Bidirectional axial fan device

Patent metadata

Field	Value
Publication number	US-10260519-B2
Application number	US-201615130353-A
Country	US
Kind code	B2
Filing date	Apr 15, 2016
Priority date	Apr 24, 2015
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A bidirectional axial fan device includes: a moving blade member with a plurality of vanes; and a casing that includes a mounting portion, a frame, and a plurality of spokes, a motor being mounted to the mounting portion, the frame forming a ventilation hole. The plurality of spokes couple the mounting portion to the frame at an exhaust air side during a normal rotation of the motor. An inner peripheral surface of the frame has a multiple stage shape, in which a part on the exhaust air side during the normal rotation has a diameter larger than a diameter of a part on an air intake side during the normal rotation, such that intervals between tops on the exhaust air side during the normal rotation at outer peripheral edges of the plurality of vanes and the inner peripheral surface of the frame are expanded.

First claim

What is claimed is:

1. A bidirectional axial fan device comprising:
a motor rotatable in normal and reverse directions about a rotational axis;
a moving blade member with a plurality of vanes, the moving blade member being rotatably driven by the motor; and
a casing that includes a mounting portion, a frame, and a plurality of spokes, the motor being mounted to the mounting portion, the frame forming a ventilation hole, the plurality of spokes coupling the mounting portion to the frame, the plurality of vanes rotating in the ventilation hole, wherein
the plurality of spokes couples the mounting portion to the frame at an exhaust air side during a normal rotation of the motor,
an inner peripheral surface of the frame has a multiple stage shape, in which a part on the exhaust air side during the normal rotation has a diameter larger than a diameter of a part on an air intake side during the normal rotation, such that intervals between tops on the exhaust air side during the normal rotation at outer peripheral edges of the plurality of vanes and the inner peripheral surface of the frame are expanded,
the inner peripheral surface of the frame includes a smaller diameter portion, a larger diameter portion and an intermediate tapered portion, the smaller diameter portion being disposed on the air intake side during the normal rotation, the larger diameter portion being disposed on the exhaust air side during the normal rotation, the intermediate tapered portion being disposed axially between the smaller diameter portion and the larger diameter portion, and
a length of the smaller diameter portion in a direction of the rotational axis is shorter than a length of the larger diameter portion in the direction of the rotational axis.

2. The bidirectional axial fan device according to claim 1 , wherein
the intermediate tapered portion is positioned outside the tops on the exhaust air side during the normal rotation at the outer peripheral edges of the plurality of vanes.

3. The bidirectional axial fan device according to claim 2 , wherein
each of the plurality of vanes has an edge on the exhaust air side during the normal rotation, the edge curving such that an outside of the moving blade member approaches the air intake side during the normal rotation with respect to a center side of the moving blade member.

4. The bidirectional axial fan device according to claim 2 , wherein
the inner peripheral surface of the frame includes a tapered opening portion on the air intake side during the normal rotation with respect to the smaller diameter portion, the tapered opening portion expanding an opening on the air intake side during the normal rotation at the frame.

5. The bidirectional axial fan device according to claim 3 , wherein
the inner peripheral surface of the frame includes a tapered opening portion on the air intake side during the normal rotation with respect to the smaller diameter portion, the tapered opening portion expanding an opening on the air intake side during the normal rotation at the frame.

Assignees

• Sanyo Electric Co

Inventors

• Fujimake Satoshi
• Nishizawa Toshiya
• Kawashima Takashi

Classifications

• F04D25/0613

  the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator · CPC title

• F04D19/005 Primary

  reversible fans · CPC title

• F04D19/002 Primary

  Axial flow fans · CPC title

• F05D2250/292

  tapered · CPC title

• F04D29/325 Primary

  for axial flow fans (blade mountings F04D29/34, blades F04D29/38) · CPC title