Shaft current damage simulation device for insulated bearing of wind driven generator

Abstract

The utility model discloses a wind driven generator insulation bearing shaft current damage simulation device, which comprises a workbench, the upper end of the workbench is fixedly connected with a power distribution cabinet, a driving motor, a data acquisition unit, a DC power supply and two hydraulic push rods, the output end of the driving motor is fixedly connected with a coupling, the coupling is connected with a main shaft, and the main shaft is connected with a motor. The upper ends of the output ends of the two hydraulic push rods are fixedly connected with a bearing seat, an insulating bearing body is arranged in the bearing seat, the direct-current power source is connected with two wires, the two wires are connected with an electric brush and an iron sheet respectively, the iron sheet is installed at the bottom of the bearing seat, one end of the iron sheet makes contact with the outer ring of the insulating bearing body, and the other end of the iron sheet makes contact with the outer ring of the insulating bearing body. The driving motor is matched with the main shaft to drive the bearing to work, the working process of the wind driven generator is simulated, damage of impurities in the bearing seat to an insulating coating on the outer surface of the insulating bearing is simulated, and experimental data when the bearing is corroded by current after the insulating coating is damaged are collected.

Description

Technical Field

[0001] This utility model relates to the field of simulation devices, specifically a simulation device for shaft current damage of insulated bearings of wind turbine generators. Background Technology

[0002] Shaft current is mainly caused by the imbalance of magnetic flux inside the motor. The unbalanced leakage flux is mainly caused by the design tolerances of the product's mechanical parts and the assembly process, which will induce voltage and current in the circuit of the stator housing, drive-end bearing, shaft, and non-drive-end bearing. In the existing technology, plasma spraying technology is usually used to spray a uniform ceramic (alumina) coating on the inner or outer ring of ordinary bearings, thereby integrating insulation properties into the bearing and giving it insulation properties.

[0003] When a bearing is driven to rotate by a connected shaft, it generates a huge starting torque, which is transmitted to the bearing. If the bearing housing in the wind turbine is not properly fitted to the bearing or if there are impurities in the bearing housing that have not been cleaned, the gap between the bearing and the inner wall of the bearing housing will increase. This will cause the bearing to rotate slightly in the bearing housing, resulting in friction between the outer ring of the bearing and the inner wall of the bearing housing. This will damage the insulating coating of the outer ring of the bearing and reduce the insulation performance of the insulated bearing.

[0004] Currently, there are few simulation test benches for shaft current corrosion in actual wind turbine operation, making it difficult to collect information data on shaft current corrosion in wind turbines and analyze the degradation law of bearings. Utility Model Content

[0005] The purpose of this invention is to provide a simulation device for shaft current damage of wind turbine insulated bearings. This device is simple in structure and easy to operate, and can collect data on the shaft current damage of wind turbine insulated bearings when the bearings are subjected to shaft current corrosion.

[0006] To achieve the above objectives, a device for simulating shaft current damage of insulated bearings in wind turbine generators is provided. The device includes a workbench, a power distribution cabinet, a drive motor, a data acquisition unit, a DC power supply, and two hydraulic push rods fixedly connected to the upper end of the workbench. The output end of the drive motor faces the hydraulic push rods, and the two hydraulic push rods are symmetrical about the output end of the drive motor. A coupling is fixedly connected to the output end of the drive motor, and the coupling is connected to a main shaft at one end of the main shaft. Bearing seats are fixedly connected to the upper ends of the output ends of the two hydraulic push rods, and the two hydraulic push rods are located at opposite ends of the bearing seats. An insulated bearing body is housed within the bearing seat, and the main shaft penetrates the middle of the insulated bearing body and is fixedly connected to the inner ring of the insulated bearing body. The DC power supply is connected to two wires, each connected to a brush and an iron plate, respectively. The brush is installed on the inner ring of the insulated bearing body, and the iron plate is installed at the bottom of the bearing seat, with one end of the iron plate contacting the outer ring of the insulated bearing body. This invention provides a simple and easy-to-operate simulation device for shaft current damage in wind turbine insulated bearings, which collects data on bearings subjected to shaft current corrosion.

[0007] According to the wind turbine generator insulated bearing shaft current damage simulation device, the data acquisition unit consists of a current sensor, a temperature sensor, a voltage sensor, and a processing mechanism. The current sensor, temperature sensor, and voltage sensor are respectively mounted on the bearing housing. The processing mechanism is fixedly connected to the upper end of the workbench, and the signal output terminals of the current sensor, temperature sensor, and voltage sensor are connected to the processing mechanism. The current sensor and voltage sensor detect changes in current and voltage during the simulation process, the temperature sensor detects temperature changes when the bearing is subjected to shaft current corrosion, and the processing mechanism collects and processes the detection data from the current sensor, temperature sensor, and voltage sensor.

[0008] According to the wind turbine insulated bearing shaft current damage simulation device, the data acquisition unit is connected to a computer via a data cable. The computer is used to display the data collected by the data acquisition unit.

[0009] According to the wind turbine insulated bearing shaft current damage simulation device, a lifting device is fixedly connected to the upper end of the workbench. The lifting device is used to move the wind turbine bearing, thereby improving work efficiency.

[0010] According to the wind turbine insulated bearing shaft current damage simulation device, the bearing housing consists of an upper bearing sleeve, a bearing wear simulation mechanism, and a lower bearing sleeve. Two hydraulic push rods are located at the two ends of the lower bearing sleeve, and the upper ends of the hydraulic push rods are fixedly connected to the lower end of the lower bearing sleeve. The upper bearing sleeve is located at the upper end of the lower bearing sleeve. A circular channel is formed at the middle of the opposite ends of the lower bearing sleeve and the upper bearing sleeve. The insulated bearing body is located in the channel formed by the lower bearing sleeve and the upper bearing sleeve. Screws are fixedly connected to both sides of the upper end of the lower bearing sleeve, and the upper ends of the screws penetrate the upper bearing sleeve and are slidably connected to the upper bearing sleeve. Nuts are threaded to the outer ends of the screws, and the nuts cooperate with the screws to fix the upper bearing sleeve. An installation port is opened at the bottom of the lower bearing sleeve, and an iron plate passes through the installation port and is fixedly connected to the side wall of the installation port. The bearing wear simulation mechanism is installed at the lower end of the lower bearing sleeve, and the middle part of the bearing wear simulation mechanism passes through the installation port. The upper end of the middle part of the bearing wear simulation mechanism contacts the outer ring of the insulated bearing body. The upper and lower bearing sleeves facilitate the placement of the wind turbine bearings into the device for simulation testing.

[0011] According to the wind turbine insulated bearing shaft current damage simulation device, the bearing wear simulation mechanism consists of a U-shaped mounting bracket and a friction block. The U-shaped mounting bracket is located at the bottom of the lower bearing sleeve, and the lower end of the lower bearing sleeve extends into the U-shaped mounting bracket. The friction block is fixedly connected to the middle of the U-shaped mounting bracket, and the upper end of the friction block passes through the mounting opening. The upper end of the friction block contacts the outer ring of the insulated bearing body, and the upper surface of the friction block is provided with fine wear-resistant particles. Bolts are installed on both sides of the U-shaped mounting bracket, and the bolts penetrate the U-shaped mounting bracket, extending into the lower bearing sleeve and threadedly connected to the lower bearing sleeve. The friction block simulates the wear of the insulating coating of the bearing outer sleeve by impurities in the bearing sleeve through the wear-resistant particles on its surface.

[0012] According to the wind turbine generator insulated bearing shaft current damage simulation device, a lifting ring is fixedly connected to the upper middle part of the upper bearing sleeve. The lifting ring allows the upper bearing sleeve to be lifted by lifting equipment, facilitating the disassembly and assembly of the upper bearing sleeve and reducing the workload.

[0013] Compared with the prior art, the beneficial effects of this utility model are: by driving the main shaft to drive the insulating bearing body to work, the working process of the wind turbine is simulated, and the damage caused by impurities in the bearing housing to the insulating coating on the outer surface of the insulating bearing body is simulated, and experimental data on the shaft current corrosion of the bearing after the insulating coating is damaged are collected.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is a perspective view of the wind turbine generator insulated bearing shaft current damage simulation device of this utility model;

[0017] Figure 2 This is a perspective view of the bearing housing of the wind turbine generator insulated bearing shaft current damage simulation device of this utility model;

[0018] Figure 3 This is a three-dimensional view of the bearing wear simulation mechanism of the wind turbine generator insulating bearing shaft current damage simulation device of this utility model.

[0019] In the diagram: 1. Distribution cabinet; 2. Drive motor; 3. Workbench; 4. Data acquisition unit; 5. DC power supply; 6. Hydraulic push rod; 7. Wire; 8. Brush; 9. Insulated bearing body; 10. Bearing seat; 11. Spindle; 12. Coupling; 13. Lifting equipment; 14. Iron sheet; 15. Lifting ring; 16. Upper bearing sleeve; 17. Screw; 18. Bearing wear simulation mechanism; 19. Mounting port; 20. Lower bearing sleeve; 21. Nut; 22. U-shaped mounting bracket; 23. Friction block; 24. Bolt. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1 - Figure 3This utility model provides a technical solution: a wind turbine generator insulating bearing shaft current damage simulation device, including a workbench 3. A power distribution cabinet 1, a drive motor 2, a data acquisition unit 4, a DC power supply 5, and two hydraulic push rods 6 are fixedly connected to the upper end of the workbench 3. The power distribution cabinet 1 is connected to an external power source, and the DC power supply 5 is connected to an external power source through the power distribution cabinet 1. The output end of the drive motor 2 faces the hydraulic push rods 6, and the two hydraulic push rods 6 are symmetrical about the output end of the drive motor 2. A coupling 12 is fixedly connected to the output end of the drive motor 2, and the coupling 12 is connected to a main shaft 11, with the coupling 12 located at one end of the main shaft 11. The upper ends of the output ends of the two hydraulic push rods 6 are fixedly connected to the bearing housings 10, and the two hydraulic push rods 6 are located at both ends of the bearing housings 10. The bearing housings 10 consist of an upper bearing sleeve 16, a bearing wear simulation mechanism 18, and a lower bearing sleeve 20. The two hydraulic push rods 6 are located at both ends of the lower bearing sleeve 20, and the upper ends of the hydraulic push rods 6 are fixedly connected to the lower ends of the lower bearing sleeve 20. The upper bearing sleeve 16 is located at the upper end of the lower bearing sleeve 20. A lifting ring 15 is fixedly connected to the middle of the upper end of the upper bearing sleeve 16. The lifting ring 15 enables the upper bearing sleeve 16 to be lifted by the lifting equipment 13, which facilitates the disassembly and assembly of the upper bearing sleeve 16 and reduces the workload. A circular channel is formed at the middle of the opposite ends of the lower bearing sleeve 20 and the upper bearing sleeve 16. The insulating bearing body 9 is located in the channel formed by the lower bearing sleeve 20 and the upper bearing sleeve 16. Screws 17 are fixedly connected to both sides of the upper end of the lower bearing sleeve 20, and the upper end of the screws 17 passes through the upper bearing sleeve 16 and is slidably connected to the upper bearing sleeve 16. Nuts 21 are threadedly connected to the outer end of the screws 17, and the nuts 21 cooperate with the screws 17 to fix the upper bearing sleeve 16. An installation port 19 is opened at the bottom of the lower bearing sleeve 20, and the iron plate 14 passes through the installation port 19 and is fixedly connected to the side wall of the installation port 19. The bearing wear simulation mechanism 18 is installed at the lower end of the lower bearing sleeve 20, and the middle part of the bearing wear simulation mechanism 18 passes through the installation port 19. The upper end of the middle part of the bearing wear simulation mechanism 18 contacts the outer ring of the insulating bearing body 9. The arrangement of the upper bearing sleeve 16 and the lower bearing sleeve 20 facilitates the placement of the wind turbine bearing into the device for simulation testing. An insulated bearing body 9 is provided in the bearing housing 10, and the main shaft 11 passes through the middle of the insulated bearing body 9 and is fixedly connected to the inner ring of the insulated bearing body 9. There is a gap between the insulated bearing body 9 and the inner wall of the bearing sleeve. The DC power supply 5 is connected to two wires 7, and the two wires 7 are respectively connected to a brush 8 and an iron plate 14. The brush 8 is installed on the inner ring of the insulated bearing body 9, and the iron plate 14 is installed on the bottom of the bearing housing 10, with one end of the iron plate 14 in contact with the outer ring of the insulated bearing body 9.The bearing wear simulation mechanism 18 consists of a U-shaped mounting bracket 22 and a friction block 23. The U-shaped mounting bracket 22 is located at the bottom of the lower bearing sleeve 20, and the lower end of the lower bearing sleeve 20 extends into the U-shaped mounting bracket 22. The friction block 23 is fixedly connected to the middle of the U-shaped mounting bracket 22, and the upper end of the friction block 23 passes through the mounting port 19. The upper end of the friction block 23 contacts the outer ring of the insulating bearing body 9, and the upper surface of the friction block 23 is provided with fine wear-resistant particles. Bolts 24 are installed on both sides of the U-shaped mounting bracket 22, and the bolts 24 penetrate the U-shaped mounting bracket 22 and extend into the lower bearing sleeve 20 and are threadedly connected to the lower bearing sleeve 20. The friction block 23 simulates the wear of impurities in the bearing sleeve on the insulating coating of the bearing outer sleeve through the wear-resistant particles on its surface. The data acquisition unit 4 consists of a current sensor, a temperature sensor, a voltage sensor, and a processing mechanism. The current sensor, temperature sensor, and voltage sensor are respectively mounted on the bearing housing 10. The processing mechanism is fixedly connected to the upper end of the workbench 3, and the signal output terminals of the current sensor, temperature sensor, and voltage sensor are connected to the processing mechanism. The current sensor and voltage sensor detect changes in current and voltage during the simulation process, while the temperature sensor detects temperature changes when the bearing is subjected to shaft current corrosion. The processing mechanism collects and processes the detection data from the current sensor, temperature sensor, and voltage sensor. The data acquisition unit 4 is connected to a computer via a data cable. The computer is used to display the data collected by the data acquisition unit 4. A lifting device 13 is fixedly connected to the upper end of the workbench 3. The lifting device 13 is used to move the wind turbine bearing, improving work efficiency.

[0022] Working principle: In use, first unscrew the nut 21 from the screw 17, and with the help of the lifting equipment 13, use the lifting ring 15 to lift the upper bearing sleeve 16 and move it aside. Then, use the lifting equipment 13 to lift the insulated bearing to be tested and place it on the lower bearing sleeve 20. Then, use the starting equipment to reset the upper bearing sleeve 16. After the upper bearing sleeve 16 is reset, use the nut 21 and the screw 17 to fix the upper bearing sleeve 16. Then, insert the main shaft 11 into the bearing to be tested. The main shaft 11 is connected to the output of the drive motor 2 through the coupling 12. The drive motor 2 drives the main shaft 11 to rotate through the coupling 12, causing the inner ring of the insulating bearing body 9 in the bearing housing 10 to rotate relative to the outer ring, while simultaneously causing the insulating bearing body 9 to rotate. This causes the friction block 23 in the bearing wear simulation mechanism 18 to wear the insulating coating on the surface of the insulating bearing body 9. The DC power supply 5 connects the brush 8 and the iron plate 14 through the wire 7, introducing current from the damaged part of the insulating coating, breaking down the oil film and forming a circuit with the brush 8. Through the DC power supply 5, the magnitude of the bearing shaft current of the wind turbine is simulated.

[0023] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A device for simulating shaft current damage in insulating bearings of wind turbine generators, comprising a workbench (3), characterized in that, The upper end of the workbench (3) is fixedly connected to a power distribution cabinet (1), a drive motor (2), a data acquisition unit (4), a DC power supply (5), and two hydraulic push rods (6). The output end of the drive motor (2) faces the hydraulic push rods (6), and the two hydraulic push rods (6) are symmetrical about the output end of the drive motor (2). The output end of the drive motor (2) is fixedly connected to a coupling (12), which is connected to a main shaft (11). The coupling (12) is located at one end of the main shaft (11). The upper end of the output ends of the two hydraulic push rods (6) is fixedly connected to a bearing seat (1). 0), and two hydraulic push rods (6) are located at both ends of the bearing housing (10). The bearing housing (10) is provided with an insulating bearing body (9), and the main shaft (11) passes through the middle of the insulating bearing body (9) and is fixedly connected to the inner ring of the insulating bearing body (9). The DC power supply (5) is connected to two wires (7). The two wires (7) are respectively connected to a brush (8) and an iron plate (14). The brush (8) is installed on the inner ring of the insulating bearing body (9), and the iron plate (14) is installed at the bottom of the bearing housing (10). One end of the iron plate (14) is in contact with the outer ring of the insulating bearing body (9).

2. The wind turbine generator insulated bearing shaft current damage simulation device as described in claim 1, characterized in that: The data acquisition unit (4) consists of a current sensor, a temperature sensor, a voltage sensor and a processing mechanism. The current sensor, temperature sensor and voltage sensor are respectively installed on the bearing seat (10). The processing mechanism is fixedly connected to the upper end of the workbench (3), and the signal output terminals of the current sensor, temperature sensor and voltage sensor are connected to the processing mechanism.

3. The wind turbine generator insulated bearing shaft current damage simulation device as described in claim 1, characterized in that: The data acquisition unit (4) is connected to a computer via a data cable.

4. The wind turbine generator insulated bearing shaft current damage simulation device as described in claim 1, characterized in that: The upper end of the workbench (3) is fixedly connected to a lifting device (13).

5. The wind turbine generator insulated bearing shaft current damage simulation device as described in claim 1, characterized in that: The bearing housing (10) consists of an upper bearing sleeve (16), a bearing wear simulation mechanism (18), and a lower bearing sleeve (20). Two hydraulic push rods (6) are located at the two ends of the lower bearing sleeve (20), and the upper end of the hydraulic push rod (6) is fixedly connected to the lower end of the lower bearing sleeve (20). The upper bearing sleeve (16) is located at the upper end of the lower bearing sleeve (20). A circular channel is formed at the middle of the opposite ends of the lower bearing sleeve (20) and the upper bearing sleeve (16). The insulating bearing body (9) is located in the channel formed by the lower bearing sleeve (20) and the upper bearing sleeve (16). Screws (17) are fixedly connected to both sides of the upper end of the lower bearing sleeve (20), and the screws... (17) The upper end passes through the upper bearing sleeve (16) and is slidably connected to the upper bearing sleeve (16). The outer end of the screw (17) is threaded with a nut (21), and the nut (21) cooperates with the screw (17) to fix the upper bearing sleeve (16). The bottom of the lower bearing sleeve (20) is provided with an installation port (19), and the iron plate (14) passes through the installation port (19) and is fixedly connected to the side wall of the installation port (19). The bearing wear simulation mechanism (18) is installed at the lower end of the lower bearing sleeve (20), and the middle part of the bearing wear simulation mechanism (18) passes through the installation port (19). The upper end of the middle part of the bearing wear simulation mechanism (18) contacts the outer ring of the insulating bearing body (9).

6. The wind turbine generator insulated bearing shaft current damage simulation device as described in claim 5, characterized in that: The bearing wear simulation mechanism (18) consists of a U-shaped mounting bracket (22) and a friction block (23). The U-shaped mounting bracket (22) is located at the bottom of the lower bearing sleeve (20), and the lower end of the lower bearing sleeve (20) extends into the U-shaped mounting bracket (22). The friction block (23) is fixedly connected to the middle of the U-shaped mounting bracket (22), and the upper end of the friction block (23) passes through the mounting port (19). The upper end of the friction block (23) contacts the outer ring of the insulating bearing body (9), and the upper surface of the friction block (23) is provided with fine wear-resistant particles. Bolts (24) are installed on both sides of the U-shaped mounting bracket (22), and the bolts (24) penetrate the U-shaped mounting bracket (22). The bolts (24) extend into the lower bearing sleeve (20) and are threadedly connected to the lower bearing sleeve (20).

7. The wind turbine generator insulated bearing shaft current damage simulation device as described in claim 5, characterized in that: A lifting ring (15) is fixedly connected to the middle of the upper end of the upper bearing sleeve (16).

Images