Helical filter candle including evenly spaced turns and compress

Details Helical filter candle including evenly spaced turns and compress Helical filter candle including evenly spaced turns and compress

1996-11-26

1998-08-11

Walker, W. L.

Liquid purification or separation

Filter

With movable means to compress medium

210356, 210357, 2104971, 2103232, 298966, 2989661, 2989662, B01D 2948

Patent

active

057923531

ABSTRACT:
In order to avoid dead spaces which are difficult to subject to backflushing and in which particles can be deposited, a special helical filter candle, a method of manufacture of said helical filter candle as well as an end portion (11) for a helical filter candle (1) is created. The helical filter candle (1) comprises a wire (2) wound in windings (3) onto a support structure (4) of support rods (5). At one end, an end portion (11) is welded to said support rods (5). The last of the windings (3) is ground flat in such a way that a spacing of uniform width arises between the surface of the end portion (11) and the final winding (3). During manufacture of the helical filter candle (1), the wire is wound onto the support rods (5) in windings (3), wherein the spacing (7) between the individual windings in a middle area (6) of the support rods (5) is less than in an end area (8) of approximately 3 to 5 windings. On welding of the end portion (11) onto the support rods (5), the end area (8) of said support rods (5) is heated, and shortened through the force applied. After welding, the spacing between the windings over the entire length of the filter candle (1), i.e. both in the middle area (6) and the end area (8), possesses the same spacing width.

REFERENCES:
patent: 2654124 (1953-10-01), Layte
patent: 2682309 (1954-06-01), Banchback
patent: 2729294 (1956-01-01), Adams
patent: 3975274 (1976-08-01), Nommensen
patent: 4365669 (1982-12-01), Wagner et al.
patent: 4742872 (1988-05-01), Geske
patent: 4804481 (1989-02-01), Lennartz
patent: 5207930 (1993-05-01), Kannan

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