US1458589A - Balancing means for pumps - Google Patents

Description

June 12, 1923.

N. A. MESSINGER BALANCING MEANS FOR PUMPS 1920 2 Sheets-Sheef 1 Original Filed July 10 June 12, 1923.

N. A. MESSINGER BALANCING MEANS FOR PUMPS 2 Sheets-Sheet Z 2!!! I IIII IIIII! Original Filed July 10 1920 enema dune t2, teas.

ans er NQBMAN A. MESSENGER, F EASTON, PENNSYLVANIA, ASSIGNOE TO PENNSYLVANIA PUMP AND COMPRESSOR 00., 0F EASTON, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

BALANGING MEANS FOR PUMPS.

Application filed July 10, 1920, Serial No. 395,239. Renewed April 4, 1922. Seriallto. 549,500.

To all whom it may concern:

Be it known that I, NORMAN A. MEssIN- can, a citizen of the United States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement in Balancing Means for Pumps, of which the following is a specification.

This invention relates to centrifugal to pumps and in particular to a pump in which the impeller is balanced, so that it will not be forced toward either end of the pump due to variation of pressure on either side of the impeller suction opening.

One of the objects of the present invention is to provide means to completely balance the pressure on either side of the impeller or impellers, the means provided being simple, eflicient and without moving parts.

Another object of the invention is to provide --balancing means contained wholly within the casm of the pum and not requiring the impe ler to .be per orated to permit fluid to pass through the impeller as has been the usual practice in single suction, single stage or multi-stage types of centrifugal pumps.

Another object of the invention is to provide the balancing means in the form of a passage or conduit contained within one of the casings, and extending from one side of the impeller to the other so that the fluid in the area directly opposite the suction inlet ma flow around the impeller to the suction or intake side of the, pump.

It is an important object of the present invention to provide the balancing conduit in one of the principal parts or halves of the pump easin so that there will be no break in the con uit at the joint between the upper and lower parts of the casing. Also it is an object to so form the conduit that it will be independent of the normal passages of the pump through which the fluid is forced between successive impellers, or between the suction and discharged passages so that the only flow of fluid through the balancing conduit is that necessary to provide proper balancing.

With the above and other objects in view, my invention consists in the features of construction and operation set forth in the following specification and illustrated in the accompanying drawings, forming a part hereof.

In .the accompanying drawings, 1 have shown one embodiment of the invention which I noW deem preferable, but it is to be understood that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

In the drawings- Fig. 1 shows a transverse section through one form of the invention.

Fig. 2 shows a plan view of a pump casing provided with the presentinvention.

Fig. 3-shows a section taken on line 3-3 of Fig. 2.

Fig. 4 shows a section taken on line 4-4 of Fig. 2.

Fig. 5 shows a longitudinal section of the pump shown in Figs. 2 and 3.

It is to be understood that the present showing and description disclose but one specific embodiment of the invention and that other forms and modifications are in.-

eluded within the spirit and scope of the invention as expressed in the appended claims. As illustrated in the above mentioned drawings, the embodiment of the invention selected for illustration in its entirety comprises the following rincipal parts: first, a pum casing; second an impeller therein; thir discharge passages extending through the casing and impeller or impellers; and fourth, a conduit within the casing and independent of the normal flow passages, connecting the area on opposite sides of the im eller.

rimarily my invention consists in a conduit extendin between and connecting the areas within t e impeller rings in the casing so that fluid may flow from one side to the other of the impeller to equalize the pressures pressing against the sides of the impeller or impellers within the area included within the impeller rings. One of these conduits is provided for each of the stages or sections of the pump when the pump has more than one stage. H

Referring more in detail to the drawings it will be seen that a casing for a single impeller of the double or balanced intake type has been provided. This type tends to balance the pressures on either side of the impeller, but, due to inequalities in the veloci- I The lower casing 50 is provided with both intake passages 53 and the discharge connection 52 connecting with the volute 52". Within these casings in a suitable central opening 54 the balanced impeller 16 is adapted to be rotatably mounted. This impeller 16 is fastened to central shaft 17 and is supported in suitable bearings on either side.

Passing through the intake passage 53 the fluid passes into the area 55 adjacent the centre of the casing on either side of the central transverse opening 54 in which the impeller rotates. The conduit 56 connects these two areas, the orifices of the conduit being shown at 57. This conduit provides a passage extending entirely within the lower halfcasing for the fluid to pass from one side to the other of the intake areas 55.

7 Normally there will be but little velocity of the fluid through this passage, only enough to equalize the pressures in either of the intake areas 55. I

The orifices are so placed for the conduits 56 that the normal intake velocity of the fluid entering the areas 55 does not enter the conduit 56, the main purpose of the conduit 56 being to provide a conduit independent of the velocity passages of the pump through which the fluid may circulate to equalize the static pressure on either side of the impellers. a

The described embodiment of the invention is but one of the forms which my invention may assume and it is to be understood that any form' of pump of single or multiple stage type may be provided with a balancing means within the spirit of the present invention.

What I claim is 1. A balancing means for centrifugal pumps comprising in combination, a pump casing, a double impeller having intake areas on opposite sides therein,- and a conduit formed within the parts of said casing ex tending from one side of the casing to the other and having orifices adjacent the intake areas on either side of said casing.

2. A balancing means for centrifugal pumps comprising in combination, a pump casing, a double impeller having intake areas on opposite sides therein, and a conduit formed within the parts of said casing independent of the normal flow passages and extending from one side of the casing to the other and having orifices adjacent the intake areas on either side of said casing.

3. A balancing means for centrifugal pumps comprising in combination, a pump casing, a double impeller having intake areas on opposite sides therein, flanges on said impeller, and a conduit formed within the parts of said casing extending from one side of the casing to the other having orifices adjacent the intake areas and adjacent the annular flanges of the impeller on either side of said casing.

In testimony whereof, I have hereunto set my hand.-

NORMAN A; MESSINGER.

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