IMPROVEMENT IN STEAM BOILERS
Year: 1886

page_text: I WILLIAM ROBERTSON of the Seville Iron Works, Spencer Avenue, Dublin,
Ireland, Mechanical Engineer, do hereby declare the nature of my invention for AN
IMPROVEMENT IN STEAM BOILERS 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 reference to a new and useful improvement in Steam Boilers
and is especially designed to diminish the injurious effect of the heat, or flame, from
the fire box on that part of the funnel or shaft which lies in the steam space of vertical
or upright Boilers.
In carrying out my invention I arrange a casing or jacket around that portion of
the funnel or shaft which is exposed to the action of the Steam in the boiler so as to
form an annular space around the outer surface of the funnel or shaft and through
suitable perforations on one side of this casing or jacket the Steam enters and impinging
against the funnel or shaft passes around same in its course to the Engine, or Safety
Valve. By this means a layer, or ring, of dry Steam is maintained in constant circu-
lation round the funnel, or shaft, and the latter is thereby saved from immediate
contact with the steam in the boiler, an arrangement which will tend towards the
preservation of the funnel or shaft, since according to my invention the casing or
jacket herein described is in the first instance acted upon by the Steam in the boiler.
In order that my said Invention may be more readily understood and applied in
practice I will describe the accompanying Drawings. Fig. 1 is a vertical transverse
section showing the application of my Invention to an ordinary vertical or upright
boiler; Fig. 2 is a plan of same; A is the fire box, B the funnel or shaft, C the
boiler, and the steam space; a. a. is the casing, or jacket enveloping the funnel, or
shaft, b. is the steam supply pipe leading from the casing or jacket, b¹ the pipe leading
to the safety valve, and supernumerary pipe, 62, from which latter, steam may be taken
at pleasure.
The lower end of the casing is flanged inwards for the purpose of preserving the
annular space, and also to grasp the surface of the funnel or shaft, and to prevent the
rising of the water or wet steam into the annular space, while the upper or top end is
bevelled outwards and is secured to the crown plate by bolts and nuts, or held in its
place by being gripped on the funnel. The bevelling or dishing of the top of the
D.

page_text: casing or jacket provides for the introduction of jets of steam in a diagonal direction
so as to impinge on that part of the crown plate, forming an angle with the funnel or
shaft.
On the side of the casing or jacket opposite to that at which the steam pipe b. 'is
connected, are shewn the perforations through which the steam enters and passes
round the annular space as indicated by the arrows. The casing or jacket may be
made in halves, or in such pieces as will readily admit of being introduced through the
manhole of existing, or new boilers.
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,
In Steam Boilers the use and application of a casing or jacket for the purpose and
in the manner substantially as herein described and set forth.
J. K. FAHIE & SON,
Agents for Applicant,
10, Leinster Street, Dublin.