Abstract: Provided is an axial fan including: a rotor blade having a rotation axis along an air-blowing direction; and a casing, wherein the casing includes: an outer frame portion housing the rotor blade; a cylindrical base portion located on the rotation axis; and a fixed blade provided between an inner peripheral surface of the outer frame portion and an outer peripheral surface of the base portion and downstream of the rotor blade in the air-blowing direction, the fixed blade includes a wind receiving surface, and the wind receiving surface in a first cross section, along the air-blowing direction, of the fixed blade has a smaller blade curvature than the wind receiving surface in a second cross section of the fixed blade along a cutting plane line at a position moved in a rotation direction of the rotor blade from a cutting plane line of the first cross section.

Abstract: Provided is an axial fan including: a rotor blade having a rotation axis along an air-blowing direction; and a casing, wherein the casing includes: an outer frame portion housing the rotor blade; a cylindrical base portion located on the rotation axis; and a fixed blade provided between an inner peripheral surface of the outer frame portion and an outer peripheral surface of the base portion and downstream of the rotor blade in the air-blowing direction, the fixed blade includes a wind receiving surface, and the wind receiving surface in a first cross section, along the air-blowing direction, of the fixed blade has a smaller blade curvature than the wind receiving surface in a second cross section of the fixed blade along a cutting plane line at a position moved in a rotation direction of the rotor blade from a cutting plane line of the first cross section.

Abstract: An axial blower includes: a housing including a wind tunnel; an impeller that is disposed in the wind tunnel and includes a plurality of blades; and a motor that includes a rotation shaft and is secured to the housing, the impeller being secured to the rotation shaft. When an angle between a chord of the blade at a cross-sectional surface of the blade cut by a virtual cylindrical surface centering the rotation shaft, and a surface perpendicular to the rotation shaft is defined as a mounting angle, the blade includes an intermediate part between an inside diameter side part and an outside diameter side part of the blade, and this intermediate part has a mounting angle equal to or larger than a mounting angle of the inside diameter side part, and larger than a mounting angle of the outside diameter side part.

Abstract: An axial blower includes: a housing including a wind tunnel; an impeller that is disposed in the wind tunnel and includes a plurality of blades; and a motor that includes a rotation shaft and is secured to the housing, the impeller being secured to the rotation shaft. When an angle between a chord of the blade at a cross-sectional surface of the blade cut by a virtual cylindrical surface centering the rotation shaft, and a surface perpendicular to the rotation shaft is defined as a mounting angle, the blade includes an intermediate part between an inside diameter side part and an outside diameter side part of the blade, and this intermediate part has a mounting angle equal to or larger than a mounting angle of the inside diameter side part, and larger than a mounting angle of the outside diameter side part.