Gas damping and buffering free piston

Abstract

The invention relates to the technical field of impact and buffering, in particular to a gas damping and buffering free piston. The gas damping and buffering free piston comprises a buffering cavity,an end cover, a buffering piston and a collision body, wherein a buffering gas cavity is formed in the buffering cavity; a buffering gas with a certain pressure can be inflated into the buffering gascavity; one end of the buffering piston penetrates through the end cover to be inserted into the buffering gas cavity; and the other end of the buffering piston is connected with the collision body. According to the gas damping and buffering free piston, as the collision is finished in twice and kinetic energy is consumed in twice, the energy, needing to be absorbed in one time, of the collision body is reduced, the collision time is greatly prolonged to be beneficial for reducing impact load generated by collision, and therefore, the impact load peak value is reduced; in addition, the buffering piston and the collision body stop moving first during collision; and as the buffering gas is available in the buffering gas cavity, the buffering cavity decelerating and stopping time can be greatly prolonged, and direct collision between the buffering cavity and the buffering piston is avoided; and moreover, the pressure in the buffering cavity is gradually increased, the gas damping and buffering free piston is more beneficial for the collision body to recover from the first collision.

Description

technical field [0001] The invention relates to the technical field of wind tunnels, in particular to a free piston with gas damping and buffering. Background technique [0002] During the operation of piston-driven shock tunnels, cannon wind tunnels and other impulsive wind tunnels with piston drives, the free piston generally undergoes acceleration, sharp deceleration, stop, and re-acceleration after being launched by the piston drive, and finally hits the ground at a certain speed. Piston drive bottom stop. Therefore, the operation of the piston driver often pursues the so-called "tuning" operation to reduce the speed of the free piston collision and reduce the risk of damage to the structure of the piston driver due to high-speed collision; at the same time, a free piston buffer device must be designed to buffer the impact of the collision. [0003] At present, there are two commonly used cushioning methods: one is to directly install impact-resistant cushioning materia...

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Problems solved by technology

[0003] At present, there are two commonly used cushioning methods: one is to directly install impact-resistant cushioning material on the head of the free piston, and the cushioning material absorbs the energy of the collision, but this method is generally only suitable for working conditions with relatively small collision speeds; The second is to install elastic elements, damping energy-absorbing materials and other devices at the bottom of the piston driver, and these devices can absorb the collision, but this method will weaken the driving ability of the piston driver

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