Fin for micro-tube heat exchanger

Abstract

The utility model discloses a fin for a micro-tube heat exchanger. The fin comprises a fin body, a plurality of micro-tube insertion through holes are formed in the fin body; a sleeve part extending upwards is formed on the top of the inner side wall of the micro-tube inserting through hole, and a top turnover edge which extends upwards and outwards and is bent in an arc shape is formed at the top end of the sleeve part. The contact area between the sleeve part and a heat exchange tube is increased through the sleeve part, the welding firmness and the heat exchange effect are improved, the heat exchange tube can be conveniently inserted through the top folding edge at the top of the sleeve part, welding flux can conveniently flow into the sleeve part along the top folding edge, scaling powder can conveniently flow into the sleeve part through the separation through grooves, and the welding efficiency is improved. And the sleeve part and the outer side wall of the heat exchange tube are conveniently welded and fixed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger-related equipment, and more specifically to a fin for a micro-tube heat exchanger. Background Art

[0002] A heat exchanger is generally composed of a heat exchange tube and fins fixed on the outer wall of the heat exchange tube. The refrigerant circulates in the heat exchange tube, exchanging heat with the tube wall, while the fins exchange heat with the air. The heat exchange tube and the fins are in contact and connected with each other, so the connection method between the heat exchange tube and the fin directly determines the heat exchange efficiency of the heat exchanger.

[0003] The contact connection method between the heat exchange tube and the fin is to make the heat exchange tube and the fin close to each other through physical expansion. Specifically, a full circle of flange is formed at the heat exchange tube hole of the fin. After the heat exchange tube is inserted into the heat exchange tube hole, it expands and uses the expansion force to tighten the fin and the heat exchange tube.

[0004] However, this connection method between the heat exchange tube and the fin has a high heat transfer resistance, resulting in low heat transfer efficiency, thereby affecting the heat exchange efficiency, and the stress is relatively concentrated, which is not conducive to assembly and assembly quality assurance.

[0005] Therefore, some existing methods use brazing for fixing, which requires coating solder between the fin insertion hole and the outer wall of the heat exchange tube. However, the height of the existing flange is small, so that the contact area between the inner wall and the outer wall of the heat exchange tube is small, and the welding firmness is limited. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a fin for a micro-tube heat exchanger, wherein the sleeve portion thereof increases the contact area between the sleeve portion and the heat exchange tube, thereby improving the welding firmness and the heat exchange effect, and the top folded edge at the top thereof facilitates the insertion of the heat exchange tube and also facilitates the solder to flow into the sleeve portion along the top folded edge, and the separating through grooves thereof facilitate the flux to flow into the sleeve portion, thereby improving the solder welding fixation between the inner side wall of the sleeve portion and the outer side wall of the heat exchange tube.

[0007] The solution of the utility model to solve the technical problem is:

[0008] A fin for a micro-tube heat exchanger comprises a fin body; a plurality of micro-tube plug-in through holes are formed on the fin body;

[0009] The inner side wall top of the micro-tube plug-in through hole is formed with a sleeve portion extending upward, and the top end of the sleeve portion is formed with a top folding edge extending upward and outward in an arc shape. When installing, the top end of the top folding edge is pressed against the upper fin body, thereby achieving the positioning of the distance between two adjacent fin bodies, ensuring the spacing between the two fin bodies, and making the distance between all fin bodies of the same type equal.

[0010] A partition through groove is formed at the top of the top folded edge and extends vertically toward the bottom of the top folded edge and toward the middle of the side plate of the sleeve portion.

[0011] A plurality of circular protrusions extending upward are formed on the fin body, and a micro-tube plug-in through hole is formed in the middle of the top plate of the circular protrusion.

[0012] The fin body is in the shape of a rectangular sheet.

[0013] The fin body is in a wave-shaped bending shape.

[0014] Among all the microtube plugging through holes of the fin body, half of the microtube plugging through holes are located at the front of the fin body, and half of the microtube plugging through holes are located at the rear of the fin body. The front microtube plugging through holes and the rear microtube plugging through holes are arranged alternately.

[0015] A plurality of window pieces are formed on the fin body between each two adjacent micro-tube plug-in through holes on the left and right sides, and through grooves are formed on the fin body corresponding to the window pieces.

[0016] The outstanding effects of the utility model are:

[0017] Compared with the prior art, its sleeve portion increases the contact area between it and the heat exchange tube, improves the welding firmness and the heat exchange effect, and the top folded edge at the top facilitates the insertion of the heat exchange tube and also facilitates the solder to flow into the sleeve portion along the top folded edge. The separating through groove it has can facilitate the flux to flow into the sleeve portion, thereby improving the solder welding fixation between the inner wall of the sleeve portion and the outer wall of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 yes Figure 1 AA section view;

[0020] Figure 3 It is another structural schematic diagram of the utility model;

[0021] Figure 4 yes Figure 3 AA section view. DETAILED DESCRIPTION

[0022] Example 1, see Figure 1 to Figure 2 As shown, a fin for a microtube heat exchanger includes a fin body 10; the top surface of the fin body 10 is formed with a plurality of circular protrusions 15 extending upward, the bottom surface of the fin body 10 corresponding to the circular protrusions 15 is formed with recessed holes extending upward, and a microtube plug-in through hole 11 is formed in the middle of the top plate of the circular protrusions 15.

[0023] Of all the microtube plug-in holes 11 of the fin body 10, half of the microtube plug-in holes 11 are arranged in a row at the front of the fin body 10, and half of the microtube plug-in holes 11 are arranged in a row at the rear of the fin body 10, that is, arranged in two rows of microtube plug-in holes 11, the front microtube plug-in holes 11 and the rear microtube plug-in holes 11 are arranged alternately, that is, the rear of each adjacent two microtube plug-in holes 11 at the front faces a microtube plug-in hole 11 at the rear. Of course, according to production needs, it is also possible to set multiple rows of microtube plug-in holes 11 arranged horizontally left and right on the fin body 10, such as three rows, four rows, etc.

[0024] The middle top surface of the fin body 10 between the front micro-tube plug-in through hole 11 and the rear micro-tube plug-in through hole 11 is formed with two horizontal convex strips extending left and right, and the top surfaces of the front and rear ends of the fin body 10 are formed with horizontal convex strips extending left and right, and the bottom surface of the fin body 10 corresponding to the horizontal convex strips is formed with bottom horizontal grooves extending left and right. The horizontal convex strips are used to improve the strength of the entire fin body 10.

[0025] Furthermore, the top of the inner wall of the microtube plug-in hole 11 is formed with a sleeve portion 12 extending upward (a ring-shaped inner wall surface is formed between the bottom end of the sleeve portion 12 and the top of the inner wall of the microtube plug-in hole 11. The arc-shaped extension section), and the top of the sleeve portion 12 is formed with a top flange 13 extending upward and outward in an arc shape.

[0026] The circular protrusion 15 improves the strength between the fin body 10 and the sleeve portion 12 .

[0027] Furthermore, a partitioning through groove 14 is formed at the top of the top folded edge 13 and extends vertically toward the bottom of the top folded edge 13 and toward the middle of the side plate of the sleeve portion 12 .

[0028] The top folded edge 13 is a ring-shaped folded edge extending upward from the entire top end of the sleeve portion 12. The top folded edge 13 can facilitate the insertion of the heat exchange tube into the sleeve portion 12, and is easy to install.

[0029] Furthermore, the top of the top flange 13 is formed with four dividing grooves 14 extending vertically toward the bottom of the top flange 13 and toward the middle of the side plate of the sleeve portion 12. The four dividing grooves 14 are evenly distributed on the top flange 13 and the sleeve portion 12 with the central axis of the top flange 13 as the center (two dividing grooves 14, five dividing grooves 14, etc. can also be provided as needed, and it can be designed according to production needs).

[0030] The fin body 10 is in the shape of a rectangular sheet.

[0031] A plurality of window pieces 16 are formed on the fin body 10 between each two adjacent micro-tube plug-in through holes 11 on the left and right, and through grooves are formed on the fin body 10 corresponding to the window pieces 16 .

[0032] The window piece 16 and the top surface of the fin body 10 form an angle of 30°.

[0033] The total height between the sleeve portion 12 and the top folded edge 13 in this embodiment is 1.2 mm to 3 mm (other heights may also be set as needed). During installation, multiple fin bodies 10 are inserted into the heat exchange tubes, and the outer side walls of the heat exchange tubes are closely attached to the corresponding micro-tube plug-in through holes 11. The aperture of the micro-tube plug-in through holes 11 may be 3 mm to 5 mm, and the heat exchange tubes are 2 mm to 3 mm heat exchange micro-tubes, which are located in the corresponding sleeve portion 12 and the top folded edge 13. In each adjacent two fin bodies 10, The top surface of the top folded edge 13 below it is inserted into the corresponding recessed hole of the fin body 10 above, and the top surface of the top folded edge 13 is pressed against the top surface of the edge of the corresponding recessed hole, and the outer wall of the top folded edge 13 is tightly against the inner wall of the corresponding recessed hole to achieve pressure limiting, so that the distance between each adjacent two fin bodies 10 can be guaranteed to be certain, and the distance between all fin bodies 10 can be guaranteed, so that the wind in the heat exchanger can flow normally and evenly from the space between all fin bodies 10 to ensure the heat exchange effect.

[0034] At the same time, after the heat exchange tube and the fin body 10 are installed, they can be placed in a tunnel furnace for brazing. The outer wall surface of the heat exchange tube used in this embodiment is coated with solder. Therefore, after the installation is completed, it is necessary to spray flux on the surface. Then, when it enters the tunnel furnace for brazing, the solder on the outer wall surface of the heat exchange tube and the sprayed flux will melt and flow, and then enter between the sleeve portion 12, the top folded edge 13 and the outer wall of the heat exchange tube to achieve welding;

[0035] The top of the top folded edge 13 is formed with four dividing grooves 14 extending vertically toward the bottom of the top folded edge 13 and toward the middle of the side plate of the sleeve portion 12, which can facilitate the flow of molten solder and flux and enter the inner wall of the top folded edge 13 and the sleeve portion 12 along the dividing grooves 14, so that the outer wall of the heat exchange tube and the inner wall of the top folded edge 13 and the sleeve portion 12 are firmly welded.

[0036] The window piece 16 and the top surface of the fin body 10 form an angle of 30 degrees, so that the wind entering between the two fin bodies 10 can be blocked by the window piece 16 to achieve turbulence, thereby increasing the air flow time at the fin body 10 and improving the heat exchange effect.

[0037] Example 2, see Figure 3 to Figure 4As shown, the fin body 10 is in a wave-shaped bending shape, and the rest is the same as Example 1. The fin body 10 is in a wave-shaped bending shape to increase the wind entering between the two fin bodies 10 and be blocked by the wavy wall to achieve turbulence, thereby increasing the air flowing time in the fin body 10 and improving the heat exchange effect.

[0038] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The scope of patent protection of the present invention should be limited by the claims.

Claims

1. A fin for a micro-tube heat exchanger, comprising a fin body (10); characterized in that: The fin body (10) is formed with a plurality of micro-tube plug-in through holes (11); The top of the inner wall of the micro-tube plug-in through hole (11) is formed with a sleeve portion (12) extending upward, and the top of the sleeve portion (12) is formed with a top folded edge (13) extending upward and outward in an arc shape; The top of the top folded edge (13) is formed with a plurality of partitioning through grooves (14) extending vertically toward the bottom of the top folded edge (13) and toward the middle of the side plate of the sleeve portion (12).

2. The fin for a micro-tube heat exchanger according to claim 1, characterized in that: The top folded edge (13) is a ring-shaped folded edge extending upward from the entire top end of the sleeve portion (12).

3. The fin for a micro-tube heat exchanger according to claim 1, characterized in that: The top of the top folded edge (13) is formed with four dividing through grooves (14) extending vertically toward the bottom of the top folded edge (13) and toward the middle of the side plate of the sleeve portion (12); the four dividing through grooves (14) are evenly distributed on the top folded edge (13) and the sleeve portion (12) with the central axis of the top folded edge (13) as the center.

4. The fin for a micro-tube heat exchanger according to claim 1, characterized in that: The fin body (10) is formed with a plurality of circular protrusions (15) extending upwards, and a microtube plug-in through hole (11) is formed in the middle of the top plate of the circular protrusion (15).

5. The fin for a micro-tube heat exchanger according to claim 1, characterized in that: The fin body (10) is in the shape of a rectangular sheet.

6. The fin for a micro-tube heat exchanger according to claim 1, characterized in that: The fin body (10) is in a wave-shaped bending shape.

7. The fin for a micro-tube heat exchanger according to claim 1, characterized in that: Of all the microtube plug-in through holes (11) of the fin body (10), half of the microtube plug-in through holes (11) are located at the front of the fin body (10) and arranged in a row, and half of the microtube plug-in through holes (11) are located at the rear of the fin body (10) and arranged in a row, and the front microtube plug-in through holes (11) and the rear microtube plug-in through holes (11) are arranged alternately.

8. The fin for a micro-tube heat exchanger according to claim 7, characterized in that: A plurality of window pieces (16) are formed on the fin body (10) between each two adjacent micro-tube plug-in through holes (11) on the left and right, and through grooves are formed on the fin body (10) corresponding to the window pieces (16).

9. The fin for a micro-tube heat exchanger according to claim 8, characterized in that: The window piece (16) and the top surface of the fin body (10) form an angle of 30°.

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