US963107A - Governing mechanism for turbines. - Google Patents

Description

G. H. WORSEY. "GOVERNING MECHANISM FOR TURBINES. APPLICATION FILED 1330.20.1906.

Patented July 5, 1910.

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limyenhor? Hirifiay G. H. WORSEY. GOVERNING MECHANISM FOR TURBINES.

APPLICATION FILED DEC. 20, 1906. V 963,101 Patented July 5, 1.910.

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Witnesses:

Inventor; 6 Charles H. arsey G. H. WORSEY. GOVERNINGMEGHANISMFOR TURBINES.-

APPLICATION FILED DEO.20,1906.

Patented 'July 5, 1910.

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cHAnnEs H. WOBSEY, or LYNN, uassacnusn'rrs. ASSIG-NOB 'IO GENERAL ELEoTmc comranmnconromirron or NEW YORK.

Gov-Ermine MECHANISM FOR TURBINES.

A 1 cu whom it may concern: I

Be itlknown that I, Cnaiinrs H. WoRsEY,

" a citizen of the United Statesf i'esiding at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in't'iroverning Mechanism for J Turbines, of whic-lithe following is a specification.

" and tlie'actual work of opening and closing one or more ofthe succeeding stages." The I The preseiit invention has for its object to provide a. governing mechanisin of lll1 proved construction wherein the load 011' the speed governor is reduced to a minimum one or inoreadmission or stage valves is er: formed by a suitable source of power sue as the shaft of the machine being governed.

In carrying out'iny-invention, one or more valves are provided to control the passage offluid to one orn ore nozzles or otherfiuid discharging. devices. avhich may direct 'the. passage of fluid into the-first'stageor into valve or valves'ai e actuated by a constantly moving means driv'eirby the l llalll'slltlft of the turbine, and interposed .between said shaft and the valves is a wedgetor changi n the effective action of the shaft on the the claims appended thereto.

In the accompanying drawings which illustrate embod ments of my invention, Figure l is a view in side elevation of the governing mechanism attached to a turbine;

Fig. 2 is amodit ication of the governor controlled means for determining the movements of the valves; Fig. is a vertical section' through the regulating valves and mechanism for actuating them; Fig. 4' is a sectional view taken on line 44'. of Fig. 8;

gFi 5 is a iersiective view of a wed e member that is set by the shaft. governor; Fig. 6 15a section taken on line =6 of Fig.

4; Fig. 7 isga section taken on line 7-'7 of Fig.3; Fig. 8 is a section taken on line'8.-8

of Fig. 3; Fig. 9 is a section takenon line 9 -9 ofFig. 3 showing the relation between the'driving eccentric and the parts of the wedge member at one point in the stroke Jfig. 1-0 is'a sectional view showing a slightly modified: form of wedge member; and Fig.

.t-ubular shaft 15.

extending ro Specification of Letters Patent. -Pa'tented July 5, 1 Application filed December ao,'1 9os. Serial No. 348,729.

11 shows a means for preventing undue wear on the wedge member. s

.Refierringto Fig. 1, 1 represents the casing of a turbine of the elastic fluid type, which may be of the reaction, impact, or other type. In the present illustration my invention is applied to a machine of the Curtis type. Mounted on the front of the turbine casing is a valvechest 2 having an inlet 3 connected with a suitable source of supply.

. 4. represents a casing surrounding'the speed governor, which governor is driven by the main shaft of the tiirbine as will appear later. Located inside of the valve chest are one or more regulating valves and an emer-- gency valve mounted on a stem attached to the arm .5. 6 is a handle for re-setting the emergency valve and 7 is a spring which tends at all times to close the valve when tripped or released. 8 is a trigger mounted o i'the rock shaft land actuated by an emergency: governor for tripping the emergency valve when the speed exceeds a e'er-' the latter beiiig-iiioved to and fro by an eccentric under the control of a governor, as will appear more -fully in connection with the succeeding figures.

Referring to Fig. 3, 13 represents the speed governor acting by centrifugal force and inertia to raise or lower the rod 14 as the load changes. The rod passes through a tubular shaft 15 having a worm wheel 16 keyed thereto. This wheel,ineshes witha XYOILULllilHLh-JS drivenby the maiii shaft of the turbine, or a double speed reduction may tain predetermined amount. The regulating valve or valves are mounted onthewertieaily extending stenilt), whiclf'stein is moved vertically by arm 11 on the rock shaft, 12,

be provided as in Fig. 10. The gearing is inclosed in a suitable casing having a removable cover 18 giving access thereto. Situated below-the ivorm wheel is a ball bearin 19 for taking up the thrust on the vertica Mounted on the tubular shaftand keyed or otherwise ri idly secured thereto is an eccentric 2O whic rotates -a predetermined number of times per miniite'; Mounted on the shaft and turning with it but arranged .to slide freely thereon is a collar 21. This collar is connected by a. transverse iii 22, Fig. 8

d 14 connected to the governor,

to the vertically-.105

and hence rises and falls with speed changes. The pin 22 works in a vertica in the tubular shaft.-. Secured to a loose ring 23 is a wed e member com rising oppositely dispose wedges- 24 an tom, but where the strains are considerable they will'be connected both top and bottom.

The ring 23 and the upperends of wedges are separated from the shaft by a space so that they will not offer resistance to the rotation of the shaft at this point or require lubricant. The wedges are so shaped that the angle of inclination is less than the angle of-fricti'on so that the action of the eccentric thereon will not impart vertical movement to the rod 14 and thus interfere with The wedges are provided with slots 26 which receive the collar 21 that rotates with the shaft and is actuated by the governor.

Extending downwardly from the' casing surrounding the gearing is a frame 30 whichforms a support for the sliding cross-head 31, the latter being moved to an fro by the eccentric.20 the dove-tail uide s 32, as.

shown more particularly in iig. 6. The

" cross head is pivotally connected to the up right lever 33 that is mounted on the rock shaft 12. It will be seen that the lever 33,

rock shaft 12 and forked arm 11 form a bell crank lever for actuating the valve stem 10. Attached to the underslde of-the frame13O is the ca ing 33 of a gear pump for supp ying luhr' ant to the various bearings of the l turbmea m ore valves.

agai'ns'tthe buckets.

Mounted on the valve stem are one, two or Inthe present instance three balanced valves are-shown 34, 35 and 36,

which are so arran ed that they can assume intermediate th'rott in positions. Each one of these valves contro sthe passage of motive fluid fromthe valve chest2 to the nozzles or other fluid discharging-devices of the turbine. As shown' the valves are mounted one above the other on the same stem and are inclosed by a sleeve 37, the latter having accurately 'formed ports 38 communlcatlng with passages 39 leading to the nozzles or other devices discharging fluid Theaction of my improved governing 'mechanism is as follows: Assuming that the loaddecreases, the speed of the bucket-wheel and shaft 17.,will rise and the governor will raise the rod -14 and the collar 21 attached thereto This'rcsults"in setting-the wedge member in anew position where-the part 25 'will. on the-first turn of the eccentric force 2 the cross-head to :the right and raise theyalve stem 10 and shut the valve at the critical point in the regulation by, a greater-0r less amount. ,As-shown, valve 34 is closed valve-'35 is at the critical point and would slot formed.

25. The wedges are shown connected together at the top by the ring and unconnected atthe botthe proper action of the governorf -90 ahead of,.the l shaft.

31' having'suita close first, and valve 36' is wide open. The

Itwill be noted that the eccentric can move.

the cross-head to the right once for every for every revolution, or it can revolve without moving itin either direction according to the position assumed by the wedge m emher. It also fellows that the governor can Assuming that the revolution, or it can-move it to the left once either freely raise or lower the said member twice during each revolution of the eccen-- tric because the latter is out of engagement therewith. Each revolution ofthe eccentric may be divided into four arts, first'where the high spot engages wit the. wedge 24; second, where it assumes a position ahead of that shown in Fig. 9, and. the governor is perfectly free to move the'wedge member without opposition .due [to frictional engagement of the parts; third, where it engages the wedge 25; and, fourth, where itis ast-mentioned position and the governor is -free'to act.

In 1 3 '2 is. shown a slight modification where a wedge. member comprises two.

wedges -24 and 25 as before. These are con- I.

nected by stra s40 at opposite ends and the strap ont e right'is connected by a system of links-and levers 41- with the speed governor.- In Fig. '3 .the wed e member moves longitudinally of' the to ular shaft -15 while in. Fig. 2 t'is moved transversely thereof. p

In Fig. 10 is shown a further modification. 42 represents'a low-speed shaft having a gear 13 thereon meshing with a pinion located in'bz'lck thereof, .The pinion is mounted on a suitable shaft and 1s driven by worm gearing 44.- from the main turbine driving and the driven shaft. The'shaft 42 is provided with suitable bearings mounted n the casing 45,-the]atterinclosing-the gean v .Thls arrangement means that there is a=double"reduct10n in speed between the mg. Splinedon' the shaft-isa slete lfi, and

thelatter is moved to and f-ro by alever' t? connected tofthe speed governor. Mounted onthe sleeve 46 to revolve therewith. and held againstlong'itudinal movement by a shoulder at oneend'and arnut 48 at the 'other, is an eccentric .49. Surrounding the eccentric is a wedge member'ffitf which is J25 -prcvented.-fromaxially moving independently of'the eccentric by the nut and the shoulder holding the said eccentrio' In-- closing thewedge member is across-head leguides-for directing its J30;

trio of seam? 3 movements. The opening through the cross head may in cross section be cylindrical or otherwise formed. The operation of the apparatus is "as follows: T he shaft 42 is con- 'stantlyrotated by the turbine or other source of. power and, with it move the sleeve and eccentric. In the position shown, the

valve or valves on-the stem occupy defis aft 1 4 loh i side. As the shaft revolves, the cocentric leavestlie-s,iii"r'ace of the wedge member'o'n'the; upper side and taking up the clearance 51 111st touches the surface oii the lower side, without however moving .the

a valve. or valves. Moving the wedge member in either dii 'ec'tion will actuate the'valve stem IO'accordingIy.

redl'ICiHgTth wear on the surface of, the

-\ve es adjacent the eccentric. The eccentric 20 is' mounted on the shaft/15, and surrounding the eccentric is a'guide-block 52 having generous wearing s'nrfaceson oppo {site sides for engagement with the parts 24 and 25 of the wedge member. V v

1 Iiracc'ordan ce'with the provisions of the patent'sta'tute's, I have described the principle of operation of my invention, together with the apparatus which I. now consider to represent the best embodiment thereof;

butldesire it to be understood that the apparatus shown is only illustrative, and

"that'vthe inventioncan be carried out by other means; v a

flwhat I claim as new and desire to secure by v iet'teifs Patent of the United States, is,-

, It In a governing mechanism, the combination of a regulating valv'e, a shaft, an

eccentric mounted on and moving with the shaft, a ovcrnor-controlled means that is interpose between the valve and the eccentric adjacent the. periphery of the latter to be engaged thereby for transmitting motion from the latter to the former, and-a device for guiding said means to move rectilinearly under the control of the governor.

2. In a governing mechanism, the combination of a regulating valve, an actuator ata tachcd thereto, a shaft, an eccentric-having a constant eccentricity mounted on and moving with the shaft, a means for transmitting motion from the eccentric to the actuator,

-which is engaged by the periphery of the eccentric an ,valve with respect-to its ort.

by its position determines the direction and extent of movement of the valve, a device for guiding said means to move rectilinea'rly, and a governor which adjusts the means rectilinearly in accordance with the load to vary the position of the .3. Iliad governing mec anism, the

combination "of [a valve, an actuator for moving .head t 111M. if I v 7. Ida governing mechanism, the combimoved by the governo qoositely disposed and c nnccted wedges, and

the valve, an eccentric driving device, a

governor, and a wedge member in engagement. with the actuator and the device which is acted upon by thc governor to bring dificrentportions .of said member into action to vary the extent and direction of move ment imparted by the actuator to the valve.

4. In a governing mechanism, the combi- 5; ha governing mechanism. the combination of a valve, a .constantlvrotating memher, a governor, a means receivinginotiou In Fig. 11 is shown anarrangement for from the member and transmitting it to the.

valve, and; a wedge member. forming 1 the sole connectionbetween the rotating member and said means which controlled by. the

governor and determines ltheextent and-direction of movement iinpartiedlby the sa d meansto thevalve. A

, 6. In a governingmechanism, the, combination of a plurality-of valves, an actuator direction and extent of movement; of, the f cross-heaihsaid means forming the, sole con-e nection betweenthe device and the fr'rossr nation of a valve, a rotary shaft, a governor, a reciprocating cross-head:attached to the valve, tlIlfiCCOl'ltlllQ-Oll the-shaft adapted to move the cross-hcad,;and. a wedge member:

under the control of the governor,wwhich is directly engaged; the periphery of the eccentric and by its position determines the direction and cXtent; -o -movement ofthe cross-head.

8. In a governing nation of a valve, a-rotary low-speed shaft, a governor, a cross-head attached to the valve, a wedge member mountedto slide on the shaft. means for preventing the wedge member from rotating, a device secured to the shaft for actuating the cross-head through the medium of saidmembcr, and a connection between the governor and the wedge member for transmitting mot ion from the former to the -1attcr,.

9. In a governing mechanism, l ll(5,(3()lill)lnation of a valve, a governor, an actuator for tlidvalve, a shift, a wedge member and comprising -opa means on the shaft which moves the valve ilfh echanism, the combimember bv.an amount and in a direction determined by the position ofthe governor, said member receiving motion-directly from said 'nieansand transmitting it to the actuator. v.

n10. IIna governing mechanism, the combi- V nation of a valve, a speedgoverno'r', a crossheadcohn'ected to the valve for moving it,

afrotaryshaft, a means for transforming the rotarymot-ion of the shaft into reciproeating motion of the cross-head, a device interposed between and directly engaging :the means andthe cross-head. which determines the direction and extent of movement of the latter, means for-preventing the devieeifrom rotating, and-aconnection fox; transmitting motion from the governor to I said device.

' 11. In a governing mechanism, the combination ofa valve, as eed governor, a drivmg shaft,-a low speed s aft, gearing between the shafts, a cross-head connected to the .valve, means for transmitting motion from the low-speed-shaft' to the cross-head includin a double wedge movable length-' wise-o theshaft,means for preventin the wedge from rotating, a collar. adjustab e on" theshaft for moving the wed e, and .a con motion for transmitting motion from the governor. to the collar.

12.11: a'governing m'echanism,the e'om-' bination of anvalve, aspeed 'governor, a shaft, an eccentric device on the shaft, a-

crossshead for moving. the valve, guides therefor, a double wedge upon-which the device acts directly totransmn: motionto the cross-head, and a connection between the governor and wedge fo'rregulating the movement of the valve. I

13. In a. governing mechanism, the combination of a*.valve,-'a speed governor, a

shaft, "a means driven thereb an actuator for thevalve, a wedge com rising members posite sides 0 the said' means located on o and opposite y disposed, said members forming a direetconnectionbetween the means"- and the actuatorfor transmitting motion from one to the other, and a devieeactuated by the governor for simultaneously movin the wedge members to vary the aetion 0 said means .on the actuator.

' 14. In a governing mechanism, the combination' of one ormore balanced regulating valves, an actuator'attached thereto, a;

driving shaft, a wedge member in engage- ,ment with the actuator and movable longitudinally with respect-to the shaft, an eccentric located within the member, said member being en ged by the periphe the eccentric, and agovernor for shi ing the member toand fro so that the eccentricwill move the valve or valves in one diree ,tion or the other to satisfy thelo'a'd' re quirements. 15. In a governing, mechanism,- the combination ofone or more regulating'-valves,-

an actuator attached thereto, a low-speed Shaft,

interposeddi'rectly between the eccentric and ditions require. In witness whereof, -I.have hereunto set my hand this seventeenthdaybiDecember, 1906.' v

. CHARLES H. WORSEY." Witnesses: i-

JQIIN A. MoMANtis, Jix', Pn1r-1P HARRINGTON.

or close the valve or valves as the l0ad=c on-

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