阅读说明：本技术 一种风电机组塔架门洞局部加筋结构、塔架及加工方法 (Local reinforcement structure for wind turbine generator tower door opening, tower and processing method ) 是由 周昳鸣 王茂华 郭小江 李卫东 刘鑫 闫姝 张波 曾崇济 郑枫 李华 于 2021-03-08 设计创作，主要内容包括：本发明公一种风电机组塔架门洞局部加筋结构、塔架及加工方法,在门洞周围的塔筒内壁,以门洞为中心,布置n根横向加强筋和m根纵向加强筋,加紧结构覆盖的面积为2a-1·2b-1a-0是门洞宽度的一半,b-0是门洞高度的一半,a-1＞a-0,b-1＞b-0；对于本发明所述风电机组塔架门洞局部加筋结构的加工,首先将所述加筋结构与钢板焊接,并释放焊接应力后,再卷制塔筒,卷制之后再次释放变形应力,或在塔筒卷制完成并开设门洞后,焊接加筋结构,加筋结构焊接完成后释放焊接应力能够在现有工艺水平下既满足门洞附近疲劳强度,又能够减小塔架壁厚并减轻塔架质量的局部加筋结构,有效降低风电机组的建设成本。(The invention discloses a wind turbine generator tower door opening local reinforcement structure, a tower and a processing method, wherein n transverse reinforcing ribs and m longitudinal reinforcing ribs are arranged on the inner wall of a tower barrel around a door opening by taking the door opening as a center, and the area covered by a tightening structure is 2a 1 ·2b 1 a 0 Is half the width of the door opening, b 0 Is half the height of the door opening, a 1 ＞a 0 ，b 1 ＞b 0 (ii) a For the processing of the local reinforced structure of the wind turbine generator tower door opening, the reinforced structure is firstly welded with the steel plate, after the welding stress is released, the tower barrel is coiled, the deformation stress is released again after the coiling, or after the tower barrel is coiled and the door opening is formed, the reinforced structure is welded, and after the welding of the reinforced structure is completed, the welding stress is released, so that the fatigue strength near the door opening can be met, the wall thickness of the tower can be reduced, and the quality of the tower can be reduced under the existing process levelThe structure effectively reduces the construction cost of the wind turbine generator.)

1. The utility model provides a wind turbine generator system pylon door opening local reinforcement structure, its characterized in that, at the tower section of thick bamboo inner wall around door opening (2), with the door opening as the center, arrange n horizontal strengthening rib (31) and m vertical strengthening rib (32), the area that the structure of step-up covered is 2a₁·2b₁a₀Is half the width of the door opening, b₀Is half the height of the door opening, a₁＞a₀，b₁＞b₀。

2. The local reinforcement structure of the wind turbine tower door opening according to claim 1, wherein the cross sections of the transverse reinforcing ribs (31) and the longitudinal reinforcing ribs (32) are rectangular, trapezoidal, semicircular or semi-elliptical.

3. The local reinforcement structure of the wind turbine tower door opening according to claim 2, wherein when the cross sections of the transverse reinforcing ribs (31) and the longitudinal reinforcing ribs (32) are rectangular, the length is L, and the width of the transverse reinforcing ribs (31) is t₁Width of longitudinal ribs (32)t₂The width and distribution parameters of the transverse reinforcing ribs (31) and the longitudinal reinforcing ribs (32) meet the following requirements:

4. the local reinforcement structure for the wind turbine generator tower door opening according to claim 1, wherein a transverse angle alpha between the transverse reinforcing ribs (31) and the wind turbine generator tower is smaller than 90 degrees, a longitudinal angle beta between the longitudinal reinforcing ribs (32) and the wind turbine generator tower is smaller than 90 degrees, and an included angle between the transverse reinforcing ribs (31) and the longitudinal reinforcing ribs (32) is not larger than 90 degrees.

5. The local reinforcement structure of the wind turbine tower door opening according to claim 1, wherein the transverse reinforcing ribs (31) and the longitudinal reinforcing ribs (32) are integrally formed with the steel plate at the door opening.

6. The local reinforcement structure for the door opening of the wind turbine generator tower frame as claimed in claim 1, wherein the transverse reinforcing ribs (31) and the longitudinal reinforcing ribs (32) are welded to the inner wall of the tower.

7. The local reinforcement structure of the wind turbine tower door opening according to claim 1, wherein a circle of reinforcing ribs are arranged at the edge of the door opening, the reinforcing ribs are connected with the transverse reinforcing ribs (31) and the longitudinal reinforcing ribs (32), and the cross sections of the reinforcing ribs are the same as the cross sections of the transverse reinforcing ribs (31).

8. A wind turbine generator tower is characterized in that the inner wall of the tower is provided with the local reinforcement structure of the tower door opening according to any one of claims 1-7.

9. The method of manufacturing a tower for a wind turbine according to claim 8, wherein the stiffened structure is welded to a steel plate, the welding stress is released, the tower is rolled, the deformation stress is released again after rolling,

or after the tower drum is rolled and provided with the door opening, welding the reinforcement structure, and releasing the welding stress after the reinforcement structure is welded.

10. A wind power plant characterised in that a wind power plant tower according to claim 8 is used.

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 door opening local reinforcement structure, a tower and a machining method.

Background

The door opening at the bottom of the tower of the wind generating set is a main passage for operation and maintenance personnel and electrical equipment in the tower to enter and exit the fan (refer to fig. 1). Local stress increases occur near the door opening. Stress concentration tends to cause fatigue cracking of the steel material, thereby causing failure of the entire tower structure.

Therefore, it is a common practice in the wind power industry to thicken the wall thickness of the main body of the tower bottom section where the door opening is located, so as to meet the requirement of fatigue strength. However, the height of the wind power tower door opening is high, and the diameter of the bottom section is large, so that the tower quality of the bottom section is improved sharply by increasing the wall thickness, and the cost is increased. For example: taking a 6MW unit as an example, the height of a door opening at the bottom section is about 5m, the height of a tower at the bottom section is 10m, and the diameter is 7 m. As shown in Table 1, if the bottom tower section is not provided with the door opening, the wall thickness of the tower is 20mm, and the mass of the bottom tower section is 24.10 t; if the bottom section is provided with the door opening, the wall thickness of the tower frame needs to be thickened to 50mm, the mass of the tower frame at the bottom section is 59.99t, and 35.89t is increased compared with the case that the bottom section is not provided with the door opening.

TABLE 1

When designing the bottom tower frame where the wind turbine generator door opening is located, one method is to optimize the shape of the door opening as much as possible and reduce the stress concentration coefficient so as to achieve the purpose of reducing the tower frame weight. Because the shape of the door opening is generally in a standardized design, if a novel design is adopted, the process cost can be increased, the manufacturing cost of the tower with unit weight is increased, and finally the purpose of reducing the cost cannot be really achieved.

Disclosure of Invention

In order to solve the problems, the invention provides a local reinforcement structure for a door opening of a wind turbine generator tower, which can meet the fatigue strength near the door opening, reduce the wall thickness of the tower and reduce the weight of the tower under the existing process level.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a wind turbine generator system pylon door opening local adds muscle structure, the tower section of thick bamboo inner wall around the door opening to the door opening is the center, arranges n horizontal strengthening ribs and m vertical strengthening ribs, and the area that the structure covered of step-up is 2a₁·2b₁ a₀Is half the width of the door opening, b₀Is half the height of the door opening, a₁＞a₀，b₁＞b₀。

The cross sections of the transverse reinforcing ribs and the longitudinal reinforcing ribs are rectangular, trapezoidal, semicircular or semi-elliptical.

When the cross sections of the transverse reinforcing ribs and the longitudinal reinforcing ribs are rectangular, the length is L, and the width of the transverse reinforcing ribs is t₁Width t of longitudinal reinforcing rib₂The width and distribution parameters of the transverse reinforcing ribs and the longitudinal reinforcing ribs meet the following requirements:

the transverse angle alpha between the transverse reinforcing rib and the wind turbine tower is smaller than 90 degrees, the longitudinal angle beta between the longitudinal reinforcing rib and the wind turbine tower is smaller than 90 degrees, and the included angle between the transverse reinforcing rib and the longitudinal reinforcing rib is not larger than 90 degrees.

The transverse reinforcing ribs, the longitudinal reinforcing ribs and the steel plate at the door opening are integrally formed.

The transverse reinforcing ribs and the longitudinal reinforcing ribs are welded and connected with the inner wall of the tower barrel.

The door opening edge sets up a week strengthening rib, horizontal strengthening rib and vertical strengthening rib are connected to the strengthening rib, the cross section of strengthening rib is the same with horizontal strengthening rib cross section.

The invention relates to a wind turbine generator tower, wherein a local reinforcement structure of a tower door opening is arranged on the inner wall of the tower.

The processing method of the wind turbine tower frame comprises the steps of firstly welding the reinforced structure with the steel plate, releasing welding stress, then rolling the tower cylinder, releasing deformation stress again after rolling,

or after the tower drum is rolled and provided with the door opening, welding the reinforcement structure, and releasing the welding stress after the reinforcement structure is welded.

A wind generating set adopts the wind generating set tower frame.

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

the invention strengthens the local range of the door opening to reduce the stress concentration coefficient, can meet the fatigue strength near the door opening under the existing process level, can reduce the wall thickness of the tower and lighten the local reinforcement structure of the tower quality, and effectively reduces the overall construction cost of the wind turbine generator.

Drawings

The above and other features and advantages of the present invention will become more apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a local reinforcement structure of a wind turbine tower door opening.

FIG. 2 is a reinforced dimension diagram of a wind turbine tower door opening layout.

Fig. 3 is a reinforcing rib dimension chart.

1-tower cylinder, 2-door opening, 3-reinforcing rib, 31-transverse reinforcing rib and 32-longitudinal reinforcing rib.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

A tower door opening local reinforcement structure of a wind generating set is disclosed, referring to fig. 1 and fig. 2, a door opening 2 is formed in a tower barrel 1 of a tower of the wind generating set, reinforcing ribs 3 are arranged on the inner wall of the tower barrel 1 around the door opening 2, and the reinforcing ribs 3 comprise transverse reinforcing ribs 31 and longitudinal reinforcing ribs 32.

Referring to fig. 2, the range of arranging the reinforcing beads is: a in x and-x directions from the center O of the door opening on the inner wall of the tower barrel₁M longitudinal reinforcing ribs 32 are uniformly arranged within the range of (1), and b in the y and-y directions from the center O of the door opening on the inner wall of the tower barrel is₁N transverse reinforcing ribs 31 are uniformly arranged within the range of (1); the cross section size of the reinforcing rib 3 is as follows: length L, height h and width t; the width t when the rib 3 is the transverse rib 31₁And a width t in the case of the longitudinal bead 32₂. The width and distribution parameters of the reinforcing ribs 3 meet the following requirements:

wherein, t₁To representWidth of transverse ribs 31, b₂Indicates the pitch, t, of the transverse ribs 31₂Indicates the width, a, of the longitudinal ribs 32₂Indicates the pitch, a, of the longitudinal ribs 32₀Indicates the width of the door opening, b₀Indicating the door opening height.

Referring to fig. 2, when the local reinforcing structure for the wind turbine tower door opening is adopted, the angle α between the transverse reinforcing rib 31 and the x axis is not limited to 0 °, the angle β between the longitudinal reinforcing rib 32 and the-y axis is not limited to 0 °, and the included angle between the transverse reinforcing rib 31 and the longitudinal reinforcing rib 32 is not limited to 90 °.

When the local reinforcing structure of the wind turbine generator tower frame door opening is adopted, the optimal reinforcing rib structure design can be obtained through the following optimization lines for specific problems:

find:a₁,b₁,a₂,b₂,t₁,t₂,h,m,n,α,β

minimize:SCF

subject to:m·t₂+(m-1)·a₂＝2a₁

n·t₁+(n-1)·b₂＝2b₁

a₁＞a₀

b₁＞b₀

L≤2b₁≤2a₁

α≥0°

β≥0°

wherein SCF represents the stress concentration factor.

The invention provides a local reinforcement structure which can meet the fatigue strength near a door opening, reduce the wall thickness of a tower and reduce the weight of the tower under the existing process level, and the local reinforcement structure of a fan tower is applied to an embodiment of a tower with the diameter of 7m at the tower bottom, wherein the height 2b of the door opening is 2b₀4.0m, door opening width 2a₀＝1.8m，2a₁＝3.8m，2b₀＝6.0m，t₁＝t₂H is 0.03m, n is 10, α is 0 °.

Table 2 not only satisfies the fatigue strength near the door opening, but also reduces the tower wall thickness and reduces the tower mass without significantly increasing the process complexity.

TABLE 2

Based on the calculation results shown in table 2, the weight of each fan bottom tower section can be reduced by 17.91t, and the reduction amplitude is 29.9%. According to the method, 50 wind power generators are arranged in a wind field, and the price per ton of steel plates is estimated to be 1.4 ten thousand yuan, so that 1253.7 ten thousand yuan can be saved. Namely, on the basis of not considering the cost of the reinforced material, the tower door opening local reinforced structure can reduce the manufacturing cost by about 1253.7 ten thousand yuan.

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 scope of the present invention as defined by the following claims.