Built-in pilot operated solenoid valve

Abstract

The invention discloses a built-in pilot operated solenoid valve with a self-locking function. The built-in pilot operated solenoid valve mainly consists of a primary valve body, a filter neck, a filter, a valve bush, a cylindrical spring, a spring force regulating pad, a current-limiting pin, current blocking rings, a primary valve element, a secondary valve coil assembly, a magnetism isolating pad, a secondary valve element and a secondary valve seat, wherein a secondary valve adopts a coil and permanent magnet combined drive source, has a bistable-state passive self-holding function, and power can be provided for state shifting by two coils. By virtue of matching between mounting force of the current-limiting pin and mounting force of the cylindrical spring, reliable action of a primary valve is realized. Under a small-flow working condition, a medium can flow to the downstream through a channel between the current-limiting pin and the secondary valve. A reverse sealing structure made of a metal-hard plastic can give consideration to gastight requirements of high-pressure and low-pressure working conditions. The product can be used gas and liquid-path switch valves with large-flow multi-action needs, and is especially suitable for a high-pressure medium. By virtue of interface adaptive improvement, the built-in pilot operated solenoid valve further can be used as a control valve of an attitude and orbit control liquid rocket engine.

Description

technical field [0001] The invention relates to a pilot solenoid valve, which can be used as an isolation valve of a liquid rocket engine supply system or a high-pressure gas cylinder of a cold air engine system, a switch valve of a pneumatic or hydraulic system pipeline, and can also be used as a position, Orbital control power system liquid rocket motor control valve. Background technique [0002] In the liquid rocket engine supply system or air-conditioning engine system, due to the high inflation pressure of the gas cylinder and high requirements for the sealing performance and working reliability of the gas cylinder isolation valve, the gas cylinder isolation valve usually adopts an electric explosion valve with good sealing performance and reliable operation. valve. However, the electric explosion valve is a one-time work product, which cannot meet the requirements of multiple starts and repeated use, and brings a lot of inconvenience to the final assembly test. In a...

AI Technical Summary

Problems solved by technology

However, the electric explosion valve is a one-time work product, which cannot meet the requirements of multiple starts and repeated use, and brings a lot of inconvenience to the final assembly test

In addition, the electric explosion valve is driven by gunpowder, which will produce a large impact when it works, which will have an adverse effect on the assembly structure

[0003] There are also systems that try to use solenoid valves instead of electric explosion valves as high-pressure gas circuit switching valves. Due to their small diameter, heavy weight, and high energy consumption, their applications are greatly limited.

Or use a pilot solenoid valve or a self-locking valve, which requires an independent control medium, which makes the system complex, and there are also exhaust holes in the structure, and the impulse generated by the exhaust action will adversely affect the aircraft's operating attitude

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