US1460160A - Pump - Google Patents

Description

H. E. LA BOUR PUMP Fild March Patented June 26, 1923.

UNITED STATES PATENT OFFICE.

HARRY E. LA BOUR, OF CHICAGO, ILLINOIS.

citizen of the United States, residin PUMP.

Appligation filed when 7, 1921.

To all whom it may concern Be it known that I, HARRY E. LA Boon, a at Chicago, in the county of Cook" and tate of Illinois, have invented a certain new anduseful Improvement in Pumps, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to pumps, more particularly to centrifugal pumps.

In centrifugal pumpsit is desirable to have a pump which does not become air bound, and it is furthermore desirable to have as little end thrust on the shaft of the pump as possible.

A further desideratum is high efliciency and the ability to deliver a relatively high pressure.

My. invention accomplishes the above desired functions in a simple and eflective manner, and in addition I have found that the pump, so long as it has a li uid seal, is able to exert suflicient suction w en running with air in the pump casing to raise .water a height of five or six feet.

Further and more specific advantages of my invention will be-advanced from the following detailed description.

In the accompanying drawings, which illustrate an embodiment of my invention:

Figure 1 is a vertical cross sectional view of a pump embodying my invention Figure 2 is an elevational front view of the runner and rear plate, with the front plate removed;

igure 3 is a side elevational view of a pump and motor on a common base; and,

Figure 4 is a fragmentary sectional view of a modification.

The pump of my invention is free of end thrust on the shaft 1, and consequently no end thrust bearing is necessary, the pump shaft 1 being connected directly to the motor shaft, and the pump and motor being mounted upon a common base, in line with each other.

. The pump 3 isma'Jde up'as shown in Figures 1 and 2, of two parts, namely, a front late 5, and a back plate 6, in which is housed the runner 7. I

The casing formed of these two parts 7 provides an outlet 8 at the upper end, sur- Serial No. 450,849.

flange is adapted to be connected to a delivery pipe for the pump.

The two parts of the casing 5 and 6 have flanges 10 and 11 for bolting together the two parts of the casing in a well known manner. The rear plate 6 provides the packing gland 13, which may be of any preferred or suitable character. At the lower portion of the plate 6 a foot member 14 is provided for mounting the pump, this foot member being in the form of a plate disposed at right angles to the main portion of the plate 6, and being connected by a reenforcing web 15, which is disposed on the back side of the back plate 6. In a similar manner, aflange 16 hes above the stufling box 13, and connects the stufling box with the back plate 6.

The front plate is provided with an inlet opening 17 having a bolting flange 18 about the same, for attachment to a suitable intake pipe.

Between the plates 5 and 6 I provide a cylindrical peripheral space 20 communicating with the outlet 8 through a flared discharge passage 21, which is most clearly illustrated in Figure 2 The eripheral space 20 provides a runway for t e ends of the blades of the impeller 7, this impeller having. as shown in the present case, four arms, the ends of which approach relatively close to the cylindrical surface of the space 20, roviding only sufficient clearance to avoid rubbing against the cylindrical wall. This permits of a maximum length of impeller in a given size of pump casing. The

flaring passageway 21 opens into the space I I Between the intake opening 17 and the peripheral space 20, I provide a conical pocket or intake passa eway 23, which permits the liquid to attain a substantially radial direction before engaging the arms of i the impellers 7. This conical space 23 is not occupied by any part of the impeller, hence the incoming liquid is free to distribute itself freely through this space, and to lower its speed as compared with its speed on entering the openin 17. In the conical. space 23 it is possib e to dispose a screen, as indicated at 27' in dotted lines in Figure, 1. This screen may be cast integral with the plate 5. The increased area pro ided by the diver ing intake passageway 3 makes it possib e to dispose the screen therein without restricting the flow.

There is no end thrust on the shaft 1, the incoming liquid apparently taking a radial course before it strikes the impeller. The

; impeller is provided with blades of the s'ame width throughout their length, although I any pump with which assume that this feature is not absolutely essential. However, the ends of the impeller arms 22 are substantially flat and straight, and fit fairly close to the side fi walls of the casings 5 and 6 where the space 20 is defined. In order to'assist the dividing of the fluid radially, I provide in a'modified form the directing cone 25, as shown in Fig ure 4, for leading the liquid radially to the ends of the impeller blade. This cone is supported by a number of arms 26, which may be cast integral with the cone 25 andpumpingpccursmainly at the-upper half of H the adjacent part of the casing 5.

. I am unable to explain accurately the precise action which occurs inside the pump, but I am able to state; as a result of a number of ei rperiments that the ously constructed or found on the market. I find that the efliciencly is higher than in am familiar. The pressure head which I am able toobtain with a given expenditure of power and a given rate of flow in a given size of pump, is igher with the resent pump than any' with which I am amiliar. The pump does not become air bound upon the entry of air I into the pump casing, and, as I have previously indicated, the pump will exert a suc tion even with air entering the casing.

What I assume from my experiments that occurs is the following: Liquid enters the opening 17 and spreads out throughout the conical space 23, assuming a relatively lowerward by centrifugal gravity,'is then thrown out at the flaring discharge passageway 21 by the centrifugal force which it' has attained through the motion of the im' ller arms and moves out through the disc arge opening 8. At the same time, the incoming liquid tends to refill the pocket, and perhaps a portion of the incoming liquid tends to follow the discharge liquid out through the discharge passageway 21 bein drawn outward by the velocity of the. ischarged or impelled liquid to carry with it a portion of theliquid directly from the intake passagewa 23. The pocket is again filled or partia ly filled with liquid taken from the intake passageway 23, so that the real action of the pump. l

I am unable to sa whether what I assume to occur does actua ly happen or not. 7

f I do not intend to be limited to the preicise details shown and described.

, present! form of pump gives me greater efliciency than any form which I have previ- I claim: A centrifugal pump having, in combination, ri id blades defining a whirlin space bounded by parallel plane-s, an axia inlet and a radial outlet opening directly into said space, said outlet having sides flaring into tangency with said space and subtendm an arc of the periphery substantially equa to the are between the tips of adjacent blades.

In witness whereof, I hereunto subscribe my name this 5th day of March, 1921.

- HARRY E. LA BOUB.

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