Composite fan blade structure

Abstract

A composite fan blade structure has a rotation axis, which defines the axial, radial, and circumferential directions. The composite fan blade structure includes a hub, multiple inner ring blades, multiple outer ring blades, and a wheel carrier. The inner ring blades are disposed around the outer periphery of the hub and connected only to the hub. Each inner ring blade is inclined relative to the rotation axis, and the extension direction of each inner ring blade has both axial and circumferential components. The outer ring blades are disposed around the outer periphery of the inner ring blades and maintain a radial space between them. Each outer ring blade extends radially. The wheel carrier connects the hub and the outer ring blades.

Claims

1. A composite fan blade structure having a rotation axis, wherein the rotation axis defines an axial direction, a radial direction, and a circumferential direction, the composite fan blade structure comprising: One wheel hub; Multiple inner ring blades are disposed on the outer periphery of the hub and connected only to the hub. Each inner ring blade is inclined relative to the rotation axis, and the extension direction of each inner ring blade has both an axial component and a circumferential component. Multiple outer ring blades are disposed on the outer periphery of the inner ring blades and maintain a radial space with the inner ring blades. Each outer ring blade extends radially. A wheel frame is connected to the hub and the outer ring blades.

2. The composite fan blade structure as described in claim 1, wherein the inclination angle of each inner ring blade from its inner end connected to the hub to its outer end is varied to form a torsion structure.

3. The composite fan blade structure as described in claim 1, wherein each of the inner blades has a variable thickness in the circumferential direction, the variable thickness being distributed from the leading edge of the inner blade toward its trailing edge in a manner that first increases and then decreases.

4. The composite fan blade structure as described in claim 1, wherein the wheel frame includes a plurality of connecting portions and an inner support ring, the connecting portions extending radially outward from the hub and connected to the inner support ring, the inner support ring being connected to the outer ring blades.

5. The composite fan blade structure as described in claim 4, wherein the connecting portions are offset from the inner blades in the circumferential direction.

6. The composite fan blade structure as described in claim 4, wherein the inner support ring is disposed axially on the top side of each of the outer ring blades.

7. The composite fan blade structure as described in claim 4, wherein each of the outer ring blades is connected to the inner support ring near the inner end of the hub, and each of the outer ring blades extends radially outward from the inner support ring away from the outer end of the hub.

8. The composite fan blade structure as described in claim 7, wherein the wheel frame further includes an outer support ring, and the outer end of each of the outer ring blades is connected to the outer support ring.

9. The composite fan blade structure as described in claim 8, wherein the outer support ring is disposed axially on the top side of each of the outer ring blades.

10. The composite fan blade structure as described in claim 8, wherein the hub, the inner ring blades, the outer ring blades, the connecting portions, the inner support ring, and the outer support ring are integrally formed components.

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