Insulation connector and wind turbine

Abstract

The present invention discloses an insulating connector and a wind turbine generator. The insulating connector is used to connect the rotating shaft, rotor support, and flange ring of the wind turbine generator. The flange of the rotor support is clamped between the shaft flange of the rotating shaft and the flange ring. The insulating connector includes a connector and an insulating sleeve. The insulating sleeve is sleeved on the side of the connector. The connector is used to fix the rotor support and the flange ring to the rotating shaft. The insulating sleeve is used to insulate the connector from the rotor support, the rotating shaft, and the flange ring. By configuring the insulating connector to include the connector and the insulating sleeve, the reliability of the connection between the shaft flange, the flange, and the flange ring can be ensured, and the insulation between the connector and the shaft flange of the rotating shaft, the flange of the rotor support, and the flange ring can be ensured, thereby preventing the shaft voltage from forming a path to the ground and thus preventing internal electrical corrosion.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and in particular to an insulating connector and a wind turbine. Background Art

[0002] When a motor's rotor is exposed to an alternating magnetic field or an asymmetric magnetic circuit, it generates shaft voltage across the rotating shaft. This voltage travels through the bearings to ground, causing electrical corrosion. In existing technology, insulating structures are often added to the fixed ring side of the bearing to protect the bearing.

[0003] However, when the motor and converter are connected to the grid, a high-frequency common-mode shaft voltage will be generated on the machine-side winding, and the gearbox will increase the shaft voltage's path to ground. If an insulation structure is added to the fixed ring side, not only will the protection of the generator bearings fail, but the electrical corrosion of the gear tooth surfaces and gear bearings in the gearbox will also increase. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an insulating connector and a wind turbine in order to overcome the defect of electrical corrosion of the bearing of the rotating shaft caused by shaft current generated due to poor insulation effect in the prior art wind turbine.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] An insulating connector is used to connect the rotating shaft, rotor support and flange ring of a wind turbine. The flange of the rotor support is clamped between the shaft flange of the rotating shaft and the flange ring. The insulating connector includes a connector and an insulating sleeve. The insulating sleeve is mounted on the side of the connector. The connector is used to fix the rotor support and the flange ring to the rotating shaft. The insulating sleeve is used to insulate the connector from the rotor support, the rotating shaft and the flange ring.

[0007] In this solution, by adopting the above structure, by setting the insulating connector to include a connector and an insulating sleeve, it can not only ensure the reliability of the connection between the shaft flange, flange plate and flange ring, but also ensure that the connector and the shaft flange of the rotating shaft, the flange plate and flange ring of the rotor bracket are insulated, thereby avoiding the formation of a path of shaft voltage to the ground, and further avoiding electrical corrosion of the bearings of the rotating shaft, the gear tooth surfaces and gear bearings in the gearbox.

[0008] Preferably, two ends of the insulating sleeve are aligned with two ends of the connector.

[0009] In this solution, by adopting the above structure, it is possible to avoid the problem of unstable connection of the insulating connector caused by the insulating sleeve being too long, and it is also possible to avoid the problem of conductivity caused by the connector being too long.

[0010] Preferably, the length of the insulating connector is not less than the sum of the thickness of the flange plate, the thickness of the flange ring and the thickness of the shaft flange.

[0011] In this solution, by adopting the above structure, the length of the insulating connector is not less than the sum of the thickness of the flange, the thickness of the flange ring and the thickness of the shaft flange, thereby ensuring that the insulating connector can more firmly connect the flange, the flange ring and the shaft flange together.

[0012] Preferably, one end of the insulating sleeve has a flange portion, and the flange portion extends outward from the outer side surface of the insulating sleeve along the radial direction of the rotating shaft.

[0013] In this solution, by adopting the above structure, the eaves can be used as an insulating connector to be inserted into the stop of the installation hole. When the eaves are tightly against the flange ring, the insulating connector reaches the installation position.

[0014] A wind turbine, comprising an insulating assembly, wherein the insulating assembly comprises the insulating connector as described above. The wind turbine also comprises a rotating shaft, a rotor support and a flange ring, wherein the flange of the rotor support is clamped between the shaft flange of the rotating shaft and the flange ring, and the insulating connector is inserted into the mounting holes of the flange, the flange ring and the shaft flange.

[0015] In this solution, by adopting the above structure, the wind turbine can avoid the shaft voltage from forming a path to the ground by arranging the insulating component including the insulating connector between the rotating shaft, the rotor bracket and the flange ring, thereby avoiding electrical corrosion of the bearings of the rotating shaft, the gear tooth surfaces in the gearbox and the gear bearings.

[0016] Preferably, the insulating assembly further comprises an insulating gasket, which is arranged between the shaft flange and the flange plate and between the flange plate and the flange ring, and is used to insulate the rotating shaft and the rotor bracket axially and radially along the rotating shaft.

[0017] In this solution, by adopting the above structure, the rotating shaft and the rotor bracket are insulated axially and radially by using insulating pads, which can further prevent the shaft voltage from forming a path to the ground, and thus prevent electrical corrosion of the bearings of the rotating shaft, the gear tooth surfaces in the gearbox and the gear bearings.

[0018] Preferably, the flange has an insertion section and a protruding section, the protruding section extends outward from two side surfaces of the insertion section, the insertion section is located between the shaft flange and the flange ring, and the inner side surface of the protruding section faces the outer side surface of the shaft flange and the outer side surface of the flange ring; the insulating gasket has a radial section and an axial section connected to each other, the radial section is clamped between the shaft flange and the insertion section and between the insertion section and the flange ring; the axial section is clamped between the shaft flange and the protruding section and between the flange ring and the protruding section.

[0019] In this solution, by adopting the above structure, the insulating pad is configured to include a radial section and an axial section, and the radial section and the axial section enable more reliable insulation between the flange and the shaft flange and the flange ring.

[0020] Preferably, the thickness of the axial section is greater than the thickness of the radial section.

[0021] In this solution, by adopting the above structure, the axial section with a larger thickness can better adapt to the radial clearance fit between the flange plate, the shaft flange, and the flange ring, and can avoid radial shaking.

[0022] Preferably, the insulating assembly further includes an insulating cylinder, and the insulating cylinder is arranged in the mounting hole of the flange.

[0023] In this solution, by adopting the above structure, the insulating tube can avoid the conductive problem of the mounting hole of the flange.

[0024] Preferably, the wind turbine further comprises bolts, the bolts are passed through mounting holes of the flange plate, the flange ring and the shaft flange, and the insulating sleeve is sleeved on the bolts.

[0025] In this solution, by adopting the above structure, the insulating cylinder can prevent the bolts from conducting the flange and the shaft flange, thereby preventing the shaft voltage from forming a path to the ground.

[0026] The positive progress effect of the present invention is:

[0027] By setting the insulating connector to include a connector and an insulating sleeve, the reliability of the connection between the shaft flange, flange plate and flange ring can be guaranteed, and the connector can be insulated from the shaft flange of the rotating shaft, the flange plate and flange ring of the rotor bracket, thereby avoiding the formation of a path of shaft voltage to the ground, and further avoiding electrical corrosion of the bearings of the rotating shaft, the gear tooth surfaces and gear bearings in the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of a partial wind turbine according to a preferred embodiment of the present invention.

[0029] Figure 2 for Figure 1 Schematic diagram of the structure of the wind turbine in direction A.

[0030] Figure 3 for Figure 2 Schematic diagram of the structure of a wind turbine viewed from the center along line AA.

[0031] Figure 4 for Figure 2 Schematic diagram of the structure of the wind turbine A viewed from the center BB.

[0032] Description of reference numerals:

[0033] Wind turbine 100

[0034] Rotation axis 11

[0035] Shaft flange 111

[0036] Rotor bracket 12

[0037] Flange 121

[0038] Insert 122

[0039] Protruding section 123

[0040] Flange ring 13

[0041] Bolt 14

[0042] Gearbox 15

[0043] Planetary gear 151

[0044] Sun gear 152

[0045] Rotor 16

[0046] Winding 17

[0047] Bearing 18

[0048] Insulating connector 20

[0049] Connector 21

[0050] Insulation sleeve 22

[0051] Eaves 221

[0052] Insulation component 30

[0053] Insulation pad 31

[0054] Radial section 311

[0055] Axial section 312

[0056] Insulation tube 32 DETAILED DESCRIPTION

[0057] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0058] like Figure 1-Figure 4 As shown, this embodiment provides a wind turbine 100, which includes an insulating assembly 30, which includes an insulating connector 20 as described below. The wind turbine 100 also includes a rotating shaft 11, a rotor bracket 12, and a flange ring 13. The flange 121 of the rotor bracket 12 is sandwiched between the shaft flange of the rotating shaft 11 and the flange ring 13, and the insulating connector 20 is inserted into the mounting holes of the flange 121, the flange ring 13, and the shaft flange 111. By arranging the insulating assembly 30 including the insulating connector 20 between the rotating shaft 11, the rotor bracket 12, and the flange ring 13, the wind turbine 100 can prevent the shaft voltage from forming a path to the ground, thereby preventing electrical corrosion of the bearing 18 of the rotating shaft 11, the tooth surface of the internal gear of the gearbox 15, and the gear bearing 18.

[0059] exist Figure 1 The figure also shows a gearbox 15, a rotor 16, a winding 17, and the like. The gearbox 15 is provided with planetary gears 151 and a sun gear 152. In this embodiment, the gearbox 15 is an integrated structure, which effectively reduces the shaft current flowing through the bearing 18, the meshing surfaces of the planetary gears 151 and the sun gear 152, and the gear bearing 18, thereby preventing electrical corrosion.

[0060] like Figure 3 As shown in the figure, an insulating connector 20 is included, which is used to connect the rotating shaft 11, the rotor bracket 12 and the flange ring 13 of the wind turbine 100. The flange plate 121 of the rotor bracket 12 is clamped between the shaft flange 111 of the rotating shaft 11 and the flange ring 13. The insulating connector 20 includes a connector 21 and an insulating sleeve 22. The insulating sleeve 22 is sleeved on the side of the connector 21. The connector 21 is used to fix the rotor bracket 12 and the flange ring 13 to the rotating shaft 11. The insulating sleeve 22 is used to insulate the rotating shaft 11 and the rotor bracket 12 along the radial direction of the rotating shaft 11. By configuring the insulating connector 20 to include a connector 21 and an insulating sleeve 22, the reliability of the connection between the shaft flange 111, the flange plate 121 and the flange ring 13 can be ensured, and the connector 21 can be insulated from the shaft flange 111 of the rotating shaft 11, the flange plate 121 and the flange ring 13 of the rotor bracket 12, thereby avoiding the formation of a path for the shaft voltage to the ground, and further avoiding electrical corrosion of the bearing 18 of the rotating shaft 11, the gear tooth surface in the gearbox 15 and the gear bearing 18.

[0061] Combine Figure 3The insulating connector 20 is inserted into the mounting hole between the shaft flange 111, the flange plate 121, and the flange ring 13. The insulating sleeve 22 covers the side of the connector 21, thereby insulating the connector 21 from the shaft flange 111, the flange plate 121, and the flange ring 13. As a result, in the radial direction of the rotating shaft 11, current cannot flow through the shaft flange 11, the connector 21, and the flange plate 121 in sequence, thereby achieving radial insulation of the rotor bracket 12 along the rotating shaft 11.

[0062] The two ends of the insulating sleeve 22 are aligned with the two ends of the connector 21 , which can avoid the problem of unstable connection of the insulating connector 20 caused by the insulating sleeve 22 being too long, and can also avoid the problem of conductivity caused by the connector 21 being too long.

[0063] The length of the insulating connector 20 is not less than the sum of the thicknesses of the flange 121, the flange ring 13, and the shaft flange 111. By ensuring that the length of the insulating connector 20 is not less than the sum of the thicknesses of the flange 121, the flange ring 13, and the shaft flange 111, the insulating connector 20 can more securely connect the flange 121, the flange ring 13, and the shaft flange 111.

[0064] One end of the insulating sleeve 22 has a flange 221 extending radially outward from the outer side of the insulating sleeve 22 along the rotating shaft 11. The flange 221 serves as a stop for inserting the insulating connector 20 into the mounting hole. When the flange 221 abuts against the flange ring 13, the insulating connector 20 is installed. The flange 221 can be annular or have other shapes, such as serrated or wavy.

[0065] In one embodiment, connector 21 may be a shear pin, which may be a cylindrical alloy steel member. Insulation sleeve 22 may be cylindrical, with connector 21 inserted into cylindrical insulation sleeve 22. Rotor support 12 is subject to alternating stress, and the use of shear pins can reduce the stress on insulation assembly 30.

[0066] In this embodiment, the insulation assembly 30 further includes an insulating gasket 31, which is disposed between the shaft flange 111 and the flange plate 121, and between the flange plate 121 and the flange ring 13. The insulating gasket 31 is used to insulate the rotating shaft 11 and the rotor support 12 axially and radially. The insulating gasket 31 may be an annular gasket disposed between the shaft flange 111 and the flange plate 121, and between the flange plate 121 and the flange ring 13. Using the insulating gasket 31 to insulate the rotating shaft 11 and the rotor support 12 axially and radially can further prevent the formation of a shaft voltage path to ground, thereby preventing electrical corrosion of the bearings 18 of the rotating shaft 11, the gear tooth surfaces within the gearbox 15, and the gear bearings 18.

[0067] The flange 121 includes an inserting section 122 and a protruding section 123. The protruding section 123 extends outward from both sides of the inserting section 122. The inserting section 122 is located between the shaft flange 111 and the flange ring 13, and the inner side of the protruding section 123 faces the outer sides of the shaft flange 111 and the flange ring 13. The insulating plate 31 includes a radial section 311 and an axial section 312. The radial section 311 is sandwiched between the shaft flange 111 and the inserting section 122, and between the inserting section 122 and the flange ring 13. The axial section 312 extends between the shaft flange 111 and the protruding section 123, and between the flange ring 13 and the protruding section 123. The insulating plate 31 includes the radial section 311 and the axial section 312, which provide more reliable insulation between the flange 121, the shaft flange 111, and the flange ring 13. The cross section of the inner end of the flange 121 may be T-shaped as a whole, the insertion section 122 may be the vertical portion at the lower portion of the T-shape, and the protruding section 123 may be the horizontal portion at the upper portion of the T-shape.

[0068] The thickness of the axial section 312 is greater than that of the radial section 311. The thicker axial section 312 can better adapt to the radial clearance fit between the flange 121, the shaft flange 111, and the flange ring 13, thereby preventing radial shaking.

[0069] In this embodiment, the insulating pad 31 can be annular as a whole, the cross-section of the insulating pad 31 can be L-shaped, the axial section 312 and the radial section 311 can be specifically annular, the axis of the axial section 312 is parallel to the axis of the rotating shaft 11, and the radial section 311 extends radially along the rotating shaft 11.

[0070] The insulating assembly 30 further includes an insulating tube 32, which is disposed in the mounting hole of the flange 121. The insulating tube 32 can avoid the conductive problem in the mounting hole of the flange 121.

[0071] Wind turbine 100 further includes bolts 14, which are inserted through mounting holes in flange 121, flange ring 13, and shaft flange 111. Insulation tubes 32 are sleeved over bolts 14. Insulation tubes 32 prevent bolts 14 from conducting electricity between flange 121 and shaft flange 111, thereby preventing shaft voltage from forming a path to ground.

[0072] The insulating sleeve 22 , the insulating pad 31 , and the insulating tube 32 may all be made of laminated insulating board or nylon.

[0073] In this embodiment, the rotor frame 12 of the wind turbine 100 is the main path for shaft current. By adding an insulation assembly 30 to the rotor frame 12, the insulation assembly 30 effectively insulates the end faces and stoppers of the shaft flange 111, flange ring 13, and flange plate 121, as well as the connecting bolts 14 and pins. The insulation assembly 30 adds a significant capacitive reactance, reducing all shaft currents flowing through the meshing surfaces between the bearing 18 and the sun gear 152 and planetary gears 151.

[0074] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A wind turbine, characterized in that: It includes an insulating component, a rotating shaft, a rotor bracket and a flange ring, wherein the insulating component includes an insulating connector and an insulating cylinder; The insulating connector is used to connect the rotating shaft, the rotor bracket and the flange ring. The flange of the rotor bracket is clamped between the shaft flange of the rotating shaft and the flange ring. The insulating connector is inserted into the mounting holes of the flange, the flange ring and the shaft flange. The insulating connector includes a connector and an insulating sleeve. The insulating sleeve is sleeved on the side of the connector. The connector is used to fix the rotor bracket and the flange ring to the rotating shaft. The insulating sleeve is used to insulate the connector from the rotor bracket, the rotating shaft and the flange ring. There are multiple insulating connectors, and the multiple insulating connectors are symmetrical about the axis center of the rotating shaft. The insulating tube is arranged in the mounting hole of the flange plate. The wind turbine also includes bolts, which are passed through the mounting holes of the flange plate, the flange ring and the shaft flange. The insulating tube is sleeved on the bolts. The insulating connector and the insulating tube are respectively arranged in different mounting holes of the flange plate.

2. The wind turbine according to claim 1, wherein: Two ends of the insulating sleeve are aligned with two ends of the connector.

3. The wind turbine according to claim 1, wherein: The length of the insulating connector is not less than the sum of the thickness of the flange plate, the thickness of the flange ring and the thickness of the shaft flange.

4. The wind turbine according to claim 1, wherein: One end of the insulating sleeve has an eaves portion, and the eaves portion extends outward from the outer side surface of the insulating sleeve along the radial direction of the rotating shaft.

5. The wind turbine according to any one of claims 1 to 4, characterized in that: The insulating assembly further includes an insulating gasket, which is disposed between the shaft flange and the flange plate and between the flange plate and the flange ring. The insulating gasket is used to insulate the rotating shaft and the rotor bracket axially and radially along the rotating shaft.

6. The wind turbine according to claim 5, wherein: The flange plate has an insertion section and a protruding section, the protruding section extends outward from two side surfaces of the insertion section, the insertion section is located between the shaft flange and the flange ring, and the inner side surface of the protruding section faces the outer side surface of the shaft flange and the outer side surface of the flange ring; the insulating gasket has a radial section and an axial section connected to each other, the radial section is clamped between the shaft flange and the insertion section and between the insertion section and the flange ring; the axial section is clamped between the shaft flange and the protruding section and between the flange ring and the protruding section.

7. The wind turbine according to claim 6, wherein: The thickness of the axial section is greater than the thickness of the radial section.

Images