Blowing device and vacuum cleaner provided with same

Abstract

A blowing device includes a motor including a rotor rotatable about a central axis extending in an up-down direction, an impeller fixed to the rotor and rotatable together with the rotor, a motor housing on a radial direction outer side with respect to the motor and housing at least a portion of the motor, a blower case on the radial direction outer side with respect to the motor housing, and connection portions that connect the motor housing and the blower case to each other in the radial direction. The connection portions include a first connection portion with a communication hole that communicates an inner portion of the motor housing and an outer portion of the blower case to each other.

What is claimed is: 
     
         1 . A blowing device comprising:
 a motor including a rotor rotatable about a central axis extending in an up-down direction;   an impeller that is fixed to the rotor and that is rotatable together with the rotor;   a motor housing that is disposed on a radial direction outer side with respect to the motor and that houses at least a portion of the motor;   a blower case disposed on the radial direction outer side with respect to the motor housing; and   a plurality of connection portions that connect the motor housing and the blower case to each other in the radial direction; wherein   the plurality of connection portions include a first connection portion including a communication hole that communicates an inner portion of the motor housing and an outer portion of the blower case to each other.   
     
     
         2 . The blowing device according to  claim 1 , wherein an opening region at a radial direction inner end of the communication hole overlaps a portion of the motor in the radial direction. 
     
     
         3 . The blowing device according to  claim 2 , wherein
 the motor further includes a stator disposed on a radial direction outer side of the rotor; and   the opening region at the radial direction inner end of the communication hole overlaps a portion of the stator in the radial direction.   
     
     
         4 . The blowing device according to  claim 3 , wherein
 the stator includes a stator core provided with a coil portion;   a radial direction outer lateral surface of the stator core includes:
 a stator first region that is in contact with an inner surface of the motor housing; and 
 a stator second region that opposes the inner surface of the motor housing with a gap in between in the radial direction; and 
   the opening region at the radial direction inner end of the communication hole overlaps a portion of the stator second region in the radial direction.   
     
     
         5 . The blowing device according to  claim 4 , wherein
 a surface of the stator includes a stator third region in which at least a portion thereof is, on an axial direction lower side with respect to the communication hole, in contact with the motor housing; and   the stator third region is disposed on the axial direction lower side of the stator second region.   
     
     
         6 . The blowing device according to  claim 4 , wherein an upper end of the opening region at the radial direction inner end of the communication hole is positioned on an axial direction upper side with respect to an upper end of the stator core. 
     
     
         7 . The blowing device according to  claim 1 , wherein in an upper portion of the first connection portion a backward rotation direction lateral surface of the first connection portion is a curved surface extending towards an axial direction upper side as the backward rotation direction lateral surface extends towards a forward rotation direction, and is recessed in the forward rotation direction and towards the axial direction upper side. 
     
     
         8 . The blowing device according to  claim 1 , wherein in an upper portion of the first connection portion, a forward rotation direction lateral surface of the first connection portion is a curved surface extending towards an axial direction lower side as the forward rotation direction lateral surface extends towards a forward rotation direction, and protrudes in the forward rotation direction and towards an axial direction upper side. 
     
     
         9 . The blowing device according to  claim 1 , wherein a width of the first connection portion in a circumferential direction is larger than a width of a second connection portion, which is a connection portion other than the first connection portion among the plurality of connection portions, in the circumferential direction. 
     
     
         10 . The blowing device according to  claim 1 , wherein a largest width of the communication hole in an axial direction is larger than a largest width of the communication hole in a circumferential direction. 
     
     
         11 . The blowing device according to  claim 1 , wherein the first connection portion is provided in a plural number, and a plurality of the first connection portions are located at equal distances in a circumferential direction. 
     
     
         12 . A vacuum cleaner comprising the blowing device according to  claim 1 .