Blowing device, and vacuum cleaner

Abstract

A blowing device according to an exemplary embodiment of the present disclosure includes a motor that includes a shaft disposed along a central axis extending in an up-down direction, an impeller fixed to the shaft, the impeller being disposed above the motor, an impeller cover that surrounds an upper side and an outer side in a radial direction of the impeller, the impeller cover including an intake port at a middle, a motor cover disposed on an outer side in a radial direction of the motor. The motor includes a rotor portion fixed to the shaft, the rotor portion including a magnet, a stator portion that opposes the magnet, and a bearing that rotatably supports the shaft with respect to the stator portion. The motor cover includes a tubular motor cover cylindrical portion that is open downwards. An inner surface of the motor cover cylindrical portion opposes the motor with a gap in between in the radial direction. The motor cover cylindrical portion includes a communication portion that communicates an inner space of the motor cover cylindrical portion and an outer space of the motor cover cylindrical portion to each other.

What is claimed is: 
     
         1 . A blowing device comprising:
 a motor that includes a shaft disposed along a central axis extending in an up-down direction;   an impeller fixed to the shaft, the impeller being disposed above the motor;   an impeller cover that surrounds an upper side and an outer side in a radial direction of the impeller, the impeller cover including an intake port at a middle;   a motor cover disposed on an outer side in a radial direction of the motor;   the motor including
 a rotor portion fixed to the shaft, the rotor portion including a magnet, 
 a stator portion that opposes the magnet, and 
 a bearing that rotatably supports the shaft with respect to the stator portion; 
   the motor cover including
 a tubular motor cover cylindrical portion that is open downwards; 
   an inner surface of the motor cover cylindrical portion opposing the motor with a gap in between in the radial direction; and   the motor cover cylindrical portion including a communication portion that communicates an inner space of the motor cover cylindrical portion and an outer space of the motor cover cylindrical portion to each other.   
     
     
         2 . The blowing device according to  claim 1 ,
 wherein the communication portion is disposed in plural numbers in a circumferential direction.   
     
     
         3 . The blowing device according to  claim 1 ,
 wherein a plurality of the communication portions are disposed at equal intervals in a circumferential direction.   
     
     
         4 . The blowing device according to  claim 1 ,
 wherein the communication portion is open downwards in an axial direction.   
     
     
         5 . The blowing device according to  claim 1 ,
 wherein the communication portion is a through hole that penetrates the motor cover cylindrical portion in the radial direction.   
     
     
         6 . The blowing device according to  claim 1 ,
 wherein the motor cover cylindrical portion includes
 a cylindrical portion side wall portion that connects an outer surface of the motor cover cylindrical portion and an inner surface of the motor cover cylindrical portion to each other, the cylindrical portion side wall portion constituting a side wall of the communication portion, and 
   wherein a radial-direction outer end portion of the cylindrical portion side wall portion is disposed on a front side in a rotation direction of the impeller with respect to a radial-direction inner end portion of the cylindrical portion side wall portion.   
     
     
         7 . The blowing device according to  claim 6 ,
 wherein the cylindrical portion side wall portion is a smooth curved surface that connects the radial-direction outer end portion of the cylindrical portion side wall portion and the radial-direction inner end portion of the cylindrical portion side wall portion to each other and that protrudes towards a rear side in the rotation direction of the impeller.   
     
     
         8 . The blowing device according to  claim 1 ,
 wherein the motor cover cylindrical portion includes
 a cylindrical portion upper wall portion that connects an outer surface of the motor cover cylindrical portion and an inner surface of the motor cover cylindrical portion to each other, the cylindrical portion upper wall portion constituting a side wall of the communication portion, and 
   wherein a radial-direction outer end portion of the cylindrical portion upper wall portion is disposed below a radial-direction inner end portion of the cylindrical portion upper wall portion in an axial direction.   
     
     
         9 . The blowing device according to  claim 8 ,
 wherein the cylindrical portion upper wall portion is a smooth curved surface that connects the radial-direction outer end portion of the cylindrical portion upper wall portion and the radial-direction inner end portion of the cylindrical portion upper wall portion to each other and that protrudes towards an upper side in the axial direction.   
     
     
         10 . The blowing device according to  claim 1 ,
 wherein the motor cover includes a plurality of stator blades disposed on the outer surface of the motor cover cylindrical portion in the circumferential direction.   
     
     
         11 . The blowing device according to  claim 10 ,
 wherein lower portions of the stator blades in the axial direction are disposed on a front side in a rotation direction of the impeller with respect to upper portions of the stator blades in the axial direction.   
     
     
         12 . The blowing device according to  claim 10 ,
 wherein the motor cover includes a tubular blower cover that extends downwards from a lower end portion of the impeller cover, the blower cover being connected to outer ends of the stator blades in the radial direction.   
     
     
         13 . The blowing device according to  claim 12 ,
 wherein the motor cover, the stator blades, and the blower cover are formed of an integral resin member, and   wherein at least a portion of the communication portion and at least a portion of the blower cover oppose each other in the radial direction.   
     
     
         14 . The blowing device according to  claim 8 ,
 wherein the motor cover includes a plurality of stator blades disposed on the outer surface of the motor cover cylindrical portion in the circumferential direction, and   wherein a radial-direction outer end portion of the cylindrical portion upper wall portion is disposed below lower ends of the stator blades in the axial direction.   
     
     
         15 . The blowing device according to  claim 8 ,
 wherein the motor cover includes a plurality of stator blades disposed on the outer surface of the motor cover cylindrical portion in the circumferential direction, and   wherein a radial-direction outer end portion of the cylindrical portion upper wall portion is disposed above lower ends of the stator blades in the axial direction.   
     
     
         16 . A vacuum cleaner comprising:
 the blowing device according to  claim 1 .