Fan Impeller with Multiple Blades Shaped and Disposed to Provide High Air-Power Efficiency

• US 20140233178A1
• Filed: 10/28/2011
• Published: 08/21/2014
• Est. Priority Date: 10/28/2011
• Status: Abandoned Application

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Inventors: Franz, John
• Application Number:
  US14/350,069
• Publication Number:
  US 20140233178A1
• Time in Patent Office: Days
• US Class Current: 361/679.48
• CPC Class Codes: F04D 17/06 Helico-centrifugal pumps
• CPC Class Codes: F04D 19/007 multistage fans
• CPC Class Codes: F04D 29/327 with non identical blades
• CPC Class Codes: F04D 29/329 Details of the hub
• CPC Class Codes: F04D 29/384 characterised by form
• CPC Class Codes: F04D 29/681 especially adapted for elastic fluid pumps
• CPC Class Codes: G06F 1/20 Cooling means
• CPC Class Codes: H05K 7/20009 using a gaseous coolant in electronic enclosures in cabinets of standardized dimensions H05K7/20536; in server cabinets H05K7/20709; in vehicle electronic casings H05K7/20845; in power control electronics H05K7/2089; in displays H05K7/20954
• CPC Class Codes: H05K 7/20136 Forced ventilation, e.g. by fans H05K7/202 takes precedence
• CPC Class Codes: H05K 7/20718 Forced ventilation of a gaseous coolant in closed loop H05K7/20754

Abstract

A fan impeller with multiple blades shaped and disposed to provide high air-power efficiency. The fan impeller includes a hub, a first plurality of primary blades and a second plurality of secondary blades. The leading edge of the first secondary blade is disposed proximately to the trailing edge of the first primary blade. A leading edge portion of the first secondary blade is also disposed in an inter-blade space between the first primary blade and a second primary blade. A trailing edge portion of the first secondary blade is disposed outside of the inter-blade space and towards a bottom of the hub. A cooling fan including the fan impeller, and an electrical apparatus including the cooling fan that includes the fan impeller are also provided.

Claims

1. A fan impeller with multiple blades shaped and disposed to provide high air-power efficiency, said fan impeller comprising:

a hub;

a first plurality of primary blades coupled to said hub;

a second plurality of secondary blades coupled to said hub; and

wherein a first primary blade is disposed closer to a top of said hub than a first secondary blade, a leading edge of said first secondary blade is disposed proximately to a trailing edge of said first primary blade, a leading edge portion of said first secondary blade is disposed in an inter-blade space between said first primary blade and a second primary blade, and a trailing edge portion of said first secondary blade is disposed outside of said inter-blade space and towards a bottom of said hub.

2. The fan impeller of claim 1, wherein said leading edge portion of said first secondary blade is disposed in said inter-blade space midway between said first primary blade and a second primary blade.

3. The fan impeller of claim 1, wherein said leading edge portion of said first secondary bade is disposed in said inter-blade space closer to a high pressure surface of said first primary blade than to a low pressure surface of said second primary blade.

4. The fan impeller of claim 1, wherein said first secondary blade is disposed to increase a stall point of said fan impeller to a point of higher air-flow than a stall point of a fan impeller without said second plurality of secondary blades.

5. The fan impeller of claim 1, wherein said air-power efficiency of said impeller is about equal to or greater than an air-power efficiency of an impeller without said second plurality of secondary blades.

6. The fan impeller of claim 1, wherein said first primary blade and said first secondary blade are shaped as airfoils.

7. The fan impeller of claim 1, wherein a chord length of said first secondary blade is less than a chord length of said first primary blade.

8. The fan impeller of claim 7, wherein said chord length of said first secondary blade is about a third of said chord length of said first primary blade.

9. The fan impeller of claim 1, wherein said hub has a tapered shape, and a top diameter of said hub is less than a bottom diameter of said hub.

10. The fan impeller of claim 1, wherein said impeller including said hub, said first plurality of primary blades and said second plurality of secondary blades further comprises one single unitary body.

11. The fan impeller of claim 10, wherein said single unitary body is without separable subcomponents, and is without a coupling means for coupling subcomponents, said coupling means selected from the group consisting of fasteners, interlocking structures, and bonding agents.

12. A cooling fan having a fan impeller with multiple blades shaped and disposed to provide high air-power efficiency, said cooling fan comprising:

a stator;

a rotor rotatably mounted in said stator; and

a fan impeller coupled to said rotor, said fan impeller comprising;

a hub;

a first plurality of primary blades coupled to said hub;

a second plurality of secondary blades coupled to said hub; and

wherein a first primary blade is disposed closer to a top of said hub than a first secondary blade, a leading edge of said first secondary blade is disposed proximately to a trailing edge of said first primary blade, a leading edge portion of said first secondary blade is disposed in an inter-blade space between said first primary blade and a second primary blade, and a trailing edge portion of said first secondary blade is disposed outside of said inter-blade space and towards a bottom of said hub.

13. An electrical apparatus having a cooling fan for cooling and having a fan impeller with multiple blades shaped and disposed to provide high air-power efficiency, said electrical apparatus comprising:

a chassis;

a plurality of electrical components disposed in said chassis; and

a cooling fan mounted in said chassis to cool said plurality of electrical components, said cooling fan comprising;

a stator;

a rotor rotatably mounted in said stator; and

a fan impeller coupled to said rotor, said fan impeller comprising;

a hub;

a first plurality of primary blades coupled to said hub;

a second plurality of secondary blades coupled to said hub; and

wherein a first primary blade is disposed closer to a top of said hub than a first secondary blade, a leading edge of said first secondary blade is disposed proximately to a trailing edge of said first primary blade, a leading edge portion of said first secondary blade is disposed in an inter-blade space between said first primary blade and a second primary blade, and a trailing edge portion of said first secondary blade is disposed outside of said inter-blade space and towards a bottom of said hub.

14. The electrical apparatus of claim 13, wherein said electrical apparatus is selected from the group consisting of a computer, a disk-drive array, and a network switching apparatus.

15. The electrical apparatus of claim 13, wherein said electrical apparatus further comprises s a blade server.