| 摘要 |
Device for sucking in and discharging gases or fumes comprising lower elements (5) and upper elements (6) associated by members (7), a passage (8) between the elements (5, 6) in a general Venturi shape, and a pipe (9) passing through the lower element (5) and opening in the passage (8), characterised in that it also comprises, in combination, means (22) of driving a gaseous fluid which promotes the sucking in and the discharge of the gases or fumes and comprises means (23) of feeding with gaseous fluid, means of circulating the gaseous fluid in the form of a channel (24) which are associated with the means of feeding (23) and end in means (25) of distribution directed towards the passage (8). <IMAGE>
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