Fan blades and axial fan

Abstract

The utility model relates to a fan blade and axial flow fan, fan blade includes hub and several blades, several blades are surrounded on the hub, and the blade includes the blade root connected with the hub, the outer edge opposite the blade root, the front edge between the blade root and the outer edge, the trailing edge opposite the front edge, the blade still includes the front end area at the front edge and the outer edge junction, and the rear end area at the trailing edge and the outer edge junction, and the connecting piece is established between two adjacent blades, and the connecting piece extends from the front end area of one of two adjacent blades to the rear end area of another. Utilize the connecting piece to improve the rigidity and dynamic balance of the blade, reduce the vibration noise of the blade.

Description

Technical Field

[0001] This utility model relates to the field of fans, and in particular to a fan blade and an axial flow fan. Background Technology

[0002] Fans are widely used in various scenarios such as heat dissipation and air supply, for example, to cool electronic devices. Axial fans are particularly common, as they can quickly dissipate heat generated by heat sources such as processors and batteries within electronic devices, preventing overheating from affecting the performance of the devices. The core components of existing axial fans include a drive motor, a hub, and blades. The drive motor drives the hub, which in turn drives the blades to rotate, thus creating airflow that passes over the aforementioned heat sources for cooling. While existing fans have various structures and functions—for example, Reference 1 shows a relatively complete structure and basic operating principle of an axial fan with a corresponding hub, blades, and fan body; References 2, 3, and 5 all mention setting corresponding ring (or ring) structures on the outer periphery of the blades to improve their stability and rigidity; Reference 3 also mentions adding anti-cut plates; and Reference 4 mentions adding pressure-boosting blades with an additional tilt angle between the blades to achieve pressure boosting.

[0003] Reference 1: CN221120440U Reference 2: CN115605687A Reference 3: CN222910344U Reference 4: CN220581337U Reference 5: JP2011-513618A Utility Model Content This utility model provides a fan blade and an axial flow fan.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A first aspect of this utility model provides a fan blade, including a hub and a plurality of blades, the plurality of blades surrounding the hub. Each blade includes a blade root connected to the hub, an outer edge opposite to the blade root, a leading edge located between the blade root and the outer edge, and a trailing edge opposite to the leading edge. The junction of the leading edge and the outer edge is the front end region of the blade, and the junction of the trailing edge and the outer edge is the rear end region of the blade. A connecting piece is provided between each pair of adjacent blades, and the connecting piece extends from the front end region of one pair of adjacent blades to the rear end region of the other pair.

[0005] In this invention, a connecting piece connects the front or rear end regions of two adjacent blades, thus unifying the root sides of all blades to the hub. Simultaneously, all blades are sequentially connected together through the aforementioned front and rear end regions. Compared to existing solutions, under the same conditions, the rigidity of the fan blades in this invention is significantly improved, noticeably reducing blade vibration and noise, and enhancing the dynamic balance of fan blade rotation. Furthermore, compared to existing technologies that directly incorporate corresponding ring or loop structures on the outer periphery of the blades (such as those in references 2, 3, and 5), the connecting piece in this invention only connects the front or rear end regions without forming a complete ring or loop structure. This connection structure between the connecting piece and the front or rear end regions better "holds" the airflow, significantly increasing the airflow through the blade's airflow channel, thereby increasing the air volume. Therefore, in practical applications, this significantly improves the performance of the blades and the fan, for example, significantly increasing the cooling effect. While existing ring or loop structures can improve rigidity, they only simply separate the airflow inside and outside the ring or loop, failing to increase the airflow through the blade's airflow channel.

[0006] It should be noted that the basic structure and principle of the fan blades in this utility model are existing technologies. For example, the fan blades are composed of a hub (also called a wheel hub or other names) connected to several blades. The basic structure, shape, size, material of the hub and blades, as well as the size, connection, matching, and manufacturing process of each part, are all common knowledge in the field. Moreover, some of the related technical content is also reflected in the prior art (such as in references 1-5). They are not the innovation points of this utility model and will not be described further here. In addition, regarding the technical points of the fan blades and axial flow fans mentioned in this utility model, unless specifically mentioned in this utility model, the rest can be implemented by referring to the prior art.

[0007] Optionally, the connecting piece extends from the outer edge of one of two adjacent blades to the outer edge of the other. By connecting the connecting piece to the front and rear end regions and extending it from the outer edges of two adjacent blades, the connecting piece can be positioned as close as possible to the far or outer end of the blade. The connection structure formed between the connecting piece and the blade can "catch" the airflow as much as possible, further increasing the air volume. It is worth mentioning that the connecting piece should not significantly extend beyond the outer edge of the blade in the radial direction. If it does, it will increase the rotational resistance of the fan blades and increase the instability of the airflow.

[0008] Optionally, the outer surface of the connecting piece is flush with the outer edges of the two connected blades. By connecting the connecting piece to the front and rear end regions, and ensuring the outer surface of the connecting piece is flush with the outer edges of the two adjacent blades, the connecting piece can be positioned as close as possible to the far or outer end of the blade. The connection structure formed between the connecting piece and the blade can effectively "catch" the airflow, increasing the air volume. Furthermore, since the connecting piece does not extend beyond the outer edge of the blade in the radial direction, it also ensures airflow stability as much as possible.

[0009] Optionally, the outer surface of the connecting piece smoothly transitions to the outer edges of the two connected blades at the connection point. Based on the connection of the connecting piece to the front and rear regions, making the outer surface of the connecting piece smoothly transition to the outer edges of the two adjacent blades at the connection point allows the connecting piece to be as close as possible to the far end or outer end of the blade. The connection structure formed between the connecting piece and the blade can "catch" the airflow as much as possible, increasing the air volume. Furthermore, the smooth transition of the connecting piece to the outer edge of the blade in the radial direction can ensure airflow stability as much as possible. The smooth transition mentioned here means that there is no significant dimensional difference between the connecting piece and the outer edge of the blade at the point of contact, but it is not strictly necessary for the outer surface of the connecting piece and the outer edge to be completely identical in size. Moreover, a smooth transition structure is easier to achieve in the fan blade manufacturing process. For example, in the injection molding process of fan blades, it is easy to form a smooth transition structure between the connecting piece and the outer edge of the blade.

[0010] Optionally, the leading edge of the blade is positioned above the trailing edge of the same blade. According to the working principle of a fan blade, the fan blade has a certain curved shape to facilitate smooth rotation, creating a pressure difference and generating directional airflow. The leading edge being positioned above allows for a downward directional airflow when the blade rotates forward, thus supplying air to the underside of the fan blade, for example, to cool electronic devices located under the fan blade. In this invention, unless otherwise specified, as long as the connection between the connecting piece and the front and rear end regions of the blade is achieved, it is acceptable; furthermore, there is no need to strictly limit the specific height difference between the leading and trailing edges of the blade, or the specific shape and size of the blade.

[0011] Optionally, the connecting piece extends from the front end region of one blade to the rear end region of the adjacent blade on the front side. Of course, from a practical standpoint, extending the connecting piece from the front end region of one blade to the rear end region of the adjacent blade on the rear side is also possible, but this would significantly increase the size of each connecting piece, increasing overall weight and manufacturing difficulty without a significant performance improvement. Therefore, in practice, the preferred solution is that the connecting piece extends from the front end region of one blade to the rear end region of the adjacent blade on the front side.

[0012] Optionally, the plurality of blades are evenly spaced around the hub, and the number of connecting plates is the same as the number of blades. All blades and connecting plates have the same shape and size. This improves the dynamic balance of the entire fan blades and the consistency of airflow. Of course, this improved solution is also applicable to solutions where the blade spacing is uneven, and / or there are certain differences in the shape and size of the blades, and / or there are certain differences in the shape and size of the connecting plates.

[0013] Optionally, the inner surface of the connecting piece includes a guide surface that extends rearward from the front edge of the connecting piece and gradually extends towards the axis of the hub. The guide surface's gradual thickening structure makes the connecting piece structure more mechanically sound during rotation, significantly reducing rotational resistance.

[0014] Optionally, the guide surface occupies 15%-30% of the entire inner surface. Setting the proportion of the guide surface within a certain range can reduce rotational resistance while minimizing the impact on the effect of "catching" the airflow.

[0015] Optionally, the guide surface occupies 20%-25% of the entire inner surface. Setting the guide surface proportion within this preferred range can better achieve the smoothness of the guide surface to significantly reduce resistance, and can also maximize the "holding" of airflow to increase airflow rate.

[0016] Optionally, the guide surface and the extension surface located behind the guide surface of the inner surface have a smooth transition. This allows for smoother airflow, improves dynamic balance, and also facilitates manufacturing.

[0017] Optionally, the bottom surface of the blade is provided with at least one protrusion, which extends forward from the trailing edge. The protrusion on the bottom surface of the blade is positioned precisely on the airflow channel. Because a connecting piece is used in this invention to form a connecting structure, the airflow rate can be significantly increased. Compared to existing technologies, this significantly increases the airflow rate per unit airflow channel, making it easier for unstable airflow to be generated during fan blade operation. The protrusion can interfere with and regulate the unstable airflow at higher velocities, resulting in a larger airflow while maintaining stability, further improving the dynamic balance effect. Therefore, the connecting piece and the protrusion have a synergistic effect, achieving both increased fan airflow and relatively stable operation.

[0018] Optionally, the protrusion gradually decreases in size from the rear edge forward, which makes the protrusion more in line with mechanical principles and can reduce wind resistance while managing unstable airflow.

[0019] Optionally, the number of blades and connecting pieces is 5-11. The number of blades affects the connection angle and density of the connecting pieces. Preferably, the number of blades is 5-11. Too few blades will increase the volume of the connecting pieces, leading to increased resistance and affecting airflow. Too many blades will result in excessively high blade and connecting piece density, making the airflow channel too small and affecting airflow and stability. Since the number of blades and the adjustment of their size and shape are conventional techniques in the art, they will not be elaborated upon here.

[0020] Optionally, the number of blades and connecting pieces is nine. This configuration, with nine blades and nine connecting pieces, achieves the best balance, significantly increasing airflow while maintaining excellent stability, and is therefore a preferred option.

[0021] The second aspect of this utility model provides an axial flow fan, including the fan blades described in any of the first aspects. As analyzed above, in this utility model, apart from the innovation of the fan blades in the first aspect, other components of the axial flow fan (e.g., the fan body) can refer to the prior art. For example, the drive motor, frame, and electronic control components are not innovative parts of this utility model and will not be described in detail here.

[0022] In addition, it should be noted that the fan blades in this utility model are not only applicable to axial fans, but also to other types of fans such as oblique flow fans with similar air intake directions to axial fans.

[0023] Effects of the utility model In this invention, the parts of the fan blades that are prone to swaying and vibration during operation are connected by a connecting piece to the corresponding front and rear areas of two adjacent blades. This improves the rigidity and dynamic balance of the blades, reducing blade vibration and noise. The connecting piece of this invention can better "hold" the airflow, helping to increase air volume and improve heat dissipation.

[0024] In addition, by setting protrusions on the bottom surface of the blades, this utility model can sort out the airflow with a large velocity formed by the connecting piece, so that the air volume is larger and the stability is higher, further improving the dynamic balance effect. 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 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 a schematic diagram of the fan blade structure in some embodiments of the present invention.

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the fan blades from another perspective.

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0029] Figure 4 This is a schematic diagram of the fan blade structure in some embodiments of the present invention. Figure 1 The reverse side of the fan blades.

[0030] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0031] Figure 6 for Figure 4 A schematic diagram of the structure of the fan blades from another perspective.

[0032] Figure 7 for Figure 6 Enlarged view of point C.

[0033] Figure 8 for Figure 1 A side view of the fan blades when they are placed vertically.

[0034] Figure 9 This is a schematic diagram of the structure of an axial flow fan with a fan body in some embodiments of the present invention.

[0035] Figure 10 for Figure 9 A schematic diagram of the reverse structure of a central axial flow fan.

[0036] Explanation of reference numerals in the attached figures: 10. Hub, 20. Blade, 201. Front end area, 202. Rear end area, 203. Airflow channel, 21. Blade root, 22. Outer edge, 23. Leading edge, 24. Trailing edge, 25. Top surface of blade, 26. Bottom surface of blade, 27. Negative pressure groove, 28. Protrusion, 30. Connecting piece, 31. Leading edge, 32. Rear edge, 33. Inner side, 331. Guide surface, 332. Extension surface, 34. Outer side, 35. Rear guide surface, 40. Fan body. Detailed Implementation

[0037] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this utility model pertains.

[0038] In the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this utility model.

[0039] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly indicate the inclusion of at least one of that feature. In the description of this utility model, "a number of" means at least two, such as two, three, etc.

[0040] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between 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.

[0041] Example 1 Figure 1 and Figure 2 The structural diagrams of the fan blades are shown from different angles.

[0042] See Figure 1 Embodiment 1 provides a fan blade, including a hub 10 and a plurality of blades 20. The plurality of blades 20 surround the hub 10. Each blade 20 includes a blade root 21 connected to the hub 10, an outer edge 22 opposite to the blade root 21, a leading edge 23 located between the blade root 21 and the outer edge 22, and a trailing edge 24 opposite to the leading edge 23. The blade 20 also includes a front end region 201 located at the junction of the leading edge 23 and the outer edge 22, and a rear end region 202 located at the junction of the trailing edge 24 and the outer edge 22. A connecting piece 30 is provided between each two adjacent blades 20, and the connecting piece 30 extends from the front end region 201 of one of the two adjacent blades 20 to the rear end region 202 of the other.

[0043] refer to Figure 1 Regarding the direction markings, in this embodiment of the invention, "front" and "rear" are determined according to the order in which the blade 20 comes into contact with the air during its rotation. For example, "leading edge 23" refers to the edge of the blade 20 that first contacts or cuts the air during rotation, and "rear edge 24" refers to the edge of the blade 20 that last leaves or releases the air during rotation.

[0044] "Inner" refers to the side that is roughly facing the hub 10, while "outer" refers to the side that is roughly away from the hub 10.

[0045] "Up" and "down" are roughly parallel to the axis O of hub 10. Figure 8 The two directions are opposite to each other. An airflow channel 203 is formed between two adjacent blades 20.

[0046] The areas near the outer edge 22, such as the front end area 201 and the rear end area 202, are areas and parts where the blades 20 are prone to swaying and vibration during fan operation. By using a connecting piece 30 to connect the front end area 201 and the rear end area 202 of adjacent blades 20, all blades 20 become a single unit, improving the rigidity and dynamic balance of the blades 20 and reducing vibration noise. The connection structure between the connecting piece 30 and the front end area 201 or the rear end area 202 in this embodiment of the invention can better "hold" the airflow, helping to increase air volume and improve heat dissipation.

[0047] See Figure 1 , Figure 2 In some embodiments, the connecting piece 30 extends from the outer edge 22 of the front end region 201 of one of two adjacent blades 20 to the outer edge 22 of the rear end region 202 of the other. This reduces the uneven transition between the connecting piece 30 and the outer edges 22 of the two connected blades 20, allowing airflow to pass through the connecting piece 30 more smoothly and stably. Furthermore, by placing the connecting piece 30 as close as possible to the far end or outer end of the blade 20, the connection structure formed by the connecting piece 30 and the front end region 201 or rear end region 202 can "catch" the airflow as much as possible, further increasing the air volume.

[0048] Figure 7 for Figure 6 A magnified view of C. (See image below.) Figure 7 As shown, in some embodiments, the outer surface 34 of the connecting piece 30 is flush with the outer edges 22 of the two connected blades 20. For example, it can be understood that the connection between the outer surface 34 and the corresponding outer edge 22 is on the same plane or curved surface.

[0049] Of course, in some embodiments, emphasis is placed on the smooth transition between the outer surface 34 and the outer edges 22 of the two connected blades 20. That is, even if the outer surface 34 and the blades 20 are not exactly the same in size and shape, they can still smoothly transition at the connection point, so that the airflow can still pass more smoothly on the outer surface 34 of the connecting piece 30.

[0050] In addition, such as Figure 3 , Figure 5 , Figure 7 As illustrated, as a simple implementation, the connecting piece 30 can be roughly elongated, and its precise shape and size are not strictly limited. For example, the connecting piece 30 can be a cuboid or similar sheet, as long as it can achieve the aforementioned connection with the area corresponding to the blade 20. Those skilled in the art can make necessary adjustments to the size and shape of the connecting piece 30 based on experience or manufacturing processes. Unless otherwise explicitly defined in this invention, there is no need to further strictly limit the shape and size of the connecting piece 30.

[0051] See Figure 3 In some embodiments, the inner surface 33 of the connecting piece 30 includes a guide surface 331 that extends rearward from the front edge 31 of the connecting piece 30 and gradually extends toward the axis of the hub 10. The guide surface 331 transitions smoothly with the extension surface 332 located behind the guide surface 331 in the inner surface 33.

[0052] The inner surface 33 of the connecting piece 30 does not necessarily need to be flat. The guide surface 331 makes the leading edge 31 "sharper" and "thinner", which makes it easier for the connecting piece 30 to "cut" into the air, reduce resistance, and guide the airflow to smoothly transition into the airflow channel 203 between two adjacent blades 20. This not only helps with air intake and increases air volume, but also helps reduce wind resistance.

[0053] Figure 3 The middle arrow points to the approximate direction of airflow.

[0054] Figure 3 In the implementation shown, the guide surface 331 is a roughly inclined plane. In other implementations, the guide surface 331 can also be a curved surface or other types of surfaces.

[0055] The guide surface 331 occupies 15%-30% of the entire inner surface 33. Alternatively, the guide surface 331 occupies 20%-25% of the entire inner surface 33. Within these ranges, the guide surface 331 allows the connecting piece 30 to maintain a relatively thin profile while ensuring its function of guiding and concentrating airflow.

[0056] For example, the guide surface 331 occupies 15%, 18%, 20%, 22%, 23%, 24% or 25% of the entire inner surface 33.

[0057] See Figure 3 The inner surface 33 also includes an extension surface 332 located behind the guide surface 331.

[0058] In some embodiments, the guide surface 331 and the extension surface 332 have a smooth transition. This reduces the resistance of airflow over the inner surface 33 of the connecting piece 30, allowing the airflow to flow more smoothly over the inner surface 33.

[0059] See Figure 7 The connecting piece 30 may also include a rear guide surface 35 disposed behind the outer side surface 34. The rear guide surface 35 extends from the outer side surface 34 to the rear edge 32 of the connecting piece 30. The rear guide surface 35 may, for example, be configured with the same shape and size proportions as the guide surface 331, and may also improve the smoothness of airflow to a certain extent.

[0060] See Figures 4 to 7 In some embodiments, the bottom surface 26 of the blade is provided with at least one protrusion 28, for example... Figure 4 As shown, there may be two protrusions 28 evenly distributed along the trailing edge 24. The protrusions 28 extend from the trailing edge 24 to the front edge 23, and the protrusions 28 gradually decrease in size from the trailing edge 24 to the front edge 23. During the operation of the fan blades, although the airflow (i.e., air volume) increases after the connecting piece 30 is set, the disturbance caused by the large airflow is also large, which will affect the dynamic balance of the fan blades. In this embodiment of the present invention, by setting the protrusions 28 on the bottom surface 26 of the blades, the airflow can be disturbed and sorted, further improving the dynamic balance effect. That is to say, under the synergistic effect of the connecting piece 30 and the protrusions 28, the goal of larger airflow and higher stability is achieved.

[0061] In the embodiment illustrated in this utility model, the bottom surface 26 of each blade is provided with two protrusions 28. The number of protrusions 28 may also be one, three or more. The number of protrusions 28 is not a limitation of this utility model. When the number of protrusions 28 is at least two, the at least two protrusions 28 are arranged side by side along the extending direction of the blade 20.

[0062] See Figure 1 and Figure 2In some alternative embodiments, the top surface 25 of the blade is provided with at least one negative pressure groove 27, which extends from the trailing edge 24 to the front edge 23, and the width of the negative pressure groove 27 gradually decreases from the trailing edge 24 to the front edge 23.

[0063] The negative pressure groove 27 can suppress the separation of airflow from the blade 20, allowing the airflow to flow more smoothly and stably over the blade 20, delaying stall, thereby stabilizing the airflow and reducing noise.

[0064] In the embodiment illustrated in this utility model, the top surface 25 of the blade is provided with three negative pressure grooves 27. The number of negative pressure grooves 27 can also be one, two, four or more. The number of negative pressure grooves 27 is not a limitation of this utility model. When the number of negative pressure grooves 27 is at least two, at least two negative pressure grooves 27 are arranged side by side along the extension direction of the blade 20.

[0065] Compared to the negative pressure groove 27, the front end of the protrusion 28 is farther from the leading edge 23.

[0066] See Figure 1 In some embodiments, the leading edge 23 of the blade 20 is positioned above the trailing edge 24 of the same blade 20. Figure 1 In this design, the blade 20 is bent and twisted forward, which can be referred to as a forward-swept fan blade. Both the leading edge 23 and the trailing edge 24 of the blade 20 can be curved.

[0067] See Figure 1 The connecting piece 30 extends from the front end region 201 of one blade 20 to the rear end region 202 of another adjacent blade 20. Several blades 20 are evenly spaced around the hub 10. The number of connecting pieces 30 is the same as the number of blades 20. All blades 20 have the same shape and size, and all connecting pieces 30 have the same shape and size.

[0068] Of the plurality of blades 20 distributed around the hub 10, each blade 20 has two adjacent blades 20 in front and behind. In a preferred embodiment of the present invention, see [reference needed]. Figure 1 The connecting piece 30 extends from the front end region 201 of one blade 20 to the rear end region 202 of the adjacent blade 20 on the front side. This connecting piece 30 has a short extension length, which causes less resistance to airflow.

[0069] Several blades 20 are evenly spaced around the hub 10.

[0070] In some embodiments, the number of blades 20 and connecting pieces 30 is 5 to 11. The number of blades 20 is equal to the number of connecting pieces 30. For example, the number of blades 20 and connecting pieces 30 is 5, or the number of blades 20 and connecting pieces 30 is 6, 7, 8, 9, 10 or 11.

[0071] This utility model 1 to Figure 8 In the preferred embodiment shown, there are nine blades 20 and nine connecting pieces 30.

[0072] exist Figure 8 In the implementation shown, the connecting pieces 30 are arranged at approximately an inclination, and the inclination angle of each connecting piece 30 is approximately equal. The inclination angle of the connecting piece 30 relative to the vertical direction (the vertical direction is parallel to the axis of the hub 10) is related to the number of blades 20, and the inclination angle of the connecting piece 30 is not intended to limit the present invention.

[0073] The connecting piece 30 and the blade 20 can be an integral structure. For example, the connecting piece 30 and the blade 20 can be manufactured as a single piece by means of injection molding, CNC machining, etc.

[0074] Example 2 Example 2 provides an axial flow fan, see [link to example]. Figure 9 and Figure 10 The axial flow fan includes the fan blades described in Example 1.

[0075] The upper part of the axial fan is the air intake side, and the lower part of the axial fan is the air outlet side.

[0076] See Figure 9 and Figure 10 Axial fans generally also include a fan body 40, and a hub 10 can be connected to the fan body 40. The fan body 40 can be used to fix the axial fan in electronic devices and other scenarios.

[0077] In some embodiments, the axial fan also includes a motor that drives the blades to rotate relative to the fan body 40 via the hub 10.

[0078] The fan blades of this utility model embodiment can also be used in oblique flow fans, etc.

[0079] The electronic devices in this utility model embodiment include, but are not limited to, desktop computers, laptops, workstations, mobile phones, televisions, wearable devices, and in-vehicle electronic products.

[0080] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0081] In the description of this specification, references to "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fan blade, comprising a hub (10) and a plurality of blades (20), the plurality of blades (20) surrounding the hub (10), each blade (20) comprising a blade root (21) connected to the hub (10), an outer edge (22) opposite to the blade root (21), a leading edge (23) located between the blade root (21) and the outer edge (22), and a trailing edge (24) opposite to the leading edge (23), wherein the junction of the leading edge (23) and the outer edge (22) is the front end region (201) of the blade (20), and the junction of the trailing edge (24) and the outer edge (22) is the rear end region (202) of the blade (20), characterized in that, A connecting piece (30) is provided between each of two adjacent blades (20), and the connecting piece (30) extends from the front end region (201) of one of the two adjacent blades (20) to the rear end region (202) of the other.

2. The fan blade according to claim 1, characterized in that, The connecting piece (30) extends from the outer edge (22) of one of the two adjacent blades (20) to the outer edge (22) of the other.

3. The fan blade according to claim 1, characterized in that, The outer surface (34) of the connecting piece (30) is flush with the outer edge (22) of the two blades (20) to which it is connected.

4. The fan blade according to claim 1, characterized in that, The outer surface (34) of the connecting piece (30) and the outer edge (22) of the two connected blades (20) transition smoothly at the connection point.

5. The fan blade according to claim 1, characterized in that, The leading edge (23) of the blade (20) is on the upper side relative to the trailing edge (24) of the same blade (20), and the connecting piece (30) extends from the front end region (201) of one blade (20) to the rear end region (202) of another blade (20) adjacent to it on the front side.

6. The fan blade according to claim 1, characterized in that, The plurality of blades (20) are evenly spaced around the hub (10), the number of connecting pieces (30) is the same as the number of blades (20), all the blades (20) have the same shape and size, and all the connecting pieces (30) have the same shape and size.

7. The fan blade according to any one of claims 1 to 3, characterized in that, The inner side (33) of the connecting piece (30) includes a guide surface (331) that extends rearward from the front edge (31) of the connecting piece (30) and gradually extends toward the axis of the hub (10).

8. The fan blade according to claim 7, characterized in that, The guide surface (331) occupies 15%-30% of the entire inner surface (33).

9. The fan blade according to claim 7, characterized in that, The guide surface (331) occupies 20%-25% of the entire inner surface (33).

10. The fan blade according to claim 7, characterized in that, The guide surface (331) and the extension surface (332) located behind the guide surface (331) in the inner side surface (33) have a smooth transition.

11. The fan blade according to any one of claims 1 to 3, characterized in that, The bottom surface (26) of the blade is provided with a protrusion (28), the protrusion (28) extends forward from the trailing edge (24), and the protrusion (28) gradually decreases forward from the trailing edge (24).

12. The fan blade according to claim 1, characterized in that, The number of blades (20) and connecting pieces (30) is 5-11 each.

13. The fan blade according to claim 1, characterized in that, The number of blades (20) and connecting pieces (30) is 9 each.

14. An axial flow fan, characterized in that, Includes the fan blades as described in any one of claims 1-13.

Images