CN101008399B - Fan and impeller thereof - Google Patents

Abstract

The invention discloses a fan, which comprises an impeller and a motor, wherein the impeller comprises a hub part and a plurality of fan blades, the hub part is provided with a top part, a connecting part and at least one flow guide structure, and the top part is connected with the connecting part. The fan blades are annularly arranged on the connecting part. The motor is arranged corresponding to the impeller and used for driving the impeller to rotate. The flow guiding structure is positioned on the hub part which is higher than the windward side of the fan blade.

Description

Fan and its impeller

technical field

The invention relates to a fan and its impeller, in particular to a fan and its impeller capable of reducing noise and increasing air volume.

Background technique

With the rapid development of electronic products towards high performance, high frequency, high speed and thinness, the heating temperature of electronic products is also getting higher and higher. Using fans as heat dissipation devices is a common structural setting. Among them, the wind pressure and air volume are the fan. The performance is an important reference basis, and at the same time, the noise of the fan has also become an important reference factor.

Please refer to Figure 1, a conventional fan 1 includes an impeller 11 and a motor (not shown), the impeller 11 includes a hub 111 and a plurality of fan blades 112, the fan blades 112 are ringed and Connected to the periphery of the hub 111, the periphery of the hub 111 has an annular chamfer 1111, the chamfer 1111 is rounded, and is mainly used to guide the airflow around the hub 111 into the blades 112 to improve the fan 1 air intake efficiency.

However, when the curvature of the chamfer 1111 is increased, a large turning wind resistance area will be generated at the intake end of each fan blade 112 , and the efficiency of the fan 1 will be reduced. If the curvature of the chamfer 1111 is reduced, the airflow around the hub portion 111 cannot be guided into the fan blades 112 . Moreover, since the air intake area of each fan blade 112 is formed by the upper edge of two adjacent fan blades, no matter what the angle of the chamfer 1111 is, the air intake area of each fan blade 112 remains unchanged, resulting in the fan 1 The air intake efficiency cannot be improved.

In addition, please refer to FIG. 2 , no matter what the angle of the annular chamfer 1111 is, after the airflow is introduced into the blades 112, the airflow will generate a vortex 1121 and air stripping on the blade surface of each blade 112, thereby affecting Fan 1 operates efficiently and generates noise.

Therefore, how to provide a fan and its impeller to increase the actual air intake of the fan blade, reduce the noise of the impeller during operation, and even improve the overall performance of the fan is one of the important issues at present.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a fan and its impeller and hub which can improve air intake efficiency, reduce noise, and improve overall performance.

In order to achieve the above object, an impeller according to the present invention includes a hub and a plurality of fan blades, the hub has a top, a connecting portion, a guide angle and a plurality of first guide structures, the guide angle is set between the top and the connection part and connected into one body. The fan blade rings are arranged on the connecting portion, the first air guide structure is located on the guide angle and is higher than the windward surface of the fan blade, or the first air guide structure is located on the guide angle and is located between the fan blade and the The connecting parts are connected on the extension line of the ends.

To achieve the above purpose, a fan according to the present invention includes an impeller and a motor. A hub and a plurality of fan blades, the hub has a top, a connecting portion and at least one flow guiding structure, the top is connected to the connecting portion. Each blade ring is disposed on the connecting portion. The motor is configured correspondingly to the impeller, and is used to drive the impeller to rotate. The air guide structure is located on the hub portion higher than the windward surface of the fan blade.

Based on the above, a fan and its impeller according to the present invention are provided with at least one guide structure to increase the air inlet area of the blade or change the flow field between the blades when the air flow is introduced, thereby reducing wind resistance and improving air intake. Efficiency, and avoid vortex and air stripping on the fan blades, reduce noise, and improve the overall performance of the fan.

Description of drawings

Fig. 1 is the schematic diagram of a kind of existing fan;

Fig. 2 is a schematic diagram of airflow flowing through a conventional hub and fan blade;

3 is a schematic diagram of a fan according to a preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of a fan according to another preferred embodiment of the present invention; and

FIG. 5 is a schematic diagram of airflow flowing through the hub and the fan blades in FIG. 4 .

Description of component symbols:

1, 2, 3: Fan 11, 21, 31: Impeller

111, 211, 311: hub 1111, 2113: chamfer

112, 212: fan blade 1121: vortex

2111: Top 2112: Connection

2114, 3114: diversion structure

Detailed ways

A fan and its impeller according to preferred embodiments of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same reference symbols.

Please refer to FIG. 3, a fan 2 according to a preferred embodiment of the present invention includes an impeller 21 and a motor (not shown), the fan 2 can be an outer rotor axial fan or an inner rotor axial fan . The motor is connected to drive the impeller 21 to rotate, and can be arranged inside the impeller 21 or outside the impeller 21 .

The impeller 21 includes a hub portion 211 and a plurality of fan blades 212 . The hub portion 211 has a top portion 2111 , a connecting portion 2112 and at least one flow guiding structure 2114 . In this embodiment, the air guiding structure 2114 is disposed between the air inlet ends of two adjacent fan blades, and extends to the top 2111 . The air guiding structure 2114 is preferably disposed between the air inlet ends of two adjacent fan blades. The direction of the flow guiding structure 2114 matches the direction of the flow field of the fan 2 or the fan blade 212 . In addition, the flow guide structure 2114 can also extend to the connecting portion 2112 and/or the blade surface of each fan blade 212 as required. The flow guide structure 2114 can be a groove or a protrusion, wherein the protrusion can be block or rib. The shape of the flow guide structure 2114 can be polygonal, circular, oval or other specific shapes.

The number of the flow guiding structures 2114 may be equal to or different from the number of the fan blades 212 . For example, between two adjacent fan blades 212 , the number of the flow guiding structures 2114 is zero, one or more. The flow guiding structure 2114 is integrally formed on the hub portion 211 , specifically, the connecting portion 2112 , the top 2111 and the flow guiding structure 2114 are integrally formed.

The hub portion 211 further has a chamfer 2113 , the chamfer 2113 is located between the top portion 2111 and the connection portion 2112 , and is connected with the top portion 2111 and the connection portion 2112 . The chamfer 2113 is a right angle, an oblique angle, an elliptical angle or a rounded angle. Specifically, the chamfer 2113 is an annular structure. The chamfer 2113 is integrally formed on the hub portion 211 , specifically, the chamfer, the connecting portion 2112 , the top 2111 and the flow guiding structure 2114 are integrally formed. In addition, the flow guiding structure 2114 extends to the chamfer 2113 .

Each fan blade 212 is arranged around and connected to the periphery of the connecting portion 2112 , and the tip of the fan blade 212 can extend to the top of the connecting portion 2111 , the chamfer 2113 or the edge of the top 2111 . The fan blades 212 and the hub portion 211 can be formed integrally or independently. The fan blades 212 are curved fan blades, flat fan blades, polygonal fan blades, curved fan blades or other axial flow fan blades.

In this embodiment, since the air guiding structure 2114 is located between two adjacent fan blades 212, and because the air guiding structure 2114 extends from the top 2111 to between the two fan blades 212, the two fan blades can be effectively increased. The air intake area between the blades 212 can greatly improve the air intake volume and heat dissipation effect of the fan 2 .

Please refer to the fan 3 and its flow field of another preferred embodiment of the present invention shown in FIG. 4 and FIG. The hub 211 is preferably located at or higher than the extension line of the end connecting the fan blade 212 and the hub 311 . The air guiding structure 3114 can contact the airfoil or the leading edge of the fan blade 212 , or extend through the airfoil or the leading edge of the fan blade 212 . Since the air guide structure 3114 is located higher than the top of the fan blade 212, it can effectively smooth the airflow passing through the surface of the fan blade 212, avoiding the occurrence of vortex or air stripping, and then reducing the operation of the fan 3. amount of noise. In addition, the air guide structure 3114 can also moderately increase the air intake area of the fan blade 212 to obtain the effect of increasing the air intake volume of the fan 3 .

In this embodiment, when the flow guiding structures 3114 are grooves, the amount of noise can be reduced by about 10% to 16%. When each of the flow guide structures 3114 is a convex part, the noise can be reduced by about 7% to 10%.

In addition, it is also possible to form a flow guide structure at the positions where the above-mentioned two flow guide structures are arranged according to the circumstances, so as to obtain the effects of increasing the air intake and reducing noise at the same time.

In summary, according to a fan and its impeller according to the present invention, at least one guide structure is provided to increase the air inlet area of the blade or change the flow field between the blades when the air flow is introduced, so as to reduce wind resistance and improve the air intake. Efficiency, and avoid vortex and air stripping on the fan blades, reduce noise, and improve the overall performance of the fan.

The above descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the appended claims.

Claims (19)

1. fan comprises:

One impeller comprises:

One hub portion has a top, a junction, a lead angle and a plurality of first flow guide structure, and this lead angle is arranged between this top and this joint and links into an integrated entity; And

A plurality of flabellums are located on this joint, and this first flow guide structure is positioned on the lead angle, and are higher than this flabellum windward side or this first flow guide structure and are positioned on the lead angle and are positioned on this flabellum and the end line stretcher that this joint is connected; And

The corresponding configuration with this impeller of one motor is in order to drive this wheel rotation.

2. fan as claimed in claim 1, wherein this first flow guide structure contacts with this flabellum or not contact, and this first flow guide structure extends through or contact the aerofoil or the leading edge of this flabellum.

3. fan as claimed in claim 1, wherein this first flow guide structure is a groove or a protuberance.

4. fan as claimed in claim 1, wherein this first flow guide structure is shaped as polygonal, circle, ellipse or given shape.

5. fan as claimed in claim 1, wherein this first flow guide structure extends to this top, this joint or this each flabellum blade face.

6. fan as claimed in claim 1, wherein this first flow guide structure direction cooperates this flabellum flow field direction.

7. fan as claimed in claim 1, wherein this top, this joint and this first flow guide structure are formed in one.

8. fan as claimed in claim 1, wherein the lead angle that has of this hub portion is right angle, oblique angle, fillet, oval angle or loop configuration body.

9. fan as claimed in claim 8, wherein this each top, flabellum end extends to this lead angle.

10. fan as claimed in claim 8, wherein this first flow guide structure is formed on this lead angle, and corresponding to the position of this flabellum.

11. fan as claimed in claim 1, wherein this each top, flabellum end extends to this joint top or this top.

12. fan as claimed in claim 1, wherein this first flow guide structure be arranged at two adjacent flabellums between or between the two adjacent flabellum wind inlet ends.

13. fan as claimed in claim 1 more comprises one second flow guide structure, is arranged between the two adjacent flabellum wind inlet ends.

14. fan as claimed in claim 13, wherein this second flow guide structure is a groove or a protuberance.

15. fan as claimed in claim 13, wherein this second flow guide structure is shaped as polygonal, circle, ellipse or given shape.

16. fan as claimed in claim 13, wherein this second flow guide structure extends to this top, this joint or this each flabellum blade face.

17. fan as claimed in claim 13, wherein this second flow guide structure direction cooperates this flabellum flow field direction.

18. fan as claimed in claim 13, wherein this top, this joint and this second flow guide structure are formed in one.

19. an impeller comprises:

One hub portion has a top, a junction, a lead angle and a plurality of first flow guide structure, and this lead angle is arranged between this top and this joint and links into an integrated entity; And

A plurality of flabellums are located on this joint, and this first flow guide structure is positioned at and is higher than in this flabellum windward side and this hub portion or is positioned at or is higher than on this flabellum and the end line stretcher that this hub portion is connected, and this first flow guide structure extends to this lead angle.

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