A prestressed cable conversion structure for wind turbine towers

Abstract

The present invention relates to the technical field of wind turbine tower auxiliary devices, and in particular to a prestressed cable conversion structure for a wind turbine tower, comprising a tower constraint component and a cable, wherein the tower constraint component is provided with a sliding component, and the tower constraint component is fixed in the tower; the middle part of the cable spans the tower constraint component and is slidably connected to the tower constraint component through the sliding component, and the two ends of the cable are connected to the ground, and the cable can be applied with prestressed stress; the technical solution of the present invention can ensure that the cable and the wind turbine tower bear the load together under any circumstances. At the same time, the present invention can improve the stress state of the wind turbine tower without significantly increasing the deadweight of the wind turbine tower, thereby enhancing the stability and safety of the wind turbine tower, and further enabling the wind turbine set to be used at a higher altitude, thereby better utilizing wind energy for power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power tower auxiliary devices, and in particular to a prestressed cable conversion structure for a wind power tower. Background Art

[0002] In the near-ground layer, wind speed increases significantly with increasing height. In order to obtain a large amount of wind power energy, it is usually necessary to design the wind turbine tower to be relatively high. Therefore, there are also some problems related to this. For example, if the height is too high, the cross-sectional bending moment generated is also very large, which can easily cause the structure to have a large lateral displacement and damage, and can also easily cause the structure to fail in stability. In order to improve the lateral displacement stiffness and structural stability of the wind turbine tower, the existing technology usually uses a number of rods to support the wind turbine tower. This method can effectively solve the above problems, but it also has some defects. For example, after the wind turbine tower has a lateral displacement on one side, stress relaxation will occur, that is, only some rods remain in tension and other rods are in compression, which greatly reduces the effectiveness of the support rods. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a prestressed cable conversion structure for a wind turbine tower, which is used to solve the technical problem that when the wind turbine tower shifts sideways, some cables are subjected to tension and other cables are subjected to pressure, resulting in relaxation.

[0004] To achieve the above-mentioned objectives, the present invention provides a prestressed cable conversion structure for a wind turbine tower, comprising a tower restraint component and a cable, wherein the tower restraint component is provided with a sliding component, and the tower restraint component is fixed in the tower; the middle part of the cable spans the tower restraint component and is slidably connected to the tower restraint component through the sliding component, the two ends of the cable are connected to the ground, and the cable can be applied with prestressed stress.

[0005] Optionally, the tower restraint component includes a cable bracket and a bearing assembly for bearing the cable bracket, the bearing assembly is connected to the tower, and the sliding component is provided on the cable bracket.

[0006] Optionally, the cable bracket includes multiple groups of cable support rods, the sliding component is provided at the upper end of the cable support rod, and a spacing S is left between the horizontal planes where the upper ends of the multiple groups of cable support rods are located, and the spacing S is greater than the diameter of the cable; the number of the cable is the same as the number of groups of the cable support rods, and the multiple cables correspond one-to-one to the multiple groups of cable support rods, and the multiple cables are staggered.

[0007] Optionally, the cable support rod includes a cable support rod A and a cable support rod B, the lower ends of the cable support rod A and the cable support rod B are respectively vertically connected to the bearing assembly, and the sliding component is provided at the upper end. The cable support rod A and the cable support rod B are parallel to each other and have a distance between them.

[0008] Optionally, the longitudinal planes where the cable supports of each group are located are staggered.

[0009] Optionally, the cable bracket also includes multiple auxiliary rods, and the cable support rod A and the cable support rod B each correspond to an auxiliary rod. The auxiliary rod is located on the opposite side of the cable support rod A and the cable support rod B. The upper end of the auxiliary rod is connected to the middle part of the cable support rod, and the lower end is connected to the load-bearing assembly. The auxiliary rod is inclined relative to the cable support rod and the load-bearing assembly.

[0010] Optionally, the cable support rods are in two groups, namely a first group of cable support rods and a second group of cable support rods, the first group of cable support rods are higher than the second group of cable support rods, and the longitudinal plane of the first group of cable support rods is perpendicular to the longitudinal plane of the second group of cable support rods.

[0011] Optionally, the load-bearing assembly includes an annular component and a reinforcement frame, the reinforcement frame is located on the inner side of the annular component and connected to its inner wall, the annular component is connected to the lower end of the cable support rod, and the reinforcement frame is connected to the lower end of the auxiliary rod; the annular component is connected to the tower.

[0012] Optionally, the bearing assembly is connected to the tower via a stabilizing platform, the cross section of the stabilizing platform is circular, and the side wall of the stabilizing platform is connected to the inner side wall of the wind turbine tower.

[0013] Optionally, a plurality of connecting rods are provided at the lower end of the stabilizing platform, the lower ends of the connecting rods are connected to the bearing assembly, and the upper ends of the connecting rods are connected to the stabilizing platform.

[0014] The beneficial effect of the principle of the present invention is that: during installation, pre-tensioning stress is applied to the cable to ensure that the cable is always taut. When the wind turbine tower is laterally displaced in a certain direction, the lateral displacement can be decomposed into the lateral displacement of the tower constraint component, and the middle part of the cable has a sliding connection with the tower constraint component. Therefore, when the wind turbine tower is offset in various directions, it only causes the fixed tower constraint component to be offset, and the cable slides relative to the tower constraint component, thereby keeping the axial force on the cable as tension. Based on the above factors, it can be ensured that the cable and the wind turbine tower bear the load together under any circumstances. In addition, the present invention can improve the stress state of the wind turbine tower without significantly increasing the deadweight of the wind turbine tower, thereby enhancing the stability and safety of the wind turbine tower, and further enabling the wind turbine to be used at a higher altitude, thereby better utilizing wind energy for power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of one perspective of this embodiment;

[0016] Figure 2 This is a structural diagram of another perspective of this embodiment;

[0017] Figure 3 for Figure 2 A local enlarged view of point N in the middle;

[0018] Figure 4 is a schematic diagram of the three-dimensional structure of the tower restraint component;

[0019] Figure 5 This is a structural diagram of the embodiment after being applied to a wind turbine tower;

[0020] Figure 6 This is a schematic diagram of the operation of the embodiment when the wind turbine tower is applied to the wind turbine tower (the wind turbine tower is shown in cross section) and when the wind turbine tower is laterally displaced to the left;

[0021] Figure 7 This is a schematic diagram of the operation of the embodiment when the wind turbine tower is applied to the wind turbine tower (the wind turbine tower is shown in cross section) and when the wind turbine tower is laterally displaced to the right;

[0022] Description of reference numerals:

[0023] 1. Tower restraint component, 1101. First group of cable support rods A, 1102. First group of cable support rods B, 1201. Second group of cable support rods A, 1202. Second group of cable support rods B, 13. Slide, 14. Auxiliary rod, 15. Load-bearing assembly, 1501. Ring component, 1502. Reinforcement frame, 16. Sliding component;

[0024] 2. Stabilizing platform, 3. Guy cables, 4. Connecting rods, 5. Tower. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0026] It should be noted that the diagrams provided in the present embodiment are only schematic illustrations of the basic concept of the present invention. The diagrams only show the units related to the present invention, rather than the number, shape, and size of the units when actually implemented. The types, quantities, and ratios of the units when actually implemented can be changed at will, and the unit layout types may also be more complex. The structures, ratios, and sizes illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for those familiar with the technology to understand and read. They are not intended to limit the limiting conditions for the implementation of the present invention, so they have no technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that the present invention can produce. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of description and are not intended to limit the scope of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of the present invention when there is no substantial change in the technical content.

[0027] This embodiment provides a prestressed cable conversion structure for a wind turbine tower 5, comprising a tower restraint component 1 and a cable 3. The tower restraint component 1 is provided with a sliding component 16, and the tower restraint component 1 is fixed in the tower 5; the middle part of the cable 3 spans the tower restraint component 1 and is slidably connected to the tower restraint component 1 through the sliding component 16, and both ends of the cable 3 are connected to the ground, and the cable 3 can be applied with prestress.

[0028] The present invention is applied to a wind turbine tower 5, and the tower restraint component 1 is fixed inside the tower 5, and can be welded to the tower 5 or otherwise fixedly connected to the tower 5. The specific connection position of the tower restraint component 1 and the tower 5 can be determined according to actual needs. In other words, the distance between the tower restraint component 1 and the ground can be adjusted according to the actual project, thereby optimizing the stress condition of the cable 3 and meeting the relevant requirements of actual project construction. Through holes are preset on the tower 5 corresponding to the parts through which the cables 3 need to pass (not specifically shown in the figure). One end of the cable 3 is passed through one of the through holes on the tower 5, then bypasses the sliding component 16, and then passes through another corresponding through hole on the tower 5, while ensuring that the middle part of the cable 3 is slidably connected to the sliding component 16; then one end of the cable 3 is first fixedly connected to the ground and pre-stressed, and then the other end of the cable 3 is fixedly connected to the ground. Since the pre-stress is applied to the cable 3, it can ensure that each section of the cable 3 is subjected to tension, and the deflection of the cable 3 due to its own weight can be effectively reduced, so that the force on the cable 3 is uniform and stable, thereby improving the working performance of the cable 3.

[0029] The present invention is installed in the middle of the wind turbine tower 5. By constraining the middle of the wind turbine tower 5, the stability of the wind turbine tower 5 is enhanced, thereby improving the problem of self-stability failure of the wind turbine tower 5 caused by the excessive slenderness ratio of the wind turbine tower 5. The connection structure of the cable 3 and the tower constraint component 1 of the present invention enables the cable 3 to participate in energy consumption when the wind turbine tower 5 resists extreme disasters, thereby improving the ability of the wind turbine tower 5 to resist extreme natural disasters.

[0030] When the wind turbine tower 5 deviates to the left or right of the longitudinal plane where the cable 3 is located, the axial forces acting on the cable 3 are all tensile forces. When the wind turbine tower 5 displaces laterally in a certain direction, the lateral displacement can be decomposed into lateral displacement occurring within the tower restraining member 1. The middle portion of the cable 3 is in a sliding connection with the tower restraining member 1. Therefore, when the wind turbine tower 5 deviates in any direction, the axial forces acting on the cable 3 are all tensile forces. Specifically, when the wind turbine tower 5 deviates, the cable 3 slides relative to the sliding member 16. Because the cable 3 is prestressed, it is ensured that the cable 3 is always taut. Based on the above factors, it is ensured that the cable 3 and the wind turbine tower 5 bear the load together under all circumstances. In addition, the present invention can improve the stress state of the wind turbine tower 5 without significantly increasing the deadweight of the wind turbine tower 5, enhancing the stability and safety of the wind turbine tower 5, and further enabling the operation of wind turbines at higher altitudes, thereby better utilizing wind energy for power generation.

[0031] Furthermore, the tower restraint component 1 includes a cable bracket and a bearing assembly 15 for bearing the cable bracket. The bearing assembly 15 is connected to the tower 5, that is, the bearing assembly 15 serves as an intermediate piece for indirectly connecting the cable bracket and the tower 5, making the connection structure more stable. The sliding component 16 is provided on the cable bracket, and the sliding component 16 is a pulley.

[0032] The cable bracket includes multiple groups of cable support rods, and the sliding component 16 is provided at the upper end of the cable support rod. A spacing S is left between the horizontal planes where the upper ends of the multiple groups of cable support rods are located, and the spacing S is greater than the diameter of the cable 3. That is, the horizontal planes where the upper ends of the multiple groups of cable support rods are located are all staggered. In other words, the upper ends of a single group of cable support rods are located in a horizontal plane, and the horizontal planes where the upper ends of each group of cable support rods are located do not overlap. It can also be understood that the height of each group of cable support rods is not At the same time, space is reserved for each of the cables 3 to move freely; the number of the cables 3 is the same as the number of groups of the cable support rods, and multiple cables 3 correspond one-to-one to multiple groups of the cable support rods, and the multiple cables 3 are staggered so that each group of the cable support rods can independently correspond to one cable 3, and the multiple cables 3 do not contact each other, that is, the parts where the multiple cables 3 are connected to the cable support rods are spaced apart in the vertical direction to avoid contact between the multiple cables 3 that affects their performance. The presence of multiple cables 3 adds a force system to the wind turbine tower 5, improves the problem of large cross-sectional bending moment caused by the large height of the wind turbine tower 5, and can enhance the ductility and energy consumption capacity of the wind turbine tower 5, further making it less likely for the wind turbine tower 5 to undergo large brittle deformation and lose its bearing capacity under extreme disasters such as earthquakes and typhoons.

[0033] Furthermore, the cable support rods include a cable support rod A and a cable support rod B. The lower ends of the cable support rods A and B are respectively connected vertically to the bearing assembly 15, and the upper ends are provided with the sliding component 16. The cable support rods A and B are parallel to each other and have a spacing therebetween. The cable support rods A and B in the same group have the same height and are both square rod-shaped structures. The upper end of the cable support rod A is recessed downward to form a chute 13. The interior of the chute 13 is a groove cavity, which extends through the two opposite longitudinal side walls of the chute 13. The structures of the cable support rods A and B are the same. The transverse axis of the groove cavity on the cable support rod A is axis A, and the transverse axis of the groove cavity on the cable support rod B is axis B. Axis A and axis B coincide. In other words, the groove cavity on the cable support rod A and the groove cavity on the cable support rod B are oriented in the same direction. The sliding component 16 is installed in the slide groove 13, and the middle portion of the cable 3 is slidably connected to the sliding component 16 at the upper ends of the cable support rod A and the cable support rod B, respectively. After the cable 3 is installed on the cable support rod, the portion of the cable 3 located between the cable support rod A and the cable support rod B is parallel to the horizontal plane. When the wind turbine tower 5 undergoes lateral displacement in a certain direction, the lateral displacement of the wind turbine tower 5 can be decomposed into the lateral displacement occurring in the plane where the cable support rod is located. It can also be understood that the lateral displacement of the wind turbine tower 5 can be decomposed into the lateral displacement occurring in the plane where the cable 3 is located, so that the axial force acting on the cable 3 is all tensile force.

[0034] Preferably, the longitudinal planes where the cable supports of each group are located are staggered. Specifically, the cable supports A and the cable supports B of a single group are located in the same longitudinal plane, and there is an angle between the longitudinal planes where the cable supports of each group are located, that is, the longitudinal planes where the cable supports of each group are located do not overlap. Because the longitudinal planes where the cable supports of each group are located are staggered, and the distribution position of the cable supports determines the distribution direction of the cables 3, after the middle part of the cables 3 is slidably connected to the cable supports, multiple cables 3 are distributed in multiple directions, increasing the tension in multiple directions of the wind turbine tower 5, making the force on the wind turbine tower 5 more balanced. The midpoint of the distance between the cable supports A and the cable supports B of each group is located on the same longitudinal straight line.

[0035] Furthermore, the cable bracket also includes multiple auxiliary rods 14, the cable support rod A and the cable support rod B respectively correspond to one auxiliary rod 14, the auxiliary rod 14 is located on the opposite side of the cable support rod A and the cable support rod B, the upper end of the auxiliary rod 14 is connected to the middle of the cable support rod, and the lower end is connected to the bearing assembly 15. Specifically, each group of the cable bracket corresponds to two auxiliary rods 14, and the two auxiliary rods 14 correspond one-to-one to the cable support rod A and the cable support rod B, respectively. The upper end of one auxiliary rod 14 is connected to the middle of the cable support rod A, and the upper end of the other auxiliary rod 14 is connected to the middle of the cable support rod B. The auxiliary rods 14 are inclined relative to the cable support rod and the bearing assembly 15. In this embodiment, the lower ends of multiple auxiliary rods 14 are connected to the middle of the bearing assembly 15.

[0036] In this embodiment, the cable support rods are divided into two groups, namely a first group of cable support rods and a second group of cable support rods. The first group of cable support rods is higher than the second group of cable support rods. The longitudinal plane of the first group of cable support rods is perpendicular to the longitudinal plane of the second group of cable support rods. There are two cables 3. After the two cables 3 are respectively installed on the first group of cable support rods and the second group of cable support rods, the longitudinal planes of the two cables 3 are also perpendicular to each other. Specifically, the first group of cable support rods includes a first group of cable support rods A1101 and a first group of cable support rods B1102, and the second group of cable support rods includes a second group of cable support rods A1201 and a second group of cable support rods B1202.

[0037] The plurality of cable support rods and the plurality of cables 3 are provided, with the middle portions of the cables 3 being slidably connected to the cable support rods and the ends being connected to the ground. The cables 3 are arranged in such a manner that, under all circumstances, each section of the cables 3 is subjected only to tension, and that no phenomenon occurs in which some cables 3 are subjected to compression while others are relaxed. When the wind turbine tower 5 undergoes lateral displacement in a certain direction, the lateral displacement is decomposed into lateral displacement occurring in the plane of the cable support, so that the axial force acting on the cables 3 is exclusively tensile.

[0038] Furthermore, the load-bearing assembly 15 includes an annular component 1501 and a reinforcement frame 1502. The reinforcement frame 1502 is located on the inner side of the annular component 1501 and connected to its inner wall. The annular component 1501 is connected to the lower end of the cable support rod, and the reinforcement frame 1502 is connected to the lower end of the auxiliary rod 14. The annular component 1501 is connected to the tower 5.

[0039] Preferably, the bearing assembly 15 is connected to the tower 5 via a stabilizing platform 2. The cross-section of the stabilizing platform 2 is circular, and the sidewall of the stabilizing platform 2 is connected to the inner wall of the wind turbine tower 5. Furthermore, a plurality of connecting rods 4 are provided at the lower end of the stabilizing platform 2. The lower ends of the connecting rods 4 are connected to the bearing assembly 15, and the upper ends are connected to the stabilizing platform 2. Specifically, the lower ends of the connecting rods 4 are vertically connected to the annular component 1501, and the upper ends are vertically connected to the stabilizing platform 2. The stabilizing platform 2 is connected to the tower 5. In this embodiment, the stabilizing platform 2 is a columnar structure, and the tower restraint component 1 is located below the stabilizing platform 2, that is, the cable support rods and the bearing assembly 15 are both located below the stabilizing platform 2. A vertical spacing is left between the stabilizing platform 2 and the upper ends of the first group of cable support rods to facilitate the installation of the cables 3 without affecting the movement of the cables 3.

[0040] Preferably, the annular component 1501 is a square ring, and the reinforcing frame 1502 is a cross-shaped structure. The annular component 1501 includes a first ring segment, a second ring segment, a third ring segment, and a fourth ring segment. The first ring segment is parallel to the third ring segment, the second ring segment is parallel to the fourth ring segment, and the two ends of the first ring segment are perpendicularly connected to one end of the second ring segment and the fourth ring segment, respectively. The two ends of the third ring segment are perpendicularly connected to the other ends of the second ring segment and the fourth ring segment, respectively. The middle portion of the first ring segment is perpendicularly connected to the lower end of the first group of cable support rods A1101, the middle portion of the third ring segment is perpendicularly connected to the lower end of the first group of cable support rods B1102, the middle portion of the second ring segment is perpendicularly connected to the lower end of the second group of cable support rods A1201, and the middle portion of the fourth ring segment is perpendicularly connected to the lower end of the second group of cable support rods B1202.

[0041] In this embodiment, there are four connecting rods 4, and there may also be five, six, etc., which can be added or reduced as needed. The lower ends of the four connecting rods 4 are respectively connected to the four corners of the annular component 1501.

[0042] The tower restraint component 1, the connecting rod 4, and the stabilizing platform 2 described in the present invention are all made of steel, and their rigidity can reduce the vortex-induced vibration of the wind turbine tower 5. The cable bracket and the bearing assembly 15 are welded, the cable support rod and the auxiliary rod 14 are welded, and the annular component 1501 and the reinforcement frame 1502 are welded. The rigidity of each component and connection of the present invention is improved, which improves the natural frequency of the present invention, avoids it from being close to the vortex emission frequency, and avoids resonance.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A prestressed cable conversion structure for a wind turbine tower, characterized in that: include: A tower restraining component, wherein the tower restraining component is provided with a sliding component and is fixed in the tower; A cable, wherein the middle portion of the cable spans the tower restraint component and is slidably connected to the tower restraint component via the sliding component, both ends of the cable are connected to the ground, and the cable can be subjected to pre-tensioning stress.

2. A prestressed cable conversion structure for a wind turbine tower according to claim 1, characterized in that: The tower restraining component includes a cable bracket and a bearing assembly for bearing the cable bracket. The bearing assembly is connected to the tower, and the sliding component is provided on the cable bracket.

3. A prestressed cable conversion structure for a wind turbine tower according to claim 2, characterized in that: The cable bracket includes multiple groups of cable support rods, the sliding component is set at the upper end of the cable support rod, and a spacing S is left between the horizontal planes where the upper ends of the multiple groups of cable support rods are located, and the spacing S is greater than the diameter of the cable; the number of the cable is the same as the number of groups of the cable support rods, and the multiple cables correspond one-to-one to the multiple groups of cable support rods, and the multiple cables are staggered.

4. A prestressed cable conversion structure for a wind turbine tower according to claim 3, characterized in that: The cable support rod includes a cable support rod A and a cable support rod B. The lower ends of the cable support rod A and the cable support rod B are respectively vertically connected to the bearing assembly, and the sliding component is provided at the upper end. The cable support rod A and the cable support rod B are parallel to each other and have a distance between them.

5. The prestressed cable conversion structure for a wind turbine tower according to claim 4, characterized in that: The longitudinal planes where the cable supports of each group are located are all staggered.

6. The prestressed cable conversion structure for a wind turbine tower according to claim 5, characterized in that: The cable bracket also includes multiple auxiliary rods, and the cable support rod A and the cable support rod B each correspond to an auxiliary rod. The auxiliary rod is located on the opposite side of the cable support rod A and the cable support rod B. The upper end of the auxiliary rod is connected to the middle part of the cable support rod, and the lower end is connected to the bearing assembly. The auxiliary rod is inclined relative to the cable support rod and the bearing assembly.

7. A prestressed cable conversion structure for a wind turbine tower according to claim 6, characterized in that: There are two groups of cable support rods, namely a first group of cable support rods and a second group of cable support rods. The first group of cable support rods is higher than the second group of cable support rods, and the longitudinal plane of the first group of cable support rods is perpendicular to the longitudinal plane of the second group of cable support rods.

8. The prestressed cable conversion structure for a wind turbine tower according to claim 6, characterized in that: The load-bearing assembly includes an annular component and a reinforcement frame. The reinforcement frame is located on the inner side of the annular component and connected to its inner wall. The annular component is connected to the lower end of the cable support rod, and the reinforcement frame is connected to the lower end of the auxiliary rod; the annular component is connected to the tower.

9. A prestressed cable conversion structure for a wind turbine tower according to any one of claims 2 to 8, characterized in that: The bearing assembly is connected to the tower via a stabilizing platform. The cross section of the stabilizing platform is circular, and the side wall of the stabilizing platform is connected to the inner side wall of the wind power tower.

10. The prestressed cable conversion structure for a wind turbine tower according to claim 9, characterized in that: A plurality of connecting rods are provided at the lower end of the stabilizing platform. The lower ends of the connecting rods are connected to the bearing assembly, and the upper ends of the connecting rods are connected to the stabilizing platform.

Images