Blade of a ventilator wheel, ventilator wheel and axial ventilator
Assigneeebm-papst Mulfingen GmbH & Co. KG
InventorsDaniel Gebert, Erhard Gruber, Oliver Haaf, Thorsten Pissarczyk
Life of this patent
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Abstract
The invention relates in particular to a ventilator wheel of an axial ventilator, which includes multiple blades, each having radially outward extending blade forward edges and radial outer edges on the outlet side, wherein a transition from the radial outer edges to the blade forward edges is formed, in each case with a projection extending in the circumferential direction relative to the adjacent, radially outward extending blade forward edges, wherein a seamless transition is formed from the radial outer edge portion (7) to a region of the respective blade situated radially further inward.
Claims13
A blade of a ventilator wheel, the blade comprising:
- a radially outward extending blade forward edge and
- a radial outer edge on an outlet side, wherein
- a transition from the radial outer edge to the blade forward edge is formed with a projection extending in a circumferential direction relative to the radially outward extending blade forward edge, so that a blade edge width locally delimited in a radial outer edge portion that includes the projection is enlarged around the projection, the projection has a semi-spherical termination at a forward portion adjacent to the blade forward edge, and a first seamless transition is formed from the radial outer edge portion to a region of the blade located radially further inward, the radial outer edge portion of the blade at the semi-spherical termination includes an axial thickness that is greater than an axial thickness in a rear portion adjacent to a blade rear edge, a second transition of the axial thickness is seamlessly formed from the forward portion to the rear portion;
- and
- a winglet is formed near the rear portion adjacent to the blade rear edge, the winglet is curved at a predetermined setting angle along an axial outer edge of the blade in an axial direction, the profile of the winglet transitions axially along the radial outer edge into the semi-spherical termination at the forward portion of the projection and the first and second transitions between the winglet and the semi-spherical termination are seamlessly formed both axially and from the radial outer edge portion to a radially inner portion of the blade.
A ventilator wheel of an axial ventilator, the ventilator wheel comprising:
- multiple blades, each blade having a radially outward extending blade forward edge and a radial outer edge on an outlet side, wherein
- a first transition is formed from each of the radial outer edges to a respective blade forward edge, a projection extending in a circumferential direction relative to an adjacent radially outward extending blade forward edge, so that a blade edge width, locally delimited in a radial outer edge portion that includes the projection, is enlarged around the projection, a respective radial outer edge portion of each of the blades at a termination of the blade forward edge includes an axial thickness that is greater than an axial thickness in a rear portion adjacent to a blade rear edge, a second transition of the axial thickness is seamlessly formed from the blade forward edge to the rear portion;
- and
- a winglet is formed near the rear portion adjacent to the blade rear edge, the winglet is curved at a predetermined setting angle along an axial outer edge of the respective blades in an axial direction, the profile of the winglet transitions semi-spherically into the termination at the forward portion of the projection and the first and second transitions between the winglet and the semi-spherical termination are seamlessly formed both axially and from the radial outer edge portion to a radially inner portion of the blade.
Dependencies are inferred from the claim text.