Microchannel heat exchanger and air conditioner

Abstract

The invention relates to a microchannel heat exchanger. The microchannel heat exchanger is characterized by comprising heat exchange pipes, the outer walls of the heat exchange pipes are provided withflow guide grooves, and the flow guide grooves can collect and guide liquid on the outer walls of the heat exchange pipes so that the accumulated amount of the amount on the outer walls of the heat exchange pipes can be decreased. Condensate water or defrosting water accumulated on the outer walls of the heat exchange pipes can be at least partially collected into the flow guide grooves through the flow guide grooves and discharged through the flow guide grooves, thus, the amount of the water accumulated on the outer walls of the heat exchange pipes can be decreased, the frosting amount of the outer walls of the heat exchange pipes can be decreased under the low-temperature working condition, and the heat exchange efficiency of the heat exchange pipes is improved.

Description

technical field [0001] The invention relates to the technical field of heat exchange devices, in particular to a microchannel heat exchanger and an air conditioner. Background technique [0002] At present, tube-belt microchannel heat exchangers have been widely used in various fields such as automobiles, medical care, and household air conditioners. They are widely favored for their lightweight, compact structure, high heat exchange efficiency, and difficult rewinding. In the tube-belt microchannel heat exchanger, a plurality of holes are opened in the flat tube to increase the convective heat transfer area on the refrigerant side, thereby increasing the amount of heat transfer on the cooling side. In terms of heat transfer on the wind side, wavy heat transfer fins with the same width as the flat tubes are usually installed between adjacent flat tubes, and the peaks and troughs of the fins are connected to the adjacent two The flat tubes are welded together to reduce the h...

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Problems solved by technology

[0003] The structure of the tube-belt heat exchanger greatly improves the heat transfer per unit area of ​​the heat exchanger. However, when the tube-belt microchannel heat exchanger is used as an evaporator in a heat pump system under low temperature conditions, the frost layer will condense on the fins. On the sheet and the flat tube, after using reversing defrosting, due to the rectangular structure of the flat tube section, the defrosting water will accumulate on the flat tube. When switching back to the heat pump system again, the water accumulated on the flat tube will quickly freeze. Frost, repeating itself, causes the frost layer on the surface of the heat exchanger to become thicker and thicker, and the heat transfer capacity of the heat exchanger continues to decrease, eventually causing the air conditioning system to stop running

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