阅读说明：本技术 一种风电机组塔筒及其加工方法 (Wind turbine generator tower and processing method thereof ) 是由 周昳鸣 郭小江 王茂华 刘鑫 闫姝 施建冲 顾小兵 张艳飞 张宝君 陆启芹 李钊 于 2021-03-08 设计创作，主要内容包括：本发明提供一种风电机组塔筒及其加工方法,风电机组塔筒,筒壁内侧面上设置有相互交叉的第一加筋和第二加筋；第一加筋和第二加筋形成网状结构；根据设计尺寸切割钢板；在所述钢板上焊接横向加筋和斜向加筋,焊脚处做凸形或凹形角焊缝处理；将焊完加筋后的钢板卷制成圆筒,并释放焊接应力和变形应力采用本发明的风电机组塔筒,可以改善塔架的屈曲力学特性,在满足屈曲强度的前提下减小塔架重量,从而达到减小塔底载荷,为整个支撑结构减重的目的,此外,通过本发明提出的一种风电机组塔筒加筋结构,还可以有效减小塔架在横卧放置阶段的变形。(The invention provides a wind turbine tower and a processing method thereof.A first reinforcement rib and a second reinforcement rib which are mutually crossed are arranged on the inner side surface of the wall of the wind turbine tower; the first reinforcement and the second reinforcement form a net structure; cutting the steel plate according to the design size; welding transverse reinforcement and oblique reinforcement on the steel plate, and performing convex or concave fillet weld treatment at a weld leg; the wind turbine tower barrel is adopted to improve the buckling mechanical property of the tower and reduce the weight of the tower on the premise of meeting the buckling strength, so that the purposes of reducing the load at the bottom of the tower and reducing the weight of the whole supporting structure are achieved.)

1. A tower barrel of a wind turbine generator is characterized in that a first reinforcement rib (2) and a second reinforcement rib (3) which are mutually crossed are arranged on the inner side surface of a barrel wall (1); the first reinforcement (2) and the second reinforcement (3) form a net structure.

2. The wind turbine tower of claim 1, wherein the first stiffener (2) is parallel to the tower axis and the second stiffener (3) is perpendicular to the tower axis.

3. The wind turbine tower as claimed in claim 2, wherein the wall thickness t, the first ribs (2) are parallel to the tower axis, and the width f, the height h, the spacing l between two adjacent first ribs (2), and the spacing w between two adjacent second ribs (3) of the second ribs (3) satisfy:

find:f,h,t,l,w

minimize:mass_tower

subject to:SRF_buckling≥1

f,h,t,l,w＞0

wherein mass _ tower is the mass of the tower, and SRF _ buckling is the safety margin of the buckling strength.

4. The wind turbine tower as claimed in claim 1, wherein the first and second ribs (2, 3) each have an angle with the axis of the tower, and a third rib (4) intersecting the first and second ribs (2, 3) is further provided on the inner side of the wall of the tower, and the angle between the first and second ribs (2, 3) is α.

5. The wind turbine tower of claim 4, wherein the third stiffener (4) is transverse, the third stiffener (4) being perpendicular to the tower axis; the third rib (4) intersects the edges of a series of parallelograms formed by the first (2) and second (3) ribs.

6. The tower of claim 5, wherein the wall thickness t, the width f of the first rib (2) and the second rib (3), the width e of the third rib (4), the distance b between the transverse intersection points of the first rib (2) and the second rib (3), the distance a between the longitudinal vertexes of a series of parallelograms formed by the first rib (2) and the second rib (3), the distance c between two adjacent third ribs (4), and the height h of the first rib (2), the second rib (3) and the third rib (4) satisfy the following requirements:

find:a,b,c,e,f,α,h,t

minimize:mass_tower

subject to:SRF_buckling≥1

a,f,b,c,e,h,t＞0

wherein mass _ tower is the mass of the tower, and SRF _ buckling is the safety margin of the buckling strength.

7. The wind turbine tower of claim 4, wherein the third stiffener (4) is longitudinal, the third stiffener (4) being parallel to the tower axis; the third rib (4) intersects the intersection of the first rib (2) and the second rib (3).

8. The wind turbine tower as claimed in claim 7, wherein the wall thickness t, the width f of the first rib (2) and the second rib (3), the width e of the third rib (4), the distance a between the longitudinal vertexes of a series of parallelograms formed by the first rib (2) and the second rib (3), the included angle β between the first rib (2) and the third rib (4) and the second rib (3), the distance c between two adjacent third ribs (4), and the height h of the first rib (2), the second rib (3) and the third rib (4) satisfy the following requirements:

find:a,c,e,f,β,h,t

minimize:mass_tower

subject to:SRF_buckling≥1

a,f,b,c,e,h,t＞0

wherein mass _ tower is the mass of the tower, and SRF _ buckling is the safety margin of the buckling strength.

9. A wind turbine generator system, characterized in that a wind turbine generator system tower as claimed in any one of claims 1 to 7 is used.

10. The processing method of the tower barrel of the wind turbine generator set as claimed in any one of claims 1 to 7, characterized by comprising the following steps:

cutting the steel plate according to the design size;

welding a transverse reinforcement (2) and an oblique reinforcement (3) on the steel plate, and performing convex or concave fillet weld treatment at a weld leg;

and (4) rolling the steel plate welded with the reinforcement into a cylinder, and releasing welding stress and deformation stress.

Technical Field

The invention belongs to the technical field of wind power generation steel tower design, and particularly relates to a wind turbine generator tower and a machining method thereof.

Background

Along with the capacity of the wind turbine generator and the normal diameter of the blades, the diameter and the height of the wind turbine tower are increased, and the forming process and the structural details are more and more complicated. The weight of the wind power tower is generally about 200-500 tons according to the actual project situation, and accounts for about 5% of the total cost of the wind power unit. Because the current domestic policy has requirements on wind power flat-price internet surfing, higher requirements are provided for the fineness of the optimized design of the tower structure and the research on a novel light structure.

The structural form of the optical cylinder shell is generally adopted in the design of the cylinder shell structure, and then the optical cylinder shell is found to be very sensitive to initial defects in practical application, so that the bearing capacity of the structure is greatly reduced, and the actual bearing requirement is difficult to meet. In the technical development of space launch vehicles, in order to improve the bearing capacity and the defect resistance of a barrel shell structure, designers propose a reinforced barrel shell structure form which is composed of a skin and ribs, wherein the rib structure effectively improves the bending rigidity of the barrel shell structure, and further improves the bearing capacity and the defect resistance of the barrel shell structure. The reinforced thin shell in the rocket body structure is made of aluminum alloy materials generally by adopting a chemical milling or mechanical milling mode. With the rise of composite materials, the key sections of the rocket bodies in foreign countries adopt composite material reinforced thin shell structures.

The reinforced cylinder shell structure is not widely used in the industrial design and manufacture of the wind power tower. The failure mode of the aerospace rocket body structure generally only needs to consider ultimate strength and buckling strength, and the failure mode of the wind power tower is divided into the ultimate strength, the buckling strength and the fatigue strength. For onshore wind turbine towers with hub height within 100m, the wind turbine towers with water depth within 20m and hub height within 90m are usually controlled by buckling strength.

In tower design, the buckling strength is generally determined by the wall thickness of the tower, after tower sections, diameters, materials and machining processes are determined. The wall thickness of the tower directly affects the amount of load at the tower bottom and the weight of the tower, thus affecting the engineering load of the basic design. Especially for offshore wind turbine supporting structures, the cost of the foundation is generally more than 5 times of that of the tower. Therefore, it is necessary to reduce the tower bottom load by optimizing the tower wall thickness and weight to make the entire support structure more cost effective.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a wind turbine tower and a processing method thereof, and a reinforced structure is designed for a fan tower structure controlled by buckling strength, so that the weight of the tower is reduced on the premise of meeting the buckling strength, and the purposes of reducing the load at the bottom of the tower and reducing the weight of the whole supporting structure are achieved.

In order to achieve the purpose, the technical scheme adopted by the invention is that a first reinforcement rib and a second reinforcement rib which are mutually crossed are arranged on the inner side surface of the cylinder wall of the wind turbine generator tower; the first reinforcement and the second reinforcement form a mesh structure.

The first reinforcement is parallel to the axis of the tower, and the second reinforcement is perpendicular to the axis of the tower.

Wall thickness t, first muscle that adds is on a parallel with tower section of thick bamboo axis, and the width f that the second adds the muscle, height h, the interval l that two adjacent first muscle that add and the interval w that two adjacent second add the muscle satisfy:

find:f,h,t,l,w

minimize:mass_tower

subject to:SRF_buckling≥1

f,h,t,l,w＞0

wherein mass _ tower is the mass of the tower, and SRF _ buckling is the safety margin of the buckling strength.

The first reinforcement and the second reinforcement have included angles with the axis of the tower barrel, the inner side face of the barrel wall is further provided with a third reinforcement which is crossed with the first reinforcement and the second reinforcement, and the included angle between the first reinforcement and the second reinforcement is alpha.

The third reinforcement is transverse and is vertical to the axis of the tower; the third rib intersects the edges of the series of parallelograms formed by the first and second ribs.

Wall thickness t, first add muscle and second and add the width f, the width e that the third reinforced, first add the muscle and the horizontal nodical distance b of second reinforcement, the first distance a that adds the vertical summit of a series of parallelograms that forms with the second reinforcement, the interval c that two adjacent third reinforced and the height h that first muscle, second reinforced and third reinforced satisfy:

find:a b,c,e,f,α,h,t

minimize:mass_tower

subject to:SRF_buckling≥1

a,f,b,c,e,h,t＞0

wherein mass _ tower is the mass of the tower, and SRF _ buckling is the safety margin of the buckling strength.

The third reinforcement is longitudinal, and is parallel to the axis of the tower; the third rib intersects an intersection of the first rib and the second rib.

Wall thickness t, the width f that first muscle and second add muscle, the width e that the third adds the muscle, first muscle and the second add the distance a that forms a series of parallelogram vertical summits that muscle, first muscle and second add the contained angle beta that muscle and third add the muscle, the interval c that two adjacent third add the muscle and the height h that first muscle, second add the muscle and the third adds the muscle satisfies:

find:a,c,e,f,β,h,t

minimize:mass_tower

subject to:SRF_buckling≥1

a,f,b,c,e,h,t＞0

wherein mass _ tower is the mass of the tower, and SRF _ buckling is the safety margin of the buckling strength.

A wind generating set adopts the tower barrel of the wind generating set.

The processing method of the tower barrel of the wind turbine generator set specifically comprises the following steps:

cutting the steel plate according to the design size;

welding transverse reinforcement and oblique reinforcement on the steel plate, and performing convex or concave fillet weld treatment at weld leg positions

And (4) rolling the steel plate welded with the reinforcement into a cylinder, and releasing welding stress and deformation stress.

Compared with the prior art, the invention has at least the following beneficial effects:

by adopting the wind turbine tower drum reinforced structure, the buckling mechanical property of the tower can be improved, and the weight of the tower is reduced on the premise of meeting the buckling strength, so that the purposes of reducing the load at the bottom of the tower and reducing the weight of the whole supporting structure are achieved. In addition, the Kagome reinforcement structure for the tower of the wind turbine generator system, provided by the invention, can effectively reduce the deformation of the tower in the horizontal placement stage.

Drawings

FIG. 1 is a schematic diagram of a Kagome reinforcement structure of a wind power tower.

FIG. 2 is a schematic view of a Kagome reinforcement structure after a wind power tower is unfolded.

FIG. 3 is a schematic diagram of a single cell structure after being unfolded in a reinforcement structure according to an embodiment.

FIG. 4a is a schematic side view of a unit cell structure after being unfolded in a reinforced structure according to an embodiment.

FIG. 4b is a schematic top view of the expanded unit cell structure of the reinforcement structure according to the embodiment.

FIG. 5 is a schematic view of a cylinder wall of an orthogonal reinforcement structure of a wind power tower.

FIG. 6 is an expanded schematic view of an orthogonal reinforcement structure of a wind power tower.

FIG. 7 is a schematic diagram of a single-cell three-dimensional structure of a wind power tower after an orthogonal reinforcement structure is unfolded.

FIG. 8a is a schematic side view of a unit cell structure of a wind power tower after an orthogonal reinforcement structure is unfolded.

FIG. 8b is a schematic top view of a unit cell structure of a wind power tower after an orthogonal reinforcement structure is unfolded.

FIG. 9 is a schematic view of a triangular reinforcement structure of a wind power tower

FIG. 10 is a schematic view of a triangular reinforcement unfolding structure of a wind power tower

FIG. 11 is a schematic diagram of a single-cell unfolding three-dimensional structure of a triangular reinforcement structure of a wind power tower.

FIG. 12a is a schematic side view of a unit cell unfolding structure of a triangular reinforcement structure of a wind power tower.

FIG. 12b is a schematic plan view of a single-cell unfolding structure of a triangular reinforcement structure of a wind power tower.

Detailed Description

The present invention is described in detail below with reference to the attached drawing figures, in which exemplary embodiments of the invention are shown.

The method mainly comprises a Kagome, orthogonal and triangular hierarchical reinforcement structure.

In embodiment 1, fig. 1 to 4a and 4b show a Kagome reinforcement structure for a tower of a wind turbine generator system, a first reinforcement and a second reinforcement are arranged on an inner wall of a wind turbine tower, an included angle between the first reinforcement and the second reinforcement is α, and α is preferably 60 °.

Referring to fig. 2, the Kagome reinforcement structure for the tower of the wind turbine generator system according to the embodiment may be obtained by periodically arranging a single cell in a plane, where the wall thickness of the tower in the single cell is t, the length of the single cell (a dotted line frame is a single cell) is a, and the length of the single cell may also be understood as a distance a between longitudinal vertexes of a series of parallelograms formed by the first reinforcement 2 and the second reinforcement 3; the width is b, as shown in fig. 3, in the Kagome reinforcement structure for the tower of the wind turbine generator system, the cross section of the first reinforcement is: the width f is that the distance between two adjacent third reinforced ribs 4 is c; the cross-sectional dimension of the second reinforcement is: a width f; the heights of the first reinforcement, the second reinforcement and the third reinforcement 4 are all h; the width of the third rib 4 is e;

and for the parameters such as the size distance of the first reinforcement and the second reinforcement, customized design can be carried out according to the actual project conditions.

When the Kagome reinforcement structure for the tower drum of the wind turbine generator system is adopted, the optimal reinforcement structure design can be obtained by the following optimization formula for specific problems:

find:a,b,c,e,f,α,h,t

minimize:mass_tower

subject to:SRF_buckling≥1

a,f,b,c,e,h,t＞0

wherein mass _ tower is the mass of the tower, and SRF _ buckling is the safety margin of the buckling strength.

In the case of the example 2, the following examples are given,

fig. 5-8 show a reinforcement structure for orthogonal wind turbine tower barrels, in fig. 5, the reinforcement structure for orthogonal wind turbine tower barrels has a first reinforcement rib and a second reinforcement rib on the inner wall of a wind turbine tower, and the angle formed between the first reinforcement rib and the second reinforcement rib is 90 °.

As shown in fig. 6, 7, 8a and 8b, with the orthogonal reinforcement structure for a tower of a wind turbine generator according to the embodiment, in the cross-sectional dimensions of the second reinforcement: the width f is w, and the distance between two adjacent second ribs 3 is w; the cross-sectional dimension of the first reinforcement is: the width is f, and the distance between two adjacent first reinforced ribs is l; the orthogonal reinforcement structure for the tower of the wind turbine generator system can be obtained periodically in a plane by a single cell, the heights of longitudinal reinforcement and transverse reinforcement in the single cell are both h, and the wall thickness of the tower is t.

When the orthogonal reinforcement structure for the tower barrel of the wind turbine generator system is adopted, the optimal reinforcement structure design can be obtained by the following optimization formula for specific problems:

find:f,w,l,h,t

minimize:mass_tower

subject to:SRF_buckling≥1

f,w,l,h,t＞0

wherein mass _ tower is the mass of the tower, and SRF _ buckling is the safety margin of the buckling strength.

By adopting the orthogonal reinforcement structure for the tower barrel of the wind generating set, the wind generating set can be designed in a customized manner according to the actual project conditions and the size parameters such as the size interval of the first reinforcement 2 and the second reinforcement 3.

Optionally, in the orthogonal rib adding structure for the tower barrel of the wind turbine generator system, an included angle is formed between the first rib and the horizontal plane, and the second rib 3 is perpendicular to the first rib 2.

Example 3

Referring to fig. 9, 10, 11, 12a and 12b, in the wind turbine tower inner side surface reinforcement structure shown in fig. 9, the inner wall of a wind turbine tower 1 is provided with a first reinforcement 2 and a second reinforcement 3, and the range of an included angle α between the first reinforcement and the second reinforcement is (0 ° and 90 °).

The wind turbine tower drum reinforcement structure of the embodiment can be obtained by periodically arranging a single cell in a plane, wherein: the wall thickness of the tower barrel is t, and the heights of the first reinforcement, the second reinforcement and the third reinforcement are all h;

in the wind turbine tower cylinder reinforcement structure described in this embodiment, the cross section of the third reinforcement 4 is: the width e is that the distance between two adjacent third reinforced ribs 4 is c; the cross section widths of the first reinforcement rib 2 and the second reinforcement rib 3 are f, the included angles between the first reinforcement rib 2 and the third reinforcement rib 3 and the third reinforcement rib 4 are beta, and the minimum distance a between the same third reinforcement rib and the longitudinal intersection point of the first reinforcement rib and the second reinforcement rib is a minimum distance a; it can also be understood as the distance a of the longitudinal vertices of a series of parallelograms formed by the first and second reinforcement 2, 3.

When the triangular reinforcement structure for the tower cylinder of the wind turbine generator set is adopted, the optimal structural design of the reinforcing rib can be obtained through the following optimization column for specific problems:

find:a,c,e,f,β,h,t

minimize:mass_tower

subject to:SRF_buckling≥1

a,f,b,c,e,h,t＞0

wherein mass _ tower is the mass of the tower, and SRF _ buckling is the safety margin of the buckling strength.

By adopting the triangular reinforcement structure for the tower cylinder of the wind generating set, the wind generating set can be designed in a customized manner according to actual project conditions and size parameters such as size intervals of the longitudinal reinforcement 2 and the oblique reinforcement 3.

By adopting the triangular reinforcement structure for the tower of the wind turbine generator system, the wind turbine generator system can rotate 90 degrees for the single cell 4 according to actual project conditions.

By adopting the triangular reinforcement structure for the tower cylinder of the wind turbine generator system, the reinforcement thin shell structure is very sensitive to the processing characteristics such as geometric defects, geometric tolerances and the like, and in order to ensure the actual bearing performance of the structure, the processing precision of the reinforcement thin shell needs to be improved to be within 0.5 mm.

In the manufacturing process, the composite material can be manufactured by welding, chemical milling, mechanical milling or 3D printing and the like, and is determined according to the maturity of the process and the manufacturing cost.

Based on the specific structure of the embodiments 1 to 3, the cross sections of the first reinforcement 2 and the second reinforcement 3 may also be trapezoidal, and both ends of the upper bottom of the trapezoid are subjected to chamfer transition.

The manufacturing steps are as follows:

1) cutting the steel plate base material according to the design size in a tower factory

2) Welding a first reinforcement 2 and a second reinforcement 3 on a base material, wherein a fillet welding part can be processed by a convex or concave fillet welding;

3) rolling the steel plate welded with the reinforced rib into a cylinder

By adopting the wind turbine generator tower tube reinforced structure, the buckling mechanical property of the tower can be improved, and the weight of the tower is reduced on the premise of meeting the buckling strength, so that the purposes of reducing the load at the bottom of the tower and reducing the weight of the whole supporting structure are achieved.

In addition, the wind turbine tower cylinder reinforcement structure provided by the invention can effectively reduce the deformation of the tower in the horizontal placement stage.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.