Lightning protection system for prolonging wind power blade

Abstract

The utility model discloses a lightning protection system for prolonging a wind power blade, and belongs to the technical field of lightning protection of wind power blades. The system comprises an extended wind power blade, a metal net, a gasket and a connecting bolt. The metal net is laid on the surface of the lengthened wind power blade, the windward side and the leeward side are both laid, the gaskets are installed in a metal foil area at the blade root end of the metal net, the gaskets are a pair of upper gaskets and lower gaskets, the metal net is clamped between the gaskets, the gaskets are used for reinforcing connection, the connecting bolts are in direct contact connection with the gaskets, and meanwhile the connecting bolts are screwed into an original blade tip lightning arrester. The metal net and the original blade tip lightning arrester are connected and conducted through the connecting bolts. The lightning protection system is high in protection efficiency and simple to install.

Description

Technical Field

[0001] This utility model relates to the technical field of lightning protection for wind turbine blades, and in particular to a lightning protection system for extending wind turbine blades. Background Technology

[0002] The wind-catching capacity of a wind turbine is related to its size. Early wind turbine equipment mostly had low towers and small rotors, and the smaller the rotor, the worse its wind-catching capacity. Under the requirements of reducing costs and improving efficiency, replacing existing turbines is expensive and has low cost-effectiveness. From an efficiency perspective, increasing the rotor diameter to increase power generation has become the most direct method. Blade extension has become a common efficiency-enhancing technique. As a "refined" and in-depth technical upgrade, blade extension can allow older turbines to play a greater role. However, lightning protection of the extended blade section is a key factor in ensuring the safe and stable operation of the turbine. The extended section is often at the blade tip, where lightning strikes are frequent. Designing comprehensive lightning protection for the extended blade section is a major challenge. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a lightning protection system for extending wind turbine blades. This lightning protection system has high protection efficiency and is simple to install.

[0004] The technical solution adopted by this utility model is: a lightning protection system for extending wind turbine blades, which includes the original wind turbine blade, a blade tip lightning arrester and a down conductor. The blade tip lightning arrester is set at the tip of the original wind turbine blade and is connected to the down conductor.

[0005] The system also includes extended wind turbine blades, with metal mesh installed on both the windward and leeward sides of the extended wind turbine blades. The metal mesh includes a metal foil area at the blade root, a mesh area, and a metal foil area at the blade tip. The metal foil areas at the blade root on the windward and leeward sides of the extended wind turbine blades are respectively connected to the lightning arrester at the blade tip via connecting bolts.

[0006] The metal mesh has a mesh area in the middle part along its length, gradually transitioning to a leaf tip metal foil area at the leaf tip and a leaf root metal foil area at the leaf root.

[0007] The leaf root metal foil area is semi-circular in shape, and the leaf tip metal foil area is shaped like a leaf tip lightning rod.

[0008] The leaf root metal foil area is equipped with a pair of gaskets, one above the other, which clamp the metal mesh between them. The connecting bolts are in direct contact with the gaskets on the outside of the metal mesh.

[0009] The connecting bolts are in direct contact with the gaskets and are screwed into the original blade tip lightning arrester. The metal mesh and the original blade tip lightning arrester are connected and conductive through the connecting bolts.

[0010] The connecting bolts are two in number, one on the windward side of the blade and one on the leeward side of the blade.

[0011] The present invention has the following advantages:

[0012] The system includes extended wind turbine blades, a metal mesh, gaskets, and connecting bolts. The metal mesh is laid on the surface of the extended wind turbine blades, both on the windward and leeward sides. Gaskets are installed in the metal foil area at the root end of the metal mesh. There are two gaskets, one above the other, which sandwich the metal mesh between them. The gaskets are used to strengthen the connection. The connecting bolts are in direct contact with the gaskets and are also screwed into the original blade tip lightning rod. The connection between the metal mesh and the original blade tip lightning rod is achieved through the connecting bolts.

[0013] The lightning protection design of the extended wind turbine blades avoids the use of down conductors, instead employing a surface metal mesh. This solves the problem of down conductors placed at the tips being easily punctured. The metal mesh increases the flashover area of ​​the blades, resulting in high protection efficiency. The metal mesh gradually transitions into metal foil at both ends, with the foil serving as a reinforcement area to prevent cracking due to insufficient conductivity at the connection points. Installation is simple, efficient, and the connection is reliable. Attached Figure Description

[0014] Figure 1 This is a top view of a lightning protection system for extending wind turbine blades.

[0015] Figure 2 This is a cross-sectional view of a lightning protection system for extending wind turbine blades.

[0016] In the diagram: 1. Original wind turbine blade, 2. Blade tip lightning arrester, 3. Down conductor, 4. Extended wind turbine plate, 401. Windward side of the blade, 402. Leeward side of the blade, 5. Metal mesh, 501. Mesh area, 502. Gold foil area at the blade root, 503. Gold foil area at the blade tip, 6. Gasket, 7. Connecting bolt. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the present invention to the scope of the embodiments described.

[0018] Figure 1 and Figure 2 A lightning protection system for extending wind turbine blades is shown, comprising an extended wind turbine blade 4, a metal mesh 5, a gasket 6, and connecting bolts 7. The metal mesh 5 is laid on the surface of the extended wind turbine blade 4, on both the windward and leeward sides. The system includes the original wind turbine blade 1, a blade tip lightning arrester 2, and a down conductor 3. The blade tip lightning arrester 2 is located at the tip of the original wind turbine blade 1 and is connected to the down conductor 3.

[0019] The system also includes an extended wind turbine blade 4. Both the windward side 401 and the leeward side 402 of the extended wind turbine blade 4 are provided with metal mesh 5. The metal mesh 5 includes a metal foil area 502 at the blade root, a mesh area 501, and a metal foil area 503 at the blade tip. The windward side 401 and the leeward side 402 of the extended wind turbine blade 4 at the blade root metal foil area 502 are respectively connected to the blade tip lightning arrester 2 by connecting bolts 7.

[0020] The metal mesh 5 has a mesh area 501 in the middle part along its length, gradually transitioning to a leaf tip metal foil area 503 at the leaf tip and a leaf root metal foil area 502 at the leaf root. The leaf root metal foil area 502 is semi-circular in shape, and the leaf tip metal foil area 503 is shaped like a leaf tip lightning rod.

[0021] A pair of gaskets 6 are installed in the metal foil area 502 at the leaf root. The metal mesh 5 is sandwiched between the gaskets 6, which are used to strengthen the connection. The connecting bolts 7 are in direct contact with the gaskets 6 on the outside of the metal mesh. At the same time, the connecting bolts 7 are screwed into the original blade tip lightning arrester 2. The metal mesh 5 and the original blade tip lightning arrester 2 are connected and connected through the connecting bolts 7.

[0022] There are two connecting bolts 7, one on the windward side 401 and one on the leeward side 402 of the blade. Before installing the connecting bolts 7, it is necessary to drill and tap holes in the original blade tip lightning rod 2 of the wind turbine blade 1, and then screw the connecting bolts 7 into the original blade tip lightning rod 2.

[0023] When the above technical solution is used, when lightning strikes the extended wind turbine blade metal mesh 5, the current is conducted through the connecting bolt 7 to the original blade tip lightning arrester 2. The original blade tip lightning arrester 2 is connected to the original down conductor 3, and the lightning is finally grounded through the down conductor 3.

[0024] In addition to the above embodiments, the device of this utility model may also have other forms. It should be noted that any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A lightning protection system for extending wind turbine blades, comprising the original wind turbine blade (1), a blade tip lightning arrester (2), and a down conductor (3), characterized in that: The blade tip lightning arrester (2) is installed at the tip of the original wind turbine blade (1), and the blade tip lightning arrester (2) is connected to the down conductor (3); The system also includes an extended wind turbine blade (4), and the windward side (401) and the leeward side (402) of the extended wind turbine blade (4) are both provided with metal mesh (5). The metal mesh (5) includes a metal foil area (502) at the blade root, a mesh area (501) and a metal foil area (503) at the blade tip. The metal foil area (502) at the blade root of the windward side (401) and the leeward side (402) of the extended wind turbine blade (4) is connected to the lightning arrester (2) at the blade tip by connecting bolts (7).

2. The lightning protection system for extending wind turbine blades according to claim 1, characterized in that: The metal mesh (5) has a mesh area (501) in the middle part along its length, gradually becomes a leaf tip metal foil area (503) at the leaf tip, and gradually becomes a leaf root metal foil area (502) at the leaf root.

3. The lightning protection system for extending wind turbine blades according to claim 2, characterized in that: The leaf root metal foil region (502) is semi-circular in shape, and the leaf tip metal foil region (503) is shaped like a leaf tip lightning rod.

4. The lightning protection system for extending wind turbine blades according to claim 3, characterized in that: The leaf root metal foil area (502) is equipped with a gasket (6), which is a pair of upper and lower gaskets, with the metal mesh (5) sandwiched between them. The connecting bolt (7) is directly connected to the gasket (6) on the outside of the metal mesh.

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