Improvements in Apparatus for Collecting Paper Pulp from Water.
Year: 1899

page_text: Date of Application, 2nd Nov., 1889-Accepted, 10th Feb., 19001
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COMPLETE SPECIFICATION.
Improvements in Apparatus for Collecting Paper Pulp from Water.
We, GEORGE HUTH, of 28; Queen Street, London, E.C., and JAMES BERTRAM
AND SON, LTD., of Leith Walk Foundry, Edinburgh, Engineer and Machine
Manufacturers, respectively, 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 pulp collectors in which the water still containing
paper fibies 18 conducted along the wall of a conical depositing vessel towards
the point of the cone, whereby a deposition of the major part at the fibres. con-
tained in the water is produced at the point of the cone.
With the object of downwardly conducting the inflowing water in the said
apparatus a partition 18 ananged, at a suitable distance from the wall of the
depositing vessel, which partition shuts of the inflowing water hom the cential
space of the vessel.
Hitherto apparatuses of this kind have been provided with a partition running
light round the whole depositing vessel. Although it was possible by this means
to arrange an inlet passage extending also all round the whole vessel, and thereby
to apparently increase to a maximum the quantitative effective delivery of the
apparatus, the inlet taking place all round also necessitated the arrangement all
round of an outlet for the water freed from fibies. For catching the overflowing
water, a suitable collecting channel also running all round had to be provided.
This collecting channel has hitherto always been arranged above the annular inlet
channel, thus hratly preventing the latter from being inspected, and secondly pro-
ducing a back eddy towards the inlet which tended to reduce the energy of the
inflowing water, and therewith also its permanent downward flow in the depositing
vessel,
1.
In order to avoid this drawback, the inclined partition running all round 18
replaced according to the present invention by a diverting plate or partition
extending for only a portion of the periphery of the vessel, and correspondingly
also the inlet is only carried as far as the extent of this diverting partition,
whilst over the corresponding part of the periphery opposite this diverting par-
tition a separate outlet or overflow edge may be arranged
This arrangement also allows of the overflow passage being arranged at the
same height as the inlet or even lower down, and thus avoiding any back eddy
towards the inlet.
The arrangement also affords without further trouble a free inspection both
of the distributing passage at the inlet, as well as of the collecting passage at
the outlet, which in this case may both be open, whilst in the previous arrange-
ment of the distributing passage for the inlet, it had to be closed on all parts
towards the outside.
Two forms of construction of the improved arrangement are shown in the
accompanying, drawings, in which according to Figures 1 and 2, both the dis-
tributing passage e for the inlet, and also the collecting passage i for the outlet

page_text: are arranged on the outside of and at the upper edge of the depositing vessel a.
Both passages stand diametrically opposite one another at the same height, and
each embrace a portion of the periphery of the vessel, amounting to about 100
to 120° of same The passages are both quite open above. The passage e
communicates with the interior of the depositing vessel through openings f
In front of these openings a diverting plate or partition g is fixed in the interior
of the vessel, which plate extends to a point on the periphery of the vessel
corresponding to the length of the passage e, and descends to a suitable depth, so
that the inflowing water is forced to assume a downwards direction of flow
travelling along the wall of the conical or funnel shaped part of the depositing
vessel,
The space enclosed by the diverting plate 9 is also shut off from the remaining
water space at both ends by suitable walls. The overflow hip situated in the
present instance at the level of the inlet pipe t extends over a part of the periphery
of the vessel opposite to and corresponding with the distributing passage e.
A sieve u is connected with the overflow lip and separates the collecting
passage from the interior of the vessel, and thus serves to retain the largei
Hakes of fibre or other substances which may rise to that level
The approximately equal heights of the overflow hip d' and the inlet pipe t,
and also the restriction of the inlet passage on the one hand and the outlet
passage on the other hand to one part each of the periphery of the vessel at
opposite sides prevents an eddying back of the inflowing water and thus any
diminution of the active force with which this water flows in the downwardly
diverted direction, and moreover the water in the container is comparatively
easily caused to assume in the one half a downwardly directed, and in the other
half an upwardly directed flow, thus excluding the formation of whulpoola
which act deleteriously on the deposition of the pulp fibres, such whulpools
being easily formed when the inflow takes place all found.
Consequently in the present invention there takes place much more easily a
deeper descending flow of the water, and therewith an increased deposition of
the fibres held in suspension
In the modification shown in Figures 3 and 4, both passages e and are
airanged on the inside of the depositing vessel, whilst the openings of the
distributing passage e are arranged in the bottom of the same, and the diverting
plate or partition 9 18 arranged parallel to the comparatively high cylindrical
upper part d of the depositing vessel.
The partition g may of course also have an inclined position, but this 18 of
comparatively small importance for the working, as it 18 only essential that the
inflowing water be conducted in any case to a suitable depth below the water
level in order thereby to impart to it a direction of flow in a downward direction.
In order if necessary to enable the depth of immersion of the partition g to be
changed, the partition is provided at the side with folded over edges, in which
18 mounted a sheet metal plate & which beais against the partition g and is
vertically movable. If the plate 6 as shown in Figure 3 be pushed somewhat
downwards the guidance of the water between the wall of the vessel and the
partition is prolonged and the water thus receives a more certain and longer
downwardly directed flow. This 18 of advantage when the amount of fibrous par-
ticles contained in the water is less than usual.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim 18:-
1. A pulp collector in which the diverting plate or partition (9) and also the
distributing passage (e) which has inlet openings (f), are extended for only a
portion of the periphery of the depositing vessel with the object of avoiding any
backward eddy towards the inlet, and any whirlpool currents at the point of
the deposition vessel, and in which the outlet or overflow (d) is arranged approxi-

page_text: mately at the height of the water inlet opposite the diverting partition and to a
corresponding extent or length, substantially as hereinbefore described.
2 In a pulp collector of the kind described, providing the diverting plate or
partition (9) with an extension plate (b) adapted to be pushed downwards in
such a way that the depth to which the downflowing water must descend beneath
the water level can be regulated according to the condition of the water sub-
stantially as described.
Dated this 1st day of November 1899.
W. P. THOMPSON & Co.,
Of 6, Lord Stret, Liverpool, Agents for the Applicants.