Microchannel heat exchanger and manufacturing method thereof

Abstract

The invention discloses a microchannel heat exchanger and a manufacturing method thereof. The microchannel heat exchanger comprises a plurality of flat pipes which are communicated with a flow collection pipe; a middle passage is formed in each flat pipe; fins are arranged between flat pipes; a distribution pipe is arranged in the flow collection pipe; the side wall of the distribution pipe is provided with distribution holes which are communicated with the inner cavity of the flow collection pipe; a first end of the flow collection pipe is provided with a first end plate which is provided with an assembly hole; a first end port of the distribution pipe passes through the assembly hole; the first end port and the assembly hole are fixed and sealed through welding; the first end port of the distribution pipe is plugged through a plug or a cover; the first end port is fixed and sealed with the plug or the cover through welding; the external diameter of the distribution pipe which is inserted into the assembly hole is a fixed value; and the aperture of the assembly hole is a fixed value. The manufacturing method can greatly improve the processing efficiency of the microchannel heat exchanger, and the microchannel heat exchanger has the characteristics of simple and reasonable structure, low manufacturing cost and the like, and can be operated flexibly and distribute flow uniformly, stably and reliably.

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 been widely concerned and applied. [0003] In order to improve the uniform fluidity of the heat exchange working 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 working medium is divided through the holes on the distribution pipe. Improve the uniformity of the heat exchange working medium entering the flat tube in the microchannel heat exchanger. [0004] see figure 1 , the existing microchannel 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 end The ...

AI Technical Summary

Problems solved by technology

[0004] see figure 1 , the existing microchannel 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 end The positioning hole 11 in the plate 10 passes through and is welded together with it. 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 arm The suspension structure has a tendency to sag due to the influence of 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, which is more serious. Eliminates 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

Images