Improvements in or appertaining to Induced Draught Apparatus for Marine and other Furnaces.
Year: 1894

page_text: Date of Application, 20th Jan., 1894
Complete Specification Left, 20th Nov., 1894-Accepted, 22nd Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in or appertaining to Induced Draught Apparatus for
Marine and other Furnaces.
I, THOMAS HENDERSON of 6 and 8 Trueman Street, in the City of Liverpool,
Mechanical Engineer do hereby declare the nature of this invention to be as
follows:-
In the various arrangements for forced draught at the present time, air pumping
devices have been used in the boiler room taking up a large amount of space,
steam jets have been employed in various positions involving a very considerable
waste of steam and also in some cases having an injurious effect upon the fire.
Further in all systems of forced draught in which the draught is forced into the
furnace instead of being induced, the operation of stoking is greatly interfered
with.
Now my invention consists in inducing the draught by means of an air propeller
in the funnel itself.
This can be driven in any convenient manner from the engines, or have a special
engine for the purpose, or it can be driven electrically. The air propeller will be
horizontal with a vertical axis, and can either be driven from the axis or preferably
from the circumference. It is desirable that the portion of the uptake or chimney
in which the propeller works shall be cylindrical.
Dated the 19th day of January 1894.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
Improvements in or appertaining to Induced Draught Apparatus for
Marine and other Furnaces.
I, THOMAS HENDERSON of 6 and 8 Trueman Street in the City of Liverpool,
Mechanical 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 :-
In the various arrangements for forced draught at the present time for marine
and other furnaces, air pumping devices have been used in the boiler room
taking up a large amount of space, steam jets have also been employed in various
positions involving a very considerable waste of steam and also in some cases
having an injurious effect upon the fire. Further, in all systems of forced draught
in which the draught is forced into the furnace instead of being induced, the
operation of stoking is greatly interfered with.
Now my invention consists in inducing the draught by means of an air propeller
in the funnel or uptake itself, and one convenient way of arranging and driving this
is shown on the accompanying drawings-
Figure 1 being a sectional elevation, and
TN

page_text: In these A is the funnel, which is preferably cylindrical, and B the air propeller
which is keyed or otherwise rigidly secured to the vertical spindle C. D is a
bracket which provides hearings for the spindle C and the horizontal shaft E on
which is mounted bevel wheel F. G is a second bevel wheel mounted on the central
spindle and gearing with the aforementioned bevel wheel F. H is a second bracket
for supporting the vertical spindle C and provided with roller bearings I to receive
the thrust of the shaft C.
The
In the drawing, the boss of the propeller is shown resting on these roller
bearings, I, but a collar on the spindle would serve the same purpose.
horizontal shaft E extends through as shown to the outside of the funnel and can
be driven in any convenient manner either from the engines, or a special engine K
may be provided as shown on the drawings supported by girders L'or in any other
suitable manner, or it may be driven electrically.
This invention is not limited to the exact arrangement herein described and
illustrated on the accompanying drawings, as it will be obvious that it may take
other forms without departing from the spirit of the invention. Thus in some
cases the propeller may be arranged vertically, diagonally or otherwise instead of
horizontally, and moreover the propeller may be driven from its circumference instead
of from its central vertical axis, the essential feature of this invention consisting in
arranging a propeller inside the funnel and driving it from the outside for the
purpose of creating an induced draught.
Having now particularly described and ascertained the nature of my said inven
tion, and in what manner the same is to be performed, I declare that what I
claim is
--
1. An improved method of creating an induced draught in marine and other
furnaces which consists in arranging an air propeller inside the funnel or uptake,
and driving the same from the outside of the funnel or uptake by any suitable source
of power.
2. In combination, for the purpose of driving a horizontal air propeller, a
central vertical rotatable spindle inside the funnel or uptake, on which the
propeller is rigidly secured, a horizontal shaft geared to the vertical spindle and
coupled to an engine on the outside of the funnel, and brackets for supporting
and forming bearings for the said spindle and shaft, substantially as set forth.
3. The combined arrangement and construction of parts forming my improved
induced draught apparatus for marine and other furnaces, substantially as
described.
Dated this 19th day of November 1894.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London,
Patent Agents.