Improvements in Steam Boilers.
Year: 1890

page_text: Date of Application, 8th Jan., 1890
Complete Specification Left, 18th Sept., 1890-Accepted, 25th Oct., 1890
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
We GEORGE EDWARD BELLISS and ALFRED MORCOM both of Ledsam Street
Works Birmingham in the County of Warwick Engineers and Boiler Makers and
ALBERT CHARLES PAIN of Noel Road Edgbaston Birmingham aforesaid Draughtsman
do hereby declare the nature of this invention to be as follows :-
Our invention has for its object to control the circulation of water in multitubular
steam boilers and prevent the overheating of the fire box sides and tube plates as well
as the fire box ends of the tubes or internal flues of the said boilers and is particularly
useful in connection with those kinds of boilers in which the combustion is effected by
a forced draught; and our said invention consists in surrounding the fire box and
front ends of the tubes or internal flues of the steam boiler with diaphragms or
partitions forming tanks or water chambers into which the feed water may be forced
and through which it is made to circulate; or in addition to the feed water water
from other parts of the boiler or other source may be made to circulate through the
said tanks or chambers.
In applying our invention to boilers of the return tube type we propose to fit a
diaphragm or partition (perforated with the necessary holes for the furnaces and
tubes) across the boiler a few inches away from the fire box tube plate and attached
to the boiler shell at the bottom and sides and rising slightly higher than the top of
the fire box crown. This diaphragm together with the shell and back end plate of the
boiler forming the tank or water chamber enclosing the fire box tube ends and fire
box. In applying our invention to a wet or dry bottom locomotive boiler we fix a
diaphragm or partition (perforated with holes similar to the tube plate) at a short
distance from the tube plate at the fire box end the tubes passing through it, the said
diaphragm forming one side of the tank or water chamber the other sides of the said
tank or chamber being formed by the shell of the boiler round the fire box. In
applying our invention to a low type marine boiler with circular furnaces opening
into a central fire box we propose to fit a diaphragm round the circular furnaces so
that this diaphragm and the diaphragm before described in the tube space should with
the portion of the shell plate enclosed between them form the tank or water circulating
chamber.
In cases where it is only required to protect the tube plates from overheating we fit
the diaphragm in the tube space at a suitable distance from the tube plate as before
described the diaphragm being used with or without side plates meeting the tube
plate.
In this arrangement the feed or feed and circulating water is so introduced as to
pass between the tube plate and the diaphragm.
The diaphragms may be otherwise arranged to suit other types of boilers than those
before referred to or may be arranged so as to control the flow or circulation of the
feed or other water from one part of the heating surface to another as may be
desired. When in addition to the feed water, water from [the boiler or other source
is passed into the tank or water circulating chamber or chambers we use for this
purpose centrifugal or other pumps: or the feed water may be injected into the tanks
or chambers through one or more simple or compound forms of nozzles inside the
boiler to induce or produce currents having considerable volume.
The feed water alone may be forced into the tanks or circulating chambers, that is,
without the addition of other circulating water.
Dated this Eighth day of Jan 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
We GEORGE EDWARD BELLISS and ALFRED MORCOM both of Ledsam Street
Works Birmingham in the County of Warwick Engineers and Boiler Makers and
ALBERT CHARLES PAIN of Noel Road Edgbaston Birmingham aforesaid Draughtsman
do hereby declare the nature of our invention and the manner in which the same is
to be performed to be particularly described and ascertained in and by the following
statement:
Our invention has for its object to control the circulation of water in multitubular
steam boilers and to prevent the overheating of the fire box sides and tube plates as
well as the fire box ends of the tubes or internal flues of the said boilers; and is
particularly useful in connection with those kinds of boilers in which the combustion
is effected by a forced draught; and our said invention consists in surrounding the
fire box and front ends of the tubes or internal flues of the steam boiler with
diaphragms or partitions forming water chambers into which the feed water may be
forced and through which it is made to circulate; or in addition to the feed water,
water from other parts of the boiler or other source may be made to circulate through
the said chambers.
In applying our invention to boilers of the return tube type we propose to fit a
diaphragm or partition (perforated with the necessary holes for the furnaces and
tubes) across the boiler a few inches away from the fire box tube plate and attached to
the boiler shell at the bottom and sides and rising slightly higher than the top of the
fire box crown. This diaphragm together with the shell and back end plate of the
boiler forming the water chamber enclosing the fire box tube ends and fire box.
.
When in addition to the feed water, water from the boiler or other source is passed
into the water circulating chamber or chambers we use for this purpose centrifugal
helical or other pumps; or the feed water may be injected into the chambers through
one or more simple or compound forms of nozzles inside the boiler to induce or
produce currents having considerable volume. The feed water alone may be forced
into the circulating chambers that is without the addition of other circulating
water.
Figure 1 of the accompanying drawing represents in longitudinal vertical section
the application of our invention to a boiler of the return tube type. In the said
Figure 1A A represents the diaphragm crossing the boiler a short distance from the
fire box and tube plate the said diaphragm forming with the shell and back plate of
the boiler the chamber B enclosing the fire box B² and tube ends B³. It will be
seen by an examination of the drawing that the diaphragm A is perforated with holes
for the passage of the tubes and that it rises slightly above the top of the crown of
the fire box B. Feed water is introduced into the boiler at C and drawing with it
boiler water by means of the inducing nozzles D passes into the chamber B through
the tube E setting up a circulation of the water as indicated by the arrows and
thereby preventing the overheating of the sides of the fire box B³ fire box tube plate
and fire box ends B³ of the tubes.
In applying our invention to a wet or dry bottom locomotive boiler we fix a
diaphragm or partition (perforated with holes similar to the tube plate) at a short
distance from the tube plate at the fire box end the tubes passing through it the said
diaphragm forming one side of the water chamber the other sides of the said chamber
being formed by the shell of the boiler round the fire box.
Figure 2 represents in section the application of our invention to a boiler of the
modified locomotive type with water space under the ash pit; AA is the diaphragm
forming with the front and side plates of the boiler the chamber B which chamber B
opens into the water space around the fire box B2 as represented. The impeller C
actuated mechanically in any convenient. manner draws. water. from the boiler. and
forces it into the chamber B through the tube E thereby setting up currents or a
circulation of water in the direction indicated by the arrows.

page_text: We wish it to be understood that the inducing nozzle and impeller shown in
Figures 1 and 2 are for the purposes of illustration only as any other suitable form of
impeller may be used for causing the water to circulate in the boiler.
In cases where it is only required to protect the tube plates from overheating we fit
the diaphragm in the tube space at a suitable distance from the tube plate as before
described the diaphragm being used with or without side plates meeting the tube
plate.
In this arrangement the feed or feed and circulating water is so introduced as to
pass between the tube plate and the diaphragm.
We prefer the diaphragm to fit the shell moderately well but in either of the cases
referred to or similar boilers the diaphragms need not be closely fitted to the shell
plating but a space may be left for the passage of water at the bottom of the diaphragm
or a part of the diaphragm at the bottom may be made portable and movable by
means of rods from the outside.
The diaphragms may be otherwise arranged to suit other types of boilers than
those before referred to or may be arranged so as to control the flow or circulation of
the feed or other water from one part of the heating surface to another as may be
desired.
Having now particularly described and ascertained the nature of our invention
and the manner in which the same is to be performed we declare that we claim
as our invention of "Improvements in steam boilers" :-
The adaptation to or combination with steam boilers of a diaphragm or diaphragms
or a dividing plate or plates substantially in the manner hereinbefore described and
illustrated in the accompanying drawing so as to form a chamber enclosing certain
parts of the heating surface of the boiler into which chamber the feed water with or
without the addition of water from other parts of the boiler or from other source or
water from other parts of the boiler alone may be forced and through which it is made
to circulate substantially as described and illustrated.
Dated the 18th day of September 1890.
W. T. WHITEMAN,
Agent for the Applicants.