MENTS IN PUMPING ENGINES
Year: 1885

page_text: FULL ME
144
I, GEORGE PARFITT, of Green Lawn, Penylan, Cardiff, in the County of
Glamorgan, Engineer, do hereby declare the nature of my invention for "IMPROVE
MENTS IN PUMPING ENGINES," and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:-
My invention has for its object the introduction of an improvement into the
construction of pumping engines, and consists in the substitution of a single
cylinder for the well-known two separate cylinders.
In carrying our invention into effect we connect two or more cylinders to the
same crank, the throws following each other at convenient angles.
I do not, according to our invention, confine myself to any particular motor
fluid, inasmuch as steam, compressed air, or any other elastic fluid may be used.
It is, however, advisable to select one of as low an initial temperature as possible
to prevent loss of energy by condensation.
Each cylinder combines in itself the double function of engine and pump cylinder.
The motor piston is, as such, of the usual and well-known construction, but is
continued upwards into a trunk of suitable length, the diameter of which is
sufficiently less than that of the motor piston to produce an annular space in the
cylinder equivalent to the required capacity of the pump.
In order that my invention, and the means of putting the same into practical
effect, may be thoroughly understood, I will proceed to describe the same in detail,
referring in so doing to the accompanying drawings which are to be taken as part
of this specification and read therewith, and in which like parts are marked
throughout the figures in which they occur with the same reference letter.
Fig 1 is an elevation, partly in section, shewing my invention as a three cylinder
pumping engine.
The left hand cylinder has the piston and trunk at the top of the stroke, the
contents of the annular space, or pump cylinder, having just been discharged.
Fig. 2 is a plan of the same, also partly in section.
Fig 3 is a transverse sectional end elevation, taken through the axis of the
cylinder, the piston having just passed the point of half-stroke.
The action of my improved pumping engine is as follows.
On the steam, or its equivalent, being admitted by the supply, H, to the valve
chest, C, (which is of the ordinary construction), it passes by a suitable port into

page_text: the engine cylinder D, and under the piston A. This may be of any ordinary and
well-known construction with respect to its functions as the motor piston. It is,
however, extended upwards into a trunk L. This trunk fitted with suitable
bydraulic packing, a, and working through a suitable stuffing box M, forms the
pumping piston. Its diameter is always less than that of the motor piston to the
extent of producing, during the down stroke, an annular space between it and the
cylinder D which in this way combines in itself the double function of motor and
pump cylinder. The capacity of the annular space is always equivalent to the
volume of liquid to be raised per stroke.
The up stroke of the combined piston and ram discharges the volume of liquid
collected in the annular space before described when the return stroke is effected
by the upstroke of the motor piston in the adjoining cylinder, or in one of them.
This return stroke of the motor piston is consequently the suction stroke of the
pumping piston, the waste steam or equivalent escaping at I.
All pistons and valves of my improved pumping engine are driven direct from
the crank shaft K, (as indicated in Fig 1) which carries suitable flywheels.
F is the suction inlet and G the discharge orifice from the discharge chamber O.
N is an inlet chamber formed in the base of the engine, and P, a valve chamber
controlled by pump valves E.
In constructing a pumping engine according to my invention, I prefer to make
one pair of main inlets and outlets for motor fluid and liquid to be raised serve all
the cylinders.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. In a pumping engine the combination of motor piston and trunk of a propor-
tioned smaller diameter, both working in one cylinder, substantially as described
with reference to the accompanying figures.
2. The combination of two or more cylinders, pistons, and trunks as defined by
the foregoing claim, substantially as described with reference to the accompanying
figures.