Fan assembly

Patent metadata

Field	Value
Publication number	US-9447789-B2
Application number	US-201213480856-A
Country	US
Kind code	B2
Filing date	May 25, 2012
Priority date	May 26, 2011
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A fan assembly including a housing, a supporting member, a driving device and a passive impeller. The supporting member is disposed in the housing, and the driving device is disposed on the supporting member. The passive impeller includes a first hub and a plurality of first passive blades encircling the first hub. The active impeller includes a second hub and a plurality of active blades encircling the second hub and actuated to rotate by the driving device. In an axial direction, the first hub is disposed between the driving device and the second hub, and through rotation of the active impeller, airflow is produced which actuates the passive impeller to rotate.

First claim

What is claimed is:

1. A fan assembly, comprising:
a housing;
a supporting member, disposed in the housing;
a driving device, disposed on the supporting member;
a passive impeller, comprising a first hub and a plurality of first passive blades encircling the first hub; and
an active impeller, comprising a second hub and a plurality of active blades encircling the second hub and actuated to rotate by the driving device;
wherein the first hub is disposed between the driving device and the second hub, and through an airflow produced by the active impeller, the passive impeller is actuated to rotate;
wherein when the passive impeller is blown by the airflow, the passive impeller rotates so as to increase the total amount of the airflow.

2. The fan assembly as claimed in claim 1 further comprising a shaft, wherein the active impeller is connected to the shaft, and the active impeller is driven by the driving device via the shaft.

3. The fan assembly as claimed in claim 2 further comprising a bushing, wherein the bushing is surrounded by the driving device, and the shaft is telescoped within the bushing.

4. The fan assembly as claimed in claim 3 , wherein the first hub of the passive impeller comprises a protrusion, and the shaft is telescoped within the protrusion, wherein the protrusion extends along a direction toward the driving device or a direction away from the driving device.

5. The fan assembly as claimed in claim 3 , wherein one end of the shaft is connected to the second hub, and another end of the shaft passes through the first hub and is telescoped within the bushing.

6. The fan assembly as claimed in claim 1 , wherein at least a part of the driving device is covered by the first hub, and the first passive blades encircle the driving device.

7. The fan assembly as claimed in claim 1 , wherein the active blades and the first passive blades are disposed correspondingly in an axial direction.

8. The fan assembly as claimed in claim 1 , wherein each of the active blades and each of the first passive blades respectively has a concave surface and a convex surface on two opposite sides, and the concave surfaces of the active blades face the concave surfaces of the first passive blades.

9. The fan assembly as claimed in claim 1 , wherein each of the first passive blades is overlapped by a neighboring first passive blade in an axial direction.

10. The fan assembly as claimed in claim 1 , wherein the housing has an airflow passage penetrating through the housing, and the housing further comprises a chamber configured to receive at least one electronic element.

11. The fan assembly as claimed in claim 1 , wherein a gap is constituted between the active impeller and the passive impeller, such that there is no connection between the active impeller and the passive impeller.

12. The fan assembly as claimed in claim 1 , wherein a rotating direction of the active blades is the same as a rotating direction of the first passive blades.

13. The fan assembly as claimed in claim 1 , wherein the passive impeller further comprises a plurality of second passive blades encircling the first passive blades.

14. The fan assembly as claimed in claim 13 , wherein the passive impeller further comprises a first airflow guiding ring disposed between the first passive blades and the second passive blades to connect the first passive blades to the second passive blades, wherein the first passive blades are connected to an inner wall of the first airflow guiding ring and the second passive blades are connected to an outer wall of the first airflow guiding ring.

15. The fan assembly as claimed in claim 14 , wherein an accommodating space is formed by the inner wall of the first airflow guiding ring, and at least a portion of the active blades are disposed in the accommodating space.

16. The fan assembly as claimed in claim 14 , wherein the inner wall of the first airflow guiding ring is parallel to or inclined with respect to an axis.

17. The fan assembly as claimed in claim 13 , wherein the second passive blades radially encircle the first passive blades.

18. The fan assembly as claimed in claim 13 , wherein the passive impeller further comprises an enforcing ring encircling the outer edges of the second passive blades.

19. The fan assembly as claimed in claim 13 , wherein lengths of the second passive blades are larger than lengths of the first passive blades.

20. The fan assembly as claimed in claim 13 , wherein a direction of the airflow generated by the second passive blades is different from or the same as a direction of the airflow generated by the active blades.

21. The fan assembly as claimed in claim 2 , wherein the passive impeller is rotatably connected to the shaft.

Assignees

• Chang Shun-Chen
• Chen Bo-Chun
• Delta Electronics Inc

Inventors

• Chang Shun-Chen
• Chen Bo-Chun

Classifications

• F04D29/541

  Specially adapted for elastic fluid pumps (F04D29/56 takes precedence) · CPC title

• F04D25/08 Primary

  the working fluid being air, e.g. for ventilation · CPC title