Improvements in Steam Boilers.
Year: 1898

page_text: Date of Application, 29th June, 1898-Accepted, 20th Aug., 1898
Improvements in Steam Boilers.
I, GEORGE NAPIER BERWICK, of 27, Windsor Terrace, South Shields, Gentleman,
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 improvements in steam boilers, the object being to
provide means for automatically creating a circulation in wet bottomed cylindrical,
multitubular and return flue boilers, the means employed to this end being simple
and effective, causing the boiler to heat equally all over, while the circulation of the
water commences as soon as the fires in the boiler are lighted and continues as long
as there is any fire in the furnace, and by this means there is no unequal expansion
of the shell plates due to the difference in temperature of the water at various
parts of the boiler, which frequently occurs with boilers of ordinary construction,
causing the bottom seams of the boiler to leak.
The essential feature of this invention consists in the arrangement of a tube or
tubes across or through the combustion chamber through which the water circu-
lates owing to its being heated and consequently rising drawing a further supply
of water through the same. The extremity of the said tube or tubes may be fitted
with extensions or leading tubes for collecting the water which is to pass through
the tube or tubes within the combustion chamber, from any required part of said
boiler, or for directing the current or flow of the water.
In order that my invention may be more fully understood, I will now proceed
to describe the same by referring to the accompanying drawings in which Figs. 1,
2, 3 and 4, are sectional views and Fig. 5 a plan view illustrating the application
of this invention to steam boilers. Fig. 6 is a sectional detail view showing the
method securing the upper end of the tube to a combustion chamber having a
half round top. Fig. 7 is a sectional detail view showing the method of securing
the lower end of the tube and Fig. 8 is a plan of the same.
According to this invention a tube a is arranged within the combustion chamber
in such a manner that the water is heated and consequently rises or circulates
through the same. In the case of the combustion chamber top being flat the upper
end b of the tube is just expanded in the said plate in the ordinary manner of
securing boiler tubes (Fig. 2), while the lower end c may be screwed into and
expanded in the flange d or just screwed into the same with a check nut and joint.
or any other suitable means for securing the pipe in position may be emploved.
In cases where the top of the combustion chamber is half round (Figs. 4 and 6),
the end 6 of the tube a passes through the same and is expanded in a suitable
bracket piece f which may be secured in position in any convenient manner.
A separate flange or fitting g (Figs. 7 and 8) may also be provided where the
bottom of the combustion chamber is semi-circular. This is rivetted or otherwise
secured to the bottom hand into it the lower extremity c of the tube a is expanded
or screwed.
The extremity of the tube or tubes a may be provided with any suitable extend-

page_text: ing tubes m to collect the water from any required part of the boiler and to direct
the current or flow of water (Figs. 3, 4 and 5).
Although in the drawings only one tube is shown as fitted within the combustion
chamber, yet it is obvious that two or more may be employed, while this invention
may be applied to boilers of all kinds where its use is attended with advantageous
results.
The bottom seams of boilers fitted with this system of circulation will not be
strained by unequal expansion of the shell plates, and therefore it is rendered
possible for them to be kept water-tight.
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 means for causing an automatic circulation in steam boilers,
substantially as described and shown with reference to the accompanying
drawings.
2. In steam boilers, the arrangement of a tube or tubes within the combustion
chamber with or without extending tubes or connections, substantially as described
and shown, and for the purposes specified.
F. G. CASSELL,
(Of Cassell & Co.,)
22, Glasshouse Street, Regent Street, London, W.,
Agent for the Applicant.
OCOT
CTTTA UZE