GB734810A - A pneumatically actuated governor for regulating fuel flow to an internal combustionengine - Google Patents

Abstract

734,810. Gas turbine plant. GARRETT CORPORATION. April 17, 1953 [May 2, 1952], No. 10552/53. Class 110 (3). [Also in Group XXIX] A pneumatically-actuated governor for controlling the fuel supply to a gas turbine engine in dependence on the ratio of the pressures on opposite sides of the engine compressor and also on the ambient air temperature comprises a casing 26 having a chamber divided into two compartments 27, 50 by a movable wall such as the flexible diaphragm 49, a valve 33 operatively connected to the movable wall and adapted to control a passage 25 connecting the compartment 27 on one side of the wall with a fluid-pressure actuated fuel control means V, and means such as the bellows 53 for modifying the actuation of the valve 33 by the movable wall in response to changes in the ambient barometric pressure and temperature. The turbine T has a combustion chamber 10 supplied with air by the compressor C and with fuel by a nozzle 11 supplied by a pump P. The compartment 27 is exposed to the outlet pressure of the compressor by a pipe 40 and the compartment 50 is open at atmospheric pressure through a port 51. The fuel pump P has a by-pass 12 regulated by a diaphragm-actuated by-pass valve 23 controlled by the valve 33. The control chamber 19 of the by-pass valve 23 communicates by the passage 25 and a restriction 30 with a passage 29. A recess 28 below the restriction 30 communicates with a vent passage 31 adjustable by a metering valve 32. The bellows 53 comprises inner and outer walls, the space between which is charged with air or other suitable medium to detect also changes in the atmospheric temperature. The head 54 of the bellows is exposed to atmospheric pressure and is loaded by a spring 64 which can be adjusted by a ring 65 screwed into an openended sleeve 66. The sleeve is clamped in spaced relation to the end cover 48 by screws 67. The valve 33 is opened against a spring by a screw-threaded stem 55 which is adjustably connected to the diaphragm 49 and to the head 54 of the bellows.' Thus by slackening a nut 59, the stem 55 may be rotated in a nut 56 clamped to the diaphragm 49 so that the central area of the diaphragm is raised or lowered and the effective area of the diaphragm decreased or increased. The stem 55 may be raised or lowered to alter its position with reference to the valve 33 by rotation of a nut 61 mounted in the bellows head 54. The interior of the bellows is open to atmospheric pressure through the clearance 58 between the end cover 48 and the stem 55. A single-walled bellows may be used in some cases.