Microchannel heat exchanger and air conditioner thereof

Abstract

The invention discloses a microchannel heat exchanger and an air conditioner thereof. The microchannel heat exchanger comprises a first liquid collecting pipe, a second liquid collecting pipe and a plurality of flat pipes extending towards the second liquid collecting pipe from the first liquid collecting pipe, and the first liquid collecting pipe and the second liquid collecting pipe are arranged side by side. Each flat pipe is internally provided with at least one water spraying channel and a plurality of refrigerant channels. The flat pipes are provided with water spraying holes communicated with the water spraying channels and formed by facing the adjacent flat pipes. The refrigerant channels are communicated with the first liquid collecting pipe and the second liquid collecting pipe. The first liquid collecting pipe or the second liquid collecting pipe is provided with a refrigerant inlet and a refrigerant outlet. The second liquid collecting pipe is internally provided with a water cavity communicated with the water spraying channels of the flat pipes and a refrigerant cavity, wherein the refrigerant cavity and the water cavity are arranged in a spaced manner. The second liquid collecting pipe is provided with a water inlet communicated with the water cavity. According to the technical scheme, combined heat dissipation with air cooling and water cooling combined is achieved, and the heat exchange efficiency of the heat exchanger is improved.

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

Images