CN1746514A - Cooling fan and its fan frame structure - Google Patents

Abstract

The invention provides a heat radiation fan with an upward flow deflector, which comprises a heat radiation fan, a fan body and a fan cover, wherein the heat radiation fan comprises a frame body; the impeller is provided with a hub and a plurality of fan blades which are annularly arranged around the hub; a base arranged in the frame body for bearing the impeller thereon; and a flow guide assembly arranged between the base and the frame body, wherein one end edge of the flow guide assembly positioned on the windward side or the leeward side forms an inclined included angle with a horizontal line vertical to the axis of the heat dissipation fan.

Description

Cooling fan and its fan frame structure

technical field

The invention relates to a cooling fan and its fan frame structure, in particular to an axial flow cooling fan and its fan frame structure.

Background technique

In general electronic products (such as computers), since the electronic components in them generate a lot of heat during operation, if they are kept at high temperature, it will easily lead to wear and tear of the electronic components and shorten their lifespan. Therefore, in order to prevent electronic components from malfunctioning, cooling fans are generally provided therein to dissipate the heat generated inside to the outside.

Please refer to FIG. 1 , which is a conventional axial flow fan, which has a casing 10 , a motor 11 and an impeller 12 . The casing 10 has a base 14 for receiving the motor 11 , and a plurality of strip-shaped support rods or vanes 13 are provided at the air outlet end of the casing 10 . When the motor drives the impeller 12 to rotate, the blades 121 on it will drive the airflow to blow out towards the air outlet end of the casing 10 . Because the upper edge of the support bar or the vane 13 is horizontal, the airflow brought by the rotation of the blade 121 on the windward side will arrive at the support bar or the vane 13 at the same time, and the bottom edge of the blade 121 and the support bar Or the distance h between the upper edges of the vane 13 is relatively short, and when the airflow passes through it, a large noise value and poor sound quality will be generated in a short time.

Therefore, in view of the defects of the prior art, the present invention finally develops the "radiating fan and its fan frame structure" of the present invention through careful testing and research and in the spirit of perseverance. The following is a brief description of the invention.

Contents of the invention

The main purpose of the present invention is to provide a cooling fan and its fan frame structure, which can greatly reduce the disturbance noise and increase the wind pressure and air volume.

Another object of the present invention is to provide a heat dissipation fan and its fan frame structure, which utilizes the design of the upward-type air guiding component to improve noise and improve its overall heat dissipation efficiency.

According to a conception of the present invention, the cooling fan includes a frame; an impeller with a hub and a plurality of fan blades arranged around the hub; a base set in the frame to bear the The impeller is on it; and a flow guide assembly is arranged between the base and the frame body, wherein one end edge of the flow guide assembly forms a first inclined angle with a horizontal line perpendicular to the axis of the cooling fan, and the second An included angle of inclination is preferably 3°-45°.

In addition, the other end edge of the flow guide component and the horizontal line may form a second angle of inclination, the second angle of inclination is preferably 3°-45°, wherein the first angle of inclination is greater than, equal to or smaller than the first angle of inclination Two inclined angles.

In addition, one end edge of the fan blade may form a third inclined angle with the horizontal line, and the third inclined angle is preferably 3°˜45°. And the other end edge of the fan blade can also form a fourth angle of inclination with the horizontal line, the fourth angle of inclination is preferably 3°-45°, wherein the third angle of inclination is greater than, equal to or smaller than the fourth angle of inclination Inclined angle.

The air guiding component can be located at the air outlet end or the air inlet end of the cooling fan, wherein one end of the air guiding component is connected to the base, and the other free end extends toward the inner wall of the frame; or the guiding component One end of the flow assembly is connected to the inner wall of the frame, and the other free end extends toward the base; or, one end of a part of the flow guide assembly is connected to the inner wall of the frame, and the other free end Extending toward the base, one end of the other part is connected to the base and the other free end extends toward the inner wall of the frame. The cross section of the flow guiding component from the base to the inner wall of the frame body is gradually reduced or increased, or the flow guiding component is in a concave or convex shape.

Preferably, the frame body, the base and the flow guide assembly are integrally formed by injection molding, and the material used may be plastic, metal or other similar materials, wherein the number of the flow guide assembly is less than the number of the fan blades number, and it can be a strip, curved, trapezoidal or airfoil structure. The frame can be a square, rectangular or circular structure.

In addition, the fan blade is a curved arc or airfoil structure with an inclination angle ranging from 15° to 60°.

The heat dissipation fan further includes an iron shell sleeved in the wheel hub, which has a plurality of holes, and the top edge of the iron shell has a stepped structure corresponding to the slope or curved surface structure of the top edge of the wheel hub.

The cooling fan further includes a driving device, which is arranged in the iron shell or the hub, and is used to drive the impeller to rotate to generate air flow.

In addition, the frame body has a flared portion located at the air outlet or air inlet of the cooling fan to increase the air flow in and out. between extensions. Preferably, the plurality of support rods or stationary vanes are connected between the flared portion and the base; or, one end of the plurality of support rods or stationary vanes is connected to the base, while the other free end faces The expansion part extends; or, one end of the plurality of support rods or stator blades is connected to the expansion part, and the other free end extends toward the base; or, the plurality of support rods or One end of a part of the stationary vane is connected to the expanded portion and the other free end extends toward the direction of the base, and one end of the other part is connected to the base and the other free end extends toward the direction of the expanded portion. Wherein, the cross-section of the support rod or the stator blade changes from the base to the flared portion gradually shrinks or increases, and the height of the inner edge of the fan blade is lower than the height of the top surface of the hub.

According to another idea of the present invention, the cooling fan includes a frame; an impeller with a hub and a plurality of fan blades arranged around the hub, wherein the top peripheral portion of the hub has an inclined surface or a curved surface, And the hub further has an axial part, the inner edge of the top of the fan blade is connected to the junction of the inclined surface or curved surface and the axial part; a base is arranged in the frame to bear the The impeller is on it, wherein the top edge of the fan blade forms an inclined angle with a horizontal line perpendicular to the axis of the cooling fan, and the bottom edge of the fan blade forms another inclined angle with a horizontal line perpendicular to the axis of the cooling fan , the inclination angle of the top edge of the fan blade is not equal to the inclination angle of the bottom edge of the fan blade; One of the end edges of the side or the leeward side forms an angle with a horizontal line perpendicular to the axis of the cooling fan, and the angle ranges from 3° to 45°.

The present invention can be better understood through the detailed description of the following drawings and embodiments.

Description of drawings

FIG. 1 is a cross-sectional view of a traditional and commonly used axial flow fan.

Fig. 2 is a cross-sectional view of the first preferred embodiment of the cooling fan of the present invention.

FIG. 3 is a cross-sectional view of a second preferred embodiment of the cooling fan of the present invention.

FIG. 4 is a cross-sectional view of a third preferred embodiment of the cooling fan of the present invention.

FIG. 5 is an exploded perspective view of a fourth preferred embodiment of the cooling fan of the present invention.

FIG. 6 is a cross-sectional view of a fifth preferred embodiment of the cooling fan of the present invention.

Fig. 7 is a cross-sectional view of a sixth preferred embodiment of the cooling fan of the present invention.

Fig. 8 is a sectional view of the seventh preferred embodiment of the cooling fan of the present invention.

Fig. 9 is a comparison chart of air pressure and air volume characteristics between the heat dissipation fan of the present invention and the traditional common axial flow fan.

Explanation of reference signs:

10: shell seat

11: motor

12: impeller

121: blade

13: Support rod

14: base

20: frame

20a, 20b: Expansion

20c: Cylindrical part

21: Base

22: impeller

221: hub

221a: Inclined or curved structure

221b: cooling holes

221c: axial part

222: fan blade

222': blade

23: diversion components

24: Drive device

25: iron shell

25a: hole

25b: Ladder-like structure

A: axis

H: Horizontal line

2': Second cooling fan

Detailed ways

First, please refer to FIG. 2 , which shows a first preferred embodiment of the cooling fan of the present invention. The cooling fan includes a frame body 20; a base 21 arranged in the frame body 20; 23 is located at the air outlet side of the cooling fan. Certainly, the air guiding component 23 can also be arranged on the air inlet side of the cooling fan, or be located on the air inlet side and the air outlet side of the cooling fan at the same time. The heat dissipation fan has an impeller 22, which has a hub 221 and a plurality of fan blades 222 arranged around the hub. The top periphery of the hub 221 has a curved structure 221a to guide more air flow to The fan blade 222 . In addition to the square structure shown in FIG. 2 , the shape of the frame can also be a rectangle or a circle. The frame body 20 , the base 21 and the plurality of flow guiding components 23 can be made by integral injection molding, and the materials used can be plastic, metal or other similar materials.

The heat dissipation fan also includes an iron shell 25, the hub 221 is sleeved outside the iron shell 25, and the top of the iron shell has a plurality of holes 25a, so that the heat generated by the heat dissipation fan can be quickly dissipated to the outside. The top peripheral edge of the iron shell also has a stepped structure 25b corresponding to the inclined plane or curved arc-shaped structure 221a of the hub 221 . The cooling fan further includes a driving device 24 disposed in the iron shell 25 or the hub 221 for driving the impeller 22 to generate air flow.

The frame body 20 has a flared portion 20a positioned at the air outlet end of the cooling fan, and another flared portion 20b positioned at the air inlet end of the cooling fan to increase the air flow in and out of the cooling fan and guide it smoothly. Air flows to the impeller. The plurality of flow guide components 23 are connected between the expanded portion 20a and the base 21, and the arrangement of the plurality of flow guide components 23 is not limited thereto, and can be changed and designed according to actual applications. For example, one end of the plurality of flow guiding components 23 is connected to the base 21, and the other free end extends toward the direction of the flared portion 20a; or, one end of the plurality of flow guiding components 23 is connected to On the expanded portion 20a, the other free end extends toward the base 21; more alternatively, one end of a part of the plurality of deflector components 23 is connected to the expanded portion 20a, and the other free end faces toward the base 21. The base 21 extends in the direction, and one end of the other part is connected to the base 21 and the other free end extends in the direction of the flared portion 20a. In addition, the cross-sectional shape of the flow guide component 23 from the base to the flared portion can be consistent and fixed, and the cross-sectional shape of the flow guide component 23 from the base to the flared portion can also be gradually reduced. or increase, or the flow guiding component can be in a concave or convex shape.

As shown in Figure 2, the top edge of the air guide assembly 23 on the windward side is inclined, and the inclination angle between the top edge of the air guide assembly 23 and the horizontal line H perpendicular to the axis A of the cooling fan is θ1, which is preferably The included angle range can be 3°-45°. Since the top edge of the air guiding element 23 forms an angle θ1 with the horizontal line H, it can disperse the time for the air flow brought by the rotation of the impeller to reach the air guiding element, so as to reduce the noise generated by it.

Referring now to Fig. 3, it shows the second preferred embodiment of the cooling fan of the present invention, its structure is roughly similar to the above-mentioned first preferred embodiment, the difference between the two is that the top edge of the air guide assembly is horizontal, And the inclination angle between the bottom end edge of the air guiding component on the leeward side and the horizontal line H of the bottom surface of the base is θ2, and the preferred angle range can be 3° to 45°, which can also disperse the air flow and the air guiding element. The contact time of the components 23 is used to reduce the noise level and improve the sound quality.

Please also refer to Fig. 4, which shows the third preferred embodiment of the cooling fan of the present invention, its structure is roughly similar to the above-mentioned first preferred embodiment, the difference between the two is that it has the same as the above-mentioned first preferred embodiment In addition to the first angle θ1 between the top edge of the air guide element 23 and the horizontal line H, the second angle θ2 is formed between the bottom edge of the air guide element 23 and the horizontal line H. Wherein, the first angle of inclination θ1 may be greater than, equal to or smaller than the second angle of inclination θ2.

Referring to Fig. 5 again, it shows the fourth preferred embodiment of the cooling fan of the present invention, its structure is roughly similar to the above-mentioned third preferred embodiment, the difference between the two is that one end of the air guide assembly 23 of this embodiment is fixed On the base, the other end is connected to the inner wall of the cylindrical part of the frame, and its top edge and bottom edge are all inclined; and the third preferred embodiment shown in Figure 4 is the flow guide assembly One end of 23 is fixed on the base, and the other end is simultaneously connected to the inner wall 20c of the cylindrical part of the frame and the inner wall 20a of the expanded part.

In addition, please refer to FIG. 6 , which shows a fifth preferred embodiment of the cooling fan of the present invention, the structure of which is to connect two cooling fans of the third preferred embodiment as shown in FIG. 4 in series. Since the bottom edge of the air guide assembly 23 in the first heat dissipation fan 2 is designed to rise, the distance d between it and the upper edge of the blade 222' of the second heat dissipation fan 2' is not the same, which can also effectively reduce its noise. . The frame body of the first cooling fan 2 and the frame body of the second cooling fan 2' can be assembled by screwing, buckling, riveting or bonding; or, the two can be integrally injection molded to form a single The frame is used for connecting the two impellers in series.

Please refer to FIG. 7, which shows the sixth preferred embodiment of the cooling fan of the present invention, its structure is roughly similar to the third preferred embodiment shown in FIG. The first angle of inclination between the top edge and the horizontal line H is beyond θ1 and the second angle of inclination between the bottom end edge of the flow guide component and the horizontal line H is beyond θ2, the fan blade 222 is on the side near the air inlet The top edge and the horizontal line H have a third angle of inclination of θ3, and the bottom edge of the fan blade 222 on the side near the air outlet has a fourth angle of inclination of θ4 with the horizontal line H, and it is an upward fan blade. Design, which can spread the time for the airflow brought by the fan blades 222 to reach the flow guide assembly 23 . A preferred range of the third or fourth included angle of inclination is 3°-45°, wherein the third included angle of inclination may be greater than, equal to or smaller than the fourth included angle of inclination.

In addition, please refer to Fig. 8, which shows the seventh preferred embodiment of the cooling fan of the present invention, its structure is roughly similar to the sixth preferred embodiment shown in Fig. 7 above, the difference between the two is that the iron shell 25 It is embedded in the hub 221 without being exposed to the outside, and the hub 221 can be divided into three parts-there are a plurality of cooling holes 221b on its top surface, and the heat generated by the internal operation of the fan can pass through the iron shell. The hole 25a is then dissipated to the outside through the plurality of heat dissipation holes 221b; the peripheral part of its top is a curved arc-shaped structure 221a (that is, the so-called R angle); its axial part 221c is connected with the fan blade 222, the fan The inner edge of the top side of the blade is connected to the junction of the axial portion 221c and the arc-shaped structure 221a, which can reduce the generation of noise, while the inner edge of the bottom side of the fan blade is slightly higher than the bottom end of the axial portion 221c, The generation of burrs can be reduced. The third inclination angle θ1 between the top edge of the fan blade 222 and the horizontal line H is not equal to the fourth inclination angle θ2 between the bottom edge of the fan blade 222 and the horizontal line H.

In all the above-mentioned embodiments, the connection arrangement of the plurality of deflector components 23 can be that one end is connected to the base 21 and the other end is only connected to the inner wall of the cylindrical portion 20c of the frame body 20; or, one end is connected to the The base and the other end are simultaneously connected to the inner wall of the cylindrical portion 20c of the frame and the inner wall of the expanded portion 20a. Of course, the flow guiding component 23 is not limited to the inclined shape of the top edge and the bottom edge at the same time, and only one of the edge edges can be selected to be inclined in practical application. In addition, as shown in FIG. 5, the shape of the flow guide assembly 23 can be a strip shape, a curved arc shape, a trapezoidal shape or an airfoil structure, and the number of the flow guide assembly 23 can be smaller than the number of the fan blades, and The fan blades 222 may be curved or airfoil-shaped.

Finally, please refer to Fig. 9, which is a comparison chart of the air volume and wind pressure characteristics between the cooling fan of the present invention and the conventional axial flow fan (as shown in Fig. The flow assembly 23 can increase wind pressure and air volume, and can also greatly reduce the noise of disturbing flow. For example, at the same characteristic at the same rotational speed of 7500rpm, the fan with the upward-type air guide assembly 23 of the present invention reduces the noise by at least 5 dBA compared with the traditional commonly used axial flow fan.

Of course, those skilled in the art can make some improvements or changes to the present invention, but these improvements or changes are all included in the scope defined by the claims of the present invention.

Claims (26)

1. radiation fan, it comprises:

One framework;

One impeller, have a wheel hub and a plurality of described wheel hub flabellum on every side that is located on, the peripheral part, top of wherein said wheel hub has an inclined-plane or curved surface, and described wheel hub also has an axial component, and the top inner side edge of described flabellum is connected in the boundary of described inclined-plane or curved surface and described axial component and builds;

One pedestal, be arranged in the described framework, in order to the described impeller of bearing thereon, the top edge of wherein said flabellum be a slanted angle perpendicular to the horizontal line of described radiation fan axis, the bottom edge of described flabellum be another slanted angle perpendicular to the horizontal line of described radiation fan axis, the slanted angle of the slanted angle of described flabellum top edge and described flabellum bottom edge is unequal; And

One guiding subassembly, be arranged between described pedestal and the described framework, wherein be positioned at a wherein ora terminalis of the windward side of described guiding subassembly or leeward side and be a slanted angle with horizontal line perpendicular to described radiation fan axis, the scope of described slanted angle is between 3 °～45 degree.

2. radiation fan as claimed in claim 1, the bottom inner side edge of wherein said flabellum is a little more than the bottom of described axial component.

3. radiation fan, it comprises:

One framework;

One impeller has a wheel hub and a plurality of described wheel hub flabellum on every side that is located on;

One pedestal is arranged in the described framework, in order to the described impeller of bearing thereon; And

One guiding subassembly, be arranged between described pedestal and the framework, wherein be positioned at a wherein ora terminalis of the windward side of described guiding subassembly or leeward side and be a slanted angle with horizontal line perpendicular to described radiation fan axis, the scope of described slanted angle is between 3 °～45 degree.

4. radiation fan as claimed in claim 3, wherein be positioned at described guiding subassembly windward side described guiding subassembly ora terminalis slanted angle greater than, be equal to or less than the slanted angle of the described guiding subassembly ora terminalis that is positioned at described guiding subassembly leeward side.

5. radiation fan, it comprises:

One framework;

One impeller has a wheel hub and a plurality of described wheel hub flabellum on every side that is located on;

One pedestal is arranged in the described framework, in order to the described impeller of bearing thereon; And

One guiding subassembly is arranged between described pedestal and the framework, a wherein ora terminalis of wherein said guiding subassembly be one first slanted angle perpendicular to the horizontal line of described radiation fan axis.

6. radiation fan as claimed in claim 5, wherein said first slanted angle is 3-45 °.

7. radiation fan as claimed in claim 5, another ora terminalis of wherein said guiding subassembly and described horizontal line are one second slanted angle.

8. radiation fan as claimed in claim 7, wherein said second slanted angle are 3 °～45 °.

9. radiation fan as claimed in claim 7, wherein said first slanted angle greater than, be equal to or less than described second slanted angle.

10. as claim 5 or 7 described radiation fans, an ora terminalis of wherein said flabellum and described horizontal line are one the 3rd slanted angle.

11. radiation fan as claimed in claim 10, wherein said the 3rd slanted angle are 3 °～45 °.

12. radiation fan as claimed in claim 10, another ora terminalis of wherein said flabellum and described horizontal line are one the 4th slanted angle.

13. radiation fan as claimed in claim 12, wherein said the 4th slanted angle are 3 °～45 °.

14. radiation fan as claimed in claim 12, wherein said the 3rd slanted angle greater than, be equal to or less than described the 4th slanted angle.

15. radiation fan as claimed in claim 5, wherein said guiding subassembly are positioned at the air opening end or the wind inlet end of described radiation fan.

16. radiation fan as claimed in claim 5, a wherein end of wherein said guiding subassembly is connected in described pedestal, and its another free end extends towards described framework madial wall direction; Or a wherein end of described guiding subassembly is connected in described framework madial wall, and its another free end extends towards described pedestal direction; Or a wherein end of a part of described guiding subassembly is connected in described framework madial wall and another free end extends towards described pedestal direction, and an end of another part is connected in described pedestal and another free end extends towards described framework madial wall direction.

Dwindle or increase 17. radiation fan as claimed in claim 5, wherein said guiding subassembly are gradual from described pedestal to the changes of section of described framework madial wall direction, or be the shape of inner concave shape or male type.

18. radiation fan as claimed in claim 5, wherein said framework, described pedestal and described guiding subassembly integrated injection molding, the material of described framework, described pedestal and described guiding subassembly are plastics, metal or other similar material.

19. radiation fan as claimed in claim 5, the number of wherein said guiding subassembly is less than the number of described flabellum, described guiding subassembly can be the structure of strip, arc shape, ladder type or aerofoil profile, and described framework is a square, rectangular or round structure.

20. radiation fan as claimed in claim 5, wherein said flabellum is an arc shape or airfoil structure, has a tilt angle, and its scope is between 15 °～60 ° angles.

21. radiation fan as claimed in claim 5, wherein also comprise an iron-clad, be socketed in the described wheel hub, it has a plurality of holes, the top periphery of described iron-clad has step structure, and described radiation fan also comprises a drive unit, is arranged in described iron-clad or the described wheel hub, in order to drive described wheel rotation, to produce air-flow.

22. radiation fan as claimed in claim 5, the top periphery of wherein said wheel hub has inclined-plane or curved surface structure.

23. radiation fan as claimed in claim 5, wherein said framework has an expanding part, is positioned at the air opening end or the wind inlet end of described radiation fan, to increase its turnover air quantity, described guiding subassembly comprises a plurality of struts or stator blade, between described pedestal and described expanding part.

24. radiation fan as claimed in claim 23, wherein said a plurality of strut or stator blade are connected between described expanding part and the described pedestal, a wherein end of wherein said a plurality of strut or stator blade is connected in described pedestal, and its another free end extends towards described expanding part direction; Or a wherein end of described a plurality of strut or stator blade is connected in described expanding part, and its another free end extends towards described pedestal direction; Or a wherein end of a part of described a plurality of strut or stator blade is connected in described expanding part and another free end extends towards described pedestal direction, and an end of another part is connected in described pedestal and another free end extends towards described expanding part direction.

25. radiation fan as claimed in claim 5 wherein also comprises:

One second impeller has a wheel hub and a plurality of flabellum that is located on around the described wheel hub, and with described impeller serial together; And

One second framework, in order to ccontaining described second impeller in wherein.

26. radiation fan as claimed in claim 25, wherein said second framework by screw togather, fastening, riveted or bonding mode and be connected with group with described framework; Perhaps described second framework and described framework integrated injection molding.

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