Improvements in Non-rotative Pumping Engines.
Year: 1892

page_text: Date of Application, 6th Feb., 1892
Complete Specification Left, 7th Nov., 1892-Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Non-rotative Pumping Engines.
I, RUDOLPH EMIL VON LENGERKE, of No. 1 Victoria Street, Westminster, in
the County of London, Civil Engineer, do hereby declare the nature of this
invention to be as follows:-
In non-rotative pumping engines, the steam valve is usually driven by a
subsidiary steam engine or by steam pressure acting on the valve or attachments
thereto.
My invention relates to means of working the valve or valves of such an engine
by a subsidiary engine, which may be a hydraulic or a compressed air engine
deriving its working fluid from the pump column or the air vessel.
The subsidiary engine having its valves worked by tappets is arranged and
regulated so as to determine the speed and pauses of the main engine.
In applying the invention to a simple or compound pumping engine, working
expansively with a variable cut off, the valve gear is arranged so as to vary the
cut off in accordance with the variation in the punp load. For this purpose the
main valve of the cylinder, which may be the high pressure cylinder of a cum-
pound engine, has on its back expansion or cut off plates, worked by the engine,
the distance between which can be adjusted if required. Or the point of cut off
may be determined by altering the position of the main valve which may be done
automatically by arranging the main valve to be moved by the subsidiary engine
against an increasing resistance such as that of a spring or a steam or air cushion.
Thus, when the pump load increases, the subsidiary engine by farther compressing
the spring moves the main valve further causing a later cut off.
On the other hand when the pump load is less, an earlier cut off will take place.
By using, instead of a spring, a cushion of boiler steam, the engine will adapt
itself to variation of the steam pressure.
The main engine may have only its admission valves worked by the subsidiary
engine, separate exhaust valves being arranged to give effective cushioning.
Dated this 6th day of February 1892.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Non-rotative Pumping Engines.
I, RUDOLPH EMIL VON LENGERKE, of No. 1 Victoria Street, Westminster, in
the County of London, Civil 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 :-
In non-rotative pumping engines, the steam valve is usually driven by a
subsidiary steam engine or by steam pressure acting on the valve or attachments
thereto.
My invention relates to means of working the valve or valves of such an engine
by a subsidiary engine, which may be a hydraulic or a compressed air engine
deriving its working fluid from the pump column or the air vessel.
The subsidiary engine having its valves worked by tappets is arranged and
regulated so as to determine the speed and pauses of the main engine.
In applying the invention to a simple or compound pumping engine, working
[Price 8d.]

page_text: expansively with a variable cut off, the valve gear is arranged so as to vary the
cut off in accordance with the variation in the pump load. For this purpose the
main valve of the cylinder, which may be the high pressure cylinder of a com-
pound engine, has on its back expansion or cut off plates, worked by the engine,
the distance between which can be adjusted if required. Or the point of cut off
may be determined by altering the position of the main valve which may be done
automatically by arranging the main valve to be moved by the subsidiary engine
against an increasing resistance such as that of a spring or a steam or air cushion.
Thus, when the pump load increases, the subsidiary engine by farther compressing
the spring moves the main valve further causing a later cut off.
On the other hand when the pump load is less, an earlier cut off will take place.
By using, instead of a spring, a cushion of boiler steam, the engine will adapt
itself to variation of the steam pressure.
The accompanying drawings illustrate my invention applied to a pumping engine
having a single cylinder.
Fig. 1 is a longitudinal section.
Fig. 2 is an end view partly in section.
Fig. 3 is a side view of the hydraulic subsidiary cylinder and
Fig. 4 is a sectional plan of the same, shewing also the connections for working
the expansion valve.
The main slide valve A is directly connected to the piston of the hydraulic
cylinder B, the rod of which is extended, and passed through a spring box C.
Tappets on the rod act on stop plates or washers at each end of the spring so that
as the piston of B makes its stroke it has to encounter resistance of the spring
which increases as the piston advances in either direction. This resistance may be
adjusted by more or less compressing the spring by screwing more or less inwards
the cap D of the cylinder C. The slide valve Ĕ of the hydraulic cylinder B is
moved to and fro by tappet levers F acting on the ends of the slide rod. These
levers are moved by an arm G acting between adjustable tappets on a rod
connecting the levers F, this arm G, being on a rocking shaft worked by a
lever H, which slides in a sleeve jointed to the crosshead K of the main piston.
This lever H, besides having an arm to work the slide valve of the subsidiary
cylinder B as above described, is also connected as shewn in Fig. 4 to the rod Ĺ
of the expansion plates which slide on the back of the main valve A, these plates
being attached to their rod by right and left screws so that, by turning the rod, they
can be adjusted nearer to or farther from each other.
The valve chest of B is supplied by the pipe M from the pump main, so that the
force acting on the piston of B is approximately proportional to the pump-load,
and the stroke of the main valve A made in opposition to the spring in C is greater
or less giving a supply of steam during a greater or less portion of the engine
stroke according as the load is greater or less.
Obviously, for the spring in C might be substituted a cushion, of steam or
compressed air.
In the pipe N, by which the exhaust from the cylinder B is discharged, is provided
a cock or valve by which the discharge can be more or less throttled, so as to
regulate the speed with which the piston of B makes its stroke, and thus determine
a greater or less pause at the end of each stroke of the engine.
Although I have shewn in the drawings my invention applied to an engine
having only a single cylinder, obviously, by suitable modifications; such for instance
as extending the valve rod, the valve of a second cylinder of either a twin or a
compound tandem engine might also he worked from the subsidiary cylinder B.
Instead of employing water from the pump main as working fluid in the
cylinder B compressed air drawn from the air vessel of the pump, and consequently
having substantially the same pressure, might be used for this purpose.
I prefer however to employ the water as above described, in order to avoid the
necessity for employing an air compressing pump to charge the air vessel in order
to make up for the air taken from it.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I would have it under-
stood that I make no general claim to working the slide valve of a pumping engine
by the piston of a subsidiary cylinder which has its valves worked from the engine
crosshead, but what I claim is :-
1. The herein described method of working the slide valves of non-rotative
pumping engines by the pistons of subsidiary cylinders moved by fluid subject to
the pressure in the pump main against springs or other resistances increasing
throughout each stroke.
2. In a non-rotative pumping engine, in combination with the slide valve, a
subsidiary cylinder and piston having its slide valve worked from the engine cross-
head, having its piston rods provided with tappets to meet an adjustable spring or
its equivalent, having its supply connected with the pump main, and having its
discharge provided with a regulating cock or valve, substantially as and for the
purpose set forth.
Dated this 7th day of November 1892
ABEL & IMRAY,
Agents for the Applicant.