| 摘要 |
PURPOSE:To improve the dust collecting efficiency by disposing the influent openings of plural nozzles provided between a jet flow blowing-out opening and a suction opening to the jet flow flowing-out opening, and making the areas of influent openings larger in order as it approaches nearer to the side of the suction opening from the side of the jet flow blowing-out opening. CONSTITUTION:The jet flow blowing-out opening 2 and the suction opening 3 are disposed confronted each other at both ends of the circulation flow passage 1 of closed system with a circulation fan 5 built-in, and a cleaning duct 7 having a cleaning fan 9 and a clean air blowing-out opening 6 is branched off at the suction opening 3. A cleaning filter 4 is provided at least either in the leaning duct 7 or in the circulation duct 1, and plural nozzles 12a-12c are disposed between the jet flow blowing-out opening 2 and the suction opening 3 so as to direct the influent openings 10a-10c to the side of the jet flow blowing-out opening 2. Moreover, the areas of the influent openings 10a-10c are made larger in order as it approaches to the side of suction opening 3 from the side of jet flow blowing-out opening 2. As a result, the dust collecting efficiency is improved with the small suction opening without the turbulence of room air. |
