Cooling fan blade and motor

Abstract

The invention relates to the technical field of mechanical heat dissipation parts, in particular to a cooling fan blade and a motor, the cooling fan blade comprises an annular base, an inner hole shaft sleeve and a plurality of blades, the inner hole shaft sleeve is coaxially and fixedly connected to the central area of the base, the blades are fixed on the base, the generatrix of each blade is parallel to the central axis of the inner hole shaft sleeve, and the generatrix of each blade is parallel to the central axis of the inner hole shaft sleeve. Each blade is provided with a connecting end and a free end; the connecting end is fixedly connected with the outer wall of the inner hole shaft sleeve and the surface of the base; the free end of the inner hole shaft sleeve extends outwards in the radial direction to be flush with the outer edge of the base, and an assembling groove is formed in the connecting position of the inner hole shaft sleeve and the base. The cooling fan blade is fixedly mounted at the axial end part of the rotating shaft. Unified use of large-scale motors is met, and the rotation direction of the motor is not fixed and single; the inner hole shaft sleeve has the advantages that the cooling fan blade is of an inner hole sleeve type structure and is directly pressed on the rotating shaft, upper and lower gaskets and nuts are not needed for fastening, the motor structure is optimized, and motor parts are reduced.

Description

Technical Field

[0001] This application relates to the technical field of mechanical heat dissipation components, and in particular to a cooling fan blade and a motor. Background Technology

[0002] With the continuous development of technology, wet and dry power motors are being used more and more widely in modern industry and daily life. Their trend towards miniaturization, high efficiency, low noise, and low vibration is of great significance for improving equipment performance and user experience. Miniaturized motors can adapt to more compact installation spaces, increasing equipment integration; high-efficiency motors can reduce energy consumption and operating costs; and low noise and low vibration can improve user comfort and reduce the impact on the surrounding environment.

[0003] To reduce motor winding temperature, existing technologies typically employ adding cooling fan blades to the motor shaft. Common cooling fan blades are metal stamping structures, characterized by planar bending and sharp-angled metal edges. During installation, nuts and washers are generally used to secure the cooling fan blades. Furthermore, existing cooling structures often feature inclined blades. These are all techniques commonly used to address motor cooling issues prior to the advent of this technical solution.

[0004] However, since the existing cooling structure has inclined blades, the motor rotates in a unidirectional direction when the fan blades are running. This requires the motor to rotate in any direction and does not allow for the motor to rotate in any direction. It cannot rotate in reverse, so it is impossible to standardize the use of the motor, which limits its large-scale production and application. Summary of the Invention

[0005] In order to meet the needs of large-scale unified use of motors and to prevent the motor rotation direction from being fixed and singular, the purpose of this application is to provide a cooling fan and a motor.

[0006] Firstly, the cooling fan blade provided in this application adopts the following technical solution: It includes a ring-shaped base, an inner bushing, and blades; The inner bushing is coaxially fixedly connected to the central region of the base; Multiple blades are provided and fixed on the base. The generatrix of the blades is parallel to the central axis of the inner bushing. Each blade has a connecting end and a free end. The connecting end is fixedly connected to both the outer wall of the inner bushing and the surface of the base. The free end extends radially outward to be flush with the outer edge of the base. The connection between the inner bushing and the base forms an assembly groove.

[0007] By adopting the above technical solution, the fan blades are vertically structured, which does not require the motor to rotate in any direction. Whether the motor rotates forward or backward, the internal airflow will be extracted during operation, which is inclusive of the motor's rotation direction. This fan blade can be used for both forward and reverse motors, unifying the advantages of motor components. The cooling fan blades are internally sleeved structures, which are directly press-fitted onto the shaft without the need for upper and lower washers and nuts for fastening, thus optimizing the motor structure and reducing the number of motor components.

[0008] Optionally, the edge end of the blade is provided with a rounded transition structure.

[0009] By adopting the above technical solutions, the aerodynamic noise generated by the blades when cutting through the airflow at high speed is significantly reduced, improving the quietness of the equipment during operation. Secondly, it eliminates sharp edges, avoiding the risk of scratches to personnel during manufacturing, handling, installation, or maintenance, thus improving safety. Finally, the rounded transition also reduces stress concentration, making the airflow on the blade surface and tip smoother, which helps maintain airflow stability and has a positive impact on the fatigue life of the blades.

[0010] Optionally, the plurality of blades are evenly distributed along the circumference of the inner bushing.

[0011] By adopting the above technical solution, the complete symmetry of mass and force distribution of the fan blades during rotation is ensured, thereby achieving excellent dynamic balance. This minimizes the unbalanced centrifugal force and vibration caused by mass eccentricity, resulting in extremely smooth fan operation. This not only reduces operating noise and extends the service life of the fan blades and connected components such as bearings, but also ensures the uniformity and stability of the output airflow, improving the uniformity of cooling effect.

[0012] Optionally, the surface of the blade is provided with at least one axially extending reinforcing rib.

[0013] By adopting the above technical solution, the reinforcing ribs act like a "skeleton" on the blade, greatly enhancing the bending stiffness and overall structural rigidity of the blade along its length without significantly increasing the blade's thickness and weight. This makes the blade more resistant to bending deformation caused by airflow impact loads and centrifugal forces under high-speed rotation, preventing aerodynamic efficiency from being affected or even interference caused by blade flutter or deformation. This design significantly improves the structural reliability of the wind turbine blade, ensuring its long-term stable operation under high-speed conditions.

[0014] Optionally, the base is curved from the inside out and downwards to form a conical structure with curved sides.

[0015] By adopting the above technical solution, when the fan blades rotate, they can more effectively guide the airflow radially from the central axis and smoothly exit along its curved surface, reducing airflow separation and vortex generation on the base surface, thereby reducing wind resistance loss. This optimizes the flow field, improves the fan blades' guiding efficiency and wind pressure, and ultimately enhances the overall heat dissipation and ventilation capabilities.

[0016] Optionally, the blades are configured with the same curvature as the base, such that the circumferential plane of the free ends of all blades is parallel to the circumferential plane of the connecting ends.

[0017] By adopting the above technical solution, a perfect fit and continuity between the blade surface and the base surface is achieved. This integrated streamlined design ensures a smooth and continuous airflow channel from the inner bushing area to the blade tip, with almost no abrupt transitions. It minimizes turbulence and energy loss at the junction of the blade root and the base, ensuring that the airflow is delivered efficiently and smoothly, further improving aerodynamic performance and potentially helping to reduce noise.

[0018] Optionally, the top of the inner bushing extends to a position higher than the highest point of all the blades.

[0019] By adopting the above technical solution, the extended portion at the top of the bushing forms a physical protective structure in the axial direction. During assembly or transportation, it preferentially contacts foreign objects, thus preventing the fragile and critical aerodynamic component of the blade edge from contacting or rubbing against other parts and being directly damaged by impact. Furthermore, this protruding structure can also serve as a centering or axial positioning reference during installation, providing additional axial protection and positioning functions for the entire fan blade.

[0020] Secondly, the motor provided in this application adopts the following technical solution: Includes a protective shell, a rotating shaft, rotor windings, stator windings, and the aforementioned cooling fan blades; The rotating shaft is rotatably disposed within the protective shell; The rotor winding is fixedly sleeved on the rotating shaft; The stator winding is coaxially fixed inside the protective shell and surrounds the rotor winding; The cooling fan blades are fixedly installed at the axial end of the rotating shaft.

[0021] By adopting the above technical solution and integrating this efficient and robust cooling fan, the motor achieves active forced ventilation cooling capability. The fan is directly mounted at the end of the shaft and rotates synchronously at high speed with the rotor, generating a stable and powerful axial or radial airflow that directly blows onto or draws through heat-generating components such as the stator and rotor windings, greatly enhancing the motor's heat dissipation efficiency. This helps reduce the motor's internal operating temperature, delays insulation aging, increases power density and continuous operating capability, thereby improving the overall performance, reliability, and service life of the motor.

[0022] Optionally, the blades of the cooling fan are oriented toward the rotor winding.

[0023] By adopting the above technical solution, precise targeted delivery of cooling airflow is achieved. When the fan blades rotate, the generated airflow is directly guided to the core heat source inside the motor—the rotor winding area—achieving direct and efficient cooling of the main heat source. This targeted cooling strategy is more efficient than non-directional heat dissipation, removing the main heat source with minimal airflow loss and optimizing the temperature distribution inside the motor. This is particularly crucial for controlling motor temperature rise and ensuring stable operation under harsh conditions.

[0024] Optionally, the inner bushing of the cooling fan blade is provided with a sealing groove, and a sealing ring is provided in the sealing groove, the sealing ring being tightly fitted with the rotating shaft.

[0025] By adopting the above technical solution, a reliable sealing barrier is constructed at the junction of the fan blade and the shaft. The sealing ring effectively prevents internal motor lubricating grease (such as bearing grease) from leaking axially along the shaft into the fan blade area, avoiding grease contamination of the blades and affecting balance and cooling efficiency, as well as preventing grease splashing that would cause waste and contamination. Simultaneously, it also prevents external dust and impurities from entering the motor through the gap between the shafts, serving as a dustproof seal and thus better protecting the cleanliness of the motor's interior and the normal operating environment of precision components such as bearings.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The fan blades have a vertical structure, which does not require the motor to rotate in any direction. Whether the motor rotates forward or backward, the internal airflow will be drawn out during operation. It is inclusive of the motor's rotation direction. This fan blade can be used for both forward and reverse motors, which unifies the advantages of motor components. 2. The cooling fan blades have an inner hole sleeve structure and are directly press-fitted onto the rotating shaft, eliminating the need for upper and lower washers and nuts for fastening. This optimizes the motor structure and reduces the number of motor parts. 3. The rounded transition of the blade edge, together with the conical base and the conformal curved blade, forms a streamlined aerodynamic surface with low noise and low resistance, effectively guiding the airflow to exit smoothly and efficiently. This not only reduces operating noise but also improves airflow efficiency and heat dissipation pressure, thus achieving a balance between quiet operation and efficient heat dissipation. 4. Targeted forced air cooling of heat sources such as rotor windings through directional installation greatly enhances heat dissipation efficiency; at the same time, the protective protrusion and sealing design of the inner bushing effectively prevent grease leakage and foreign object intrusion, which not only improves the power density and continuous operation capability of the motor, but also ensures the cleanliness of the internal environment and the reliability of overall operation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the cooling fan blade in Embodiment 1 of this application; Figure 2 This is a cross-sectional view of the cooling fan blades; Figure 3 This is a front view of the internal structure of the motor in Embodiment 2 of this application; Figure 4 This is a top cross-sectional view of the motor in Embodiment 2 of this application; In the picture, 1. Base; 2. Inner bore bushing; 3. Blade; 4. Groove; 5. Protective shell; 6. Shaft; 7. Rotor winding; 8. Stator winding. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail below.

[0029] Example 1: A cooling fan blade, referring to Figure 1 The fan assembly includes an annular base 1, an inner bushing 2, and blades 3. The inner bushing 2 is coaxially fixed to the central area of ​​the base 1. Multiple blades 3 are provided and fixed to the base 1. The generatrix of the blades 3 is parallel to the central axis of the inner bushing 2. Each blade 3 has a connecting end and a free end. The connecting end is fixedly connected to both the outer wall of the inner bushing 2 and the surface of the base 1. The free end extends radially outward to be flush with the outer edge of the base 1. The connection between the inner bushing 2 and the base 1 forms an assembly groove 4. This design optimizes the motor structure, reduces the weight of the fan blades and the original balance, reduces motor operating noise, and accommodates different motor rotation directions. This is because the inner bushing 2 structure can be directly press-fitted onto the rotating shaft 6 without additional washers and nuts, simplifying the structure; the plastic injection molding process achieves lightweighting, reducing the original balance; and the vertical structure and rounded corner transition of the blades 3 conform to fluid dynamics, reducing noise and eliminating requirements for rotation direction.

[0030] Specifically, the annular base 1 gradually curves downwards and outwards, forming a conical structure with curved sides. Base 1 can be made of high-strength plastic using injection molding, a material that is lightweight and low-cost. Alternatively, composite materials with good mechanical properties can be used to replace plastic. The curved structure of base 1 helps guide airflow and improves cooling efficiency.

[0031] Furthermore, refer to Figure 2 The inner bushing 2 is coaxially fixedly connected to the central area of ​​the base 1, with its top end extending above the highest point of all blades 3. The inner bushing 2 is also integrally molded with the base 1 using injection molding, and its smooth inner wall facilitates a tight fit with the rotating shaft 6. The inner bushing 2 can also be lined with metal to improve its wear resistance and strength. The connection between the inner bushing 2 and the base 1 forms an assembly groove 4, which serves as a positioning and buffer during installation.

[0032] Furthermore, multiple blades 3 are provided and fixed on the base 1, with the multiple blades 3 evenly distributed along the circumference of the inner bushing 2. The surface of each blade 3 is provided with at least one axially extending reinforcing rib, which can improve the strength of the blade 3 and prevent deformation during high-speed rotation. The edge of each blade 3 is provided with a rounded transition structure, which conforms to fluid dynamics characteristics and can effectively reduce noise during operation.

[0033] Furthermore, the blades 3 are designed with the same curvature as the base 1, so that the circumferential planes of the free ends of all blades 3 are parallel to the circumferential planes of the connecting ends. The blades 3 can be made of plastic injection molding or lightweight, high-strength materials such as carbon fiber to further reduce the weight of the wind turbine.

[0034] Furthermore, the base 1 provides a mounting foundation for the blades 3 and the inner bushing 2. The inner bushing 2 is used to connect with the rotating shaft 6 to realize the rotation of the fan blades. The multiple evenly distributed blades 3 generate airflow when rotating, which cools the motor. Due to the special structure and material of the blades 3, the fan blades have low noise and low vibration during operation, and there is no restriction on the rotation direction of the motor.

[0035] Optionally, the base 1 of the cooling fan blades can be a flat structure instead of a conical structure. This flat base 1 is relatively simple to manufacture and has a lower cost. The flat base 1 can also mount the inner bushing 2 and the blades 3, and can achieve basic cooling functions. However, compared to the conical base 1, the flat base 1 may be slightly less effective at guiding airflow.

[0036] While the cooling fan blades of the flat base 1 are not as effective as those of the conical base 1 in guiding airflow, they offer advantages such as simple manufacturing processes and low cost. For motor applications where cooling efficiency requirements are not particularly high, the cooling fan blades of the flat base 1 can meet basic cooling needs while reducing production costs and enhancing the product's market competitiveness.

[0037] The implementation principle of this application embodiment is as follows: The cooling fan blade adopts injection molding process and special structural design, which has obvious advantages compared with traditional metal stamped fan blades. Its lightweight design reduces the original balance of the fan blade and reduces motor vibration; the vertical structure and arc transition edge of the blade 3 conform to hydrodynamics, effectively reducing operating noise; the inner hole bushing 2 structure is directly press-fitted onto the rotating shaft 6, simplifying the motor structure and reducing the number of parts. These improvements make the motor more stable and efficient during operation, improve the service life and performance of the motor, and meet the development needs of miniaturization, high efficiency, low noise, and low vibration of dry and wet dual-purpose motors.

[0038] Example 2: A motor, referring to Figure 3 The motor assembly includes a protective housing 5, a rotating shaft 6, a rotor winding 7, a stator winding 8, and the aforementioned cooling fan. The rotating shaft 6 is rotatably mounted within the protective housing 5. The rotor winding 7 is fixedly sleeved on the rotating shaft 6. The stator winding 8 is coaxially fixed within the protective housing 5 and surrounds the rotor winding 7. The cooling fan is fixedly installed at the axial end of the rotating shaft 6, with its blades 3 facing the rotor winding 7. A sealing groove is provided within the inner bushing 2 of the cooling fan, and a sealing ring is installed within the sealing groove. The sealing ring fits tightly against the rotating shaft 6, effectively cooling the motor, reducing noise and vibration, and improving motor stability and reliability. This is because the cooling fan introduces airflow during motor operation, lowering the temperature of the motor windings; the special structure and material of the fan reduce noise and vibration; and the sealing ring prevents dust and moisture from entering the motor, protecting critical components.

[0039] Specifically, the protective shell 5 is divided into two parts: an upper shell and a lower shell. The shaft 6, rotor winding 7, stator winding 8, and cooling fan are placed sequentially inside the lower shell, and then the upper shell is fastened onto the lower shell and secured with screws. The upper shell has smooth through holes on its side wall, and the corresponding lower shell has threaded through holes. Screws pass through the smooth through holes in the upper shell and then into the threaded through holes in the lower shell, forming a threaded connection. This secures the protective shell 5 and its internal components. It is typically made of metal materials, such as aluminum alloy or stainless steel, which offer good strength and heat dissipation. Its structural design must also be able to withstand the weight of the motor and the vibrations generated during operation. The shape and structure of the protective shell 5 are designed according to the type of motor and the application scenario. It provides protection for the internal components of the motor, preventing interference from external factors.

[0040] An air collector shroud is also installed on the lower shell of the protective casing 5. The air collector shroud surrounds the cooling fan blades, and the minimum gap between the outer edge of the cooling fan blades and the inner wall of the air collector shroud is 0.2-0.5mm. The smaller gap can improve the sealing performance, reduce air leakage, and thus improve cooling efficiency. This draws the cooling airflow out of the motor, ensuring a constant cooling airflow within the motor. Combined with the motor air collector shroud, this effectively seals the inside of the motor, completely drawing the internal airflow out, greatly improving motor cooling efficiency and effectively reducing motor temperature rise. Higher temperatures result in greater wasted power loss during current conversion, thus improving motor efficiency and reducing power consumption. Because the cooling fan blades are installed inside the motor, the motor body also isolates the sound of the cooling fan blades, effectively reducing motor operating noise at the motor level.

[0041] Furthermore, bearings are installed at both ends of the rotating shaft 6. The outer wall of the upper bearing connects to the protective shell 5, and the outer wall of the lower bearing connects to the end cover. The function of the bearings is to support the rotating shaft 6, reduce the frictional resistance during rotation, and improve the operating efficiency of the motor. Rolling bearings are typically used, as they have advantages such as low friction coefficient and long lifespan. The installation of the bearings requires a certain level of precision and clearance to ensure stable rotation of the rotating shaft 6. The main function of the protective shell 5 is also to provide support and fixation for the motor, and to provide a mounting position for the upper bearings.

[0042] Furthermore, the rotating shaft 6 is made of high-strength alloy steel, and its surface is precision machined and heat-treated to ensure good wear resistance and fatigue resistance. The rotating shaft 6 is rotatably mounted inside the protective housing 5 and connected to the protective housing 5 through bearings, ensuring stable rotation of the rotating shaft 6.

[0043] Furthermore, the rotor winding 7 is fixedly sleeved on the rotating shaft 6, and it is made of copper wire with good conductivity. When energized, the rotor winding 7 generates a magnetic field, which interacts with the magnetic field generated by the stator winding 8, thereby causing the rotating shaft 6 to rotate.

[0044] Furthermore, refer to Figure 4 The stator winding 8 is coaxially fixed inside the protective housing 5 and surrounds the rotor winding 7. The stator winding 8 is also made of copper wire, and its structure and number of turns are designed according to the power and performance requirements of the motor. After being energized, the stator winding 8 generates a rotating magnetic field, which drives the rotor winding 7 to rotate.

[0045] Furthermore, the cooling fan is fixedly installed at the axial end of the rotating shaft 6, with its blades 3 facing the rotor winding 7. When the motor is running, the cooling fan rotates accordingly, introducing external airflow to cool the motor windings. The special structure and material of the cooling fan result in low noise and low vibration during operation.

[0046] Furthermore, the inner bushing 2 of the cooling fan blade is provided with a sealing groove, and a sealing ring is installed in the sealing groove. The sealing ring fits tightly with the rotating shaft 6. The sealing ring is usually made of rubber material, which has good elasticity and sealing performance. It can prevent dust, moisture and other impurities from entering the motor, protect the key components of the motor and extend the service life of the motor.

[0047] The implementation principle of this application embodiment is as follows: By employing specially designed cooling fan blades, the temperature of the motor windings is effectively reduced, improving the motor's efficiency and stability. The low noise and low vibration characteristics of the fan blades improve the motor's operating environment and enhance the user experience. The sealing ring further enhances the motor's protective performance, reduces motor failures caused by external factors, improves the motor's reliability and service life, and meets the market's demand for high-quality motors.

[0048] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A cooling fan blade, characterized by, The base (1), the inner hole sleeve (2) and the blades (3) are coaxial. The inner hole sleeve (2) is coaxially fixedly connected to the center area of the base (1). The blades (3) are provided in plurality and are fixed to the base (1), the generatrix of the blades (3) is parallel to the central axis of the inner hole sleeve (2), each of the blades (3) has a connecting end and a free end, the connecting end is fixedly connected to the outer wall of the inner hole sleeve (2) and the surface of the base (1), the free end extends radially outward to be flush with the outer edge of the base (1). The connecting part of the inner hole sleeve (2) and the base (1) forms an assembly groove (4).

2. The cooling fan blade of claim 1, wherein, The edge end of the blade (3) is provided with a circular arc transition structure.

3. The cooling fan blade of claim 2, wherein, The plurality of blades (3) are uniformly distributed along the circumference of the inner hole sleeve (2).

4. The cooling fan blade of claim 3, wherein, The surface of the blade (3) is provided with at least one axial reinforcing rib.

5. The cooling fan blade of claim 1, wherein, The base (1) is gradually curved from inside to outside and downward, forming a conical structure with an arc on the side surface.

6. A cooling fan blade according to claim 5, wherein, The blade (3) is provided with the same bending arc as the base (1), so that the circumferential plane where the free end of all blades (3) is located is parallel to the circumferential plane where the connecting end is located.

7. The cooling fan blade of claim 1, wherein, The top end of the inner hole sleeve (2) extends to a position higher than the highest point of all blades (3).

8. An electric machine characterized by The protective shell (5), the rotating shaft (6), the rotor winding (7), the stator winding (8) and the cooling fan blade of any one of claims 1-7 are included. The rotating shaft (6) is rotatably arranged in the protective shell (5). The rotor winding (7) is fixedly sleeved on the rotating shaft (6). The stator winding (8) is coaxially fixedly arranged in the protective shell (5) and surrounds the rotor winding (7). The cooling fan blade is fixedly installed at the axial end of the rotating shaft (6).

9. An electric machine according to claim 8, characterised in that The blade (3) of the cooling fan blade faces the rotor winding (7).

10. An electric machine as recited in claim 8, wherein, The inner hole sleeve (2) of the cooling fan blade is provided with a sealing groove, the sealing groove is provided with a sealing ring, and the sealing ring is tightly attached to the rotating shaft (6).

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