Textiles: fluid treating apparatus – Machines – Combined operations
Patent
1993-11-23
1995-10-24
Coe, Philip R.
Textiles: fluid treating apparatus
Machines
Combined operations
68158, 68181R, 210404, D21C 102
Patent
active
054600197
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention concerns socalled drum washers, which are used especially for washing pulp suspensions in the cellulose industry.
BACKGROUND OF THE INVENTION
In cylinder washers there is a rotatable cylindrical drum, which is pervious to the washing liquid and onto the case of which 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, entering the drum, from which it is removed by way of the drum end. The washed pulp is worked loose and removed from the case.
Such drum washers are also known wherein the filtrate obtained in a final washing stage-is recovered within the drum with the aid of a special collecting trough. This filtrate is then reused as washing liquid for the initial stage. Such a device is described, for example, in a brochure by the name of Rauma-Repola Pro-feed Pressure Washers, Rauma 1985.
However, it is technically difficult to bring about such collecting trough systems of the said kind, which would operate reliably.
GENERAL DESCRIPTION OF THE INVENTION
The purpose of this invention is primarily to bring about a two-step cylinder washer having a technically reliable but simple system for collecting the filtrate in the final washing step.
The purpose of the invention is achieved by a washer including a cylindrical drum with a case that is permeable to washing liquid but is impermeable to the particles to be washed and has an aperture in an end plate. A shaft is attached to the drum, the shaft having two cones joined together with their bases against one another, and the drum is disposed for rotation in a basin. An assembly conducts a suspension to be washed onto the drum case where the suspension forms a mat, a second assembly conducts washing liquid through the particle mat into the drum, and a third assembly removes washing liquid from inside the drum. The third assembly includes means for removing the filtrate accumulated on a drum bottom and means for separately removing the filtrate obtained in a final washing stage from an upper part of the drum. An additional assembly removes washed pulp from the drum. The other claims present advantageous applications of the invention.
DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION
In the following a cellulose pulp washer according to the invention is described as an example.
In the drawings of the specification
FIG. 1 is an end view of the washer and washing process looking from the end of the washing drum;
FIG. 2 is an axial cross-section of the washer drum;
FIG. 3 shows an end view from the drum end of the second-step washing liquid collecting equipment placed on the drum shaft; and
FIG. 4 shows the other drum end and its washing liquid collecting equipment as seen obliquely from the end.
The main washer components are a basin 1 attached to the body, a filtering drum 2 rotatable within the basin, an assembly 3 for feeding pulp to be washed, an assembly 4 for supplying washing water, piping 5 for circulating washing water, an assembly 6 for removing washing water and an assembly 7 for removing washed pulp.
A cylindrical case 9 permeable to washing water is attached to the shaft 8 within the filtering drum. The shaft ends protrude from the open ends of the drum into bearings mounted on the body. The drum rotates clockwise as seen in FIG. 1.
The case 9 ends have flanges 10. On the exterior side of these there are sealing means 11 matching with the basin ends (FIG. 2).
Pulp 12 to be washed is fed into the basin and through the assembly 13 to an approximate four-five o'clock position in relation to the axis of rotation.
The pulp flow 12 supplied into the basin is guided to form a mat against the drum case 9 with the aid of 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 parallel with the drum shaft. The distance of the guiding plate from the drum periphery can be adjusted by bars 17. A follower plate 18 is loca
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Ojala Alpo
Rosnell Seppo
Coe Philip R.
Sunds Defibrator Pori Oy
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