Additive manufacturing annular micro-channel heat exchanger and machining method thereof

Abstract

The invention provides an additive manufacturing annular micro-channel heat exchanger and a machining method thereof. The additive manufacturing annular micro-channel heat exchanger comprises a plurality of additive manufacturing micro-channel heat exchanger units, and the multiple micro-channel heat exchanger units are connected with one another through wall surfaces to form an integral annular heat exchanger; each micro-channel heat exchanger unit is provided with a plurality of cold fluid flow channels and hot fluid flow channels which are alternately stacked, and the cold fluid flow channels and the hot fluid flow channels exchange heat through heat exchange wall faces. And a gas collection cavity of the heat exchanger is embedded into the heat exchange channel. The additive manufacturing heat exchanger overcomes the related technical problems of a current micro-channel heat exchanger, and has the advantages of being high in heat transfer performance, low in flow resistance, resistant to high pressure strength and light in weight.

Description

technical field [0001] The invention relates to the field of heat exchangers, in particular to a modular additive manufacturing annular microchannel heat exchanger and a processing method thereof, which can be applied to aero-engines and gas turbines. Background technique [0002] For microchannel heat exchangers with high pressure and high temperature resistance, printed circuit board heat exchangers are commonly used at present. The heat exchanger etches micro-channels on the surface of metal plates such as stainless steel by etching process, and welds the multi-layer metal plates together by diffusion welding process to form the printed circuit board heat exchanger body, and diffusion-welds the inlet pipe and the outlet pipe respectively on the heat exchanger body. The problems of this heat exchanger are: 1. The etching process has high pollution to the polluted environment and is harmful to human health, and the processing cost is high; The thermal performance is not h...

AI Technical Summary

Problems solved by technology

The problems of this heat exchanger are: 1. The etching process has high pollution to the polluted environment and is harmful to human health, and the processing cost is high; The thermal performance is not high; 3. The back of the heat exchange plate is smooth to ensure the contact diffusion welding with the fins of the lower heat exchange plate; 3. The heat exchange plate etched with microchannels is thicker to ensure that the etching will not penetrate the bottom wall; the fins It is thicker to obtain better welding quality with the adjacent heat exchange wall, but it brings the disadvantages of large flow resistance and large dead weight of the printed circuit board heat exchanger; 4. The top of the microchannel fins of each heat exchange plate The surface is slender, and the welding quality with the adjacent heat exchange plate wall cannot be guaranteed, which affects the heat transfer performance and mechanical strength of the heat exchanger

5. In the current processing of printed circuit board heat exchangers, the inlet and outlet headers need to be welded to different sides of the heat exchanger core separately. The processing procedure is complicated and the processing efficiency is low, which also brings strength reduction, thermal stress concentration and The problem of corrosion resistance; and the arrangement of the inlet and outlet headers of the current printed circuit board heat exchanger cannot be processed into an annular heat exchanger, and cannot adapt to the structure of the airflow flowing in the annular channel in turbine power devices such as aero engines and gas turbines features

However, the above scheme has many problems such as limited heat transfer performance of the heat exchange plate channel, low processing efficiency and high processing cost.

[0004] Conventional additive manufacturing equipment has the limitation that it cannot process heat exchangers with large-scale shapes at one time, and the processing efficiency and reliability of larger heat exchangers manufactured by additive manufacturing are very low

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