Microchannel heat exchanger

Abstract

The invention provides a microchannel heat exchanger. The microchannel heat exchanger comprises two headers and a plurality of flat tubes, wherein the plurality of flat tubes vertically communicate between the two headers, the two ends of the flat tubes further communicate with a plurality of connecting pieces used for connecting the two headers, and the diameter of the header connected with one ends of the connecting pieces is smaller than the width of the flat tubes connected with the other ends of the connecting pieces. The microchannel heat exchanger not only can improve the flow rate of arefrigerant in the headers, but also enable the refrigerant entering the flat tubes to be more uniform, so that the performance of the heat exchanger is improved and the filling amount of the refrigerant is reduced.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a microchannel heat exchanger. Background technique [0002] The inner diameter of the header of the traditional microchannel heat exchanger must be larger than the width of the flat tube to complete the assembly, so the inner space of the header is larger, which will reduce the flow rate of the refrigerant in the header, resulting in the refrigerant gas-liquid when the heat exchanger is used as an evaporator. Stratification, uneven liquid separation when entering the flat tube, reduces the performance of the heat exchanger, and increases the refrigerant charge at the same time. [0003] The patent CN103245132B discloses a microchannel heat exchanger that is beneficial to reduce the amount of refrigerant charge, and provides a way to rotate the end of the flat tube by 90° and then insert it into the header, thereby reducing the diameter of the header and reducing the amou...

AI Technical Summary

Problems solved by technology

[0002] The inner diameter of the header of the traditional microchannel heat exchanger must be larger than the width of the flat tube to complete the assembly, so the inner space of the header is larger, which will reduce the flow rate of the refrigerant in the header, resulting in the refrigerant gas-liquid when the heat exchanger is used as an evaporator. Stratification, uneven liquid separation when entering the flat tube, reducing the performance of the heat exchanger and increasing the refrigerant charge at the same time

[0003] The patent CN103245132B discloses a microchannel heat exchanger that is beneficial to reduce the amount of refrigerant charge, and provides a way to rotate the end of the flat tube by 90° and then insert it into the header, thereby reducing the diameter of the header and reducing the amount of charge. A technical solution with a small amount of refrigerant filling, but in this technical solution, after the end of the flat tube is rotated by 90°, the distance between two adjacent flat tubes will expand to exceed the width of the flat tube, which is not conducive to heat exchange outside the tube

[0004] The patent CN201964816U discloses a microchannel heat exchange flat tube with heterosexual nozzles and a heat exchanger, which provides a port that transforms the flat tube port from a flat port with multiple microchannels into a circular, polygonal, etc. cross-sectional port. , so as to reduce the diameter of the header and reduce the technical solution of refrigerant injection, but the flat tube structure of this technical solution is complicated and difficult to process

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