Indirect measurement method of valve core and valve cover coincidence quantity of pneumatic servo valve and uses thereof

Abstract

The invention discloses an indirect measuring method of overlap ratio between a valve plug and a valve sleeve of a pneumatic servo valve, which obtains the geometric overlap ratio between the valve plug and the valve sleeve on the inner matched structure of the pneumatic servo valve that is equivalent to two load resultants respectively of an upper course and a lower course by measuring the static pressure property of the pneumatic servo valve. During the change process of valve displacement, if the pressure at a load opening is absolutely equal to the gas supply pressure, the load opening isdetermined to be absolutely communicated with a constant-pressure gas supply, thus obtaining the load resultants of the upper course that is connected with the pneumatic servo valve at the moment; ifthe pressure at another load opening is absolutely equal to the atmospheric pressure, the load opening is determined to be absolutely communicated with a vent, thus obtaining the load resultants of the lower course that is connected with the pneumatic servo valve at the moment; if the valve displacement changes are positive and negative, four load resultants of the upper course and the lower course are respectively determined. The indirect measuring method of the overlap ratio between the valve plug and the valve sleeve of the pneumatic servo valve greatly improves measuring efficiency and economical efficiency in the production process of the pneumatic servo valve.

Description

Indirect Measurement Method and Application of Pneumatic Servo Valve Spool and Sleeve Overlapping Amount technical field The invention belongs to the technical field of mechanical parts, transmission devices and fluid control in mechanical engineering, and in particular relates to an indirect measurement method for the coincidence amount of a valve core and sleeve of a pneumatic servo valve. Background technique Pneumatic servo control originated from the gas servo system for missile and rocket flying body attitude control before and after World War II. The research on the pneumatic servo mechanism began in 1956. J.L.Shearer of the United States first studied the characteristics of the pneumatic servo motor combined with the pneumatic valve and the cavity. Japan's Araki Kenji (1971, 1979) researched and developed a two-stage pneumatic servo valve with force feedback, proposed a spring and cavity compensation scheme and increased the bandwidth from 70Hz to 190Hz, and also c...

AI Technical Summary

Problems solved by technology

The main purpose of the present invention is to provide an indirect measurement method for the coincidence amount of the valve core and sleeve of the pneumatic servo valve. By measuring the static pressure characteristics of the pneumatic servo valve, the geometric overlap of the valve core and sleeve of the pneumatic servo valve can be indirectly measured to solve the problem of direct measurement. The problems of high cost and uncertain performance, to achieve effective measurement in the process of commercialization and practical application of high-performance pneumatic servo valves

Images