Automatic anti-backfire device for pasty propellant rocket motor

Abstract

The invention discloses an automatic anti-backfire device for a pasty propellant rocket motor. The automatic anti-backfire device is composed of a shell, a hole plate base, a hole plate, a heat insulation hole plate, a piston sleeve, an elastic element and an anti-backfire piston. The inner wall of the shell contracts and then expands, when the anti-backfire piston is not stressed, the taper angle of the taper surface of the expansion part is equal to that of the taper surface of the anti-backfire piston, and the elastic force of the elastic element enables the two taper surfaces to make contact with each other. When an engine needs to work, a pasty propellant in a propellant storage box is extruded, and the anti-backfire piston is pushed by the pasty propellant to be separated from the contact surface between the anti-backfire piston and the shell; when the engine stops working, pressure in the propellant storage box is reduced, and a channel between the anti-backfire piston and the shell is closed under the elastic force of the elastic element. In this way, automatic anti-backfire performance of the pasty propellant rocket motor is achieved, and safety and reliability of the engine are guaranteed.

Description

technical field [0001] The invention belongs to the field of rocket engines, in particular to an automatic backfire prevention device applied to paste propellant rocket engines. Background technique [0002] Paste propellant is a new type of non-solid and non-liquid propellant, which is a special type of propellant in the field of chemical rocket propulsion. It uses a small amount of gel (or thickener, stabilizer) to combine a large amount of oxidizer, The fuel or their mixture is uniformly stirred and mixed to form a "toothpaste"-like suspension propellant with a certain structure and specific properties and a certain storage period. It is a non-Newtonian fluid and has the best comprehensive characteristics of liquid and solid propellants. It is like a solid propellant when it is stored, and it becomes fluid like a liquid propellant after pressurization, but it does not leak, does not explode, and is safer and more reliable. Paste rocket motors can be switched on and off a...

AI Technical Summary

Problems solved by technology

The advantage is that anti-backfire can be realized without designing any special device; the disadvantage is also obvious, because the anti-backfire radius is generally very small, usually only a few millimeters, and the transportation will consume a lot of energy, and it cannot be realized Wide Range of Flow Regulation

The other is the anti-backfire device using a cone valve proposed by Li Yuesen in "Preliminary Research on the Application Characteristics of Pulsed Paste Propellants". When the engine stops working, close the cone valve to prevent the flame from continuing to spread; Its disadvantage is that it cannot realize automatic control

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