Improvements in Boilers for Water Circulation Apparatus.
Year: 1889

page_text: Date of Application, 16th Oct., 1889
Complete Specification Left. 24th Jan. 1890-Accepted. 1st Mar.. 1890
PROVISIONAL SPECIFICATION.
Improvements in Boilers for Water Circulation Apparatus.
I FREDERIC LE POIDEVIN of La Porte, Catel, Guernsey, Fruit Grower, do hereby
declare the nature of this invention to be as follows:-
My invention relates to boilers of water circulation apparatus such as is used for
heating conservatories halls, chapels &c., and it has for its object to obtain a more
efficient circulation of the water than is obtained in other apparatus of the kind.
According to my invention I employ two independent saddle shaped boilers placed
the one within the other, the inner one being constructed of longitudinal water tubes
fixed at their ends in water casings while the outer one is a plain jacket enclosing the
inner tubulous boiler at a distance therefrom, both the inner and outer surfaces of the
jacket being available as heating surfaces, the jacket for this purpose being provided
with longitudinal external water webs and being so set in the external brickwork as
to afford a split return draft.
The front water casing of the inner boiler is U shaped to give access to the interior
which constitutes the fire space whilst the rear casing closes the end of the fire space
and only allows the products of combustion to escape from the space between the two
boilers after passing between the tubes of the inner boiler.
The two boilers have no direct communication but are connected by separate union
pieces with the flow and return pipes, so that the water circulation cannot be short
circuited through the two boilers the boilers acting independently to promote the
circulation through the whole system.
101
1000
COMPLETE SPECIFICATION.
Improvements in Boilers for Water Circulation Apparatus.
same is to be
I, FREDERIC LE POIDEVIN, of La Porte, Castel, Guernsey, Fruit Grower, do hereby
declare the nature of this invention and in what manner the
performed, to be particularly described and ascertained in and by the following
statement :--
My Invention relates to the boilers of water circulation apparatus used for heating
conservatories, halls, and other buildings or apartments; and it has for its object
to obtain a more efficient circulation of the water than is obtained in other apparatus
of the kind.
The Invention is illustrated in the accompanying drawings, forming part of this
specification and will be described with reference thereto; figure 1 being a perspective
view of the rear end, and figure 2 a similar view of the front end, of the improved
boiler, part of the latter figure being broken away to shew the construction.
According to my invention, I employ two independent saddle-shaped boilers A, B B¹, b,
placed the one within the other the inner one being constructed of longitudinal water
tubes 6 fixed at their ends in water casings B B¹ while the outer one is a plain jacket
enclosing the inner tubulous boiler at a distance therefrom.
The front water casing B of the inner boiler is a shaped chamber of cast or
wrought iron, the arched form of which gives access to the fire space comprised within
the set of water tubes; whilst the rear casing B¹ corresponds only in external form
and dimensions to the front casing, that is to say, it is not arched but closes the
rear end of the fire space.

page_text: The water tubes b are of round section and are fixed by their ends in the casing B B¹
in any suitable manner and they connect together the two casings and present an
extended heating surface to the fire. The fire space is closed at bottom by a set of
fire bars C which may be of the ordinary kind or tubular.
The outer boiler or jacket A is of cast or wrought iron and encloses the inner one,
as shewn, but at a sufficient distance therefrom to afford the necessary flue space
between the two, the products of combustion passing from the fire space between the
tubes to the space between the two boilers and thence through the space c between the
boiler A and the rear casing B¹ to the chimney, the corresponding space at the front
end being closed by the front of the stove.
The outer boiler A is so set in the external brick-work as to afford a split return
draught in the direction of the arrows, so as to make both the inner and outer walls
of the boiler available as heating surfaces, the jacket being for this purpose provided
with longitudinal external ribs a which may be hollow and communicate with the
water space and form water webs which increase the heating surface of the boiler.
The two boilers have no direct communication, as in other double boilers of the
same kind, but are quite independent being, however, connected at their front ends by
separate branch pipes or union pieces d'd' with the flow pipe D and by branch
pipes ee at the rear ends with the return pipe E of the circulation system, the
branches being so arranged that there will be no liability of the water circulation
being short circuited through the two boilers which act independently, to promote the
circulation of the water through the entire system.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I would observe that I lay
no claim to the use of a tubulous boiler within a non-tubulous boiler both of saddle
shape, but I declare that what I claim is ;
1st. In a double or combined tubulous and non-tubulous saddle boiler, as herein
described, the inner tubulous boiler having the rear end of the fire space closed so that
all the products of combustion must necessarily come in contact with the tubes and
with the inner surface of the outer boiler.
2nd. In a double or combined tubulous and non-tubulous saddle boiler whereof the
inner one is closed at the rear end, as described, the outer boiler provided with
longitudinal water-webs and external flues providing for a split return draught of the
products of combustion, so as to make both the inner and outer walls of the outer
boiler available as heating surfaces, as described.
3rd. The connection of an inner tubulous boiler and an outer non-tubulous boiler,
both being saddle shaped and constructed and arranged as described, with the same
flow and return pipes by means of branch pipes so arranged as to avoid short
circuiting of the circulation through the boilers, substantially as specified.
Dated thou
2
F. LE POIDEVIN.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
F. LE POIDEVIN.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.