A vertical axis wind generator

Abstract

The application discloses a vertical axis wind driven generator, comprising a tower frame, a generator and a wind wheel assembly; the generator is arranged in the tower frame; the wind wheel assembly comprises straight blades, a support, a hub and a transmission shaft; the straight blades are arranged along the vertical direction and are arranged in multiple around the circumference of the tower; the straight blades are connected with the hub through the support; the hub is connected with the transmission shaft; the transmission shaft is connected with the rotating shaft of the generator through a shaft coupling. The vertical axis wind driven generator has the advantages of multi-direction wind receiving, light weight and low gravity center, reduces the rigidity requirement of the tower, and guarantees the stability of the whole system. Compared with the horizontal axis structure, the vertical axis wind driven generator has simpler design, is easier to manufacture and maintain, and can support the development of larger power wind driven generators.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and more specifically to a vertical axis wind turbine. Background Technology

[0002] Socioeconomic development and human activities are inseparable from energy supply. Vigorously developing renewable energy helps promote the country's green energy transformation, and ensuring energy supply is of great significance to people's livelihood. As a renewable energy source with great potential, wind energy has accumulated technological expertise and industrialized over the past few decades, and its share in my country's energy structure is increasing.

[0003] Currently, horizontal axis wind turbines dominate the development of the wind power industry. However, the installed capacity of a single horizontal axis wind turbine is approaching its technological limit. For example, the rotor structure, transmission chain, generator system, and control system of a horizontal axis wind turbine are all concentrated at the top of the tower, resulting in a top-heavy structure. This places high demands on the strength design of the tower support structure. Continuing to develop larger-capacity horizontal axis wind turbines would greatly increase the difficulty and cost of manufacturing, installation, and operation and maintenance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a vertical axis wind turbine that has lower requirements for structural strength design.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a vertical axis wind turbine generator, comprising a tower frame, a generator and a wind turbine assembly;

[0006] The generator is installed inside the tower frame;

[0007] The wind turbine assembly includes straight blades, a support member, a hub, and a drive shaft. The straight blades are arranged vertically and multiple blades are arranged around the circumference of the tower. The straight blades are connected to the hub through the support member. The hub is connected to the drive shaft, and the drive shaft is connected to the generator shaft through a coupling.

[0008] Straight blades and support components drive the hub and drive shaft to rotate, converting wind energy into mechanical energy. The drive shaft then drives the generator shaft to rotate, converting mechanical energy into electrical energy.

[0009] The advantages of the aforementioned vertical axis wind turbine are: the vertical axis rotor structure can receive wind from multiple directions, outputs electricity stably without a yaw mechanism, and allows the drive train, generator, and control equipment to be placed at the bottom of the unit, lowering the center of gravity. Therefore, it offers advantages such as multi-directional wind reception, light weight, and a low center of gravity, reducing the rigidity requirements on the tower while ensuring the overall system stability. Compared to horizontal axis structures, it is not only simpler to design but also easier to manufacture and maintain, and can support the development of larger power wind turbine units.

[0010] Furthermore, the support includes an upper inclined support and a lower inclined support, which are symmetrically arranged, with one end of each support connected to the wheel hub and the other end inclined upwards and downwards respectively, and connected to the straight blade.

[0011] The inclined layout of the support components shortens the length of the hub and drive shaft, making the structure lighter and improving its rigidity and load-bearing capacity, while reducing the rigidity requirements of the tower.

[0012] Furthermore, the inclined support is provided with a pneumatic braking mechanism, including an electric cylinder, a slider, a push rod and a resistance plate. The electric cylinder is fixedly installed inside the inclined support, the slider is movably installed inside the inclined support and connected to the electric cylinder, the two ends of the push rod are respectively hinged to the slider and the resistance plate, and the resistance plate is rotatably installed on the inclined support.

[0013] When the wind turbine assembly needs to be braked, the slider is moved by the electric cylinder. The slider drives the drag plate to rotate relative to the upper inclined support through the push rod. After the drag plate opens, it can increase the windward area and aerodynamic thrust, thereby reducing the wind turbine speed and achieving the braking effect.

[0014] Furthermore, the inclined support is provided with a fixed bracket and a guide rail bracket. The electric cylinder is mounted on the fixed bracket, the slider is movably mounted on the guide rail, and the guide rail is mounted on the guide rail bracket. Both the fixed bracket and the guide rail bracket are connected to the inclined support by circular steel sections.

[0015] The electric cylinder pushes the slider to move on the guide rail, which can drive the push rod to rotate, causing the resistance plate to expand or retract relative to the upper inclined support. The round steel section can improve the stability of the braking mechanism on the upper inclined support.

[0016] Furthermore, two resistance plates are symmetrically provided, and two push rods are also symmetrically provided on the slider, which are respectively hinged to the side of the two resistance plates that are close to each other.

[0017] The two drag plates increase the frontal area and aerodynamic drag.

[0018] Furthermore, the resistance plate is provided with an extension mechanism, including a slide rod, a resistance cloth and a rotating wheel. The resistance plate has a cavity inside, and slide rods that are slidably connected are inserted into both ends of both sides. Resistance cloth is provided on both sides. One end of the resistance cloth is fixedly connected to the side of the resistance plate, and the other end is fixed to the two slide rods.

[0019] The rotating wheel is rotatably disposed in the cavity. The hinge joint between the push rod and the resistance plate is located in the cavity and is connected to the rotating wheel via a pull rope. The rotating wheel is connected to a sliding sleeve, which is sleeved on the sliding rod. The inner wall of the sliding sleeve is provided with a spiral groove, and the sliding rod is provided with a slider that is slidably connected to the spiral groove.

[0020] When the push rod rotates, it drives the drag plate to rotate, which in turn drives the wheel to rotate through the pull rope. The wheel drives the sliding sleeve to rotate, and the spiral groove drives the slide rod to move axially. After the slide rod moves outward, the drag cloth is unfolded, which can further increase the windward area and aerodynamic drag.

[0021] Furthermore, the ends of the two slide rods are connected by a connecting rod, and the two ends of the connecting rod are rotatably connected to the two slide rods respectively.

[0022] When not in use, the resistance cloth can be wrapped and stored on the connecting rod. When the slide bar moves outward, the connecting rod rotates to unfold the resistance cloth.

[0023] Furthermore, the rotating wheel is rotatably connected to the cavity via a spring hinge.

[0024] Spring hinges can be used to automatically reset the slide bar after the resistance plate retracts.

[0025] Furthermore, a hydraulic brake is also provided inside the tower frame, and a brake disc is provided outside the drive shaft. The hydraulic brake is capable of clamping the brake disc.

[0026] By using a hydraulic brake to clamp the brake disc, the rotational speed of the wind turbine assembly can be reduced, thus braking the wind turbine.

[0027] Furthermore, a bushing is fixedly provided at the top of the tower frame, and a thrust bearing, an upper radial slewing support bearing, and a lower radial slewing bearing are respectively provided at the top, middle, and bottom of the bushing. The drive shaft passes through the bushing and cooperates with the thrust bearing, the upper radial slewing support bearing, and the lower radial slewing support bearing.

[0028] The thrust bearing is used to support the weight of the wind turbine assembly, while the upper radial slewing bearing and the lower radial slewing bearing are used to support the aerodynamic thrust generated by the rotation of the wind turbine assembly. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0030] Figure 1 This is a front view of a vertical axis wind turbine provided in an embodiment of the present invention;

[0031] Figure 2 for Figure 1 A schematic diagram of a pneumatic braking mechanism for a vertical axis wind turbine is shown.

[0032] Figure 3 for Figure 1A cross-sectional view of the shaft sleeve of a vertical axis wind turbine is shown.

[0033] Figure 4 A schematic diagram of an extension mechanism for a vertical axis wind turbine provided in an embodiment of the present invention;

[0034] Figure label:

[0035] 10-Tower frame, 11-Shaft sleeve, 111-Thrust bearing, 112-Upper radial slewing support bearing, 113-Lower radial slewing support bearing, 12-Hydraulic brake, 13-Brake disc;

[0036] 20 - Generator;

[0037] 30-Wind turbine assembly, 31-Straight blade, 32-Support component, 321-Upper inclined support, 322-Lower inclined support, 33-Hub, 34-Drive shaft;

[0038] 40-Pneumatic braking mechanism, 41-Fixed bracket, 42-Guide rail bracket, 421-Guide rail, 43-Electric cylinder, 431-Connecting frame, 44-Slider, 45-Push rod, 46-Resistance plate, 47-Circular steel section;

[0039] 50-Extension mechanism, 51-Slide rod, 52-Resistance cloth, 53-Roller, 54-Pull rope, 55-Sliding sleeve, 56-Connecting rod. Detailed Implementation

[0040] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0041] Please see Figures 1 to 3 The present invention provides a vertical axis wind turbine generator, including a tower frame 10, a generator 20 and a wind turbine assembly 30, wherein the wind turbine assembly 30 drives the generator 20 to generate electricity.

[0042] Specifically, the tower frame 10 is fixedly connected to the foundation via a bolted connection structure. The upper layer is used to install the wind turbine assembly 30 and the generator 20, while the lower layer is used to house the control cabinet and batteries. The wind turbine assembly 30 is located at the top of the tower frame 10 and includes straight blades 31, a support member 32, a hub 33, and a drive shaft 34. The straight blades 31 are arranged vertically and multiple are arranged around the circumference of the tower; in this embodiment, there are three. The straight blades 31 are connected to the hub 33 via the support member 32. The hub 33 and the drive shaft 34 are connected by a spline fit and bolted connection. The drive shaft 34 is connected to the shaft of the generator 20 via a coupling.

[0043] Under the influence of wind, the straight blades 31 and the support 32 drive the hub 33 and the drive shaft 34 to rotate, converting wind energy into mechanical energy. The drive shaft 34 then drives the generator 20's shaft to rotate, converting mechanical energy into electrical energy. The vertical axis wind turbine structure has the advantage of multi-directional wind reception, and each piece of equipment can be placed at the bottom, offering advantages such as light weight and a low center of gravity. This reduces the rigidity requirements of the tower while ensuring the stability of the overall system.

[0044] Specifically, the support member 32 includes an upper inclined support 321 and a lower inclined support 322, which are symmetrically arranged. One end of each support is connected to the hub 33, and the other ends are inclined upwards and downwards respectively, connecting to the straight blade 31 to form a truss structure. A skin is laid on the outer side for aerodynamic design to reduce aerodynamic drag. (For illustration purposes,...) Figure 1 The diagram shows the concealed skin of one of the support components. The inclined layout of support component 32 can shorten the length of the hub and drive shaft, making the structure lighter, and can also improve the structural rigidity and load-bearing capacity, while reducing the rigidity requirements of the tower.

[0045] Specifically, the inclined support 321 is equipped with a pneumatic braking mechanism 40, including an electric cylinder 43, a slider 44, a push rod 45, and a resistance plate 46. The inclined support 321 contains a fixed bracket 41 and a guide rail bracket 42. The electric cylinder 43 is fixedly mounted on the fixed bracket 41, and the guide rail 421 is fixedly mounted on the guide rail bracket 42. The slider 44 is movably mounted on the guide rail 421. The electric cylinder 43 is connected to the slider 44 via a connecting frame 431, enabling it to drive the slider 44 to reciprocate on the guide rail 421. The push rod 45 is hinged at both ends to the slider 44 and the resistance plate 46, respectively. The resistance plate 46 is rotatably mounted on the inclined support 321. Furthermore, both the fixed bracket 41 and the guide rail bracket 42 are connected to the inclined support via circular steel sections 47, which improves the overall stability.

[0046] When the wind turbine assembly 30 needs braking, the electric cylinder 43 pushes the slider 44 to move on the guide rail 421. The slider 44 drives the drag plate 46 to rotate relative to the upper inclined support 321 via the push rod 45. After the drag plate 46 opens, it can increase the windward area and aerodynamic thrust, thereby reducing the wind turbine speed and achieving a braking effect. In this embodiment, two drag plates 46 are symmetrically provided, and two push rods 45 are also symmetrically provided on the slider 44, which are respectively hinged to the side of the two drag plates 46 that are close to each other. The two drag plates 46 can increase the windward area and aerodynamic drag.

[0047] Specifically, a hydraulic brake 12 is installed inside the tower frame 10, and a brake disc 13 is installed outside the drive shaft 34. The hydraulic brake 12 can clamp the brake disc 13. By clamping the brake disc 13 with the hydraulic brake 12, the rotational speed of the wind turbine assembly can be reduced, thus braking the wind turbine. When the wind speed exceeds the rated wind speed, the opening angle of the drag plate can be adjusted to change the windward area and aerodynamic drag, which, together with the hydraulic braking system, stabilizes the unit's rotational speed and output power.

[0048] A shaft sleeve 11 is bolted to the top of the tower frame 10. A thrust bearing 111, an upper radial slewing bearing 112, and a lower radial slewing bearing 113 are respectively installed at the top, middle, and bottom of the shaft sleeve 11. The drive shaft 34 passes through the shaft sleeve 11 and engages with the thrust bearing 111, the upper radial slewing bearing 112, and the lower radial slewing bearing 113. The thrust bearing 111 bears the weight of the wind turbine assembly 30, while the upper and lower radial slewing bearings 113 bear the aerodynamic thrust generated by the rotation of the wind turbine assembly 30.

[0049] To improve braking performance, such as Figure 4 (A top view of the resistance plate 46) shows that, in another embodiment, the resistance plate 46 is provided with an extension mechanism 50. This includes a slide rod 51, a resistance cloth 52, and a rotating wheel 53. The resistance plate 46 has an internal cavity, and slide rods 51 are slidably connected to both ends on both sides. Resistance cloths 52 are also provided on both sides. One end of the resistance cloth 52 is fixedly connected to the side wall of the resistance plate 46, and the other end is fixed to the two slide rods 51. The rotating wheel 53 is rotatably disposed within the cavity. The portion of the push rod 45 that is hinged to the resistance plate 46 is located within the cavity and is connected to the rotating wheel 53 via a pull rope 54. The rotating wheel 53 is connected to a sliding sleeve 55. One end of the slide rod 51 located within the cavity is slidably inserted into the sliding sleeve 55, and a spiral groove is formed on the inner wall of the sliding sleeve 55. A slider 2 slidably connected to the spiral groove is provided on the slide rod 51.

[0050] When the push rod 45 rotates and drives the resistance plate 46 to rotate, the hinge can drive the wheel 53 to rotate together through the pull rope 54, thereby driving the sliding sleeve 55 to rotate. With the cooperation of the spiral groove and the slide rod 51, the slide rod 51 moves outward along the axis, thereby unfolding the resistance cloth 52, further increasing the windward area and aerodynamic drag.

[0051] The ends of the two slide rods 51 are connected by a connecting rod 56, and both ends of the connecting rod 56 are rotatably connected to the two slide rods 51 respectively. When not in use, the resistance cloth 52 is wrapped and stored on the connecting rod 56. When the slide rods 51 move outward, the connecting rod 56 rotates to unfold the resistance cloth 52. In addition, the rotating wheel is rotatably connected to the cavity through a spring hinge, which can be used for the automatic reset of the slide rods after the resistance plate is retracted.

[0052] The working principle of the above-mentioned vertical axis wind turbine is as follows: the straight blades 31 and the support 32 drive the hub 33 and the drive shaft 34 to rotate, converting wind energy into mechanical energy. The drive shaft 34 drives the shaft of the generator 20 to rotate, converting mechanical energy into electrical energy. When the wind turbine assembly needs to be braked, the electric cylinder 43 pushes the slider 44 to move on the guide rail 421. The slider 44 drives the drag plate 46 to rotate relative to the upper inclined support 321 through the push rod 45. After the drag plate 46 opens, it can increase the windward area and aerodynamic thrust, thereby reducing the wind turbine speed. At the same time, the hydraulic brake 12 clamps the brake disc 13, which together with the pneumatic braking mechanism 40 achieves the braking effect.

[0053] The vertical axis wind turbine described above offers advantages such as multi-directional wind reception, light weight, and a low center of gravity, reducing the rigidity requirements of the tower while ensuring the overall system stability. Compared to horizontal axis structures, it is not only simpler to design but also easier to manufacture and maintain, enabling the development of larger power wind turbine units. Furthermore, the combination of pneumatic and hydraulic braking provides better braking performance, stabilizing the unit's speed and power output.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A vertical axis wind generator characterised in that: Includes the tower frame, generator, and wind turbine assembly; The generator is installed inside the tower frame; The wind turbine assembly includes straight blades, a support member, a hub, and a drive shaft. The straight blades are arranged vertically and multiple blades are arranged around the circumference of the tower. The straight blades are connected to the hub through the support member. The hub is connected to the drive shaft, and the drive shaft is connected to the generator shaft through a coupling. The support includes an upper inclined support and a lower inclined support, which are symmetrically arranged. One end of each support is connected to the hub, and the other end is inclined upwards and downwards respectively, and connected to the straight blade. The inclined support is equipped with a pneumatic braking mechanism, including an electric cylinder, a slider, a push rod and a resistance plate. The electric cylinder is fixedly installed inside the inclined support. The slider is movably installed inside the inclined support and connected to the electric cylinder. The two ends of the push rod are respectively hinged to the slider and the resistance plate. The resistance plate is rotatably installed on the inclined support. The resistance plate is provided with an extension mechanism, including a slide rod, a resistance cloth and a rotating wheel. The resistance plate has a cavity inside, and slide rods that are slidably connected are inserted into both ends of both sides. Resistance cloth is provided on both sides. One end of the resistance cloth is fixedly connected to the side of the resistance plate, and the other end is fixed to the two slide rods. The rotating wheel is rotatably disposed in the cavity. The hinge joint between the push rod and the resistance plate is located in the cavity and is connected to the rotating wheel via a pull rope. The rotating wheel is connected to a sliding sleeve, which is sleeved on the sliding rod. The inner wall of the sliding sleeve is provided with a spiral groove, and the sliding rod is provided with a slider that is slidably connected to the spiral groove.

2. A vertical axis wind generator as claimed in claim 1, characterised in that: The inclined support is equipped with a fixed bracket and a guide rail bracket. The electric cylinder is mounted on the fixed bracket, the slider is movably mounted on the guide rail, and the guide rail is mounted on the guide rail bracket. Both the fixed bracket and the guide rail bracket are connected to the inclined support via circular steel sections.

3. A vertical axis wind generator as claimed in claim 2, characterised in that: Two resistance plates are symmetrically arranged, and two push rods are also symmetrically arranged on the slider, which are respectively hinged to the side of the two resistance plates that are close to each other.

4. A vertical axis wind generator as claimed in claim 1, characterised in that: The ends of the two slide rods are connected by a connecting rod, and the two ends of the connecting rod are rotatably connected to the two slide rods respectively.

5. A vertical axis wind generator as claimed in claim 1, characterised in that: The rotating wheel is rotatably connected to the cavity via a spring hinge.

6. A vertical axis wind generator as claimed in claim 1, characterised in that: The tower frame is also equipped with a hydraulic brake, and a brake disc is provided outside the drive shaft. The hydraulic brake is capable of clamping the brake disc.

7. A vertical axis wind generator as claimed in claim 1, characterised in that: A bushing is fixedly installed at the top of the tower frame. A thrust bearing, an upper radial slewing support bearing, and a lower radial slewing bearing are respectively installed at the top, middle, and bottom of the bushing. The drive shaft passes through the bushing and cooperates with the thrust bearing, the upper radial slewing support bearing, and the lower radial slewing support bearing.

Images