Cross flow fan

Patent metadata

Field	Value
Publication number	US-9638195-B2
Application number	US-201214354902-A
Country	US
Kind code	B2
Filing date	Nov 1, 2012
Priority date	Nov 4, 2011
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

A cross flow fan includes a support plate and an impeller with a plurality of blades disposed on the support plate at predetermined intervals. On each blade, a radius of a pressure surface arc is greater than a radius of a suction surface arc, a radius of an inner peripheral side arc is greater than a radius of an outer peripheral side arc, and a region of maximum thickness is located 40% to 60% from the inner peripheral side arc in the lengthwise direction. The blades are disposed such that the inner peripheral side arcs are positioned on an inner peripheral side of the support plate and the outer peripheral side arcs are positioned on an outer peripheral side of the support plate. A flow path width between the plurality of blades gradually decreases from the inner peripheral side toward the outer peripheral side of the support plate.

First claim

What is claimed is:

1. A cross flow fan comprising:
a support plate; and
an impeller including a plurality of blades disposed on the support plate at predetermined intervals a lengthwise direction cross-sectional shape of each of the blades having
a suction surface arc that forms a convex suction surface,
a pressure surface arc that forms a concave pressure surface,
an inner peripheral side arc that interconnects a first end of the suction surface arc and a first end of the pressure surface are, and
an outer peripheral side arc that interconnects a second end of the suction surface arc and a second end of the pressure surface arc,
a radius of the pressure surface arc being greater than a radius of the suction surface arc,
a radius of the inner peripheral side arc being greater than a radius of the outer peripheral side arc and
a region of maximum thickness of the blade being located in a position 40% to 60% from the inner peripheral side arc in the lengthwise direction, to obtain low air turbulence and reduce power loss of the cross flow fan,
the blades being disposed such that the inner peripheral side arcs are positioned on an inner peripheral side of the support plate and the outer peripheral side arcs are positioned on an outer peripheral side of the support plate, and
a flow path width between the plurality of blades gradually decreasing from the inner peripheral side toward the outer peripheral side of the support plate.

2. The cross flow fan according to claim 1 , wherein
the suction surface of each of the blades is formed by a single suction surface arc,
the pressure surface of each of the blades is formed by a plurality of pressure surface arcs, and
the radius of each of the plurality of pressure surface arcs is greater than the radius of the suction surface arc of the blade.

3. The cross flow fan according to claim 2 , wherein
a size of the radius of each of the plurality of pressure surface arcs is dimensioned such that the size of the radius decrease in stages, and
the thickness of each of the blades becomes smaller in stages from the region of maximum thickness toward the outer peripheral side arc of the blade.

4. The cross flow fan according to claim 3 , wherein
a maximum percentage decrease of the flow path width between each of the plurality of blades is 20%.

5. The cross flow fan according to claim 2 , wherein
a maximum percentage decrease of the flow path width between each of the plurality of blades is 20%.

6. The cross flow fan according to claim 1 , wherein
a maximum percentage decrease of the flow path width between each of the plurality of blades is 20%.

7. An air conditioning apparatus indoor unit comprising:
a cross flow fan including:
a support plate; and
an impeller including a plurality of blades disposed on the support plate at predetermined intervals, a lengthwise direction cross-sectional shape of each of the blades having
a suction surface arc that forms a convex suction surface,
a pressure surface arc that forms a concave pressure surface,
an inner peripheral side arc that interconnects a first end of the suction surface arc and a first end of the pressure surface arc, and
an outer peripheral side arc that interconnects a second end of the suction surface arc and a second end of the pressure surface arc,
a radius of the pressure surface arc being greater than a radius of the suction surface arc,
a radius of the inner peripheral side arc being greater than a radius of the outer peripheral side arc, and
a region of maximum thickness of the blade being located in a position 40% to 60% from the inner peripheral side arc in the lengthwise direction, to obtain low air turbulence and reduce power loss of the cross flow fan,
the blades being disposed such that the inner peripheral side arcs are positioned on an inner peripheral side of the support plate and the outer peripheral side arcs are positioned on an outer peripheral side of the support plate, and
a flow path width between the plurality of blades gradually decreasing from the inner peripheral side toward the outer peripheral side of the support plate,
the air conditioning unit further comprising:
a heat exchanger; and
a casing.

8. An air conditioning apparatus comprising:
an air conditioning apparatus indoor unit including a cross flow fan, the cross flow fan including:
a support plate; and
an impeller including a plurality of blades disposed on the support plate at predetermined intervals, a lengthwise direction cross-sectional shape of each of the blades having
a suction surface arc that forms a convex suction surface,
a pressure surface arc that forms a concave pressure surface,
an inner peripheral side arc that interconnects a first end of the suction surface arc and a first end of the pressure surface are, and
an outer peripheral side arc that interconnects a second end of the suction surface arc and a second end of the pressure surface arc,
a radius of the pressure surface arc being greater than a radius of the suction surface arc,
a radius of the inner peripheral side arc being greater than a radius of the outer peripheral side arc, and
a region of maximum thickness of the blade being located in a position 40% to 60% from the inner peripheral side arc in the lengthwise direction, to obtain low air turbulence and reduce Dower loss of the cross flow fan,
the blades being disposed such that the inner peripheral side arcs are positioned on an inner peripheral side of the support plate and the outer peripheral side arcs are positioned on an outer peripheral side of the support plate, and
a flow path width between the pluralities of blades gradually decreasing from the inner peripheral side toward the outer peripheral side of the support plate,
the air conditioning apparatus further comprising:
an outdoor unit; and
a pipe interconnecting the air conditioning apparatus indoor unit and the outdoor unit.

Assignees

• Univ Shanghai Jiaotong
• Daikin Ind Ltd

Inventors

• Tian Jie
• Ouyang Hua
• Li You
• Teraoka Hironobu
• Tei Shimei
• Tanaka Hideshi

Classifications

• F04D29/283

  rotors of the squirrel-cage type · CPC title

• F04D29/30

  Vanes · CPC title

• F24F1/0025

  Cross-flow or tangential fans · 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