Improvements in or connected with Steam Boilers.
Year: 1895

page_text: Date of Application, 22nd July, 1895
Complete Specification Left, 13th Aug., 1895-Accepted, 13th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in or connected with Steam Boilers.
1, JOHN BARKER SMITH, of James Mather Terrace, South Shields, Engineer, do
hereby declare the nature of this invention to be as follows :-
:―
My invention relates to improvements in or connected with steam boilers, and has
for its object a valve or nozzle that shall obtain a greater draught through the furnace,
than has hitherto been obtained; an improved bridge plate.
To effect this purpose, I construct the valve and casing thereof as the case may be,
of a tapered or conical form, so that steam passing it from the inside shall issue in
diverging instead of converging lines.
The valve may be situated when in use inside the entry tube or close to its
mouth.
Steam will be led to the valve chamber and when the valve is open, the steam will
issue all round the periphery of the tapered valve or casing in diverging directions,
so as to create great suction of air towards and through the air entry tube or tubes
and past the valve.
The valve spindle will be continued backwards, and fitted with a hand wheel to
work the spindle backward and forward in its screwed casing, thus the valve can be
adjusted to any required degree of opening, or it can be closed entirely.
The fittings consist of a cover or covers for the boiler ash pit fronts, which are
made preferably of cast iron with one, two, or more improved nozzles or valves, one
for each furnace, fixed inside cone hoods or covers which continue on the inside of
said cover or covers and which are used as air tubes, the said cover having a small
door-way in the centre, to enable the man in charge to clean out the dust which
passes through between the fire-bars. I may also use bridge plates of a new
design with a number of air holes passing up through the said bars, air being forced
through between the said bridge plate, and a division plate protected by brick work
on one side, the steam for the nozzles being conducted from the top of boiler with
steam piping (preferably iron), this piping being drained of water by a drain cock at
the bottom bend leaving the steam comparatively dry in passing through my improved
nozzle.
Dated this 22nd day of July 1895.
Improvements in or connected with Steam Boilers.
1, JOHN BARKER SMITH, of James Mather Terrace, South Shields, 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:
My invention consists of improvements in and connected with steam boilers, and
comprises a valve or nozzle that shall produce a greater forced draught through the

page_text: furnace than has hitherto been possible, without causing the ash-pit to become damp
or wet an improved design in bridge plates; and the fire bars as shown in
Figs. 10 and 11 Sheet 3 are preferred, these designs of fire-bars giving the best
results. According to my invention, I construct the valve and its casing of tapered
or conical form so that steam passing through same, shall issue in diverging, instead
of converging lines, as has been hitherto the case. The valve or nozzle is placed
when required for use within a conical hood in the ash pit cover, and the steam
issuing from it in diverging directions creates great suction of air towards and
through the air entry tube or tubes, i.e. through the hoods.
The valve spindle is continued through the casing and is fitted with a hand-wheel
or the like, for the purpose of opening or closing same, so that it can be opened or
closed to any desired extent..
The bridge plate used is of such a shape as to increase the draught.
The firebars are so arranged and constructed that they are always comparatively
cool, owing to the supply of air from the valve passing under them. In order that
my invention may be more clearly understood, I have hereto annexed three sheets of
drawings in which like letters of reference indicate corresponding parts in all the
figures.
Fig. 1 is a front view of the valve or nozzle, fitted ready to be fixed to the ash
pit covers.
Fig. 2 is side elevation of same, half in section.
Fig. 3 is a section of a boiler fire tube or flue shewing the several parts constructed
according to my invention in position.
Figs. 4 and 5 are an elevation and plan respectively of the bridge plate.
Fig. 6 is an elevation of improved door for cylindrical boilers.
Fig. 7 is an elevation of the ash-pit cover.
Fig. 8 being a section of same on the line A. B.
Fig. 9 is a view showing the hood of valve on ash pit cover in position.
Fig. 10 an elevational section of a firebar.
Fig. 11 being section of same on line C. D.
same.
Referring to Figs. 1 and 2, 1 is the valve shewn closed. 2 being the casing for
The valve is preferably a conical one having a conical seat as shewn. The
part 3 of the seat may be mitred, but is preferably rounded as shewn in Fig. 2.
The spindle 4 of the valve passes through the valve casing 2, having a screw
thread 5 fitting a corresponding thread in the casing aforesaid.
This spindle 4 has a hand-wheel or the like 6 attachad to same, for the purpose of
screwing up and unscrewing the valve, 1, thereby causing it to open or close as
may be required.
The valve may have either one or two inlet pipes 7, two being preferred, as the
valve is then more easily fixed in position in the hood 8, which is preferably of
the shape shewn in Fig. 1 and Fig. 2 namely a cone reversed as regards that of the
valve for the reason hereinafter explained. The portion 81 of the hood 8 may be
formed integral therewith, or may be bolted or otherwise fixed thereto.
Bolt holes 9 are provided in the flange for the purpose of bolting the whole to the
ash-pit cover 10, or any other method of fastening may be employed (Fig. 3).
Figs. 4 and 5 shew the improved bridge-plate 11. having therein a number of
holes 12, preferably 14 in number, for the purpose of increasing the draught, the
air sucked through by the valve passing through these holes and so forcing its way
between the bridge-plate and division plate 13, which may be protected by
brickwork or the like 14.
Fig. 6 shews an elevation of a door, for the fire tubes, being designed for the
purpose of preventing the escape of heat from the furnace, and consists of two
hinged flaps 15, one overlapping the other at 16 and having a bolt bar, or the like 17
to keep it in place.
The holes 18 provided in the ash-pit cover 10) are shewn in Figs. 7 and 8.
These are of such a size as will allow the portion 81 of the hood to pass through,
but too small to allow the flange of same to do likewise. A door way and

page_text: door 19 is provided in this ash-pit cover to allow the man in charge to clean away
the dust accumulation from the firebars 20, which are preferably of the shape shewn
in Figs. 10 and 11.
These firebars are kept cool or comparatively so, by the steam and air sucked in
by the nozzle coming in contact with them, thus causing them to be more durable
than otherwise would be the case.
Steam is admitted to the valve by piping (preferably iron) from the top of the
boiler. The tubes or piping may have a suitable tap or cock in it to drain the steam
of moisture, thus allowing the steam to pass through in a dry state.
In forced draught systems as hitherto practised, a great annoyance has been
caused by damp ash-pits. My improved system provides against this, by reason of
compressed air, coming in contact with rarefied steam, and causing a chemical
combination (by decomposition of the steam) thus preventing moisture being dropped
into the ash pit, as would under ordinary circumstances be the case when cold air.
comes in contact with steam.
The air is condensed, or compressed by passing through the conical hood
aforesaid.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :--
1. The improved valve or nozzle comprising a conical valve, 1 with casing 2 and
hand wheel 6, in combination with a hood 8 81 the whole specially designed for
producing a forced draught in boilers, all substantially as described and shewn with
reference to Figs. 1 and 2 of the accompanying drawings.
2. The improved construction of ash-pit covers, specially designed for admitting
a valve and hood substantially as hereinbefore described and shewn with reference
to Figs. 7, 8 and 9 of the accompanying drawings.
3. The improved bridge plate substantially as described and shewn with reference
to Figs. 4 and 5 of the accompanying drawings.
4. The improved door for use on flues to prevent escape of heat, substantially as
described and illustrated in Fig. 6 of the accompanying drawings.
5. The general construction, arrangement, and combination of apparatus sub-
stantially as herein before described, and for the purposes set forth.
Dated this 13th day of August 1895.
HUGHES & YOUNG,
23 Coleman Street, London, E.C., Agents for Applicant.