| 摘要 |
Apparatus is described for separating particulate material from an airstream established by suction. The apparatus comprises a primary separation chamber (12) in which particles are separated from the airstream therein by centrifugal force, a main particle collecting region (14) into which the particles separated by the primary separation can fall under gravity, and a secondary separation chamber (90) downstream of the primary chamber (12), to which air and particles not separated in the first chamber, pass. An air outlet in the secondary chamber allows air substantially free of particles to exit. An intermediate particle collecting region (22) is associated with the secondary chamber, in which particles collect after separation by centrifugal force from the air flowing through the secondary chamber (90). A valve (41) is provided between the intermediate particle collecting (22) region and a second particle collecting region (14), which is closed while air flows through the apparatus but which is opened when airflow ceases, to allow particles in the intermediate region (22) to pass into the second region (14).
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