Improvements in Rotary Apparatus suitable for use as Pumps, Blowers, Exhausters, Motors, Meters and the like.
Year: 1898

page_text: Date of Application, 27th May, 1898-Accepted, 9th July, 1898
COMPLETE SPECIFICATION.
Improvements in Rotary Apparatus suitable for use as Pumps,
Blowers, Exhausters, Motors, Meters and the like.
I, ARNOLD GOODWIN, of 54, Summer Street, Southwark, in the County of London,
Engineer, 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 improvements in apparatus suitable for use as pumps,
blowers, exhausters, air compressors, motors, meters, and the like of the kind wherein
a circular plate is mounted to rotate within a casing and is provided with lateral
projections that serve as pistons arranged to travel in a part annular space or way
formed within the casing and to work in radial slots in a rotatable disc mounted
eccentrically within the casing between the inlet and outlet ports so that all fluid
entering the inlet port has to pass along the part annular channel before it can pass
off by the outlet. port.
In such apparatus as heretofore constructed, it has been found in practice that
when each piston enters a slot in the rotatable disc, the fluid in the said slot is
confined therein and offers a resistance which has a retarding effect upon the working
of the apparatus. Furthermore the lateral pressure of the fluid upon the circular plate
carrying the pistons tends to force it away from the rotatable disc and against one
end of the casing thereby causing leakage and friction and consequent defective
working of the apparatus. Also access to the interior of the apparatus was impossible
without disturbing the driving shaft and attached parts.
Now this invention has reference to improved constructions and arrangements
of apparatus of the kind referred to whereby the above mentioned disadvantages are
obviated and the apparatus adapted for various useful purposes as I shall now describe
by the aid of the accompanying illustrative drawings in which
Figs. 1 and 2 are vertical sections taken in planes at right angles to each other
showing my improved apparatus adapted for use as a pump.
Figs. 3 and 4 show the apparatus in plan and end elevation respectively.
1 is a circular plate fitted to rotate within the circular portion of a casing 2 which
is provided with oppositely arranged inlet and outlet branches 3 and 4 respectively, a
removable end cover 5, and a closed end 6 carrying a long bearing 7 having a stuffing
box 8 at its free end. The plate 1 is fixed upon a driving shaft 1ª that extends
through the bearing 7 and stuffing box 8 and is provided at its outer end with a
driving pulley 1b by which it can be driven by means of a belt, sometimes I couple
the crank shaft of a steam engine direct to the shaft 1" in which case the engine and
pump may be both arranged on one bed-plate.
In small sizes, a handle can be fixed to the shaft 1ª for driving by hand power. The
periphery of the plate 1 is flanged, as shown at 1°, so as to provide a large surface
between it and the interior of the casing that will prevent fluid being readily forced
from the pressure or delivery side of the pump across the back of the plate to the
suction or supply side of the pump and so interfere with the efficiency of the
apparatus. To further prevent any such return flow of fluid, the flanged part of
the plate may be provided with an annular groove 1d.

page_text: the casing 2 through a passage 18 in the shaft 1ª, as shown in Fig. 4, or indirectly
from the chamber 2 through the said passage in the shaft.
Although the apparatus herein before described is referred to as a pump, it will be
obvious that it is equally applicable as a blower or exhauster and also as a motor if it
be supplied with fluid under pressure. It will also be obvious that such apparatus
admits of considerable modification for the purpose of adapting it to various uses.
Figs. 5 to 13 inclusive show several of such modifications.
Fig. 5 shows in side elevation, two apparatus constructed as herein before described
(but without the equalizing pressure pipe and chamber) oppositely arranged and
having a common driving shaft 1 by which arrangement the working pressures
and strains are balanced and the two apparatus caused to run in equilibrium.
In Fig. 6 is shown in elevation a pump arranged in a well or shaft containing water,
the driving spindle 1ª being placed in the rising main 21 and driven by suitable
driving mechanisın 22 at the top of the wall. 23 is the suction pipe. It will be
obvious that a pump so arranged may also be used as a turbine or water notor, in
which case the rising main 21 becomes the pressure water supply pipe.
Figs. 7 and 8 show respectively in side elevation and plan, two sets of apparatus of
the kind herein before described arranged for use as a water meter. In this case the
two circular plates carrying the pistons are fixed upon a common shaft that is
connected by suitable means, for example a worm 24, with the counting or recording
mechanism 25, and the inlets 3 and outlets 4 are connected to common supply and
delivery pipes 3" and 4ª respectively.
Figs. 9 and 10 show in vertical section and plan respectively, and Fig. 10 in
horizontal section on the line XY of Fig. 9 a single apparatus of the kind herein before
described arranged as a water meter, the outer end of the spindle 1" being geared to
the counter 25.
Fig. 11 is a longitudinal section and Fig. 12 a plan partly in horizontal section,
showing the apparatus adapted for use as a pressure blower, vacuum pump or gas
exhauster. In this arrangement the casing 2 is formed with a reservoir 26 to contain
a suitable liquid, for example neatsfoot oil or water, for producing an efficient air or
gas seal between the rotary disc 11 and the bottom and adjacent side of the casing 2
and plate 1 and between the latter and pistons 14 and the parts in contact with which
they work. The outlet branch 4 is shown provided with an intercepting or baffle
plate 27 which serves to separate the oil or water from the escaping air or other
gaseous fluid and to cause it to be returned to the reservoir 26 for reuse.
Fig. 13 shows in longitudinal section the apparatus combined with a jet condenser
so as to form a combined air pump and jet condenser. 28 is the inlet for injection
water; 29 the exhaust steam passage; and 30 the condensing chamber in connection
with the inlet branch 3 of the pump casing 2.
Apparatus of the kind herein before described can be made in any suitable material
as well understood.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. In apparatus of the kind herein referred to, providing the rotary dise 11 with a
passage adapted to connect the radial slots in such disc so that fluid can pass from
one slot to the other, substantially as herein described for the purpose specified.
2. In apparatus of the kind herein referred to, the combination with the circular
plate carrying the pistons, of means adapted to counteract the lateral pressure on such
plate and the shaft carrying the same of the fluid passing through the apparatus,
substantially as described.
3. Apparatus of the kind herein referred to, wherein there is provided in addition
to the fluid pressure chamber between the rotary plate carrying the pistons and the
adjacent end of the casing a supplementary pressure chamber that is connected with
the main fluid passage through the apparatus and is fitted with a piston arranged on
the driving or driven shaft carrying the said plate, the arrangement being such that the