Wind turbine generator bearing shaft current damage experimental device that can simulate hot and humid environment

Abstract

The present invention discloses a wind turbine generator bearing shaft current damage experimental device capable of simulating a hot and humid environment, characterized in that it comprises a driving device, a transmission device, a sealing device, a refrigerator, a heater, a measurement and control device, a humidifying device, a current loading device and a base, wherein the sealing device is installed on the base, the driving device is connected to the experimental bearing arranged in the sealing device after passing through the transmission device, the sealing device is provided with a refrigerator, a heater and a humidifying device, the refrigerator and the heater are connected to the measurement and control device, and the current loading device is connected to the experimental bearing. The present invention can simulate the different degrees of damage to the bearing of the wind turbine generator under high temperature, low temperature and hot and humid working conditions through the mutual cooperation of the refrigerator, the heater, the measurement and control device, the humidifying device and the current loading device, and provide an example for checking the cause of the generator failure.

Description

Technical Field

[0001] The invention relates to the field of motors, and in particular to a wind turbine generator bearing shaft current damage experimental device capable of simulating a hot and humid environment. Background Art

[0002] Wind energy is a sustainable clean energy source and has become a priority development direction in my country's energy structure optimization and green development transformation. my country's wind energy resources are mainly distributed in the southeast coast and nearby islands, eastern Heilongjiang and Jilin, Liaodong, Shandong Peninsula coast, Inner Mongolia, Gansu, Xinjiang and the Qinghai-Tibet Plateau. Although these places are rich in wind resources, the environment and climate are also very harsh. Wind turbines often operate in high and low temperature extreme temperature difference environments of high mountains and plateaus, near seas, islands and other hot and cold environments. Wind turbines in plateaus and mountainous areas are mainly affected by the large temperature difference between day and night and the high wind speed. The highest operating temperature of the bearing can reach about 100 degrees and the lowest is about minus 40 degrees. The humidity of the internal environment of offshore wind turbines is between 40% rh and 80% rh when they are working.

[0003] As the power of wind turbine generators continues to increase and frequency conversion technology is used more frequently, motor bearing shaft current damage occurs from time to time, especially in extreme temperature changes and hot and humid marine environments, where shaft current damage is more serious. Studying the mechanism of wind turbine motor bearing current damage in hot and humid environments has become a key factor in preventing and controlling shaft current damage. This type of experiment is a damage experiment and cannot be performed on wind farm motors. Developing a bearing current damage simulation experiment device in hot and humid environments has become the most necessary and feasible solution. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a wind turbine generator bearing shaft current damage experimental device which has a simple structure, is safe and reliable and can simulate a hot and humid environment.

[0005] The technical solution of the present invention for solving the above technical problems is: a wind turbine generator bearing shaft current damage experimental device that can simulate a humid and hot environment, including a driving device, a transmission device, a sealing device, a refrigerator, a heater, a measurement and control device, a humidifying device, a current loading device and a base, wherein the sealing device is installed on the base, the driving device is connected to the experimental bearing arranged in the sealing device after passing through the transmission device, the sealing device is provided with a refrigerator, a heater and a humidifying device, the refrigerator and the heater are connected to the measurement and control device, and the current loading device is connected to the experimental bearing.

[0006] The above-mentioned wind turbine generator bearing shaft current damage experimental device that can simulate a hot and humid environment, the driving device adopts a variable frequency motor, the variable frequency motor is fixedly installed on the base through a first support seat, and the damage degree of the bearing caused by the shaft current generated at different speeds is simulated by controlling the speed of the variable frequency motor.

[0007] The above-mentioned wind turbine generator bearing shaft current damage experimental device that can simulate a hot and humid environment, the transmission device includes a rotating main shaft and a coupling, the output shaft of the variable frequency motor is connected to one end of the rotating main shaft through the coupling, the contact part of the rotating main shaft and the coupling is provided with an insulating coating, and the other end of the rotating main shaft extends into the closed device and is fixedly connected to the inner ring of the experimental bearing.

[0008] The above-mentioned wind turbine generator bearing shaft current damage experimental device that can simulate a hot and humid environment, the closed device includes a metal cavity, a first insulating bearing, a second insulating bearing, and aerogel insulation cotton. The first insulating bearing and the second insulating bearing are respectively arranged at both ends of the metal cavity, and the first insulating bearing and the second insulating bearing are passed through the other end of the rotating main shaft. The two sides of the bottom of the metal cavity are respectively fixed to the base through the second support seat and the third support seat, and the aerogel insulation cotton covers the inner surface of the metal cavity.

[0009] The above-mentioned wind turbine generator bearing shaft current damage experimental device that can simulate a hot and humid environment, the test bearing is fixed on a convex plate in a metal cavity, the convex plate is welded to the metal cavity, the convex plate has a flat surface on the top and an arc convex surface on the bottom, the convex surface fits tightly with the lower surface of the metal cavity, a bearing seat is fixed on the plane, the bearing seat and the convex plate are electrically isolated by an insulating gasket, and the bolt hole of the bearing seat and the bolt are electrically isolated by insulating rubber.

[0010] The above-mentioned wind turbine generator bearing shaft current damage experimental device that can simulate a hot and humid environment, the current loading device includes a DC power supply, one end of the DC power supply is connected to a brush fixed on the rotating main shaft through a wire, and the other end is connected to the bearing seat through an empty conduit to form a current loading circuit.

[0011] The above-mentioned wind turbine generator bearing shaft current damage experimental device that can simulate a humid and hot environment, the refrigerator includes a first semiconductor refrigeration plate, a first cooling fan, and a first heat sink. The hot end of the first semiconductor refrigeration plate is mechanically connected to the first cooling fan, and the cold end of the first semiconductor refrigeration plate is mechanically connected to the first heat sink.

[0012] The above-mentioned wind turbine generator bearing shaft current damage experimental device that can simulate a humid and hot environment, the heater includes a second semiconductor refrigeration plate, a second cooling fan, and a second heat sink, the cold end of the second semiconductor refrigeration plate is mechanically connected to the second cooling fan, and the hot end of the second semiconductor refrigeration plate is mechanically connected to the second heat sink.

[0013] The above-mentioned wind turbine generator bearing shaft current damage experimental device that can simulate a hot and humid environment, the measurement and control device includes a refrigeration plate driver, the refrigeration plate driver is electrically connected to the refrigerator and the heater, and adjusts the temperature inside the metal cavity when the refrigerator and the heater are running.

[0014] The above-mentioned wind turbine generator bearing shaft current damage experimental device that can simulate a hot and humid environment, the humidifying device is a humidity generator, the humidity generator is connected to the metal cavity through an air duct, and provides hot and humid gas with different relative humidity to the inside of the metal cavity.

[0015] The beneficial effects of the present invention are as follows: the present invention is provided with a driving device, a transmission device, a sealing device, a refrigerator, a heater, a measurement and control device, a humidifying device, a current loading device and a base, the sealing device is installed on the base, the driving device is connected to the experimental bearing arranged in the sealing device after passing through the transmission device, the sealing device is provided with a refrigerator, a heater, and a humidifying device, the refrigerator and the heater are connected to the measurement and control device, and the current loading device is connected to the experimental bearing, and the mutual cooperation of the refrigerator, the heater, the measurement and control device, the humidifying device and the current loading device can simulate the different degrees of damage to the bearing of the wind turbine generator under high temperature, low temperature and hot and humid working conditions, thereby providing an example for inspecting the cause of the generator failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a stereogram of the present invention.

[0017] Figure 2 It is the front view of the present invention.

[0018] Figure 3 It is a side structural diagram of the present invention.

[0019] Figure 4 Schematic diagram of the installation position of the brush.

[0020] Figure 5 Schematic diagram of the location of the insulating coating. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1-Figure 5 As shown, a wind turbine generator bearing shaft current damage experimental device that can simulate a hot and humid environment includes a driving device, a transmission device, a sealing device, a refrigerator 5, a heater 7, a measurement and control device, a humidifying device, a current loading device and a base 9. The sealing device is installed on the base 9, and the driving device is connected to the experimental bearing 16 arranged in the sealing device after passing through the transmission device. The sealing device is provided with a refrigerator 5, a heater 7, and a humidifying device. The refrigerator 5 and the heater 7 are connected to the measurement and control device, and the current loading device is connected to the experimental bearing 16.

[0023] The driving device adopts a variable frequency motor 1, which is fixedly mounted on the base 9 via a first support seat 13. By controlling the rotation speed of the variable frequency motor 1, the damage degree of the bearing caused by the shaft current generated at different rotation speeds is simulated.

[0024] The transmission device includes a rotating main shaft 2 and a coupling 3. The output shaft of the variable frequency motor 1 is connected to one end of the rotating main shaft 2 via the coupling 3. The contact portion between the rotating main shaft 2 and the coupling 3 is provided with an insulating coating 22. The other end of the rotating main shaft 2 extends into the sealed device and is fixedly connected to the inner ring of the experimental bearing 16.

[0025] The sealed device includes a metal cavity 6, a first insulating bearing 4, a second insulating bearing 8, and aerogel insulation cotton 18. The first insulating bearing 4 and the second insulating bearing 8 are respectively arranged at both ends of the metal cavity 6, and the first insulating bearing 4 and the second insulating bearing 8 are passed through the other end of the rotating main shaft 2. The two sides of the bottom of the metal cavity 6 are respectively fixed to the base 9 through the second support seat 11 and the third support seat 20, and the aerogel insulation cotton 18 covers the inner surface of the metal cavity 6.

[0026] The test bearing is fixed on a convex plate 19 in the metal cavity 6. The convex plate 19 is welded to the metal cavity 6. The convex plate 19 has a flat surface on the top and an arc convex surface on the bottom. The convex surface fits tightly with the lower surface of the metal cavity 6. A bearing seat 14 is fixed on the plane. The bearing seat 14 and the convex plate 19 are electrically isolated by an insulating gasket 17. The bolt holes of the bearing seat 14 and the bolts are electrically isolated by insulating rubber 21.

[0027] The current loading device includes a DC power supply, one end of which is connected to a brush 23 fixed on the rotating main shaft 2 through a wire, and the other end is connected to the bearing seat 14 through an empty conduit 15 to form a current loading loop.

[0028] The refrigerator 5 includes a first semiconductor refrigeration sheet, a first heat dissipation fan, and a first heat sink. The hot end of the first semiconductor refrigeration sheet is mechanically connected to the first heat dissipation fan, and the cold end of the first semiconductor refrigeration sheet is mechanically connected to the first heat sink.

[0029] The heater 7 comprises a second semiconductor refrigeration sheet, a second cooling fan, and a second cooling fin. The cold end of the second semiconductor refrigeration sheet is mechanically connected to the second cooling fan, and the hot end of the second semiconductor refrigeration sheet is mechanically connected to the second cooling fin.

[0030] The measuring and controlling device comprises a cooling plate driver 12, which is electrically connected to the refrigerator 5 and the heater 7, and adjusts the temperature inside the metal cavity 6 when the refrigerator 5 and the heater 7 are in operation.

[0031] The humidifying device is a humidity generator 10 , which is connected to the metal cavity 6 through an air duct to provide hot and humid gas with different relative humidity to the inside of the metal cavity 6 .

[0032] The working principle of the present invention is:

[0033] The current loading device provides current to the experimental device, and the current passes through the outer ring, ball, inner ring, rotating main shaft 2, and brush of the experimental bearing 16 and then is connected back to the power supply; the size of the loaded current can be controlled, and different temperatures and humidities are provided to the operating experimental bearing 16 by adjusting the heater 7, refrigerator 5, and humidifying device, thereby effectively simulating the different degrees of damage to the bearing caused by the shaft current under high temperature, low temperature, and hot and humid conditions, providing an example for examining the cause of the generator failure.

[0034] When operating in a high temperature environment, the heater 7 is started, and the heating temperature can be adjusted by the refrigeration chip driver 12. When operating in an extremely cold environment, the refrigerator 5 is started, and the refrigeration temperature can be adjusted by the refrigeration chip driver 12.

[0035] When working in a hot and humid environment, the heater 7 and the humidifier are started to provide an environment with different humidity and temperature. The external environment can be simulated by cooling or heating to more than 40 degrees Celsius, and the internal environment of the bearing can be simulated by heating above normal temperature.

Claims

1. A wind turbine generator bearing shaft current damage test device that can simulate a hot and humid environment, characterized in that: It includes a driving device, a transmission device, a sealing device, a refrigerator, a heater, a measurement and control device, a humidifying device, a current loading device and a base. The sealing device is installed on the base. The driving device is connected to the experimental bearing arranged in the sealing device after passing through the transmission device. The sealing device is provided with a refrigerator, a heater and a humidifying device. The refrigerator and the heater are connected to the measurement and control device, and the current loading device is connected to the experimental bearing. The driving device adopts a variable frequency motor, which is fixedly mounted on the base through a first support seat. By controlling the speed of the variable frequency motor, the damage degree of the shaft current generated at different speeds to the bearing is simulated; The transmission device includes a rotating main shaft and a coupling. The output shaft of the variable frequency motor is connected to one end of the rotating main shaft through the coupling. The contact portion between the rotating main shaft and the coupling is provided with an insulating coating. The other end of the rotating main shaft extends into the sealed device and is fixedly connected to the inner ring of the experimental bearing. The sealing device comprises a metal cavity, a first insulating bearing, a second insulating bearing, and aerogel insulation cotton. The first insulating bearing and the second insulating bearing are respectively arranged at both ends of the metal cavity, and the first insulating bearing and the second insulating bearing are passed through the other end of the rotating main shaft. The two sides of the bottom of the metal cavity are respectively fixed to the base through the second support seat and the third support seat, and the aerogel insulation cotton covers the inner surface of the metal cavity; The experimental bearing is fixed on a convex plate in a metal cavity, the convex plate is welded on the metal cavity, the convex plate has a flat surface on the top and a circular arc convex surface on the bottom, the convex surface is tightly fitted with the lower surface of the metal cavity, a bearing seat is fixed on the plane, the bearing seat and the convex plate are electrically isolated by an insulating gasket, and the bolt hole of the bearing seat and the bolt are electrically isolated by insulating rubber; The current loading device comprises a DC power supply, one end of which is connected to a brush fixed on the rotating main shaft through a wire, and the other end is connected to the bearing seat through an empty conduit to form a current loading loop.

2. The wind turbine generator bearing shaft current damage experimental device capable of simulating a hot and humid environment according to claim 1 is characterized in that: The refrigerator comprises a first semiconductor refrigeration plate, a first heat dissipation fan, and a first heat dissipation plate. The hot end of the first semiconductor refrigeration plate is mechanically connected to the first heat dissipation fan, and the cold end of the first semiconductor refrigeration plate is mechanically connected to the first heat dissipation plate.

3. The wind turbine generator bearing shaft current damage experimental device capable of simulating a hot and humid environment according to claim 1 is characterized in that: The heater comprises a second semiconductor refrigeration sheet, a second heat dissipation fan and a second heat dissipation sheet. The cold end of the second semiconductor refrigeration sheet is mechanically connected to the second heat dissipation fan, and the hot end of the second semiconductor refrigeration sheet is mechanically connected to the second heat dissipation sheet.

4. The wind turbine generator bearing shaft current damage experimental device capable of simulating a hot and humid environment according to claim 1 is characterized in that: The measuring and controlling device comprises a cooling plate driver, which is electrically connected to the refrigerator and the heater and adjusts the temperature inside the metal cavity when the refrigerator and the heater are in operation.

5. The wind turbine generator bearing shaft current damage experimental device capable of simulating a hot and humid environment according to claim 1 is characterized in that: The humidifying device is a humidity generator, which is connected to the metal cavity through an air duct and provides hot and humid gas with different relative humidity to the inside of the metal cavity.

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