Propeller fan, propeller fan device, and air conditioner outdoor unit

Patent metadata

Field	Value
Publication number	US-10634161-B2
Application number	US-201515752012-A
Country	US
Kind code	B2
Filing date	Sep 8, 2015
Priority date	Sep 8, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

Provided is a propeller fan including a boss, and a blade fixed at an outer peripheral surface of the boss, wherein the blade has a second protrusion that protrudes toward a positive pressure surface side, at a trailing edge with respect to a rotation direction, the second protrusion is provided in a range on a radially outer side of a center of a radial distance from an inner peripheral end to an outer peripheral end of the blade, and has a protrusion tip end with a maximum protrusion height, a first base at a starting part of protrusion on a radially inner side of the protrusion tip end, and a second base at a starting part of protrusion on a radially outer side of the protrusion tip end, and the protrusion tip end is positioned nearer to the second base than to the first base in the radial direction.

First claim

The invention claimed is:

1. A propeller fan, comprising:
a boss that rotates around a rotation axis; and
a blade fixed at an outer peripheral surface of the boss, wherein
the blade has a first protrusion that protrudes toward a negative pressure surface side, at a leading edge with respect to a rotation direction,
the first protrusion is provided in a range on a radially outer side of a center of a radial distance from an inner peripheral end to an outer peripheral end of the blade, and has a protrusion tip end with a maximum protrusion height, a first base at a starting part of protrusion on a radially inner side of the protrusion tip end, and a second base at a starting part of protrusion on a radially outer side of the protrusion tip end, and
the protrusion tip end is positioned nearer to the second base than to the first base in the radial direction.

2. The propeller fan of claim 1 , wherein the first protrusion has a protrusion shape defined by a curved surface.

3. A propeller fan, comprising:
a boss that rotates around a rotation axis; and
a blade fixed at an outer peripheral surface of the boss, wherein
the blade has a protrusion that protrudes toward a positive pressure surface side, at a trailing edge with respect to a rotation direction,
the protrusion is provided in a range on a radially outer side of a center of a radial distance from an inner peripheral end to an outer peripheral end of the blade, and has a protrusion tip end with a maximum protrusion height, a first base at a starting part of protrusion on a radially inner side of the protrusion tip end, and a second base at a starting part of protrusion on a radially outer side of the protrusion tip end, and
the protrusion tip end is positioned nearer to the second base than to the first base in the radial direction.

4. The propeller fan of claim 3 , wherein the protrusion has a protrusion shape defined by a curved surface.

5. The propeller fan of claim 1 , wherein the protrusion tip end has a protrusion height less than a radial distance between the first base and the second base.

6. A propeller fan device comprising: the propeller fan of claim 1 ; a bell mouth; and a fan grill, wherein
the bell mouth surrounds a part of the propeller fan on a downstream side in a blowing direction in a plan view, a part of the propeller fan on an upstream side in the blowing direction is positioned outside the bell mouth in the plan view, and the fan grill is arranged downstream of the propeller fan in the blowing direction.

7. An air conditioner outdoor unit comprising the propeller fan of claim 1 .

8. The propeller fan of claim 3 , wherein the protrusion tip end has a protrusion height less than a radial distance between the first base and the second base.

9. A propeller fan device comprising: the propeller fan of claim 3 ; a bell mouth; and a fan grill, wherein
the bell mouth surrounds a part of the propeller fan on a downstream side in a blowing direction in a plan view, a part of the propeller fan on an upstream side in the blowing direction is positioned outside the bell mouth in the plan view, and the fan grill is arranged downstream of the propeller fan in the blowing direction.

10. An air conditioner outdoor unit comprising the propeller fan of claim 3 .

11. The propeller fan of claim 1 , wherein
the blade has a second protrusion at a trailing edge of the blade with respect to the rotation direction that protrudes toward a positive pressure surface side.

12. The propeller fan of claim 1 , wherein
the first protrusion extends in an area of the blade having a radius ratio of 0.5 between the inner peripheral end and the outer peripheral end of the blade in the radial direction, and
the radius ratio is r/R, R is a distance from the rotation axis to the outer peripheral end along the radial line, and r is an arbitrary position on the blade along the radial line viewed in a plan view.

13. The propeller fan of claim 3 , wherein
the protrusion extends in an area of the blade having a radius ratio of 0.5 between the inner peripheral end and the outer peripheral end of the blade in the radial direction, and
the radius ratio is r/R, R is a distance from the rotation axis to the outer peripheral end along the radial line, and r is an arbitrary position on the blade along the radial line viewed in a plan view.

Assignees

• Mitsubishi Electric Corp

Inventors

• Nakashima Seiji
• Yamamoto Katsuyuki

Classifications

• F24F1/06

  Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger · CPC title

• F05D2240/303

  related to the leading edge of a rotor blade · CPC title

• F24F1/38

  Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings · CPC title

• F05D2240/304

  related to the trailing edge of a rotor blade · CPC title

• F04D29/681

  especially adapted for elastic fluid pumps · CPC title