GB550239A - Improvements relating to hydraulic governors - Google Patents

Abstract

550,239. Speed governors. C. A. V., Ltd., and NICOLLS, W. E. W. June 27, 1941, No. 8113. [Class 135] A speed governing mechanism for prime movers and other machines comprises a main regulating element actuated by the fluid pressure in a circulating system Under the control of an auxiliary valve mounted in a radial bore in a rotor. The valve is urged outwards by centrifugal force against the fluid pressure in the conduit to control the inward radial flow of the fluid which fluid is discharged from the rotor through an axial passage. In the form shown in Fig. 1 fluid circulated by a pump h through a conduit # acts on a spring-loaded piston j coupled to the main regulating element. The rotor d driven at a variable speed correlated to' that of the machine under control has a radial bore m housing the piston valve o connected by circumferential grooves r and s and a passage t with an axial discharge passage n leading by way of a pipe c to the suction side of the pump. The valve o has an axial passage p connected by a pipe b with the pipe f and by radial passages q. with a peripheral groove. While the rotor is rotating the valve is held in equilibrium by centrifugal force and fluid pressure on the end face of the valve to hold -the grooves s, r more or less opposite one another so that the pressure in the pipe b varies with ' the speed of the rotor. In a modification a second radial passage controlled by a spring-loaded ball valve is provided. At high speeds the flow through the valve o is interrupted and the control is effected by the centrifugal force of the fluid in the second radial bore. Two or more bores and associated valves may be arranged in the rotor. In another form the valve co-operates with an annular seat surrounded by an annular chamber connected by a restricted aperture with the conduit b and by radial and transverse bores with the outlet passage n. This passage is fitted with a spring- loaded valve.