Aviation axial flow fan with high reliability and light weight

Abstract

The invention relates to the related technical field of aviation axial flow fans, in particular to a high-reliability light aviation axial flow fan which comprises a fan frame body, a rotating shaft, a hub and blades, connecting plates are integrally formed on the side wall of an inner cavity of the fan frame body, and the connecting plates are evenly arranged in a circle around the side wall of the inner cavity of the fan frame body; a bearing mounting seat is integrally formed at the inner side end of the connecting plate, a ball bearing is fixedly mounted on the bearing mounting seat, the rotating shaft is fixed on a bearing inner ring of the ball bearing, and a mounting hole is formed in the hub; according to the axial flow fan, the hub and the blades are formed through PEEK and carbon fiber injection molding, so that the structural mass is reduced by 41%, the operation energy consumption of the axial flow fan is remarkably reduced, compared with a traditional aluminum alloy blade, the friction coefficient of the blades is lower, it is avoided that the blades generate high heat during high-speed rotation, the blades are optimized based on whale fin fluid characteristics, and the service life of the blades is prolonged. Therefore, the energy consumption of the axial flow fan is further reduced, and the operation noise of the axial flow fan can be lower.

Description

Technical Field

[0001] This invention relates to the technical field of aviation axial flow fans, specifically to an aviation axial flow fan with high reliability and lightweight. Background Technology

[0002] Aviation axial flow fans are axial flow fans specifically designed for the aviation field, possessing unique performance characteristics and a wide range of applications. Chinese patent document CN110319056A discloses an axial flow fan, which includes multiple blades, a hub, and a connection between the blades and the hub. The blades are evenly spaced around a rotation axis and held by the hub at a predetermined angle relative to a plane orthogonal to the rotation axis. Airflow is generated by the rotation of the blades. In a projection view of the axial flow fan along the rotation axis, between the radius of the connection and the midpoint between the radius of the connection and the radius of the outer periphery of the axial flow fan, an auxiliary blade is provided extending further backward in the rotation direction than the straight line connecting the following two points: a point located at the foremost position on the edge line behind the blades in the rotation direction, within the range from the outer periphery of the axial flow fan to the midpoint between the outer periphery of the axial flow fan and the connection; and a point on the edge line behind the rotation direction, within the midpoint between the radius of the connection and the outer periphery of the axial flow fan. However, the blades and hubs in the above-mentioned solutions and existing axial flow fan technologies have the following drawbacks: 1. Weight deficiency: The material density is high (approximately 2.7 g / cm³ for aluminum alloy). If multiple fans are used in parallel or series in the system, it will increase the aircraft's fuel consumption; 2. Insufficient reliability: The roughness and hardness of the surface of the metal cage affect the friction coefficient, which is usually between 0.2 and 0.3. High heat is generated at high speeds, which easily consumes lubricating grease, resulting in an average annual failure rate of up to 3.2 times / thousand hours; 3. High energy consumption and noise: The metal impeller requires more electrical energy to overcome its own load; the metal impeller is prone to high-frequency noise due to resonance. Therefore, this invention proposes a highly reliable and lightweight aviation axial flow fan to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a highly reliable and lightweight aviation axial flow fan to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a highly reliable and lightweight aviation axial flow fan, comprising: A fan frame, wherein a connecting plate is integrally formed on the inner cavity side wall of the fan frame, the connecting plate is evenly arranged in a circle around the inner cavity side wall of the fan frame, and a bearing mounting seat is integrally formed on the inner end of the connecting plate, and a ball bearing is fixedly installed on the bearing mounting seat. A rotating shaft, which is fixed to the inner ring of a ball bearing; A hub, wherein a mounting hole is provided on the hub, and the hub is positioned at the front end of the shaft through the mounting hole; The blade is integrally formed with the hub, and the blade is arranged in a circle around the edge of the hub.

[0005] Preferably, the hub and blades are both injection molded using PEEK and carbon fiber. The blades are optimized based on whale fin fluid characteristics, and the blades have delayed boundary layer separation and extended the efficient operating range to an inclination angle of 35°.

[0006] Preferably, the side wall of the rotating shaft is provided with a primary positioning groove and a secondary positioning groove, the inner side wall of the inner ring of the ball bearing is provided with a primary positioning hole, and the side wall of the mounting hole is provided with a secondary positioning hole. The primary positioning groove, the secondary positioning groove, the primary positioning hole, and the secondary positioning hole are all symmetrically arranged in a set, and the primary positioning hole and the secondary positioning hole are respectively arranged corresponding to the primary positioning groove and the secondary positioning groove. A primary positioning element is provided in the primary positioning groove, and a secondary positioning element is provided in the secondary positioning groove. The primary positioning element is used to form mutual positioning with the primary positioning hole, and the secondary positioning element is used to form mutual positioning with the secondary positioning hole.

[0007] Preferably, a spring groove is provided at the center of the front end of the rotating shaft, and a force-bearing rod groove is provided at the bottom of the spring groove. Movable holes are provided at the bottom of both the primary and secondary positioning grooves, and these movable holes are connected to the force-bearing rod grooves. The primary positioning component includes a movable rod, a movable seat, a return spring, and an outer force-bearing ring. The movable rod is movably disposed in the movable hole, and the movable seat is integrally formed on the side wall of the movable rod. The movable seat, the movable seat, and the return spring are all movably disposed in the primary positioning groove. The movable seat and the return spring are both sleeved on the movable rod. The inner and outer ends of the return spring are respectively fixedly glued to the movable seat and the outer force-bearing ring. The structure of the secondary positioning component is the same as that of the primary positioning component, and the installation methods of the secondary and primary positioning components are the same.

[0008] Preferably, a force-bearing rod is movably installed in the force-bearing rod groove, and a movable plate is integrally formed on the front end of the force-bearing rod. The movable plate is movably disposed in the spring groove, and a support spring is sleeved on the force-bearing rod. The two ends of the support spring are respectively abutted against the movable plate and the bottom of the spring groove.

[0009] Preferably, both the primary positioning hole and the secondary positioning hole are hemispherical groove structures. Both ends of the movable rod on the primary positioning component and the secondary positioning component are hemispherical. The bottom of the mounting hole is provided with a threaded hole, and a positioning bolt is threaded into the threaded hole. When the positioning bolt is fully screwed in, the inner ends of the movable rod on the primary positioning component and the secondary positioning component abut against the side wall of the force-bearing rod. At this time, the outer ends of the movable rod on the primary positioning component and the secondary positioning component are respectively embedded in the primary positioning hole and the secondary positioning hole.

[0010] Preferably, the side wall of the force-bearing rod is provided with a primary clearance groove and a secondary clearance groove. Both the primary clearance groove and the secondary clearance groove are annular grooves with an isosceles trapezoidal cross-section. When the support spring is in the reset state, the end face of the movable plate is flush with the end of the spring groove. At this time, the primary clearance groove and the secondary clearance groove are respectively aligned with the inner side of the movable rod on the primary positioning member and the secondary positioning member. At this time, the movable seat on the primary positioning member and the secondary positioning member moves inward under the action of the reset spring. At this time, the outer end of the movable rod on the primary positioning member and the secondary positioning member is completely disengaged from the primary positioning hole and the secondary positioning hole, respectively.

[0011] Preferably, the inner ring of the ball bearing has a primary positioning groove on its inner sidewall, the mounting hole has a secondary positioning groove on its sidewall, and the shaft has an integrally formed positioning protrusion on its sidewall. The primary positioning groove, the secondary positioning groove, and the positioning protrusion are all symmetrically arranged in a set, and the primary positioning groove, the secondary positioning groove, and the positioning protrusion are correspondingly arranged. When the shaft and the hub are actually installed, the positioning protrusion is inserted and positioned in the primary positioning groove and the secondary positioning groove, and at this time, the primary positioning component and the secondary positioning component are oriented in the same direction as the primary positioning hole and the secondary positioning hole, respectively.

[0012] Preferably, the port sidewalls of the primary positioning groove and the secondary positioning groove are provided with alignment grooves, and the sidewalls of the outer force rings on the primary and secondary positioning components are integrally formed with alignment protrusions. When the outer force ring is actually installed, the alignment protrusions are embedded in the alignment grooves, and at this time, the outer sidewall of the outer force ring is flush with the outer sidewall of the rotating shaft. When the outer force ring is actually installed and the return spring is in the return state, the movable seat moves to the bottom of the positioning groove.

[0013] Preferably, the rotating shaft is cast from a ferromagnetic material, and the movable seat is a magnetic block.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a highly reliable and lightweight aviation axial flow fan composed of a fan frame, shaft, hub, and blades, and by using PEEK and carbon fiber injection molding for the hub and blades, the structural weight is reduced by 41%, significantly reducing the operating energy consumption of the axial flow fan. Compared with traditional aluminum alloy blades, its blades have a lower coefficient of friction, avoiding the generation of high heat during high-speed rotation. Furthermore, the blades are optimized based on whale fin fluid characteristics, further reducing the energy consumption of the axial flow fan and making the operating noise of the axial flow fan lower. 2. By opening a primary positioning groove and a secondary positioning groove on the side wall of the rotating shaft, and opening a primary positioning hole on the inner side wall of the inner ring of the ball bearing, and setting a positioning component composed of a movable rod, a movable seat, a return spring and an outer force ring in the primary positioning groove and the secondary positioning groove, and opening a secondary positioning hole on the side wall of the mounting hole, it is convenient to quickly position the rotating shaft, the ball bearing and the hub through the positioning component; 3. By creating spring grooves and force rod grooves on the rotating shaft, and installing force rods, movable plates, and support springs within these grooves, and by creating threaded holes at the bottom of the mounting holes, the movable plate is positioned using positioning bolts in these threaded holes. This causes the force rods to exert a supporting force on the inner ends of the movable rods on the primary and secondary positioning components, allowing the outer ends of the movable rods on the primary and secondary positioning components to be inserted into the primary and secondary positioning holes, respectively. Thus, a single positioning bolt can synchronously position the rotating shaft, ball bearings, and wheel hub, effectively improving the convenience of routine maintenance for the rotating shaft, ball bearings, and wheel hub. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 This is a half-sectional view of the present invention; Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the rotating shaft structure of the present invention; Figure 6 This is a half-sectional view of the rotating shaft of the present invention; Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point B; Figure 8 This is a half-sectional view of the ball bearing of the present invention; Figure 9 This is a half-sectional view of the wheel hub of the present invention; Figure 10 for Figure 9Enlarged schematic diagram of the structure at point C; Figure 11 This is a schematic diagram of the force-bearing rod, movable plate, and supporting spring structure of the present invention; Figure 12 This is a schematic diagram of the primary positioning component of the present invention.

[0016] In the diagram: 1. Fan frame; 2. Shaft; 3. Hub; 4. Blade; 5. Connecting plate; 6. Bearing mounting seat; 7. Ball bearing; 8. Mounting hole; 9. Primary positioning groove; 10. Secondary positioning groove; 11. Positioning protrusion; 12. Spring groove; 13. Force rod groove; 14. Primary positioning component groove; 15. Secondary positioning component groove; 16. Primary positioning hole; 17. Secondary positioning hole; 18. Primary positioning component; 19. Secondary positioning component; 20. Movable hole; 21. Movable rod; 22. Movable seat; 23. Return spring; 24. Outer force ring; 25. Force rod; 26. Movable plate; 27. Support spring; 28. Threaded hole; 29. ​​Positioning bolt; 30. Primary clearance groove; 31. Secondary clearance groove; 32. Alignment groove; 33. Alignment protrusion. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-12 The present invention provides the following three preferred embodiments: Example 1: A highly reliable and lightweight aviation axial flow fan includes a fan frame 1, a rotating shaft 2, a hub 3, and blades 4. A connecting plate 5 is integrally formed on the inner cavity side wall of the fan frame 1. The connecting plate 5 is evenly arranged around the inner cavity side wall of the fan frame 1. A bearing mounting seat 6 is integrally formed on the inner end of the connecting plate 5. A ball bearing 7 is fixedly installed on the bearing mounting seat 6. The rotating shaft 2 is fixed on the inner ring of the ball bearing 7. A mounting hole 8 is opened on the hub 3. The hub 3 is positioned at the front end of the rotating shaft 2 through the mounting hole 8. The blades 4 are integrally formed with the hub 3, and the blades 4 are evenly arranged around the edge of the hub 3.

[0019] Both the hub 3 and the blade 4 are injection molded using PEEK and carbon fiber. Blade 4 is optimized based on whale fin fluid characteristics and delays boundary layer separation. It also extends the high-efficiency operating range to an inclination angle of 35°. By setting up a highly reliable and lightweight aviation axial flow fan composed of a fan frame 1, a rotating shaft 2, a hub 3, and blades 4, and by using PEEK and carbon fiber injection molding for hub 3 and blades 4, the structural weight is reduced by 41%, significantly reducing the operating energy consumption of the axial flow fan. Compared with traditional aluminum alloy blades, blade 4 has a lower coefficient of friction, avoiding the generation of high heat during high-speed rotation. Furthermore, blade 4 is optimized based on whale fin fluid characteristics, which further reduces the energy consumption of the axial flow fan and makes the operating noise of the axial flow fan lower.

[0020] Example 2: Based on Example 1, a primary positioning groove 14 and a secondary positioning groove 15 are provided on the side wall of the rotating shaft 2. A primary positioning hole 16 is provided on the inner side wall of the inner ring of the ball bearing 7, and a secondary positioning hole 17 is provided on the side wall of the mounting hole 8. A set of primary positioning grooves 14, 15, 16, and 17 are symmetrically arranged, with the primary positioning hole 16 and 17 corresponding to the primary positioning groove 14 and 15, respectively. A primary positioning element 18 is provided in the primary positioning groove 14, and a secondary positioning element 19 is provided in the secondary positioning groove 15. The primary positioning element 18 is used to form mutual positioning with the primary positioning hole 16, and the secondary positioning element 19 is used to form mutual positioning with the secondary positioning hole 17. By opening the primary positioning element groove 14 and the secondary positioning element groove 15 on the side wall of the rotating shaft 2, opening the primary positioning hole 16 on the inner side wall of the inner ring of the ball bearing 7, and setting the positioning element composed of the movable rod 21, the movable seat 22, the return spring 23 and the outer force ring 24 in the primary positioning element groove 14 and the secondary positioning element groove 15, and opening the secondary positioning hole 17 on the side wall of the mounting hole 8, it is convenient to form a quick positioning between the rotating shaft 2, the ball bearing 7 and the hub 3 through the positioning element.

[0021] A spring groove 12 is provided at the center of the front end of the rotating shaft 2. A force-bearing rod groove 13 is provided at the bottom of the spring groove 12. Movable holes 20 are provided at the bottom of the primary positioning part groove 14 and the secondary positioning part groove 15. The movable holes 20 are connected to the force-bearing rod groove 13. The primary positioning part 18 includes a movable rod 21, a movable seat 22, a return spring 23 and an outer force-bearing ring 24. The movable rod 21 is movably disposed in the movable hole 20. The movable seat 22 is integrally formed on the side wall of the movable rod 21. The movable seat 22, the movable seat 22 and the return spring 23 are all movably disposed in the primary positioning part groove 14. The movable seat 22 and the return spring 23 are both sleeved on the movable rod 21. The inner and outer ends of the return spring 23 are fixedly glued to the movable seat 22 and the outer force-bearing ring 24, respectively. The structure of the secondary positioning part 19 is the same as that of the primary positioning part 18, and the installation methods of the secondary positioning part 19 and the primary positioning part 18 are the same.

[0022] A force-bearing rod 25 is movably installed in the force-bearing rod groove 13. A movable plate 26 is integrally formed on the front end of the force-bearing rod 25. The movable plate 26 is movably disposed in the spring groove 12. A support spring 27 is sleeved on the force-bearing rod 25. The two ends of the support spring 27 are respectively abutted against the movable plate 26 and the bottom of the spring groove 12.

[0023] Both the primary positioning hole 16 and the secondary positioning hole 17 are hemispherical groove structures. The two ends of the movable rod 21 on the primary positioning component 18 and the secondary positioning component 19 are both hemispherical. A threaded hole 28 is provided at the bottom of the mounting hole 8, and a positioning bolt 29 is threaded into the threaded hole 28. When the positioning bolt 29 is fully screwed in, the inner ends of the movable rod 21 on the primary positioning component 18 and the secondary positioning component 19 abut against the side wall of the force-bearing rod 25. At this time, the outer ends of the movable rod 21 on the primary positioning component 18 and the secondary positioning component 19 are respectively embedded in the primary positioning hole 16 and the secondary positioning hole 17. This is achieved by opening a spring groove 12 and a force-bearing rod groove 13 on the rotating shaft 2, and... A force-bearing rod 25, a movable plate 26, and a support spring 27 are provided in section 13. A threaded hole 28 is opened at the bottom of the mounting hole 8, and the movable plate 26 is positioned by the positioning bolt 29 in the threaded hole 28. This causes the force-bearing rod 25 to provide support to the inner end of the movable rod 21 on the primary positioning component 18 and the secondary positioning component 19. This allows the outer end of the movable rod 21 on the primary positioning component 18 and the secondary positioning component 19 to be inserted into the primary positioning hole 16 and the secondary positioning hole 17, respectively. Thus, the shaft 2, the ball bearing 7, and the hub 3 can be synchronously positioned by a single positioning bolt 29, thereby effectively improving the convenience of daily maintenance of the shaft 2, the ball bearing 7, and the hub 3 in the later stages.

[0024] The side wall of the force-bearing rod 25 is provided with a primary clearance groove 30 and a secondary clearance groove 31. Both the primary clearance groove 30 and the secondary clearance groove 31 are annular grooves with an isosceles trapezoidal cross-section. When the support spring 27 is in the reset state, the end face of the movable plate 26 is flush with the end of the spring groove 12. At this time, the primary clearance groove 30 and the secondary clearance groove 31 are respectively aligned with the inner side of the movable rod 21 on the primary positioning member 18 and the secondary positioning member 19. At this time, the movable seat 22 on the primary positioning member 18 and the secondary positioning member 19 moves inward under the action of the reset spring 23. At this time, the outer end of the movable rod 21 on the primary positioning member 18 and the secondary positioning member 19 is completely disengaged from the primary positioning hole 16 and the secondary positioning hole 17, respectively. The provision of the primary clearance groove 30 and the secondary clearance groove 31 can further improve the convenience of disassembly and assembly between structures.

[0025] Example 3: Based on Example 2, a primary positioning groove 9 is provided on the inner sidewall of the inner ring of the ball bearing 7, a secondary positioning groove 10 is provided on the sidewall of the mounting hole 8, and a positioning protrusion 11 is integrally formed on the sidewall of the shaft 2. A set of primary positioning grooves 9, secondary positioning grooves 10, and positioning protrusions 11 are symmetrically arranged, and they are correspondingly positioned. During actual installation of the shaft 2 and hub 3, the positioning protrusion 11 is inserted and positioned within the primary positioning groove 9 and the secondary positioning groove 10. The primary positioning component 18 and the secondary positioning component 19 are respectively arranged in the same direction as the primary positioning hole 16 and the secondary positioning hole 17. The arrangement of the primary positioning groove 9, the secondary positioning groove 10 and the positioning protrusion 11 can facilitate the reduction of the radial force on the primary positioning component 18 and the secondary positioning component 19, thereby effectively improving the positioning stability of the primary positioning component 18 and the secondary positioning component 19. Furthermore, the positioning protrusion 11 is inserted into the primary positioning groove 9 and the secondary positioning groove 10, which can facilitate the alignment of the movable rod 21 on the primary positioning component 18 and the secondary positioning component 19 with the positioning hole.

[0026] Alignment grooves 32 are provided on the side walls of the primary positioning groove 14 and the secondary positioning groove 15. Alignment protrusions 33 are integrally formed on the side walls of the outer force rings 24 on the primary positioning parts 18 and 19. When the outer force rings 24 are actually installed, the alignment protrusions 33 are embedded in the alignment grooves 32. At this time, the outer side wall of the outer force rings 24 is flush with the outer side wall of the rotating shaft 2. When the outer force rings 24 are actually installed and the return spring 23 is in the return state, the movable seat 22 moves to the bottom of the positioning groove, which allows the primary positioning parts 18 and 19 to be completely inserted into the corresponding positioning grooves. This avoids interference caused by the outer force rings 24 when the rotating shaft 2, ball bearing 7, and hub 3 are disassembled and assembled, thereby further improving the ease of disassembly and assembly between the rotating shaft 2, ball bearing 7, and hub 3.

[0027] The rotating shaft 2 is cast from ferromagnetic material, and the movable seat 22 is a magnetic block to prevent the primary positioning component 18 and the secondary positioning component 19 from falling out of the primary positioning component groove 14 and the secondary positioning component groove 15.

[0028] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A highly reliable and lightweight aviation axial flow fan, characterized in that: include: A fan frame (1) has a connecting plate (5) integrally formed on the inner cavity side wall of the fan frame (1). The connecting plate (5) is evenly arranged around the inner cavity side wall of the fan frame (1). A bearing mounting seat (6) is integrally formed on the inner side end of the connecting plate (5). A ball bearing (7) is fixedly installed on the bearing mounting seat (6). A rotating shaft (2) is fixed on the inner ring of a ball bearing (7); A hub (3) is provided with a mounting hole (8), and the hub (3) is positioned at the front end of the shaft (2) through the mounting hole (8); The blade (4) is integrally formed with the hub (3), and the blade (4) is arranged in a circle around the edge of the hub (3).

2. The highly reliable and lightweight aviation axial flow fan according to claim 1, characterized in that: The hub (3) and blade (4) are both injection molded using PEEK and carbon fiber. The blade (4) is optimized based on the fluid characteristics of whale fins, and the blade (4) delays boundary layer separation and extends the efficient working range to an inclination angle of 35°.

3. The highly reliable and lightweight aviation axial flow fan according to claim 1, characterized in that: The rotating shaft (2) has a primary positioning groove (14) and a secondary positioning groove (15) on its side wall. The inner ring of the ball bearing (7) has a primary positioning hole (16) on its inner side wall. The mounting hole (8) has a secondary positioning hole (17) on its side wall. The primary positioning groove (14), the secondary positioning groove (15), the primary positioning hole (16), and the secondary positioning hole (17) are all symmetrically arranged in a set. The primary positioning hole (16) and the secondary positioning hole (17) are respectively arranged in correspondence with the primary positioning groove (14) and the secondary positioning groove (15). A primary positioning element (18) is provided in the primary positioning groove (14), and a secondary positioning element (19) is provided in the secondary positioning groove (15). The primary positioning element (18) is used to form mutual positioning with the primary positioning hole (16), and the secondary positioning element (19) is used to form mutual positioning with the secondary positioning hole (17).

4. The highly reliable and lightweight aviation axial flow fan according to claim 3, characterized in that: A spring groove (12) is provided at the center of the front end of the rotating shaft (2). A force rod groove (13) is provided at the bottom of the spring groove (12). Movable holes (20) are provided at the bottom of the primary positioning part groove (14) and the secondary positioning part groove (15). The movable holes (20) are connected to the force rod groove (13). The primary positioning part (18) includes a movable rod (21), a movable seat (22), a return spring (23), and an outer force ring (24). The movable rod (21) is movably disposed in the movable hole (20). The movable seat (22) is movably disposed in the movable hole (20). The movable seat (22) and the return spring (23) are integrally formed on the side wall of the movable rod (21). The movable seat (22) and the return spring (23) are all movably arranged in the primary positioning groove (14). The movable seat (22) and the return spring (23) are both sleeved on the movable rod (21). The inner and outer ends of the return spring (23) are fixedly glued to the movable seat (22) and the outer force ring (24) respectively. The structure of the secondary positioning component (19) is the same as that of the primary positioning component (18), and the installation methods of the secondary positioning component (19) and the primary positioning component (18) are the same.

5. A highly reliable and lightweight aviation axial flow fan according to claim 4, characterized in that: A force rod (25) is movably installed in the force rod groove (13). A movable plate (26) is integrally formed on the front end of the force rod (25). The movable plate (26) is movably disposed in the spring groove (12). A support spring (27) is sleeved on the force rod (25). The two ends of the support spring (27) are respectively abutted against the bottom of the movable plate (26) and the spring groove (12).

6. A highly reliable and lightweight aviation axial flow fan according to claim 5, characterized in that: The primary positioning hole (16) and the secondary positioning hole (17) are both hemispherical slot structures. The two ends of the movable rod (21) on the primary positioning component (18) and the secondary positioning component (19) are both hemispherical. The bottom of the mounting hole (8) is provided with a threaded hole (28). A positioning bolt (29) is threaded into the threaded hole (28). When the positioning bolt (29) is fully screwed in, the inner end of the movable rod (21) on the primary positioning component (18) and the secondary positioning component (19) abuts against the side wall of the force-bearing rod (25). At this time, the outer end of the movable rod (21) on the primary positioning component (18) and the secondary positioning component (19) is respectively embedded into the primary positioning hole (16) and the secondary positioning hole (17).

7. A highly reliable and lightweight aviation axial flow fan according to claim 6, characterized in that: The side wall of the force-bearing rod (25) is provided with a primary clearance groove (30) and a secondary clearance groove (31). The primary clearance groove (30) and the secondary clearance groove (31) are both annular grooves with an isosceles trapezoidal cross section. When the support spring (27) is in the reset state, the end face of the movable plate (26) is flush with the port of the spring groove (12). At this time, the primary clearance groove (30) and the secondary clearance groove (31) are respectively aligned with the inner side of the movable rod (21) on the primary positioning member (18) and the secondary positioning member (19). At this time, the movable seat (22) on the primary positioning member (18) and the secondary positioning member (19) moves inward under the action of the reset spring (23). At this time, the outer end of the movable rod (21) on the primary positioning member (18) and the secondary positioning member (19) is completely disengaged from the primary positioning hole (16) and the secondary positioning hole (17).

8. A highly reliable and lightweight aviation axial flow fan according to claim 7, characterized in that: The inner ring of the ball bearing (7) has a primary positioning groove (9) on its inner side wall, and the mounting hole (8) has a secondary positioning groove (10) on its side wall. The rotating shaft (2) has an integrally formed positioning protrusion (11) on its side wall. The primary positioning groove (9), the secondary positioning groove (10), and the positioning protrusion (11) are all symmetrically arranged in a set. The primary positioning groove (9), the secondary positioning groove (10), and the positioning protrusion (11) are correspondingly arranged. When the rotating shaft (2) and the hub (3) are actually installed, the positioning protrusion (11) is inserted and positioned in the primary positioning groove (9) and the secondary positioning groove (10). At this time, the primary positioning component (18) and the secondary positioning component (19) are arranged in the same direction as the primary positioning hole (16) and the secondary positioning hole (17), respectively.

9. A highly reliable and lightweight aviation axial flow fan according to claim 8, characterized in that: Alignment grooves (32) are provided on the side walls of the primary positioning groove (14) and the secondary positioning groove (15). Alignment protrusions (33) are integrally formed on the side walls of the outer force ring (24) on the primary positioning component (18) and the secondary positioning component (19). When the outer force ring (24) is actually installed, the alignment protrusions (33) are embedded in the alignment groove (32). At this time, the outer side wall of the outer force ring (24) is flush with the outer side wall of the rotating shaft (2). When the outer force ring (24) is actually installed and the reset spring (23) is in the reset state, the movable seat (22) moves to the bottom of the positioning groove.

10. A highly reliable and lightweight aviation axial flow fan according to claim 9, characterized in that: The rotating shaft (2) is made of ferromagnetic material, and the movable seat (22) is a magnet block.

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