A limit switch 6 is placed on an end portion of the trip rod 4, which converts the mechanical deviation of the trip rod 4 into an electrical signal. The electrical signal from the limit switch 6 is transmitted to quick acting solenoid valves placed in a drive unit for a steam valve via a sequence ci
A limit switch 6 is placed on an end portion of the trip rod 4, which converts the mechanical deviation of the trip rod 4 into an electrical signal. The electrical signal from the limit switch 6 is transmitted to quick acting solenoid valves placed in a drive unit for a steam valve via a sequence circuit device, and then the steam valve is closed. Accordingly, an equipment structure can be simplified and reliability can be improved as compared to conventional arts.
대표청구항▼
What is claimed is: 1. A protection system for a turbo machine which detects an abnormality by an abnormality detecting unit having an emergency governor provided on a rotation shaft of the turbo machine and a latch mechanism constituted of a trip finger and a trip rod in such a manner that when th
What is claimed is: 1. A protection system for a turbo machine which detects an abnormality by an abnormality detecting unit having an emergency governor provided on a rotation shaft of the turbo machine and a latch mechanism constituted of a trip finger and a trip rod in such a manner that when the rotation shaft of the turbo machine rotates to exceed a predetermined speed and a centrifugal force of a predetermined value or larger is applied to the emergency governor, the emergency governor and the trip finger come in contact and the latch mechanism is disengaged to move the trip rod, and closes a steam valve placed on a steam inlet of the turbo machine to shut off flow-in of steam into the turbo machine, comprising: a detecting device configured to mechanically detect movement of the trip rod to generate an electrical abnormality signal; and a solenoid valve which is placed integrally on a drive unit constituted of a piston and cylinder which open and close the steam valve and a hydraulic system which introduces/discharges operating oil to/from inside of the cylinder, and discharges the operating oil from inside of the cylinder, wherein, based on the electrical abnormality signal from said detecting device, said solenoid valve is electrically actuated to discharge the operating oil inside the cylinder to close the steam valve. 2. The protection system for the turbo machine as set forth in claim 1, further comprising: an oil path which discharges the operating oil from one side of the piston in the cylinder, introduces the operating oil once to the other side of the piston in the cylinder, and thereafter discharges the operating oil; and a cartridge valve which is interposed in said oil path and opens in conjunction with operation of said solenoid valve, wherein the operating oil is discharged from the one side of the piston and introduced to the other side of the piston in the cylinder to close the steam valve. 3. The protection system for the turbo machine as set forth in claim 2, wherein a plurality of said solenoid valves and a plurality of said cartridge valves are provided respectively. 4. The protection system for the turbo machine as set forth in claim 1, wherein said solenoid valve comprises a plurality of drive coils. 5. The protection system for the turbo machine as set forth in claim 1, wherein said drive unit, comprising: an operation rod arranged between a valve rod of the steam valve and the piston; an operating spring which moves said operation rod to a valve closing position when closing the steam valve; and an oil cylinder spring housing which accommodates said operation rod and said operating spring and comprises on a lower portion a drain hole which discharges water staying inside. 6. The protection system for the turbo machine as set forth in claim 5, wherein said drain hole comprises a filter. 7. The protection system for the turbo machine as set forth in claim 5, further comprising a drain hole placed on a flange body which is attached on an end portion on the steam valve side of said oil cylinder spring housing and supports said operation rod by penetration. 8. The protection system for the turbo machine as set forth in claim 7, further comprising a raised portion formed on the periphery of a through portion of said operation rod on the flange body side. 9. The protection system for the turbo machine as set forth in claim 7, further comprising: a coupling formed on one end of said operation rod and coupled to the valve rod; and an elastic cover whose one end is fixed to said coupling and other end is fixed to the flange body and covering the through portion of said operation rod. 10. The protection system for the turbo machine as set forth in claim 5, wherein rust proof paint is applied on said operating spring. 11. The protection system for the turbo machine as set forth in claim 5, wherein a disc-shaped spring is used as said operating spring, whose spring bearing has an outside diameter that is at least approximately the same as the inside diameter of said oil cylinder spring housing to prevent a damaged spring from falling to a lower portion of said oil cylinder spring housing. 12. The protection system for the turbo machine as set forth in claim 5, further comprising a heater which is placed on at least one of an inside portion and outer surface of said oil cylinder spring housing and prevents freezing of water staying inside said oil cylinder spring housing. 13. A protection system for a turbo machine which detects an abnormality of the turbo machine by an abnormality detecting unit and generates an electrical abnormality signal, and closes according to the electrical abnormality signal a steam valve placed on a steam inlet of the turbo machine to shut off flow-in of steam into the turbo machine, said protection system comprising: a solenoid valve which is placed integrally on a drive unit constituted of a piston and cylinder which open and close the steam valve and a hydraulic system which introduces/discharges operating oil to/from inside of the cylinder, and operates based on the abnormality signal; and a cartridge valve which is interposed in an oil path which discharges the operating oil from one side of the piston in the cylinder, introduces the operating oil once to the other side of the piston in the cylinder, and thereafter discharges the operating oil, and opens in conjunction with operation of said solenoid valve. 14. The protection system for the turbo machine as set forth in claim 13, wherein a plurality of said solenoid valves and a plurality of said cartridge valves are provided respectively. 15. The protection system for the turbo machine as set forth in claim 13, wherein said solenoid valve comprises a plurality of drive coils. 16. The protection system for the turbo machine as set forth in claim 13, comprising: an operation rod arranged between a valve rod of the steam valve and the piston; an operating spring which moves said operation rod to a valve closing position when closing the steam valve; and an oil cylinder spring housing which accommodates said operation rod and said operating spring and comprises on a lower portion a drain hole which discharges water staying inside. 17. The protection system for the turbo machine as set forth in claim 16, wherein said drain hole comprises a filter. 18. The protection system for the turbo machine as set forth in claim 16, further comprising a drain hole placed on a flange body which is attached on an end portion on the steam valve side of said oil cylinder spring housing and supports said operation rod by penetration. 19. The protection system for the turbo machine as set forth in claim 18, further comprising a raised portion formed on the periphery of a through portion of said operation rod on the flange body side. 20. The protection system for the turbo machine as set forth in claim 18, comprising: a coupling formed on one end of said operation rod and coupled to the valve rod; and an elastic cover whose one end is fixed to said coupling and other end is fixed to the flange body and covering the through portion of said operation rod. 21. The protection system for the turbo machine as set forth in claim 16, wherein rust proof paint is applied on said operating spring. 22. The protection system for the turbo machine as set forth in claim 16, wherein a disc shaped spring is used as said operating spring, whose spring bearing has an outside diameter that is at least approximately the same as the inside diameter of said oil cylinder spring housing to prevent a damaged spring from falling to a lower portion of said oil cylinder spring housing. 23. The protection system for the turbo machine as set forth in claim 16, further comprising a heater which is placed on at least one of an inside portion and outer surface of said oil cylinder spring housing and prevents freezing of water staying inside said oil cylinder spring housing. 24. A power generating equipment having a turbo machine which rotates by steam to generate power and a steam valve placed on a steam inlet of the turbo machine, comprising: a protection system for a turbo machine which detects an abnormality of the turbo machine by an abnormality detecting unit and generates an electrical abnormality signal, and closes according to the electrical abnormality signal the steam valve to shut off flow-in of steam into the turbo machine, wherein said protection system of the turbo machine comprises: a solenoid valve which is placed integrally on a drive unit constituted of a piston and cylinder which open and close the steam valve and a hydraulic system which introduces/discharges operating oil to/from inside of the cylinder, and operates based on the abnormality signal; and a cartridge valve which is interposed in an oil path which discharges the operating oil from one side of the piston in the cylinder, introduces the operating oil once to the other side of the piston in the cylinder, and thereafter discharges the operating oil, and opens in conjunction with operation of said solenoid valve.
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이 특허에 인용된 특허 (7)
Kure-Jensen Jens (Schenectady NY) Coppola Patrick S. (Schenectady NY), Apparatus for individual isolation of hydraulically actuated valves.
Lesko Frederick H. (Lehighton PA) Parker Charles A. (Saylorsburg PA), System and method for regulating the speed of a steam turbine by controlling the turbine valve rack actuator.
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