Abstract: A fan includes a core part, a vanes, a ring part and a flow rectifying member. The ring part includes first second and third parts. The first part includes a first end overlapping with a flow rectifying member end and extends axially on a radially inner side of the flow rectifying member. The second part includes a second end spaced from the flow rectifying member end, overlapping with the flow rectifying member, and connected to the first end. The third part is connected to the second end, and extends on the radially outer side of the flow rectifying member end. The second end overlaps with a virtual point reached by the flow rectifying member end being linearly extended toward an upstream side. A first dimension, a radial length of the third part, is at least 0.5 times a first straight-line distance between the flow rectifying member end and the virtual point.

Abstract: A fan includes a core part, a vanes, a ring part and a flow rectifying member. The ring part includes first second and third parts. The first part includes a first end overlapping with a flow rectifying member end and extends axially on a radially inner side of the flow rectifying member. The second part includes a second end spaced from the flow rectifying member end, overlapping with the flow rectifying member, and connected to the first end. The third part is connected to the second end, and extends on the radially outer side of the flow rectifying member end. The second end overlaps with a virtual point reached by the flow rectifying member end being linearly extended toward an upstream side. A first dimension, a radial length of the third part, is at least 0.5 times a first straight-line distance between the flow rectifying member end and the virtual point.

Abstract: A blower is provided with an axial flow impeller 7, a fan motor 8 positioned in a suction side of the axial flow impeller 7, and a motor stay 9 supporting the fan motor 8. The motor stay 9 is substantially formed to have a linear shape and attached in parallel to a rotating surface of the axial flow impeller 7. An impeller blade front edge 17 of the axial flow impeller 7 is positioned in a region X which is closer to the motor stay 9 than a region Y in which an air flow turbulence in a wake flow of the motor stay 9 is expanded, and in which region X a range of the air flow turbulence is reduced. Accordingly, it is possible to inhibit the air flow turbulence in the wake flow of the motor stay 9 from affecting the aerodynamic characteristics and noise characteristics (for example, an increase of an NZ noise) of the axial flow impeller 7.

Abstract: A blower is provided with an axial flow impeller 7, a fan motor 8 positioned in a suction side of the axial flow impeller 7, and a motor stay 9 supporting the fan motor 8. The motor stay 9 is substantially formed to have a linear shape and attached in parallel to a rotating surface of the axial flow impeller 7. An impeller blade front edge 17 of the axial flow impeller 7 is positioned in a region X which is closer to the motor stay 9 than a region Y in which an air flow turbulence in a wake flow of the motor stay 9 is expanded, and in which region X a range of the air flow turbulence is reduced. Accordingly, it is possible to inhibit the air flow turbulence in the wake flow of the motor stay 9 from affecting the aerodynamic characteristics and noise characteristics (for example, an increase of an NZ noise) of the axial flow impeller 7.

Abstract: In an axial flow fan provided with a plurality of impeller blades (13) provided in a hub (14), and a plurality of bent portions (13c) each formed by bending an outer peripheral edge of each of the impeller blades (13) toward a negative pressure surface (13e) of each of the impeller blades (13), a protruding portion (13f) is provided in a portion in which a blowing wind speed is high and a pressure rising work is most effectively carried out, in a rear edge portion (13b) of each of the impeller blades (13). Each of the protruding portions (13f) protrudes to an inverse direction to a rotating direction of each of the impeller blades (13) with respect to a straight line L connecting a proximal end and an outer peripheral end in the rear edge portion (13b) of each of the impeller blades (13).