Improved fan blade assembly and cooling fan

Abstract

The utility model discloses an improved fan blade assembly and a cooling fan. The improved fan blade assembly comprises a hub, a fan blade and a fan blade, the main fan blades are formed by extending the periphery of the hub outwards, and a flow channel is formed between every two adjacent main fan blades; the auxiliary fan blades are arranged in the flow channels, extend along the corresponding flow channels and divide the corresponding flow channels into at least two flow channel branches at intervals, each auxiliary fan blade is provided with an inner end part close to the hub and an outer end part far away from the hub, and the inner end parts are not connected with the hub; the maximum outer diameter A is defined for the fan blade assembly, the minimum inner diameter B is defined between the inner ends of the auxiliary fan blades, and B / A is larger than or equal to 0.5 and smaller than or equal to 0.8; the first structure stabilizing part C1 and the second structure stabilizing part C2 are connected with the auxiliary fan blades and the main fan blades adjacent to the auxiliary fan blades in the circumferential direction of the hub respectively; wherein the first structure stabilizing part C1 and the second structure stabilizing part C2 are mutually independent and are arranged in a staggered manner in the radial direction of the hub.

Description

Technical Field

[0001] The present application relates to an improved fan blade assembly and a cooling fan. Background Art

[0002] A fan is a device that uses an electric motor to drive the rotation of blades, thereby accelerating air circulation. It can be used for heat dissipation in homes, offices, and electronic components. For example, a fan is used for heat dissipation of a laptop computer to prevent the electronic components inside the laptop from being damaged due to overheating. Currently, the commonly used cooling fans mainly include a fan frame module, a stator module implanted in the fan frame module, and a rotor module rotatably engaged with the stator module. Among them, the rotor module is integrated with a fan blade structure for realizing the function of driving air.

[0003] For related prior art, please refer to the Chinese invention patent application publication CN111795013A. This patent discloses a silent fan assembly, which includes a base 1, a plurality of blades 2 evenly spaced along the circumference of the base 1, a silent ring 3 circumferentially penetrating each blade 2, and a connecting member 4 for fixing the blade 3 and the base 1 integrally. The noise reduction of the high-speed rotating blades of the fan assembly is realized through the silent ring 3 structure.

[0004] However, it is found in actual research and development that even with the addition of the silent ring 3, its noise still needs to be improved. In addition, in such fan assemblies in the prior art, since all the blades are radially arranged at intervals outward from the circumference of the base 1, the width of the flow channel between two adjacent blades will be narrow at the end close to the base 1 and wide at the end far from the base 1. In this way, a turbulent flow phenomenon will occur on the surface of the adjacent blades at the end far from the base 1, thereby increasing the generation of noise and also affecting the air volume. Moreover, with different total numbers of blades and different overall lengths of the blades, the width difference at both ends of the above-mentioned flow channel will also be different, making it difficult to control the noise. In addition, it will also affect the effective air volume ejected from the air outlet.

[0005] For another prior art, please refer to the Chinese invention patent publication CN115653935A. This patent improves the above technical problems by adding auxiliary fan blades between two adjacent main fan blades. However, it is found in actual products that since the auxiliary fan blades are not directly connected to the hub, the auxiliary fan blades are only integrally connected to the main fan blades through a connecting ring. When such a fan blade assembly rotates, the auxiliary fan blades will show a shaking vibration phenomenon and a turbulent flow problem, which will increase the noise and affect the air driving efficiency of the fan blade assembly to a certain extent.

[0006] Therefore, it is necessary to propose a new design to solve the above technical problems. Summary of the Utility Model

[0007] The purpose of the present application is to provide an improved fan blade assembly and a cooling fan for improving noise and enhancing air driving efficiency.

[0008] To achieve the above object, the present application adopts the following technical solutions:

[0009] An improved fan blade assembly, comprising: a hub;

[0010] A plurality of main fan blades extending outward from the outer periphery of the hub, each main fan blade having an air inlet end and an air outlet end, the air inlet end being connected to the hub and the air outlet end being away from the hub, and a flow channel being formed between two adjacent main fan blades;

[0011] A plurality of auxiliary fan blades disposed in the flow channel and extending along the corresponding flow channel, and dividing the corresponding flow channel into at least two flow channel branches at intervals, each auxiliary fan blade having an inner end portion close to the hub and an outer end portion away from the hub, and the inner end portion not being connected to the hub;

[0012] The fan blade assembly is defined with a maximum outer diameter A, and a minimum inner diameter B is defined between the inner end portions of the plurality of auxiliary fan blades, and 0.8 ≧ B / A ≧ 0.5 is satisfied;

[0013] A first structural stability portion C1 connecting the auxiliary fan blade and the main fan blade adjacent to the auxiliary fan blade in the circumferential direction of the hub;

[0014] A second structural stability portion C2 connecting the auxiliary fan blade and the main fan blade adjacent to the auxiliary fan blade in the circumferential direction of the hub; wherein

[0015] The first structural stability portion C1 and the second structural stability portion C2 are independent of each other and are arranged in a dislocation manner in the radial direction of the hub.

[0016] To achieve the above object, the present application also adopts the following technical solutions:

[0017] An improved fan blade assembly, comprising:

[0018] A hub;

[0019] A plurality of main fan blades extending outward from the outer periphery of the hub, each main fan blade having an air inlet end and an air outlet end, the air inlet end being connected to the hub and the air outlet end being away from the hub, and a flow channel being formed between two adjacent main fan blades;

[0020] A plurality of auxiliary fan blades disposed in the flow channel and extending along the corresponding flow channel, and dividing the corresponding flow channel into at least two flow channel branches at intervals, each auxiliary fan blade having an inner end portion close to the hub and an outer end portion away from the hub, and the inner end portion not being connected to the hub;

[0021] A first structural stability portion C1 connecting the auxiliary fan blade and the main fan blade adjacent to the auxiliary fan blade in the circumferential direction of the hub;

[0022] The second structural stabilizing part C2 is connected to the auxiliary fan blade and the main fan blade that is circumferentially adjacent to the auxiliary fan blade along the hub; wherein

[0023] The first structural stabilizing part C1 and the second structural stabilizing part C2 are independent of each other and are arranged offset in the radial direction of the hub;

[0024] The inclined part is formed at one end of the auxiliary fan blade close to the hub axis in the radial direction of the hub.

[0025] Furthermore, one of the first structural stabilizing part C1 and the second structural stabilizing part C2 connected to the same auxiliary fan blade is located at the end of the auxiliary fan blade far from the hub, and the other is located at the end of the auxiliary fan blade close to the hub.

[0026] Furthermore, one of the first structural stabilizing part C1 and the second structural stabilizing part C2 connected to the same auxiliary fan blade is located at the upper edge position of the corresponding auxiliary fan blade in the axial direction of the hub, and the other is located at the lower edge position of the corresponding auxiliary fan blade in the axial direction of the hub.

[0027] Furthermore, the first structural stabilizing part C1 is a closed ring structure coaxial with the hub;

[0028] And / or, the second structural stabilizing part C2 is a closed ring structure coaxial with the hub.

[0029] Furthermore, there are multiple first structural stabilizing parts C1, and each first structural stabilizing part C1 is only connected to one auxiliary fan blade and one main fan blade adjacent to the auxiliary fan blade;

[0030] And / or, there are multiple second structural stabilizing parts C2, and each second structural stabilizing part C2 is only connected to one auxiliary fan blade and one main fan blade adjacent to the auxiliary fan blade.

[0031] Furthermore, there are multiple first structural stabilizing parts C1, and each first structural stabilizing part C1 is connected to at least three or more of the total of multiple auxiliary fan blades and multiple main fan blades;

[0032] And / or, there are multiple second structural stabilizing parts C2, and each second structural stabilizing part C2 is connected to at least three or more of the total of multiple auxiliary fan blades and multiple main fan blades.

[0033] Furthermore, the inclined part is formed at one end of the auxiliary fan blade close to the hub axis in the radial direction of the hub; the inner end of the auxiliary fan blade forms an inclined part, and an angle β is formed between the inclined part and the axial direction of the hub, and the angle β is greater than 0 degree and not greater than 75 degrees.

[0034] Furthermore, the angle β is greater than 0 degree and not greater than 75 degrees.

[0035] Further, the included angle β is greater than 0 degrees and not greater than 45 degrees.

[0036] Further, one end of the auxiliary fan blade along the axial direction of the hub is defined as the narrow edge part, and the other end is defined as the wide edge part;

[0037] The width of the auxiliary fan blade along the radial direction of the hub gradually increases from the narrow edge part to the wide edge part;

[0038] One of the first structural stability part C1 and the second structural stability part C2 is arranged at one end position of the wide edge part close to the hub along the radial direction of the hub.

[0039] Further, the other of the first structural stability part C1 and the second structural stability part C2 is arranged at one end position of the wide edge part far from the hub along the radial direction of the hub;

[0040] Alternatively, the other of the first structural stability part C1 and the second structural stability part C2 is arranged at one end position of the narrow edge part far from the hub along the radial direction of the hub.

[0041] Further, one auxiliary fan blade is arranged between any two adjacent main fan blades;

[0042] Alternatively, two auxiliary fan blades are arranged between any two adjacent main fan blades;

[0043] Each auxiliary fan blade forms a windward surface and a leeward surface, and the thickness of each auxiliary fan blade along the direction perpendicular to the windward surface and / or the leeward surface is equal from the inner end to the outer end;

[0044] Each main fan blade forms a windward surface and a leeward surface, and the thickness of each main fan blade along the direction perpendicular to the windward surface and / or the leeward surface is equal from the air inlet end to the air outlet end;

[0045] The thickness of any auxiliary fan blade along the direction perpendicular to the windward surface and / or the leeward surface is equal to the thickness of any main fan blade along the direction perpendicular to the windward surface and / or the leeward surface.

[0046] Further, the flow channel forms a minimum width W1 of the main blade flow channel at one end close to the hub, and the flow channel branch forms a minimum width W2 of the auxiliary blade flow channel at one end close to the hub, and W1≥W2.

[0047] To achieve the above object, the present application also adopts the following technical solutions:

[0048] A heat dissipation fan includes the fan blade assembly as described in any one of the above, and further includes:

[0049] A fan frame assembly, which forms an air inlet penetrating along the axial direction of the hub and an air outlet penetrating along the radial direction of the hub;

[0050] A stator assembly, integrated within the fan frame assembly;

[0051] A rotating shaft assembly and a magnetic element are integrated on the hub of the fan blade assembly. The fan blade assembly is rotationally coupled within the fan frame through the rotating shaft assembly, and an electromagnetic coupling is formed between the magnetic element and the stator assembly.

[0052] Further, the inner ends of the auxiliary fan blades extend radially along the hub to directly below the air inlet, and the inner ends are exposed from the air inlet along the axial direction of the hub;

[0053] One of the first structural stability portion C1 and the second structural stability portion C2 is located directly below the air inlet position of the fan frame and is exposed from the air inlet along the axial direction of the hub;

[0054] The other of the first structural stability portion C1 and the second structural stability portion C2 is not exposed from the air inlet along the axial direction of the hub.

[0055] Further, the fan blade assembly defines a maximum outer diameter A, and the inner ends of multiple auxiliary fan blades define a minimum inner diameter B, and 0.8 ≧ B / A ≧ 0.7 is satisfied.

[0056] Further, the total number of the main fan blades is greater than or equal to 28 and less than or equal to 75.

[0057] Further, the total number of the main fan blades is greater than or equal to 28 and less than or equal to 68.

[0058] Compared with the prior art, the present application has the following beneficial effects: It can improve noise and enhance the air driving efficiency. Description of the Drawings

[0059] Figure 1 is a three-dimensional schematic diagram of the cooling fan of the present application.

[0060] Figure 2 is a top view of the cooling fan of the present application.

[0061] Figure 3 is Figure 2 a cross-sectional view taken along line A-A in

[0062] Figure 4 is a top view of the first embodiment of the fan blade assembly of the cooling fan of the present application.

[0063] Figure 5 is Figure 4 an enlarged view of the structure within the dashed box in

[0064] Figure 6 is a top view of the second embodiment of the fan blade assembly of the cooling fan of the present application.

[0065] Figure 7 It is a top view of the third embodiment of the fan blade assembly of the cooling fan of the present application.

[0066] Figure 8 It is a top view of the fourth embodiment of the fan blade assembly of the cooling fan of the present application.

[0067] Figure 9 It is a flattened schematic diagram of the fan blade of the first embodiment of the fan blade assembly of the cooling fan of the present application, where the inclined parabolic line area refers to the auxiliary fan blade area.

[0068] Figure 10 It is Figure 9 Another variant embodiment, where the inclined parabolic line area refers to the auxiliary fan blade area.

[0069] Figure 11 It is Figure 9 Another variant embodiment, where the inclined parabolic line area refers to the auxiliary fan blade area. Detailed implementation manners

[0070] In order to make the objectives, technical solutions and advantages of the present application clearer, the following will further elaborate on the present application in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0071] Please refer to Figures 1 to 5 and Figure 9 As shown, it is the first embodiment of a cooling fan disclosed in the present application. The cooling fan includes a fan frame assembly 21, a stator assembly (not shown) integrated in the fan frame assembly 21, and a fan blade assembly 10 rotatably coupled in the fan frame assembly 21. The cooling fan of the present application is a centrifugal fan. Among them, the fan frame assembly 21 is formed with an air inlet 211 axially penetrating along the hub 1 (described below) and an air outlet 212 radially penetrating along the hub 1. After the stator assembly is powered on, electromagnetic coupling can be generated between it and the fan blade assembly 10, and the fan blade assembly 10 is driven to rotate. After the fan blade assembly 10 rotates, air is driven to be inhaled from the air inlet 211 and blown out from the air outlet 212 to achieve the basic function of the cooling fan.

[0072] Please refer to Figures 1 to 5As shown, the fan blade assembly 10 includes a hub 1, a plurality of main fan blades 11 radially extending outward from the outer periphery of the hub 1, a plurality of auxiliary fan blades 12, and a first structural stability portion C1 and a second structural stability portion C2 for connecting and fixing the plurality of auxiliary fan blades 12 to the plurality of main fan blades 11. The fan blade assembly 10 further includes a rotating shaft assembly (not shown, such as a cylindrical rotating shaft) coupled to the axial center position inside the hub 1, and a magnetic element (not shown). The fan blade assembly 10 is rotationally coupled to the fan frame 21 through the rotating shaft assembly, and an electromagnetic coupling is formed between the magnetic element and the stator assembly.

[0073] In a preferred embodiment of the present application, one of the auxiliary fan blades 12 is disposed between any two adjacent main fan blades 11 (in other modified embodiments, two auxiliary fan blades 12 can also be provided). Each of the main fan blades 11 has an air inlet end 111 and an air outlet end 112. The air inlet end 111 is connected to the hub 1, and the air outlet end 112 is away from the hub 1. A flow channel 101 is formed between two adjacent main fan blades 11. The auxiliary fan blade 12 is located in the flow channel 101 and extends along the corresponding flow channel 101, and divides the corresponding flow channel 101 into two flow channel branches 102 at intervals. Each of the auxiliary fan blades 12 has an inner end portion 121 near the hub 1 and an outer end portion 122 away from the hub 1. Along the extending direction of the flow channel 101, the extending length of the auxiliary fan blade 12 is shorter than that of the main fan blade 11, and the auxiliary fan blade 12 is located at the air outlet end 112 position of the main fan blade 11.

[0074] In a preferred embodiment of the present application, the inner end portions 121 of the plurality of auxiliary fan blades 12 are on the same circumference. The outer end portions 122 of the plurality of auxiliary fan blades 12 and the air outlet ends 112 of the plurality of main fan blades 11 are on the same circumference and are concentric with the circle where the inner end portions 121 of the plurality of auxiliary fan blades 12 are located.

[0075] Through the auxiliary fan blade 12, the width difference of each flow channel 101 at the air inlet end 111 and the air outlet end 112 can be improved, and the width difference between the air inlet end 111 and the air outlet end 112 of the flow channel 101 of the main fan blade 11 can be reduced. Furthermore, the turbulent flow phenomenon of the air flow in the flow channel 101 can be improved, thereby improving the noise, increasing the air volume and the static pressure value. In addition, the addition of the auxiliary fan blades 12 does not cause the position of the main fan blades 11 at the air inlet end 111 to be too dense and affect the air intake volume, nor does it reduce the effective air intake area of the air inlet.

[0076] In a preferred embodiment of the present application, the inner end portion 121 of each of the auxiliary fan blades 12 extends along the radial direction of the hub 1 to directly below the air inlet 211, and the inner end portion 121 is exposed from the air inlet 211 along the axial direction of the hub 1, so that the starting end of the flow channel branch 102 is located at the edge G of the air inlet 211 ( Figure 2at the inner position (as shown), avoiding directly setting the starting end of the flow channel branch 102 directly below the edge G of the air inlet 211. In this way, it can improve the excessive air flow disturbance and generate noise between the air flow entering the flow channel 101 at the edge G position of the air inlet 211 (especially at the starting end position of the flow channel branch 102) and the air flow after the initial diversion by the auxiliary fan blades 12 in the original flow channel 101, and make the air flow after the initial diversion by the auxiliary fan blades 12 in the original flow channel 101 form a preliminary transition and stability.

[0077] Please refer to Figure 3 and Figure 4 As shown, in the embodiment of the present application, the first structural stability portion C1 is a closed circular ring structure coaxial with the hub 1; the second structural stability portion C2 is a closed circular ring structure coaxial with the hub 1. The first structural stability portion C1 integrally connects the plurality of auxiliary fan blades 12 and the plurality of main fan blades 11, and the second structural stability portion C2 integrally connects the plurality of auxiliary fan blades 12 and the plurality of main fan blades 11. Specifically, in a preferred embodiment, the first structural stability portion C1 is connected to the upper edges of the corresponding main fan blades 11 and auxiliary fan blades 12 in the axial direction of the hub 1 and is located at one end away from the hub axis 1 in the radial direction of the hub 1, and the second structural stability portion C2 is connected to the lower edges of the corresponding main fan blades 11 and auxiliary fan blades 12 in the axial direction of the hub 1 and is located at one end close to the hub axis 1 in the radial direction of the hub 1. The first structural stability portion C1 and the second structural stability portion C2 are independent of each other and are arranged in a dislocation manner in the radial direction of the hub 1. Looking down at the cooling fan, the second structural stability portion C2 is directly below the air inlet 211 position of the fan frame 21 and is exposed from the air inlet 211 in the axial direction of the hub 1; the first structural stability portion C1 is not exposed from the air inlet 211 in the axial direction of the hub 1. Specifically, the first structural stability portion C1 is directly below the position of the fan frame 21 (specifically, the top plate forming the air inlet 211) adjacent to the air inlet 211.

[0078] Through the design of the above first structural stability portion C1 and second structural stability portion C2, the structure of the auxiliary fan blades 12 can be made more stable. During the rotation of the fan blade assembly 10, the risk of adverse vibration / swing of the auxiliary fan blades 12 can be reduced, thereby reducing the generation of noise. At the same time, the turbulent flow problem of the air flow flowing through the flow channel branch 102 can be improved, and the cooling fan efficiency can be enhanced.

[0079] Please refer to Figure 4As shown, in the present application, the fan blade assembly 10 is defined with a maximum outer diameter A, and the inner ends 121 of the plurality of auxiliary fan blades 12 are defined with a minimum inner diameter B. The maximum outer diameter A and the minimum inner diameter B need to meet the following conditions: 0.8 ≥ B / A ≥ 0.5; in a more preferred embodiment, 0.8 ≥ B / A ≥ 0.5. Among them, the maximum outer diameter A of the fan blade assembly 10 is preferably: 86 mm ≥ A ≥ 26 mm. The total number of the main fan blades 11 is preferably greater than or equal to 28 and less than or equal to 75, and in a more preferred embodiment, the total number of the main fan blades 11 is preferably greater than or equal to 28 and less than or equal to 68. In a preferred embodiment, the flow channel 101 defines a minimum width W1 of the main blade flow channel (not marked in the attached drawing) at one end close to the hub 1, and the flow channel branch 102 defines a minimum width W2 of the auxiliary blade flow channel (not marked in the attached drawing) at one end close to the hub 1. The minimum width W1 of the main blade flow channel and the minimum width W2 of the auxiliary blade flow channel satisfy: W1 ≥ W2, and preferably, W1 = W2.

[0080] Please refer to Figure 4 and Figure 5 As shown, each of the auxiliary fan blades 12 forms a windward surface 1201 and a leeward surface 1202, and the thickness of each of the auxiliary fan blades 12 along the direction perpendicular to the windward surface 1201 and / or the leeward surface 1202 is equal from the inner end 121 to the outer end 122. Each of the auxiliary fan blades 12 forms a windward surface 1201 and a leeward surface 1202, and the thickness of each of the auxiliary fan blades 12 along the direction perpendicular to the windward surface 1201 and / or the leeward surface 1202 is equal from the inner end 121 to the outer end 122. The thickness of any one of the auxiliary fan blades 12 along the direction perpendicular to the windward surface 1201 and / or the leeward surface 1202 is equal to the thickness of any one of the main fan blades 11 along the direction perpendicular to the windward surface 1101 and / or the leeward surface 1102. Of course, it should be noted here that due to processing reasons, there are necessary transition inclined surfaces or arc surfaces (not labeled) designed due to processing at the positions of the inner end 121 and the outer end 122 of the auxiliary fan blade 12. The feature that the above thicknesses are all equal should consider removing the positions of the above transition inclined surfaces or arc surfaces designed due to processing.

[0081] Please refer to Figure 6 As shown, it is the second embodiment of the fan blade assembly 10 of the heat dissipation fan of the present application. The only difference between the second embodiment and the first embodiment ( Figures 1 to 7 and Figure 9 as shown) is that: in the second embodiment: the second structural stability part C2 is connected to the upper edges of the corresponding main fan blades 11 and auxiliary fan blades 12 along the axial direction of the hub 1 and is located at a position close to the hub axis 1 along the radial direction of the hub 1.

[0082] Please refer to Figure 7 As shown, it is the third embodiment of the fan blade assembly 10 of the heat dissipation fan of the present application. The third embodiment and the first embodiment ( Figures 1 to 5and Figure 9 As shown, the only difference in the third embodiment is that: in the third embodiment, the second structural stabilizing portion C2 is not a complete closed-loop structure, but the second structural stabilizing portion C2 is designed as a plurality of independent discontinuous structures. Each single second structural portion C2 is only connected to one auxiliary fan blade 11 and one main fan blade 12 adjacent to the auxiliary fan blade 11. Preferably, a plurality of the second structural portions C2 are located on the same circle coaxial with the hub 1.

[0083] Wherein Figure 7 As shown, there is also another variant of the third embodiment. The only difference between this variant and the third embodiment Figure 7 As shown is that: the first structural stabilizing portion C1 is not a complete closed-loop structure, but the first structural stabilizing portion C1 is designed as a plurality of independent discontinuous structures. Each single first structural portion C1 is only connected to one auxiliary fan blade 11 and one main fan blade 12 adjacent to the auxiliary fan blade 11. Preferably, a plurality of the first structural portions C1 are located on the same circle coaxial with the hub 1.

[0084] Please refer to Figure 8 As shown, this is the fourth embodiment of the fan blade assembly 10 of the heat dissipation fan of the present application. The only difference between the fourth embodiment and the third embodiment ( Figure 7 As shown) is that: the second structural portion C2 is connected to the upper edge of the corresponding main fan blade 11 and auxiliary fan blade 12 along the axial direction of the hub 1 and is located at one end position close to the hub axis 1 along the radial direction of the hub 1.

[0085] Please refer to Figure 10 As shown, this is another variant embodiment of the fan blade assembly 10 of the heat dissipation fan of the present application. The only difference between this variant embodiment and the first embodiment ( Figures 1 to 5 and Figure 9 As shown) is that: the inner end portion 121 of the auxiliary fan blade 12 forms an inclined portion 1211 (so that the position of the inner end portion 121 of the auxiliary fan blade 12 forms an inclined chamfer shape), and an included angle β is formed between the inclined portion 1211 and the axial direction of the hub 1. A preferred implementation is that: the included angle β is greater than 0 degrees and not greater than 75 degrees. In a more preferred implementation, the included angle β is greater than 0 degrees and not greater than 45 degrees. In this variant embodiment, one end of the auxiliary fan blade 12 along the axial direction of the hub 1 is defined as the narrow side portion 1001, and the other end is defined as the wide side portion 1002. The width of the auxiliary fan blade 12 along the radial direction of the hub 1 gradually increases from the narrow side portion 1001 to the wide side portion 1002. The second structural stabilizing portion C2 is arranged at one end position of the wide side portion 1002 adjacent to the hub 1 along the radial direction of the hub 1. In this way, the structural stability of the auxiliary fan blade 12 can be better improved. During the rotation of the fan blade assembly 10, the risk of the auxiliary fan blade 12 generating adverse vibrations / oscillations can be better reduced, and further, the generation of noise and the problem of turbulent flow of the air flowing through the flow channel branch 102 can be improved, so as to improve the efficiency of the heat dissipation fan.

[0086] Please refer to Figure 11 as shown, for this application Figure 10 Another variant of the shown fan blade assembly 10. Compared with Figure 10 the shown embodiment, the difference lies in that: the inclination direction of the inclined portion 1211 and the position where the second structural stability portion C2 is provided are different. It should be satisfied that when there is an inclined portion 1211 in the design, the preferred solution is: one of the first structural stability portion C1 and the second structural stability portion C2 needs to be provided at one end position of the wide side portion 1002 adjacent to the hub 1 in the radial direction of the hub 1. In addition, when there is an inclined portion 1211 in the design, the end point of the minimum inner diameter B defined by the inner ends 121 of the plurality of auxiliary fan blades 12 mentioned above is the end position of the inclined portion 1211 closest to the hub 1 in the radial direction of the hub 1 (that is, the end position of the wide side portion 1002 closest to the hub 1).

[0087] For those skilled in the art, it is obvious that this application is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of this application, this application can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of this application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in this application.

[0088] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation manners that can be understood by those skilled in the art.

Claims

1. An improved fan blade assembly, characterized in that, Comprising: a hub; a plurality of main fan blades extending outward from the outer periphery of the hub, each main fan blade having an air inlet end and an air outlet end, the air inlet end being connected to the hub and the air outlet end being away from the hub, a flow channel being formed between two adjacent main fan blades; a plurality of auxiliary fan blades disposed in the flow channel and extending along the corresponding flow channel, and dividing the corresponding flow channel into at least two flow channel branches at intervals, each auxiliary fan blade having an inner end portion close to the hub and an outer end portion away from the hub, the inner end portion not being connected to the hub; the fan blade assembly is defined with a maximum outer diameter A, and the minimum inner diameter B is defined between the inner end portions of the plurality of auxiliary fan blades, and 0.8 ≥ B / A ≥ 0.5 is satisfied; a first structural stability portion (C1) connecting the auxiliary fan blade and the main fan blade adjacent to the auxiliary fan blade in the circumferential direction of the hub; a second structural stability portion (C2) connecting the auxiliary fan blade and the main fan blade adjacent to the auxiliary fan blade in the circumferential direction of the hub; wherein the first structural stability portion (C1) and the second structural stability portion (C2) are independent of each other and are arranged in a staggered manner in the radial direction of the hub.

2. An improved fan blade assembly, characterized in that, Comprising: a hub; a plurality of main fan blades extending outward from the outer periphery of the hub, each main fan blade having an air inlet end and an air outlet end, the air inlet end being connected to the hub and the air outlet end being away from the hub, a flow channel being formed between two adjacent main fan blades; a plurality of auxiliary fan blades disposed in the flow channel and extending along the corresponding flow channel, and dividing the corresponding flow channel into at least two flow channel branches at intervals, each auxiliary fan blade having an inner end portion close to the hub and an outer end portion away from the hub, the inner end portion not being connected to the hub; a first structural stability portion (C1) connecting the auxiliary fan blade and the main fan blade adjacent to the auxiliary fan blade in the circumferential direction of the hub; a second structural stability portion (C2) connecting the auxiliary fan blade and the main fan blade adjacent to the auxiliary fan blade in the circumferential direction of the hub; wherein the first structural stability portion (C1) and the second structural stability portion (C2) are independent of each other and are arranged in a staggered manner in the radial direction of the hub; an inclined portion formed at one end of the auxiliary fan blade close to the hub axis in the radial direction of the hub.

3. The improved fan blade assembly according to claim 1 or 2, wherein one of the first structural stability portion (C1) and the second structural stability portion (C2) connected to the same auxiliary fan blade is located at the end of the auxiliary fan blade away from the hub, and the other is located at the end of the auxiliary fan blade close to the hub.

4. The improved fan blade assembly according to claim 1 or 2, wherein one of the first structural stability portion (C1) and the second structural stability portion (C2) connected to the same auxiliary fan blade is located at the upper edge position of the corresponding auxiliary fan blade in the axial direction of the hub, and the other is located at the lower edge position of the corresponding auxiliary fan blade in the axial direction of the hub.

5. The improved fan blade assembly according to claim 1 or 2, wherein the first structural stability portion (C1) is a closed circular ring structure coaxial with the hub; and / or, the second structural stability portion (C2) is a closed circular ring structure coaxial with the hub.

6. The improved fan blade assembly according to claim 1 or 2, wherein A plurality of the first structural stabilizing parts (C1) are provided, and each of the first structural stabilizing parts (C1) is only connected to one auxiliary fan blade and one main fan blade adjacent to the auxiliary fan blade; And / or, a plurality of the second structural stabilizing parts (C2) are provided, and each of the second structural stabilizing parts (C2) is only connected to one auxiliary fan blade and one main fan blade adjacent to the auxiliary fan blade.

7. The improved fan blade assembly according to claim 1 or 2, wherein A plurality of the first structural stabilizing parts (C1) are provided, and each of the first structural stabilizing parts (C1) is connected to at least three or more of the total number of a plurality of auxiliary fan blades and a plurality of main fan blades; And / or, a plurality of the second structural stabilizing parts (C2) are provided, and each of the second structural stabilizing parts (C2) is connected to at least three or more of the total number of a plurality of auxiliary fan blades and a plurality of main fan blades.

8. The improved fan blade assembly according to claim 1 or 2, wherein An inclined part is formed at one end of the auxiliary fan blade close to the hub axis in the radial direction of the hub; An included angle β is formed between the inclined part and the axial direction of the hub, and the included angle β is greater than 0 degree and not greater than 75 degrees.

9. The improved fan blade assembly according to claim 8, wherein The included angle β is greater than 0 degree and not greater than 45 degrees.

10. The improved fan blade assembly according to claim 8, wherein One end of the auxiliary fan blade in the axial direction of the hub is defined as a narrow side part, and the other end is defined as a wide side part; The width of the auxiliary fan blade in the radial direction of the hub gradually becomes wider from the narrow side part to the wide side part; One of the first structural stabilizing part (C1) and the second structural stabilizing part (C2) is arranged at a position adjacent to the hub in the radial direction of the wide side part.

11. The improved fan blade assembly according to claim 10, wherein The other of the first structural stabilizing part (C1) and the second structural stabilizing part (C2) is arranged at a position away from the hub in the radial direction of the wide side part; Or, the other of the first structural stabilizing part (C1) and the second structural stabilizing part (C2) is arranged at a position away from the hub in the radial direction of the narrow side part.

12. The improved fan blade assembly according to claim 1 or 2, wherein: One auxiliary fan blade is arranged between any two adjacent main fan blades; Or, two auxiliary fan blades are arranged between any two adjacent main fan blades; Each of the auxiliary fan blades forms a windward surface and a leeward surface, and the thickness of each of the auxiliary fan blades perpendicular to the windward surface and / or the leeward surface is equal from the inner end to the outer end; Each of the main fan blades forms a windward surface and a leeward surface, and the thickness of each of the main fan blades perpendicular to the windward surface and / or the leeward surface is equal from the air inlet end to the air outlet end; The thickness of any one of the auxiliary fan blades perpendicular to the windward surface and / or the leeward surface is equal to the thickness of any one of the main fan blades perpendicular to the windward surface and / or the leeward surface.

13. The improved blade assembly according to claim 12, wherein, The total number of the main fan blades is greater than or equal to 28 and less than or equal to 75.

14. The improved blade assembly according to claim 13, wherein The total number of the main fan blades is greater than or equal to 28 and less than or equal to 68.

15. The improved fan blade assembly according to claim 1 or 2, characterized in that, The flow channel forms a minimum width W1 of the main blade flow channel at one end adjacent to the hub, the flow channel branch forms a minimum width W2 of the auxiliary blade flow channel at one end adjacent to the hub, and W1≥W2.

16. The improved fan blade assembly according to claim 1 or 2, characterized in that, The fan blade assembly is defined with a maximum outer diameter A, and a minimum inner diameter B is defined between the inner ends of multiple auxiliary fan blades, and 0.8≧B / A≧0.7 is satisfied.

17. A cooling fan, comprising the improved blade assembly according to any one of claims 1 to 16, characterized in that, It further includes: A fan frame assembly, which forms an air inlet that penetrates axially along the hub and an air outlet that penetrates radially along the hub; A stator assembly, integrated within the fan frame assembly; A rotating shaft assembly and a magnetic element are integrated on the hub of the fan blade assembly. The fan blade assembly is rotationally coupled within the fan frame through the rotating shaft assembly, and an electromagnetic coupling is formed between the magnetic element and the stator assembly.

18. The cooling fan according to claim 17, wherein The inner ends of each of the auxiliary fan blades extend radially along the hub to directly below the air inlet, and the inner ends are exposed from the air inlet axially along the hub; One of the first structural stability portion (C1) and the second structural stability portion (C2) is located directly below the air inlet position of the fan frame and is exposed from the air inlet axially along the hub; The other of the first structural stability portion (C1) and the second structural stability portion (C2) is not exposed from the air inlet axially along the hub.

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