Cooling fan device

Abstract

This case discloses a cooling fan device, comprising a base, a motor module, a hollow rotor, a support column, and a fan blade assembly. In the cooling fan device, the base has an accommodating space and an opening at its upper open end. The motor module is located within the accommodating space and has a central region. The hollow rotor is located within the accommodating space and mounted on the motor module, so as to drive the hollow rotor to rotate via the motor module. The support column has a first end and a second end, is located in the central region, and its first end is connected to the base or the motor module, wherein the height of the support column is greater than the height of the hollow rotor. The fan blade assembly is connected to the hollow rotor and extends outward from the outer periphery of the hollow rotor to rotate with the hollow rotor.

Claims

1. A cooling fan device, comprising: a base having an accommodating space and an opening at its upper open end; a motor module located within the accommodating space, the motor module having a central region; a hollow rotor located within the accommodating space and disposed on the motor module, for driving the hollow rotor to rotate via the motor module; a support column having a first end and a second end, the support column being located in the central region and the first end being connected to the base, the height of the support column being higher than the height of the hollow rotor; and a fan blade assembly connected to the hollow rotor and extending outward from the outer periphery of the hollow rotor to rotate with the hollow rotor.

2. The cooling fan device as claimed in claim 1, wherein the motor module further comprises: a hollow control circuit board located within the accommodating space, the hollow portion being part of the intermediate region; a bearing located within the accommodating space and situated on the hollow control circuit board, the bearing being situated around the support column; and a coil assembly located on the hollow control circuit board and surrounding the bearing, such that the hollow rotor portion is disposed on the bearing and the coil assembly.

3. The cooling fan device as described in claim 2, wherein the second end of the support column protrudes beyond the opening.

4. The cooling fan device as described in claim 2, wherein the support column and the base are integrally formed.

5. The cooling fan device as claimed in claim 1, wherein the second end of the support column protrudes beyond the opening.

6. The cooling fan device as described in claim 1, wherein the support column and the base are integrally formed.

7. The cooling fan device as claimed in claim 1, wherein the base is made of metal and the support column is welded to the base.

8. A cooling fan device, comprising: a base having an accommodating space and an opening at an upper open end; a motor module located within the accommodating space, the motor module having a central region; a hollow rotor located within the accommodating space and disposed on the motor module, for driving the hollow rotor to rotate via the motor module; a support column having a first end and a second end, the support column being located in the central region and the first end being connected to the motor module, the height of the support column being higher than the height of the hollow rotor; and a fan blade assembly connected to the hollow rotor and extending outward from the outer periphery of the hollow rotor to rotate with the hollow rotor.

9. The cooling fan device as claimed in claim 8, wherein the motor module further comprises: a control circuit board located within the accommodating space; a bearing located within the accommodating space, the bearing having a central region formed therein, such that the support column is located in the central region and connected to the bearing; and a coil assembly located on the control circuit board and surrounding the bearing, such that the hollow rotor portion is disposed on the bearing and the coil assembly.

10. The cooling fan device as claimed in claim 9, wherein the second end of the support column protrudes beyond the opening.

11. The cooling fan assembly as claimed in claim 9, wherein the support column and the bearing are integrally formed and located on the control circuit board.

12. The cooling fan device as claimed in claim 9, wherein the control circuit board is a hollow control circuit board located outside the bearing.

13. The cooling fan assembly as claimed in claim 12, wherein the bearing system and the base are assembled together with an interference fit, and the first end of the support column is assembled together with the bearing with an interference fit.

14. The cooling fan device as claimed in claim 8, wherein the second end of the support column protrudes beyond the opening.

15. The cooling fan device as described in claim 8, wherein the base is made of metal.

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