Wind power yaw cable release device

Abstract

The application relates to a wind power yaw cable disconnector, and relates to the technical field of wind power equipment, which comprises a stator part, a rotor part and a connecting contact finger for connecting the stator part and the rotor part, the connecting contact finger is arranged as a ring-shaped flexible structure, is connected between the stator part and the rotor part, realizes the rotating conductive connection between the stator part and the rotor part, the connecting contact finger is arranged as a circular ring-shaped watchband contact finger, a ring-shaped through groove is distributed on the connecting contact finger, the middle part of the connecting contact finger is protruded to the inner side, and a plurality of protruding blocks for positioning the connecting contact finger are arranged on the side surface of the connecting contact finger and the stator slide. The original cable twisting is removed, the twisting action is connected through the cable disconnector, there is no cable disconnection, unrestricted yaw is realized in the whole process, cable wear and other problems are fundamentally solved, the available hours and the power generation of the wind turbine are improved, the risk and hidden trouble problems of the existing yaw power collecting ring are solved, and the performance and safety of the wind turbine generator are improved.

Description

Technical Field

[0001] This application relates to the technical field of wind power equipment, and in particular to a wind power yaw unloader. Background Technology

[0002] In wind turbine generator systems, wind turbines need to yaw against the wind. Traditional nacelle yaw methods suffer from problems such as power cable twisting, cable wear, and cable slippage. Moreover, as the power of the units continues to increase, the generator-side voltage is limited, generally not exceeding 1140V. Therefore, regardless of whether it is a doubly-fed, direct-drive, or semi-direct-drive unit, the number and diameter of the main cables have increased dramatically. This significantly increases the requirements for cable yaw, cable unwinding, and cost.

[0003] To address these issues, the industry has begun using yaw slip rings to replace traditional twisted cable designs in recent years. Yaw slip rings are devices that use carbon brushes for mechanical contact, similar to traditional generator slip rings, to transmit high-voltage electrical energy. Because electrical contact and energy transmission are achieved through a sliding mechanism between carbon brushes and slotted circular tracks, there are technical risks and safety hazards such as inconsistent contact performance leading to uneven current distribution between carbon brushes, high contact resistance, high heat generation, and high-voltage arcing due to poor contact. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a wind turbine yaw unloader that removes the original cable twisting. The twisting action is connected through the unloader, and the cable does not participate in the twisting. Without unloading, it achieves unrestricted yaw throughout the entire process, thereby fundamentally solving problems such as cable wear, increasing the wind turbine's available hours and power generation, and also solving the risks and hidden dangers of existing yaw collector rings, thus improving the performance and safety of wind turbine units.

[0005] The wind power yaw unloader provided in this application adopts the following technical solution: A wind turbine yaw unloader includes a stator section, a rotor section, and connecting fingers for connecting the stator section and the rotor section. The connecting fingers are configured as a ring-shaped flexible structure and are connected between the stator section and the rotor section to achieve a rotational conductive connection between the stator section and the rotor section.

[0006] As a preferred technical solution of this application, the stator part includes a support frame, a plurality of stator support columns connected inside the support frame, a plurality of stator slides connected to the stator support columns, and an external power busbar connected to the stator slides. The top of the support frame is provided with a mounting hole for mounting the rotor part, and the rotor part enters the rotor part through the mounting hole.

[0007] As a preferred technical solution of this application, the rotor part includes a shaft tube, an upper rotating cylinder connected to the upper end of the shaft tube, a yaw fork connected to the upper end of the upper rotating cylinder, a rotor slip ring disposed outside the shaft tube, and a rotor connecting row connected to the rotor slip ring. The rotor part is rotatably connected to the support frame through the shaft tube and the upper rotating cylinder, and the stator slide is correspondingly disposed with the rotor slip ring.

[0008] As a preferred technical solution of this application, the bottom of the support frame is provided with a shaft tube connecting positioning plate, and the shaft tube is rotatably connected to the shaft tube connecting positioning plate.

[0009] As a preferred technical solution of this application, the connecting finger is configured as a ring-shaped watch strap finger, with a ring of through grooves distributed on the connecting finger, and the middle part of the connecting finger protrudes inward.

[0010] As a preferred technical solution of this application, the side of the stator slide that contacts the connecting finger is provided with a plurality of protrusions for positioning the connecting finger.

[0011] As a preferred technical solution of this application, the connecting contact finger is configured as a circular spring contact finger.

[0012] As a preferred technical solution of this application, the stator slide or rotor slip ring has a groove on the side that contacts the connecting finger for positioning the connecting finger.

[0013] As a preferred technical solution of this application, the rotor part further includes an upper bearing disk and a lower bearing disk connected to the shaft tube, and a plurality of rotor support columns are connected between the upper bearing disk and the lower bearing disk.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. Due to the extremely low yaw speed of wind turbines, the flexible contact technology, acting as an elastic current-carrying bridge conductor, is ideally suited for applications involving vibration, dynamic conditions, and impact loads. Its unique continuous contact conductive structure design results in extremely low contact resistance, eliminating the risk of discharge due to poor contact during operation. Furthermore, the extremely low contact power consumption reduces system heat generation, making it highly suitable for conducting high-voltage, high-current applications under low-speed relative motion. This solution addresses the problems of intermittent contact, discharge, and high heat generation associated with conventional carbon brush slip rings, improving the product's power transmission efficiency, safety, and reliability.

[0015] 2. The DC resistance between the stator and rotor ring channels in this application can stably reach several μΩ, while the contact resistance of the carbon brush structure is in the hundreds of μΩ or even mΩ. Therefore, the power consumption can be greatly reduced under the same current. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of the device in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the stator portion in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the rotor portion in Embodiment 1 of this application; Figure 4 This is a schematic diagram of the structure of the connecting fingers in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the connection structure between the stator slide and the rotor slip ring in Embodiment 1 of this application; Figure 6 This is a schematic diagram of the structure of the connecting fingers in Embodiment 2 of this application; Figure 7 This is a schematic diagram of the connection structure between the stator slide and the rotor slip ring in Embodiment 2 of this application;

[0017] In the diagram, 1. Connecting contact finger; 2. Support frame; 3. Stator support column; 4. Stator slide rail; 5. External power busbar; 6. Mounting hole; 7. Shaft tube; 8. Upper rotating cylinder; 9. Yaw fork; 10. Rotor slip ring; 11. Rotor connecting bar; 12. Shaft tube connecting positioning plate; 13. Protrusion; 14. Groove; 15. Upper bearing plate; 16. Lower bearing plate; 17. Rotor support column. Detailed Implementation

[0018] To make the technical problems solved, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0019] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0020] Example 1: This application proposes a wind turbine yaw unloader, referring to... Figure 1-5 The device includes a stator section, a rotor section, and a connecting contact 1, which is electrically connected between the stator section and the rotor section.

[0021] The stator section includes a support frame 2, stator support columns 3, stator slide rails 4, and external power busbars 5. The support frame 2 is a rectangular frame composed of beams and columns, with protective baffles on each side. A circular mounting hole 6 is located in the center of the top protective baffle, through which the rotor is installed into the stator section. A shaft tube connecting positioning plate 12 is mounted on the bottom baffle of the support frame 2, with a circular positioning groove at its center. The stator support columns 3 are connected inside the support frame. In this embodiment, three stator support columns 3 are arranged in parallel, forming a triangular distribution. The upper and lower ends of each stator support column 3 are connected to the top and bottom baffles of the support frame 2, respectively. The stator slide rails 4 are annular. In this embodiment, multiple stator slide rails 4 are installed at intervals along the vertical direction on the three stator support columns 3. The stator slide rails 4 are connected to connecting fingers 1 via their inner rings. Each stator slide rail 4 is connected to two external power busbars 5.

[0022] The rotor assembly includes a shaft tube 7, an upper rotating cylinder 8, a yaw fork 9, a rotor slip ring 10, a rotor connecting bar 11, an upper bearing disc 15, a lower bearing disc 16, and a rotor support column 17. The shaft tube 7 is a circular tube, with its lower end rotatably connected to a positioning groove in the center of the shaft tube connecting positioning disc 12, and its upper end rotatably connected to the support frame 2 via bearings. The upper rotating cylinder 8 is coaxially connected to the upper end of the shaft tube 7 and protrudes from the upper end of the support frame 2. A flange is connected to the upper end of the upper rotating cylinder 8, and the yaw fork 9 is connected to the flange. The yaw of the unit provides rotational power, and a power rod is connected to the yaw fork 9.

[0023] An annular upper bearing disc 15 is fixedly connected to the outer side of the upper end of the shaft tube 7, and an annular lower bearing disc 16 is fixedly connected to the outer side of the shaft tube 7 near the lower end. Three parallel rotor support columns 17 are connected between the upper bearing disc 15 and the lower bearing disc 16, and the three rotor support columns 17 are distributed in a triangular pattern. Several rotor slip rings 10 are provided and are installed at intervals along the vertical direction on the three rotor support columns 17. The rotor slip rings 10 are sleeved on the outside of the shaft tube 7, and the outer side of the rotor slip ring 10 is opposite to the inner side of the stator slide 4. The connecting finger 1 is provided between the outer side of the rotor slip ring 10 and the inner side of the stator slide 4.

[0024] In this embodiment, the connecting finger 1 is configured as a ring-shaped watchband contact finger. A ring of through grooves is distributed on the connecting finger 1. The middle part of the connecting finger 1 protrudes towards the rotor slip ring 10. Several spaced protrusions 13 are provided on the side of the stator slide 4 that contacts the connecting finger 1. The protrusions 13 are used to position and hold the connecting finger 1 to prevent it from falling off. The upper and lower sides of the connecting finger 1 abut against the inner ring of the stator slide 4, and the inwardly protruding part of the connecting finger 1 abuts against the outer ring of the rotor slip ring 4.

[0025] Example 2: Refer to Figure 6-7The difference between this embodiment and Embodiment 1 is that in this embodiment, the connecting contact finger 1 is set as a ring-shaped spring contact finger. A groove 14 is provided on the side of the stator slide 4 or rotor slip ring 10 that contacts the connecting contact finger 1. In this embodiment, the groove 14 is provided on the inner side of the stator slide 4. The groove 14 is used to position the connecting contact finger 1. The inner side of the connecting contact finger 1 is sleeved on the rotor slip ring 10, and the outer side is stuck in the groove 14.

[0026] The implementation principle of this application is as follows: the yaw of the unit provides rotational power, and the power plug is connected to the yaw fork 9 of the rotor part of the yaw unloader. When the wind turbine yaws, the yaw fork 9 drives the upper rotating cylinder 8 of the rotor part to rotate. The upper rotating cylinder 8 is fixed on the shaft tube 7, which drives the rotor slip ring 10 to rotate. The rotor slip ring 10 uses flexible connection contact finger technology, including watch strap contact fingers and spring contact fingers, to achieve rotational conductive connection with the stator slide 4 of the outer ring.

[0027] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wind turbine yaw unloader, characterized in that, It includes a stator section, a rotor section, and a connecting finger (1) for connecting the stator section and the rotor section. The connecting finger (1) is set as a ring-shaped flexible structure and is connected between the stator section and the rotor section to realize the rotational conductive connection between the stator section and the rotor section.

2. A wind turbine yaw unloader according to claim 1, characterized in that, The stator section includes a support frame (2), several stator support columns (3) connected inside the support frame (2), several stator slides (4) connected to the stator support columns (3), and an external power busbar (5) connected to the stator slides (4). The top of the support frame (2) is provided with mounting holes (6) for mounting the rotor section. The rotor section enters the rotor section through the mounting holes (6).

3. A wind turbine yaw unloader according to claim 2, characterized in that, The rotor part includes a shaft tube (7), an upper rotating cylinder (8) connected to the upper end of the shaft tube (7), a yaw fork (9) connected to the upper end of the upper rotating cylinder (8), a rotor slip ring (10) set outside the shaft tube (7), and a rotor connecting row (11) connected to the rotor slip ring (10). The rotor part is rotatably connected to the support frame (2) through the shaft tube (7) and the upper rotating cylinder (8). The stator slide (4) is correspondingly set with the rotor slip ring (10).

4. A wind turbine yaw unloader according to claim 3, characterized in that, The bottom of the support frame (2) is provided with a shaft tube connecting positioning plate (12), and the shaft tube (7) is rotatably connected to the shaft tube connecting positioning plate (12).

5. A wind turbine yaw unloader according to claim 3, characterized in that, The connecting finger (1) is configured as a ring-shaped watch strap finger, with a ring of through grooves distributed on the connecting finger (1), and the middle part of the connecting finger (1) protrudes inward.

6. A wind turbine yaw unloader according to claim 5, characterized in that, The stator slide (4) has several protrusions (13) on the side that contacts the connecting finger (1) for positioning the connecting finger (1).

7. A wind turbine yaw unloader according to claim 3, characterized in that, The connecting finger (1) is configured as a circular spring finger.

8. A wind turbine yaw unloader according to claim 7, characterized in that, The stator slide (4) or rotor slip ring (10) has a groove (14) on the side that contacts the connecting finger (1) for positioning the connecting finger (1).

9. A wind turbine yaw unloader according to claim 3, characterized in that, The rotor section also includes an upper bearing disc (15) and a lower bearing disc (16) connected to the shaft tube (7), and a number of rotor support columns (17) are connected between the upper bearing disc (15) and the lower bearing disc (16).

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