Improvements in Machines for Separating Dust from Air.
Year: 1891

page_text: Date of Application 31st Jan., 1891
Complete Specification Left. 31st Oct., 1891-Accepted, 5th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in Machines for Separating Dust from Air.
I PIETER VAN GELDER of Sowerby Bridge, in the County of York, Milling
Engineer do hereby declare the nature of this invention to be as follows:-
All
This invention has for its object an improvement in dust collectors on the vortex
principal such for instance as that described in my Patent No. 20030 of 1889.
the dust collectors on this principle up to the present date I believe have been circular
in section.. I made a slight innovation in making the cylindrical portion of the
chamber corrugated in order to enable the dust to settle in the corrugations and
slide down. I find however that these corrugations impede the air so much as to
cause loss of power and also the dust collects in a considerable quantity before it
can slide down and then goes down collectively scattering into the air. The corru-
gations & indeed the circular apparatus are both costly as they have to be made in
metal, wood being quite out of the question for that shape. Now I have discovered
that if the apparatus be made polygonal in a transverse section preferably a regular
polygon of about twelve sides very greatly improved results ensue, the dust collects
in the corners but is continually being shaken by the passing wind and therefore
only collects to a very small extent but is continually travelling down the angles.
The wind is very much less impeded so that I can do nearly double the amount of
work with the same apparatus and lastly the cost of producing the machine is
greatly lessened as it can be made of wood. The polygonal sides being each of them
Hat and therefore require no shaping.
I still find that two or more machines one on the top of the other and dipping
into the other is the best form, the twelve sided truncated pyramid of the upper
chamber dipping into the lower chamber to about ths the depth of the prismatic
portion corresponding to the cylindrical portion in the former machine.
If however
a single chamber be used a similar truncated pyramid (a cone will do nearly as well)
but extending to about the bottom of the prismatic portion corresponding to the
cylindrical portion in the former machine, is used and having about the same area
of orifice as the tangential orifice for admission.
In giving the above dimensions I have simply set forth what appeared to be good
from my experimental machines. I do not however bind myself to them..
Dated this 30th day of January 1891.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Machines for Separating Dust from Air.
I, PIETER VAN GELDER, of Sowerby Bridge, in the County of York, Milling
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 has for its object an improvement on my Patent No. 20030 of 1889.
All other dust collectors on the vortex principle up to the present date, I believe,
have been circular in section. I made a slight innovation in making the cylindrical
portion of the chamber corrugated in order to enable the dust to settle in the corru-
gations and slide down. find, however, that these corrugations impede the air
somewhat and cause loss of power, and also the. dust collects in a considerable
quantity before it can slide down, and then goes collectively scattering into the air.

page_text: The corrugations, and indeed the circular apparatus, are both costly, as they have
to be made in metal, wood being quite out of the question for that shape. Now I
have discovered that, if the apparatus be made polygonal in a transverse section,
preferably a regular polygon of about twelve sides, very greatly improved results
ensue. The dust collects in the corners, but is continually being shaken by the
passing wind and, therefore, only collects' to a very small extent, but is continually
travelling down the angles. The wind is very much less impeded so that I can do
nearly double the amount of work with the same apparatus, and, lastly, the cost of
producing the machine is greatly lessened, as it can be made of wood. The polygonal
sides, being each of them flat, require no shaping.
I still find that two or more chambers one on the top of the other, and dipping into
the other, is the best arrangement, the twelve sided truncated pyramid of the upper
chamber dipping into the lower chamber to about the depth of the prismatic
portion corresponding to the corrugated cylindrical portion in the former invention.
If, however, a single chamber be used, a similar truncated pyramid (a cone will
do nearly as well) but extending to about the bottom of the prismatic portion
(corresponding to the corrugated cylindrical portion in the former machine), is
used and having about the same area of orifice as the tangential orifice for
admission.
Figure 1 shows a vertical section;
Figure 2 a plan of apparatus, the framing supporting the same being removed.
A, is tangential inlet; B, exit; C, regulator; d, adjusting screw of regulator;
D D D³, three polygonal prismatic chambers; J J2 J3, three pyramidal hoppers;
E, exit hopper; G, exit for dust to which a sack is usually attached to collect same;
H, mouths of upper hoppers.
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
The improvement in machines for separating dust from air which consists in
forming a vortex machine of polygon instead of circular or corrugated circular
horizontal section substantially as described.
Dated this 30th day of October 1891.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.