| 摘要 |
PROBLEM TO BE SOLVED: To provide a damper gear which is profitable to downsizing and in which a system to open and close a cover body brings a little influence to a passage.SOLUTION: A damper gear 1 is constituted integrally with a fan unit 101 attached to an end of a duct 100. The damper gear 1 comprises a cover body 2 arranged facing to an opening 104, and a cover body driving gear 3 moving the cover body advance or retreat to a center axis L direction. The cover body driving gear 3 comprises a drive unit 40 and a screw member 30 turned by the drive unit 40, and the drive unit 40 and the screw member 30 are provided in a range overlapping to an axial flow blade 103 of the fan unit 101 to the central axis L direction. Therefore, there is no need to get a space to arrange the screw member 30 and the drive unit 40 in an external circumference side of the opening 104 and it is profitable to downsize the damper gear 1. Besides, the screw member 30 and the drive unit 40 bring a little influence to a passage, and fluid flow has a little danger to be disturbed. |
