Axial gravity balancing device of vertical axis wind turbine and vertical axis wind turbine

Abstract

The utility model relates to an axial gravity balancing device of a vertical axis wind turbine and the vertical axis wind turbine. Comprising an inner-outer wind wheel shaft balancing device and a liquid containing groove. The inner and outer wind wheel shaft balancing device comprises an inner and outer wind wheel shaft support and an inner and outer wind wheel shaft buoy box body, the inner and outer wind wheel shaft support is fixedly connected with the inner and outer wind wheel shaft, and the inner and outer wind wheel shaft buoy box body is fixedly connected with the inner and outer wind wheel shaft support through inner and outer supporting stand columns. Liquid is contained in the liquid containing groove, and the lower portion of the inner and outer wind wheel shaft buoy box body is arranged in the liquid in the liquid containing groove. The buoyancy force of the liquid in the liquid containing groove, the gravity balance of the inner and outer wind wheel shafts and the inner and outer sail bracket assemblies which are installed on the wind wheel shafts and rotate together and the like are kept, and the resultant force of the bearing force of the bearing on the inner wind wheel shaft and the bearing on the outer wind wheel shaft in the axial direction is close to zero. The resultant force of the axial force borne by the bearing is close to zero, the friction force of the bearing is reduced, and the service life of the bearing can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of large vertical axis wind turbines, specifically to an axial gravity balancing device for a vertical axis wind turbine and a vertical axis wind turbine. Background Technology

[0002] Compared to traditional horizontal-axis wind turbines, vertical-axis wind turbines have their rotors and main shafts arranged vertically, eliminating the need to adjust their angle to face the wind direction. This allows them to better adapt to diverse wind conditions. This enables vertical-axis wind turbines to operate stably in complex urban environments, offshore and nearshore environments, and other special environments, improving the efficiency of wind energy utilization. However, large-scale vertical-axis wind turbines have not yet been widely adopted.

[0003] Currently, the main reason preventing vertical axis wind turbines from being scaled up is the excessive weight load on the vertical axis bearings, which shortens their lifespan. Shortened bearing lifespan leads to inconvenient and costly replacements. For example, Chinese Patent 202010141881.4 discloses a dual-rotor vertical axis wind power generation device, comprising an inner rotor assembly, an outer rotor assembly, a tower support assembly, and a generator assembly. The inner and outer rotor assemblies are mounted on the tower support assembly via bearings. Scaling up this device perpetuates the aforementioned problems. Furthermore, the greater the weight load on the vertical axis bearings, the greater the friction. This means that the power generated by the wind turbine in light winds is almost entirely offset by the bearing friction, increasing the starting wind speed and making it difficult to generate electricity in light winds. Utility Model Content

[0004] The purpose of this invention is to provide an axial gravity balancing device for a vertical axis wind turbine and a vertical axis wind turbine. This balancing device makes the resultant force of the bearing on the wind turbine shaft in the axial direction close to zero, and reduces the friction of the bearing. This can increase the bearing life and enable the vertical axis wind turbine to generate electricity in a light breeze.

[0005] The technical solution of this utility model:

[0006] An axial gravity balancing device for a vertical axis wind turbine includes an outer wind turbine shaft balancing device and a liquid-containing tank. The outer wind turbine shaft balancing device comprises an outer wind turbine shaft support and an outer wind turbine shaft float housing. The outer wind turbine shaft support is fixedly connected to the outer wind turbine shaft, and the outer wind turbine shaft support is fixedly connected to the outer wind turbine shaft float housing via an external support column. The liquid-containing tank contains liquid, and the lower part of the outer wind turbine shaft float housing is placed in the liquid in the liquid-containing tank.

[0007] It also includes an internal impeller shaft balancing device, which includes an internal impeller shaft support and an internal impeller shaft float box. The internal impeller shaft support is fixedly connected to the internal impeller shaft. The internal impeller shaft support is fixedly connected to the top of the internal impeller shaft float box through an internal support column. The lower part of the internal impeller shaft float box is placed in the liquid in the liquid holding tank.

[0008] The beneficial effects of this utility model are:

[0009] 1. The axial gravity balancing device for the vertical axis wind turbine of this application is installed on the inner and outer wind turbine shafts, so that the inner sail support assembly and other components rotating together on the inner and outer wind turbine shafts are suspended in the inner liquid tank, and the outer sail support assembly and other components rotating together on the outer wind turbine shaft are suspended in the outer liquid tank. This maintains the balance between the buoyancy of the liquid in the tanks and the gravity of the inner and outer wind turbine shafts and their rotating components, making the resultant force of the bearings on the inner and outer wind turbine shafts close to zero in the axial direction. With the resultant force of the bearings bearing axial forces close to zero, the bearing friction decreases, which can extend the bearing life and enable the vertical axis dual-rotor wind turbine to generate electricity even in low-wind conditions, resulting in high wind energy utilization. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0011] Figure 1 This is the front view of the dual-rotor vertical axis wind turbine of this application.

[0012] Figure 2 This is an enlarged structural schematic diagram of the axial gravity balancing device for the dual-rotor vertical axis wind turbine of this application.

[0013] Figure 3 This is an enlarged structural schematic diagram of the inner rotor shaft balancing device of the axial gravity balancing device for the dual-rotor vertical axis wind turbine of this application.

[0014] Figure 4 This is an enlarged structural schematic diagram of the outer wind turbine shaft balancing device of the axial gravity balancing device for the dual-rotor vertical axis wind turbine of this application.

[0015] Figure 5 This is an enlarged structural diagram of the liquid tank and liquid tank support column of the axial gravity balancing device for the dual-rotor vertical axis wind turbine of this application.

[0016] Figure label:

[0017] 1-Inner wind turbine shaft; 2-Outer wind turbine shaft; 3-Liquid tank; 4-Liquid tank support column; 5-Tower support beam; 6-Inner wind turbine shaft power output gear; 7-Lower bearing of outer wind turbine shaft; 8-Outer wind turbine shaft power output gear; 9-Tower column; 10-Inner wind turbine shaft support bearing; 11-Tower foundation chassis; 12-Inner wind turbine shaft support ring beam; 13-Inner wind turbine shaft diagonal support rod; 14-Inner support column; 15-Inner wind turbine shaft float box; 16-Inner wind turbine shaft horizontal support rod; 17-Inner wind turbine shaft support beam. 18-Outer wind turbine axle support reinforcing rod; 19-Outer wind turbine axle support ring beam; 20-Outer wind turbine axle frame diagonal support rod; 21-Outer support column; 22-Outer wind turbine axle float box; 23-Outer wind turbine axle horizontal support rod; 24-Outer wind turbine axle support reinforcing rod; 25-Liquid tank inner wall; 26-Liquid tank outer wall; 27-Liquid tank partition plate; 28-Inner liquid tank; 30-Outer liquid tank; 31-Outer wind turbine axle bracket; 32-Inner sail bracket assembly; 33-Outer sail bracket assembly. Detailed Implementation

[0018] To address the problems in the background technology, this application presents an axial gravity balancing device for a vertical axis wind turbine. Specifically, this device utilizes the buoyancy of a liquid to suspend the rotating components on the inner and outer rotor shafts of the wind turbine, maintaining a balance between the buoyancy and the gravity of the shaft and its components. This ensures that the resultant force of the bearings on the rotor shaft in the axial direction is close to zero. With the resultant force of the bearings in the axial direction close to zero, the friction of the bearings decreases, which can extend the bearing life and enable the vertical axis wind turbine to generate electricity even in low-wind conditions.

[0019] It should be noted that in the description of this application, terms such as "inner", "outer", "upper", and "lower" that indicate direction or positional relationship are based on the direction or positional relationship shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] The axial gravity balancing device for vertical axis wind turbines in this application includes single-rotor-shaft, dual-rotor-shaft, and multi-rotor-shaft configurations, and is applicable to single-rotor vertical axis wind turbines, dual-rotor vertical axis wind turbines, and multi-rotor vertical axis wind turbines.

[0022] The following description, with reference to the accompanying drawings, describes the axial gravity balancing devices for single-rotor vertical axis wind turbines, dual-rotor vertical axis wind turbines, single-rotor vertical axis wind turbines, and dual-rotor vertical axis wind turbines.

[0023] A single-rotor vertical axis wind turbine includes a support tower, an outer wind turbine assembly, and a generator assembly. The support tower includes a tower foundation chassis, a tower column, and a tower support beam. The tower foundation chassis is fixedly connected to the lower end of the tower column, and the tower support beam is fixedly connected to the upper part of the tower column. The outer wind turbine assembly is mounted on the tower column. The outer wind turbine assembly includes an outer wind turbine shaft, an outer sail support assembly, a lower bearing of the outer wind turbine shaft, and a power output gear for the outer wind turbine shaft. The upper part is equipped with an outer sail bracket assembly. The lower end of the outer wind turbine shaft is equipped with an outer wind turbine shaft power output gear and an outer wind turbine shaft lower end bearing. The outer wind turbine shaft lower end bearing is fixedly connected to the tower foundation chassis. The outer wind turbine shaft is equipped with an outer wind turbine shaft power output gear, which is connected to the generator assembly. The outer wind turbine shaft is equipped with the axial gravity balancing device for a single-rotor vertical axis wind turbine, as described below. The lower end of the liquid-collecting tank is fixedly connected to the tower foundation chassis via a liquid-collecting tank support column. The structure of the outer sail bracket assembly on the upper part of the outer wind turbine assembly in this application and its connection method with the upper part of the tower column are the same as the outer wind turbine assembly part of patent number 202010141881.4, entitled "A Double-Rotator Vertical Axis Wind Power Generation Device Patent".

[0024] An axial gravity balancing device for a single-rotor vertical axis wind turbine includes an outer rotor shaft balancing device and a liquid-containing tank. The outer rotor shaft balancing device includes an outer rotor shaft support and an outer rotor shaft float housing. The outer rotor shaft support is fixedly connected to the outer rotor shaft, and the outer rotor shaft support is fixedly connected to the outer rotor shaft float housing via an external support column. The liquid-containing tank contains liquid, and the lower part of the outer rotor shaft float housing is placed in the liquid in the liquid-containing tank.

[0025] A dual-rotor vertical axis wind turbine includes a support tower, an inner rotor assembly, an outer rotor assembly, and a generator assembly. The support tower includes a tower foundation chassis 11, a tower column 9, and a tower support beam 5. The tower foundation chassis 11 is fixedly connected to the lower end of the tower column 9, and the tower support beam 5 is fixedly connected to the upper part of the tower column 9. The inner rotor assembly and the outer rotor assembly are mounted on the tower column. The structure of the inner sail bracket assembly 32 on the upper part of the inner rotor assembly and the outer sail bracket assembly 33 on the upper part of the outer rotor assembly, as well as their connection method with the upper part of the tower column 9, are the same as those in patent number 202010141881.4, entitled "A Dual-Rotor Vertical Axis Wind Power Generation Device". The inner wind turbine assembly includes an inner wind turbine shaft 1, an inner sail bracket assembly, an inner wind turbine shaft support bearing 10, and an inner wind turbine shaft power output gear 6. The inner wind turbine shaft 1 is equipped with an inner sail bracket assembly 32 at its upper end. The inner wind turbine shaft 1 is connected to the tower support beam 5 through the inner wind turbine shaft support bearing 10. The inner wind turbine shaft power output gear 6 is mounted on the inner wind turbine shaft 1 and is connected to the generator set assembly. The outer wind turbine assembly includes an outer wind turbine shaft 2, an outer sail support assembly 33, an outer wind turbine shaft lower end bearing 7, and an outer wind turbine shaft power output gear 8. The outer sail support assembly is mounted on the upper end of the outer wind turbine shaft 2, and the outer wind turbine shaft power output gear 5 and the outer wind turbine shaft lower end bearing 4 are mounted on the lower end of the outer wind turbine shaft 2. The outer ring of the outer wind turbine shaft lower end bearing 4 is fixedly connected to the tower foundation chassis 11. The outer wind turbine shaft 2 is equipped with the outer wind turbine shaft power output gear 8, which is connected to the generator assembly. The inner wind turbine shaft 1 and the outer wind turbine shaft 2 are equipped with the axial gravity balancing device for the dual-rotor vertical axis wind turbine described below. The lower end of the liquid collection tank is fixedly connected to the tower foundation chassis via a liquid collection tank support 4. The structures of the inner and outer wind turbine assemblies, generator assembly, inner sail support assembly, and outer sail support assembly in this application of a dual-rotor vertical axis wind turbine are referenced from document 202010141881.4. The outer and inner wind turbine shafts rotate independently in opposite directions along the axial direction. The inner and outer wind turbine shaft float boxes also rotate in opposite directions along the axial direction under the influence of the inner and outer wind turbine shafts.

[0026] An axial gravity balancing device for a dual-rotor vertical axis wind turbine includes an inner rotor shaft balancing device, an outer rotor shaft balancing device, and a liquid-holding tank 3. The inner rotor shaft balancing device includes an inner rotor shaft support 30 and an inner rotor shaft float housing 15. The inner rotor shaft support 30 is mounted on the inner rotor shaft float housing 15 and is fixedly connected to the inner rotor shaft 1. The inner rotor shaft support 30 is fixedly connected to the inner rotor shaft float housing 15 via an inner support column 14. The inner rotor support connects the inner rotor shaft float housing to the inner rotor shaft. The outer rotor shaft balancing device includes an outer rotor shaft support 31 and an outer rotor shaft float housing 21. The outer rotor shaft support 31 is mounted on the outer rotor shaft float housing 21 and is fixedly connected to the outer rotor shaft. The outer rotor shaft support is fixedly connected to the outer rotor shaft float housing via an outer support column. The outer wind turbine support connects the outer wind turbine shaft float box to the outer wind turbine shaft. The liquid tank is filled with liquid, and the lower parts of the inner wind turbine shaft float box 15 and the outer wind turbine shaft float box 21 are placed in the liquid in the liquid tank 3. The liquid in the liquid tank 3 has an upward floating effect on the inner wind turbine shaft float box and the outer wind turbine shaft float box.

[0027] The inner impeller shaft bracket 30 includes an inner impeller shaft support ring beam 12, an inner impeller shaft diagonal support rod 13, an inner impeller shaft transverse support rod 16, and an inner impeller shaft support reinforcing rod 17. The inner impeller shaft support ring beam 12 is fixedly connected to the inner impeller shaft through the inner impeller shaft diagonal support rod 13 and the inner impeller shaft transverse support rod 16. The inner impeller shaft support reinforcing rod 17 is installed between the inner impeller shaft diagonal support rod and the inner impeller shaft.

[0028] The outer wind turbine shaft bracket 31 includes an outer wind turbine shaft support ring beam 18, an outer wind turbine shaft diagonal support rod 19, an outer wind turbine shaft transverse support rod 22, and an outer wind turbine shaft support reinforcing rod 23. The outer wind turbine shaft support ring beam is fixedly connected to the outer wind turbine shaft through the outer wind turbine shaft diagonal support rod and the outer wind turbine shaft transverse support rod. An outer wind turbine shaft support reinforcing rod is installed between the outer wind turbine shaft diagonal support rod and the outer wind turbine shaft.

[0029] The liquid-holding tank 3 is a circular annular groove with an open top. The liquid-holding tank 3 has an inner wall 24 and an outer wall 25. A partition plate 26 is provided between the inner wall 24 and the outer wall 25, dividing the space between them into an inner liquid-holding tank 24 and an outer liquid-holding tank 28. Both the inner and outer liquid-holding tanks are filled with liquid. The lower end of the inner wind turbine shaft float box is placed inside the inner liquid-holding tank, and the lower end of the outer wind turbine shaft float box is placed inside the outer liquid-holding tank. When it is a single-rotor vertical axis wind turbine axial gravity balancing device, there is no partition plate inside the liquid-holding tank, and there is only one liquid-holding tank.

[0030] The density of the liquid contained in the liquid tank 3 is preferably greater than or equal to 1 g / cm³. 3The system provides greater buoyancy and incorporates antifreeze to prevent liquid freezing. A non-volatile liquid with a lower density is placed on top of the liquid in the holding tank to form a liquid seal. The inner surface of the holding tank is coated with a hydrophobic material, as are the outer surfaces of the inner and outer impeller shaft float boxes, reducing friction between the float boxes and the liquid. A storage tank may be partially installed below the holding tank. A liquid guide pipe and a bidirectional pressure pump are installed between the storage tank and the holding tank to adjust the liquid level in the holding tank.

[0031] The cavities of the inner and outer wind turbine shaft float boxes are filled with dense, waterproof, lightweight foam plastic to ensure safe operation. Counterweights are added to the outer and inner wind turbine shaft supports to increase rotational inertia and ensure stable wind turbine operation.

[0032] The inner support column is inserted into the inner wind turbine shaft float box and fixedly connected to the bottom plate of the inner wind turbine shaft float box; the outer support column is inserted into the outer wind turbine shaft float box and fixedly connected to the bottom plate of the outer wind turbine shaft float box.

[0033] An inner support cover is added to the inner wind turbine shaft support. The lower end of the inner support cover is connected to the inner wind turbine shaft float box, and the upper part is fitted onto the inner wind turbine shaft and covers the inner wind turbine shaft support. An outer support cover is added to the outer wind turbine shaft support. The lower end of the outer support cover is connected to the outer wind turbine shaft float box, and the upper part is fitted onto the outer wind turbine shaft and covers the outer wind turbine shaft support.

[0034] The inner impeller shaft float housing of the axial gravity balancing device of this application is fixed to the inner impeller shaft via an inner impeller shaft bracket, and the outer impeller shaft float housing is fixed to the outer impeller shaft via an outer impeller shaft bracket. An inner impeller shaft power output gear is fixed above the inner impeller shaft bracket, and the lower end of the outer impeller shaft is connected to a lower bearing, the outer ring of which is fixed to the tower foundation chassis. An outer impeller shaft power output gear is located above the lower bearing. The inner impeller shaft float housing is located between the outer wall of the liquid-containing tank and the liquid-containing tank partition plate; the outer impeller shaft float is located between the liquid-containing tank partition plate and the inner wall of the liquid-containing tank. The bottom of the liquid-containing tank is fixed to the upper end of a liquid-containing tank support column, and the lower end of the liquid-containing tank support column is fixed to the tower foundation chassis. A hydrophobic material is applied to the inner surface of the liquid-containing tank and the outer surfaces of the inner and outer impeller float housings to reduce the friction between the float housings and the liquid. A storage tank is partially installed below the liquid-containing tank. A liquid guide pipe and a two-way pressure pump are installed between the storage tank and the liquid-containing tank to adjust the liquid level in the liquid-containing tank. A non-volatile liquid with a lower density than the liquid is placed on top of the liquid in the liquid-containing tank to form a liquid seal and prevent water evaporation. Metal parts in contact with the liquid in the liquid-containing tank must be treated with anti-corrosion measures. The cavities of the inner and outer wind turbine float boxes are filled with dense, waterproof, lightweight foam plastic to ensure the safe operation of the floats. Counterweights are added to the outer and inner wind turbine shaft supports to increase the moment of inertia, making the wind turbine run smoothly and preventing the wind turbine from being "top-heavy". The inner support column penetrates the inner wind turbine shaft float box and is fixed to its bottom plate to enhance the overall structural strength. The outer support column penetrates the outer wind turbine shaft float box and is fixed to its bottom plate to enhance the overall structural strength.

[0035] This invention provides an axial gravity balancing device for a dual-rotor vertical-axis wind turbine. More precisely, it utilizes the buoyancy of a liquid to suspend the inner and outer rotor shafts of the wind turbine, maintaining a balance between the buoyancy and the weight of the shafts and their attachments. This ensures that the combined axial load on the bearings of the inner and outer rotor shafts (referring to the lower bearing of the outer rotor shaft, the support bearing of the inner rotor shaft, and the bearing at the connection point between the upper part of the tower column and the inner and outer rotor assemblies) is close to zero. Because the combined axial force on the bearings is close to zero, the friction of the bearings decreases, which can extend the bearing life and enable the vertical-axis dual-rotor wind turbine to generate electricity in light winds. This is equivalent to placing the entire weight of the wind turbine blades and rotating shaft of the dual-rotor vertical-axis wind turbine on the liquid in the tank through the inner and outer rotor shaft float boxes, similar to placing a heavy object on a boat and suspending it in the liquid. This reduces the strength of the main bearing of the vertical shaft of the wind turbine and lowers the manufacturing cost of the wind turbine. Meanwhile, the entire rotating part of the dual-rotor vertical axis wind turbine rotates on the liquid like a boat. Even the friction of the huge rotating part of the wind turbine is very small. It mainly overcomes the friction between the floats and the liquid. This friction between the solid and the liquid is very small because the inner and outer turbine shaft float boxes are a ring-shaped whole. Its rotation does not involve the resistance of water like a boat; it only overcomes the friction between the floats and the liquid. Therefore, even if the rotating part of the wind turbine weighs hundreds of tons, it rotates very easily. This opens the door to the gigantic design of dual-rotor vertical axis wind turbines. To reduce the volume of the floats and the friction between the floats and the liquid, materials with a density greater than 1 g / cm³ can be selected. 3 High-density liquids, and the higher the density, the better. The higher the density of the liquid, the greater the buoyancy generated for the same volume. The greater the buoyancy, the smaller the volume of the float required to float the same weight. Because the inner and outer rotors of a dual-rotor vertical axis wind turbine rotate in opposite directions along the axial direction, the outer rotor shaft float and the inner rotor shaft float also rotate in opposite directions along the axial direction under the drive of the outer and inner rotor shafts.

[0036] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art, inspired by this description, design similar structures and implementations to the above embodiments without departing from the technical essence of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An axial gravity balancing device for a vertical axis wind turbine, characterized in that: The device includes an external wind turbine shaft balancing device and a liquid holding tank. The external wind turbine shaft balancing device includes an external wind turbine shaft support and an external wind turbine shaft float box. The external wind turbine shaft support is fixedly connected to the external wind turbine shaft. The external wind turbine shaft support is fixedly connected to the external wind turbine shaft float box via an external support column. The liquid holding tank is filled with liquid, and the lower part of the external wind turbine shaft float box is placed in the liquid in the liquid holding tank.

2. An axial gravity balancing device for a vertical axis wind turbine, characterized in that: It also includes an internal impeller shaft balancing device, which includes an internal impeller shaft support and an internal impeller shaft float box. The internal impeller shaft support is fixedly connected to the internal impeller shaft. The internal impeller shaft support is fixedly connected to the top of the internal impeller shaft float box through an internal support column. The lower part of the internal impeller shaft float box is placed in the liquid in the liquid holding tank.

3. The axial gravity balancing device for a vertical axis wind turbine according to claim 2, characterized in that: The inner wind turbine shaft support includes an inner wind turbine shaft support ring beam, an inner wind turbine shaft diagonal support rod, an inner wind turbine shaft transverse support rod, and an inner wind turbine shaft support reinforcing rod. The inner wind turbine shaft support ring beam is fixedly connected to the inner wind turbine shaft through the inner wind turbine shaft diagonal support rod and the inner wind turbine shaft transverse support rod. An inner wind turbine shaft support reinforcing rod is installed between the inner wind turbine shaft diagonal support rod and the inner wind turbine shaft.

4. An axial gravity balancing device for a vertical axis wind turbine according to claim 1 or 2, characterized in that: The outer wind turbine shaft support includes an outer wind turbine shaft support ring beam, an outer wind turbine shaft diagonal support rod, an outer wind turbine shaft transverse support rod, and an outer wind turbine shaft support reinforcing rod. The outer wind turbine shaft support ring beam is fixedly connected to the outer wind turbine shaft through the outer wind turbine shaft diagonal support rod and the outer wind turbine shaft transverse support rod. An outer wind turbine shaft support reinforcing rod is installed between the outer wind turbine shaft diagonal support rod and the outer wind turbine shaft.

5. The axial gravity balancing device for a vertical axis wind turbine according to claim 2, characterized in that: The liquid-holding tank is an annular groove with an open top. The liquid-holding tank has an inner wall and an outer wall. A partition plate is provided between the inner wall and the outer wall to divide the space between the inner wall and the outer wall into an inner liquid-holding tank and an outer liquid-holding tank. The inner liquid-holding tank and the outer liquid-holding tank are filled with liquid. The lower ends of the inner wind turbine shaft float box and the outer wind turbine shaft float box are respectively placed in the inner liquid-holding tank and the outer liquid-holding tank.

6. The axial gravity balancing device for a vertical axis wind turbine according to claim 5, characterized in that: The inner surface of the liquid-holding tank is covered with a water-repellent material, and the outer surfaces of the inner and outer wind turbine shaft float boxes are covered with a water-repellent material.

7. The axial gravity balancing device for a vertical axis wind turbine according to claim 2, characterized in that: The cavities of the inner and outer wind turbine shaft float boxes are filled with dense, waterproof, lightweight foam plastic. Counterweights are added to the outer and inner wind turbine shaft supports to increase the moment of inertia and make the wind turbine run smoothly.

8. The axial gravity balancing device for a vertical axis wind turbine according to claim 2, characterized in that: The inner support column is inserted into the inner wind turbine shaft float box and fixedly connected to the bottom plate of the inner wind turbine shaft float box; the outer support column is inserted into the outer wind turbine shaft float box and fixedly connected to the bottom plate of the outer wind turbine shaft float box.

9. A vertical axis wind turbine, comprising a support tower, an external wind turbine assembly, and a generator assembly, characterized in that: The supporting tower includes a tower foundation chassis, a tower column and a tower support beam. The tower foundation chassis is fixedly connected to the lower end of the tower column, and the tower support beam is fixedly connected to the upper part of the tower column. The inner and outer wind turbine assemblies are mounted on the tower column. The outer wind turbine assembly includes an outer wind turbine shaft, an outer sail support assembly, a lower bearing of the outer wind turbine shaft, and a power output gear of the outer wind turbine shaft. The outer sail support assembly is mounted on the upper end of the outer wind turbine shaft, and the power output gear and the lower bearing of the outer wind turbine shaft are mounted on the lower end of the outer wind turbine shaft. The lower bearing of the outer wind turbine shaft is fixedly connected to the tower foundation chassis. The power output gear of the outer wind turbine shaft is mounted on the outer wind turbine shaft and is connected to the generator assembly. The outer wind turbine shaft is equipped with an axial gravity balancing device for a vertical axis wind turbine as described in claim 1 or 4. The lower end of the liquid tank is fixedly connected to the tower foundation chassis through a liquid tank support column.

10. A vertical axis wind turbine, comprising a support tower, an inner rotor assembly, an outer rotor assembly, and a generator assembly, characterized in that: The supporting tower includes a tower foundation chassis, a tower column and a tower support beam. The tower foundation chassis is fixedly connected to the lower end of the tower column, and the tower support beam is fixedly connected to the upper part of the tower column. The inner wind turbine assembly and the outer wind turbine assembly are mounted on the tower column. The inner wind turbine assembly includes an inner wind turbine shaft, an inner sail bracket assembly, an inner wind turbine shaft support bearing, and an inner wind turbine shaft power output gear. The inner sail bracket assembly is mounted on the upper end of the inner wind turbine shaft. The inner wind turbine shaft is connected to the tower support beam through the inner wind turbine shaft support bearing. The inner wind turbine shaft power output gear is mounted on the inner wind turbine shaft and is connected to the generator set assembly. The outer wind turbine assembly includes an outer wind turbine shaft, an outer sail support assembly, a lower bearing of the outer wind turbine shaft, and a power output gear of the outer wind turbine shaft. The outer sail support assembly is mounted on the upper end of the outer wind turbine shaft, and the power output gear and the lower bearing of the outer wind turbine shaft are mounted on the lower end of the outer wind turbine shaft. The lower bearing of the outer wind turbine shaft is fixedly connected to the tower foundation chassis. The power output gear of the outer wind turbine shaft is mounted on the outer wind turbine shaft and is connected to the generator assembly. The axial gravity balancing device of a vertical axis wind turbine as described in any one of claims 2-8 is mounted on the inner and outer wind turbine shafts. The lower end of the liquid tank is fixedly connected to the tower foundation chassis through a liquid tank support column.

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