Patent GB-191124155-A (GB)
Title: Improvements relating to Controlling Apparatus for Fluid Pressure Motors.
Inventor: HERB HERBERT THACKER
IPC: B63H21/22
Filed: 1911-10-31
Granted: 1912-05-16
Abstract: 24,155. Herr, H. T. Nov. 25, 1910, [Convention date]. Governing motors; valve-gear.-Rotary engines or turbines are provided with throttle valves controlled by a speed - regulating governor, but hand regulation is effected by varying the load on the governor. Reversing is effected by an apparatus for rendering the fluid relays actuating the forward and reversing valves inoperative alternatively. A governor 6, Fig. 1, driven off the shaft of a turbine 1, is provided with a vertically movable rod 68 connected by suitable link-work 70, 72 to two fluid relays 24, 24<a>, Figs. 2 and 4, controlling the forward and reversing valves 2, 3, Fig. 1, respectively. The two relays are of similar construction. Assuming the turbine to be running in the forward direction and the speed to be below that for which the governor is set, the governor thereupon moves a rod 74, Fig. 2, to the left, thereby rotating a lever 75, to which the stem 52 of a pilot valve 50 is connected bv a link 76. The movement of the pilot valve permits oil under pressure to pass to the servo-motor and act on a piston 25 against the pressure of a spring 28 whereby the piston is moved to the right. The pistonrod 26 is attached to the lever 75, thereby constituting a follow-up device, and also carries a rack 27, Figs. 1 and 2, which operates through suitable mechanism a gear-wheel 14, Fig. 1, mounted on the stem of the throttle valve. For decreasing the speed a reverse action takes place. A piston valve 36, operated by compressed air, admitted through a pipe 42, alternatively interrupts communication between the pilot valves 4, 5 and their respective servomotors, thereby rendering one of them inactive. This device constitutes a reversing valve-gear. Hand regulation of speed is effected by varying the load on the governor, the movable stem 68, Fig. 1, carrying a piston 69 working in a cylinder. Compressed air is admitted by way of a pipe 77. Hand regulation and reversing, that is, the admission or otherwise of compressed air to the pipes 77, Fig. 1, or 42, Fig. 4, is effected by the combined controller shown in Figs. 5 and 6. A hand-lever 113, fulcrumed at 126, can rotate a shaft 111 and, by working between guides 115, 116, or 116, 117, alternatively place the shaft in either of two longitudinal positions. By rotating the shaft 111, a cam 110 thereon is caused to reciprocate a slide valve 97, whereby compressed air is admitted to or released from a cylinder 78 and the pressure therein is transmitted through the pipe 77 to the piston 69, Fig. 1. A piston 82 in the cylinder 78 connected to a valve 106 forms a follow-up device, whereby, for any position of the lever 113, the pressure in the chamber 78 remains constant. If the lever 113 is placed between the guides 116, 117, Fig. 6, it moves the shaft 111 to the left, thereby carrying a slide valve 118 to the left and admitting compressed air to the pipe 42 for the operation of the reversing-valve 36, Fig. 4. If the supply of compressed air fails, or the pipes are injured, each oil relay is provided with an emergency supply-pipe 130, Fig. 2, controlled by a valve 131, or a single valve may be provided for both relays for bringing either into operation alternatively.