A wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder.

Abstract

This invention provides a wind turbine pitch slip ring with a built-in slotted photoelectric switch and encoder disk. It includes a fixed housing, inside which a pitch slip ring is rotatably connected. One end of the pitch slip ring is fixedly connected to an inner ring of a bearing. A bearing plate is installed inside the top of the fixed housing, and multiple spherical rotors are rolled between the bearing plate and the inner ring of the bearing. A slotted photoelectric switch is installed on the surface of the bearing plate, and an encoder disk is installed on the surface of the bearing plate. The encoder disk has multiple gratings on its surface, and the encoder disk and the gratings are rotatably connected to the slotted photoelectric switch. The wind turbine pitch slip ring with a built-in slotted photoelectric switch and encoder disk provided by this invention has the advantages of low cost and ease of measuring wind turbine hub speed.

Description

Technical Field

[0001] This utility model relates to the field of pitch slip ring technology, and in particular to a wind power pitch slip ring with a built-in slotted photoelectric switch and code disk. Background Technology

[0002] Pitch slip rings are key electrical components in wind turbine generators used to transmit blade power and control signals. Their core function is to ensure the efficient and stable operation of wind turbine generators.

[0003] Since the pitch slip ring is mounted on the main shaft of the gearbox, an encoder can be integrated on the pitch slip ring to measure the rotational speed of the wind turbine hub. However, the encoder is expensive and accounts for a large proportion of the slip ring's material cost. Moreover, the encoder has a high failure rate in actual use, which brings high maintenance costs to wind farm operation and maintenance and slip ring manufacturers.

[0004] Therefore, it is necessary to provide a new wind turbine pitch slip ring with a built-in slotted photoelectric switch and encoder to solve the above problems. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a wind turbine pitch slip ring with a built-in slotted photoelectric switch and encoder that is low in cost and easy to measure the speed of the wind turbine hub.

[0006] To solve the above-mentioned technical problems, the wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder disk provided by this utility model includes: a fixed shell, in which a pitch slip ring is rotatably connected, and one end of the pitch slip ring is fixedly connected to the inner ring of a bearing; a bearing plate is installed inside the top of the fixed shell, and multiple spherical rotors are rolled between the bearing plate and the inner ring of the bearing; a slotted photoelectric switch is installed on the surface of the bearing plate, and an encoder disk is installed on the surface of the bearing plate, with multiple gratings on the surface of the encoder disk, and the encoder disk and the gratings are rotatably connected to the slotted photoelectric switch.

[0007] Preferably, a retaining ring is installed on the surface of the inner ring of the bearing, the retaining ring abuts against and presses against the code disk, and the retaining ring is fixed to the surface of the inner ring of the bearing by multiple screws.

[0008] Preferably, a cover plate is installed at one end of the fixed shell, the cover plate is fixed to the surface of the fixed shell by multiple screws, and a sealing ring is placed between the cover plate and the fixed shell.

[0009] Preferably, an electric heater is mounted on the surface of the bearing plate, and the electric heater and the slotted photoelectric switch are distributed on both sides of the bearing plate.

[0010] Preferably, a magnetic shielding pad is installed on the bottom surface of the bearing plate, a base plate is installed at one end of the inner ring of the bearing, and a plurality of extrusion rings are installed on the surface of the base plate, and the extrusion rings are rotatably connected to the surface of the magnetic shielding pad.

[0011] Preferably, the sidewall cross-section of the extrusion ring is semi-circular, and the height of the extrusion ring gradually decreases from the outside to the inside.

[0012] Compared with related technologies, the wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder provided by this utility model has the following beneficial effects:

[0013] This invention provides a wind turbine pitch slip ring with a built-in slotted photoelectric switch and a code disk. One end of the slotted photoelectric switch is equipped with a light emitter, and the other end with a light receiver. When the pitch slip ring rotates, it drives the code disk to rotate. The code disk drives the grating to rotate between the light emitter and the light receiver, causing the grating on the code disk to periodically block the light signal. Each time the grating blocks one side of the light signal, the slotted photoelectric switch outputs a pulse signal. The number of pulses is counted within a fixed time interval, denoted as t. The number of pulses within this time interval is denoted as n. The number of gratings on the code disk surface is denoted as s. The rotational speed of the pitch slip ring is denoted as v. The rotational speed of the pitch slip ring can be quickly deduced using the formula v = n / (s*t), thus reducing speed measurement costs. Attached Figure Description

[0014] Figure 1 A schematic diagram of a preferred embodiment of the wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder provided by this utility model;

[0015] Figure 2 for Figure 1 The diagram shows the internal structure of the fixed shell.

[0016] Figure 3 for Figure 2 The diagram shows an exploded view of the encoder, bearing plate, and cover plate structure.

[0017] Figure 4 for Figure 2 The diagram shows an enlarged view of the structure at point A.

[0018] The following are the labels in the diagram: 1. Fixed shell, 2. Cover plate, 3. Sealing ring, 4. Slotted photoelectric switch, 5. Code disk, 51. Grating, 6. Fixed ring, 7. Electric heater, 8. Inner ring of bearing, 81. Base plate, 9. Pitch slip ring, 10. Magnetic shielding pad, 11. Bearing plate, 12. Screw, 13. Rotor, 14. Extrusion ring. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. Please refer to... Figures 1 to 4 , Figure 1 A schematic diagram of a preferred embodiment of the wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder provided by this utility model; Figure 2 for Figure 1 The top view of the fixed adhesive structure shown; Figure 3 for Figure 1 The diagram shows the internal structure of the silicone layer. Figure 4 for Figure 3 The diagram shows an enlarged view of the structure at point A. A wind turbine pitch slip ring with a built-in slotted photoelectric switch and encoder disk includes a fixed housing 1. A pitch slip ring 9 is rotatably connected inside the fixed housing 1, and one end of the pitch slip ring 9 is fixedly connected to a bearing inner ring 8. A bearing plate 11 is installed inside the top of the fixed housing 1, and multiple spherical rotors 13 are rolled between the bearing plate 11 and the bearing inner ring 8. When the pitch slip ring 9 drives the bearing inner ring 8 to rotate, the bearing inner ring 8 drives the rotors 13 to roll inside the bearing plate 11, increasing the stability of the rotation of the bearing inner ring 8.

[0020] A slotted photoelectric switch 4 is mounted on the surface of the bearing plate 11, and a code disk 5 is mounted on the surface of the bearing plate 11. The code disk 5 has multiple gratings 51 on its surface, and the code disk 5, the gratings 51, and the slotted photoelectric switch 4 are rotatably connected. A light emitter is mounted on one end of the slotted photoelectric switch 4, and a light receiver is mounted on the other end. When the pitch slip ring 9 rotates, it drives the code disk 5 to rotate. The code disk 5 drives the gratings 51 to rotate between the light emitter and the light receiver, causing the gratings 51 on the code disk 5 to periodically block the light signal. Each time the gratings 51 block one side of the light signal, the slotted photoelectric switch 5 outputs a pulse signal. The number of pulses is counted within a fixed time interval, denoted as t. The number of pulses within this time interval is denoted as n. The number of gratings 51 on the surface of the code disk 5 is denoted as s. The rotational speed of the pitch slip ring is denoted as v. The rotational speed of the pitch slip ring can be quickly deduced using the formula v = n / (s*t), reducing the cost of speed measurement.

[0021] A fixing ring 6 is installed on the surface of the inner ring 8 of the bearing. The fixing ring 6 abuts against and presses the code disk 5. The fixing ring 6 is fixed to the surface of the inner ring 8 of the bearing by multiple screws 12. In order for the fixing ring 6 to fix the code disk 5 to one end of the inner ring 8 of the bearing, the inner ring 8 of the bearing can drive the code disk 5 to rotate.

[0022] A cover plate 2 is installed at one end of the fixed housing 1. The cover plate 2 is fixed to the surface of the fixed housing 1 by multiple screws 12. A sealing ring 3 is placed between the cover plate 2 and the fixed housing 1. The sealing ring 3 increases the sealing performance of one end of the fixed housing 1 so that the cover plate 2 can close one end of the fixed housing 1. The cover plate 2, the sealing ring 3, the fixed housing 1, and the bearing plate 11 form an independent compartment to prevent contaminants from contacting the code disk 5 and the slotted photoelectric switch 4, thus facilitating the operation of the slotted photoelectric switch 4.

[0023] An electric heater 7 is installed on the surface of the bearing plate 11, and the electric heater 7 and the slotted photoelectric switch 4 are distributed on both sides of the bearing plate 11. When the temperature at one end of the fixed shell 1 is too low and affects the operation of the slotted photoelectric switch 4, the electric heater 7 is connected to the power supply, so that the electric heater 7 heats up and increases the temperature around the slotted photoelectric switch 4, preventing the temperature inside the compartment from being too low.

[0024] A magnetic shielding pad 10 is installed on the bottom surface of the bearing plate 11, and a base plate 81 is installed at one end of the inner ring 8 of the bearing. A plurality of compression rings 14 are installed on the surface of the base plate 81, and the compression rings 14 are rotatably connected to the surface of the magnetic shielding pad 10. In order to prevent the magnetic shielding pad 10 from blocking the electromagnetic field inside the fixed shell 1 from entering the compartment and thus preventing it from affecting the operation of the slotted photoelectric switch 4.

[0025] During the rotation of the bearing inner ring 8 and the base plate 81, the compression ring 14 rotates on the bottom surface of the magnetic shielding pad 10. The side wall cross-section of the compression ring 14 is semi-circular, which reduces the resistance between the compression ring 14 and the magnetic shielding pad 10, facilitating the rotation of the compression ring 14. The height of the compression ring 14 gradually decreases from the outside to the inside, making the gap between the base plate 81 and the magnetic shielding pad 10 smaller and smaller. The compression ring 14 is in close contact with the surface of the magnetic shielding pad 10, maintaining the sealing between the two, so that the space between the bearing plate 11 and the cover plate 2 forms a sealed chamber, reducing external interference and improving the accuracy of speed measurement.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A wind turbine pitch slip ring with a built-in slotted photoelectric switch and encoder, characterized in that, include: A fixed housing (1) is rotatably connected to a pitch slip ring (9) inside the fixed housing (1), and one end of the pitch slip ring (9) is fixedly connected to a bearing inner ring (8); a bearing plate (11) is installed inside the top of the fixed housing (1), and multiple spherical rotors (13) are rolled between the bearing plate (11) and the bearing inner ring (8). A slotted photoelectric switch (4) is installed on the surface of the bearing plate (11), and a code disk (5) is installed on the surface of the bearing plate (11). The surface of the code disk (5) is provided with multiple gratings (51). The code disk (5) and the gratings (51) are rotatably connected to the slotted photoelectric switch (4).

2. The wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder disk according to claim 1, characterized in that, A fixing ring (6) is installed on the surface of the bearing inner ring (8). The fixing ring (6) abuts against and presses the code disk (5). The fixing ring (6) is fixed to the surface of the bearing inner ring (8) by multiple screws (12).

3. The wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder disk according to claim 2, characterized in that, A cover plate (2) is installed at one end of the fixed shell (1). The cover plate (2) is fixed to the surface of the fixed shell (1) by multiple screws (12), and a sealing ring (3) is placed between the cover plate (2) and the fixed shell (1).

4. The wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder disk according to claim 1, characterized in that, An electric heater (7) is mounted on the surface of the bearing plate (11), and the electric heater (7) and the slotted photoelectric switch (4) are distributed on both sides of the bearing plate (11).

5. The wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder disk according to claim 1, characterized in that, A magnetic shielding pad (10) is installed on the bottom surface of the bearing plate (11), and a base plate (81) is installed at one end of the bearing inner ring (8). A plurality of extrusion rings (14) are installed on the surface of the base plate (81), and the extrusion rings (14) are rotatably connected to the surface of the magnetic shielding pad (10).

6. The wind turbine pitch slip ring with built-in slotted photoelectric switch and encoder disk according to claim 5, characterized in that, The sidewall cross-section of the extrusion ring (14) is semi-circular, and the height of the extrusion ring (14) gradually decreases from the outside to the inside.

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