| 摘要 |
PURPOSE: An assembly of fan and shroud is provided to increase blast capacity by varying an inflow area or an outflow area for flowing air current into the fan. CONSTITUTION: An assembly(30) includes a shroud(33) having more than two fan installation parts(31,32); fan assemblies(40,40') including motors(43,44) and fans(41,42) driven by the motors and installed to the fan installation parts, respectively; an air current guiding wall(34) installed on an edge of the shroud; a separating wall(35) installed on an inlet side or an outlet side of the shroud to set limits to a current inflow area or a current outflow area of the fans together with the current guiding wall; and at least one opening and closing device(50) forming a part of the separating wall and varying the inflow area or the outflow area of the fans.
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