| 摘要 |
<p>A local exhaust device which is disclosed comprises a driving portion, a swirler, a first guide member, and a second guide member. The swirler comprises: a base member, which is arranged near an aspiration end of an exhaust pipe, is connected to the driving portion, and is provided, at the center area thereof, with an air aspiration hole communicating with the exhaust pipe; a plurality of upper blades arranged on the upper surface of the base member for generating a first airflow that forms a first vortex; a plurality of connection holes penetratingly formed on the base member for communicating the upper portion with the lower portion of the base member; and a plurality of lower blades arranged on the rear surface of the base member for generating a second airflow that forms a second vortex. The first guide member is arranged so as to surround the circumference of the plurality of upper blades, so that an air curtain formed by the first vortex is expanded, by guiding the first vortex downward, and the second guide member is arranged so as to surround the circumference of the plurality of lower blades, so that an air curtain formed by the second vortex is expanded, by guiding the second vortex downward.</p> |
