Abstract: An axial flow fan is configured to allow leakage flows in regions near rear edges of bent portions formed by bending outer peripheries of blades towards negative pressure surfaces to smoothly flow out to reduce the vortex scale of the leakage flows themselves and to be able to effectively control turbulence of the flows. The axial flow fan includes a bellmouth and blades, with outer peripheries of the blades being bent towards negative pressure surfaces, wherein in regions near rear edges of bent portions that are bent towards the negative pressure surfaces, there are disposed second bent portions formed by bending part of the bent portions further towards the negative pressure surfaces.

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: An air delivery unit includes a casing, an air delivery device arranged in a fan passage in the casing, and a fan guard that is arranged at an air outlet of the casing and has an air blowing surface having a grill structure and a hollow frame wall portion. An air blowing opening is formed in the frame wall portion of the fan guard. This structure allows the air to be blown also from the opening of the frame wall portion of the fan guard. This reduces the amount and the speed of the air blown from the air blowing surface of the fan guard having the grill structure. As a result, rise of static pressure of the air delivery device is suppressed and noise caused by interference between bars of an air blowing grill and the air is reduced.

Abstract: An axial flow fan is configured to allow leakage flows in regions near rear edges of bent portions formed by bending outer peripheries of blades towards negative pressure surfaces to smoothly flow out to reduce the vortex scale of the leakage flows themselves and to be able to effectively control turbulence of the flows. The axial flow fan includes a bellmouth and blades, with outer peripheries of the blades being bent towards negative pressure surfaces, wherein in regions near rear edges of bent portions that are bent towards the negative pressure surfaces, there are disposed second bent portions formed by bending part of the bent portions further towards the negative pressure surfaces.

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).