Wind power blade grounding device

Abstract

The utility model relates to a wind power blade grounding device which comprises a conducting ring and a wind power blade transmission shaft, the conducting ring is fixedly installed on the outer wall of the wind power blade transmission shaft, a grounding pole is fixedly installed in the middle of the fixing plate, and one end, penetrating through the fixing plate, of the grounding pole is electrically connected with a conducting wire through a threaded connection assembly. A carbon brush is fixedly installed at one end of the conductive wire and abuts against and is matched with the conductive ring through an elastic supporting component, and current generated on the transmission shaft of the wind power blade is transmitted to the ground through the conductive wire and the grounding column. The beneficial effects of the utility model are that the conductive ring is fixedly installed on the transmission shaft of the wind power blade, the generated current is transmitted to the ground through the conductive ring, the carbon brush, the conductive wire and the grounding pole, the conductive wire is connected with the grounding pole through the threaded connection assembly, the dismounting and maintenance are convenient, and the hook spring can provide elastic potential energy for the driving arm. And the driving arm pushes the carbon brush to tightly contact with the conductive ring, so that the stability of electric transmission is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power generation, in particular to a wind turbine blade grounding device. Background Art

[0002] In the prior art, in order to transfer the current when the tip of a wind turbine blade is struck by lightning to the ground in time, a corresponding grounding device is usually required to be provided at the root of the blade. In a doubly-fed wind turbine generator set, since a frequency converter is used to supply power to the rotor winding, a shaft voltage is inevitably generated on the shaft. If no measures are taken, a shaft current will be generated through the bearing. In order to prevent electrical corrosion from occurring, a grounding device is provided on the upper part of the shaft in a doubly-fed wind turbine generator set.

[0003] The traditional grounding device generally sets a brush at the shaft position, and then the brush is grounded. After the shaft generates current, the current can be conducted through the carbon brush and the wire to complete the unloading. However, after long-term use, the carbon brush will be worn out, resulting in unstable current conduction. For this reason, we have improved this and proposed a wind turbine blade grounding device. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In order to solve the above problems in the prior art, the utility model provides a wind turbine blade grounding device, which can achieve stable conduction between the carbon brush and the shaft structure.

[0006] (II) Technical solution

[0007] In order to achieve the above purpose, the main technical solutions adopted by the utility model are:

[0008] A wind turbine blade grounding device comprises a conductive ring and a wind turbine blade drive shaft, wherein the conductive ring is fixedly mounted on the outer wall of the wind turbine blade drive shaft, and further comprises a fixed plate, wherein a grounding column is fixedly mounted on the middle part of the fixed plate, wherein one end of the grounding column passes through the fixed plate and is electrically connected to a conductive wire via a threaded connection assembly, wherein a carbon brush is fixedly mounted on one end of the conductive wire, wherein the carbon brush is in contact with the conductive ring via an elastic supporting component, and the current generated on the wind turbine blade drive shaft is transmitted to the earth via the conductive wire and the grounding column.

[0009] The threaded connection assembly comprises a threaded joint fixedly mounted on a fixing plate and a threaded cap sleeved on the conductive wire. The threaded cap and the threaded joint are threadedly connected to make the conductive wire contact and connect with the grounding column.

[0010] The grounding column and the conductive ring are both made of conductive metal.

[0011] The elastic supporting component comprises a retaining frame, the bottom of the retaining frame is rotatably connected to a driving arm via a rotating shaft, one end of the driving arm is detachably connected to a carbon brush, and the driving arm is elastically matched with the retaining frame.

[0012] The carbon brush is detachably connected to the driving arm via a bolt, and one end of the bolt that penetrates the carbon brush and the driving arm is fixed via a nut thread.

[0013] A hook spring is clamped on one side of the retaining frame, and one end of the hook spring is clamped and fixed to the driving arm.

[0014] A fixing hole is formed on the side wall of the retaining frame, a fixing screw is inserted into the inner wall of the fixing hole, and one end of the fixing screw is inserted into the fixing hole and fixedly connected to the inner wall of the wind turbine blade gear box.

[0015] (III) Beneficial effects

[0016] The beneficial effects of the utility model are as follows: through the arrangement of a grounding column, a threaded connection assembly, a conductive wire, an elastic supporting component and a conductive ring, the conductive ring is fixedly installed on the wind turbine blade drive shaft, the generated current is transmitted to the earth through the conductive ring, the carbon brush, the conductive wire and the grounding column, the conductive wire is connected to the grounding column through the threaded connection assembly, which is convenient for disassembly and maintenance, and at the same time the hook spring can provide elastic potential energy for the driving arm, so that the driving arm pushes the carbon brush to closely contact the conductive ring, thereby ensuring the stability of electrical transmission, and when the carbon brush is damaged, the bolt can be removed to replace the carbon brush. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the utility model in use state;

[0018] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 3 It is a schematic diagram of the local structure of the utility model;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model.

[0021] [Description of Reference Numerals]

[0022] 1. Conductive ring; 2. Wind turbine blade transmission shaft; 3. Fixed plate; 4. Grounding column; 5. Conductive wire; 6. Carbon brush; 7. Elastic supporting component; 71. Retaining frame; 72. Rotating shaft; 73. Driving arm; 74. Bolt; 75. Hook spring; 76. Fixing hole; 77. Fixing screw; 8. Threaded connection assembly; 81. Threaded joint; 82. Threaded cap. DETAILED DESCRIPTION

[0023] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0024] Please refer to Figures 1 to 4 As shown, a wind turbine blade grounding device of the utility model includes a conductive ring 1 and a wind turbine blade transmission shaft 2. The conductive ring 1 is fixedly mounted on the outer wall of the wind turbine blade transmission shaft 2, and also includes a fixing plate 3. A grounding column 4 is fixedly mounted in the middle of the fixing plate 3. The grounding column 4 passes through one end of the fixing plate 3 and is electrically connected to a conductive wire 5 through a threaded connection component 8. A carbon brush 6 is fixedly mounted on one end of the conductive wire 5. The carbon brush 6 is in contact with the conductive ring 1 through an elastic support component 7. The current generated on the wind turbine blade transmission shaft 2 is transmitted to the earth through the conductive wire 5 and the grounding column 4. In the actual implementation process, the grounding column 4 is fixed to the ground through the fixing plate 3, and the grounding column is mixed into the ground. The conductive ring 1 is fixedly mounted on the wind turbine blade transmission shaft 2. The generated current is transmitted to the carbon brush 6 through the conductive ring 1, and further transmitted to the grounding column 4 and the earth through the conductive wire 5.

[0025] Optionally, the threaded connection assembly 8 includes a threaded joint 81 fixedly mounted on the fixing plate 3 and a threaded cap 82 sleeved on the conductive wire 5, and the threaded cap 82 is threadedly connected with the threaded joint 81 so that the conductive wire 5 is in contact with the grounding column 4. In the actual implementation process, the threaded cap 82 is used for threaded fixing, and when damaged, the threaded cap can be removed to replace the conductive wire 5 or the grounding column 4.

[0026] Optionally, the grounding column 4 and the conductive ring 1 are both made of conductive metal. In actual implementation, the grounding column 4 and the conductive ring 1 made of conductive metal can ensure the stability of point transmission.

[0027] Optionally, the elastic support component 7 includes a holder 71, the bottom of the holder 71 is rotatably connected to a driving arm 73 via a rotating shaft 72, one end of the driving arm 73 is detachably connected to the carbon brush 6, and the driving arm 73 is elastically matched with the holder 71. In actual implementation, the rotating shaft 72 is a horizontal rotating shaft arranged in the middle of the driving arm 73, and the rotating shaft 72 is rotatably connected to the holder 71.

[0028] Optionally, the carbon brush 6 is detachably connected to the driving arm 73 via a bolt 74, and one end of the bolt 74 penetrates into the carbon brush 6 and the driving arm 73 and is fixed by a nut thread. In actual implementation, the carbon brush 6 can be removed by removing the bolt 74, and the carbon brush 6 can be replaced. After the replacement is completed, the bolt 74 is penetrated into the carbon brush 6 and the driving arm 73 and then threadedly connected with the nut to fix it.

[0029] Optionally, a hook spring 75 is clamped on one side of the retaining frame 71, and one end of the hook spring 75 is clamped and fixed to the driving arm 73. In the actual implementation process, the hook spring 75 is in a stretched state after installation, and the hook spring 75 can pull the driving arm 73. The elastic potential energy of the hook spring 75 of the driving arm 73 will push the carbon brush 6 to fit closely on the conductive ring 1, ensuring that the current on the wind turbine blade transmission shaft 2 can be effectively transmitted to the ground.

[0030] Optionally, a fixing hole 76 is formed on the side wall of the retaining frame 71, and a fixing screw 77 is inserted into the inner wall of the fixing hole 76. One end of the fixing screw 77 is inserted into the fixing hole 76 and fixedly connected to the inner wall of the wind turbine blade gearbox. In the actual implementation process, the fixing screw 77 can be fixed to the fixed object after being inserted into the fixing hole 76, so that it is convenient to fix the components on the entire retaining frame 71 and ensure the stability of the entire device.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model, and the standard parts used in the utility model can be purchased from the market, special-shaped parts can be customized according to the description and the drawings, and the specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0032] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A wind turbine blade grounding device, comprising a conductive ring (1) and a wind turbine blade transmission shaft (2), wherein the conductive ring (1) is fixedly mounted on the outer wall of the wind turbine blade transmission shaft (2), and is characterized in that: It also includes a fixing plate (3), a grounding column (4) is fixedly installed in the middle of the fixing plate (3), one end of the grounding column (4) passes through the fixing plate (3) and is electrically connected to a conductive wire (5) through a threaded connection component (8), one end of the conductive wire (5) is fixedly installed with a carbon brush (6), the carbon brush (6) is in contact with the conductive ring (1) through an elastic support component (7), and the current generated on the wind turbine blade transmission shaft (2) is transmitted to the ground through the conductive wire (5) and the grounding column (4).

2. A wind turbine blade grounding device according to claim 1, characterized in that: The threaded connection assembly (8) comprises a threaded joint (81) fixedly mounted on a fixing plate (3) and a threaded cap (82) sleeved on the conductive wire (5); the threaded cap (82) and the threaded joint (81) are threadedly connected so that the conductive wire (5) is contact-connected with the grounding column (4).

3. A wind turbine blade grounding device according to claim 2, characterized in that: The grounding column (4) and the conductive ring (1) are both made of conductive metal.

4. A wind turbine blade grounding device according to claim 1, characterized in that: The elastic support component (7) comprises a retaining frame (71), the bottom of the retaining frame (71) is rotatably connected to a driving arm (73) via a rotating shaft (72), one end of the driving arm (73) is detachably connected to the carbon brush (6), and the driving arm (73) is elastically matched with the retaining frame (71).

5. A wind turbine blade grounding device according to claim 4, characterized in that: The carbon brush (6) is detachably connected to the driving arm (73) via a bolt (74); one end of the bolt (74) penetrates into the carbon brush (6) and the driving arm (73) and is fixed via a nut thread.

6. A wind turbine blade grounding device according to claim 4, characterized in that: A hook spring (75) is clamped on one side of the retaining frame (71), and one end of the hook spring (75) is clamped and fixed to the driving arm (73).

7. A wind turbine blade grounding device according to claim 4, characterized in that: A fixing hole (76) is provided on the side wall of the retaining frame (71), a fixing screw (77) is inserted into the inner wall of the fixing hole (76), and one end of the fixing screw (77) is inserted into the fixing hole (76) and fixedly connected to the inner wall of the wind turbine blade gear box.

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