US1839032A - Centrifugal pump - Google Patents

Description

Dec. 29, 1931. O JACOBSEN 1,839,032

' CENTRIFUGAL PUMP Filed Jan. 21. 1951 2 Sheets-Sheet 1 2 1 10 INVENTOR Dec. 29, 1931. o. JACOBSEN CENTRIFUGAL PUMP Filed Jan. 21, 1931' 2 SheetsSheet 2 Patented Dec. 29, 1931 UNITED STATES PATENT OFFICE OYSTEIN JACOBSEN, OF DAYTON, OHIO, ASSIGNOR TO THE DURIRON COMPANY, INC., A

CORPORATION OF NEW YORK CENTRIFUGAL PUMP Application filed January 21, 1931. Serial No. 510,102.

separator in the line of the return flow to the pump. One embodiment of the invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a plan view of the pump. Fig.

2 is a side elevation partly in section on the line II-II of Fig. 1. Fig. 3 is another plan view partly in section. And Fig. 4 is an end elevation partly in section on the line IV IV of Figs. 1 and 3 and with a part of the oasin broken away at the center of the pump.

5 Tteferring to the drawings, 1 and 2 are parts of the pump casing bolted together;

3 is the drive shaft provided at one end with the impeller or runner 4 and at the other end with the pulley 5; and. 6 is a suction elbow having at-its upper end a priming opening provided with a suitable cover 7. The elbow carries a strainer 8 of cup-shaped supported on suitable lugs 9 andremovable through the priming openlng when the cover is removed.

Leading horizontally from the upper periphery of the volute 10 is a-discharge outlet 11 leading into the separation chamber 12. The casing of this chamber is secured against the casing section 1 by means of the bolts 13, suitable gaskets being provided at 14 and 15. The chamber 12. is provided with a discharge outlet 16 located above the outlet 11 and preferably at ah angle of 90 degrees thereto. The chamber is provided with a removable cover 17 which permits of the insertion and removal of the cup shaped strainer 18, such strainer being supported on the lugs 19.

The lower end of the chamber 12 communicates with a priming conduit 20 which extends across the suction elbow 6 with its end 21 turned laterally in alignment with the axis of rotation of the runner and opposition to the eye 22 of the pump (Fig. 2) which is in the form of a short tube with inwardly taperin walls.

I lZVhen the pump is primed, the liquid lies at about the level A, filling the elbow and most of the volute. The pump is then started, and the action of the runner withdraws the liquid in the elbow and forces it through the horizontal outlet passage 11 into the chamber 12. It then flows by gravity through the conduit 20 and is discharged through the eye of the pump. This circulation carries with it some of the air in the elbow 6, and as this circulating action is continued, the air becomes exhausted from the elbow and the suction pipe connected thereto, causing the parts to fill with water. When this occurs, the chamber 12 is completely filled with water under pressure, so that a discharge occurs through the outlet 16. The screen 18 assists in protecting the pump from the continued circulation therethrough of any coarse material which may have gotten past the screen 8 in the suction elbow. The provision of the tapering inlet tube 22 at the eye of the pump increases the drag imposed on the water and air in the elbow 6 incident to the injection action of the liquid flowing through the end 21 of the priming conduit, and decreases the time required to free the suction elbow and its supply pipe from air. The use of the vertical separation chamber 12 with its removable cover ermits the use of the strainer 18, thus involvmg a substantial degree of protection from the circulation ofcoarse material and increases the life of the impeller and interior surface of the pump casing. The horizontal discharge. outlet with the vertical separation chamber at the side of the pump permits the use of a simpler form of construction and reduces the overhead required as compared with constructions having the separation chamber on top of the pump casing. Other advantages of the construction will be apparent to those skilled in the art.

What I claim is:

1. In combination in a centrifugal pump, a casing having an inlet eye at its center and a volute around its periphery, a discharge outlet extending horizontally'from the upper portion of the periphery of the volute, a vertical separation chamber into which the outlet discharges intermediate the ends of such chamber and itself having a discharge outlet located above the first discharge outlet, a runner or impeller mounted for rotation in the casing with its axis of rotation in line with the inlet eye, a suction elbow with an enlarged end cavity in opposition to and surrounding the inlet eye, and a priming conduit leading from the lower end of said separation chamber into saidelbow with its end turned laterally in alignment with the axis of rotation of the runner and in opposition to said eye.

2. In combination in a centrifugal pump, a casing having an inlet eye at its center and avolute around its periphery, a discharge outlet extending horizontally from the upper portion of the periphery of the volute, a'vertical elongated separation chamber into which discharge leads intermediate its ends and having a discharge located above the first discharge, a removable top for said chamber, acup-shaped screening! member seated removably in said chamber below said first inlet, a suction elbow with an enlarged end cavity in opposition to and surrounding the inlet eye, and a priming conduit leading from said separation chamber into said elbow with its end in alignment with the axis of rotation of the runner'and in opposition to said eye.

In testimony whereof, I have hereunto s'ubscribed my name this 19th day of J anuary,

O. J ACOBSEN.

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