US3685791A - Trip mechanism for turbine trip valve - Google Patents

Trip mechanism for turbine trip valve Download PDF

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Publication number
US3685791A
US3685791A US137303A US3685791DA US3685791A US 3685791 A US3685791 A US 3685791A US 137303 A US137303 A US 137303A US 3685791D A US3685791D A US 3685791DA US 3685791 A US3685791 A US 3685791A
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US
United States
Prior art keywords
lever
engagement
valve
trip
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US137303A
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English (en)
Inventor
Charles C Czuszak
Richard A Worthen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
Elliott Turbomachinery Co Inc
Original Assignee
Carrier Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Application granted granted Critical
Publication of US3685791A publication Critical patent/US3685791A/en
Assigned to ELLIOTT TURBOMACHINERY CO., INC. reassignment ELLIOTT TURBOMACHINERY CO., INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CARRIER CORPORATION, A CORP OF DEL.
Assigned to FIRST NATIONAL BANK OF CHICAGO, THE reassignment FIRST NATIONAL BANK OF CHICAGO, THE LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: ELLIOT TURBOMACHINERY CO., INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K35/00—Means to prevent accidental or unauthorised actuation
    • F16K35/16—Means to prevent accidental or unauthorised actuation with locking member actuated by magnet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B25/00—Regulating, controlling or safety means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/16—Trip gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/52—Mechanical actuating means with crank, eccentric, or cam
    • F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
    • F16K31/52475—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a sliding valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B2250/00—Accessories of steam engines; Arrangements or control devices of piston pumps, compressors without crank shafts or condensors for so far as they influence the functioning of the engines
    • F01B2250/002—Valves, brakes, control or safety devices for steam engines

Definitions

  • the trip mechanism for operating the turbine trip valve to closed position includes an actuating lever mounted at one end for-movement about a fixed pivot and being provided at the. opposite end with a cam block.
  • Spring means or the like acts upon the actuating lever to move the cam block into engagement with the trip valve restraining member to move it out of restraining position for closure of the trip valve.
  • a 1 latch is provided for latching the actuating lever against such pivotal movement. The latch is moved out of latching position by means, such as a solenoid,
  • Fluid operated turbine machines are provided with a governor controlled supply valve for controlling the flow of operating fluid to the turbine.
  • the valve is operated by a governor mechanism to maintain the set point speed of the turbine regardless of fluctuation of the load demand upon the turbine. It is also conventional practice to provide a trip valve and trip mechanism to close the trip valve upon the occurrence of an abnormal condition adversely affecting the operation of the turbine.
  • the overspeed trip valve is necessary due to the fact that the governor, and particularly the actuating mechanism between the governor and speed control valve, embodies a substantial amount of mechanism having a number of moving parts whereby there exists the possibility of failure of the governor and/or the mechanism to operate the steam control valve.
  • the trip valve also serves to interrupt the flow of operating fluid to the turbine upon the occurrence of other abnormal conditions that adversely afiect the operation of the turbine, as for example, insufficient pressure in the lubricating system due to an insufficient supply of oil or failure of the oil pump or the circuitry connected thereto.
  • the trip valve is operated by a signal having an origin different from the signal operating the steam supply valve mechanism for speed control.
  • the mechanism for operating the trip valve includes a lever or the like connected to the valve and being urged to valve closing position by spring means or the equivalent.
  • This lever is restrained against valve closing operation by a restraining member normally positioned in engagement with the valve operating lever.
  • the restraining member conventionally takes the form of a pivotally mounted lever and the trip mechanism for moving it out of engagement with the valve operating lever, consists of a centrifugally operated trip pin which upon overspeed of the turbine, engages an arm associated with the lever to move it about its pivot out of engagement with the valve operating lever.
  • a solenoid has a direct connection with the restraining lever and is operable upon receipt of a signal to move the restraining lever out of engagement with the valve operating lever.
  • the signal may originate in the turbine or from another source, such as a low pressure oil switch.
  • a low pressure oil switch such as a low pressure oil switch.
  • trip structures have not consistently operated in a satisfactory manner due particularly to the lack of force applied to the restraining lever to quickly and with certainty to move it out of engagement with the valve operating lever. Also, such trip structures were tailored to the turbines individually.
  • This invention has as an object, a trip mechanism which is operable upon the receipt of a low power signal to quickly trip the trip valve to closed position.
  • the trip mechanism involves a structural arrangement permitting its use with turbines of different sizes and designs.
  • An actuating lever is mounted at one end for movement about a fixed pivot which may be mounted in a bracket structure adapted to be mounted on the turbine casing.
  • a cam block having an inclined surface is fixed to the opposite end of the actuating lever.
  • ,Force applying means such as a spring, is provided to move the actuating lever about its pivot to move the cam block into engagement with the restraining lever which serves to hold the trip valve in open position.
  • a latch is provided for latching the actuating lever against movement about its pivot to prevent the engagement between the cam block and the restraining member.
  • a signal responsive means responsive to an electrical or pneumatic or hydraulic signal moves the latch out of latching engagement, permitting movement of the cam block into engagement with the restraining member.
  • the force applied to the restraining member is of substantial magnitude due to the inclined surface of the cam block and the springs acting upon the actuating lever.
  • FIG. 1- is a view in perspective of an overspeed control mechanism embodying our invention
  • FIG. 2 is an end elevational view looking to the right of FIG. 1 and with parts in section.
  • l0 designates the casing of the trip valve which is connected in the fluid supply-line to its opposite end to the valve casing 10.
  • the spring serves to yieldingly urge the lever 15 downwardly about the pivot 17 for downward movement of the valve stem 1 l to close the valve.
  • the restraining member 25 is yieldingly urged toward the lever 15 by a torsion spring 30 positioned on the bolt 23, see'FIG. 1.
  • a torsion spring 30 positioned on the bolt 23, see'FIG. 1.
  • the trip valve is in open position.
  • the restraining member 25 is moved in a counter-clockwise direction about the bolt 23, FIG. 2, to the dotted line position, the restraining member is moved out of engagement with the end of the operating lever 15 and the same is moved downwardly by spring 19 to close the trip valve and stop all flow of operating fluid to the turbine.
  • the restraining member 25 is moved out of engagement with the lever 15 by operation of a cam structure.
  • the cam structure consists of a cam block 33 fixed to the free end of a lever consisting of a pair of arms 34, 35. The opposite ends of the arms are mounted for oscillation about a pivot pin 37, mounted in the rear wall 38 of a bracket 39.
  • the bracket 39 is mounted on a U-shaped support member 40, the legs 41 of which are welded at their lower ends to the plates 42, fixedly secured to the bearing housing 20, as by cap screws 43.
  • the bracket 39 being fixed to the support 40 by a bolt 45 and nut 46.
  • the major portions of the arms 34, 35 extend on opposite sides of the bracket 39, the free end portions converging, as shown. in FIG. 1, and are clamped together by bolts 48, which also serve to fixedly secure the cam block 33 to the arms.
  • the block 33 is formed with an inclined cam surface 50.
  • the anus 34 and 35 are disposed horizontally from the pivot pin 37 and are maintained in that position by a latch member 51.
  • the latch is mounted 'in a slot 52 formed in the front wall of the bracket 39 for pivotal movement on a pin 53.
  • the latch 51 has an inwardly extending arm 55,
  • the plunger 57 is formed with a. stem 61 extending through thearm 55.
  • A'helical compression spring 63. is mounted "on the stem 61v and interposed between the arm-55 and ianiit65.
  • the plunger 57 is formed with an enlargement f 67'eng aging the upper surface of the arm 55.
  • the arrangement is such that the solenoid is normally ener-' gized, holding the plunger in up position and maintaining hook portion 70 of latch 51 underneath a pin 71 mounted in the arms 34, 35.
  • the produced signal is effective to deenergize the solenoid 60, permitting the plunger 57 to descend, and in conjunctionwith a tension spring 72 moving the latch 51 in a counterclockwise direction about the pivot pin 53, and moving the hook portion 70 of the latch out of engagement
  • the trip mechanism embodying our invention also the signal continues to xist. It also grevents the restartmg or the operation thetnp tur signal station. f I
  • a trip mechanism for a trip valve controlling the flow of operating fluid to a turbine; an operating lever connected to said valve; and'means actingon'said lever .to move said valve to closed :position; a restraining member movable into and out of engagement with said lever and operable upon engagement. therewith y to restrain movement of said valve into closed position;
  • said trip mechanism comprising a cam structure mova-.
  • the latch 51 may be tripped by hydraulic or pneumatic means in .place of the sole noid ,60.
  • the latch tripping means depends upon the type of signal transmitted to the tripping means.
  • a trip mechanism for a trip valve controlling the flow of operating fluid to a turbine;. an operating lever connected to said valve; and means acting on said lever to y move said valve to' closed position; a restraining member movable into and out of engagement with said lever and operable upon engagement therewith to restrain movement of said valve into closed position;
  • said trip mechanism comprising a cam structure including a camlever mounted at one end for movement about a fixed pivot; a cam block fixed to the opposite end of said cam lever; pressure exerting means acting on said lever to move the same about said pivot to move said cam. block into engagement with said a restraining member; said cam block being operable upon such engagement to move said restraining member out of engagement with said valve operating lever; latch means movable into engagement with said cam lever for restraining movement thereof by said pressure exerting'means and means responsive to a signal to move said latch out of latching engagement with said cam lever.
  • a trip mechanism as set forth in claim 3' wherein said restraining member consists of a lever mounted at one end for movement about a fixed pivot; said lever being provided at its opposite end with a cam block engagable projection extending laterally from said lever in a direct parallel to said pivot.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Turbines (AREA)
  • Mechanically-Actuated Valves (AREA)
US137303A 1971-04-26 1971-04-26 Trip mechanism for turbine trip valve Expired - Lifetime US3685791A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13730371A 1971-04-26 1971-04-26

Publications (1)

Publication Number Publication Date
US3685791A true US3685791A (en) 1972-08-22

Family

ID=22476750

Family Applications (1)

Application Number Title Priority Date Filing Date
US137303A Expired - Lifetime US3685791A (en) 1971-04-26 1971-04-26 Trip mechanism for turbine trip valve

Country Status (9)

Country Link
US (1) US3685791A (de)
JP (1) JPS509924B1 (de)
AT (1) AT326584B (de)
AU (1) AU438550B2 (de)
CA (1) CA955575A (de)
FR (1) FR2136706A5 (de)
GB (1) GB1381611A (de)
IT (1) IT947333B (de)
NL (1) NL152961B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113063A (en) * 1976-12-06 1978-09-12 Vapor Corporation Mechanical stored energy positioning actuator
US4208032A (en) * 1976-11-18 1980-06-17 Mineur-Becourt SA Closing device with valve having a high speed reaction
US4379544A (en) * 1981-05-01 1983-04-12 Elliott Turbomachinery Company, Inc. Turbine trip valve mechanism
EP1630355A1 (de) * 2004-08-30 2006-03-01 Compressor Controls Corporation Sicherheitsvorrichtung gegen Überdrehzahl bei einer Turbine
EP1517007A3 (de) * 2003-09-17 2006-10-11 Dresser-Rand Company Elektrischer Fernauslösemechanismus und Verfahren zum Abschalten einer Dampfturbine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5257183U (de) * 1975-10-24 1977-04-25
JPS53128631U (de) * 1977-03-19 1978-10-12
JPS53128632U (de) * 1977-03-19 1978-10-12
KR102631243B1 (ko) 2017-06-26 2024-01-29 타이세이카코 카부시키가이샤 시린지의 개봉 확인 구조

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259357A (en) * 1963-09-06 1966-07-05 Eclipse Fuel Eng Co Automatic shut-off valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259357A (en) * 1963-09-06 1966-07-05 Eclipse Fuel Eng Co Automatic shut-off valve

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4208032A (en) * 1976-11-18 1980-06-17 Mineur-Becourt SA Closing device with valve having a high speed reaction
US4113063A (en) * 1976-12-06 1978-09-12 Vapor Corporation Mechanical stored energy positioning actuator
US4379544A (en) * 1981-05-01 1983-04-12 Elliott Turbomachinery Company, Inc. Turbine trip valve mechanism
EP1517007A3 (de) * 2003-09-17 2006-10-11 Dresser-Rand Company Elektrischer Fernauslösemechanismus und Verfahren zum Abschalten einer Dampfturbine
EP1630355A1 (de) * 2004-08-30 2006-03-01 Compressor Controls Corporation Sicherheitsvorrichtung gegen Überdrehzahl bei einer Turbine
US20060042265A1 (en) * 2004-08-30 2006-03-02 Dmitry Drob Turbine overspeed protection
US7194865B2 (en) 2004-08-30 2007-03-27 Compressor Controls Corporation Turbine overspeed protection

Also Published As

Publication number Publication date
DE2210123A1 (de) 1972-11-02
IT947333B (it) 1973-05-21
ATA330572A (de) 1975-02-15
AT326584B (de) 1975-12-29
FR2136706A5 (de) 1972-12-22
NL7204220A (de) 1972-10-30
NL152961B (nl) 1977-04-15
DE2210123B2 (de) 1974-11-21
GB1381611A (en) 1975-01-22
AU438550B2 (en) 1973-08-09
AU3859872A (en) 1973-08-09
CA955575A (en) 1974-10-01
JPS509924B1 (de) 1975-04-17

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ELLIOTT TURBOMACHINERY CO., INC., A CORP OF DELAWA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO LICENSE RECITED.;ASSIGNOR:CARRIER CORPORATION, A CORP OF DEL.;REEL/FRAME:004499/0922

Effective date: 19851220

AS Assignment

Owner name: FIRST NATIONAL BANK OF CHICAGO, THE,ILLINOIS

Free format text: LICENSE;ASSIGNOR:ELLIOT TURBOMACHINERY CO., INC.;REEL/FRAME:004940/0562

Effective date: 19871109

Owner name: FIRST NATIONAL BANK OF CHICAGO, THE, ONE FIRST NAT

Free format text: LICENSE;ASSIGNOR:ELLIOT TURBOMACHINERY CO., INC.;REEL/FRAME:004940/0562

Effective date: 19871109