US890662A - Multistage centrifugal pump. - Google Patents

Description

m. 89.0;662; PATENTED JUNE 16. 1908.

GLLAGER. MULTISTAGE- GENTRIFUGA-L'PUMP.

APPLICATION FILED MAR. 19, 1907.

'3 SHEETS-SHEET '1.

No. 8,90,662 PATENTED JUNE 16, 1908.

.0. men, 'MULTISTAGE GENTRIPUGAL PUMP.

A'BPLIGATIONII LBD MAR. 19, 1907.

s sums-41mm 2.

No. 890,662. PATENTBDVJUNE 16, 190 0. LAGER.

MULIISTAG'E GENTRIFUGAL PUMR APPLICATION FILED MAR.19, 1907.

3SHEETS-SHEBT a.

oF IcE;

CARL LAGER, F BALDWIN SVILLE, NEW YORK.

MULTISTAGE GENTRIFUGAL PUMP.

To all whom itmay concern:

Be it known thatI, CAR LAGER, of'Baldwinsville, in thecounty of Onondaga, in the State of New York, have invented new and useful Improvements in Multistage .Centrifugal Pumps, ofwhich the following, taken in connection with the accompanying drawmgs, is a full, clear, and exact description.

This lnvention relates to certain improvements in multi-stage centrifugal pumps referring more particularly to the construction of the impellers and to the inclosing case "in which the impeller chambers are formed.

The essential object of my present invention is to simplify the general structure of the pump and at the same time to increase 'its working efficiency byreducing the number of parts and locatingtjhe diaphragm and water passages .there'through in a plane at one side of the main body of the partition so that the water, ways may be readily milled and cleaned from obstructions which might i'nterferewith the free passage of the Water and therebv cause excessive friction.

so Y A further object is to construct the imipellers in such manner; as to automatically counter-balancethem and their driving shait against end thrust and at the same time to a longitudinal vertical sectional view taken on line- 2-2, Fig. 1, except that the driving shaft is shown in elevation. Fig. 4 is an end view of one of. the detached intermediate case sections constituting one of the -parti 'tions which divide the interior of the casing into compartments. Fig. 5 is a sectional view ta lien on line 5 Fig. 4. Fig. 6 is an end view of one of the impellers, and 7 is a sectional view taken on line 7-7, Fig; 6. Fig. 8 is an endview of a slightly modified form of impeller and Fig. 9 is asectional view taken on line 9-9, Fig.4 8.

The casing comprises a suction inlet section -1, a delivery. section 2- and any suitable. number of,' in this instance two,

. Specification of Letters Patent. Application at March 19, 1907. Serial No. 363.206.

intermediate sections' -3-'a'nd 4, all

Patented June 16, 1908.

.of which areclamped together end to end by suitable clampin bolts '5-' which connect the end sections 1 and -'2- beyond the periphery of the intermediate sections 3 and 4 thereby clamping said intermediate sections end to end to each other and between the end sections 1 and 2 Without passing the bolts through the intermediate sections. i

A suction inlet conduit constituting a part of the casing is secured by clamping bolts T to the .inlet side of the adjacent end section '-1 and is rovid'ed with a suction-inlet, 8- adapte to be connected to the source of water supply while the op osite end section 2 is provided with a de ivorypi e -9- which isusually formed integral with the delivery section 1 and tangential to its delivery conduit as best seen in Fig.

The inlet section 6- and delivery sec tion '2 are formed with central alined bearings -10 and- 1'1 respectively in which is journaled a suitable driving shaft- 12- adapted to be driven fromany available source of power, not necessary to herein illustrate or describe, said bearings being provided with wearing sleeves l3- inclosing the adjacent portions of the shaft and adapted to be readily removed when worn' and re placed by new ones and thereby avoiding the replacement of the case sections in which they are supported; The intermediate sec- v tions 3 and 4 divide the intervening space between the end sections 1 and --2 into a series of, in this instance three, impeller chambers and are provided with central alined openings -14 in which are iittedtubular wearing sleeves or bearings -1 5. for the central portion of the shaft 12 which carries a series of, in this in stance three, impellers, 16 '17 and 18 each revolving in one of the imneller chambers.

The portion of the shaft upon which the impellers are mounted is reduced in diameter forminga shoulder 20 against which the last impeller of the series abuts, said impellers being spaced apa rt by thesleeves 15 and are'held against endwisemovement between the shoulder '-20 and suitable lock nuts 21,whi'clr are secured upon the shaft 12 at the inlet side ofithe first im when: the spacing sleeves being .of suflicient ength to prevent undue 'lriction between the impellers and adjacentsides of the partitions 3." and l-. I

,Tllfi end thrust, due to the action of the imellers upon the water, is alwavs toward the inlet and I, therefore, provide an end thrust. bearing between the inlet end of the shaft and a suitable tnljusting screw 'saidbcaring being lubricated through .anoil passage '-L l leading'from an oil cup 25 in the top of the casing section 6.

' Water is drawn into the puinp through the suction inlet 8 and through a central -opening'26'- in the casiin ection -1 to the'first runner ---16-- which deliver-s it through suitable passages in the partition or case section to the second runn'er of the series, which inturinldehvers it to the next runner and soon through any number of runners, when-- it is'finally discharged from the last one'ofthe series into thedischarge con duitthepressure produced by each succ ire runneror impeller being increased 3 at thev pressure produced by the lastrumierfof the. series equals that produced by the runner mult n lied by the number of gunners. Q

"fl hevcollectivepressure 'produced by the runners tends to. excessive end thrust in the direction-ofthe sue-tit 1r inlet butwhich i have overcome by the hse of a specific form .ofim' "eller by which. the bressure at the front and ack ot eac-h impeller is substantially thes'ame as will be presently described.

Each of the intermediate case sections +3-..-{ and 4* are substantiall identical andpre-ferably consists of a pair of circular disks or .diaphragms 3()- and 31 dispnsedsideby side a sufficient distance apart to 'formintervening water passages -32-- arid are united by mtegral vanes -3 3- ditfidin'g the intervening water way into equal fitting annular tongues and grooves which serve not only to lock the sections against relative radial displacement but also affords more effective water-'tight joints. V

The impellers 1'6, +I7'-, and lS- are substantially identical in construction, each comprising a central-hub and. a pair of rings -35 of somewhat. greater diameter than the hub and connected thereto by vanes 36-- as best seen in Figs: 3, fiend 7, said The rings being spaced apart forming intervening delivery s ots or openings 3S of suitable size to obtain the desired capacity of delivery with a nnnn'num' friction.

"The rings --35 are of greater interior diameter than the exterior diameter of the.

hub of the impeller leaving the intervening space open from end to end or side to side,

the vanes -36 being formed integral with the hub and the rings.-35 serving to unite the outer ends of the vanes to give them the desired strength and are preferablyjfor'ined integral therewith.

In the smaller sizes of pumps the face width of theperiphery ofthe impellers orcombined face width of the rings 35 and intervening space 38. is substan tially equal to the width of the vanes -36- but in the larger sizes of pumps the outer faces of the sides of the rings as 40-, Figs. 8 and 9., are preferably cut away to reduce the weight although the width of the vanes remains the same to the periphery of the impeller. The hub of each runner is also provided with a series of apertures l3'-' extending theret-hrough from front to rear only reduces the weight of the impeller but also atl'ords additional means for balancing the water pressure at opposite sides of each runner which together with the openings between the hub and rings pracwhich not tically equalize the pressure at. both sides of the runner thereby counterbalancing the end thrust of the several runners and their supporting shaft.

It will be observed upon reference to-Fig. 3 that the contiguous faces of adjacent case sections are .formed with annularrecesses constituting a runner chamber and that the marginal edge ofthe first and next succeedingcase section over-hangs and surrou nls the next adjacent disk 3]. and forms therewith a water passage 50 connecting the inclosed impeller chamber with the water passage between the disks 30 and 31 which latter in' turn discharge through the central opening of the diaphragm -30 and into the opening of the adjacent impeller. It will be observed that. the disk --3l is disposed some distance wholly at one side of the adjacent face of the disk -3()- leaving a. clear -opening between the disks so that a suitable milling or cleaning tool may be inserted radially from the periphery through the passages and between the disks to smooth the sides of the water ways and to remove any obstructions which may interfere with the free passage of the water therethrough as it is well known that the efliciency of o eration of this class of pumps depends large y upon the smoothness of the sides of the water ways, Ano't-her important feature is that thesides and periphery of the plate or disk 3lmay be milled by ordinary tools and in fact all parts of both disks '30- and are easily accessible for truing up in a lathe or by other suitable instruments. Further more it will be observed thattheonly core required is that to vform the intervening spaces between the disks and between the vanes, which enables the device to be readily moldedinany ordinary sand mold.

As best seen in Fig. 5, the diaphragm or disk-30 is provided with an annular flange 60- projecting axially from the side opposite to that about'which the disk 31 is secured, a distance'greater than the axial width of said disk -3l forming a part of the case inclosingone of the impeller chambers and also surrounding" the diaphragm'or disk -31 of the next adjacent partition.

v The operation may be briefly described as follows: ater is drawn in through the inlet ''-8 centrally through the inlet 26. o the first case section '-1 into theflce'ntral opening of the first impeller from which it is discharged radially into the annular passage -'50 and is thenreturned toward the centerthrough passages 33 between the diaphragm 30 and 31 'ofthe next case section -3 being then delivered through the central opening in said intermediate case section '3 centrally in the second runner and so on through the next annular passage 50 around the periphery of the diaphragm 3l' of the intermediate sect on 4 and into thethird runner from which 'it is. discharged into the" delivery. conduit 9' 4 During this action of the water, the water pressure at opposite sides of each runner is substantially equalized by the free passage of the water throughthe open space between the rings 35 and hub of each i111 peller thereby counter-balancing the end said main body to permit cleaning and smoothing ol'the-sides of the water passages.

2. In a centrifugal pump, a case section comprising two disks of unequal diameters and spaced apart forming a waterway, the smaller disk and a considerable portion of the Waterway extending some distance beyond the adjacent side of the larger disk, and vanes uniting said disks.

3. In a multi-stage centrifugal pump, opposlte end and intermediate case sections and K external bolts clamping said sections together, the intermediate sections dividing the interior of the ease into impeller compart- "ments and each comprising two disks ot unequal diameters, the smaller disk of each intermediate section being spaced apart some distance from the adjacent end of its larger disk forming an intervening waterway, vanes uniting said disks across:thewaterway, impellers-1n the impeller chambers and connected. for serial operation, each impeller comprising a hubandvanes projecting there from, and rings connecting the extreme outer ends of the impeller vanes and spaced apart forming intervening water passages.

In witness whereof I have hereunto set my hand this 9th day of March 1907 CARL LAGER. l/Vitnesses: L

H. E. CHA E, MILDRED M. N OTT.

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