Untitled record

W. D. ANDREWS.

BOTAEYPUMP.

No. 11,544. Patented Aug. 22, 1854.

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'Wilneratt:

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UNITED STATES PATENT OFFICE.

WILLIAM D. ANDREWS, OF NEW YORK. N. Y.

CENTRIFUGAL PUMP.

Specification of Letters Patent No. 11,544, dated August 22, 1854.

To all whom it may concern:

Be it known that I, William D. Andrews, of the city, county,, and State of New York, have invented a new and Improved Centrif5 ugal Pump; and I do hereby declare that the following is a full, clear,.,and exact description of the same,, reference being had to the annexed drawings, making part of this specification, in which— .

Figure. 1/is an external view of my improved pump. Fig. 2, is a vertical section of the same, the plane* of section: being through the center. The flanched conical / rotating hub within the case is not bisected.

Fig. 3/is a view of the interior of the lower part of the case showing the stationary hub, having a socket in which the lower end of the shaft of the rotating hub revolves, and showing the spiral induction passages be20 tween the outer shell and stationary hub.

.In this view, the rotating hub is: removed. Fig. 4, is an interior view of the upper portion of the case, showing the spiral eduction ' passages.

Similar letters: of reference indicate corresponding parts in the several figures.

The nature of my invention consists, in having a hub in the form of an inverted cone with its apex removed, having one or 30 more radial arms or flanches attached longitudinally to its circumference, and decreasing in width as they approach the base. The said hub being placed within a case closely fitting it at top and bottom and the outer 35 circumference of the arms, and having induction passages of a spiral form with a gradually decreasing pitch, causing the water to pass from a straight line in the pipe below, by a gradually increasing spiral ⁴⁰ course to the point where it is acted upon by. the arms upon the rotating hub in its line of direction, and by the centrifugal force thereby imparted/ passing by the eduction passages gradually from a spiral again to a ⁴⁵ straight line, thereby avoiding all unnecessary friction and loss of power attending the changing the direction of the water at an angle, as in centrifugal pumps now in use.

To enable others skilled in the art to make ⁵⁰ and use: my invention, I will proceed to describe its construction and operation.

A, represents the lower portion of the case of the pump, which is of a conical form, _ as clearly shown in Figs. 1 and 2. In the ⁵⁵ lower end of the case, A, is a conical stationary hub, C, as clearly shown in Fig. 2, having a socket in which the lowest end of the shaft, D, revolves; or, as I prefer iii practice, a stationary point may. project above the hub, C, fitting into a socket in the «θ end of the shaft, D. This hub, C, is secured to the outer case A, by their flanches, Z>, as shown in Figs. 2, and 3, decreasing in pitch as they approach the top, (or base). The. shaft, D, has secured upon it the hub, E, in ₆₅the form of a cbne, with apex removed, so that the diameter of its lower or smaller end shall be the same as the base or upper part of the stationary hub, C, of which it is in shape a continuation, the angle of each being ₇₀slightly greater to the center than that of the case, A, causing them: to converge and making the space between both the conical ' hubs, G, and E. and the outer case, A,: narrower as its circumference increases/thereby 75 making the different sections of the 'space or passage, of the same, or nearly the same area. One or more thin flanches or arms, a, ' ^i:Fig. 2, are secured longitudinally upon the periphery of the rotating conical hub, E, go and extend radially to. the outer case,: A, as nearly as possible without touching, and longitudinally from the lower end of the hub, E, to a short distance above: its upper end, until they intersect a line'drawn across the 35 upper edge of the lower case, A, and terminating in a point, formed by their ends being made parallel to the shaft, D, as: shown in Fig. 2.,, The lower: ends of the arms are formed at right angles to the shaft, D, and 90 on a line with the bottom of the hub, E, as shown in Fig. 2. :,.

.: F, represents . the upper portion of the outer case secured to the lower portion, a, by flanches, I, I, and bolts, /, Fig. 2, and 95 having attached to its upper surface a spiral: pipe, G, of a gradually increasing diameter, and in its largest part of an equal or greater area than the passage between the hub, E, and the case, A, and communicating there- 100 with by an opening/ σ, through: the part, E, of the outer case, corresponding in form to, and,being an extension of said passage. In this opening, c, are secured spiral flanches, e, Fig. 4,; connecting the two sides thereof, 105 forming spiral passages of a. gradually increasing pitch from the passage to the pipe, G. These flanches, e, extend below the passage, c, into the passage within the case, A, and occupy the entire space radially,, not 110 swept by the arms, a, a. The shaft, D, passes through a stuffing box, H, secured upon the

11,544 upper portion, F, of the outer case, see Fig. 2.

The extension of the arms, a, above the hub, E, is for the purpose of relieving the 5 hub from the pressure of the head of water above, thereby obviating unnecessary friction upon the point of shaft, D.

Having given a full description of the manner of constructing my improved pump, 10 I now. state its operation. The pump being first immersed in, or filled with water, motion is communicated through the shaft, D, to hub, E, and arms, a, which, by the centrifugal force, will cause the water to flow 15 up the spiral passages formed by the flanches, e, into the pipe, G, and thence through suitable pipes as occasion requires. Discharging the contents creates a vacuum which is immediately supplied by water 20 rushing in through the induction pipe and spiral passages formed by the spiral flanches b, hub, c, and case, A,’ the water passing through the pump in one continuous unbroken volume in an easy spiral course, and 25 having the same area in all its sections, thereby avoiding all sudden turns and eddies, incident to a different construction. It must be understood that the induction . pipe is to be secured to the lower end of case, 30 A, by the flanch, /, and suitable bolts, care being always taken to have the induction pipe of the same area as the induction passages to avoid eddies in the same.