IMPROVEMENTS IN CENTRIFUGAL PUMPS
Year: 1886

page_text: Date of Application, 5th July, 1886.
Specification Accepted, 3rd May, 1887.
I, GEORGE YELLOTT, of Towson, in the County of Baltimore and State of Maryland,
one of the United States of America, Chief Judge of the Third Judicial Circuit of
Maryland, do hereby declare the nature of my invention for IMPROVEMENTS IN
CENTRIFUGAL PUMPS, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
In the drawings forming a part hereof,
Figure 1 is a vertical section of the invention, and Figures 2, 3 and 4, details of the
same, as will hereinafter fully appear.
A is a tank, to which water to be elevated is introduced by any suitable means, and
it is to be kept nearly or entirely filled.
B is a box of circular or polygonal shape, having a central, circular aperture a in its
head b.
C is a cylindrical chamber on the head b of the box B. This chamber has also a
central aperture c in its head d, and above the aperture c is a cross-pipe D, open at
its ends. The chamber C has radial partitions e, (see particularly Fig. 2,) which
extend from the periphery of the chamber to the central aperture a.
C is a plate cast with or secured to the partitions e, and it is of a less diameter than the
interior of the chamber C, in order to obtain the annular space e' which is in commu-
nication with the spaces between the radial partitions e.
E is a shaft which passes loosely through the plate C₁, and is supported at the
lower end by a step in the box B.
FF are vanes projecting from a central hub g secured to the shaft E at a point
within the chamber Cand immediately above the plate C¹ therein.
Fig. 4 is a plan of the vanes.
G is a reaction wheel, fastened to the central shaft E, having a hollow hub h which
enters the central aperture a in the head 6 of the box B. The reaction wheel consists
of two pipes projecting from the central hub with their discharge ends turned in
opposito directions. (See Fig. 3.)
HH are air-vessels, connected to the box B, and I I are discharge pipes which
extend to near the bottom of the said box.

page_text: Supposing all the various chambers and spaces except the air vessels to be filled
with water and the pump in operation, the water on the plate C¹ is made to revolve
with the vanes F, and centrifugal force impels this revolving body of water to pass
outward and downward through the annular space e¹ to between the partitions e, and
finally to the interior of the reaction wheel G which discharges its contents to the
box B. As water is driven from the plate C, its place is supplied through the pipe D
and the central aperture c.
The object of the partitions e is to prevent water in the chamber C from acquiring a
circular movement. When pressure is increased in the box B, air is compressed in
the air-vessels H and a regularity of discharge through the pipe I maintained.
I do not confine myself to the use of the tank A, as the water may be supplied
directly to the pipe I, and in some cases to the aperture c.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed, I declaro that what I claim is―
1. In a centrifugal pump, the combination of revoluble vanes and a reaction wheel
adapted to revolvo in separate chambers, having a communicating aperture to admit
water forced from the said vanes to the interior of the reaction wheel, substantially as
specified.
2. The box B, having discharge pipes I, and the revoluble reaction-wheel G, in
combination with the chamber C and the vanes F, substantially as specified.
Dated this 17th day of April 1800.
GEO. YELLOTT.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C.,
Agents for Applicant.