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:-
In Specifications No 3833 and 15,185 of 1884, No 1981 of 1885 and No 2930
of 1886, I have described various forms of steam motors specially designed to
ensure safety against explosion, and to require comparatively little attention.
Such motors, whilst they are useful for general purposes, are specially applicable
in private houses for electric lighting and for working domestic machinery:
My present invention relates to a simple and compact construction of motor
suitable for the purposes above indicated and to arrangements for safety and for
regulating pressure and providing feed, which are applicable to the motor about to
be described, and also to motors such as are described in the Specifications above
referred to as well as to motors of other kinds. Fig. 1 of the accompanying
drawings is a vertical section of a steam motor according to my present invention
and Fig. 2 is a side elevation of the same shewing in section the feed and circu-
lating pump and the pressure and feed apparatus.
Referring to Fig. 1, the boiler A has within it two fuel spaces V V₁ separated by.
two mid-feathers forming water spaces and a flue Z between them. The fuel spaces
being charged through removeable covers at the top, and kindled at the bottom,
the combustion goes on for many hours without requiring attention or fresh, stoking,
Obviously the number of mid-feathers and flues such as Z may be varied. The
engine, which is all contained within a casing B, is single acting, the steam from
the boiler being, by means of the partly rotating valve C adimitted above the
piston T, and the exhaust passing by the channel V down to the surface con-
denser W. The connecting rod and crank are within the casing B, the shaft U
passing through stuffing boxes in the sides of B. The space under the piston T
communicates with the condenser by a hole X opening into the channel V, and by
a small siphon pipe D by which water of condensation is drained off, the oil
floating over it being from time to time run off by a cock d. A drain pipe E leads
back to the boiler water of condensation or priming. Referring next to Fig. 2,
I make the plunger O, which is worked by a crank or eccentric from the engine
shaft U, differential, so that the part below O acts as an air pump withdrawing
air and water from the surface condenser. W by a pipe w and discharging into a
دماند

page_text: vessel F, while the annular space above the plunger O acts as a pump drawing
water by a supply pipe o, discharging it by a pipe p into the space around the
tubes of the surface condenser, whence the water passes by a pipe q to a stand
pipe or column G. The vessel F communicates by an upper and a lower hole with
the stand pipe G. By the lower hole water is admitted to F when the supply from
the air pump is insufficient; the upper hole allows air to escape through the water
in G and through.a pipe H which may be carried to such height as is necessary to
suit the pressure desired in the boiler. The safety valve S is loaded simply by the
pressure of the water column above it. As this column is always less than that
in the vessel F which is at a lower level, and as the feed water is supplied to the
boiler from F by the float feed valve at K, the pressure urging the feed water into
the boiler is always greater than the pressure within the boiler which is determined
by the load on the safety valve. The pressure maintained in the column G is
determined by the height of the pipe H by which the water may be discharged, or
when it is discharged by a pipe M, the pressure may be determined in the following
manner. A float L in a vessel containing mercury is formed as a valve to close
the mouth of the pipe M leading from the upper part of the stand pipe G.
Obviously, the higher the level of the mercury, the greater is the force with which
the valve L closes the pipe M, and therefore the pressure in G may be determined
by adjusting the level of the mercury. In order to make the pressure in the
column G vary with that in the boiler, I may connect with the vessel containing
the float L another vessel N, which communicates by a pipe n with the steam
space of the boiler. Thus, according as the pressure is greater or less in the boiler,
the level of the mercury in N is lowered or raised, and the float valve L is thus
pressed upwards with more or less force to close the pipe M, and to maintain
a greater or less pressure in the column G.
:
Although I have shewn the air and circulating pump, and the arrangements for
determining the boiler pressure and feed as applied to a motor engine such as is
shewn in Fig. 1, obviously these devices which are shewn in section in Fig. 2, could
be applied to motors of the forms described in my previous Specifications and
generally to similar motors.
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, in respect of Steam Motors, is,
'
1. The construction of boiler with its fuel and water spaces and flues in com-
bination with single acting engine and condenser, substantially as herein described
with reference to Fig. 1.
2. Loading the safety valve with a water column communicating at a lower level
with the boiler feed so that the pressure for feeding always exceeds the steam
pressure in the boiler, substantially as described.
3. For regulating the pressure of the water column referred to in the preceding
claim, the use of mercury float apparatus constructed and operating substantially
as described.
4. In combination with, the feed valve K and its casing, the vessel F supplied
from air pump discharge and communicating with the pressure column G, as, and
for the purposes set forth.