Double-impeller axial magnetic flux wind driven generator

Abstract

The invention relates to the technical field of wind driven generators, in particular to a double-impeller axial magnetic flux wind driven generator which comprises a base, an oil tank is mounted at the top end of the base, an axial magnetic flux generator is mounted at the top end of the base, the double-impeller axial magnetic flux wind driven generator further comprises a main shaft, the axial magnetic flux generator comprises a protective shell, a rotor and two stators, and the protective shell is fixedly mounted at the top end of the oil tank. According to the axial magnetic flux generator, the power generation efficiency of the axial magnetic flux generator under the low-wind-speed condition can be effectively improved through cooperative work of the large impeller and the small impeller, unfolding of the blades, located in the windward direction, in the impellers and limiting of the sliding blocks, normal power generation of the axial magnetic flux generator can be achieved when wind power is small and the large impeller cannot rotate, and the service life of the axial magnetic flux generator is prolonged. Besides, by means of cyclic replacement of lubricating oil in the axial magnetic flux generator, abrasion in the axial magnetic flux generator can be effectively reduced, heat generated in the axial magnetic flux generator can be taken away, and therefore the service life of the axial magnetic flux generator is remarkably prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and in particular to a double-impeller axial magnetic wind turbine generator. Background Art

[0002] A wind turbine is a device that converts wind energy into electrical energy. Its core is to capture the kinetic energy of wind through the wind rotor and drive the generator to generate electricity. Wind turbines are usually divided into two types, one is a horizontal axis wind turbine and the other is a vertical axis wind turbine. Among them, a vertical axis wind turbine refers to a wind turbine whose rotating axis is perpendicular to the ground or the direction of the incoming flow, and it does not need to face the wind when the wind direction changes. In this respect, it is a major advantage over horizontal axis wind turbines. It can not only simplify its own structure, but also effectively reduce the gyroscopic effect of the impeller when facing the wind.

[0003] However, when vertical axis wind turbines are used under low wind speed conditions, there is a problem of difficulty in starting. When the wind speed is low, the blades on its impeller cannot generate enough lift or drag torque to overcome its own mechanical friction and bearing resistance, resulting in the impeller being unable to rotate independently, thereby affecting the smooth progress of wind power generation. Even if it is successfully started at a slightly higher wind speed, under continuous low wind speed conditions, the rotation speed of the vertical axis impeller is usually maintained at a low level, thereby reducing the efficiency of wind power generation. In addition, when the vertical axis wind turbine uses an axial flux generator, due to the compact structure of the generator, the internal space is relatively small, and the heat dissipation channel design is limited, which makes it difficult for the heat generated by the generator to be dissipated through effective channels during the rotation of the impeller to generate electricity. The accumulation of heat may not only affect the performance of the generator and reduce its service life, but may also affect its normal operation due to overheating, resulting in poor practicality. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of difficulty in generating electricity, low power generation efficiency and short service life of vertical axis wind turbines in the prior art when used under low wind speed conditions and using axial flux generators, and to propose a dual-impeller axial flux wind turbine generator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a dual-impeller axial magnetic wind turbine generator, comprising a base, an oil tank mounted on the top of the base, and an axial magnetic flux generator mounted on the top of the base, and further comprising: The main shaft, the axial flux generator includes a protective shell, a rotor and two stators. The protective shell is fixedly installed on the top of the oil tank. The main shaft is inserted through the protective shell, and two bearings are installed on its outer wall. It is rotatably connected to the protective shell through the bearings. The two stators are installed in the protective shell. The rotor is located between the two stators and is fixedly installed on the outer wall of the main shaft. The main shaft is located at the center of the two stators. The wind-driven rotation mechanism and the lubrication and heat dissipation mechanism are arranged on the main shaft and located above the axial flux generator. They are used to optimize the starting performance of the entire wind turbine under low wind speed conditions and improve the wind power generation efficiency. The wind-driven rotation mechanism includes a large impeller and a small impeller. Two overrunning clutches are installed on the large impeller, and it is installed on the outer wall of the main shaft through the overrunning clutch. A planetary reducer is installed on the top of the main shaft, and the small impeller is fixedly installed on the top of the planetary reducer. The structure of the small impeller is the same as that of the large impeller. The lubrication and heat dissipation mechanism is arranged on the oil tank and the main shaft, and is used to lubricate and dissipate heat inside the axial flux generator.

[0006] Preferably, lubricating oil is provided in the oil tank, the rotor is made of magnetic material, and there is a gap between the rotor and the inner wall of the protective shell, and the two stators are composed of multiple coil windings and multiple iron cores.

[0007] Preferably, the large impeller includes a shaft cylinder, a rotating cylinder and multiple blades, two overrunning clutches are installed on the inner wall of the shaft cylinder, the shaft cylinder is installed on the outer wall of the main shaft through the overrunning clutch, and multiple connecting rods are fixedly installed on its outer wall, a ball bushing is installed on the inner wall of the rotating cylinder, and is rotatably connected to the outer wall of the shaft cylinder through the ball bushing, multiple connecting rods are evenly distributed above and below the rotating cylinder, and a rotation limit assembly is commonly provided between the upper connecting rod and the corresponding single connecting rod below, and multiple blades are respectively installed on multiple rotation limit assemblies, and the rotation limit assembly is used to rotate the blades on it and can only rotate in a single direction. An adaptive adjustment assembly is commonly provided on the rotating cylinder and the multiple connecting rods, which is used to enable the blades in the windward direction to automatically adjust their rotation angle according to the wind force and their own position changes.

[0008] Preferably, both the windward end and the leeward end of the blade are provided with wind guiding surfaces, the wind guiding surface at the windward end is tilted inward, and the wind guiding surface at the leeward end is tilted outward.

[0009] Preferably, the adaptive adjustment assembly includes two guide rails and two sliding limit components, a plurality of connecting rods are installed on the inner sides of the two guide rails, and both are installed on the outer wall of the rotating drum through the plurality of connecting rods, the portion of the guide rail corresponding to the blades in the windward direction is recessed inwardly, and a wind force adjustment component is provided on the outer wall of the rotating drum, for ensuring that the recessed portion on the guide rail always corresponds to the position of the blades in the windward direction, the two guide rails are respectively located above and below the wind force adjustment component, and the two sliding limit components are respectively provided at the bottom ends of the plurality of connecting rods located above and the top ends of the plurality of connecting rods located below, and the two sliding limit components are symmetrical to each other; The sliding limit component located above includes multiple slide grooves, and multiple slide grooves are opened at the bottom ends of multiple connecting rods. A through hole is penetrated at the outward end of the inner wall of the slide groove, and a slider is slidably connected inside. A spring is installed at the inward end of the slider and is connected to the inner wall of the slide groove through the spring. The slider is a counterweight block, and an extension block is installed at its bottom near the spring position. The extension block is located outside the slide groove, and a roller is connected to the inner side of the extension block for rotation. The roller is contacted with the corresponding outer wall of the guide rail. One of the sliders corresponding to the recessed part on the guide rail has an outward end located in the slide groove, and the outward ends of the remaining multiple sliders are in contact with the corresponding inner wall of the blade.

[0010] Preferably, the wind force regulating component includes two paddle boards, which are symmetrically mounted on the outer wall of the drum, and a connecting plate is commonly mounted between the two paddle boards, and the recessed portion on the guide rail is located outside one of the paddle boards.

[0011] Preferably, the rotation limit assembly includes two connecting blocks, which are respectively installed on the outward ends of the corresponding two connecting rods away from the through-opening position, and a rotation groove is opened on the opposite side of the two connecting blocks, and a boss is rotatably connected to the opposite side of the two rotation grooves, and the inward end of the boss is in contact with the inner wall of the rotation groove, and the outward end is fixedly connected to the corresponding blade.

[0012] Preferably, the lubrication and heat dissipation mechanism includes an oil nozzle, which is fixedly mounted on the inner top wall of the oil tank, the bottom end of the main shaft passes through the inner bottom wall of the protective shell, and is rotatably connected to the oil nozzle through a bearing located below it, and a transport groove is provided at the bottom end of the main shaft and the bottom end of the oil nozzle, and the two transport grooves are connected to each other. The inner top wall of the transport groove on the main shaft is rotatably connected to a rotating rod, and a plurality of oil outlet holes are evenly penetrated on its inner side wall, and the transport groove on the main shaft is connected with the inside of the protective shell through the oil outlet holes, and a driving part for driving the rotating rod to rotate is provided in the main shaft, and an auger blade is installed on the outer wall of the rotating rod, and the auger blade is located in the two transport grooves, and a sieve plate is installed at the bottom opening of the transport groove on the oil nozzle, and a plurality of oil return pipes are evenly penetrated and fixedly mounted on the outer wall of the protective shell near the top, and the bottom end of the oil return pipe is penetrated and fixedly mounted on the top wall of the oil tank.

[0013] Preferably, it also includes a water cooling mechanism, which includes a water collecting frame fixedly installed on the top of the oil tank and with cooling water provided inside. A water pipe is installed on the outer wall of the water collecting frame, and the oil return pipe is located inside the water collecting frame.

[0014] Preferably, the height of the water collecting frame is lower than that of the axial flux generator, and a temperature sensor is installed on the top.

[0015] Compared with the existing technology, the advantages of the present invention are: 1. The present invention cooperates with the wind-driven rotation mechanism, the lubrication and heat dissipation mechanism, and the water-cooling mechanism, not only by utilizing the coordinated work of the large impeller and the small impeller, the expansion of the blades in the windward direction of the impeller, and the limiting of the slider, to effectively improve the power generation efficiency of the axial flux generator under low wind speed conditions, but also by utilizing the reduced speed rotation of the small impeller and the disconnection between the large impeller and the main shaft when the wind force is small and the large impeller cannot rotate to achieve normal power generation of the axial flux generator. In addition, by utilizing the circulating replacement of the lubricating oil inside the axial flux generator, not only can the wear inside the axial flux generator be effectively reduced, but the heat generated inside the axial flux generator can also be taken away, thereby significantly improving the service life of the axial flux generator.

[0016] 2. The present invention not only improves the power generation efficiency of the axial flux generator through the setting of the wind-driven rotation mechanism, but also can reduce its original expansion angle by utilizing the centrifugal force during rotation and the sliding of the slider when the external wind speed becomes larger. By adjusting the blade angle, the swept wind area of ​​the blade in the windward direction can be reduced, and its wind collection can be reduced, thereby achieving the purpose of reducing the speed of the large impeller, ensuring that the speed of the large impeller is always maintained within a safe range, preventing the axial flux generator from being overloaded due to excessive speed, and reducing the workload of maintenance personnel. In addition, when the external wind speed is too high, under the action of the slider, the blade in the windward direction will return to a state perpendicular to the connecting rod, and greatly reduce its wind collection, thereby protecting the axial flux generator and the blades, and preventing them from being damaged by excessively strong wind.

[0017] 3. Through the setting of the water cooling mechanism, the present invention can use the cooling water in the water collecting frame to cool the lubricating oil before entering the oil tank, so as to ensure that the lubricating oil entering the axial flux generator is sufficiently cooled, thereby ensuring the heat dissipation effect of the lubricating oil on the axial flux generator. Moreover, through the setting of the temperature sensor in the water cooling mechanism, when it is monitored that the water temperature in the water collecting frame is high, the staff can be reminded to add cooling water to the water collecting frame in time to ensure the normal progress of the lubricating oil heat dissipation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a working schematic diagram of a dual-impeller axial magnetic wind turbine generator proposed by the present invention; Figure 2 A half-section isometric view of a double-impeller axial magnetic wind turbine generator proposed in the present invention; Figure 3 for Figure 2 A partial enlarged view of the X in the middle; Figure 4 This is an axonometric view of the large wind wheel in the double-impeller axial magnetic wind turbine generator proposed by the present invention; Figure 5This is a partial cross-sectional isometric view of the large wind wheel in the double-impeller axial magnetic wind turbine generator proposed by the present invention; Figure 6 A half-section isometric view of a large wind wheel in a dual-impeller axial magnetic wind turbine generator proposed by the present invention; Figure 7 for Figure 6 A partial enlarged view of the middle Z position; Figure 8 This is an axonometric view of the blades in a double-impeller axial magnetic wind turbine proposed in the present invention.

[0019] In the figure: 1. base; 2. oil tank; 3. water collecting frame; 4. axial flux generator; 5. planetary reducer; 6. large impeller; 7. small impeller; 8. overrunning clutch; 9. main shaft; 21. oil nozzle; 22. sieve plate; 31. temperature sensor; 32. water pipe; 41. oil return pipe; 42. rotor; 43. stator; 61. shaft cylinder; 62. connecting rod; 63. guide rail; 64. rotating cylinder; 65. paddle; 66. blade; 661. air guide surface; 662. boss; 67. ball bushing; 68. slide groove; 69. spring; 610. slider; 611. roller; 91. bearing; 92. rotating rod; 93. oil outlet. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Reference Figures 1 to 3 A double-impeller axial magnetic wind turbine generator includes a base 1, an oil tank 2 is installed on the top of the base 1, lubricating oil is provided in the oil tank 2, and an axial magnetic flux generator 4 is installed on the top of the base 1, the axial magnetic flux generator 4 includes a protective shell, a rotor 42 and two stators 43, the rotor 42 is made of magnetic material, the two stators 43 are composed of multiple coil windings and multiple iron cores, the protective shell is fixedly installed on the top of the oil tank 2, and a main shaft 9 is inserted through the top of the protective shell, two bearings 91 are installed on the outer wall of the main shaft 9, and are rotatably connected to the protective shell through the bearings 91, the two stators 43 are installed in the protective shell, the rotor 42 is located between the two stators 43, and is fixedly installed on the outer wall of the main shaft 9, there is a gap between the rotor 42 and the inner wall of the protective shell, and the main shaft 9 is located at the center of the two stators 43.

[0022] Reference Figures 1 to 8, a wind-driven rotating mechanism is provided on the main shaft 9, and the wind-driven rotating mechanism is located above the axial flux generator 4, and is used to optimize the starting performance of the entire wind turbine under low wind speed conditions and improve the wind power generation efficiency. The wind-driven rotating mechanism includes a large impeller 6 and a small impeller 7. Two overrunning clutches 8 are installed on the large impeller 6, and are installed on the outer wall of the main shaft 9 through the overrunning clutch 8. A planetary reducer 5 is installed on the top of the main shaft 9, and the small impeller 7 is fixedly installed on the top of the planetary reducer 5. The structure of the small impeller 7 is the same as that of the large impeller 6. The large impeller 6 includes a shaft cylinder 61, a rotating cylinder 64 and a plurality of blades 66. Two overrunning clutches 8 are installed on the inner wall of the shaft cylinder 61. The shaft cylinder 61 is installed on the outer wall of the main shaft 9 through the overrunning clutch 8, and a plurality of connecting rods 62 are fixedly installed on its outer wall. A ball bushing 67 is installed on the inner wall of the rotating cylinder 64, and is rotatably connected to the outer wall of the shaft cylinder 61 through the ball bushing 67; Multiple connecting rods 62 are evenly distributed above and below the rotating drum 64. A rotation limit assembly is commonly provided between the upper connecting rod 62 and the corresponding single connecting rod 62 below. Multiple blades 66 are respectively installed on the multiple rotation limit assemblies. The rotation limit assembly is used to rotate the upper blades 66 and can only rotate in a single direction. The windward end and the leeward end of the blade 66 are both provided with a wind guide surface 661. The wind guide surface 661 at the windward end is tilted inward, and the wind guide surface 661 at the leeward end is tilted outward. The rotating drum 64 and the multiple connecting rods 62 are commonly provided with an adaptive adjustment assembly, which is used to enable the blades 66 in the windward direction to automatically adjust their rotation angle according to the wind force and their own position changes.

[0023] Reference Figures 4 to 8 The adaptive adjustment component includes two guide rails 63 and two sliding limit components. A plurality of connecting rods are installed on the inner sides of the two guide rails 63, and are installed on the outer wall of the rotating drum 64 through a plurality of connecting rods. The parts of the guide rails 63 corresponding to the blades 66 in the windward direction are recessed inwardly, and a wind adjustment component is provided on the outer wall of the rotating drum 64, which is used to keep the recessed parts on the guide rails 63 corresponding to the positions of the blades 66 in the windward direction. The two guide rails 63 are respectively located above and below the wind adjustment component. The wind adjustment component includes two paddle boards 65, which are symmetrically mounted on the outer wall of the rotating drum 64, and a connecting plate is commonly installed between the two paddle boards 65. The recessed part on the guide rail 63 is located on the outside of one of the paddle boards 65, and the two sliding limit components are respectively arranged at the bottom ends of the multiple connecting rods 62 located above and the top ends of the multiple connecting rods 62 located below, and the two sliding limit components are symmetrical to each other. The sliding limit component located at the top includes a plurality of slide grooves 68, and the plurality of slide grooves 68 are opened at the bottom ends of the plurality of connecting rods 62. A through hole is provided at the outward end of the inner wall of the slide groove 68, and a slider 610 is slidably connected inside. A spring 69 is installed at the inward end of the slider 610, and is connected to the inner wall of the slide groove 68 through the spring 69. The slider 610 is a counterweight block, and an extension block is installed at the bottom end thereof near the position of the spring 69. The setting of the slider 610 as a counterweight block can make the slider 610 move more smoothly in the slide groove 68. The extension block is located outside the slide groove 68, and its inward side is rotatably connected to the roller 611, and the roller 611 is connected to the The corresponding guide rails 63 are arranged in contact with the outer walls thereof, wherein one of the sliders 610 corresponding to the recessed portion on the guide rail 63 has its outward end located in the slide groove 68, and the outward ends of the remaining sliders 610 are in contact with the inner walls of the corresponding blades 66. The rotation limit assembly includes two connecting blocks, which are respectively installed at the outward ends of the corresponding two connecting rods 62 away from the through-opening position, and a rotation groove is provided on the opposite sides of the two connecting blocks. The opposite sides of the two rotation grooves are rotatably connected with a boss 662, and the inward end of the boss 662 is in contact with the inner wall of the rotation groove, and the outward end is fixedly connected to the corresponding blade 66.

[0024] Reference Figures 1 to 3 , a lubrication and heat dissipation mechanism is provided on the oil tank 2 and the main shaft 9, which is used to lubricate and dissipate heat inside the axial flux generator 4. The lubrication and heat dissipation mechanism includes an oil nozzle 21, which is fixedly mounted on the inner top wall of the oil tank 2. The bottom end of the main shaft 9 passes through the inner bottom wall of the protective shell and is rotatably connected to the oil nozzle 21 through a bearing 91 located below it. A transport groove is provided at the bottom end of the main shaft 9 and the bottom end of the oil nozzle 21. The two transport grooves are connected to each other. The top wall of the transport groove on the main shaft 9 is rotatably connected to a rotating rod 92, and a plurality of oil outlet holes 93 are evenly penetrated on its inner side wall. The transport groove on the main shaft 9 is connected to the inside of the protective shell through the oil outlet holes 93. A driving part for driving the rotating rod 92 to rotate is provided in the main shaft 9. The driving part is a prior art and is not drawn in the figure. Its specific structural design is not repeated here. An auger blade is installed on the outer wall of the rod 92, and the auger blade is located in the two transport troughs. A sieve plate 22 is installed at the bottom opening of the transport trough on the oil nozzle 21. The sieve plate 22 is used to prevent impurities that may exist in the lubricating oil from entering the transport trough. A plurality of return oil pipes 41 are evenly penetrated and fixedly installed near the top position of the outer wall of the protective shell. The bottom end of the return oil pipe 41 is penetrated and fixedly installed on the top wall of the oil tank 2. A water cooling mechanism is provided on the oil tank 2 for cooling the lubricating oil in the plurality of return oil pipes 41. The water cooling mechanism includes a water collecting frame 3, which is fixedly installed on the top of the oil tank 2 and is provided with cooling water inside. The height of the water collecting frame 3 is lower than the height of the axial flux generator 4, and a water pipe 32 is installed on its outer wall. The return oil pipe 41 is located in the water collecting frame 3, and a temperature sensor 31 is installed on the top of the water collecting frame 3.

[0025] When the present invention is in use, the large impeller 6 and the small impeller 7 are driven to rotate by external wind force, thereby driving the main shaft 9 to rotate. The rotating main shaft 9 drives the rotor 42 in the axial flux generator 4 to rotate. Since the rotor 42 is made of magnetic material and the two stators 43 are composed of multiple coil windings and multiple iron cores, the rotating rotor 42 will cut the magnetic flux lines generated by the two stators 43 to achieve power generation. Since the large impeller 6 and the small impeller 7 have the same structure, the structural design and operation process thereof will be introduced later using the large impeller 6 as an example. Since the connecting block is installed at the outward end of the connecting rod 62 away from the through-port position, and the blade 66 is rotatably connected to the rotating groove at the bottom end of the connecting block through the boss 662, and the inward end of the boss 662 contacts the inner wall of the rotating groove, the blade 66 is constrained by the contact between the boss 662 and the inner wall of the rotating groove during rotation, so that it can only rotate toward the through-port direction.

[0026] Since both the windward end and the leeward end of the blade 66 are provided with a wind guide surface 661, the wind guide surface 661 at the windward end is tilted inward, and the wind guide surface 661 at the leeward end is tilted outward. Therefore, when the large impeller 6 collects wind power through the blades 66 thereon to realize rotation, the airflow can enter the interior of the blade 66 in the windward direction more smoothly along the wind guide surface 661 at the windward end. At this time, under the action of the wind, the blade 66 in the windward direction will rotate and unfold with the wind, and the blade 66 in the leeward direction can guide the airflow to bypass the blade 66 more smoothly under the action of the wind guide surface 661 at its leeward end, so that the interaction between the airflow and the blade 66 The force is reduced, thereby effectively reducing the air resistance encountered by the blades 66 during rotation, so that the large impeller 6 can rotate more smoothly, thereby improving the power generation efficiency. At the same time, the paddle 65 on the drum 64 drives the drum 64 and the guide rail 63 thereon to rotate under the action of wind force until the orientation of the paddle 65 is parallel to the wind direction (that is, the wind direction calibration is completed). Since the portion of the guide rail 63 corresponding to the blade 66 in the windward direction is recessed inwardly, and the recessed portion on the guide rail 63 is located on the outside of one of the paddle boards 65, after the paddle board 65 completes the wind direction calibration through wind force, the recessed portion on the guide rail 63 always remains corresponding to the position of the blade 66 in the windward direction.

[0027] Since a sliding groove 68 is provided in the connecting rod 62 and the slider 610 is connected by a spring 69, and an extension block is installed on the slider 610, and the roller 611 on the extension block is in contact with the outer wall of the corresponding guide rail 63, when the roller 611 is not in the recessed part of the guide rail 63, the guide rail 63 will apply a thrust to the roller 611, and this thrust will be transmitted to the extension block and the slider 610 in turn, so that the slider 610 is subjected to the thrust. Under the action of the thrust, the outward end of the slider 610 will pass through the through opening and contact the inner wall of the corresponding blade 66, thereby forming a pushing effect on the blade 66. At the same time, the recessed part on the guide rail 63 always corresponds to the position of the blade 66 in the windward direction. Therefore, those blades 66 that are not in the windward direction (that is, the blades 66 that do not correspond to the recessed part on the guide rail 63) will be limited by the push of the slider 610 and remain perpendicular to the connecting rod 62 (that is, in a state where they cannot rotate).

[0028] Similarly, when the roller 611 is in the recessed portion on the guide rail 63, the recessed portion provides a relatively loose space for the roller 611, allowing the roller 611 to move a certain distance toward the rotating drum 64. At this time, the spring 69 uses its own elastic restoring force to make the slider 610 return to the slide groove 68 in the connecting rod 62, so that the blade 66 in the windward direction (that is, the blade 66 corresponding to the recessed portion on the guide rail 63) will not be pushed and limited by the slider 610, thereby allowing the blade 66 in the windward direction to rotate and unfold smoothly under the action of wind force. When the blade 66 in the windward direction unfolds with the wind, its inner side wall will be opposite to the windward wind direction, thereby increasing its contact with the wind. area, thereby being able to collect wind power more fully, and the blades 66 in the leeward direction remain perpendicular to the connecting rod 62, and the resistance they encounter is reduced under the action of the wind guide surface 661 at its leeward end, thereby helping the large impeller 6 to better overcome the starting resistance and maximize the utilization of wind energy, thereby effectively improving the power generation efficiency of the large impeller 6 under low wind speed conditions, and while the large impeller 6 is rotating, the small impeller 7 will also rotate under the action of wind power, and due to its lower mass, the speed of the small impeller 7 will be greater than the speed of the large impeller 6. Under the action of this speed difference, the small impeller 7 will provide assistance to the large impeller 6, and the two work together to further improve the power generation efficiency.

[0029] During the rotation of the large impeller 6, the slider 610 in the slide groove 68 will be affected by the centrifugal force and slide outward a short distance. When the wind force in the environment in which the large impeller 6 is located gradually increases, its rotation speed will accelerate accordingly. At this time, the centrifugal force exerted on the slider 610 will also increase accordingly. Under the action of the continuously increasing centrifugal force, the slider 610 corresponding to the blade 66 in the windward direction will slide outward a farther distance and pass through the opening to contact the inner wall of the blade 66. At this time, the blade 66 in the windward direction will be subjected to the top thrust applied by the slider 610. Under the action of this top thrust, the blade 66 will flip at a certain angle and reduce its original deployment angle.

[0030] By adjusting the angle of the blade 66, the swept area of ​​the blade 66 in the windward direction can be reduced, and its collection of wind force can be reduced, thereby achieving the purpose of reducing the rotation speed of the large impeller 6, ensuring that the rotation speed of the large impeller 6 is always maintained within a safe range, preventing the axial flux generator 4 from being overloaded due to excessive rotation speed, and reducing the workload of maintenance personnel. When the wind force exceeds a certain intensity, the slider 610 will be completely thrown out of the slide 68. At this time, the blade 66 in the windward direction will return to a state perpendicular to the connecting rod 62 and greatly reduce its collection of wind force, thereby protecting the axial flux generator 4 and the blade 66 and preventing them from being damaged by excessively strong wind force.

[0031] Since the overrunning clutch 8 can adjust the connection between the large impeller 6 and the main shaft 9 through the speed switching state of the large impeller 6, when the wind force in the environment where the large impeller 6 is located is small and the small impeller 7 can rotate under the action of the wind force, and the large impeller 6 cannot rotate, the overrunning clutch 8 on the large impeller 6 will automatically disconnect the connection between the shaft cylinder 61 on the large impeller 6 and the main shaft 9 according to its working characteristics, thereby avoiding the additional burden on the rotation of the main shaft 9 due to the weight of the large impeller 6 itself when the small impeller 7 rotates. At the same time, although the small impeller 7 can rotate, due to its relatively small mass, the torque generated during rotation is also low, and the low torque is difficult to directly drive the main shaft 9 to rotate and drive the axial flux generator 4 to generate electricity. At this time, under the action of the planetary reducer 5, the speed of the small impeller 7 can be reduced. According to the principle of conservation of power, as the speed is reduced, its torque will increase, so that the rotating small impeller 7 can smoothly drive the main shaft 9 to rotate and drive the power generation axial flux generator 4 to generate electricity.

[0032] As the main shaft 9 rotates, the rotor 42 in the axial flux generator 4 rotates to generate electricity. Heat will continue to be generated inside the axial flux generator 4. At the same time, the internal rotor 42 will also cause friction and wear between the surrounding parts due to continuous rotation. In order to solve these problems, the rotation of the main shaft 9 will drive the rotating rod 92 and the auger blades on the rotating rod 92 to rotate, thereby continuously transporting the lubricating oil in the oil tank 2 through the oil nozzle 21 to the transport groove on the main shaft 9, and then enter the axial flux generator 4 through multiple oil outlet holes 93. Due to the gap between the rotor 42 and the inner wall of the protective shell, Moreover, the two stators 43 are composed of multiple coil windings and multiple iron cores. The lubricating oil entering the axial flux generator 4 can spread smoothly and, while playing a lubricating role, squeeze out the same volume of lubricating oil in the axial flux generator 4 (the conventional axial flux generator 4 is provided with lubricating oil). The squeezed lubricating oil then enters the oil tank 2 through the return oil pipe 41. This cycle is repeated, which can not only effectively reduce the wear inside the axial flux generator 4, but also take away the heat generated inside the axial flux generator 4, thereby significantly improving the service life of the axial flux generator 4.

[0033] The water collecting frame 3 contains collected rainwater or cooling water injected by the staff. The height of the water collecting frame 3 is lower than the height of the axial flux generator 4, which can prevent the cooling water therein from overflowing and seeping into the axial flux generator 4, thereby avoiding the damage of the axial flux generator 4 caused by the infiltration of cooling water. Since the return oil pipe 41 is located in the water collecting frame 3, the lubricating oil flowing back to the oil tank 2 through the return oil pipe 41 will be cooled under the action of the cooling water to ensure that the lubricating oil entering the axial flux generator 4 is sufficiently cooled, thereby ensuring the heat dissipation effect of the lubricating oil on the axial flux generator 4. In addition, the temperature sensor 31 at the top of the water collecting frame 3 can monitor the temperature of the water body in the water collecting frame 3 in real time. In a high temperature environment such as summer, if the water temperature in the water collecting frame 3 is high and it is difficult to effectively reduce the temperature of the lubricating oil, the temperature sensor 31 will send a signal to remind the staff to replenish cooling water into the water collecting frame 3 in time through the water pipe 32 to ensure the normal progress of the lubricating oil heat dissipation process.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-impeller axial magnetic wind turbine generator, comprising a base (1), an oil tank (2) mounted on the top of the base (1), and an axial magnetic flux generator (4) mounted on the top of the base (1), characterized in that: Also includes: The main shaft (9) and the axial flux generator (4) include a protective shell, a rotor (42) and two stators (43). The protective shell is fixedly mounted on the top of the oil tank (2). The main shaft (9) is inserted through the protective shell and two bearings (91) are mounted on the outer wall of the main shaft (9). The main shaft (9) is rotatably connected to the protective shell through the bearings (91). The two stators (43) are mounted in the protective shell. The rotor (42) is located between the two stators (43) and is fixedly mounted on the outer wall of the main shaft (9). The main shaft (9) is located at the center of the two stators (43). A wind-driven rotating mechanism and a lubricating and cooling mechanism are provided. The wind-driven rotating mechanism is provided on a main shaft (9) and is located above an axial magnetic flux generator (4). The mechanism is used to optimize the starting performance of the entire wind turbine generator under low wind speed conditions and improve the wind power generation efficiency. The wind-driven rotating mechanism includes a large impeller (6) and a small impeller (7). Two overrunning clutches (8) are installed on the large impeller (6), and the large impeller is installed on the outer wall of the main shaft (9) through the overrunning clutch (8). A planetary reducer (5) is installed on the top of the main shaft (9). The small impeller (7) is fixedly installed on the top of the planetary reducer (5), and the structure of the small impeller (7) is the same as that of the large impeller (6). The lubricating and cooling mechanism is provided on an oil tank (2) and a main shaft (9), and is used to lubricate and cool the interior of the axial magnetic flux generator (4).

2. The double-impeller axial magnetic wind turbine generator according to claim 1, characterized in that: Lubricating oil is provided in the oil tank (2), the rotor (42) is made of a magnetic material, and a gap exists between the rotor (42) and the inner wall of the protective shell, and the two stators (43) are composed of a plurality of coil windings and a plurality of iron cores.

3. The double-impeller axial magnetic wind turbine generator according to claim 1, characterized in that: The large impeller (6) includes a shaft cylinder (61), a rotating cylinder (64) and a plurality of blades (66). Two overrunning clutches (8) are installed on the inner wall of the shaft cylinder (61). The shaft cylinder (61) is installed on the outer wall of the main shaft (9) through the overrunning clutch (8). A plurality of connecting rods (62) are fixedly installed on the outer wall of the shaft cylinder (61). A ball bushing (67) is installed on the inner wall of the rotating cylinder (64) and is rotatably connected to the outer wall of the shaft cylinder (61) through the ball bushing (67). The plurality of connecting rods (62) are evenly distributed on the rotating cylinder (61). 4) A rotation limit assembly is provided between the upper connecting rod (62) and the corresponding single connecting rod (62) at the lower side. The plurality of blades (66) are respectively mounted on the plurality of rotation limit assemblies. The rotation limit assemblies are used to rotate the upper blades (66) and can only rotate in a single direction. The rotating drum (64) and the plurality of connecting rods (62) are provided with an adaptive adjustment assembly to enable the blades (66) facing the wind to automatically adjust their rotation angles according to the wind force and the change in their own positions.

4. The double-impeller axial magnetic wind turbine generator according to claim 3, characterized in that: The windward end and the leeward end of the blade (66) are both provided with wind guide surfaces (661), the wind guide surface (661) at the windward end is tilted inward, and the wind guide surface (661) at the leeward end is tilted outward.

5. The double-impeller axial magnetic wind turbine generator according to claim 3, characterized in that: The adaptive adjustment component includes two guide rails (63) and two sliding limit components. A plurality of connecting rods are installed on the inner sides of the two guide rails (63), and the two guide rails (63) are installed on the outer wall of the rotating drum (64) through the plurality of connecting rods. The portion of the guide rail (63) corresponding to the blades (66) in the windward direction is recessed inwardly. A wind force adjustment component is provided on the outer wall of the rotating drum (64) for keeping the recessed portion on the guide rail (63) always corresponding to the position of the blades (66) in the windward direction. The two guide rails (63) are respectively located above and below the wind force adjustment component. The two sliding limit components are respectively provided at the bottom ends of the plurality of connecting rods (62) located above and at the top ends of the plurality of connecting rods (62) located below, and the two sliding limit components are symmetrical to each other. The sliding limit component located at the top includes a plurality of slide grooves (68), and the plurality of slide grooves (68) are opened at the bottom ends of the plurality of connecting rods (62). The inner wall of the slide groove (68) is provided with a through hole at the outward end, and a slider (610) is slidably connected inside. The inward end of the slider (610) is installed with a spring (69), and is connected to the inner wall of the slide groove (68) through the spring (69). The slider (610) is a counterweight block, and an extension block is installed at the bottom end thereof near the position of the spring (69). The extension block is located outside the slide groove (68), and is rotatably connected to a roller (611) on the inward side. The roller (611) is arranged in contact with the outer wall of the corresponding guide rail (63). One of the sliders (610) corresponding to the position of the recessed portion on the guide rail (63) has its outward end located in the slide groove (68), and the outward ends of the remaining plurality of sliders (610) are in contact with the inner wall of the corresponding blade (66).

6. The double-impeller axial magnetic wind turbine generator according to claim 5, characterized in that: The wind force regulating component comprises two paddle boards (65), the two paddle boards (65) are symmetrically mounted on the outer wall of the rotating drum (64), and a connecting plate is mounted between the two paddle boards (65), and the recessed portion on the guide rail (63) is located outside one of the paddle boards (65).

7. The double-impeller axial magnetic wind turbine generator according to claim 5, characterized in that: The rotation limit assembly includes two connecting blocks, which are respectively installed on the outward ends of the corresponding two connecting rods (62) away from the through-opening position, and the two connecting blocks are provided with a rotation groove on the opposite side. The opposite side of the two rotation grooves is rotatably connected to a boss (662), the inward end of the boss (662) contacts the inner wall of the rotation groove, and the outward end is fixedly connected to the corresponding blade (66).

8. The double-impeller axial magnetic wind turbine generator according to claim 2, characterized in that: The lubrication and heat dissipation mechanism includes an oil nozzle (21), which is fixedly mounted on the inner top wall of the oil tank (2). The bottom end of the main shaft (9) passes through the inner bottom wall of the protective shell and is rotatably connected to the oil nozzle (21) through a bearing (91) located below the main shaft (9). The bottom ends of the main shaft (9) and the oil nozzle (21) are both provided with a transport groove, and the two transport grooves are interconnected. The top wall of the transport groove on the main shaft (9) is rotatably connected to a rotating rod (92), and a plurality of oil outlet holes (93) are evenly penetrated on the inner side wall thereof. The main shaft ( The transport trough on the oil nozzle (21) is connected to the inside of the protective shell through the oil outlet hole (93). A driving part for driving the rotating rod (92) to rotate is provided in the main shaft (9). An auger blade is installed on the outer wall of the rotating rod (92). The auger blade is located in the two transport troughs. A sieve plate (22) is installed at the bottom opening of the transport trough on the oil nozzle (21). A plurality of return oil pipes (41) are evenly penetrated and fixedly installed near the top position of the outer wall of the protective shell. The bottom end of the return oil pipe (41) penetrates and is fixedly installed on the top wall of the oil tank (2).

9. The double-impeller axial magnetic wind turbine generator according to claim 8, characterized in that: The water cooling mechanism also includes a water collecting frame (3), which is fixedly mounted on the top of the oil tank (2) and has cooling water inside. A water pipe (32) is mounted on the outer wall of the water collecting frame (3), and an oil return pipe (41) is located inside the water collecting frame (3).

10. The double-impeller axial magnetic wind turbine generator according to claim 9, characterized in that: The height of the water collecting frame (3) is lower than that of the axial flux generator (4), and a temperature sensor (31) is installed on the top.

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