An axial flow fan driven by an outer rotor motor

Abstract

The utility model discloses an axial flow fan of outer rotor motor drive, include: outer rotor motor subassembly, impeller part, support frame subassembly and protective screen cover part, the impeller part coaxial fixed assembly in the lengthened output shaft of outer rotor motor subassembly, outer rotor motor subassembly passes through support frame subassembly fixed mounting, support frame subassembly with the end cover preset installation hole of outer rotor motor subassembly adaptation connection, protective screen cover part covers and set up in the rotor outside of outer rotor motor subassembly and one side of impeller part, protective screen cover part with support frame subassembly fixed connection. The utility model realizes fan power steady transmission and narrow space solid installation, guarantees ventilation performance and operation stability, eliminates the hidden danger of rotating part safety, adapts the use demand of wind power tower cylinder.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fans, and in particular to an axial flow fan driven by an external rotor motor. Background Technology

[0002] Axial flow fans are widely used in industrial settings such as wind turbine towers. They are mainly used to maintain air circulation inside the tower and provide suitable heat dissipation and operating environment for electrical equipment and mechanical components inside the tower. Their operational reliability, installation adaptability, and usage safety are directly related to the overall operation and maintenance efficiency of wind turbine towers.

[0003] In existing technologies, belt drives or ordinary key connections are commonly used to transmit power from the wind turbine to the impeller. However, belt drives are prone to belt loosening and wear after long-term use, while ordinary key connections may cause power transmission interruptions due to assembly gaps. Both can easily lead to unstable impeller speed, resulting in reduced wind turbine ventilation efficiency and making it difficult to meet the tower's requirement for continuous and stable ventilation. To address the problem of limited installation space within the wind turbine tower, existing methods often involve reducing the motor size or using simple welded brackets to fix the motor. Reducing the motor size sacrifices motor power, while simple welded brackets are not only difficult to align precisely with the motor during installation, but are also prone to deformation under wind turbine vibration, leading to motor displacement and affecting the overall operational stability of the wind turbine. Therefore, an axial flow wind turbine driven by an external rotor motor is proposed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an axial flow fan driven by an external rotor motor, thereby solving the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an axial flow fan driven by an external rotor motor, comprising: External rotor motor assembly, impeller assembly, support frame assembly, and protective mesh cover assembly; The output shaft of the external rotor motor assembly is an extended structure. The impeller component is coaxially fixedly mounted on the extended output shaft of the external rotor motor assembly. The external rotor motor assembly is fixedly installed through the support frame assembly. The support frame assembly is adapted to and connected to the pre-set mounting holes of the end cover of the external rotor motor assembly. The protective mesh cover is installed on the outside of the rotor of the outer rotor motor assembly and on one side of the impeller assembly. The protective mesh cover is fixedly connected to the support frame assembly. This axial flow fan is suitable for use in narrow installation spaces inside wind turbine towers.

[0006] Preferably, the length of the extended output shaft of the external rotor motor assembly is adapted to the assembly requirements of the impeller component. The end of the extended output shaft away from the external rotor motor assembly is provided with an axial positioning protrusion structure. The axial positioning protrusion structure is adapted to engage with the positioning groove provided on the inner wall of the central mounting hole of the impeller component, thereby improving the coaxiality of the impeller component after assembly. The coaxial fixation of the impeller assembly and the extended output shaft of the external rotor motor assembly ensures stable power transmission from the motor to the impeller, thereby guaranteeing the ventilation performance of the fan. The matching connection between the support frame assembly and the pre-set mounting holes on the end cover of the external rotor motor assembly enables stable installation of the motor in confined spaces, preventing displacement during operation and improving the overall operational stability of the fan. The protective mesh covering the outside of the rotor and one side of the impeller assembly provides safety protection for rotating components, preventing foreign objects from entering the fan or accidental contact with rotating parts, eliminating safety hazards, and ultimately adapting the fan to the limited installation space required within wind turbine towers.

[0007] Preferably, the support frame assembly includes an annular connecting seat, a housing, and at least three evenly distributed support arms. One side of the annular connecting seat is provided with a connecting hole that matches the mounting hole of the end cover of the outer rotor motor assembly. The annular connecting seat is fixed to the outer rotor motor assembly by fasteners passing through the connecting hole. The support arms are fixedly connected to the outer wall of the annular connecting seat to form a stable support structure. The housing is disposed outside the support arms.

[0008] Preferably, the protective mesh cover component has a cap-shaped structure, and the protective mesh cover component includes a mesh cover body and an edge connecting part. The edge connecting part is detachably connected to the outer shell of the support frame assembly by bolts. The mesh cover body adopts a metal mesh structure, which takes into account both protection and ventilation efficiency.

[0009] Preferably, a keyed connection structure is provided between the impeller component and the extended output shaft of the external rotor motor assembly. The keyed connection structure includes a keyway on the outer wall of the extended output shaft and a key block on the inner wall of the central mounting hole of the impeller component. The key block is fitted and engaged with the keyway, and the impeller component is fixed to the end of the extended output shaft away from the external rotor motor assembly by a locking nut to ensure the stability of power transmission.

[0010] Preferably, the support frame assembly, the protective mesh cover component, and the external rotor motor assembly are coaxially arranged. The support arm is made of high-strength carbon steel. The outer diameter of the outer shell is consistent with the outer diameter of the edge connection part of the protective mesh cover component. The thickness of the support arm is adapted to the load-bearing requirements of the motor, ensuring the coaxiality and installation stability of the overall structure of the axial flow fan.

[0011] In summary, compared with the prior art, this utility model provides an axial flow fan driven by an external rotor motor, which has the following beneficial effects: This utility model achieves direct and stable power transmission from the external rotor motor assembly to the impeller assembly by coaxially fixing the impeller component to the extended output shaft of the external rotor motor assembly. This ensures the ventilation performance of the wind turbine and solves the problem of insufficient ventilation efficiency caused by slippage in traditional wind turbine power transmission. The external rotor motor assembly is fixed by fitting the support frame assembly with the pre-set mounting holes on the end caps, enabling precise and stable installation in confined spaces. This improves the overall operational stability of the wind turbine and solves the problems of difficult motor installation and easy displacement during operation caused by limited space within the wind turbine tower. The protective mesh cover is placed on the outside of the rotor of the external rotor motor assembly and one side of the impeller component and fixed to the support frame assembly, effectively protecting the rotating parts. This prevents foreign objects from entering or personnel from contacting the rotating parts, thus avoiding safety accidents and solving the safety hazards associated with exposed rotors in traditional wind turbines. The overall design is suitable for installation in confined spaces within wind turbine towers. Attached Figure Description

[0012] Figure 1 This is a front view of the overall structure of the utility model.

[0013] Figure 2 This is a rear view of the overall structure of the utility model.

[0014] Figure 3 This is a three-dimensional view of the disassembled structure of the utility model.

[0015] Explanation of reference numerals in the attached figures: 1. External rotor motor assembly; 2. Impeller assembly; 3. Support frame assembly; 4. Protective mesh cover assembly; 5. Extended output shaft; 6. Mounting hole; 7. Axial positioning protrusion structure; 8. Housing; 9. Annular connecting seat; 10. Support arm; 11. Connecting hole. Detailed Implementation

[0016] This utility model provides a technical solution: an axial flow fan driven by an external rotor motor. Please refer to [link / reference needed]. Figure 1 , Figure 2 and Figure 3 ,include: External rotor motor assembly 1, impeller assembly 2, support frame assembly 3, and protective mesh cover assembly 4; The output shaft of the external rotor motor assembly 1 is an extended structure. The impeller component 2 is coaxially fixedly mounted on the extended output shaft 5 of the external rotor motor assembly 1. The external rotor motor assembly 1 is fixedly installed through the support frame assembly 3. The support frame assembly 3 is adapted to the pre-set mounting hole 6 of the end cover of the external rotor motor assembly 1. The protective mesh cover component 4 is installed on the outside of the rotor of the outer rotor motor assembly 1 and on one side of the impeller component 2. The protective mesh cover component 4 is fixedly connected to the support frame assembly 3. This axial flow fan is suitable for use in the narrow installation space inside the wind turbine tower. The extended output shaft 5 of the external rotor motor assembly 1 provides a coaxial mounting base for the impeller component 2, eliminating the need for a custom-made flat motor and allowing for direct modification of existing motors, significantly reducing costs and shortening the manufacturing cycle. The support frame assembly 3 is adapted to the pre-set mounting holes 6 on the end cover of the external rotor motor assembly 1, ensuring a stable motor installation and preventing displacement during operation. The protective mesh cover 4 covers the outside of the rotor and one side of the impeller component 2, effectively preventing the safety risks of foreign objects entering or personnel contacting rotating parts. At the same time, the overall structure allows for control of the axial length to adapt to the narrow space of the wind turbine tower, and the performance matching between the external rotor motor assembly 1 and the impeller component 2 can meet the requirements of static pressure and air volume, achieving a balance between small size and high performance, perfectly fitting the usage scenarios of wind turbine towers.

[0017] The length of the extended output shaft 5 of the external rotor motor assembly 1 is adapted to the assembly requirements of the impeller component 2. The end of the extended output shaft 5 away from the external rotor motor assembly 1 is provided with an axial positioning protrusion structure 7. The axial positioning protrusion structure 7 is adapted to and engaged with the positioning groove provided on the inner wall of the center mounting hole 6 of the impeller component 2, thereby improving the coaxiality of the impeller component 2 after assembly. The axial positioning protrusion structure 7 of the extended output shaft 5 of the external rotor motor assembly 1 is adapted and snapped into the positioning groove on the inner wall of the central mounting hole 6 of the impeller component 2, which significantly improves the assembly accuracy and operational stability. The precise fit between the axial positioning protrusion and the positioning groove can quickly calibrate the coaxiality during the assembly of the impeller component 2, avoiding impeller shaking during operation due to assembly misalignment. The improved coaxiality can reduce the wear of the output shaft of the impeller component 2 and the external rotor motor assembly 1, extend their service life, and reduce the operating noise caused by eccentricity. In addition, the precise coaxiality can also ensure stable airflow when the impeller component 2 rotates, avoid fluctuations in air volume and static pressure due to misalignment, and ensure that the axial flow fan always maintains high-performance output, meeting the ventilation stability requirements of wind turbine towers.

[0018] The support frame assembly 3 includes an annular connecting seat 9, a housing 8, and at least three evenly distributed support arms 10. One side of the annular connecting seat 9 is provided with a connecting hole 11 that is adapted to the mounting hole 6 of the end cover of the outer rotor motor assembly 1. The annular connecting seat 9 is fixed to the outer rotor motor assembly 1 by fasteners passing through the connecting hole 11. The support arms 10 are fixedly connected to the outer wall of the annular connecting seat 9 to form a stable support structure. The housing 8 is disposed outside the support arms 10. The annular connecting seat 9, the outer shell 8, and the multiple evenly distributed support arms 10 of the support frame assembly 3 provide a stable and durable mounting base for the external rotor motor assembly 1. At least three evenly distributed support arms 10 are adapted to the end cover mounting holes 6 of the external rotor motor assembly 1 through the connecting holes 11 of the annular connecting seat 9 and then fixed with fasteners, which can evenly distribute the weight of the motor and avoid excessive local stress that could lead to structural deformation. The support arms 10 are fixed to the outer wall of the annular connecting seat 9 to form a stable frame structure, which further enhances the support strength. The outer shell 8 is set on the outside of the support arms 10, which can isolate the support arms 10 from the corrosion of dust and debris inside the wind turbine tower, and extend the service life of the support frame assembly 3. This design not only ensures the stability of the external rotor motor assembly 1 during operation, but also improves the structural durability through the protection of the outer shell 8, making it fully suitable for the long-term use environment of the wind turbine tower.

[0019] The protective net cover component 4 has a hat-shaped structure. The protective net cover component 4 includes a net cover body and an edge connecting part. The edge connecting part is detachably connected to the outer shell 8 of the support frame assembly 3 by bolts. The net cover body adopts a metal mesh structure, which takes into account both protection and ventilation efficiency. The cap-shaped structure, metal mesh design, and detachable connection of the protective net cover component 4 achieve a balance between protection, ventilation, and ease of maintenance. The net cover body of the protective net cover component 4 adopts a metal mesh structure, which can block foreign objects from entering while not obstructing airflow when covering one side of the rotor of the outer rotor motor assembly 1 and the impeller assembly 2, ensuring that the ventilation efficiency of the wind turbine does not decrease, while meeting safety protection requirements. The edge connection part and the outer shell 8 of the support frame assembly 3 can be detached by bolts. During subsequent maintenance, it is not necessary to disassemble the entire wind turbine. Only the bolts need to be removed to remove the protective net cover component 4, which greatly saves maintenance time. The cap-shaped structure can fully cover one side of the rotor and impeller, avoiding blind spots in protection, further improving the safety factor, and fully meeting the safety standards for use inside wind turbine towers.

[0020] A key connection structure is provided between the impeller component 2 and the extended output shaft 5 of the external rotor motor assembly 1. The key connection structure includes a keyway on the outer wall of the extended output shaft 5 and a key block on the inner wall of the central mounting hole 6 of the impeller component 2. The key block and the keyway are fitted and snapped together. The impeller component 2 is fixed to the end of the extended output shaft 5 away from the external rotor motor assembly 1 by a locking nut to ensure the stability of power transmission. The key block and keyway adapter can directly restrict the relative rotation between the impeller component 2 and the output shaft, avoid slippage during power transmission, and ensure that the impeller component 2 can rotate synchronously with the output shaft, thus ensuring stable air volume and static pressure. The locking nut is locked from the end of the extended output shaft 5 away from the outer rotor motor assembly 1, further reinforcing the assembly of the impeller component 2 and preventing the impeller from loosening due to long-term high-speed operation. This double fixing structure can reduce power transmission loss, avoid operational failures caused by impeller loosening, extend the service life of the impeller component 2 and the outer rotor motor assembly 1, and ensure that the wind turbine can meet the ventilation requirements of the wind turbine tower in a long-term stable manner.

[0021] The support frame assembly 3, the protective mesh cover component 4 and the external rotor motor assembly 1 are coaxially arranged. The support arm 10 is made of high-strength carbon steel. The outer diameter of the outer shell 8 is consistent with the outer diameter of the edge connection part of the protective mesh cover component 4. The thickness of the support arm 10 is adapted to the load-bearing requirements of the motor to ensure the coaxiality and installation stability of the overall structure of the axial flow fan. The coaxial design, high-strength carbon steel support arm 10, and uniform outer diameter enhance the overall stability and adaptability of the axial flow fan. The coaxial arrangement of the support frame assembly 3, protective mesh cover component 4, and external rotor motor assembly 1 reduces eccentric vibration during operation, preventing component wear or excessive noise caused by vibration, while ensuring stable airflow output. The support arm 10 is made of high-strength carbon steel, combining lightweight design with high load-bearing capacity. It can support the weight of the external rotor motor assembly 1 without increasing the overall weight of the fan, facilitating installation. The outer diameter of the outer shell 8 is consistent with the outer diameter of the edge connection of the protective mesh cover component 4, making the overall structure more regular, saving installation space, and adapting to the narrow environment of wind turbine towers. In addition, the thickness of the support arm 10 is adapted to the motor's load-bearing requirements, further ensuring that the support frame assembly 3 does not deform during long-term operation, providing a guarantee for the overall stable operation of the fan.

[0022] This solution involves installing the axial flow fan inside the wind turbine tower. First, the external rotor motor assembly 1 is fixed in the preset installation position using the support frame assembly 3. The connecting hole 11 of the annular connecting seat 9 of the support frame assembly 3 is matched with the mounting hole 6 of the end cover of the external rotor motor assembly 1, and the fixing is completed with fasteners. Then, it is confirmed that the impeller component 2 has been assembled onto the extended output shaft 5 of the external rotor motor assembly 1 through the key connection structure (keyway and key block) and the locking nut. Then, the edge connecting part of the protective mesh cover component 4 is fixed to the outer shell 8 of the support frame assembly 3 with bolts. During operation, the external rotor motor assembly 1 is started, and its extended output shaft 5 drives the impeller component 2 to rotate synchronously. The rotation of the impeller component 2 generates airflow that meets the requirements of static pressure and air volume, satisfying the ventilation needs of the wind turbine tower. During the process, the protective mesh cover component 4 prevents foreign objects from entering and protects personnel safety. The support frame assembly 3 maintains the stability of the external rotor motor assembly 1, and the key connection structure and locking nut ensure stable power transmission. The overall structure works together to achieve safe and efficient ventilation.

Claims

1. An axial flow fan driven by an external rotor motor, characterized in that, include: External rotor motor assembly (1), impeller assembly (2), support frame assembly (3), and protective mesh cover assembly (4); The impeller component (2) is coaxially fixedly mounted on the extended output shaft (5) of the external rotor motor assembly (1). The external rotor motor assembly (1) is fixedly installed through the support frame assembly (3). The support frame assembly (3) is adapted to the pre-set mounting hole (6) of the end cover of the external rotor motor assembly (1). The protective mesh cover component (4) is placed on the outside of the rotor of the outer rotor motor assembly (1) and on one side of the impeller component (2). The protective mesh cover component (4) is fixedly connected to the support frame assembly (3).

2. The axial flow fan driven by an external rotor motor according to claim 1, characterized in that: The length of the extended output shaft (5) of the external rotor motor assembly (1) is adapted to the impeller component (2). The end of the extended output shaft (5) away from the external rotor motor assembly (1) is provided with an axial positioning protrusion structure (7). The axial positioning protrusion structure (7) is adapted to and engaged with the positioning groove provided on the inner wall of the center mounting hole (6) of the impeller component (2).

3. The axial flow fan driven by an external rotor motor according to claim 1, characterized in that: The support frame assembly (3) includes an annular connecting seat (9), a housing (8), and evenly distributed support arms (10). One side of the annular connecting seat (9) is provided with a connecting hole (11) that is adapted to the end cover mounting hole (6) of the external rotor motor assembly (1). The annular connecting seat (9) is fixed to the external rotor motor assembly (1) by fasteners passing through the connecting hole (11). The support arms (10) are fixedly connected to the outer wall of the annular connecting seat (9). The housing (8) is disposed outside the support arms (10).

4. An axial flow fan driven by an external rotor motor according to claim 1, characterized in that: The protective mesh cover component (4) has a hat-shaped structure. The protective mesh cover component (4) includes a mesh cover body and an edge connecting part. The edge connecting part is detachably connected to the outer shell (8) of the support frame assembly (3) by bolts.

5. An axial flow fan driven by an external rotor motor according to claim 1, characterized in that: A key connection structure is provided between the impeller component (2) and the extended output shaft (5) of the external rotor motor assembly (1). The key connection structure includes a keyway on the outer wall of the extended output shaft (5) and a key block on the inner wall of the central mounting hole (6) of the impeller component (2). The key block is adapted to and engaged with the keyway, and the impeller component (2) is fixed to the end of the extended output shaft (5) away from the external rotor motor assembly (1) by a locking nut.

6. An axial flow fan driven by an external rotor motor according to claim 3, characterized in that: The support frame assembly (3), the protective mesh cover component (4), and the outer rotor motor assembly (1) are coaxially arranged, and the outer diameter of the outer shell (8) is consistent with the outer diameter of the edge connection part of the protective mesh cover component (4).

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