Centrifugal fan impeller with blades inclined relative to the axis of rotation

• US 7,210,907 B2
• Filed: 07/30/2003
• Issued: 05/01/2007
• Est. Priority Date: 08/02/2002
• Status: Expired due to Term

• Current Assignee: SPAL Automotive S.R.L.
• Original Assignee: SPAL S.r.l.
• Inventors: Patti, Salvatore
• Primary Examiner(s): Kershteyn; Igor
• Application Number:
  US10/522,302
• Publication Number:
  US 20060051202A1
• Time in Patent Office: 1,371 Days
• Field of Search: 416/178, 416/187, 416/200.R, 416/203, 415/98, 415/119
• US Class Current: 416/178
• CPC Class Codes: F04D 29/282 the leading edge of each vane being substantially parallel to the rotation axis
• CPC Class Codes: F04D 29/30 Vanes
• CPC Class Codes: F04D 29/666 by means of rotor construction or layout, e.g. unequal distribution of blades or vanes

Abstract

The invention relates to a centrifugal fan impeller (1) having an axis of rotation (6) and comprising one or more modules (2). Each module (2) comprises a mounting disc (4), at least one connecting ring (5) and a plurality of blades (3) extending between the mounting disc (4) and the connecting ring (5). The blades (3) are connected to the disc (4) and ring (5) at an angle (α) relative to the axis (6) of the impeller (1). The angle (α) at which the blades (3) are inclined may range from 5 to 30 degrees and the blades (3) may be rectangular or trapezoidal in shape depending on the type of performance required: improved capacity with rectangular blades or improved pressure head and acoustic properties with trapezoidal blades. Top performance is thus combined with acoustic comfort.

Claims

1. A centrifugal fan impeller (1) having an axis of rotation (6) and comprising one or more modules (2), comprising a mounting disc (4), at least one connecting ring (5) and a plurality of blades (3) extending between the mounting disc (4) and the connecting ring (5), the blades (3) being connected to the disc (4) and ring (5) at an angle (α

) relative to the axis (6) of the impeller (1), the impeller being characterised in that the angle (α

) at which the blades (3) are inclined is 10 degrees, in that the connecting ring (5) is positioned on an outer diameter in respect to the blades (3), whereby the inner part of the mould for producing the fan impeller (1) can be extracted axially from both sides of the fan impeller (1),

in that the profile of each blade (3) at a root thereof is inclined at an angle (γ

l) ranging from 50 to 80 degrees,

and in that the profile of each blade (3) at an end thereof is inclined at an angle (γ

2) ranging from 33 to 63 degrees, said angles (γ

1, γ

2) at the root (7) and at the end (8) of the blade (3) being defined as the angles made by the profile of the blade (3), at the root and end of the blade respectively, with respect to an impeller radius (R1, R2) passing through the leading edge (A) of the profile.

2. The impeller according to claim 1, characerised in that each blade (3) is substantially trapezoidal in shape when seen in a straightened plan view.

3. The impeller according to claim 2, characterised in that each blade (3) has a straight leading edge (A) inclined at an angle (β

) ranging from 0 to 40 degrees with respect to the axis (6) of the impeller (1).

4. The impeller according to claim 2, characterised in that each blade (3) has a straight trailing edge (U) parallel to the axis (6) of the impeller (1).

5. The impeller according to claim 2, characterised in that each blade (3) has a straight leading edge (A) inclined at an angle (β

) of 12.65 degrees with respect to the axis (6) of the impeller (1).

6. The impeller according to claim 1, characterised in that each blade (3) is substantially rectangular in shape when seen in a straightened plan view.

7. The impeller according to claim 1, characterised in that the profile of each blade (3) at the root is inclined at an angle (γ

1) of 65.2 degrees.

8. The impeller according to claim 1, characterised in that the profile of each blade (3) at the end is inclined at an angle (γ

2) of 48.2 degrees.