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

Abstract

The invention 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] The invention relates to the field of large vertical axis wind turbines, in particular to an axial gravity balancing device for a vertical axis wind turbine and a vertical axis wind turbine. Background Art

[0002] Compared with traditional horizontal axis wind turbines, the impeller and main shaft of vertical axis wind turbines are arranged vertically, and there is no need to adjust the angle facing the wind direction. It can better adapt to the changing wind direction. This enables vertical axis wind turbines to operate stably in complex urban environments, offshore and near-shore environments, and some special environments, improving the utilization efficiency of wind energy resources. However, large vertical axis wind turbines have not been widely used.

[0003] At present, the main reason that affects the large-scale development of vertical axis wind turbines is that the vertical axis bearing of the vertical axis wind turbine bears too much gravity, which shortens the life of the bearing. The short service life of the bearing makes it inconvenient to replace, and the replacement also increases the cost. For example, Chinese Patent 202010141881.4 discloses a dual-wind-rotor vertical axis wind power generation device, which includes an inner wind rotor assembly, an outer wind rotor assembly, a tower support assembly and a generator assembly. The inner wind rotor assembly and the outer wind rotor assembly are arranged on the tower support assembly through bearings. After the device is large-scaled, the above-mentioned problems exist, and the greater the bearing gravity of the vertical axis bearing, the greater the friction of the bearing, which makes the power generated by the wind turbine in a breeze almost offset by the friction of the bearing, which increases the starting wind speed of the vertical axis wind turbine and makes it difficult to carry out breeze power generation of the vertical axis wind turbine. Summary of the invention

[0004] The object of the present invention is to provide an axial gravity balancing device for a vertical axis wind turbine and a vertical axis wind turbine. The balancing device makes the resultant force of the axial bearing force of the wind rotor shaft close to zero, and the friction of the bearing becomes smaller, which can increase the life of the bearing and enable the vertical axis wind turbine to generate breeze power.

[0005] The technical solution of the present invention:

[0006] A vertical axis wind turbine axial gravity balancing device, an outer wind rotor shaft balancing device and a liquid storage tank; the outer wind rotor shaft balancing device comprises an outer wind rotor shaft bracket and an outer wind rotor shaft buoy box, the outer wind rotor shaft bracket is fixedly connected to the outer wind rotor shaft, and the outer wind rotor shaft buoy box is fixedly connected to the outer wind rotor shaft bracket via an external supporting column; the liquid storage tank is filled with liquid, and the lower part of the outer wind rotor shaft buoy box is placed in the liquid in the liquid storage tank.

[0007] It also includes an inner wind wheel shaft balancing device, which includes an inner wind wheel shaft bracket and an inner wind wheel shaft buoy box. The inner wind wheel shaft bracket is fixedly connected to the inner wind wheel shaft. The inner wind wheel shaft buoy box is fixedly connected to the inner wind wheel shaft bracket through an inner supporting column. The lower part of the inner wind wheel shaft buoy box is placed in the liquid in the liquid tank.

[0008] Beneficial effects of the present invention:

[0009] 1. The axial gravity balance device of the vertical axis wind turbine of the present application is installed on the inner wind rotor shaft and the outer wind rotor shaft, so that the inner wind rotor shaft and the inner wind sail bracket assembly installed on the outer wind rotor shaft and the outer wind sail bracket assembly installed on the wind rotor shaft and the outer wind sail bracket assembly installed on the wind rotor shaft and the outer wind sail bracket assembly installed on the wind rotor shaft and the outer wind sail bracket assembly installed on the wind rotor shaft and the outer wind sail bracket assembly installed on the wind rotor shaft and the outer wind sail bracket assembly installed on the wind rotor shaft and the outer wind rotor shaft and the outer wind sail bracket assembly installed on the wind rotor shaft and the outer wind rotor shaft and the outer wind rotor shaft and the inner wind rotor shaft and the outer ... BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[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 of the dual-rotor vertical-axis wind turbine of the present application.

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

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

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

[0016] Reference numerals:

[0017] 1-Inner wind rotor shaft; 2-Outer wind rotor shaft; 3-Liquid storage tank; 4-Liquid storage tank pillar; 5-Tower support beam; 6-Inner wind rotor shaft power output gear; 7-Outer wind rotor shaft lower end bearing; 8-Outer wind rotor shaft power output gear; 9-Tower column; 10-Inner wind rotor shaft support bearing; 11-Tower foundation chassis; 12-Inner wind rotor shaft support ring beam; 13-Inner wind rotor shaft oblique support rod; 14-Inner support column; 15-Inner wind rotor shaft buoy box; 16-Inner wind rotor shaft horizontal support rod; 17-Inner wind Axle support reinforcement rod; 18-outer wind rotor shaft support ring beam; 19-outer wind rotor shaft frame oblique support rod; 20-outer support column; 21-outer wind rotor shaft buoy box; 22-outer wind rotor shaft transverse support rod; 23-outer wind rotor shaft support reinforcement rod; 24-inner wall of liquid storage tank; 25-outer wall of liquid storage tank; 26-liquid storage tank partition board; 27-inner liquid storage tank; 28-outer liquid storage tank; 30-inner wind rotor shaft bracket; 31-outer wind rotor shaft bracket; 32-inner sail bracket assembly; 33-outer sail bracket assembly. DETAILED DESCRIPTION

[0018] In order to solve the problems in the background technology, the present invention has invented an axial gravity balance device for a vertical axis wind turbine. To be precise, the device uses the buoyancy of liquid to suspend the components rotating together on the inner rotor shaft and the components rotating together on the outer rotor shaft of the wind turbine, respectively, to maintain the buoyancy and the gravity balance of the shaft and the components on the shaft, so that the resultant force of the bearing force of the rotor shaft in the axial direction is close to zero. The resultant force of the axial force borne by the bearing is close to zero, and the friction of the bearing becomes smaller, which can increase the life of the bearing and enable the vertical axis wind turbine to generate electricity in the breeze section.

[0019] It should be noted that, in the description of the present application, terms such as "inside", "outside", "upper", and "lower" indicating directions or positional relationships are based on the directions or positional relationships shown in the 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, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The vertical axis wind turbine axial gravity balancing device of the present application includes single rotor shaft, double rotor shaft and multiple rotor shaft, and is suitable for single rotor vertical axis wind turbine, double rotor vertical axis wind turbine and multiple rotor vertical axis wind turbine.

[0022] The following describes an axial gravity balancing device for a single-rotor vertical-axis wind turbine, an axial gravity balancing device for a double-rotor vertical-axis wind turbine, a single-rotor vertical-axis wind turbine, and a double-rotor vertical-axis wind turbine in conjunction with the accompanying drawings.

[0023] A single-rotor vertical axis wind turbine comprises a supporting tower, an outer wind rotor assembly and a generator set assembly, wherein the supporting tower comprises a tower foundation chassis, a tower column and a tower support crossbeam, wherein the tower foundation chassis is fixedly connected to the lower end of the tower column, the upper part of the tower column is fixedly connected to the tower support crossbeam, and the outer wind rotor assembly is mounted on the tower column; the outer wind rotor assembly comprises an outer wind rotor shaft, an outer sail bracket assembly, a lower end bearing of the outer wind rotor shaft, and a power output gear of the outer wind rotor shaft, wherein the outer wind rotor shaft The upper part is equipped with an outer sail bracket assembly, the lower end of the outer wind rotor shaft is equipped with an outer wind rotor shaft power output gear and an outer wind rotor shaft lower end bearing, the outer wind rotor shaft lower end bearing is fixedly connected to the tower foundation chassis, the outer wind rotor shaft is equipped with an outer wind rotor shaft power output gear, and the outer wind rotor shaft power output gear is connected to the generator assembly; the outer wind rotor shaft is equipped with the single wind rotor vertical axis wind turbine axial gravity balance device described below; the lower end of the liquid tank is fixedly connected to the tower foundation chassis through the liquid tank support. The structure of the outer sail bracket assembly on the upper part of the outer wind rotor assembly of this application and the connection method with the upper part of the tower column are the same as the outer wind rotor assembly part of the patent No. 202010141881.4, named as a double wind rotor vertical axis wind power generation device patent.

[0024] An axial gravity balancing device for a single-rotor vertical-axis wind turbine comprises an outer wind rotor shaft balancing device and a liquid storage tank; the outer wind rotor shaft balancing device comprises an outer wind rotor shaft bracket and an outer wind rotor shaft buoy box, the outer wind rotor shaft bracket is fixedly connected to the outer wind rotor shaft, and the outer wind rotor shaft buoy box is fixedly connected to the outer wind rotor shaft bracket via an external supporting pillar; the liquid storage tank is filled with liquid, and the lower part of the outer wind rotor shaft buoy box is placed in the liquid in the liquid storage tank.

[0025] A dual-rotor vertical axis wind turbine includes a supporting tower, an inner wind rotor assembly, an outer wind rotor assembly and a generator assembly. The supporting 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. The upper part of the tower column 9 is fixedly connected to the tower support beam 5. The inner wind rotor assembly and the outer wind rotor assembly are mounted on the tower column. The structure of the inner sail bracket assembly 32 on the upper part of the inner wind rotor assembly and the outer sail bracket assembly 33 on the upper part of the outer wind rotor assembly and the connection method with the upper part of the tower column 9 are the same as patent number 202010141881.4, and the name is a patent for a dual-rotor vertical axis wind power generation device. The inner wind rotor assembly includes an inner wind rotor shaft 1, an inner sail bracket assembly, an inner wind rotor shaft support bearing 10, and an inner wind rotor shaft power output gear 6. The inner wind rotor shaft 1 is provided with an inner sail bracket assembly 32 at the upper end. The inner wind rotor shaft 1 is connected to the tower support beam 5 through the inner wind rotor shaft support bearing 10. The inner wind rotor shaft 1 is provided with an inner wind rotor shaft power output gear 6, and the inner wind rotor shaft power output gear 6 is connected to the generator set assembly. The outer wind rotor assembly includes an outer wind rotor shaft 2, an outer wind sail bracket assembly 33, an outer wind rotor shaft lower end bearing 7, and an outer wind rotor shaft power output gear 8. The outer wind sail bracket assembly is installed at the upper end of the outer wind rotor shaft 2, and the outer wind rotor shaft power output gear 5 and the outer wind rotor shaft lower end bearing 4 are installed at the lower end of the outer wind rotor shaft 2. The outer ring of the outer wind rotor shaft lower end bearing 4 is fixedly connected to the tower foundation chassis 11. The outer wind rotor shaft 2 is equipped with an outer wind rotor shaft power output gear 8, and the outer wind rotor shaft power output gear 8 is connected to the generator assembly. The inner wind rotor shaft 1 and the outer wind rotor shaft 2 are equipped with the axial gravity balance device of the double wind rotor vertical axis wind turbine described below. The lower end of the liquid storage tank is fixedly connected to the tower foundation chassis through the liquid storage tank support 4. The inner wind rotor assembly, outer wind rotor assembly, generator assembly, inner sail bracket assembly and outer sail bracket assembly structure of the double wind rotor vertical axis wind turbine in the present application refer to 202010141881.4. The outer wind rotor shaft and the inner wind rotor shaft rotate independently in opposite directions along the axial direction, and the inner wind rotor shaft buoy box and the outer wind rotor shaft buoy box also rotate in opposite directions along the axial direction driven by the inner wind rotor shaft and the outer wind rotor.

[0026] An axial gravity balancing device for a double-rotor vertical axis wind turbine includes an inner rotor shaft balancing device, an outer rotor shaft balancing device and a liquid storage tank 3. The inner rotor shaft balancing device includes an inner rotor shaft bracket 30 and an inner rotor shaft buoy box 15. The inner rotor shaft bracket 30 is arranged on the inner rotor shaft buoy box 15. The inner rotor shaft bracket 30 is fixedly connected to the inner rotor shaft 1. The inner rotor shaft buoy box 15 is fixedly connected to the inner rotor shaft bracket 30 through an inner support pillar 14. The inner rotor bracket connects the inner rotor shaft buoy box to the inner rotor shaft. The outer rotor shaft balancing device includes an outer rotor shaft bracket 31 and an outer rotor shaft buoy box 21. The outer rotor shaft bracket 31 is arranged on the outer rotor shaft buoy box 21. The outer rotor shaft bracket is fixedly connected to the outer rotor shaft. The outer rotor shaft bracket is fixedly connected to the outer rotor shaft through an outer support pillar. The outer wind wheel bracket connects the outer wind wheel shaft buoy box to the outer wind wheel shaft. The liquid tank is filled with liquid, and the lower parts of the inner wind wheel shaft buoy box 15 and the outer wind wheel shaft buoy box 21 are placed in the liquid in the liquid tank 3. The liquid in the liquid tank 3 plays a role in lifting the inner wind wheel shaft buoy box and the outer wind wheel shaft buoy box upward.

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

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

[0029] The liquid storage tank 3 is a circular annular groove with an upper opening, and the liquid storage tank 3 is provided with a liquid storage tank inner wall 24 and a liquid storage tank outer wall 25, and a liquid storage tank partition plate 26 is provided between the liquid storage tank inner wall 24 and the liquid storage tank outer wall 25, and the liquid storage tank partition plate divides the space between the liquid storage tank inner wall and the liquid storage tank outer wall into an inner liquid storage tank 24 and an outer liquid storage tank 28, and the inner liquid storage tank and the outer liquid storage tank are filled with liquid, and the lower end of the inner wind wheel shaft buoy box is placed in the inner liquid storage tank, and the lower end of the outer wind wheel shaft buoy box is placed in the outer liquid storage tank. When it is an axial gravity balance device for a single wind wheel vertical axis wind turbine, there is no partition plate inside the liquid storage tank, and there is only one liquid storage tank.

[0030] The density of the liquid contained in the liquid tank 3 is preferably greater than or equal to 1g / cm 3, the buoyancy is greater, and antifreeze is added to prevent the liquid from freezing. A non-volatile liquid with a lower density than the liquid is placed on the top of the liquid in the liquid storage tank to form a liquid seal. The inner surface of the liquid storage tank is attached with a hydrophobic material, and the outer surfaces of the inner wind wheel shaft buoy box and the outer wind wheel shaft buoy box are attached with a hydrophobic material to reduce the friction between the inner wind wheel shaft buoy box, the outer wind wheel shaft buoy box and the liquid. A liquid storage tank can be provided in the lower part of the liquid storage tank, and a liquid guide pipe and a two-way pressure pump are provided between the liquid storage tank and the liquid storage tank to adjust the height of the liquid level in the liquid storage tank.

[0031] The cavities of the inner wind rotor shaft buoy box and the outer wind rotor shaft buoy box are filled with dense and watertight lightweight foam plastic to ensure safe operation. Counterweights are added to the outer wind rotor shaft bracket and the inner wind rotor shaft bracket to increase the moment of inertia and make the wind turbine run smoothly.

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

[0033] An inner bracket cover is added on the inner wind rotor shaft bracket, the lower end of the inner bracket cover is connected to the inner wind rotor shaft buoy box, the upper part is sleeved on the inner wind rotor shaft and covers the inner wind rotor shaft bracket. An outer bracket cover is added on the outer wind rotor shaft bracket, the lower end of the outer bracket cover is connected to the outer wind rotor shaft buoy box, the upper part is sleeved on the outer wind rotor shaft and covers the outer wind rotor shaft bracket.

[0034] The inner wind rotor shaft buoy box of the axial gravity balance device of the present application is fixed to the inner wind rotor shaft through the inner wind rotor shaft bracket, and the outer wind rotor shaft buoy box is fixed to the outer wind rotor shaft through the outer wind rotor shaft bracket. The inner wind rotor shaft is fixedly connected to the inner wind rotor shaft power output gear above the inner wind rotor shaft bracket, and the lower end of the outer wind rotor shaft is connected to the lower end bearing of the outer wind rotor shaft, and the outer ring of the bearing is fixed to the tower foundation chassis. The outer wind rotor shaft power output gear is arranged above the lower end bearing of the outer wind rotor shaft. The inner wind rotor shaft buoy box is located between the outer wall of the liquid storage tank and the liquid storage tank partition; the outer wind rotor shaft buoy is located between the liquid storage tank partition and the inner wall of the liquid storage tank. The bottom of the liquid storage tank is fixedly connected to the upper end of the liquid storage tank support, and the lower end of the liquid storage tank support is fixed to the tower foundation chassis. The inner surface of the liquid storage tank and the outer surface of the inner and outer wind rotor buoy box should be attached with hydrophobic materials to reduce the friction between the buoy box and the liquid. A liquid storage tank is partially provided below the liquid storage tank, and a liquid guide pipe and a two-way pressure pump are provided between the liquid storage tank and the liquid storage tank to adjust the height of the liquid level in the liquid storage tank. A non-volatile liquid with a density lower than that of the liquid is placed above the liquid in the liquid storage tank to form a liquid seal to prevent the evaporation of water. The metal parts in contact with the liquid in the liquid storage tank must be treated with anti-corrosion. The cavity of the inner and outer wind wheel buoy boxes is filled with dense and impermeable lightweight foam plastic to ensure the safe operation of the buoy. Counterweights are added to the outer wind wheel shaft bracket and the inner wind wheel shaft bracket to increase the moment of inertia so that the wind turbine runs smoothly, and at the same time prevent the wind turbine from being "top-heavy" as a whole. The inner support column penetrates the inner wind wheel shaft buoy box and is fixedly connected to the bottom plate of its box to enhance the strength of the overall structure. The outer support column penetrates the outer wind wheel shaft buoy box and is fixedly connected to the bottom plate of its box to enhance the strength of the overall structure.

[0035] The present invention provides an axial gravity balancing device for a double-rotor vertical axis wind turbine. Specifically, the device utilizes the buoyancy of liquid to suspend the inner rotor shaft and the outer rotor shaft of the wind turbine respectively, maintains the buoyancy and the gravity of the shaft and the accessories on the shaft in balance, and makes the resultant force of the bearings of the inner rotor shaft and the outer rotor shaft (the bearings here refer to the bearings at the lower end of the outer rotor shaft and the supporting bearings of the inner rotor shaft, and the bearings at the upper part of the tower column and the connecting part of the inner rotor assembly and the outer rotor assembly) in the axial direction close to zero. Since the resultant force of the axial force borne by the bearings is close to zero, the friction of the bearings becomes smaller, which can increase the service life of the bearings and enable the vertical axis double-rotor wind turbine to generate breeze power. This is also equivalent to adding the entire weight of the fan blades and the rotating shaft of the double-rotor vertical axis wind turbine to the liquid in the liquid tank through the inner and outer rotor shaft buoy boxes, which is similar to putting a heavy object on a boat and then suspending it in the liquid, which can reduce the strength of the main bearing of the vertical axis of the wind turbine and reduce the manufacturing cost of the wind turbine. At the same time, the rotating part of the entire twin-rotor vertical axis wind turbine rotates on the liquid like a ship. Even the friction of the huge rotating part of the wind turbine is very small, mainly to overcome the friction between the float and the liquid. The friction between the solid and the liquid is very small, because the inner and outer wind rotor shaft float box is a ring-shaped whole, and its rotation does not have the resistance of breaking through the water like a ship, but only overcomes the friction between the float and the liquid. Therefore, even if the rotating part of the wind turbine weighs hundreds of tons, it becomes very easy to rotate, which opens the door to the gigantism of the twin-rotor vertical axis wind turbine; in order to reduce the volume of the float and reduce the friction between the float and the liquid, you can choose to use a density greater than 1g / cm 3 The higher the density of the liquid, the greater the buoyancy of the same volume of liquid. The greater the buoyancy, the smaller the volume of the float required to float the same weight. Because the inner and outer wind wheels of the twin-rotor vertical axis wind turbine rotate in opposite directions along the axis, the outer wind wheel shaft buoy and the inner wind wheel shaft buoy also rotate in opposite directions along the axis driven by the outer wind wheel shaft and the inner wind wheel shaft.

[0036] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and does not deviate from the technical solution of the present invention, and designs a structure and implementation similar to the technical solution based on the above implementation examples without creativity according to the technical essence of the present invention, they should all 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: It includes an external wind wheel shaft balancing device and a liquid storage tank. The external wind wheel shaft balancing device includes an external wind wheel shaft bracket and an external wind wheel shaft buoy box. The external wind wheel shaft bracket is fixedly connected to the external wind wheel shaft. The external wind wheel shaft buoy box is fixedly connected to the external wind wheel shaft bracket through an external supporting column. The liquid storage tank is filled with liquid, and the lower part of the external wind wheel shaft buoy box is placed in the liquid in the liquid storage tank.

2. A vertical axis wind turbine axial gravity balancing device, characterized in that: It also includes an inner wind wheel shaft balancing device, which includes an inner wind wheel shaft bracket and an inner wind wheel shaft buoy box. The inner wind wheel shaft bracket is fixedly connected to the inner wind wheel shaft. The inner wind wheel shaft buoy box is fixedly connected to the inner wind wheel shaft bracket through an inner supporting column. The lower part of the inner wind wheel shaft buoy box is placed in the liquid in the liquid tank.

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

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

5. The axial gravity balancing device for a vertical axis wind turbine according to claim 2, characterized in that: The liquid storage tank is a circular ring tank with an opening at the upper end. The liquid storage tank is provided with an inner liquid storage tank wall and an outer liquid storage tank wall. A liquid storage tank partition is provided between the inner liquid storage tank wall and the outer liquid storage tank wall. The liquid storage tank partition divides the space between the inner liquid storage tank wall and the outer liquid storage tank wall into an inner liquid storage tank and an outer liquid storage tank. The inner liquid storage tank and the outer liquid storage tank are filled with liquid, and the lower ends of the inner wind wheel shaft buoy box and the outer wind wheel shaft buoy box are respectively placed in the inner liquid storage tank and the outer liquid storage 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 storage tank is adhered with a hydrophobic material, and the outer surfaces of the inner wind wheel shaft buoy box and the outer wind wheel shaft buoy box are adhered with a hydrophobic 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 wind rotor shaft buoy box and the outer wind rotor shaft buoy box are filled with dense and watertight lightweight foam plastic, and counterweights are added to the outer wind rotor shaft bracket and the inner wind rotor shaft bracket to increase the moment of inertia and ensure the smooth operation of the wind turbine.

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 rotor shaft buoy box and fixedly connected to the bottom plate of the inner wind rotor shaft buoy box; the outer support column is inserted into the outer wind rotor shaft buoy box and fixedly connected to the bottom plate of the outer wind rotor shaft buoy box.

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

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

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