Blower

Abstract

A blower includes a rotor blade body rotatable about a central axis extending in an axial direction, a motor that rotates the rotor blade body, a housing including a ventilation passage and surrounding the rotor blade body and the motor, and a noise reducing member located in the ventilation passage. The noise reducing member is an impermeable porous member which includes a plurality of air bubbles opened to the ventilation passage on the surface side of the noise reducing member and in which a flow of gas in the intersecting direction of the surface of the noise reducing member and the plurality of air bubbles does not permeate.

What is claimed is: 
     
         1 . A blower comprising:
 a rotor blade body rotatable about a central axis extending in an axial direction;   a motor that rotates the rotor blade body;   a housing including a ventilation passage and surrounding the rotor blade body and the motor; and   a noise reducing member located in the ventilation passage, wherein   the noise reducing member is a porous member having a plurality of air bubbles opened to the ventilation passage on a surface side of the noise reducing member.   
     
     
         2 . The blower according to  claim 1 , wherein
 the plurality of air bubbles are spaced apart from each other.   
     
     
         3 . The blower according to  claim 1 , wherein
 among the plurality of air bubbles, an air bubble is connected to another air bubble at least in part.   
     
     
         4 . The blower according to  claim 1 , wherein
 the noise reducing member is located on at least a part of an inner surface of the housing, and is located to face at least a part of the rotor blade body in a radial direction of the central axis.   
     
     
         5 . The blower according to  claim 1 , wherein
 the housing further includes:
 a cylindrical portion extending along the axial direction; and 
 an inclined portion connected to another end in the axial direction of the cylindrical portion and inclined outward in the radial direction from one side to the other side in the axial direction, and 
   the noise reducing member is located on at least a part of an inner surface of the cylindrical portion.   
     
     
         6 . The blower according to  claim 1 , wherein
 the housing further includes:
 a cylindrical portion extending along the axial direction; and 
 a support portion that is located on one side in the axial direction of the rotor blade body and supports the rotor blade body and the motor with respect to the cylindrical portion, and 
   the noise reducing member is located on at least either a part of an inner surface of the cylindrical portion located on one side in the axial direction with respect to the rotor blade body or a surface of the support portion.   
     
     
         7 . The blower according to  claim 6 , wherein the support portion includes a stator vane. 
     
     
         8 . The blower according to  claim 1 , wherein the noise reducing member is located on a part of an inner surface of the housing located on another side in the axial direction of the rotor blade body. 
     
     
         9 . The blower according to  claim 1 , wherein the noise reducing member is a porous member in which a flow of gas in a thickness direction does not permeate. 
     
     
         10 . The blower according to  claim 2 , wherein the noise reducing member is a synthetic resin member. 
     
     
         11 . The blower according to  claim 1 , wherein
 the rotor blade body includes a curved surface that is convex toward one side in a blade thickness direction with respect to a chord connecting a leading edge and a trailing edge in an airfoil of the rotor blade body, and   the noise reducing member is located on at least a part of the curved surface.   
     
     
         12 . The blower according to  claim 11 , wherein
 the curved surface includes a maximum blade thickness portion located at a position at which a blade thickness of the airfoil is maximum, and   the noise reducing member includes, in a chord length direction in which the chord extends:
 an inlet portion located upstream of the maximum blade thickness portion and into which gas flows; and 
 an outlet portion located downstream of the inlet portion and through which the gas flowing into the inlet portion flows out.