Pumping Load of a Cornish Pumping Engine.
Year: 1887

page_text: Date of Application, 27th Apr., 1887
Complete Left, 20th Dec., 1887
Complete Accepted, 27th Jan., 1888
Pumping Load of a Cornish Pumping Engine.
WC, ANNE HUSBAND of No. 25 Brandenburg Road Chiswick in the County of
Middlesex, JAMES HUSBAND Engineer of Bullwharf House Brentford in the County
of Middlesex and FRANK MORRIS Civil Engineer Brentford Lodge Brentford in
the County of Middlesex Executors of the late William Husband do hereby declare
the nature of this invention to be as follows:-
This invention relates to means of automatically adjusting the pumping load of
a Cornish pumping engine, that is to say rendering this load greater or less
according as there is greater or less pressure in the delivery main of the pump.
For this purpose an air compressing pump is provided which may be worked by
the engine, to compress air into an air vessel. From this vessel there is an
escape by a valve on which bears a piston loaded on its one side, but subjected
on its other side to the pressure in the delivery main of the pump acting in
opposition to the load. Thus as the pressure in the main rises or falls the load
on the escape valve is rendered less or greater, and consequently the pressure in
the air vessel is greater or less according as there is less or greater pressure in
the delivery main. The air vessel communicates with a cylinder the piston of
which is connected to the pump load either directly or to any convenient part of
the beam. This piston, at each descending stroke of the pump load has to
overcome the resistance of the compressed air and consequently encounters greater
resistance the less the pressure in the delivery main. By this counter resistance
the effect of the pump load is automatically rendered less, the less the pressure
in the delivery main, and greater the greater that pressure, which the pump load
has to overcome.
1 1920

page_text: Pumping Load of a Cornish Pumping Engine.
We ANNE HUSBAND of No. 25 Brandenburg Road, Chiswick in the County of
Middlesex JAMES HUSBAND Engineer of Bullwharf House Brentford in the County
of Middlesex, and FRANK MORRIS Civil Engineer Brentford Lodge Brentford in
the County of Middlesex, Executors of the late William Husband, 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 :-
This invention relates to means of automatically adjusting the pumping load of a
Cornish pumping engine, that is to say, rendering this load greater or less according
as there is greater or less pressure in the delivery main of the pump.
The
The accompanying drawing is an elevation partly in section shewing apparatus
according to this invention applied to the pump of a Cornish engine. A is the pump
having its plunger loaded by the weight L linked in the usual way to the end of the
beam B. Besides working the main water pump, the engine works also an air
compressing pump which may be, as indicated at C, worked directly from the main
plunger. Above the delivery valve d of this air pump is an escape valve e which is
pressed down on its seat by the stem of a piston p loaded by a weight w.
piston p works in a cylinder to which under the piston p there is communication by
pipe q from the water pump A or from its delivery main. The discharge of the
air pump C is led by a pipe F to an air vessel G which communicates by a passage
with the bottom of a cylinder H fitted with a piston K having its rod connected
directly to the load L of the main pump A. The operation of this apparatus is as
follows. According as the pressure in the delivery of the water pump A is greater
or less, this pressure communicated through the pipe 7 and acting on the piston p
overcomes more or less of the weight re and consequently determines a less or greater
load on the escape valve e, thus making the pressure of air in the pipe F and air
vessel G less the greater the pressure in the pump delivery, and greater the less that
pressure.
The piston K being subject to the pressure in G thus determined, relieves more of
the load L the less the pressure in the delivery main, and relieves less of the load L,
the greater the pressure in the delivery main. Thus the pump load L is automatically
adjusted to the pressure which it has to overcome.
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 :-
1. The herein described method of automatically adjusting the pumping load of a
Cornish pumping engine by connecting it to a piston subject to air pressure, which

page_text: pressure is determined by the action of a compressing pump provided with an escape
valve having a load on it more or less relieved by a piston subject to the water
pressure in the delivery main of the pump, substantially as described.
2. In combination with the pump of a Cornish pumping engine, an air compressing
pump with an escape valve loaded by a weight partly supported by a piston subject to
the pressure of water in the delivery main, and, in cominunication with the air pump,
a cylinder fitted with a piston which is connected to the main pump load and is
subject to the air pressure, arranged and operating substantially as and for the
purpose herein set forth.