Heat exchanger

Abstract

The invention discloses a heat exchanger which comprises a collecting pipe, flat tubes, a fin and a refrigerant distribution device; the flat tubes are distributed in the length direction of the collecting pipe; the fin is positioned between the two lines of flat tubes; the refrigerant distribution device comprises a liquid distribution pipe and a baffle; the baffle is arranged in the length direction of the collecting pipe and divides the interior of the collecting pipe into an upper cavity and a lower cavity; the flat tubes are inserted in the upper cavity of the collecting pipe; the liquid distribution pipe is inserted in the lower cavity of the collecting pipe and penetrates through the collecting pipe in the length direction of the collecting pipe; a liquid outlet allowing a refrigerant to be fed into the lower cavity is formed in the side wall of the liquid distribution pipe; a flowing clearance is formed between one side in the width direction of the baffle at least and the pipe wall of the collecting pipe; the refrigerant flows out through the liquid outlet and enters the upper cavity through the flowing clearance. After flowing through the liquid outlet, the refrigerant is well mixed in the lower cavity and then enters the upper cavity through the flowing clearance, so that the technical problem in the prior art that a perforated plate or a perforated pipe is used, and after the refrigerant flows out through the perforated plate, secondary liquid distribution is non-uniform can be solved. The invention is applied to the field of air-conditioning heat exchangers.

Description

【Technical Field】 [0001] The invention is applied to the field of air-conditioning heat exchangers, and specifically relates to a heat exchanger. 【Background technique】 [0002] Such as figure 1 As shown, the US patent application with publication number US_20100089559_A1 discloses a method of inserting a distribution pipe in the collector to solve the problem of refrigerant distribution. The distribution pipe is provided with small holes, and the refrigerant passes through the distribution pipe and then passes through the small holes. Outflow, but due to the inertia of the refrigerant flow, the flow of the small holes near the inlet side will be affected by the inertia of the refrigerant flowing backwards and will be smaller than the flow of the next few small holes. The smaller the pipe diameter, the greater the flow rate. The greater the influence of inertia, and the limitation of processing cost, the number of small holes on the distribution pipe is limited. After the refrige...

AI Technical Summary

Problems solved by technology

[0002] like figure 1 As shown, in the U.S. patent application with the publication number US_20100089559_A1, a method of inserting a distribution pipe in the header is disclosed to solve the problem of refrigerant distribution. However, due to the inertia of the refrigerant flow, the flow rate of several small holes near the inlet side will be affected by the backward flow inertia of the refrigerant and will be smaller than the flow rate of the subsequent small holes. The smaller the pipe diameter, the greater the flow rate, so The greater the impact of inertia, and the limitation of processing costs, the number of small holes on the distribution pipe is limited, and it is difficult for the refrigerant to flow into each flat pipe evenly after flowing out of the small holes, and there is a problem of uneven secondary distribution.

In the Chinese patent document with the application number CN200910002438.2, it is disclosed that a porous plate is inserted into the collecting pipe to separate the collecting pipe into upper and lower cavities, such as figure 2 As shown, due to the large volume of the cavity under the header, the refrigerant flow rate is low and the inertial effect is small, but the flow rate at the inlet is relatively high, so the refrigerant flow rate at the small hole near the inlet is small, and the porous plate The small holes are facing the flat tube, and because of the limited number of small holes, there is also the problem of uneven secondary liquid separation after the refrigerant flows out of the perforated plate

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