Year: 1886

page_text: I, HENRY DAVEY of Rupert Lodge Headingley near Leeds in the County of
York, 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 :-
My invention relates to generators of steam for motor engines so arranged that
they require very little attention and are safer in unskilled hands than ordinary
steam boilers. They are, moreover, capable of storing the heat of the furnace
when power is not required, so that the fire may be kept continually burning
without any considerable waste of fuel, notwithstanding that the steam engine
may work only for a few hours.
In my Specification N° 1981 of 1885 I described a steam boiler having a vertical
fuel space holding sufficient fuel to serve for a considerable time, fuel having only
to be added at long intervals.
According to my present invention I use a similar space, but I construct the
boiler as I will describe referring to the accompanying drawings. Fig. 1 is a
vertical section and Fig. 2 a plan of a generator G according to my invention,
shewn, by way of illustration, as supplying an engine E to work a dynamo-electric
machine D. Fig. 3 is a vertical section shewing a modification of the generator.
Surrounding the fuel space a is a water space b, which communicates at the top
and bottom with a vessel c by passages d and e.
The water space b is of small capacity, as compared with that of the vessel o
which is of large capacity. The vessel c communicates with a feed vesself by a
pipe g having in it a check valve opening towards c. The feed vesself is supplied
with water by a ball cock or other suitable device. From the top of the vessel c,
a steam pipe h leads steam to the engine E. A branch pipe i provided with a stop
valve or cock, descends nearly to the bottom of the feed vessel f.
The generator G may be single, or there may be a number of the parts a and b
arranged side by side as shewn in Fig. 2, all communicating with a single vessel c.
The fuel space a, may be made of sufficient capacity to hold the fuel necessary
to evaporate the quantity of water contained in c, between certain levels such as k
and thus furnishing sufficient steam to drive the engine for the required number
of hours. The engine being started when the water level is at k, and the space a
is filled with fuel, then, at the end of the time of working the engine, the water

page_text: level may be lowered to 7. On stopping the engine, the valve or cock in the pipe i
is opened so that steam from c becomes condensed by the cold water in f, heating
that water, which after the condensation of the steam in c flows into c through the
pipe g. Thus c becomes again filled to k, with water which has stored up great
part of the heat carried by the steam from it to f. The fuel space a may be again
supplied with fuel and the fire may be kept continually burning, until it is again
required to work the engine, the heat resulting from the combustion of the fuel
being stored up in the water vessel c.
The rate of combustion in a may be regulated by means of a damper, the action
of which is rendered automatic in the following manner;
m is a vessel closed at the top, and communicating at the bottom w by a pipe n
with the boiler b. In m there is a float o which is attached by means of a rod,
passing through a stuffing box, to a lever that works the damper. As the upper
part of the vessel m contains air, while the lower part contains water, an increase
in the pressure of the steam in the boiler causes the water line in the vessel m to
rise, thereby raising the float and closing the damper. When the pressure in the
boiler decreases, the air in the upper part of m expands, causing the water line to
descend, thus lowering the float and opening the damper.
Instead of surrounding the fuel space a with a single water casing b it may have
a double casing 61 611 as shewn in Fig. 3.
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. A steam generator consisting of a vertical fuel space surrounded by a water
casing communicating by circulation passages with a comparatively large vessel
which holds a store of water and steam and is from time to time supplied from a
feed vessel, substantially as herein described.
2. In combination with a steam generator of the kind referred to in the preceding
claim, a vessel closed at the top communicating at the bottom with the generator
and containing a float connected to a damper, for automatically regulating the
combustion, substantially as herein described.
.נ.ו.ת
1000