AXIAL FLOW FAN, BLOWING DEVICE, AND REFRIGERATION CYCLE DEVICE

• Main Authors: NAKAJIMA, Akihide, YAMAMOTO, Katsuyuki, TADOKORO, Takahide, HOSOMI, Shota
• Format: Patent
• Language: English; French; German
• Published: 29.03.2023
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

An axial flow fan includes a hub configured to be driven to rotate and serve as a rotation axis and a blade provided around the hub and having a leading edge and a trailing edge. The blade has, at a root thereof, a thickness portion being a protrusion provided at a blade surface of the blade. The thickness portion includes a first thickness portion located adjacent to the leading edge and a second thickness portion located adjacent to the trailing edge. A virtual circle centered on the rotation axis and passing through the outermost one of virtual circles passing through both the first thickness portion and the second thickness portion of the blade is a reference circle, an intersection at which the reference circle intersects an edge portion of the first thickness portion and that is at an extremity in a rotation direction of the blade is a first intersection, an intersection at which the reference circle intersects an edge portion of the second thickness portion and that is at an extremity in an anti-rotation direction of the blade is a second intersection, an intersection of the reference circle and the leading edge is a first edge portion, an intersection of the reference circle and the trailing edge is a second edge portion, a virtual straight line passing through the rotation axis and the first intersection is a thickness portion first straight line, a virtual straight line passing through the rotation axis and the second intersection is a thickness portion second straight line, a virtual straight line passing through the rotation axis and the first edge portion is an edge portion first straight line, a virtual straight line passing through the rotation axis and the second edge portion is an edge portion second straight line, an angle between the thickness portion first straight line and the edge portion first straight line is a phase angle Θ1, and an angle between the thickness portion second straight line and the edge portion second straight line is a phase angle Θ2. The phase angle Θ1 is larger than the phase angle Θ2.