Thin-wall double-eccentric-part spherical shell structure provided with rigid shaft

Abstract

A thin-wall double-eccentric-part spherical shell structure provided with a rigid shaft comprises a thin-wall spherical shell (1) and the rigid shaft (2); the thin-wall spherical shell (1) is a spherical-crown-shaped part for realizing a sealing function in a ball valve closed state; the upper end surface and the lower end surface of the spherical-crown-shaped part are sector-shaped surfaces; therigid shaft penetrates through the upper sector-shaped surface and the lower sector-shaped surface and is fixedly connected with the upper sector-shaped surface and the lower sector-shaped surface; eccentric distances exist between the rotating center of the rigid shaft and the geometric center of the spherical-crown-shaped part in the relative radial direction and in the relative axial direction;and the whole spherical shell structure is driven by an external driving mechanism to rotate.

Description

technical field [0001] The invention relates to a thin-walled double eccentric partial spherical shell structure with a rigid shaft suitable for a ball valve of a liquid rocket engine. . Background technique [0002] Ball valves are widely used as propellant supply switches in liquid rocket engines. Ball valves have the characteristics of small flow resistance and are not limited by working pressure and flow size. [0003] In order to avoid the wear of the valve seat and the ball during the action of the ball valve, the traditional engine ball valve design method is to first introduce the control air to separate the ball from the valve seat and then rotate the ball to avoid wear. The single switch action of the ball valve is decomposed into lift-open (Closing)-seat combined action, the ball valve itself must be equipped with a lifting mechanism, and the engine must also be equipped with related lifting air control and electronic control systems, which will complicate the st...

AI Technical Summary

Problems solved by technology

[0003] In order to avoid the wear of the valve seat and the ball during the action of the ball valve, the traditional engine ball valve design method is to first introduce the control air to separate the ball from the valve seat and then rotate the ball to avoid wear. The single switch action of the ball valve is decomposed into lift-open (Closing) - combined action of seating, the ball valve itself must be equipped with a lifting mechanism, and the engine must also be equipped with related lifting air control and electronic control systems, which will complicate the structure of the engine system and the ball valve itself, increase the weight of the engine, and reduce the reliability of the engine

However, the integral ball structure of traditional ball valves highlights the disadvantage of heavy weight on large-diameter valves.

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