Axial or diagonal fan with trip edge on the rotor blade
Assigneeebm-papst St. Georgen GmbH & Co. KG
InventorsPeter Ragg, Michael Stadler
Life of this patent
Estimating the term…
Abstract
An axial- or diagonal-fan has a fan wheel (34) having profiled rotor blades (32). Each blade has a suction or intake side (46), a portion located forward, with respect to the rotation direction (36), and having a leading edge (44), and a portion located rearward, with respect to the rotation direction (36), and having a trailing edge (92). Between said portions, on the intake side (46) of the respective rotor blade (32), a trip or separation edge (66) is provided, said trip edge having an S-shaped contour in a meridian cross-section.
Claims8
An axial- or diagonal-blower with an electric motor with a stator (118) and a rotor (120), a fan wheel (30), and a housing formed with a fanwheel-facing generally cylindrical inner surface (110), the electric motor being arranged in said housing, said fan wheel (30) comprising
- an annular fan wheel hub (34), secured to said rotor (120) and, together with the generally cylindrical inner surface (110), defining an annular air passage opening therebetween;
- a plurality of individual profiled fan rotor blades (32), each extending radially from a root (70) at said hub (34) to a blade outer tip arranged in said annular air passage opening;
- said profiled fan blades (32) each having an intake side (46), a portion located, with respect to rotation direction (36), forward and having a leading edge (44), a portion located, with respect to rotation direction (36), rearward, and having a trailing edge (92);
- between which portions a trip edge (66) is located, which, between said root and said tip, has an S-shaped contour,
- said contour extending, from a radially inner portion of said fan rotor blade to a radially outer portion (78) thereof, inside a band (B) measured, starting from said leading edge (44), within a range from 30% to 100% of the width (L) of the fan blade (32), said trip edge running from said radially inner portion of the fan rotor blade to said radially outer portion of the fan rotor blade.
Dependencies are inferred from the claim text.