Overspeed protection apparatus for a turbomachine

Details Overspeed protection apparatus for a turbomachine Overspeed protection apparatus for a turbomachine

1992-09-18

1994-03-08

Look, Edward K.

Rotary kinetic fluid motors or pumps

With control means responsive to non-cyclic condition...

Responsive to moving member developed fluid force, current...

60657, F01D 1700, F01D 2100

Patent

active

052922251

ABSTRACT:
An overspeed trip system for a steam turbine. A pressure switch is installed at the discharge of an oil pump that is driven by the rotor shaft and that rotates at the same speed as the rotor. The discharge pressure of the oil pump is proportional to the rotational speed of its impeller. When the pressure switch senses that the oil pump discharge pressure exceeds a predetermined value, thereby indicating that the rotor has reached an overspeed condition, it activates a solenoid operated valve that causes oil to be dumped from the line supplying control oil pressure to a throttle valve actuator. The throttle valve is spring loaded to close so that when the oil is dumped, the throttle valve closes, thereby effecting a turbine trip.

REFERENCES:
patent: 1947128 (1934-02-01), Franck
patent: 2091669 (1937-08-01), Bryant
patent: 2383219 (1945-08-01), Schwendner
patent: 3393692 (1968-07-01), Geary
patent: 3466977 (1969-09-01), Veller et al.

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