Flat tube manufacturing method of microchannel heat exchanger

Abstract

The invention relates to a method for processing a flat tube of a microchannel heat exchanger which is composed of an inlet pipe, a microchannel flat tube bundle, a collecting pipe, fins and an outlet pipe, wherein the microchannel flat tube bundle is composed by a plurality of flat tubes side by side, and each flat tube is composed of a saw-tooth pipe wall and a saw-tooth hydraulic power channel. The method for processing the flat tube comprises the following steps: a) casting, pouring fused aluminium ingot in a flat tube cover die formed by an outer die and an inner die, the inner die including a flusible layer and a soft model layer; b) cooling and sizing; c) removing the die, electrifying thermal fuse in the flusible layer of the inner die so as to fuse and discharge the flusible layer, extracting the soft model layer and opening the outer die. The flat tube of the microchannel heat exchanger provided by the invention adopts a fused die casting method, the product precision is high, production efficiency is high and waste ratio is low.

Description

technical field [0001] The invention relates to the field of heat exchange equipment, in particular to a flat tube processing method for a microchannel heat exchanger. Background technique [0002] Microchannel refers to a channel of any cross-sectional shape with a single channel equivalent diameter (hydraulic diameter) below 3mm. It is used in refrigeration / air conditioning devices or systems. Finned tube heat exchangers with porous flat tubes as the basic tube type are called microchannels. channel heat exchanger. The microchannel heat exchanger in the prior art is generally composed of microchannel flat tube bundles, fins, side plates, collecting pipes, inlet and outlet pipes, etc., and is generally welded by integral welding. Such as figure 2 The end faces of the flat tubes used in the microchannels shown in the prior art are arranged with holes, and the overall appearance of the porous flat tubes is flat, and a plurality of heat exchange pipes with flow channels of a...

AI Technical Summary

Problems solved by technology

Taking the heat exchanger as a condenser as an example, the refrigerant is in advective state between the flat tube-shaped refrigerant channels without disturbance, and the fluid in contact with the tube wall is first condensed into a liquid phase, and then surrounds the refrigerant without a gas phase, resulting in Refrigerant heat exchange is poor

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