Improvements in or appertaining to Steam Generators.
Year: 1898

page_text: Date of Application, 15th Nov., 1898
Complete Specification Left, 14th Aug., 1899-Accepted, 7th Oct., 1899
PROVISIONAL SPECIFICATION.
Improvements in or appertaining to Steam Generators.
We, CHARLES GRAYSON, of 29, Ullet Road, and WILLIAM JAMES THOMPSON, of
129, Medlock Street, Kirkdale, both in Liverpool, in the County of Lancaster,
Ship Builder and Engineer respectively, do hereby declare the nature of this
invention to be as follows:-
This invention has for its object to improve the construction of steam
generators such as are described in the specification of a former patent granted
to us, viz. No. 26796 of 1896.
The principle upon which the generator which is the subject of the present
application, is similar to that mentioned but the body of the generator instead
of comprising a conical bottom and a vertical and cylindrical shell is composed
of two similar castings or halves bolted together by means of circumferential
flanges.
The shell when bolted up is in the form of a pair of cones placed base to base,
a vertical line joining their apices. In practice these cones may be somewhat
rounded so as to produce an egg shaped generator. The two halves may con-
veniently be made of malleable iron, or may be (in large sizes) built up of heavy
plate.
The end of the coil which enters the shell terminates in a spray or rose, or
annular jet, whose outflow is directed downwards so as to impinge upon the sides
of the lower cone a short distance above its apex, and this, we, find, finely divides
the steam and any water that enters the shell, and secures an even spread over
its heated interior surface. The jets of steam also have the effect of disturbing
and breaking up any condensed water that may lodge in the cone when first
heating the boiler, thus ensuring a more rapid generation of steam and a more
even utilization of the heated surface of the lower part of the shell..
The steam exit pipe "J" may also be fitted with a rose so that in the im-
probable case of priming the bubbles will be broken up and the steam will pass
through dryer than if a large free opening existed.
The last mentioned rose may be pointed or conical and so directed towards
the bottom of the generator as to meet and split up its contents. in case of ex-
cessive ebullition.
Dated this 14th day of November 1808

page_text: Ship Builder and Engineer respectively, 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 has for its object to improve the construction of steam
generators such as are described in the specification of a former patent granted
to us, viz., No. 26796 of 1896. The principle upon which the generator which
is the subject of the present application works, is similar to that mentioned in
our former specification.
In the Provisional Specification accompanying the present application for
patent we described the generator body as being composed of a pair of cones
placed base to base, but we find in practice that this construction does not give
such good results as when the upper portion is more elongated, and we therefore
show a generator, the shell whereof is of the latter shape. In some cases however
where economy of space is a consideration we construct the upper portion of our
generator of an exactly similar shape to the lower portion B (shown in the draw-
ings.) and superimposed thereon.
The drawing shows a vertical section of our improved generator.
The main body or shell A terminates in a conical bottom B. the two being
coupled together by means of flanges a, a strip of packing b being inserted between
them. The conical portion B is surrounded by a coil C, preferably of copper,
and the end thereof which enters the cone B terminates in a spray or annular
jet D whose outflow is directed downwards so as to impinge upon the sides of
the cone B a short distance above its apex, and this we find finely divides the
steam and any water that enters the shell and secures an even spread over its
heated interior surface. The jets of steam also have the effect of disturbing
and breaking un any condensed water that may lodge in the cone B when first
heating the device, thus ensuring a more rapid generation of steam and a more
even utilisation of the heated surface of the lower part of the shell. The steam
exit pipe J may also be fitted with a rose E so that in the improbable case of
priming, the bubbles will be broken up and the steam will pass through dryer
than if a large free opening existed. The rose E is pointed or conical as shown,
and so directed towards the bottom of the generator as to meet and split up its
contents in case of excessive cbbulition. F is a pressure gauge, and G a pipe
for the purpose of drawing off any water that mar lodge in the cone B. It is
provided with a pet cock II. I is the cock controlling the feed of water to the
coil C. and K is a sinuous coil of piping leading from the feed pump supplying
the water. The obiect of this coil K, which is composed of piping of considerably
smaller bore than the coil C. is to provide a body of cool water to act as a buffer
between the feed numin and the highly heated coils around the cone B. We
have found in practice that if the end of the coil C opens directly onto the pump,
steam is liable to pass back and cause the pump valves to fail. We make no
claim in respect of the coil K. L is a casing supported on legs M, and having
holes N for the exit of the furnace gases.
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:-
The improved steam generator substantially as described and shown.
Dated this 12th day of August 1899.
CHARLES COVENTRY,
Patent Expert,
Agent for the Applicants.