Dynamic Seal Rocking Mechanism for Spacecraft Orbit Control Engine

Abstract

The invention provides a movable seal swinging mechanism for a space aircraft orbit-control engine. The motive seal swinging mechanism comprises a swing frame, bearing seats, swing shafts, shaft sleeves, a bearing, metal hard pipes and seal rings. The swing frame is divided into two half bodies and forms a whole when the swing mechanism is in final assembly. As a bearing frame when the engine swings, the inner rings of the shaft sleeves are mounted on the swing shafts and the outer rings are matched with the bearing seats or the swing frame. The swing shafts are designed as a hollow form and are sealed with the shaft sleeves through the two seal rings to form a motive seal inner chamber. A fuel line and an oxidizing agent line are each provided with two motive seal swinging structures. The metal hard pipes are adopted to connect the motive seal structures in the same line. The whole mechanism compensates the angular variation in the process of the two-way swinging of the engine through the movable sealing of the swing shafts and the bearing sleeves and conveys propellants into a thrust chamber through a flowing channel formed by the motive seal inner chamber and a duct. The motive seal swinging mechanism for the space aircraft orbit-control engine has the advantages that structure is compact and appearance is simple, meanwhile, the ability that the engine resists the mechanics environment is improved and the reliability of the swing engine is promoted.

Description

technical field [0001] The invention relates to the technical field of spacecraft attitude and orbit control power systems, in particular to an engine swing technology. Background technique [0002] With the continuous advancement of science and technology in the aerospace field, it is necessary to develop an advanced upper stage capable of multi-satellite launch and orbital deployment to meet the growing demand for small satellite launches. In view of the technical characteristics brought about by multi-satellite launches such as long on-orbit running time, on-orbit separation of asymmetric bodies, and large eccentricity adaptive attitude control, the orbit control engine is required to provide large-angle vector thrust, long life, and high reliability. In order to meet the performance requirements of the engine and realize the reliable swing of the engine, it is necessary to develop a reliable large-angle swing mechanism as the dynamic angle compensation of the propellant ...

AI Technical Summary

Problems solved by technology

The dynamic seal swing mechanism has multiple functions such as two-way swing with a large angle of not less than ±30°, stable delivery of working medium, and long-term on-orbit flight

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