An Improved Smoke Consuming, Forced Draught, and Noise Dispelling Apparatus for Steam Boilers and Furnaces.
Year: 1898

page_text: Date of Application, 26th Aug., 1898
Complete Specification Left, 26th June, 1899-Accepted, 29th July, 1899
An Improved Smoke Consuming, Forced Draught, and Noise Dispelling
Apparatus for Steam Boilers and Furnaces.
I, GEORGE GREGORY, of 23, Brooksby Street, Liverpool Road, Islington,
in the County of Middlesex, Engineers, Pattern and Model Maker, do hereby
declare the nature of this invention to be as follows:
My invention relates to an improved apparatus for creating forced draught,
and also the consumtion of smoke, by induced currents by a more reliable method;
and dispelling the noise caused thereby. In carrying out my invention I employ
a bell mouthed metal tube, which I fix through the furnace front preferably
above the fire; I then fix into the centre of the said metal tube an adjustable
bell mouthed nozzle: so constructed as to emit a fine circular jet of steam which
I admit into the said nozzle by a small pipe leading from the top of the boiler;
the nozzle is so formed to allow the air to be induced through the centre and
thereby increase the velocity of air through the bell mouthed tube, I also attach
to the bell mouthed end of the tube, a mettalic cover, or lid, so constructed as to.
receive a number of dics of wire gauze, perforated metal, or any other suitable
material, seperated and held a distance apart from each other by spacing peices,
the whole will be fastened togather by bolts or other suitable means.
The construction of this cover or lid, has the effect of dispelling the noise
caused by the inrush of air which is induced by the adjustable nozzle under
steam pressure.
Dated this 26th day of August 1898.
An Improved Smoke Consuming, Forced Draught, and Noise Dispelling
Apparatus for Steam Boilers and Furnaces.
I, GEORGE GREGORY, of 23, Brooksby Street, Liverpool Road, Islington,
in the County of Middlesex, Engineer, Pattern and Model Maker, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
My invention relates to smoke consuming and forced draught producing
apparatus of the kind described in the Specification of former Letters Patent
No. 3988 of 1893 granted to Robert Gregory, the object of the present invention
being to increase the efficiency of such apparatus and at the same time to minimize
or reduce the noise produced during the operation of the same.
In carrying out my invention I employ a bell mouthed tube as described in the
specification before referred to and I also arrange a nozzle within the said tube
for inducing the draught, but according to my invention I so construct the said
nozzle as to emit a fine circular jet of steam so that a current of air is induced
רס..'.

page_text: not only around the nozzle but through the same whereby the velocity of the
air current is increased.
In order to permit of ready access to this nozzle the rear end of the bell mouthed
tube is made open immediately behind the said nozzle and this opening is advan-
tageously covered with one or several sheets of wire gauze which are carried in
a ring capable of being turned back when access is to be had to the nozzle, the
said sheet or sheets of gauze serving to reduce the noise produced by the apparatus.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which:
Figure 1 is a vertical sectional elevation shewing my improved apparatus;
and
Figure 2 is a sectional plan of part of the same:
Figure 3 is an elevation of part of the apparatus:
Figure 4 is a sectional view of the draught inducing nozzle drawn to a larger
scale than Figures 1 and 2.
a is the bell-mouthed tube which is inserted through the furnace front in any
desirable position and which, as shewn, is provided at the front end with a
spreader for distributing the air over the surface of the fuel, but which may,
if desired, be used without such spreader.
c is the nozzle which is arranged in the bell-mouthed tube and which is supplied
with steam from the boiler through a pipe d provided with a regulating valve e.
The nozzle c is formed of an outer casing f which is connected with the steam
pipe and of a funnel g screwed into its rear end the front or small end of which
funnel is adapted to enter an opening h in the front end of the casing f and is
made slightly tapering so that by moving the said funnel in or out relatively
with the casing the ring shaped aperture between the casing and the funnel
through which the steam escapes can be diminished or increased according to
requirements.
It will be understood that the circular jet of steam which escapes through the
said annular space will induce a current of air not only around the outside of
the nozzle but also through the funnel.
is the ring which carries a series of pieces of wire gauze j, j, the said pieces
of gauze being separated by distance pieces k, k. This ring is pivoted at 1 to a
lug on one side of the bell-mouthed tube a and is on the other side provided with
a hook m adapted to engage with a pin n on the said bell-mouthed tube, this
arrangement permitting of readily turning back the ring with the gauze, for
instance, to the position indicated by the dotted lines in Figure 3, when access
is to be had to the nozzle for the purpose of adjusting the same. When the
sheets of gauze are in position over the bell-mouthed tube they tend to reduce
the noise produced by the steam jet.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. The combination with a bell-mouthed tube extending through a furnace front
of a nozzle having a central air passage and adapted to emit a ring shaped jet
of steam around the said passage so as to induce a current of air through the
passage and also around the nozzle, the said passage being adjustable relatively
with the casing of the nozzle, all substantially as, and for the purpose, described.
2. The improved smoke consuming and forced draught producing apparatus
herein before described and illustrated in the accompanying drawing.
Dated this 26th day of June 1899
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.