Patent ID: 7302967
Filing Date: 2007-12-04
Classification: F04D,F16K,F24F,H05K,Y10T

Abstract:
1. A reverse flow preventing device arranged in a flow path of fluid formed by a fan, said device comprising: a frame; a plurality of support shafts arranged about a center of said frame and mounted on said frame; and a plurality of pivotable plate members supported by said support shafts, wherein said frame has a central portion, a peripheral portion arranged about said central portion and spaced apart from said central portion, and connecting portions arranged between said central portion and said peripheral portion, wherein said support shafts are radially arranged on said central portion and said peripheral portion, wherein said plate member has a first plate portion and a second plate portion divided by said support shaft, and said plate member is curved to protrude in the direction of the flow of air produced by said fan, wherein said plate member has a length L and said support shaft is located at a position of L/4 of said plate member.