US2472412A - Impeller for centrifugal force pumps - Google Patents

Description

June 7, 1949. w. B. FRITZ IMPELLER FOR CENTRIFUGAL FORCE PUMPS Filed March 14, 1947 FIG. 1.

FIG. 2.

WALTER Patented June 7, 1949 .IMPELLER roa CENTRIFUGAL roncn PUMPS Walter B. Fritz, Monroeville, Ohio Application March 14, 1947, Serial No. 734,625 2 Claims. (01. 103-415) This invention relates to an impeller for centrifugal force pumps.

In the prior art constructions, impellers have usually been made in the form of a central hub with vanes, usually curved vanes, attached thereto. The attachment of the vanes to the hub involves dimcult machining and assembling operations, and, in order to secure approximately perfect dynamic balance, a counter-balancing operation. Moreover, since these impellers run at high velocities, there are strong kinetic forces tending to pull the blades loose from the hub, and if this happens, the machine is wrecked. Moreover, curved vanes are subject to centrifugal forces tending to fiexure toward straight line formation. In order to obviate these difficulties, the'impeller of the present invention was developed.

The object of the present invention is to provide an eflicient impeller for centrifugal force pumps.

It is another object of the present invention to provide an impeller formed from a minimum number of parts.

It is an additional object of the present invention to provide an impeller which will be in perfect dynamic balance as machined and requires no counterbalance.

It is a further object of the present invention to provide an impeller in which the principal working part is of one-piece construction.

It is a still further object of the present invention to provide an impeller which has no vanes and is, therefore, devoid of the difliculties that beset vane designs.

Still other objects, advantages and improvements will become apparent from the following specification, taken in connection with the accompanying drawings, in which:

Figure 1 is an isometric view of the impeller of the present invention;

Figure 2 is an elevation view of the front face of the impeller; and

Figure 3 is a vertical sectional view through the impeller.

Referring now to the drawings, and to Figure 3, in'particular, the impeller is here shown as comprised of a solid right circular cylinder I having a plurality of radially-spaced bores 2 exa centrally-disposed opening l0 extending through said cylinder. A shaft 6 mounts the right circular cylinder I, said shaft having a, reduced end 8 which extends through said central opening I0 in the cylinder in a force fit, the reduced end-8 forming with the body of the shaft a shoulder I against which the rear face of the cylinder is seated. A pin 9 secures the cylinder I to the shaft 6, said pin being secured by a force fit in the aligned holes formed concentrically in the bottom one bore 2, the reduced end 8, and the bottom of the diametrically-opposite bore 2.

On its front face the cylinder I is provided With :a circular recess 5 concentrically disposed with respect to its central opening I 0. Positioned within the confines of the circular recess 5 and in communication with the radial bores 2 are a plurality of spaced holes 3 extending axially from the front face of the cylinder to the respective bores. The holes are chamfered at 4 around their outer edges to facilitate admission of the liquid and reduce eddy whirl. The recess 5 provides for the ready ingress of liquid to the holes 3 and bores 2.

The operation of the impeller of the present invention should be readily apparent from the preceding description. The impeller fits in a generally circular casing (not shown) with close clearance all around. The liquid enters the easing axially of the latter onto the impeller and passes into the recess 5 in the front face of the impeller disc I and then into the holes 3 and out through the radial bores 2. The liquid is thrown outwardly by centrifugal force and leaves the impeller casing through a tangential outlet therein.

Having now described my invention, what I claim as new and useful and desire to secure by Letters Patent of the United States is:

1. An impeller for a centrifugal force pump comprising a solid, right circular cylinder, there being a centrally-disposed opening extending through said cylinder, a plurality of radial bores in said cylinder and spaced from each other,

the front face of said cylinder being provided with a circular recess concentrically disposed with respect to said opening, and a plurality of holes positioned within the confines of said circular v n i to pp m t y a point contiguous t recess and in communication with said radial 3 bores, said holes extending axially from the trout face of the cylinder to the respective bores.

2. An impeller for a centrifugal force pump comprising a solid right circular cylinder, there being a centrally-disposed opening extending through said cylinder, a plurality of radial bores 4 shaft extending through said opening and fix- I edly secured to said cylinder.

WALIER B. FRITZ.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 1 Number Name Date 1,865,918 Junkers July 5, 1932 1,873,974 Meyer Aug. 30, 1932 1,919,970 Woods July 25, 1933

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