outlet air damper, ventilation fan

Abstract

The utility model provides an air outlet air valve, ventilation fan, wherein air outlet air valve, including air valve cylinder, the air outlet of air valve cylinder is equipped with first cover plate subassembly and second cover plate subassembly, first cover plate subassembly includes first cover plate, second cover plate subassembly includes second cover plate, first cover plate and second cover plate have the flat backstop state of plugging air outlet and the overturning through -flow state of penetrating air outlet, still include drive arrangement and locking device, drive arrangement is used for driving first cover plate and second cover plate synchronous rotation to realize first cover plate and second cover plate switch between flat backstop state and overturning through -flow state, locking device is used for locking first cover plate and second cover plate under flat backstop state or overturning through -flow state. The utility model can effectively overcome the energy waste of the prior art in the cover plate need fan wind pressure resistance cover plate self weight leads to, and the technical deficiency that air valve opens or closes is unreliable.

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