CN212429480U

CN212429480U - Double-round nut for wind power blade

Info

Publication number: CN212429480U
Application number: CN202021112873.9U
Authority: CN
Inventors: 奚凯凯; 李晨晖; 王永洁
Original assignee: Shanghai Shenguang High Strength Bolts Co ltd
Current assignee: Shanghai Shenguang High Strength Bolts Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-01-29
Anticipated expiration: 2030-06-16

Abstract

The utility model provides a two round nut for wind-powered electricity generation blade, it including: a first column and a second column. The outer peripheral surface of the first column body is provided with a first cylindrical surface and a first plane, the first plane is parallel to the axis of the first column body, and the first plane is provided with a threaded hole. The outer peripheral surface of the second cylinder body is provided with a second cylindrical surface and a second plane, the second plane is parallel to the axis of the second cylinder body, the second plane is provided with a circular through hole, the first plane is opposite to the second plane, the threaded hole and the circular through hole are coaxially arranged, and the diameter of the circular through hole is larger than that of the threaded hole. Through combining first cylinder and second cylinder, increased the area of contact of two round nuts with the blade root, strengthened the joint strength between nut and the blade, avoided the direct too big structural strength who influences the blade of mounting hole on the blade simultaneously.

Description

Double-round nut for wind power blade

Technical Field

The utility model relates to a two round nut for wind-powered electricity generation blade.

Background

In recent years, with the background of national policy support and energy supply tension, the wind generating set in China has been developed from the former 0.75 megawatt, 1.5 megawatt and 2.5 megawatt to the present 5 megawatt, 6 megawatt, 8 megawatt and even more than 10 megawatt, and the wind generating set tends to be more and more powerful. In order to make full use of the wind power generation set, the matched blades are also longer, and the total length exceeds more than 90 meters. In order to ensure the safety and reliability of the blade in the use process, the diameter of the blade has to be increased to ensure the connection strength between the blade and the hub.

A common way of connecting the blade to the hub is by bolts, i.e. one end of a stud bolt is connected to the blade and the other end is connected to a bolt. At the blade root, a mounting hole is drilled, a nut is then embedded in the hole, and one end of a stud bolt extending in the axial direction of the blade is then attached to the round nut. For a large-sized blade, in order to ensure the connection strength, the contact area between the round nut and the blade needs to be increased, namely the diameter of the round nut is increased, and the diameter of the increased round nut is equal to the diameter of a drill hole at the blade root, so that the strength at the blade root is reduced, and the fracture risk exists. In addition, the diameter of the blade root can be increased, but the cost of the blade is increased greatly.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a two round nuts for wind-powered electricity generation blade in order to overcome among the prior art blade cost and the contradictory defect of blade root department bolted connection intensity.

The utility model discloses an above-mentioned technical problem is solved through following technical scheme:

the utility model provides a two round nut for wind-powered electricity generation blade which characterized in that, it is including:

the first column body is provided with a first cylindrical surface and a first plane on the outer peripheral surface, the first plane is parallel to the axis of the first column body, and the first plane is provided with a threaded hole;

the outer peripheral surface of the second cylinder body is provided with a second cylindrical surface and a second plane, the second plane is parallel to the axis of the second cylinder body, the second plane is provided with a circular through hole, the first plane is over against the second plane, the threaded hole and the circular through hole are coaxially arranged, and the diameter of the circular through hole is larger than that of the threaded hole.

Preferably, the axis of the threaded hole perpendicularly intersects with the axis of the first cylinder, and the axis of the circular through hole perpendicularly intersects with the axis of the second cylinder.

Preferably, the perpendicularity of the threaded hole and the first plane is less than 0.01mm, and the perpendicularity of the circular through hole and the second plane is less than 0.01 mm.

Preferably, the first plane and the second plane completely cover each other.

Preferably, the double-round nut for the wind power blade is made of alloy steel.

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The utility model discloses an actively advance the effect and lie in: through combining first cylinder and second cylinder, increased the area of contact of two round nuts with the blade root, strengthened the joint strength between nut and the blade, avoided the direct too big structural strength who influences the blade of mounting hole on the blade simultaneously.

Drawings

Fig. 1 is a schematic top view sectional structure diagram of a double round nut for a wind power blade according to a preferred embodiment of the present invention.

Fig. 2 is a right-side view structural schematic diagram of a double-round nut for a wind power blade according to the preferred embodiment of the present invention.

Fig. 3 is a schematic sectional structure diagram of a double round nut for a wind power blade installed on the blade according to a preferred embodiment of the present invention.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Description of reference numerals:

first cylinder 100

First cylindrical surface 110

First plane 120

Threaded hole 130

Second cylinder 200

Second cylindrical surface 210

Second plane 220

Circular through hole 230

Blade 300

Connecting hole 310

Detailed Description

The present invention will be more clearly and completely described below with reference to the accompanying drawings.

Fig. 1 and 2 show a double round nut for a wind turbine blade, comprising: a first cylinder 100 and a second cylinder 200. The first cylinder 100 has a first cylindrical surface 110 and a first plane 120 on its outer peripheral surface, the first plane 120 is parallel to the axis of the first cylinder 100, and the first plane 120 has a threaded hole 130. The outer peripheral surface of the second cylinder 200 is provided with a second cylindrical surface 210 and a second plane 220, the second plane 220 is parallel to the axis of the second cylinder 200, the second plane 220 is provided with a circular through hole 230, the first plane 120 is opposite to the second plane 220, the threaded hole 130 and the circular through hole 230 are coaxially arranged, and the diameter of the circular through hole 230 is larger than that of the threaded hole 130.

In this embodiment, the double-round nut is formed by respectively processing and combining two semicircular T-shaped nuts, wherein one half of the double-round nut is a round nut with a threaded hole 130 of M36, the other half of the double-round nut is a round nut with a round through hole 230 of phi 38, and the diameter of the two semicircular T-shaped nuts is phi 56, which is relatively larger. In consideration of the high strength of the nut, the nut is subjected to thermal treatment quenching and tempering in this embodiment. The raw material needs to be an alloy material with better quenching performance, and is usually processed by 42 CrMoA. After quenching and tempering, the hardness of the nut reaches HRC 26-36, and the yield is more than or equal to 850 MPa. In practical application, a threaded round nut is needed to ensure that the load reaches 866kN, the threads adopt 6G precision, and the product can be ensured to be matched with the stud bolt after surface treatment. In order to ensure that the double-circle nut and the stud bolt can be attached to each other after being stressed in a pre-tightening manner, displacement cannot be generated, stress is uniform, the nut with the threaded hole 130 and the nut with the circular through hole 230 are milled to form a first plane 120 and a second plane 220 by removing 1/3 left and right semi-circles, the milled planes are flat and smooth, and the first plane 120 and the second plane 220 are completely covered with each other. In order to ensure that the double-round nut has better corrosion resistance, the surface is treated by Dacromet triple-coating and triple-baking, and a salt spray test for 1000 hours is ensured.

As will be understood by referring to fig. 3 and 4, when the double-round nut is used, the position of the double-round nut at the root of the blade 300 is determined, then two gourd holes with mutually overlapped round holes are drilled according to the shape of the double-round bolt, then the double-round nut is embedded in the gourd holes, a connecting hole 310 communicated to the gourd holes is processed on the end surface of the root of the blade 300, and the stud bolt passes through the connecting hole 310 and the round through hole 230 to be connected to the threaded hole 130, so that the purpose of connecting the bolt with the wind power blade is achieved.

In the scheme, the axis of the threaded hole 130 is vertically intersected with the axis of the first cylinder 100, and the axis of the circular through hole 230 is vertically intersected with the axis of the second cylinder 200, so that the threaded hole 130 and the circular through hole 230 are respectively positioned in the middle positions of the first cylinder 100 and the second cylinder 200, and the structural strength of the threaded hole 130 and the circular through hole 230 is ensured.

In addition, the perpendicularity of the threaded hole 130 and the first plane 120 is less than 0.01mm, and the perpendicularity of the circular through hole 230 and the second plane 220 is less than 0.01 mm. The higher perpendicularity can ensure that the positive threaded hole 130 and the circular through hole 230 have higher coaxiality.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. The utility model provides a two round nut for wind-powered electricity generation blade which characterized in that, it is including:

2. The double-round nut for a wind power blade as claimed in claim 1, wherein an axis of the threaded hole perpendicularly intersects an axis of the first cylinder, and an axis of the circular through hole perpendicularly intersects an axis of the second cylinder.

3. The double round nut for wind power blades according to claim 1, characterized in that the perpendicularity of the threaded hole to the first plane is less than 0.01mm, and the perpendicularity of the round through hole to the second plane is less than 0.01 mm.

4. The double round nut for a wind blade according to claim 1, characterized in that said first plane and said second plane completely cover each other.

5. The double-round nut for the wind power blade as claimed in any one of claims 1 to 4, wherein the material of the double-round nut for the wind power blade is alloy steel.