Spherical dynamic seal structure of wobble nozzle of small solid rocket engine

Abstract

The invention provides a spherical dynamic seal structure of a wobble nozzle of a small solid rocket engine. The spherical dynamic seal structure of the wobble nozzle of the small solid rocket engine comprises a movable positive sphere, an upstream sealing spherical surface, a downstream sealing spherical surface, an upstream negative sphere arranged outside the upstream sealing spherical surface and a downstream negative sphere arranged on the downstream sealing spherical surface, wherein the upstream sealing spherical surface and the downstream sealing spherical surface cover the movable positive sphere from both sides; the upstream negative sphere and the downstream negative sphere are connected through a connecting bolt; a static sealing ring is mounted on the abutting surfaces of the upstream negative sphere and the downstream negative sphere; the portion of the abutting surfaces of the upstream negative sphere and the downstream negative sphere, which is close to the upstream sealing spherical surface and the downstream sealing spherical surface, is provided with a rectangular gap; a teflon jacket is mounted in the gap; an elastic supporting member is mounted in the teflon jacket; the teflon jacket fits with the edge of the rectangular gap under the action of the elastic supporting member. The spherical dynamic seal structure of the wobble nozzle of the small solid rocket engine has the advantages of good abrasion resistance, acid and alkali resistance, corrosion resistance and the like at high temperature, high pressure and high rotation speed.

Description

technical field [0001] The invention relates to the technical field of thrust vectoring of small solid rocket motors in aerospace, in particular to a high-pressure spherical surface dynamic sealing technology of a swing nozzle for small solid rocket motors. Background technique [0002] The thrust vectoring technology of solid rocket motors is the key to aerospace power technology, especially the development of new small solid rocket motor thrust vectoring technology has long restricted the development of low-level space aerospace vehicles. The development of small solid rocket motor thrust vectoring technology is the key to solid rocket motor An important field of technical research, the swing nozzle technology using small ball bearing or ball and socket structure is an important research direction of small solid rocket motor thrust vector technology, which has the advantages of simple structure and small servo force. A key technology that restricts the development of small...

AI Technical Summary

Problems solved by technology

This kind of rubber O-ring has been very maturely applied in the usual static seal, flat or linear dynamic seal, and it is applied to the rubber O-ring of spherical dynamic seal. Because the rubber material used in the rubber O-ring is under dynamic friction The stress state is relatively complicated; and the dynamic friction coefficient of the rubber material is relatively large, so the mutual motion load between the friction pairs is relatively large; at the same time, the rubber O-ring used in the dynamic sealing structure of the ball bearing and the ball-and-socket swing nozzle is in the dynamic The lower O-shaped sealing ring itself will have torsion, resulting in more complex sealing characteristics; and the friction surface of the dynamic sealing structure of the small solid rocket motor ball bearing and the ball-and-socket swing nozzle has a relatively large change in relative motion speed, which usually requires Quick start, quick stop, the time is usually completed within 1 second; the pressure difference between the upstream and downstream of the sealing surface is large, generally > 10MPa; the temperature range of the application condition is large, from -50°C to +200°C; There are solid particles in the medium, which cause great difficulties for the use of rubber O-rings. Many of the above factors limit the development of small ball bearings and ball-and-socket swing nozzle technology.

Images