Microchannel heat exchanger and method of making the same

Abstract

A micro-channel heat exchanger and a manufacturing method thereof. The micro-channel heat exchanger includes a plurality of flat tubes communicated with a header, an intermediate channel is arranged inside the flat tubes, fins are arranged between the flat tubes, and the collector A distribution pipe is arranged in the pipe, and a distribution hole communicating with the inner chamber of the collecting pipe is provided on the side wall of the distribution pipe; a first end plate is provided on the first end of the collecting pipe, and a protruding The protruding part protrudes into the first port of the distribution pipe during assembly; the protruding part and the inner wall of the first port are welded, fixed and sealed. The profile of the protrusion matches the profile of the inner wall of the first port. The cross-section of the protrusion is conical or truncated-conical, or the cross-section of the protrusion is cylindrical. The manufacturing method provided by the invention can greatly improve the processing efficiency of the microchannel heat exchanger, and at the same time ensure the firmness of the microchannel heat exchanger, which has the advantages of simple and reasonable structure, flexible operation, low manufacturing cost, uniform flow distribution and Stable and reliable features.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a microchannel heat exchanger and a manufacturing method thereof. Background technique [0002] As a new type of heat exchanger, microchannel heat exchanger has received more and more attention and application. [0003] In order to improve the uniform fluidity of the heat exchange medium in the microchannel heat exchanger, the structure of inserting the distribution pipe into the header of the microchannel heat exchanger is often adopted, and the heat exchange work is divided through the holes on the distribution pipe. quality, and improve the uniformity of the flat tube in the heat exchanger in which the heat exchange working medium enters the microchannel. [0004] see figure 1 , the existing micro-channel heat exchanger includes a header 1, a flat tube 2, a fin 3, a first end plate 4, a distribution pipe 9, a second end plate 10, etc. It can be seen that the distribution pipe 9 starts fro...

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Problems solved by technology

[0004] see figure 1 , the existing micro-channel heat exchanger includes a header 1, a flat tube 2, a fin 3, a first end plate 4, a distribution pipe 9, a second end plate 10, etc. It can be seen that the distribution pipe 9 starts from the second The positioning hole 11 in the end plate 10 passes through and is welded as a whole. The distribution pipe 9 is provided with a plurality of distribution holes 8. The first port 5 of the distribution pipe 9 is open and not fixedly connected, forming a single The arm suspension structure has a tendency to sag due to the gravity of the distribution pipe 9 itself. At the same time, the flow rate of the heat exchange medium is relatively fast, and the heat exchange medium mixed with gas and liquid makes the force on the distribution pipe 9 uneven and more severe. Intensifies the instability of the single-arm suspension structure, which is prone to vibration and noise

Since the first port 5 of the distribution pipe 9 is open, and when the heat exchange working medium enters the distribution pipe 9, a relatively large flow rate will be formed at the first port 5 of the distribution pipe 9, causing the heat exchange working medium there to The flow rate of the heat exchange medium is greater than that of the heat exchange medium flowing out from the distribution hole 8, resulting in an unbalanced flow of the heat exchange medium

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