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US 2006/0051202 A1Published application
Centrifugal fan impeller with blades inclined relative to the axis of rotation
AssigneeSPAL S.r.l.
InventorSalvatore Patti
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AssigneeSPAL S.r.l.
InventorSalvatore Patti
Estimating the term…
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.
A centrifugal fan impeller (1) having an axis of rotation (6) and comprising one or more modules (2), each module (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 may range from 5 to 30 (sexagesimal) degrees.
The impeller according to any of the foregoing claims, characterised in that the profile of each blade (3) at the root is inclined at an angle (γ1) ranging from 50 to 80 (sexagesimal) degrees.
The impeller according to any of the foregoing claims, characterised in that the profile of each blade (3) at the end is inclined at an angle (γ2) ranging from 33 to 63 (sexagesimal) degrees.
The impeller according to any of the foregoing claims, characterised in that the profile of each blade (3) at the root is inclined at an angle (γ1) of 65.2 (sexagesimal) degrees.
The impeller according to any of the foregoing claims, characterised in that the profile of each blade (3) at the end is inclined at an angle (γ2) of 48.2 (sexagesimal) degrees.
Dependencies are inferred from the claim text.