Improvements in Dust Collectors.
Year: 1897

page_text: Improvements in Dust Collectors.
I, AUGUST STROBELL, of Leine-Mühle, Alfeld on the Leine, in the Empire of
Germany, Miller, do hereby declare the nature of this invention to be as
follows:-
This invention is based on the wellknown principle of dust separating by a circular
motion of the air to be purified in smooth curved surfaces, but a peculiar course is
given to it by specially advantageous arrangements.
In the accompanying drawings this improved apparatus is shown,
Figure 1 being a sectional elevation ;
Figure 2, a horizontal section ; and
Figure 3, an elevation; and
Figures 4, 5, 6 and 7 details of the discharge doors or flaps.
The device consists of a cylindrical chamber A and an annular chamber B co-axial
thereto. The walls of both are kept as smooth as possible. Both have on their
periphery a number (say 6 or 8) of slits or slots covered hood fashion by vertical
pipes C closed beneath. A transfer pipe D (or several such) leads from the annular
chamber B into the cylindrical inner chamber A by means of a perforation of the
separating walls.
The admission of the dust laden air takes place tangentially as may be seen in the
elevation, Figure 3, with a slight downward inclination. The air is thus first moved
spirally downwards in the ordinary manner on the inner side of the outer wall of the
annular chamber B, driving the coarser dust mingled with it through the slits and
When the air has reached the bottom floor of
depositing it in the vertical pipes C.
the annular chamber B, it passes through the previously mentioned pipe D' into the
inner cylindrical chamber A, and as the exit from this chamber lies at the upper end
whilst the inflow takes place at the bottom with a slight upward inclination, the air
rises spirally upwards in the chamber A exactly as it was moved downwards in the
annular chamber B. A separation of the finer dust thus takes place, which dust is
deposited in the inner vertical pipes C. The purified air escapes at E through the
cover of the casing.
-
The accumulated dust is removed at intervals from the pipes C by their being
opened at the lower end and the dust contained in them blown, by the pressure of
air existing in the interior of the casing, into a sack or the like suspended beneath.
This opening must only take place alternately with only one pipe or, at most, few
pipes simultaneously, in order that only a little wind may escape from the apparatus
and that no great evolution of dust may take place outside.
The device for the alternate opening and closing of the separate pipes C may be
of any suitable kind. In Figures 4-7, a flap or shutter arrangement is shown as an
An arm G moves slowly in
example, which arrangement is held by a catch hook F.
a circle from the central axis of the casing. When it encounters the lower projection
of the hook F, it forces the latter backward and the flap drops into the position
I shown in Figure 6. A second shorter arm H however follows behind the arm G,
2

page_text: which shorter arm again raises the flap by the use of an inclined plane J so that the
hook F can again catch the flap.
Figure 4 shows a bottom plan of such an arrangement; and
Figure 7 a side view.
For the second circle of tube openings, either a second fork arm G H may be
arranged suitably displaced as against the first, or spurs or projections may project
from the arms G and H, which spurs are angularly displaced relative to the ends of
the arms G and H corresponding to the distribution of the tubes, so that an inner
and outer pipe is opened alternately. If desired a simultaneous opening of any two
of the pipes may of course equally well take place.
Dated this 22nd day of March 1897.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.
I, AUGUST STROBELL, of Leine-Mühle, Alfeld on the Leine, in the Empire of
Germany, Miller, 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 is based on the wellknown principle of dust separating by a circular
motion of the air to be purified in smooth curved surfaces, but 'a peculiar course is
given to it by specially advantageous arrangements.
In the drawings accompanying the Provisional Specification this improved apparatus
is shown:
Figure 1 being a sectional elevation ;
Figure 2 a horizontal section; and
Figure 3 an elevation ; and
Figures 4, 5, 6 and 7 details of the discharge doors or flaps.
The device consists of a cylindrical chamber A and an annular chamber B co-axial
thereto. The walls of both are kept as smooth as possible. Both have on their
periphery a number (say 6 or 8) of slits or slots covered hood fashion by vertical
pipes C closed beneath. A transfer pipe D (or several such) leads from the annular
chamber B into the cylindrical inner chamber A by means of a perforation of the
separating walls.
.
The admission of the dust laden air takes place tangentially as may be seen in the
elevation, Figure 3, with a slight downward inclination. The air is thus first moved
spirally downwards in the ordinary manner on the inner side of the outer wall of the
annular chamber B, driving the coarser dust mingled with it. through the slits and
depositing it in the vertical pipes C. When the air has reached the bottom floor
of the annular chamber B, it passes through the previously mentioned pipe D into the
inner cylindrical chamber A, and as the exit from this chamber lies at the upper end
whilst the inflow takes place at the bottom with a slight upward inclination, the air
rises spirally upwards in the chamber A exactly as it was moved downwards in the
annular chamber B. A separation of the 'finer dust thus takes place, which dust is
deposited in the inner vertical pipes C. The purified air escapes at E through the
cover of the casing.
The accumulated dust is removed at intervals from the pipes C by 'their being
opened at the lower end and the dust contained in them blown, by the pressure of
air existing in the interior of 'the casing, into a sack or the like suspended beneath.
This opening must only take place alternately with only one pipe or, at most, few

page_text: pipes simultaneously, in order that only a little wind may escape from the apparatus
and that no great evolution of dust may take place outside.
The device for the alternate opening and closing of the separate pipes C may be of
any suitable kind. In Figures 4-7, a flap or shutter arrangement
shown as an
example, which arrangement is held by a catch hook F. An arm G moves slowly in
a circle from the central axis of the casing. When it encounters the lower projection
of the hook F, it forces the latter backward and the flap drops into the position
shown in Figure 6. A second shorter arm H however follows behind the arm G,
which shorter arm again raises the flap by the use of an inclined plane J so that the
hook F can again catch the flap.
Figure 4 shows a bottom plan of such an arrangement, and
Figure 7 a side view.
For the second circle of tube openings, either a second fork arm G H may be arranged
suitably displaced as against the first, or spurs or projections may project from the
arms G and H, which spurs are angularly displaced relative to the ends of the arms G
and H corresponding to the distribution of the tubes, so that an inner and an outer
pipe is opened alternately. If desired a simultaneous opening of any two of the pipes
may of course equally well take place.
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. A dust collector acting by centrifugal force having two concentric cylinders
through which the air to be purified passes successively in a spirally rising or falling
direction, characterised by smaller dust separating cylinders (C) being arranged on
the outer walls of the cylinders (BA) which small cylinders or pipes are connected
with the cylinders (B A) by means of a narrow slot or slit, substantially as herein-
before described.
2. In a dust collector such as described, providing the small cylinders (C) with
means for closing their lower ends in such a way that whilst at work each cylinder
successively (or even several simultaneously) may be alternately opened and closed
for the purpose of removing the dust, substantially as herein before described.
Dated this 21st day of December 1897.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.