| 摘要 |
PCT No. PCT/GB95/01636 Sec. 371 Date Jan. 17, 1997 Sec. 102(e) Date Jan. 17, 1997 PCT Filed Jul. 12, 1995 PCT Pub. No. WO96/05128 PCT Pub. Date Feb. 22, 1996A fluidising unit (1) comprising a supply duct (2) which is arranged to be fed with liquid under pressure, and a discharge duct (5) within the supply duct and projecting beyond the outlet of the supply duct. The end of the supply duct (2) is closable when the fluidising unit is not in use. A screen (9) is associated with the supply duct (2), the screen having at least one oblique opening (10), and being positioned so that liquid passing through the supply duct passes through the or each opening in the screen and is caused to swirl.
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