Blowing device and vacuum cleaner

Abstract

A blowing device includes a motor including a rotor rotatable, an impeller, a motor housing, a blower case, and stator blades including at least a first stator blade provided with a stator blade recess portion. A communication hole in the motor housing is provided in the first stator blade and is in communication with the stator blade recess portion. The first stator blade includes front and rear wall portions. Axial directions of the front and rear wall portions are longitudinal directions thereof. The communication hole is provided in the circumferential direction and between the front wall portion and the rear wall portion. The first stator blade includes a connection wall portion. An upper surface of the connection wall portion extends towards an axial direction lower side as the upper surface extends towards a radial direction inner side.

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 disposed on a radial direction outer side with respect to the motor;   a blower case disposed on the radial direction outer side with respect to the motor housing; and   a plurality of stator blades arranged in a circumferential direction and between the motor housing and the blower case; wherein   the plurality of stator blades include at least a single first stator blade provided with a stator blade recess portion recessed in a surface of a stator blade of the plurality of stator blades;   a communication hole that connects an internal portion and an external portion of the motor housing to each other is provided in the motor housing;   the communication hole is provided between a forward rotation direction end portion and a backward rotation direction end portion in the first stator blade and is in communication with the stator blade recess portion;   the first stator blade includes:
 a front wall portion disposed in the forward rotation direction end portion; and 
 a rear wall portion disposed in the backward rotation direction end portion; 
   an axial direction of each of the front wall portion and the rear wall portion is a longitudinal direction;   the communication hole is provided in the circumferential direction and between the front wall portion and the rear wall portion;   the first stator blade further includes a connection wall portion that connects a lower end portion of the front wall portion and a lower end portion of the rear wall portion to each other; and   an upper surface of the connection wall portion extends towards an axial direction lower side as the upper surface extends towards a radial direction inner side.   
     
     
         2 . The blowing device according to  claim 1 , wherein in an upper portion of the first stator blade, a backward rotation direction lateral surface of the rear wall portion is a curved surface that extends towards the axial direction lower side as the backward rotation direction lateral surface extends in the forward rotation direction, and is recessed in the forward rotation direction and towards an axial direction upper side. 
     
     
         3 . The blowing device according to  claim 1 , wherein in an upper portion of the first stator blade, a forward rotation direction lateral surface of the front wall portion is a curved surface that extends towards the axial direction lower side as the forward rotation direction lateral surface extends in the forward rotation direction, and protrudes in the forward rotation direction and towards an axial direction upper side. 
     
     
         4 . The blowing device according to  claim 1 , wherein in an upper portion of the first stator blade, a backward rotation direction lateral surface of the front wall portion extends in the axial direction. 
     
     
         5 . The blowing device according to  claim 1 , wherein an upper end of the front wall portion is on an axial direction upper side with respect to an upper end of the rear wall portion. 
     
     
         6 . The blowing device according to  claim 5 , wherein in an upper portion of the first stator blade, a backward rotation direction lateral surface of the front wall portion is a curved surface that extends towards the axial direction lower side as the backward rotation direction lateral surface extends in the forward rotation direction, and is recessed in the forward rotation direction and towards an axial direction upper side. 
     
     
         7 . The blowing device according to  claim 1 , wherein
 the front wall portion is a portion of a member that includes either one of the motor housing and the blower case; and   the rear wall portion is a portion of a member that includes the other one of the motor housing and the blower case.   
     
     
         8 . The blowing device according to  claim 1 , wherein the motor housing includes:
 an upper motor housing; and   a lower motor housing attached below the upper motor housing in the axial direction;   the front wall portion is a portion of a member that includes either one of the upper motor housing and the lower motor housing; and   the rear wall portion is a portion of a member that includes the other one of the upper motor housing and the lower motor housing.   
     
     
         9 . The blowing device according to  claim 1 , wherein a circumferential direction width of the first stator blade is larger than a circumferential direction width of a second stator blade, the second stator blade being a stator blade other than the first stator blade among the plurality of stator blades. 
     
     
         10 . The blowing device according to  claim 1 , wherein a circumferential direction lateral surface of the communication hole extends towards the forward rotation direction as the circumferential direction lateral surface extends towards the radial direction inner side. 
     
     
         11 . The blowing device according to  claim 1 , wherein at least either one of a lower surface of the motor housing at an axial direction upper edge portion of the communication hole and an upper surface of the motor housing at an axial direction lower edge portion of the communication hole extends towards the axial direction lower side as the lower surface or the upper surface extends towards the radial direction inner side. 
     
     
         12 . The blowing device according to  claim 1 , wherein the communication hole is provided in a plural number and at equal distances in the circumferential direction. 
     
     
         13 . A vacuum cleaner comprising the blowing device according to  claim 1 .