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 in the air conditioning system, including the main valve body (1) and the first pilot valve (2), the main valve body (1) includes the interface C, the interface D, the interface E and the interface S, the first pilot valve (2) ) includes port C', port D', port E' and port S', the port C' of the first pilot valve (2) is connected to the first spool of the main valve body (1) through the first signal tube (3) At the driving end, the interface E' of the first pilot valve (2) is connected to the second spool driving end of the main valve body (1) through the second signal pipe (4), and the interface D' of the first pilot valve (2) is connected to There is a third signal pipe (5), and the other end of the third signal pipe (5) is used to be connected to the pipeline between the oil separator (16) of the air conditioning system and the exhaust port of the compressor (14). According to the four-way valve of the present invention, the problem of long switching time of the four-way valve caused by the pressure balance at both ends of the piston during the switching process of the four-way valve can be effectively avoided, and the switching efficiency of the four-way valve can be 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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