Improvements in Pumping Apparatus, more especially intended for use as an Air Pump for Condensing-engines.
Year: 1890

page_text: Date of Application, 6th Nov., 1890-Accepted, 6th Dec., 1890
COMPLETE SPECIFICATION.
Improvements in Pumping Apparatus, more especially intended for
use as an Air Pump for Condensing-engines.
I JOSEPH WRIGHT of 16 Great George Street in the City of Westminster
Mechanical 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 has for its object to provide a pumping apparatns wherein the dead
points of a duplex motor are so arranged relatively to the dead points of a duplex
pump that the action of the apparatus is rendered very equable and power is utilised
to the best effect. This I attain by connecting the piston rods of two motor cylinders
to two cranks at right angles to each other on one and the same shaft and by
connecting the piston rods of two pumping cylinders to two other cranks also on one
and the same shaft with the motor cranks these two other cranks being diametrically
opposite each other, one being at or about the same angle as one of the cranks of
the motors and the other being at or near a right angle to the other crank of the
motors.
I also provide chambers and valves in connection with the pumping cylinders so
that the said cylinders can be used either separately or both as one pump.
The accompanying drawings represent a pumping apparatus constructed according
to my invention, Figure 1 being a front elevation, Figure 2 a side elevation,
Figure 3 a plan, Figure 4 a horizontal section (on the line 1, 2, Figure 1) and
Figure 5 a vertical section (on the line 3, 4 Figure 1).
A A² are the motor cylinders and B B² are the pumping cylinders.
The piston rods a a² of the motor cylinders are connected by the connecting
rods a³ a to the cranks c c² on the crank shaft C which crank shaft C is mounted in
bearings carried by standards D D which carry guide d for the cross heads 6 6²
of the pumping cylinders.
The piston rods 636 of the pumps are connected by the connecting rods 66 66 to
the cranks c3 c of the shaft C. The cranks c c² and c3 c are arranged at the points
(or nearly so) around the circle of revolution of the crank shaft shewn in the diagram
Figure 14.
E are the fly wheels and F is the governor which is actuated by the gear and acts
by the rod f upon the throttle valve g in the steam pipe G supplying steam to the
cylinders A A2.
The pump cylinders B B2 at bottom communicate with the double chamber H H²
livided by the partition h there being an opening in the said partition capable of
being closed and opened by the valve ². The pump cylinders at top communicate
with a double chamber I I2 also divided by a partition i with an opening therein
which can be closed or opened by the valve 2. The pipe ³ leads from the condenser
o as to enable the pump to draw in water steam and air from the said condenser and
he pipe leads to a supply from which water can be drawn when required. It can
e closed by the valve . The pumps deliver by the pipes jj into the chamber I
hich is provided with a pump K operated by an eccentrick from the crank shaft C.
his pump delivers feed water through the pipe 3 from the chamber I or hot well
to the boiler preferably through a feed water heater or economizer. The other end
f the chamber I is provided with a pipe communicating with the water space of
he condenser. It can be closed by the valve . The valves supplying steam to the
otor cylinders (and actuated from the shaft C by the rods 7) should be so arranged
at the steam ports of the motor cylinders are not all closed at the same time so that
the apparatus stops (owing to excess of vacuum for instance) it will start again
hen the cause of stoppage has ceased The pumping arrangement can be used to

page_text: pump for any required purpose or purposes by making the inlet pipe or pipes
communicate with the places from which the liquid gas or vapour is to be drawn and
by making the outlet pipe or pipes communicate with the place to which they are to
be delivered but I will presume the pump is to be used for the purpose of either
simply pumping as an air pump from the condenser or of doing both this and for
pumping the cooling water through the condenser when the pipes communicate as
hereinbefore named. If the apparatus is to be used as an air pump only the
valves are closed and the valves are opened. If the cylinder B only is to
be used as an air pump and the cylinder B2 is to be used for pumping water through
the condenser the valves are closed and the valves are opened. The apparatus
may be used for pumping for any number of engines and boilers put into connection
with it.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
First. The arrangement and combination of parts constituting the pumping
apparatus substantially as herein before described and illustrated in the accompanying
drawings.
Second. In pumping apparatus, two motor cylinders and two pumping cylinders
the said motor and pumping cylinders having their pistons connected to cranks on
one crank shaft the said cranks being arranged relatively to each other substantially
as herein before described.
Third. In pumping apparatus a duplex inlet chamber and a duplex outlet chamber
and inlet and delivery pipes or passages and valves in connection with the said
chambers and pipes or passages so arranged that the apparatus can be used either for
simple or for duplex pumping substantially as herein before described.
Dated this 6th day of November 1890.
J. H. JOHNSON & Co.,
Agents.