heat exchanger, which includes a plurality of flat tubes, and the flat tubes stack a plurality of the above-mentioned fin layers through flat tube slots.

[0058] The present invention also includes an air conditioner, and the air conditioner includes the above-mentioned heat exchanger.

[0059] In the description of the above embodiments, the specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0060] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A fin, characterized in that, it includes: a connecting portion which extends vertically in the vertical direction, a plurality of fin bodies connected to the connecting portion, the plurality of fin bodies are vertically spaced along the connecting portion, and a flat tube slot is formed between adjacent fin bodies up and down; a flanging portion connected to at least one side of each fin body in the up and down direction; the flanging portion includes a connected first folding portion and a second folding portion, one side of the first folding portion is connected to the fin body; the first folding portion is perpendicularly arranged with the fin body; the bending height of the first folding portion is the fin pitch; there is a convex bulge protruding along its surface on the first folding portion; the second folding portion is connected to the other side of the first folding portion, the second folding portion is folded towards the outside of the flat tube slot, and adjacent fins are abutted against each other through the second folding portion.

2. The fin according to claim 1, characterized in that, the first folding portions are respectively arranged on the upper and lower sides of each fin body, and the adjacent upper first folding portion and lower first folding portion in each fin body are spaced horizontally.

3. The fin according to claim 1, characterized in that, among the left and right sides of the fin, the side close to the fin body is the windward end, and the side close to the connecting portion is the leeward end; there is a transverse first convex portion on the side of the fin body close to the windward end.

4. The fin according to claim 3, characterized in that, the fin body includes a connected rectangular portion and a necking portion, the rectangular portion is connected to the connecting portion, and the necking portion is formed by inward contraction from the upper and lower sides at the windward end of the fin body; the first convex portion extends from the necking portion to the rectangular portion.

5. The fin according to claim 1, characterized in that, a plurality of the first convex portions are provided, and the plurality of first convex portions are spaced up and down.

6. The fin according to claim 1, characterized in that, among the left and right sides of the fin, the side close to the fin body is the windward end, and the side close to the connecting portion is the leeward end; there is an obliquely upward second convex portion on the fin body.

7. The fin according to any one of claims 1 - 6, characterized in that, the convex bulge protrudes towards the outside of the flat tube slot.

8. The fin according to any one of claims 1 - 6, characterized in that, the height range of the convex bulge is 0.1mm - 0.5mm.

9. A heat exchanger, characterized in that, it includes a plurality of flat tubes, and the flat tubes stack a plurality of the fins according to any one of claims 1 - 8 through flat tube slots.

10. An air conditioner, characterized in that, it includes the heat exchanger according to claim 9.

11. A fin processing method, characterized in that, The fin includes a connecting portion, a plurality of fin bodies, and a flanging portion. The connecting portion extends vertically in the vertical direction; the plurality of fin bodies are connected to the connecting portion, and the plurality of fin bodies are vertically spaced apart along the connecting portion, and a flat tube slot is formed between the vertically adjacent fin bodies; the flanging portion is connected to at least one side of each fin body in the up-down direction; the flanging portion includes a first folding portion and a second folding portion connected to each other, and one side of the first folding portion is connected to the fin body; there is a convex bump protruding along its surface on the first folding portion; the first folding portion is arranged perpendicular to the fin body; the bending height of the first folding portion is the fin pitch; the second folding portion is connected to the other side of the first folding portion, and the second folding portion is folded toward the outside of the flat tube slot, and adjacent fins can be abutted against each other through the second folding portion; the fin processing method includes: Cutting the sheet material, placing the sheet material on the mold, and trimming the edge of the sheet material; Preforming the convex bump, forming the convex bump by stamping or extrusion with a concave-convex mold; Blanking and forming, cutting off the excess sheet material along the cutter path with a cutter and forming a preliminary contour of the flanging portion; Bending and forming, sequentially bending the flanging portion along the folding line with a mold.

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