Fan

Abstract

Provided is a fan of a microwave oven. The fan, discharging air in two directions, cools a plurality of components. Thus, the components are cooled with more simple configuration.

1 . A fan comprising:
 a fan housing including at least one intake part and at least two discharge parts; and   a rotatable blower in the fan housing the blower introducing air through the intake part and discharging the air through the discharge part,   wherein minimum distances (D 1 )(D 3 ) between an inner surface of the fan housing and an cuter surface of the blower in upstream ends of the discharge parts in a rotation direction of the blower are greater than minimum distances (D 2 ) (D 4 ) between the inner surface of the fan housing and the alter surface of the blower in downstream ends of the discharge parts, and   the minimum distance (D 1 )(D 3 ) between the inner surface of the fan housing and the cuter surface of the blower in the upstream end of one of the discharge parts in the rotation direction of the blower is greater than the minimum distance (D 2 )(D 4 ) between the inner surface of the fan housing and the cuter surface of the blower in the downstream end of another of the discharge parts adjacent in an opposite direction to the rotation direction of the blower.   
     
     
         2 . The fan according to  claim 1 , wherein a central angle (A 1 )(A 3 ) of one of the discharge parts in the rotation direction of the blower with respect to a rotation center of the blower is equal or less than a central angle (A 4 )(A 2 ) between the upstream end of the selected discharge part and the downstream end of another of the discharge parts adjacent in the opposite direction to the rotation direction of the blower. 
     
     
         3 . The fan according to  claim 1 , wherein a ratio of air discharged through the discharge parts is controlled by controlling a difference in the minimum distances between the inner surface of the fan housing and the outer surface of the blower in the upstream ends or the downstream ends of the discharge parts. 
     
     
         4 . The fan according to  claim 1 , wherein a ratio of air discharged through the discharge parts is controlled by controlling a difference between the minimum distance between the inner surface of the fan housing and the cuter surface of the blower in the downstream end of one of the discharge parts, and
 the minimum distance between the inner surface of the fan housing and the outer surface of the blower in the upstream end of another of the discharge parts adjacent in the opposite direction to the rotation direction of the blower.   
     
     
         5 . The fan according to  claim 1 , wherein a ratio of air discharged through the discharge parts is controlled by controlling a central angle of one of the discharge parts in the rotation direction of the blower with respect to a rotation center of the blower. 
     
     
         6 . The fan according to  claim 1 , wherein a ratio of air discharged through the discharge parts is controlled by controlling a central angle between the upstream end of one of the discharge parts and the downstream end of another of the discharge parts adjacent in the opposite direction to the rotation direction of the blower. 
     
     
         7 . A fan comprising:
 a fan housing including at least one intake part and at least two discharge parts; and   a rotatable blower in the fan housing the blower introducing air through the intake part and discharging the air through the discharge part,   wherein cross-sectional flow areas between an inner surface of the fan housing and an cuter surface of the blower in upstream ends of the discharge parts in a rotation direction of the blower are greater than cross-sectional flow areas between the inner surface of the fan housing and the outer surface of the blower in downstream ends of the discharge parts, and   the cross-sectional flow area between the inner surface of the fan housing and the outer surface of the blower in the upstream end of one of the discharge parts in the rotation direction of the blower is greater than the cross-sectional flow area between the inner surface of the fan housing and the outer surface of the blower in the downstream end of another of the discharge parts adjacent in an opposite direction to the rotation direction of the blower.   
     
     
         8 . The fan according to  claim 7 , wherein a central angle (A 1 )(A 3 ) of one of the discharge parts in the rotation direction of the blower with respect to a rotation center of the blower is equal or less than a central angle (A 4 )(A 2 ) between the upstream end of the selected discharge part and the downstream end of another of the discharge parts adjacent in the opposite direction to the rotation direction of the blower. 
     
     
         9 . The fan according to  claim 7 , wherein a ratio of air discharged through the discharge parts is controlled by controlling a difference in the cross-sectional flow areas between the inner surface of the fan housing and the outer surface of the blower in the upstream ends or the downstream ends of the discharge parts. 
     
     
         10 . The fan according to  claim 7 , wherein a ratio of air discharged through the discharge parts is controlled by controlling a difference between the cross-sectional flow area between the inner surface of the fan housing and the cuter surface of the blower in the downstream end of one of the discharge parts, and the cross-sectional flow area between the inner surface of the fan housing and the cuter surface of the blower in the upstream end of another of the discharge parts adjacent in the opposite direction to the rotation direction of the blower. 
     
     
         11 . The fan according to  claim 7 , wherein a ratio of air discharged thrash the discharge parts is controlled by controlling a central angle of one of the discharge parts in the rotation direction of the blower with respect to a rotation center of the blower. 
     
     
         12 . The fan according to  claim 7 , wherein a ratio of air discharged through the discharge parts is controlled by controlling a central angle between the upstream end of one of the discharge parts and the downstream end of another of the discharge parts adjacent in the opposite direction to the rotation direction of the blower.