Stepwise direct-action piston type high-pressure-difference electromagnetic valve

Abstract

The invention discloses a stepwise direct-action piston type high-pressure-difference electromagnetic valve. The electromagnetic valve comprises a valve body, wherein an air inlet, an air outlet and an air channel communicated with the air inlet and the air outlet are formed in the valve body; a valve holder is assembled on the valve body; a sleeve tube is assembled at the upper end of the valve holder; a coil is arranged at the outer part of the sleeve tube; a static iron core is arranged at the upper end of the sleeve tube; a first movable iron core and a second movable iron core are arranged in the sleeve tube; a movable iron core spring is arranged between the first movable iron core and the second movable iron core; a pushing rod is arranged on the second movable iron core in a penetrating manner; a valve mouth, a valve core assembly and a valve core spring arranged between the valve mouth and the valve core assembly are arranged in the valve holder; a first valve opening is formed in the upper end of the valve mouth; the first valve opening is matched with the lower end of the second movable iron core; a second valve opening is formed in the lower end of the valve core assembly; the second valve opening is matched with the air channel; a pilot hole and a pressure releasing hole are formed in the valve core assembly. The electromagnetic valve has the advantages of being reasonable in structure, and accurate and sensitive to control, and can be suitable for high-pressure-difference environment.

Description

technical field [0001] The invention relates to the technical field of electromagnetic valve manufacturing, in particular to a step-by-step direct-acting piston type high-pressure differential electromagnetic valve. Background technique [0002] A general solenoid valve consists of an excitation coil, a fixed iron core, a compression spring, a movable iron core, and a valve body. Its working principle is that when the excitation coil is not energized, the sealing head of the movable iron core will close the valve under the action of the compression spring and the back pressure of the valve inlet medium. When the excitation coil is energized, the electromagnetic force overcomes the reaction force of the compression spring and the back pressure of the inlet medium of the valve, so that the movable iron core moves to the fixed iron core until the two planes are attracted, and the valve is in the open state. [0003] However, when the solenoid valve is used in a high pressure d...

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Problems solved by technology

[0003] However, when the solenoid valve is used in a high pressure difference environment, the high pressure difference will cause the valve core to be under pressure and cannot overcome the magnetic force and cannot be opened. Therefore, ordinary solenoid valves cannot be used normally in a high pressure difference environment, and the structure needs to be modified Improvement can meet the needs of use under high pressure

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