CENTRIFUGAL FAN AND IMPELLER THEREOF

• US 20140308118A1
• Filed: 06/07/2013
• Published: 10/16/2014
• Est. Priority Date: 04/10/2013
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: LIN, Hsin-Chen
• Granted Patent: US 9,995,304 B2
• Time in Patent Office: Days
• US Class Current: 415/203
• CPC Class Codes: F04D 17/16 for displacing without appreciable compression
• CPC Class Codes: F04D 25/0613 the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
• CPC Class Codes: F04D 29/281 for fans or blowers
• CPC Class Codes: F04D 29/30 Vanes
• CPC Class Codes: F04D 29/666 by means of rotor construction or layout, e.g. unequal distribution of blades or vanes

Abstract

A centrifugal fan includes an impeller. The impeller includes a hub, a plurality of connecting structures, an annular structure and a plurality of blades. The hub includes a circumferential surface. The connecting structures are disposed on the circumferential surface of the hub at intervals. Any adjacent two of the connecting structures define a first minimum distance on the circumferential surface. At least two first minimum distances are not equal. The annular structure is connected to the connecting structures. The blades are disposed on the annular structure at intervals.

Claims

1. An impeller, comprising:

a hub having a circumferential surface;

a plurality of connecting structures disposed at intervals and on the circumferential surface of the hub, wherein any adjacent two of the connecting structures define a first minimum distance on the circumferential surface, wherein at least two of the first minimum distances are not equal;

an annular structure connected to the connecting structures; and

a plurality of blades disposed at intervals and on the annular structure.

2. The impeller of claim 1, wherein the amount of the blades and the amount of the connecting structures are primer numbers mutually.

3. The impeller of claim 1, wherein the amount of the blades is greater than the amount of the connecting structures.

4. The impeller of claim 1, wherein the amount of the connecting structures is less than or equal to 13, and the amount of the blades is greater than 13.

5. The impeller of claim 1, wherein the annular structure has an outer annular surface, and any adjacent two of the blades define a second minimum distance on the outer annular surface, wherein at least two of the second minimum distances are not equal or the same.

6. The impeller of claim 1, wherein two of the blades farthest to each other define an outer diameter D, and the annular structure has an annular structure outer diameter d, wherein the outer diameter d and the outer diameter D substantially satisfy a relation of 40%×

D<

d<

85%×

D.

7. The impeller of claim 1, wherein each of the connecting structures has at least one largest surface, and the circumferential surface has a circumferential direction, wherein the circumferential direction is substantially perpendicular to or sloped to the largest surface of each of the connecting structures.

8. The impeller of claim 1, wherein each of the connecting structures has at least one largest surface, and the circumferential surface has a circumferential direction, wherein the circumferential direction is substantially parallel to the largest surface of each of the connecting structures.

9. The impeller of claim 1, wherein the connecting structures are flat, blade-shaped or rib-shaped.

10. An impeller, comprising:

a hub having a circumferential surface;

a plurality of connecting structures disposed at intervals and on the circumferential surface of the hub, wherein each of the connecting structures has two opposite end surfaces, wherein the end surfaces of each of the connecting structures define a minimum distance on the circumferential surface, wherein at least two of the minimum distances are not equal;

an annular structure connected to the connecting structures; and

a plurality of blades disposed at intervals and on the annular structure.

11. The impeller of claim 10, wherein the amount of the blades and the amount of the connecting structures are prime numbers mutually.

12. The impeller of claim 10, wherein the amount of the blades is greater than the amount of the connecting structures.

13. The impeller of claim 10, wherein the amount of the connecting structures is less than or equal to 13, and the amount of the blades is greater than 13.

14. The impeller of claim 10, wherein the annular structure has an outer annular surface, wherein any adjacent two of the blades define a second minimum distance on the outer annular surface, wherein at least two of the second minimum distances are not equal or the same.

15. The impeller of claim 10, wherein each of the connecting structures has at least one largest surface, and the circumferential surface has a circumferential direction, wherein the circumferential direction is substantially parallel to the largest surface of each of the connecting structures.

16. The impeller of claim 10, wherein the connecting structures are blade-shaped or flat rib-shaped.

17. A centrifugal fan, comprising:

a cover having at least one inlet, an outlet and an accommodating space, wherein the inlet, the accommodating space and the outlet are in spatial communication; and

an impeller accommodated in the accommodating space of the cover, the impeller comprising;

a hub having a circumferential surface;

a plurality of connecting structures disposed at intervals and on the circumferential surface of the hub, wherein any adjacent two of the connecting structures define a first minimum distance on the circumferential surface, wherein at least two of the first minimum distances are not equal;

an annular structure connected to the connecting structures; and

a plurality of blades disposed at intervals and on the annular structure.

18. The centrifugal fan of claim 17, wherein the amount of the at least one inlet is plural, and the cover comprises a bottom plate, wherein the bottom plate comprises a plurality of ribs, some of the inlets are disposed on the bottom plate and are separated by the ribs, wherein the projection position that the impeller projects to the bottom plate overlaps with the ribs.

19. A centrifugal fan, comprising:

a cover having at least one inlet, an outlet and an accommodating space, wherein the inlet, the accommodating space and the outlet are in spatial communication; and

an impeller accommodated in the accommodating space of the cover, the impeller comprising;

a hub having a circumferential surface;

a plurality of connecting structures disposed at intervals and on the circumferential surface of the hub, wherein each of the connecting structures has two opposite end surfaces, wherein the end surfaces of each of the connecting structures define a minimum distance on the circumferential surface, wherein at least two of the minimum distances are not equal;

an annular structure connected to the connecting structures; and

a plurality of blades disposed at intervals and on the annular structure.

20. The centrifugal fan of claim 19, wherein the amount of the at least one inlet is plural, and the cover comprises a bottom plate, wherein the bottom plate comprises a plurality of ribs, some of the inlets are disposed on the bottom plate and are separated by the ribs, wherein the projection position that the impeller projects to the bottom plate overlaps with the ribs.