Shutter device

Abstract

Provided is a shutter device having a fail-safe function to prevent occurrence of overheating even when an actuator becomes inoperable. The shutter device includes a shutter valve ( 11 ) which opens and closes an air port, a lever ( 14 a ) having one end connected to a rotating shaft ( 16 ) of the shutter valve and the other end connected to an actuator ( 12 ), and biasing means which biases the shutter valve in an opening direction. Opening/closing of the shutter valve is controlled by the actuator rotating the lever when opening of the shutter valve is between the fully-open and predetermined opening, and the shutter valve is closed by wind pressure of travelling wind when the opening of the shutter valve is between the predetermined opening and the fully-closed.

1 . A shutter device, comprising:
 a shutter valve which opens and closes an air port;   a lever having one end connected to a rotating shaft of the shutter valve and the other end connected to an actuator; and   biasing means which biases the shutter valve in an opening direction,   wherein opening/closing of the shutter valve is controlled by the actuator rotating the lever when opening of the shutter valve is between the fully-open and predetermined opening, and the shutter valve is closed by wind pressure of travelling wind when the opening of the shutter valve is between the predetermined opening and the fully-closed.   
     
     
         2 . The shutter device according to  claim 1 ,
 wherein the biasing means is a return spring which is arranged at a connection position between the lever and the rotating shaft.   
     
     
         3 . The shutter device according to  claim 1 ,
 wherein connection between the rotating shaft and the lever is performed owing to that a convex portion which is arranged at a side face of the shutter as being shorter than an elongate hole formed at the lever is fitted to the elongate hole,   the biasing means is formed of the elongate hole and the convex portion, and   the shutter valve is biased to the lower side of the elongate hole due to own weight.   
     
     
         4 . The shutter device according to  claim 1 , further comprising a plurality of the shutter valves, and a linkage mechanism which interlocks rotating shafts of the adjacent shutter valves,
 wherein the lever and the biasing means are arranged at least at a single shutter valve in common or a single shutter valve for each thereof so that the shutter valves are rotated as being interlocked.   
     
     
         5 . The shutter device according to  claim 4 ,
 wherein the linkage mechanism is configured so that the levers connected to the rotating shafts are connected by a rod.