A fan blade structure

Abstract

The utility model belongs to the technical field of ventilation equipment, concretely relates to a fan blade structure, including main part and fan blade, the fan blade is provided with a plurality of, a plurality of fan blade surrounds the main part interval setting, the profile edge of each fan blade includes the leaf inner edge, the leaf front edge, the leaf outer edge and the leaf tail edge that are connected in proper order, each fan blade is connected with the main part through the leaf inner edge, the leaf tail edge of each fan blade is connected with the flow guide portion, the flow guide portion is bent to the pressure surface of fan blade, the flow guide portion is provided with a plurality of first recess, each first recess extends from the leaf tail edge to the direction of leaf front edge, a plurality of first recesses arrange from the direction of leaf outer edge to the direction of leaf inner edge, effectively the tail vortex that originally can form large -scale, concentrated peeling is divided into the flow of multiple thin, weaken the non - stationary pressure pulsation caused by the vortex periodic peeling, fundamentally reduce the sound source intensity of noise, realize the effect of noise reduction.

Description

Technical Field

[0001] This utility model belongs to the field of ventilation equipment technology, and specifically relates to a fan blade structure. Background Technology

[0002] Fan blades, as a fundamental pneumatic or fluid mechanical component, are widely used in ventilation, refrigeration, air circulation, and many other fields. Traditional fan blades typically consist of a hub and several blades extending radially or approximately radially from the hub. During blade rotation, a pressure difference is created between the pressure surface and the suction surface of the blades, thereby generating a force that propels the fluid.

[0003] However, in the existing fan blade structure, during operation, when the two airflows from the pressure and suction sides converge in the trailing edge region of the blade, the significant difference in pressure and velocity causes a series of unstable vortices, namely wake vortices, to be formed and periodically shed. During the generation, shedding, and dissipation of these wake vortices, severe unsteady pressure pulsations occur in the surrounding flow field. These pressure pulsations act as a sound source, directly radiating broadband aerodynamic noise into the far field, severely impacting the application of the fan blade structure in applications requiring low noise. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a fan blade structure that solves the technical problem of periodic detachment of wake vortices in the trailing edge region of the fan blade structure due to the convergence of airflow on both sides of the pressure and suction surfaces. This causes severe unsteady pressure pulsations and radiates significant broadband aerodynamic noise, limiting its application in low-noise environments.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a fan blade structure, including a main body and fan blades. Multiple fan blades are arranged at intervals around the main body. The outline edge of each fan blade includes an inner edge, a leading edge, an outer edge, and a trailing edge connected sequentially. Each fan blade is connected to the main body via its inner edge. A guide portion is connected to the trailing edge of each fan blade. The guide portion bends towards the pressure surface of the fan blade. The guide portion has multiple first grooves, each extending from the trailing edge to the leading edge. The multiple first grooves are arranged from the outer edge to the inner edge.

[0007] In some embodiments, a plurality of the first grooves are disposed on the suction surface of the fan blade;

[0008] Alternatively, from the outer edge of the blade to the inner edge of the blade, the guide portion has multiple alternating peaks and troughs, and from the pressure surface of the fan blade to the suction surface of the fan blade, the troughs protrude from the peaks, forming the first groove.

[0009] In some embodiments, the thickness of the guide portion at the trough is greater than the thickness of the guide portion at the crest.

[0010] And / or, from the leading edge of the leaf to the trailing edge of the leaf, the depth of each of the first grooves gradually decreases and increases.

[0011] In some embodiments, the thickness of the guide portion at the end near the outer edge of the blade is less than the thickness of the guide portion at the end near the inner edge of the blade;

[0012] And / or, the thickness of the end of the guide portion away from the blade trailing edge is less than the thickness of the end of the guide portion near the blade trailing edge;

[0013] And / or, the length of the end of the guide portion near the outer edge of the blade is greater than the length of the end of the guide portion near the inner edge of the blade.

[0014] In some embodiments, the suction surface of the fan blade is provided with a reinforcing structure.

[0015] In some embodiments, the fan blade includes a first connecting portion and a second connecting portion, the first connecting portion being connected to the main body via the second connecting portion, and the reinforcing structure including a first reinforcing rib located at the first connecting portion;

[0016] And / or, the reinforcing structure includes a second reinforcing rib located in the connection area between the first connecting portion and the second connecting portion.

[0017] In some embodiments, when the reinforcing structure includes a first reinforcing rib, a plurality of first reinforcing ribs are provided, and the plurality of first reinforcing ribs are spaced apart from the outer edge of the leaf to the inner edge of the leaf, and the plurality of first reinforcing ribs all extend from the trailing edge of the leaf to the leading edge of the leaf.

[0018] When the reinforcing structure includes a second reinforcing rib, and multiple second reinforcing ribs are provided, the multiple second reinforcing ribs are spaced apart from the blade trailing edge to the blade leading edge, and the end of each second reinforcing rib away from the main body is inclined in the opposite direction to the rotation direction of the blade.

[0019] In some embodiments, the first connecting portion has a concave surface and a convex surface, the concave surface and the convex surface are disposed opposite to each other, and the concave surface is recessed into the pressure surface of the fan blade, and the convex surface protrudes outward from the suction surface of the fan blade.

[0020] In some embodiments, the main body is provided with a mounting protrusion on one side of the suction surface of the fan blade, the mounting protrusion is provided with a mounting hole, the mounting hole penetrates the main body and the mounting protrusion, and a plurality of third reinforcing ribs are provided at intervals around the periphery of the mounting protrusion.

[0021] In some embodiments, the main body is provided with a plurality of second grooves on one side of the suction surface of the fan blade, the plurality of second grooves are arranged around the mounting protrusion, and each second groove is located between two adjacent third reinforcing ribs.

[0022] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0023] The fan blade structure of this embodiment utilizes a combination of a main body and blades. Multiple blades are spaced around the main body, and each blade's trailing edge is connected to a guide section. This guide section bends towards the pressure surface of the blade, effectively reducing the shear intensity at the intersection of the suction and pressure surfaces. By providing multiple first grooves in the guide section, extending from the trailing edge to the leading edge and arranged from the outer edge to the inner edge, the potentially large-scale, concentrated wake vortices are effectively divided into multiple finer flows. This promotes vortex miniaturization and early dissipation, thereby weakening the unsteady pressure pulsations caused by the periodic shedding of vortices. This fundamentally reduces the intensity of broadband aerodynamic noise sources, and the faster dissipation of smaller vortices reduces continuous noise radiation, achieving a noise reduction effect. This makes the fan blade structure suitable for scenarios with high noise control requirements. The guide section effectively reduces energy dissipation and flow loss caused by strong vortex shedding, allowing more energy to be effectively used to propel the fluid, thus improving the aerodynamic efficiency of the fan blade structure. Meanwhile, a more stable and uniform wake flow field helps reduce airflow pulsation during operation, improving the stability and uniformity of the overall flow field.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is one of the structural schematic diagrams of the fan blade structure of this utility model.

[0027] Figure 2 This is the second schematic diagram of the fan blade structure of this utility model.

[0028] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0029] Figure 4 This is the third schematic diagram of the fan blade structure of this utility model.

[0030] Figure 5 This is the fourth schematic diagram of the fan blade structure of this utility model.

[0031] Figure 6 for Figure 5 A magnified structural diagram at point B in the middle.

[0032] Figure 7 This is the fifth schematic diagram of the fan blade structure of this utility model.

[0033] The reference numerals in the attached figures are explained as follows:

[0034] 100. Fan-blade structure;

[0035] 10. Main body; 11. Mounting protrusion; 12. Mounting hole; 13. Third reinforcing rib; 14. Second groove;

[0036] 20. Blade; 21. Inner edge of blade; 22. Leading edge of blade; 23. Outer edge of blade; 24. Trailing edge of blade; 25. Pressure surface; 26. Suction surface; 27. First connecting part; 271. Concave surface; 272. Convex surface; 28. Second connecting part;

[0037] 30. Guide section; 31. First groove; 32. Crest; 33. Trough;

[0038] 40. Strengthen the structure; 41. First reinforcing rib; 42. Second reinforcing rib. Detailed Implementation

[0039] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0040] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] The following will be combined with the appendix Figures 1-7 The technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0043] Please see Figures 1-7 The fan blade structure 100 of this utility model embodiment includes a main body 10 and fan blades 20. Multiple fan blades 20 are provided and are arranged at intervals around the main body 10. The outline edge of each fan blade 20 includes an inner edge 21, a leading edge 22, an outer edge 23, and a trailing edge 24 connected end to end in sequence. Each fan blade 20 is connected to the main body 10 through the inner edge 21. Each trailing edge 24 of each fan blade 20 is connected to a guide portion 30. The guide portion 30 is bent toward the pressure surface 25 of the fan blade 20. The guide portion 30 is provided with multiple first grooves 31. Each first groove 31 extends from the trailing edge 24 toward the leading edge 22. The multiple first grooves 31 are arranged from the outer edge 23 toward the inner edge 21.

[0044] Compared with the prior art, the fan blade structure 100 of this utility model uses the main body 10 and the fan blades 20 in cooperation. Multiple fan blades 20 are arranged around the main body 10 at intervals. Each fan blade 20 has a guide portion 30 connected to its trailing edge 24. The guide portion 30 bends toward the pressure surface 25 of the fan blade 20, which effectively reduces the shear strength when the airflow from the suction surface 26 and the pressure surface 25 converges. By setting multiple first grooves 31 in the guide section 30, extending from the trailing edge 24 to the leading edge 22 and arranged from the outer edge 23 to the inner edge 21, the potentially large-scale, concentrated wake vortex is effectively divided into multiple finer flows. This promotes the miniaturization and early dissipation of the vortex, thereby weakening the unsteady pressure pulsation caused by the periodic shedding of the vortex. This fundamentally reduces the intensity of the broadband aerodynamic noise source, and the smaller vortex dissipates faster, reducing the continuous radiation of noise and achieving a noise reduction effect. This makes the fan blade structure 100 suitable for scenarios with high noise control requirements. The guide section 30 effectively reduces energy dissipation and flow loss caused by strong vortex shedding, allowing more energy to be effectively used to propel the fluid, thus helping to improve the aerodynamic efficiency of the fan blade structure 100. At the same time, a more stable and uniform wake flow field helps to reduce airflow pulsation during operation, improving the stability and uniformity of the overall flow field.

[0045] It should be noted that the upstream of the airflow is the front, and the downstream of the airflow is the rear. Therefore, the trailing edge 24 of the blade is the rear edge of the blade 20 that is closer to the downstream airflow. The suction surface 26 of the blade 20 is located on the air inlet side of the blade 20, that is, a negative pressure zone will be formed on the suction surface 26, and the pressure surface 25 of the blade 20 is the surface opposite to the suction surface 26.

[0046] It should be noted that the fan blade 20 and the guide section 30 are integrally molded structures.

[0047] In some embodiments, a plurality of first grooves 31 are provided on the suction surface 26 of the fan blade 20; or, from the outer edge 23 of the blade to the inner edge 21 of the blade, the guide portion 30 has a plurality of alternating peaks 32 and valleys 33, and from the pressure surface 25 of the fan blade 20 to the suction surface 26 of the fan blade 20, the valleys 33 protrude from the peaks 32, and the valleys 33 form the first grooves 31.

[0048] By setting the first groove 31 on the suction surface 26 of the fan blade 20, which is typically a region with high flow velocity and low static pressure, and is also the side where the vorticity in the wake vortex is mainly concentrated, the first groove 31 on the suction surface 26 creates directional disturbance and guidance for the airflow on the suction surface 26, effectively weakening the instability of the shear layer on the suction surface 26 side in advance. This makes the energy distribution of the airflow on the suction surface 26 more uniform before it meets the airflow on the pressure surface 25, thereby reducing the possibility of generating large-scale, high-intensity wake vortices at the source. This can more effectively suppress the generation of the main noise source and further improve the noise reduction effect. Through the combined use of crests 32 and troughs 33, the alternating crests 32 and troughs 33 form a continuous wavy trailing edge. The wavy trailing edge can naturally divide and guide the airflow exiting the blade trailing edge 24 in the direction from the outer edge 23 to the inner edge 21, effectively preventing the airflow from forming a wake vortex.

[0049] In some embodiments, the thickness of the guide section 30 at the trough 33 is greater than the thickness of the guide section 30 at the crest 32; and / or, the depth of each first groove 31 gradually decreases and increases from the leading edge 22 to the trailing edge 24. Because the aerodynamic load on the guide section 30 at the trough 33 is more complex and concentrated, by making the thickness of the guide section 30 at the trough 33 greater than the thickness of the guide section 30 at the crest 32, the structural strength of the guide section 30 at the trough 33 is effectively increased, thereby effectively preventing deformation or cracking caused by periodic aerodynamic loads and ensuring the structural integrity of the guide section 30 under long-term high-speed operation. By gradually increasing the depth of the first groove 31 from the leading edge 22 to the trailing edge 24, as the airflow flows from the leading edge 22 to the blade 20 and along the blade surface towards the trailing edge 24, the velocity and energy gradually accumulate, reaching their maximum at the trailing edge 24, where the difference between the airflow and the airflow at the pressure surface 25 reaches its maximum, and the wake vortex generation intensity is also the highest. The groove depth gradually increases with the airflow path. The shallow groove at the leading edge 22 only slightly guides the initial stable airflow, avoiding excessive disturbance that could cause additional losses. Towards the trailing edge 24, the groove deepens synchronously with the increase in airflow energy, providing stronger airflow segmentation and vortex cutting capabilities. It precisely targets strong vortex areas to achieve powerful fragmentation, dispersing large-scale wake vortices into easily dissipated small-scale vortices, fundamentally reducing the noise source intensity.

[0050] In some embodiments, the thickness of the guide portion 30 at the end near the outer edge 23 of the blade is less than the thickness of the guide portion 30 at the end near the inner edge 21 of the blade; and / or, the thickness of the guide portion 30 at the end away from the trailing edge 24 of the blade is less than the thickness of the guide portion 30 at the end near the trailing edge 24 of the blade; and / or, the length of the guide portion 30 at the end near the outer edge 23 of the blade is greater than the length of the guide portion 30 at the end near the inner edge 21 of the blade.

[0051] During operation, the end of the guide section 30 near the inner edge 21 of the blade experiences the greatest centrifugal force and bending moment, making it a critical area for structural stress. By making the thickness of the end of the guide section 30 near the outer edge 23 of the blade smaller than the thickness of the end near the inner edge 21, the thickness of the end of the guide section 30 near the inner edge 21 is effectively increased, enhancing the structural strength of this end and preventing deformation or breakage during high-speed rotation. Conversely, thinning the end of the guide section 30 near the outer edge 23 reduces its own weight, decreases the additional load from centrifugal force, and reduces airflow resistance, preventing airflow separation. Furthermore, by making the thickness of the end of the guide section 30 away from the trailing edge 24 smaller than the thickness of the end near the trailing edge 24, the thickness of this end of the guide section 30 is effectively reduced, minimizing excessive disturbance to the airflow, preventing the formation of secondary turbulence, and improving the smoothness during merging. The airflow path at the outer edge 23 is long and the velocity is high. It is the main area for wake vortex generation and requires a longer guide section 30 to fully guide the airflow and cut the vortex. The airflow at the inner edge 21 is relatively gentle, and a shorter guide section 30 is sufficient to meet the flow control requirements. By making the length of the guide section 30 near the outer edge 23 greater than the length of the guide section 30 near the inner edge 21, the drag and weight increase caused by redundant design are effectively avoided.

[0052] In some embodiments, the suction surface 26 of the fan blade 20 is provided with a reinforcing structure 40. By providing the reinforcing structure 40 to the suction surface 26 of the fan blade 20, the suction surface 26 is a critical area through which airflow flows at high speed when the fan blade 20 rotates. Here, the airflow velocity is high and the pressure is low, which easily forms a negative pressure traction effect. At the same time, the fan blade 20 also needs to withstand the centrifugal force brought about by high-speed rotation. The reinforcing structure 40 can effectively enhance the structural load-bearing capacity of the suction surface 26, and prevent the fan blade 20 from warping, deforming or even breaking under the combined action of negative pressure and centrifugal force. In particular, it can strengthen the parts where airflow impact is concentrated, such as the leading edge 22 and the outer edge 23 of the blade, to ensure the structural stability of the fan blade 20 during long-term high-speed operation.

[0053] In some embodiments, the fan blade 20 includes a first connecting portion 27 and a second connecting portion 28. The first connecting portion 27 is connected to the main body 10 through the second connecting portion 28. The reinforcing structure 40 includes a first reinforcing rib 41 located at the first connecting portion 27; and / or, the reinforcing structure 40 includes a second reinforcing rib 42 located at the connection area between the first connecting portion 27 and the second connecting portion 28. Through the arrangement of the first reinforcing rib 41 and / or the second reinforcing rib 42, with the first reinforcing rib 41 located at the first connecting portion 27 and the second reinforcing rib 42 located at the connection area between the first connecting portion 27 and the second connecting portion 28, the first reinforcing rib 41 and the second reinforcing rib 42 can effectively enhance the structural strength of the corresponding area. Simultaneously, if deformation occurs in the connection area during fan blade 20 operation, the overall profile of the fan blade 20 will deviate from the designed curved surface, disrupting the aerodynamic balance between the pressure surface 25 and the suction surface 26, resulting in airflow separation and thrust loss. The first reinforcing rib 41 and the second reinforcing rib 42 suppress deformation of the connecting area, ensuring that the fan blade 20 always maintains the optimal aerodynamic profile, so that the pressure surface 25 and the suction surface 26 can stably form an effective pressure difference, allowing more rotational energy to be converted into the power to drive the airflow. The stable shape of the fan blade 20 can avoid airflow turbulence caused by deformation, ensuring that the airflow flows smoothly along the surface of the fan blade 20 and is output efficiently, effectively increasing the air volume per unit time.

[0054] It should be noted that the first connecting part 27 and the second connecting part 28 are integrally formed structures.

[0055] In some embodiments, when the reinforcing structure 40 includes a first reinforcing rib 41, a plurality of first reinforcing ribs 41 are provided, and the plurality of first reinforcing ribs 41 are spaced apart from the outer edge 23 of the blade to the inner edge 21 of the blade, and the plurality of first reinforcing ribs 41 extend from the trailing edge 24 of the blade to the leading edge 22 of the blade.

[0056] By distributing multiple first reinforcing ribs 41 at intervals from the outer edge 23 to the inner edge 21 of the blade and extending from the trailing edge 24 to the leading edge 22, the centrifugal force and airflow impact load during the high-speed rotation of the wind turbine 20 are effectively and evenly transferred to the entire blade. This avoids stress concentration in weak areas such as the outer edge 23 and the trailing edge 24, effectively resisting blade warping and deformation, and improving the vibration resistance of the wind turbine 20. Simultaneously, the extending direction of the first reinforcing ribs 41 is consistent with the mainstream airflow direction during the rotation of the wind turbine 20. The spaced ribs can divide the airflow on the suction surface 26 into multiple finer airflow streams, reducing boundary layer separation caused by excessively high airflow velocity.

[0057] In some embodiments, the reinforcing structure 40 includes multiple second reinforcing ribs 42, which are spaced apart from the trailing edge 24 to the leading edge 22. The end of each second reinforcing rib 42 furthest from the main body 10 is inclined in the opposite direction to the rotation direction of the blade 20. By spaced apart multiple second reinforcing ribs 42 from the trailing edge 24 to the leading edge 22, the localized stress in the connection area is effectively distributed to multiple load-bearing points, preventing cracking or loosening due to torque overload in the connection area. This ensures efficient power transmission from the main body 10 to the blade 20, providing structural protection for the continuous and stable thrust output of the blade 20. Simultaneously, the inclined orientation of the end of the second reinforcing rib 42 furthest from the main body 10 in the opposite direction to the rotation direction of the blade 20 effectively avoids vertical obstruction of airflow, reducing localized wind resistance caused by airflow impact.

[0058] Furthermore, the first reinforcing rib 41 and the second reinforcing rib 42 are arc-shaped reinforcing ribs. Optionally, multiple first reinforcing ribs 41 have the same circular shape.

[0059] In some embodiments, the first connecting portion 27 has a concave surface 271 and a convex surface 272, which are disposed opposite to each other. The concave surface 271 is recessed within the pressure surface 25 of the fan blade 20, and the convex surface 272 protrudes outward from the suction surface 26 of the fan blade 20. Through the cooperative use of the concave surface 271 and the convex surface 272, the concave surface 271 is recessed within the pressure surface 25 of the fan blade 20, and the convex surface 272 protrudes outward from the suction surface 26 of the fan blade 20, effectively forming an area on the fan blade 20 that can converge and guide the airflow, allowing the airflow to flow more smoothly along the surface.

[0060] In some embodiments, the main body 10 is provided with a mounting protrusion 11 on one side of the suction surface 26 of the fan blade 20. The mounting protrusion 11 has a mounting hole 12 that penetrates both the main body 10 and the mounting protrusion 11. Multiple third reinforcing ribs 13 are spaced apart around the periphery of the mounting protrusion 11. Through the cooperative use of the mounting protrusion 11 and the mounting hole 12, the mounting protrusion 11, positioned on one side of the main body 10 on the suction surface 26 of the fan blade 20, and the mounting hole 12 penetrating both the mounting protrusion 11 and the main body 10, effectively provides a mounting base for the connection between the fan blade structure 100 and the drive shaft of the drive component. By providing multiple third reinforcing ribs 13 spaced apart around the periphery of the mounting protrusion 11, the connection strength between the mounting protrusion 11 and the main body 10 is effectively enhanced, preventing breakage of the mounting protrusion 11 during operation of the fan blade structure 100.

[0061] In some embodiments, the main body 10 is provided with a plurality of second grooves 14 on one side of the suction surface 26 of the fan blade 20. The plurality of second grooves 14 are arranged around the mounting protrusion 11, and each second groove 14 is located between two adjacent third reinforcing ribs 13. By providing the second grooves 14, which are located on one side of the main body 10 on the suction surface 26 of the fan blade 20, the structural strength of the main body 10 is effectively enhanced, the weight of the fan blade structure 100 is reduced, and the coaxiality of the fan blade structure 100 can be adjusted by filling the second grooves 14 with glue.

[0062] It should be noted that the main body 10, the fan blade 20, the reinforcing structure 40, the mounting protrusion 11, and the third reinforcing rib 13 are integrally formed structures.

[0063] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A fan blade structure, characterized in that: The device includes a main body (10) and fan blades (20). Multiple fan blades (20) are provided, and the multiple fan blades (20) are arranged at intervals around the main body (10). The outline edge of each fan blade (20) includes an inner edge (21), a leading edge (22), an outer edge (23), and a trailing edge (24) connected end to end in sequence. Each fan blade (20) is connected to the main body (10) through the inner edge (21). Each trailing edge (24) of each fan blade (20) is connected to a guide portion (30). The guide portion (30) bends toward the pressure surface (25) of the fan blade (20). The guide portion (30) is provided with multiple first grooves (31). Each first groove (31) extends from the trailing edge (24) toward the leading edge (22). The multiple first grooves (31) are arranged from the outer edge (23) toward the inner edge (21).

2. The fan blade structure as described in claim 1, characterized in that: Multiple first grooves (31) are disposed on the suction surface (26) of the fan blade (20); Alternatively, from the outer edge (23) of the blade to the inner edge (21) of the blade, the guide portion (30) has a plurality of alternating peaks (32) and troughs (33), and from the pressure surface (25) of the fan blade (20) to the suction surface (26) of the fan blade (20), the troughs (33) protrude from the peaks (32), and the troughs (33) form the first groove (31).

3. The fan blade structure as described in claim 2, characterized in that: The thickness of the guide section (30) at the trough (33) is greater than the thickness of the guide section (30) at the crest (32); And / or, from the leading edge (22) of the leaf to the trailing edge (24) of the leaf, the depth of each of the first grooves (31) gradually decreases and increases.

4. The fan blade structure as described in claim 1, characterized in that: The thickness of the guide portion (30) near the outer edge (23) of the blade is less than the thickness of the guide portion (30) near the inner edge (21) of the blade; And / or, the thickness of the end of the guide portion (30) away from the blade trailing edge (24) is less than the thickness of the end of the guide portion (30) near the blade trailing edge (24); And / or, the length of the end of the guide portion (30) near the outer edge (23) of the blade is greater than the length of the end of the guide portion (30) near the inner edge (21) of the blade.

5. The fan blade structure as described in claim 1, characterized in that: The suction surface (26) of the fan blade (20) is provided with a reinforcing structure (40).

6. The fan blade structure as described in claim 5, characterized in that: The fan blade (20) includes a first connecting part (27) and a second connecting part (28). The first connecting part (27) is connected to the main body (10) through the second connecting part (28). The reinforcing structure (40) includes a first reinforcing rib (41). The first reinforcing rib (41) is located at the first connecting part (27). And / or, the reinforcing structure (40) includes a second reinforcing rib (42) located in the connection area between the first connecting portion (27) and the second connecting portion (28).

7. The fan blade structure as described in claim 6, characterized in that: When the reinforcing structure (40) includes a first reinforcing rib (41), there are multiple first reinforcing ribs (41), and the multiple first reinforcing ribs (41) are spaced apart from the outer edge (23) of the leaf to the inner edge (21) of the leaf, and the multiple first reinforcing ribs (41) all extend from the trailing edge (24) of the leaf to the leading edge (22) of the leaf; When the reinforcing structure (40) includes a second reinforcing rib (42), a plurality of the second reinforcing ribs (42) are provided, the plurality of the second reinforcing ribs (42) are spaced apart from the trailing edge (24) of the blade to the leading edge (22) of the blade, and each second reinforcing rib (42) is inclined in the opposite direction to the rotation direction of the blade (20) at one end away from the main body (10).

8. The fan blade structure as described in claim 6, characterized in that: The first connecting part (27) has a concave surface (271) and a convex surface (272). The concave surface (271) and the convex surface (272) are arranged opposite to each other. The concave surface (271) is recessed into the pressure surface (25) of the fan blade (20), and the convex surface (272) protrudes outward from the suction surface (26) of the fan blade (20).

9. The fan blade structure as described in any one of claims 1 to 8, characterized in that: The main body (10) is provided with a mounting protrusion (11) on one side of the suction surface (26) of the fan blade (20). The mounting protrusion (11) is provided with a mounting hole (12), which penetrates the main body (10) and the mounting protrusion (11). Multiple third reinforcing ribs (13) are provided at intervals around the mounting protrusion (11).

10. The fan blade structure as described in claim 9, characterized in that: The main body (10) is provided with a plurality of second grooves (14) on one side of the suction surface (26) of the fan blade (20). The plurality of second grooves (14) are arranged around the mounting protrusion (11), and each second groove (14) is located between two adjacent third reinforcing ribs (13).

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