One-way valve for satellite attitude and orbit control propellant supply system

Abstract

The invention discloses a one-way valve for a satellite attitude and orbit control propellant supply system. The one-way valve comprises an upper shell. The upper shell is connected with a lower shell. A main valve core is arranged between the upper shell and the lower shell. A first spring is arranged between the outer side wall of the main valve core and the inner side wall of the lower shell. Aconstant pressure difference valve core is arranged in the main valve core. A second spring is arranged beside the constant pressure difference valve core. A plug is arranged beside the second spring. The plug is connected with the main valve core. When the one-way valve is in a small flow state, a main valve is in a full-open state, and thus an oscillation region which is easy to generate due tothe fact that the opening degree of a traditional one-way valve is too sensitive to pressure difference is avoided; and when the flow rate increases, a constant pressure difference variable orifice design structure is adopted, and the pressure difference between the feeding end and the discharging end of the main valve core of the one-way valve is prevented from excessively increasing.

Description

technical field [0001] The invention relates to the field of satellite attitude and orbit control, in particular to a one-way valve used in a satellite attitude and orbit control propellant supply system. Background technique [0002] There are currently three types of satellite attitude and orbit control power systems, namely solid motors, electric propulsion motors and liquid propellant power systems. In the liquid engine propellant supply system, the high-pressure air is generally used to push the tank with a diaphragm, so that the propellant on the other side of the tank diaphragm reaches the desired pressure and is supplied to the engine. In order to improve the safety of the satellite attitude and orbit propellant supply system, most space satellites are now equipped with a one-way valve at the inlet of the tank that only provides one-way flow of gas, so as to avoid the propellant entering the gas in case the tank diaphragm ruptures. The supercharging side causes an a...

AI Technical Summary

Problems solved by technology

In order to improve the safety of the satellite attitude and orbit propellant supply system, most space satellites are now equipped with a one-way valve at the inlet of the tank that only provides one-way flow of gas, so as to avoid the propellant entering the gas in case the tank diaphragm ruptures. The supercharging side causes an accident in the system. At present, the one-way valves used in the satellite attitude and orbit control power system are all spring baffle type one-way valves. Due to the characteristics of the structure, it is very easy to have its own oscillation phenomenon when the flow rate is small. If this The oscillation frequency is the same as the natural frequency of the diaphragm of the tank, which may cause tank resonance and damage the diaphragm and cause an accident

In order to avoid this kind of oscillation, some check valves are equipped with an isolation piston, and a throttle plate is installed in the middle of the piston. Due to the large piston surface, the single check valve can be closed when a small pressure difference is generated at both ends of the piston. The directional valve overcomes the spring force and pushes to the maximum open position, so as to avoid the oscillation phenomenon at low flow rate, but because the throttle hole on the throttle plate is a fixed cross-section, when the number of engines working in the attitude-orbit control power system increases, due to the constant flow cross-section , leading to an increase in the pressure loss at both ends of the one-way valve, thereby affecting the thrust of the engine, so the current one-way valve is only suitable for attitude control power systems with a narrow propellant flow range

[0003] With the increasing development of aerospace technology, the rapid orbit change of satellites and the precise control of attitude are required. The number of engines driven by the same attitude and orbit control power system is increasing, and its flow range is increasing. The current one-way Valves cannot meet this need

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