| 摘要 |
PURPOSE:To have perfect prevention of counterflow in an air conditioner by furnishing an orifice plate in the duct and by retaining the damper floatingly. CONSTITUTION:A ring-shaped groove 25 enhances the sealing performance between the opening 21 of an orifice and a damper 30 by housing a ring-shaped projection 31 of the damper 30. This damper 30 is retained by a floating arm 35 so as to float with the aid of said ring-shaped projection 31 even if the wind in the specified direction is weak. When wind is stopped or a counterstream flows in, the projection 31 is housed by the ring-shaped groove 25 at the surface of orifice plate 22 to secure high sealing performance between damper 30 and opening 21 of the orifice. |
