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Bolt connection structure of wind turbine generator, blade root structure, wind turbine blade, and wind turbine generator

A technology for wind turbines and connection structures, which is applied to the bolt connection structure of wind turbines, blade root structure, wind power blades and units, can solve the problems of easy fatigue fracture of blade bolts, difficult design life requirements, etc.

Inactive Publication Date: 2021-05-18
东方电气风电股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These cyclically fluctuating bending moments cause the blade bolts to be easily fatigued and fractured, making it difficult to meet the 20-year design life requirement

Method used

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  • Bolt connection structure of wind turbine generator, blade root structure, wind turbine blade, and wind turbine generator
  • Bolt connection structure of wind turbine generator, blade root structure, wind turbine blade, and wind turbine generator
  • Bolt connection structure of wind turbine generator, blade root structure, wind turbine blade, and wind turbine generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as Figure 1 to Figure 5 As shown, a bolted connection structure of a wind turbine includes a first bolt 1 and a second bolt 2 matched with the first bolt 1. One end of the first bolt 1 is provided with a male thread 11. On the second bolt 2 A female thread 21 that cooperates with the male thread 11 is provided, and the root fillet radius of the male thread 11 is twice or more than that of other bolts with the same bolt diameter.

[0038] The fillet radius of the bottom of the male thread 11 is twice or more than that of other bolts with the same diameter, which can effectively reduce the stress concentration at the bottom of the thread, thereby significantly improving the fatigue resistance. The range of fatigue stress that the first bolt 1 can bear increases, and it can bear a large fatigue load that fluctuates periodically for a long time. Thereby improving the fatigue life of the bolt.

[0039] It is worth noting that the specific connection structure of the ...

Embodiment 2

[0049] Such as Figure 1 to Figure 5 As shown, as a further optimization of Embodiment 1, this embodiment includes all the technical features of Embodiment 1. In addition, this embodiment also includes the following technical features:

[0050] A wind turbine blade root structure includes the above-mentioned wind turbine bolt connection structure.

[0051] As a preferred technical solution, the second bolt 2 is arranged at the root of the blade of the wind turbine.

[0052] This is beneficial to the fixed installation of the blade root of the wind turbine, which is convenient for use.

[0053] A wind turbine blade of a wind turbine comprises the above-mentioned bolt connection structure of the wind turbine.

[0054] As a preferred technical solution, the second bolt 2 is arranged at the root of the blade of the wind turbine.

[0055] A wind turbine, comprising a bolt connection structure of the wind turbine.

[0056] As a preferred technical solution, the second bolt 2 is ...

Embodiment 3

[0058] Such as Figure 1 to Figure 5As shown, a bolted connection structure of a wind turbine, the first bolt 1 on the blade 3 adopts a larger thread bottom fillet, which can improve the stress concentration of the thread bottom. Only 0.125P (P is the pitch), taking a bolt with a nominal diameter of 36mm as an example, the root fillet radius of the ordinary threaded bolt is 0.5, while the radius of the top and bottom fillet of the first bolt 1 external thread can reach 1.5 mm, which is three times the fillet radius of the common thread bottom. If the fillet radius of the tooth bottom is large, the stress concentration at the thread part is small, so the stress at the first bolt 1 is small. At the same time, due to the increase of the fillet radius of the bottom of the tooth, the corresponding small diameter of the thread increases, and the load that the first bolt 1 can bear increases. Under the same load, the stress of the first bolt 1 is smaller, so that the first bolt 1 can...

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Abstract

The invention discloses a bolt connection structure of a wind turbine generator. The bolt connection structure of the wind turbine generator comprises a first bolt and a second bolt matched with the first bolt, wherein a male thread is arranged at one end of the first bolt, a female thread matched with the male thread is arranged on the second bolt, and the root fillet radius of the male thread is twice or more than twice that of other bolts with the same bolt diameter. The invention further discloses a blade root structure comprising the bolt connection structure, a wind turbine blade, and the wind turbine generator. According to the invention, the defects that in the prior art, a bolt is low in bearable fatigue stress amplitude and difficult to bear large fatigue loads with long-time periodic fluctuation are overcome.

Description

technical field [0001] The invention relates to the technical field of wind turbine installation, in particular to a wind turbine bolt connection structure, a blade root structure, a wind turbine blade and a wind turbine unit. Background technique [0002] Bolt connection is widely used in the connection of various structures. The commonly used bolts are metric thread bolts. The thread of the thread presents a zigzag triangle, the radius of the bottom of the thread is small, the stress concentration is large, and the fatigue stress range that the bolt can withstand is small. It is difficult to withstand large fatigue loads with long-term periodic fluctuations. [0003] All key components on the wind turbine are connected to each other by bolts. As the power level of the wind turbine increases, the size of the wind turbine also increases. The size of the unit design is mainly limited by the strength of the bolt connection, especially the connection bolts between the blade an...

Claims

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Application Information

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IPC IPC(8): F03D1/06F03D13/10F03D80/00
CPCF03D1/0658F03D13/10F03D80/00Y02E10/72
Inventor 廖晖王其君赵伟龚学进杨静洪超张灿曾宇阳小林唐林邓智春张亚光
Owner 东方电气风电股份有限公司
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