Fixing device for wind power blade flange

Abstract

The utility model relates to a fixing device of a wind power blade flange, which is characterized in that a metal connecting plate is welded on the blade flange, after the blade flange with the metal connecting plate is positioned in place, the blade flange and a wind power blade are fixed by adopting a flange fixing bolt, and the metal connecting plate and the wind power blade are fixed by adopting a metal connecting plate fixing bolt. The metal connecting plate is arranged between the blade flange and the wind power blade, so that the stability of connection between the blade flange and the wind power blade is enhanced, and deformation or loosening of connection between the blade flange and the wind power blade caused by too large vibration amplitude or too long vibration time between the blade flange and the wind power blade is avoided; the connection firmness and safety of the blade flange and the wind power blade are improved, the service life of the wind power blade is prolonged, and the power generation efficiency of the wind power blade is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of wind turbine blades, and in particular relates to a fixing device for a wind turbine blade flange. Background Art

[0002] Wind energy is a clean renewable energy source, and wind power generation is one of the most mature, large-scale development conditions and commercial development prospects in the field of renewable energy. Using wind energy to generate electricity is very environmentally friendly and has huge wind energy reserves. China is rich in wind energy resources, with about 1 billion kW of wind energy reserves that can be developed and utilized. By the end of 2023, the national grid-connected wind power installed capacity will be 441.34 million kilowatts, an increase of 20.7%. Its development is increasingly attracting people's attention.

[0003] Wind turbines can be divided into horizontal-axis wind turbines and vertical-axis wind turbines. Blades are the core components of wind turbines. For horizontal-axis wind turbines, the rotor is located at an altitude of 100 meters, the blade length of the rotor is tens of meters and it rotates at high speed. Its reliability plays a vital role in the safe operation of the unit. As one of the components of wind turbine blades, blade flanges are an important component that connects blades and units. Their performance directly affects the operating efficiency and quality of wind turbines.

[0004] At present, the blade flange is mainly fixed to the end face of the wind turbine blade (such as Figure 1 ), but since the wind turbine is prone to vibration during operation, when the vibration amplitude is too large or the duration is too long, the flange fixing bolts 3 are prone to loosening, making the blade flange 1 unstable, thereby causing the connection between the blade and the unit to deform or loosen, creating a safety hazard and affecting the power generation efficiency and safety. Utility Model Content

[0005] (I) Purpose of the utility model

[0006] In order to solve the problem that the flange fixing bolts of the connection structure between the blade flange and the wind turbine blade in the existing wind turbine generator set are loosened due to the large amplitude and duration of vibration during operation, which makes the blade flange unstable, resulting in deformation or loosening of the connection between the blade and the unit, which is easy to cause safety hazards and affect the power generation efficiency, the utility model proposes a fixing device for the wind turbine blade flange, by providing a metal connecting plate welded to the blade flange, and positioning the blade flange with the metal connecting plate to the blade root, and fixing the flange to the blade root with flange fixing bolts, and fixing the metal connecting plate to the outer surface of the blade root with metal connecting plate bolts, so as to strengthen the connection between the blade flange and the wind turbine blade and prevent loosening, thereby improving the safety of wind turbine operation, extending the practical life of wind turbine blades, and improving power generation efficiency.

[0007] (II) Technical solution

[0008] The utility model provides a fixing device for a wind turbine blade flange, comprising a wind turbine blade, a blade flange, and flange fixing bolts, and is characterized in that it also comprises a metal connecting plate and a connecting plate fixing bolts;

[0009] Among them, a plurality of bolt fixing holes are evenly distributed along the circumferential direction near the root side of the wind turbine blade; the metal connecting plate includes a first part welded to the blade flange and a second part perpendicular to the first part and used for fixing with bolts on the surface of the wind turbine blade; and more than two metal connecting plate bolt holes are provided on the second part of the metal connecting plate;

[0010] The second part of the metal connecting plate is placed close to the center of the blade flange and is perpendicularly bisected by a radial line extending outward from the center of the blade flange. The first parts of multiple metal connecting plates are welded to the back side of the blade flange close to the wind turbine blade along the circumferential direction of the blade flange. The blade flange with multiple metal connecting plates is aligned and abutted against the wind turbine blade. The blade flange is rotated so that the metal connecting plate bolt holes on the second part of the metal connecting plate are aligned with the bolt fixing holes on the wind turbine blade. The blade flange is fixed to the root end face of the wind turbine blade by the flange fixing bolts. The metal connecting plate fixing bolts are used to fix the metal connecting plate to the surface of the wind turbine blade to achieve fixation of the wind turbine blade and the blade flange.

[0011] Preferably, the second part of the metal connecting plate is fixed to the outer surface of the wind turbine blade.

[0012] Preferably, the metal connecting plate fixing bolts penetrate the metal connecting plate bolt holes of the second part of the metal connecting plate from the outside and are threadedly connected and fastened with the bolt fixing holes on the wind turbine blades.

[0013] Preferably, the metal connecting plates are evenly distributed along the circumference of the blade flange.

[0014] Preferably, the number of the metal connecting plates 2 is four.

[0015] Preferably, the number of the metal connecting plates 2 is an even number.

[0016] Preferably, the position where the blade flange is welded to the first part of the metal connecting plate is located between adjacent bolt holes of the blade flange.

[0017] Preferably, the bolt fixing holes on the surface of the wind turbine blade are opened along the extension direction of the wind turbine blade.

[0018] Preferably, the bolt fixing holes on the surface of the wind turbine blade correspond one-to-one to the metal connecting plate bolt holes on the second part of the metal connecting plate.

[0019] Preferably, the transition portion between the first portion and the second portion of the metal connecting plate may be a right-angle or arc transition.

[0020] (III) Technical Effect

[0021] The utility model enhances the stability of the connection between the blade flange and the wind turbine blade by arranging a metal connecting plate between the blade flange and the wind turbine blade, avoids deformation or loosening of the connection between the blade flange and the wind turbine blade due to excessive vibration amplitude or excessively long vibration time, improves the firmness and safety of the connection between the blade flange and the wind turbine blade, extends the service life of the wind turbine blade, and ensures the power generation efficiency of the wind turbine blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the connection between a blade flange and a wind turbine blade in the prior art.

[0023] Figure 2 This is a structural diagram of the connection between the blade flange and the wind turbine blade of the utility model.

[0024] Figure 3 yes Figure 2 View along AA direction.

[0025] Description of Reference Numerals

[0026] 1-blade flange, 2-metal connecting plate, 3-flange fixing bolts, 4-metal connecting plate fixing bolts, 5-wind turbine blade DETAILED DESCRIPTION

[0027] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the following is only a preferred embodiment of the present invention, but the content of the present invention is not limited to the following embodiments. In fact, various modifications and changes can be made in the present invention without departing from the scope or spirit of the present invention, which will be obvious to those skilled in the art. For example, a feature shown or described as a part of an embodiment can be used together with another embodiment to produce another embodiment. Therefore, it is intended that the present invention includes such modifications and changes within the scope of the attached claims and their equivalents.

[0028] like Figure 2 and Figure 3 As shown, the fixing device of the wind turbine blade flange provided in this embodiment includes a wind turbine blade 5, a blade flange 1, a metal connecting plate 2, flange fixing bolts 3 and connecting plate fixing bolts 4;

[0029] A plurality of bolt fixing holes are evenly distributed along the circumferential direction on the root side of the wind turbine blade 1;

[0030] The metal connecting plate 2 includes a first portion welded to the blade flange and a second portion perpendicular to the first portion and used to be bolted to the surface of the wind turbine blade 5; more than two metal connecting plate bolt holes are provided on the second portion of the metal connecting plate 2;

[0031] The second part of the metal connecting plate 2 is placed close to the center of the blade flange 1 and is perpendicularly bisected by a radial line extending outward from the center of the blade flange 1. The first parts of multiple metal connecting plates 2 are welded to the flange back side of the blade flange 1 close to the wind turbine blade 5 along the circumferential direction of the blade flange 1. The blade flange 1 with multiple metal connecting plates 2 is aligned and abutted against the wind turbine blade 5. The blade flange 1 is rotated so that the metal connecting plate bolt holes on the second part of the metal connecting plate 2 are aligned with the bolt fixing holes on the wind turbine blade 5. The blade flange 1 is fixed to the root end face of the wind turbine blade 5 by the flange fixing bolts 3. The metal connecting plate fixing bolts 4 are used to fix the metal connecting plate 2 to the surface of the wind turbine blade 5, so as to achieve the fixation of the wind turbine blade 5 and the blade flange 1.

[0032] The second part of the metal connecting plate 2 is fixed to the outer surface of the wind turbine blade 5 .

[0033] The metal connecting plate fixing bolt 4 penetrates the metal connecting plate bolt hole of the second part of the metal connecting plate 2 from the outside and is threadedly connected with the bolt fixing hole on the wind turbine blade 5 and fastened.

[0034] The metal connecting plates 3 are evenly distributed along the circumference of the blade flange.

[0035] The number of the metal connecting plates 2 is four.

[0036] The number of the metal connecting plates 2 is an even number.

[0037] The position where the blade flange 1 and the first part of the metal connecting plate 2 are welded is located between adjacent bolt holes of the blade flange 1 .

[0038] The bolt fixing holes on the surface of the wind turbine blade 5 are opened along the extension direction of the wind turbine blade 5 .

[0039] The bolt fixing holes on the surface of the wind turbine blade 5 correspond one to one with the metal connecting plate bolt holes on the second portion of the metal connecting plate 2 .

[0040] The transition portion between the first portion and the second portion of the metal connecting plate 2 can be a right angle or arc transition, and the connecting portion has sufficient connection strength.

[0041] By arranging a metal connecting plate 2 between the blade flange 1 and the wind turbine blade 5, the stability of the connection between the blade flange 1 and the wind turbine blade 5 is enhanced, and deformation or loosening of the connection between the blade flange 1 and the wind turbine blade 5 caused by excessive vibration amplitude or excessively long vibration time is avoided, thereby improving the firmness and safety of the connection between the blade flange 1 and the wind turbine blade 5, extending the service life of the wind turbine blade, and ensuring the power generation efficiency of the wind turbine blade 5.

[0042] The fixing bolts of the metal connecting plate of the utility model can be replaced by bolts of any kind, and the material is not limited.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fixing device for a wind turbine blade flange, comprising a wind turbine blade (5), a blade flange (1), and flange fixing bolts (3), characterized in that: It also includes a metal connecting plate (2) and connecting plate fixing bolts (4); A plurality of bolt fixing holes are evenly distributed along the circumferential direction near the root side of the wind turbine blade (5); the metal connecting plate (2) comprises a first portion welded to the blade flange (1) and a second portion perpendicular to the first portion and used for being bolted to the surface of the wind turbine blade (5); and more than two metal connecting plate bolt holes are provided on the second portion of the metal connecting plate (2); The second part of the metal connecting plate (2) is placed close to the center of the blade flange (1) and is perpendicularly bisected by a radial line extending outward from the center of the blade flange (1). The first parts of the plurality of metal connecting plates (2) are welded to the flange back of the blade flange (1) close to the wind turbine blade (5) along the circumferential direction of the blade flange (1). The blade flange (1) with the plurality of metal connecting plates (2) is aligned and abutted against the wind turbine blade (5). The blade flange (1) is rotated so that the metal connecting plate bolt holes on the second part of the metal connecting plate (2) are aligned with the bolt fixing holes on the wind turbine blade (5). The blade flange (1) is fixed to the root end face of the wind turbine blade (5) by flange fixing bolts (3). The metal connecting plate fixing bolts (4) are used to fix the metal connecting plate (2) to the surface of the wind turbine blade (5), thereby achieving the fixation of the wind turbine blade (5) to the blade flange (1).

2. The fixing device according to claim 1, characterized in that: The second part of the metal connecting plate (2) is fixed to the outer surface of the wind turbine blade (5).

3. The fixing device according to claim 1, characterized in that: The metal connection plate fixing bolt (4) penetrates the metal connection plate bolt hole of the second part of the metal connection plate (2) from the outside and is then threadedly connected to and fastened with the bolt fixing hole on the wind turbine blade (5).

4. The fixing device according to claim 1, characterized in that: The metal connecting plates (2) are evenly distributed along the circumference of the blade flange (1).

5. The fixing device according to claim 1, characterized in that: The position where the blade flange (1) and the first part of the metal connecting plate (2) are welded is located between adjacent bolt holes of the blade flange (1).

6. The fixing device according to claim 1 or 3, characterized in that: The bolt fixing holes on the surface of the wind turbine blade (5) are opened along the extension direction of the wind turbine blade (5).

7. The fixing device according to claim 1, characterized in that: The bolt fixing holes on the surface of the wind turbine blade (5) correspond one to one with the metal connecting plate bolt holes on the second part of the metal connecting plate (2).

8. The fixing device according to claim 1, characterized in that: The transition portion between the first portion and the second portion of the metal connecting plate (2) can be a right-angle or circular arc transition.

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