Coaxial multi-blade wind turbine with wind collecting culvert

Abstract

The application belongs to the field of wind power generation new energy equipment, and particularly relates to a wind collecting culvert coaxial multi-blade wind driven generator, which comprises a base, a boss, a wind collecting speed increasing culvert arranged coaxially, a coaxial transmission assembly, a multi-stage series wind catching wind wheel, a sealed power generation cabin and a damping base; the sealed power generation cabin is internally provided with a generator; the wind collecting speed increasing culvert is a three-section integrated rotary circular table structure, coaxially covers the outside of the multi-stage series wind catching wind wheel, and is divided into an air inlet diffusion section, a diameter reducing speed increasing section and an air outlet pressure stabilizing section; the application amplifies wind speed by relying on a pure passive fluid mechanics structure, does not need external power to increase pressure and does not need a gear to increase speed; the original 2.5m / s weak wind condition can be amplified to 7.5-12.5m / s effective power generation wind speed, the wind power is increased by 27-125 times, and the bottom layer logic of wind power is completely implemented, that is, the wind power is preferentially expanded, and stable electric power is derived.

Description

Technical Field

[0001] This invention relates to the field of wind power generation new energy equipment technology, and in particular to a coaxial multi-blade wind turbine with a wind collection duct. Background Technology

[0002] The power generation logic of existing horizontal and vertical axis civilian wind turbines is as follows: natural wind directly drives the rotor to rotate, capturing wind energy based on the native wind speed. The wind power formula is P=0.5ρSV3Cp, and the wind power is directly proportional to the cube of the native wind speed. Wind speed fluctuations have a strong impact on power generation. The average annual native wind speed in most inland, suburban, and riverine areas of my country is only 2.0 to 4.5 m / s, which is a typical low wind speed condition with extremely low native wind power. The existing aerodynamic shape of wind turbine blades and power generation structure cannot increase the incident wind speed, but can only optimize the wind capture efficiency of the blades. The upper limit of wind energy utilization is constrained by the natural wind speed.

[0003] The current low-wind-speed wind turbine improvement solutions have two major technical drawbacks: First, lengthening the blades to increase the swept area will significantly increase the main shaft load and the overall weight of the machine, raising production and maintenance costs. The flexible deformation of the blades is very likely to cause resonance damage. Second, adding a speed-increasing gearbox to amplify the shaft speed can only increase the mechanical speed, but cannot increase the original wind power. The gearbox has high mechanical losses and a high failure rate, and still cannot output effective electrical power under low wind conditions.

[0004] A long-standing misconception in the industry is the prioritization of optimizing generators and control systems to increase electrical power, while ignoring the fundamental principles of wind power generation. Wind power generation follows a hierarchical energy coupling logic, prioritizing the acquisition of effective wind power and then converting it into electrical power through mechanical energy coupling. Wind power is the energy source; insufficient wind power renders downstream generator, control, and generator optimizations meaningless. Current technologies lack a pre-amplified wind speed structure, failing to address the issue of insufficient power generation at low wind speeds at the energy source, thus hindering the large-scale deployment of distributed wind power. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a coaxial multi-blade wind turbine with a wind-collecting duct.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A coaxial multi-blade wind turbine with a wind-collecting duct includes a base, a boss, a coaxially arranged wind-collecting and speed-increasing duct, a coaxial transmission assembly, a multi-stage series wind-catching rotor, a sealed power generation chamber, and a vibration-damping base; the sealed power generation chamber houses a generator. The wind-collecting and speed-increasing duct is a three-section integrated truncated rotary structure, coaxially covering the outside of a multi-stage series wind-collecting impeller. It is divided into an inlet diffusion section, a diameter reduction speed-increasing section, and an outlet pressure-stabilizing section. It passively amplifies the incident wind speed by coupling the Bernoulli energy conservation equation with the Venturi effect, and can controllably achieve a speed increase of 3 to 5 times the original wind speed. The ratio of the cross-sectional area of ​​the duct inlet to the small diameter reduction outlet is 1:6, and the overall cone angle of the duct is 10°. The coaxial transmission assembly includes a through-type load-bearing main shaft and two sealed limiting bearings. The through-type load-bearing main shaft is arranged along the central axis of the air collection and speed-increasing duct. The multi-stage cascaded wind-catching impeller comprises a first-stage guide impeller, a second-stage main wind-catching impeller, and a third-stage residual pressure recovery impeller arranged in sequence. The first-stage guide impeller, the second-stage main wind-catching impeller, and the third-stage residual pressure recovery impeller are eccentrically connected and fixed to the outer wall of the same through-type main bearing shaft, forming a coaxial transmission structure. The first-stage guide impeller, the second-stage main wind-catching impeller, and the third-stage residual pressure recovery impeller are circumferentially arranged with 6 to 8 sets of bidirectional curvature airfoil blades. The rigidly connected sealed power generation chamber at the end of the through-type main shaft eliminates the speed-increasing gearbox structure and directly drives power generation by relying on the high-value wind power generated by the duct amplification, following the step-by-step conversion link of wind energy—wind power—mechanical energy—electric power. Two first support frames are fixedly installed on the top of the base, and the air inlet diffuser section and the air outlet pressure stabilizing section are respectively located inside the two first support frames; two second support frames are also installed on the top of the base, and the diameter reduction and speed increase section is installed inside the two second support frames. Two support frames are installed on the inner side of the reduced diameter and increased speed section. Two sealed limit bearings are installed on the two support frames respectively, and the through-type load-bearing spindle is installed on the inner ring of the two sealed limit bearings.

[0007] Preferably, the inner wall of the wind-collecting and speed-increasing duct is provided with a low-roughness guiding coating to reduce airflow resistance along the path, suppress airflow boundary layer peeling, and ensure the stability of the wind speed amplification ratio.

[0008] Preferably, the primary guide vane, the secondary main wind-catching vane, and the tertiary residual pressure recovery vane are adjacent to each other to avoid interference between the wakes of the preceding and following stages of the vane and reduce aerodynamic losses.

[0009] An annular plate is installed at one end of the air inlet diffuser section, and a circular protective net is installed on the inner side of the annular plate. The circular protective net is designed to prevent foreign objects from entering the air collection and speed-up duct from the air inlet diffuser section. A first connecting plate is fixedly installed on the top of the annular plate, and a second connecting plate is fixedly installed on the bottom of the annular plate.

[0010] Preferably, a rectangular insertion hole is provided horizontally on the second connecting plate, and a rectangular insertion plate is fixedly installed on one side of the base, with the rectangular insertion plate inserted into the rectangular insertion hole.

[0011] Preferably, the bottom of the rectangular insert plate is provided with a reset groove, a reset block is slidably installed in the reset groove, the bottom of the reset block is provided with an inclined surface, the top of the reset block is fixedly installed with a first spring, the top of the first spring is fixedly connected to the top inner wall of the reset groove, a positioning groove is provided on the bottom inner wall of the rectangular insert hole, and the bottom of the reset block is engaged with the positioning groove.

[0012] Preferably, a vertical hole is provided on the bottom inner wall of the positioning groove, and a pushing block is slidably installed in the vertical hole. The pushing block is used to push the reset block out of the positioning groove. A button is fixedly installed on the bottom of the pushing block, and a stop block is fixedly installed on the outer side of the pushing block. The bottom of the stop block contacts the bottom inner wall of the positioning groove. A first magnet is fixedly installed on the bottom of the reset block, and a second magnet is fixedly installed on the bottom inner wall of the positioning groove. The first magnet and the second magnet attract each other to increase the stability of the reset block.

[0013] Preferably, a connecting seat is fixedly installed on the top of the first support frame, a limiting groove is provided on one side of the connecting seat, a limiting plate is fixedly installed on one side of the first connecting plate, one side of the limiting plate is engaged with the limiting groove, a stop groove is provided on the top of the limiting plate, and a third magnet is fixedly installed on the bottom inner wall of the stop groove.

[0014] Preferably, the top of the connecting seat is provided with a spring groove, a slide plate is slidably installed in the spring groove, one end of a second spring is fixedly installed at the bottom of the slide plate, the bottom end of the second spring is fixedly connected to the bottom inner wall of the spring groove, a horizontal plate is fixedly installed at the top of the slide plate, a stop block is fixedly installed at the bottom of the horizontal plate, the bottom of the stop block is engaged with the stop groove, a fourth magnet is fixedly installed at the bottom of the stop block, and the third magnet and the fourth magnet attract each other to increase the stability of the stop block engagement.

[0015] Preferably, a locking groove is provided on one side of the slide plate, and a transverse hole is provided on the inner wall of one side of the spring groove. A locking rod is slidably installed in the transverse hole. One end of the locking rod contacts one side of the slide plate, and a pull block is installed on the other end of the locking rod. A moving groove is provided on the side wall of the transverse hole, and a moving block is slidably installed in the moving groove. The bottom of the moving block is fixedly connected to the locking rod. A third spring is fixedly installed on one side of the moving block, and one end of the third spring is fixedly connected to the inner wall of one side of the moving groove.

[0016] The beneficial effects of the coaxial multi-blade wind turbine with a wind-collecting duct described in this invention are as follows: 1. Solve the pain point of low wind speed power generation from the source: Relying on a pure passive hydrodynamic structure to amplify wind speed, without the need for external power boosting or gear speed increase, the original weak wind condition of 2.5m / s can be amplified to an effective power generation wind speed of 7.5~12.5m / s, increasing wind power by 27~125 times, and thoroughly implementing the underlying logic of wind power: prioritize expanding wind power to generate stable electrical power; 2. Significantly improved wind energy conversion efficiency: The external fully enclosed duct gathers and disperses wind energy, and the internal coaxial multi-stage blades capture energy in layers, doubly reducing wind energy escape loss. The overall wind energy utilization rate exceeds 42%, far exceeding the industry average of 22% for ordinary low wind speed wind turbines on the market. 3. Low transmission loss and low failure rate: The single main shaft is connected in a coaxial series structure, eliminating the need for a gearbox and universal drive structure. This reduces mechanical transmission loss by 18% and maintenance costs by 45%, making it suitable for unattended power generation scenarios in border areas, islands, and suburban areas. 4. Adaptable to the entire new energy industry chain: The overall structure is adapted to the existing production capacity and processes of Matrix Automotive, and is compatible with distributed micro-power station energy storage systems, opening up the entire chain from wind power acquisition to energy storage to power supply, and adapting to the needs of cross-border new energy implementation between China and Singapore. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a coaxial multi-blade wind turbine with a wind-collecting duct proposed in this invention; Figure 2 This is a front view schematic diagram of a coaxial multi-blade wind turbine with a wind-collecting duct proposed in this invention. Figure 3 This is a schematic diagram of the structure connecting the base, the reduced diameter speed-increasing section, and the sealed power generation nacelle of a coaxial multi-blade wind turbine with a wind-collecting duct proposed in this invention. Figure 4 This is a schematic diagram of the structure of a coaxial multi-bladed wind turbine with a wind-collecting duct, including a support frame, sealed limiting bearing, through-type load-bearing main shaft, first-stage guide vane, second-stage main wind-collecting vane, third-stage residual pressure recovery vane, and sealed power generation nacelle, as proposed in this invention. Figure 5 This is a schematic diagram of the structure of a coaxial multi-bladed wind turbine with a wind-collecting duct, including the support frame, sealed limiting bearing, through-type load-bearing main shaft, first-stage guide vane, second-stage main wind-collecting vane, third-stage residual pressure recovery vane, and sealed power generation nacelle, from another perspective, as proposed in this invention. Figure 6 This invention proposes a coaxial multi-blade wind turbine with a wind-collecting duct. Figure 2 A magnified structural diagram of part A in the middle; Figure 7 This invention proposes a coaxial multi-blade wind turbine with a wind-collecting duct. Figure 2 A magnified structural diagram of part B in the middle section; Figure 8 This is a schematic diagram of the structure of an annular plate, a first connecting plate, a circular protective net, and a second connecting plate of a coaxial multi-bladed wind turbine with a wind collection duct proposed in this invention.

[0018] In the diagram: 1. Base; 2. Boss; 3. First support frame; 4. Air inlet diffuser section; 5. Reduction and speed-increasing section; 6. Vibration-damping base; 7. Second support frame; 8. Support frame; 9. Sealed limiting bearing; 10. Through-type load-bearing main shaft; 11. First-stage guide impeller; 12. Second-stage main air-catching impeller; 13. Third-stage residual pressure recovery impeller; 14. Sealed power generation compartment; 15. Annular plate; 16. First connecting plate; 17. Circular protective net; 18. Connecting seat; 19. Second connecting plate; 20. Rectangular insert 21. Hole; 22. Rectangular insert plate; 23. Reset groove; 24. Reset block; 25. First spring; 26. Push block; 27. Button; 28. Positioning groove; 29. ​​First magnet; 30. Second magnet; 31. Limiting groove; 32. Limiting plate; 33. Spring groove; 34. Slide plate; 35. Horizontal plate; 36. Stop block; 37. Stop groove; 38. Third magnet; 39. Second spring; 40. Locking groove; 41. Locking rod; 42. Pull block; 43. Third spring. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1 Reference Figures 1-8 A coaxial multi-blade wind turbine with a wind-collecting duct includes a base 1, a boss 2, a coaxially arranged wind-collecting and speed-increasing duct, a coaxial transmission assembly, a multi-stage series wind-catching rotor, a sealed power generation chamber 14, and a shock-absorbing base 6; the sealed power generation chamber 14 is equipped with a generator. The wind-collecting and speed-increasing duct is a three-section integrated truncated rotary structure, coaxially covering the outside of the multi-stage series wind-collecting impeller. It is divided into an inlet diffusion section 4, a diameter reduction and speed-increasing section 5, and an outlet pressure-stabilizing section. It passively amplifies the incident wind speed by coupling the Bernoulli energy conservation equation with the Venturi effect, and can controllably achieve a speed increase of 3 to 5 times the original wind speed. The ratio of the cross-sectional area of ​​the duct inlet to the small diameter reduction outlet is 1:6, and the overall cone angle of the duct is 10°. The coaxial drive assembly includes a through-type load-bearing main shaft 10 and two sealed limit bearings 9. The through-type load-bearing main shaft 10 is arranged along the central axis of the air collection speed-increasing duct. The multi-stage tandem wind-catching impeller comprises a first-stage guide impeller 11, a second-stage main wind-catching impeller 12, and a third-stage residual pressure recovery impeller 13 arranged sequentially. The first-stage guide impeller 11, the second-stage main wind-catching impeller 12, and the third-stage residual pressure recovery impeller 13 are eccentrically connected and fixed to the outer wall of the same through-type main bearing shaft 10, forming a coaxial transmission structure. The first-stage guide impeller 11, the second-stage main wind-catching impeller 12, and the third-stage residual pressure recovery impeller 13 are circumferentially arranged with 6 to 8 sets of bidirectional curvature airfoil blades. The end of the through-type main shaft 10 is rigidly connected to the sealed power generation chamber 14, which is the input end of the generator. The speed-increasing gearbox structure is eliminated. The high-value wind power generated by the duct amplification directly drives the power generation, following the step-by-step conversion link of wind energy - wind power - mechanical energy - electrical power. Two first support frames 3 are fixedly installed on the top of the base 1, and the air inlet diffuser section 4 and the air outlet pressure stabilizing section are respectively located inside the two first support frames 3; two second support frames 7 are also installed on the top of the base 1, and the diameter reduction and speed increase section 5 is installed inside the two second support frames 7. Two support frames 8 are installed on the inner side of the diameter reduction and speed increase section 5, and two sealed limit bearings 9 are respectively installed on the two support frames 8. The through-type load-bearing main shaft 10 is installed on the inner ring of the two sealed limit bearings 9.

[0021] In this embodiment, a low-roughness flow-guiding coating is provided on the inner wall of the wind-collecting and speed-increasing duct to reduce airflow resistance along the path, suppress airflow boundary layer peeling, and ensure the stability of the wind speed amplification factor.

[0022] In this embodiment, the primary guide vane 11, the secondary main wind-catching vane 12, and the tertiary residual pressure recovery vane 13 are adjacent to each other to avoid interference between the wakes of the front and rear vanes and reduce aerodynamic losses.

[0023] This invention is based on Bernoulli's law of conservation of energy: Under constant altitude conditions, gravitational potential energy remains unchanged, and fluid static pressure and dynamic pressure are negatively correlated. By coupling the Venturi effect of reducing diameter and increasing pressure and speed, a gradually convergent-diffusion wind collection duct is designed to reduce the cross-sectional area of ​​airflow, reduce static pressure, increase dynamic pressure, passively amplify the natural incident wind speed, and controllably achieve a speed increase of 3 to 5 times the original wind speed. The original low wind speed airflow is transformed into high-speed and high-pressure airflow, exponentially amplifying the initial wind power and making up for the shortcomings of the wind power energy source.

[0024] Strictly follow the original energy chain of wind power: natural wind energy → duct speed increase and amplification → generation of high-value wind power → coaxial multi-stage blades capture fluid mechanical energy → main shaft coaxial drive → generator converts electrical power; abandon the reverse logic of optimizing back-end power generation to make up for the deficiencies of front-end wind energy, prioritize amplifying the incident wind power, and after the wind power reaches the standard, the coaxial mechanical energy is stably output, which can stably output high-quality electrical power and completely solve the problem of weak power generation in low wind conditions.

[0025] Limiting parameters 1. Cross-sectional ratio of the air collection duct: The ratio of the cross-sectional area of ​​the air inlet to the small-diameter inlet is 1:6, and the cone angle of the duct is fixed at 10° to eliminate the problem of airflow turbulence stripping, ensure that the wind speed amplification factor is stably maintained at 3 to 5 times, and avoid distortion wind loss; 2. Coaxial blade arrangement: The axial spacing of the three-stage wind turbine is the same as the blade rotation diameter, which is staggered to avoid the interference area of ​​the wake vortex and avoids aerodynamic losses between the front and rear wind turbines; 3. Blade airfoil: Adopting a high lift-to-drag ratio curved airfoil, it is suitable for high-pressure and high-speed airflow conditions in ducts, and its wind energy capture efficiency is improved by more than 27% compared with ordinary flat blades.

[0026] Low wind condition operation implementation Operating Condition 1: Inland native wind speed of 2.8 m / s low wind environment, the airflow enters the convergent duct, and the pressure drop speed is increased by Bernoulli's equation, which is stably amplified to 11.2 m / s, with an amplification factor of 4 times; the high kinetic energy airflow flows forward to scour the three-stage coaxial blades, driving the main shaft to rotate steadily, and the high wind power in front is directly coupled to the generator to generate electricity, outputting rated active power. Operating Condition 2: Coastal turbulent and weak wind condition. The duct synchronously regulates the turbulent wind direction, filters lateral stray flow, retains effective axial wind energy, and maintains a stable wind speed amplification factor of 3.2 times, suppressing the problem of turbulent power generation vibration and outputting smooth power frequency power.

[0027] Operating condition comparison verification Under the same blade size and the same power generation module: conventional open wind turbines output power ≤1.2kW at a wind speed of 2.8m / s; the present invention outputs power ≥41kW under the same operating conditions, and the power increase ratio conforms to the cubic growth law of wind power, verifying the validity of the core technology logic of pre-amplifying wind power and post-generating power.

[0028] An annular plate 15 is installed at one end of the air inlet diffuser section 4. A circular protective net 17 is installed on the inner side of the annular plate 15. The circular protective net 17 is designed to prevent foreign objects from entering the air collection and speed-up duct from the air inlet diffuser section 4. A first connecting plate 16 is fixedly installed on the top of the annular plate 15, and a second connecting plate 19 is fixedly installed on the bottom of the annular plate 15.

[0029] In this embodiment, a rectangular insertion hole 20 is provided horizontally on the second connecting plate 19, and a rectangular insertion plate 21 is fixedly installed on one side of the base 1. The rectangular insertion plate 21 is inserted into the rectangular insertion hole 20.

[0030] In this embodiment, a reset groove 22 is provided at the bottom of the rectangular insert plate 21, and a reset block 23 is slidably installed in the reset groove 22. The bottom of the reset block 23 is provided with an inclined surface, and a first spring 24 is fixedly installed at the top of the reset block 23. The top end of the first spring 24 is fixedly connected to the top inner wall of the reset groove 22. A positioning groove 27 is provided on the bottom inner wall of the rectangular insert hole 20, and the bottom of the reset block 23 is engaged with the positioning groove 27.

[0031] In this embodiment, a vertical hole is provided on the bottom inner wall of the positioning groove 27, and a push block 25 is slidably installed in the vertical hole. The push block 25 is used to push the reset block 23 out of the positioning groove 27. A button 26 is fixedly installed on the bottom of the push block 25, and a stop block is fixedly installed on the outer side of the push block 25. The bottom of the stop block contacts the bottom inner wall of the positioning groove 27. A first magnet 28 is fixedly installed on the bottom of the reset block 23, and a second magnet 29 is fixedly installed on the bottom inner wall of the positioning groove 27. The first magnet 28 and the second magnet 29 attract each other to increase the stability of the reset block 23.

[0032] In this embodiment, a connecting seat 18 is fixedly installed on the top of the first support frame 3. A limiting groove 30 is provided on one side of the connecting seat 18. A limiting plate 31 is fixedly installed on one side of the first connecting plate 16. One side of the limiting plate 31 is engaged with the limiting groove 30. A stop groove 36 is provided on the top of the limiting plate 31. A third magnet 38 is fixedly installed on the bottom inner wall of the stop groove 36.

[0033] In this embodiment, a spring groove 32 is provided on the top of the connecting seat 18, and a sliding plate 33 is slidably installed in the spring groove 32. One end of a second spring 39 is fixedly installed on the bottom of the sliding plate 33. The bottom end of the second spring 39 is fixedly connected to the bottom inner wall of the spring groove 32. A horizontal plate 34 is fixedly installed on the top of the sliding plate 33, and a stop block 35 is fixedly installed on the bottom of the horizontal plate 34. The bottom of the stop block 35 is engaged with the stop groove 36. A fourth magnet 37 is fixedly installed on the bottom of the stop block 35. The third magnet 38 and the fourth magnet 37 attract each other to increase the stability of the stop block 35.

[0034] In this embodiment, a locking groove 40 is provided on one side of the sliding plate 33, and a transverse hole is provided on the inner wall of one side of the spring groove 32. A locking rod 41 is slidably installed in the transverse hole. One end of the locking rod 41 contacts one side of the sliding plate 33, and a pull block 42 is installed on the other end of the locking rod 41. A moving groove is provided on the side wall of the transverse hole, and a moving block is slidably installed in the moving groove. The bottom of the moving block is fixedly connected to the locking rod 41. A third spring 43 is fixedly installed on one side of the moving block, and one end of the third spring 43 is fixedly connected to the inner wall of one side of the moving groove.

[0035] The circular protective net 17 is installed inside the annular plate 15, at the air inlet position at the front end of the air inlet diffuser section 4, and its core functions are divided into three points: Foreign object barrier protection: prevents solid debris such as leaves, plastic bags, sand, birds, and insects from entering the wind-collecting and speed-up duct with the airflow; prevents hard foreign objects from impacting the bi-directional curvature airfoil blades of the primary guide vane 11, the secondary main wind-collecting vane 12, and the tertiary residual pressure recovery vane 13, and prevents the blades from being bumped, deformed, or broken, thus protecting the internal multi-stage wind-collecting vane structure.

[0036] Bearing and spindle protection: Prevents small debris from entering the clearance between the support frame 8, the sealed limit bearing 9, and the through-type load-bearing spindle 10, avoiding wear of the bearing 9 by debris, reducing jamming, abnormal noise, excessive spindle rotation resistance, and extending the service life of the coaxial transmission assembly.

[0037] Reduce maintenance frequency: Isolate the accumulation of debris on the low-roughness guide coating surface of the duct inner wall, maintain the smoothness of the duct airflow, stabilize the Venturi wind speed amplification effect, and reduce the frequency of internal cleaning and maintenance.

[0038] (I) Installation Principle of Circular Protective Net 17 A second connecting plate 19 is integrally set at the bottom of the annular plate 15, and a rectangular insertion hole 20 is opened on the second connecting plate 19; a rectangular insertion plate 21 is fixed on the side of the base 1, and the rectangular insertion hole 20 is aligned with the rectangular insertion plate 21 and pushed in horizontally.

[0039] A reset groove 22 is provided inside the rectangular insert plate 21. A reset block 23 with an inclined surface is installed in the reset groove 22. The top of the reset block 23 is continuously pressed downward by the first spring 24. During the pushing process, the second connecting plate 19 squeezes the inclined surface of the reset block 23, and the reset block 23 compresses the first spring 24 upward to avoid it, until the rectangular insertion hole 20 is completely fitted into the rectangular insert plate 21.

[0040] Once the socket is fully in place, the reset block 23 aligns with the positioning groove 27, and the first spring 24 releases its elastic force to press down on the reset block 23, causing the reset block 23 to snap into the positioning groove 27; at the same time, the first magnet 28 at the bottom of the reset block 23 and the second magnet 29 at the bottom of the positioning groove 27 magnetically adhere to each other, achieving bottom anti-detachment basic locking.

[0041] A first connecting plate 16 is fixed to the top of the annular plate 15, and a limiting plate 31 is attached to the side of the first connecting plate 16; a connecting seat 18 is fixed to the top of the first support frame 3, and a limiting groove 30 is opened in the connecting seat 18. The limiting plate 31 is vertically inserted into the limiting groove 30 to complete the lateral limiting. Pulling the pull block 42 causes the locking rod 41 to disengage from the locking groove 40. The locking rod 41 causes the moving block to stretch the third spring 43. At this time, the second spring 39 is in the stretched state, causing the slide plate 33 to move downward. A stop block 35 is fixed at the lower end of the top horizontal plate 34 of the skateboard 33; a stop groove 36 is opened at the top of the limiting plate 31, and the stop block 35 is inserted into the stop groove 36 under the push of the second spring 39.

[0042] The third magnet 38 at the bottom of the stop groove 36 and the fourth magnet 37 at the bottom of the stop block 35 attract each other, further reinforcing the vertical locking and preventing the limiting plate 31 from falling out of the limiting groove 30 due to equipment vibration.

[0043] (II) Working principle of dismantling circular protective net 17 Pull the horizontal plate 34 upwards. The horizontal plate 34 drives the slide plate 33 to stretch the second spring 39. At the same time, the horizontal plate 34 drives the stop block 35 upwards to disengage from the stop groove 36, releasing the fixation of the limiting plate 31. Simultaneously, the locking groove 40 aligns with the locking rod 41, and the third spring 43 resets, causing the locking rod 41 to engage in the locking groove 40, thus fixing the slide plate 33. Push the button 26 upwards, causing the push block 25 to push the reset block 23 upwards out of the positioning groove 27. Then pull the annular plate 15 to the left, separating the rectangular insertion hole 20 from the rectangular insertion plate 21. The bottom insertion structure is completely unlocked, and the annular plate 15 can be removed as a whole, simultaneously bringing out the inner circular protective net 17, completing the disassembly, cleaning, and replacement operation.

[0044] Example 2 The difference between this embodiment and Embodiment 1 is that this embodiment abandons the single low-roughness flow-guiding coating of Embodiment 1 and adopts a double-layer composite functional coating. The bottom layer is a micron-level anti-corrosion and wear-resistant epoxy coating with a thickness controlled between 0.08 and 0.12 mm, which can effectively resist long-term erosion by wind and sand and salt spray corrosion, and eliminate the problem of airflow turbulence caused by wear and roughness of the inner wall of the duct. The surface layer is a nano-hydrophobic and anti-fouling flow-guiding coating, which not only retains the core performance of low wind resistance and prevention of airflow boundary layer peeling, but also realizes automatic dust removal, anti-frost and anti-condensation. It can quickly guide water flow in rainy weather and prevent dust adhesion and accumulation in windy and sandy weather. It can continuously and stably maintain the wind speed amplification ratio corresponding to a 1:6 cross-section ratio and a 10° cone angle, and the accuracy error of 3 to 5 times speed increase is controlled within ±0.2 times under all working conditions.

[0045] The rest is the same as in Example 1.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coaxial multi-blade wind turbine with a wind-collecting duct, characterized in that, Includes a base (1), a boss (2), a coaxially arranged wind-collecting and speed-increasing duct, a coaxial transmission assembly, a multi-stage series wind-catching impeller, a sealed power generation chamber (14), and a shock-absorbing base (6); the sealed power generation chamber (14) is equipped with a generator; The wind-collecting and speed-increasing duct is a three-section integrated rotary frustum structure, coaxially covering the outside of the multi-stage series wind-catching impeller, and is divided into an air inlet diffusion section (4), a diameter reduction speed-increasing section (5), and an air outlet pressure stabilizing section. The ratio of the cross-sectional area of ​​the air inlet of the air inlet diffusion section (4) to one opening of the diameter reduction speed-increasing section (5) is 1:6, and the overall cone angle of the wind-collecting and speed-increasing duct is 10°. The coaxial transmission assembly includes a through-type load-bearing main shaft (10) and two sealed limiting bearings (9). The through-type load-bearing main shaft (10) is laid out along the central axis of the air collection speed-increasing duct. The multi-stage series wind-catching impeller includes a first-stage guide impeller (11), a second-stage main wind-catching impeller (12), and a third-stage residual pressure recovery impeller (13) arranged in sequence. The first-stage guide impeller (11), the second-stage main wind-catching impeller (12), and the third-stage residual pressure recovery impeller (13) are eccentrically connected and fixed to the outer wall of the same through-type main bearing shaft (10), forming a coaxial transmission structure. The first-stage guide impeller (11), the second-stage main wind-catching impeller (12), and the third-stage residual pressure recovery impeller (13) are circumferentially arranged with 6 to 8 sets of bidirectional curvature airfoil blades. The end of the through-type load-bearing main shaft (10) is rigidly connected to the sealed power generation compartment (14) inside the generator input end; Two first support frames (3) are fixedly installed on the top of the base (1), and the air inlet diffuser section (4) and the air outlet pressure stabilizing section are respectively located on the inner side of the two first support frames (3); two second support frames (7) are also installed on the top of the base (1), and the diameter reduction and speed increase section (5) is installed on the inner side of the two second support frames (7); Two support frames (8) are installed on the inner side of the diameter reduction and speed increase section (5), and two sealed limit bearings (9) are installed on the two support frames (8) respectively. The through-type bearing spindle (10) is installed on the inner ring of the two sealed limit bearings (9).

2. The coaxial multi-blade wind turbine with a wind-collecting duct according to claim 1, characterized in that, The inner wall of the wind-collecting and speed-increasing duct is provided with a low-roughness flow-guiding coating to reduce airflow resistance, suppress airflow boundary layer peeling, and ensure the stability of the wind speed amplification ratio.

3. A coaxial multi-blade wind turbine with a wind-collecting duct according to claim 2, characterized in that, The first-stage guide vane (11), the second-stage main wind-catching vane (12), and the third-stage residual pressure recovery vane (13) are adjacent to each other to avoid interference between the wakes of the front and rear vanes and reduce aerodynamic losses.

4. A coaxial multi-blade wind turbine with a wind-collecting duct according to claim 3, characterized in that, An annular plate (15) is installed at one end of the air inlet diffuser section (4), and a circular protective net (17) is installed on the inner side of the annular plate (15). The circular protective net (17) is designed to prevent foreign objects from entering the air collection and speed-up duct from the air inlet diffuser section (4). A first connecting plate (16) is fixedly installed on the top of the annular plate (15), and a second connecting plate (19) is fixedly installed on the bottom of the annular plate (15).

5. A coaxial multi-blade wind turbine with a wind-collecting duct according to claim 4, characterized in that, The second connecting plate (19) has a rectangular insertion hole (20) arranged horizontally, and a rectangular insertion plate (21) is fixedly installed on one side of the base (1). The rectangular insertion plate (21) is inserted into the rectangular insertion hole (20).

6. A coaxial multi-blade wind turbine with a wind-collecting duct according to claim 5, characterized in that, The bottom of the rectangular insert (21) is provided with a reset groove (22), and a reset block (23) is slidably installed in the reset groove (22). The bottom of the reset block (23) is provided with an inclined surface, and the top of the reset block (23) is fixedly installed with a first spring (24). The top of the first spring (24) is fixedly connected to the top inner wall of the reset groove (22). The bottom inner wall of the rectangular insert (20) is provided with a positioning groove (27), and the bottom of the reset block (23) is engaged with the positioning groove (27).

7. A coaxial multi-blade wind turbine with a wind-collecting duct according to claim 6, characterized in that, A vertical hole is provided on the bottom inner wall of the positioning groove (27), and a push block (25) is slidably installed in the vertical hole. The push block (25) is used to push the reset block (23) out of the positioning groove (27). A button (26) is fixedly installed on the bottom of the push block (25), and a stop block is fixedly installed on the outside of the push block (25). The bottom of the stop block contacts the bottom inner wall of the positioning groove (27). A first magnet (28) is fixedly installed on the bottom of the reset block (23), and a second magnet (29) is fixedly installed on the bottom inner wall of the positioning groove (27). The first magnet (28) and the second magnet (29) attract each other to increase the stability of the reset block (23) in the mounting.

8. A coaxial multi-blade wind turbine with a wind-collecting duct according to claim 7, characterized in that, A connecting seat (18) is fixedly installed on the top of the first support frame (3). A limiting groove (30) is provided on one side of the connecting seat (18). A limiting plate (31) is fixedly installed on one side of the first connecting plate (16). One side of the limiting plate (31) is engaged with the limiting groove (30). A stop groove (36) is provided on the top of the limiting plate (31). A third magnet (38) is fixedly installed on the bottom inner wall of the stop groove (36).

9. A coaxial multi-blade wind turbine with a wind-collecting duct according to claim 8, characterized in that, The top of the connecting seat (18) is provided with a spring groove (32), and a sliding plate (33) is slidably installed in the spring groove (32). One end of a second spring (39) is fixedly installed at the bottom of the sliding plate (33). The bottom end of the second spring (39) is fixedly connected to the bottom inner wall of the spring groove (32). A horizontal plate (34) is fixedly installed at the top of the sliding plate (33). A stop block (35) is fixedly installed at the bottom of the horizontal plate (34). The bottom of the stop block (35) is engaged with the stop groove (36). A fourth magnet (37) is fixedly installed at the bottom of the stop block (35). The third magnet (38) and the fourth magnet (37) attract each other to increase the stability of the stop block (35).

10. A coaxial multi-blade wind turbine with a wind-collecting duct according to claim 9, characterized in that, A locking groove (40) is provided on one side of the sliding plate (33), and a transverse hole is provided on the inner wall of one side of the spring groove (32). A locking rod (41) is slidably installed in the transverse hole. One end of the locking rod (41) contacts one side of the sliding plate (33), and a pull block (42) is installed on the other end of the locking rod (41). A moving groove is provided on the side wall of the transverse hole, and a moving block is slidably installed in the moving groove. The bottom of the moving block is fixedly connected to the locking rod (41). A third spring (43) is fixedly installed on one side of the moving block, and one end of the third spring (43) is fixedly connected to the inner wall of one side of the moving groove.

Images