Monopropellant thruster electromagnetic valve

Abstract

The invention discloses a monopropellant thruster electromagnetic valve, which comprises a filter component (1), an inlet joint (2), a locking nut (3), a guide spring (4), a lead wire (5), an upper valve body (6), a magnetic isolation ring (7), an armature lever (8), an armature (9), an external magnetizer (10), a flange plate (11), a sealing spring (12), a baffle plate (13), a valve seat (14), a coil (15) and a lower valve body (16), wherein the guide spring (4) is a single-arm circular flat spring; and the sealing spring (12) is a double-arm S-shaped circular flat spring. Two flat springs with large radial stiffness and different axial stiffnesses are adopted for joint supporting, and the armature component is suspended in a valve body of the electromagnetic valve and not in contact with the inner wall of the electromagnetic valve, thereby avoiding the possibility of self-pollution of the electromagnetic valve caused by redundancy materials generated by friction between the armature component and a framework of the valve body during the opening and the closing of the electromagnetic valve, and improving reliability in the opening and the closing of the electromagnetic valve and sealing reliability.

Description

technical field [0001] The invention relates to the technical field of satellite propulsion, in particular to an electromagnetic valve controlled by an electric signal and driven by a solenoid electromagnet. Background technique [0002] Solenoid valves are used in satellite propulsion subsystems for thruster propellant control. The traditional solenoid valve uses the springback force of a coil spring or a single leaf spring to seal the valve port. Due to the radial asymmetry of the springback force, it is easy to cause the entire armature or one end of the armature to contact the inner wall of the valve. When the valve is switched on and off under load, the armature is subjected to the joint action of magnetic field force and hydraulic pressure, which makes the armature assembly rub against the inner wall of the valve. During the life of the satellite, the switching times of the solenoid valve are generally between 100,000 and 1 million times. The friction caused by freque...

AI Technical Summary

Problems solved by technology

During the life of the satellite, the switching times of the solenoid valve are generally between 100,000 and 1 million times. The friction caused by frequent switching will produce a lot of excess. If the excess accumulates at the valve port, it will easily lead to poor sealing reliability and internal leakage rate of the solenoid valve. Reduced, in severe cases, it will cause propellant leakage and cause satellite failure

If the excess material accumulates in the injector downstream of the thruster, it will easily cause blockage, resulting in a decrease in the specific impulse of the thruster and a decrease in performance

[0003] In addition, the friction force will change the opening and closing time and opening and closing current of the solenoid valve, making the switching performance of the same batch of solenoid valves unstable and poor in consistency. And the accuracy of attitude control is reduced, and the difficulty of control is increased

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