CN114909254A - Wind power blade and forming method - Google Patents

Abstract

The invention relates to the technical field of wind power equipment, in particular to a wind power blade and a forming method. A wind power blade includes: a blade body, a main beam, a metal foil and a carbon fiber layer. An accommodation space is provided inside the blade body. The main beam is arranged in the accommodating space. The metal foil is connected to the outer surface of the blade body, and the metal foil is connected to the ground wire. The carbon fiber layer is arranged between the blade body and the metal foil, and from the outer side of the blade body to the inside, the metal foil, the carbon fiber layer and the blade body are stacked and connected in sequence. The wind power blade of the invention has the following advantages: more targeted lightning strike protection of the carbon fiber blade, which is conducive to rapid perfusion of the blade and avoidance of perfusion defects; realization of an equipotential balance channel between the carbon fiber main beam and the surface metal foil, which is beneficial to The lightning current inside the carbon fiber is quickly discharged to avoid the damage of the carbon fiber lightning strike; the molding is simple, the cost is low, the lightning protection effect is safe and reliable, and the service life is long.

Description

A kind of wind power blade and forming method

technical field

The invention relates to the technical field of wind power equipment, in particular to a wind power blade and a forming method.

Background technique

There are large areas of grasslands, mountains, oceans and other relatively open areas on the earth. In these areas, there are no obstacles and the wind is strong. Therefore, many wind power equipment has been built in these areas to effectively utilize the wind power. Converting wind power into electricity provides people with electricity while saving a lot of energy. With the development of wind power, wind power equipment has also been continuously improved. In recent years, the development of large-scale and lightweight wind power blades has driven the demand for carbon fiber wind power blades. Because of its excellent performance, carbon fiber can be used in wind power blades to make the blades longer and lighter, and better improve the utilization of wind energy. It is especially widely used on the main beam of wind turbine blades.

However, in these places, the wind is strong and lightning strikes are frequent. However, carbon fiber is a poor conductor, which is easy to induce lightning but cannot quickly disperse the lightning, which will cause serious damage to the blade structure and bring huge maintenance costs. The carbon fiber blade commonly used at present is that the main beam is carbon fiber, and other shell materials are glass fiber. The carbon fiber main beam is laid inside the blade, and the glass fiber is laid on the surface of the blade. The general lightning protection method is to lay a large area of metal mesh in the carbon fiber main beam area from the tip to the root, and receive and conduct lightning through the metal mesh.

The Chinese utility model patent with the publication number CN209959402U discloses a new type of lightning-proof wind power blade, including a blade body, the blade body includes a blade outer shell and a blade inner shell, and a space between the blade outer shell and the blade inner shell is filled. Carbon fiber filler, the surface of the blade shell is provided with a tip air-termination device and three middle air-termination devices, and an air-termination strip is arranged on the surface of the blade shell interlaced between the tip air-termination device and the three middle air-termination devices, The lightning strip is arranged in a wave shape, a lightning protection net is arranged inside the inner shell of the blade, and one end of the lightning protection net is connected with a lightning arrester, and the lightning arrester is connected to the external grounding device. The lightning terminals are connected to the lightning protection net through wires. The utility model is provided with a lightning protection net and a lightning arrester, which is beneficial for the lightning arrester to consume the ionization, and the remaining ionization is guided to the ground through the grounding device, thereby preventing the lightning current from being too large and causing blade damage.

However, according to statistics, most lightning strikes occur at the edge of the carbon fiber main beam, and after the carbon fiber main beam is struck by lightning, the lightning cannot be quickly conducted to the surface metal mesh. This is mainly because the carbon fiber main beam and the metal mesh have no potential balance connection channel. , the lightning current on the carbon fiber cannot be quickly released to the surface metal mesh.

SUMMARY OF THE INVENTION

In view of this, the present invention aims to provide a wind power blade, which adopts metal foil on the outer surface of the blade body, the main beam is arranged, and carbon fiber cloth is arranged between the metal foil and the blade body, so as to solve the problem that there is no potential balance connection channel, The problem of not being able to quickly discharge the lightning current on the carbon fiber to the surface metal mesh.

In order to achieve the above object, the technical scheme of the present invention is achieved in this way:

A wind power blade, comprising: a blade body, an accommodation space is arranged inside the blade body;

a main beam, arranged in the accommodating space;

a metal foil, connected to the outer surface of the blade body, and the metal foil is connected to the ground wire;

The carbon fiber layer is arranged between the blade body and the metal foil, and from the outer side of the blade body to the inner side, the metal foil, the carbon fiber layer and the blade body are stacked and connected in sequence.

Further, the main beam extends from the tip portion of the blade body to the root portion;

The metal foil includes:

a leading edge foil disposed adjacent to the leading edge side of the blade body and extending from the root portion to the tip portion;

a trailing edge foil disposed near the trailing edge side of the blade body and extending from the root to the tip;

The leading edge foil and the trailing edge foil are connected at the tip.

Further, the width of the main beam is smaller than the distance between the leading edge foil and the trailing edge foil;

The leading edge foil and the trailing edge foil are arranged symmetrically in a direction from the leading edge to the trailing edge.

Further, the wind power blade also includes:

The lightning receptor is arranged on the tip of the blade body.

Further, the connecting end of the leading edge foil and the trailing edge foil at the tip portion is the lightning receptor.

Further, the metal disk includes a front disk connected to the leading edge foil and a rear disk connected to the trailing edge foil;

The metal foil is clamped on the outer surface of the root by the front disc and the rear disc.

Further, the ground wire is connected to the metal disk.

Further, the carbon fiber layer includes:

carbon fiber felt, which is attached and connected to the main beam;

The carbon fiber cloth is arranged between the carbon fiber felt and the metal foil, and is attached and connected to the carbon fiber felt and the metal foil respectively.

Further, an outer skin is laid on the outer surface of the blade body other than the metal foil.

A method for forming a wind power blade, wherein the wind power blade is the wind power blade according to any one of the above, and the forming method includes:

S100, laying the metal foil on the surface of the blade body mold, then laying the outer skin, and removing the skin cloth of the outer skin in the metal foil area;

S200, filling carbon fiber cloth in the blade body mold, then laying carbon fiber felt in the main beam area, laying the main beam on the carbon fiber felt, filling carbon fiber material, and performing vacuum resin infusion;

S300, after the blade is demolded, connect the ground wire of the metal disk at the root of the blade, and the ground wires are combined into a ground at the root of the blade.

Compared with the prior art, the wind power blade of the present invention has the following advantages:

The advantage of this technical solution is that metal foils are arranged on both sides of the carbon fiber main beam, and the lightning strike protection of the carbon fiber blade is more targeted. The laying of carbon fiber felt on the lower layer of the main beam area is conducive to the rapid perfusion of the blade and avoids perfusion defects; The equipotential balance channel of the main beam and the metal foil on the surface is conducive to the rapid discharge of the lightning current inside the carbon fiber and avoids the lightning strike damage of the carbon fiber; the wind power blade for lightning strike protection of the present invention is simple in shape, low in cost, safe and reliable in lightning protection effect, and long in service life .

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic diagram of a wind turbine blade according to an embodiment of the present invention;

2 is a cross-sectional view of a wind turbine blade according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a metal foil grounding structure according to an embodiment of the present invention.

Description of reference numbers:

1-Blade body, 101-Outer skin, 2-Main beam, 3-Metal foil, 31-Leading edge foil, 32-Trailing edge foil, 4-Carbon fiber layer, 41-Carbon fiber felt, 42-Carbon fiber cloth, 5-ground wire, 6-metal plate.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

The descriptions involving "first", "second", "upper", "lower", etc. in the present invention are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implying the indicated technology number of features. Thus, features defined as "first", "second", "upper", "lower" may expressly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the technical solutions between the embodiments can be combined, it is within the protection scope of the present invention. Inside.

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

As shown in FIG. 1 and FIG. 2 , a wind power blade includes: a blade body 1 , a main beam 2 , a metal foil 3 and a carbon fiber layer 4 . An accommodation space is provided inside the blade body 1 . The main beam 2 is arranged in the accommodating space. The metal foil 3 is connected to the outer surface of the blade body 1 , and the metal foil 3 is connected to the ground wire 5 . The carbon fiber layer 4 is arranged between the blade body 1 and the metal foil 3. From the outer side of the blade body 1 to the inside, the metal foil 3, the carbon fiber layer 4 and the blade body 1 are stacked and connected in sequence. .

Metal foils 3 are arranged on both sides of the carbon fiber main beam 2, and the lightning strike protection of the carbon fiber blades is more targeted. The carbon fiber felt 41 laid on the lower layer of the main beam 2 area is conducive to the rapid perfusion of the blades and avoids perfusion defects; The equipotential balance channel of the main beam 2 and the surface metal foil 3 is conducive to the rapid discharge of the lightning current inside the carbon fiber and avoids the lightning strike damage of the carbon fiber; the wind power blade for lightning strike protection of the present invention is simple in shape, low in cost, safe and reliable in lightning protection effect, and is easy to use. long life. In this embodiment, the metal foil is one of copper, aluminum, stainless steel and nickel, and the thickness ranges from 0.05 to 5 mm, preferably from 0.1 to 3 mm.

Specifically, the main beam 2 extends from the tip of the blade body 1 to the root. The metal foil 3 includes: a leading edge foil 31 and a trailing edge foil 32 . The leading edge foil 31 is provided close to the leading edge side of the blade body 1 and extends from the root to the tip. The trailing edge foil 32 is provided close to the trailing edge side of the blade body 1 and extends from the root to the tip. The leading edge foil 31 and the trailing edge foil 32 are connected at the tip.

Further, the width of the main beam 2 is smaller than the distance between the leading edge foil 31 and the trailing edge foil 32 . The leading edge foil 31 and the trailing edge foil 32 are symmetrically arranged in the direction from the leading edge to the trailing edge.

The leading edge foil 31 and the trailing edge foil 32 of the metal foil 3 are respectively arranged on both sides of the leading edge and the trailing edge of the blade body 1, so that the carbon fiber main beam 2 and the metal foil 3 form a potential balance connection channel, and the metal foil 3 pairs The lightning in the carbon fiber main beam 2 area is intercepted and conducted to the root grounding, which can quickly discharge the lightning current on the carbon fiber to the metal foil 3 on the surface, effectively protecting the carbon fiber main beam 2 .

Further, the wind power blade further includes: an air-termination device (not shown in the figure), which is arranged on the tip of the blade body 1 .

The lightning receptor is a component disposed on the blade body 1 to receive lightning strikes, and is connected to the ground to introduce the lightning current into the ground, effectively protecting the blade body 1 and the main beam 2 .

Further, the connecting end of the leading edge foil 31 and the trailing edge foil 32 at the tip portion is the lightning receptor.

The leading edge foil 31 and the trailing edge foil 32 are connected together at the tip, and the metal foil 3 at the tip is used as the air-termination device, which simplifies the structure of the blade and saves the time between the air-termination device and the metal foil 3. The connection device is convenient for manufacture, installation and daily maintenance.

Further, the metal disk 6 includes a front disk connected to the leading edge foil 31 and a rear disk connected to the trailing edge foil 32 . The metal foil 3 is held on the outer surface of the root by the front disc and the rear disc.

The front disk and the rear disk are respectively connected with the leading edge foil 31 and the trailing edge foil 32 by welding.

Further, the ground wire 5 is connected to the metal plate 6 .

The ground wire 5 is connected to the metal foil 3 through the metal plate 6, which is convenient for installation.

Further, the carbon fiber layer 4 includes: a carbon fiber felt 41 and a carbon fiber cloth 42 . The carbon fiber felt 41 is attached and connected to the main beam 2 . The carbon fiber cloth 42 is disposed between the carbon fiber felt 41 and the metal foil 3 , and is attached and connected to the carbon fiber felt 41 and the metal foil 3 respectively.

Further, the width of the carbon fiber cloth 42 is equivalent to the width of the metal foil 3 , and the thickness is equivalent to the thickness of the outer skin 101 of the blade body 1 . The material of the carbon fiber cloth 42 is the same as the carbon fiber material used for the main beam 2 .

The carbon fiber felt 41 is laid on the lower layer of the carbon fiber main beam 2, and is in direct contact with the carbon fiber main beam 2, which helps the carbon fiber main beam 2 to perfuse and infiltrate. The width of the carbon fiber felt 41 is wider than that of the carbon fiber main beam 2 . The carbon fiber cloth 42 is located in the lower layer of the carbon fiber felt 41 and the upper layer of the metal foil 3, and is in direct contact with the carbon fiber felt 41 and the metal foil 3 to form a potential balance channel between the carbon fiber main beam 2 and the surface metal foil 3, which is conducive to the rapid discharge of lightning current inside the carbon fiber main beam 2 put.

Further, an outer skin 101 is laid on the outer surface of the blade body 1 other than the metal foil 3 .

A method for forming a wind power blade, wherein the wind power blade is the wind power blade according to any one of the above, and the forming method includes:

S100, laying the metal foil on the surface of the blade body mold, then laying the outer skin, and removing the skin cloth of the outer skin in the metal foil area;

S200, filling carbon fiber cloth in the blade body mold, then laying carbon fiber felt in the main beam area, laying the main beam on the carbon fiber felt, filling carbon fiber material, and performing vacuum resin infusion;

S300, after the blade is demolded, connect the ground wire of the metal disk at the root of the blade, and the ground wires are combined into a ground at the root of the blade.

Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or conventional techniques in the art not disclosed by this disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

It should be understood that the present invention is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims (10)

1. a wind power blade, is characterized in that, comprises: a blade body (1), a accommodating space is provided inside the blade body (1); a main beam (2), arranged in the accommodating space; a metal foil (3) connected to the outer surface of the blade body (1), and the metal foil (3) is connected to the ground wire (5); A carbon fiber layer (4), disposed between the blade body (1) and the metal foil (3), from the outer side of the blade body (1) to the inside, the metal foil (3), the carbon fiber The layer (4) and the blade body (1) are stacked and connected in sequence. 2. The wind turbine blade according to claim 1, characterized in that, the main beam (2) extends from the tip of the blade body (1) to the root; The metal foil (3) includes: a leading edge foil (31) disposed close to the leading edge side of the blade body (1) and extending from the root to the tip; a trailing edge foil (32) disposed close to the trailing edge side of the blade body (1) and extending from the root to the tip; The leading edge foil (31) and the trailing edge foil (32) are connected at the tip. 3. The wind turbine blade according to claim 2, characterized in that, The width of the main beam (2) is smaller than the distance between the leading edge foil (31) and the trailing edge foil (32); The leading edge foil (31) and the trailing edge foil (32) are symmetrically arranged in the direction from the leading edge to the trailing edge. 4. The wind turbine blade according to claim 2, further comprising: The lightning receptor is arranged on the tip of the blade body (1). 5. The wind turbine blade according to claim 4, characterized in that, The connecting end of the leading edge foil (31) and the trailing edge foil (32) at the tip portion is the lightning receptor. 6. The wind power blade according to claim 5, characterized in that, the metal disc (6) comprises a front disc connected to the leading edge foil (31) and a rear disc connected to the trailing edge foil (32); The metal foil (3) is clamped on the outer surface of the root by the front disc and the rear disc. 7. The wind power blade according to claim 6, characterized in that, The ground wire (5) is connected to the metal disk (6). 8. The wind power blade according to claim 1, wherein the carbon fiber layer (4) comprises: a carbon fiber felt (41), which is attached and connected to the main beam (2); A carbon fiber cloth (42) is disposed between the carbon fiber felt (41) and the metal foil (3), and is attached and connected to the carbon fiber felt (41) and the metal foil (3) respectively. 9. The wind power blade according to claim 1, wherein, An outer skin (101) is laid on the outer surface of the blade body (1) outside the metal foil (3). 10. A method for forming a wind power blade, wherein the wind power blade is the wind power blade according to any one of claims 1 to 9, wherein the forming method comprises: S100, laying the metal foil on the surface of the blade body mold, then laying the outer skin, and removing the skin cloth of the outer skin in the metal foil area; S200, filling carbon fiber cloth in the blade body mold, then laying carbon fiber felt in the main beam area, laying the main beam on the carbon fiber felt, filling carbon fiber material, and performing vacuum resin infusion; S300, after the blade is demolded, connect the ground wire of the metal disk at the root of the blade, and the ground wires are combined into a ground at the root of the blade.

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