Patent ID: 11953020
Assignee: DAIKIN INDUSTRIES, LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 3:
4. The turbofan of claim 1, wherein
a cross section showing an airfoil of each of the blade members is a target cross section,
a circle passing through a leading edge of the target cross section and centered at a center axis of the end plate is a front circle,
a circle passing through a trailing edge of the target cross section and centered at the center axis of the end plate is a rear circle,
an angle formed at the leading edge of the target cross section by a tangent to a camber line of the target cross section and a tangent to the front circle is an inlet angle θi,
an angle formed at the trailing edge of the target cross section by a tangent to the camber line of the target cross section and a tangent to the rear circle is an outlet angle θo,
a value obtained by dividing, the outlet angle θo by the inlet angle θi is an angle ratio θo/θi, and
an average of the angle ratios θo/θi of an entirety of the blade member is less than 2.5.