Improvements in Rotary Pumps for Raising and Forcing Liquids.
Year: 1887

page_text: Date of Application, 7th Sept., 1887.
Specification Accepted, 7th Oct., 1887
Improvements in Rotary Pumps for Raising and Forcing Liquids.
I, ROBERT HENRY BROWNHILL of 27, Higher Ardwick, Manchester in the County
of Lancaster, 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 :-
My Invention relates to Improvements in rotary pumps for raising and forcing
liquids and the object of my Invention is to simplify and improve. the construction
and to diminish friction in the working of such pumps.
I attain this object by the mechanism illustrated in the accompanying three sheets
of Drawings in which
Figure 1 is a longitudinal vertical section of the improved rotary pump
constructed according to my Invention.
Figure 2 is a transverse vertical section taken on the plane of the line A B Fig. 1
Figure 3 is a transverse vertical section taken on the plane of the line C. D. Fig. 1
Figure 4 is a sectional end view of the cylinder cover and piston on the plane of
the line E F Fig. 1.
Figure 5 is a sectional end view of the cylinder cover and piston on the plane of
the line GH Fig. 1.
Similar letters refer to similar parts throughout the several views.
means in a standard c.
or other
In these views a designates a stationary shaft which is secured by a key
On the shaft a is fitted and free to turn a cylinder d provided
at one end with a stuffing box d¹. At the other end the cylinder cover into which
the end of the shaft a is fitted is formed with a hollow extension or tubular shaft e
supported and free to revolve in a delivery box or chamber f which is divided into
two compartments or passages of which the passage fleads to the inlet for
liquid and the other passage f' to the outlet. The division of the chamber finto
two passages as described is effected by two division blocks or slides g which are
secured adjustably in the casing by straps g' and screws g³ and by means of the latter
the blocks may be set up to make a watertight joint between the shaft e and the split
bush which preferably lines the chamber f. To prevent any leakage the chamber f
is provided with stuffing boxes i through which the shaft e passes. The shaft e is

page_text: divided longitudinally by a central wall or partition e¹ into two compartments or
passages at one end having ports opening into the cylinder d and at the other
end having ports et e respectively which when the shaft e is rotated
placed alternately into communication with the inlet passage f1 and the outlet
passage f
are
Within the cylinder d is fitted a hollow piston k connected by a rod k¹ to a crank a¹
on the shaft a, or an equivalent for the crank such as an eccentric or a block and slide
motion might be employed. The piston & has upon it at one or both ends slide
blocks which are fitted and free to slide in guides or slideways b formed on or
secured at one or both ends of the cylinder. The opposite sides of the cylinder are
provided at 2 with two plain parallel surfaces which act as guides for two brass or
other strips m fitted in recesses in the piston k and provided with springs m¹ to keep
them constantly in contact with the surfaces & so that by means of the strips m the
cylinder d is divided longitudinally into two compartments.
On the shaft a is fixed a handle n by means of which the shaft a when the key b
or its equivalent has been withdrawn or released may be turned on its axis to reverse
the position of the piston k.
The action of the apparatus is as follows:-To start the pump rotary motion is
imparted to the cylinder d by means of a belt or by gearing or any convenient
means and as the cylinder turns the slideways and slides carry the piston k round
with it and the stationary crank a' or its equivalent also causes the piston k to oscillate
i.e. to move to and fro at right angles to the axis of the shaft a.
For convenience of description I will describe the first stroke as beginning when
the parts are in the relative positions illustrated by the Drawings in which case when
the piston k actuated as described begins to move away from one side of the cylinder d
in the direction indicated by the arrow Fig. 1 the hollow shaft e as it turns with the
cylinder d brings the port e opposite the beginning of the inlet passage fl see Fig. 3.
thereby placing the interior of the cylinder d by means of the passage e in the hollow
shafte into communication with the inlet. As the piston k continues to move away
from this side of the cylinder a partial vacuum is formed and liquid from the inlet
passage is drawn through the port et and passage into the cylinder d on that side
of the piston k which is travelling away from the side of the cylinder and this action
proceeds until by the continued revolution of the cylinder the piston k reaches the
opposite side of the cylinder and the port e leaves the inlet passage f¹ and occupies
the position shown as filled by the port e in Fig. 3 the port e at this time being of
course in the position vacated by the port e. The motion of the piston k is next
reversed and it begins to return to the position from which it started at the beginning
of the stroke and simultaneously the port e' approaches the outlet passage f' while the
port e approaches the inlet passage fl whereby as the action continues the piston k
forces out through the passage e and port e the liquid previously drawn into the
cylinder d through them and discharges the said liquid through the outlet
passage f
The cylinder d is divided as already mentioned into two compartments by the piston
and the strips m and as the piston is discharging liquid from one compartment through
the passage e and port e as above described it is simultaneously drawing liquid from
the inlet passage 1 through the port and passage e³ into the other compartment
of the cylinder.
From the foregoing description it will be at once apparent that at each complete
stroke or revolution of the cylinder d liquid is drawn from the inlet into the cylinder
alternately through the ports e e and discharged from the cylinder alternately through
one or other of the said ports, that is to say the piston is drawing liquid through one
port and discharging liquid through the other port for about half a revolution while
for the other half revolution its action is reversed and the port which was previously
used for suction becomes the delivery port and vice versa.
The action of the pump can be reversed by simply withdrawing the key b to release
the shaft a and turning the shaft half round, or any suitable reversing motion may
be employed.

page_text: Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed-1 declare that what I claim is-
1. The herein described improvements in rotary pumps consisting chiefly in the
combination with a rotary cylinder provided with passages and ports which by the
rotation of said cylinder are placed alternately in communication with suitable inlet
and outlet passages, of a piston which revolves with said cylinder and also oscillates
or moves to and fro at right angles to the cylinder axis substantially as and for the
purposes specified and as illustrated by the Drawings annexed.
2. The combination of the shaft a having a crank or equivalent, the rotary cylinder d
mounted on said shaft, the piston k arranged to revolve with the cylinder and con-
nected to and operated by the crank or equivalent, the strips m or other suitable
means for dividing the cylinder, the cylinder extension having passages and
ports ee, and the hollow box or chamber f divided into inlet and outlet passages f¹ f
respectively all constructed arranged and operating substantially as and for the
purposes herein described and as shown.
3. The combination with the rotary cylinder d the piston k and the crank shaft a
or its equivalent, of the cylinder extension e constructed and arranged substantially
as and for the purposes herein described and as shown.
4. The construction use and application of the rotating part or cylinder extension e
provided with a wall or partition and passages and ports substantially as and for the
purposes herein described and as illustrated by the Drawings annexed.
5. The combination with the rotating part or cylinder extension e, of the box or
divided chamber f provided with inlet and outlet passages substantially as and for the
purposes herein described and as shown.
6. The general construction combination and arrangement of parts embodying my
improvements in rotary pumps substantially as herein shown and described.
Dated this 6th day of September 1887.
H. B. BARLOW,
17, St. Ann's Square, Manchester,
Agent for Applicant.