| 摘要 |
PURPOSE:To enable controlling the air volume by a method wherein an elastic spherical body consisting of fibers and being capable of passing air is placed in a duct and pressed and compressed between hard plates in net form in such a manner as to vary the density with which fibers form the spherical body. CONSTITUTION:An elastic spherical body 11 is held in place by seizure between a pair of hard plates in-net-form 12 and also by fixing in the manner of adhesion or the like at the part in contact with the hard plates in-net-form 12. On the downstream side, a supporting member 13 is diametrically attached to the duct 15 and a cross-shaped reinforcing member 16 is fixed to the hard plate in-net- form 12 on the side of the supporting member 13. A pair of air flow-controlling screws 14 are run through the supporting member 13 and with their forward ends on the reinforcing member 16. When the elastic spherical body 11 is pressed and compressed between the hard plates in-net-form 12, the cross-sectional shape of the elastic spherical body 11, with deformation, changes from a circle to an ellipse and the fiber density increases. |
