Wing-shaped axial flow fan

Abstract

The invention provides a wing-shaped axial flow fan, which is characterized in that a shell of the fan adopts a streamline design that a square outer frame is internally tangent to a circular inner ring, a cross-shaped fixing frame is arranged on a mesh enclosure, and a gap is of an intermittent expansion type. The impeller is integrally designed, the blades and the wheel disc are integrally combined, and the design of the three-section arc-shaped blades and the frustum-shaped wheel disc improves the air outlet amount and the heat dissipation efficiency. Bionic reinforcing ribs and a tip winglet structure at the tail end are designed on the blade. And a protective cover and crossroad-shaped reinforcing ribs are arranged on the motor shell. The complex combination design of the motor shell comprises running-water-shaped reinforcing ribs on a disc and through round holes in a capsule frame body, so that the durability and the heat dissipation performance are further improved. The two ends of the rotating shaft are sleeved with the bearings, the gaskets and the small cover plates are designed at the two ends, vibration and noise during operation are reduced, and the operation comfort of the fan is improved. An L-shaped sheet is sleeved at one end of the motor shell far away from the mesh enclosure, and a screw arranged on the L-shaped sheet is matched with a round hole of a wheel disc on the impeller.

Description

Technical Field

[0001] The present invention relates to the technical field of axial flow fans, and in particular to an airfoil axial flow fan. Background Art

[0002] An axial flow fan is a device that uses the rotation of an impeller to convert gas into energy. Its working principle is similar to that of an airplane wing. It adjusts the flow rate and pressure of the airflow by changing the angle or spacing of the blades. This type of fan is widely used in industrial, commercial and agricultural fields, such as cooling engines, building ventilation and agricultural greenhouse ventilation. With the development of technology, modern axial flow fans adopt advanced aerodynamic design and variable frequency drive technology to achieve high efficiency, energy saving and flexible control. At the same time, they integrate intelligent monitoring and remote management systems to improve the convenience of operation and maintenance and the reliability of the system. In the future, the development trend of axial flow fans will focus on intelligence, modularization and environmentally friendly materials, and realize real-time monitoring of fan performance and fault warning through Internet of Things technology, further improving operation and maintenance efficiency.

[0003] The utility model patent with the authorization announcement number CN214837215U discloses a bionic noise-reducing and high-efficiency outer rotor axial flow fan, which is composed of a guide panel, a protective mesh cover, an outer rotor motor and an axial flow impeller. One end of the protective mesh cover is fixed on the guide panel, and the other end is fixed to support the outer rotor motor. The axial flow impeller is fitted with the output end of the outer rotor motor, and the axial flow impeller is arranged in the guide panel. The axial flow impeller is composed of multiple blades, and a shell-shaped spoiler structure is arranged on the blade. The shell-shaped spoiler structure is formed by multiple irregular wave-shaped structures that are gradually raised, and the multiple irregular wave-shaped structures that are gradually raised start from the middle of the blade and extend to the trailing edge of the blade. The axial flow impeller of the utility model has good aerodynamic performance, and the shell-shaped spoiler structure of the impeller reduces eddy current loss, significantly improves the efficiency of the fan, and significantly reduces noise.

[0004] However, the patent still has the following problems: First, there is a large difference between the inner ring diameter and the outer frame diameter of the axial flow fan. This design difference may affect the overall performance and efficiency of the fan. Secondly, there are many different blade designs, but not all designs can meet the ideal air output requirements, which may lead to unsatisfactory airflow delivery capabilities of the fan in actual applications. In addition, the design of the blade disc also faces challenges, especially under long-term heat dissipation requirements, the existing design may not be able to continue to provide efficient heat dissipation. These problems show that it has become urgent to design a new axial flow fan to solve these problems. The new fan needs to innovate in structural design, blade shape, and disc strength to improve the fan's air output, efficiency, and heat dissipation performance to meet the higher requirements of the market and industrial applications. Summary of the invention

[0005] The purpose of the present invention is to provide an airfoil axial flow fan with optimized structure and excellent performance, aiming to achieve the following goals through innovative casing and impeller design: improving the overall stability and durability of the fan through the streamlined casing with a circular inner ring inscribed in a square outer frame and the expanded gap between the cross-shaped fixed frame on the mesh cover.

[0006] The one-piece and three-section arc-shaped blade structure of the impeller is designed to increase the air output and improve the working efficiency of the fan. The bionic reinforcement ribs and the pointed winglet structure at the tail end are set on the blade to enhance the structural strength and fatigue resistance of the blade, while reducing vibration during high-speed rotation.

[0007] The impeller wheel disc is set to a cone shape with inscribed hexagonal holes and ventilation slots, aiming to improve the heat dissipation efficiency of the fan and ensure long-term stable operation.

[0008] The present invention provides an airfoil axial flow fan, comprising a casing and an impeller. The casing is in the shape of a streamlined outer shell with a circular inner ring inscribed in a square outer frame. A mesh cover is provided at one end of the circular inner ring of the casing. A plurality of cross-shaped fixing frames are provided on the mesh cover. The gap of the mesh cover is of an expansion type. The blades of the impeller are integrated with a wheel disc. The blades of the impeller are in a three-section arc shape. The wheel disc in the middle of the impeller is set in a frustum shape. A protective cover is provided in the middle of the impeller.

[0009] Preferably, the blades of the impeller are provided with a plurality of reinforcing ribs, which extend from the junction between the blades and the wheel disc to two-thirds of the blades, and the shape of the reinforcing ribs is a bionic structure similar to leaf veins.

[0010] Preferably, the tail end of the impeller blade is provided with a pointed winglet structure.

[0011] Preferably, the impeller disk of the impeller is provided with circular holes on the cone, and the positions of the circular holes are connected to each other to form an inscribed hexagon, and a plurality of ventilation slots are provided between each circular hole.

[0012] Preferably, the protective cover is on the motor housing, and one end of the motor housing close to the mesh cover is covered with a motor cover plate, and the motor cover plate is provided with reinforcing ribs in the shape of a crossroad.

[0013] Preferably, the motor housing is in the shape of a complex assembly, the main structure of which is a disc, and the middle of the disc close to the impeller is sleeved with two sleeves of different diameters, the two sleeves are coaxial, and the other side is a hollow capsule-shaped frame.

[0014] Preferably, a plurality of water-flowing reinforcing ribs are provided on the disc on one side of the motor housing close to the impeller, and a plurality of through circular holes are provided on the capsule frame on the other side of the motor housing.

[0015] Preferably, a rotating shaft is arranged in the middle of the sleeve of the motor housing.

[0016] Preferably, bearings are sleeved on the upper and lower parts of the rotating shaft, a gasket is arranged on the side close to the mesh cover, and a small cover plate is arranged on the other side.

[0017] Preferably, an L-shaped sheet is sleeved on one end of the motor housing away from the mesh cover, and screws are arranged on the L-shaped sheet, and the positions of the screws match the positions of the circular holes of the wheel disc on the impeller.

[0018] The airfoil axial flow fan of the present invention has the following main advantages: by enlarging the inner diameter of the fan outer frame, the impeller size is increased, thereby increasing the air output of the blades. The frustum-shaped wheel disc and the circular holes and ventilation slots on the wheel disc improve the heat dissipation efficiency and ensure the long-term stable operation of the fan.

[0019] The bionic reinforcement ribs on the blades enhance the structural strength and fatigue resistance of the blades. The pointed winglet structure at the tail end of the blades reduces vibration during high-speed rotation and improves operational stability. The middle protective cover and the reinforcement ribs on the motor housing improve the protection of the motor and the safety of the overall structure.

[0020] The complex combination of the motor housing improves durability and heat dissipation. The L-shaped sheet and screws simplify the installation and maintenance process of the fan. The bearings at both ends of the rotating shaft reduce friction and wear, extending the bearing life. The gasket and small cover reduce vibration and noise during fan operation, improving operating comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional view of the present invention.

[0022] Figure 2 A schematic diagram of the present invention.

[0023] Figure 3 An exploded view of the present invention.

[0024] In the figure: 1, casing, 2, mesh cover, 3, blades, 4, wheel disc, 5, motor casing, 6, rotating shaft, 7, bearing, 8, gasket, 9, small cover, 10, L-shaped sheet, 11, screw, 12, protective cover, 13, motor cover, 14 pointed winglet, 15, ventilation slot. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Please refer to Figure 1A wing-shaped axial flow fan comprises a casing 1 and an impeller. The casing 1 is in the shape of a streamlined casing with a circular inner ring inscribed in a square outer frame. A mesh cover 2 is provided at one end of the circular inner ring of the casing 1. A plurality of cross-shaped fixing frames are provided on the mesh cover 2. The gap of the mesh cover 2 is an expansion type. The blades 3 of the impeller are integrated with a wheel disc 4. The blades 3 of the impeller are in a three-section arc shape. The wheel disc 4 in the middle of the impeller is in a cone shape. A protective cover 12 is provided in the middle of the impeller.

[0027] The housing 1 of this airfoil axial flow fan adopts a streamlined shape with a square outer frame and a circular inner circle. This structure not only provides additional stability, but also helps to optimize air flow and reduce resistance. The cross-shaped fixing frame and the expanded gap on the mesh cover 2 not only enhance the firmness of the mesh cover 2, but also improve safety, prevent foreign matter from entering the fan, and protect the safety of operators. In order to prevent fingers from accidentally entering the fan, the axial height of the mesh cover 2 and the fan is set higher.

[0028] The integrated impeller is another highlight of the fan. The close combination of blades 3 and disc 4 reduces stress concentration in the connection part, thereby improving the durability and reliability of the impeller. The three-section arc blades 3 further optimize the airflow distribution, improve the efficiency and performance of the fan, and make the fan more efficient during operation.

[0029] The frustum-shaped wheel 4 is not only visually modern, but also plays an important role in function. It helps air flow and improves heat dissipation efficiency, which is essential for extending the service life of the fan. At the same time, the protective cover 12 in the middle of the impeller effectively protects the motor from the intrusion of dust and foreign matter, reduces motor failures, and improves the overall reliability of the fan.

[0030] In addition, noise and vibration control are also taken into consideration. The cone-shaped impeller 4 and the three-section curved blades 3 help reduce noise and vibration during fan operation, providing operators with a more comfortable working environment. In terms of maintenance, the integrated impeller and casing 1 make maintenance and replacement of parts easier, greatly reducing maintenance time and cost.

[0031] Finally, the streamlined housing and neat mesh cover 2 not only make the fan look neat and beautiful, but also suitable for various industrial and commercial environments, improving the market competitiveness of the product. In summary, this airfoil axial flow fan has shown significant advantages in many aspects such as performance improvement, enhanced safety, improved heat dissipation performance, reduced noise and vibration, and easy maintenance.

[0032] The impeller blades 3 are provided with a plurality of reinforcing ribs, which extend from the junction of the blades 3 and the wheel disc 4 to two-thirds of the blades 3 . The shape of the reinforcing ribs is a bionic structure similar to leaf veins. The tail end of the blade 3 is provided with a pointed winglet 14 structure.

[0033] The impeller blade 3 is provided with a number of reinforcing ribs, whose shape imitates the bionic structure of leaf veins in nature. These reinforcing ribs extend from the junction of the blade 3 and the wheel disc 4 to two-thirds of the blade 3, significantly enhancing the structural strength of the blade 3. Under high load or long-term operation conditions, the deformation and damage risks of the blade 3 can be effectively reduced, thereby extending the service life of the impeller and reducing maintenance costs.

[0034] The pointed winglet 14 is arranged at the tail end of the blade 3. This ingenious design has a significant effect on improving the aerodynamic performance and reducing noise of the fan. The pointed winglet 14 can reduce the tip leakage loss, improve the turbine aerodynamic efficiency, and improve the heat exchange conditions at the tip of the blade 3, which is crucial for the thermal management and power performance of the fan. In addition, the pointed winglet 14 can also effectively suppress the development of the tip leakage vortex and the tip separation vortex, reduce the aerodynamic noise of the axial flow fan, and provide a quieter working environment for the operator.

[0035] The reinforcement ribs of the bionic leaf vein structure not only improve the structural stability of the impeller, but also optimize the heat dissipation performance. This setting is inspired by the veins of blades in nature, which play an efficient heat dissipation and transportation function in plants. Applying this principle to the impeller can improve the impeller's thermal management capabilities and ensure stable performance even under high-load working conditions.

[0036] The impeller wheel 4 is provided with circular holes on the cone, and the positions of the circular holes are connected to each other to form an inscribed hexagon, and a plurality of ventilation slots 15 are provided between each circular hole.

[0037] The impeller disc 4 is provided with circular holes and ventilation slots 15, forming an efficient heat dissipation system. The circular holes are arranged in an inscribed hexagon on the frustum-shaped disc 4, and the choice of this geometric shape is well thought out. The hexagon is known for its symmetry and structural stability, which can maximize the heat dissipation area without sacrificing strength. The ventilation slots 15 between each circular hole further enhance this effect, which not only guide the air flow, but also help to disperse and release the heat generated when the impeller rotates at high speed.

[0038] The hexagonal holes provide more edge contact area, which means more heat exchange opportunities, thereby more effectively transferring the heat generated by the impeller to the surrounding environment. This is critical to keeping the impeller running at the optimal operating temperature, as excessive temperatures may reduce efficiency or even cause equipment damage.

[0039] Secondly, the ventilation slots 15 optimize the air flow. They ensure that the air can flow evenly through the impeller, reducing turbulence and eddies, both of which are common causes of energy losses. By reducing these losses, the impeller works more efficiently and energy consumption is reduced, which is a huge advantage for modern industrial applications that pursue energy efficiency.

[0040] By providing the circular holes and ventilation slots 15 in the impeller disc 4, the weight of the impeller is reduced, which is essential for increasing the speed and overall performance of the impeller. In many applications, such as the aviation and automotive industries, weight reduction can directly translate into higher performance and lower energy consumption.

[0041] Reasonable ventilation slots 15 help reduce the thermal and mechanical stress of the impeller under high load working conditions, thereby extending the service life of the impeller. This is an important consideration for reducing maintenance costs and improving equipment reliability.

[0042] In summary, the circular holes and ventilation slots 15 on the impeller disc 4 not only improve the heat dissipation efficiency and impeller performance, but also reduce weight, enhance structural stability, help extend the life of the impeller, and optimize the aerodynamic performance and thermal management capabilities of the impeller, which is crucial to improving the efficiency and reliability of the entire fluid machinery.

[0043] The protective cover 12 is covered on the motor housing 5, and the motor housing 5 is covered with a motor cover plate 13 at one end close to the mesh cover 2, and the motor cover plate 13 is provided with a crossroad-shaped reinforcing rib. The protective cover 12 plays a vital role on the motor housing 5. It not only protects the motor from the influence of the external environment, but also helps to maintain the stability and performance of the motor. The motor housing 5 is specially provided with a motor cover plate 13 at one end close to the mesh cover 2. The crossroad-shaped reinforcing ribs on the motor cover plate 13 not only enhance the structural strength and rigidity of the cover plate, but also improve the durability and reliability of the motor. Such reinforcing ribs can effectively prevent deformation or damage of the cover plate due to external impact or vibration during long-term operation, and ensure the safety of the precision parts inside the motor.

[0044] The cross-shaped reinforcement ribs can serve as heat dissipation channels to improve the heat dissipation efficiency of the motor. Good heat dissipation is essential to prevent motor overheating and maintain performance under high-intensity working conditions. In addition, these reinforcement ribs also help reduce vibration and noise during motor operation, improve the NVH performance of the entire system, and provide operators with a more comfortable working environment.

[0045] In terms of safety, the rib structure enhances the pressure resistance of the motor cover 13 and reduces the risk of the cover rupture due to pressure changes or accidental impacts. This is particularly important in industrial applications, because any rupture of the cover may cause motor failure and may even cause a safety accident. Therefore, the ribs play an important role in improving the safety of the motor.

[0046] The reinforcing ribs on the motor cover 13 increase the strength of the cover without adding too much weight, which helps to achieve lightweight design and reduce energy consumption. This design not only reduces the weight of the motor, but also improves energy efficiency, which is an important progress for modern industry that pursues environmental protection and energy saving.

[0047] Finally, the cross-shaped reinforcement rib also has a certain aesthetic effect. It makes the motor housing 5 look more solid and delicate, and improves the overall appearance texture of the product. In industrial design, aesthetics is often given equal weight to functionality. This design not only meets the functional needs, but also improves the aesthetic value of the product.

[0048] In summary, the motor cover 13 is provided with crossroad-shaped reinforcing ribs, which not only enhances the structural strength and durability of the motor, but also optimizes the heat dissipation performance, reduces vibration and noise, and improves safety and aesthetics. It is a practical innovation in motor design.

[0049] The motor housing 5 is in the shape of a complex assembly, and its main structure is a disc. Two sleeves of different diameters are sleeved in the middle of one side of the disc close to the impeller. The two sleeves are coaxial, and the other side is a hollow capsule-shaped frame.

[0050] The motor housing 5 is provided with a complex composite structure, and this innovative design brings a series of significant benefits. The main structure is a disc, and this disc arrangement provides a solid support base for the motor, enhancing the overall stability and strength. This structure helps the motor to remain stable in the face of external shocks and vibrations, ensures the long-term stable operation of the motor, and reduces downtime caused by mechanical failures.

[0051] Heat dissipation is a key factor in the motor setting, and the setting of the motor housing 5 effectively increases the heat dissipation area by setting two sleeves of different diameters on the side of the disc close to the impeller. This setting improves the heat dissipation efficiency of the motor, especially under high load or long-term operation conditions, good heat dissipation is essential to maintain the performance of the motor and extend its service life. In addition, this setting also helps to reduce the operating temperature of the motor, reducing performance degradation and potential damage caused by overheating.

[0052] Lightweighting is an important trend in modern industrial settings, and the complex assembly of the motor housing 5 achieves lightweighting without sacrificing strength and rigidity. The lightweight motor housing 5 not only saves materials, but also reduces the weight of the overall equipment, which is of great significance for improving energy efficiency and reducing energy consumption. The lightweight setting also brings convenience and reduces costs during transportation and installation.

[0053] The hollow capsule-shaped frame setting is another highlight of the motor housing 5, which provides great convenience for the maintenance and repair of the motor. This setting makes it easier to disassemble and assemble the motor housing 5, simplifies the maintenance process of the motor, and reduces maintenance time and cost. This is crucial to improving the availability and economy of the motor, especially in industrial environments that require frequent maintenance.

[0054] The motor housing 5 is also designed with safety in mind. This design can effectively isolate the motor from short circuits, leakages, and other faults in the motor, thereby preventing the motor from getting into a fire or other safety accident. This is of great significance for improving the safety of the working environment and protecting the safety of operators.

[0055] In terms of noise control, the setting of the motor housing 5 also plays a role. It can effectively reduce the noise and vibration generated when the motor is running, making the motor work more quietly and smoothly. This is especially important for application scenarios that require a low-noise environment, such as industrial facilities near hospitals, offices or residential areas.

[0056] Finally, the complex assembly of the motor housing 5 is also aesthetically pleasing. It can be arranged in various shapes as required, which increases the aesthetics of the product and also improves the overall appearance and texture of the product. In industrial settings, aesthetics is often given equal weight to functionality, and this arrangement not only meets the functional requirements, but also improves the aesthetic value of the product.

[0057] In summary, the complex combination of the motor housing 5 provides a comprehensive improvement in the performance, safety, maintenance convenience and aesthetics of the motor through its disc structure, sleeve setting, hollow capsule frame, light weight and aesthetics. This setting not only improves the working efficiency and reliability of the motor, but also reduces maintenance costs and enhances the market competitiveness of the product.

[0058] A plurality of water-flowing reinforcing ribs are arranged on the disc on the side of the housing close to the impeller, a plurality of through circular holes are arranged on the capsule frame on the other side of the motor housing 5, and a rotating shaft 6 is arranged in the middle of the sleeve of the motor housing 5. The motor housing 5 is arranged with a combination of water-flowing reinforcing ribs and through circular holes, and these carefully arranged elements jointly improve the performance and durability of the motor.

[0059] First, a plurality of water-flowing reinforcing ribs are arranged on the disc on the side of the motor housing 5 close to the impeller. This arrangement not only enhances the structural strength and rigidity of the housing, but also improves the stability and durability of the motor. The water-flowing reinforcing ribs can effectively disperse and absorb the vibration and pressure generated during operation, reduce the impact of mechanical load on the motor, and thus extend the service life of the motor. The arrangement of these reinforcing ribs imitates the principles of fluid dynamics in nature, making the motor housing 5 more uniform when bearing force, reducing local stress concentration, and improving overall durability.

[0060] Secondly, the capsule frame on the other side of the motor housing 5 is provided with a number of through circular holes, which serve as outlet holes, not only providing a channel for the motor wiring, but also having additional benefits. The provision of the outlet holes makes the wiring of the motor neater and more convenient, while also reducing the friction between the wires and the motor housing 5, protecting the insulation layer of the wires, and reducing the risk of short circuits and leakage. In addition, these circular holes also contribute to the heat dissipation of the motor, because they increase the area for air circulation, allowing heat to be dissipated more effectively from the inside of the motor.

[0061] Furthermore, a rotating shaft 6 is arranged in the middle of the sleeve of the motor housing 5, which is the core part of the motor operation. The arrangement of the rotating shaft 6 needs to take into account the load-bearing capacity of the bearing 7 and the dynamic balance of the motor. A good arrangement of the rotating shaft 6 can ensure the stability of the motor at high speed and reduce the vibration and noise caused by the imbalance of the shaft or the failure of the bearing 7. The precise matching of the rotating shaft 6 and the selection of the bearing 7 are crucial to the efficiency and life of the motor.

[0062] Finally, the setting of the motor housing 5 also takes into account lightness and aesthetics. The setting of the flowing water-shaped reinforcement ribs and the through-holes reduces the weight of the housing without sacrificing strength, which is particularly important for occasions that need to reduce the load, such as electric vehicles and portable devices. At the same time, these setting elements also give the motor housing 5 a modern and refined appearance, improving the overall texture of the product.

[0063] In summary, the arrangement of the flowing reinforcement ribs, the through-hole wire outlet holes and the rotating shaft 6 of the motor housing 5 together improve the structural strength, heat dissipation performance, safety, production efficiency and aesthetics of the motor, and provide comprehensive guarantee for the performance and service life of the motor.

[0064] The rotating shaft 6 is provided with bearings 7 on the upper and lower sides, a gasket 8 is provided on the side close to the mesh cover 2, and a small cover plate 9 is provided on the other side. As the core component of the motor, the bearing 7 mainly supports the wheel disc 4, reduces friction, and ensures the smooth operation of the motor. The bearings 7 are installed on both the upper and lower ends of the rotating shaft 6 to ensure that the wheel disc 4 remains stable when running at high speeds, reduce the risk of failure caused by damage to the bearings 7, and thus significantly improve the reliability and durability of the motor. This setting allows the motor to maintain high efficiency even during long-term operation, reducing maintenance costs and downtime.

[0065] The gasket 8 disposed near the side of the mesh cover 2 is mainly used to preload the bearing 7 to increase the rigidity of the bearing 7 and prevent the motor from resonating and slipping during operation. This preloading effect helps to reduce the vibration caused by the imbalance of the wheel disc 4, reduce noise, and improve the operating efficiency of the motor. The gasket 8 can also adapt to the expansion of the wheel disc 4 caused by temperature changes, ensuring that the motor can maintain optimal performance under different environmental conditions.

[0066] The small cover plate 9 on the other side protects the bearing 7 from dust and other pollutants, reduces the wear of the bearing 7 due to pollution, and extends the maintenance cycle of the bearing 7. This arrangement helps to keep the bearing 7 clean, reduce bearing 7 failures caused by pollution, and ensure the long-term stable operation of the motor.

[0067] The use of the gasket 8 and the cover plate can also effectively reduce the noise and vibration during the operation of the motor. The gasket 8 reduces the noise and vibration caused by the bearing 7 problem by eliminating the clearance of the bearing 7, while the cover plate further reduces the noise by protecting the bearing 7 from external factors.

[0068] The use of the gasket 8 simplifies the installation and adjustment process of the bearing 7. By adjusting the thickness of the gasket 8, the axial clearance of the bearing 7 can be accurately controlled to achieve accurate shaft alignment adjustment. This is essential to ensure efficient operation of the motor and reduce failures, and also makes the installation and maintenance of the motor easier.

[0069] The use of the small cover plate 9 also improves the safety and protection level of the motor, prevents external objects from entering the interior of the motor, and also prevents grease from leaking out, protecting the cleanliness of the interior of the motor. This is especially important for motors operating in harsh environments, and can ensure that the motor can operate safely and reliably under various conditions. In summary, the bearings 7 at the upper and lower ends of the rotating shaft 6, the gasket 8 on one side close to the mesh cover 2, and the small cover plate 9 on the other side, these settings together improve the performance, stability, safety and maintenance convenience of the motor.

[0070] The end of the motor body away from the mesh cover 2 is covered with an L-shaped sheet 10, and a screw 11 is set on the L-shaped sheet 10, and the position of the screw 11 matches the position of the circular hole of the wheel disc 4 on the impeller. The use of the L-shaped sheet 10 at the end of the motor body away from the mesh cover 2 not only provides stability for the connection with the impeller, but also helps to achieve a compact setting of the motor due to its unique structural characteristics. This compactness is particularly important in space-constrained applications, allowing the designer to integrate more functions in a limited space while keeping the overall structure compact and efficient.

[0071] The screws 11 on the L-shaped sheet 10 precisely match the circular holes of the impeller disc 4. This arrangement ensures that the motor disc 4 is precisely aligned during operation, which is essential for ensuring efficient operation of the motor and reducing vibration. At the same time, this precise connection method also simplifies the installation and maintenance process of the motor. The standardized connection method allows the motor to be quickly connected or disconnected from the impeller or other components, facilitating regular inspection and maintenance, and reducing maintenance time and costs.

[0072] The use of the L-shaped sheet 10 and the screw 11 improves the strength of the connection between the motor and the impeller. This arrangement can withstand greater mechanical stress and reduce the risk of failure caused by improper connection. In addition, the L-shaped sheet 10 can also prevent the intrusion of dust, moisture and other harmful substances, extending the service life of the motor, especially in harsh industrial environments, this protective effect is more obvious.

[0073] Good heat dissipation is essential for the motor to maintain optimal performance when running at high load or high speed. The setting of the L-shaped sheet 10 may help optimize the heat dissipation performance of the motor and improve the operating efficiency of the motor. At the same time, compared with the traditional connection method, the L-shaped sheet 10 may reduce the use of materials, thereby reducing costs. This setting can save materials while maintaining the reliability and strength of the connection.

[0074] In some bearingless 7 motor configurations, the use of L-shaped sheets 10 and screws 11 can enhance the passive stability of the wheel disc 4. This configuration allows the wheel disc 4 to remain stable even without active control, simplifies the control system, and improves the reliability of the motor.

[0075] The housing 1 of the fan of the present invention is a combination of a square outer frame and an inscribed circular streamlined outer shell. This combination not only presents a modern look visually, but also greatly improves the aerodynamic efficiency in terms of function. The square outer frame provides a solid support, while the streamlined outer shell optimizes air flow, reduces resistance, and improves the overall performance of the fan. The cross-shaped fixing frame on the mesh cover 2 further enhances the stability of the structure, ensuring the safety and reliability of the fan under various working conditions.

[0076] The integrated impeller tightly combines the blade 3 with the wheel disc 4. The three-section arc-shaped blade 3 optimizes the airflow and improves the efficiency of the fan. The bionic structural reinforcement ribs on the blade 3 imitate the shape of leaf veins in nature, which not only enhances the structural strength of the blade 3, but also improves the aerodynamic performance of the blade 3. The tail-shaped protrusion at the tail end of the blade 3 helps stabilize the airflow, reduce turbulence and noise, and further improve the operating quality of the fan.

[0077] The frustum shape and the inscribed hexagonal circular holes of the impeller wheel 4 not only reduce weight, but also improve heat dissipation efficiency and structural strength. The hollow grooves between the circular holes provide channels for air flow, further optimizing aerodynamic performance and heat dissipation effects.

[0078] The motor is provided with a crossroad-shaped reinforcement rib at one end near the mesh cover 2, which enhances the structural stability of the motor. The complex assembly structure of the motor housing 5, including a disc, sleeves of different diameters and a hollow capsule-shaped frame, provides additional mechanical support and thermal management capabilities. The disc on the side of the motor housing 5 near the impeller is provided with a water-flowing reinforcement rib, and the capsule frame on the other side is provided with a through circular hole. These arrangements improve the structural strength and heat dissipation efficiency of the motor, while also reducing the weight.

[0079] The upper and lower ends of the rotating shaft 6 are sleeved with bearings 7 to ensure the smoothness and accuracy of the rotation. A gasket 8 is arranged on one side close to the mesh cover 2, and a small cover plate 9 is arranged on the other side. These arrangements protect the bearing 7 from contamination, extend the service life of the bearing 7, and simplify the maintenance process.

[0080] Finally, an L-shaped sheet 10 is sleeved on one end of the motor housing 5 away from the mesh cover 2, and screws 11 are arranged on the L-shaped sheet 10. The positions of these screws 11 match the positions of the circular holes of the impeller disc 4, ensuring the precise connection between the motor and the impeller. This arrangement simplifies the installation process, improves the reliability of the connection, and is also convenient for maintenance and replacement of components.

[0081] In summary, the axial flow fan of the present invention achieves the goals of high performance, high stability and easy maintenance through the careful arrangement of various components, and meets the needs of modern industry for high-efficiency, low-noise and high-reliability fans. These innovative settings not only improve the performance of the fan, but also reduce energy consumption, extend the service life of the equipment, and bring real benefits to users.

[0082] The protection scope of the present invention is not limited to the specific embodiments described herein, but is determined by the attached claims and the equivalents recognized by the patent law. This means that all technical solutions that are the same or equivalent to the present invention in principle and spirit are within the protection scope of the present invention. Therefore, the innovation and practicality of the present invention are not limited to the current form, but also include all possible and reasonable derivatives and extensions.

Claims

1. An airfoil axial flow fan, comprising a casing and an impeller, characterized in that: The shape of the casing is a streamlined shell with a circular inner circle cut in a square outer frame, a mesh cover is arranged at one end of the circular inner circle of the casing, a plurality of cross-shaped fixing frames are arranged on the mesh cover, and the gap of the mesh cover is an expansion type; The blades of the impeller are integrated with the wheel disc. The blades of the impeller are in a three-section arc shape. The wheel disc in the middle of the impeller is in a frustum shape. A protective cover is arranged in the middle of the impeller.

2. The airfoil axial flow fan according to claim 1, characterized in that: The impeller blades are provided with a number of reinforcing ribs, which extend from the junction of the blades and the disc to two-thirds of the blades. The shape of the reinforcing ribs is a bionic structure similar to leaf veins.

3. The airfoil axial flow fan according to claim 2, characterized in that: The tail end of the impeller blade is provided with a pointed winglet structure.

4. The airfoil axial flow fan according to claim 1, characterized in that: The impeller wheel disc is provided with circular holes on the cone, and the positions of the circular holes are connected to each other to form an inscribed hexagon, and a number of ventilation slots are provided between each circular hole.

5. The airfoil axial flow fan according to claim 1, characterized in that: The protective cover is covered on the motor housing, one end of the motor housing close to the mesh cover is covered with a motor cover plate, and the motor cover plate is provided with reinforcing ribs in the shape of a crossroad.

6. The airfoil axial flow fan according to claim 1, characterized in that: The motor housing is in the shape of a complex assembly, the main structure of which is a disc. Two sleeves of different diameters are sleeved in the middle of one side of the disc close to the impeller. The two sleeves are coaxial, and the other side is a hollow capsule-shaped frame.

7. The airfoil axial flow fan according to claim 5 or 6, characterized in that: A plurality of water-flow-shaped reinforcing ribs are arranged on a disc on one side of the motor housing close to the impeller, and a plurality of through circular holes are arranged on a capsule frame on the other side of the motor housing.

8. The airfoil axial flow fan according to claim 7, characterized in that: A rotating shaft is arranged in the middle of the sleeve of the motor housing.

9. The airfoil axial flow fan according to claim 8, characterized in that: Bearings are arranged on the upper and lower sides of the rotating shaft, a gasket is arranged on the side close to the mesh cover, and a small cover plate is arranged on the other side.

10. The airfoil axial flow fan according to claim 8, characterized in that: An L-shaped sheet is sleeved on one end of the motor housing away from the mesh cover. Screws are arranged on the L-shaped sheet, and the positions of the screws match the positions of the circular holes of the wheel disc on the impeller.

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