Flat tube, heat exchanger and bending method of flat tube

Abstract

A flat tube comprises a first straight part, a second straight part and a curled part which enables the first straight part and the second straight part to be connected. The first straight part, the second straight part and the curled part are formed through the same flat tube, and the curled part is twisted by at least one circle, so that the first straight part and the second straight part are located on the same side of the curled part. The bending mode is quite special, bending precision can be improved by controlling the radiuses of all arc sections in the flat tube twisting process, especially the size of the curled part in the length direction of the flat tube is reduced, and therefore the effective heat exchanging area of a heat exchanger is improved. In addition, the invention further relates to the heat exchanger with the flat tube and a bending method of the flat tube.

Description

technical field [0001] The invention relates to a flat tube, a heat exchanger and a bending method for the flat tube, belonging to the field of air conditioning systems. Background technique [0002] In recent decades, automotive air conditioners have developed rapidly, accounting for the second place in air conditioning machinery. As one of the four main components of automotive air conditioning, the heat exchanger also needs to be improved and optimized according to market requirements. Because the parallel flow heat exchanger has the characteristics of high cooling efficiency, small size, light weight, etc., it can well meet the requirements of the market, and has been gradually used in automotive air-conditioning systems in recent years. [0003] The parallel flow heat exchanger mainly includes microchannel flat tubes, cooling fins and headers. There are headers at both ends of the microchannel flat tubes for distributing and collecting refrigerant. Corrugated or louv...

AI Technical Summary

Problems solved by technology

[0008] 1. The precision of the flat tube bending process is not high, which may easily cause local deformation of the heat exchanger, damage the structure of the nearby fins, and reduce the heat exchange efficiency;

[0009] 2. The larger dimensions of the bent part of the flat tube will reduce the effective heat transfer area of ​​the heat exchanger;

[0010] 3. The bent part of the flat tube protrudes outwards (in figure 1 The position shown is protruding upwards), which affects the appearance of the product and is not conducive to installation

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