Fan blade outer rotor structure, processing and assembling method thereof and fan using same

Abstract

The application discloses a fan blade outer rotor structure, a processing and assembling method thereof and a fan using the same. The fan blade outer rotor structure comprises a fan blade with a containing cavity, a casing adapted to be integrally injection molded in the containing cavity to cooperate with the fan blade to form a circular containing cavity, and a magnetic ring adapted to be fixed in the circular containing cavity by colloid bonding. An annular engaging wall for fixing the magnetic ring is formed on the cavity wall of the circular containing cavity along the axial direction of the circular containing cavity. The annular engaging wall comprises a positioning portion for axially supporting the magnetic ring and a containing portion for containing the colloid. The containing portion is recessed relative to the positioning portion.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, and in particular to a wind turbine blade external rotor structure, its processing and assembly method, and a wind turbine using the same. Background Technology

[0002] In the prior art, the outer rotor structure of the fan blades in the fresh air fan needs to be firmly joined together with the housing and the magnetic ring. This can be achieved by integral injection molding, such as the rotor assembly, motor structure and fan disclosed in announcement number CN217469582U, which achieves the joining of the fixed parts and the permanent magnet by injection molding the rotor shaft, the permanent magnet and the fixed parts.

[0003] For the aforementioned publicly disclosed technology of the wind turbine, actual research has revealed that when the permanent magnet is made of injection-molded ferrite, there is a risk of detachment between the casing and the magnetic ring due to ferrite deformation during operation in high-temperature and high-humidity environments. This could lead to increased operating noise or even turbine failure. Using neodymium iron boron (NFeB) magnets could mitigate this risk, but the cost would be higher for wind turbines with the same performance. If rubber magnets are used, the size of the wind turbine structure would increase, further raising production costs.

[0004] Based on the above, the permanent magnet and the housing can be fixed by adhesive bonding. While ensuring the high efficiency of the fan, the housing and the magnetic ring can be fixed by adhesive bonding along the circumferential direction. However, actual research has found that the adhesive is easily extruded, so it needs to be cleaned. Cleaning the adhesive will increase the number of processes and may even cause the fan to fail due to residual adhesive. If the structure between the housing and the magnetic ring is designed with a certain thickness of adhesive bonding, it will reduce the performance of the motor and increase the cost due to the process.

[0005] Therefore, the connection method between the casing and the magnet of the fan blade outer rotor structure needs to be optimized to balance processing cost and simplify processing procedures. Summary of the Invention

[0006] The first objective of this invention is to provide a wind turbine external rotor structure to solve the technical problem of optimizing the connection method between the casing and the magnet.

[0007] The second objective of this invention is to provide a method for processing and assembling an external rotor structure for a wind turbine blade, in order to solve the technical problem of optimizing the joining method between the casing and the magnet.

[0008] A third objective of this invention is to provide a fan that addresses the technical problem of balancing cost reduction and process simplification.

[0009] The external rotor structure of the wind turbine blade of this invention is implemented as follows:

[0010] A wind turbine external rotor structure, comprising:

[0011] The fan blade has a housing cavity;

[0012] The housing is suitable for integral injection molding and fixing in the accommodating cavity to cooperate with the fan blades to form a circular receiving cavity;

[0013] A magnetic ring, suitable for fixing in a circular receiving cavity by adhesive bonding; wherein

[0014] The circular receiving cavity has an annular joint wall formed on its axial cavity wall for fixing the magnetic ring; and the annular joint wall includes a positioning part for providing axial support for the magnetic ring and a receiving part for accommodating the colloid; and the receiving part is recessed relative to the positioning part.

[0015] In an optional embodiment of the invention, the end face of the bottom of the circular receiving cavity corresponding to the housing has an annular wall; the annular wall is provided with at least one through groove that is hollowed out; and

[0016] At least one filling block suitable for one-to-one embedding in the through slot is formed on the bottom wall of the receiving cavity of the fan blade.

[0017] In an optional embodiment of the invention, the filler block is adapted to fill the radial surface of the through groove; and

[0018] When the filling block embedded in the through groove protrudes along the axial direction of the circular receiving cavity from the annular wall, the filling block forms the positioning part, and the annular wall forms the receiving part;

[0019] When the annular wall protrudes along the axial direction of the circular receiving cavity from the filling block embedded in the through groove, the positioning part is formed by the annular wall, and the receiving part is formed by the filling block.

[0020] In an optional embodiment of the present invention, at least two through slots are provided at intervals along the circumferential direction on the annular wall, and at least two filling blocks suitable for being embedded one-to-one in the at least two through slots are provided on the bottom wall of the receiving cavity of the fan blade.

[0021] In an optional embodiment of the invention, the positioning portion includes at least two protrusions formed by each filler block protruding from the annular wall in the embedded through groove; and

[0022] The receiving portion includes at least two grooves formed on the annular wall and located circumferentially between every two adjacent protrusions; and

[0023] At least two of the bumps have the same height relative to the groove protrusion; the radial dimension of each bump is not greater than the radial dimension of the annular joint wall.

[0024] In an optional embodiment of the present invention, a stop portion is further formed on the annular joint wall;

[0025] The stop portion includes multiple stop bars located in each groove and extending in the circumferential direction;

[0026] Each of the aforementioned retaining strips is raised relative to the groove; and

[0027] Each of the aforementioned baffles is located on one side of the groove facing the axis of the circular receiving cavity.

[0028] In an optional embodiment of the invention, the height of each of the baffles protruding relative to the groove is no greater than the height of any protrusion protruding relative to the groove; and

[0029] The length of each of the aforementioned baffles extending in the circumferential direction is less than or equal to the length of the groove extending in the circumferential direction.

[0030] In an optional embodiment of the present invention, a central angle β is formed between the protrusion on one side of each of the baffles along the circumferential direction and the protrusion on the same side of the baffle;

[0031] 0°≤β≤10°.

[0032] In an optional embodiment of the invention, the receiving portion includes at least two recesses formed by each filler block embedded in the through slot recessed into the annular wall; and

[0033] The positioning part includes all parts of the annular wall except for the groove.

[0034] In an optional embodiment of the invention, the radial dimension of the magnetic ring is larger than the radial dimension of the groove.

[0035] The machining and assembly method of the external rotor structure of the wind turbine blade of the present invention is implemented as follows:

[0036] A method for machining and assembling a wind turbine outer rotor structure, applicable to the aforementioned wind turbine outer rotor structure, includes:

[0037] Step S1: The housing and the fan blade are integrally injection molded to form a circular receiving cavity; and an annular joint wall is formed on the cavity wall along its axial direction; the annular joint wall includes a positioning part for axial support of the magnetic ring and a receiving part for accommodating the colloid.

[0038] Step S2: Calculate the volume of the receiving part to determine the amount of colloid to be used, and place the determined amount of colloid into the receiving part;

[0039] Step S3: Press the magnetic ring into the circular receiving cavity and fix it with adhesive.

[0040] The fan of this invention is implemented as follows:

[0041] A fan includes: the outer rotor structure of the fan blades.

[0042] By adopting the above technical solution, the present invention has the following beneficial effects: The fan blade outer rotor structure, its processing and assembly method, and the fan using the present invention, through the positioning part for axial support of the magnetic ring and the accommodating part for accommodating the colloid involved in the circular receiving cavity in the housing, can quantitatively obtain the volume of the colloid in the accommodating part. Thus, when the magnetic ring is fixed to the housing by adhesive bonding, the problem of colloid overflowing due to large quantity and needing to be cleaned is avoided. At the same time, the adhesive is formed on the axial side end of the magnetic ring and the housing, which can avoid the potential for noise or failure caused by the shrinkage of the outer circular wall of the magnetic ring in the circular receiving cavity of the housing under high temperature and high humidity. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the external rotor structure of the wind turbine of the present invention;

[0044] Figure 2 This is an exploded structural diagram of the external rotor structure of the wind turbine of the present invention;

[0045] Figure 3 This is a first-view structural schematic diagram of the external rotor structure of the wind turbine in Embodiment 3 of the present invention;

[0046] Figure 4 for Figure 3 Z-direction sectional view;

[0047] Figure 5 for Figure 4 Enlarged view of Part I;

[0048] Figure 6 This is a schematic diagram of the mating structure between the casing and the fan blade in Embodiment 3 of the present invention;

[0049] Figure 7 This is a schematic diagram of the magnetic ring structure of the outer rotor structure of the wind turbine of the present invention;

[0050] Figure 8 This is a schematic diagram of the overall and corresponding cross-sectional structure of the outer rotor structure of the fan blade in Embodiment 3 of the present invention;

[0051] Figure 9 This is a schematic diagram of the mating structure between the casing and the fan blade in Embodiment 4 of the present invention;

[0052] Figure 10 for Figure 9 Z1 sectional view;

[0053] Figure 11 for Figure 10 Enlarged view of Part I;

[0054] Figure 12 This is a schematic diagram of the overall and corresponding cross-sectional structure of the outer rotor structure of the fan blade in Embodiment 4 of the present invention;

[0055] Figure 13 This is a schematic diagram of the overall and corresponding cross-sectional structure of the casing of the fan blade outer rotor structure of Embodiment 4 of the present invention in another optional embodiment;

[0056] Figure 14 For the corresponding Figure 13 A cross-sectional view and partial schematic diagram of the casing and magnetic ring of the fan blade external rotor structure.

[0057] In the figure: fan blade 1, receiving cavity 11, filling block 12, housing 2, annular wall 21, through groove 211, columnar part 23, extension part 24, inclined transition 25, magnetic ring 3, rotating shaft 4, protrusion 51, groove 52, baffle 53, circular receiving cavity 6, annular joint wall 61, chamfer K. Detailed Implementation

[0058] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0059] Example 1:

[0060] Please see Figure 1 and Figure 2 As shown, this embodiment provides a fan blade external rotor structure, including: a fan blade 1, a housing 2, and a magnetic ring 3 for use. A rotating shaft 4 is also fixed at the axis of the fan blade 1. The specific shape of the fan blade 1 can be achieved using any mature method from the prior art; this embodiment does not impose an absolute limitation, as long as a receiving cavity 11 is formed at its axis to meet the requirements for fitting the housing 2. The housing 2 is used for fixed assembly into the receiving cavity 11. In one optional implementation, from the perspective of simplifying the manufacturing process, the housing 2 and the fan blade 1 are integrally injection molded.

[0061] Based on the above, in order to meet the assembly requirements of the magnetic ring 3, the housing 2 and the fan blade 1 cooperate to form a circular receiving cavity 6. In this structure, the magnetic ring 3 is suitable for being fixed in the circular receiving cavity 6 by adhesive bonding. In this regard, it should be further explained that, regarding the adhesive bonding between the housing 2 and the magnetic ring 3, an annular joint wall 61 for fixing the magnetic ring 3 is formed on the cavity wall along its axial direction in the circular receiving cavity 6; that is, the adhesive bonding between the magnetic ring 3 and the housing 2 is formed at the axial end of the magnetic ring 3 and the housing 2, which can avoid the potential for noise or failure caused by the shrinkage of the outer circular wall of the magnetic ring 3 in the circular receiving cavity 6 of the housing 2 under high temperature and high humidity.

[0062] More specifically, the annular joint wall 61 includes a positioning portion for providing axial support to the magnetic ring 3 and a receiving portion for accommodating the colloid; and the receiving portion is recessed relative to the positioning portion.

[0063] Regarding the aforementioned forming methods of the receiving and positioning portions, generally speaking, the end face of the housing 2 corresponding to the bottom of the circular receiving cavity 6 has an annular wall 21; at least one through groove 211 with a hollowed-out shape is provided on the annular wall 21; and at least one filling block 12 suitable for one-to-one embedding in the through groove 211 is formed on the bottom wall of the receiving cavity 11 of the fan blade 1. It should be noted that the annular wall 21 in this embodiment has a certain thickness to meet the matching requirements of the filling block 12 and the through groove 211, and considering the issue of ease of processing, it is preferable that the annular wall 21 has a structure with flat upper and lower surfaces and uniform thickness. Of course, the thickness of the annular wall 21 here does not need to be too large, and it is mainly determined by the amount of adhesive used to bond the housing 2 and the magnetic ring 3. The specific thickness of the annular wall 21 will be specifically described in the following embodiments.

[0064] In the case of integral injection molding of the housing 2 and the fan blade 1, the filler block 12 directly inserts into the through groove 211 during the injection molding process. It should be noted that the filler block 12 embedded in the through groove 211 is suitable to fill the radial surface of the through groove 211. In this case, the convexity or concavity of the filler block 12 embedded in the through groove 211 relative to the annular wall 21 along the axial direction of the circular receiving cavity 6 is used to determine whether the filler block 12 or the annular wall 21 forms the receiving portion. Specifically, when the filler block 12 embedded in the through groove 211 protrudes from the annular wall 21, the filler block 12 forms the positioning portion, and the annular wall 21 forms the receiving portion; when the annular wall 21 protrudes from the filler block 12 embedded in the through groove 211, the annular wall 21 forms the positioning portion, and the filler block 12 forms the receiving portion.

[0065] Regarding the fit between the magnetic ring 3 and the housing 2, the following design was also made in this embodiment:

[0066] In general, in one alternative implementation, the outer circular wall of the magnetic ring 3 is adapted to have an interference fit with the inner wall of the housing 2. For this purpose, a preload is designed between the magnetic ring 3 and the housing 2 to satisfy: D 壳 ≤d 磁 ≤D 壳 +0.13 (unit: mm), where D 壳 Let d be the inner diameter of housing 2. 磁 The outer diameter of the magnetic ring 3 is designed to ensure high precision in the coaxiality of the components when the magnetic ring 3 is assembled and pressed into the housing 2. At the same time, it allows the end face of the magnetic ring 3 pressed into the housing 2 to better bond with the annular joint wall 61 with added adhesive, improving the long-term stability of the bonding and resulting in high precision of the fan blade outer rotor structure.

[0067] To improve the smoothness of pressing the magnetic ring 3 into the housing 2, the outer circle of the side end of the magnetic ring 3 pressed into the housing 2 is designed with a chamfer K: 15°≤C≤30°; C1=0.3~1mm (where C1 is the radial dimension of the chamfer K, and C is the angle of the chamfer K). This makes it easy to guide and align the magnetic ring 3 when assembling the magnetic ring 3 and the housing 2, ensuring assembly accuracy and improving the component yield. When C and C1 are small, the accuracy is high, but the requirements for tooling and fixtures are high, and the cost is high. Conversely, the requirements for tooling and fixtures are low, and the cost is low.

[0068] Regarding the axial dimensions of the housing 2 and the magnetic ring 3, in one optional embodiment, the housing 2 generally includes a columnar portion 23 forming an annular wall 21 with an axial depth of B2 and an extension portion 24 connected to the inner annular side end of the annular wall 21 via a sloped transition 25, such that the depth of the cavity formed by the extension portion 24 and the columnar portion 23 is B3, and the angle formed by the sloped transition 25 with respect to the extension portion 24 is α1, then B3>B2, B2≤B 磁 ， B here 磁 Let α1 be the axial length of the magnetic ring 3, and α1 ≥ 90°. For the housing 2 here, the design of the extension 24 allows the housing 2 and the fan blade 1 to be integrally injection molded, so that the extension 24 can be embedded into the fan blade 1, thereby improving the strength and firmness of the injection molded assembly formed by the housing 2 and the fan blade 1.

[0069] In summary, for the fan blade outer rotor structure of this embodiment, the volume of the colloid in the receiving part can be quantitatively calculated, thereby quantitatively adding the colloid to the receiving part. When the magnetic ring 3 is fixed to the housing 2 by adhesive bonding, the problem of overflowing colloid due to a large amount of colloid requiring cleaning can be avoided. At the same time, the adhesive bonding is formed at the axial end of the magnetic ring 3 and the housing 2, which can avoid the potential for noise or failure caused by the shrinkage of the outer circular wall of the magnetic ring 3 in the circular receiving cavity 6 of the housing 2 under high temperature and high humidity. As for the fitting method between the outer circular wall of the magnetic ring 3 and the inner side wall of the circular receiving cavity 6 of the housing 2, the pre-tightening design of the radial dimension is used to achieve the fastening between the magnetic ring 3 and the housing 2. Compared with the direct adhesive bonding method, the operation is more convenient and reliable, and it can resist the influence of high temperature and high humidity environment.

[0070] Example 2:

[0071] Based on the wind turbine outer rotor structure of Embodiment 1, the wind turbine outer rotor structure provided in this embodiment has a complete annular structure for both the accommodating part and the positioning part, and the accommodating part and the positioning part are arranged concentrically.

[0072] In this embodiment, for the annular wall 21, its through groove 211 is located on the inner ring side of the annular wall 21, and the corresponding filling block 12 also has a complete annular structure. After the filling block 12 is embedded in the through groove 211, the filling block 12 is concave relative to the annular wall 21. Thus, the filling block 12 embedded in the through groove 211 forms a receiving part, and the part of the annular wall 21 corresponding to its outer ring side forms a positioning part, so that the receiving part is located between the inner side wall of the housing 1 and the positioning part. In this way, the positioning part can achieve axial support for the magnetic ring 3, and the positioning part can also prevent the colloid in the receiving part from flowing sideways.

[0073] In this implementation, the radial and depth dimensions of the annular structure corresponding to the receiving portion can be directly calculated to determine the volume V of the receiving portion (since the annular structure is a regular shape, its volume V is equal to the surface area multiplied by the depth dimension; the surface area can be calculated by combining the radial dimension of the annular structure, making the calculation convenient). Therefore, the mass M of the adhesive added to the receiving portion can be calculated: M = K * V * ρ; where K is the bonding strength coefficient, 1.2 ≤ K ≤ 1.5; and ρ is the density of the corresponding adhesive. More specifically, the depth dimension of the receiving portion is mainly determined by the depth to which the filler block 12 is embedded in the through groove 211. When the filler block 12 is only in contact with the bottom surface of the through groove 211 facing the filler block 12, it can be understood that the depth dimension of the receiving portion is also the thickness dimension of the annular wall 2. Thus, by precisely controlling the mass of the adhesive filled into the receiving portion, the requirements for bonding and fixing the magnetic ring 3 can be met while preventing excess adhesive from overflowing and requiring additional cleaning.

[0074] Example 3:

[0075] Please see Figures 1 to 8 As shown, based on the wind turbine outer rotor structure of Embodiment 1, the accommodating part and the positioning part of the wind turbine outer rotor structure provided in this embodiment are multiple segmented structures arranged at intervals along the circumferential direction of the annular wall 21.

[0076] Specifically, at least two through slots 211 are provided at intervals along the circumferential direction on the annular wall 21, and at least two filling blocks 12 are protruding on the bottom wall of the receiving cavity 11 of the fan blade 1, which are suitable for being embedded in at least two through slots 211 one by one.

[0077] Based on the above structure, the positioning part includes at least two protrusions 51 formed by each filling block 12 protruding from the annular wall 21 in the embedded through groove 211; and the receiving part includes at least two grooves 52 formed on the annular wall 21 and located circumferentially between each pair of adjacent protrusions 51. To ensure that each protrusion 51 reliably supports the magnetic ring 3, all protrusions 51 are at the same height relative to the grooves 52. The grooves 52 are directly formed on the annular wall 21, and as long as the end face of the annular wall 21 facing the magnetic ring 3 is flat, all grooves 52 have the same depth. It can be understood that the depth of the groove 52 is the same as the height of the protrusion of the protrusion 51 relative to the groove 52. Here, the height of the protrusion 51 and the depth of the groove 52 are defined as B. In this optional case, the arc length of each protrusion 51 in the circumferential direction is less than the arc length of any groove 52. In this case, the depth of each groove 52 does not need to be too large to meet the requirements for accommodating the colloid, thus ensuring that the volume of each groove 52 meets the usage requirements.

[0078] Based on the above, and furthermore, for the two or more protrusions 51 used, theoretically they can be distributed unevenly along the circumference. However, in this embodiment, considering that it is convenient to calculate the total mass of colloid that the two or more grooves 52 can accommodate (corresponding to the need to obtain the volume of each groove 52), it is preferable to design the two or more protrusions 51 to be evenly arranged, so that the grooves 52 are also evenly distributed. This requires that the shape and size of each protrusion 51 be the same.

[0079] Furthermore, based on the above structure, a stop portion is also formed on the annular joint wall 61; the stop portion includes multiple baffles 53 located in each groove 52 and extending in the circumferential direction. Each baffle 53 is protruding relative to the groove 52. That is to say, the protrusion 51 only serves to limit the groove 52 in the circumferential direction, so that the colloid in each groove 52 will not leave the corresponding limiting range of the groove 52 in the circumferential direction, but it does not limit the colloid in the groove 52 in the radial direction. Therefore, a radial limiting structure for the colloid in the groove 52 is designed here, namely the baffles 53. For this purpose, each baffle 53 is located on one side of the groove 52 facing the axis of the circular receiving cavity 6.

[0080] It should be noted that the forming method of the baffle 53 in this embodiment can be either directly formed on the annular wall 21 in a protruding manner, or it can be formed in a manner similar to that of the protrusion 51 in this embodiment, that is, a slot similar to a through groove 211 is formed on the annular wall 21, and then, during the integral injection molding of the housing 2 and the fan blade 1, an insert block similar to a filler block 12 on the fan blade 1 is inserted into the above-mentioned slot, and the baffle 53 is formed by protruding from the annular wall 21. Therefore, the final forming method of the baffle 53 in this embodiment is not absolutely limited.

[0081] Based on the above structure, and considering the need to avoid interference between the baffle 53 and the protrusion 51 on the axial support of the magnetic ring 3, the height of each baffle 53 protruding relative to the groove 52 is no greater than the height of any protrusion 51 protruding relative to the groove 52.

[0082] Furthermore, it should be noted that regarding the shape of the retaining strip 53, one optional and easily manufactured option is to adopt an arc-shaped structure. According to this structure, in one optional implementation, the inner arc wall of the retaining strip 53 facing the axis of the circular receiving cavity 6 can be coplanar with the inner arc wall of the protrusion 51 facing the axis of the circular receiving cavity 6. In this case, the length of each retaining strip 53 extending circumferentially is less than or equal to the length of the groove 52 extending circumferentially, and a central angle β is formed between any end of each retaining strip 53 along the circumferential direction and the protrusion 51 at the same end of that retaining strip 53; β = 0°; or 0° < β ≤ 10°. In another optional implementation, the outer arc wall of the retaining strip 53 facing away from the axis of the circular receiving cavity 6 is coplanar with the inner arc wall of the protrusion 51 facing the axis of the circular receiving cavity 6. In this case, the length of each retaining strip 53 extending circumferentially can also be greater than the length of the groove 52 extending circumferentially. Therefore, the specific parameters for the baffle 53 can be designed based on its actual layout position, and this embodiment does not impose absolute limitations on this.

[0083] Based on the above structure, for the arc-shaped baffle 53, let the outer diameter of the arc-shaped outer wall of the baffle 53 facing away from the axis of the circular receiving cavity 6 be R, and let the inner diameter of the arc-shaped inner wall of the baffle 53 facing the axis of the circular receiving cavity 6 be R1, where R-R1≥0.5mm and 2R≥d1 磁 Here, d1 is the inner diameter of the magnetic ring 3. This design makes the groove 52 a relatively closed area in the radial dimension with the cooperation of the baffle 53 and the annular receiving ring, while the radial surface of the magnetic ring 3 can completely cover the radial surface of the groove 52.

[0084] Based on the above, and considering the case of the arc-shaped baffle 53, the shape of the protrusion 51 is not theoretically absolutely limited. Also, for the purpose of calculating the volume of the groove 52, the protrusion 51 can adopt a regular shape, such as a rectangle, an arc, or other shapes. This embodiment does not impose absolute limitations on this. Here, considering the arc-shaped protrusion 51, each corresponding groove 52 is also arc-shaped. Thus, by using the inner arc dimension, outer arc dimension, inner diameter, and outer diameter of each groove 52, the radial surface area S of each groove 52 can be obtained. Therefore, the mass M of the colloid filled into the receiving part can be calculated: M = K * B * S * ρ * N; where K is the adhesive strength coefficient, 1.2 ≤ K ≤ 1.5; ρ is the density of the corresponding colloid; and N is the number of grooves 52.

[0085] Based on the above, and for ease of calculation, each protrusion 51 can also be designed as rectangular. In this case, the dimension of the protrusion 51 along the circumferential direction of the annular wall 21 can be understood as a tangent. Thus, by measuring the radius of the outer ring of the annular wall 21 and subtracting the radius of the edge of the corresponding retainer 53 facing the groove 52, the total surface area of ​​the multiple grooves 52 and protrusions 51 in the annular wall 21 can be calculated. For rectangular protrusions 51, the surface area of ​​each protrusion 51 can be calculated using the circumferential dimension L of the protrusion 51 along the annular wall 21 and the radial dimension H of the protrusion 51 along the annular wall 21. Therefore, by subtracting the total surface area of ​​the multiple protrusions 51 from the total surface area of ​​the multiple grooves 52 and protrusions 51 in the annular wall 21, the total surface area of ​​the multiple grooves 52 can be obtained. Since the multiple grooves 52 are uniformly arranged, the surface area of ​​each groove 52 only needs to be equal to the total surface area of ​​the multiple grooves 52.

[0086] It should be noted that when the filler block 12 embedded in the through groove 211 protrudes from the annular wall 2, forming the protrusion 51 and the groove 52 formed by the annular wall 2, B is generally 0.05~0.25mm. Therefore, when the torque of the fan using the external rotor structure of this embodiment is relatively small, that is, the dimensions L and H of the protrusion 51 can be designed to be relatively large, and the corresponding B value can be small. This not only reduces the cost of parts but also achieves the required bonding strength. At the same time, K can also be relatively small to meet the strength requirements of the environment. Similarly, when selecting anaerobic adhesive and keeping the process simple, smaller B and K values ​​can also be chosen. When the torque of the fan using the external rotor structure of this embodiment is large, the dimensions L and H of the protrusion 51 can be designed to be relatively small, directly increasing the radial surface area S of each groove 52. The B value can be larger to improve the bonding strength, and K can also be relatively large to ensure the bonding area to meet the strength requirements of the environment. At this time, choosing epoxy or acrylate colloids can achieve better bonding strength, and the process is simple, eliminating the risk of colloids being thrown out.

[0087] Generally, N≥2, and 3 to 6 are usually used. When the dimensions L and H of the protrusion 51 can be designed to be relatively large, N can be small; conversely, N can be large. This makes the plane of the magnetic ring 3 after being pressed into the housing 2 fit better, ensuring the bonding strength. At the same time, the dimensions of the outer rotor structure of the fan blade are more stable.

[0088] Finally, it is necessary to explain that, in order to ensure the bonding effect, the size H of each protrusion 51 is not greater than the radial dimension of the annular wall 21; while the radial dimension of the magnetic ring 3 is greater than the radial dimension of the groove 52, ensuring that the radial surface of the magnetic ring 3 fully covers the radial surface of the groove 52.

[0089] Example 4:

[0090] Please see Figures 9 to 14 As shown, based on the wind turbine outer rotor structure of Embodiment 1, the accommodating part of the wind turbine outer rotor structure provided in this embodiment is a plurality of segmented structures arranged at intervals along the circumferential direction of the annular wall 21.

[0091] Specifically, at least two through slots 211 are provided at intervals along the circumferential direction on the annular wall 21, and at least two filling blocks 12 are protruding on the bottom wall of the receiving cavity 11 of the fan blade 1, which are suitable for being embedded in at least two through slots 211 one by one.

[0092] More specifically, the receiving portion includes at least two recesses 52 formed by each filling block 12 recessed in the embedded through groove 211 into the annular wall 21; and the positioning portion includes all portions of the annular wall 21 except for the recesses 52.

[0093] Based on the above, in this example, considering the case of using an arc-shaped groove 52 for easy calculation of its volume, the radial surface area S of each groove 52 can be obtained by taking the inner arc dimension, outer arc dimension, inner diameter, and outer diameter of each groove 52 as an example. Therefore, the mass M of the colloid filled into the receiving part can be calculated: M = K * B * S * ρ * N; where K is the adhesive strength coefficient, 1.2 ≤ K ≤ 1.5; ρ is the density of the corresponding colloid; and N is the number of grooves 52. It should be noted that in this embodiment, B is generally 0.1–0.25 mm. Regarding the radial surface area S of the groove 52, a rectangular through-slot 211 can also be used in conjunction with a rectangular filling block 12 to directly calculate the area of ​​the end face of the filling block 21 embedded in the through-slot 211. This can be calculated based on the circumferential dimension L1 of the groove 52 formed by the filling block 12 along the annular wall 21 and the radial dimension H1 of the groove 52 along the annular wall 21.

[0094] In this regard, when the torque of the fan using the external rotor structure of this embodiment is relatively small, the dimensions L1 and H1 of the groove 52 can be designed to be relatively small, and the corresponding B value can be small. This not only reduces the cost of parts but also achieves the required bonding strength. At the same time, K can also be relatively small to meet the strength requirements of the environment. When the torque of the fan using the external rotor structure of this embodiment is relatively large, the dimensions L1 and H1 of the groove 52 can be designed to be relatively small. This directly increases the radial surface area S of each groove 52, and the B value can be larger to improve the bonding strength. At the same time, K can also be relatively large to ensure the bonding area to meet the strength requirements of the environment. In this case, choosing epoxy or acrylate colloids can achieve better bonding strength, and the process is simple, eliminating the risk of colloid ejection.

[0095] Finally, it should be noted that the housing 2 of the outer rotor structure of the fan blade in this embodiment can be as follows: it includes a columnar portion 23 forming an annular wall 21 with an axial depth of B2 and an extension portion 24 connected to the inner ring side end of the annular wall 21 via a slope transition 25, as in Embodiment 1. Alternatively, the housing 2 can have only an annular wall 21 without the slope transition 25 and the extension portion 24. In this case, the fan blade 1 may not form a filling block 12. Instead, when the housing 2 and the fan blade 1 are integrally injection molded, the bottom wall of the cavity of the fan blade 1 directly forms a fit against the side end face of the annular wall 21 facing away from the magnetic ring 3, so that the bottom wall of the cavity of the cavity 11 fits against the side end face of the through groove 211 facing away from the magnetic ring 3. This can be understood as forming a groove 52 directly at the through groove 211, and the depth dimension of the groove 52 is the same as the thickness dimension of the annular wall 2. In this way, the quality of the adhesive filled into the receiving part can be precisely controlled to meet the requirements for bonding and fixing the magnetic ring 3 while preventing excess adhesive from overflowing and requiring additional cleaning.

[0096] Example 5:

[0097] Based on the wind turbine outer rotor structure of Embodiment 1, Embodiment 2, Embodiment 3, or Embodiment 4, this embodiment provides a processing and assembly method for the wind turbine outer rotor structure, applicable to the wind turbine outer rotor structure of Embodiment 1 or Embodiment 2, including:

[0098] Step S1: The housing 2 and the fan blade 1 are integrally injection molded to form a circular receiving cavity 6; and an annular joint wall 61 is formed on the cavity wall along its axial direction of the circular receiving cavity 6; the annular joint wall 61 includes a positioning part for axial support of the magnetic ring and a receiving part for accommodating the colloid.

[0099] Step S2: Calculate the volume of the receiving part to determine the amount of colloid to be used, and place the determined amount of colloid into the receiving part;

[0100] Step S3: Press the magnetic ring 3 into the circular receiving cavity 6 and fix it by adhesive bonding.

[0101] It should be noted that the specific calculation method for determining the volume of the accommodating part in step S2 varies depending on the different structures of the accommodating part. This has been specifically explained in Embodiments 2, 3, and 4, and will not be repeated here.

[0102] In the processing and assembly method of the external rotor structure of the fan blade in this embodiment, since the amount of adhesive can be precisely controlled, the bonding requirements of the housing 2 and the magnetic ring 3 can be met while avoiding the problem of excess adhesive overflowing and requiring additional adhesive cleaning procedures. Furthermore, for the external rotor structure of the fan blade used in this embodiment, the required parameters for determining the volume of its accommodating cavity, combined with the relatively regular shapes of the protrusion 51 and the groove 52, are easy to obtain and their accuracy is controllable. This makes the assembly process of the overall external rotor structure of the fan easy to implement and reduces operational difficulty.

[0103] Example 6:

[0104] Based on the external rotor structure of the fan blade in Embodiment 1, Embodiment 2, Embodiment 3, or Embodiment 4, this embodiment provides a fan that adopts the external rotor structure of Embodiment 1, Embodiment 2, Embodiment 3, or Embodiment 4. It can ensure the fan operates normally in high-temperature and high-humidity environments, preventing the casing 2 and magnetic ring 3 from loosening and causing noise during operation, and even preventing the casing 2 and magnetic ring 3 from detaching and causing fan failure, thus allowing the fan to operate smoothly.

[0105] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0106] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0107] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can 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 invention according to the specific circumstances.

[0108] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0109] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0110] In this invention, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A fan blade external rotor structure, characterized in that, include: The fan blade has a housing cavity; The housing is suitable for integral injection molding and fixing in the accommodating cavity to cooperate with the fan blades to form a circular receiving cavity; A magnetic ring, suitable for fixing in a circular receiving cavity by adhesive bonding; wherein The circular receiving cavity has an annular joint wall formed on its axial cavity wall for fixing the magnetic ring; and the annular joint wall includes a positioning part for providing axial support for the magnetic ring and a receiving part for accommodating the colloid; and the receiving part is recessed relative to the positioning part.

2. The fan blade external rotor structure according to claim 1, characterized in that, The end face of the housing corresponding to the bottom of the circular receiving cavity has an annular wall; the annular wall is provided with at least one through groove that is hollowed out; and At least one filling block suitable for one-to-one embedding in the through slot is formed on the bottom wall of the receiving cavity of the fan blade.

3. The fan blade external rotor structure according to claim 2, characterized in that, The filler block is adapted to fill the radial surface of the through slot; and When the filling block embedded in the through groove protrudes along the axial direction of the circular receiving cavity from the annular wall, the filling block forms the positioning part, and the annular wall forms the receiving part; When the annular wall protrudes along the axial direction of the circular receiving cavity from the filling block embedded in the through groove, the positioning part is formed by the annular wall, and the receiving part is formed by the filling block.

4. The fan blade external rotor structure according to claim 3, characterized in that, At least two through slots are provided at intervals along the circumference of the annular wall, and at least two filling blocks are protruding on the bottom wall of the accommodating cavity of the fan blade, which are suitable for being embedded in at least two through slots one to one.

5. The fan blade external rotor structure according to claim 4, characterized in that, The positioning portion includes at least two protrusions formed by each filler block protruding from the annular wall in the embedded slot; and The receiving portion includes at least two grooves formed on the annular wall and located circumferentially between every two adjacent protrusions; and At least two of the bumps have the same height relative to the groove protrusion; the radial dimension of each bump is not greater than the radial dimension of the annular joint wall.

6. The fan blade external rotor structure according to claim 5, characterized in that, A stop portion is also formed on the annular joint wall; The stop portion includes multiple stop bars located in each groove and extending in the circumferential direction; Each of the aforementioned retaining strips is raised relative to the groove; and Each of the aforementioned baffles is located on one side of the groove facing the axis of the circular receiving cavity.

7. The fan blade external rotor structure according to claim 6, characterized in that, The height of each of the aforementioned baffles relative to the groove protrusion is no greater than the height of any single protrusion relative to the groove; and The length of each of the aforementioned baffles extending in the circumferential direction is less than or equal to the length of the groove extending in the circumferential direction.

8. The fan blade external rotor structure according to claim 6 or 7, characterized in that, A central angle β is formed between the protrusion on either side of each of the baffles along the circumferential direction and the same side of the baffle; 0°≤β≤10°。 9. The fan blade external rotor structure according to claim 4, characterized in that, The receiving portion includes at least two recesses formed by each filler block recessed into the annular wall within the embedded slot; and The positioning part includes all parts of the annular wall except for the groove.

10. The fan blade external rotor structure according to claim 5 or 9, characterized in that, The radial dimension of the magnetic ring is larger than the radial dimension of the groove.

11. A method for machining and assembling an external rotor structure for a wind turbine blade, characterized in that, The wind turbine external rotor structure as described in any one of claims 1 to 10 includes: Step S1: The housing and the fan blade are integrally injection molded to form a circular receiving cavity; and an annular joint wall is formed on the cavity wall along its axial direction; the annular joint wall includes a positioning part for axial support of the magnetic ring and a receiving part for accommodating the colloid. Step S2: Calculate the volume of the receiving part to determine the amount of colloid to be used, and place the determined amount of colloid into the receiving part; Step S3: Press the magnetic ring into the circular receiving cavity and fix it with adhesive.

12. A fan, characterized in that, include: The fan blade external rotor structure as described in any one of claims 1 to 10.

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