专利名称：IMPROVEMENTS RELATING TO
VENTILATORS
发明人：RAYMOND ALFRED FRANK BURTENSHAW申请号：AU7638181申请日：19811015公开号：AU7638181A公开日：19820422
摘要：A powered, direct discharge ventilator comprises a base (B) having an extractionfan duct defined by a cylindrical wall portion (11) enclosing a fan impeller (not shown) ofa fan (K) mounted on the base. A shallow windshield (D) shelters a non-return shutter (S)which closes the extraction fan duct when the fan is not operating. The shutter (S) ishinged on a pair of arms (H) to float up on the discharging airstream to take up theposition shown chain-dotted in Fig. 1 when the fan is operated. When the fan is stopped,the shutter (S) closes gravitationally. To assist in holding the shutter (S) closed under highwind conditions, a wind deflector (W), carried by a bird-guard (G), directs the wind in adownwardly directed stream onto the top of the shutter (S). Where a much higherwindshield is used, the wind deflector acts in a similar manner to prevent any reduction ofpressure within the windshield due to the <> lifting the non-return shutter.
申请人：COLT INTERNATIONAL LTD.
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