| 摘要 |
<p>1,206,290. Ventilators. SOC. D'ETUDES ET DE RECHERCHES DE VENTILATION ET D'AERAULIQUE. 27 Dec., 1967 [5 Jan., 1967; 8 Sept., 1967], No. 58592/67. Heading F4V. [Also in Division F2] A valve for controlling the flow through a domestic ventilation duct has sector shaped closure elements 43a, 43b mounted on a sleeve 40 and movable over the sector shaped openings 33a, 33b in an end wall 32. The sleeve 40 is attached to a wheel 44 carrying vanes 45 and mounted magnetically on the head 39 of a shaft 36 which is biased by a spring 38 to a predetermined valve open position. Increase of flow through the duct acts on the vanes 45 to cause the valve closures to move to regulate the flow. The length of sleeve 40 is sufficient to separate the turbulance fields associated with the closure elements and the vanes respectively. The vanes are surrounded by an annular passage between the duct 31 and the ring 46 formed by the spaces between radial arms 47 which spaces are adjustable by the apertures in a ring 49. In modification the vanes are formed in a room diffuser which is adjustable in height and the vanes are adjustable or auxiliary adjustable vanes in the duct direct the air on to fixed rotatable vanes. In a further embodiment vanes are integral with the valve closure elements and helicoidal ramps separate the respective turbulance fileds.</p> |
