US936261A - Governor for motors. - Google Patents

Description

WITNESSES H. E. WARREN.

GOVERNOR FOR MOTORS.

APPLICATION FILED AUG,20,1908.

v Decree of frcuurc due to o Mru'ny .9112.

64 441 J wt/49;,

Decreqie in sp ed q m m!- INVENTOR.

A TTORNE Y.

Patented Oct. 5, 1909.

T e i s PATEN I FI E- HENRY n. WARREN, or ASHLAND, tms saofiosn'r'rs,,assrenon1T0 THE Loivisanh reovnmron company; or AsnLAnn', massacnosmrs, te oozaronsrron or NEW: v

JERSEY.

eovnanon. roe MOTORS. a

Specification of Letters Patent- Patented Oct. 5, 1909.

Application filed August 20, 190 8 Serial No; 449,405;

To all whom it h g amm- Be it lmown that-I, HENRY E VVARREN',

.a citizen of the Un-ited States of America,

residing at Ashland, in the county of Middlesex and Commonwealth of hflassachusetts,

rhave i'n'vented certain Improvements inGovernors for Motors, of which the tollowmg 1s va specificat on. I

The invention relates to governors for fluid pressure motors, and is especially applicable to turbine wheels operated'by Water Twhicli is conveyed to them through very long penstocks orfeed pipes, as is frequently the case in modern water power' plants;

where the feed pipes maybe several hundred or even thousand feet long. I In connectibnwvith these long pipes thexaction of 3 the usual governor 1n opening the watergate in response toa sudden increase in load on the wheel, 1s temporarily nullified so far as br ng ng the speed hack to normal, 18 con-,

cerned, for when the water outlet is enlarged by suddenly opening the gate, the

' pressure in the feed-pipe is reduced to a greater or less extent, first immediately atthe gate; and if it is opened very, quickly the pressure will be reduced substantially to zero, for a 'shortinterval, due to the inertiaofthe water in the pipe, This reduction of of the water wheel and cause the usual gov pressure will still. further reduce the speed ernor to open the-"gate still farther to compensate for such reduction. As soon as the velocity ,ofthe water in the feed-pipe has increased sufliciently to bring the pressure upon the wheel back to normal, .its output will be greatly in excess ofthatneeded to meet the increased load which caused the reduction of speed, and consequentlythe speed will increase unduly and cause the governor to close the gate suddenly and in excess of the amount needed, thus increasing the pressure in .t he feed-pipe abnormally, frequently producing water-hammer toa dangerous degree, and always carrying the speed of the wheel much higher than would be the case,

i with a corresponding motion of'the gate, if

the water pressure remained constant.

The purpose of this invention is to overcome these objectionable features by placing the valve, which is normally operated by the governor to regulate the speed of the water-wheel, at all times under the independent influence of a device which is responsive to variations-ofthe water pressure in the feed-pipe, sjo that the efiect of the p to variations of speed will be' modified through said pressuredevice by the term 'pora-ry disturbances in the pressure of the water at the wheel, caused by the movements of the gate induced by the action of the speed-governor, and such modifications will be produced'independently of the speed governor and of its valve -,controlling movements.

- In the drawings which illustrate a simple and desirable form of the mechanismap- I plied to a governor. for a water motor by which the action of thegovernor, due to changes in speed of the motor, is modified by the change of presshre of head of water n the feed-pipe lnduced b such action of the governor,- is f Wha is termed in French, a se'lwo-motetlrwhlch intlns instance action of the governorvupon said valve due is the gate operating mechanism controlled v by the'valve D, the movement'of'which is Y i primarily regulated'by, its. connection with.'-

the fly-ball governor F which is operatively vconnected with" the shaft of the motor M by a belt d.

P isthe penstoclr" or feed-pipe for the motor. a

Q Conveniently attached to the frame of the servo-motor G is a cylinder C within which is a piston 13, the rod f of which is pivotedto one end of a floating leverfb,'jthe opposite 'end of the lever b is pivoted to the rod 6 which extends down fromrthe fly-balls F to thelever 6, between the two ends of which the rod is ofthe' valve D is pivoted. Within the cylinder 0, a springs-is placed between t the piston e and the head of the cylinder,

belt a connecting with another pulley l, driven byapinion 0, which engages a rackg,

attached to the rod r of a piston within the servo-motor G.

f Under-normal conditions the pressure of the Water in the penstock P, through pipe 41, raises the piston 6 so as to partiallv compress thespring s; then when a sudden increase in load on the turbine wheel M occurs, the dei "e'ause -ajsud'dehffil1 in; the pressure of the .15 secondary efiectiof further opening, of the leverib turning dn its connection with rod z' .f' c'rease in' speed is cenimuz'iicated t i'the flyiodr, tp pper the motor gate.

balls {Fg which acting through the rod, 5- amilevr b, which tuil'llS 0h .its ebnnectien with,

thejrb'd f as a fulcruih', m0v e' sthe 1"051 and I -valve D upward so as tb 'operigite thes'e 'yo-fi fn ietor Gin a dii ection ind'icatedhyaa jrowat i Thieulti- 'matelmmvoifld increa'sefihet power-h of the matc but in practice it is found thatthis inctetgsed opening of the Watergate will wziter in the feed-pipe .P. fatnd fcbnsequeritly,

;mementari1y a decrease in speed. andfpower ta'chment to the piston eiwith its red f' d own war d, as indieatedjby an arrow, which action through the the vitlve so its to o'perhteutheservo-meter G iifa direkctihnid te id co-close the Watep-j gate, thus] independently ni difying the .iD- ito the servo-motor Gr, which will tend to pressii eggiawater in'the pipe c e se l raise the. piston-e, jthiit .rdf;

fiirther Lopri the gate, By{thi's"meahs the mittingfiracing iii' the n'iotorilf. 'Whenithere s ta s udden decrease 1n;load;i

m micated through the 'fly-ba11s F and valve v This inf independently of the 1 pee in the" cy ni'dr 1c; and through the lever b and ref will independently of the flj -ball gove'rnerl and 'YVithOIlt changing the position thereof, tend ,td modify" 01 partially neutral ize'thelettect ofthe fiy-b'alls' on the valve D,

pressure in thepipe Preturns to no mailg 1 cla m:

ing tendency ivill Continue until the water It. In governing*n echanisin-fofhydraulic motors, the C OmbiHiIt'iOIi :Qff a valve which.

regulates the s ipply 0t inqtiveliquidtogthe motor to be governed, ai speediljesppp sivefief vice driven-by the motdg,e piieesuiie respqnsive device subject t6 the p 'es'sure of the mocontrol :the DTQVQIIILQIiiE. Of= sdid' "kl awe, j. which meaii's are at all times silhie ctito agtuatioh by either l'of said device's independently; of (the other; ant throiighwhih a, mbven ient ,of the ;are adapted, in" respgn'set9 sheh vaitiatgimi's, Z

to actuate the valveindepehderitlyuf the chietb ,the increase 0'1" s'peed,'and thi niodif'yr {50 the liqui hear: to 'the 'mhtor, and -i1teanskto 6b

Images