US1294497A - Pump-governor. - Google Patents

Description

L. D. LOVEKIN.

PUMP GOVERNOR.

APFLlCATlON FILED FEB. 23. 19l6.

1,294,49 Patented Feb. 18, 1919.

4 i T/75'"- 5 X T@ l- U3 @mum/woz Strom/w13 LUTHE t D. LOVEKIN, OF PHILADELPHIA, PENNSYLVANIA.

PUMP-GOVERNOR.

Specication of Letters latent.

rateneea rea is, raie.

Application filed February 23, 1916. Serial No. 79,856.

To all whom t may'conccrn:

Beit known that l, LUTHER D. LovniirrnV a citizen of the United States of America, and a resident. of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented a certain new and uset'ul lmprovement in Pump-Governors, of which the following is a true and' exact description, reference being had to the accompanying drawings, which form a part thereof.

My present invention consists in an iinproved pump governor for 'automatically regulating the supply of steam to the driving element of a steam pump in response to the pressure at which the liquid pumped is discharged from the pump. The object of my invention is to provide a governor for the purpose specified, characterized by its simplicity, and by the absence ot` frictional resistance, and particularly of stutiino box resistance to its operation whereby a cesirable sensitiveness and accuracy, as well as reliability of operation, are assured.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming apart ot' this specification. For a better understanding of theinvention, however, and the advantages possessed by it, reference should be vhad to the aconipanying drawings and descriptive matter in which I have illustrated and described a preferred embodiment of my invention.

Cf the drawings:

Figure l is a sectional elevation-of a preferred embodiment of my invention;

Fig.l 2 is a somewhat diagrammatic representation of a pumping unit provided with my improved governor; and y Fig. 3 is a view taken similarly to Fig. l of a portion of a governor of slightly modified construction.

rThe pump governor construction illustrated in Fig. l is collectively designated by the reference symbol A. This governor, in the form shown, comprises a steam valve casing ybody B formed with an inlet chamber B and an outlet chamber B2 connected to` gether by alined ports B2 as is usual in balanced valves. The balanced valve member C controlling the Vports B2 is provided with valve stem extensions or piston portions C and C2 at opposite sides of the valvel disks. The stem extensions C and C2 work in guide chambers B4 and b respectively. As shown, the chamber B4 is formed in an integral extension of the valve body B, while the chamber b is formed in a bonnet member secured to the valve body B and closing an opening in the side of the inlet chamber B in axial alinement to the pont-s B3. rThe guide chamber b opens at its outer end into a larger chanlber b2 formed in the bonnet member Z). Steam or water of condensation leaking along the valve stein C2 through the chamber 7) passes into the chamber b2, and steam or water ot condensation leaking along the valve stem C into the outer end of the chamber B4 also passes into the chamber b2 through thel leakage passage C2 formed in the valve stem. rllhe steam or water ot condensation passing into the chamber b2 escapes through the pipe O. The valve stem C2 projects through the outer end of the chamber Z22. To prevent leakage along the valve stem C2, under certain conditions,

as hereinafter explained, a stuffing 4box b2' is provided at the extreme outer end of the member The steam valve B is connected to the wall of the pressure chamber E by a cutaway barrel or cage member D which surrounds the outer end of the valve stem C2 and an alined extension of the latter formed by a member Gr ovhich is secured to the valve stem C2 by the coupling H. rhe member Cr bears at its lower end against the floating piston F working in the pressure chamber E. The delivery pressure of the pump is transmitted to the lower end of the chamber E through the pipe K. lThe lower end of the member Cr fits in an open ended guide chamber or sleeve J formed in a member J which closes the otherwise open upper end of the chamber E. The member J is formed with a chamber J2 surrounding the sleeve J and in direct communication with, and really forming an enlarged extension of the chamber E. The chamber J2 receives liquid which leaks past the piston F in the upper end ot' the chamber E. The liquid passing into the chamber J2 escapes from the latter through the pipe P. To prevent leakage ot air into the chamber J 2 along the stem extension G under certain conditions hereinafter explained, a stutiing box J2 is formed -at the upper end ot the member J. The upward thrust of the stem extension G of the floating piston F is opposed by the loading spring l surrounding the rod (it and bearing at its upper end against the. transverse portion D of the member D, and at its lower end against the adjustable nut G threaded on to the member G.

To restrict leakage While at the same time avoiding appreciable frictional resistance to the movement of the valve member, the piston portions C and C2' vWorking in the guide chambers B and ZV, are advantageously formed with shallow steam and Water grooves C3. Similarly the portion of the stem member G Working in the sleeve d is provided avith grooves G2, and the'loating piston l? *with grooves F. lhile l ordinarily prefer to employ the governor with the valve member C and piston lil vertically movable as shown, it vvill be understood that this is not strictly essential.

in Fig. 2 l have illustrated the use of my governor to control the operation of an ordinary reciprocating steam pump for pumping Water into a tank, fuel oil to burners, or generally where it is desired to maintain a constant deliverj,7 pressure of the liquid pumped. in the pump shown in Fig. 2, L represents the pumping cylinder and LA the steam motor cylinder. The delivery pipe l from the cylinder L is connected to the lower end ot the chamber E by the branch pipe l. ln this torni oiE my invention the pipe P ior conveying leakage aivay from the chamber le is connected to the suction inlet pipe l? of the pnn ning cylinder L. The steam supplyv pipe s connected to the inlet chamber B of the am valve il. and the outlet chamber B2 o the steam valve is connected to the valve or the steam cylinder lil-l. ot the motor by the pipe section nl. ln this 'forni of my invention the esfape pipe for the steam and irate passing into the chamber 32 is connected to the eX- haust pipe iii? ifi-om the steam cylinde LA.

lilith the construction describe will be apparent that the rictional resistance to the movement of the valve member C in instant and direct response, to variations in the pump delivery pressure acting against the lower end ot the piston l", is reduced to a practical minimum. rlhe stem G while constantly bearing against the floating piston F is pieferably not mechanically connected thereto so that there is no tendency ot' the parts to cramp or bind. lhe parts are so constructed as to facilitate an accurate alinement and thus avoid all cramping and binding. 'l`lie elongated contactsurtaces between the vvalls ct' the chambers B4, 2; and l, and the interior of sleeve el and 'the parts Working therein, especially when the latter are toi-ined with the steam and water grooves as shown, make it possible to keep the leakage down to a relatively small amount, withoutY requiring a lit close enough to introduce appreciable'friction.

rllhe stuiiing boi: L is provided to pre' vent leakage of air into the chamber lf2 and its discharge into the exhaust pipe lvl", which Would be objectionable When the latter is connected to a condenser as is frequently the case, especially tor marine Workw Similarly, the stuiling box J3 is provided to prevent the leakage oi' air into the chamber J2 and its discharge into the pump line. The stutlng boxes b3 and J3 may be made effective to prevent. an objectionable leakage ot air under the conditions of use referred to, While offering a frictional resistance to the operation of the device Which is but a small fraction ot that which would exist in practice, if the stuiing boxes were employed to prevent the escape of steam from the steam valve B, and the escape of the liquid pumped from the pressure chamber E.

lllhen either of the pipes O and P discharges against atmospheric pressure as each may well do in many cases, the corresponding stuliing box may be omitted, as in the construction shown in `Fig. 3. ln the last mentioned ligure, the member ba, replacing the member b of Fig. l, ditlers Jfrom the latter in the omission ot the stuiling box o and the member JA, replacing the member l ot Fig. l, diliers from the latter in thc omission oi" the stuiiing bon da. l

l' nile in accordance with the provisions or' the statutes l have illustrated and described the best form of my invention now known to me, it will be apparent-to those skilled in the art that changes can be made in the form ot' my invention Without departtroin its spirit, that some features oi my invention can be used without a corresponding use ot otiie-r features oie the inatents, is:

l. A pump governor comprising in combination a valve casing divided into inlet and` outlet compartments and formed with alined valve spindle guide chambers, one of which has an open outer end for the passage ot the spindle, and both of which have vented chambers for collecting and discharging fluid leaking along the guided spindlef of the valve whereby it is made possible avoid the use oi'. tight packing, a balanced valve member in said casing provided with spindle portions working as pistons loosely held in said spindle guide chambers, and an external automatic valve controlling means operating on the valve spindle eX- tending through its guide.

2. A. pump governor comprising in combination a motive fluid valve casing divided into inlet and outlet coini'iartments and termed with alined guide chambers leading away from the interior oi' said valve casing and termed onev'ith a closed, and the other with an open outer end, a valve member in said valve chamber provided with piston portions Working in said guide chambers and formed with a leakage passage leading from the outer end of the guide chamber having the closed end through the piston portion Working in the other guide chamber, and an external automatic valve controlling means engaging and operating said valve member through thefopen end of said open ended guide chamber, said casing having provisions for collecting and freely discharging leakage luid passin to the open end of said open i ended gui e chamber through said leakage passage or by leaking past the piston portion Working in said chamber.

3. A pump governor comprising in combination, a housing formed With a motive fluid valve chamlber divided into inlet and outlet compartments, a pressure chamber open at one end and provided with a pressure fluid inlet to its oppositel end, and guide chafmfbers leading 'away from said valvle chamber and one closed and the other open at its outer end, said guide 'chambers being in alinement With each other and with said pressure chamber, a valve member in said valve chamber provided with piston portions Working in said guide chambers and formed with a leakage passage leading from the outer end of the guide chamber having the closer. end, through the piston portion ivorlfncf in the other guide chamber, a piston no g in said pressure chamber and an opi, connection between said piston valve member operating through ythe open ends of the open ended guide chamber the pressure chambei', said housing being formed with provisions ior collecting and freely discharging leakage fluid passing to the open end of said open ended guide chamber through said leakage passage or by leaking past the piston portion Working in said chamber, and leaking past the piston Working in said pressure chamber.

4. ln combination a pressure iluid driven motor with suppl)7 and exhaust connections thereto, a pump driven by said motor and having suction and discharge connections avid thereto, and governing mechanism for said` motor comprising a valve casing in said supply connection formed with alined guide chambers leading away from the interior of said valve casing one of said guide chambers being open at its outer end, a valve inem'ber in said valve chamber provided with-piston portions Working in said guide chambers, means placing the outer ends of said guide chambers in free communication `vvith said exhaust connection, a pressure chamber connected at one end to said discharge. connection and at the opposite end to said suction connection, a piston Working in said pressure chamber and an operating connection between said piston and valve member Working through the open end of said open ended guide chamber.

5. In combination a fluid pressure motor with supply and exhaust connections thereto, a pump driven by said motor and hav-- ing suction and discharge connections thereto, and a `governing mechanism for said motor comprising a valve casing in said supply connection formed with alined guide chambers leading away from the interior of said valve casing, one of said guide chambers Ibeing open at its outer end, a valve member in said valve chamber provided with piston portions working in said guide chambers, a pressure chamber open at one end and connected at its other end to said discharge connection, a piston Working in said pressure chamber, an `operating connection between said piston and valve meinber Working through the open ends of said pressure cham'ber and said open ended guide chamber, means placing the outer ends of said guide chambers in free communication With said exhaust connection and means connectingthe open end of said pressure chamber to said suction connection.

G, A pump governor comprising in combination a motive iluid valve casing element divided into inlet and outlet coinpartments and formed With alined guide chambers leading away from the interior o said valve casing, a second casing element formed with a pressure chamber in alinement with said guide chambers and open at its end adjacent said guide chambers and having a fluid inlet to its opposite end, the outer end oi'l the guide chamber adjacent said pressure chamber being open and the outer end of the other guide chamber being closed, a spacing elementbetween said casing elements, a valve member in said valve chamber provided With piston portions Working in said guide chambers and formed with a leakage passage leading from the outer end of the guide chamber having the closed cud through the piston portion Working in the other guide chamber, a piston Working in said pressure cham'ber, an operating connection between said piston and valve member Working through the open ends of the pressure cham- 'ber and adjacent guide chamber, said valve casing element being formed with a vented chamber for collecting and discharging illuid passing through said leakage passage or leaking past the piston portion Working in said open ended chamber, and said second casing element being formed with a vented chamber receiving the leakage past the piston working in said pressure chamber.

i'. A pump governor comprising in comlbination a motive fluid valve casing element divided into inlet and outlet compartments and formed with alined guide chamgrs,

said guide chambers Open ai: adjacent said guide chfdmbefs am?. hav

*l f Sme chamba@ and @panting Con- ;tmcon bet/Ween said Qson Valve mem- "ge Working hrough 15h@ onen ends of 'he nesue chamber and.' jacent guide charm be?? an adjustable loading device acting between. said connecon and said Spacing eie- O thev ge clambeadjacen 5 1d 13smani, Said 'valve Caslg dement being sur@ Chamber be open md "che outef 1d :L01 med with n veut/ed chamba? for Collecting of the @they gui CD :aber being cosx.j @Ld discharging Huid passing though said Spacing element beweer; sai@ casing passage or leaking past the piston malts, a, valve memb in Sac vave Ch@ olm n'olkug said Open ended Chamber podsd poons W0? in Suid l 'i ad formed W1 .l leakage "ih/e oue? El@ ver? and sam Second @Sing eementbeing formed Wh a ven-Gd chamba? receiving -he 30

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