Microchannel heat exchanger and its air conditioner

Abstract

The invention discloses a micro-channel heat exchanger and an air conditioner thereof, wherein the micro-channel heat exchanger includes a first liquid collection pipe and a second liquid collection pipe arranged side by side, and from the first liquid collection pipe to the A plurality of flat tubes extending from the second liquid collecting pipe, each flat tube is provided with at least one water spray channel and a plurality of refrigerant channels inside, each flat tube is provided with the water spray channel and is arranged towards the adjacent flat tube The water spray holes, the plurality of refrigerant channels communicate with the first liquid collection pipe and the second liquid collection pipe, and the first liquid collection pipe or the second liquid collection pipe is provided with a refrigerant inlet and a refrigerant outlet, so The second liquid collecting pipe is provided with a water cavity communicating with the water spray channels of the plurality of flat tubes, and a refrigerant chamber spaced apart from the water cavity, and the second liquid collecting pipe is provided with a water chamber communicating with the water Cavity water inlet. The technical scheme of the invention realizes the combined heat dissipation of air cooling and water cooling, and improves the heat exchange efficiency of the heat exchanger.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a microchannel heat exchanger and an air conditioner thereof. Background technique [0002] The microchannel heat exchanger is mainly composed of two cylindrical liquid collectors, flat tubes, fins, reinforcing plates and fixing blocks. The flat tube is installed between the left and right liquid collection pipes, and the left and right liquid collection pipes communicate with the microchannels through the microchannels inside the flat pipes to form a closed space. The fins are fixed between the flat pipes and the flat pipes. It becomes N cooling units with the microchannel, which is responsible for transferring the heat of the fluid inside the microchannel to the air. [0003] The microchannel heat exchanger installed in the existing air conditioner has a single heat dissipation method. If the temperature is high in summer, the air conditioner will frequently trip prot...

AI Technical Summary

Problems solved by technology

[0003] The micro-channel heat exchanger installed in the existing air conditioner has a single heat dissipation method. If the temperature is high in summer, the air conditioner will frequently trip protection in a high temperature environment, which is likely to cause customer complaints

In addition, due to the close pitch of the fins, the air passage resistance is large, so the wind speed on the windward side of the heat exchanger is greater than that on the leeward side.

However, the unit heat transfer coefficient of the windward side and the leeward side of the heat exchanger is the same as the heat transfer area, and the wind speed on the leeward side is low, and the unit heat dissipated in this area is smaller than that of the windward side, which makes the temperature of the leeward side of the existing microchannel heat exchanger High, while the windward side has good heat dissipation and low temperature, which affects the heat dissipation efficiency of the heat exchanger

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