Low tone axial fan structure
AssigneeSiemens Automotive Corporation
InventorsSylvain Nadeau, Konstantin Kurbatskii
Life of this patent
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Abstract
A low tone axial flow fan structure includes a hub 12; an inner fan 14 including a number of inner blades 16 attached to the hub and extending radially outwardly to a first circumferentially extending blade support structure 18; and an outer fan 20 including a number of outer blades 22 attached to the first circumferentially extending blade support structure 18 and extending radially outwardly to a second circumferentially extending blade support structure 20. The number of outer blades defines an outer fan blade passing order. The number of inner blades ensures creation of blade passing orders or multiple of said blade passing orders within one blade passing order of the outer fan blade passing order so as to provide masking of the outer fan blade passing order.
Claims8
A low tone axial flow fan structure comprising:
- a hub,
- an inner fan including a number of inner blades attached to the hub and extending radially outwardly to a first circumferentially extending blade support structure, the number of inner blades defining an inner fan blade passing order or defining multiples of the inner fan blade passing order,
- an outer fan including a number of outer blades attached to the first circumferentially extending blade support structure and extending radially outwardly to a second circumferentially extending blade support structure, the number of outer blades defining an outer fan blade passing order,
- wherein the inner fan blade passing order, or multiples thereof, is within one blade passing order of the outer fan blade passing order so as to provide masking of the outer fan blade passing order.
A low tone axial flow fan structure comprising:
- a hub,
- an inner fan including a plurality of inner blades attached to the hub and extending radially outwardly to a first circumferentially extending blade support structure, the number of inner blades defining an inner fan blade passing order or defining multiples of the inner fan blade passing order,
- an outer fan including a plurality of outer blades extending radially outwardly to a second circumferentially extending blade support structure, the number of second blades defining an outer fan blade passing order, and
- intermediate fan structure between the first and second circumferentially extending blade support members, the intermediate fan structure including a plurality of intermediate fan blades, the number of intermediate fan blades defining an intermediate fan blade passing order or defining multiples of the intermediate fan blade passing order,
- wherein both the inner fan blade passing order or multiples thereof and the intermediate fan blade passing order or multiples thereof are within one blade passing order of the outer fan blade passing order so as to provide masking of the outer fan blade passing order.
A low tone axial flow fan structure comprising:
- a hub,
- an inner fan including a number of inner blades attached to the hub and extending radially outwardly to a first circumferentially extending blade support structure,
- an outer fan including outer blades, the number of outer blades being the same as the number of inner blades, with each outer blade being generally adjacent to an inner blade, the outer blades being attached to the first circumferentially extending blade support structure and extending radially outwardly to a second circumferentially extending blade support structure,
- wherein a leading edge of each inner blade is shifted with respect to a leading edge of an adjacent outer blade.
Dependencies are inferred from the claim text.