Improvements in or relating to Rotary Pumps.
Year: 1896

page_text: Date of Application, 30th Mar., 1896-Accepted, 2nd May, 1896
COMPLETE SPECIFICATION.
Improvements in or relating to Rotary Pumps.
We, HERBERT MORRIS, and FRANK BASTERT, both of 211 Upper Thames
Street, London, Engineers, 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 that class of rotary pump in which pistons in their
travel around with the shaft engage in succession in hollows of a revolving drum,
and which during such travel draw water or fluid from a pipe, pass it some distance
round within a cylinder, and discharge it to a pipe for ultimate delivery.
In such pumps the revolving bodies are under heavy thrust of the water or fluid
on account of the great amount of surface exposed by these bodies.
These thrusts cause the bodies to bear against the cylinders and cause loss of
power, undue wear, and loss of efficiency.
For the purpose of our invention, we duplicate the pistons on a mid-feather
forming part of a boss which we secure to the main shaft, the edge of said mid-
feather fitting close up to the cylinder, coincides with the outer edges of the
pistons.
Directly under this mid-feather is a horse shoe shaped plate of the same width as
the mid-feather, on which at a cut-away part the mid-feather has rotation, said
plate being notched or crutched partly embracing the shaft of the drum and
separating the two drums, both of which are keyed to a second shaft which is
rotatable by outside gear with gear of the main shaft for rotating therewith.
The cylinder covers are formed internally with sleeves, or have sleeves affixed to
them projecting inwardly over the upper shaft and occupying a position between
the pistons, the mid-feather and its bosses, but do not revolve. The lower
peripheries of these sleeves are cut away and so shaped that the drums on the lower
shaft ride in these hollow or cut away parts and prevent passage of water or fluid.
The drums have peripheral openings or hollows, and are so arranged that the
pistons engage successively in them while both pistons and drums rotate.
Our invention is clearly represented on the accompanying drawings.
Figure 1 is a longitudinal section of our rotary pump.
Figure 2 transverse section on the line x, x, of Figure 1.
Figure 3 another similar transverse section, except that the pistons and drums
are shown in different positions.
A is the bed plate with pedestal bearings B, B, for supporting the two shafts C, C',
the upper C of which is somewhat longer for carrying the driving pulley D.
These shafts C, C, have spur toothed wheels E, E', on them in gear, in order that
the lower shaft C' can be driven from the upper one C.
F is a double-bellied cylinder, in the upper half of which the pistons G, G, G,
travel round, these projecting from the two side faces of a mid-feather H which is
keyed by its boss 1 on the upper shaft C.
There are three pistons on each side of the mid-feather and they engage in
succession in the hollows J, J, of a couple of drums K, K, the vanes of which ride
close to the inner periphery of the lower half of the cylinder F.
M, M, are sleeves or inner extensions of the end covers N, N, of the double-bellied
cylinder F, which sleeves project up to the mid-feather H. The mid-feather H is
a complete disc but the lower part of each of the two sleeves is cut away and
corresponds with the periphery of the two drums, as clearly shown by the sectional
views Figures 2 and 3.

page_text: The drums K, K, are separated by a plate P of horse-shoe shape which occupies
such a position that the disc or mid-feather H rides close on to it, and so that it
serves as a fill-gap under the mid-feather H.
Q, Q, are spaces in the inner periphery of the cylinder, connected by channels R, R,
with the suction side S, and the delivery side T respectively.
The hollows in the peripheries are in the full length of the two drums, and these
correspond with the length of the pistons G, G, which enter them without ever
being in contact, there being a positive clearance between them as indicated by the
sectional elevation, Figure 3, the rotation of the drums being so timed with that of
the pistons that they never touch each other.
The two drums are keyed on the lower shaft C', as shown, and the ends are
provided with ring flanges U, U, recessed into the cylinder covers N, N, where
they become lubricated from the oil holes V, V, or from the tubular liners W, W,
of the stuffing boxes X, X, side flanges also preventing escape of water or fluid at
those parts.
The action of our improved rotary pump is as follows:-When the pistons G
travel in the direction of the arrows, S is the suction side and T is the delivery
side. The shaft C is rotated by the pulley D, the shaft C following by the
gearing of the gear-wheels E, E. The pistons as they rise above the inlet create
a suction, and water or fluid flows into the upper half of the cylinder, the vanes a
of the drums closing the pussage from b to e between the cylinder mouth and the
sleeves M, M, so that the water or fluid follows the pistons. When the pistons
have travelled upwardly a certain distance, the vanes a of the drums have travelled
downwardly until the following pistons emerge from the hollow between the two
vanes, and these then become the suction pistons, at the same time they pocket the
water or fluid which the previous pistons had sucked up, so that said body of
water or fluid is carried round to the outlet T where the first of those two pistons
enter other hollows of the rotating drums, the next vanes of which close the
passage between the cylinder throat and the sleeves, consequently the water or
Huid passes by the outlet T under pressure of the next descending pistons.
In Figure 3, the surface from d to e is under the thrust of delivery, and the
surface from 6 to c is under the thrust of suction.
The extent of the surfaces thus affected varies according to the position of the
vanes.
In order to counteract these thrusts, we arrange the hollows J in the body of
the drums symetrically, so that a hollow is diametrically opposite a hollow, and a
vane is diametrically opposite a vane, and we make fluid spaces Q, Q, from 1 to 8¹,
and from p¹ to q¹ in the cylinder opposite to and of a width proportionate to the
mouth b to e and the throat d to e respectively.
These fluid spaces are connected respectively to the suction and delivery side
by channels R, R, made in the cylinder covers or outside.
As the thrusts of the water or fluid in these spaces on the body of the drums
are practically equal to the thrusts of the column of water or fluid on the
exposed surfaces on the suction and delivery sides respectively, they balance each
other and relieve the peripheral surfaces of the drums from frictional contact
with the cylinder, and the shaft in its bearings from the friction due to those
thrusts.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In a rotary pump, the combination of travelling pistons G, rotating drums K,
mid-feather H, plate P, cylinder cover extensions M, and channels R, R, with
spaces QQ, all arranged as and in the manner specified and substantially as
represented.
2. In a rotary pump, the means for balancing of the thrusts of suction and
delivery on the drums by connecting the suction side by channels with a space in

page_text: the cylinder opposite the surface under thrust on the suction side, and by connecting
the delivery side with a space in the cylinder opposite the surface under thrust
on the delivery side, as described and shown in the drawings.
Dated this 30th day of March 1896.
H. GARDNER,
Patent Agent, 166 Fleet Street, London,
Agent for the said Herbert Morris and Frank Bastert.