Textiles: fluid treating apparatus – Machines – Combined operations
Patent
1993-11-23
1995-06-06
Stinson, Frankie L.
Textiles: fluid treating apparatus
Machines
Combined operations
68181R, 68158, 210404, 162 60, 162329, 162380, D21C 102
Patent
active
054211760
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention concerns so-called drum washers, which are used especially for washing pulp suspensions in the cellulose industry.
BACKGROUND OF THE INVENTION
Drum washers have a rotatable cylindrical drum, which is permeable to washing liquid and onto the case of which the pulp to be washed is fed constantly to form a mat. Washing liquid is conducted onto the top of the mat and it then passes through the mat and the case and enters the drum, from which it is removed through the drum end. The washed pulp is worked loose and removed from the periphery.
Drum washers are known wherein a mat is formed on the case and in the lower drum part with the aid of a special compression plate assembly. In this way the washing zone in the drum is lengthened. Such a washer is described e.g. in patent specification FI-C-55370.
GENERAL DESCRIPTION OF THE INVENTION
The purpose of this invention is above all to bring about a drum washer with as long a washing step as possible which works without disturbances.
This purpose is achieved by the apparatus described herein. Advantageous applications of the invention are presented.
DETAILED DESCRIPTION OF THE DRAWING FIGURES
In the following a cellulose pulp washer in accordance with the invention is described as an example.
In the appended drawings
FIG. 1 shows an end view of the washer and of the washing process as seen from one end of the washing drum,
FIG. 2 is an axial cross-section of the washer drum, and
FIGS. 3a and 3b show an ,enlarged view of a detail of the washer's compression plate assembly as seen from one end of the drum.
DETAILED DESCRIPTION
The main components of the washer are a basin 1 attached to the body which has a rotatable filtering drum 2, a feeding assembly 3 for the pulp to be washed, a washing water feeding assembly 4, a washing water circulation piping 5, an assembly 6 for removing washing water and an assembly 7 for removing washed pulp.
The filtering drum has a cylindrical case 9 permeable to washing water and mounted on the shaft 8. The shaft ends protrude from the open ends of the drum into bearings attached to the body. The drum rotates clockwise as seen in FIG. 1.
The case 9 ends are provided with flanges 10. Their exterior side carries sealing means 11 matching with the basin ends (FIG. 2).
Pulp to be washed is supplied into the basin and by way of an assembly 13 to an approximate four-five o'clock position in relation to the axis of rotation.
The pulp flow 12 fed into the basin is guided to form a mat against the drum case 9 by a guiding plate 14 which is parallel with the case. The front end of the guiding plate is journalled tightly in the bottom wall 15 of the basin on a shaft 16 which is coaxial with the drum shaft. The distance between guiding plate and drum periphery is adjustable by using bars 17. A follower plate 18 is located after the guiding plate. Its back end is journalled tightly in a partition wall 19 on a shaft 20. The partition is located in an approximate eight-nine o'clock position in the drum's direction of rotation. The distance between follower plate and drum periphery is adjustable by using bars 21. A gap 22 is left between the plates.
The bottom wall 15 of the basin, the guiding plate 14, the follower plate 18 and the partition 19 form a washing water feeding space 23. Washing water is supplied to this space by way of an assembly 24. The washing water flows through gap 22 onto the pulp mat and further through this and through the drum periphery and enters the drum.
The back edge of guiding plate 14 is extended by a flexible lip 25 which presses on the follower plate 18 from the drum side. The lip functions in gap 22 as a flap valve which prevents pulp from entering the washing water feeding space 23. Below the lip there are lip supporting forks 26, which are articulated to the follower plate. Their free ends are located on top of the guiding plate extension.
A pulp mat compression plate 28 forms an extension to the follower plate 18.
The upper part of the basin is closed tightly by a hood 27.
The botto
REFERENCES:
patent: 3772144 (1973-11-01), Luthi et al.
patent: 3878698 (1975-04-01), Friksson et al.
patent: 4085003 (1978-04-01), Luthi
patent: 4217170 (1980-08-01), Luthi
patent: 4266413 (1981-05-01), Yli-Vakkuri
patent: 4769986 (1988-09-01), Kokkonen et al.
patent: 4952314 (1990-08-01), Henricson et al.
patent: 5046338 (1991-09-01), Luthi
Karke Reima
Ojala Alpo
Rosnell Seppo
Stinson Frankie L.
Sunds Defibrator Pori Oy
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