US794857A - Emergency-governor for elastic-fluid turbines. - Google Patents

Description

D'. G. GARROWAY 82; A. T. GRAY.

EMERGENCY GOVERNOR FOR ELASTIC FLUID TURBINES.

APPLICATION FILED DEO.31, 1903. I

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No. 794,857. PATBNTED JULY 18, 1905.

D. G. GARROWAY & A. T. GRAY. EMERGENCY GOVERNOR FOR ELASTIC FLUID TURBINES.

APPLICATION FILED DEO.31, 1903.

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No. 794,857. Patented 18, 1905.

i NITED STATES PATENT DAVID C. GARROVVAY AND ALEXANDER T. GRAY, OF SCI-IENECTADY, NEWV YORK, ASSIGNORS ,TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

EMERGENCY-GOVERNOR FOR ELASTIC-FLUID TURBINES.

SPECIFICATION forming part of Letters Patent N0. 794,857, dated July 18, 1905. Application filed December 31 1903. Serial No. 187,286.

T all h it y nc or moving with the latch or arranged to trip Be it known that we, DAVID C. GARROWAY the latch is a tripping-lever which is located 5 and ALEXANDER T. GRAY, subjects of the King in the path of the weights or other part of the of Great Britain, residing at Schenectady, speed-responsive device and is moved therecounty of Schenectady, State of New York, by under abnormal conditions as to speed. A have invented certain new and useful Improvcspring may be arranged to move the latch and ments in Emergency Governing Mechanism tripping-lever back to the normal position as for Elastic-Fluid Turbines, of which the folsoon as the valve is released. In order to relowing is a specification. duce the number of parts and also decrease the I0 In order to prevent elastic-fluid turbines space required bythe parts, the samespeed-refrom running away or attaining an abnormally sponsive device may be employed to trip the high speed due to any cause, it is desirable to emergency-valve and also to move the govprovide emergency valves which are conernor-valve. The invention is not, however, trolled by a governor and at the proper time to be construed as being limited in this respect.

5 come into service and either reduce the sup: A resetting device is employed that extends ply of motive fluid or cut it off altogether. to the outside of the casing and has an oper- The present invention relates to emergency ating-handle affixed thereto. Between the re- 5 governing mechanism, more especially adaptsetting device and the valve is suflicient lost ed to turbines, and has for its object to promotion to enable the latter to close independ- 20 vide an apparatus which is simple in construcently of the former, and between said device tion and is efficient and reliable in operation. and an anchor is a spring which tends at all It is also the object of the invention to protimes to return it to an oil position and out of 7 vide an emergency-valve which can only be the way of the valve. By reason of this artripped from a. point or points within the rangement whatever friction exists between 5 turbine-casing and, further, that when once the resetting device and the stationary parts tripped can only be reset by shutting off the has no efi ect 0n the valve. Since the actuator supply of motive fluid. extends to the outside of the casing, it may In carrying out the invention a speed-realso serve as a means to indicate the position sponsive device is driven by the shaft and may of the valve.

3 be mounted directly thereon or be driven In the accompanying drawings, which illustherefrom by a belt or equivalent device. trate one embodiment of our invention, Fig- For convenience and simplicity the admissionure 1 is a partial vertical section of an elasticvalve may be situated in line with the wheelfluid turbine of the jet type. Fig. 2is a paraxis in order to dispense with the use of levers, tial sectional View showing the emergency- 35 &c., and the speed-responsive device is convalve in the closed position. Fig. 3 isafront nected thereto or is arranged to act thereon. elevation of the valve and the parts closely Between the admission-valve and the source associated therewith. Fig. 4: is a view in ele- 8 5 of supply is located the emergencyvalve, vation of the emergency-valve tripping-lever.

which is so arranged that under normal con- Fig. 5 is a detail view showing the spring 4 ditions it offers no opposition to the steamused for returning the resetting device to its flow. The valve is entirely inclosed and has normal position; and Fig. 6 is a detail view r the capacity for self adjustment within cerin section, showing the lost motion between 9 tain limits to compensate for inaccuracies in the emergency-valve and its closing device. alinement and workmanship. A latch nor- 1 represents the casing for the turbine,

45 mally holds the valve against a means, such which incloses the wheel or wheels 2 and also as a spring or weight, which continuallyurges the speed-responsive device. The latter may the valve in a direction to cut off the supply be of any suitable construction. In the presof fluid to the wheel or wheels. Attached to ent instance it comprises weight- arms 3 and 4 and an opposing spring 5, which is seated at one end on a disk 6, located within the wheelshaft, and on the other end on a movable abutment 7, that engages the rollers 8 of the weightarms. Situated in line with the axis of the wheel-shaft is a governing-valve 9, that is moved back and forth by the stem 10, which is connected to the movable abutment of the speed-responsive device by the slip-joint 11. The valve is mounted in a detachable sleeve 12, which sleeve also forms a seat for the emergency-valve, to be hereinafter described.

The governing-valve and sleeve are carriedby a valve-casing 13, which is bolted to the turbine-casing 1. In the valve-casing is a passage 14, that communicates with a corresponding passage 15 in the turbine-casing and which leads to the nozzle or other device for discharging fluid against the bucket wheel or wheels 2.

Mounted within the valve-chamber is an emergency-valve 16, which is loosely pivoted at its lower end to a spindle 17, extending at right angles to the axis of the shaft. The object in loosely mounting the valve on the spindle is to insure the seating of the former on the sleeve 12. Without such an arrangement there would be difficulty in insuring a good seat, owing to slight inaccuracies in alinement and workmanship. Asshown-in the drawings, the valve is pivotally supported at its lower end. This arrangement is advantageous, in that the entrance of steam to the governing-valve is unobstructed. The invention, however, is not limited to this arrangement, since the valve can be supported at other points. I

Referring to Fig. 3, it will be seen that the projection on the valve, which encircles the spindle, is provided with a slot 18, which receives a corresponding projection on the col' lar 19, which forms a part of the actuating and resetting device. This arrangement of the parts permits the valve to have a slightmovement independent of its spindle.

The actuating and resetting device comprises a spindle 17, carrying a fixed pin 20, that is located in a slot 21 in the collar19. The pin and slot are so arranged that the valve can be set in the position shown in Fig. 1 and the resetting device afterward moved to the position shown in Fig. 3 without interferring' with the valve. By reason of this construction the friction between the resetting device and the stationary parts can be disregarded.

a coil-spring 26, which tends at all times to cause it to rock the spindle 25in a direction to release the dog 23, which permits the emergency-valve toclose under the action of the spring 22. Once the'valve is closed it is held against its seat by the full pressure of the steam, and the only way it can be opened is 1 to cut off the supply of steam to the valvechamber.

Referring to Fig. 3, 28 (shown in dotted lines) represents the face of the tripping-1e ver to be engaged by the governor weightarms 3 and 4. In this-figure the governor 1S supposed to be traveling in the direction of the arrow. In order to limit the outward movement of the tripping-lever, due. to the action of the coil -spring 26, an adjustable stop 29 is provided. Changing the' position of this stop will change the predetermined speed at which the emergency-valve willclose.

In Fig. 4 is shown in elevation the trippinglever 27 and the latch 24. are rigidly connected together. noted'that the end 28 of the latch is beveled or cut away to permit the dog 19 to depress it when rotated by the resetting device.

In Fig. 5 isshown'a means for changing the tension of the spring,which moves the resetting device to' its off position; 17 represents These two parts It is to be the spindle, 30 the nut on the packing-gland,

which gland prevents the escape of steam or other elastic fluid around the spindle, and 31 a coiled spring that surrounds the spindle.

One end of the spring is attached to the operating-handle 32'or its spindle and the other end to a fixed abutment 33. This spring has a tendency at all times to move the resetting device to its initial position and out of en gagement with the emergency-valve. If (its,

sired, this spring may be omitted, in which The action of our invention is as follows? Assuming that the speed of the wheel increases abnormally until one or both of the weight-arms or part carried thereby strike the tripping-lever 27, this causes a movement of the lever inward toward the center? and a corresponding rotation of the spindle 25, which depresses the latch 24 and releases the dog 23 on the collar 19. The spring 22 When the spring is employed, the

then causesthe valve to be seated on the sleeve 12, and the steam-pressure in the valve-chamber will hold it against its seat, and owing to the fact that the valve is loosely mounted on its spindle 17 a good seat for the valve is insured.

In Fig. 2 the emergency-valve is shown in closed position and the governor-valve 9 in a more or less open position. When the parts are operating under their proper conditions, the governing-valve 9 would be seated by the speed-responsive device at or about the time that the emergency-valve closes. Assuming now that the emergency-valve is closed and it is desired to reseat it, the supply of steam tov the valve-chamber is cut off to relieve the pressure thereon. tated to the left, which causes the pin2O to engage with one of the walls of the slot 21 in the collar 19. As the collar is rotated the curved end of the dog 23 depresses and passes over the latch 24. As soon as the valve assumes the position shown in Fig. 1 the latch returns to the position shown and holds the valvein place. On relieving the pressure on the handle 32 the spring 31 returns it to the position shown in Fig. 3, which means that the actuating-pin 20 has been moved to the opposite end of the slot 21, so that it cannot interfere with the closing of the valve. This arrangement of parts is important because it reducesto a minimum theliability of the.

valve sticking at the time that it should close, and, furthermore, it relieves the spring 22 of all load except that due to the valve itself.

In accordance with the provisions of the patent statutes we have described theprinciple ofoperation of our invention, together with the apparatus. which we now consider to represent the best embodiment thereof; but we desire to have it understood that the apparatus shown is merely illustrative and that the invention can be carried out by other means.

lVhat we claim as new, and desire to secure by Letters Patent of the United States, is.-

1. An elastic-fluid motor comprising a casing, a movable element .mounted therein, a speed-responsive device, a valve for regulating the actionof the fluid on the movable element, an emergency-valve which is tripped by the speed-responsive device, a casing therefor, and a resetting device for the emergencyvalve which extends through the valve-casing.

2. An elastic-fluid motor comprising a casing, a movable element mounted therein, a valve for regulating the action of the fluid on the moving element, an emergency-valve fo'r shutting down the motor, a speed-responsive device, which moves the regulating-valve and trips the emergency-valve, a casing common to the controlling and emergency valves, and a resetting device for the emergency-Valve which extends through the valve-casing.

The handle 32 is then ro-.

resetting device which is connected thereto.

through a lost-motion connection.

5. In an elastic-fluid turbine, the combination of a valve-chamber, an emergency-valve located therein, a wheel-casing, a speed-responsive device for tripping the valve, and a means external to the chamber for resetting the valve.

6. In an elastic-fluid turbine, the combination of a valve-chamber, a casing, a valve in said casing, an actuator which extends from the valve-chamber to the casing, and a speedresponsive device which is wholly inclosed b3 the casing for moving the actuator.

7. In an elastic-fluid turbine, the combination of an emergency-valve, a tripping-lever for the valve, a speed-responsive device acting on the lever, a handle for resetting the valve, and a locking device in the valve-chamber for holding the valve open.

8. In an elastic-fluid turbine, the combination of a valve-chamber, a wheel ,chamber which is connected thereto by a conduit, a valve which closes said conduit, a latch in the valve-chamber for holding the valve open, and.

a resetting device also located in the valvechamber and controlled from the outside thereof.

9. In an elastic-fluid turbine, the combination of a valve-chamber, a wheel-chamber which is connected thereto by a conduit, a

valve loosely mounted on a spindle in the chamber, a latch for holding the valve open, a resetting device which has a certain freedom of motion independent of the valve.

10. In an elastic-fluid turbine, the combination of a governing-valve located in line with a sleeve containing seats for both of the valves,

and a speed-responsive device which successively operates the valves. 12. In an elastic-fluid turbine, the combination of a governing-valve,an emergency-valve,

a speed-responsive device which acts directly on the governing-valve and indirectly on the emergency-, valve, a latch which holds the emergency-valve open, a releasing device for the emergency-valve including a lever which &

is acted upon by the speed-responsive device, and a resetting device that is connected to the valve through a lost-motion connection.

13. In an elastic-fluid turbine, the combinav tion of a wheel, a governing-valve in line with the wheel-axis, a speed-responsive device situated between the wheel and valve for moving the latter, an emergency-valve arranged to cut off the supply of fluid to the governingvalve, and a means under the control of the speed-responsive device for causing the valve to close.

14:. In an elastic-fluid turbine, the combination of a wheel, a governing-valve, a speedresponsive device, an emergency valve, a spindle which carries a latch and extends parallel with the wheelshaft, a meansacted upon by the speed-responsive device for actuating the latch, and a spindle for supporting the emergency-valve which extends at right angles to the axis of the wheel.

15. In an elastic-fluid turbine, the combination of an emergency-valve, aspindle on which the valve is loosely mounted, a latch for bolding the valve in a given position, and a resetting device which is connected to the latch through a lost-motion connection.

16. In an elastic-fluid turbine, the combination of a bucket-wheel, a casing therefor, a chamber discharging fluid to the wheel, an admission-valve regulating the action of the bucket-wheel, a valve in the chamber for shutting off the supply of fluid to the wheel, a speed-responsive device located in the wheelcasing, and an actuator for the'shut-ofi' valve that extends through the wall of the valvecasing into the wheel-casing and is adapted to be engaged by the speed-responsive device.

17. In an elastic-fluid turbine, the combination of a valve-chamber, a wheel-casing, governing and emergency valves for controlling the passage of fluid from the chamber to the casing, and means extending through the wall of the valve-chamber into the casing for actuating the valves.

18. In an elastic-fluid turbine, the combination of a valve-chamber, a valve located therein, a means for closing the valve, a latch within the chamber for holding the valve in one of its positions, and a means extending through the wall of the chamber for resetting the valve and the latch.

19. In an elastic-fluid turbine, the combination of a valve-chamber, a valve located therein, a means for closing the valve, a latchwithin the chamber for holding the valve in one of its positions, and a means extending through the wall of the chamber for simultaneously resetting the valve and the latch.

20. In an elastic-fluid turbine, the combination of a valve-chamber, avalve located therein, a means for actuating and resetting the valve which is loosely connected thereto, and an actuator which is loosely connected to said means.

21. An elastic-fluid turbine comprising a bucket-wheel and casing, in combination with a valve-chamber, an emergency-valve located therein, an actuator for closing the valve, and a latch for holding it open, the latch and valve being located in the chamber.

22. In an elastic-fluid turbine, the combination of a bucket-wheel, an emergency-valve controlling the passage of fluid thereto, a spindle upon which the valve is loosely mounted, a handle for imparting rotary movement to the spindle, and a connecting means intermediate the valve and spindle, arranged to transmit motion from the spindle to the valve but not from the latter to the former.

23. In an elastic-fluid turbine, the combination of a bucket-wheel, a casing therefor, a shut-off valve mounted in the casing which is tripped from a point within the casing and is unbalanced when closed, so that the supply of fluid has to be cut off before it can be opened, and a means for resetting the valve when the pressure thereon is relieved.

In witness whereof we have hereunto set our hands this 29th day of December, 1903.

DAVID C. GARROWAY. ALEXANDER T. GRAY.

Witnesses:

BENJAMIN B. HULL, MARGARET E. WOOLLEY.

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