US 12,454,963 B2
Centrifugal fan and method for manufacturing the same
Seungdeok Yang, Seoul (KR); Bonchang Hwang, Seoul (KR); Woojoo Choi, Seoul (KR); and Seokho Choi, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Mar. 21, 2024, as Appl. No. 18/611,824.
Claims priority of application No. 10-2023-0095239 (KR), filed on Jul. 21, 2023.
Prior Publication US 2025/0035128 A1, Jan. 30, 2025
Int. Cl. F04D 29/42 (2006.01); F04D 17/16 (2006.01); F04D 29/44 (2006.01); F04D 29/62 (2006.01)
CPC F04D 29/4226 (2013.01) [F04D 17/16 (2013.01); F04D 29/444 (2013.01); F04D 29/624 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A centrifugal fan, comprising:
a main plate having an opening for mounting a motor;
a shroud spaced apart from the main plate and having an inlet port for sucking air in an axial direction; and
a plurality of blades connected between the main plate and the shroud and arranged in a circumferential direction of the opening so as to discharge air sucked through the inlet port in a radial direction, wherein each of the plurality of blades comprise a positive pressure surface along which air flows, a negative pressure surface opposite to the positive pressure surface, a leading edge defining an upstream end in the radial direction, and a trailing edge defining a downstream end, wherein the main plate, the shroud, and the plurality of blades are integrally formed as one body through injection such that the positive pressure surface, the negative pressure surface, the leading edge and the trailing edge form a curved surface, wherein the leading edge is formed such that a distance from a center of the main plate to the leading edge increases in a direction from the main plate towards the shroud, and wherein, when a center line extending radially from the center of the main plate and a plurality of points along the leading edge are defined, the plurality of points being arranged in the direction from the main plate to the shroud along the leading edge, a center angle formed by the center line and an extension line connecting the plurality of points and the center of the main plate becomes smaller as a distance from the extension line to the shroud decreases.