US1065731A - Centrifugal force-pump. - Google Patents

Description

J. SGHNEIBLE.

OENTBIFUGAL FORCE PUMP.

APPLIOATION FILED MAY 31, 1912.

Patented June 24, 1913..

J. SGHNEIBL'E.

'OENTRIFUGAL FORGE PUMP.

APPLICATION FILED MAY 31, 1912,

1,065,731. Patented June 24,1913.

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JOSEPH SCHNEIBLE, OF CHICAGO, ILLINOIS.

GENTRIFUGAL FORGE-PUMP.

To all whom it may concern:

Be it known that I, JOSEPH SOHNEIBLE, a citizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented a new and useful Improvement in Centrifugal Force-Pumps,

of which the following is a specification.

My invention relates to an improvement in the centrifugal type of pumps; and its primary object is to provide a construction which shall increase the effective range of capacity and heads of centrifugal pumps while operating under varying conditions of quantity and pressure, thus adapting the pump to deliver a given quantity of fluid against extraordinarily-high counter-pressure with the minimum consumption of power.

In the accompanying drawings, Figure 1 shows my improved pump by a view in sectional elevation, the section being taken on line 1, Fig. 3; Fig. 2 is an enlarged broken detail view of the port-forming ends of two inner wall-sections; Fig. 3 is a sect-ion on line 3, Fig. 1, showing an impeller-blade tip in section, and Fig. 4 is a view similar to Fig. 3, but showing a port reducing-ring adjunct.

Like other pumps of this type, the present pump comprises, in its general construe-- tion, a casing. 5 having an inner annular wall 6 containing ports 7 at intervals and forming in the casing an outer deliverychamber 8 leading'to a discharge-nozzle 9, and an inner pumping-chamber 10 having a central inlet 11 (shown dotted in Fig. 1)

in one side of the casing, and arotary impeller 12 on a shaft'13 journaled centrally in the opposite side of the casing for driving the impeller t0 revolve the fluid within the pumping-chamber.

The present improvement lies, primarily, in the relation to be observed, for accomplishing the aforesaid object, of the inner lines of the circumferential wall to the lines of the walls of the discharge-ports 7, formed in said wall, and the impeller-axis; and it is, furthermore, important to observe a certain height of the discharge-ports leading tangentally from the pumping-chamber into the delivery-chamber, as also a particular curve of that part of the impeller-blade tip 14 which revolves in the absolute path of the fluid being pumped, meaning Specification of Letters Patent.

Patented June 24, 1913.

Application filed May 31, 1912. Serial No. 700,640.

the path which is formed by the quantity of fluid discharged through each port by the action of animpeller-blade in each revolution of the impeller. To that end, the annular wall 6 is composed of a plurality of equal sections, .15, 16 and 17, of which three are shown, though there may be more or fewer. Each section is formed with a shearing edge 18. at one end, these ends being all equidistant from the true center of the inner pumping-chamber, so that they would be on a circle, indicated at o, struck from that center. From this shearing edge to a point :12 toward the opposite end of each wall-section, its inner-surface describes an arc of a circle eccentric to the aforesaid center. Thus, that extent of the inner surface of the section 15 describes an arc of a circle having the point 15 as its center, and the corresponding extents of the inner surfaces of the sections 16 and 17 describe arcs of similar circles having, respectively, the points 16 and 1-7 as their centers.

Each discharge-port 7 is formed between adjacent overlapping ends of successive wall-sections by extending the inner surface of each from the point a; as atangent, and preferably as a true tangent, to the respective arc to form the outer or upper portwall 19, and the opposite port-wall 20 forms a throat at 21 and extends therefrom outwardly, to expand the port, on a line forming with the line of the Wall 19 the sides of an angle divergingsubstantially at 5 degrees. In other words, the discharge-ports, from the throat outwardly widen on an angle of substantially 5 degrees until the velocity of the fluid is suitably reduced, according to the physical condition of different fluids to be pumped; the height and width of each discharge-port at the throat 21 being such as to permit, when shown. The inlet-end of each port is shown mobile fluids.

to be widened inwardly from the throat 21 to form an entrance-chamber between the shearing-edge and threat for the purpose of accumulating the fluid at the throat and thereby increasing the velocity of its passage through the latter for augmenting, by such increased velocity, the pressure in the discharge chamber. Observance of the angle of substantially 5 on the port-inlet and impeller-tip affords the advantage of causing each tip, in passing the inlet-end of a port (which is of the venturi type) to cdoperate therewithv to exert, as it were, a compressionaction against the revolving fluid being sheared ofl, thereby making it possible to discharge the latter through the ports at a pressure greater than that accepted in the art as the maximum discharging pressure. By observance of that angle in the discharge-port, the velocity at which the fluid leaves the port is converted into pressure without pulsation or back action, which would cause shock within the pumping chamber.

In the present construction, the sections of the wall 6 present an inner circular wallsurface of the diameter of a circle described from the true center of. the pumping-chamber on the shearing-points 18 plus substantially the discharge-port height; the tip of an impeller-blade, in passing from port to port along the arcs forming the inner wallsurface, does not recede from the latter farther than a distance equal to' or approximating the height of the ports, and such recession proceeds gradually and uniformly from shearing-edge to shearing-edge.

The number of the ports, and therefore of the wall-sections forming them, is determined by the physical condition of the fluid, fewer being required for the more viscous and a larger number for the more In the same way, the number of impeller-blades or tips is determined by the physical condition of the fluid to be pumped; and in the case of a compressible fluid, these tips may be as close together as practicable without impeding the radial outward movement of the fluid through the ports. The height of the ports at the throat determines the absolute discharge-path of the fluid capable of being discharged through each port and at substantially the rim-velocity at which the fluid issues from the impeller, so that each port, when the pump is operating at its greatest capacity, discharges, at substantially rim-velocity, a stream of fluid sheared, as it were, from the rim of the revolving body of fluid at that point, and of the height and width of the port duly allowing for slippage, particularly when the pump is operating at high efiiciency. With the impeller-tips, in the present construction, revolving in close prox- Loeegirat imit-y to the shearing-edges 18 of the ports, 7

the slippage at these points is reduced to the minimum.

When it is'desired, as it sometimes is, to reduce in the present construction of pump the quantity of fluid discharged under given conditions, this may be accomplished by reducing the width of the ports 7 through the medium of a reducing-ring 22, shown in Fig. 4, instead of providing an entirely new pump with its ports of the desired width. This ring, of proper thickness, is secured, as by countersunk screws 23, at intervals, to the inner face of a head 24 of the casing, toward which it tapers, as shown at 25, from its junction with the wall 6. To accommodate .the thickness of the ring the sections of the wall 6 are cut away at their sides againstwhich the ring is fitted to the extent of the width of the latter, and the impeller-blades are cut away on an angle, as indicated at 25, to correspond to the taper 25.

I realize that considerable variation is possible in the details of construction thus specifically shown and described, and l do not intend by illustrating a single specific, or preferred form to limit my invention thereto; my intention being in the following claims to claim protection upon all the novelty there may be in the device as broadly as the state of the art will warrant.

What I claim as new and desire to secure by Letters Patent is- 1. A centrifugal pump having in its casing an annular wall forming the inner pumping-chamber and outer delivery-chamber, said wall being in sections overlapping each other at their ends and forming ports with shearing-edges at corresponding ends of the sections on a circle having as its cen ter that of the pumping-chamber, throats and entrance-chambers thereto expanding inwardly from the throats, the inner surface of each wall section extending from the shearing-edge end thereof as an arc of a circle eccentric to said first-named circle, and from the opposite end of the are substantially at a tangent thereto and forming the outer port-wall.

2. A centrifugal pump having in its casing an annular wall forming the inner pumping-chamber and outer delivery-chamher, said wall being in sections overlapping each other at their ends and forming ports with shearing edges at corresponding ends of the sections on a circle having as its center that of the pumping-chamber, throats and entrance-chambers thereto expanding inwardly from the throats, the inner surface of each wall-section extending from the shearing-edge end thereof as an arc of a circle to the outer port-wall, said port-wall extending substantially at a tangent to said are, and the diameter of said last-named circle being that of the circle having said center plus substantially the discharge-port height.

3. In a centrifugal pump having a casing provided with an inner annular Wall containing ports at intervals and forming the inner pumping-chamber and outer deliverychamber, and a rotary bladed impeller in the pumping-chamber, a port-Width reduc-- ing-ring interposed between a side of the 10 impeller and annular Wall and the adjacent casing-head.

' JOSEPH SCHNEIBLE. In presence of D. C. THORSEN, O. C. AvIsUs.

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