Four-way valve and air conditioning system

Abstract

The invention provides a four-way valve and an air conditioning system. The four-way valve is used for the air conditioning system and comprises a main valve body (1) and a first pilot valve (2), wherein the main valve body (1) comprises an interface C, an interface D, an interface E and an interface S; the first pilot valve (2) comprises an interface C', an interface D', an interface E' and an interface S'; the interface C' of the first pilot valve (2) is connected to a first valve core driving end of the main valve body (1) through a first signal pipe (3); the interface E' of the first pilotvalve (2) is connected to a second valve core driving end of the main valve body (1) through a second signal pipe (4); the interface D' of the first pilot valve (2) is connected with a third signal pipe (5); the other end of the third signal pipe (5) is used for being connected to a pipeline between an oil separator (16) of the air conditioning system and an exhaust opening of a compressor (14).According to the four-way valve disclosed by the invention, the problem of longer switching time of the four-way valve caused by balanced pressure of two ends of a piston in the switching process of the four-way valve can be effectively avoided and the switching efficiency of the four-way valve is ensured.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to a four-way valve and an air conditioning system. Background technique [0002] The four-way valve is set in the heat pump air-conditioning system to change the flow direction of the refrigerant to achieve the purpose of switching between cooling and heating, and in the heating mode, switch through the four-way valve for defrosting. [0003] The four-way valve generally adjusts the position of the spool through the pilot valve, the pilot valve has four ports, D', E', C', and S', and the four-way valve has four ports, D, E, C, S , where interface C' is connected to the first spool driving end of the four-way valve through the first signal tube, interface E' is connected to the second spool driving end of the four-way valve through the second signal tube, and interface D' is connected to the third spool driving end through the third The signal pipe is connected to t...

AI Technical Summary

Problems solved by technology

[0004] When the four-way valve is switched, when the piston moves to the middle section of the barrel, the four ports D, C, E, and S will channel through, and the pressure of the D port will drop rapidly, so that the pressure of the D port and the S port will be balanced. The interface is connected and connected to the driving end of the first spool through the first signal tube, and the third signal tube is connected to the D port and connected to the B cavity through the second signal tube, which will cause the pressure balance at both ends of the piston and make the switching time of the four-way valve The length becomes longer, causing the unit to alarm and shut down due to low pressure difference

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