US1353915A

US1353915A - Centrifugal-pump

Info

Publication number: US1353915A
Application number: US339531A
Authority: US
Inventors: Benjamin J Kime
Original assignee: RANSOM R MICKS
Current assignee: RANSOM R MICKS
Priority date: 1919-11-21
Filing date: 1919-11-21
Publication date: 1920-09-28
Anticipated expiration: 1937-09-28

Description

B. J. KIME.

CENTRIFUGAL PUMP. APPLICATION FILED NOV.21,19|9.

1,353,915. Patentedsapt. 28,1920.

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B. J. KIME.

CENTRIFUGAL PUMP.

APPLlcATloN FILED N0v.21.1919.

Patented Sept. 28, 1920.

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UNITED STATES I Alxrlazlar oFFicE.

BENJAMIN J'. KIME, 0F SENECA FALLS, NEW YORK, ASSIGNOR 0F ONE-FCURTH T0 RANSOM R. MICKS, 0F SENECA. FALLS, NEW YORK. I

cEN'iRIrUGAL-PUMP.

To` aZZwhom t may concern: v l Be it known that/I, BENJAMIN J. KIME,

of SenecaFalls, in the county of ySeneca,`

in the State of New York, have invented new and useful Improvements in Centrifugal Pumps, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description. This invention relates to certain improvements in centrifugal pumps and refers more particularly to means for automatically regulating the volume of liquid delivered by the'pump according to the head or degree of back pressure produced by the liquid.

The ordinary centrifugal pump is de- 'signed to discharge a certain' volume of liquid against a given pressure or head under-a predetermined speed of the impeller which requires 'a given motor powerto maintain the desired capacity \of delivery,

, but it is found that if .the head of the same pump is materially reduced it greatly increases the volume of discharge which, in turn, overloads the impeller and lrequires more power for its operation thanwunder the normal head for which the pump and its motive power were designed, so that if the head is materially/reduced the pump and itsmotive power will cease t0 properly function. 1

The main object of my invention is to provide simple and efficient means to automatically maintain approximately the same volume of delivery for a given period of time under varying heads or height of water column so that a pump designed for a certain head Imay be eiiiciently' operated Iunder reduced heads.

' In pumps of this character the intake opening in the impeller case is usually coaxial with the rotary impeller while' the outlet is tangential thereto so. that therotation of the vimpeller serves to `draw the liquid through the intake into the central opening in the impeller and to expelit through .passages lleading/'fromthe center to the periphery of the impeller 'into the outlet, and l `j-6- of the case.

lone of the specific objects of this invention is to provide an automatic piston valve be? degree lof lopen communication b etween the intake and impeller passages will be normally reduced to a comparatively small de' I Qgree, but is causedto gradually increase as Specification of Letters Patent.

rotatable in the ease-1 and Patented Sept. 28, 1920.

Application led November 21,' 1919. Serial No. 339,531.

means'of a coaxially slidable piston valve y having a piston head communicatingfwith the outlet through the impeller chamber and itsinner end extended into the impeller across the adjacent' ends of the passages therein and provided with radial openings registering more or less with said passages under varying pressures as the valve is operated by liquid pressure in one direction against the action of a suitable retracting spring hereinafter described.

Other objects and uses relating to specific parts of the pump will be brought out in the following description.

In the drawings Figure 1 is a longitudinal vertical sectional view of a centrifugal pump embodying the vfeatures of my invention.

Fig. 2 is an enlarged transverse vertical sectional View of the same pump taken on line 2-2, Fig. 1.

Fig. 3 'is an enlarged longitudinal sectional view of the detached impeller and piston valve.

As illustrated, the centrifugal pump coml prises a base -1- having lengthwise jour-v and also having a circumferentially extending ozutlet -`6- terminating tangentially at An impeller -8'- is secured to a" rotary shaft -9- which is journaled inthe bearings -2- and-3 3 said impeller being A rovided witha central opening l0-,- an aseries ofpassages ,-11'-, said opening -10- vbeing coaxial with `the inlet -5- of the case while .the passages --Vlllead from the central opening in the impeller to the outlet A tubular valve T12` is mounted coaxiallyl of andwithin the opening -10- in the impeller /to slidef endwise or axially across the inner ends of the passages l1- and i-s provided with an annular shoulder L--13-- coperating with a portion +14- of.l the impeller for limiting .the closing` iol movement of the valve toa partially open position 'and thereby maintaining a restricted communication between the interlor of the valve and outlet passages -11- until the fluid pressure is sufficient to overcome the tension of its retracting spring.

To this end the tubular valve l2- is provided with av series of radial passages *15- normally 4 extending in opposite directions from and beyond the stop shoulders --13` and 14- so that the eifective size of the opening between the interior of the valve and passages 1lmay be enlarged by theinward lmovement of the valve from its normal position.

This opening movement of the. valve is produced automatically by the pressure of the fluid expelled by the impeller into ,the outlet -6-, said pressure being variable inversely as the head or height of the column, of liquid from the terminal end 7- of the outlet.

For this purpose is provided a tubular preferably formed integral with the tubular valve l2- coaxial with the inlet -5- of the case so that the valve and piston together constitute a tubular sleeve which is slidable endwise or axially within the opening l0- and an additional guide opening 1T- in the case, the interior of said sleeve communicating with the inlet -5- of the case.

The piston 16- is `formed by an enlarged central portion of the sleeve of which its supporting shaft designed, it

it forms a part and is located in the impeller chamber -18` between the outer end of the impeller and the adjacent side of the case where it is exposed to the pressure of the liquid from the outlet 6` through the impeller' chamber.

' A retracting spring 19- is located within the sleeve, as -20-, forming the valve 12- and the piston -16- and has voneend bearing against the inner wall of the impeller and its other end engaged with van inturned annular shoulder 21- on the outer end of the sleeve for retracting saidsleeve and thereby normally holding its shoulder *13*- in engagement with the companion shoulder -14- or, in other words, normally maintaining the valve in a partly open position.

It is now evident that as the impeller and -9- are rotated by any suitable means unnecessary to herein illustrate, the liquid will be drawn into the central inlet 5* and thence through the sleeve 20- from which it will pass through the openings -l5- and passages -llof the impeller and thence through the outlet passage (not sho-wn) rising from the terminal end -7- of the outlet -6-. N ow, if the pump is operating under normal hea-d and power for which it was will continue to deliver the re- .tensioned relatively quired volume of liquid, but should the head be reduced for any reason tending to increase the volume of delivery, the decreased pressure of such liquid upon the piston -16- will allow the latter to be moved axially toward its normal position by the spring 1Q-'for maintaining approximately the same volume of delivery as that for which the pump was designed under the maximum head.

It is to be understood that pumps of this character are designed to operate under an approximately predetermined head and volume of delivery, and that in many instances the pump is installed to operate under a considerably lower head than that for which it was designed, resulting in a corresponding reduction of back pressure and a proportionately increased volume of delivery unless some means is provided'for preventing such increased volume of delivery.

The valve *l2- and its retracting spring -19- are normally adjusted to allow the passage of water therethrough at the beginning of the operation of the pump and until the head reaches a predetermined (relatively low) level, whereupon as the head and consequent back pressure increases, the valve will be further gradually opened against the action of its retracting spring 19- and may continue to further'open until the maximum head and volume of delivery for which the pump is designedis reached, at'which time, the capacity of delivery will, of course, be practically constant.

In the event, for any reason, the pump should be used with ahead considerably less than that for which it was designed, the back pressure will, of course, be correspondingly reduced and will allow a corresponding -return of the 4valve 12- toward its normal' position by the spring -19, the tension of the spring tending to move the valve toward its normal position being so to the maximum head l pressure tending to open the valve against the action of the spring, that when the pump is used with a head materially below that for which it was intended, the gradual movement of the valve toward its normal 1 position by the spring under the reduced pressure will automatically maintain approximately the same volume of delivery as when operated under the maximum head with the valve full open.

On the other hand, if the passage for the water to the impeller were to remain at its full capacity and the head were materially reduced, the volumeof delivery would be corres ondingly increased beyond the voll having an `inlet and passages communicat- 12 ing respectively with the first-named 'inlet and outlet, a valve controlling communication between the inlet and passages of the impeller and normally having restricted communication with said passages, a piston actuated in one direction by pressure of the 'fluid discharged by the impeller and connected to the valve for gradually` opening the latter as the liquid pressure increases beyond a certain degree, and retracting means for the valve and piston.

2. In ,a centrifugal pump the combination y of an impeller case having an inlet and an outlet, a rotary impeller in said case having an inlet and passages communicating respectively With the inlet and outlet of the case, f

a valve movable across the inner ends of said passages, means'actuated by pressure of the liquid discharged by the impeller for gradually opening the valve as the pressure increases, and retracting means for said valve and piston.

3. In a centrifugal pump the combination of an impeller case having an inlet and an outlet, an impeller rotatable in said case and provided Wit-l1 an inlet and passages registering respectively with the inlet and outlet of the case, said inlets being coaxial with the axis of movement of the impeller, a tubular valve coaxial with said inlets and movable axially across said passages, a piston actuated in one direction by pressure of the expelled fluid, and transmitting its motion to said valve for opening the latter as the pressure increases, and retracting means for the valve and piston.

4. In a centrifugal pump the combination 'of' an impeller case having an inlet and an outlet, an impeller rotatable in said case and provided with a. central opening coaxial with the inlet of the case and also having passages communicating with the outlet of said case, a valve movable in the central opening of the impeller across said passages and provided With an inlet communicating with that of the case, coperative means between the impeller and valve Jfor limiting the closing movement of said valve to a partly open position, a spring normally holding the valve in its partially closed position, and means actuated by pressure of the expelled iuid for gradually opening said valve against the action of said spring When the pressure is suiicient to overcome the tension of the spring.

In witness whereof l have hereunto set my hand this 10thvday of November, 1919.

BENJAMIN J. KME.

Witnesses:

H. E. CHASE, MARGARET L. S'roUP.