Fan blade and fan

Abstract

The utility model discloses a fan blade and a fan, and relates to the technical field of electric appliances. The hub comprises a hub body and a connecting piece integrally formed with the hub body, the connecting piece is located in the center of the hub body, a first assembly hole is formed in the center of the connecting piece, and the connecting piece and the first assembly hole are both of a D-shaped structure. And the outer side of the connecting piece is provided with a stepped shape-following groove which is arranged around the connecting piece. Therefore, the D-shaped first assembly hole is directly formed in the fan blade through one-time injection molding, and on the basis that the assembly tolerance requirement is met, the production process is simplified, and the production cost is reduced. Moreover, the geometric structure of the connecting piece can be optimized by introducing the stepped shape follow-up groove in the outer side of the connecting piece, so that the cooling shrinkage caused by the structural thickness difference of the connecting piece is reduced.

Description

Technical Field

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

[0002] The mating holes of AC fan blades are typically designed in a D-shape to facilitate assembly with the D-shaft of the AC motor that drives the fan, providing anti-rotation and precise positioning. Current fan blades are usually made of polypropylene or a mixture of polypropylene and glass fiber through injection molding. However, due to the anisotropic shrinkage effect of semi-crystalline materials (the phenomenon that the shrinkage properties of materials differ in different directions), the roundness of the fan blade shaft hole must meet the tolerance requirements for assembly with the D-shaft of the AC motor.

[0003] To meet tolerance requirements, a bushing with a D-shaped hole structure is usually added to the fan blade shaft hole and fixed to the fan blade through secondary injection molding. Although this solution meets the assembly tolerance requirements, it also increases the production cost and process complexity of the fan blade. Utility Model Content

[0004] To address the problem of high production costs and complex processes caused by the need for secondary injection molding to fix the fan blade shaft hole and bearing to meet assembly tolerance requirements, this utility model is proposed to provide a fan blade and fan that overcomes or at least partially solves the above problems.

[0005] Based on a first aspect of this utility model, a wind vane is provided, the wind vane including a hub body and a connector integrally formed with the hub body, the connector being located at the center of the hub body, and a first mounting hole being provided at the center of the connector, wherein both the connector and the first mounting hole are D-shaped structures, and a stepped conformal groove is provided around the outer side of the connector.

[0006] In one optional embodiment of the utility model, the stepped conformal groove includes:

[0007] The first conformal groove is located on the planar side of the side end face of the connector;

[0008] The second conformal groove is located on the arc side of the side end face of the connector and is connected to both ends of the first conformal groove, wherein the groove depth of the second conformal groove is less than the groove depth of the first conformal groove.

[0009] In one optional embodiment of the utility model, the ratio between the bottom wall thickness of the first conformal groove and the wall thickness of the hub body is set within 0.9-1.

[0010] In one optional embodiment of the utility model, the ratio between the groove depth of the first conformal groove and the wall thickness of the hub body is set within 0.7-2.

[0011] In one optional embodiment of the utility model, the ratio between the bottom wall thickness of the second conformal groove and the wall thickness of the hub body is set within 0.4-0.5.

[0012] In one optional embodiment of the utility model, the ratio between the outer diameter of the second conformal groove and the outer diameter of the arc side of the side end face of the connector is set to 1.15-1.6 times.

[0013] In one optional embodiment of the utility model, the fan blade further includes a plurality of first reinforcing ribs, which are located in the stepped conformal groove and are distributed at equal angles about the central axis of the hub body. One end of each first reinforcing rib is connected to the hub body, and the other end is connected to the connector.

[0014] In one optional embodiment of the utility model, the fan blade further includes an extension fixed coaxially with the connector, wherein the extension extends to the end face of the hub body away from the connector and has a second mounting hole for assembly with the motor shaft.

[0015] In one optional embodiment of the utility model, the fan blade further includes a plurality of second reinforcing ribs located on the hub body and distributed at equal angles about the central axis of the extension.

[0016] In one optional embodiment of the utility model, the fan blade further includes a rim, which is disposed on the end face of the hub body away from the connector and surrounds the extension, wherein one end of the second reinforcing rib is connected to the rim and the other end is connected to the outer side of the connector.

[0017] In one optional embodiment of the utility model, the wheel hub body, the extension, the second reinforcing rib, and the rim are an integral structure.

[0018] Based on a second aspect of this utility model, a fan is also provided, the fan comprising the fan blades as described in any of the above utility model contents.

[0019] Compared with existing technologies, this utility model includes a hub body and a connector integrally formed with the hub body. The connector is located at the center of the hub body, and a first mounting hole is formed at the center of the connector. Both the connector and the first mounting hole are D-shaped structures. A stepped conformal groove is formed around the outer side of the connector. Thus, the D-shaped first mounting hole is directly formed on the fan blade through a single injection molding process, satisfying assembly tolerance requirements while simplifying the production process and reducing production costs. Furthermore, by introducing a stepped conformal groove on the outer side of the connector, the geometry of the connector can be optimized, thereby reducing the amount of cooling shrinkage caused by differences in the structural thickness of the connector.

[0020] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0022] In the attached diagram:

[0023] Figure 1 This is a three-dimensional structural diagram of the first part of a fan blade provided in an embodiment of the present invention;

[0024] Figure 2 This is a first three-dimensional structural diagram of a fan blade provided in an embodiment of the present utility model;

[0025] Figure 3 This is a front view structural diagram of a fan blade provided in an embodiment of the present utility model;

[0026] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0027] Figure 5 yes Figure 4 Enlarged structural diagram at point C;

[0028] Figure 6 yes Figure 3 Schematic diagram of the cross-sectional structure at point BB;

[0029] Figure 7This is a schematic diagram of the second three-dimensional structure of a wind turbine blade provided in an embodiment of this utility model;

[0030] Figure 8 This is a three-dimensional structural diagram of the second part of a wind turbine blade provided in an embodiment of this utility model;

[0031] Reference numerals: 1. Hub body; 2. Connector; 201. First mounting hole; 202. Flat side; 203. Arc side; 3. Stepped conformal groove; 31. First conformal groove; 32. Second conformal groove; 4. First reinforcing rib; 5. Extension; 501. Second mounting hole; 6. Second reinforcing rib; 7. Edge; 8. Blade. Detailed Implementation

[0032] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0033] The mating holes of AC fan blades are typically designed in a D-shape to facilitate assembly with the D-shaft of the AC motor that drives the fan, providing anti-rotation and precise positioning. Current fan blades are usually made of polypropylene or a mixture of polypropylene and glass fiber through injection molding. However, due to the anisotropic shrinkage effect of semi-crystalline materials (the phenomenon that the shrinkage properties of materials differ in different directions), the roundness of the fan blade shaft hole must meet the tolerance requirements for assembly with the D-shaft of the AC motor.

[0034] To meet tolerance requirements, a bushing with a D-shaped hole structure is usually added to the fan blade shaft hole and fixed to the fan blade through secondary injection molding. Although this solution meets the assembly tolerance requirements, it also increases the production cost and process complexity of the fan blade.

[0035] Based on the aforementioned technical problems, this utility model embodiment is proposed. This utility model embodiment may include a hub body 1 and a connector 2 integrally formed with the hub body 1. The connector 2 is located at the center of the hub body 1, and a first mounting hole 201 is formed at the center of the connector 2. Both the connector 2 and the first mounting hole 201 are D-shaped structures. A stepped conformal groove 3 is formed around the outer side of the connector 2. Thus, by directly forming the D-shaped first mounting hole 201 on the fan blade through a single injection molding process, assembly tolerance requirements are met, while the production process is simplified and production costs are reduced. Furthermore, by introducing the stepped conformal groove 3 on the outer side of the connector 2, the geometry of the connector 2 can be optimized, thereby reducing the cooling shrinkage deformation of the connector 2 caused by material thickness differences.

[0036] Reference Figure 1-8 This utility model embodiment provides a fan blade, which includes a hub body 1 and a connector 2 integrally formed with the hub body 1. The connector 2 is located at the center of the hub body 1, and a first mounting hole 201 is formed at the center of the connector 2. Both the connector 2 and the first mounting hole 201 are D-shaped structures. A stepped conformal groove 3 is formed around the outer side of the connector 2.

[0037] In this embodiment of the invention, the fan blade may include a hub body 1 and a connector 2, wherein the hub body 1 and the connector 2 are an integral structure, for example, the hub body 1 and the connector 2 can be obtained by one-time injection molding. The radial cross-sectional shape of the hub body 1 may be circular, the connector 2 is located at the center of the hub body 1, and the center of the connector 2 is provided with a first mounting hole 201 that penetrates the connector 2 along the axial direction of the hub body 1.

[0038] Both the connector 2 and the first mounting hole 201 are D-shaped structures. In other words, the connector 2 can have a D-shaped annular cross-sectional shape along the radial direction of the hub body 1, and the first mounting hole 201 is also D-shaped along the radial direction of the hub body 1. Since both the connector 2 and the first mounting hole 201 are D-shaped, and the planar side 202 of the side end face of the connector 2 is parallel to the planar side 202 of the first mounting hole 201, the consistency of the hole wall thickness (also referred to as the wall thickness of the connector 2) can be improved. This reduces the elliptical deformation problem caused by anisotropic shrinkage of the material due to differences in the hole wall thickness of the first mounting hole 201, improving the roundness or assembly accuracy of the connector 2 and the motor shaft.

[0039] The outer side of the connector 2 is provided with a stepped conformal groove 3 surrounding the connector 2. Since the connector 2 and the hub body 1 are an integral structure, the stepped conformal groove 3 can be provided at the connection between the connector 2 and the hub body 1, wherein the stepped conformal groove 3 is provided around the outer end face of the connector 2. For example, the stepped conformal groove 3 has an annular structure that wraps around the connector 2 along the radial cross-section of the hub body 1. For example, the outer edge of the stepped conformal groove 3 along the radial cross-section of the hub body 1 is circular. Thus, by providing the stepped conformal groove 3, the wall thickness uniformity at the connection between the connector 2 and the hub body 1 can be improved, thereby further reducing the elliptical deformation problem caused by anisotropic shrinkage of the material due to the wall thickness difference at the connection between the connector 2 and the hub body 1, and improving the assembly accuracy of the connector 2 and the motor shaft.

[0040] An optional embodiment of the utility model, referring to... Figure 1 , Figure 4 , Figure 5 as well as Figure 6 As shown, the stepped conformal groove 3 may include a first conformal groove 31 and a second conformal groove 32. The first conformal groove 31 is located on the planar side 202 of the side end face of the connector 2, and the second conformal groove 32 is located on the arc side 203 of the side end face of the connector 2 and is connected to both ends of the first conformal groove 31 respectively. The groove depth of the second conformal groove 32 is less than the groove depth of the first conformal groove 31.

[0041] In this embodiment of the invention, the stepped conformal groove 3 refers to at least two conformal grooves with different depths, resulting in a stepped structure at the junction of the two grooves. For example, the stepped conformal groove 3 may include a first conformal groove 31 and a second conformal groove 32. The first conformal groove 31 is located on the planar side 202 of the side end face of the connector 2, and the second conformal groove 32 is located on the arcuate side 203 of the side end face of the connector 2. The two ends of the first conformal groove 31 and the two ends of the second conformal groove 32 are respectively connected, so that the connector 2 can be completely enclosed by the cooperation of the first conformal groove 31 and the second conformal groove 32.

[0042] Considering that the geometric stability of the planar side 202 of the side end face of the connector 2 is worse than that of the arc side 203, which is prone to material deformation leading to deformation of the first assembly hole 201, thus affecting the assembly accuracy of the connector 2 and the motor shaft, the groove depth of the second conformal groove 32 is less than that of the first conformal groove 31. This allows the connector 2 to connect with the hub body 1 at the planar side 202 through the bottom of the first conformal groove 31, and the connector 2 to connect with the hub body 1 at the arc side 203 through the bottom of the second conformal groove 32. Thus, the bottom of the first conformal groove 31 and the bottom of the second conformal groove 32 can provide structural support for the connector 2 at different positions along the axial direction of the hub body 1, thereby improving the uniformity of stress on the connector 2 and reducing the cooling shrinkage deformation of the connector 2 due to material thickness differences.

[0043] An optional embodiment of the utility model, referring to... Figure 5 As shown, the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 is set within 0.9-1.

[0044] In this embodiment of the present invention, the bottom wall thickness of the first conformal groove 31 can be understood as the wall thickness H1 at the connection between the hub body 1 and the side end face 202 of the connecting member 2. The wall thickness of the hub body 1 can be understood as the radial wall thickness H2 of the hub body 1. The ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 is set within 0.9-1, which can be understood as the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 being greater than or equal to 0.9, and the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 being less than or equal to 1. Within this ratio limit range, the connection strength and wall thickness uniformity between the connecting member 2 and the hub body 1 on the side 202 can be guaranteed. If the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 is less than 0.9, the wall thickness at the connection between the connector 2 and the hub body 1 on the planar side 202 is small. This makes it easy for the material to exhibit significant anisotropic shrinkage due to excessively thin injection molding at the connection between the connector 2 and the hub body 1 on the planar side 202, thereby increasing the cooling shrinkage rate of the connector 2 and reducing the assembly accuracy between the connector 2 and the motor shaft.

[0045] If the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 is greater than 1, the wall thickness at the connection between the connector 2 and the hub body 1 on the planar side 202 will be thicker. This will easily lead to an increased unevenness in wall thickness between the connector 2 and the hub body 1 at the connection on the planar side 202 due to excessive injection molding thickness. This will result in a significant anisotropic shrinkage effect of the material of the connector 2 and increase the cooling shrinkage rate of the connector 2, thereby reducing the assembly accuracy between the connector 2 and the motor shaft.

[0046] For example, the bottom wall thickness H1 of the first conformal groove 31 can be 2 mm, and the wall thickness H2 of the hub body 1 can be 2.2 mm. The ratio between the bottom wall thickness H1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 0.91. As another example, the bottom wall thickness H1 of the first conformal groove 31 can be 1.8 mm, and the wall thickness H2 of the hub body 1 can be 2 mm. The ratio between the bottom wall thickness H1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 0.9. Yet another example, the bottom wall thickness H1 of the first conformal groove 31 can be 2 mm, and the wall thickness H2 of the hub body 1 can be 2 mm. The ratio between the bottom wall thickness H1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 1. Those skilled in the art can select the bottom wall thickness of the first conformal groove 31 and the wall thickness of the wheel hub body 1 based on actual processing requirements and the range of the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the wheel hub body 1 described above. No further limitations are imposed here.

[0047] An optional embodiment of the utility model, referring to... Figure 5 As shown, the ratio between the groove depth of the first conformal groove 31 and the wall thickness of the hub body 1 is set within 0.7-2.

[0048] In this embodiment of the present invention, the groove depth of the first conformal groove 31 refers to the opening depth S1 of the first conformal groove 31 along the axial direction of the hub body 1. The ratio between the groove depth S1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is set within 0.7-2. This can be understood as the ratio between the groove depth S1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 being greater than or equal to 0.7, and the ratio between the groove depth S1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 being less than or equal to 2. Within this ratio limit range, it can be ensured that the bottom of the first conformal groove 31 is a certain distance lower than the bottom of the second conformal groove 32 along the axial direction of the hub body 1, thereby reducing the shrinkage rate of the connector 2 at the planar side 202 due to the anisotropic shrinkage effect of the material during cooling shrinkage.

[0049] If the ratio between the groove depth of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is less than 0.7, the thickness of the bottom of the first conformal groove 31 is too large. If the ratio between the groove depth of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is greater than 2, the thickness of the bottom of the first conformal groove 31 is too thin. Both excessively thick and excessively thin thicknesses will significantly increase the unevenness of the wall thickness distribution at the connection point between the connector 2 and the hub body 1 on the planar side 202. This leads to a significant anisotropic shrinkage effect of the material in the connector 2 and increases the cooling shrinkage rate of the connector 2, thereby reducing the assembly accuracy between the connector 2 and the motor shaft.

[0050] For example, the groove depth S1 of the first conformal groove 31 can be 4 mm, and the wall thickness H2 of the hub body 1 can be 2.2 mm. The ratio between the groove depth S1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 1.82. As another example, the groove depth S1 of the first conformal groove 31 can be 1.5 mm, and the wall thickness H2 of the hub body 1 can be 2.2 mm. The ratio between the groove depth S1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 0.68. Yet another example, the groove depth S1 of the first conformal groove 31 can be 4.4 mm, and the wall thickness H2 of the hub body 1 can be 2.2 mm. The ratio between the groove depth S1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 2. Those skilled in the art can select the bottom wall thickness of the second conformal groove 32 and the wall thickness of the hub body 1 based on actual processing requirements and the range of the ratio between the bottom wall thickness of the second conformal groove 32 and the wall thickness of the hub body 1 described above. No further limitations are imposed here.

[0051] An optional embodiment of the utility model, referring to... Figure 5As shown, the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 is set within 0.9-1. The ratio between the bottom wall thickness of the second conformal groove 32 and the wall thickness of the hub body 1 is set within 0.4-0.5.

[0052] In this embodiment of the present invention, the bottom wall thickness of the first conformal groove 31 can be understood as the wall thickness H1 at the connection between the hub body 1 and the side end face 202 of the connecting member 2. The wall thickness of the hub body 1 can be understood as the radial wall thickness H2 of the hub body 1. The ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 is set within 0.9-1, which can be understood as the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 being greater than or equal to 0.9, and the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 being less than or equal to 1. Within this ratio limit range, the connection strength and wall thickness uniformity between the connecting member 2 and the hub body 1 on the side 202 can be guaranteed. If the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 is less than 0.9, the wall thickness at the connection between the connector 2 and the hub body 1 on the planar side 202 is relatively small. Due to the excessively thin injection molding thickness at the connection between the connector 2 and the hub body 1 on the planar side 202, the anisotropic shrinkage effect of the material is significant, increasing the cooling shrinkage rate of the connector 2 and thus reducing the assembly accuracy between the connector 2 and the motor shaft.

[0053] If the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the hub body 1 is greater than 1, the wall thickness at the connection between the connector 2 and the hub body 1 on the planar side 202 will be thicker. This will easily lead to an increased unevenness in wall thickness between the connector 2 and the hub body 1 at the connection on the planar side 202 due to excessive injection molding thickness. This will result in a significant anisotropic shrinkage effect of the material of the connector 2 and increase the cooling shrinkage rate of the connector 2, thereby reducing the assembly accuracy between the connector 2 and the motor shaft.

[0054] For example, the bottom wall thickness H1 of the first conformal groove 31 can be 2 mm, and the wall thickness H2 of the hub body 1 can be 2.2 mm. The ratio between the bottom wall thickness H1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 0.91. As another example, the bottom wall thickness H1 of the first conformal groove 31 can be 1.8 mm, and the wall thickness H2 of the hub body 1 can be 2 mm. The ratio between the bottom wall thickness H1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 0.9. Yet another example, the bottom wall thickness H1 of the first conformal groove 31 can be 2 mm, and the wall thickness H2 of the hub body 1 can be 2 mm. The ratio between the bottom wall thickness H1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 1. Those skilled in the art can select the bottom wall thickness of the first conformal groove 31 and the wall thickness of the wheel hub body 1 based on actual processing requirements and the range of the ratio between the bottom wall thickness of the first conformal groove 31 and the wall thickness of the wheel hub body 1 described above. No further limitations are imposed here.

[0055] The bottom wall thickness of the second conformal groove 32 can be understood as the wall thickness H3 at the connection between the hub body 1 and the arc side 203 of the connector 2. The ratio between the bottom wall thickness H3 of the second conformal groove 32 and the wall thickness H2 of the hub body 1 is set within 0.4-0.5. This can be understood as the ratio between the bottom wall thickness of the second conformal groove 32 and the wall thickness of the hub body 1 being greater than or equal to 0.4, and the ratio between the bottom wall thickness of the second conformal groove 32 and the wall thickness of the hub body 1 being less than or equal to 0.5. Within this ratio limit, the connection strength between the connector 2 and the hub body 1 at the arc side 203 can be guaranteed. At the same time, the geometric structure distribution at the planar side 202 of the connector 2 can be adjusted by reducing the bottom thickness of the second conformal groove 32 so that the bottom thickness of the first conformal groove 31 is greater than the bottom thickness of the second conformal groove 32. This can reduce the elliptical deformation or warping deformation of the connector 2 caused by the anisotropic shrinkage of the material.

[0056] If the ratio between the bottom wall thickness of the second conformal groove 32 and the wall thickness of the hub body 1 is less than 0.4, then the bottom wall thickness of the second conformal groove 32 is determined to be too thin. If the ratio between the bottom wall thickness of the second conformal groove 32 and the wall thickness of the hub body 1 is greater than 0.5, then the bottom wall thickness of the second conformal groove 32 is determined to be too thick. Both excessively thick and excessively thin thicknesses will significantly increase the unevenness of the wall thickness distribution between the connector 2 and the hub body 1 at the arc side 203. This makes it impossible to compensate for the inconsistent local shrinkage of the D-shaped connector 2 with a reasonable wall thickness range, resulting in a significant anisotropic shrinkage effect of the material in the connector 2 and reducing the assembly accuracy between the connector 2 and the motor shaft.

[0057] For example, the bottom wall thickness H3 of the second conformal groove 32 can be 1 mm, and the wall thickness H2 of the hub body 1 can be 2 mm. The ratio between the bottom wall thickness H3 of the second conformal groove 32 and the wall thickness H2 of the hub body 1 is 0.5. As another example, the bottom wall thickness H3 of the second conformal groove 32 can be 0.8 mm, and the wall thickness H2 of the hub body 1 can be 2 mm. The ratio between the bottom wall thickness H3 of the second conformal groove 32 and the wall thickness H2 of the hub body 1 is 0.4. Yet another example, the bottom wall thickness H1 of the first conformal groove 31 can be 1 mm, and the wall thickness H2 of the hub body 1 can be 2.2 mm. The ratio between the bottom wall thickness H1 of the first conformal groove 31 and the wall thickness H2 of the hub body 1 is 0.45. Those skilled in the art can select the bottom wall thickness of the second conformal groove 32 and the wall thickness of the hub body 1 based on actual processing requirements and the range of the ratio between the bottom wall thickness of the second conformal groove 32 and the wall thickness of the hub body 1 described above. No further limitations are imposed here.

[0058] An optional embodiment of the utility model, referring to... Figure 1 As shown, the ratio between the outer diameter of the second conformal groove 32 and the outer diameter of the arc side 203 of the side end face of the connector 2 is set to 1.15-1.6 times.

[0059] In this embodiment of the present invention, the outer edges of the second conformal groove 32 and the first conformal groove 31 are circular in shape along the radial cross-section of the hub body 1. That is, the outer edges of the second conformal groove 32 and the first conformal groove 31 are concentrically arranged and connected to each other. The arcuate side 203 of the connector 2 has a radial cross-section shape exceeding half a circle. The ratio between the outer diameter R1 of the second conformal groove 32 and the outer diameter R2 of the arcuate side 203 of the side end face of the connector 2 is set to 1.15-1.6 times. This can be understood as the ratio between the outer diameter of the second conformal groove 32 and the outer diameter of the arcuate side 203 of the side end face of the connector 2 being greater than or equal to 1.15, and the ratio between the outer diameter of the second conformal groove 32 and the outer diameter of the arcuate side 203 of the side end face of the connector 2 being less than or equal to 1.6. Within this ratio limit, it can be ensured that the bottom of the first conformal groove 31 and the bottom of the second conformal groove 32 extend a certain length radially along the hub body 1. Therefore, the difference in the thickness of the bottom of the first conformal groove 31 and the bottom of the second conformal groove 32 can reduce the anisotropic shrinkage effect of the material in the geometric structure of the connector 2. This reduces the elliptical deformation or warping deformation of the connector 2 caused by anisotropic shrinkage of the material.

[0060] If the ratio between the outer diameter R1 of the second conformal groove 32 and the outer diameter R2 of the arc side 203 of the side end face of the connector 2 is less than 1.15, then the opening width of the second conformal groove 32 is determined to be too narrow. If the ratio between the outer diameter R1 of the second conformal groove 32 and the outer diameter R2 of the arc side 203 of the side end face of the connector 2 is greater than 1.6, then the opening width of the second conformal groove 32 is determined to be too wide. When the groove width is too wide or too narrow, the stepped conformal groove 3 cannot compensate for the inconsistent local shrinkage of the D-type connector 2, resulting in a significant anisotropic shrinkage effect of the material of the connector 2, reducing the assembly accuracy of the connector 2 and the motor shaft.

[0061] For example, the outer diameter R1 of the second conformal groove 32 can be 15.13 mm, and the outer diameter R2 of the arc-shaped side 203 of the side end face of the connector 2 can be 13.13 mm. The ratio between the outer diameter R1 of the second conformal groove 32 and the outer diameter R2 of the arc-shaped side 203 of the side end face of the connector 2 is 1.15. As another example, the outer diameter R1 of the second conformal groove 32 can be 21 mm, and the outer diameter R2 of the arc-shaped side 203 of the side end face of the connector 2 can be 13.13 mm. The ratio between the outer diameter R1 of the second conformal groove 32 and the outer diameter R2 of the arc-shaped side 203 of the side end face of the connector 2 is 1.6. Yet another example, the outer diameter R1 of the second conformal groove 32 can be 18.75 mm, and the outer diameter R2 of the arc-shaped side 203 of the side end face of the connector 2 can be 15 mm. The ratio of the outer diameter R1 of the second conformal groove 32 to the outer diameter R2 of the arc side 203 of the side end face of the connector 2 is 1.25. Those skilled in the art can select the outer diameter of the second conformal groove 32 and the outer diameter of the arc side 203 of the side end face of the connector 2 based on actual processing requirements and the range defined by the ratio of the outer diameter of the second conformal groove 32 to the outer diameter of the arc side 203 of the side end face of the connector 2 described above; no further limitations are imposed here.

[0062] An optional embodiment of the utility model, referring to... Figure 1 , Figure 4 as well as Figure 6 As shown, the fan blade includes a hub body 1, a connector 2 integrally formed with the hub body 1, and multiple first reinforcing ribs 4. The connector 2 is located at the center of the hub body 1, and a first mounting hole 201 is formed at the center of the connector 2. Both the connector 2 and the first mounting hole 201 are D-shaped structures. A stepped conformal groove 3 is formed around the outer side of the connector 2 to support the roundness of the assembly between the connector 2 and the motor shaft. Multiple first reinforcing ribs 4 are located in the stepped conformal groove 3 and are distributed at equal angles about the central axis of the hub body 1. One end of each first reinforcing rib 4 is connected to the hub body 1, and the other end is connected to the connector 2.

[0063] In this embodiment of the invention, the fan blade may include a hub body 1 and a connector 2, wherein the hub body 1 and the connector 2 are an integral structure, for example, the hub body 1 and the connector 2 can be obtained by one-time injection molding. The radial cross-sectional shape of the hub body 1 may be circular, the connector 2 is located at the center of the hub body 1, and the center of the connector 2 is provided with a first mounting hole 201 that penetrates the connector 2 along the axial direction of the hub body 1.

[0064] Both the connector 2 and the first mounting hole 201 are D-shaped structures. In other words, the connector 2 can have a D-shaped annular cross-sectional shape along the radial direction of the hub body 1, and the first mounting hole 201 is also D-shaped along the radial direction of the hub body 1. Since both the connector 2 and the first mounting hole 201 are D-shaped, and the planar side 202 of the side end face of the connector 2 is parallel to the planar side 202 of the first mounting hole 201, the consistency of the hole wall thickness (also referred to as the wall thickness of the connector 2) can be improved. This reduces the elliptical deformation problem caused by anisotropic shrinkage of the material due to differences in the hole wall thickness of the first mounting hole 201, improving the roundness or assembly accuracy of the connector 2 and the motor shaft.

[0065] The outer side of the connector 2 is provided with a stepped conformal groove 3 surrounding the connector 2. Since the connector 2 and the hub body 1 are an integral structure, the stepped conformal groove 3 can be provided at the connection between the connector 2 and the hub body 1, wherein the stepped conformal groove 3 is provided around the outer end face of the connector 2. For example, the stepped conformal groove 3 has an annular structure that wraps around the connector 2 along the radial cross-section of the hub body 1. For example, the outer edge of the stepped conformal groove 3 along the radial cross-section of the hub body 1 is circular. Thus, by providing the stepped conformal groove 3, the wall thickness uniformity at the connection between the connector 2 and the hub body 1 can be improved, thereby further reducing the elliptical deformation problem caused by anisotropic shrinkage of the material due to the wall thickness difference at the connection between the connector 2 and the hub body 1, and improving the assembly accuracy of the connector 2 and the motor shaft.

[0066] Multiple first reinforcing ribs 4 are disposed in the stepped conformal groove 3 and are distributed at equal angles about the central axis of the wheel hub body 1. For example, some of the first reinforcing ribs 4 are located in the first conformal groove 31 and connected to the bottom of the first conformal groove 31, while other parts of the first reinforcing ribs 4 are located in the second conformal groove 32 and connected to the bottom of the second conformal groove 32. Those skilled in the art can determine the number of first reinforcing ribs 4 based on actual test results. For example, the number of first reinforcing ribs 4 can be 3, 4, 5, or 6, etc., and no further limitation is made here. One end of the first reinforcing rib 4 is connected to the wheel hub body 1, and the other end is connected to the connector 2. Thus, the first reinforcing rib 4 can be used to perform a secondary connection between the wheel hub body 1 and the connector 2, which can improve the structural strength of the connection between the connector 2 and the wheel hub body 1, thereby reducing the elliptical deformation caused by the anisotropic shrinkage of the material due to the wall thickness difference at the connection between the connector 2 and the wheel hub body 1. The first reinforcing rib 4, the wheel hub body 1, and the connecting piece 2 are an integral structure.

[0067] An optional embodiment of the utility model, referring to... Figure 4 , Figure 6 , Figure 7 as well as Figure 8 As shown, the fan blade also includes an extension 5 that is coaxially fixed with the connector 2. The extension 5 extends to the end face of the hub body 1 away from the connector 2 and has a second mounting hole 501 for assembly with the motor shaft.

[0068] In this embodiment of the invention, the fan blade may further include an extension 5 coaxially fixed to the connector 2. Coaxial fixing means that the connector 2 and the extension 5 are fixed together, and the central axis of the connector 2 coincides with the central axis of the extension 5. The extension 5 extends beyond the end face of the hub body 1 away from the connector 2. The extension 5 and the connector 2 are connected along the axial direction of the hub body 1, and the extension 5 has a second mounting hole 501 for assembling a motor shaft. The second mounting hole 501 communicates with the first mounting hole 201, and its radial cross-section along the hub body 1 is circular. Therefore, when assembling the fan blade and the hub body 1, the motor shaft can be inserted into the extension 5, and the D-axis region of the motor shaft can be inserted into the connector 2, thus forming an assembly between the connector 2 and the motor shaft. The extension 5 can extend the axial limiting length of the fan blade on the motor shaft, thereby improving the roundness of the assembly between the connector 2 and the motor shaft.

[0069] An optional embodiment of the utility model, referring to... Figure 7 and Figure 8 As shown, the fan blade includes a hub body 1, a connector 2 integrally formed with the hub body 1, an extension 5 coaxially fixed with the connector 2, and a plurality of second reinforcing ribs 6. The connector 2 is located at the center of the hub body 1, and a first mounting hole 201 is formed at the center of the connector 2. Both the connector 2 and the first mounting hole 201 are D-shaped structures. A stepped conformal groove 3 is formed around the outer side of the connector 2 to support the roundness of the assembly between the connector 2 and the motor shaft. The extension 5 extends beyond the end face of the hub body 1 away from the connector 2 and has a second mounting hole 501 for assembly with the motor shaft. The plurality of second reinforcing ribs 6 are located on the hub body 1 and are distributed at equal angles about the central axis of the extension 5.

[0070] In this embodiment of the invention, the fan blade may include a hub body 1 and a connector 2, wherein the hub body 1 and the connector 2 are an integral structure, for example, the hub body 1 and the connector 2 can be obtained by one-time injection molding. The radial cross-sectional shape of the hub body 1 may be circular, the connector 2 is located at the center of the hub body 1, and the center of the connector 2 is provided with a first mounting hole 201 that penetrates the connector 2 along the axial direction of the hub body 1.

[0071] Both the connector 2 and the first mounting hole 201 are D-shaped structures. In other words, the connector 2 can have a D-shaped annular cross-sectional shape along the radial direction of the hub body 1, and the first mounting hole 201 is also D-shaped along the radial direction of the hub body 1. Since both the connector 2 and the first mounting hole 201 are D-shaped, and the planar side 202 of the side end face of the connector 2 is parallel to the planar side 202 of the first mounting hole 201, the consistency of the hole wall thickness (also referred to as the wall thickness of the connector 2) can be improved. This reduces the elliptical deformation problem caused by anisotropic shrinkage of the material due to differences in the hole wall thickness of the first mounting hole 201, improving the roundness or assembly accuracy of the connector 2 and the motor shaft.

[0072] The outer side of the connector 2 is provided with a stepped conformal groove 3 surrounding the connector 2. Since the connector 2 and the hub body 1 are an integral structure, the stepped conformal groove 3 can be provided at the connection between the connector 2 and the hub body 1, wherein the stepped conformal groove 3 is provided around the outer end face of the connector 2. For example, the stepped conformal groove 3 has an annular structure that wraps around the connector 2 along the radial cross-section of the hub body 1. For example, the outer edge of the stepped conformal groove 3 along the radial cross-section of the hub body 1 is circular. Thus, by providing the stepped conformal groove 3, the wall thickness uniformity at the connection between the connector 2 and the hub body 1 can be improved, thereby further reducing the elliptical deformation problem caused by anisotropic shrinkage of the material due to the wall thickness difference at the connection between the connector 2 and the hub body 1, and improving the assembly accuracy of the connector 2 and the motor shaft.

[0073] Coaxial fixing can be understood as the connector 2 being fixed to the extension 5, with the central axis of the connector 2 coinciding with the central axis of the extension 5. The extension 5 extends beyond the end face of the hub body 1 away from the connector 2, wherein the extension 5 and the connector 2 are connected along the axial direction of the hub body 1, and the extension 5 has a second mounting hole 501 for assembling the motor shaft. The second mounting hole 501 communicates with the first mounting hole 201, and its radial cross-section along the hub body 1 is circular. Therefore, when assembling the fan blade and the hub body 1, the motor shaft can be inserted into the extension 5, and the D-axis region of the motor shaft can be inserted into the connector 2, thus forming an assembly between the connector 2 and the motor shaft. The extension 5 extends the axial limiting length of the fan blade on the motor shaft, thereby improving the roundness of the assembly between the connector 2 and the motor shaft.

[0074] Multiple second reinforcing ribs 6 are located on the hub body 1 and are distributed at equal angles about the central axis of the extension 5. For example, multiple second reinforcing ribs 6 are located on the end face of the hub body 1 away from the connector 2. Those skilled in the art can determine the number of second reinforcing ribs 6 according to actual design requirements. For example, the number of second reinforcing ribs 6 can be 3, 4, 5, 6, or 7, etc., without further limitation here. The second reinforcing ribs 6 can be connected to the hub body 1 and extend radially along the hub body 1. One end of the second reinforcing rib 6 is connected to the outer end face of the extension 5, thereby providing structural support through the second reinforcing rib 6. This improves the structural strength of the extension 5 and thereby further improves the structural stability of the connector 2.

[0075] In other embodiments, when a composite material of polypropylene and glass fiber is integrally injection molded, the glass fibers are aligned or oriented in a certain direction during the injection molding process. By adding the stepped conformal grooves 3, the distribution direction of the glass fibers in the connector 2 can be changed during the injection molding process, reducing shrinkage deformation of the part caused by uneven distribution direction and lowering the risk of inward shrinkage of the connector 2 during cooling. This improves the dimensional accuracy and structural stability of the connector 2. Furthermore, the oriented arrangement of the second reinforcing ribs 6 further reduces the risk of inward shrinkage of the connector 2 during cooling. This improves the machining accuracy of the integrally molded connector 2, enabling it to meet the tolerance requirements for assembly with the motor shaft, and improves the roundness of the assembly between the connector 2 and the motor shaft.

[0076] An optional embodiment of the utility model, referring to... Figure 4 , Figure 6 , Figure 7 as well as Figure 8 As shown, the fan blade also includes a rim 7, which is disposed on the end face of the hub body 1 away from the connector 2 and surrounds the extension 5. One end of the second reinforcing rib 6 is connected to the rim 7, and the other end is connected to the outer side of the connector 2.

[0077] In this embodiment of the invention, the fan blade may further include a surrounding edge 7, which is disposed on the end face of the hub body 1 away from the connector 2 and surrounds the extension 5. That is, the surrounding edge 7 has a circular cross-sectional shape along the radial direction of the hub body 1. On one hand, the surrounding edge 7 can provide structural support to one end of the second reinforcing rib 6, thereby increasing the support strength of the second reinforcing rib 6 for the extension 5. On the other hand, the surrounding edge 7 can connect to the edge of the hub body 1 and can be arranged circularly with the edge of the hub body 1, thereby expanding the side surface area of ​​the hub body 1 through the surrounding edge 7 to provide sufficient assembly area for the fan blade 8 to connect with the hub body 1.

[0078] In other embodiments, multiple blades 8 can be distributed at equal angles around the center of the hub body 1. Those skilled in the art can determine the number of blades 8 according to actual design requirements. For example, the number of blades 8 can be 3, 4, 5, 6, or 7, etc., without further limitation here.

[0079] In some embodiments, the fan blade may further include a flange located on the end face of the hub body 1 near the connector 2, and the flange may be circularly arranged with the edge of the hub body 1. That is, the flange can be used to further increase the side surface area of ​​the hub body 1 to facilitate the assembly of the blade 8.

[0080] In one optional embodiment of the utility model, the hub body 1, the extension 5, the second reinforcing rib 6, and the rim 7 are an integral structure.

[0081] In this embodiment of the utility model, the hub body 1, the connector 2, the extension 5, the first reinforcing rib 4, the second reinforcing rib 6, and the rim 7 are all integral structures. That is to say, the fan blade can be obtained by injection molding in one step, which simplifies the production process of the fan blade and reduces the production cost of the fan blade.

[0082] In summary, this utility model discloses a fan blade, which may include a hub body 1 and a connector 2 integrally formed with the hub body 1. The connector 2 is located at the center of the hub body 1, and a first mounting hole 201 is formed at the center of the connector 2. Both the connector 2 and the first mounting hole 201 are D-shaped structures. A stepped conformal groove 3 is formed around the outer side of the connector 2 to support the roundness of the assembly between the connector 2 and the motor shaft. Thus, by directly forming the D-shaped first mounting hole 201 on the fan blade through a one-time injection molding, the assembly tolerance requirements are met, and the production process is simplified and the production cost is reduced. Furthermore, by introducing the stepped conformal groove 3 on the outer side of the connector 2, the geometry of the connector 2 can be optimized, thereby reducing the cooling shrinkage deformation of the connector 2 caused by material thickness differences.

[0083] This utility model discloses a fan, which may include the fan blades described in any of the above utility model embodiments.

[0084] In this embodiment of the invention, the fan may include, but is not limited to, a floor fan, a wall-mounted fan, or a table fan. The fan may include a hub body 1 and a connector 2 integrally formed with the hub body 1. The connector 2 is located at the center of the hub body 1, and a first mounting hole 201 is formed at the center of the connector 2. Both the connector 2 and the first mounting hole 201 are D-shaped structures. A stepped conformal groove 3 is formed around the outer side of the connector 2 to support the roundness of the assembly between the connector 2 and the motor shaft. Thus, by directly forming the D-shaped first mounting hole 201 on the fan blade through a single injection molding process, the assembly tolerance requirements are met, while also simplifying the production process and reducing production costs. Furthermore, by introducing the stepped conformal groove 3 on the outer side of the connector 2, the geometry of the connector 2 can be optimized, thereby reducing the cooling shrinkage deformation of the connector 2 due to material thickness differences.

[0085] In summary, this utility model discloses a fan blade and a fan. This utility model embodiment may include a hub body 1 and a connector 2 integrally formed with the hub body 1. The connector 2 is located at the center of the hub body 1, and a first mounting hole 201 is formed at the center of the connector 2. Both the connector 2 and the first mounting hole 201 are D-shaped structures. A stepped conformal groove 3 is formed around the outer side of the connector 2 to support the roundness of the assembly between the connector 2 and the motor shaft. Thus, by directly forming the D-shaped first mounting hole 201 on the fan blade through a single injection molding process, the assembly tolerance requirements are met, while also simplifying the production process and reducing production costs. Furthermore, by introducing the stepped conformal groove 3 on the outer side of the connector 2, the geometry of the connector 2 can be optimized, thereby reducing the cooling shrinkage deformation of the connector 2 due to material thickness differences.

[0086] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0087] It will be readily apparent to those skilled in the art that any combination of the above embodiments is feasible. Therefore, any combination of the above embodiments is an implementation scheme of this utility model. However, due to space limitations, this specification will not describe them in detail here.

[0088] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0089] Similarly, it should be understood that, in order to simplify the present invention and aid in understanding one or more of the various aspects of the invention, in the description of exemplary embodiments of the present invention above, various features of the present invention are sometimes grouped together in a single embodiment, figure, or description thereof.

[0090] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

Claims

1. A wind turbine blade, characterized in that, The fan blade includes a hub body (1) and a connector (2) integrally formed with the hub body (1). The connector (2) is located at the center of the hub body (1), and a first mounting hole (201) is provided at the center of the connector (2). Both the connector (2) and the first mounting hole (201) are D-shaped structures. A stepped conformal groove (3) is provided on the outer side of the connector (2) around the connector (2).

2. The wind turbine blade according to claim 1, characterized in that, The stepped conformal groove (3) includes: The first conformal groove (31) is located on the planar side (202) of the side end face of the connector (2); The second conformal groove (32) is located on the arc side (203) of the side end face of the connector (2) and is connected to both ends of the first conformal groove (31). The groove depth of the second conformal groove (32) is less than the groove depth of the first conformal groove (31).

3. The fan blade according to claim 2, characterized in that, The ratio between the bottom wall thickness of the first conformal groove (31) and the wall thickness of the hub body (1) is set within 0.9-1.

4. The fan blade according to claim 2, characterized in that, The ratio between the groove depth of the first conformal groove (31) and the wall thickness of the hub body (1) is set within 0.7-2.

5. The fan blade according to claim 2, characterized in that, The ratio between the bottom wall thickness of the second conformal groove (32) and the wall thickness of the hub body (1) is set within 0.4-0.

5.

6. The fan blade according to claim 2, characterized in that, The ratio between the outer diameter of the second conformal groove (32) and the outer diameter of the arc side (203) of the side end face of the connector (2) is set to 1.15-1.6 times.

7. The wind turbine blade according to claim 1, characterized in that, The fan blade also includes a plurality of first reinforcing ribs (4), which are located in the stepped conformal groove (3) and are distributed at equal angles about the central axis of the hub body (1). One end of the first reinforcing rib (4) is connected to the hub body (1), and the other end is connected to the connector (2).

8. The wind turbine blade according to claim 1, characterized in that, The fan blade also includes an extension (5) that is coaxially fixed with the connector (2), wherein the extension (5) extends to the end face of the hub body (1) away from the connector (2) and has a second mounting hole (501) for assembly with the motor shaft.

9. The wind turbine blade according to claim 8, characterized in that, The wind blade also includes a plurality of second reinforcing ribs (6), which are located on the hub body (1) and are distributed at equal angles about the central axis of the extension (5).

10. The wind turbine blade according to claim 9, characterized in that, The fan blade also includes a rim (7), which is disposed on the end face of the hub body (1) away from the connector (2) and surrounds the extension (5). One end of the second reinforcing rib (6) is connected to the rim (7), and the other end is connected to the outer side of the connector (2).

11. The wind turbine blade according to claim 10, characterized in that, The hub body, extension (5), second reinforcing rib (6), and rim (7) are an integral structure.

12. A fan, characterized in that, The fan includes the blades as described in any one of claims 1-11.

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