of Combustion from Furnaces.
Year: 1885

page_text: of Combustion from Furnaces.
I, EDWARD FIELD, of Chandos Chambers, 22 Buckingham Street, Adelphi, in the
county of Middlesex, Consulting Engineer, do hereby declare the nature of said
invention for "IMPROVEMENTS IN ENGINES TO BE WORKED BY STEAM AND PRODUCTS
OF COMBUSTION FROM FURNACES to be as follows:-
"
This invention has for object the further development of the system set forth
in former specifications of myself and Harrison Aydon N° 2727 A.D. 1882 and
No 6382 A.D. 1884 of utilizing for the purpose of developing motive power
products of combustion from boiler or other furnaces such products being inixed
with steam.
According to my present invention the engine is provided with a slide jacket or
chamber (or chambers) of somewhat greater capacity than is usual, say from one-
third to three-fourths the capacity of the cylinder more or less according to the
pressure of the steam intended to be used. This slide jacket or chamber is caused
to be at, or a little before, the termination of each stroke of the piston filled with
products of combustion at a bigh temperature at atmospheric pressure or thereabout;
then steam is caused to be admitted into the jacket or chamber until the pressure
attained by the mixture therein is equal to that of the stean; the steam supply is
then shut off, and the contents of the jacket or chamber are allowed to flow into
the cylinder through a suitable distributing valve arrangement and to exert their
expansive force upon the piston at each side alternately or otherwise. The slide
jacket or chamber may either be exhausted so as to receive the products of
combustion, or the products of combustion may be forced in by a pressure above
that of the atmosphere.
W. LLOYD WISE,
Applicant's Agent.

page_text: of Combustion from Furnaces.
I, EDWARD FIELD, of Chandos Chambers, 22 Buckingham Street, Adelphi, in the
County of Middlesex, Consulting 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 has for object the further development of the system set forth
in former specifications of myself and Harrison Aydon No 2727 A.D. 1882 and
No. 6382 A.D. 1884, of utilizing for the purpose of developing motive power
products of combustion from boiler or other furnaces such products being mixed
with steam.
According to my present invention the engine is provided with a slide jacket or
chamber (or chambers) of somewhat greater capacity than is usual, say from one-
third to three fourths the capacity of the cylinder, more or less, according to the
pressure of the steam intended to be used. This slide jacket or chamber is caused
to be at, or a little before, the termination of each stroke of the piston filled with
products of combustion at a high temperature at atmospheric pressure or thereabout,
then steam is caused to be admitted into the jacket or chamber until the mixture
therein attains the required pressure, the steam supply is then shut off, and the
contents of the jacket or chamber are allowed to flow into the cylinder through
a suitable distributing valve arrangement and to exert their expansive force upon
the piston at each side alternately or otherwise. The slide jacket or chamber may
either be exhausted so as to receive the products of combustion, or the products of
combustion may be forced in by a pressure above that of the atmosphere.
Referring to the accompanying sheet of drawings, Fig. 1 is a plan partly in
section (the slide jacket cover being removed) and Fig. 2 a transverse section in
the line B. D of Fig. 1 illustrating an arrangement whereby my invention can be
carried into practical effect.
a is the working cylinder fitted in the usual manner with a piston and piston rod;
end covers etc. b is the slide jacket fitted with a double faced V slido valve c. c¹
and slide rod d for actuating the same. The V slide-valve (Fig. 1) is shewn in
section taken in the lines A d; d, c (Fig. 2). The face c¹ of the slide valve together
with the corresponding ports 1, 2, 3 in the cylinder face are in the example
illustrated arranged in manner resembling the valve arrangement of an ordinary
steam engine fitted with a short D slide. In the face c of the V slide valve are
formed two ports 4 and 5 open to the interior cavity of the jacket,
T
In the slide-jacket face against which the slide valve face c works are formed
two ports 6 and 7. These ports when uncovered by the slide valve face c establish
communications with the interior of the slide-jacket b as will be hereinafter
explained. It will be noted that with this valve arrangement whilst the face c' of
the D slide valve on the one face of the slide-jacket is doing its work in distributing
the motive fluid under pressure from the slide jacket b to each end of the cylinder
alternately and thence to the exhaust the other face c of the slide valve on the

page_text: adjacent face c of the jacket will whilst all communication is cnt off between the
jacket b and the cylinder, open and close the two ports 6 and 7 during only
the time that elapses between the closing of the port 1 and the opening of the
port 2 and vice versà; in other words the ports 6 and 7 or one of them will be open
only whilst 1 and 2 are closed; and 6 and 7 will be closed only whilst 1 or 2 is
open. e is a passage for filling the slide jacket b with heated products of
combustion or heated gases; f is the exhaust passage for changing the atmosphere
of the slide jacket at cach stroke of the piston and g is the exhaust outlet from the
cylinder. A small valve at h serves for the admission of high pressure steam into
the jacket b at the commencement of each stroke of the piston.
Fig. 3 illustrates in plan or top view the application of this invention to an
ordinary engine (a portion only of which is shewn) the slide and slide jacket being
especially adapted for the purposes of my invention.
a is the working cylinder; b is the slide jacket or chamber (there being in this
case only one) d is the slide-rod; e the pipe or passage for supplying hot products
of combustion to the slide-jacket; f the pipe or passage by which the slide jacket
is partially exhausted; g the exhaust-pipe from the cylinder a; h the small high
pressure steam-valve by which a small quantity of steam is admitted into the hot
products of combustion contained in the slide jacket a little before the termination
of each piston stroke. The above mentioned parts correspond to those similarly
lettered in Figs. 1 and 2. The supply of steam is shut off just before the opening
of the port
or 2 for each stroke of the engine. i is an air-pump or exhauster.
k a small chamber in connection with the pipe or passage f and the air-pump i; it
serves the purpose of moderating the extent of vacuum at the commencement of
motion of the air pump piston from each end of its cylinder.
This air pump instead of being driven direct by a rod as shown may be driven
from a separate crank; its time of action may then be altered and the chamber
dispensed with. m is a chamber wherein solid particles are separated from the
products of combustion. This chamber should be well "lagged" to prevent loss of
heat. n is a pipe by which the hot gases are conveyed from any suitable source
such as an uptake or furnace to the chamber m from which they pass by the
pipe e to the slide jacket b.
A self acting valve may be placed in the passage e to prevent any of the mixture
of steam and heated gases escaping therethrough.
The operation of an engine such as above described is as follows:-
For the purpose of starting, the piston of the engine should be placed at about
rd stroke, then the steam stop valve from the boiler should be opened and the
small steam admission valve h lifted for a few seconds whereupon the engine will
start. The valve may be then left to its own motion and the engine will continue
to work. The air pump or exhauster will first partially exhaust the small chamber k
producing a vacuum of say 5 lbs per square inch or less, and as this chamber is
connected with the port 7 in the slide jacket, by means of the pipe f; so soon as the
port 7 is opened by the slide valve a slight vacuum will be produced in the slide
jacket to the extent of say 24 lbs and on the port 6 being also opened by the
continued action of the slide hot gases or products of combustion will rush int
the slide jacket through the pipe e and fill that jacket at atmospheric pressure and
at a temperature of from 300° to 600° F. The valve will then be opened auto-
matically and by admitting a small quantity of steam will cause the pressure in
the jacket to immediately rise to the pressure required by the engine the duration
of lift of valve h being, when required, regulated by the governor. After the
necessary admission of steam the valve h will be closed automatically and the
D slide valve will then open one of the steam ports 1 or 2 (the ports 6 and 7 being
at this time closed), the contents of the jacket under high pressure will then expand
into the cylinder, until the steam port (1 or 2) is closed after which the mixture
will continne to expand in the cylinder during the opening of the ports 0 and 7 the
exhausting of the jacket and the recharging thereof with fresh hot gases or
products of combustion and so on.

page_text: As will be obvious engines may be constructed in various forms to operate on
the principle of my invention as above described and set forth in the following
claiming clauses.
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
1. Effecting in the slide or valve jacket or chamber (or jackets or chambers) of
an engine the mixture of hot gases or products of combustion with steam
substantially in the manner and for the purpose set forth above.
2. In an engine wherein mixture with steam of hot gases or products of
combustion is effected in the slide or valve jacket or chamber or jackets or chambers
effecting partial exhaustion of such jacket or chamber or jackets or chambers to
cause entrance of the hot gases or products of combustion by the use of an air
pump or exhauster substantially as described.
3. In an engine the use of apparatus substantially such as described and
illustrated for the purpose set forth.
Dated this 17th day of November 1885.
EDWARD FIELD.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.