US971852A - Centrifugal pump. - Google Patents

Description

ILED DEC. 6 1905 w in 3|: WIFQ w H m mm .N J x N \x MP III a: x

erases.

TES PATENT Enron.

CENTRIF'UGAL PUMP.

To all whom it may concern:

Be it known that I, FERDINAND W. KRoeH, a citizen of the United States, residing in the city and county of San Francisco and State of California, have invented certain new and useful Improvements in Centrifugal Pumps, of which the following is a specification.

The object of my invention is to relieve the impelling wheel of a centrifugal pump from friction by making it float in the liquid passing through the pump.

In carryin out my invention I provide the pump cas ng with a. cylindrical chamber opposite the suction opening, and I provide the impelling wheel with a piston or plunger, located centrally, like a hub, which plays in this chamber; I also provide two passages connecting this chamber respectively with the suction and discharge of the pump, through which liquid is withdrawn from, or supplied to the chamber. These passages open into the chamber in such way that their openings are controlled by the plunger, one being open when the other is closed.

In the accompanying drawings I have shown a horizontal pump containing my invention in its best form.

The figure shows the pump in sectional elevation.

In the figure :1 is the casing of the pump, and 2 the impeller wheel rotating therein, and mounted on the shaft 8.

4 is the suction opening of the casing, and 5 is the discharge.

6-is a cylindrical well or chamber, opposite the suction opening a. This chamber or well has inlet and outlet ports 6" and 6, herein designated as pressure and suction ports, respectively, as they are connected with means through which the chamber or well is supplied with liquid under pressure and with means for suctionally withdrawing said liquid.

7 is the piston or plunger on the wheel, fitting and playing in the chamber and adapted to close the ports 6 and 6 alternately by predetermined variations in the position of the impeller wheel from its condition of balance. It is preferably hollow, as shown, and open interiorly to the chamber or well.

8 is a pipe connecting the chamber with the suction 4 of the pump, and 9 is a similar pipe cmmecting the chamber with the dis- Specification of Letters Patent.

Application filed December 6, 1905.

Patented Get. 4, 1910.

Serial No. 290,619.-

charge 5 of the pump. These pipes are controlled respectively by valves 10 and 11.

12 is a groove in the outer surface of plunger 7, in such a position that it comes opposite the mouth of pipe 9 when the wheel is in its lower position in the casing, as indicated by the dotted line, at which time the mouth of pipe 8 is covered and closed by the plunger. The groove 12 communicates with the interior of the chamber by means of holes 18 pierced at intervals, as shown.

In operation, if the wheel is at the'upper part of its casing, in the position shown, the pipe 9 is closed, or nearly so, by the plunger, and the pipe 8 is open. Hence liquid is withdrawn from chamber 6 by the natural suction of the pump operating through the suction opening 4, and the wheel is drawn downward. But if the wheel is in its lower position, indicated by the dotted line in the lower part of the chamber the pipe 8 is closed by the plunger, and the pipe 9 communicates with the chamber through the groove 12, and liquid is forced into the chamber from the pump discharge through the pipe 9, and the impeller wheel 2 is pushed upward. These two effects alternate until, at some intermediate point, an equilibrium is established, and the wheel floats in the liquid passing through the pump.

Particular attention is called to the fact that I have provided a most simple and effective means for the purpose in view. Thus the pressure chamber 6 is arranged at the side of the casing opposite the suction portion of the pump, or in other words, at the side of the impeller remote from the pumpsuction, and the plunger 7 is at the closed side of the impeller and is formed partly by an element of said closed side, and partly by a ported wall which moves with the impeller and in said chamber, and controls the pressure admitted into the space encircled by said wall, through the ports from the pressure and suction portions of the pump.

I claim 1. A self balancing centrifugal pump comprising a casing having a suction inlet and a pressure outlet, a ported pressure chamber, pipes respectively connecting the ports of the chamber with the inlet and outlet, and an impeller wheel arranged within the easing directly above the chamber and provided with a depending hollow plunger adapted in one position to close the port of the chamher connecting the inlet said plunger being 1 provided with a passage which is adapted, in another position of the plunger, to communicate directly between the other port of the chamber and the interior of the plunger.

2. A self balancing centrifugal pump comprising a casing having a suction chamber, pipes respectively connecting the ports of the chamber, with the inlet and outlet, and an impeller wheel arranged within the casing directly above the chamber and provided with a depending hollow plunger adapted, in one position, to close the port of the chamber connecting the inlet, said plunger being provided with an exterior circumferential groove and spaced ports, which are adapted, in another position of the plunger. to communicate directly between the other port of the chamber and the interior of the plunger.

In testimony whereof I have afiixed my signature in presence of subscribing witnesses this 20th day of November 1905.

FERDINAND W. KROGH.

Witnesses TM. S. BATES, A. S. FARE.

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