公开(公告)号：US20200088211A1

公开(公告)日：2020-03-19

申请号：US16620182

申请日：2018-05-28

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Tooru IWATA ,  Hirotaka TOMIOKA ,  Kaname MARUYAMA

IPC: F04D29/38 ,  F04D29/66

Abstract: Blades (20a to 20c) of a propeller fan (10) have different circumferential pitches φ1, φ2, and φ3. The blades (20a to 20c) have different masses so that the center of gravity of the propeller fan (10) is positioned on a rotational center axis (11) of the propeller fan (10). Blade body portions (42c) of the blades (20a to 20c) have different thicknesses. In contrast, camber lines of the blades (20a to 20c) in blade cross section have the same shape, projections of the blades (20a to 20c) on a plane perpendicular to the rotational center axis (11) of the propeller fan (10) have the same shape, and leading edge portions (41a to 41c) of the blades (20a to 20c) have the same shape. As a result, a propeller fan (10) having reduced noise and vibrations can be achieved.

公开(公告)号：US20190316599A1

公开(公告)日：2019-10-17

申请号：US16471284

申请日：2017-12-08

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Tooru IWATA ,  Hirotaka TOMIOKA

IPC: F04D29/38 ,  F04D19/00

Abstract: In a blade of a propeller fan, a position on a chord line where the camber becomes maximum is set as a maximum camber position A, and a ratio of a distance d between a leading edge and the maximum camber position A to a chord length c is set as a maximum camber position ratio. The end portion on the hub side of the blade is set as a blade root, and the end portion on the outer circumferential side of the blade is set as a blade end. In the blade, the maximum camber position ratio monotonically increases in the direction from the reference blade cross section located between the blade root and the blade end toward the blade end and becomes maximum at the blade end. Thus, fan efficiency of the propeller fan is improved.

公开(公告)号：US20230349390A1

公开(公告)日：2023-11-02

申请号：US18212616

申请日：2023-06-21

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Hirotaka TOMIOKA ,  Takahiro YAMASAKI

IPC: F04D29/38 ,  F04D29/66

CPC classification number: F04D29/386 ,  F04D29/667 ,  F24F7/007

Abstract: A propeller fan includes a hub, and a plurality of wings provided at an outer circumference of the hub. Each of the wings includes a protrusion tapered and positioned on a rotation direction rear side in a radially outer portion of the wing, the protrusion includes a top positioned at a rearmost end in the rotation direction, an outer circumferential rear edge positioned radially outside the top, and an inner circumferential rear edge positioned radially inside the top, the outer circumferential rear edge includes a first serration having a first serration shape, and the inner circumferential rear edge includes a second serration having a second serration shape.

公开(公告)号：US20200158129A1

公开(公告)日：2020-05-21

申请号：US16604727

申请日：2018-04-06

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Tooru IWATA ,  Hirotaka TOMIOKA

IPC: F04D29/38 ,  F04D29/32

Abstract: In a blade of a propeller fan, an inclination angle (φ) is made by a straight line passing through an outer circumferential side end and an inner circumferential side end of a radial cross section of the blade with a second plane orthogonal to a center axis of a hub. In a blade end of the blade, one end in front of the other end viewed in the rotation direction of the propeller fan is a leading blade end, while the other end behind the leading blade end is a trailing blade end. The blade is shaped such that the inclination angle (φ) monotonically increases, in the direction from the intermediate position toward the trailing blade end, in an area extending from an intermediate position between the leading blade end and the trailing blade end to the trailing blade end.