Improvements in Rotary Pumps.
Year: 1897

page_text: Date of Application, 1st Dec., 1897-Accepted, 12th Mar., 1898
COMPLETE SPECIFICATION.
Improvements in Rotary Pumps.
I, HUGO FÖRSTER, of Gorsdorf, near Jessen, Prussia, Mill Owner, do hereby,
declare the nature of this invention and in what manner the same is to be
performed to be particularly described' and ascertained in and by the following
statement: -
This invention relates to a rotary pump which is so constructed as to be capable
of delivering any desired quantity of fluid at any desired height.
In a pump according thereto the direction of flow of fluid being pumped is not
appreciably altered during its passage through the pump and, which is very
important, the drawback arising in the case of centrifugal pumps from the rotary
and whirling motion whereby a very considerable loss of useful effect is produced,
is avoided by compelling the fluid entering the pump to preserve the direction
of its motion and to be delivered from the punip almost in the same direction
into the delivery pipe or discharge pipe.
Figs. 1 and
of the accompanying drawings are respectively a sectional elevation:
and a cross section of a pump according to this invention;
Fig. 3 illustrates a modification thereof.
The pumping apparatus is contained in a casing and consists essentially of
alternately fixed and movable wheels. It is generally sufficient to employ the
arrangement shown in Figs. 1 and 2 in which the movable wheel e is surrounded
by two fixed wheels b and c. The fluid enters the casing from the pipe at m and
impinges first upon the inner fixed wheel b. The inclined blade surfaces of the
movable wheel e then, so to speak, cut it and force it through the outer wheel c
into the part h (Fig. 1) of the pump casing and thence into the delivery pipe at i.
The movable wheel is keyed on a shaft a which runs preferably in a ball bearing k.
The blades of the wheels are so arranged that the blades, f of the inner wheel b,
and the blades g of the outer wheel c, are situated approximately in the direction.
of the motion of the fluid. It is obvious that the blades d of the movable wheel e
are suitably inclined relatively to the blades of the fixed wheels and
the inclination of these blades determines the efficiency of the work done.
that
The fixed wheels may be mounted by connecting them, as shown, with the
cover of the casing, the outer and inner wheels c and d being fastened to the
cover by screws according to the lines and y y respectively. The movable
wheel e consists of a metal body p into which the steel blades proper d are set.
The connexion of the cover with the casing o is effected in the well-known
manner by means of screw bolts n.
If the height of delivery of a pump of this kind is to be increased, it is merely
necessary to insert a further set of wheels into the arrangement, as indicated in
Fig. 3.
In this case there are four fixed wheels r, s, t, u, between which rotate three
inovable wheels x, y, z. Let is be assumed, for example, that on account of the
inclination of the blades of the wheel z relative to the two wheels r and s, there
is produced a height of delivery of 30 metres, then by employing the next
following set of wheels a height of delivery of 60 metres will be obtained; whilst
by employing a third set of wheels, height of delivery of 90 metres can be obtained.

page_text: In addition to the fact hereinbefore stated, that the loss of useful effect, occurring
in centrifugal pumps as a result of the whirling motion of the revolving water, is
obviated with this construction, the dimensions of the several parts may be made
much smaller than heretofore, which entails the further advantage that the
erection of a pump according to the present invention is rendered more practicable
and easier than that of pumps heretofore known, apart from the fact that of
course the weight of the pump becomes less, and the cost of manufacture thereof
is also very much lower than that of other known pumps.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed, I'declare that what I
claim is:
1. A. rotary pump in which the fluid whilst passing through the moving
wheel e is maintained in its direction of flow by means of guide-wheels b
and e arranged in front of and behind the said moving wheel e, so that whirling
movements are obviated, whilst the propulsion of the fluid is effected by the
inclined surfaces of the blades d of the moving wheel e.
2. Rotary pumps constructed, arranged, and operating substantially as herein-
before described with reference to and shown in Figs. 1 and 2, or as modified
according to Fig. 3, of the accompanying drawings.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.