Improvements in Chimney and Ventilating Shaft Tops.
Year: 1899

page_text: Date of Application, 24th Feb., 1899-Accepted, 1st Apr.,
1899
COMPLETE SPECIFICATION.
Improvements in Chimney and Ventilating Shaft Tops.
I, JULIEN RAYMOND BOUHON, of 325, Longue Rue d'Argile, Anvers, in the.
Kingdom of Belgium, 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 a novel apparatus designed to operate in an efficacious
manner for the draught of a chimney or ventilating shaft and to ventilate either
locally or at a distance from the place to be ventilated for such purposes as the
ventilation of malt-houses, drying rooms, malt kilns and similar places.
The invention consists in the disposition on the top of the chimney of a suction
cone consisting of several conical or cylindrical devices of progressively larger
diameters and which are adapted to overlap each other in such a manner as to
leave between them spaces or annular passages disposed one behind the other so
that the external air impinging on the cone will be divided by it into several
currents running round each other and producing an extremely energetic suction
through the cone, and chimney.
This action results not only by reason of the large number of suction and
exhaust currents set up, but by the fact that each of the currents produce a
suction action on the current immediately preceding it in such a manner that
each of the different currents reciprocally augment their speed and energy.
This ventilating cone can be closed or open at the apex (point of the cone) and
when necessary can be furnished with a central tube, which may or may not be
combined with an auxiliary suction tube fitted into the chimney.
In order that my invention may be the better understood I now proceed to
describe the same reference being had to the accompanying drawings hereunto
annexed in which I have illustrated three forms of construction of my invention.
The cone a is placed at right angles to the axis of a vertical tube b and is
adapted to turn in or at the top of a chimney. It is furnished with a vane not
shown in the drawing arranged so as to always present the apex of the cone to
the wind. The cone can be closed at the apex or be furnished at that part with
an opening such as that illustrated in the drawing.
This cone is composed of several truncated conical devices c, c, c, (Figures 1
and 2) or cylindrical devices ddd (Fig. 3) of progressively larger diameter
arranged so as to cover each other like the tubes of a telescope and to leave
between them annular spaces ff. The truncated cones c preferably have the
same angle with the base of the cone, in such a way that the conical parts cc will
be parallel (Figs. 1 and 2) as well also as will the cylindrical parts dd com-
posing the cone a (Fig. 3). It must be understood that without departing from
the principle of this invention truncated cones c can be employed, having an
inclination which increases as it nears the base, thus producing a cone having a
curved outline expanding towards the base.
The part of the cone arranged at the top of the cone 6 can be jointed to or
made with a single truncated conical device, or be composed of several cones or
linders torminating at the tube h (Fig. 3).

page_text: .
The exterior air impinging on the cone in the direction of the arrow x, is
divided into several currents y, which, traverse the narrow annular spaces f left
between the superposed devices c or d.
Each of these currents produce a suction action through the cone and the
tube or tubes opening into the latter: This suction action extends along the
length of the cone especially when it is composed of truncated conical devices c
(Figs. 1 and 2). The suction action of each of these currents not only joins that
of other currents but also produces an acceleration of speed to the current imme-
diately preceding it, in such a manner that the cone a produces an exhaustion of
considerable quantities of air gas or the like z, even when the current of external
air is relatively weak.
A central interior suction action can be added to the other suction action y,
exercising its influence along the length of the cone and augmenting the effi-.
ciency of the latter by means of a small opening at the apex of the cone or
better still by fixing in that opening a central tube y opposite the outlet to which is
fitted a dispersion cone h (Figs. 2 and 3). This central tube can if desired be
combined with a suction tube k arranged in the chimney (Fig. 3).
Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed I declare that what
I claim is:
-
1st. A ventilating apparatus consisting of a rotating suction cone placed at
right angles to the axis of a chimney, the said cone being composed of truncated
conical or cylindrical devices c or d telescopically fixed one to another and having
between-them-annular spaces-f-placed behind one another, whereby-the-exterior
air impinging on the cone is divided into a number of currents, blowing along the
length of the interior surface of the cone and producing a strong suction action
through the cone and the tube or chimney, substantially as described.
2nd. The combination of a horizontal rotative suction cone with truncated
conical or cylindrical devices, superposed on one another, with an opening at the
apex of the cone or with a tube open at the two extremities and arranged axially
with regard to the cone, and a dispersion cone preferably arranged at the outlet
of the said tube, substantially as described.
3rd. The combination of a horizontal, rotative suction cone with truncated coni-
cal or cylindrical superposed devices, with horizontal tubes and vertical tubes
arranged in the chimney, substantially as described.
4th. The construction and arrangement of a ventilating device substantially as
described and illustrated in the accompanying drawing.
Dated this 24th day of February 1899.
FELL & JAMES,
Agents for the Applicant.