| 摘要 |
PCT No. PCT/GB89/01115 Sec. 371 Date Mar. 21, 1991 Sec. 102(e) Date Mar. 21, 1991 PCT Filed Sep. 21, 1989 PCT Pub. No. WO90/03212 PCT Pub. Date Apr. 5, 1990.An apparatus for removing contaminants from a liquid comprises a casing and a tubular filter dividing the casing into two compartments. The tubular filter is formed of fibers attached at each end to end supports which are movable axially relative to one another and rotable relative to one another about the longitudinal axis of the filter. A helical spring is disposed within the tubular filter and is so dimensioned that it does not close when the end supports are in their closest operational position. The spring resists inward movement of the fibers when the end supports are moved axially towards each other and rotated to twist the fiber, thereby preventing the compartment defined by the interior of the tubular filter from tending to close.
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