A microchannel heat exchanger

Abstract

The invention discloses a microchannel heat exchanger and belongs to the technical field of air conditioner heat exchange. The heat exchanger comprises a left upper end cover, a process adjusting device, a refrigerant inlet pipe, a left liquid collecting pipe, a refrigerant outlet pipe, a left lower end cover, fins, porous flat pipes, a right lower end cover, a right liquid collecting pipe, a right upper end cover and a sleeve; the porous flat pipes are connected with holes in the left liquid collecting pipe and the right liquid collecting pipe, the fins are arranged among the porous flat pipes, the refrigerant inlet pipe and the refrigerant outlet pipe are arranged on the left liquid collecting pipe, the sleeve and the process adjusting device are arranged in the left liquid collecting pipe, and the left liquid collecting pipe, the sleeve and the process adjusting device are coaxial. The microchannel heat exchanger provided by the invention can change the quantity of the porous flat pipes in each process, so as to achieve the purpose of changing the refrigerant flow area in each process, and enabling the heat exchange performance and the pressure loss of the microchannel heat exchanger to reach an optimal state. According to the invention, the operating performance and the safety of a refrigerating system can be improved.

Description

Technical field: [0001] The invention belongs to the technical field of air-conditioning heat exchange, and in particular relates to a microchannel heat exchanger. Background technique: [0002] Microchannel heat exchangers are key components in air conditioning systems such as figure 1 As shown, it consists of a left liquid collecting pipe 4, a porous flat tube 8 communicating with the liquid collecting pipe, fins 7 arranged between adjacent porous flat pipes, and a right liquid collecting pipe 10. Its working principle is that the refrigerant enters the left liquid collecting pipe 4 from the refrigerant inlet pipe 3 of the left liquid collecting pipe 4, and then enters the porous flat tube 8, and flows through the porous channel of the porous flat tube 8. The outer surface of the porous flat tube 8 and the fins 7 placed on it exchange heat with the outside air, thereby realizing cooling or heating. After the refrigerant exchanges heat in the micro-channel heat exchanger,...

AI Technical Summary

Problems solved by technology

Therefore, for microchannel heat exchangers with one or two processes and above, due to changes in the type of refrigerant or changes in the operating conditions of the refrigeration system or the external environment, changes in the state of the refrigerant at the inlet of the header will cause Its heat transfer performance attenuation or excessive flow pressure drop causes system performance attenuation

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