| 摘要 |
The device comprises a cylindrical filter receiving element (17) provided at the central cover (11), which protrudes into the interior of the collecting basin (10). A similar cylindrical filter (19) is inserted at a distance in the filter receiving element. A safety top (20) is placed on the filter receiving element. The air is sucked by an inlet (12) into the filter receiving element over the suction opening (21) and annulus (24,25) is guided. The annulus has labyrinth-type arrangement, such that the suction property of a collecting basin is independent of the position. |
