Patent ID: 11933316
Assignee: NIDEC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  H | IPC F  H

Claim 6:
7. A blower, comprising:
a moving blade rotatable about a central axis extending in a vertical direction;
a motor to rotate the moving blade;
a housing surrounding the moving blade and the motor; and
a substrate; wherein
the housing includes a holding portion below the moving blade to hold the motor, and a peripheral wall portion having a cylindrical shape centered on the central axis and extending upward from a radially outer end portion of the holding portion;
the peripheral wall portion includes a peripheral wall recess recessed downward from an upper end of the peripheral wall portion and connecting a space radially inside of the peripheral wall portion and a space radially outside of the peripheral wall portion;
the peripheral wall recess includes a first peripheral surface that faces one circumferential direction that is opposite to a rotation direction of the moving blade, the first peripheral surface extending in the one circumferential direction from an upper end of the peripheral wall recess toward a lower side;
the substrate is radially inside of the peripheral wall portion;
the substrate opposes the peripheral wall recess in a radial direction;
the first peripheral surface includes a first surface extending from the upper end of the peripheral wall recess and a second surface extending from a lower end of the first surface;
the first surface is curved upward and toward the one circumferential direction as viewed from the radial direction, and a first tilt direction of the first surface is perpendicular to normal and radial directions of the first surface at an upper end of the first surface;
a second tilt direction of the second surface is perpendicular or substantially perpendicular to normal and radial directions of the second surface at an upper end of the second surface; and
a first acute angle defined by the first tilt direction with an axial direction is greater than a second acute angle defined by the second tilt direction with the axial direction.