Improvements in Steam Generators.
Year: 1895

page_text: Date of Application, 18th July, 1895
Complete Specification Left, 18th May, 1896-Accepted, 20th June, 1895
PROVISIONAL SPECIFICATION.
Improvements in Steam Generators.
1, HENRY CROMPTON ASHLIN, of 14 Water Street, Liverpool, in the County
of Lancaster, Consulting Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to steam boilers particularly of the marine type in which
while economising space I am able to dispense with a great deal of the staying
usually employed, and at the same time to ensure a strong and safe boiler. In
forming the boiler shell I make it in the form of a tube with rounded top and
bottom and flattened sides, and rounded ends, not unlike the old egg-end boiler
excepting that the sides at the central portion of their height are flattened; the
boiler lies horizontally either parallel with the keel of the vessel or athwartships.
The furnace, combustion chamber and return tubes may be substantially such as
are now commonly used, but instead of the furnace and tubes lying as they
ordinarily do parallel with the axis of the boiler they are in my improved
arrangement perpendicular thereto lying across the boiler so that one of the side
walls of the shell forms the front of the boiler and is the tube plate, the other side
of the boiler forming the back.
With this arrangement I can place a large number of furnaces each with its
appropriate combustion chamber and return tubes side by side, thus greatly
economising space.
With this arrangement the front or tube plate of the boiler is amply stayed with
the tubes to the smoke-box.while the back of the smoke-box may be stayed to the
back of the boiler by short screwed or rivetted stays such as are commonly used in
similar places in locomotive and other boilers. The top of the smoke-box may be
stayed either to the shell of the boiler or by means of projecting stays such as are
used in a similar position in locomotive boilers. For convenience I make the ends
of the boiler not semispherical but circular in one plane and flat in another the end
plate being approximately diamond-shaped or two triangles joined together at
their bases, the side walls of the shell being suitably shaped to meet them.
To prevent too much shifting of the bulk of the water I can whenever required
place diaphragm plates across the boiler carrying them as high up as may be
necessary.
*
Dated this 18th day of July 1895.
BOULT & WADE,
Agents for the Applicant.
I, HENRY CROMPTON ASHLIN of 14 Water Street, Liverpool, in the County
of Lancaster, Consulting Engineer, 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 steam boilers particularly of the marine type in which

page_text: while economising space I am able to dispense with a great deal of the staying
usually employed, and at the same time to ensure a strong and safe boiler.
In the accompanying drawings,
Figure 1 is a transverse section of one construction of boiler according to this
invention, on the line 1, of Figure 2, which is a longitudinal central section of the
same.
Figure 3 is a perspective diagram showing the semi-cylindrical end, of the boiler
shown in Figures 1 and 2;
Figure 4 is a longitudinal central section of an alternative construction of boiler
according to this invention;
Figure 5 is a transverse section on the line 5, 5 of Figure 4, and
Figure 6 is a sectional plan on the line 6, 6 of Figure 4.
Like letters indicate like parts throughout the drawings.
With reference first to Figures 1 and 2 in forming the boiler shell I make it in
the form of a tube with rounded top A and bottom B and flattened sides C D and
rounded ends E, not unlike the old egg-end boiler excepting that the sides at the
central portion of their height are flattened; the boiler lies horizontally either
parallel with the keel of the vessel or athwartships. The furnaces F combustion
chambers G and return tubes H may be substantially such as are now commonly
used, but instead of the furnaces and tubes lying as they ordinarily do, parallel
with the axis of the boiler, they are in my improved arrangement perpendicular
thereto, lying across the boiler so that the side wall C of the shell forms the front
of the boiler and is the tube plate, the other side D of the boiler forming
the back.
With this arrangement I can place a large number of furnaces each with its
appropriate combustion chamber and return tubes side by side, thus greatly
economising space.
Although the furnaces and combustion-chambers are shown in Figures 1 and 2
as being included in the boiler-structure proper, they need not necessarily be so
arranged.
are
The front or tube plate C of the boiler is amply stayed by the tubes H to the
combustion chambers, while the backs of the combustion-chambers may be stayed
to the back of the boiler D, by short screwed or rivetted stays such as
commonly used in similar places in locomotive and other boilers. The tops of the
combustion-chambers may be stayed either to the shell of the boiler or otherwise
as may be desired. Although the ends of the boiler may be if desired hemispherical
I preferably make them circular in one plane and flat in another i.e., approximately
semi-cylindrical, as indicated in Fig. 3, the end plate E being approximately
diamond-shaped or like two triangles joined together at their bases, the side walls
of the shell being suitably shaped to meet them.
To prevent too much shifting of the bulk of the water by rolling at sea I can
whenever required place diaphragm plates such as J across the boiler between two
or more sets of tubes and furnaces carrying them as high upas, may be necessary,
and preferably making openings therein to equalise the steam pressure at opposite
sides of the diaphragm.
In the boiler illustrated in Figs. 4, 5 and 6 the arrangements are similar to
those indicated in Figs. 1 and 2 except that the combustion-chambers G are
external and constituted by a water-chamber or box L connected with the flat
side D of the boiler by hollow partitions M through which the water circulates
from the water-space of the boiler to that of the water-chamber L and vice-versa.
Arches or plates N and O, of fire-brick or other refractory material are provided
at the top and bottom, respectively, of each combustion-chamber. G to form the.
roof and floor thereof, between the partitions M. The upper part of the water-
chamber L may be connected, for instance by pipes P as shown, to the steam-drum Q
or other steam-space of the boiler.
The two endmost combustion-chambers in Figs. 4 and 6 each open upon the
adjacent end-plate E of the boiler, the openings being normally closed by doors R

page_text: of fire-brick or other refractory material, readily removable to permit access to be
had to the interior of the combustion-chambers for cleaning, inspecting or repairing
them.
The roofs and floors NO of the combustion chambers may be arranged so as to
be removable with equal facility for like purposes.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
1. A steam-generator in the form of a tube with rounded top and bottom.
flattened sides and rounded ends having tubes H extending from one flattened side
to a combustion chamber or chambers G at the other and furnaces F below and
parallel to the tubes, substantially as and for the purposes described.
2. A steam-generator in the form of a tube with rounded top and bottom
flattened sides and rounded ends the latter being semi-cylindrical having tubes H
extending from one flattened side to a combustion chamber or chambers G at the
other and furnaces F below and parallel to the tubes substantially as and for the
purposes described.
3. In a steam-generator of the kind described diaphragm plates J to prevent
sudden shifts of the liquid contents of the generator.
4. A steam-generator in the form of a tube with rounded top and bottom
flattened sides rounded ends and combustion-chambers G one or both of the outer
combustion-chambers K opening upon the rounded end or ends substantially as and
for the purpose described.
5. A steam-generator in the form of a tube with rounded top and bottom
flattened sides and rounded ends having external combustion-chambers G constituted
by a water-chamber such as L connected with the water-spaces of the boiler by
hollow partitions M which have roofs and floors N O between them with or without
a connection P between the water-chamber L and steam-spaces of the boiler sub-
stantially as and for the purposes described.
6. The combination and arrangement of parts constituting a complete steam-
generator substantially as and for the purpose hereinbefore described and
illustrated in Figures 1 and 2 or Figures 45 and 6 of the accompanying
drawings.
2000
H. C. ASHLIN.
Boult & Wade,
Agents for the Applicant.