Motor-operated fan apparatus

Abstract

A motor-operated fan apparatus is made up of a brushless motor and a centrifugal fan. The brushless motor has: a rotary shaft vertically disposed on a substrate in a rotatable manner; a stator disposed coaxially with the rotary shaft; and a rotor integrally disposed on the rotary shaft. The centrifugal fan has: a disk part which covers the brushless motor and is fixed to the rotary shaft; and a multiplicity of vane parts which are disposed so as to be elongated from an outer edge of the disk part. A ventilation control member is provided in a space between the rotor and the disk part to block the air flowing from the substrate side to the space between the rotor and the disk part.

1 . A motor-operated fan apparatus comprising:
 a brushless motor having: a rotary shaft vertically disposed on a substrate in a rotatable manner; a stator disposed coaxially with the rotary shaft; and a rotor integrally disposed on the rotary shaft so as to be rotatable about the stator at a given distance to the substrate;   a centrifugal fan having: a disk part which covers the brushless motor and is fixed to the rotary shaft; and a multiplicity of vane parts which are disposed so as to be elongated from an outer edge of the disk part in an axial direction;   wherein the rotor has formed therein an exhaust opening for discharging the air passing from a substrate side through a clearance between the stator and the rotor;   wherein the disk part has formed therein a ventilation opening for allowing the air through the exhaust opening to flow therethrough; and   wherein a ventilation control member is provided in a space between the rotor and the disk part to block the air flowing from the substrate side to the space between the rotor and the disk part.   
   
   
       2 . The motor-operated fan apparatus according to  claim 1 , wherein the ventilation control member is integrally formed with one of the rotor and the disk part. 
   
   
       3 . The motor-operated fan apparatus according to  claim 1 , wherein the ventilation control member is disposed to bridge the substrate side portion of the exhaust opening and the substrate side portion of the ventilation opening.