Improvements in Steam Boilers.
Year: 1888

page_text: Date of Application, 27th Aug., 1888
Complete Specification Left, 6th June, 1889-Accepted, 27th Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
We MICHAEL FLÜRSCHEIM and THEODOR BERGMANN trading under the firm or
style of the "Eisenwerke Gaggenau" of the town of Gaggenau, Germany, Engineers,
do hereby declare the nature of our Invention to be as follows:-
This invention relates to a tubular boiler in combination with a single acting
engine which is provided with a peculiar safety valve and novel boiler mountings.
An intermediate chamber for the water and steam, surmounted by the dome, is
attached to the tube plate into which the water tubes are fastened.
The feed water heater with the socket of the funnel is placed above the water
tubes.
Suitable return pipes are inserted in the tubes which being fastened into a plate in
the above mentioned chamber effect a complete circulation of the water. A plate is
moreover inserted in the upper portion of the said chamber for the more effective
separation of water and steam.
The furnace is situated below and between the water tnbos. The feeding
magazines for the fuel extend the entire length of the boiler, so that the heat emitted
by the boiler is arrested by the fuel, which thereby becomes heated to a considerable
degree before its discharge upon the grate.
A slide in the front boiler shell affords free access to the furnace and the water
tubes from the outside. The heating, and the draft in the funnel respectively, are
automatically regulated by a safety valve in a valve box at the top of the dome, by
means of which a portion of the surplus steam escaping from the boiler at excessive
pressure, is admitted into the funnel, the steam being compelled into the contrary
direction to that of the escaping fire gases. The safety valve operating at the same
time as a fire regulator, is so constructed as to enable none but steam of very slight
pressure to enter the funnel, in order that when the valve is wide open, the smoke
gases may not be forced back through the grate.
To this end the valve box is provided with a lid of proper weight, which, when
raised, allows the surplus steam to escape as soon as the normal pressure of steam in
the valve box is exceeded. The valve is weighted by means of a forked lever action
with the weight outside the box.
In the event of previously existing safety valves on boilors in general a proper
sized valve of similar construction may be employed for controlling the draft.
In presence of the fact that with such valves all the steam blows against the
smoke draft, it is obvious that a comparatively small valve in proportion to the
safety valves prescribed by law will suffice to effect the necessary counter-draft in
the funnel.
Of course, the construction of such a valve is quite optional, while the loading
may be done with or without a lever or by means of a spring action.
The
steam pipe too may open direct into the fire tubes of the boiler or be transferred
to the ash pit, so that the escaping steam may act in opposition to the influx
of air.
A box is attached to the aforenamod boiler chamber, which is provided with
a float, into which a bit of tube is soldered or otherwise fastened, enabling
the float to move freely up and down, the vertical steam escape-pipe, and shuts off
the latter when the float is not buoyed up by the water in the boiler.
The float, therefore, enables steam to escape through the pipe whenever the water
in the boiler is too high.
This arrangement may be attached to any other steam boiler so as automatically to
controll the feeding of the boiler, because when the water is sufficiently high the

page_text: steam is conducted through the pipe between the valves of the feed pump, i.e.
directly below the pump piston or into the suction pipe, for as long as the steam
presses upon the suction valve of the pump, it is impossible for the latter to take up
water, this condition, however, ceases as soon as the float opens the steam escape.
The automatic. draft regulator (safety valve) thus described, may also be combined
in a common chamber with the float device for the automatic adjustment of the water
level, so that both attachments may form a single armature, and be more conveniently
fitted to the boiler.
"
The novelty in this steam engine, consists in the combination of the valve motion
with the feed pump, and the driving of the governor by means of a center crank.
The latter transfers the motion of the shaft to the pump by means of a cross head
slide which is cast in one piece with the pump piston, and is connected by a rod with
the distributing slide valve.
This slide operates between two guide plates which, with a lid, form a box. The
slide valve moves in the cylindrical valve box to which the governor valve is screwed
in which a piston shaped equilibrium slide of the customary sort is acted upon by the
governor.
The feed pump is connected with the attachment for the automatic adjustment of
the water level by means of a pipe and three way cock.
Dated this 27th day of August 1888.
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, W.C., Agent for Applicants.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
We, MICHAEL FLÜRSCHEMM and THEODOR BERGMANN, trading under the firm or
style of the "Eisenwerke Gaggenau of the Town of Gaggenau, Germany, do
hereby declare the nature of our said 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 a tubular boiler and a novel form of safety valve and
boiler mountings.
In the accompanying drawings Figure 1, sheet 1, represents a longitudinal sectional
elevation of the improved steam boiler.
Figure 2 represents a cross section through the boiler and furnace or combustion
chamber.
On sheet 1, Figure 1, A is the boiler-wall, into which are mounted the water tubes a.
To the wall A is screwed the frame B with cover b by which arrangement the box
shaped water and steam chamber is formed, upon which is situated the receiver or
steam dome C. Above the water tube a is mounted the feed water heater D and the
chimney or funnel E. Between and below the tubes a are situated the combustion,
chamber or furnace and the grate F.
In Figure 2, two chambers G and H are shown, through which passes the fresh air
in the direction of the arrows, so that the outer walls of the boiler are cooled, and
the warmed or heated air, which passes through holes or apertures above the grate,
effects a perfect consumption of the smoke.
In Figure 1, J is the feed box for the fuel, which is preparatorily heated by the
radiation of heat from the plate d. The fuel acts here as a bad conductor of heat to
oppose the radiation from the boiler, as the feed box covers the whole front wall of
the boiler. The draught in the chimney is automatically regulated by the safety
valve K, as when the pressure becomes too high the steam escaping through the
pipe e acts on the combustion gases and diminishes the draught, so that all surplus
production of steam will be prevented.
It is obvious that the construction of the safety valve may be varied according to
requirement; for instance, it may be constructed with a lover or spring; the discharge

page_text: of the steam pipe e may be also situated in the flue or in the ash-pit, so that the
discharging steam opposes the entering air.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, what we claim is:
1: In a steam generator partially enclosing the outside of furnace by a stock of
fuel, which is thereby preparatorily heated and forms, at the same time, a
bad conductor for the heat radiating from the boiler, substantially as and for the
purpose set forth in the foregoing specification, and illustrated on the accompanying
drawings.
2-In steam boilers, the application of the exhaust steam from safety valves for
the regulation of the draught, the steam being brought to act against the smoke gases,
thus diminishing the draught, whereby a surplus production of steam is prevented,
substantially as and for the purpose set forth and shown.
3: The arrangement of the feed water heater above the water tubes a thereby
serving as a cover to the furnace, so that tho feed water is partially heated by the
escaping smoke gases, substantially as and for the purpose set forth in the foregoing
specification, and shown in the accompanying drawings.
D
ليم
JT. 1880
5354
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, London, W.C., Agent for Applicants.