Self-operated four-way valve and its air conditioning system

Abstract

The invention discloses a self-propelled four-way valve and an air-conditioning system thereof. The four-way valve comprises a valve body, a first piston assembly and a second piston assembly are arranged at the two ends of an inner cavity of the valve body respectively, a first pressure cavity is formed between the first piston assembly and a corresponding valve body end cover, a second pressure cavity is formed between the second piston assembly and a corresponding valve body end cover, and a middle pressure cavity is formed between the first piston assembly and the second piston assembly; a sliding block is arranged inside the middle pressure cavity and is connected to the first piston assembly and the second piston assembly, and the middle pressure cavity is connected to a first connection tube, a second connection tube, a third connection tube and a fourth connection tube; the first pressure cavity is connected to a first capillary tube, the second connection tube is connected to one end of a second capillary tube, and the other end of the second capillary tube is connected to the second pressure cavity. According to the four-way valve and the air-conditioning system thereof, the flow direction of refrigerating fluid is automatically switched through the difference between the high pressure and the low pressure inside the air-conditioning system and a reset spring, and therefore the operation state of the air-conditioning system can be switched, and additional power sources are not needed.

Description

technical field [0001] The present invention relates to air conditioning systems. Background technique [0002] At present, energy-saving air-conditioning products need to perform local functional heat exchange (such as heat recovery, electronic control module cooling, economizer, etc.) to switch. Now to solve this problem, one is to connect a one-way valve to the auxiliary cooler, and connect a capillary tube to the outlet of the outdoor heat exchanger in parallel with the reverse inlet of the one-way valve to the outlet of the outdoor heat exchanger, so that the refrigerant enters during heating If the one-way valve is blocked, it will enter the outlet of the outdoor heat exchanger through this capillary, but this method will cause flow resistance, resulting in excessive pressure drop in the system, and there is a risk of dirt blockage and ice blockage; the second is to connect two solenoid valves in parallel. The cost is too high, and the electric control scheme needs t...

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Problems solved by technology

Now to solve this problem, one is to connect a one-way valve to the auxiliary cooler, and connect a capillary tube to the outlet of the outdoor heat exchanger in parallel with the reverse inlet of the one-way valve to the outlet of the outdoor heat exchanger, so that the refrigerant enters during heating If the one-way valve is blocked, it will enter the outlet of the outdoor heat exchanger through this capillary, but this method will cause flow resistance, resulting in excessive pressure drop in the system, and there is a risk of dirt blockage and ice blockage; the second is to connect two solenoid valves in parallel. The cost is too high and the electronic control scheme needs to be changed

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