Novel micro-channel flat pipe machined by roll-bending brazing process

Abstract

The invention provides a novel micro-channel flat pipe machined by a roll-bending brazing process. The micro-channel flat pipe is formed from a composite plate by means of a plurality of times of bending formation by using the roll-bending brazing process; a plurality of micro-channels extending linearly along the longitudinal direction are arranged in sequence on the micro-channel flat pipe and in the width direction of the micro-channel flat pipe. The composite plate is an aluminum alloy cascaded layer which is a composite structure comprising three layers or more than three layers, wherein the aluminum alloy cascaded layer sequentially comprises a brazing material layer, an anticorrosive layer and a base layer. According to the novel micro-channel flat pipe provided by the invention, the hole type of the micro-channels is improved and is transformed from a Chinese character Ji-shaped hole into a wave-shaped hole; after the hole type is transformed into the wave-shaped hole, a micro-channel flat pipe with 14 to 22 holes can be obtained under the same outline dimension.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a novel microchannel flat tube processed by a roll bending brazing process. Background technique [0002] As the core element of heat exchanger, microchannel flat tube is widely used in various automobiles and household air conditioners. At present, the most widely used micro-channel flat tube is obtained by extrusion process. Due to the characteristics of the process, the extrusion-molded micro-channel flat tube has poor corrosion resistance, high cost of molds, and high cost of production equipment such as extrusion machines. [0003] After searching the existing technology, it is found that the patent document with the application number CN203190861U discloses a microchannel flat tube of a new technology. It has a great impact on brazing and is prone to desoldering; on the other hand, the "several"-shaped holes limit the increase in the number of holes in the microchannel flat tube, thereb...

AI Technical Summary

Problems solved by technology

At present, the most widely used micro-channel flat tube is obtained by extrusion process. Extruded micro-channel flat tube is determined by the characteristics of the process, its corrosion resistance is poor, the cost of mold is high, and the cost of production equipment such as extrusion machine is high.

[0003] After searching the existing technology, it is found that the patent document with the application number CN203190861U discloses a new type of micro-channel flat tube. It has a great impact on brazing and is prone to desoldering; on the other hand, the "several"-shaped holes limit the increase in the number of holes in the microchannel flat tube, thereby affecting the improvement of heat transfer efficiency and pressure bearing capacity

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