A lightning protection mechanism for fan blades

Abstract

The present invention proposes a lightning protection mechanism for wind turbine blades, which is arranged on the upper shell and the lower shell of the blade, wherein the upper shell and the lower shell of the blade are provided with a carbon beam, and the upper surface and the lower surface of the upper shell and the lower shell of the blade are provided with a plurality of contacts, including: a conductive strip, a tin-copper alloy sheet, and an aluminum mesh located in the upper shell and the lower shell of the blade and wrapped outside the carbon beam, wherein a plurality of conductive strips are arranged at intervals on the upper surface and the lower surface of the carbon beam, wherein the conductive strips include a stainless steel metal felt layer, a carbon felt layer, and a copper belt layer, wherein the stainless steel metal felt layer and the copper belt layer, and the copper belt layer and the carbon felt layer are in contact and connected, wherein the conductive strips are in contact and connected with the carbon beam through the carbon felt layer, wherein one end of the copper belt layer extends to the outside of the stainless steel metal felt layer and the carbon felt layer and is connected with the aluminum mesh, wherein a plurality of tin-copper alloy sheets are cast on the aluminum mesh, and the tin-copper alloy sheets and the contacts can be conductively connected. The present invention can fully capture lightning on the blades and can effectively reduce the current intensity generated by lightning strikes, thereby improving the safety of the drainage process.

Description

Technical Field

[0001] The invention relates to the technical field of lightning protection devices for wind turbine generators, in particular to a lightning protection mechanism for wind turbine blades. Background Art

[0002] Wind power generation converts wind energy into electrical energy. my country is rich in wind resources, and there is great potential for utilizing wind power generation in accordance with local conditions and the times. Wind turbine blades are one of the core components of wind turbines. In actual use, lightning strikes are a major cause of damage to wind turbine blades. Due to the high cost of wind turbine blades, which account for nearly 20% of the total cost of wind turbines, and the extremely difficult transportation and installation of blades, the cost of repairing and replacing wind turbine blades after being damaged by lightning is very high. In the prior art, a lightning rod is installed on the blade to capture lightning, and a metal lead is provided inside the blade. One end of the metal lead is connected to the lightning rod, and the other end passes through the root of the blade and is connected to the lightning protection interface on the hub, and finally guides the lightning to the ground. The existing technology has the following defects: 1. The number of lightning rods installed is mostly 1-2, which cannot fully capture the lightning on the blades, resulting in poor lightning protection effect on the blades. If you want to improve the lightning protection effect, you need to install a large number of them, which will significantly increase the cost of lightning protection; 2. Only lightning protection metal leads are set inside the blades. Strong current is instantly generated after lightning strikes. There are unsafe factors in the process of metal leads conducting the strong current. For example, strong current breaks through the insulation of the metal lead, and then arc discharges inside the blade, causing damage to the blade cavity or strong current. For example, when strong current is conducted through the metal lead, electric field induction may be generated inside the blade, causing the blade shell to be broken down and damaged, etc. Therefore, how to design a lightning protection mechanism for wind turbine blades that can fully capture lightning on the blades and reduce the strong current generated by lightning strikes before conducting them is a technical problem that urgently needs to be solved. Summary of the invention

[0003] In order to solve the above deficiencies in the prior art, the present invention proposes a lightning protection mechanism for wind turbine blades.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A lightning protection mechanism for wind turbine blades is arranged on an upper blade shell and a lower blade shell. Carbon beams are arranged in the upper blade shell and the lower blade shell. The upper and lower surfaces of the upper blade shell and the lower blade shell are provided with a plurality of contacts, including: a conductive strip, a tin-copper alloy sheet, and an aluminum mesh located in the upper blade shell and the lower blade shell and wrapped around the carbon beam. The plurality of conductive strips are arranged at intervals on the upper and lower surfaces of the carbon beam. The conductive strips include a stainless steel metal felt layer, a carbon felt layer, and a copper belt layer sandwiched between the stainless steel metal felt layer and the carbon felt layer. The stainless steel metal felt layer and the copper belt layer are in contact and connection with each other, and the copper belt layer and the carbon felt layer are in contact and connection with each other. The conductive strip is in contact and connection with the carbon beam through the carbon felt layer. One end of the copper belt layer extends outside the stainless steel metal felt layer and the carbon felt layer and is connected to the aluminum mesh. A plurality of tin-copper alloy sheets are cast on the aluminum mesh. The tin-copper alloy sheets and the contacts can be conductively connected.

[0006] Principle: The contacts are evenly distributed on the upper and lower surfaces of the upper shell of the blade and the upper and lower surfaces of the lower shell of the blade, including the blade root and the blade tip. When lightning strikes, the lightning is collected by the contacts and transmitted to the tin-copper alloy sheet, which is then transmitted to the aluminum mesh. It then passes through the copper belt layer and the carbon felt layer in sequence and is then conducted away by the carbon beam. The contacts and the aluminum mesh can cooperate to collect lightning comprehensively, quickly and efficiently. The conductive strips can significantly reduce the strong current generated by lightning strikes. The coordinated cooperation of various components ultimately achieves the purpose of comprehensively, efficiently and quickly capturing lightning on the blades and conducting the lightning safely.

[0007] Preferably, the conductive strip is arranged perpendicular to the length direction of the carbon beam, and the aluminum mesh matches the shape of the upper shell of the blade and the lower shell of the blade.

[0008] Further preferably, a screw hole is provided in the tin-copper alloy sheet, a screw is provided in the screw hole, one end of the screw is connected to the aluminum mesh through the tin-copper alloy sheet, and the other end is connected to the contact.

[0009] More preferably, the copper belt layer is woven by alternating glass fibers and copper wires as warps and hot-melt wires as wefts, and the stainless steel metal felt layer, the copper belt layer, the carbon felt layer and the carbon beam are fixedly connected by resin nails.

[0010] Most preferably, the number of the conductive strips on the upper surface or the lower surface of the carbon beam is 10-20.

[0011] Compared with the prior art, the present invention can fully capture lightning on the blades and effectively reduce the current intensity generated by lightning strikes, thereby improving the safety of the drainage process. It has a simple structure, scientific design, is easy to implement and has good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] Figure 2 for Figure 1 Schematic diagram of the structure of the conductive strip;

[0015] Figure 3 for Figure 1 Schematic diagram of the connection between the conductive strip and the carbon beam.

[0016] In the figure:

[0017] A. Blade upper shell; B. Carbon beam; 1. Conductive strip; 11. Stainless steel metal felt layer; 12. Copper belt layer; 13. Carbon felt layer; 2. Aluminum mesh; 3. Tin-copper alloy sheet; 31. Screws; 4. Contact. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention discloses a lightning protection mechanism for wind turbine blades, which is arranged on a blade upper housing A (such as Figure 1 shown) and on the lower shell of the blade (not shown, the structure is the same as Figure 1 Similarly. ), a carbon beam B is arranged in the blade upper shell A and the blade lower shell, and a plurality of contacts 4 (metal contacts, preferably silver contacts) are arranged on the upper and lower surfaces of the blade upper shell A and the blade lower shell, including: a conductive strip 1, a tin-copper alloy sheet 3, and an aluminum mesh 2 located in the blade upper shell A and the blade lower shell and wrapped around the carbon beam B, and a plurality of conductive strips 1 are arranged at intervals on the upper and lower surfaces of the carbon beam B, such as Figure 2As shown: the conductive strip 1 includes a stainless steel metal felt layer 11, a carbon felt layer 13 and a copper belt layer 12 sandwiched between the stainless steel metal felt layer 11 and the carbon felt layer 13, the stainless steel metal felt layer 11 and the copper belt layer 12, and the copper belt layer 12 and the carbon felt layer 13 are in contact and connected, the conductive strip 1 is in contact and connected with the carbon beam B through the carbon felt layer 13, one end of the copper belt layer 12 extends to the outside of the stainless steel metal felt layer 11 and the carbon felt layer 13 and is connected to the aluminum mesh 2, a plurality of tin-copper alloy sheets 3 are cast on the aluminum mesh 2, and the tin-copper alloy sheets 3 and the contacts 4 can be conductively connected. When a lightning strike occurs, the lightning is collected by the contact 4 and transmitted to the tin-copper alloy sheet 3, which is then transmitted to the aluminum mesh 2, and then conducted away by the carbon beam B through the copper belt layer 12 and the carbon felt layer 13 in sequence. The contact 4 cooperates with the aluminum mesh 2 to collect lightning comprehensively, quickly and efficiently. The conductive strip 1 can significantly reduce the strong current generated by lightning strikes. The conductive strip 1, the aluminum mesh 2 and the tin-copper alloy sheet 3 work together to ultimately achieve the purpose of comprehensively, efficiently and quickly capturing the lightning on the blades and conducting the lightning safely.

[0020] like Figure 3 As shown: As a preferred technical solution, in another embodiment of the present invention, the conductive strip 1 is arranged perpendicular to the length direction of the carbon beam B, and the aluminum mesh 2 matches the shape of the blade upper shell A and the blade lower shell.

[0021] As a preferred technical solution, in another embodiment of the present invention, a screw hole is provided in the tin-copper alloy sheet 3, and a screw 31 is provided in the screw hole. One end of the screw 31 is connected to the aluminum mesh 2 through the tin-copper alloy sheet 3, and the other end is connected to the contact 4.

[0022] As a preferred technical solution, in another embodiment of the present invention, the copper belt layer 12 is woven by alternating glass fibers and copper wires as warps and hot-melt wires as wefts. In specific use, the copper belt layer 12 is heated and the hot-melt wires melt to make the copper belt layer 12 present a plate structure; the stainless steel metal felt layer 11, the copper belt layer 12, the carbon felt layer 13 and the carbon beam B are fixedly connected by resin nails (the structure is similar to that of staplers, but the material is resin).

[0023] As a preferred technical solution, in yet another embodiment of the present invention, taking into account the cost and lightning protection effect, the number of the conductive strips 1 on the upper surface or the lower surface of the carbon beam B is preferably 10-20.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wind turbine blade lightning protection mechanism, arranged on a blade upper shell (A) and a blade lower shell, wherein a carbon beam (B) is arranged in the blade upper shell (A) and the blade lower shell, and a plurality of contacts (4) are arranged on the upper surface and the lower surface of the blade upper shell (A) and the blade lower shell, Features: include: Conductive strips (1), tin-copper alloy sheets (3), and an aluminum mesh (2) located in an upper shell (A) of a blade and in a lower shell of the blade and wrapped around an outer surface of a carbon beam (B), wherein a plurality of conductive strips (1) are arranged at intervals on the upper surface and the lower surface of the carbon beam (B), the conductive strips (1) comprising a stainless steel metal felt layer (11), a carbon felt layer (13), and a copper strip layer (12) sandwiched between the stainless steel metal felt layer (11) and the carbon felt layer (13), the copper strip layer (12) being woven by alternating glass fibers and copper wires as warps and hot-melt wires as wefts, the stainless steel metal felt layer (11) ), the copper tape layer (12), the carbon felt layer (13) and the carbon beam (B) are fixedly connected by resin nails, the stainless steel metal felt layer (11) and the copper tape layer (2), and the copper tape layer (2) and the carbon felt layer (3) are in contact and connected, the conductive strip (1) is in contact and connected with the carbon beam (B) through the carbon felt layer (13), one end of the copper tape layer (12) extends outside the stainless steel metal felt layer (11) and the carbon felt layer (13) and is connected to the aluminum mesh (2), a plurality of tin-copper alloy sheets (3) are cast on the aluminum mesh (2), and the tin-copper alloy sheets (3) and the contact points (4) are conductively connected.

2. The wind turbine blade lightning protection mechanism according to claim 1, Features: The conductive strip (1) is arranged perpendicular to the length direction of the carbon beam (B), and the aluminum mesh (2) matches the shape of the blade upper shell (A) and the blade lower shell.

3. The wind turbine blade lightning protection mechanism according to claim 1, Features: A screw hole is provided in the tin-copper alloy sheet (3), a screw (31) is provided in the screw hole, one end of the screw (31) is connected to the aluminum mesh (2) through the tin-copper alloy sheet (3), and the other end is connected to the contact (4).

4. The wind turbine blade lightning protection mechanism according to any one of claims 1 to 3, Features: The number of the conductive strips (1) on the upper surface or the lower surface of the carbon beam (B) is 10-20.

Images