| 摘要 |
1,229,978. Fluid-pressure servomotor systems. POWELL MAGNETIC INDUSTRIES Inc. Aug. 9, 1968 [Sept. 1, 1967], No.38098/68. Heading G3P. A frequency regulator for a turbo-generator comprises means 201, 208, Fig. 2 having a fluid-pressure output 217 that is a function of the frequency of the electric current in the input which is connected to the output of the generator and means 216, Fig. 3. for governing the degree of opening of a throttle valve 226 connected to the fluid inlet of the turbine, the fluid-pressure output of the regulator being a function of both magnitude and duration of the departure of the input signal from a pre-set valve. The output of the generator is connected to the primary of an iron core transformer 300 having its secondary connected to a clipper circuit 301 producing square pulses which are applied to an integrator circuit and a multi-stage transistor amplifier. The voltage output of the amplifier is proportional to the generator frequency and energizes coils 368, 370 controlling the position of a pivotally mounted soft iron armature 352 normally held at rest by a helical spring 354 acting in one direction and by bellows 356 and pressure from a nozzle 358 acting in the opposite direction, the nozzle being supplied with gas under pressure through a pipe 211 and a filter and pressure regulator 212 to a well head which also supplies the throttle valve 226. A relay valve 366 actuated by back pressure from the nozzle supplies a bellows 424 forming part of a system including feedback bellows 426 and reset bellows 428 and controlling the position of a bar 400 reulating the back pressure from a nozzle 432 of a further relay 436 supplying the throttle valve 226 through a manuallyactuated valve 222 and the bellows 426 and 428 through adjustable valves 450 and 452 which permit the amplification and reset of the controller to be adjusted. The output pressure is indicated on a scale 458 by the position of a lever 456 connected to a cam 454 which determines the static balance of the bar 400. The valve 222 permits the turbine to be connected direct to the gas supply during starting. |
