Four-way reversing valve, air conditioning system and control method of four-way reversing valve

Abstract

The invention relates to the technical field of four-way reversing valves, in particular to a four-way reversing valve, an air conditioning system and a control method of the four-way reversing valve. The air conditioning system comprises the four-way reversing valve, a compressor, an indoor unit and an outdoor unit, wherein the four-way reversing valve comprises a main valve body with a first inner cavity and a valve element movably arranged in the first inner cavity; a first valve port, a second valve port, a third valve port and a fourth valve port which are communicated with the first inner cavity are formed in the main valve body; the first valve port is communicated with an air suction port of the compressor; the second valve port is communicated with an exhaust port of the compressor; the third valve port is communicated with the indoor unit; the fourth valve port is communicated with the outdoor unit; the valve element has a first position, a second position and a third position in the moving process; when the valve element is located at the first position or the second position, all the valve ports are communicated differently; and when the valve element is located at the third position, the first valve port and the second valve port are disconnected with the third valve port, and the first valve port and the second valve port are disconnected with the fourth valve port, so that refrigerants in the indoor unit and the outdoor unit can be prevented from flowing back to the compressor.

Description

technical field [0001] The invention relates to the technical field of four-way reversing valves, in particular to a four-way reversing valve, an air conditioning system and a control method for the four-way reversing valve. Background technique [0002] In the case of ultra-low temperature heating in the air conditioning system, the refrigerant often flows back into the compressor, which will dilute the refrigerated oil in the compressor, which will cause the compressor to fail to get effective lubrication between the moving parts when it starts. Wear and tear, and the return of the refrigerant to the compressor will increase the liquid level in the compressor, thereby increasing the oil discharge rate, resulting in an increase in the oil discharge rate when the compressor starts. [0003] In the prior art, the problem of refrigerant backflow into the compressor is mainly solved from the control logic of the air conditioning system and the design of the compressor. However,...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a four-way reversing valve, an air-conditioning system and a control method for the four-way reversing valve, which realizes cutting off the flow path between the compressor and other components of the air-conditioning system when the machine is turned off, aiming to solve the problem of Compressor wear and high oil discharge rate in the air conditioning system due to refrigerant backflow

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