Improvements in Pumps Worked by Hydraulic Pressure.
Year: 1889

page_text: Date of Application, 9th Feb., 1889
Complete Specification Latt 9th Nov 1880 Accented 21st Dec 1889
PROVISIONAL SPECIFICATION.
Improvements in Pumps Worked by Hydraulic Pressure.
I. EDWARD BAYZAND ELLINGTON, of Palace Chambers, Westminster, in the County
of Middlesex, Civil Engineer, do hereby declare the nature of this invention to he as
follows
My invention relates to a compact and simple construction of pump worked by
bydraulic pressure.
The pump cylinder is fitted with a tubular plunger passing through packing at the
mouth of the cylinder, and this main plunger itself forms or contains a hydraulic
cylinder fitted with a stationary tubular plunger through which the high pressure
water passes into and out of the interior of the main plunger. On each side of the
main cylinder is a small cylinder; the two plungers of these are connected to a cross-
head attached to the main plunger. The small cylinders are always in communication
with the high pressure water supply which acts on their plungers with sufficient force
to cause the main plunger to make its backstroke. A single cylinder may be
employed but two are preferred so as to balance the effort. The stationary plunger is
alternately put in communication with the high pressure supply and with the
discharge by means of a slide valve which is moved to and fro by the hydraulic
pressure acting alternately in a short cylinder at each end of it. The alternation
of the pressure in these last mentioned cylinders is effected by the movement of a
secondary slide valve which is shifted by tappets on a rod attached to the main
plunger. The speed with which the main slide valve moves is controlled by more
or less throttling the passage from the secondary slide valve to its cylinders, both
of which may operate alternately, or one of which may always be in communica-
tion with the high pressure supply the other, which is larger, being alternately
put in communication with the supply and discharge by the movement of the
secondary slide valve.
Dated this 9th day of February 1889.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE
SPECIFICATION.
Improvements in Pumps Worked by Hydraulic Pressure.
I, EDWARD BAYZAND ELLINGTON, of Palace Chambers, Westminster, in the County
of Middlesex, Civil 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 a compact and simple construction of pump worked by
hydraulic pressure.
The pump cylinder is fitted with a tubular plunger passing through packing at
the mouth of the cylinder, and this main plunger itself forms or contains a hydraulic
cylinder fitted with a stationary plunger through which the bigh pressure water
passes into and out of the interior of the main plunger.
On each side of the main cylinder is a small cylinder; the two plungers of these
are connected to a crosshead attached to the main plunger.
The small cylinders are always in communication with the high pressure water
supply which acts on their plungers with sufficient force to cause the main plunger
to make is backstroke. A single cylinder may be employed but two are preferred so
as to balance the effort. The stationary plunger is alternately put in communication
with the high pressure supply and with the discharge by means of a slide valve which
is moved to and fro by the hydraulic pressure acting alternately in a short cylinder at
TUI

page_text: its end. The alternation of the pressure in this last mentioned cylinder is effected by
the movement of a secondary slide valve which is shifted by tappets on a rod worked
by the main plunger. The speed with which the main slide valve moves is controlled
by more or less throttling the supply to the secondary slide valve.
The accompanying drawing is a vertical section of a pump worked by hydraulic
pressure according to my invention. A is the pump barrel or cylimler having a
passage A to it from a suction valve and a passage A2 from it to a discharge valve,
these valves being of any known kind.
B is the planger which is hollow and has within it a smaller cylinder (in which
the hydraulic pressure acts. The plunger B works through packing Band is fixed
to a crosshead D) to which the cylinder (is also fixed. É is a tubular plunger which
is fixed to an overhead girder or frame and which passes through packing El into
the interior of the cylinder C. The girder or frame F is tied to the body A of the
pump by tie rods, which do not appear on the drawing because the one is in front of
and the other behind the plane of the section.
At each side of the main cylinder A there is a cylinder G the plunger of which is
always subjected to the pressure of the working fluid which is supplied by the pipe H
and ranch II. At the top of the tube E there is a slide valve K governing ports by
which the working fluid is supplied to and discharged from E, the discharge being
carried away by pipe II². The slide valve K nets as an ordinary D slide, buts its one
end, the right, forms a piston fitting a cylindrical part of the slide case, and its other
end, the left, projects through a stuffing box. Above the slide case is a subsidiary
slide valve L the case of which communicates by a passage with the case of K and
has another passage communicating with the discharge, this passage being provided
with a screw plug 31 by which it can be more or less throttled. The slide L is linked
to the short arm of a lever the long arm N of which is jointed to a rod O having
adjustable tapets on it. The roi O is guided through a hole in a bracket d pro-
jecting from the crosshead 1). The action of the apparatus is as follows:-Assuming
the pump plunger B to be nearly down to the position shewn in the drawing, the
bracket d in descending a little farther acts on the lower tippet lowers the rod and
moves the subsidiary sl de valve 1. to the left. This allows fluid to enter the right
hand cavity in the case of the slide K, causing a pressure on the piston of that slide,
which is thereupon forced to the left. By the movement of the slide valve K to the
left the tube E is put in communication with the discharge pipe H relieving the
pressure in C, whereupon the plungers of the side cylinders Gascend, raising B
and so as to draw a charge of liquid into the barrel of the pump A by the
passage A. When the bracket d meets the upper tappet on the rod 0, a converse
action of the two slide valves L and K takes place, cutting off the communication
from E to the discharge and opening communication from H to E. The pressure
then acting in the cylinder O forces down the pump plunger B causing the liquid to
be discharged from the pump by the passage A².
The cycle of aution is then repented.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what I
claim is :-
A pump worked by hydraulic pressure so arranged that the pump plunger is forced
downwards by the pressure of the working fluid admitted to its interior through a
stationary tubular plunger, and, when the pressure within it is relieved, is forced
upwards by plungers of smaller area always subject to the working pressure, the
alternation of the pressure within the plunger being determined by a slide valve
which is itself moved by pressure and relief of pressure of the working fluid, alter-
nated by a subsidiary slide valv, moved by tappets acted on by the pump planger as
it approaches the extremes of its strokes, substantially as described.
Dated this 8th day of November 1889.
ABEL & IMRAY,
Agents for the Applicant.