Protection device and wind generating set comprising same

Abstract

The utility model provides a protection device and a wind generating set comprising the same, the protection device is used for the wind generating set, the wind generating set comprises a tower drum and a blade, and the blade comprises a blade tip; the protection device comprises a protection ring, the protection ring is arranged around the tower drum in the circumferential direction of the tower drum and fixedly connected with the tower drum, and the set height of the protection ring to the ground corresponds to the height of the lowest point of the blade tip to the ground when the blade rotates; the protection ring is made of low-yield-strength steel; the wind generating set comprises the protection device. According to the utility model, the protection ring is arranged, so that when the blade sweeps the tower, the blade tip firstly impacts the protection ring arranged around the tower drum, and the blade is prevented from directly impacting and damaging the tower drum. Through good plasticity and toughness of low-yield-strength steel, impact energy is absorbed through deformation, so that the impact energy generated by blade impact is partially absorbed, damage to a tower drum caused by blade tower sweeping is reduced, and the overall reliability of the tower drum and the wind generating set is improved.

Description

Technical Field

[0001] The utility model relates to the field of wind turbines, and particularly relates to a protection device and a wind turbine including the same. Background Art

[0002] As a new type of energy, wind power is being applied more and more widely. As a conventional support structure, the steel tower occupies the mainstream market due to many advantages such as convenient material acquisition, simple manufacturing, and fast hoisting.

[0003] On the one hand, as a thin-walled structure, the bearing capacity of the steel tower barrel is not only controlled by strength but also by buckling bearing capacity, and the buckling bearing capacity is closely related to the shape and defects of the tower barrel. When there is a 1-cm depression, it may cause a large reduction in the buckling bearing capacity. Therefore, various manufacturing defects of the tower barrel, such as out-of-roundness and local depression, are strictly required during manufacturing. On the other hand, with the increasing power of the unit, the blades are getting longer and longer, and due to the imperfect fan control system, the situation of blade hitting the tower often occurs. Since the tip of the blade is closest to the tower barrel, the tower hitting generally occurs at the tip of the blade.

[0004] When a blade rotates, it has a large amount of kinetic energy. When the tip of the blade collides with the tower barrel, a large concentrated impact load will be applied to the tower barrel. As a thin-walled structure, the tower barrel does not consider such a load in its design, and a depression will be generated here, and then its buckling bearing capacity will be greatly reduced. When it cannot bear its own weight and the corresponding wind load, a tower collapse accident will occur. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to overcome the defect that the blade of the wind turbine in the prior art may hit the tower barrel, thereby affecting the stability of the tower barrel, and to provide a protection device and a wind turbine including the same.

[0006] The utility model solves the above technical problem through the following technical solutions:

[0007] A protection device is used for a wind turbine. The wind turbine includes a tower barrel and a blade, and the blade includes a tip. The protection device includes a protection ring, which is arranged around the tower barrel along the circumferential direction of the tower barrel and is fixedly connected to the tower barrel. The installation height of the protection ring from the ground corresponds to the height of the lowest point of the tip of the blade from the ground when the blade rotates. The material of the protection ring is low-yield-strength steel.

[0008] In this solution, a protective ring fixedly connected to the tower barrel is arranged around the tower barrel in the circumferential direction of the tower barrel, so that when the phenomenon of the blade hitting the tower occurs, the blade does not directly hit the tower barrel, but first hits the protective ring arranged around the tower barrel, so as to prevent the blade from directly hitting and damaging the tower barrel. Among them, the low yield strength steel has good plasticity and toughness and can absorb impact through deformation. By setting the material of the protective ring as low yield strength steel, it can yield and deform under the impact and then absorb energy, so as to achieve the effect of absorbing impact and reducing the damage to the tower barrel; the remaining impact is conducted through the damping ring and is transmitted to the tower barrel in the form of a surface load from a concentrated load, reducing the impact strength locally received by the tower barrel, and can further increase the reliability of the tower barrel and the wind turbine generator set.

[0009] Among them, since the blade tip is the position of the blade closest to the tower barrel, when the blade hitting the tower occurs, generally the position where the blade hits the tower barrel is the blade tip. Therefore, the installation height of the protective ring is set to correspond to the height from the ground at the lowest point of the blade tip when the blade rotates. The distance from the ground at the lowest point passed by the blade tip when the blade rotates is not greater than the distance from the ground to the upper surface of the side of the protective ring away from the ground and not less than the distance from the ground to the lower surface of the side of the protective ring close to the ground, ensuring that when the blade tip moves close to the tower barrel, it first contacts the protective ring in the horizontal direction, and also enabling the protective ring to be set according to the height of the blade tip rather than sleeved on the entire outer wall of the tower barrel, reducing the processing difficulty and cost.

[0010] Preferably, the center of the protective ring in the height direction of the tower barrel is at the same horizontal plane as the lowest point passed by the blade tip.

[0011] In this solution, by making the center of the protective ring in the height direction of the tower barrel be at the same horizontal plane as the lowest point passed by the blade tip, when the blade tip hits, it is closer to the middle of the protective ring in the height direction, making the impact more easily conducted to the entire protective ring, causing the protective ring to deform and absorb the impact; when the blade tip approaches the tower barrel, it is more likely to fall into the protection range of the protective ring in the height direction of the tower barrel and hit the protective ring.

[0012] Preferably, the diameter of the protective ring is 10 cm to 60 cm larger than the diameter of the tower barrel at the installation position of the protective ring; and / or, the width of the protective ring in the height direction of the tower barrel is 0.4 m to 1 m; and / or, the thickness of the protective ring in the radial direction of the tower barrel is 10 mm - 25 mm.

[0013] Preferably, a damping ring is provided between the protective ring and the tower barrel. The damping ring is sleeved on the tower barrel, the outer surface of the damping ring abuts against the protective ring, and the inner surface of the damping ring abuts against the tower barrel.

[0014] In this solution, a shock-absorbing ring is provided between the protective ring and the tower barrel, so that when the blade sweeps the tower, the impact of the blade can be further dispersed to the tower barrel through the shock-absorbing ring. After part of the impact is absorbed by the protective ring, the remaining impact is conducted through the shock-absorbing ring and is dispersed from a concentrated load into a surface load form and transmitted to the tower barrel, reducing the impact intensity locally received by the tower barrel and preventing large local deformation of the tower barrel, which may cause a significant decrease in the buckling bearing capacity and further lead to tower collapse.

[0015] Preferably, the projection of the shock-absorbing ring on the surface of the tower barrel at least covers the projection of the protective ring on the surface of the tower barrel.

[0016] In this solution, by making the projection of the shock-absorbing ring on the surface of the tower barrel at least cover the projection of the protective ring on the surface of the tower barrel, the height of the shock-absorbing ring and the protective ring is the same along the height direction of the tower barrel, and the covering area of the shock-absorbing ring along the height direction of the tower barrel is not less than that of the protective ring along the height direction of the tower barrel, so that the load caused by the impact can be fully conducted to the shock-absorbing ring and the impact damage can be reduced through shock absorption.

[0017] Preferably, the protection device includes a support structure, which is distributed circumferentially on the outer wall of the tower barrel, fixedly connected to the tower barrel, and abuts against the surface of the protective ring and the shock-absorbing ring close to the ground.

[0018] In this solution, by setting the support structure to support the protective ring and the shock-absorbing ring, the connection method of fixedly connecting the protective ring to the tower barrel by welding or other means is replaced, reducing the welding or structural modification of the outer wall of the tower barrel and minimizing the impact on the structural strength of the tower barrel.

[0019] Preferably, the support structure includes at least three support rods evenly distributed circumferentially on the outer surface of the tower barrel. One end of the support rod is fixedly connected to the tower barrel, and the other end extends in the radial direction of the tower barrel and exceeds the protective ring.

[0020] In this solution, the protective ring and the shock-absorbing ring are supported by making the support structure include at least three support rods evenly distributed circumferentially on the outer surface of the tower barrel. The support effect is achieved through the setting of the support rods, and uniform support is achieved through circumferential distribution, and the area required for support is minimized as much as possible, so as to minimize the morphological change and processing such as welding of the outer wall of the tower barrel and maintain the structural strength of the tower barrel.

[0021] Preferably, the material of the shock-absorbing ring includes any one of rubber, wood, plastic, and polyurethane.

[0022] Preferably, the low yield strength steel includes any one of LY100, LY160, LY225, and Q235 steel.

[0023] This solution also provides a wind turbine generator, which includes the above protection device.

[0024] The positive and progressive effects of the present utility model are as follows: By arranging a protective ring fixedly connected to the tower barrel around the tower barrel in the circumferential direction of the tower barrel, when the phenomenon of the blade sweeping the tower occurs, the blade does not directly impact the tower barrel, but first impacts the protective ring arranged around the tower barrel, so as to prevent the blade from directly impacting and damaging the tower barrel. Among them, the low yield strength steel has good plasticity and toughness and can absorb impact through deformation. By setting the material of the protective ring as low yield strength steel, it can yield and deform under the impact action and then absorb energy, so as to achieve the effect of absorbing impact and reducing the damage to the tower barrel; the remaining impact is conducted through the damping ring and is transmitted to the tower barrel in the form of a surface load from the concentrated load, reducing the impact strength locally received by the tower barrel, and further increasing the overall reliability of the tower barrel and the wind turbine generator set. Description of the Drawings

[0025] Figure 1 It is a schematic cross-sectional view of the overall structure of the protection device provided in the embodiment of the present utility model and installed on a wind turbine generator set.

[0026] Figure 2 is Figure 1 The sectional view of the protection device in

[0027] Figure 3 is Figure 1 The sectional view from the top-down angle when the protection device is installed on the wind turbine generator set in

[0028] Description of the Reference Numerals in the Drawings:

[0029] Protective ring 1

[0030] Damping ring 2

[0031] Support structure 3

[0032] Tower barrel 4

[0033] Blade 5

[0034] Tip 6 Detailed Embodiment

[0035] The following is a preferred embodiment, and the present utility model will be described more clearly and completely in combination with the drawings, but the present utility model is not limited to the scope of this embodiment.

[0036] As Figures 1 - 3 shown, this embodiment provides a protection device. The protection device is used for a wind turbine generator set. The wind turbine generator set includes a tower barrel 4 and a blade 5. The blade 5 includes a tip 6; the protection device includes a protective ring 1. The protective ring 1 is arranged around the tower barrel 4 in the circumferential direction of the tower barrel 4 and is fixedly connected to the tower barrel 4. The installation height of the protective ring 1 from the ground corresponds to the height of the lowest point of the tip 6 from the ground when the blade 5 rotates; the material of the protective ring 1 is low yield strength steel.

[0037] In this embodiment, a protective ring 1 fixedly connected to the tower barrel 4 is arranged around the tower barrel 4 in the circumferential direction of the tower barrel 4, so that when the phenomenon of the blade 5 sweeping the tower occurs, the blade 5 does not directly impact the tower barrel 4, but first impacts the protective ring 1 arranged around the tower barrel 4, so as to prevent the blade 5 from directly impacting and damaging the tower barrel 4. Among them, the low yield strength steel has good plasticity and toughness and can absorb impact through deformation. By setting the material of the protective ring 1 as low yield strength steel, the impact of the blade 5 hitting can be partially absorbed, so as to reduce the damage to the tower barrel 4 caused by the blade 5 hitting the tower barrel 4 and increase the reliability of the tower barrel 4 and the overall wind turbine generator set.

[0038] Among them, since the blade tip 6 is the position of the blade 5 closest to the tower barrel 4, when the blade 5 sweeps the tower, generally the position where the blade 5 impacts the tower barrel 4 is the blade tip 6. Therefore, the installation height of the protective ring 1 is set to correspond to the height from the ground at the lowest point of the blade tip 6 when the blade 5 rotates. The distance from the ground at the lowest point passed by the blade tip 6 when the blade 5 rotates is not greater than the distance from the ground to the upper surface of the protective ring 1 on the side away from the ground and not less than the distance from the ground to the lower surface of the protective ring 1 on the side close to the ground, ensuring that when the blade tip 6 moves closer to the tower barrel 4, it first contacts the protective ring 1 in the horizontal direction, and also enabling the protective ring 1 to be set according to the height of the blade tip 6 rather than sleeved on the outer wall of the entire tower barrel 4, reducing the processing difficulty and cost.

[0039] As Figure 1 shown, the center of the protective ring 1 in the height direction of the tower barrel 4 is on the same horizontal plane as the lowest point passed by the blade tip 6. By making the center of the protective ring 1 in the height direction of the tower barrel 4 be on the same horizontal plane as the lowest point passed by the blade tip 6, when the blade tip 6 impacts, it is closer to the middle of the protective ring 1 in the height direction, making the impact more easily conducted to the entire protective ring 1, causing the protective ring 1 to deform and absorb the impact; when the blade tip 6 approaches the tower barrel 4, it is more likely to fall into the protection range of the protective ring 1 in the height direction of the tower barrel 4 and impact the protective ring 1.

[0040] In other embodiments, it can also be other positions, such as making the lowest point passed by the blade tip 6 be at one end of the protective ring 1 away from the ground or at one end close to the ground, based on the impact position of the blade tip 6 falling into the protection range of the protective ring 1 in the height direction of the tower barrel 4 when the impact occurs.

[0041] As a preferred embodiment, as Figures 1 - 3As shown in the figure, a vibration damping ring 2 is provided between the protective ring 1 and the tower barrel 4. The vibration damping ring 2 is sleeved on the tower barrel 4. The outer surface of the vibration damping ring 2 abuts against the protective ring 1, and the inner surface of the vibration damping ring 2 abuts against the tower barrel 4. In this embodiment, by providing the vibration damping ring 2 between the protective ring 1 and the tower barrel 4, when the blade 5 sweeps the tower, the impact of the blade 5 can be further dispersed to the tower barrel 4 through the vibration damping ring 2. After a part of the impact is absorbed by the protective ring 1, the remaining impact is conducted through the vibration damping ring 2 and is transferred to the tower barrel 4 in the form of a surface load from a concentrated load, reducing the impact strength locally received by the tower barrel 4 and preventing large deformation from occurring locally on the tower barrel 4, which would cause a significant decrease in the buckling bearing capacity and further lead to tower collapse.

[0042] In other embodiments, it can also be designed by those skilled in the art according to actual needs. The solution that only the protective ring 1 is adopted can also absorb the impact by this protection device, reduce the damage to the tower barrel 4 caused by the blade 5 hitting the tower barrel 4, and increase the reliability of the tower barrel 4 and the overall wind turbine generator set. When both the protective ring and the vibration damping ring are present, when blade tower sweeping occurs due to improper control, bad weather or other reasons, the blade tip 6 will collide with the protective ring 1: on the one hand, since the protective ring 1 is made of low yield strength steel, it will deform and yield under the action of the concentrated impact load, so this protective ring 1 will absorb a part of the impact energy transmitted by the blade 5; on the other hand, the remaining impact energy will be transmitted to the tower barrel 4 through the vibration damping ring 2. Due to the presence of the vibration damping ring 2, the energy is not transmitted to the tower barrel 4 through a concentrated load, but is transmitted to the tower barrel 4 in the form of a surface load. At this time, the tower barrel 4 will not form a large defect locally, and the situation of a significant reduction in the buckling bearing capacity will not occur, resulting in tower collapse.

[0043] As Figures 1 - 2 shown, as a preferred embodiment, the projection of the vibration damping ring 2 on the surface of the tower barrel 4 at least covers the projection of the protective ring 1 on the surface of the tower barrel 4. By making the projection of the vibration damping ring 2 on the surface of the tower barrel 4 cover the projection of the protective ring 1 on the surface of the tower barrel 4, along the height direction of the tower barrel 4, the vibration damping ring 2 completely separates the protective ring 1 from the surface of the tower barrel 4, enabling the load caused by the impact to be fully conducted to the vibration damping ring 2 and reducing the impact damage through vibration damping, achieving better vibration damping.

[0044] As a specific embodiment, in this embodiment, the projections of the vibration damping ring 2 and the protective ring 1 on the surface of the tower barrel 4 coincide, their dimensions in the height direction of the tower barrel 4 are the same, and the heights of the upper and lower edges are the same. The covering area of the vibration damping ring 2 along the height direction of the tower barrel 4 is the same as the covering area of the protective ring 1 along the height direction of the tower barrel 4, enabling the load caused by the impact to be fully conducted to the vibration damping ring 2 and reducing the impact damage through vibration damping, and also saving material costs relatively.

[0045] In other embodiments, the coverage area of the vibration damping ring 2 in the height direction of the tower barrel 4 can be set to be larger than the coverage area of the protection ring 1 in the height direction of the tower barrel 4, and the vibration damping effect of this solution can also be achieved.

[0046] As Figures 1 - 3 shown, the protection device includes a support structure 3. The support structure 3 is distributed circumferentially on the outer wall of the tower barrel 4 and is fixedly connected to the tower barrel 4. The support structure 3 abuts against the surfaces of the protection ring 1 and the vibration damping ring 2 close to the ground. By providing the support structure 3, the protection ring 1 and the vibration damping ring 2 are supported, replacing the connection method of fixedly connecting the protection ring 1 to the tower barrel 4 by welding or the like, reducing the welding or structural modification of the outer wall of the tower barrel 4, and reducing the impact on the structural strength of the tower barrel 4.

[0047] In other embodiments, the protection ring 1 and the vibration damping ring 2 can also be welded or adhesively connected to the tower barrel 4, and the effect of absorbing impact through this protection device and reducing the damage to the tower barrel 4 caused by impact can also be achieved.

[0048] As Figure 3 shown, among them, the number of the support structures 3 is 3 to 8. In this embodiment, the support structure 3 is 6 support rods evenly distributed circumferentially on the outer surface of the tower barrel 4. One end of the support rod is fixedly connected to the tower barrel 4, and the other end extends in the radial direction of the tower barrel 4 and exceeds the protection ring 1. In this embodiment, the protection ring 1 and the vibration damping ring 2 are supported by making the support structure 3 be 6 support rods evenly distributed circumferentially on the outer surface of the tower barrel 4. The support effect is achieved through the arrangement of the support rods, and the protection ring 1 and the vibration damping ring 2 are evenly supported through the circumferential distribution, so that they are kept in their original positions without falling, and the area required for support is reduced as much as possible, thereby reducing the morphological change and processing such as welding of the outer wall of the tower barrel 4 as much as possible, and maintaining the structural strength of the tower barrel 4.

[0049] In other embodiments, those skilled in the art can also design the form and distribution of the support structure 3 according to actual needs, with the criterion of being able to support the protection ring 1 and the vibration damping ring 2. The better range is 3 to 8, not less than three. The more the number of the support structures 3, the smaller the diameter of each support structure 3 can be adjusted adaptively to reduce the impact caused by the welding process with the outer wall of the tower barrel 4.

[0050] In the embodiments provided by the present utility model, the diameter of the protection ring 1 is 10 cm to 60 cm larger than the diameter of the tower barrel 4 at the installation position of the protection ring 1; the width of the protection ring 1 in the height direction of the tower barrel 4 is 0.4 m to 1 m, and the thickness of the protection ring 1 in the radial direction of the tower barrel 4 is 10 mm - 25 mm; the material of the vibration damping ring 2 includes any one of rubber, wood, plastic and polyurethane; the aforementioned low yield strength steel includes any one of LY100, LY160, LY225 and Q235 steel.

[0051] As a specific embodiment, the hub center height of the wind turbine generator is 110 m, the impeller diameter is 200 m, the height of the tip 6 at the lowest point from the ground is 10 m, the diameter of the tower barrel 4 at this height is 4.7 m, the protection ring 1 is an annular cylindrical structure, its diameter is 5 m, its height is 1 m, its thickness is 14 mm, and its center height is located 10 m from the ground. The protection ring 1 is made of LY160 steel.

[0052] The above-mentioned damping ring 2 is an annular cylinder, its height is 1 m, its thickness is 100 mm, and it is located between the steel tower barrel 4 and the protection ring 1. It is made of rubber material.

[0053] The above-mentioned support rod is a circular rod, with a diameter of 2 cm and a length of 20 cm, which extends 5 cm longer than the outer diameter of the above-mentioned protection ring 1. The support rod is connected to the steel tower barrel 4 by welding, and the number is 6. They are evenly arranged along the outer circumference of the tower barrel 4, located below the above-mentioned protection ring 1 and in contact with the protection ring 1 and the damping ring 2, and are used to support the protection ring 1 and the damping ring 2.

[0054] In other embodiments, those skilled in the art can also design the forms and specifications of the protection ring 1, the damping ring 2 and the support structure 3 according to actual needs. Reasonable settings and size modifications can achieve the protection effect of the protection device provided by the present utility model.

[0055] This embodiment also provides a wind turbine generator, which includes the above-mentioned protection device.

[0056] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation of the device or component in normal use, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation at any time. Therefore, it should not be construed as a limitation of the present utility model in this regard.

[0057] Although the specific embodiments of the present utility model have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present utility model is defined by the appended claims. Without departing from the principle and essence of the present utility model, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present utility model.

Claims

1. A protection device, characterized in that, The protection device is used for a wind turbine generator set, which includes a tower barrel and blades, and the blades include blade tips. The protection device includes a protection ring, which is arranged around the tower barrel in the circumferential direction of the tower barrel and fixedly connected to the tower barrel. The installation height of the protection ring from the ground corresponds to the height of the lowest point of the blade tip from the ground when the blade rotates. The material of the protection ring is low yield strength steel.

2. The protection device according to claim 1, characterized in that, The center of the protection ring in the height direction of the tower barrel and the lowest point passed by the blade tip are on the same horizontal plane.

3. The protection device according to claim 1, characterized in that The diameter of the protection ring is 10 cm to 60 cm larger than the diameter of the tower barrel at the installation position of the protection ring. And / or, the width of the protection ring in the height direction of the tower barrel is 0.4 m to 1 m. And / or, the thickness of the protection ring in the radial direction of the tower barrel is 10 mm - 25 mm.

4. The protection device according to any one of claims 1-3, characterized in that, A damping ring is provided between the protection ring and the tower barrel. The damping ring is sleeved on the tower barrel. The outer surface of the damping ring abuts against the protection ring, and the inner surface of the damping ring abuts against the tower barrel.

5. The protection device according to claim 4, characterized in that, The projection of the damping ring on the surface of the tower barrel at least covers the projection of the protection ring on the surface of the tower barrel.

6. The protection device according to claim 4, characterized in that, The protection device includes a support structure, which is distributed along the circumferential direction of the tower barrel on the outer wall of the tower barrel. The support structure is fixedly connected to the tower barrel, and the support structure abuts against the side surfaces of the protection ring and the damping ring close to the ground.

7. The protection device according to claim 6, characterized in that, The support structure includes at least three support rods evenly distributed along the circumferential direction of the tower barrel on the outer surface of the tower barrel. One end of the support rod is fixedly connected to the tower barrel, and the other end extends in the radial direction of the tower barrel and exceeds the protection ring.

8. The protection device according to claim 4, characterized in that, The material of the damping ring includes any one of rubber, wood, plastic, and polyurethane.

9. The protection device according to claim 1, characterized in that, The low yield strength steel includes any one of LY100, LY160, LY225, and Q235 steel.

10. A wind turbine generator, characterized in that, The wind turbine generator set includes the protection device according to any one of claims 1 - 9.

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