| 摘要 |
This device is provided with a suction fan and has a housing (1) in which a plurality of superposed filter elements (12, 14) is accommodated. A suction branch for the medium to be purified is provided in the lower housing region, and an outlet opening (20) for the purified medium is provided on the upper side of the housing. Below the lowest filter element (12) there is a pre-precipitation chamber, in which the suction fan is located. The superposed filter elements (12, 14) preferably consist of three filters, namely a pre-filter (12), a main filter and an after-filter (14), which can be replaced without great technical effort - for the pre-filter (12) and/or the main filter, a frame (15, 16) can be provided for this purpose, which can be inserted into the housing (1) from the side, and for the after-filter (14) a frame (17) can be provided which rests on a housing shoulder. In a preferred embodiment, the outlet opening (20) for the purified medium is provided in a housing hood (18) which, sealed under the action of its own weight, rests on the after-filter (14) or the frame (17) thereof. The device is preferably used for extracting and purifying welding fumes. <IMAGE>
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