GB262133A - Improvements in regulating means for elastic-fluid prime movers - Google Patents

Abstract

262,133. British Thomson-Houston Co., Ltd., (Assignees of Standerwick, R. G.). Nov. 28, 1925, [Convention date]. Transmitting - mechanism. - Regulating means for turbines &c. comprises a pump 21 driven by the turbine through gearing 17, 18 and pumping fluid through a pipe 24 and valve 26 to a pipe 28 opening into a cylinder 14 below a spring- pressed piston 13. The piston 13 is connected by a rod 12 to operating mechanism 10, 11 for controlling the steam supply valve 6 of the turbine. The pipe 24 has a relief valve 25 so that pressure therein is constant, and the pipe 28 has a by-pass 29 opening into a casing 31 containing a slidable ported bush 32 of a valve 36. The valve 36 is controlled by a centrifugal governor 37, so that, if the speed varies, the valve is moved to vary the escape of fluid from the pipe 29 and consequently the pressure in the pipe 28 and cylinder 14. The piston 13 then adjusts the valve 6 to vary the stream supply. The movement of the piston 13 adjusts the valve bush 32 relatively to the valve 36 by means, of linkwork 39. 38, 34 to restore them to their former relative position. The movement of the lever 39 operates a valve 49 of a connecting device C controlling a port 45 between a cylinder 43 and a cylinder 41 containing a spring-pressed piston 42. Fluid escapes from under the piston to a pipe 47 and the piston descends, pulling down the lever 39 and lowering the valve bushing 32 until the valve 49 again closes the port 45. The movement of the bushing 32 increases the pressure in the pipe 28 and opens the valve 6 a little more. The form shown in Fig. 3 is adapted for maintaining a constant fluid pressure, say, in the turbine exhaust. The lever 39 is pivoted at 52 to a lever 53 pivoted to the rods of the valve 49 and piston 42. The valve is pressed down by a spring 57 and its rod is connected to a diaphragm 59 exposed on its underside to the pressure to be controlled. Variation of the pressure moves the diaphragm and valve, allowing the piston 42 to descend and operate the levers 53, 39, 34, thereby adjusting the valve 6 to vary the steam supply to the turbine. Specifications 229,321, [Class 110 (iii), Turbines &c.] ; and 229,325 are referred to