A speed-increasing wind power generator

Abstract

The application relates to a speed-increasing wind power generator, which comprises a rotating large wind wheel with large wind blades, a power-generating small wind wheel with small wind blades, and a generator; the power-generating small wind wheel is connected to the rotating shaft of the rotating large wind wheel through a suspension mechanism, and the rotating plane of the power-generating small wind wheel is in a non-parallel relationship with the rotating plane of the rotating large wind wheel; when the rotating large wind wheel is driven to rotate by wind power, the power-generating small wind wheel is driven to revolve around the rotating shaft by the rotating shaft, and meanwhile, the power-generating small wind wheel is driven to rotate by wind power, and the rotating energy of the power-generating small wind wheel is input to the generator to generate power. The application has the characteristics of unique concept, reasonable structure, and remarkable speed increase of the power-generating small wind wheel; the power-generating small wind wheel is driven to revolve by the low-speed rotating large wind wheel, so that the power-generating small wind wheel moves at high speed in the wind, the rotating speed is increased, the generator can be directly driven, the gear box is saved, the weight is reduced, and the strength is expanded.

Description

Technical fields:

[0001] This invention belongs to the field of wind turbine generators, and specifically relates to a speed-increasing wind turbine generator. Background technology:

[0002] The core principle of wind power generation is the interaction between wind and wind turbine blades. Wind energy directly acts on the wind turbine, causing it to rotate and drive a generator to produce electricity. The output power is directly proportional to the wind turbine's frontal area and the square of the wind speed. However, wind speed is naturally generated and cannot be artificially increased. Therefore, to increase power, the wind turbine's frontal area must be increased, and the blades must be lengthened. With the increased blade length, the turbine's rotational speed is actually slower due to the limitation of the tip speed ratio. To meet the generator's power requirements at low speeds, the generator's size and weight must be increased. Large and medium-sized wind turbines use gearboxes to increase the generator's rotational speed. All of these factors increase costs and create inconveniences for transportation and installation.

[0003] The object of this invention is to provide a more reasonable technical solution to artificially increase the speed of the interaction between wind and wind turbine. Summary of the Invention:

[0004] The purpose of this invention is to design a speed-increasing wind turbine that uses a low-speed, large-blade wind turbine to synchronously drive a small-blade wind turbine to rotate at high speed.

[0005] Traditional wind turbines have only one rotor, which directly drives or drives the generator via a gearbox. The generator's rotational speed is equal to or a multiple of the rotor's rotational speed.

[0006] The wind turbine of this invention has two types of wind turbines, one large and one small. The large wind turbine drives the small wind turbine to rotate synchronously under the action of wind, and the small wind turbine accelerates to drive the generator to generate electricity. At this time, the speed of the generator is not exactly a multiple of the speed of the large wind turbine.

[0007] The technical solution of this invention is implemented as follows: a speed-increasing wind turbine generator, characterized in that: it includes a large rotating wind turbine with large blades and a small generating wind turbine with small blades, as well as a generator; the generating wind turbine is connected to the rotating shaft of the large rotating wind turbine through a suspension mechanism, and the rotation plane of the generating wind turbine is not parallel to the rotation plane of the large rotating wind turbine; when the large rotating wind turbine is driven to rotate by wind power, it drives the generating wind turbine to revolve synchronously around the rotating shaft through the rotating shaft, and at the same time, the generating wind turbine is driven to rotate on its own axis by wind power, and its rotational energy is transmitted to the generator to generate electricity.

[0008] As a preferred embodiment, the rotating large wind turbine is a horizontal axis type wind turbine, whose shaft extends in a horizontal or near-horizontal direction and is positioned on a tower; at least two radially extending support arms are fixed on the shaft, and a small power generation wind turbine is installed at the end of each support arm; the small power generation wind turbine is a horizontal axis type or a vertical axis type wind turbine, and when it is a horizontal axis type, its blades face the circumferential wind shear direction of the rotating large wind turbine.

[0009] As a preferred embodiment, the rotating large wind turbine is a horizontal axis type wind turbine, whose shaft extends in a horizontal or near-horizontal direction and is positioned on a tower; a dual-input shaft generator is directly fixed on the shaft; the two ends of the generator's input shafts extend symmetrically, and a vertical axis type generator small wind turbine is installed at the end of each input shaft; the rotation torque of the two generator small wind turbines is coupled to the rotor of the generator through the input shafts.

[0010] As a preferred embodiment, the rotating large wind turbine is a vertical axis type wind turbine, whose shaft extends vertically and is positioned on a tower; at least two radially extending support arms are fixed on the shaft, and a small power generation wind turbine is installed at the end of each support arm; the small power generation wind turbine is a horizontal axis type or a vertical axis type wind turbine, and when it is a horizontal axis type, its blades face the circumferential wind shear direction of the rotating large wind turbine.

[0011] As a preferred embodiment, the rotating large wind turbine is a vertical axis type wind turbine, whose rotating shaft extends vertically and is positioned on the tower; a dual-input shaft generator is directly fixed on the rotating shaft; the two ends of the generator's input shafts extend horizontally symmetrically, and a vertical axis type generator small wind turbine is installed at the end of each input shaft; the rotation torque of the two generator small wind turbines is coupled to the rotor of the generator through the input shafts.

[0012] This invention features a unique concept, a reasonable structure, and a significant speed increase for the small wind turbine used for power generation. By rotating a large wind turbine at low speed, the small wind turbine is driven to revolve in the wind, maintaining a good angle of attack. This increases the speed of the small wind turbine's rotation, allowing it to directly drive the generator, eliminating the need for a gearbox, reducing weight, and increasing its scalability. Attached image description:

[0013] The invention will be further described below with reference to specific figures:

[0014] Figure 1 Schematic diagram of a horizontal-axis rotating large wind turbine paired with a horizontal-axis generating small wind turbine.

[0015] Figure 2 Side view of a horizontal-axis rotating large wind turbine paired with a horizontal-axis generating small wind turbine.

[0016] Figure 3 Analysis diagram of the angle between the plane of rotation of a horizontal-axis rotating large wind turbine and a horizontal-axis generating small wind turbine.

[0017] Figure 4 Schematic diagram of a vertical axis rotating large wind turbine paired with a vertical axis generating small wind turbine.

[0018] Figure 5 Side view of a vertical-axis rotating large wind turbine paired with a vertical-axis generating small wind turbine.

[0019] Figure 6 Analysis diagram of the angle between the rotation plane of a vertical-axis rotating large wind turbine and a horizontal-axis generating small wind turbine.

[0020] in

[0021] 1—Rotating windmill; 11—Shaft;

[0022] 2—Small wind turbine for power generation;

[0023] 3—Generator; 31—Input shaft;

[0024] 4—Tower;

[0025] 5—Support arm;

[0026] A—The angle between the normal to the plane of rotation of the small wind turbine and the normal to the plane of rotation of the large wind turbine; Detailed implementation method:

[0027] This invention was inspired by the childhood game of playing with a paper windmill: when there is wind, stand facing the wind and the paper windmill will spin; the stronger the wind, the faster the paper windmill will spin. When there is no wind, run forward and the paper windmill will spin; the faster you run, the faster the paper windmill will spin.

[0028] Traditional wind turbines have a fixed rotor that doesn't move. The wind blows onto the blades, applying force to them, causing the rotor to rotate; the higher the wind speed, the faster the rotor spins.

[0029] This invention utilizes a large rotating wind turbine to drive a small rotating wind turbine to generate electricity by actively facing the wind. In other words, the position of the small rotating wind turbine is not fixed. Driven by the rotating large wind turbine, it moves in a high-speed circle. The faster the movement speed, the greater the interaction between the wind and the wind turbine blades, and the faster the small rotating wind turbine rotates.

[0030] Reference Figure 1 and Figure 2 The rotation plane of the small generator wind turbine is approximately 90 degrees to that of the large generator wind turbine; more specifically, the angle between the rotation planes of the small generator wind turbine and the large generator wind turbine is ideally within a range of 90 degrees ± 30 degrees, allowing the small generator wind turbine to also benefit from the combined effect of natural wind power. When the large generator wind turbine rotates under wind power, it drives the two small generator wind turbines at both ends to revolve synchronously around the axis via a support shaft. Simultaneously, the small generator wind turbines rotate on their own axes under wind power, driving the coaxial generator to produce electricity.

[0031] When the wind acts directly on the large wind turbine, the wind speed is generally less than 10 meters per second. The large wind turbine rotates, but the rotation speed is only tens to hundreds of revolutions per minute. This drives the connected small wind turbine support shaft to rotate synchronously. The two small wind turbines that are symmetrically installed at the end of the support shaft can rotate at a high speed of more than a thousand revolutions per minute in the side wind, thus achieving the speed-increasing effect.

[0032] The radius R of the distance between the centers of the small generator wind turbine and the large rotating wind turbine determines the speed at which the installation point of the small generator wind turbine moves in the wind. For every revolution of the large rotating wind turbine, the installation point of the small generator wind turbine also rotates once. The length of the support shaft of the small generator wind turbine is 2 x R, and the distance of the circumference displacement is the circumference of the installation point = 2 x 3.14 x R. The speed at which the installation point of the small generator wind turbine moves is directly proportional to the rotational speed of the large rotating wind turbine and the length of the support shaft of the small generator wind turbine.

[0033] If the wind speed is 9 meters per second, the rotation speed of the large wind turbine is 2 revolutions per second, and the length of the support shaft of the small wind turbine is 6 meters, meaning the center distance between the small wind turbine and the large wind turbine is 3 meters, the moving speed of the installation point of the small wind turbine is 2 x 3.14 x 6 = 37.68 meters per second. The small wind turbine moves forward at a speed of 37.68 meters per second in the crosswind (crosswind speed is not considered for now), and the wind speed increases by about 4 times. At this time, the wind speed acting on the small wind turbine is equivalent to a Category 12 typhoon.

[0034] Wind turbine structures are divided into two main categories: horizontal axis and vertical axis.

[0035] The wind turbine of this invention can be configured in four ways as needed:

[0036] 1. One large horizontal-axis rotating wind turbine and two small horizontal-axis power generating wind turbines;

[0037] 2. A large wind turbine rotating on a horizontal axis and two small wind turbines generating electricity on a vertical axis;

[0038] 3. A large wind turbine rotating on a vertical axis and two small wind turbines generating electricity on a horizontal axis;

[0039] 4. One large vertical-axis rotating wind turbine and two small vertical-axis power generating wind turbines;

[0040] In other words, a large rotating rotor of a speed-increasing wind turbine can be either a horizontal-axis rotor or a vertical-axis rotor; a small generating rotor can also be either a horizontal-axis rotor or a vertical-axis rotor, depending on the specific wind field.

[0041] Horizontal-axis generator-driven small wind turbines: Two horizontal-axis generator-driven small wind turbines require two generators. The generator shafts are directly mounted on the horizontal-axis wind turbines, and the two generators are fixed to the two ends of the support shaft, respectively. Figure 1 and Figure 2 .

[0042] Vertical axis wind turbine generator: Two vertical axis wind turbines share one generator, which is installed in the center. The two ends of the generator's shaft extend to mount the vertical axis wind turbine generators. These shaft extenders also serve as support shafts. Figure 3 and Figure 4 .

[0043] Based on the design requirements of the rotational speed, blade tip speed ratio, and wind turbine thrust of the large and small wind turbines, the number of blades of the rotating large wind turbine and the generating small wind turbine can be 1, 2, 3, or more.

[0044] The optimal solution consists of a large horizontal rotating wind turbine with two blades and two small vertical generating wind turbines, each with three blades. The two blades of the large rotating wind turbine and the support shaft of the small generating wind turbine form a cross shape. The generator is installed in the middle of the support rod, which solves the problems of centrifugal force and dynamic balance during rotation.

[0045] The following are two specific embodiments to further illustrate the specific structure of the present invention.

[0046] Example 1:

[0047] Reference Figure 1 and Figure 2 The wind turbine generator includes a large rotating wind turbine 1 with large blades, a small generating wind turbine 2 with small blades, and a generator 3. The small generating wind turbine 2 is connected to the rotating shaft 11 of the large rotating wind turbine through a suspension mechanism. The rotation plane of the small generating wind turbine 2 is not parallel to the rotation plane of the large rotating wind turbine 1. Without considering the effect of natural wind, the two planes are close to perpendicular, so that the small generating wind turbine has the best windward angle when it rotates. When the large rotating wind turbine 1 is driven to rotate by wind power, it drives the small generating wind turbine 2 to revolve around the rotating shaft 11 synchronously. At the same time, the small generating wind turbine 2 is driven to rotate by wind power or wind resistance, and its rotation energy is transmitted to the generator 3 to generate electricity.

[0048] The large rotating wind turbine 1 typically rotates slowly in the wind, requiring multiple speed stages to directly drive the generator. However, it is used to drive the small generator wind turbine 2. By utilizing the windward angle of the small generator wind turbine 2, which is close to the tangential direction of its rotation, it actively faces the wind and, under the influence of wind resistance, increases its rotation speed, achieving direct-drive power generation and reducing the weight of the transmission mechanism. The aforementioned suspension mechanism can be the support arm 5 or the generator's input shaft 31; specific combinations will be explained below.

[0049] In this illustration, the large rotating wind turbine 1 is a horizontal-axis type, with its shaft 11 extending horizontally or nearly horizontally and positioned on the tower 4. This is no different from existing small wind turbines, except that it does not directly drive the generator. At least two radially extending support arms 5 are fixed on the shaft 11, and a small wind turbine 2 for generating electricity is installed at the end of each support arm 5. The small wind turbine 2 for generating electricity is either a horizontal-axis type or a vertical-axis type. When it is a horizontal-axis type, its blades face the circumferential wind-cutting direction of the large rotating wind turbine 1, and have the maximum windward angle.

[0050] In this example, the rotating wind turbine 1 has a dual-blade structure, meaning it has a pair of symmetrically arranged support arms 5. A three-blade rotating wind turbine would have three corresponding support arms 5, also arranged in a circular array, and so on, which is the optimal distribution. Of course, it's also possible to design a structure on the extended shaft 11 that doesn't correspond to the blades of the rotating wind turbine 1, such as dual blades driving three or four support arms; however, this would result in a less aesthetically pleasing appearance. These designs can be chosen based on the natural wind force distribution. If necessary, centrifugal speed limiting mechanisms or other protective measures can be added to the rotating shaft 11 of the rotating wind turbine; these technologies are similar to existing technologies. In wind farms with strong natural winds, the rotation plane of the small wind turbine can also adopt a larger angle with the rotation plane of the large wind turbine to superimpose the natural wind force. Figure 3 The angle A between the normal of the rotating plane of the large wind turbine and the normal of the rotating plane of the small wind turbine can be between 60 and 100 degrees. The dashed arrow in the figure indicates the selectable range of the normal of the rotating plane of the small wind turbine.

[0051] Another preferred embodiment of the rotating large wind turbine 1 is a horizontal axis wind turbine: a dual-input shaft generator 3 is directly fixed on the rotating shaft 11; the two ends of the generator 3 have symmetrically extended input shafts 31, and a vertical axis type small wind turbine 2 is installed at the end of each input shaft 31; the rotational torque of the two small wind turbines 2 is coupled to the rotor of the generator 3 through the input shafts 31. Figure 3 and Figure 4 Example of generator installation. It should be noted that when the two coaxial generator rotors 2 are designed to rotate in the same direction, they can be directly locked onto the input shaft 31. If they rotate in opposite directions, they need to be coupled to the generator 3. In this design, it is best to choose a perpendicular angle between the rotation plane of the generator rotor and the rotation plane of the main rotor.

[0052] Example 2:

[0053] Reference Figure 4 and Figure 5The rotating large wind turbine 1 is a vertical axis wind turbine, with its rotating shaft 11 extending vertically and positioned on the tower 4; a dual-input shaft generator 3 is directly fixed on the rotating shaft 11; the two ends of the generator 3 have horizontally symmetrical input shafts 31, and a vertical axis generator small wind turbine 2 is installed at the end of each input shaft 31; the rotation torque of the two generator small wind turbines 2 is coupled to the rotor of the generator 3 through the input shafts 31.

[0054] Another preferred embodiment of the rotating large wind turbine 1 is a vertical axis wind turbine. At least two radially extending support arms 5 are fixed to its shaft 11, and a small power generating turbine 2 is installed at the end of each support arm 5. The small power generating turbine 2 can be a horizontal axis or vertical axis wind turbine. When it is a horizontal axis type, its blades face the circumferential wind-cutting direction of the rotating large wind turbine 1. When a horizontal axis type small power generating turbine is selected, its plane of rotation can have an angle with the plane of rotation of the rotating large wind turbine. This angle is allowed to be within ±30 degrees of 90 degrees. Figure 6 The angle A between the rotational normal of the horizontal axis type small wind turbine and the rotational plane normal of the vertical axis type large wind turbine can be selected within a range of 90 degrees ± 30 degrees, that is, within the range of the two dashed arrows in the figure.

[0055] The above provides four simple combinations to illustrate the design principle of this technology. It is applicable to all known types of wind turbines, including large rotating wind turbines and small wind turbines for power generation, and can be used in any combination. These combinations should also be protected under this application.

Claims

1. A speed-increasing wind turbine generator, characterized in that: The system includes a large rotating wind turbine (1) with large blades and a small generating wind turbine (2) with small blades, as well as a generator (3). The small generating wind turbine (2) is connected to the rotating shaft (11) of the large rotating wind turbine through a suspension mechanism, and the rotation plane of the small generating wind turbine (2) is not parallel to the rotation plane of the large rotating wind turbine (1). When the large rotating wind turbine (1) is driven to rotate by wind power, it drives the small generating wind turbine (2) to revolve around the rotating shaft (11) synchronously. At the same time, the small generating wind turbine (2) is driven to rotate by wind power, and its rotation energy is transmitted to the generator (3) to generate electricity.

2. The speed-increasing wind turbine generator according to claim 1, characterized in that: The rotating large wind turbine (1) is a horizontal axis wind turbine, and its shaft (11) extends in a horizontal or near-horizontal direction and is positioned on the tower (4); at least two radially extending support arms (5) are fixed on the shaft (11), and a small power generation wind turbine (2) is installed at the end of each support arm (5); the small power generation wind turbine (2) is a horizontal axis wind turbine or a vertical axis wind turbine, and when it is a horizontal axis wind turbine, its blades face the circumferential wind shear direction of the rotating large wind turbine (1).

3. The speed-increasing wind turbine generator according to claim 1, characterized in that: The rotating large wind turbine (1) is a horizontal shaft type wind turbine, whose shaft (11) extends in a horizontal or near-horizontal direction and is positioned on the tower (4); a dual-input shaft generator (3) is directly fixed on the shaft (11); the two ends of the generator (3) have symmetrically extended input shafts (31), and a vertical shaft type small wind turbine (2) is installed at the end of each input shaft (31); the rotation torque of the two small wind turbines (2) is coupled to the rotor of the generator (3) through the input shaft (31).

4. The speed-increasing wind turbine generator according to claim 1, characterized in that: The rotating large wind turbine (1) is a vertical axis wind turbine, and its shaft (11) extends vertically and is positioned on the tower (4); at least two radially extending support arms (5) are fixed on the shaft (11), and a small power generation wind turbine (2) is installed at the end of each support arm (5); the small power generation wind turbine (2) is a horizontal axis wind turbine or a vertical axis wind turbine. When it is a horizontal axis wind turbine, its blades face the circumferential wind shear direction of the rotating large wind turbine (1).

5. The speed-increasing wind turbine generator according to claim 1, characterized in that: The rotating large wind turbine (1) is a vertical axis wind turbine, and its rotating shaft (11) extends vertically and is positioned on the tower (4); a dual-input shaft generator (3) is directly fixed on the rotating shaft (11); the two ends of the generator (3) have horizontally symmetrical input shafts (31), and a vertical axis small wind turbine (2) is installed at the end of each input shaft (31); the rotation torque of the two small wind turbines (2) is coupled to the rotor of the generator (3) through the input shaft (31).

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