Improvements in Steam Generators
Year: 1897

page_text: Date of Application, 11th Nov., 1897-Accepted, 18th Dec., 1897
COME JULIE DI MUIT TUATION.
"Improvements in Steam Generators."
I, DAVID MACDONALD, of 7 White Street, Partick, Glasgow, Chief Clerk, 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 the construction of an improved steam generator
combining the advantage of a water tube boiler and a fire tube boiler.
And in order that my invention may be properly understood I have hereunto
appended two explanatory sheets of drawings which show, by way of example, a marine
boiler constructed in accordance with my invention.
On the drawings
Fig 1 is a longitudinal section of the boiler.
Fig 2 is an end view of the same the smoke box and funnel being removed.
Fig 3 is a vertical section taken on the line x-x of fig 1.
Fig 4 is a sectional plan to an enlarged scale taken on the line y-y of fig 1.
The details of construction of the boiler are the same as at present and are therefore
not shown on the drawings.
The boiler is constructed in three parts, a steam chamber a, a fire tube boiler b
and an intermediate water-tube space c.
As will be seen the tubular boiler b forming the base of the generator is of the
usual construction and is provided with a corrugated or other well known form of
furnace d. The top of the boiler is flattened and secured to it are a number of
flanged water tubes f. f are the flanges. As shown clearly at fig 4 these water tubes
are arranged in rows the tubes of one row being opposite the intervals in the
next row.
The space c is boxed in at each side by plates g but is left open at each end.
Resting on and supported by the water tubes f is the steam chamber a which is
preferably made of a shape corresponding to that of the boiler b. The flanged water
tubes form stays and join the flat bottom of the chamber a and the flat top of the
boiler b together.
Fitted inside the chamber a immediately over the flanged water tubes ƒ are
flanged sockets h into which the lower en is of removable water tubes i are screwed
or otherwise fixed.
Arranged at each end of the boiler are four water circulating tubes ; which
communicate between the water space of the chamber a and the lower parts of the
boiler where the cold water lies.
The space k at the back of the furnace, which may be called the combustion
chamber, the front uptake and the back uptake m are fitted with doors n as
usual for giving access to these parts.
o is the steam dome and p the funnel. r is a partition.
Strengthening stays can be placed wherever necessary.
The water tubes fare preferably bolted in place so as to be removable.
The boiler is provided with the usual manholes and sludge and mud holes and alsc
with the usual boiler fittings.

page_text: With this construction of generator the hot gases of combustion pass from the
fur nace d over the fire bridge q into the combustion chamber k, from thence back
through the fire tubes e to the uptake l, and from thence through the space c and
among the water tubes to the back uptake m and funnel p. This type of generator
not only combines the best features of the water tube and fire tube systems but the
gas es are made to part with as much of their heat as possible before escaping.
It is of course obvious that boilers on the same principle may be constructed in
various ways such, for example, as having two or three furnaces and a corresponding
ar rangement of fire tubes.
The invention can be applied to both marine and land boilers.
If desired two or more boilers may be coupled together and in this case the steam
spaces would be connected together and the water spaces also connected together by
pipes.
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 consider novel
and desire to claim is :--
1. A steam generator having a steam chamber, a fire tube boiler, and an interme-
diate water tube space, substantially as set forth.
2. A combined water-tube and fire-tube steam generator constructed and arranged
substantially as hereinbefore described with reference to the drawings annexed.
Dated this 8th day of November 1897.
H. D. FITZPATRICK
70 Wellington Street, Glasgow, Agent.