| 摘要 |
PURPOSE:To reduce blown air discharged with dust for facilitating dust container filtration and containment and reduce scattering of dust emitted to the ground by separating a first subsidiary current including dust separated by a first centrifugal separator again by a second centrifugal separator. CONSTITUTION:Exhaust blow including fine dust, etc., is sent from an exhaust blow tube to a first centrifugal separator 27, and a first main current from which dust is eliminated is sent through a blow passage 78 inside a cover 47 to be discharged from an exhaust blow port 49. Exhaust blow penetrating from a connection hole 39 inside a centrifugal separator 36 is rotated by a fixed blade 41, and dust is collected to the inner wall surface of a main body 37 to keep rotating up by centrifugal force to get into an upper chamber 33 from an upper end to be a first subsidiary current with part of blow to get into a second centrifugal separator 51 through a connection hole 67. This first subsidiary current is separated by a centrifugal separator 63, and a second main current from which dust is eliminated is sucked by negative pressure of blow of the first main current flowing from an upper chamber 59 and an exhaust blow tube 77 through the inside of the cover 47 to be combined and discharged. Separated dust is sent from a lower chamber 61 to be a second subsidiary current with part of blow to be discharged through a dust discharge tube 75 to the ground.
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