Split fan blade

Abstract

The utility model discloses a split fan blade, including upper fan hub, lower fan hub and a plurality of leaf that are clamped between the two, and the root of every leaf is equipped with the installation part, and the installation part includes the radial board that sets up along the radial direction and the lateral board that sets up along the axial direction, the radial board is clamped between upper fan hub and lower fan hub, and the lateral board is pasted on the lateral wall of upper fan hub, the upper fan hub, lower fan hub and leaf three between being equipped with fastening structure, the first circumferential limiting structure is established between the leaf and upper fan hub, and the second circumferential limiting structure is established between upper fan hub and lower fan hub. The utility model has the advantages of being convenient to disassemble and assemble, facilitating packaging, transportation and maintenance, and ensuring that the connecting structure is simple, reliable, stable and safe.

Description

Technical Field

[0001] This utility model relates to the field of fan blade technology, and in particular to a split-type fan blade. Background Technology

[0002] Traditional fan blades are mostly manufactured using a one-piece structure, where the fan hub and multiple blades are molded together or permanently fixed together. The problem with this one-piece fan blade design lies in packaging and transportation: due to the large overall size and irregular shape of the fan blade, more packaging materials are consumed, resulting in bulky packaging and significantly increasing warehousing and logistics costs. Furthermore, during transportation, the protruding blades are more susceptible to damage from external impacts. In addition, if a blade in a one-piece fan blade is accidentally damaged, the entire fan blade assembly often needs to be replaced, causing unnecessary waste and high maintenance costs.

[0003] Some split-blade fan designs have also appeared on the market. However, existing split-blade fan designs still face many challenges in practical applications:

[0004] Firstly, the complexity of the assembly and disassembly structure. Some split-type fan blades employ relatively cumbersome connection mechanisms, requiring various specialized tools for assembly and disassembly, or containing numerous small parts. This makes the installation and disassembly process time-consuming and laborious, demanding a high level of user skill and reducing ease of use. This complexity may also lead to incorrect assembly or omissions by users when disassembling and reassembling themselves, affecting the normal operation of the fan blades.

[0005] Secondly, the connection structure lacks stability. Fan blades experience significant centrifugal force and aerodynamic loads during high-speed rotation. Some split-type fan blades fail to adequately consider these mechanical factors in their connection structure design, resulting in loose and insufficiently secure connections between the blades and the hub, or between different components of the hub. This can lead to the following problems: Vibration and noise: Loose connections can cause abnormal vibration and noise during operation, affecting user experience and equipment stability; Performance degradation: Unstable connections may cause unexpected changes in the blade angle of attack, reducing the fan's aerodynamic efficiency; Safety hazards: In extreme cases, loosely connected blades may even detach and fly off during high-speed rotation, posing a serious safety hazard; Poor durability: Unstable connection points are prone to wear or fatigue damage under long-term stress, shortening the fan blade's lifespan.

[0006] Therefore, it is necessary to further improve and perfect the existing technology to overcome these shortcomings, and this utility model is made based on this situation. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a split fan blade that can be easily disassembled for packaging, transportation and maintenance, while ensuring a simple and reliable connection structure and stable and safe operation.

[0008] This utility model is achieved through the following technical solution:

[0009] To solve the above-mentioned technical problems, this utility model provides a split fan blade, including an upper fan hub, a lower fan hub, and multiple blades sandwiched between the two. Each blade has a mounting part at its root. The mounting part includes a radially arranged radial plate and an axially arranged lateral plate. The radial plate is sandwiched between the upper fan hub and the lower fan hub, and the lateral plate is attached to the side wall of the upper fan hub. A fastening structure is provided between the upper fan hub, the lower fan hub, and the blades. A first circumferential limiting structure is provided between the blades and the upper fan hub, and a second circumferential limiting structure is provided between the upper fan hub and the lower fan hub.

[0010] To further address the technical problems to be solved by this utility model, this utility model provides a split-type fan blade in which the fastening structure includes a first stud on the upper fan hub, a second stud at the corresponding position on the lower fan hub, and fasteners for connecting the first stud and the second stud. The radial plate is provided with a first through hole for the second stud to pass through, and the end of the first stud is provided with a slot for the end of the second stud to be inserted.

[0011] In order to further solve the technical problem to be solved by this utility model, the present utility model provides a split fan blade in which the first circumferential limiting structure includes at least one second through hole provided on the radial plate and a plurality of positioning posts provided on the lower end face of the upper fan hub, wherein the positioning posts are inserted into the corresponding second through hole.

[0012] To further address the technical problems addressed by this invention, a split-type fan blade is provided in which the second circumferential limiting structure includes a plurality of limiting protrusions and limiting grooves. One of the limiting protrusions and the limiting grooves is disposed on the mating surface of the upper fan hub facing the lower fan hub, and the other is disposed on the mating surface of the lower fan hub facing the upper fan hub. The corresponding limiting protrusions and limiting grooves are interlocked to restrict the relative circumferential rotation of the upper and lower fan hubs.

[0013] In order to further solve the technical problems to be solved by this utility model, this utility model provides a split fan blade in which the upper fan hub is provided with an inverted conical central hole and the lower fan hub is provided with a conical central column, and the central column is inserted into the central hole.

[0014] In order to further solve the technical problems to be solved by this utility model, this utility model provides a split fan blade in which the conical central column is provided with a mounting hole for connecting with the motor output shaft.

[0015] To further address the technical problems addressed by this utility model, a split-type fan blade is provided in which a plurality of first reinforcing ribs are provided on the surface of the upper fan hub facing the lower fan hub; a plurality of second reinforcing ribs are provided on the surface of the lower fan hub facing the upper fan hub; the free end faces of the first reinforcing ribs and the free end faces of the second reinforcing ribs abut against each other, and the radial plate of each blade is clamped between the first reinforcing ribs and the second reinforcing ribs.

[0016] In order to further solve the technical problems to be solved by this utility model, this utility model provides a split fan blade in which each blade has the same structure and size.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This invention utilizes a unique blade mounting section comprising radial and lateral plates, combined with a first circumferential limiting structure (for locking the blade to the upper hub), a second circumferential limiting structure (for locking the upper and lower hubs), and a fastening structure, to construct a multi-dimensional stable connection system from the blade to the hub and then to the hub as a whole. This design offers significant advantages: First, it fundamentally solves the problems of loosening and excessive vibration in traditional split-type fan blades, ensuring safe and reliable operation; second, its clear structure and simple assembly / disassembly logic greatly improve installation convenience; and most importantly, the unique blade mounting section design allows the disassembled blades to be compactly stacked, significantly reducing packaging volume and thus substantially lowering storage and transportation costs. Attached Figure Description

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 This is an exploded view of the present invention;

[0022] Figure 3 This is a cross-sectional view of the present invention. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Please see Figures 1 to 3 This embodiment provides a split fan blade, which aims to solve the problems of fan blades in the prior art that are not easy to package and transport, are inconvenient to maintain, or have complex structures and unstable connections. In order to achieve a split fan blade that can be easily disassembled to facilitate packaging, transportation and maintenance, and can also ensure a simple and reliable connection structure and stable and safe operation.

[0025] like Figure 1 , Figure 2 As shown, the split-type fan blade mainly includes: an upper fan hub 1, a lower fan hub 2, and multiple blades 3 that can be detachably installed between the two. Typically, the number of blades 3 can be set to three, five, or more depending on the fan's specifications and performance requirements. In this embodiment, six blades 3 are used as an example for illustration, but this does not constitute a limitation on the number of blades.

[0026] For details, please refer to Figure 2 and Figure 3 Each blade 3 has a mounting portion at its root, which is key to achieving a secure connection between the blade 3 and the fan hub and facilitating easy assembly and disassembly. Specifically, the mounting portion includes a radial plate 31 arranged radially (i.e., in a direction that radiates outward from the center of the fan blade) and a lateral plate 32 arranged axially along the blade 3 (i.e., in a direction that is approximately parallel to the rotation axis of the fan blade).

[0027] In this embodiment, the side plate 32 is preferably an arc-shaped plate with a specific curvature, the curvature of which allows it to fit tightly against the outer peripheral sidewall of the upper fan hub 1, thereby providing a stable support surface. The main body of the blade 3 (i.e., the airfoil portion that generates airflow) is connected to the free end of the arc-shaped side plate 32. This design allows the force on the blade 3 to be effectively transmitted to the upper fan hub 1.

[0028] In the assembled state, the radial plates 31 of each blade 3 are firmly clamped between the upper hub 1 and the lower hub 2. At the same time, the lateral plates 32 of each blade 3 are attached to the outer side wall of the upper hub 1, further enhancing the stability of the blade 3 installation and the accuracy of its positioning.

[0029] To secure the upper hub 1, lower hub 2, and the radial plate 31 of the clamped blade 3 into a single unit, this invention also provides a reliable fastening structure. Furthermore, as... Figure 2 , Figure 3As shown, the fastening structure includes: a plurality of (e.g., six, corresponding to the number of blades or set according to strength requirements) first studs 11 evenly distributed circumferentially on the upper fan hub 1; correspondingly, second studs 21 are provided at corresponding positions on the lower fan hub 2; and fasteners (e.g., screws, not shown in the figure, but understood by those skilled in the art) for locking the first studs 11 and second studs 21 together. During assembly, each blade 3 has a first through hole 311 on its radial plate 31 for the corresponding second stud 21 to pass through. The end of the first stud 11 (usually the end away from the upper fan hub 1 body) has a slot 111 for the end of the corresponding second stud 21 to be inserted. This design provides initial alignment and guidance, making it easier for the second stud 21 to align with the first stud 11, and may also share some of the shear force, enhancing the connection strength. During assembly, after the second stud 21 passes through the first through hole 311 of the radial plate 31, its end is inserted into the slot 111 of the first stud 11. Then, the upper fan hub 1 and the lower fan hub 2 are pressed together by fasteners (such as screws tightened on the threaded section of the second stud 21 or the first stud 11), thereby tightly clamping the radial plate 31 in the middle.

[0030] To prevent the blade 3 from rotating circumferentially or loosening relative to the upper hub 1 during operation (especially during start-up, stop, or speed change), this embodiment provides a first circumferential limiting structure between the blade 3 and the upper hub 1. For example... Figure 2 As shown, the first circumferential limiting structure specifically includes: at least one (preferably two or more to enhance the limiting effect) second through hole 312 provided on the radial plate 31 of each blade 3; simultaneously, a plurality of positioning posts 12 are provided on the lower end face of the upper hub 1 (i.e., the surface facing the radial plate 31) at positions corresponding to the second through hole 312. During installation, the positioning posts 12 on the upper hub 1 are inserted into the corresponding second through hole 312 on the radial plate 31. This plug-in fit can effectively prevent the blade 3 from undergoing undesirable circumferential displacement around its own axis or relative to the upper hub 1, ensuring the stability of the blade's angle of attack.

[0031] Meanwhile, to ensure a stable circumferential relative position between the upper hub 1 and the lower hub 2, and to prevent relative torsion during fastening or blade operation, this embodiment also includes a second circumferential limiting structure. For example... Figure 1 and Figure 2As shown, the second circumferential limiting structure may include a plurality of limiting protrusions 22 and corresponding limiting grooves 13. Specifically, one of the limiting protrusions 22 and the limiting grooves 13 (e.g., the limiting groove 13) is disposed on the mating surface of the upper fan hub 1 facing the lower fan hub 2, while the other (e.g., the limiting protrusion 22) is disposed on the mating surface of the lower fan hub 2 facing the upper fan hub 1. When the upper fan hub 1 and the lower fan hub 2 are engaged, the corresponding limiting protrusions 22 and limiting grooves 13 interlock, thereby effectively limiting the relative circumferential rotation between the upper fan hub 1 and the lower fan hub 2, ensuring the integrity and torsional rigidity of the entire fan hub structure.

[0032] To ensure precise axial positioning and coaxiality of the upper fan hub 1 and the lower fan hub 2, in this embodiment, the upper fan hub 1 has an inverted conical center hole 14 at its center, while the lower fan hub 2 has a matching conical center post 23 at its center. During assembly, the conical center post 23 of the lower fan hub 2 is inserted into the inverted conical center hole 14 of the upper fan hub 1. This conical fit not only achieves precise axial alignment but also provides a certain self-locking effect during tightening, further enhancing the stability of the connection.

[0033] Furthermore, to facilitate the installation of the entire split fan blade onto a drive device such as a motor, the tapered central column 23 of the lower fan hub 2 is also provided with a mounting hole 231 for connecting to the motor output shaft. The inner wall of the mounting hole 231 can be machined to fit the shape of the motor shaft (such as a circular keyway, a D-type hole, or a threaded hole).

[0034] To further enhance the clamping force on the radial plate 31 of the blade 3 and improve the overall structural strength of the fan hub, this embodiment can also provide a reinforcing structure on the mating surface of the fan hub. Specifically, a plurality of first reinforcing ribs 15 can be evenly distributed radially or circumferentially on the surface of the upper fan hub 1 facing the lower fan hub 2; correspondingly, a plurality of second reinforcing ribs 24 are also provided on the surface of the lower fan hub 2 facing the upper fan hub 1. When the upper fan hub 1 and the lower fan hub 2 are fastened by the fastening structure, the free end face (lower end face) of the first reinforcing rib 15 and the free end face (upper end face) of the second reinforcing rib 24 can abut against each other, firmly clamping the radial plate 31 of each blade 3 between these first reinforcing ribs 15 and second reinforcing ribs 24. These reinforcing ribs not only disperse the clamping force but also increase the contact area, making the radial plate 31 more evenly stressed and less prone to deformation or loosening.

[0035] In this embodiment, preferably, the structure and size of each blade 3 are designed to be completely identical. The advantages of doing so are obvious: firstly, it enables the universality of molds, reducing production costs; secondly, when replacing damaged blades, there is no need to distinguish blades in specific locations, making maintenance more convenient.

[0036] One particularly noteworthy advantage is that, due to the specific design of the radial plate 31 and lateral plate 32 in the mounting portion of the blade 3 in this embodiment, especially the relatively straight radial plate 31 and the regular shape of the lateral plate 32, multiple blades 3 can be easily stacked or layered after being disassembled. For example, the radial plate 31 of one blade can be stacked on top of the radial plate 31 of another blade, or the lateral plates 32 can be stacked in a certain nesting manner. This design greatly reduces the space occupied during packaging, which is very beneficial for packaging, warehousing, and transportation, and significantly reduces related costs.

[0037] The assembly process of a split fan blade is roughly as follows:

[0038] Take several blades 3, align the second through hole 312 on their radial plate 31 with the positioning post 12 on the lower end face of the upper fan hub 1 and insert them, while making the side plate 32 of the blades 3 fit against the side wall of the upper fan hub 1.

[0039] Remove the lower fan hub 2 and align its center post 23 with the center hole 14 of the upper fan hub 1, while ensuring that the limiting protrusion 22 on it is aligned with the limiting groove 13 on the upper fan hub 1. Push the lower fan hub 2 upward so that the center post 23 is inserted into the center hole 14 and the limiting protrusion 22 is embedded in the limiting groove 13. At this time, the second stud 21 of the lower fan hub 2 should also pass through the first through hole 311 on the radial plate 31 of each blade 3 and have its end inserted into the slot 111 of the first stud 11 of the upper fan hub 1.

[0040] By tightening fasteners (such as screws) one by one onto the second stud 21 (or the first stud 11), the upper fan hub 1 and the lower fan hub 2 are securely fastened together, thereby reliably clamping the radial plates 31 of all the blades 3 in the middle.

[0041] The disassembly process is the reverse of the assembly process described above. The entire disassembly and assembly process is simple and quick, requiring no complicated tools, and can be completed by ordinary users.

[0042] In summary, the split-type fan blade of this embodiment, through its ingenious structural design, including a specific blade mounting structure, fastening structure, first circumferential limiting structure, and second circumferential limiting structure, not only achieves convenient assembly and disassembly of the fan blade, facilitating packaging, transportation, and subsequent maintenance, but also ensures the stability of the assembled structure and the reliability of operation, effectively overcoming the shortcomings of existing technologies. In particular, the stackable design of the blades further enhances its practical value.

[0043] It should be understood that the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model. For example, the type of fastener, the specific shape and number of the limiting protrusions and grooves, and the arrangement of the reinforcing ribs can all be modified or improved under the spirit and principles of this utility model.

Claims

1. A split-type fan blade, characterized in that: The device includes an upper hub (1), a lower hub (2), and multiple blades (3) sandwiched between the two. Each blade (3) has a mounting part at its root. The mounting part includes a radial plate (31) arranged radially and a lateral plate (32) arranged axially. The radial plate (31) is sandwiched between the upper hub (1) and the lower hub (2), and the lateral plate (32) is attached to the side wall of the upper hub (1). The upper hub (1), the lower hub (2), and the blades (3) are provided with a fastening structure. The blades (3) and the upper hub (1) are provided with a first circumferential limiting structure, and the upper hub (1) and the lower hub (2) are provided with a second circumferential limiting structure.

2. A split-type fan blade according to claim 1, characterized in that: The fastening structure includes a first stud (11) on the upper fan hub (1), a second stud (21) at the corresponding position on the lower fan hub (2), and fasteners for connecting the first stud (11) and the second stud (21). The radial plate (31) is provided with a first through hole (311) through which the second stud (21) passes, and the end of the first stud (11) is provided with a slot (111) for the end of the second stud (21) to be inserted.

3. A split-type fan blade according to claim 1, characterized in that: The first circumferential limiting structure includes at least one second through hole (312) on the radial plate (31) and a plurality of positioning posts (12) on the lower end face of the upper fan hub (1), wherein the positioning posts (12) are inserted into the corresponding second through hole (312).

4. A split-type fan blade according to claim 1, characterized in that: The second circumferential limiting structure includes several limiting protrusions (22) and limiting grooves (13). One of the limiting protrusions (22) and the limiting grooves (13) is provided on the mating surface of the upper fan hub (1) facing the lower fan hub (2), and the other is provided on the mating surface of the lower fan hub (2) facing the upper fan hub (1). The corresponding limiting protrusions (22) and limiting grooves (13) are interlocked to restrict the relative circumferential rotation of the upper fan hub (1) and the lower fan hub (2).

5. A split-type fan blade according to claim 1, characterized in that: The upper fan hub (1) has an inverted conical central hole (14) at its center, and the lower fan hub (2) has a conical central column (23) at its center, with the central column (23) inserted into the central hole (14).

6. A split-type fan blade according to claim 5, characterized in that: The tapered central column (23) is provided with a mounting hole (231) for connecting to the motor output shaft.

7. A split-type fan blade according to claim 1, characterized in that: The upper fan hub (1) has a plurality of first reinforcing ribs (15) on the surface facing the lower fan hub (2); the lower fan hub (2) has a plurality of second reinforcing ribs (24) on the surface facing the upper fan hub (1); the free end faces of the first reinforcing ribs (15) and the free end faces of the second reinforcing ribs (24) abut against each other, and the radial plate (31) of each blade (3) is clamped between the first reinforcing ribs (15) and the second reinforcing ribs (24).

8. A split-type fan blade according to claim 1, characterized in that: All blades (3) have the same structure and size.

Images