A fan leaf

Abstract

The utility model relates to fan technical field, concretely relates to a fan blade, including detachable connection's blade body and blade extension part, wherein, the blade body and blade extension part between be provided with guiding connection mechanism and locking connection structure, locking connection structure makes blade extension part and blade body gradually tight connection in the process that blade extension part is relatively blade body and slides along the radial direction to the outside, the fan blade in the application has realized the quick, accurate positioning dismounting in the radial direction of fan blade, this design not only is convenient for daily cleaning and maintenance, can also reduce the packing transportation cost of fan obviously. After installation, the trend and slackening of blade extension part moving towards the direction of fan blade root are avoided, so that blade extension part and blade body keep firm, reliable, non-loose connection, avoid the power efficiency decline, vibration noise even the safety accident of fan blade structure because of vibration caused by connection failure.

Description

Technical Field

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

[0002] As the core component of a fan, the fan blade's structural design directly affects the fan's efficiency, noise, strength, and ease of maintenance. Currently, most fan blades and extension sections are integrally molded or fixedly connected. When a part is damaged, the entire blade must be replaced, resulting in high maintenance costs. Furthermore, since small-sized fan blades generally have a limited airflow range, increasing the rotation speed, while expanding the range of turbulent airflow, significantly increases noise and vibration. Increasing the fan blade size is an effective way to improve airflow and coverage; however, considering that lengthening the overall fan blade would increase the product packaging size, raising packaging and transportation costs, this becomes a significant limiting factor.

[0003] Some fan blade designs on the market use bolts or clips for detachable connections. However, due to the lack of effective guidance, alignment during assembly is difficult, resulting in low efficiency and difficulty in maintaining dynamic balance. Especially at high speeds, they struggle to resist strong centrifugal forces, causing the connections to loosen and fail, leading to noise, vibration, and even safety hazards. Therefore, they suffer from unreliable connections and inconvenient assembly.

[0004] In view of the above-mentioned technical problems, this utility model is proposed in this study. Utility Model Content

[0005] The technical problem this utility model aims to solve is to provide a fan blade, including a detachably connected blade body and a blade extension. A guide connection mechanism and a locking connection structure are provided between the blade body and the blade extension. The locking connection structure gradually tightens the blade extension and blade body as the blade extension slides radially outward relative to the blade body. This application achieves rapid and precise positioning and disassembly of the fan blade in the radial direction. This design not only facilitates daily cleaning and maintenance but also significantly reduces the packaging and transportation costs of the fan. After installation, it prevents the blade extension from moving towards the fan blade root and loosening, ensuring a firm, reliable, and secure connection between the blade extension and the blade body. This avoids fan blade structural vibration, noise, and even safety accidents such as detachment caused by fan blade structural vibration due to connection failure.

[0006] To solve the above-mentioned technical problems, this utility model proposes a fan blade, including a blade body and a blade extension. The root of the blade body is fixedly connected to the fan rotor, and the outer end of the blade body is detachably connected to the connecting end of the blade extension. A guide connection mechanism and a locking connection structure are provided between the blade body and the blade extension. The guide connection mechanism is used to guide the blade extension to slide relative to the blade body along the direction of the fan blade. The locking connection structure causes the blade extension and the blade body to gradually tighten and connect during the radial outward sliding of the blade extension relative to the blade body.

[0007] As described above, the guide connection mechanism includes a groove formed by recesses on the outer end surface of the blade body, and side baffles on both sides of the groove edge. The locking connection structure includes a wedge block in the groove. The connecting end of the blade extension is provided with an insertion part, which is positioned on one side opposite to the groove surface. The middle of the insertion part is provided with a slot that locks with the wedge block. The two sides of the insertion part are guided and slidably engaged with the side baffles. The two sides of the wedge block are locked and connected with the slot to restrict the blade extension from loosening relative to the blade body.

[0008] As described above, in one type of fan blade, the cross-section of the wedge block gradually increases from the front end to the rear end, and the cross-sectional shape of the slot matches the wedge block and also gradually increases from the front end to the rear end. The wedge block is inserted from the rear end of the slot and slides outward along the slot to achieve locking.

[0009] As described above, the insertion part has a first insertion block and a second insertion block protruding on both sides of the slot. The first insertion block and the second insertion block are matched with the side near the side baffle to form a guide part. The two sides of the side baffle are obliquely inwardly formed with guide grooves. The outer walls of the first insertion block and the second insertion block are guided and slidably engaged with the guide grooves to restrict the blade extension from loosening relative to the blade body in the vertical direction.

[0010] As described above, in one type of fan blade, the two side walls of the slot are obliquely inwardly formed with locking grooves, and the two sides of the wedge block are correspondingly matched with locking parts. The wedge block and the slot can be guided to slide together, and the locking groove and the locking part are locked together to restrict the blade extension from loosening relative to the blade body in the radial direction along the root.

[0011] As described above, a first slot and a second slot are formed between the wedge block and the side baffle. The first slot and the second slot correspond and match with the first insert block and the second insert block. An avoidance groove is provided on the blade body located at the front end of the wedge block, and the avoidance groove communicates with the first slot and the second slot.

[0012] As described above, in one type of fan blade, the groove gradually decreases in size from the front end to the rear end, and the size of the clearance groove is adapted to the size of the first insertion block and the second insertion block, so that the insertion part is placed in the clearance groove and slides in the groove.

[0013] As described above, the top surfaces of the two side baffles are flush with the surfaces corresponding to the blade body and are integrally connected to the blade body.

[0014] As described above, a limiting boss is provided on the outer edge of the groove. The limiting boss is located at the rear end of the groove and is spaced apart from the first and second insert blocks to form a gap.

[0015] As described above, in one type of fan blade, the wedge block is disposed on the upper surface of the blade body, the insertion part is disposed on the lower surface of the blade extension part, and the blade body at the outer end is locked to the blade extension part by the wedge block and the insertion part.

[0016] Compared with the prior art, the fan blade of this utility model has the following advantages:

[0017] 1. In this application, the fan blades achieve rapid and precise positioning and disassembly in the radial direction through the cooperation of the guide connection mechanism and the locking connection structure. This design not only facilitates daily cleaning and maintenance but also significantly reduces the packaging and transportation costs of the fan. After installation, it prevents the blade extension from moving towards the blade root and loosening, ensuring a firm, reliable, and secure connection between the blade extension and the blade body. This avoids safety accidents such as fan blade vibration, noise, or even detachment caused by fan blade vibration due to connection failure.

[0018] 2. In this application, a clearance groove is provided on the blade body to provide sliding space for the first and second insert blocks of the blade extension, thereby avoiding interference with other areas of the blade body 1. The insertion part cooperates with the clearance groove so that it can be smoothly guided and slid along the outer end of the fan blade or the root direction of the blade body, which facilitates the assembly and disassembly of the blade extension.

[0019] 3. After the fan blades are assembled in this application, the two side walls of the snap-fit ​​groove are tightly fitted to the two sides of the snap-fit ​​part, which effectively restricts the movement or shaking of the wedge block relative to the fan blade in the left and right directions, prevents it from swaying or misaligning, and at the same time prevents the wedge block from coming out of the snap-fit ​​groove in the vertical direction, so that it cannot directly exit upward or downward, thus having the functions of vertical limiting and preventing it from coming out. Attached Figure Description

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is one of the structural schematic diagrams of the fan blade in this utility model;

[0022] Figure 2 This is the second schematic diagram of the fan blade structure in this utility model;

[0023] Figure 3 This utility model is in Figure 2 A magnified view of part A in the diagram;

[0024] Figure 4 This is one of the structural cross-sectional schematic diagrams of the fan blade in this utility model;

[0025] Figure 5 The second sectional view of the fan blade structure in this utility model;

[0026] Figure 6 This utility model is in Figure 5 A magnified view of part B in the diagram;

[0027] Figure 8 This is the third sectional view of the fan blade structure in this utility model;

[0028] Figure 7 This is the fourth sectional view of the fan blade structure in this utility model;

[0029] Figure 9 This is a schematic diagram of the blade body in this utility model;

[0030] Figure 10 This is a schematic diagram of the blade extension section in this utility model.

[0031] In the picture:

[0032] 1. Blade body; 10. Guide connection mechanism; 11. Groove; 101. Wedge block; 1011. Snap-fit ​​part; 101a. Left side wall; 101b. Right side wall; 102. Side stop bar; 1021. Guide groove; 103. Clearance groove; 104. First slot; 105. Second slot; 106. Limiting boss;

[0033] 2. Blade extension section; 20. Locking connection structure; 21. Insertion section; 201. First insertion block; 201a. First inner wall surface; 201b. First outer wall surface; 202. Second insertion block; 2021. Guide section; 202a. Second inner wall surface; 202b. Second outer wall surface; 203. Slot; 2031. Snap-fit ​​slot. Detailed Implementation

[0034] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. In this embodiment, the radial direction of the fan blade is defined as the direction from the root of the fan blade to the outer end of the fan blade, based on the rotation center of the fan blade itself (which is usually coincident with the overall rotation axis of the fan).

[0035] like Figures 1 to 10 As shown, this utility model discloses a fan blade, including a blade body 1 and a blade extension 2. The root of the blade body 1 is fixedly connected to the fan rotor. The outer end of the blade body 1 is detachably connected to the connecting end of the blade extension 2. A guide connection mechanism 10 and a locking connection structure 20 are provided between the blade body 1 and the blade extension 2. The guide connection mechanism 10 is used to guide the blade extension 2 to slide relative to the blade body 1 along the direction of the fan blade. The locking connection structure 20 causes the blade extension 2 to gradually tighten and connect with the blade body 1 during the radial outward sliding of the blade extension 2 relative to the blade body 1.

[0036] In this embodiment, the fan blades are easy and quick to assemble and disassemble without the need for additional components. The fan blades can be assembled and disassembled simply by applying a certain force to the blade extension 2 along the radial direction of the fan blade. When installing the blade extension 2, first, the blade extension 2 is overlapped on the corresponding position of the blade body 1. Then, the blade extension 2 is slidably engaged with the guide connection mechanism 10, so that it is guided to slide along the outer end of the blade body 1. Subsequently, it gradually expands and tightens in cooperation with the locking connection structure 20 to achieve a locking connection between the blade extension 2 and the blade body 1.

[0037] When disassembling the blade extension 2, the blade body 1 remains stationary. The blade extension 2 is held and pushed against the blade extension 2 along the root direction of the blade body 1 with a large force. This breaks through the interaction force of the tension connection between the two, causing the blade extension 2 to slide in the opposite direction of the guide lock to release the locking connection between the two, thereby achieving the disassembly of the blade extension 2.

[0038] During fan operation, the fan blades rotate at high speed driven by the fan rotor. At this time, the blade extension 2 is subjected to significant centrifugal force, causing it to continuously move radially towards the outer end of the fan. In the locked connection state, the connection between the two is strengthened, thus preventing the blade extension 2 from loosening along the fan blade root direction. This effectively resists centrifugal force, ensuring a stable and reliable connection. In this application, the cooperation of the guide connection mechanism 10 and the locking connection structure 20 enables rapid and precise positioning and disassembly of the fan blades in the radial direction, facilitating daily cleaning and maintenance. After installation, the tendency of the blade extension 2 to move towards the fan blade root and loosening is prevented, ensuring a firm, reliable, and secure connection between the blade extension 2 and the blade body 1. This avoids fan blade structural vibration, noise, and even safety accidents such as detachment caused by fan blade structural vibration due to connection failure.

[0039] The extended and detachable fan blades agitate and drive the airflow in the surrounding area covered by the fan blades, increasing the fan's air volume and solving the problems of inconvenient assembly and inaccurate positioning during use. At the same time, it significantly reduces packaging and transportation costs.

[0040] like Figures 1 to 10 As shown, as a further technical solution of this application, the guide connection mechanism 10 includes a groove 11 formed by recessing on the surface of the outer end of the blade body 1, and side baffles 102 on both sides of the edge of the groove 11. The locking connection structure 20 includes a wedge block 101 in the groove 11. The connecting end of the blade extension 2 is provided with a plug-in part 21, and the plug-in part 21 is provided on one side opposite to the surface of the groove 11. The middle part of the plug-in part 21 is provided with a slot 203 that locks and engages with the wedge block 101. The two sides of the plug-in part 21 are guided and slidably engaged with the side baffles 102, and the two sides of the wedge block 101 are locked and engaged with the slot 203 to restrict the blade extension 2 from loosening relative to the blade body 1. The structure is simple and reliable, and easy to assemble and disassemble.

[0041] In this application, the blade extension 2 can be locked and connected with the corresponding lower surface of the blade body 1 via its upper surface, or the corresponding upper surface of the blade extension 2 can be locked and connected with the corresponding upper surface of the blade body 1. In this embodiment, preferably, the wedge block 101 is provided on the upper surface of the blade body 1, and the insertion part 21 is provided on the lower surface of the blade extension 2. The blade body 1 at its outer end is locked and connected to the blade extension 2 via the wedge block 101 and the insertion part 21, which has the beneficial effect of limiting relative loosening between the blade extension 2 and the blade body 1 and ensuring a firm and reliable connection.

[0042] Preferably, refer to Figures 1 to 10 At least one wedge block 101 is provided, and at least one first insert block 201 and a second insert block 202 are provided to lock and engage with the wedge block 101 to ensure the connection strength and stability of the fan blade. In specific implementation, the number of wedge blocks 101 is increased according to the key dimensions of the fan blade, and the number of corresponding insert blocks will also increase, which can increase the overall connection strength of the fan blade.

[0043] like Figures 1 to 10As a further technical solution of this application, the two side walls of the slot 203 are obliquely inwardly formed with engagement grooves 2031, and the two sides of the wedge block 101 are correspondingly matched with engagement portions 1011. The wedge block 101 and the slot 203 are guided to slide together, and the engagement grooves 2031 and engagement portions 1011 are locked together to restrict the blade extension portion 2 from loosening relative to the blade body 1 in the radial direction along the root. The engagement groove 2031 forms a groove-shaped structure, and the engagement portions 1011 and the wedge block 101 have corresponding flange structures, which constitute a mechanical interlocking structure to ensure that the fan blade is firmly connected. The obliquely inwardly extended engagement groove 2031 provides a guide slope during the insertion of the wedge block 101 into the slot 203. The engagement portions 1011 on both sides of the wedge block 101 slide along this slope, thereby guiding the wedge block 101 into the final position of the engagement groove 2031. This ensures that the wedge block 101 can be guided and slid accurately and smoothly.

[0044] After the fan blades are assembled, the locking part 1011 locks into the locking groove 2031. The two side walls of the locking groove 2031 fit tightly against the two sides of the locking part 1011, effectively restricting the movement or wobbling of the wedge block 101 relative to the fan blades in the left and right directions, preventing it from swaying or misaligning. At the same time, the locking part 1011 is "hooked" or "locked" inside the locking groove 2031, preventing the wedge block 101 from coming out of the groove 2031 in the vertical direction, thus preventing it from exiting directly upwards or downwards. Therefore, it has the functions of vertical limiting and preventing dislodgement.

[0045] In this embodiment, the included angle between the inclined surface and the lower surface of the connecting end of the blade extension 2 is an acute angle.

[0046] Specifically, refer to Figures 3 to 10 The two side walls of the wedge block 101 are respectively designated as the left side wall 101a and the right side wall 101b, the two side walls of the first insert block 201 are respectively designated as the first inner side wall 201a and the first outer side wall 201b, and the two side walls of the second insert block 202 are respectively designated as the second inner side wall 202a and the second outer side wall 202b. When the blade extension 2 is in the locked state, the first inner side wall 201a of the first insert block 201 is fitted and locked with the left side wall 101a of the wedge block 101, and the second inner side wall 202a of the second insert block 202 is fitted and locked with the right side wall 101b of the wedge block 101.

[0047] like Figures 2 to 10As shown, in this embodiment, the insertion portion 21 has a first insertion block 201 and a second insertion block 202 protruding on both sides of the slot 203. The first insertion block 201 and the second insertion block 202 are correspondingly matched with the side near the side stop 102 to form a guide portion 2021. The two sides of the side stop 102 are obliquely inwardly formed with guide grooves 1021. The outer walls of the first insertion block 201 and the second insertion block 202 are guided and slidably engaged with the guide grooves 1021 to restrict the blade extension portion 2 from loosening relative to the blade body 1 in the vertical direction. Similarly, the guide portion 2021 forms a flange structure, and the guide groove 1021 has a corresponding groove structure. The guide portions 2021 of the first insertion block 201 and the corresponding guide grooves 1021 of the second insertion block 202 form an interlocking structure. In this application, by adding a side baffle 102 in cooperation with the first insert 201 and the second insert 202, the displacement of the blade extension 2 in the vertical direction can be restricted, preventing it from swaying or misaligning, thus enhancing the overall stability of the fan blade operation and avoiding mechanical vibration. At the same time, it provides a guiding function, making the disassembly and assembly process more stable and faster.

[0048] like Figures 2 to 10 As shown, as a further technical solution of this application, a first slot 104 and a second slot 105 are formed between the wedge block 101 and the side stop strip 102. The first slot 104 and the second slot 105 correspond and match with the first insert block 201 and the second insert block 202. An avoidance groove 103 is provided on the blade body 1 located at the front end of the wedge block 101, and the avoidance groove 103 communicates with the first slot 104 and the second slot 105. The three together form a groove 11. Further, the groove 11 gradually decreases in size from the front end to the rear end. The size of the avoidance groove 103 is adapted to the size of the first insert block 201 and the second insert block 202, so that the insertion part 21 is placed in the avoidance groove 103 and slides in the groove 11. The insertion part 21 of the blade extension 2 is placed in the avoidance groove 103 and slides toward the rear end of the groove 11. The avoidance groove 103 provides sliding space for the first insert block 201 and the second insert block 202 of the blade extension 2, thereby avoiding interference with other areas of the blade body 1. The insertion part 21 of the blade extension 2 is placed in the clearance groove 103. It engages with the first insertion block 201 and the second insertion block 202 via the wedge block 101, allowing the first insertion block 201 and the second insertion block 202 to smoothly slide into the first slot 104 and the second slot 105 along the radial direction of the outer end of the blade. This ensures smooth guiding, sliding, and locking connections, facilitating installation. During disassembly, the blade extension 2 is held and slid towards the blade root, causing the first insertion block 201 and the second insertion block 202 to exit the groove 11 through the clearance groove 103.

[0049] To avoid a significant increase in the thickness of the fan blades in certain areas, which could disrupt airflow and reduce fan efficiency, this application provides a groove 11 at the outer end of the blade body 1. After the blade body 1 and the blade extension 2 are locked together, the total thickness at the connection point is less than the thickness of the two layers of blades directly superimposed. This helps the airflow to run more smoothly, thereby improving the fan's operating efficiency, reducing resistance, and obtaining a larger air volume under the same operating power.

[0050] like Figures 2 to 10 As shown, as a further technical solution of this application, the cross-section of the wedge block 101 gradually increases from the front end to the rear end. The cross-sectional shape of the slot 203 matches that of the wedge block 101 and also gradually increases from the front end to the rear end. The wedge block 101 is inserted from the rear end of the slot 203 and slides outward along the slot 203 to achieve locking. Furthermore, the cross-section of the wedge block 101 is trapezoidal, and the cross-section of the slot 203 is a corresponding trapezoid. When the fan blade rotates, the centrifugal force throws the blade extension 2 outward, causing a radial interlocking effect between the wedge block 101 and the slot 203. The stronger the contact connection between the two, the more it resists vibration and relative loosening, ensuring the overall structural strength of the fan blade.

[0051] In this application, the front ends of both the guide connection mechanism 10 and the locking connection structure 20 are close to the root of the fan blade, and their rear ends are close to the outer end of the fan blade.

[0052] In this embodiment, the top surface of the two side baffles 102 is flush with the surface corresponding to the blade body 1 and is integrally connected with the blade body 1, which helps to reduce the thickness at the blade connection end, reduce wind resistance, and obtain a larger air volume under the same working power.

[0053] Furthermore, such as Figures 1 to 10 As shown, the edges of the two side walls of the wedge block 101 are chamfered. This design makes the stress load on the edge of the wedge block 101 more uniform, ensuring the overall structural strength of the fan blade.

[0054] Reference Figures 2 to 10As a further technical solution of this application, a limiting boss 106 is provided at the outer edge of the blade body 1. The limiting boss 106 is located at the rear end of the groove 11, and is spaced apart from the first insert 201 and the second insert 202, forming a gap. This gap is used to reserve radial allowance to accommodate thermal or dynamic deformation of the blade material. For example, in a cold environment, the dimensions of the first insert 201 and the second insert 202 may shrink slightly. The locking fit between the two and the wedge block 101 can be compensated for the radial allowance required for the locking connection through this gap. The three interact to prevent the blade extension 2 from loosening relative to the blade body 1, so that the blade body 1 and the blade extension 2 always maintain a tight connection. In addition, the limiting boss 106 and the side baffle 102 work together to strengthen the overall structural strength of the connection. It should be noted that the limiting boss 106 does not interfere with the blade extension 2.

[0055] Furthermore, the aforementioned fan blades can be made of thin plastic or carbon fiber, offering the advantage of being lightweight.

Claims

1. A fan blade, comprising a blade body (1) and a blade extension (2), wherein the root of the blade body (1) is fixedly connected to a fan rotor, and the outer end of the blade body (1) is detachably connected to the connecting end of the blade extension (2), characterized in that... A guide connection mechanism (10) and a locking connection structure (20) are provided between the blade body (1) and the blade extension (2). The guide connection mechanism (10) is used to guide the blade extension (2) to slide relative to the blade body (1) along the direction of the fan blade. The locking connection structure (20) causes the blade extension (2) to gradually tighten and connect with the blade body (1) during the process of the blade extension (2) sliding radially outward relative to the blade body (1).

2. A fan blade according to claim 1, characterized in that... The guide connection mechanism (10) includes a groove (11) formed by recessing the outer end of the blade body (1) and side bars (102) on both sides of the edge of the groove (11). The locking connection structure (20) includes a wedge block (101) in the groove (11). The connecting end of the blade extension (2) is provided with a plug (21), and the plug (21) is provided on one side of the surface of the groove (11). The middle part of the plug (21) is provided with a slot (203) that locks with the wedge block (101). The two sides of the plug (21) are guided and slidably engaged with the side bars (102). The two sides of the wedge block (101) are locked and connected with the slot (203) to restrict the blade extension (2) from loosening relative to the blade body (1).

3. A fan blade according to claim 2, characterized in that... The cross-section of the wedge block (101) gradually increases from the front end to the rear end. The cross-sectional shape of the slot (203) matches that of the wedge block (101) and also gradually increases from the front end to the rear end. The wedge block (101) is inserted from the rear end of the slot (203) and slides outward along the slot (203) to achieve locking.

4. A fan blade according to claim 3, characterized in that... The insertion part (21) has a first insertion block (201) and a second insertion block (202) protruding on both sides of the slot (203). The first insertion block (201) and the second insertion block (202) are matched with the side near the side bar (102) to form a guide part (2021). The two sides of the side bar (102) are obliquely inwardly formed with guide grooves (1021). The outer walls of the first insertion block (201) and the second insertion block (202) are guided and slidably engaged with the guide grooves (1021) to restrict the blade extension part (2) from loosening relative to the blade body (1) in the vertical direction.

5. A fan blade according to claim 3, characterized in that... The two side walls of the slot (203) are obliquely inwardly formed with snap-fit ​​grooves (2031), and the two sides of the wedge block (101) are correspondingly matched with snap-fit ​​parts (1011). The wedge block (101) and the slot (203) can be guided to slide together, and the snap-fit ​​grooves (2031) and snap-fit ​​parts (1011) are locked together to restrict the blade extension part (2) from loosening relative to the blade body (1) in the radial direction along the root.

6. A fan blade according to claim 2, characterized in that... A first slot (104) and a second slot (105) are formed between the wedge block (101) and the side baffle (102). The first slot (104) and the second slot (105) correspond to and match the first insert block (201) and the second insert block (202). A clearance groove (103) is provided on the blade body (1) located at the front end of the wedge block (101), and the clearance groove (103) communicates with the first slot (104) and the second slot (105).

7. A fan blade according to claim 6, characterized in that... The groove (11) gradually decreases in size from the front end to the rear end, and the size of the clearance groove (103) is adapted to the size of the first insert (201) and the second insert (202).

8. A fan blade according to claim 6, characterized in that... The top surfaces of the two side baffles (102) are flush with the corresponding surfaces of the blade body (1) and are integrally connected with the blade body (1).

9. A fan blade according to any one of claims 4 to 8, characterized in that... The outer edge of the groove (11) is provided with a limiting boss (106). The limiting boss (106) is located at the rear end of the groove (11). The limiting boss (106) is spaced apart from the first insert (201) and the second insert (202) and forms a gap.

10. A fan blade according to any one of claims 2 to 8, characterized in that... The wedge block (101) is located on the upper surface of the blade body (1), and the insertion part (21) is located on the lower surface of the blade extension part (2). The blade body (1) is locked to the blade extension part (21) at its outer end through the wedge block (101) and the insertion part (21).

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