Improvements in Dust-collectors.
Year: 1890

page_text: Date of Application, 23rd Dec., 1890-Accepted, 14th Feb., 1891
COMPLETE SPECIFICATION.
Improvements in Dust-collectors.
We, CARL HEINRICH KÖRNIG, of Strassbourg, in the Alsace, German Empire,
Millwright, and GEORG BÜRGIN, Merchant, of Strassbourg in Alsace, German
Empire, 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 dust collectors for use in all factories where considerable
pecuniary loss is caused owing to the escape of much valuable material in the form
of dust, but more particularly for flour mills, where, in spite of the employment of
dust receptacles and collecting apparatuses, the loss of materials frequently amounts
to 25-30%
Our invention consists of a cylindrical receptacle having a conical bottom, closed
at the top and arranged to receive a sack or other receptacle at its lower end. The
apparatus is further provided with cones arranged inside in the manner hereinafter
described and adapted to cause the air coming from the blast to pass spirally
downwards on the interior surfaces of the cylinder, leave the dust, which it contains,
in the conical bottom, by means of ribs or wings arranged for this purpose, and then
return up the middle of the apparatus back into the room.
In order to make this invention more clear, I refer to the accompanying drawing,
in which similar parts, throughout the several views.
Fig. 1 is a vertical section through the centre of the improved apparatus.
Fig. 2 is a plan of the same.
Fig. 3 is a section on line A-B in Fig. 1.
Fig. 4 is a section on line C-D in Fig. 1.
Fig. 5 is a side elevation of the apparatus.
The apparatus consists of a cylinder, made in three pieces air tight connected
together. The upper part a is provided with top and bottom flanges, the former
for the attachment of the cover, the latter for fixing it to the second or middle
part . In the upper cylinder a is an inlet a', so arranged in the side of said
cylinder; that the air entering and laden with dust, will strike on the inside of the
same. The centre piece, which is also provided with two flanges, is connected by
means of its lower or bottom flange, to the conical end piece c, which runs out to a
pipe e at the bottom.
This conical bottom piece c is provided with blades or ribs d arranged internally
and twisted or curved in a direction facing that of the current of air entering the
apparatus. This pipe our mouth piece e at the bottom of the apparatus, serves
for the reception of a sack in which the particles of dust such as "thirds" etc., are
collected.
This external casing a bc, is closed by a cover a² having an orifice in its centre,
and to which are attached rods or other convenient means for suspending the
apparatus from the ceiling. The cover is further provided with a standard I, which
guides the rod. A conical tube i is also arranged on the cover, having its smallest
end downwards, and the length of which preferably exceeds that of the inlet a by
of the said inlet length.
The rod, passing centrally through this hollow cone i extends downwards and
ends in a cross piece m, to which it is attached and which latter fits very loosely in
the pipe e. On the lower part of the rod, a double cone y is arranged running out
to a point at its upper end, but open at its lower end. The height of this double
cone g may be adjusted by means of the screw h.
The apparatus operates on the centrifugal principle and in the following
manner.

page_text: In mills, as is generally known, those parts which get heated, owing to the
friction caused by grinding, are kept cool by blasts or blowers, which however,
besides cooling the stones raise an enormous quantity of dust, filling the air around
with the same.
In order to re-collect this dust, the current of air froin the blasts is
caused to enter the apparatus, hereinbefore described at the inlet a'. As this inlet
is arranged in a slanting direction and not radical, the air on entering will impinge
against the inside of the cylinder a and consequently take a downward motion,
which on account of the continued rushing in of the current, will be a spiral down-
ward motion. This motion will be materially assisted by the conical tube i. This
motion of the air now causes the dust particles contained in the latter, owing to the
centrifugal force, to be driven against the insides of the cylinder; and consequently
to be caught up by the ribs or blades d. These blades, being arranged in the
opposite direction to that of the air current, hold the particles preventing the same
from being again blown up by the air current. Thus the said dust. particles will
slide down between the blades d through the outlet e into the sack arranged there
under. The cross piece m in the outlet pipe i is for the purpose of preventing the
air current from entering the sack and blowing its contents, about or rather
preventing them from falling out into the sack. The current of air will be broken
and partially destroyed or deviated by this cross piece.
After the air-has now been freed from the dust which it contained, it will, on the
principal of centrifugal force, take a middle course, passing or grazing on the
double cone g in an upward direction. The air current now follows the direction of
the upper part of the double cone g remaining in the centre of the apparatus and
not mixing with the dusty air entering the apparatus. Thus this current of
pure
passes through the conical tube i, out of the collector.
air
The principal advantage however of the double cone g, is that by adjusting the
same, the centrifugal force in the collector may be adapted to any size or purpose.
Having now particularly described and ascertained the nature of this said inven-
tion; what I claim-and-desire to secure by Letters Patent is:
1. The combination of a cylinder having an inlet arranged at its-upper end, as
described a conical bottom, and-a-cover-at-the-top, said cover provide with a conical
tubular outlet, the sides of which, extend downwards inside the cylinder,.a rod,
extending vertically through the apparatus, and supporting a double cone in the
interior of the said apparatus and ending in a cross piece m arranged in the outlet
-of-the-collector, all parts acting in combination with one another in the manner and
for the purpose substantially as described.
2. The combination with a dust collector having a cylindrical upper part and a
conical bottom, with an outlet-having-a-cross piece in arranged therein, having
further an air inlet and conical tubular air outlet, and double cone y arranged as
specified, of the ribs or blades arranged inside the conical bottom and curved
spirally in a direction adverse to that of the current of air, for the purpose substan-
tially as described.
3. In combination with the dust collector of the construction claimed an air inlet
arranged in the upper part of the cylinder tangentially to the circumference of the
same in the manner substantially as described and shown.
4. In the said apparatus, a device such as the screw h for adjusting the height of
the double cone g in the same substantially as described and shown.