US1021213A - Throttle-valve for turbines. - Google Patents

Description

j UNTTED STATES PATENT QFF-CEf 4ammini) H; RICE, or LYNN, MASSACHUSETTS, ASsIGNon -To ieuv.'.1\rn1z.ar.'rrnnc'rnic COMPANY, A CORPORATION or NEW Yonx. n i

THROTTLE-YALVE FOR TURBINES.

To all whom it may concern:

Be it known that I, RICHARD H. RICE, a citizen of the United lStates, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Throttle-Valves for Turbines, of whichthe following is a specification.

This invention .relates to valves for Controllingthe supply of motive fluid to elastic fluid turbines and isillustr-ated as lapplied to turbines which are driven by the exhaust steam from high pressure reciprocating engines. The turbine is provided with a throttle valve which is controlled by a'speedlresponsive device. Apilot valve, actuated by said device, governs the `flow of fluid pressure to a movable abutment mechanically connected to the throttle valve. Sometimes it is not desirable'to use the exhaust steam to actuate said abutment because the pressure and amount of said exhaust steam are subject to wide fluctuations.

My invention therefore provides for a supply .of high pressure live steam to the chest of the pilot valve for the purpose of moving the throttle valve but is not limited to that particular fluid. However, by using live steam the operation of the throttle'X-'alvel tion with the accompanying drawing, in

whichz-A ,Figure 1 is a vertical section of the valve mechanism; andFig: 2 is a diagrammatic representation `of the engine, the turbine and the connecting piping. A

Referring first to Fig. 2, the reciprocating engine 1 is ysupplied with high pressure vlive steam through the main 2, controlled by the valve 3. y The'eichaust steam conduit 4 may lead to anescape pipe-,but provideclosed, the exhaust conduit1- being-l extended to al low pressure turbine 7. The; oymof Patented' Mar. 26.11912.

"'50 pipe 5 with a stop-valve (iso that itcan be the exhaust steam to.,said'.turbin'ej,1s`l ,con-

trolled by a stop 'valut-a8.l The conduitfll has a terminal flange.' y,which it canbe attached to the flanged2 noz'zle`10lon checas-- lower portion 11 of said casing is cylindri- `cal in order to lit into ,an opening `iiil'fthe.

turbine. This portion. of vthe' casing delar throttle valve `M which coperateswh ports 15 in the wallslof ,saidcasingf 'A'llie rim of the valve is p rovided`-with` packing -rings 16, while the -hub '17, which is connected with the cylindrical' "rim'byl the spokes 18, is mounted on'an' upright stem 19. A certain amount ofjplayis allowed between the stem andthe walls "of the open- -ing in 'the hub, so that 'thevalvecan shift laterally to make up'for lack of proper alinement due to distortion o r other causes.

The stem 19 passes up through a hushed openin in the bottom of a cylinder-i20 which 1s east integral with the lid21; of the casing. A. packed piston 22 fits steamtight in said cylinder, and is secured to the upper end of the stem. A piston-rod 23'extends Aup through the head 24 of the cylinder, the .joint being made steam-tight by packing 25 compressed 'in a stuffing-box by a gland26. An arm 2T is securedito the upper end of the piston-rod and engages with a vertical guide-way 28 rising from the head 24.

Ports 29 extend from each end of the cyl.-

inder to a valve chest formed -in' a sleeve 3 0,

inserted in a hole drilled in a thickened portion of the cylinder. A pivot valve 31 plays lengthwise" in said sleeve and controls :the admission to and exhaust from said ports of suitablefluid Y pressure, preferably live .1... n....ww .fk....;:-. ...um ,fn-a-w... ...naar

steam, running fromthe main 2, and Acontrolled by a globe-valve 33. Tliepilot valve is preferably-.a double-piston valve, as shown, 'and its atern`34 is connected by a link 8 5 withY a floating Alever 36,1)ivoted at 37 to the arm 97 and at the other end .tol a link 38 connected to abellcrank lever 39. A'. speed-resionsive device 40p driven by theturbine s aft, is connected to said bell crank' lever, preferably by the link 41 and elbow lever42.

The operation of the device is as follows: The' partsareshown' with the throttle valve wide open, admitting the exhaust steam from theiconduit- 4 to the steam chestot the trbine. .'If the speed of the turbine exceeds a' predetermined limit, the speed responsive device 40`lifts the pilot valve, the v lever iulcrumingat 37, This admits s tem above the piston 22, which at once de scends and causes thetlirottle valve 14 vto partly close\tlie ports .15.' The steam below the 'piston exhausts through the. pipe 43; The descentof the arm 2T pulls down the lever 36,jwhich now fulcrums on'v the link 38. This 'pushes down the pilot valve, which shuts Aoi'thesteam and the throttle valve stops'. If the turbine continues to gain in Y repeated again and-f again vuntil the throttle valve has closed to point at which the turbine resumes its normal speed. Any

slowing down of the turbine below its nor.

inal speed will -produce a contrary effect and'open the throttle sufficiently to couiiter- -act the drop in speed. l

Itwill be observed that this valve with its casing, operating mechanism, and follow-up mechanism, can Vbe `constructed in the shop .as a. complete device and then mounted upon A.the turbine. This x greatly facilitates its manufacture.

Furthermore, the parts are simple, and .can be easily-'assembled It is lunnecessary topack the stem 1 9 where it passes' from-the cylinder 2O into the casing 11 because any steam leaking through will flow directly into the turbine and will be #utilized advantageously therein. i In accordance with the patent statutes, I have described the principle of operation of my inventiointogether with the apparatus which I now consider to represent the best' embodiment thereof; but I desire to have it understood that the apparatus shown is be carried'out by other means.

only illustrative and that the invention can W'hat I claim as new and desire to secure 5 byLetters Batent. of the United States, is

l. enmibinatnwitlra turbinehaving a steam provided '-'witfli an'V opening. of .a throttle valve, a casingiherefor having z r 'cylindrical flower `iortion depending through said 'opening an provided with ports a tribute-i .v-.ive movable in said casing a hat which is supplied-.throughapipe 327,.-

4"tonin the cylinder, a piston rod which also W'ardly from the cylinder, avalve controlder', a lever-for operating said valve, -and a pivotal connection between the lever and the projecting end. of the rod. i Y

2; The combination'with a turbine having fa. steam chestprovided' with anopening, of at-hrottle valve, and a'casing therefonhaving a cylindrical lower portion depending through said. opening and provided with ports, a tubular valve movable in said casby the lid, a p iston in said cylinder, :india stem connecting'said pistonand vajlve, said play on said stem. w

3. The combination with a low pressure turbine, of a throttle valve for controlling the admission of motive' Huid to the` turbine, a' casing forjthe valve,a cylinder carried by rod which is also vconnected to the turbine valve and forms a stem for the{l la.tter, 'a source of high pressure steam, a-valve for steam from said source to the cylinder to cylinder valve, a speed responsive device connected-,to the lever, and a pivotal connection between the lever and the pison rod.l

f1. The combination with a tui,"

throttle valve therefor,. a casingj'for the piston in the cylinder for opergating'said valve, a piston rod which also forms a stern for the valve, a pilot valve for controlling with said lever, 'and a bellcrank lever mounted on'the casing and pivotally connected with said tloatin'o lever.

6. The combination o? a casing having a cylindrical lower vportion provided with ports and a chamber abovesaid portion, means supplying steam to'the chamber, a

trols the How from the chamber through the tin. 'the cylinder, a Apiston rod which also :the casing,a'v cylinder on the lid, a pis` vf orms astem for the` valve and projects out-- valve' having a certain amounto f lateral.

controlling the supply 'of highgpressure.

Voperate the piston, a lever for operiiting said valve, a cylinder carried by the casing, a

a 'pilot valve for said cylinder connectedI valve in the cylindrical portion which con-- ports, a lid. on the-chamber end of thecas-l ing. a. cylinder carried by`the lid, a piston.

tling the supply of motive fluid t o the cylin' ing, a lid for saidA casing, a cylinder carried the casing, a piston in the cylinder, a piston ine, of. a

the admission of steam to the cylinder to forms. a stem for the valre and l-)rojects a speed responsive device, and a eonnectlon outwardly from4 the cylinder, a guide for 'between sad'dev'ice and the lever. 10 the outer end of the rod, a lever pvoted to In Witness whereof, I have hereunto set l, .the outer end of said rod, a valve forconmy hand this 20th day of September, 1909.

"trolling the` flow of motive fluid t0 the cyl- RICHARD H. RICE. index to operate the-piston, 'a stem for Asaid Witnesses: valve arranged parallel to the rod, a link :Torn: A. MCMANUS, Jr., connectingthe end of the stem to the lever, CHARLES A. BARNARD.

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