Weak wind power generation system

Abstract

The invention belongs to the technical field of weak wind power generation, and particularly relates to a weak wind power generation system which comprises two transmission shafts, one transmission shaft is an inner rotating shaft, the other transmission shaft is an outer rotating shaft, a conical protruding head is fixedly connected to the inner rotating shaft, and fan blades are fixedly connected to the positions, located on the side face of the conical protruding head, of the inner rotating shaft. Two installation discs are fixedly connected to the outer rotating shaft, three installation supports are fixedly connected to the periphery of each installation disc, matrix hollowed-out holes with different sizes are formed in the installation supports, spiral blades are fixedly connected to one ends of the installation supports, and spiral pieces are fixedly installed between the two installation supports. Due to the unique structural design, the wind energy capturing efficiency is effectively improved, and stable operation can be achieved in the weak wind environment. By optimizing transmission and power generation assemblies, energy loss is reduced, and efficient electric energy conversion is guaranteed. The miniature design facilitates installation and transportation, can be widely applied to multiple fields, and provides powerful support for solving the energy problem.

Description

Technical Field

[0001] The present invention relates to the technical field of weak wind power generation, and in particular to a weak wind power generation system. Background Art

[0002] Against the backdrop of growing energy demand and the gradual depletion of traditional energy, the development of renewable energy has become a global consensus, and small-scale weak wind power generation technology has emerged.

[0003] Traditional wind power generation usually focuses on large wind farms and relies on strong wind resources. Its equipment is large, installation is complex, site requirements are strict, and the initial investment cost is high, and later maintenance is difficult. However, in daily life and many specific fields, there are a large number of low wind speed areas, such as urban residential areas, small villages in mountainous areas, remote islands, and some industrial plant areas. The annual average wind speed in these places is often low, and there are very few strong wind periods, making it difficult for conventional wind power generation equipment to operate efficiently there.

[0004] Small-scale weak wind power generation technology is aimed at this market gap. Compared with large-scale wind power, it has significant advantages. First, the miniaturization of the equipment makes it extremely convenient to transport and install. It does not require the assistance of large professional equipment. Ordinary manpower or small tools can complete the assembly, and it can be flexibly deployed in various narrow and complex terrains. Secondly, it is cost-effective. On the one hand, it reduces the cost of equipment manufacturing and raw materials, and on the other hand, it reduces the operating costs such as installation and maintenance, providing a feasible energy solution for users with limited funds and small communities.

[0005] From a multi-purpose perspective, small-scale weak wind power generation can provide partial electricity support for households in the civilian field, which can be used for lighting, operation of small household appliances, etc., to alleviate the pressure on electricity consumption; in agricultural production, it can power irrigation equipment and small agricultural processing machinery, and help the development of modern agriculture; in field operation scenarios, such as geological exploration and ecological monitoring stations, it can ensure basic electricity demand and maintain equipment operation; in emergency rescue, it can be used as a temporary power source and quickly built to charge rescue equipment and lighting facilities, thereby improving rescue efficiency.

[0006] Although small-scale weak wind power generation has broad prospects, it still faces some technical challenges. For example, how to further improve the efficiency of wind energy capture under weak wind conditions, optimize the transmission system to reduce energy loss, and improve the stability and durability of power generation equipment. These problems need to be solved urgently to promote the maturity of small-scale weak wind power generation technology and achieve wider application. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies of the prior art, the present invention provides a weak wind power generation system, which solves the problems raised in the above background technology.

[0009] (II) Technical solution

[0010] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0011] A weak wind power generation system comprises two transmission shafts, one of which is an inner rotating shaft, and the other is an outer rotating shaft, the inner rotating shaft is fixedly connected with a conical convex head, the inner rotating shaft is fixedly connected with a fan blade on the side of the conical convex head, the outer rotating shaft is fixedly connected with two mounting plates, the mounting plate is fixedly connected with three mounting brackets around, the mounting bracket is provided with matrix hollow holes of different sizes, one end of the mounting bracket is fixedly connected with a spiral blade, a spiral sheet is fixedly installed between the two mounting brackets, the A ball is rotatably connected between the inner shaft and the outer shaft, the center of gravity of the ball is engaged in the outer shaft, and a slot for an engagement position is provided in the outer shaft. The inner shaft is provided with a transmission slot for rotatably engaging with the outer surface of the ball, a first rotor is fixedly connected to the bottom of the outer shaft, the inner shaft extends through and is fixedly connected to a second rotor at a point outside the outer shaft, stators are provided on the outside of the first rotor and the second rotor, the stator is fixedly installed in the base, and the inner shaft is rotatably connected to the base through a thrust ball bearing for support.

[0012] Furthermore, the spiral blades are connected to two different mounting brackets, three of which are provided for staggered connection.

[0013] Furthermore, the spiral blade is a long strip-shaped object with a curvature, a continuous curved shape, gradually bending and extending from one end to the other end, and the middle part also has a flat curvature.

[0014] Furthermore, the spiral sheet is in a spiral shape, which is formed by multiple layers of arc structures intertwined with each other, and the curvature and direction of each layer of arc are similar, and the whole presents a continuous, spiraling upward shape.

[0015] Furthermore, outer end surfaces of the first rotor on the outer rotating shaft and the second rotor outside the inner rotating shaft are flush.

[0016] Furthermore, the ball is made of high-strength wear-resistant material, and its surface smoothness reaches Ra0.2μm, so as to ensure smooth engagement and rotation between the transmission groove and the clamping groove, reduce friction loss, and extend service life.

[0017] Furthermore, the stator is composed of an iron core with high magnetic permeability and a multi-turn coil wound thereon, has good electrical conductivity and temperature resistance, and can efficiently convert the change in magnetic flux generated by the rotation of the rotor into electrical energy.

[0018] Furthermore, the first rotor and the second rotor are both made of permanent magnet materials to ensure that a sufficiently strong and stable magnetic field can be generated even in a weak wind environment, and cooperate with the stator to achieve efficient power generation.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention provides a weak wind power generation system, which has the following beneficial effects:

[0021] In the present invention, in terms of wind energy capture, the structures such as the conical convex head, fan blades, spiral blades and spiral sheets work together, and the unique design can effectively cope with weak wind environments, increase the contact area with the airflow and the effect of the action, and significantly improve the efficiency of wind energy capture; in terms of the transmission system, the high-precision design of the ball and the reasonable connection of the inner and outer shafts greatly reduce the friction loss, ensure the stable transmission of power, and reduce energy loss; in terms of power generation, the first rotor and the second rotor made of permanent magnet material are matched with the stator composed of a high magnetic permeability iron core and multi-turn coils, which can generate a stable and strong magnetic field even in weak winds, efficiently convert mechanical energy into electrical energy, and ensure stable power generation; moreover, the overall structure of the system is compact and miniaturized, easy to transport and install, and can be flexibly deployed in a variety of terrains. Whether it is civil lighting, agricultural production, field operations or emergency rescue, it can effectively alleviate the pressure on electricity consumption, providing an efficient, convenient and economical solution for energy utilization, and has great application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the mounting plate, mounting bracket and spiral blade mounting structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the spiral sheet structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the base of the present invention;

[0026] Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point A in the middle.

[0027] In the figure: 1. inner rotating shaft; 2. conical boss; 3. fan blade; 4. outer rotating shaft; 5. mounting plate; 6. mounting bracket; 7. spiral blade; 8. spiral sheet; 9. ball bearing; 10. slot; 11. transmission slot; 12. first rotor; 13. second rotor; 14. stator; 15. base. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example

[0030] like Figure 1-5 As shown, a weak wind power generation system proposed in one embodiment of the present invention comprises two transmission shafts, one of which is an inner rotating shaft 1, and the other is an outer rotating shaft 4;

[0031] The inner shaft 1 penetrates the outer shaft 4 and extends to a certain position outside the outer shaft 4, and is connected to the base 15 through a thrust ball bearing to realize rotation support. A transmission groove 11 is provided on its surface for cooperating with the ball 9 to realize a specific transmission function.

[0032] As a key power transmission component within the system, the fan blades 3 capture the rotational mechanical energy converted from wind energy and transmit it inward to the second rotor 13. At the same time, through the coordinated rotation relationship with the outer shaft 4, the power transmission stability of the entire system is guaranteed. During the rotation process, the thrust ball bearing effectively bears the axial load, ensuring the stable rotation of the inner shaft 1 and reducing the adverse effects of axial displacement on the system.

[0033] The conical protrusion 2 is fixed on the inner rotating shaft 1 and is located on the side of the fan blade 3. The conical protrusion 2 is conical in shape and has a specific geometric curved surface structure.

[0034] In a weak wind environment, the conical convex head 2 can guide and converge the surrounding airflow, changing the original flow direction of the airflow so that it can impact the fan blade 3 more concentratedly, effectively increasing the wind force locally received by the fan blade 3, thereby improving the rotation efficiency of the fan blade 3 in weak wind conditions and enhancing the system's ability to capture wind energy.

[0035] The fan blade 3 is mounted on the inner rotating shaft 1 and is located on the side of the conical boss 2. The shape and size of the fan blade 3 are optimized and have good aerodynamic performance.

[0036] It is directly in contact with weak wind, generates rotation torque under the action of wind force, drives the inner shaft 1 to rotate, realizes the initial conversion of wind energy to mechanical energy, and is one of the core components of the entire power generation system to capture wind energy. Its reasonable design ensures efficient response at low wind speeds, providing a power source for subsequent energy conversion.

[0037] The bottom of the outer shaft 4 is fixedly connected to the first rotor 12, and is engaged and rotatably connected with the inner shaft 1 through the ball 9. Two mounting plates 5 are fixed on the outside thereof for mounting other wind energy capture auxiliary structures.

[0038] On the one hand, it forms a double-layer shaft structure together with the inner shaft 1, and the coordinated rotation transmits power, thereby enhancing the stability and reliability of the system. On the other hand, through the externally connected mounting plate 5 and related structures, it further captures wind energy, expands the scope of wind energy utilization of the system, and improves the overall power generation efficiency. At the same time, the power transmitted by the inner shaft 1 is effectively transmitted to the first rotor 12, driving it to rotate and participate in the power generation process.

[0039] The mounting plate 5 is fixed on the outer rotating shaft 4 and has a disc-shaped structure. Three mounting brackets 6 are evenly distributed around the mounting plate 5 to provide a stable connection foundation for the mounting brackets 6 .

[0040] As an intermediate connecting component, it ensures that the mounting bracket 6 and the spiral blades 7 and spiral sheets 8 thereon can be stably installed around the outer rotating shaft 4, ensuring that these wind energy capturing structures maintain the correct position and angle under different wind speed and wind direction conditions, thereby effectively exerting their function of capturing wind energy and maintaining the normal operation of the system.

[0041] The mounting bracket 6 is fixed around the mounting plate 5, one end of which is connected to the spiral leaf 7, and the spiral piece 8 is installed between the two mounting brackets 6. The bracket is provided with matrix hollow holes of different sizes, which has unique structural strength and lightweight design.

[0042] Through the design of matrix hollow holes of different sizes, the weight is effectively reduced while ensuring the strength of the structure, and the overall rotational inertia of the system is reduced, so that the system can respond more sensitively to the drive of weak wind. At the same time, a reliable installation position is provided for the spiral blades 7 and the spiral pieces 8, so that they can fully contact the airflow, transfer wind energy to the outer shaft 4, and promote the rotation and power generation of the system.

[0043] The spiral blade 7 is connected to two different mounting brackets 6 and is in the form of an elongated object with a curvature and a continuous curved shape. The curvature gradually changes from the middle to the two ends, and the three spiral blades 7 are staggeredly connected.

[0044] In a weak wind environment, its unique shape and staggered connection method can increase the contact area and action time with the airflow, effectively capture airflows of different directions and speeds, and convert wind energy into power to drive the outer rotating shaft 4 to rotate. Compared with traditional blade design, it is more conducive to improving wind energy utilization at low wind speeds and enhancing the power generation performance of the system.

[0045] The spiral sheet 8 is formed by multiple layers of arc-shaped structures intertwined with each other, presenting a spiral shape as a whole, and is fixedly installed between two mounting brackets 6, with a certain pitch and thickness distribution.

[0046] When the airflow passes through, the spiral structure of the spiral blade 8 can guide the airflow to flow along a specific path, so that the airflow continuously acts on the spiral blade 8, generating a stable driving force, further improving the rotation efficiency of the outer shaft 4. Cooperating with the spiral blade 7, a multi-level wind energy capture system is formed to enhance the energy conversion capability of the system under weak wind conditions.

[0047] The ball 9 is made of high-strength wear-resistant material, and its surface smoothness reaches Ra0.2μm. Its center of gravity is engaged in the groove 10 of the outer shaft 4, and its outer surface is engaged with the transmission groove 11 of the inner shaft 1 for rotation.

[0048] It plays a key role in supporting and reducing friction between the inner and outer shafts 4. It ensures that the inner shaft 1 and the outer shaft 4 remain smooth during relative rotation, reduces energy loss caused by friction, and improves the transmission efficiency of the system. At the same time, its high-precision manufacturing process and reasonable center of gravity design ensure stability and reliability during long-term operation and extend the service life of the system.

[0049] The clamping groove 10 is arranged inside the outer rotating shaft 4, and is precisely matched with the center of gravity of the ball 9, and has a specific geometric shape and dimensional accuracy.

[0050] Cooperating with the ball 9, it provides a stable installation position and rotation constraint for the ball 9, ensuring that the ball 9 always maintains the correct position and movement trajectory during the rotation of the inner and outer shafts 4, preventing the ball 9 from shifting or falling off, and ensuring the stability and reliability of the system transmission.

[0051] The transmission groove 11 is located on the surface of the inner shaft 1 and is matched with the outer surface shape of the ball 9 to form a tight engagement rotation connection with certain depth and width tolerance requirements.

[0052] As the transmission interface between the inner shaft 1 and the ball 9, the rotation of the inner shaft 1 is transmitted to the outer shaft 4 through the ball 9, thereby realizing efficient power transmission. Its reasonable design ensures that the transmission between the inner shaft 1 and the ball 9 is stable and reliable under different working conditions, reducing energy loss and mechanical vibration.

[0053] The first rotor 12 is fixedly connected to the bottom of the outer shaft 4 and is made of permanent magnet material. Its outer end surface is flush with the outer end surface of the second rotor 13 and has a specific magnetic pole distribution and magnetic field strength.

[0054] When the outer shaft 4 is driven to rotate by weak wind, the outer shaft 4 rotates synchronously, and the stable magnetic field generated by the permanent magnet interacts with the stator 14, cutting the magnetic lines of force of the stator 14 coil to generate induced electromotive force, realizing the conversion of mechanical energy into electrical energy, and is an important part of the power generation system. Its synergistic effect with the second rotor 13 enhances the effect of the magnetic field and improves the power generation efficiency.

[0055] The second rotor 13 is fixedly connected to the portion of the inner shaft 1 extending to the outside of the outer shaft 4, and is also made of permanent magnet material. It is fixed relative to the first rotor 12 and its outer end surface is flush with the first rotor 12, and the magnetic poles are arranged in order.

[0056] The inner shaft 1 rotates with the rotation of the inner shaft 1, and forms a stable magnetic field environment around the stator 14 together with the first rotor 12. During the rotation process, electromagnetic induction occurs with the stator 14, converting the mechanical energy transmitted by the inner shaft 1 into electrical energy, increasing the power generation of the power generation system and improving the overall energy conversion efficiency of the system.

[0057] The stator 14 is composed of an iron core with high magnetic permeability and a multi-turn coil wound thereon, and is fixedly installed in the base 15 , and has good electromagnetic performance and structural stability.

[0058] As a stationary part of the power generation system, the high magnetic permeability of the iron core is used to enhance the magnetic field strength. When the first rotor 12 and the second rotor 13 rotate, the coil cuts the magnetic lines of force to generate induced current, realizing the function of efficiently converting the mechanical energy of the rotor into electrical energy. Its stable structure and excellent electromagnetic performance ensure the stability and continuity of electrical energy conversion.

[0059] The base 15 provides a stable supporting foundation for the entire power generation system, and a stator 14 is installed inside, which is connected to the inner rotating shaft 1 through a thrust ball bearing and has sufficient strength and stability.

[0060] The stator 14 is supported and fixed to ensure that it maintains a stable position during the operation of the system, and provides reliable rotation support for the inner shaft 1, thereby ensuring the structural integrity and operational stability of the entire power generation system. At the same time, the design of the base 15 can effectively disperse the vibration and stress generated during the operation of the system, and protect the various components of the system from external interference and damage.

[0061] Through the analysis of the design characteristics and functions of each structural component of the weak wind power generation system, it can be seen that the system effectively improves the wind energy capture efficiency and power conversion efficiency in a weak wind environment through the coordinated cooperation of various components, and has good application prospects and practical value.

[0062] Under the action of wind, the blades 3 on the inner shaft 1 and the spiral blades 7 and spiral sheets 8 on the outer shaft 4 start to rotate. The inner shaft 1 and the outer shaft 4 achieve relative rotation through the ball 9 in the cooperation of the clamping groove 10 and the transmission groove 11 to reduce friction. The first rotor 12 at the bottom of the outer shaft 4 and the second rotor 13 at the extension of the inner shaft 1 rotate accordingly. In the magnetic field generated by the stator 14, the rotation of the rotor causes the change of magnetic flux. According to the principle of electromagnetic induction, the coil in the stator 14 generates an induced electromotive force, thereby realizing power generation. During the whole process, the inner shaft 1 relies on the thrust ball bearing to be stably supported in the base 15 to ensure the normal operation of the system.

[0063] like Figure 2 As shown, in some embodiments, the spiral blades 7 are connected to two different mounting brackets 6, and three of them are provided for staggered connection; from the perspective of wind energy capture, the three spiral blades 7 can increase the contact area and action points with the airflow. Under weak wind conditions, the airflow is more dispersed and has a low energy density. Multiple spiral blades 7 can capture the airflow at different spatial positions, and compared with a single or a small number of blades, they can more fully utilize the surrounding wind energy and improve energy collection efficiency.

[0064] The staggered connection makes the spiral blades 7 form an asymmetric layout in space. When the airflow blows, the force time and magnitude of the spiral blades 7 at different positions are different, and this difference will prompt the outer shaft 4 to produce a more continuous and stable torque. The traditional symmetrical layout blades may have force balance and rotation obstruction under certain wind directions and wind speeds, but the staggered connection can effectively avoid this, enhance the system's adaptability to changes in wind directions and wind speeds, ensure the stable rotation of the outer shaft 4, and thus improve the power generation performance of the entire power generation system in complex weak wind environments.

[0065] like Figure 2 As shown, in some embodiments, the spiral blade 7 is a long strip-shaped object with a curvature, a continuous curved shape, gradually curved from one end to the other end, and also has a flat curvature in the middle; from the perspective of aerodynamic principles, its unique curvature and curved shape can effectively change the flow characteristics of the airflow on the blade surface. In a weak wind environment, the airflow speed is relatively low and unstable. This curved blade can guide the airflow to flow more smoothly along its surface, and compared with straight blades, it can reduce the occurrence of airflow separation and turbulence. When the airflow flows through the spiral blade 7, due to the curvature of the blade, the airflow will form a certain pressure difference on the blade surface, thereby generating greater lift, driving the spiral blade 7 to rotate, and thereby improving the efficiency of converting wind energy into mechanical energy.

[0066] From the perspective of structural strength and stability, the continuous bending shape makes the spiral blade 7 have better structural rigidity. When facing wind forces of different directions and intensities, it can better disperse stress, reduce the risk of blade deformation or damage due to wind impact, ensure stable operation in a long-term weak wind environment, reduce system maintenance costs and downtime, and improve the reliability and durability of the entire power generation system.

[0067] like Figure 3As shown, in some embodiments, the spiral blade 8 is a spiral shape, which is formed by multiple layers of arc structures intertwined with each other, and the curvature and direction of each layer of arc are similar, and the whole presents a continuous, spiraling upward shape; in terms of wind energy capture, the spiral shape enables the spiral blade 8 to more effectively utilize the energy of the airflow. When weak wind flows through, its special shape guides the airflow to flow along the spiral path, increasing the action time and contact area between the airflow and the spiral blade 8. Compared with a flat or simple shape structure, this design can better capture the kinetic energy of the weak airflow and convert it into mechanical energy to drive the outer shaft 4 to rotate, thereby improving the wind energy utilization efficiency of the system at low wind speeds.

[0068] From the perspective of structural stability and mechanical properties, the multi-layer arc structure is intertwined to form a stable overall structure. When facing a complex wind environment, it can disperse the wind load it bears and enhance its own wind resistance. The similar curvature and direction of each layer of arc ensure that the structure is evenly stressed, avoiding the occurrence of local stress concentration, making the spiral blades 8 less likely to be damaged during long-term operation, ensuring the stability and reliability of the system, reducing problems such as power generation interruption or efficiency reduction due to component failure, and helping to improve the performance and service life of the entire weak wind power generation system.

[0069] like Figure 4 As shown, in some embodiments, the outer end faces of the first rotor 12 on the outer shaft 4 and the second rotor 13 outside the inner shaft 1 are flush; from the perspective of magnetic field distribution, the flush end faces can ensure that during the rotation, the magnetic field generated by the two rotors is more evenly and stably distributed in space. In the power generation process, the interaction between a stable and uniform magnetic field and the stator 14 is one of the key factors in achieving efficient power conversion. If the rotor end faces are not flush, it may cause uneven local strength of the magnetic field, affect the cutting effect of the magnetic lines of force, and thus reduce the power generation efficiency.

[0070] In terms of the coordination of the mechanical structure, the flush design is conducive to the smooth operation of the system. When the inner shaft 1 and the outer shaft 4 rotate under the drive of wind, the two rotors can work with the stator 14 in a coordinated manner to reduce the vibration and unbalanced force caused by the difference in rotor positions. This stability can reduce the wear of system components and extend the service life of the equipment. It also helps to improve the reliability of the entire power generation system and ensure continuous and stable power generation in weak wind environments.

[0071] like Figure 5As shown, in some embodiments, the ball 9 is made of high-strength wear-resistant material, and its surface smoothness reaches Ra0.2μm, so as to ensure smooth engagement and rotation between the transmission groove 11 and the clamping groove 10, reduce friction loss, and extend service life; in terms of transmission performance, the high-strength wear-resistant material ensures that the ball 9 is not easily deformed and worn when it is subjected to the pressure and friction generated by the rotation of the inner and outer shafts 4 for a long time. This allows the ball 9 to always maintain a good geometric shape, ensure a close and stable fit with the transmission groove 11 and the clamping groove 10, maintain a stable transmission relationship, effectively transmit torque, ensure the coordinated rotation between the inner shaft 1 and the outer shaft 4, and make the system mechanical energy transmission smooth, thereby maintaining the stable operation of the power generation system.

[0072] From the perspective of energy loss, the high smoothness surface of Ra0.2μm greatly reduces the friction coefficient between the ball 9 and the transmission groove 11 and the card groove 10. During the operation of the system, the friction loss is greatly reduced, more wind energy conversion mechanical energy can be effectively utilized, the overall energy conversion efficiency of the system is improved, and energy waste and component performance degradation caused by frictional heat and other problems are avoided. The service life of the ball 9 and the entire transmission system is extended, the equipment maintenance cost and replacement frequency are reduced, and the economy and practicality of the weak wind power generation system are improved.

[0073] like Figure 4 As shown, in some embodiments, the stator 14 is composed of an iron core with high magnetic permeability and a multi-turn coil wound thereon, has good electrical conductivity and temperature resistance, and can efficiently convert the magnetic flux changes generated by the rotation of the rotor into electrical energy; the high magnetic permeability iron core can effectively enhance the magnetic field strength. When the rotor rotates, the magnetic field around it is more concentrated and stable due to the action of the iron core, so that the magnetic lines of force pass through the coil more densely. The multi-turn coil increases the chance of magnetic line cutting, and according to the principle of electromagnetic induction, more magnetic flux changes can be converted into induced electromotive force. This structural design greatly improves the efficiency of electric energy conversion and makes full use of the mechanical energy of the rotor rotation.

[0074] Good conductivity ensures that the induced current can be smoothly output and reduces the loss of power transmission. Under weak wind power generation conditions, the system continues to operate and generates heat. The temperature resistance enables the stator 14 to work stably, avoiding the influence of electromagnetic performance and material properties due to temperature increase, ensuring the reliability and continuity of the power conversion process, maintaining the stable operation of the power generation system, and improving the power generation efficiency of the entire system in weak wind environments.

[0075] like Figure 4As shown, in some embodiments, the first rotor 12 and the second rotor 13 are both made of permanent magnet materials to ensure that a sufficiently strong and stable magnetic field can be generated even in a weak wind environment, and cooperate with the stator 14 to achieve efficient power generation; the permanent magnet material itself has stable magnetism, and does not require external continuous power supply to excite the magnetic field. In a weak wind environment, even if the wind speed is low and the energy input is limited, it can still stably generate a magnetic field of sufficient strength. Compared with rotors that require additional excitation devices, the system complexity and energy loss are reduced.

[0076] When the rotor rotates driven by wind, its stable magnetic field interacts with the coil of the stator 14. The stable magnetic field ensures that the process of magnetic lines cutting the coil is continuous and regular under different wind speed fluctuations, so that the generation of induced electromotive force remains stable, thereby achieving efficient power conversion. This is particularly critical for weak wind power generation systems, because weak wind itself has low energy density. Only by ensuring the stability and strength of the magnetic field can we fully utilize limited wind energy resources, improve power generation efficiency, enhance the practicality and reliability of the system under low wind speed conditions, and provide strong support for its application in weak wind areas such as urban residential areas and small villages in mountainous areas.

[0077] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A weak wind power generation system, comprising two transmission shafts, characterized in that: One of the transmission shafts is an inner rotating shaft (1), and the other transmission shaft is an outer rotating shaft (4). The inner rotating shaft (1) is fixedly connected with a conical convex head (2). The inner rotating shaft (1) is fixedly connected with a fan blade (3) on the side of the conical convex head (2). The outer rotating shaft (4) is fixedly connected with two mounting plates (5). The mounting plate (5) is fixedly connected with three mounting brackets (6) around it. The mounting bracket (6) is provided with a matrix of hollow holes of different sizes. One end of the mounting bracket (6) is fixedly connected with a spiral blade (7). A spiral sheet (8) is fixedly installed between the two mounting brackets (6). The inner rotating shaft (1) and the outer rotating shaft (4) are engaged and rotatably connected. A ball (9), the center of gravity of the ball (9) is engaged in the outer shaft (4), and a slot (10) at an engaging position is provided in the outer shaft (4); a transmission slot (11) engaged and rotated with the outer surface of the ball (9) is provided on the inner shaft (1); a first rotor (12) is fixedly connected to the bottom of the outer shaft (4); the inner shaft (1) extends through and is fixedly connected to a second rotor (13) at a point outside the outer shaft (4); stators (14) are provided outside the first rotor (12) and the second rotor (13); the stators (14) are fixedly installed in a base (15); the inner shaft (1) is rotatably connected to the base (15) through a thrust ball bearing for support.

2. A weak wind power generation system according to claim 1, characterized in that: The spiral blades (7) are connected to two different mounting brackets (6), three of which are provided for staggered connection.

3. A weak wind power generation system according to claim 2, characterized in that: The spiral blade (7) is a long strip-shaped object with a curvature, a continuous curved shape, gradually curved from one end to the other end, and the middle part also has a flat curvature.

4. A weak wind power generation system according to claim 1, characterized in that: The spiral sheet (8) is in a spiral shape, and is formed by multiple layers of arc structures intertwined with each other. The curvature and direction of each layer of arc are similar, and the whole presents a continuous, spiraling upward shape.

5. A weak wind power generation system according to claim 1, characterized in that: The outer end surfaces of the first rotor (12) on the outer rotating shaft (4) and the second rotor (13) outside the inner rotating shaft (1) are flush.

6. A weak wind power generation system according to claim 1, characterized in that: The ball (9) is made of high-strength wear-resistant material, and its surface smoothness reaches Ra0.2μm, so as to ensure smooth engagement and rotation between the transmission groove (11) and the clamping groove (10), reduce friction loss, and extend service life.

7. A weak wind power generation system according to claim 1, characterized in that: The stator (14) is composed of an iron core with high magnetic permeability and a multi-turn coil wound thereon, has good electrical conductivity and temperature resistance, and can efficiently convert the change in magnetic flux generated by the rotation of the rotor into electrical energy.

8. A weak wind power generation system according to claim 1, characterized in that: The first rotor (12) and the second rotor (13) are both made of permanent magnet material to ensure that a sufficiently strong and stable magnetic field can be generated even in a weak wind environment, and cooperate with the stator (14) to achieve efficient power generation.

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