Vertical shaft impeller deflection rotation corrector and vertical shaft wind turbine generator

Abstract

The invention discloses a vertical shaft impeller deflection rotation corrector. The device comprises a correction cavity, an eccentric body and a correction medium. A cavity is arranged in the correction cavity and is composed of two end covers and a cylinder wall. The faces, facing the cavity, of the two end covers are the first end cover inner surface and the second end cover inner surface respectively. The eccentric body is arranged in the cavity and at least comprises three faces, and the two faces are the first eccentric body end face and the second eccentric body end face respectively. The end face of the first eccentric body and the end face of the second eccentric body freely move in any direction on the inner surface of the first end cover and the inner surface of the second end cover through direct surface contact or rolling bodies. In the cavity, the space on the periphery of the eccentric body is filled with correction media. The corrector is simple in structure, and deflection rotation correction is achieved through a pure mechanical structure and acting force such as gravity and centrifugal force. And the influence of deflection rotation of the impeller is sensitive, and corresponding correction can be provided in time. And the medium with good fluidity and low cost is adopted, so that the corrector is fast enough in response.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a vertical axis impeller skew rotation corrector and a vertical axis wind turbine set. Background Art

[0002] A vertical axis wind turbine is a wind turbine whose rotor axis is perpendicular to the horizontal plane. Vertical axis wind turbines have a long history, and the earliest vertical axis wind turbines can be traced back to the 7th century BC. Due to the problems of wind capture efficiency and self-starting of the rotor, most of the megawatt-class wind turbines currently used in commercial applications are horizontal axis. However, vertical axis wind turbines are favored by small, medium or micro distributed wind power projects because they do not require yaw, are not affected by changes in wind direction, and have low rotor rotation noise.

[0003] In vertical axis wind turbines, the axial force on the impeller shaft does not change significantly with the operating state of the wind turbine like in horizontal axis wind turbines, because the axial force is mainly caused by gravity. The radial force on the vertical axis impeller is much more complicated than the axial force. The radial force is mainly caused by thrust, the magnitude of which changes with the change of wind speed, and the direction of which also changes with the change of wind direction. That is to say, the thrust at different azimuths of 360 degrees in the circumference exists at any time, and the magnitude and direction may change significantly. During operation, under the action of radial force, the actual rotation axis of the impeller is not perpendicular to the horizontal plane, but deviates, and the higher the height, the greater the deviation. Therefore, the conventional vertical axis impeller actually rotates obliquely. Being in an oblique rotation state for a long time will accelerate the fatigue damage of the relevant components of the unit (such as the shaft and bearings), and reduce the service life of the unit.

[0004] All vertical shafts have the above-mentioned skew rotation problem, the difference lies in the degree of deflection. For example, the main shaft of a certain vertical shaft has a large radial dimension (that is, a large cross-sectional area) and strong rigidity, which makes the deflection smaller, but the phenomenon of skew rotation still exists. In addition, a conventional vertical shaft will be equipped with a fixed shaft, and bearings are set at the upper and lower ends of the fixed shaft to support the rotation of the impeller of the vertical shaft through the bearings. This setting may also alleviate the problem of skew rotation to a certain extent, but it does not solve this technical problem well. When the power of the vertical shaft unit increases, the blade length increases, and the axial length of the impeller increases, the severity of the skew rotation problem will gradually become prominent. Longer blades usually mean more weight, and the unbalanced mass of the impeller after eccentricity will cause more obvious additional bending moments and other problems.

[0005] To solve or better alleviate the problem of impeller skew rotation, the following factors need to be considered: 1) There are two solutions to the above problem: a) fundamentally prevent the occurrence of skew rotation. Obviously, this method requires more cost, such as making the spindle cross-section larger to make it have greater rigidity; b) when the skew rotation phenomenon occurs, use a compensation (or correction) device to reduce the skew rotation amplitude to an acceptable level.

[0006] 2) If a device is used to suppress the problem of skew rotation, it should be able to provide a reaction force large enough to resist the radial force causing the skew, even while taking into account the influence of centrifugal force.

[0007] 3) This device should avoid using electrically driven equipment, such as motors, as much as possible. The introduction of motors means a more complex system (such as lines, sensors, and slip rings), higher costs, and lower reliability.

[0008] 4) If this device relies solely on a mechanical structure (such as a spring mechanism) to provide a reaction force to suppress the negative impact of the deflection rotation, then the mechanical structure needs to have a fast enough response speed, because small and medium-sized vertical axis impellers rotate at a high speed (tens of revolutions per minute, or even hundreds of revolutions per minute). Too slow a response speed may cause the reaction force provided by the mechanical structure to not only fail to suppress or alleviate the deflection phenomenon, but to aggravate the deflection and cause a counter-effect.

[0009] 5) The device needs to be simple enough in structure and composition. First, it has cost advantages over the method of "directly strengthening the shaft". Second, it can be maintenance-free during low-maintenance settings and easy to process and install. Finally, the device's interface versatility needs to be compatible with various vertical axis units. Summary of the invention

[0010] In order to solve at least one of the above-mentioned technical problems, a first aspect provides a vertical axis impeller skew rotation corrector, characterized in that it includes a correction chamber, an eccentric body and a correction medium.

[0011] The correction cavity is hollow inside to form a cavity. The cavity is composed of two end covers and a cylinder wall arranged between the two end covers. The surfaces of the end covers facing the cavity are the inner surface of the first end cover and the inner surface of the second end cover.

[0012] The eccentric body is arranged in the cavity. The eccentric body is a structure including at least three faces, two of which are eccentric body end faces. The two eccentric body end faces are respectively a first eccentric body end face and a second eccentric body end face.

[0013] The first eccentric body end surface and the second eccentric body end surface are free to move in any direction on the first end cover inner surface and the second end cover inner surface through direct surface contact or rolling bodies respectively.

[0014] The correction medium is liquid or semi-solid or discrete solid particles. In the cavity, the space outside the eccentric body is filled with the correction medium.

[0015] In a further technical solution, the surface of the cylinder wall facing the cavity is a continuous curved surface.

[0016] The inner surface of the first end cover and the inner surface of the second end cover are both planes or both spherical surfaces; when the inner surface of the first end cover and the inner surface of the second end cover are both spherical surfaces, the inner surface of the first end cover is a concave spherical surface, and the inner surface of the second end cover is a convex spherical surface.

[0017] The inner surface of the first end cover and the inner surface of the second end cover are parallel to each other.

[0018] The surface of the eccentric body located between the two end surfaces of the eccentric body is a continuous curved surface.

[0019] The eccentric body is a sealed hollow shell structure, or a sealed hollow shell structure with reinforcing ribs or reinforcing rods arranged inside.

[0020] The end cover or the cylinder wall of the correction chamber is provided with a supplementary hole for adding correction medium.

[0021] In a second aspect, a vertical axis wind turbine is provided, comprising the vertical axis impeller skew rotation corrector. The vertical axis wind turbine also comprises an impeller, and the impeller comprises blades, a connecting rod and a rotating shaft.

[0022] In a further technical solution, the vertical axis impeller skew rotation corrector is arranged at the top end of the rotating shaft, and the end cover of the vertical axis impeller skew rotation corrector including the inner surface of the second end cover is connected to the top end of the rotating shaft.

[0023] The geometric centers of the inner surface of the first end cover and the inner surface of the second end cover in the vertical axis impeller skew rotation corrector are both on the rotation axis of the impeller.

[0024] The beneficial effects of the present invention are as follows: through a device composed of a purely mechanical structure, gravity, centrifugal force and other forces are used to form a skew rotation correction. The corrector has a simple structure, a clear structure and a clear division of labor. It is sensitive to the impact caused by the skew rotation of the impeller and can provide corresponding corrections in a timely manner. The corrector uses a medium with good fluidity, easy to obtain and low cost to generate a force that suppresses the skew rotation, so that the corrector responds quickly enough. At the same time, the windward area of ​​the entire corrector itself is small enough, the negative impact on the impeller's wind capture efficiency is low and no obvious additional burden is imposed on the support system. The entire device is easy to process and install, and is compatible with a variety of vertical axis wind turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the skewed rotation of a conventional vertical-axis impeller according to an embodiment of the present invention; Figure 2 A cross-sectional view of a correction chamber of a vertical-axis impeller skew rotation corrector according to an embodiment of the present invention; Figure 3 A schematic diagram of a vertical-axis impeller skew rotation corrector cavity containing two parallel planes according to an embodiment of the present invention; Figure 4 A schematic diagram of the relationship between the concave spherical surface and the convex spherical surface of the correction cavity of a vertical axis impeller skew rotation corrector according to an embodiment of the present invention; Figure 5 A cross-sectional view of a vertical-axis impeller skew rotation corrector according to an embodiment of the present invention; Figure 6 A cross-sectional view of an eccentric body of a vertical-axis impeller skew rotation corrector according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the initial state of a vertical-axis impeller skew rotation corrector (including a concave spherical surface and a convex spherical surface) according to an embodiment of the present invention; Figure 8 A schematic diagram of the working state of a vertical-axis impeller skew rotation corrector (including a concave spherical surface and a convex spherical surface) according to an embodiment of the present invention; Fig. 9 The present invention is a schematic diagram of a vertical axis impeller equipped with a corrector and a vertical axis wind turbine according to an embodiment of the present invention.

[0026] Description of Figure Numbers: 1. Correction cavity, 1.1. Cavity, 1.2. End cover, 1.21. Inner surface of the first end cover, 1.22. Inner surface of the second end cover, 1.23. Spherical radius, 1.24. Center of sphere, 1.3. Cylinder wall, 1.31. Inner surface of cylinder wall, 2. Eccentric body, 2.101. End face of the first eccentric body, 2.102. End face of the second eccentric body, 2.2. Side face of the eccentric body, 3. Correction medium, 4. Impeller, 4.1. Blades, 4.2. Connecting rod, 4.3. Rotating shaft, 4.4. Rotating axis, 5. Generator, 6. Tower.

[0027] It is worth noting that the above drawings are used to illustrate the features of the present invention, and are not intended to show any actual structure or reflect the size, relative proportions and other detailed information of various components. In order to more clearly show the principles of the present invention and to avoid unnecessary details that make the principles of the present invention unclear, the examples in the figures have been simplified. These illustrations will not cause inconvenience to technicians in the relevant fields in understanding this patent, and the actual embodiment may include more modules or components. DETAILED DESCRIPTION

[0028] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the embodiment of the present invention is fully described below in conjunction with the relevant drawings of the embodiment of the present invention. This patent describes only a part of the embodiments, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] 1. The problem of skew rotation when the conventional vertical axis impeller rotates According to basic aerodynamic principles, when the wind speed is high enough, the blades of a vertical axis impeller obtain torque to drive the impeller to rotate, and also obtain resistance or thrust. For a vertical axis impeller, this thrust is perpendicular to the rotation axis of the impeller. As the main load of a vertical axis impeller, the thrust load can even be comparable to the gravity load of the entire impeller. Structurally, the vertical axis impeller is actually supported at the top by the generator and tower cantilever at the bottom. Figure 1 As shown in the figure, when the impeller is subjected to thrust (i.e. lateral force), due to its cantilever structure, the impeller will be more likely to deflect in the direction of the thrust, causing the impeller's rotation axis to deviate from the theoretical reference axis that is perpendicular to the horizontal. Taking the center point A at the top of the impeller shaft (point A is on the impeller's rotation axis) as an example, due to the deflection of the impeller's rotation axis, during operation, the motion trajectory of point A is actually a curve that is approximately circular, rather than a point in theory.

[0030] When the power of a vertical axis wind turbine increases, the length of the blades will inevitably increase, so the length of the impeller shaft will also increase. The increase in shaft length means the increase in cantilever structure length, making the above-mentioned skew rotation phenomenon more likely to occur. Similar to the horizontal displacement (generally the largest horizontal displacement at the top) of a tall building when subjected to external loads (such as wind loads), the magnitude of this horizontal displacement is positively correlated with the height of the tall building, that is, the higher the height, the greater the horizontal displacement.

[0031] 2. Basic Concept of Patent The core technical features of the skew rotation corrector proposed in this patent can be summarized as follows: 1) The interior of the correction cavity is hollow, and a cavity is formed by the upper and lower end covers and the cylinder wall between the end covers, and the inner surfaces of the upper and lower end covers are respectively and simultaneously set to parallel planes or parallel spherical surfaces.

[0032] 2) An eccentric body is arranged in the cavity, and the upper and lower end surfaces of the eccentric body move freely in any direction on the first end cover inner surface and the second end cover inner surface of the end cover through direct surface contact or rolling bodies. The first end cover inner surface and the second end cover inner surface of the end cover can be functionally regarded as the track for the movement of the eccentric body.

[0033] 3) In the cavity, the space outside the eccentric body is filled with a correction medium, which is a liquid, a semi-solid, or discrete solid particles.

[0034] The skew rotation corrector is installed at the top of the impeller shaft. The above technical features enable the eccentric body to leave the center position due to the action of gravity and centrifugal force when the impeller shaft is deflected, and move along the track formed by the inner surface of the first end cover and the inner surface of the second end cover of the upper and lower end covers in the direction of deflection. Since the space inside the wall is filled with the eccentric body and the correction medium, the movement of the eccentric body in the deflection direction causes the correction medium originally evenly distributed around the eccentric body to move in the opposite direction of the deflection direction, resulting in more correction medium being distributed in the opposite direction of the deflection direction. Under this condition of uneven mass distribution, the centrifugal force and gravity cause the entire skew rotation corrector to generate a force in the opposite direction of the thrust, resulting in the effect of resisting the thrust, thereby achieving the purpose of correction.

[0035] 3. An embodiment of a vertical axis impeller The vertical axis impeller skew rotation corrector mainly consists of three parts: a correction chamber (1), an eccentric body (2) and a correction medium (3).

[0036] like Figure 2As shown, the calibration chamber (1) is a shell structure with a hollow interior, and contains a sufficiently large cavity (1.1) therein. The calibration chamber (1) is generally composed of three parts: upper and lower end covers (1.2) and a cylinder wall (1.3), wherein the cylinder wall (1.3) can be regarded as an annular thin-walled structure, which is arranged between the upper and lower end covers (1.2). The cavity (1.1) is composed of the upper and lower end covers (1.2) and the cylinder wall (1.3).

[0037] The cavity (1.1) has three surfaces in total, including: the inner surfaces of the two end covers (1.2) facing the cavity and the inner surface (1.31) of the tube wall (1.3) facing the cavity. Among them, the upper end cover (1.2) is the inner surface of the first end cover, and the lower end cover (1.2) is the inner surface of the second end cover. The inner surface (1.21) of the first end cover and the inner surface (1.22) of the second end cover are arranged in such a way that they are both planes or both spherical surfaces ( Figure 2 An embodiment that is also spherical is shown).

[0038] like Figure 3 As shown, when the first end cover inner surface (1.21) and the second end cover inner surface (1.22) are both planes, the first end cover inner surface (1.21) and the second end cover inner surface (1.22) are configured as two mutually parallel surfaces.

[0039] When the first end cover inner surface (1.21) and the second end cover inner surface (1.22) are both spherical surfaces, the first end cover inner surface (1.21) is a concave spherical surface (or a part of a concave spherical surface), and the second end cover inner surface (1.22) is a convex spherical surface (or a part of a convex spherical surface). Figure 4 As shown, in this embodiment, the spherical radius (1.23) of the inner surface (concave spherical surface) (1.21) of the first end cover is greater than or equal to the spherical radius (1.23) of the inner surface (convex spherical surface) (1.22) of the second end cover, which can be divided into two modes: 1) If Figure 4 As shown in the right figure, when the spherical radius (1.23) of the inner surface (concave spherical surface) (1.21) of the first end cover is greater than the spherical radius (1.23) of the inner surface (convex spherical surface) (1.22) of the second end cover, in fact, the two spheres where the inner surface (concave spherical surface) (1.21) of the first end cover and the inner surface (convex spherical surface) (1.22) of the second end cover are located are concentric spheres, that is, the centers (1.24) of the spheres where the inner surface (concave spherical surface) (1.21) of the first end cover and the inner surface (convex spherical surface) (1.22) of the second end cover coincide, but the radii are different.

[0040] 2) If Figure 4As shown in the left figure, when the spherical radius (1.23) of the inner surface (concave spherical surface) (1.21) of the first end cover is equal to the spherical radius (1.23) of the inner surface (convex spherical surface) (1.22) of the second end cover, it can be regarded that the inner surface (convex spherical surface) (1.22) of the second end cover is the inner surface (concave spherical surface) (1.21) of the first end cover, and has moved a certain distance toward the center of the sphere (1.24) along a spherical radius (1.23) passing through the geometric center of the inner surface (concave spherical surface) (1.21).

[0041] When the first method is adopted, the surface area of ​​the inner surface (concave spherical surface) (1.21) of the first end cover is greater than the surface area of ​​the inner surface (convex spherical surface) (1.22) of the second end cover, and the inner surface (1.31) of the cylinder wall can be processed into a conical surface; when the second method is adopted, the surface area of ​​the inner surface (concave spherical surface) (1.21) of the first end cover is equal to the surface area of ​​the inner surface (convex spherical surface) (1.22) of the second end cover, and the inner surface (1.31) of the cylinder wall can be processed into a cylindrical surface. Regardless of which method is adopted, the inner surface (concave spherical surface) (1.21) of the first end cover and the inner surface (convex spherical surface) (1.22) of the second end cover are two spherical surfaces parallel to each other.

[0042] Generally, for the convenience of processing, the inner surface (1.31) of the cylinder wall is a continuous smooth curved surface (like the conical surface or cylindrical surface described above). In practical applications, it may be necessary to add some features to the inner surface (1.31) of the cylinder wall due to some special reasons, but it does not affect the correction effect of the corrector.

[0043] The entire correction cavity (1) can be viewed as a disc-like structure in appearance. In practical applications, the radial dimension of the correction cavity (1) is larger than the axial dimension, so that the correction cavity (1) looks like a flat disc.

[0044] like Figure 5 and Figure 6 As shown, the eccentric body (2) is a structure disposed in the cavity (1.1), which includes at least three surfaces: two eccentric body end surfaces and one side surface. The two eccentric body end surfaces are respectively a first eccentric body end surface (2.101) and a second eccentric body end surface (2.102). The first eccentric body end surface (2.101) is opposite to the first end cover inner surface (1.21) of the upper end cover (1.2), the second eccentric body end surface (2.102) is opposite to the second end cover inner surface (1.22) of the lower end cover (1.2), and the side surface (2.2) of the eccentric body is opposite to the inner surface (1.31) of the cylinder wall of the cavity. At the same time, the side surface (2.2) of the eccentric body is processed into a continuous and smooth curved surface in actual applications, which is a conical surface or a cylindrical surface. It can correspond to the form of the inner surface (1.31) of the cylinder wall mentioned in the above content.

[0045] The first eccentric body end face (2.101) and the second eccentric body end face (2.102) respectively enable the eccentric body (2) to freely move in any direction on the first end cover inner surface (1.21) and the second end cover inner surface (1.22) through direct surface contact or rolling bodies. In this embodiment, the first eccentric body end face (2.101) and the second eccentric body end face (2.102) are in direct surface contact with the first end cover inner surface (1.21) and the second end cover inner surface (1.22), that is, the eccentric body (2) and the cavity (1.1) of the correction cavity form a kinematic pair. When the first eccentric body end face (2.101) and the second eccentric body end face (2.102) are in rolling contact with the first end cover inner surface (1.21) and the second end cover inner surface (1.22), ball bearings or rollers can be selected.

[0046] In fact, the inner surface (1.21) of the first end cover and the inner surface (1.22) of the second end cover can be regarded as the track for the eccentric body (2) to move inside the cavity (1.1), and the eccentric body (2) moves along the inner surface (1.21) of the first end cover and the inner surface (1.22) of the second end cover (or under the constraints of the inner surface (1.21) of the first end cover and the inner surface (1.22) of the second end cover.

[0047] like Figure 3 , Figure 7 and Figure 8 As shown, a calibration medium (3) is also provided in the cavity (1.1) of the calibration cavity. The calibration medium (3) fills the entire space around the eccentric body (2). The calibration medium (3) is a liquid, or a semi-solid (such as lipids) or discrete solid particles. In practical applications, the calibration medium (3) may be a liquid with good fluidity, easy availability and low cost.

[0048] Installation of impeller skew rotation corrector in vertical axis wind turbine: like Fig. 9 As shown, a vertical axis wind turbine is generally composed of an impeller (4), a generator (5) and a tower (6), wherein the impeller (4) mainly comprises blades (4.1), a connecting rod (4.2) and a rotating shaft (4.3), and the blades (4.1) are connected to the rotating shaft (4.3) via the connecting rod (4.2).

[0049] The impeller deflection rotation corrector is arranged at the top end of the vertical axis wind turbine unit shaft (4.3), and the end cover (1.2) including the convex spherical surface (1.22) is connected to the top end of the shaft (4.3), that is, the first end cover inner surface (1.21) in the cavity (1.1) is on the top, and the second end cover inner surface (1.22) is on the bottom. In some other embodiments, if the connecting rod (4.2) is also located at the top end of the shaft (4.3), then the end cover (1.2) including the second end cover inner surface (1.22) in the corrector can also be connected to the connecting rod (4.2).

[0050] The geometric centers of the inner surface (1.21) of the first end cover and the inner surface (1.22) of the second end cover in the vertical axis impeller skew rotation corrector are both on the rotation axis (4.4) of the impeller. In this embodiment, it can be considered that the geometric center axis of the internal cavity (1.1) of the corrector coincides with the rotation axis (4.4) of the impeller. When the eccentric body (2) is in the center of the correction cavity (1) in the initial equilibrium state, it can also be considered that the geometric center axis of the eccentric body (2) coincides with the rotation axis (4.4) of the impeller.

[0051] Since the correction medium (3) may be lost in actual applications (similar to the loss of lubricating oil, grease or coolant), a supplementary hole is provided on the end cover (1.2) or the cylinder wall (1.3) of the correction cavity (1) for adding the correction medium (3). The actual location of the supplementary hole should take into account the convenience of the operation when the operation and maintenance personnel add the correction medium (3) to the top of the shaft of the vertical wind turbine.

[0052] The principle by which the above technical solution can correct the skewed rotation of the impeller that occurs in the conventional vertical axis impeller (4) can be summarized as follows: 1) The eccentric body (2) is located at the center of the cavity (1.1) of the correction cavity in the initial state.

[0053] 2) The corrector is installed at the uppermost end of the impeller shaft (4.3) of the vertical axis wind turbine. The reason for this is that the uppermost end of the impeller shaft (4.3) is the position where the maximum deflection displacement occurs during actual operation. The lower end cover (1.2) is connected to the top of the impeller shaft (4.3), and the rotation axis (4.4) of the impeller passes through the center points of the upper and lower end covers (1.2).

[0054] 3) The running tracks of the eccentric body (2) in the cavity (1.1) are the inner surface (1.22) of the second end cover at the bottom and the inner surface (1.21) of the first end cover at the top. In the initial state, that is, when the impeller shaft (4.3) is almost not deflected (for example, when the wind is very small and the impeller (4) is not rotating), the eccentric body (2) is located in the center of the cavity (1.1). Therefore, if Figure 8As shown, when the impeller (4) rotates skewed, the cavity (1.1) also deflects due to the connection between the corrector and the impeller shaft (4.3). The eccentric body (2) leaves the central initial position and moves in the direction of deflection (that is, the direction of thrust).

[0055] 4) The eccentric body (2) in the cavity (1.1) is surrounded by the correction medium (3). In the initial state, the eccentric body (2) is located in the center of the cavity (1.1). Therefore, from the overall point of view, the correction medium (3) around the eccentric body (2) can be regarded as uniformly distributed. When the eccentric body (2) leaves the central initial position and moves in the direction of deflection (that is, the direction of thrust), the correction medium (3) originally located near the deflection direction flows in the opposite direction of the deflection direction within the limited space of the cavity (1.1), thereby causing the correction medium (3) to be more distributed in the opposite direction of the deflection direction, resulting in an unbalanced mass distribution.

[0056] 5) The mass imbalance caused by the uneven distribution of the correction medium (3) causes the center of gravity of the corrector to leave the initial center position of the cavity (1.1) and change in the opposite direction of the deflection direction. It can also be understood that it causes the gravity load of the corrector to be eccentric. The eccentric load caused by the center of gravity shift provides a driving force for the eccentric rotation of the correction impeller (4).

[0057] The whole process can be summarized as follows: the thrust (lateral force) causes the impeller (4) to rotate obliquely, causing the eccentric body (2) to move and the distribution of the correction medium (3) to change, thereby causing the center of gravity of the corrector to shift (in the opposite direction of the impeller (4) deflection direction), ultimately causing the gravity load to be offset, and relying on the offset load to achieve the correction of the oblique rotation of the impeller (4).

[0058] The eccentric body (2) can have many structural forms, and can be a hollow shell structure with a hollow interior (the structural form adopted in this embodiment, such as Figure 5 The eccentric body (2) should be a structure that occupies more space in the cavity (1.1) than the correction medium (3) and has a smaller total mass than the correction medium (3). This structural form enables the eccentric body (2) to move away from the initial position toward the side of the impeller (4) and the correction medium (3) to move to the other side, and the overall center of gravity of the corrector is close to the side of the correction medium (3). Otherwise, the corrector will lose its correction ability or the correction effect will be insignificant.

[0059] At the same time, the total mass of the eccentric body (2) should be smaller than the total mass of the correction medium (3), and the volume of the eccentric body (2) should be large enough to force more and heavier correction medium (3) to move to the other side after it deviates from the central position. Therefore, the radial dimension of the eccentric body (2) needs to be large enough. In this embodiment, the radial dimension of the eccentric body (2) exceeds half of the radial dimension of the cavity (1.1), that is, when the eccentric body (2) is at any position in the cavity (1.1), the geometric center axis of the cavity (1.1) always passes through the eccentric body (2).

[0060] The novelties and advantages of the above technical solution are: 1) A solution is proposed for the common problem of skewed rotation of the impeller (4) in vertical axis wind turbines. Conventional mechanical rotating parts often use springs, bearings or eccentric wheels to compensate for the eccentric rotation of the rotating parts. However, these compensation methods do not need to consider lateral forces. In contrast, in vertical axis wind turbines, the main reason for the skewed rotation of the impeller (4) is the externally applied aerodynamic thrust (i.e., lateral force), and is not caused by problems in the assembly process of conventional mechanical rotating parts or long-term operation as in traditional industries.

[0061] 2) In the initial state, the centrifugal body is set at the center of the cavity (1.1) so that its geometric center axis coincides with the impeller rotation axis (4.4). In fact, the centrifugal body is in a temporarily stable equilibrium state. Once the impeller (4) is driven by external pneumatic thrust to rotate skewed, the centrifugal body can easily jump out of the equilibrium state and leave the central position. This setting makes the regulator very sensitive and can quickly respond to the skew rotation phenomenon that has occurred and is continuing.

[0062] 3) The radial dimension of the corrector is relatively large. When the correction medium (3) forms a mass distribution concentrated on one side due to the movement of the deflected body, it is easier to form a larger weight-diameter product, further improving the correction effect on the deflection rotation.

[0063] 4) The corrector has a simple structure and uses gravity, centrifugal force and other forces to achieve the effect of skew rotation correction through a purely mechanical structure.

[0064] 5) After the mechanical structure is determined, it can be easily installed on the top of any vertical axis wind turbine shaft (4.3), and has strong compatibility.

[0065] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up, down, front, back, left and right" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A vertical axis impeller skew rotation corrector, characterized in that: It comprises a correction cavity (1), an eccentric body (2) and a correction medium (3); The calibration cavity (1) is hollow inside, forming a cavity (1.1); the cavity (1.1) is composed of two end covers (1.2) and a cylinder wall (1.3) disposed between the two end covers (1.2); the surfaces of the end covers (1.2) facing the cavity (1.1) are respectively the inner surface (1.21) of the first end cover and the inner surface (1.22) of the second end cover; The eccentric body (2) is arranged in the cavity (1.1); the eccentric body (2) is a structure comprising at least three faces, two of which are eccentric body end faces; the two eccentric body end faces are respectively a first eccentric body end face (2.101) and a second eccentric body end face (2.102); The first eccentric body end surface (2.101) and the second eccentric body end surface (2.102) are respectively free to move in any direction on the first end cover inner surface (1.21) and the second end cover inner surface (1.22) through direct surface contact or rolling bodies; The correction medium (3) is a liquid or a semi-solid or discrete solid particles; in the cavity (1.1), the space outside the eccentric body (2) is filled with the correction medium (3).

2. A vertical axis impeller skew rotation corrector according to claim 1, characterized in that: The surface of the cylinder wall (1.3) facing the cavity (1.1) is a continuous curved surface.

3. The vertical axis impeller skew rotation corrector according to claim 1, characterized in that: The first end cover inner surface (1.21) and the second end cover inner surface (1.22) are both planes or both spherical surfaces; when the first end cover inner surface (1.21) and the second end cover inner surface (1.22) are both spherical surfaces, the first end cover inner surface (1.21) is a concave spherical surface, and the second end cover inner surface (1.22) is a convex spherical surface.

4. A vertical axis impeller skew rotation corrector according to claim 1, characterized in that: The first end cover inner surface (1.21) and the second end cover inner surface (1.22) are parallel to each other.

5. The vertical axis impeller skew rotation corrector according to claim 1, characterized in that: The surface of the eccentric body (2) located between the two eccentric body end surfaces is a continuous curved surface.

6. A vertical axis impeller skew rotation corrector according to claim 1, characterized in that: The eccentric body (2) is a sealed hollow shell structure, or a sealed hollow shell structure with reinforcing ribs or reinforcing rods arranged inside.

7. A vertical axis impeller skew rotation corrector according to claim 1, characterized in that: The end cover (1.2) or the cylinder wall (1.3) of the calibration chamber (1) is provided with a supplementary hole for adding a calibration medium (3).

8. A vertical axis wind turbine, characterized in that: It comprises a vertical axis impeller skew rotation corrector as claimed in any one of claims 1 to 7; the vertical axis wind turbine set further comprises an impeller (4), and the impeller (4) comprises blades (4.1), a connecting rod (4.2) and a rotating shaft (4.3).

9. A vertical axis wind turbine according to claim 8, characterized in that: The vertical axis impeller skew rotation corrector is arranged at the top end of the rotating shaft (4.3), and an end cover (1.2) in the vertical axis impeller skew rotation corrector including a second end cover inner surface (1.22) is connected to the top end of the rotating shaft (4.3).

10. A vertical axis wind turbine according to claim 8, characterized in that: The geometric centers of the first end cover inner surface (1.21) and the second end cover inner surface (1.22) in the vertical axis impeller skew rotation corrector are both on the rotation axis (4.4) of the impeller.

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