Patent ID: 11959488
Assignee: LG ELECTRONICS INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A blower, comprising:
a lower case in which at least one suction hole through which air flows inside is formed;
an upper case that is disposed on the lower case and in which at least one discharge hole through which air is discharged is formed; and
a fan that is disposed in the lower case and comprises a hub coupled to a motor, a shroud spaced apart below from the hub, and a plurality of blades that connects the hub and the shroud, wherein each of the plurality of blades includes:
a tip portion connected to the shroud;
a root portion connected to the hub;
a trailing edge defined as a rear end with respect to a rotational direction;
a leading edge that faces the trailing edge, defined as a front end with respect to the rotational direction, curved toward the trailing edge such that a maximum curved point is formed where a distance between the leading edge and the trailing edge becomes minimal;
a first reference airfoil defined as a surface parallel to the tip portion and the root portion, and located downstream of the leading edge with respect to the maximum curved point;
a second reference airfoil defined as a surface parallel to the tip portion and the root portion, and located upstream of the leading edge with respect to the maximum curved point, wherein a first inlet angle defined as a contained angle between a trace of the leading edge and a tangential line of the first reference airfoil at an intersection point of the leading edge and the first reference airfoil is smaller than a second inlet angle defined as a contained angle between a trace of the leading edge and a tangential line of the second reference airfoil at an intersection point of the leading edge and the second reference airfoil.