Rotary drum vacuum filter with a throttling valve

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United States of America Patent

PATENT NO 11980837
APP PUB NO 20210252436A1
SERIAL NO

17252429

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Abstract

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A pulp-filter arrangement (1) comprises a rotatable drum (10) and a non-rotating valve arrangement (30). The rotatable drum (10) has a cylindrical water-permeable pulp-supporting shell (14), a plurality of drain pipes (16) and a rotating hollow shaft (18). The plurality of drainpipes (16) connects the rotating hollow shaft (18) with a collecting channel (22) situated radially directly inside the cylindrical water-permeable pulp-supporting shell (14). The non-rotating valve arrangement (30) is disposed within the rotating hollow shaft (18) for sealing off the rotating hollow shaft (18) from a radially inner outlet (24) of the drain pipes (16) when respective radially inner outlet (24) is situated within a sealed zone. The non-rotating valve arrangement (30) is further arranged to, in a transition zone immediately following the sealed zone, open a throttled passage between the rotating hollow shaft (18) and the radially inner outlet (24).

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Patent Owner(s)

Patent OwnerAddress
VALMET ABSUNDSVALL SUNDSVALL VASTERNORRLAND

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Löfstrand, Anders Sundsvall, SE 2 2
Lundberg, Jörgen Uppsala, SE 10 23
Magnusson, Jonas Sundsvall, SE 8 23
Nykvist, Peter Timrå, SE 2 3
Sundström, Åke Timrå, SE 1 1

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