Year: 1896

page_text: Date of Application (in United Kingdom), 19th Dec., 1896
Complete Specification Left, 17th Sept., 1897-Accepted, 23rd Oct., 1897
We, LA COMPAGNIE DE LA CHAUDIERE MIXTE of 28. Rue Saint Lazare, Paris,
France, represented by Louis Edmond Solignac Director, do hereby declare the
nature of this Invention to be as follows:-
This invention relates to an improved steam generator comprising:-
(1) A nest of tubes whereof the lower ones act as steam flashing tubes and are
supplied through reducing ferrules with water at a rate proportionate to their
vapourizing power from a water space in which a constant level is maintained,
said tubes being connected with an upper set of tubes which convey the steam to
the said water space;
(2) A steam and water chamber connected to said water space through a steam
pipe and valve controlled water passage in such manner that the level in the
water space is automatically maintained.
Reference is to be had to the accompanying drawings forming part of this
Specification which represent a vertical section of a boiler constructed in accordance
with the Invention.
a is a steam and water chamber, 6 ba nest of tubes heated by a furnace and
connected to the heads c d e is a tube rising from the head cand terminated
within the chamber a by a valve box f. A steam outlet tube y dips within the
head c to the level at which the water is to be constantly maintained, said tube g
opening to the steam space of chamber a. The lower tubes bare of relatively,
large diameter and are provided with reducing ferrules or nozzles h at their point
of connection with head c, the other set of tubes being of full bore throughout.
At starting the whole of the apparatus below the water level 12 is full of water
and when the tubes b, b1 are heated the steam produced in the middle of said
tubes will pass into both the heads c d and the tube e thus closing the valves f.
The steam can therefore only escape by driving out water through pipe g which
continues until the water level falls in c below the mouth of tube g, say to the
level 3 4. Thenceforth the water in the boiler will be separated into two masses
viz:-that contained in chamber a and that contained in tubes 6 and the heads
below the level 3 4, the water in tubes b will become converted into steam, and as
owing to the throttling by the reducing ferrules h the inlet of water is less than
the area of the tubes and than the area of the pipe 9 the tubes b, the head d,
and the upper part of head c, tube e, and valve box f, will be filled with steam.

page_text: The circulation is then established, the whole of the boiler beyond the reducing
ferrules being free of water and serving only for the passage of the steam.
If for any reason, such as excessive influx of water at the valves or the forcing
back of the water from tubes 6 into the head c, etc. the level of the water should
rise in c, the excess would be expelled through tube g by the steam pressure which
being unable to escape through 9 would close the valves f during the period of
suspension corresponding to the expulsion of the water.
It will thus be understood that the water level in head c will be automatically
maintained at 34 and so permit the supplying under a constant and regulated
pressure of tubes provided with reducing ferrules for preventing the flooding of
the tubes with non-vaporized water. The outlet and inlet tubes g and e may be
separate while the head may be replaced by any other connection between
tubes and b which may be made shaped for instance and connected by both
ends to heade the lower member acting as the vapourizer and the upper one for
conveying the steam away.
Dated this 19th day of December 1896.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
We, LA COMPAGNIE DE LA CHAUDIERE MIXTE of 28. Rue Saint Lazare, Paris,
France, represented by Louis Edmond Solignac Director, 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 steam generator comprising:-
(1) A nest of tubes whereof the lower ones act as steam flashing tubes and are
supplied through reducing ferrules with water at a rate proportionate to their
vapourizing power from a water space in which a constant level is maintained,
said tubes being connected with an upper set of tubes which convey the steam to
the said water space;
(2) A steam and water chamber connected to said water space through a steam
pipe and valve controlled water passage in such manner that the level in the
water space is automatically maintained.
Reference is to be had to the drawings accompanying our Provisional Specifi-
cation which represent a vertical section of a boiler constructed in accordance
with the Invention.
a is a steam and water chamber, bbl a nest of tubes heated by a furnace and
connected to the heads c d. e is a tube rising from the head c and terminated
within the chamber a by a valve box f. A steam outlet tube g dips within the
head c to the level at which the water is to be constantly maintained, said tube g
opening to the steam space of chamber a. The lower tubes bare of relatively
large diameter and are provided with reducing ferrules or nozzles h at their point
of connection with head c, the other set of tubes & being of full bore throughout.
At starting the whole of the apparatus below the water level 12 is full of water
and when the tubes b, bare heated the steam produced in the middle of said
tubes will pass into both the heads c d and the tube e thus closing the valves f
The steam can therefore only escape by driving out water through pipe g which
continues until the water level falls in c below the mouth of tube 9, say to the
level 34. Thenceforth the water in the boiler will be separated into two masses
viz that contained in chamber a and that contained in tubes b and the headse

page_text: below the level 3 4, the water in tubes b will become converted into steam, and as
owing to the throttling by the reducing ferrules h the inlet of water is less than
the area of the tubes band than the area of the pipe g; the tubes b, the head d,
and the upper part of head c, tube e, and valve box f, will be filled with steam.
The circulation is then established, the whole of the boiler beyond the reducing
ferrules being free of water and serving only for the passage of the steam.
If for any reason, such as excessive influx of water at the valves or the forcing
back of the water from tubes b into the head c, etc. the level of the water should
rise in c, the excess would be expelled through tube g by the steam pressure which
being unable to escape through g would close the valves f during the period
corresponding to the expulsion of the water.
It will thus be understood that the water level in head c will be automatically
maintained at 3 4 and so permit the supplying under a constant and regulated
pressure of tubes provided with reducing ferrules for preventing the flooding of
the tubes with non-vapourized water.
It will be evident that the forms, dimensions, and details of the various parts
constituting this improved boiler may be varied without departing from the
Invention which resides in the combination of the several elements operating in the
manner set forth. For example the outlet and inlet tubes 9 and e may be
separate while the head d may be replaced by any other connection between
tubes 6 and 6 which may be made -shaped for instance and connected by both
ends to head c the lower member acting as the vapourizer and the upper one for
conveying the steam away.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed we declare that what we
claim is:
A steam generator consisting of a lower set of steam generating, and an upper
set of steam conveying, tubes connected together at the one end (by a header or
wise) and both sets connected to the same header or chamber at the other end
the connection of the generating tubes with the water space of the header being
through constricted orifices whilst the return steam tubes are fully open to the
steam space of the header, and a water and steam reservoir at a higher level
connected with the header by steam ascension and water descension pipes, the
ascension pipe being open to the steam space of the reservoir and terminating
within the header at about the intended water level and the passage of water
through the descension pipe from the water space of the reservoir to the header
being controlled by automatic valves whereby a constant water level will be
maintained in the header substantially as specified.
Dated this 17th day of Santambor 1997
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.