Paper making and fiber liberation – Apparatus – Slurry supply conditioning or condition maintaining
Patent
1996-02-09
1999-05-04
Lamb, Brenda A.
Paper making and fiber liberation
Apparatus
Slurry supply conditioning or condition maintaining
162 60, 162 55, D21H 2300
Patent
active
059001232
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for distributing liquid, especially washing liquid for washing paper pulp, in a diffuser having at least one screen plate, comprising means for supplying the washing liquid and at least one elongated nozzle which can be connected to the washing liquid supply means, which projects down in front of the screen plate, and is arranged to supply the liquid.
2. Description of the Prior Art
Such a device is previously known through U.S. Pat. No. 3,348,390 which relates to a liquid distribution device in a diffuser with openings being arranged on two different levels--at the top and at the bottom--along the height of the screen plates. The washing liquid is thereby conveyed in separate conduit systems to the different levels, which results in a complicated system for supplying the washing liquid. In addition, it can give rise to uneven distribution of the washing liquid along the height of the screen plate.
In a further development, the washing liquid is supplied through two nozzles, namely a long nozzle which reaches to the lower part of the screen plate and a short nozzle which is designed to supply washing liquid to the upper part. The washing liquid is distributed to each nozzle by means of a rotatable so-called nozzle plate which is provided with a number of holes, more specifically throttle holes, the cross-sectional area of which is predetermined in relation to the current quantity of liquid passing through the nozzle. An uneven distribution of the liquid along the height of the screen plate also occurs when this device is used.
SUMMARY OF THE INVENTION
The object of the present invention is to produce a device in a diffuser of the type mentioned at the outset, which device is designed, to the greatest possible extent, to provide each part of the screen plate of the diffuser with its share of the washing liquid.
This object is achieved by a device of the type mentioned at the outset in which each of the nozzles is provided with openings for washing liquid which open out at different predetermined levels and that a channel for supplying washing liquid is arranged to each opening in the nozzle.
Preferred embodiments of the device have been given the features which are evident from the subclaims.
Use of the device according to the invention provides better distribution of the washing liquid along the entire height of the screen plate, which, in turn, must improve the efficiency of the machine and prevent local thickening in the screen, which can give rise to an increased requirement for hydraulic power.
BRIEF DESCRIPTION OF THE DRAWING
The invention is described in more detail below with reference to the attached FIG. 1, which shows a preferred embodiment of a screen plate.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a screen plate 1 which is arranged in a diffuser which is not shown. In front of the screen plate 1, a first, elongated distribution nozzle 2 is arranged in such a way that, in the main, it extends with its tip 3 to the lower edge 4 of the screen plate 1. A second, elongated distribution nozzle 5 extends with its tip 6 to immediately above the middle of the height of the screen plate. Both of the distribution nozzles 2 and 5 are designed to be connected to a nozzle plate, which is not shown, for supplying washing liquid to the nozzles via throttle holes, the cross-sectional area of which is predetermined in relation to the current quantity of liquid passing through the connected nozzle.
Each nozzle 2 and 5 is provided with three openings 7, 8, 9 and 10, 11, 12, respectively, which open out at different levels calculated from the tip and upwards, with the three openings 7, 8, 9 on the first nozzle 2 being distributed over the lower half of the screen plate 1 and the three openings 10, 11, 12 on the second nozzle 5 being distributed over the upper half of the screen plate 1. Thus, the washing liquid which flows into the diffuser out of the openings 7 to 12 is distributed evenly
REFERENCES:
patent: 2266223 (1941-12-01), Lund
patent: 3348390 (1967-10-01), Richter
patent: 3776471 (1973-12-01), Meyer et al.
patent: 4043397 (1977-08-01), Glowienke
patent: 4951879 (1990-08-01), Fay et al.
patent: 5027620 (1991-07-01), Richter
patent: 5203045 (1993-04-01), Golston
Opposition by Kamyr Inc. to patent SE 501,863 (appl. No. SE 9303096-3, dated Mar. 5, 1996.
Kvaerner Fulping AB
Lamb Brenda A.
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