US2605713A - Centrifugal pumping means - Google Patents

Description

1952 H. E WARREN 2,605,713

CENTRIFUGAL PUMPING MEANS Original Filed April 15, 1943 INVENTOR MEMM ' A'1TORNEY Patented Aug. 5, 1952 "UNITED S P TENT OFFICE, Y

. 2,605,713 CENTRIFUGAL PUMPING ME V Henry-E. Warren, Ashl'andrMa'ss. "original application April 15,194aseria1 No, Q 483,162. Divided and this application Dec'em g bar '7, 1948, Serial No. 63,953 v p 1 Claim. (01. 103-103)- This invention relates to speed measuring centrifugal: pumps, more especially to such pumps adapted for use in a power, plant speed governor having an impeller-.valve-inertia-element combination, but is capable of use in other relations.

The primary object of 'my invention is the provision of a centrifugal impeller in which the head or hydraulic pressure produced is due substantially to the tangential speed component of the liquid which the impeller-moves, or tends to move, toward the piston end of the valve shaft, so that for any given impeller speed, the pressure of the oil on said piston is always the same, that is, it is invariable and is'independent of changes in the radial speed component of the motion of said liquid. I 1

When my new and. improved impeller forms a part of an impellerevalve-inertia-element combination, the necessity for employing antiracing connections between the governor and'servomotor is eliminated. r v p In the drawing accompanying andforming a part of this specification, the figure is a fragmentary central vertical section showing one embodiment of my improved speed measuring pump and the parts associated therewith; when said pump' forms. a .partof my impeller-valveinertiae-element combinationb In .theparticularv embodiment of my invention shown .in the..drawings, whichembodiment is to be considered as illustrative merely and not restrictive, the valve, shown generally at I, is returned to neutral position at about the same time the speed of the prime mover (not shown) is restored to normal without the use of antiracing connections. I The flywheel 2 is mounted for rotation about the valve rod 3 by the helical gearing 4, 5, and is disposed on, and for frictional movement with, the flange 6 fixedly secured to the hub I of the driven gear 5, ball bearings 8 preferably being interposed between said hub and said rod. Any suitable means (not shown) are provided for rotating said flywheel through pulley I and the impeller 9 at a speed proportional to that of the prime mover the speed of which is to be governed.

The impeller is mounted on the countershaft I0 journalled in the flange II, extending from the valve housing I2, and in the collar I3 secured to and passing upwardly from the impeller casing 14. Any suitable means, such as the pulley I5,

on the impeller shaft, and a belt (not shown) may be employed for connecting said shaft for rotation by the prime mover at a speed which,

of course, is proportional to that of the prime 2 mover. Speed reducing spur gearing 4', 5 rigidly connected to the impeller and valve rods, respectively, are employed'for rotating at relatively low speed the valve element 24' and piston It. The valve rod being relatively short, the piston 16 may be formed integral therewith and is disposed for rotary and axial movement in the cylinder [1 formed in the partition I8 between the reservoirs I9'and 20.. By means ofthe pipe 2!, said reservoir I9 is connected to the reservoir 22. While the impeller or centrifugal pump may have any suitable construction, I prefer to employ one comprising a disc having a plurality of radial holes '23 whereby the oil' in the reservoir I9 will be drawn throughthe pipe'2l to the lower reservoir 22 and thence upwardly andl'outwardly through said holes '23 .to the 'reservoirZEI for imparting to thelowerfaceof the piston I5 suitable hydraulicpressure'for the'purpose of varying the axial position of the valve element 24 and deter mining the position of the several annular ports 25' with respect to the several communicating sleeve ports 26. .The several pipes 21 afford communication between the valve and a source of fluid pressure (not shown), said valve'being interpose'd'between such source and aser'vomotor (not shown) 'forcont'rolling the-supply of fluid pressure to the latter. y -f While not absoluteliressential, better results .are obtained by the use of an impeller in which the head or hydraulic pressure produced is due substantially to the tangential speed component of the motion of the liquid so that for any given speed, such hydraulic pressure imparted to the piston is invariable. In the present instance, the upper portion 28 of the outer peripheral surface of the impeller abuts the inner periphery of the casing I4 and the lower portion of the outer periphery of the impeller terminates short thereof, thereby affording a space or passageway 29; in other words, the passageway between the periphery of the impeller and the inner surface of the casing is substantially at right angles to the axes of the holes 23 so that the hydraulic pressure developed by the impeller is due substantially to the tangential speed component of the liquid which the impeller tends to move into the lower reservoir 20 to impart hydraulic pressure to the piston It. To prevent rotation of the liquid in the reservoir 20, the central part or wall 30 of the lower surface of said reservoir 20 immediately below the impeller may project upwardly defining an annular member and the outer edge 3I of such projecting portion may terminate just short of the lower surface of the the acceleration measuring inertia element may be applied to existing systems in-which'ball or weighted governors, or like centrifugal devices, are used, to impart axial mdvementto a' valve interposed between a servomotor and a source of fluid pressure, said inertia element acting in conjunction with such centrifugally actuated weighted devices in substantially the same way in which it coactswith the impeller created force imposed uponthe piston connected with the valve, in the present instance. 1

It will be noted that the valve is freely mounted and is supported when in steady-state operation solely by the liquid with which the lower face of its attached piston I6 co-operates and the force due to said liquid in steady-state operation is opposed by a constant force equal thereto, 1. e., a force which does not increase or decrease with the movement'of the valve, with the result that there is no distance limitation in the movement of the valve and the piston thereto attached, so that such piston and valve will continuously rise or fall so long as there is a speeddifierential, from which follow certain advantages, for example, the acceleration forces acting on the valve will be directly proportionalto the acceleration which, of course, is not the case where the axial movement of the valve is controlled by a ball governor or the like. l

This application is a division of my application Ser. No. 483,162, filed April 15, 1943,'now.Patent No. 2,500,478, March 14, 1950.

Having thus described an illustrative embodiment of my invention, without, however, limiting the same thereto, what I claim and desire to secure by Letters Patent is:

A centrifugal pump including acasing defining a stator and containing 'a liquid, centrifugal means disposed in said casing for cooperation with the liquid to create hydraulic pressure, and a liquid container, the centrifugal means comprising a rotor having radial apertures therein, an inlet in said casing having communication through said rotor with said radial apertures, a peripheral surface on one side of said rotor having a diameter providing a running clearance with the inner periphery of the casing, 'a second peripheral surface on the'other side of the rotor having a diameter less than the diameter of the first peripheral surface whereby a narrow passageway is defined by the periphery of said second rotor surface and the inner periphery of the casing, a wall on the casing perpendicular to the inner; periphery of the casing spaced from and parallel to the end face of the rotor adjacent said other side thereof and coaxial therewith,

and an annular projection on said wall extending toward the said rotor of such dimensions as to be spaced from the end face of the other side of the rotor to afford arrunning clearance with the rotor and providing with the rotor a seal between the narrow passageway and the portion of the wall radially inward of the said annular projection, the outer circumferential surface of REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 557,300 Barber Mar. 81, 1896 885,108 Trent Apr. 21, 1908 1,717,969 Goodner June 18, 1929 1,729,458 Schwender Sept. 24, 1929 1,734,000 Spillmann Oct. 29, 1929 1,801,370; Schmidt Apr. 21, 1931

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