US948228A - Centrifugal pump. - Google Patents

Description

`KROGH. GBNTRIPUGAL' PUMP.

APPLICATION FILED JUNE 14, 1905.

Patented Feb. 1,1910.

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INI/ENTOR omhz..

vl Bv TTRNEY P. w. KROGH.

A GEITTRIFUGAL PUMP. APPLIOATION FILED JUNI'. 14,V 1905.

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vCe-@paxm ATTORNEY Patented Feb. 1, 1910.y

4 SHEETS-SHEET L Br r! o@ C?. C? 'di ATTORNEY T. w. KROGH.

` GBNTRIIUGAL PUMP.

APPLICATION FILED JUNE 14. 1905.

W/TNESSES:

s-UMTEDSTAT FERDINAND w.' xRoGH, or 4sAN- FRaNeIsco, CALIFORNIA.'

Be it known vthat I FnnnINANn W, KnoGI-I a citizen of theAv United States, residing at No 250G Sutter street, SanlFrancisco,-1n the county' of. San Francisco and State of Calilfornia, have invented certain: new and useful parts from the same.

My invention consists in the peculiar and novel construction of the ,lnterlor of pump.

casing'so arranged as to meetthe circumference of impeller, causing, by its deviation from'middle or true runnmg'posit-ion, the

discharged .wateror 'liquid to forcethe im, vpeller to return to its correct position, as

' will be furtherdescribed,,andpointed out in the claims. I attain thisl object in the mannerillustrated in accompanying drawings, in which- Y Figure 1 is a side elevation of a horizontal type of pump, partly infsection'; Fig. 2 is an end elevation 'of the'same; Fig. 3 shows a vertlcal .type'o'f the same pumppartly section; Figs. 4, 5, and lG show a partly en- -larged view ofv nnpeller, "1n relation'to pump casing and liow'-`.tl1e discharged vwater or liquid would have its course partly:diverted.v

Fig. '7 and Fig. '8 are vp art''i-la'nsand sectionalelevations. respectively showing the curved volutes, 10, in forml oflribs on the outside of impellcr, 1;-.1l"ig. 9 is'a.part elevation of impeller, 1,*showing thesesame volutes or ribs, 10,'iny end viewggFig. 10 and -Fig. 11 are part plan-and' sectional eleva.-

tion, -x'iespectively showing lthe .curved volutes,`l 0;y in'lform 'of half-round grooves on the outside -of impellcr 1; and F.ig. `12 is "a 'part lelevation `of 'impeller-showing these same volutes, l0. as' half-round, grooves in end view; Fig. .lftshows an elevation cfa lvertical type of the samepump, having a' single impeller .and otherwisecontainmg the same features as Fig. 3.

` Similar numbers refer to Vsimilar parts 'throughout the' several. views.

` Fig. l shows the general construction ofy thehorizontal type of centrifugal pump, the

sa impeller l, which is here shown, of the inclosed or hollow type, allowing the water or l v.Specificationo1!Ltterslatent. Patevnted'Feb. 1, 1910. AmnicatiqnnieBuinen, 1905. .-seriai No. 265,135..

I liquid pumped to' pass through its hollow or central 'partand 'discharge at its periphery or eXtreme circumference', as is usual. The periphery or circumference of impeller is asshown reinforced by a ring' or rings 2, 2, preferably. of steel or other durable material, shrunk on or otherwise securely fastened; coincident with this ring or rings 2, 2, the pumpcasing has also ring or rings 3, 3, `'sprung in .and securely fastened to projecting ribs 4, Il, extending all around the 'interior of casing, and forming a running joint with .rings 2, 2. The rings 3, 3, are preferably o fjsame material as' those used on impeller` 1, and-they might be placed in the position as shown in drawing, which is better adaptedfor the purpose intended;

these rings might-also have other shapes' than squareg'and should be securely fastened .tol the'casing with screws or rivets.

It is clear in referring to Fig. l, that as the Water or liquid is drawn in through the suctionelbow, 5, forming part of suction pipe, and the impeller'isdrawn over toward the ysuction side of pum' although this movement ispartly arreste by the communi-V eating passages, 6, 6, allowing the suction or vacuum effort to equalize on both sidesof impeller underneath or inside 'the packing rings, '7, 7, yeti as this equalizing elfrt is only partial, however, and does vnot prevent mtheim-peller 1, moving from" its true and central running position, it is clear', as more fully set forth 1n' views 4, 5 and 6, that the -movement of impeller from its central position will 4cause the'water or liquid, as discharged to be partly Athrown against@ the inner wallsof pump casing, 12, thus forcing theimpeller `over toward its Atrue position, whereas, simultaneously,- the water or liquid 'which may be inclosed on the other side of impeller will 'be drawn out and pass away with the ldischarged water or liquid; thus the discharge action of pump has a natural equalizing effort on impeller, as well as the suction action. A

Referring to Fig. 3 and Fig.'13, inwhich a vertical type' of pump is shown and where the Weight of impeller l, with shaft 8, may be quite considerable and where a. pump of this type is Working as is usual against. considerable heads, it is very essential that a reliable'equalizing medium sl'iould obtain. Should the impeller V1, with its shaft S. owing to their weight, fall below the central running position of sald nnpeller l, it is clearV that the discharged waterexerting av kmaterial force andV getting on thereverse lower Side of said impeller, will cause a materiallifting force seeking to sustain the weight of moving parts. Y

-In drawlngs, Fig. 3 and F 1g. 13, a half 'ball 9, is shown .at the lower extremity ofv V'driving shaft 8. This' half'ballwill serve as a' support for the weightof impeller with shaft 8,.'etc.,`when atrest, but it- 1s not 1n tended to sustain .the Weight of above parts when running. lThe rim of impeller 1, to-

gether with the corresponding portion of pumpcasing, 12, being 'protected4 in the manner shown by rings 2, 2, and 8,3, form a very durable yinnovation from Wear owing to the gravelly sandy and impure state .of

'water generally pumped.

Referring to Figs. 7, 8, 9, 10, 11, and 12,

in which the volutes 10,-ribs or half-round `grooves are shownin detail, they will in conjunction with the central volutes, or

` webs of im eller 1, form a very potent factor in thebe ore explained balancing of impeller, tendin to ap ly with great force the reactionary frce Ao the discharged Water or liquid; the constructionyof these volutes,

-10, in theV form of ribs or grooves, I know to be old, and I do not claim the same broadly, butby the application of the same in' connection with the peculiar and novel construction of inside of casing,where the steel protected circular ribs (4, 4) of same meet the steel protectedvdisks. of impellerl, forming a runnin ]oint efficient results are obtained.

V*W here t e hollow or inclosed type of the t impeller is used,'3 distinct chambers are thus formed, the central one between disks of impeller, the other two, one on each side of impeller, andwithin the casing 12. The central kchamber formed by the disks of im- 4 A peller, operates as the dischargeV medium of pump, .and the two outer ones on each side of the impeller 1, being the field in which the balancingmeans on impeller 1, exert their force. Where the single'impeller is used, as in Fig. 13, two chambers only are formed, as it is believed that the same will suiiice in this class of pum s, and it is lain that' similar working con itions will o tain as vwith the Y double or inclosed impeller.

, ring detacha ly secured to sai ledge of the impeller, in combination with a.

k"cutis: M y y 1. In a centrifugal-pump, .an impeller Hav-ing thus described my invention, what VI claim anddesire to secure by Letters Pathaving protection on 4the-.discharge edge thereof, said rotection consistin of a metal discharge stationary casing having' a circumferential 4rib on the inside of the same, and said rib" having protection on its edge, said protection consisting of a metal ring detachably secured to the edge of the rib for .the p urpose specified.

peller under lateral 2. In a centrifugal pump, the combination of a casing provided with an annular rib on its interior surface, a metal ring secured to said annular rib, an impeller mounted to revolve in said casing,bearings for the said impeller, a metal ring surrounding the said impeller arranged to forma running joint with the ring of the annular rib, and separate means for causing the impeller to run in its central 4or normal position in said bearings. j

3. In acentrifugal pump, the combination of' a. casing on its interior surface, an-impeller arranged to revolve therein, bearings for the impeller arranged to permit Vthe impeller to move laterally to allow water to flow to the back. side thereof to. equalize the pressure on the said impeller and cause the same vto run centrally in the casing, and means on the back side of .the impeller for increasing the reactionary eff'ect of the water-thereon.

4. A' centrifugal, turbine or similar pump or motor having an inclosed impeller mounted to permit sidewise movement of the Aimressure, and with the side walls of theimpe ler and of the delivery ed and ,arranged to open the impeller at its periphery to one `of Athe chambers on the opposite. sides of the impeller when the impeller is moved vsidevvise from its normal position.

5. In a centrifugal, turbine or similar pump or motor, the combination with an inlclosed impeller, of ashaft carrying said sage leading from the casing, a lateral y sliding impeller adapted to rotate in the casin 'and close communication between the'sai chambers and the delivery passage, when running in its normal position, but to open communication `therebetween when moved laterally out of said normal position.

7 In a centrifugal pum the combination of a casing, an impelier therein, said casing having chambers formed therein at each side of the impeller near its periphery,

passageways leading from said chambers and merging into thepassageway for the jet .of water issuing from the 'impellers, and

means for controlling the said passage-ways so as -to counteract 'the end thrust.

8. In a centrifugal pump, the combination of a casing, an impeller in the casing,

provided with an annular rib passage surrounding theimpeller construct- 1 p said casing havinga chamber formed there- 'in at each side of theimpeller, said cham bers being in communication with the dis-y charge'ot` the impeller, and means for overning the pressure in each of said cham ers to counteract the end thrust. p

9. In a centrifugal, turbine, or `similar pump or motor', the combination with an impeller shaft mounted to move endwise under unbalanced pressure, a casing having .chambers on opposite sides ofthe im eller,

of balancing means controlled by sai end- Wise movement to increase the one or the other` of theside cham ers on op# posite sides of the impeller according to the direction of the endwise movement of shaft.

ressure in the '10. A centrifugal, turbine, or similar pump or motor having an inclosed impeller mounted to permit sidewise movement under lateral pressure, a casing having chambers ron opposite sides of the impeller, and means controlled. by said sidewise movement for varying' the pressures in the chambers on opposite sides of the impeller to balance the pump.

- In Witnessfwhereof, .I `havel signed my name to this specification in the presence 'of two subscribing Witnesses.

FERDINAND W. KROGH.

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