Speed control system for a prime mover
First Claim
1. A speed control system for a prime mover having a main drive shaft extending therefrom mounted for rotation at a controlled rotational speed;
- said system comprising;
a main control valve mounted for longitudinal movement to selectively vary the amount of fluid to said prime mover to control the rotational speed of said main drive shaft; and
a governor operatively connected to said main control valve to control the movement of said main control valve in response to the rotational speed of said main drive shaft;
said governor having hydraulic fluid means operatively connected to said main control valve to effect movement of said main control valve and including a hydraulic fluid pump driven from said main drive shaft for the operation of said fluid means, and electronic control means responsive to the rotational speed of said main drive shaft and transmitting output signals to said hydraulic fluid means to effect movement of said main control valve to a predetermined position;
said governor including an electric generator having a generator shaft driven from said main drive shaft to supply electrical energy to said electronic control means.
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Accused Products
Abstract
An electronic governor (34) to control a main steam valve (22) of a steam turbine (10) for controlling the rotational speed of a main drive shaft (16). The electronic governor (34) has a housing (36) in which an electric generator (104) is mounted to supply electrical energy to an electronic module (100) mounted on the housing (36). A hydraulic fluid pump (52) is mounted on the housing (36) and supplies fluid to a fluid operated piston (62) to effect a predetermined rotation of an output control shaft (32) and movement of main steam valve (22). Output signals from a microprocessor (116) to solenoid operated valves (96, 98) control the movement of fluid operated piston (62). Pump shaft (46) and generator shaft (48) are in axial alignment with and driven by the main drive shaft (16) to provide all of the power for operation of the electronic governor (34).
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Citations
16 Claims
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1. A speed control system for a prime mover having a main drive shaft extending therefrom mounted for rotation at a controlled rotational speed;
- said system comprising;
a main control valve mounted for longitudinal movement to selectively vary the amount of fluid to said prime mover to control the rotational speed of said main drive shaft; and a governor operatively connected to said main control valve to control the movement of said main control valve in response to the rotational speed of said main drive shaft;
said governor having hydraulic fluid means operatively connected to said main control valve to effect movement of said main control valve and including a hydraulic fluid pump driven from said main drive shaft for the operation of said fluid means, and electronic control means responsive to the rotational speed of said main drive shaft and transmitting output signals to said hydraulic fluid means to effect movement of said main control valve to a predetermined position;said governor including an electric generator having a generator shaft driven from said main drive shaft to supply electrical energy to said electronic control means. - View Dependent Claims (2, 3, 4)
- said system comprising;
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5. An electronic governor for controlling the rotational speed of a rotatable main drive shaft of a prime mover comprising:
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an outer housing; an input shaft extending within said housing and arranged to be driven from said rotatable main drive shaft; an electric generator within said housing having a rotatable shaft driven from said input shaft; and an electronic control means supplied with electrical energy from said electric generator. - View Dependent Claims (6, 7, 8)
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9. An electronic governor for controlling the rotational speed of a rotatable main drive shaft of a prime mover having a main control valve to control the flow of fluid to said prime mover for rotation of said main drive shaft;
- said governor comprising;
hydraulic control means for said main control valve including a hydraulic fluid pump driven from said main drive shaft, a fluid operated piston operatively connected to said control valve to effect selective movement of said control valve, and fluid lines for said piston to supply fluid to opposed ends of said piston from said pump; electronically operated valve means for said fluid lines to permit the supply of fluid to said piston selectively from said pump; electronic control means operatively connected to said electronically operated valve means for selective actuation of said electronically operated valve means to control the flow of fluid to said piston, said electronic control means being responsive to the rotational speed of said main drive shaft and effective to vary the rotational speed of said main drive shaft by selective actuation of said electronically operated valve means; and said governor having an electric generator to supply electrical energy to said electronic control means for operation thereof, said electric generator having a generator shaft driven from the main drive shaft of said prime mover. - View Dependent Claims (10, 11, 12)
- said governor comprising;
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13. In a turbine having a rotatable main drive shaft and an electronic governor for controlling the rotational speed of said turbine, the electronic governor having a housing with an input shaft driven from said rotatable main drive shaft and a fluid responsive piston operatively connected to a steam valve to control the flow of steam to the turbine;
- an improved electronic control means for said governor comprising;
an electrical power source within said housing of said governor operatively connected to said input shaft for driving of said electrical power source to provide the sole energy supply for operation of said electronic control means; said electronic control means including means responsive to the rotational speed of said turbine for actuation of said fluid responsive piston to control the flow of steam to said turbine. - View Dependent Claims (14, 15, 16)
- an improved electronic control means for said governor comprising;
Specification