Fan blade and fan

Abstract

The fan blade comprises a fan blade body, an adjusting structure and an adjusting block, the fan blade body is provided with an inner cavity, the fan blade body is provided with a front edge end and a rear edge end which are arranged at the end of the inner cavity in the width direction, a shearing center is arranged between the front edge end and the rear edge end, the adjusting structure is arranged on the inner surface of the inner cavity, and the adjusting block is arranged on the inner surface of the inner cavity. The adjusting structure is arranged between the front edge end and the plane where the shearing center is located in the width direction of the fan blade body, a plurality of containing cavities which are arranged in the circumferential direction of the inner cavity at intervals are formed in the adjusting structure, and the adjusting block is selectively arranged in at least one containing cavity. According to the fan blade, the structural arrangement that the adjusting structure is matched with the adjusting block is adopted, so that the adjusting block is placed in different containing cavities, then the shearing center of the fan blade is adjusted to be located at different positions, and adjustment of the position of the shearing center is achieved. Therefore, the problem that in the prior art, fan blades are poor in applicability and cannot be adaptively adjusted is solved.

Description

Technical Field

[0001] The present invention relates to the technical field related to wind power generation equipment, and in particular to a fan blade and a fan. Background Art

[0002] As an important part of renewable energy, wind power generation has developed rapidly around the world in recent years, especially in the fields of offshore wind power and low wind speed wind power. With the advancement of wind power technology and the promotion of market demand, the unit capacity of wind turbines has continued to increase, and the length of blades has gradually increased from the initial 30 meters to more than 100 meters. Even the world's longest wind turbine blade has reached 126 meters, which is matched by a 16-18MW offshore wind turbine. Although this large-scale trend has improved the utilization efficiency and economic benefits of wind energy, it has also brought new technical challenges, especially in the aerodynamic-structural dynamics of blades.

[0003] Large wind turbine blades, as a typical long and flexible structure, will undergo elastic deformation under the action of aerodynamic loads. This deformation will further affect the aerodynamic characteristics of the blades, forming a complex coupling relationship between aerodynamics and structure.

[0004] In the design of the fan, in order to improve the fan's energy efficiency, it is necessary to increase the rotation speed of the blades to increase the fan's air output. However, increasing the rotation speed of the blades will increase the momentum of the blades, thereby increasing the lift of the blades. Therefore, in the process of improving the efficiency of the fan, it is necessary to optimize the blade structure to improve the stability of the blade structure. In particular, for blades with a streamlined structure, the lift of the blades can be further improved by adopting materials with better performance and advanced technologies and processes, but the material cost and manufacturing cost will increase.

[0005] The prior art discloses a fan blade, including a blade body, the blade body including an inner cavity, the cross-section of the blade body presents a streamlined structure, the cross-section of the inner cavity presents a streamlined structure, the inner cavity is arranged along the length direction of the blade body, one end of the inner cavity is provided with an air inlet, the other end of the inner cavity is provided with an air outlet, a plurality of reinforcing ribs are provided in the blade body, the plurality of reinforcing ribs are evenly arranged along the length direction of the blade body, the plurality of reinforcing ribs surround a sandwich chamber, one end of the sandwich chamber is connected to the air outlet, and the other end of the sandwich chamber is connected to the inner cavity.

[0006] However, current improvements to the structure of fan blades all adopt a fixed structural setting, which is limited in usage scenarios and cannot be adjusted in real time to adapt to different environmental loads.

[0007] As can be seen from the above, the fan blades in the prior art have the problem of poor applicability and inability to be adaptively adjusted. Summary of the invention

[0008] The main purpose of the present invention is to provide a fan blade and a fan to solve the problem that the fan blades in the prior art have poor applicability and cannot be adaptively adjusted.

[0009] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a fan blade is provided, which includes a blade body, an adjustment structure and an adjustment block. The blade body has an inner cavity, and the blade body has a leading edge end and a trailing edge end arranged at the ends of the inner cavity along the width direction, and the shear center is arranged between the leading edge end and the trailing edge end. The adjustment structure is arranged on the inner surface of the inner cavity, and the adjustment structure is arranged between the plane where the leading edge end and the shear center are located along the width direction of the blade body. The adjustment structure has a plurality of spaced accommodating cavities arranged along the circumference of the inner cavity, and the adjustment block can be selectively arranged inside at least one of the accommodating cavities.

[0010] Furthermore, along the height direction of the fan blade body, two inner surfaces of the inner cavity that are arranged opposite to each other are provided with adjustment structures, and the two adjustment structures are symmetrically arranged.

[0011] Furthermore, the adjustment block is a magnetic counterweight block, a magnetic attraction component is provided inside the accommodating cavity, and the magnetic attraction component is magnetically connected to the counterweight block; and / or a slot is formed inside the accommodating cavity, and the counterweight block is clamped inside the slot.

[0012] Furthermore, the adjustment block is a structural member made of a flexible material filled in the accommodating cavity.

[0013] Furthermore, along the length direction of the fan blade body, the distance between the adjustment structure and the blade root of the fan blade body is greater than the distance between the adjustment structure and the blade tip of the fan blade body.

[0014] Furthermore, the fan blade also includes a reinforcing plate, which is arranged in the inner cavity, one end of the reinforcing plate is rotatably arranged on the inner surface of the blade body, and the other end of the reinforcing plate rotates toward or away from the leading edge end along the width direction of the blade body.

[0015] Furthermore, the fan blade also includes a rotating shaft and a damping member. A groove structure connected to the inner cavity is formed on the inner surface of the blade body, and the groove structure extends along the length direction of the blade body. At least a portion of the rotating shaft is rotatably arranged inside the groove structure. The reinforcing plate is connected to the rotating shaft. The damping member is arranged between the inner wall surface of the groove structure and the outer surface of the rotating shaft to provide damping force.

[0016] Furthermore, the fan blade also includes a driving component, which is arranged in the inner cavity and is drivingly connected to the rotating shaft.

[0017] Furthermore, at least one surface of the reinforcing plate along the height direction is an arc-shaped plate, and the inner cavity along the height direction of the wind blade body has a first surface and a second surface relatively arranged, and the reinforcing plate is rotatably arranged on the first surface, and the reinforcing plate has a first position that is in contact with the first surface of the inner cavity and a second position that is in contact with the second surface of the inner cavity. When the reinforcing plate is in the first position, the surface of the reinforcing plate is in contact with the inner surface of the inner cavity.

[0018] According to another aspect of the present invention, a fan is provided, and the fan comprises the above-mentioned fan blade.

[0019] According to the technical solution of the present invention, a fan blade includes a blade body, an adjustment structure and an adjustment block. The blade body has an inner cavity. The blade body has a leading edge end and a trailing edge end arranged at the ends of the inner cavity along the width direction. The shear center is arranged between the leading edge end and the trailing edge end. The adjustment structure is arranged on the inner surface of the inner cavity. The adjustment structure is arranged between the plane where the leading edge end and the shear center are located along the width direction of the blade body. The adjustment structure has a plurality of spaced accommodating cavities arranged along the circumference of the inner cavity. The adjustment block can be optionally arranged inside at least one of the accommodating cavities.

[0020] As can be seen from the above, the fan blades of the present application adopt the structural setting of the adjustment structure in conjunction with the adjustment block, so as to adjust the shear center of the fan blades to different positions by placing the adjustment blocks inside different accommodating cavities, thereby adjusting the shear center position. In the present application, when the loads on the fan blades are different, the position of the shear center of the fan blades can be adaptively changed through the adjustment structure and the adjustment block, thereby improving the stability of the fan blades, ensuring the long-term stability of the fan blades, and helping to improve the power generation efficiency of the fan.

[0021] The adjustment structure of the present application is arranged on the inner surface of the inner cavity, and the multiple accommodating cavities of the adjustment structure are arranged along the circumference of the cross-section of the fan blade body along the width direction. The adjustment block and the multiple accommodating cavities form a matching structure to achieve that the adjustment block cooperates with different accommodating cavities to adjust the position of the shear center of the fan blade body and improve the stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 A schematic diagram showing the adjustment structure of the width direction cross section of the fan blade of the present invention;

[0024] Figure 2 A schematic diagram of a reinforcing plate of a fan blade in a width direction cross section of the present invention is shown, wherein the reinforcing plate is in a first position;

[0025] Figure 3 A schematic diagram showing a reinforcing plate of a cross section in the width direction of a fan blade of the present invention is shown, wherein the reinforcing plate is in a second position;

[0026] Figure 4 A schematic diagram showing the adjustment structure of the lengthwise cross section of the fan blade of the present invention.

[0027] The above drawings include the following reference numerals:

[0028] 10. Fan blade body; 110. Inner cavity; 120. Leading edge end; 130. Trailing edge end; 140. Blade root; 150. Blade tip; 20. Adjustment structure; 210. Accommodation cavity; 30. Adjustment block; 40. Reinforcement plate; 50. Rotating shaft. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0031] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0032] In order to solve the problem that the fan blades in the prior art have poor applicability and cannot be adaptively adjusted, the present application provides a fan.

[0033] Among them, the wind turbine of the present application is a large-scale wind power generation wind turbine, which is used in offshore wind farms.

[0034] Specifically, the fan includes a fan body and fan blades arranged on the fan body, and the fan body drives the fan blades to rotate.

[0035] In this embodiment, the fan blades are provided with a structure so that the shear center of the fan blades can be adjusted so that the shear center can move closer to or away from the leading edge 120, which is beneficial to improving the operating stability of the fan blades. The fan blades are suitable for a variety of different scenarios, that is, the position of the shear center can be adjusted according to different scenarios to improve the stability of the fan blades, which is beneficial to improving the power generation efficiency.

[0036] like Figures 1 to 4 As shown, the fan blade includes a blade body 10, an adjustment structure 20 and an adjustment block 30. The blade body 10 has an inner cavity 110. The blade body 10 has a leading edge end 120 and a trailing edge end 130 arranged at the ends of the inner cavity 110 along the width direction. The shear center is arranged between the leading edge end 120 and the trailing edge end 130. The adjustment structure 20 is arranged on the inner surface of the inner cavity 110. The adjustment structure 20 is arranged between the leading edge end 120 and the plane where the shear center is located along the width direction of the blade body 10. The adjustment structure 20 has a plurality of spaced accommodating cavities 210 arranged circumferentially along the inner cavity 110. The adjustment block 30 can be optionally arranged inside at least one of the accommodating cavities 210.

[0037] Among them, the cross-section of the fan blade is a streamlined structure, and the cross-section of the inner cavity 110 is a streamlined structure, which is formed in sequence along the width direction of the fan blade into a leading edge end 120, an aerodynamic center inside the cross-section, a shear center inside the cross-section and a trailing edge end 130.

[0038] In order to improve the strength of the fan blade, the shear center of the fan blade can be adjusted so that the shear center of the fan blade is close to the aerodynamic center, thereby improving the strength of the fan blade. The fan blade is not easily deformed by force, which is conducive to achieving the purpose of load reduction and improving the air-elastic coupling effect. It is also conducive to achieving the stability of the fan blade during long-term outdoor work. In this embodiment, the shear center is close to the aerodynamic center of the fan blade cross section and is not easy to deform and has good stability, which is conducive to ensuring the stability of the fan blade during long-term operation.

[0039] The plane where the shear center lies is Figure 1 The length direction of the fan blade body 10 is Figure 4 The width direction of the fan blade body 10 is Figure 1 In the Y direction shown, the height direction of the fan blade body 10 is Figure 1 The Z direction is shown.

[0040] Specifically, the fan blades of the present application adopt the structural setting of the adjustment structure 20 in conjunction with the adjustment block 30, so as to adjust the shear center of the fan blades to different positions by placing the adjustment block 30 inside different accommodating cavities 210, thereby adjusting the shear center position. In the present application, when the loads on the fan blades are different, the position of the shear center of the fan blades can be adaptively changed through the adjustment structure 20 and the adjustment block 30, thereby improving the stability of the fan blades, ensuring the long-term stability of the fan blades, and helping to improve the power generation efficiency of the fan.

[0041] In this embodiment, the adjustment structure 20 of the present application is arranged on the inner surface of the inner cavity 110, and the multiple accommodating cavities 210 of the adjustment structure 20 are arranged circumferentially along the cross-section of the fan blade body 10 along the width direction. The adjustment block 30 and the multiple accommodating cavities 210 form a matching structure to achieve the adjustment block 30 and different accommodating cavities 210 to adjust the position of the shear center of the fan blade body 10 and improve the stability of the overall structure.

[0042] It can be understood that the adjustment structure 20 has a plurality of independent storage compartments, and the storage compartments form a plurality of accommodating cavities 210. The adjustment block 30 can be placed into the interior of the accommodating cavity 210, and can also be moved out from the interior of the accommodating cavity 210, thereby realizing the position movement of the shear center according to the different accommodating cavities 210 in which the adjustment block 30 is placed, or according to the different numbers of adjustment blocks 30 placed in the accommodating cavity 210.

[0043] In this embodiment, along the height direction of the fan blade body 10, the two inner surfaces of the inner cavity 110 that are opposite to each other are provided with adjustment structures 20, and the two adjustment structures 20 are symmetrically arranged. The use of the symmetrically arranged adjustment structures 20 is conducive to ensuring the uniformity of the overall structure and further improving the stability of the overall structure; at the same time, the use of the adjustment structures 20 that are arranged on the two inner surfaces of the inner cavity 110 that are opposite to each other, thereby increasing more accommodating cavities 210, so as to facilitate the placement of the adjustment block 30 in different accommodating cavities 210 for adjusting the shear center, which is conducive to improving the accuracy of the shear center adjustment and ensuring the stability of the fan blade.

[0044] In this embodiment, the adjustment block 30 is fixedly disposed inside the accommodating cavity 210 to prevent the adjustment block 30 from shaking or shifting inside the accommodating cavity 210 when the fan blades rotate, thereby preventing the corresponding structural stability from occurring.

[0045] The adjustment block 30 is a magnetic counterweight block, and a magnetic attraction member is disposed inside the accommodating cavity 210. The magnetic attraction member is magnetically connected to the counterweight block. The magnetic connection structure is adopted to facilitate the detachable arrangement of the adjustment block 30, thereby facilitating the adjustment of the position of the shear center and improving the assembly efficiency of the overall structure. The counterweight block can be a weight of an iron block to facilitate magnetic fixation.

[0046] The adjusting block 30 is a magnetic counterweight, and a slot is formed inside the accommodating cavity 210, and the counterweight is clamped inside the slot. The structure of clamping and fixing the adjusting block 30 is conducive to improving the fixing strength of the adjusting block 30 and ensuring the stability of the overall structure.

[0047] In another embodiment, the adjustment block 30 is a structural member of a flexible material filled inside the accommodating cavity 210. That is, the adjustment block 30 is filled with a flexible material toward the inside of the accommodating cavity 210 to achieve the movement of the shear center, and the structural member of the flexible material can be cloth or the like.

[0048] like Figure 4 As shown, along the length direction of the fan blade body 10 , the distance between the adjustment structure 20 and the blade root 140 of the fan blade body 10 is greater than the distance between the adjustment structure 20 and the blade tip 150 of the fan blade body 10 .

[0049] Specifically, the adjustment structure 20 of the present application is arranged close to one side of the blade tip 150, which is conducive to adjusting the shear center on one side of the blade tip 150, thereby achieving adaptive load reduction in the blade tip 150 area. The blade tip 150 end is more affected by the aerodynamic load caused by wind speed changes. The structural setting of the present application is conducive to ensuring the stability of the structure at the blade tip 150 position.

[0050] In this embodiment, if Figure 2 and Figure 3 As shown, the fan blade also includes a reinforcing plate 40, which is arranged in the inner cavity 110, one end of the reinforcing plate 40 is rotatably arranged on the inner surface of the blade body 10, and the other end of the reinforcing plate 40 rotates toward or away from the leading edge end 120 along the width direction of the blade body 10.

[0051] Specifically, a rotatable reinforcing plate 40 is used, and the shear center of the overall structure of the fan blade can be adjusted during the rotation of the reinforcing plate 40. The overall structure is simple and easy to operate.

[0052] In this embodiment, at least one surface of the reinforcing plate 40 along the height direction is an arc-shaped plate, and the inner cavity 110 has a first surface and a second surface relatively arranged along the height direction of the wind blade body 10. The reinforcing plate 40 is rotatably arranged on the first surface, and the reinforcing plate 40 has a first position that is in contact with the first surface of the inner cavity 110 and a second position that is in contact with the second surface of the inner cavity 110. When the reinforcing plate 40 is in the first position, the surface of the reinforcing plate 40 is in contact with the inner surface of the inner cavity 110.

[0053] The reinforcing plate 40 switches between a first position and a second position. When the reinforcing plate 40 is in the first position, the reinforcing plate 40 is arranged on the surface of the inner cavity 110, which is beneficial to ensure the stability of the structure in which the reinforcing plate 40 is arranged, and is also beneficial to the uniformity of the arrangement of the overall structure.

[0054] The fan blade further includes a rotating shaft 50, a groove structure communicating with the inner cavity 110 is formed on the inner surface of the fan body 10, the groove structure extends along the length direction of the fan body 10, at least a portion of the rotating shaft 50 is rotatably arranged inside the groove structure, and the reinforcing plate 40 is connected to the rotating shaft 50. The reinforcing plate 40 is rotatably arranged in the inner cavity 110 through the rotating shaft 50, which is conducive to ensuring the smoothness of the switching of the reinforcing plate 40, thereby improving the operability of the overall structure.

[0055] In this embodiment, the fan blade further includes a damping member, which is disposed between the inner wall surface of the groove structure and the outer surface of the rotating shaft 50 to provide a damping force. The damping force is used to achieve relative fixation of the reinforcing plate 40 and the rotating shaft 50, and then the reinforcing plate 40 is fixed in the inner cavity 110 when no external force is applied, thereby ensuring the stability of the overall structure.

[0056] In this embodiment, in order to ensure that the reinforcing plate 40 can be automatically adjusted to achieve real-time adjustment of the shear center, the fan blade of the present application also includes a driving member, which is arranged in the inner cavity 110 and is drivingly connected to the rotating shaft 50. The driving member can be a motor, and the rotation position of the reinforcing plate 40 can be adjusted under the drive of the motor. The driving member can adjust the position of the reinforcing plate 40 in real time to adjust the shear center of the fan blade, thereby maintaining the fan blade with a setting that is adapted to the externally applied load during operation, thereby ensuring the stability of the fan blade structure.

[0057] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0058] The fan blades of the present application adopt the structural setting of the adjustment structure 20 in conjunction with the adjustment block 30, so as to adjust the shear center of the fan blades to different positions by placing the adjustment block 30 inside different accommodating cavities 210, thereby adjusting the shear center position. In the present application, when the loads on the fan blades are different, the position of the shear center of the fan blades can be adaptively changed through the adjustment structure 20 and the adjustment block 30, thereby improving the stability of the fan blades, ensuring the long-term stability of the fan blades, and helping to improve the power generation efficiency of the fan.

[0059] The adjustment structure 20 of the present application is arranged on the inner surface of the inner cavity 110, and the multiple accommodating cavities 210 of the adjustment structure 20 are arranged circumferentially along the cross-section of the fan blade body 10 along the width direction. The adjustment block 30 and the multiple accommodating cavities 210 form a matching structure to achieve the adjustment block 30 and different accommodating cavities 210 to adjust the position of the shear center of the fan blade body 10 and improve the stability of the overall structure.

[0060] In order to ensure that the reinforcing plate 40 can be automatically adjusted to achieve real-time adjustment of the shear center, the fan blade of the present application also includes a driving member, which is arranged in the inner cavity 110 and is drivingly connected to the rotating shaft 50. The driving member can be a motor, and the rotation position of the reinforcing plate 40 can be adjusted under the drive of the motor. The driving member can adjust the position of the reinforcing plate 40 in real time to adjust the shear center of the fan blade, so that the fan blade can maintain a setting that is compatible with the externally applied load during operation, thereby ensuring the stability of the fan blade structure.

[0061] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fan blade with adjustable shear center, characterized in that: include: A fan blade body (10), the fan blade body (10) having an inner cavity (110), the fan blade body (10) having a leading edge end (120) and a trailing edge end (130) arranged at the ends of the inner cavity (110) along the width direction, and a shear center arranged between the leading edge end (120) and the trailing edge end (130); an adjusting structure (20), the adjusting structure (20) being arranged on the inner surface of the inner cavity (110), the adjusting structure (20) being arranged between the leading edge end (120) and the plane where the shear center is located along the width direction of the fan blade body (10), and the adjusting structure (20) having a plurality of accommodating cavities (210) arranged at intervals along the circumference of the inner cavity (110); An adjustment block (30), wherein the adjustment block (30) can be selectively arranged inside at least one of the accommodating chambers (210).

2. The fan blade according to claim 1, characterized in that: Along the height direction of the fan blade body (10), the two inner surfaces of the inner cavity (110) that are arranged opposite to each other are provided with the adjustment structure (20), and the two adjustment structures (20) are symmetrically arranged.

3. The fan blade according to claim 1, characterized in that: The adjustment block (30) is a magnetic counterweight block. A magnetic attraction component is disposed inside the accommodating cavity (210), and the magnetic attraction component is magnetically connected to the counterweight block; and / or A slot is formed inside the accommodating cavity (210), and the counterweight block is snap-connected inside the slot.

4. The fan blade according to claim 1, characterized in that: The adjustment block (30) is a structural member made of a flexible material and filled inside the accommodating cavity (210).

5. The fan blade according to claim 1, characterized in that: Along the length direction of the fan blade body (10), the distance between the adjustment structure (20) and the blade root (140) of the fan blade body (10) is greater than the distance between the adjustment structure (20) and the blade tip (150) of the fan blade body (10).

6. The fan blade according to any one of claims 1 to 5, characterized in that: The fan blades also include: A reinforcing plate (40), wherein the reinforcing plate (40) is arranged in the inner cavity (110), one end of the reinforcing plate (40) is rotatably arranged on the inner surface of the fan blade body (10), and the other end of the reinforcing plate (40) is rotated toward or away from the leading edge end (120) along the width direction of the fan blade body (10).

7. The fan blade according to claim 6, characterized in that: The fan blades also include: A rotating shaft (50), a groove structure communicating with the inner cavity (110) is formed on the inner surface of the fan blade body (10), the groove structure extends along the length direction of the fan blade body (10), at least a part of the rotating shaft (50) is rotatably arranged inside the groove structure, and the reinforcing plate (40) is connected to the rotating shaft (50); A damping member is arranged between the inner wall surface of the groove structure and the outer surface of the rotating shaft (50) and is used to provide a damping force.

8. The fan blade according to claim 7, characterized in that: The fan blades also include: A driving member, wherein the driving member is disposed in the inner cavity (110) and is drivingly connected to the rotating shaft (50).

9. The fan blade according to claim 6, characterized in that: At least one surface of the reinforcing plate (40) along the height direction is an arc-shaped plate. The inner cavity (110) has a first surface and a second surface that are arranged opposite to each other along the height direction of the fan blade body (10); the reinforcing plate (40) is rotatably arranged on the first surface; the reinforcing plate (40) has a first position that is in contact with the first surface of the inner cavity (110) and a second position that is in contact with the second surface of the inner cavity (110); when the reinforcing plate (40) is in the first position, the surface of the reinforcing plate (40) is in contact with the inner surface of the inner cavity (110).

10. A fan, characterized in that: The invention comprises the fan blade according to any one of claims 1 to 9.

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