COMPRESSING PUMPS FOR GAS MOTOR ENGINES
Year: 1884

page_text: I, HENRY PERCY HOLT of Openshaw Manchester in the County of Lancaster,
Engineer do hereby declare the nature of my said Invention for " COMPRESSING
PUMPS FOR GAS MOTOR ENGINES" to be as follows:-
"
In certain kinds of gas motor engines, pumps are employed to deliver the charges
of air and gas for working the engines, but the use of such pumps is attended with
difficulties in respect of the time, order and proportion of their respective charges,
thus interfering with the governing of the engine. This invention relates to means
of overcoming these difficulties in the following manner. In a space or passage
in communication with the air pump is placed a collapsible vessel such as a bag
or bellows; or it may be a cylinder fitted with a piston or flexible diaphragm,
constituting the gas pump which is provided with suitable suction and discharge
valves. When the air pump draws in air, this vessel dilates drawing into itself a
charge of gas, and when the pump compresses the air for discharging, the pressure
of the air acting on this vessel causes it to collapse, discharging the gas, which is
thus kept separate from the air, until they mix in the working cylinder or in the
passage thereto.
By throttling somewhat the air discharge, the full delivery of gas from the vessel
may be ensured. The quantity of gas is controlled by the governor acting on the
valves of the vessel, this action being so timed that air is first discharged and finally
air and gas in suitable proportions for combustion. When the gas pump is arranged
as above mentioned, as a cylinder with what may be termed a floating piston, that
is to say a piston not mechanically connected to the engine but moving in obedience
to the pressure of the air on one side of it and of the gas on the other side, it may
be provided with air or spring cushions to prevent it from striking the ends of the
cylinder, and the area of its side exposed to the air pressure may be made greater
than the other to ensure delivery of the gas.
Dated this 25th day of February 1884.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C..

page_text: I, HENRY PERCY HOLT of Openshaw, Manchester in the county of Lancaster,
Engineer, do hereby declare the nature of my invention for "COMPRESSING PUMPS
FOR GAS MOTOR ENGINES and in what manner the same is to be performed to
be particularly described and ascertained in and by the following statement:-
"
In certain kinds of gas motor engines, pumps are employed to deliver the charges
of air and gas for working the engines, but the use of such pumps is attended with
difficulties in respect of the time, order and proportion of their respective charges,
thus interfering with the governing of the engine. This invention relates to means
of overcoming these difficulties in the following manner. In a space or passage in
communication with the air pump is placed a .collapsible vessel such as a bag or
bellows; or it may be a cylinder fitted with a piston or flexible diaphragm,
constituting the gas pump which is provided with suitable suction and discharge
valves. When the air pump draws in air, this vessel dilates drawing into itself a
charge of gas, and when the pump compresses the air for discharging, the pressure
of the air, acting on this vessel, causes it to collapse, discharging the gas, until they
mix in the working cylinder or in the passage thereto.
By throttling somewhat the air discharge, the full delivery of gas from the vessel
may be ensured. The quantity of gas is controlled by the governor acting on the
valves of the vessel, this action being so timed that air is first discharged and finally
air and gas in suitable proportions for combustion. When the gas pump is
arranged, as above mentioned, as a cylinder with what may be termed a floating
piston, that is to say, a piston not mechanically connected to the engine but
moving in obedience to the pressure of the air on one side of it and of the gas on
the other side, it may be provided with air or spring cushions to prevent it from
striking the ends of the cylinder, and the area of its side exposed to the air pressure
may be made greater than the other, to ensure delivery of the gas.
Fig. 1 of the accompanying drawings is a longitudinal section and fig. 2 is a
transverse section of a combined air and gas pump, according to my invention, for
charging the cylinder of a gas motor engine, the gas space of the pump being
separated from the air space by a flexible diaphragm; fig. 3 is a longitudinal
section and fig., 4 an end elevation shewing the modified arrangement in which a
differential piston is employed instead of the diaphragm. Referring to figs. 1 and 2,
the gas supply pipe 1, communicates by the suction valve 2 and branch pipe 3 with
the space 4 behind the flexible diaphragm 12 at the end of the air pump 9. As
the piston 10, makes its outstroke drawing in air by the auction valve 7, gas enters
behind the diaphragm 12, expanding it; and, when the piston 10 makes its instroke
discharging the air by the delivery valve 8 into the engine cylinder 11, the pressure
in the pump acting on the diaphragm forces gas through the pipe 5 and gas delivery
valve 6 to a passage surrounding the seating of the air delivery valve 8, whence it
issues by a number of holes, so as to mingle with the air entering the cylinder 11.
The valve 6 may, as shewn, be kept closed by a spring, except when it is opened
by the engine in obedience to the action of the governor, according to the arrange-
ment adopted in many gas motor engines. The mouth of the air passage 13 may
be arranged so as to be partially closed by the piston 10 as it approaches the end
of its instroke, or the area of the passage leading to the valve 8 may be more or
less throttled so as to cause increased pressure of air in the pump 9 and thus
ensure delivery of the gas charge. Figs 3 and 4 shew only the inodification of the
arrangement shewn in figs. 1 and 2 by the substitution of the annular piston 14

page_text: for the diaphragm 12, this piston presenting a larger area on the side exposed to
the pressure in the pump 9 than on the side presented towards the gas space 4 of
which as before the inlet is 3 and the outlet 5. Holes 15 are provided for free
passage of air to and from the annular space surrounding the piston 14. When the
delivery of air from the pump is throttled as above mentioned, the piston 14. need
not be made differential.
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:
.
For delivering charges of air and gas into the cylinder of a gas motor engine, the
use of a pump in which there is a gas space separated from an air space by a
flexible diaphragm or a floating piston, arranged to operate substantially as herein
described.
Dated this 24th day of November 1884.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.