US2278595A - Pump - Google Patents

Description

.pril 7, 1942. l

F. E. STELZER lPUMP Original Filed Nov. 5. 195,5

JAMA/Mv A www Patented pr. '7, '1942 ICE entre Frank E. Stelzer, Lynbrock, N. Y.

Original application November 5, 1935, Serial No. Divided and this application April 24,

1939, Serial No. 269,723

(Cl. S-113) 1 Claim.

This invention relates to centrifugal pumps and more particularly to rotary pumps oi this type which are provided with means for rendering them self-priming.

The general object of the invention is to provide a novel and improved self-priminglrotary centrifugal pump of this general type which is of simple and compact construction and which is easy to build, install, and operate.

The present application is a division of my copending application Serial No. 48,411, filed November 5, 1935 which has matured as Patent No. 2,155,452 granted April 25, 1939.

In its preferred form, the invention contemplates the provision of a pump casing and a double rotor or impeller of the type described in the copending application to which reference has been made, one portion of the impeller being adapted to operate upon the main uid being raised or transmitted andthe other portion of the .impeller adapted to circulate a relatively statonary body of liquid which is permanently reserved within the casing for the purpose oi priming the pump or eliminating air or other gaseous fluid from the channels thereof.

Other objects and features of novelty will be apparent from the following specication when read in connection with the accompanying drawing, in which one embodiment of the invention is illustrated by way of example.

In. the drawing, the gure is a vertical crosssectional view through a pump embodying the principles of the present invention.

In the illustrated exemplary embodiment, the impeller is designated generally by the reference numeral l0. This impeller is mounted on the end of the shaft lcd and is provided with the radial passageways l2 which comprise the single fluid pump portion on the left-hand side of the impeller, as shown in the gure. These passageways may be purely radial, but are preferably curved and outwardly expanded circumferentially of the pump in a manner similar to the double fluid aspirating passageways shown in certain gures of the parent application. In general, the double impeller employed in the present arrangement is the same as that illustrated in Figure 6 of the application referred to, and reference may be had to the specification of that case for more detailed ldescriptions of the impeller. A cross-section oi the double huid portion of the impeller is shown in Figure 2 of that application.

The multiple uid suction pump side 80 ci the impeller is provided with the propelling or aspirating' fluid conduit 88 which leads to the.

short buckets 8l and the aspirated iiuid enters the annular passageway 90 through the holes 9| and is drawn through the outer buckets 8! and thence through the mixing portion of the impeller and'outwardly into the volute chamber cf the casing. 4

The casing of this pump is indicated generally by the reference 'character 20! and is preferably composed of the upper casting 202 and the lower casting 203, the latter being provided with the suitable base 204i. The main inlet conduit 205 of the pump is preferably of the shape indicated, the inlet opening being higher than the center intake passageways Il oi' the rotary pump section 12. y is provided with the outlet 200 through which the fluid is centrifugally ejected. A priming water compartment 2i0 is provided on the righthand side of the pump and this compartment is always filled with priming water to a level indicated by the line z-z. The compartment 2I0 is provided with an air vent 2 I2 which may serve I to exhaust entrapped air or gases to the atmosi phere, or may be connected to a suitable container in case these gases are to bel collected. The priming water in the chamber or compartment 2i-0 is, of course, free to pass into the central conduit of the right-handside of the impeller and is also in communication with the volute chamber 2 I4 ofthe right-hand pump section. The priming water chamber 2I0 and the volute impeller chamber 2id are both sealed oi! from lthe intermediate aspirated uid inlet chamber 255 by the sealing and bearing rings Zi and 2 llfltted to suitable seating surfaces on the casing and the impeller. This inlet chamber is connected by means of the pipev Zit with the inlet conduit 205, the mouth of the pipe being controlled by' the liquid operated-check valve 2i@ occupying the chamber 220 in the wall of the conduit 205 which connects with the interior of the-conduit by means of the narrow passage= way 22|. v

The operation of this apparatus as a selfpriming pump will now be described, a body of priming water being also retained to the level z-z by means of the elevated inlet conduit 205, even though leakage should occur around the clearances between the left-hand pump section l0 and the right-hand pump section 00. Thus theright-hand portion of the pump is always primed and the priming water, being circulated continuously from the compartment 2|0 through the rotor or impeller through the volute cham` Reissue) Jui 21nd' The main volute impeller chamber 201 ber 2li and back to the chamber 2|0, acts as an aspirating medium in drawing any air or gases which may be in the intake conduit 20E through the pipe 2li, the chamber 2li, the rotor of the pump Il and thence into the primlngwater compartment 2|! to escape through the opening 2I2. As the water level in the intake 2li vrises due to the creation of a vacuum above this water level, the left-hand side 1l of 'the pump will receive water, and the continued'rising of the ters Patent is:

A self-priming centrifugal pump comprising, in combination, a casing and a double integrally formed impeller member disposed therein and provided with a centrifugal liquid transfer impeller section and a double-bucketed aspirating section, an impeller chamber and discharge opening in said casing for said first named impeller section, an inlet conduit for liquid to be transferred by said ilrst named impeller section; an impeller chamber for said aspirating impeller section, an inlet chamber for iuid to be aspirated thereby, an inlet chamber for the aspirating me dium, a priming liquid reservoir, connections be tween said priming liquid reservoir and the discharge side of said impeller chamber of the aspirating section and the inlet chamber for the aspirating medium whereby the priming liquid may be recirculated during operation, a conduit connecting the upper portion of said liquid inlet conduit with the inlet chamber for the aspirated fluid in the suction pump, an enlargement in the inlet end of said conduit providing a valve chamber, a check valve body in said chamber adapted to be moved to close said conduit upon flow of liquid through said valve chamber but not moved to closed position by flow of air, said liquid actuated check valve being the sole means for controlling the ow of uid through said connecting conduit.

, FRANK E. STELZER.

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