A special-shaped air conditioning heat exchanger structure

Abstract

The present invention discloses a special-shaped air conditioner heat exchanger structure, comprising a group of heat exchange fins arranged in a stacked manner and a group of heat exchange tubes inserted in the heat exchange fins. After the heat exchange fins and the heat exchange tubes are assembled, they are bent at least at one place to form a bent portion. When the heat exchange fins are stacked, the fin pitch of the heat exchange fins at the position of the bent portion is greater than the fin pitch of other heat exchange fins, so that the heat exchange amount of the bent portion is kept consistent with that of other positions after the heat exchange fins are bent. The heat exchange fins include a fin body, a fin hole for inserting the heat exchange tube on the fin body, and a flange is provided on the top of the fin hole. The present invention can increase the heat exchange gap of the bent portion of the heat exchanger fin, thereby effectively solving the problem of frosting and overheating of the bent portion, and the present invention can achieve higher precision processing and continuous production, and can be widely used in the field of heat exchangers and their processing.

Description

Technical Field

[0001] The invention relates to the field of air-conditioning heat exchangers, and in particular to a special-shaped air-conditioning heat exchanger structure. Background Art

[0002] With the increase in the shape of air conditioners, the heat exchanger structure inside the air conditioner also needs to be adjusted from the original flat structure to a special-shaped structure with a bend. At present, in the processing of heat exchanger fins of heat exchangers, progressive dies are used for continuous processing, and then they are cut into strips. The heat exchanger fins after strips are stacked together for tube threading (heat exchange tubes), and then bent, and finally formed into the required heat exchanger shape. Then in the actual use of air conditioners, it was found that the bends of the heat exchanger often have problems of freezing, frost and overheating, which greatly affects the heat exchange efficiency of the heat exchanger, the energy efficiency ratio of the entire system and the service life of the heat exchanger. According to research, the main reason is that after the heat exchanger fins are bent, the fin gap in this area becomes smaller and the wind resistance increases. Because when stacked, the gaps of all heat exchangers are consistent, and bending will inevitably lead to smaller gaps at the bends, which will cause the heat exchange speed at this position to be slow and frost or overheating will occur. To this end, the existing heat exchanger structure needs to be adjusted to ensure the heat exchange efficiency at the bend. At the same time, high-speed continuous processing of fins can be achieved without manually selecting fins with different fin pitches for combination, which will not affect the efficiency of production and processing. Summary of the invention

[0003] The purpose of the present invention is to provide a special-shaped air-conditioning heat exchanger structure to solve the problem that frosting or excessive temperature easily occurs at the bending part of the existing special-shaped air-conditioning heat exchanger due to the small heat exchange gap.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a special-shaped air conditioner heat exchanger structure, comprising a group of heat exchange fins arranged in a stacked manner and a group of heat exchange tubes inserted in the heat exchange fins, wherein the heat exchange fins and the heat exchange tubes are bent at least at one place after being assembled to form a bent portion, and when the heat exchange fins are stacked, the fin pitch of the heat exchange fins at the position of the bent portion is greater than the fin pitch of other heat exchange fins, so that the heat exchange amount of the bent portion is kept consistent with that of other positions after the heat exchange fins are bent; the heat exchange fins comprise a fin body, a fin hole arranged on the fin body for inserting the heat exchange tube, and a flange is arranged on the top of the fin hole;

[0005] The flanging is completed by flanging sub-die processing, and the flanging sub-die includes a flanging punch fixing plate, a flanging punch fixedly arranged on the flanging punch fixing plate, a flanging die cooperating with the flanging punch, the flanging die is fixedly arranged on the die fixing plate, and an upper inclined wedge, a middle inclined wedge and a lower inclined wedge cooperating with each other are arranged below the die fixing plate, the middle inclined wedge is connected with a manual adjustment screw, and the lower inclined wedge is connected with an automatic adjustment screw, and one end of the automatic adjustment screw is connected with a servo motor, and the servo motor can complete the adjustment of the height of the die fixing plate without stopping the fin processing.

[0006] In order to ensure the consistency of the heat exchange amount at each position of the bent portion after bending, the fin spacing of the heat exchange fins of the bent portion is first gradually increased and then gradually decreased when being stacked.

[0007] In order to improve the processing accuracy of the fin holes and thus ensure the gap between the heat exchange fins, the processing procedures of the fin holes are multi-step extension, thinning and stretching, punching, and flanging.

[0008] Correspondingly, the multi-step extension station is provided with an extension sub-mold, the thinning and stretching station is provided with a thinning and stretching sub-mold, and the punching station is provided with a punching sub-mold.

[0009] Beneficial effects of the present invention: The present invention increases the gap between the heat exchange fins of the bending part when the heat exchange fins are superimposed, thereby ensuring that the same heat exchange capacity as other areas can be achieved when the gap between the fins of the bending part is reduced after bending, thereby solving the problems of frost and overheating at the bending part. In order to achieve continuous production and processing when the fin gaps are inconsistent, a combined inclined wedge is provided on the flanging sub-mold. The manual adjustment screw of the middle inclined wedge is used to adjust the height of the flanging when the mold is stopped, and a rough adjustment is performed. Then the lower inclined wedge is adjusted by a servo motor. The servo motor can accurately control the height of the flanging and fine-tune the height of the flanging, thereby achieving accurate adjustment and control of the fin height; and the servo motor can achieve rapid adjustment, thereby satisfying the requirement of fine-tuning the height of the flanging without stopping the mold, thereby not affecting the speed of fin processing. In order to further improve the processing accuracy of the fin holes and obtain the required height, the traditional processing technology was changed in the fin hole processing, from the original punching and then thinning and stretching to thinning and stretching first and then punching. This can effectively avoid the problem of thinning and stretching after punching, which will cause height difference in the fin holes and ensure the processing accuracy of the fin holes.

[0010] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the stacking of fins before bending of the heat exchanger in the present invention.

[0012] Figure 2 It is a schematic diagram of the structure of the heat exchanger after bending in the present invention.

[0013] Figure 3 It is a schematic diagram of the structure of the heat exchange fins in the present invention.

[0014] Figure 4 It is a structural schematic diagram of the flanging sub-mold in the present invention.

[0015] Figure 5 It is a structural schematic diagram of the fin hole forming mold in the present invention. DETAILED DESCRIPTION

[0016] Examples, such as Figure 2 , Figure 3 As shown, a special-shaped air conditioner heat exchanger structure includes a group of heat exchange fins 1 stacked and a group of heat exchange tubes 2 inserted in the heat exchange fins 1. After the heat exchange fins 1 and the heat exchange tubes 2 are assembled, they are bent at least at one place to form a bent portion 3, as shown in FIG. Figure 1 As shown, when the heat exchange fins 1 are stacked, the fin pitch h of the heat exchange fins 1 at the position of the bending portion 3 is greater than the fin pitch H of other heat exchange fins 1, so that after bending this part of the heat exchange fins 1, the heat exchange amount of the bending portion 3 is consistent with that of other positions, thereby effectively solving the problem of frost or overheating at the bending position. More precisely, the fin pitch of the heat exchange fins 1 at the bending portion 3 gradually increases and then gradually decreases when stacked, that is, the heat exchange fins 1 located in the middle of the bending portion 3 have the largest fin pitch when stacked. The heat exchange fin 1 includes a fin body 11, a fin hole 12 is arranged on the fin body 11 for inserting the heat exchange tube 2, a flange 121 is arranged on the top of the fin hole 12, the fin hole 12 is a countersunk hole structure, and a sink 122 is arranged at the bottom of the fin hole 12. When the heat exchange fins 1 are stacked, the sink 122 of the fin hole 12 of the upper heat exchange fin is supported on the flange 121 of the fin hole 12 of the lower heat exchange fin, so the spacing between two adjacent heat exchange fins 1 is controlled by the height of the fin hole 12. The height of the fin hole 12 mainly depends on the forming height and flange height of the fin hole 12, so during processing, the fin spacing can be adjusted by accurately controlling the forming height of the fin hole and then adjusting the flange height.

[0017] In order to achieve the above-mentioned fin processing and forming requirements and at the same time meet high-speed continuous processing and production, the present invention improves the accuracy of the fin hole forming height by adjusting the order of fin hole forming, and realizes precise online adjustment of the fin hole flanging height through the design and adjustment of the flanging sub-mold, thereby meeting the processing requirements of special-shaped air-conditioning heat exchangers.

[0018] like Figure 5As shown, the processing steps of the fin hole 12 are multi-step extension a, thinning and stretching b, punching c, and flanging d. Correspondingly, the multi-step extension a station is provided with an extension sub-mold 5, the thinning and stretching b station is provided with a thinning and stretching sub-mold 6, the punching c station is provided with a punching sub-mold 7, and the flanging d station is provided with a flanging sub-mold 4. The fin is thinned and stretched after multi-step extension, and then punched and flanging are performed. Here, by adjusting the order of thinning and stretching b and punching c, the original punching first and then thinning and stretching is adjusted to thinning and stretching first and then punching. The advantage after adjustment is that during thinning and stretching, since the top of the fin hole is a continuous sheet, the sheets on the top of the fin hole can flow with each other during thinning and stretching, thereby ensuring the consistency of the height of the top of the fin hole along the circumferential direction. In the traditional method of punching first and then thinning and stretching, the sheet on the inner wall of the fin hole can only flow along one side during thinning and stretching. The material on the inner wall of the fin hole cannot flow laterally under the action of the empty hole at the top. Therefore, there may be a problem of height difference at the top of the fin hole, thereby affecting the height of the fin hole forming. The present invention can solve the problem of height difference at the top of the fin hole well by adjusting the process, and improve the accuracy of the fin forming height. The specific structures of the extension sub-mold 5, the thinning and stretching sub-mold 6 and the punching sub-mold 7 described in the present invention are consistent with the existing design and are existing structures, so they are not described in detail here.

[0019] like Figure 4 As shown, the flanging 121 is processed by the flanging sub-die 4, and the flanging sub-die 4 includes a flanging punch fixing plate 41, a flanging punch 42 fixedly set on the flanging punch fixing plate 41, and a flanging die 43 matched with the flanging punch 42, and the flanging die 43 is fixedly set on the die fixing plate 44. In order to facilitate the adjustment of the initial height of the flanging die 43, thereby changing the position of the flanging punch 42 acting on the fin hole, so as to obtain flangings of different heights, the lower part of the die fixing plate 44 is provided with an upper inclined wedge 45, a middle inclined wedge 46 and a lower inclined wedge 47 that cooperate with each other. The upper inclined wedge 45, the middle inclined wedge 46 and the lower inclined wedge 47 are all composed of a group of sub-oblique wedges spliced ​​with each other. The specific structure can refer to the patent application number 201821858813.4, which is named as an inclined wedge structure involved in a fin punching die with adjustable height. The middle inclined wedge 46 is connected with a manual adjustment screw 48, which is adjusted when the mold is stopped so that the height of the flange obtained by processing meets the fin gap requirement of the non-bending part of the air conditioner heat exchanger. The lower inclined wedge 47 is connected with an automatic adjustment screw 49, and one end of the automatic adjustment screw 49 is connected with a servo motor 410. The servo motor 410 can adjust the height of the die fixing plate 44 without stopping the fin processing. This structure can quickly adjust the flange height when the mold is continuously operated, with a short adjustment time and high precision. Therefore, it can be adjusted when the upper mold and the lower mold are separated, and the adjustment can be completed before the upper mold and the lower mold cooperate to flange again.

[0020] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A special-shaped air conditioner heat exchanger structure, comprising a group of heat exchange fins (1) arranged in a stacked manner and a group of heat exchange tubes (2) inserted into the heat exchange fins (1), characterized in that: After the heat exchange fins (1) and the heat exchange tubes (2) are assembled, they are bent at least at one place to form a bent portion (3); when the heat exchange fins (1) are stacked, the fin pitch of the heat exchange fins (1) at the position of the bent portion (3) is greater than the fin pitch of other heat exchange fins (1), so that after the heat exchange fins (1) are bent, the heat exchange amount of the bent portion (3) remains the same as that of other positions; the heat exchange fins (1) comprise a fin body (11), a fin hole (12) provided on the fin body (11) for inserting the heat exchange tube (2), and a flange (121) is provided at the top of the fin hole (12); The flanging (121) is completed by flanging sub-die (4), the flanging sub-die (4) comprising a flanging punch fixing plate (41), a flanging punch (42) fixedly arranged on the flanging punch fixing plate (41), a flanging die (43) matched with the flanging punch (42), the flanging die (43) fixedly arranged on a die fixing plate (44), an upper inclined wedge (45), a middle inclined wedge (46) and a lower inclined wedge (47) matched with each other are arranged below the die fixing plate (44), the middle inclined wedge (46) is connected with a manual adjustment screw (48), the lower inclined wedge (47) is connected with an automatic adjustment screw (49), one end of the automatic adjustment screw (49) is connected with a servo motor (410), and the height of the die fixing plate (44) can be adjusted by the servo motor (410) without stopping the fin processing.

2. The special-shaped air conditioning heat exchanger structure according to claim 1, characterized in that: When the heat exchange fins (1) of the bent portion (3) are stacked, the distance between the fins first gradually increases and then gradually decreases.

3. The special-shaped air conditioning heat exchanger structure according to claim 1, characterized in that: The processing steps of the fin hole (12) are multi-step extension (a), thinning and stretching (b), punching (c), and flanging (d).

4. The special-shaped air conditioning heat exchanger structure according to claim 3, characterized in that: The multi-step extension (a) station is provided with an extension sub-mold (5), the thinning and stretching (b) station is provided with a thinning and stretching sub-mold (6), and the punching (c) station is provided with a punching sub-mold (7).

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