Improvements in. Continuous Mechanical Filters for Chemical or other purposes.
Year: 1890

page_text: Date of Application, 14th Mar., 1890
Complete Specification. Left, 14th Jan., 1891--Accepted, 7th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in. Continuous Mechanical Filters for Chemical or
other purposes.
HARRY YEOMANS, Victoria Road, Northwich, Cheshire, Engineer, do hereby
declare the nature of this invention to be as follows :-
A cylinder of filtering medium composed of flannel wire gauze or other suitable
material, placed with its axis vertical, & having a close fitting screw working in
the same. The cylinder of filtering medium to be encased in a larger cylinder of
wrought iron or other suitable material, & the joints made perfectly between the
two cylinders. The aforementioned screw shaft to be hollow & perforated (or the
perforations may be in the screw blade which may be made hollow) so that a force of
water or other liquid injected into the shaft may travel through the perforations in
shaft or screw blade, & so through the sediment left after filtering. A. vacuum
may be formed in the space between the cylinders which causes the liquid in the
material to be filtered to pass through the filtering medium, the liquid to be drawn
from between the cylinders by a pump or other means. The sediment left after
filtering is worked up by the screw into a horizontal creeper by which it is trans-.
ported to any receptacle provided.
CALL 1000
COMPLETE
SPECIFICATION.
Improvements, in Continuous Mechanical Filters for Chemical or
other purposes.
J
I, HARRY YEOMANS, of Victoria Road, Northwich, in the County of Chester, 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 and purpose the continuous filtration of chemical
muds or mixtures of solid and liquid substances, such for instance as bicarbonate of
soda as it comes from the carbonators in the ammonia soda process.
The drawings hereunto annexed set forth the apparatus in the most approved
form at present known.
Referring to the drawings:
A, is a cylinder of any suitable filtering medium such for instance as canvas,
flannel, wire gauze, felt or a combination of these with or without a perforated
metal back.
This cylinder is placed preferably with its axis vertical and in the axis of this
cylinder is a hollow shaft B having a helix thereon closely fitting the interior of
cylinder A. The shaft B is preferably foot-stepped in the bottom of cylinder A as
shown and driven from above, being supported in any convenient bearings above.
This is not set forth in the drawings which are diagrammatical. The shaft is driven
by gearing such as D and is supplied with water or other fluid by means of a pipe E
which fluid can be caused to enter the cylinder through a series of perforations G.
The cylinder A is cased in a larger-cylinder H of wrought or cast iron or other
suitable material, the question of material being to a large extent decided by the
nature of the substance to be operated upon. The two cylinders are securely
jointed at the bottom. I is a pipe entering the cylinder A supplying the mud or
mixed liquid and solid matter to be filtrated. J is a pipe leading from cylinder H
carrying away the liquid which has passed through the filter, and, where gases are
I Prins 621

page_text: also mechanically mixed with the liquid, a third pipe K may be employed to carry
these away to a condenser. L is a shute leading to worm M. This shute can if
desired be provided with a worm and this is necessary where the shute is horizontal ;
if, however, it be inclined as set forth in the drawings a second worm is not required.
I may, however, place worm M horizontally immediately above the cylinder A in
the manner set forth in dotted lines in the drawings. Similarly I may, if desirable,
drive the central shaft from below and introduce water from below as also shown in
dotted lines, but this is not to be recommended as a rule. Further, in place of
admitting the water from the perforations G at one point, I may place the perfora-
tions at several points or even in the blades of the screw.
For ordinary purposes, however, I find that the water is best injected at the point
shown. The space between cylinders H and A can, if desirable, be divided by
horizontal partitions with different and separate pipes brought from each division.
This also, however, is only useful in rare cases.
The mode of action is as follows:-
:-
These
The liquid mud being emptied through pipe I into cylinder A and shaft B being
rotated in the directions set forth by the arrows, the liquid and gases rapidly per-
colate through cylinder A. into cylinder H. The solid particles are continually raised
up by the screw but the liquid rapidly runs down again. The continual working
of the screw causes the solid material to mount past the perforations G.
latter supply pure water or other washing fluid which still further washes any of
the original liquor from the salt or other solid material and the latter is gradually
pressed upwards, as it rises higher and higher it is still further dried, and finally
is discharged into spout L and from there into the worm M from whence it is
carried to the drying chamber or other desired position. In order to assist filtration,
a more or less complete vacuum can be maintained in cylinder Hand the gases
and liquid respectively can-be drawn by pumps from the pipes K and J.
To enable the central shaft and helix to be easily withdrawn, the former can be
formed in two or more pieces socketed, joined-or-coupled-together_in_any_well
known manner, as shown for instance at Q.
Having now particularly described and ascertained the nature of the said inven-
tiou, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a continuous filter, the combination of a cylinder, cone or equivalent circular
compartment having walls of filtering material and an internal revolving helix or
elevator having an upward action on solid matter with mechanism for actuating the
same, means for supplying the material to be filtered to the filtering compartment
and for carrying away the filtrant from the outside of the same.
2. In combination with a filter such as described, each of the following substan-
tially as described.
(a) Means for injecting water or other fluid for washing purposes.
(b) A continuation upwards of the filtering cylinder beyond the injection orifices
whereby the solid material is dried.
(c) A worm or shute above (into which the filtering cylinder enters) for
carrying off the solid material.
فيمد
T
1001
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.