Improvements in or connected with Steam Generators for Promoting the Circulation of Water therein.
Year: 1892

page_text: Date of Application, 22nd Oct., 1892
Complete Specification Left, 24th July, 1893-Accepted, 16th Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with Steam Generators for Promoting
the Circulation of Water therein.
I, JOHN THOм, of 93, Hope Street, Glasgow, in the County of Lanark,
Consulting Engineer, do hereby declare the nature of this invention to be as
follows:-
""
My present invention relates more particularly to steam generators of the
"marine or analogous types; and has for its object to improve or promote the
circulation of water therein, and render the operation of getting up steam more
rapid than under ordinary conditions; and also to render the production of steam
more rapid in generators having a given amount of heating surface.
According to my invention, these ends are effected by enclosing certain spaces
within the generator, and forming them into conduits or passages reaching from
the lower part thereof to the upper part, say to near the water level.
In one arrangement, transverse plates are provided in front of the tube plate of
the combustion chamber of a steam generator, and the space at the side is enclosed
by side plates. These plates may be carried down round and on the furnace flues
or the conduits may be carried down independently of the furnace, to the bottom of
the generator through the spaces between the furnaces. These plates forming
conduits may be applied in connection with each combustion chamber and set of
tubes, when separate combustion chambers are employed; or, with the whole of the
tubes as a single conduit. By this means the water is drawn up and circulated and
over the hotest part of the combustion chamber and tubes.
In connection with the top of conduits or passages used in steam generators for
the purpose of promoting circulation, I, in some cases, provide a plate so as to
restrict the outlet, and direct the flow in the directions required. For instance,
when this cover or plate is fitted to conduits or passages in or about the combustion
chambers, the discharge may be directed towards the front tube plate.
The transverse plates used for making the conduits or passages above specified
are made in a number of parts, having semicircular gaps, so that they fit in
between each row of tubes.
In another arrangement for promoting circulation, according to this invention, a
transverse diaphragm or diaphragms may be fitted across the generator near or
towards the combustion chamber, openings or passages being provided or allowed
in the bottom of the generator. The circulation of the water in this case will be
from the front, to the combustion end or part of the generator under the said
diaphragm or diaphragms, then up and backwards over the upper edge thereof
towards the front or fronts of the generator. A cover, in some cases, may also be
provided in connection with the diaphragm or diaphragms, so as to direct the flow
and restrict the outlet. .
This invention, it is to be stated, is not restricted to the particular forms or
dispositions of parts more particularly specified, and may be applied to different
kinds of steam generators where the effects described can take place.
Dated this 21st day of October 1892.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Steam Generators for Promoting
the Circulation of Water therein.
I, JOHN THOM, of 93, Hope Street, Glasgow, in the County of Lanark,
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 :—
My present invention relates more particularly to steam generators of the marine
or analogous types, that is, those of the multitubular kinds-including locomotive
and Admiralty types (it can also be fitted on the ordinary internal flue land boiler):
and has mainly for its object to improve or promote the circulation of water
therein, and render the operation of getting up steam more rapid than under
ordinary conditions; and also to render the production of steam more rapid in
generators having a given amount of heating surface.
According to this invention a transverse diaphragm or diaphragms is or are fitted
across the generator near or towards the combustion chamber, openings or passages
being provided or allowed at or near the bottom of the generator. The circulation
of the water in this case will be from the front, to the combustion end or part of
the generator under the said diaphragm or diaphragms then up and backwards over
the upper edge thereof towards the front or fronts of the generator. A cover in
some cases may also be provided in connection with the diaphragm or diaphragms,
so as to direct the flow and restrict the outlet.
Illustrations of the invention above specified are given in the drawings hereto
annexed.
Figure 1 of the drawings is an elevation, and Figure 2 is a plan in section,
illustrating a multitubular marine boiler shewing one arrangement according to this
invention; and Figure 14 is an end view of part of the diaphragm.
Figure 3 is an elevation, and Figure 4 is a plan in section, illustrating another
form of the invention above described.
Figure 5 is an elevation of an Admiralty type of boiler, and Figure 6 is an
elevation of a locomotive type of boiler, provided with improvements according to
this invention.
In the drawings, a are the combustion chambers, of which a' are the tube plates;
b are the furnaces; c are the tubes; and e is the diaphragm.
Referring in the first instance to Figures 1 and 2, the diaphragme is provided
across the steam generator and practically divides it into two parts. In the
drawings given it is disposed in front of the tube plate a' and connected to the sides
of the boiler, but this particular disposition is not essential. The diaphragm is not
carried down to the bottom, but a space is left for the passage of the cooler waters
from the front part of the steam generator to the back part about the combustion
chambers.
Of course this arrangement can also be applied to double ended steam generators
(with or without common combustion chambers) by providing a second diaphragm e
in a like manner in relation to the combustion chambers.
The action is that the water encased by the diaphragm e about the combustion
chambers, tube plates, and front part of the tubes, is caused to ascend through the
greater generation of steam and higher temperature of water on one side of the
diaphragme and to descend on the other side of the diaphragm e, downwards to
the bottom of the steam generator and then under the lower edge or lip of the
diaphragm e into the space about the combustion chamber.
The diaphragine may be made of narrow plates with gaps in then to suit the
radius of the tubes, so that they may be applied and fitted between each row of
tubes, as shewn at Figure 1A.

page_text: In the arrangement shewn in Figures 3 and 4 the diaphragm e is provided across
the steam generator in line with the tube plate, and divides it into two parts.
e
In the arrangement shewn in Figure 5 and Figure 6, the diaphragm è is disposed
to suitably divide the steam generator into parts. When the construction or
arrangement shewn in Figure 5 is employed, as the combustion chamber comes
between the furnace and the tubes I may provide a second diaphragm e, as
provided for in the case of double ended boilers.
It will be plain that this arrangement can be applied to different forms of
multitubular steam generators other than those shewn.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A steam generator divided laterally into two or three parts by a diaphragm or
diaphragms across the same at or near the tube plate or plates of the combustion
chambers; substantially as and for the purposes specified.
2. Steam generators provided with or arranged according to the improvements
specified in the preceding claim, applied particularly as set forth with reference to
and shewn in the different figures of the drawings hereto annexed.
1000
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.