Fan blade structure and fan

Abstract

The utility model provides a fan blade structure and a fan, and belongs to the technical field of fans, the fan blade structure comprises a fan blade body, and an axis body used for being connected with a motor is arranged in the fan blade body. A protection structure is arranged at one end of the axis body; when the fan blade body is installed on the motor, one end of the protection structure is connected with an end cover of the motor. The fan blade structure can form a protection space outside the end cover of the motor, so that the sealing performance between the fan blade and the motor is greatly improved, and the protection grade of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a blade structure and a fan. Background Art

[0002] In the fields of animal husbandry, breeding, ventilation and air change, etc., the stability and protection level of fans are crucial for the equipment performance and service life. However, in the existing fans, usually the blade body is connected to the motor through a rotating shaft, and its protection design mainly relies on the blade end cover and related structures supporting the end cover. This protection method results in a generally low protection level of the fan, such as IP55, IP56, IP66, etc. Although these levels of protection provide a certain degree of protection against dust and water for the fan, in the increasingly complex application environment, these protection levels have gradually become difficult to meet the actual needs. Especially in extreme working conditions such as humidity, water spraying, on-site disinfection, and cleaning, the limitations of the protection structure of the existing fans become more prominent.

[0003] With the rapid development of industries such as animal husbandry and breeding, the market has put forward higher requirements for the durability, reliability, and environmental protection of equipment. A fan motor with a high protection level can operate stably in a harsh environment, thereby reducing maintenance costs and downtime and improving production efficiency.

[0004] Therefore, it is necessary to improve the existing fans to overcome the defects of the prior art. Summary of the Utility Model

[0005] To overcome the problems existing in the related art, one of the purposes of the utility model is to provide a blade structure, which can form a protection space outside the end cover of the motor, thereby greatly improving the sealing performance between the blade and the motor and enhancing the protection level of the motor.

[0006] A blade structure includes a blade body, and an axis body for connecting with a motor is arranged in the blade body;

[0007] One end of the axis body is provided with a protection structure; when the blade body is installed on the motor, one end of the protection structure is in contact with the end cover of the motor.

[0008] In actual application, when the blade structure is installed on the motor, a protection space can be formed between the end cover of the motor and the motor shaft through the protection structure, and this protection space acts together with the shaft extension end of the motor to effectively protect the motor, thereby enhancing the protection level of the motor.

[0009] In a preferred technical solution of the utility model, the protection structure includes a protective cover, and the protective cover is arranged at one end of the axis body and is coaxially arranged with the axis body;

[0010] A protective space is formed inside the protective cover, and the inner diameter of the protective space is larger than the outer diameter of the shaft body.

[0011] In practical applications, the cross-section of the protective cover is designed to be circular.

[0012] In a preferred technical solution of the present utility model, the protective cover and the shaft body are integrally formed; or,

[0013] The protective cover is detachably arranged on the shaft body.

[0014] This application provides two preferred design schemes for the protective cover. In the first scheme, the protective cover and the shaft body are integrally formed. This design method can enhance the stability of the overall structure, reduce the uncertainty during the assembly process, and thus improve the reliability and durability of the product.

[0015] In the second scheme, the protective cover is designed to be detachably arranged on the shaft body. The advantage of this design method lies in its flexibility and maintainability. When the protective cover is damaged or needs to be cleaned, the user can easily remove it from the shaft body for replacement or cleaning without replacing the entire fan blade structure, thereby reducing the maintenance cost.

[0016] In a preferred technical solution of the present utility model, the inner wall of the protective cover is arranged at an angle α with the axis of the shaft body, where 5° < α < 15°.

[0017] Specifically, the inner wall of the protective cover adopts an inclined surface form. During use, if the accumulated water of the motor enters the inner wall of the protective cover along the vertical surface, under the action of its own gravity, the accumulated water will flow down along the circumference of the inner wall of the cavity. At the same time, when the motor runs, the water droplets on the inner wall of the protective cover are affected by the centrifugal force and run away from the circumference along the axis, and the inclined surface increases the centrifugal throwing. The design of the angle α requires selecting the largest possible angle within the allowable range of the material wall thickness and space. This enables the water droplets and water flow to achieve water throwing by their own gravity and centrifugal force, and at the same time accelerates the air exchange in the cavity.

[0018] In a preferred technical solution of the present utility model, a convex edge is provided at one end of the protective cover far from the blade body. The convex edge protrudes outward from the edge of the protective cover. An abutting surface for connecting with the motor end cover is provided on one side of the convex edge, and the abutting surface is adapted to the outer wall of the motor end cover;

[0019] A plurality of grooves are provided on the abutting surface. The length direction of each groove is arranged from the inner diameter to the outer diameter of the abutting surface, and the plurality of grooves are arranged on the abutting surface along the circumferential direction of the abutting surface.

[0020] The convex edge is matched with the outer wall of the end cover of the motor, so that the sealing performance of the protection space is good, thereby improving the protection capability of the fan blade structure.

[0021] In a preferred technical solution of the utility model, the axis of the groove and the edge of the abutment surface are set at an angle β, wherein 5°<β<15°.

[0022] When the motor is running, if the groove is subjected to high-pressure washing or oblique rainfall, the drainage effect will be greatly enhanced, thereby improving the protection performance of the motor.

[0023] In a preferred technical solution of the utility model, a corner groove is provided at the connection between the convex edge and the protective cover, and the corner groove is provided at the connection between the convex edge and the protective cover along the circumference of the protective cover.

[0024] When the motor stops running, water droplets on the outer wall of the protective cover are easily accumulated at the corners due to surface tension. The design of the corner groove can play a role in guiding water, so that the water droplets on the outer wall of the protective cover flow downward under their own weight.

[0025] In a preferred technical solution of the utility model, the inner wall of the protective cover is provided with a spiral groove, and the spiral groove is arranged on the inner wall of the protective cover along the axial direction of the protective cover.

[0026] The direction of rotation of the spiral groove is consistent with that of the motor. The spiral groove can increase the centrifugal force of the inner wall of the protective cover when the motor is running, increase the speed of water droplets and water flow, and play a role in diversion. The design of the waterway width and spiral angle takes into account the water inflow of the inner cavity and the load speed. The width of the waterway must meet the maximum water inflow and water outflow speed, and the spiral angle is 25°~40°. If the load speed is high, the angle can be appropriately reduced.

[0027] The second purpose of the present utility model is to provide a fan, including a motor and the fan blade structure as described above, wherein the motor is provided with a motor shaft and an end cover, and the fan blade structure is arranged on the motor shaft; and when the fan blade structure is arranged on the motor shaft, the protective structure is connected to the end cover.

[0028] The fan utilizes the protective structure on the fan blade structure to protect the end cover of the motor, thereby effectively improving the protection capability of the motor and extending the service life of the motor.

[0029] In a preferred technical solution of the utility model, one end of the motor shaft passes through the end cover and is connected to the axial body, and a plurality of drainage grooves are arranged on the motor shaft. The drainage grooves are arranged in a ring shape on the outer wall of the motor shaft, and the drainage grooves are located between the end cover and the fan blade structure.

[0030] The function of the drainage groove can further protect the motor and improve the protection level of the motor.

[0031] The beneficial effects of the present utility model are as follows:

[0032] A blade structure provided by the present utility model includes a blade body, and an axle center body for connecting with the motor is arranged in the blade body. One end of the axle center body is provided with a protection structure; when the blade body is installed on the motor, one end of the protection structure is in contact with the end cover of the motor. Specifically, the protection structure is an annular cover with a certain space inside, which can be in close contact with the end cover of the motor. When the blade body is installed on the motor, this annular cover will be in contact with the outer wall of the end cover of the motor, thereby forming a closed protection space between the end cover of the motor and the motor shaft. During actual operation, this protection space, together with the shaft extension end of the motor, provides comprehensive protection for the motor, effectively preventing external environmental factors such as dust and water vapor from invading the interior of the motor and improving the protection level of the motor. This can not only extend the service life of the motor but also ensure the stable operation of the motor in harsh environments.

[0033] The present application also provides a fan including a motor and the blade structure as described above. This fan has excellent protection ability, enabling the fan to maintain an excellent working state in various environments. At the same time, due to the protection design of the blade structure, the maintenance cycle of the fan is greatly extended, which helps to reduce the operation cost of the fan and improve the reliability of the equipment. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of the existing cooperation between the blade body and the motor shaft provided by the present utility model;

[0035] Figure 2 is a schematic structural diagram of the blade structure provided in the embodiment of the present utility model;

[0036] Figure 3 is Figure 2 a cross-sectional view of the blade structure in

[0037] Figure 4 is a schematic diagram of the blade structure with a convex edge on the protective cover provided in the embodiment of the present utility model;

[0038] Figure 5 is Figure 4 a cross-sectional view of the blade structure in

[0039] Figure 6 is Figure 5 a partial enlarged view of part A in

[0040] Figure 7 is Figure 4Schematic diagram of the structure on one side of the convex edge of the wind blade structure;

[0041] Figure 8 is Figure 7 Partial enlarged view of point B in;

[0042] Figure 9 Schematic diagram of the arrangement of the spiral groove in the wind blade structure provided in the embodiment of the present utility model;

[0043] Figure 10 Schematic diagram of the structure of the fan provided in the embodiment of the present utility model;

[0044] Figure 11 Cross-sectional view of the fan provided in the embodiment of the present utility model;

[0045] Figure 12 is Figure 11 Partial enlarged view of point C in.

[0046] Reference numerals:

[0047] 1, wind blade body; 11, shaft center body; 2, protection structure; 21, protection space; 22, convex edge; 23, abutting surface; 24, groove; 25, corner groove; 26, spiral groove; 100, motor shaft; 110, end cover; 120, drainage groove. Detailed implementation manners

[0048] The preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present utility model more thorough and complete, and to fully convey the scope of the present utility model to those skilled in the art.

[0049] In the fields of animal husbandry, breeding, ventilation and air change, etc., the stability and protection level of the fan are crucial for the equipment performance and service life. However, in existing fans, usually the wind blade and the motor are connected through a rotating shaft, and its protection design mainly relies on the wind blade end cover and related structures matching the end cover. This protection method results in a generally low protection level of the fan, such as IP55, IP56, IP66, etc. Although these levels of protection provide a certain degree of protection against dust and water for the fan, in an increasingly complex application environment, these protection levels have gradually become difficult to meet the actual needs. Especially in extreme working conditions such as humidity, water spraying, on-site disinfection, and cleaning, the limitations of the existing protection structures of the fan are becoming more and more prominent.

[0050] With the rapid development of industries such as animal husbandry and aquaculture, the market has put forward higher requirements for the durability, reliability, and environmental protection of equipment. A fan motor with a high protection level can operate stably in harsh environments, thereby reducing maintenance costs and downtime and improving production efficiency.

[0051] Based on this, the present application provides a wind blade structure.

[0052] Embodiment 1

[0053] As Figures 1-9 shown, a wind blade structure provided in this embodiment includes a wind blade body 1, and an axle center body 11 for connecting with a motor is arranged in the wind blade body 1;

[0054] One end of the axle center body 11 is provided with a protection structure 2; when the wind blade body 1 is installed on the motor, one end of the protection structure 2 is in contact with the end cover 110 of the motor.

[0055] Specifically, the wind blade body 1 is the main part of the wind blade structure and is used to convert the output of the motor into wind energy. The axle center body 11 is located at the center of the wind blade body 1 and serves as a bridge for connecting with the motor to ensure that the wind blade can rotate stably under the drive of the motor. In actual applications, a shaft hole is provided on the axle center body 11, and the shaft hole is used to connect with the motor shaft 100 of the motor.

[0056] Specifically, the shaft hole can be connected to the motor shaft 100 through a key. This connection method uses one or more keys to transmit torque. The key can be inserted into the corresponding slots on the axle center body 11 and the motor shaft 100 to ensure synchronous rotation between the two. Or the shaft hole is further fixed to the connection between the axle center body 11 and the motor shaft 100 through a lock nut, a lock washer, etc. to prevent loosening during operation.

[0057] The protection structure 2 is an annular cover with a certain space inside, which can be in close contact with the end cover 110 of the motor. It is necessary to ensure that the inner diameter of the inner wall of the annular cover is larger than the outer diameter of the axle center body 11.

[0058] When the wind blade body 1 is installed on the motor, the annular cover naturally contacts the outer wall of the end cover 110 of the motor, thereby forming a closed protection space 21 between the end cover 110 of the motor and the motor shaft 100. This protection space 21 and the shaft extension end of the motor act together to form an effective barrier that can resist the erosion of harmful factors such as dust and water vapor in the external environment on the inside of the motor.

[0059] In practical applications, this design significantly improves the protection level of the motor. Due to the existence of the protection space 21, the key components of the motor are given additional protection, thereby reducing the risk of damage caused by environmental factors. This not only helps to extend the service life of the motor but also ensures that the motor can still operate stably when facing a harsh environment.

[0060] Embodiment 2

[0061] This embodiment is an improvement based on Embodiment 1.

[0062] As Figures 1-9 shown, in this embodiment, the protection structure 2 includes a protective cover, and the protective cover is arranged at one end of the shaft body 11 and is coaxially arranged with the shaft body 11;

[0063] A protection space 21 is formed inside the protective cover, and the inner diameter of the protection space 21 is larger than the outer diameter of the shaft body 11.

[0064] In actual applications, the cross-section of the protective cover is designed to be circular.

[0065] In this embodiment, the protective cover and the shaft body 11 are integrally formed; or,

[0066] The protective cover is detachably arranged on the shaft body 11.

[0067] This application provides two design schemes for the protective cover. In the first scheme, the protective cover and the shaft body 11 are integrally formed. This design method can enhance the stability of the overall structure, reduce the uncertainty during the assembly process, and thus improve the reliability and durability of the product. The integral protective cover and the impeller body 1 are integrally formed, and there is no seam or connection point between them. In this implementation method, the impeller body 1 is made of high-strength plastic or metal.

[0068] This embodiment also provides a manufacturing method for the protective cover and the impeller body 1. For example, the protective cover and the impeller body 1 can be integrally die-cast by the upper and lower mold clamping method. Or the whole piece is integrally die-cast and then the non-critical structural materials are removed by turning to achieve weight reduction and cost control. Under the condition of the same protection requirements, this integral forming design can reduce one material and one assembly process, improving the production efficiency.

[0069] In the second solution, the protective cover is designed to be detachably arranged on the shaft body 11. For example, it can be assembled together by bolts, buckles or other connection means. The advantage of this design is its flexibility and maintainability. When the protective cover is damaged or needs to be cleaned, the user can easily remove it from the shaft body 11 for replacement or cleaning without replacing the entire blade structure, thus reducing the maintenance cost. If a certain part is damaged, only that part needs to be replaced, reducing the maintenance cost.

[0070] The split design of the protective cover can be more easily adjusted to adapt to the installation requirements of motors with different sizes and shapes. This flexibility enables the protective structure 2 of this application to be widely applied to various types of motors without the need for a large amount of customization or modification.

[0071] This embodiment also provides an implementation manner in which the protective cover is threadedly connected to the shaft body 11 to achieve a detachable design of the protective cover. Specifically: a section of external thread is provided on the outer surface of the shaft body 11, and a corresponding section of internal thread is provided on the inner surface of the protective cover. By rotating the protective cover, it can be tightly connected to the shaft body 11 to form a stable protective structure 2.

[0072] This threaded connection design has multiple advantages. First, it provides reliable connection strength, ensuring that the protective cover will not loosen or fall off during the operation of the motor. Second, the threaded connection has self-locking property, and can maintain the connection stability even without additional locking devices. This connection method also makes the disassembly and replacement of the protective cover very simple, and the user can easily complete it by rotating operation. More preferably, in the implementation manner of the threaded connection, dust is not easily introduced into the protective structure 2 from the connection between the protective cover and the shaft body 11.

[0073] Embodiment 3

[0074] This embodiment is an improvement based on Embodiment 1.

[0075] As Figures 1-9 shown, in this embodiment, the inner wall of the protective cover is arranged at an angle α with the axis of the shaft body 11, where 5° < α < 15°.

[0076] Specifically, the inner wall of the protective cover adopts an inclined surface. During use, if the accumulated water of the motor enters the inner wall of the protective cover along the vertical surface, the accumulated water will flow down along the circumference of the inner wall of the chamber under the action of its own gravity. At the same time, when the motor is running, the water droplets on the inner wall of the protective cover are subjected to centrifugal force and deviate from the circumference along the axis, and the inclined surface increases the centrifugal throw. The design of the angle α requires the maximum angle to be selected within the range allowed by the material wall thickness and space. In this way, the water droplets and water flow can be thrown off by their own weight and centrifugal force, while accelerating the air exchange in the cavity. In addition, selecting the maximum angle α within the range allowed by the material wall thickness and space can help to optimize space utilization while ensuring the structural strength, making the design of the protective cover more compact and reasonable.

[0077] The beveled design of the inner wall of the protective cover not only helps to drain the accumulated water, but also improves the heat dissipation effect of the motor, because the faster air exchange helps to remove the heat generated by the motor. In addition, this design reduces the risk of corrosion of the internal parts of the motor by accumulated water, thereby extending the service life of the motor.

[0078] Example 4

[0079] This embodiment is improved on the basis of embodiment 1.

[0080] like Figures 1-9 As shown, in this embodiment, a convex edge 22 is provided at one end of the protective cover away from the fan blade body 1, and the convex edge 22 protrudes outward from the edge of the protective cover, and a contact surface 23 connected to the motor end cover 110 is provided on one side of the convex edge 22, and the contact surface 23 is adapted to the outer wall of the end cover 110 of the motor;

[0081] A plurality of grooves 24 are disposed on the abutting surface 23 , and the length direction of each groove 24 is arranged along the direction from the inner diameter to the outer diameter of the abutting surface 23 , and the plurality of grooves 24 are arranged on the abutting surface 23 along the circumferential direction of the abutting surface 23 .

[0082] Specifically, the cross section of the protective cover is circular, the width direction of the convex edge 22 is arranged along the radial direction of the protective cover, and the abutting surface 23 is arranged on the convex edge 22 at an end away from the fan blade body 1. The shape of the abutting surface 23 can be designed according to the shape of the outer wall of the end cover 110 of the motor. For example, if the outer wall of the end cover 110 of the motor presents a certain arc shape, the cross section is also called an arc design, so that the abutting surface 23 can fit with the outer wall of the end cover 110 of the motor.

[0083] The design of the abutting surface 23 on the convex edge 22 being matched with the outer wall of the end cover 110 of the motor makes the sealing of the protection space 21 good, thereby improving the protection capability of the fan blade structure.

[0084] Specifically, the design of the groove 24 on the abutting surface 23 enables the blade structure to greatly enhance drainage during use in the case of high-pressure flushing or oblique incidence of heavy rainfall. The groove 24 has a certain angle, that is, the axis of the groove 24 is not parallel to the diameter direction of the protective cover, and the angle inclination direction of the groove 24 is opposite to the rotation direction of the motor used, so as to spread and throw out the water droplets outward in the largest range.

[0085] In a better embodiment, the included angle β between the axis of the groove 24 and the edge of the abutting surface 23 is set, where 5° < β < 15°. The design of the angle β needs to be implemented according to the application scenario of the blade structure. In this application, the included angle β between the axis of the groove 24 and the edge of the abutting surface 23 is set between 5° and 15°, which is determined based on the comprehensive consideration of the water impact volume and the motor speed in actual application. In a better embodiment, the angle of β is 10°.

[0086] The groove depth, groove width and included angle of the groove 24 in this application are all specially designed. In actual application, the design of the groove depth, groove width and included angle β of the groove 24 needs to consider the water impact volume and the motor speed. When the protective space 21 makes a circular motion following the load, the water droplets are thrown out by centrifugal force.

[0087] The following provides a specific implementation manner of the design of the groove 24 on the abutting surface 23:

[0088] Number of grooves 24: There are 12 grooves 24 evenly distributed on the abutting surface 23.

[0089] Length of groove 24: The length of each groove 24 is measured from the inner diameter to the outer diameter direction of the abutting surface 23 and is set to 10 mm.

[0090] Width of groove 24: The width of the groove 24 is set to 2 mm to ensure sufficient drainage space while maintaining the structural strength of the abutting surface 23.

[0091] Depth of groove 24: The depth of the groove 24 is set to 1 mm. This depth can not only ensure the drainage effect but also will not be too deep to affect the flatness of the abutting surface 23.

[0092] Included angle β of groove 24: The included angle β between the axis of the groove 24 and the edge of the abutting surface 23 is set to 8°. This angle is determined after comprehensively considering the water impact volume, the motor speed and the drainage effect to ensure that the water droplets can be spread and thrown out outward in the largest range.

[0093] Embodiment 5

[0094] This embodiment is an improvement based on Embodiment 4.

[0095] As Figures 1-9As shown in the figure, in this embodiment, a corner groove 25 is added to the protective structure 2 with a groove 24 to improve the protection ability of the blade structure of the present application.

[0096] A corner groove 25 is provided at the connection between the convex edge 22 and the protective cover. The corner groove 25 is arranged circumferentially along the protective cover at the connection between the convex edge 22 and the protective cover, especially at the connection corner between the convex edge 22 and the protective cover.

[0097] In actual application, the blade structure is installed on the motor shaft 100 of the motor. When the motor stops running, the water droplets on the outer wall of the protective cover are affected by the surface tension and tend to accumulate water at the corners. The design of the corner groove 25 can play a role in guiding water, so that the water droplets on the outer wall of the protective cover flow downward under their own weight, thus solving the problem of water accumulation at the corners due to the surface tension of the water droplets on the outer wall of the protective cover. This design further enhances the protection ability of the blade structure. Especially in a humid or rainy environment, it can effectively prevent water droplets from damaging the blade structure.

[0098] Specifically, the cross-section of the corner groove 25 in this embodiment can be V-shaped, U-shaped or rectangular; the V-shaped groove can more effectively guide water droplets to flow along the groove edge due to its sharp bottom; while the U-shaped groove has a larger capacity and can hold more accumulated water, and its smooth side walls can also reduce the water flow resistance.

[0099] In actual application, the size design of the corner groove 25 needs to consider multiple factors, including the material thickness, structural strength of the protective cover, and the expected drainage effect, etc. Generally speaking, the depth of the corner groove 25 should not be too shallow to ensure that it can hold a certain amount of accumulated water; at the same time, it should not be too deep to avoid affecting the overall structure of the protective cover. In terms of width, the corner groove 25 should be wide enough to guide water droplets to flow out smoothly, but also avoid being too wide to cause structural weakening.

[0100] Specifically, the depth of the corner groove 25 can be between 1 and 3 millimeters, and the width can be between 2 and 3 millimeters.

[0101] Embodiment 6

[0102] This embodiment is an improvement based on Embodiment 5.

[0103] As Figures 1-9 As shown in the figure, in this embodiment, a convex edge 22 is provided at one end of the protective cover away from the blade body 1. The convex edge 22 protrudes outward from the edge of the protective cover. An abutting surface 23 that abuts against the motor end cover 110 is provided on one side of the convex edge 22. The abutting surface 23 is adapted to the outer wall of the motor end cover 110;

[0104] A plurality of grooves 24 are provided on the abutting surface 23, and the length direction of each groove 24 is arranged along the inner diameter to the outer diameter direction of the abutting surface 23, and the plurality of grooves 24 are arranged on the abutting surface 23 along the circumferential direction of the abutting surface 23.

[0105] Moreover, a corner groove 25 is provided at the connection between the convex edge 22 and the protective cover, and the corner groove 25 is arranged along the circumferential direction of the protective cover at the connection between the convex edge 22 and the protective cover.

[0106] Preferably, a spiral groove 26 is provided on the inner wall of the protective cover, and the spiral groove 26 is arranged on the inner wall of the protective cover along the axial direction of the protective cover.

[0107] Specifically, the spiral groove 26 is designed in a spiral shape on the inner wall of the protective cover, and the width direction of the spiral groove 26 extends along the axial direction of the protective cover.

[0108] The rotation direction of the spiral groove 26 is the same as the rotation direction of the motor. The spiral groove 26 can increase the centrifugal force on the inner wall of the protective cover during the operation of the motor, strengthen the throwing speed of water droplets and water flow, and play a role in guiding the flow. The width and spiral angle of the spiral groove 26 are designed considering the water inflow volume in the inner cavity and the load rotation speed. The width of the spiral groove 26 needs to meet the water outlet speed of the maximum water inflow volume, and the spiral angle is 25° - 40°. If the rotation speed of the motor is relatively high, the spiral angle of the spiral groove 26 can be appropriately reduced.

[0109] It should be noted that the spiral angle of the spiral groove 26 in the present application refers to the angle formed when the spiral line rotates around its axis for one week, and it determines the shape and lead of the spiral groove 26.

[0110] The spiral angle of the spiral groove 26 is closely related to the lead. The lead refers to the arc length corresponding to the angle through which the spiral line rotates when it advances one pitch along its axis direction. Therefore, the larger the spiral angle, the longer the lead. In practical applications, the selection of the lead should be comprehensively considered according to factors such as the flow rate and pressure of the fluid and the size of the spiral groove 26.

[0111] When designing the spiral angle of the spiral groove 26, certain design principles need to be followed. First of all, the spiral angle should be opposite to the rotation direction of the motor that cooperates with the blade structure to ensure that the fluid can be thrown out in the spiral groove 26. Secondly, the size of the spiral angle should be determined according to specific requirements, which should not only meet the functional requirements but also consider the processing difficulty and cost. Finally, during the design process, attention should also be paid to maintaining the uniformity and consistency of the spiral groove 26 to avoid problems such as deviation or deformation.

[0112] This embodiment provides a specific design method for the spiral groove 26:

[0113] Depth: The depth of the spiral groove 26 is 3 mm. This depth can not only meet the diversion requirements but also will not have an adverse impact on the structure of the protective cover.

[0114] Spiral angle and lead: The spiral angle of the spiral groove 26 is 10 mm advance per revolution (i.e., the lead is 10 mm). This lead can not only ensure the smooth flow of the fluid in the spiral groove 26 but also will not cause excessive processing difficulty and cost.

[0115] Embodiment 7

[0116] As Figures 1-12 shown, this embodiment provides a fan, which includes a motor and the blade structure as described above. A motor shaft 100 and an end cover 110 are provided on the motor, and the blade structure is arranged on the motor shaft 100; and when the blade structure is arranged on the motor shaft 100, the protective structure 2 is connected to the end cover 110.

[0117] Specifically, the motor includes a stator, a rotor, and bearings. The stator is the stationary part of the motor and is fixed on the outer shell of the motor. The rotor is the rotating part of the motor, and it is installed in the inner cavity of the stator through bearings. The motor shaft 100 is fixed in the rotor and rotates with the rotor.

[0118] In this embodiment, one end of the motor shaft 100 penetrates through the end cover 110 and is connected to the shaft center body 11. A plurality of drainage grooves 120 are provided on the motor shaft 100. The drainage grooves 120 are annularly arranged on the outer wall of the motor shaft 100, and the drainage grooves 120 are located between the end cover 110 and the blade structure.

[0119] The function of the drainage grooves 120 can play a further protective role for the motor and improve the protection level of the motor. By adding the drainage grooves 120, the moisture or impurities that may penetrate into the interior of the motor can be drained away in time, avoiding interference or damage to the normal operation of the motor, thereby improving the protection level of the motor. Due to the existence of the drainage grooves 120, the operating environment of the motor is improved, and the erosion effect of moisture and impurities on the motor is greatly weakened. This will help to extend the service life of the motor and thus extend the service life of the entire fan.

[0120] The fan of the present application forms multiple protective structures 2 through the cooperation of the blade structure and the motor, thereby improving the protection reliability of the motor. Among them, the multiple protective structures 2 are specifically:

[0121] The first layer: the blade body 1; after the blade body 1 is fixed on the motor shaft 100, it can play a certain protective role for the motor;

[0122] The second layer: the protective cover; when the blade structure is fixed, the protective cover forms a second protective structure 2 on the side of the motor end cover 110;

[0123] The third layer: the corner groove 25; the corner groove 25 on the impeller structure forms the third layer of protection for the motor;

[0124] The fourth layer: the cooperation between the abutting surface 23 and the outer wall of the end cover 110, and the design of the groove 24;

[0125] The fifth layer: the design of the spiral groove 26 on the inner wall of the protective cover;

[0126] The sixth layer: the design of the drainage groove 120;

[0127] The seventh layer: the seal ring and oil seal structure at the bearing of the motor.

[0128] The mutual cooperation of the above-mentioned multiple protection structures 2 can effectively improve the protection ability of the motor, and can effectively improve the protection level of the whole machine without adding new materials and assembly, so that the fan can meet the use requirements under extreme working conditions.

[0129] In addition, it should be noted that using words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above words have no special meaning, so it cannot be understood as a limitation on the protection scope of this application.

[0130] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fan blade structure, comprising a fan blade body (1), wherein the fan blade body (1) is provided with an axis body (11) for connecting to a motor, wherein: A protective structure (2) is provided at one end of the shaft body (11); when the fan blade body (1) is installed on the motor, one end of the protective structure (2) is connected to the end cover (110) of the motor.

2. The fan blade structure according to claim 1, characterized in that: The protective structure (2) comprises a protective cover, which is arranged at one end of the shaft body (11) and is coaxially arranged with the shaft body (11); A protective space (21) is formed inside the protective cover, and the inner diameter of the protective space (21) is greater than the outer diameter of the axial body (11).

3. The fan blade structure according to claim 2, characterized in that: The protective cover and the shaft body (11) are designed to be integrally formed; or, The protective cover is detachably arranged on the shaft body (11).

4. The fan blade structure according to claim 2, characterized in that: The inner wall of the protective cover is arranged at an angle α with the axis of the axial body (11), wherein 5°<α<15°.

5. The fan blade structure according to claim 2, characterized in that: A convex edge (22) is provided on one end of the protective cover away from the fan blade body (1), the convex edge (22) protruding outward from the edge of the protective cover, and a contact surface (23) connected to the motor end cover (110) is provided on one side of the convex edge (22), the contact surface (23) being adapted to the outer wall of the motor end cover (110); A plurality of grooves (24) are arranged on the abutment surface (23), the length direction of each groove (24) is arranged along the direction from the inner diameter to the outer diameter of the abutment surface (23), and the plurality of grooves (24) are arranged on the abutment surface (23) along the circumferential direction of the abutment surface (23).

6. The fan blade structure according to claim 5, characterized in that: The axis of the groove (24) and the edge of the abutment surface (23) are arranged at an angle β, wherein 5°<β<15°.

7. The fan blade structure according to claim 5, characterized in that: A corner groove (25) is provided at the connection between the convex edge (22) and the protective cover, and the corner groove (25) is provided at the connection between the convex edge (22) and the protective cover along the circumference of the protective cover.

8. The fan blade structure according to any one of claims 2 to 7, characterized in that: The inner wall of the protective cover is provided with a spiral groove (26), and the spiral groove (26) is arranged on the inner wall of the protective cover along the axial direction of the protective cover.

9. A fan, comprising a motor and a fan blade structure as described in any one of claims 1 to 8, wherein the motor is provided with a motor shaft (100) and an end cover (110), and the fan blade structure is arranged on the motor shaft (100); and when the fan blade structure is arranged on the motor shaft (100), the protective structure (2) is connected to the end cover (110).

10. The fan according to claim 9, characterized in that: One end of the motor shaft (100) passes through the end cover (110) and is connected to the shaft core (11); a plurality of drainage grooves (120) are provided on the motor shaft (100); the drainage grooves (120) are arranged in a ring shape on the outer wall of the motor shaft (100), and the drainage grooves (120) are located between the end cover (110) and the fan blade structure.

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