Improvements in Condensing Gas Stoves.
Year: 1898

page_text: Date of Application, 2nd Aug., 1898-Accepted, 8th Oct., 1898
COMPLETE SPECIFICATION.
Improvements in Condensing Gas Stoves.
We, THOMAS FLETCHER and JOHN NEIL, Directors, and FLETCHER RUSSELL &
Co. LIMITED, of Thynne Street, Warrington, in the County of Lancaster, Manu-
facturers of Gas Apparatus, 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 the condensing gas stoves constructed to embody the improvements consti-
tuting our present invention the stove may be provided with a gas burner giving
a flat illuminating flame instead of with the argand burner or with the atmos-
pheric burner giving a circular or bunched flame at present commonly used.
Above the flame in the upcast tube there is arranged a throttle plate or equivalent
plate having an oblong or approximately oblong opening through it which prac-
tically corresponds in shape with the shape of the maximum cross section of the
flame and is arranged with its axis in the plane of the flame. This opening is
sufficiently large to allow the products of combustion to pass through it freely,
whilst it limits the induced current of air to such a quantity as will not interfere
with perfect condensation. The gases and vapours are thus caused to pass into
the condensing tubes without admixture with any surplus quantity of air, and
the heat carried by them is more easily yielded up and the vapours therein are
more perfectly condensed.
Instead of a single illuminating flame, as herein before described, a plurality
of illuminating flames may be employed, each with a correspondingly shaped
opening arranged above it.
Above the throttle or equivalent plate there may be arranged a tubular casing
closed at the bottom end and open at the top. The products of combustion
ascend between this casing and a surrounding casing or wall, and pass down-
wards through one or more condensing tubes. Each of these condensing tubes
is provided with an internal concentric tube which is open at the top and bottom
so that air may pass freely.
Within the tubular plate which is arranged above the throttle plate or its
equivalent, there is contained a second tubular casing which also is open at the
top and closed at the bottom. This casing is formed with perforations at a con-
venient point in its lower end so that air may descend within the casing and
ascend in a heated condition through the annular space between the two casings,
this annular space being also open to the atmosphere at the top. The air may,
of course, pass in the reverse direction.
It will be understood that a stove may be constructed with the flat illumi-
nating flame or flames and with the ordinary condensing tubes, or with the
tubular arrangement of condensing tubes herein before described and with argand
or atmospheric burners, or with the described tubular arrangement and with the
flat illuminating flame or flames.
The accompanying drawings, to which we will hereinafter refer, illustrate a
stove provided, with burners producing flat illuminating flames and with the

page_text: improved tubular system for heating, air and condensing the products of com-
bustion.
Figure 1 shews the stove in vertical section and Figure 2 represents it in hori-
zontal transverse section.
A A, indicate the burners for producing flat illuminating flames, four being
shewn although any other convenient number may be employed. B, is a
throttle plate arranged above the burners, or, it may be at the bottom of the
casing Ů. Suitable openings D are formed through this plate, one for each
flame, these openings approximating in shape with the cross sections of the
flames with which they are employed as illustrated by Figure 2, and being so
proportioned as to permit the free passage of the products of combustion whilst
limiting the induced current of air so that it will not interfere with perfect con-
densation.
Above the throttle plate is placed the tubular casing which is closed at its
lower end and open at its upper end to the atmosphere. Within this casing, is
arranged a second casing F', also open at its upper end and provided at or near
its lower end with perforations G. Air descends through the casing, passes
through the perforations and ascends in a heated condition between E and F, or
the reverse.
By
The products of combustion from the burners A pass through the openings in
the plate B and ascend the annular space between Cand E. Thence they pass
downwards through the condensing tubes H, each of which is provided with an
internal concentric tube J, open at the top and at the bottom to the air.
this arrangement a greater quantity of air is heated and condensation is facili-
tated. The condensed product falls into the lower part of the casing of the stove
and may escape through the opening K, falling into a suitable receptacle.
Any convenient number of condensing tubes may be employed. L, is a casing
which is suitably perforated and forms the top of the stove.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. In a condensing gas stove, the combination and arrangement with a burner.
or burners producing a flat illuminating flame or flames, of a throttle plate or
equivalent having an opening or openings therethrough corresponding with the
flame or flames, substantially as and for the purpose hereinbefore described with
reference to the accompanying drawings.
2. In a condensing gas stove, tubular casings for heating the air and con-
densing tubes provided with internal air tubes constructed and arranged sub-
stantially as herein before described with reference to the accompanying
drawings.
3. A condensing gas stove constructed and arranged substantially as hereinbe
fore described with reference to the accompanying drawings.
Dated this 30th day of July AD 1898
W. E HEYS & SON,
Agents for the Applicants.