Improvements in Compound Steam Engines.
Year: 1890

page_text: Date of Application, 31st Oct., 1890-Accepted, 20th Dec.,
1890
COMPLETE SPECIFICATION.
Improvements in Compound Steam Engines.
I JOHANN KLEIN, of Frankenthal, Germany, 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 :-
This invention relates to an improved expansion distributing slide valve motion
with steam chest filled with steam from the boiler for compound engines.
The invention is shown in the accompanying drawing upon which :-
Figure 1 is a longitudinal section of the two cylinders A and B arranged side by
side with the passages of the low pressure cylinder,
f
Figure 2 is a section of the slide box with the passages of the high pressure
cylinder,
Figure 3 is a section of the inlet and outlet passages on the lines ab in Figure 4,
Figure is a plan view of the slide surface,
Figure 5 is a view of the slide seen from below.
The steam inlet and outlet is effected in the two
slide valve o, arranged close to the large cylinder B.
two inlet and outlet passages p' and but there
pipe q³. As the slide valve o is arranged as close as
the passages q and q² of this cylinder are short, while the passages pland p² of the
small cylinder are very long.
cylinders A and B by one single
There are for the small cylinder
is no steam eduction (exhaust)
possible to the large cylinder B,
The Figures 1 to 3 of the accompanying drawing show the position and length of
the passages pl p² and g¹ q²..
The constructions shown in Figures 1 to 5 work as follows:-
Supposing the piston A' of the small cylinder A to be in the rear end position,
and the piston B, of the large cylinder B in the front end position. When the
piston A' owing to the admission of steam through the passage p' moves forward,
the steam having done work in front of the piston A' and the steam contained in the
passage p² and in the chamber passes into the passage q² and in consequence in
front of the piston B' of the large cylinder B.
The steam having done work behind the piston B' of the large cylinder B flows
through the hollow spaces of the slide o and from thence to the eduction (exhaust)
pipe q³.
The above described steam supply and steam exhaust is indicated in the figures by
arrows.
As before stated there is but one slide valve for the two cylinders; the slides are
cast in one piece and the passage of the steam from one slide to the other takes place
in the slide itself or in two separate passages and arranged in the slide. In the
small cylinder only the steam admission is to be regulated, whilst the escape of the
steam is coincident with the steam admission of the large cylinder and for this reason
there is only the steam admission in the part of the slide belonging to the large
cylinder which is to be regulated.
When the steam enters the small cylinder it flows in at two sides at the same time,
as indicated in Figure 2 by arrows.
The long inlet passages p' and p² for the small cylinder and the spaces r¹ and in
the slide form the chambers for the large cylinder, in which a determined quantity of
steam is measured, which then expands into the large cylinder.
The quantity of steam, which in Figure 1 arrives in front of the piston B¹ of the
large cylinder B and expands in consequence in the large cylinder, is composed of
the steam contained in cylinder A in front of the piston A', in passage p² and in the
space of the slide.
When the stroke changes, the long passage p¹ or p² of the small cylinder and the

page_text: space or belonging thereto are under the same pressure as in the small cylinder
itself and for this reason the initial tension of the large cylinder is equal to the final
tension of the small cylinder. When the stroke is terminated the steam of the long
passage or p² and of the space or bas expanded towards the large cylinder
and the latent pressure remaining in the same is not lost as at a fresh filling so much
less steam is necessary. The steam is completely utilised, as the passages of the
large cylinder are very short and the clearance in consequence very small.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what imanner the same is to be performed, I declare that what I
claim is :-
1. An expansion distributing slide valve motion for compound steam engines
having cylinders arranged side by side or one after the other, which slide valve
motion is characterised by the arrangement of a distributing slide valve o common to
the two cylinders A and B arranged in the slide box of the large cylinder B, whereby
the inlet and outlet-passages pl and p² of the small cylinder A become very long and
form thus with the chambers and steam chests, while the low pressure cylinder
has short passages, so that always one chest at the forward stroke of the piston in the
low pressure cylinder is filled with steam from the boiler and then shut off, in order
to make at the subsequent backward stroke of the piston its steam filling and that of
the corresponding side of the high pressure cylinder to expand directly by the agency
of the slide o into the opened low pressure cylinder and to perform work, substantially
as set forth and shown in the accompanying drawing.
2. The application of the separate connecting channels leading from the small slide
valve to the large one, whereby in the small slide valve only the admission of steam
is to be regulated and double inlet ports are obtained, substantially as set forth and
shown in the accompanying drawing.
Dated this Thirty-first day of October 1800.