Straight moving type three-way electromagnetic valve

Abstract

The invention is a direct acting three-way valve, respectively arranging valve ports A and B on stoppers and valve seat at the two ends of a sleeve, arranging an iron core in a cavity between the two valve ports, where the iron core moves to and fro by the cooperation of return spring and electromagnetic coil to selectively close one valve port by seal stopper on it so as to make the other valve port turned on communicate with the outlet arranged on the valve seat, and a supporting spring is arranged in back of the seal stopper; and the invention is characterized in that: the back of at least one seal stopper is equipped with a sealed cavity and this seal stopper is made with a channel communicating with the corresponding valve port and the sealed cavity. And the invention can assure that the seal stoppers can effectively stop the valve ports and have certain buffering ability without designing springs of larger elasticity and increasing power of electromagnetic coil.

Description

technical field [0001] The invention relates to a solenoid valve for an air conditioner, in particular to a direct-acting three-way solenoid valve for controlling the flow direction of refrigerant. Background technique [0002] At present, most of the direct-acting three-way solenoid valves used in refrigeration and air-conditioning systems have the structures shown in Figures 1 and 2, and a valve seat (7) and a head (3) at both ends of the sleeve (5) are respectively provided Valve ports, two core irons (10) are built in the cavity between the two valve ports, which can move back and forth under the coordinated action of the return spring and the electromagnetic coil, and can be selectively closed by the sealing plug on it. Closed so that the other opened valve port communicates with the outlet provided on the valve seat (7), supported by a spring at the rear of said sealing plug. These solenoid valves work as follows: [0003] (1) High pressure at the A valve port: In th...

AI Technical Summary

Problems solved by technology

[0006] For the direct-acting three-way solenoid valve with the above structure, when the core iron (10) moves back and forth in the cavity between the two valve ports under the coordinated action of the return spring and the electromagnetic coil to close a certain valve port, the sealing plug will The force maintained on the valve port comes from the spring supported behind it, and the medium at the closed valve port end will act on the sealing plug to offset part of the elastic force of the supporting spring, especially when the end is high pressure, this offset is The more serious; theoretically speaking, as long as there is enough spring force, the sealing effect can be achieved, but increasing the spring force will inevitably increase the power consumption, and at the same time, it will also lose the buffering effect of the seal and reduce the life of the valve; but due to Limited by the power of the existing solenoid valve itself, the power consumption is too large and energy is wasted, so the spring force cannot be increased without limit. It is difficult to use this structure to play a role in actual use.

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