GB114836A - - Google Patents

Abstract

114,836. Fulpius, E. March 31, 1917, [Convention date]. Void [Published under Sect. 91 of the Act]. Centrifugal governors; fluid relays.-A governor for hydraulic motors, such as turbines, comprises a centrifugal weight 5 slidably mounted in a chamber 2 in a pulley 1 and attached to a valve 7, which normally cuts off one end of a servo-motor cylinder 19 from the liquid pressure and exhaust passages 13, 14 in the trunnion of the pulley. The centrifugal movement of the weight 5 is resisted by pressure liquid admitted to the outer end of the chamber 2 by a passage 16 and pipe 21 from a chamber 22. The chamber 22 is supplied from the pressure main 17 and the liquid escapes from it past a throttle valve 25 attached to a piston 26. This piston is pressed down by a spring 33 enclosed between it and another piston 27 adjustably connected to a lever 29, which is connected to the piston 20 of the servo-motor and actuates the sluices of the turbine through the spindle 29<1>. The action of the governor may be adjusted by means of the baffle 23 in the pipe 17 and the handwheel 30<3> and screwed spindles 30<2> of the piston 27. The action of the piston 20 on the pistons 27, 26 may be varied by moving the nut 31 relatively to the fulcrum 29' of the lever. The piston 27 is exposed to the same liquid pressure as the piston 26 by means of the pipe 34. In the form shown in Fig. 2, the centrifugal weights 1<5> act through levers 1<6> on valves 5<1>, 5<2>, which rotate with the governor and control liquid pressure and exhaust passages 17<1> and 18. Normally, the valves close these passages and the piston 20 is stationary, but when, owing to an increase of speed, the weights 1<5> move the valves to the left, pressure liquid passes from the main 17 to both sides of the piston 20 by the passages 17<1>, 19<1>, and, by differential action, moves the piston 20 to the left. The piston actuates a lever 29, which operates the turbine sluices and moves a valve-rod 25 controlling passages 26<1>, 26<2> in a piston 26, so that the inlet passage for pressure liquid from a pipe 17<2> is opened, and the liquid enters the chamber and moves the piston 26 against a spring 33, thereby returning the valves 5<1>, 5<2> to normal position. A decrease in speed moves the valves to the right and connects the right-hand end of the cylinder 19 to the exhaust pipe 18, so that the piston 20 moves to the right and opens the passage 26<2>, thereby connecting the chamber to the exhaust pipe 24 and allowing the spring 33 to move the piston 26 to the left. In a third form, a piston is mounted on the rod carrying the valves 5<1>, 5<2> and is exposed on the outer face to the liquid pressure in a chamber between two pistons connected by a tensioned spring. The valves control the pipes leading to the two ends of the cylinder 19, and the pipe 17 communicates with the space between the valves.