Fan wheel and centrifugal fan

Abstract

The utility model relates to a fan wheel and a centrifugal fan. The fan wheel comprises a hub and a plurality of blades which are formed by outwards diverging and extending from the outer periphery of the hub. And each blade comprises a first section blade, a second section blade and a third section blade. And the first-section blade is connected to the hub. The second-section blade is positioned between the first-section blade and the third-section blade; and the second-section blade is connected with the first-section blade and the third-section blade. Along the outer periphery of the hub outwards, the first section of blade is bent and extends to form a circular arc section, and the third section of blade is bent and extends to form a circular arc section. And the bending directions of the first section blade and the third section blade are opposite. And the circle where the first-section blade is located is not overlapped with the second-section blade. The circle where the third-section leaf is located is not overlapped with the second-section leaf. According to the fan wheel, the wind driving performance can be effectively improved, and the overall performance of the centrifugal fan using the fan wheel is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a fan wheel and a centrifugal fan. BACKGROUND

[0002] With the development of science and technology, computers are updated and replaced more and more quickly, and the heat generated by computer heat sources is also more and more, so that the requirements for the heat dissipation fan inside the computer are also higher and higher.

[0003] The existing heat dissipation device usually uses a centrifugal fan, and the blades of the existing centrifugal fan are usually made of metal or plastic. However, the metal blade is heavy and difficult to shape, and the plastic blade is light in weight, and the blade is usually composed of straight blades or arc-shaped blades, so it is difficult to further reduce the noise of the centrifugal fan, further improve the output air volume of the centrifugal fan using the blade, and the like, so it is difficult to improve the wind driving performance of the centrifugal fan. Therefore, how to design and optimize a blade to improve the wind driving performance of the centrifugal fan is a difficult problem plaguing the industry. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a fan wheel and a centrifugal fan for improving the performance of the heat dissipation fan.

[0005] The technical scheme provided by the application to solve the technical problem is as follows:

[0006] A fan wheel comprises a hub and a plurality of blades formed by extending outward from the outer periphery of the hub:

[0007] Each of the blades comprises a first section, a second section and a third section, the first section is connected to the hub, the second section is located between the first section and the third section, and the second section connects the first section and the third section.

[0008] Wherein, along the outer periphery of the hub, the first section is curved to extend as an arc section, and the third section is curved to extend as an arc section.

[0009] The bending directions of the first section and the third section are opposite.

[0010] The circle where the first section is located does not overlap with the second section.

[0011] The circle where the third section is located does not overlap with the second section.

[0012] Further, the wind inlet angle a of the blade is not greater than 90 degrees.

[0013] The wind inlet angle a of the blade is the included angle between the direction of the tangent line of the inner end of the first section pointing to the outside of the fan wheel and the opposite direction of the linear velocity direction of the inner end of the first section when the fan wheel rotates.

[0014] Further, on any one of the blades, along a rotation direction of the fan wheel, the inner end portion A of the first blade section is located in front of the outer end portion C of the second blade section.

[0015] Further, on any one of the blades, along a rotation direction of the fan wheel, the outer end portion C of the second blade section is located in front of the outer end portion D of the third blade section.

[0016] Further, a maximum outer diameter of the fan wheel is defined as OD;

[0017] A maximum outer diameter of a hub of the fan wheel is defined as D0;

[0018] A maximum outer diameter of the fan wheel at the outer end portion of the first blade section is defined as D1;

[0019] A maximum outer diameter of the fan wheel at the outer end portion of the second blade section is defined as D2;

[0020] D1≧OD*50% is satisfied;

[0021] OD*60%≦D2≦OD*90% is satisfied;

[0022] D0<OD*50% is satisfied.

[0023] Further, an air outlet angle β of the blade is not less than 75 degrees and not more than 125 degrees;

[0024] The air outlet angle β of the blade is an included angle between a direction of a tangent line at the outer end portion of the third blade section pointing to an outside of the fan wheel and a direction of a linear velocity of the outer end portion of the third blade section when the fan wheel rotates.

[0025] Further, the second blade section is a straight plate shape outward of the outer periphery of the hub;

[0026] A tangent line at the outer end portion of the first blade section overlaps the second blade section;

[0027] A tangent line at the inner end portion of the third blade section overlaps the second blade section.

[0028] Further, the second blade section is curved to extend as an arc section outward of the outer periphery of the hub;

[0029] A tangent line at the outer end portion of the first blade section overlaps a tangent line at the inner end portion of the second blade section;

[0030] A tangent line at the outer end portion of the second blade section overlaps a tangent line at the inner end portion of the third blade section;

[0031] A bending radius of the second blade section is not equal to a bending radius of the first blade section;

[0032] The bending radius of the second section of the blade is not equal to the bending radius of the third section of the blade.

[0033] Further, the bending radius of the second section of the blade is greater than the bending radius of the first section of the blade.

[0034] The bending radius of the second section of the blade is greater than the bending radius of the third section of the blade.

[0035] Further, the bending radius of the first section of the blade is not equal to the bending radius of the third section of the blade.

[0036] Further, the bending radius of the first section of the blade is less than the bending radius of the third section of the blade.

[0037] Further, the second section of the blade extends outward along the outer periphery of the hub as a camber line.

[0038] Further, the thickness of the first section of the blade, the second section of the blade and the third section of the blade is the same.

[0039] Further, a mute ring is further included, and the mute ring integrally connects the third sections of the blades.

[0040] Further, at least half of the extension length of the second section of the blade is exposed upward along the up-down direction to the air inlet outside along the outer periphery of the hub.

[0041] At least half of the extension length of the third section of the blade is not exposed upward along the up-down direction to the air inlet outside along the outer periphery of the hub.

[0042] The application further discloses the following technical solutions.

[0043] A centrifugal fan comprises the fan wheel according to any one of the above technical solutions, and further comprises:

[0044] A shell is formed with a hollow cavity and formed with an air inlet and an air outlet which are in communication with the outside world;

[0045] The fan wheel is assembled in the cavity of the shell and located directly below the air inlet;

[0046] A stator assembly is installed in the cavity of the shell and forms a magnetic induction gap with the fan wheel;

[0047] An air flow channel is formed between the outer periphery of the fan wheel and the inner wall surface of the cavity of the shell.

[0048] The application has the following beneficial effects: a three-section blade fan wheel is designed, the fan wheel driving performance is improved, and the overall performance of the centrifugal fan is improved. BRIEF DESCRIPTION OF DRAWINGS

[0049] The application will be further described below in conjunction with the drawings and embodiments.

[0050] Figure 1 is a perspective view of the centrifugal fan of the present application.

[0051] Figure 2 is a top view of the centrifugal fan of the present application.

[0052] Figure 3 is Figure 1 is a partial exploded view of the centrifugal fan of the present application, specifically showing a perspective view of the upper cover plate separated.

[0053] Figure 4 is a top view of the centrifugal fan of the present application, mainly showing the positional relationship between the fan wheel and the air inlet on the upper cover plate.

[0054] Figure 5 is Figure 4 is an enlarged view of the structure within the dashed box.

[0055] Figure 6 is a top view of the first embodiment of the fan wheel of the present application.

[0056] Figure 7 is Figure 6 is an enlarged view of the structure within the dashed box.

[0057] Figure 8 is a top view of the second embodiment of the fan wheel of the present application.

[0058] Figure 9 is Figure 8 is an enlarged view of the structure within the dashed box.

[0059] Figure 10 is a comparison chart of the P / Q performance curves of the centrifugal fan of the present application using the fan wheel of the first embodiment and the centrifugal fan of the conventional centrifugal fan using a two-segment S-shaped blade. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0061] Please refer to Figures 1 to 7As shown, it is a first embodiment of a fan wheel and a cooling fan assembled with the fan wheel. Specifically, the cooling fan includes a housing 30, a fan wheel (not numbered) and a stator assembly (not shown) mounted in the housing 30. Wherein the housing 30 is formed with a hollow cavity 31 and formed with an air inlet 301 and an air outlet 302 for communicating the cavity 31 with the outside. The fan wheel is rotatably assembled in the cavity 31 of the housing 30 and located directly below the air inlet 301. The fan wheel includes a hub 10 and a plurality of blades 20, the plurality of blades 20 are formed by the outer periphery of the hub 10 and extend outwardly and are arranged along the circumference of the hub 10. The stator assembly is mounted in the cavity 31 of the housing 30, and in a specific embodiment, the stator assembly is located directly below the hub 10. The stator assembly and the fan wheel form a magnetic gap therebetween. The outer periphery of the fan wheel and the inner wall surface of the cavity 31 of the housing 30 form an air flow channel 303. The cooling fan of the present application is preferably a centrifugal cooling fan. In use, the stator assembly is powered to generate a magnetic field and magnetically coupled with the fan wheel to drive the fan wheel to rotate. The fan wheel drives air to be sucked in through the air inlet 301 and accelerated in the air flow channel 303 after being centrifuged through the air passage (not numbered) formed between adjacent blades 20, and finally blown out through the air outlet 302, to achieve the function of driving wind and dissipating heat.

[0062] The centrifugal fan of the present application can be used in an electronic device, including but not limited to a mobile phone, a tablet computer (PAD), a notebook computer, a personal digital assistant (PDA), a server, a switch, a computing device, a vehicle-mounted device, a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc.

[0063] Please refer to Figures 3 to 7As shown, in the present application, each of the blades 20 comprises a first blade section 21, a second blade section 22 and a third blade section 23. The first blade section 21 is connected to the hub 10, the second blade section 22 is located between the first blade section 21 and the third blade section 23, and the second blade section 22 connects the first blade section 21 and the third blade section 23. Preferably, a silencer ring 40 is further provided, and the silencer ring 40 integrally connects a plurality of the third blade sections 23.

[0064] Each of the blades 20 is formed with an inlet angle a and an outlet angle β. Specifically, the inlet angle a of the blade 20 is the included angle between the direction along the tangent of the inner end portion of the first blade section 21 pointing to the outside of the fan wheel and the opposite direction of the linear velocity direction of the inner end portion of the first blade section 21 when the fan wheel rotates. The outlet angle β of the blade 20 is the included angle between the direction along the tangent of the outer end portion of the third blade section 23 pointing to the outside of the fan wheel and the opposite direction of the linear velocity direction of the outer end portion of the third blade section 23 when the fan wheel rotates. In a preferred embodiment, the inlet angle a of the blade 20 is not greater than 90 degrees. In a preferred embodiment, the outlet angle β of the blade 20 is not less than 75 degrees and not greater than 125 degrees (which can include but is not limited to 75 degrees, 76 degrees, 77 degrees,..., 123 degrees, 124 degrees, 125 degrees, etc.).

[0065] For reference, please refer to Figures 5 to 7 As shown, in the present application, preferably, the first blade section 21 extends outward along the outer periphery of the hub 10 as an arc section. The third blade section 23 extends outward along the outer periphery of the hub 10 as an arc section. The second blade section 22 is a straight plate. Preferably, the bending radius of the first blade section 21 is smaller than the bending radius of the third blade section 23. The bending directions of the first blade section 21 and the third blade section 23 are opposite. The tangent of the outer end portion B of the first blade section 21 overlaps the second blade section 22. The tangent of the inner end portion (i.e. the outer end portion B of the first blade section 21) of the third blade section 23 overlaps the second blade section 22. Preferably, along the rotation direction of the fan wheel, the inner end portion A of the first blade section 21 is located in front of the outer end portion C of the second blade section 22. Preferably, along the rotation direction of the fan wheel, the outer end portion C of the second blade section 22 is located in front of the outer end portion D of the third blade section 23.

[0066] In addition, it should be noted that, in the present application, preferably, the thicknesses of the first blade section 21, the second blade section 22 and the third blade section 23 are the same. In addition, preferably: along the outer periphery of the hub 10, at least half of the extension length of the second blade section 22 in the radial direction of the fan wheel is exposed upward to the outside of the air inlet 301 in the up-down direction. At least half of the extension length of the third blade section 23 in the radial direction of the fan wheel is not exposed upward to the outside of the air inlet 301 in the up-down direction.

[0067] By means of, for example, the drawingsFigures 1 to 7 In the first embodiment of the fan wheel of the present application, the blade 20 is designed in a backward-swept structure (understood as the blade 20 extends outward from the inner end A and is located entirely behind the position of the inner end A of the fan wheel along the rotation direction of the fan wheel), and forms a three-section structure formed by the first section blade 21, the second section blade 22 and the third section blade 23. The blade 20 can have a larger wind driving area, and during the entire driving process of the wind, the blade 20 can have a smaller wind resistance at one end close to the rotating shaft of the hub, and is not easy to form vortex, so that the air flow between the adjacent two blades 20 is relatively smooth, the noise and the flow loss of the air during the rotation of the fan wheel are reduced, which is beneficial to increase the air volume, reduce the noise and improve the static pressure during the operation of the centrifugal fan, and further improve the overall performance of the cooling fan.

[0068] Further, in the preferred embodiment, the inlet angle a of the blade 20 is not greater than 65 degrees and not less than 25 degrees (which can include but is not limited to 25 degrees, 26 degrees, 27 degrees, 28 degrees, 29 degrees, 64 degrees, 65 degrees, etc.). In this way, the layout density of the blade 20 at the outer peripheral position of the hub 10 can be improved, while the effective width of the flow channel of the adjacent two blades 20 at the position of the first section blade 21 can be ensured. In other words, a better balance between the layout density of the blade 20 and the effective width of the flow channel of the adjacent two blades 20 at the position of the first section blade 21 can be achieved. This is helpful to improve the wind inlet effect and reduce the noise of the fan wheel at the position of the first section blade 21.

[0069] Further, in the embodiment of the present application, by setting the second section blade 22 (in some examples: compared with the first section blade 21 and the third section blade 23, the second section blade 22 has the smallest bending degree and the largest inclination degree (compared with the radial direction of the corresponding position)), the blade 20 has a longer centrifugal acceleration distance for the air sucked in at the position of the second section blade 22, has a better centrifugal acceleration effect, and has a positive effect on the improvement of the air volume and the static pressure value. At the same time, the relatively gentle second section blade 22 is also beneficial to reduce the wind resistance and is not easy to form vortex, which also has a positive effect on noise reduction.

[0070] Further, in the embodiment of the present application, by setting the third section blade 23, the air accelerated by the second section blade 22 can be guided, so that the air tends to blow along the diameter direction of the fan wheel, and the air driven by the fan wheel has good aggregation (strong consistency) when flowing out of the air outlet 302, thereby improving the overall performance of the centrifugal fan.

[0071] In the preferred embodiment, the maximum outer diameter of the fan wheel is defined as OD. The maximum outer diameter of the hub 10 of the fan wheel is defined as D0. The maximum outer diameter of the fan wheel at the outer end of the first section of blades 21 is defined as D1. The maximum outer diameter of the fan wheel at the outer end of the second section of blades 22 is defined as D2. Preferably, D1>OD*50% is satisfied. OD*60%<D2<OD*90% is satisfied. D0<OD*50% is satisfied. By optimizing the length proportions of the sections of blades 20 (the first section of blades 21, the second section of blades 22, and the third section of blades 23), the air volume and static pressure value can be further improved, and the noise can be effectively reduced.

[0072] The following is a comparison of the performance (P / Q characteristic curve trend chart) of a centrifugal fan using the fan wheel designed in the present application and a centrifugal fan using an old fan wheel measured by samples. The old fan wheel uses an S-shaped two-section blade structure (as shown in the prior art CN216407281U patent). The P-Q characteristic curve trend chart is measured under the same test conditions. The abscissa Q represents the air volume (unit: CFM), and the ordinate P represents the static pressure value (unit: mm-Aq). It can be seen that the air volume and static pressure of the fan wheel in the present application are significantly improved compared with the old fan wheel. In addition, under the same noise requirement conditions, the speed of the fan wheel designed in the present application is also significantly improved compared with the old fan wheel (not shown in the figure). It can be seen that the overall performance of the fan wheel with the three-section blade 20 designed in the present application is better than that of the traditional old fan wheel.

[0073] Please refer to Figure 8 and Figure 9 for the second embodiment of the fan wheel disclosed in the present application, which is different from the first embodiment shown in Figures 1 to 7 only in the structure of the second section of blades 22. In the second embodiment, the second section of blades 22 is curved to extend as an arc section, the tangent line at the outer end B of the first section of blades 21 overlaps the tangent line at the inner end (which is actually the outer end B of the first section of blades 21) of the second section of blades 22. The tangent line at the outer end C of the second section of blades 22 overlaps the tangent line at the inner end (which is actually the outer end C of the second section of blades 22) of the third section of blades 23. Preferably, the curvature radius of the second section of blades 22 is not equal to the curvature radius of the first section of blades 21, and the curvature radius of the second section of blades 22 is not equal to the curvature radius of the third section of blades 23. Preferably, the curvature radius of the second section of blades 21 is greater than the curvature radius of the first section of blades 21, and the curvature radius of the second section of blades 21 is greater than the curvature radius of the third section of blades 23.

[0074] In addition, the fan wheel disclosed in the present application can also have a third embodiment (not shown), which is different from the first embodiment shown in Figures 1 to 7The difference between the first embodiment shown in the middle is only the structure of the second segment blade 22, in the third embodiment, the second segment blade 22 is curved to extend into a clothoid line, which needs to meet:

[0075] The tangent line of the first segment blade 21 at the outer end B overlaps the tangent line of the second segment blade 22 at the inner end (which is actually the outer end B of the first segment blade 21);

[0076] The tangent line of the second segment blade 22 at the outer end C overlaps the tangent line of the third segment blade 23 at the inner end (which is actually the outer end C of the second segment blade 22);

[0077] The second segment blade 22 is curved into a continuously curved curve with varying curvature from the inner end to the outer end C.

[0078] Among them, the fan wheels of the above-mentioned second and third embodiments disclosed in the present application are also sample tested, and the conclusion is similar to the first embodiment. Compared with the above-mentioned old fan wheel, the performance of the above-mentioned three embodiments of the present application is improved.

[0079] It is obvious to those skilled in the art that the present application is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0080] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A fan wheel comprising a hub (10) and a plurality of blades (20) extending outward from the outer periphery of the hub (10), characterized in that: Each blade (20) includes a first blade section (21), a second blade section (22), and a third blade section (23); the first blade section (21) is connected to the hub (10); the second blade section (22) is located between the first blade section (21) and the third blade section (23); and the second blade section (22) connects the first blade section (21) and the third blade section (23); Wherein, along the outer periphery of the hub (10) outward, the first segment leaf (21) bends and extends into a circular arc segment, and the third segment leaf (23) bends and extends into a circular arc segment; The bending directions of the first leaf segment (21) and the third leaf segment (23) are opposite; The circle where the first segment of the leaf (21) is located does not overlap with the circle where the second segment of the leaf (22) is located; The circle where the third leaf segment (23) is located does not overlap with the circle where the second leaf segment (22) is located.

2. The impeller according to claim 1, characterized in that: The wind inlet angle α of the blade (20) is not greater than 90 degrees; The wind entry angle α of the blade (20) is the angle between the direction of the tangent line along the inner end of the first blade (21) pointing to the outer side of the fan wheel and the direction opposite to the linear velocity direction of the inner end of the first blade (21) when the fan wheel rotates.

3. The impeller according to claim 1, characterized in that: On any one of the blades (20), along the rotation direction of the impeller, the inner end A of the first segment blade (21) is located in front of the outer end C of the second segment blade (22).

4. The impeller according to claim 3, characterized in that: On any one of the blades (20), along the rotation direction of the impeller, the outer end C of the second segment blade (22) is located in front of the outer end D of the third segment blade (23).

5. The impeller according to claim 1, characterized in that: The maximum outer diameter of the impeller is defined as OD; The maximum outer diameter of the hub (10) of the fan wheel is defined as D0; The maximum outer diameter of the impeller at the outer end of the first blade (21) is defined as D1; The maximum outer diameter of the impeller at the outer end of the second blade (22) is defined as D2; Satisfy: D1 ≧ OD * 50%; Meet: OD*60%≦D2≦OD*90%; Satisfied: D0 <OD*50%。 6. The impeller according to claim 1, characterized in that: The wind outlet angle β of the blade (20) is not less than 75 degrees and not more than 125 degrees; The outlet angle β of the blade (20) is the angle between the direction of the tangent line along the outer end of the third blade (23) pointing to the outer side of the fan wheel and the direction opposite to the linear velocity direction of the outer end of the third blade (23) when the fan wheel rotates.

7. The impeller according to any one of claims 1 to 6, characterized in that: Outwardly along the outer periphery of the hub (10), the second blade (22) is in a straight plate shape; The tangent line of the first leaf segment (21) at the outer end portion overlaps with the second leaf segment (22); The tangent line of the third leaf segment (23) at the inner end portion overlaps with the second leaf segment (22).

8. The impeller according to any one of claims 1 to 6, characterized in that: Along the outer periphery of the hub (10) outward, the second blade (22) bends and extends into a circular arc segment; The tangent line of the first segment leaf (21) at the outer end portion overlaps with the tangent line of the second segment leaf (22) at the inner end portion; The tangent line of the second segment leaf (22) at the outer end portion overlaps with the tangent line of the third segment leaf (23) at the inner end portion; The bending radius of the second leaf segment (22) is not equal to the bending radius of the first leaf segment (21); The bending radius of the second leaf segment (22) is not equal to the bending radius of the third leaf segment (23).

9. The impeller according to claim 8, characterized in that: The bending radius of the second leaf segment (22) is greater than the bending radius of the first leaf segment (21); The bending radius of the second segment leaf (22) is greater than the bending radius of the third segment leaf (23).

10. The impeller according to claim 1, characterized in that: The bending radius of the first leaf segment (21) is not equal to the bending radius of the third leaf segment (23).

11. The impeller according to claim 10, characterized in that: The bending radius of the first segment leaf (21) is smaller than the bending radius of the third segment leaf (23).

12. The impeller according to claim 10 or 11, characterized in that: Along the outer periphery of the hub (10) outward, the second blade (22) bends and extends into a cloud gauge line.

13. The impeller according to any one of claims 1 to 6, characterized in that: The first leaf section (21), the second leaf section (22) and the third leaf section (23) have the same thickness.

14. The impeller according to any one of claims 1 to 6, characterized in that: Also includes: A silent ring (40) integrally connects a plurality of the third segment leaves (23).

15. The impeller according to any one of claims 1 to 6, characterized in that: Outwardly along the outer periphery of the hub (10), at least half of the extension length of the second blade (22) is exposed upwardly and outwardly of the air inlet (301); Outwardly along the outer periphery of the hub (10), at least half of the extended length of the third blade (23) is not exposed upwardly to the outside of the air inlet (301) in the vertical direction.

16. A centrifugal fan comprising the impeller according to any one of claims 1 to 15, characterized in that: Also includes: The housing (30) is formed with a hollow cavity (31) and an air inlet (301) and an air outlet (302) for connecting the cavity (31) with the outside; The impeller is rotatably assembled in the cavity (31) of the housing (30) and is located directly below the air inlet (301); A stator assembly is installed in the cavity (31) of the housing (30) and forms a magnetic induction gap with the impeller; An air flow channel (303) is formed between the outer periphery of the impeller and the inner wall surface of the cavity (31) of the housing (30).

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