Anti-backfire device for mechanical pasty propellant rocket engine

The invention discloses an anti-backfire device for a mechanical pasty propellant rocket engine. The anti-backfire device comprises a storage tank connecting part, a piston shell, a piston, springs, a pasty propellant fuel gas generator and a hole plate seat. The storage tank connecting part is provided with a pasty propellant outlet passageway. The piston shell is fixedly connected with the agent outlet end of the storage tank connecting part. The outer wall face and the inner wall face of the piston are each formed by cylindrical faces of different diameters, and the large-diameter cylindrical face of the outer wall face is in sliding seal fit with the inner wall of the piston shell. The small-diameter cylindrical face of the outer wall face of the piston is sleeved with the springs. One end of the pasty propellant fuel gas generator is fixedly connected with the piston shell, the other end of the pasty propellant fuel gas generator stretches into the piston and is in sliding seal fit with the large-diameter cylindrical face of the inner wall face of the piston, and the pasty propellant fuel gas generator is limited by a stepped face between the small-diameter cylindrical face and the large-diameter cylindrical face of the inner wall face of the piston. The hole plate seat is fixed to the agent inlet port end of the pasty propellant fuel gas generator. The anti-backfire device is simple in principle, reliable in work, low in price, good in anti-backfire effect, reasonable in structural layout and easy to microminiaturize.