Automatic Apparatus for Throwing the Load On or Off Pumps.
Year: 1898

page_text: Date of Application, 29th June, 1898
Complete Specification Loft D2nd than 1500 Accented
22nd An
1000
PROVISIONAL SPECIFICATION.
Automatic Apparatus for Throwing the Load On or Off Pumps.
We, THE HYDRAULIC ENGINEERING COMPANY LIMITED, of Charles Street, Chester,
and WILLIAM CARTER, Engineer, of 1, Hunter Street, Chester, do hereby declare
the nature of this invention to be as follows;-
This invention relates to apparatus whereby the load is automatically thrown
on or off sets of pumps in a graduated manner so as to avoid shock to the electric
motors or engines which work them.
For this purpose, the accumulator which is supplied by the pumps and which
ascends and descends according as there is less or greater demand for pressure
water on the service, acts on tappets which are connected by a loaded cord or
chain to a rotating shaft or a sliding bar. On the shaft there are cams one for
each pump or on the sliding bar there are sloped cam paths one for each pump,
the cams being so set on the shaft or the cam paths on the sliding bar that they
come successively into operation to raise and keep raised the suction valves of
the pumps, allowing the water drawn in at each stroke to pass back to the supply
main. Thus as the accumulator rises pump after pump is rendered ineffective for
forcing water, and as the accumulator descends, pump after pump is rendered
effective. By thus automatically throwing pump after pump out of or into
operation, the motor or engine which works the set of pumps is relieved from
the shock which would attend the stoppage or the starting of all the pumps
simultaneously.
Dated this 29th day of June 1898.
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Automatic Apparatus for Throwing the Load On or Off Pumps.
We, THE HYDRAULIC ENGINEERING COMPANY LIMITED, of Charles Street, Chester,
and WILLIAM CARTER, Engineer, of 1, Hunter Street, Chester, do hereby declare
the nature of this invention and in what manner the same is to be performed, to
he particularly described and ascertained in and by the following statement:-
This invention relates to apparatus whereby the load is automatically thrown
on or off sets of pumps in a graduated manner so as to avoid shock to the electric
motors or engines which work them. For this purpose, the accumulator which
1s supplied by the pumps and which ascends and descends according as there is
less or greater demand for pressure water on the service, acts on tappets which
are connected by a loaded cord or chain to a rotating shaft or a sliding bar.
On the shaft there are cams one for each pump or on the sliding bar there
[Price 81

page_text: are sloped cam paths one for each pump, the cams being so set on the shaft or the
cam paths on the sliding bar that they come successively into operation to raise
and keep raised the suction valves of the pumps, allowing the water drawn in at
each stroke to pass back to the supply main. Thus as the accumulator rises
pump after pump is rendered ineffective for forcing water, and as the accumu-
lator descends, pump after pump is rendered effective. By thus automatically
throwing pump after pump out of or into operation the motor or engine which
works the set of pumps is relieved from the shock which would attend the stop-
page or the starting of all the pumps simultaneously.
Fig. 1 of the accompanying drawings is a front view and Fig. 2 is a transverse
section of the valves arranged according to this invention for throwing the loads
on and off a set of three pumps charging an accumulator.
Fig. 3 is a front view shewing a modification.
As shewn in Figs. 1 and 2 the suction branch E of each pump has a com-
munication with the discharge provided with a spring valve A against which
abuts the one end of a rod F the other end of which bears on a cam H fixed on
a shaft G. On this shaft are fixed pulleys B from which two cords C and D
lead, the one to the accumulator the other to a counterweight. The cams H being
set in different successive positions on the shaft G, when the accumulator rises
beyond a certain position the shaft G is caused to revolve first one of the cams H
raising the valve A above it and so relieving the load on one of the pumps by
permitting the discharge water to return to the suction; then a second of the
valves A is raised, and finally the third when the accumulator reaches its extremo
height. As the accumulator descends the shaft G is turned back allowing the
valves A successively to descend thus putting the pumps again in action.
As shewn in Fig. 3 a sliding bar J is connected by cords M N passing over
suitable guide pulleys, the one to the accumulator and the other to a counter-
weight. In this bar J are formed cam paths K L in which are engaged rollers
on the valve rods so that as the bar is caused to slide in the one direction the
pumps are successively relieved of load and as it slides in the opposite direction
they are successively brought into action again.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed we declare that what we claim
is:-
Automatic apparatus for throwing the load off or on pumps constructed and
operating substantially as described in reference to the drawings.
Hated this ad
L 1000
ABEL & IMRAY,
Agents for the Applicants.