Ball valve device for liquid rocket engine

Abstract

The invention provides a ball valve device for a liquid rocket engine. A shell, a ball body, a driving device, a valve seat, a diaphragm capsule assembly and a fixed cover are included, a channel for a liquid medium to circulate is arranged in the shell, and the ball body is driven by the driving device to rotate, so that a channel body on the ball body communicates with or is closed from the channel, and accordingly, circulation or cut-off of the liquid medium is achieved. The valve seat, the diaphragm capsule assembly and the fixed cover are located at the medium inlet end of the shell, and the valve seat is embedded in the inner side of the diaphragm capsule assembly and used for achieving sealing of the medium channel through contact with the ball body. The outer side of the diaphragm capsule assembly is fixedly connected with the shell, the diaphragm capsule assembly is provided with a pneumatic control cavity and a diaphragm structure, and the diaphragm structure communicates with the pneumatic control cavity. An elastic piece is arranged between the fixed cover and the diaphragm capsule assembly, and before the liquid medium circulates, ventilation is conducted on the pneumatic control cavity, so that the diaphragm structure expands to overcome the elastic force of the elastic piece, and the valve seat is driven to be separated from the ball body. Friction between a valve seat sealing surface in the ball valve and the surface of the ball body can be avoided, and safety and reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of power system valves, in particular to a ball valve device for a liquid rocket engine. Background technique [0002] With the rapid development of the aerospace industry, various technologies involved in the rocket field have also achieved rapid progress. Valves are an important part of starting and shutting down liquid rocket engines. The medium of the cryogenic liquid rocket engine is an ultra-low temperature propellant, the temperature range of the medium is usually around 20K-120K, and the pressure is above 10MPa. The valve operating gas is usually high-pressure gas with a pressure of about 20MPa. [0003] Ball valves are an important component of liquid rocket motor propellant supply systems. Ball valves are able to open and close on command. At the initial moment when the ball valve is opened and the fuel is cut off, because the ball inside is in direct contact with the valve seat, the ball will ...

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