Improvements in Smoke Exhausting Devices for Chimneys.
Year: 1895

page_text: Date of Application, 12th Nov., 1895
Complete Specification Left, 12th Aug., 1896-Accepted, 31st Oct., 1896
PROVISIONAL SPECIFICATION.
Improvements in Smoke Exhausting Devices for Chimneys.
I, CHARLES DOMINIQUE DUMONT, of 43 Rue des Aubépines Bois-Colombes,
Département de la Seine, in the Republic of France, Engineer, do hereby declare
the nature of this invention to be as follows :—
My invention relates to an improved smoke exhausting device for ohimneys
which I term "smoke exhauster" and which has for its object to strongly increase
the draught in chimneys, to which the same is applied and which causes the wind
to very advantageously co-operate in discharging air from dwelling rooms or work
shops. The same moreover oppresses the aution of the wind which blows into the
chimneys and which tends to force back the smoke.
This improved smoke exhauster is composed of an interior or central pipe of
galvanized sheet metal or of cast iron or the like, one part of which is provided
externally with parallel, helically wound angular iron bands. A second or outer
cylinder covers these angular iron bands in such a manner as to form therewith
and with the said interior or central pipe, helicoidal conduits. These helicoidal
conduits communicate with the outside through orifices or vent holes, distributed
over the lateral surface of the outer cylinder and placed proferably so as to pass
three or more times around the periphery of this. cylinder. From whatever
direction the wind may blow, the same will always find its way into a certain
number of the said air orifices of each crown or circle. These air jets first enter
horizontally, then rise in the direction in which the helicoidal channels pass, and at
the moment when they arrive at the height of the crown of vent holes iminediately
above, they meet partition walls which latter force them to pass through trapezoidal
or other orifices provided at this place in the interior pipe. A guide wall formed
by a circular arched metal plate arranged inside the internal or central pipe and
pendendicularly to each horizontal series of holes raises these air jets which are
then driven vertically in direction of the outlet orifices of the central pipe. Their
movement thus causes in this latter a suction and consequently an air current which
is taken from the locality, with which the apparatus is in communication.
This improved suction apparatus or exbauster which can be constructed in all
required dimensions, but the diameter of which will generally lie within fifteen to
fifty centimeters is mainly applicable
(1) To the top of the chimneys of engine bouses, where, by its powerful:action,
it carries off the smoke so injurious to persons employed in such houses,
(2) To the top of chimney flues of locomotives in which case kindling of the
fire is effected much more rapidly and therefore steam pressure obtained more
speedily. Consequently in the traction service of railways the locomotives can be.
set iu action in a shorter time and thus the number of "reserve " locomotives be
diminished.
(3) When placed on the top of factories and work shops, in which metal is
worked, it sucks up and carries off the smoke and gas from the inside of such work
shops produced by the forging, the reheating furnaces and the like.
(4) Finally, when arranged on the top of chimneys of dwelling houses it increases.
the draught and prevents the smoke from being forced back. It thus produces a
good ventilation of the apartments and rendere living therein wholesome.
DL: 10th 1905
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
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page_text: :
I, CHARLES DOMINIQUÉ DUMONT, of 43 Rue des Aubépines, Bois-Colombes,
Département de la Seine, in the Republic of France, 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 an improved smoke exhausting device for chimneys
which I term "smoke exhauster" and the object of which is to greatly increase
,the draught in chimneys to which it is applied, and which enables the wind to very
effectively assist in discharging air from dwelling houses or work shops. This device
moreover annihilates the action of wind which on entering the chimney forces back
the smoke therein.
:
1
!
This device is represented in the accompanying drawing, in which
Figure 1 is a sectional elevation of my apparatus ;
Figure 2 is an horizontal section on the line 1-2 of Figure 1;
Figure 3 is a vertical section in the direction of tlie axis, and
Figure 4 is a detail view of au air inlet.
This improved smoke exhauster consists of an interior pipo a of galvanized sheet
metal or cast iron, upon the upper part of which angle iron pieces b, are rivetted,
which surround the said pipe in a parallel helical line. A second pipe or cylinder e
covers these angle iron pieces in such a manner as to form helicoidal conduits
together with the said angle iron pieces and with the pipe a. These helicoidal
conduits communicate with the outside through the medium of orifices' or vent
holes d, distributed over the lateral surface of the cylinder e and placed preferably
at intervals equal to three or more helicoidal circles of this cylinder. In front of
each orifice da cup shaped enlargement X is arranged which serves to enable the
air to enter the apparatus tangentially to the cylinder a. In whatever direction
the wind may blow, it will always find its way into a certain number of vent holes
of each crown or circle. The air enters the apparatus through the orifices d and
first, passes in an horizontal direction; as it rises it follows the helicoidal channels
referred to, and at the moment when it meets the partition f placed across these
channels and closing them exactly, it enters the interior pipe a through orifices
provided in this pipe in front of each of the partitions. A guide partition h
formed by curved circular. sheet metal placed in the interior of the pipe o and
arranged perpendicularly to each horizontal row of air jet openings, raises these
fluid jets which are then carried along vertically in direction of the outlet orifice
of the central pipe. The movement of these jets produces in this central pipe a
suction and, thus causes an air current to pass from the apartment or apartments,
with which the apparatus communicates.
1,
This exhauster which may be constructed in all sizes, and the diameter of which
generally varies between fifteen and fifty centimeters is applicable:
2.
(1). To the chimney tops of engine-houses, through which, by its powerful action,
it carries off the smoke which is so injurious to people employed in such houses;
(2) To the top of locomotive chimney flues. Owing to the fact that the draught
is increased therein, the. lighting of the fire is effected much more rapidly and
consequently the steam pressure is obtained more readily. Thus in the railway
service the locomotives at disposal can be set in action in a comparatively short
time and the number of serviceable engines may be reduced:
(3) When placed. on top of buildings and factories, where metal is worked, it
draws up and carries off the fumes and gases contained in such buildings or
factories produced' by the forge waggons, heating furnaces and the like.
Finally when arranged on the top of dwelling houses, it increases the draught
.

page_text: and prevents the Emoke from being forced back therein. It thus insures a good
ventilation and renders.living therein wholesome.
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 apparatus, in which wind is utilized for increasing the draught in
chimneys-while the smoke is at the same time prevented from receding down-
wardly and for effecting the discharge of air from dwelling houses or work shops,
the said apparatus comprising substantially a central pipe a which is placed on the
upper part of chimney or discharge conduits, and upon the periphery of which
parallel angle iron pieces or bands 6 are fixed which are helically wound and
covered by a second pipe or cylinder e thus forming the helicoidal conduits which
communicate with the outside through the medium of orifices or air holes d
distributed over the surface of this second pipe or cylinder and preferably
arranged at distances equal to three or more helicoidal circles upon this cylinder;
said helicoidal conduits being interrupted by partition walls arranged below each
one of the upper air holes, so as to compel the air which enters the apparatus, to
penetrate the central pipe a through the medium of appropriate orifices g and to
escape in a vertical direction under the action of guide partitions h so as to produce
& powerful suction in this central conduit, substantially as described.
2. In an apparatus of the kind described in the first claim the air-hole device
having cup shaped widenings & arranged in front of the air inlet orifices, these
widenings enabling the air to enter the apparatus tangentially to the interior pipe a,
substantially as described.
4. In an apparatus of the kind described in the first claim a device for guiding
the air on entering the central pipe a, having guide partitions formed by circular
curved sheet metal pieces fixed to the interior of the pipe c and arranged so as
to correspond to the crowns or circles of orifices establishing a communication
between this pipe and the helicoidal conduits, substantially as described.
Dated thie 19th day of A imunt 1904
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.