All aluminum pipe finned parallel flow heat exchanger and production method thereof

Abstract

The invention discloses an all aluminum pipe finned parallel flow heat exchanger comprising a collecting pipe, a fin and a cold refrigerant pipe, wherein at least the contact part of the collecting pipe, the fin or the cold refrigerant pipe is made of composite aluminum; and the melting point temperature of a composite aluminum surface layer is lower than that of a base layer. The cold refrigerant pipe is provided with an inner fin; the fin with a through hole edgefold is sleeved on the cold refrigerant pipe; two ends of the cold refrigerant pipe are inserted into a flanging hole of the collecting pipe; and the internal space of the cold refrigerant pipe is communicated with the internal space of the collecting pipe. After the collecting pipe, the fin and the cold refrigerant pipe are assembled, the overall all aluminum pipe finned parallel flow heat exchanger is heated to the temperature between the melting point temperature of the composite aluminum surface layer and the melting point temperature of the base layer; the surface layer is smelted and plays the role of brazing solders; and the all aluminum pipe finned parallel flow heat exchanger and accessories thereof are welded into a whole. The industrial production of the all aluminum pipe finned parallel flow heat exchanger can be realized, the welding quality is consistent, the welding is easy to control, the automatic assembly of the heat exchanger can be realized, and the consistency of long-term usage performance of the heat exchanger is kept.

Description

technical field [0001] The invention relates to a parallel flow heat exchanger, in particular to an all-aluminum tube-fin parallel flow heat exchanger. Background technique [0002] The parallel flow heat exchanger is easy to optimize the distribution of refrigerant flow and heat transfer characteristics, and has high heat exchange efficiency. The existing parallel flow heat exchanger mostly adopts plate-fin structure, and its heat exchange unit is as follows: figure 1 As shown, the heat exchanger composed of these heat exchange units is as follows figure 2 As shown, the heat exchanger composed of plate-fin heat exchange unit has the existence of "plate" (usually the flat side of the microchannel flat tube), so that the condensed water on the air side cannot be smoothly discharged downward, which affects the heat exchange efficiency. If the heat exchanger is used as the outdoor side heat exchanger in the air conditioner, ice blockage will easily occur under low temperatur...

AI Technical Summary

Problems solved by technology

CN101029808 discloses a circular tube parallel flow heat exchanger. The heat exchanger only uses circular tubes instead of flat tubes, and still uses folded fins. The condensed water is still difficult to drain downward due to the obstruction of the fins.

CN102032718A discloses a parallel-flow finned heat exchanger, which only provides an overall technical solution and does not fully disclose the structural scheme of the parallel-flow finned heat exchanger

[0007] Parallel flow heat exchangers can be made of all aluminum and have high heat transfer efficiency, and are easy to optimize the distribution of refrigerant flow and heat transfer characteristics. In recent years, major household air conditioner manufacturers in my country have unanimously carried out research on parallel flow heat exchangers. Gree Electric Appliances Co., Ltd. In 2006, it applied for a Chinese patent. Hisense Kelon and Guangdong Midea started to apply for related patents in 2008 and 2009 respectively. However, their research all used plate-fin parallel flow heat exchangers. Due to the difficulty in solving the problem of ice blockage, It is mostly used in air-conditioning indoor evaporators. So far, there have been no public documents and product samples of all-aluminum tube-fin parallel flow heat exchangers.

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