| 摘要 |
PCT No. PCT/GB93/01325 Sec. 371 Date Apr. 17, 1995 Sec. 102(e) Date Apr. 17, 1995 PCT Filed Jun. 24, 1930 PCT Pub. No. WO94/00046 PCT Pub. Date Jan. 6, 1994A vacuum cleaner including a dirty air inlet (12, 14) communicating with a clean air outlet by way of an airflow path has a cyclone (18) arranged in the airflow path. In use, air flowing along the airflow path from the dirty air inlet (12, 14) to the clean air outlet passes through the cyclone (18). At least one bleed valve (20) is arranged in the wall of the airflow path upstream of the cyclone (18). Preferably, three bleed valves (20) are located in the wall of the airflow path and, more preferably, the bleed valves (20) are substantially identical to one another. Control may be provided for controlling the amount of air bled through the bleed valve (76) when a single bleed valve is provided.
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