Main bearing oil lubricating device of wind generating set and control method of main bearing oil lubricating device
By designing a lubrication device with main lubrication, power failure lubrication, and oil replenishment circuits, the lubrication problem of wind turbine generator sets during long-term power outages without backup power is solved, achieving reliable lubrication of the main bearing, avoiding malfunctions, responding to sudden power outages, and meeting continuous lubrication requirements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-23
- Publication Date
- 2026-03-10
AI Technical Summary
In the case of a prolonged power outage and lack of backup power, the main bearing lubrication system of a wind turbine generator set cannot function properly, leading to an increased risk of failure.
A lubrication device was designed, comprising a main lubrication circuit, a power-off lubrication circuit, an oil replenishment circuit, and a control unit. Utilizing components such as a motor pump set, normally open and normally closed solenoid valves, and a liquid level sensor, it achieves self-supply of lubricating oil by gravity and other means in the event of a power outage, ensuring continuous lubrication of the main bearing.
In the event of a power outage and the absence of a backup power source for the wind turbine generator set, it can continuously provide reliable lubrication to the main bearing, preventing unit failures caused by lubrication interruption. Furthermore, the oil replenishment circuit ensures that the high-level oil tank is always full of oil to cope with sudden power outages.
Smart Images
Figure CN121630663A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of main bearing oil lubrication of a wind turbine generator system, and particularly to a main bearing oil lubrication device of a wind turbine generator system and a control method thereof. BACKGROUND
[0002] With the development of onshore and coastal wind resources becoming saturated, more and more wind turbine manufacturers are turning their attention to the deep sea field, but they are facing the problem of difficult maintenance due to the short window period of going to sea and the frequent occurrence of harsh environments, and the demand for continuous lubrication of the wind turbine generator system after power failure is increasingly prominent.
[0003] The main bearing is an important part of the wind turbine generator system, and its operating condition determines the reliability and safety of the wind turbine generator system. After the main bearing of the wind turbine generator system is powered off, the blades still have a small amplitude of swing, and still need a small amount of lubricating oil for lubrication to prevent the wind turbine generator system from failing due to interruption of main bearing lubrication. Therefore, it is particularly important to ensure that the main bearing can be normally lubricated after the wind turbine generator system is powered off.
[0004] At present, the main bearing of the wind turbine generator system mainly adopts grease lubrication and oil lubrication. In the case of short power failure, the lubrication pump can be temporarily powered by an uninterruptible power supply (UPS) to maintain its operation. However, both of these methods rely on the operation of the oil pump motor, i.e. the wind turbine generator system needs to be normally powered or have a backup power supply. Once the wind turbine generator system is powered off for a long time and the backup power supply is exhausted, the existing lubrication system will stop working, and the main bearing will face the risk of lubrication interruption.
[0005] Therefore, there is an urgent need for a solution that can provide reliable lubrication for the main bearing in the case of power failure of the wind turbine generator system without backup power supply. SUMMARY
[0006] The present application aims to overcome the shortcomings of the prior art and provide a main bearing oil lubrication device of a wind turbine generator system and a control method thereof, which can provide reliable lubrication for the main bearing in the case of power failure of the wind turbine generator system without backup power supply, thereby avoiding wind turbine generator system failure due to interruption of main bearing lubrication.
[0007] The object of the present application is achieved by the following technical solutions: The application discloses a main bearing oil lubricating device of a wind turbine, which comprises a main lubricating circuit, a power-off lubricating circuit, an oil supplementing circuit, a backup power supply and a control unit; the main lubricating circuit comprises a main oil tank arranged in the main machine of the wind turbine and a motor pump group connected with an oil outlet pipeline of the main oil tank, and is used for driving the lubricating oil in the main oil tank to flow into the main bearing to realize oil supply lubrication of the main bearing when the wind turbine is powered off and the backup power supply is not exhausted; the power-off lubricating circuit comprises a high-position oil tank arranged at the highest point in the main machine of the wind turbine, a normally-open electromagnetic valve arranged on an oil outlet pipeline of the high-position oil tank and a liquid level sensor arranged in the high-position oil tank, is used for monitoring the liquid level information of the high-position oil tank in real time, and is used for making the lubricating oil in the high-position oil tank flow into the main bearing to realize oil supply lubrication of the main bearing when the wind turbine is powered off and the backup power supply is exhausted; the oil supplementing circuit comprises a normally-closed electromagnetic valve, one end of the normally-closed electromagnetic valve is connected with an oil inlet pipeline of the high-position oil tank, the other end of the normally-closed electromagnetic valve is connected with an oil outlet pipeline of the motor pump group, and the normally-closed electromagnetic valve is used for supplementing the lubricating oil to the high-position oil tank; the backup power supply is electrically connected with the control unit, the motor pump group, the liquid level sensor, the normally-open electromagnetic valve and the normally-closed electromagnetic valve respectively, and is used for power supply; the control unit is communicatively connected with the motor pump group, the liquid level sensor, the normally-open electromagnetic valve and the normally-closed electromagnetic valve respectively, is used for controlling the motor pump group to start when the wind turbine is powered off and the backup power supply is not exhausted, and then lubricating the main bearing through the main lubricating circuit, and is used for controlling the normally-open electromagnetic valve to lose power and open when the wind turbine is powered off and the backup power supply is exhausted, and then lubricating the main bearing through the power-off lubricating circuit, and is used for judging whether the liquid level information collected by the liquid level sensor exceeds a preset warning value, and then controlling the on-off of the oil supplementing circuit according to the judgment result.
[0008] Further, the high-position oil tank is internally provided with a temperature sensor and a heater, the temperature sensor and the heater are electrically connected with the backup power supply respectively and are communicatively connected with the control unit respectively, the temperature sensor is used for monitoring the temperature of the lubricating oil in the high-position oil tank in real time, and feeds back to the control unit when the temperature of the lubricating oil is lower than a set value, and then the control unit controls the heater to heat the lubricating oil, so as to prevent the lubricating oil from failing to flow to the main bearing.
[0009] Further, the high-position oil tank is internally provided with an air filter, the air filter is used for ensuring that the air pressure in the high-position oil tank is stable, and then the lubricating oil can flow into the main bearing internally by gravity.
[0010] Further, the liquid level sensor is a floating ball type liquid level sensor.
[0011] Further, the power-off lubricating circuit further comprises a throttle valve, the throttle valve is arranged between the normally-open electromagnetic valve and the main bearing, and is used for adjusting the oil supply flow between the high-position oil tank and the main bearing.
[0012] Further, the main lubrication circuit further comprises a one-way valve, which is arranged on the oil outlet pipeline of the motor pump set.
[0013] Further, the oil outlet end of the one-way valve is further provided with a filter.
[0014] A control method of a main bearing oil lubrication device of a wind turbine generator system is as follows: Under normal operating conditions of the wind turbine generator system, the main bearing oil lubrication device does not work, and the main bearing is lubricated by the transmission chain lubrication system of the wind turbine generator system; When the wind turbine generator system is powered off and the backup power source is not exhausted, the motor pump set is started by the control unit, the normally open electromagnetic valve is powered off and closed, and the main bearing is lubricated by the main lubrication circuit; at the same time, whether the liquid level information collected by the liquid level sensor exceeds the preset warning value is judged by the control unit, and then the on-off of the oil supplement circuit is controlled according to the judgment result; After the wind turbine generator system is powered off and the backup power source is exhausted, the normally open electromagnetic valve is powered off and opened by the control unit, and the main bearing is lubricated by the powered-off lubrication circuit; After the wind turbine generator system is powered on, the backup power source is charged; after the backup power source is fully charged, whether the liquid level information collected by the liquid level sensor exceeds the preset warning value is judged by the control unit, and then the on-off of the oil supplement circuit is controlled according to the judgment result.
[0015] Further, whether the liquid level information collected by the liquid level sensor exceeds the preset warning value is judged by the control unit, and then the on-off of the oil supplement circuit is controlled according to the judgment result, which is as follows: If the preset warning value is not exceeded, the normally closed electromagnetic valve is powered on and opened by the control unit, the oil supplement circuit is connected, the oil supplement circuit is used to supplement oil to the high oil tank until the liquid level reaches the preset warning value, at this time the normally closed electromagnetic valve is powered off and closed by the control unit, the oil supplement circuit is disconnected, and the high oil tank does not need to be supplemented; if the preset warning value is exceeded, the normally closed electromagnetic valve is kept powered off by the control unit, the oil supplement circuit is disconnected, and the high oil tank does not need to be supplemented.
[0016] Compared with the prior art, the present application has the following advantages and beneficial effects: The present application can meet the lubrication demand of the main bearing when the unit is powered off for a short time, and through the design of the powered-off lubrication circuit, reliable lubrication can still be provided to the main bearing when the unit is powered off for a long time and the backup power source is exhausted, thereby effectively avoiding unit failure caused by interruption of main bearing lubrication; in addition, through the design of the oil supplement circuit, the high oil tank can be ensured to be always in a full oil state before the unit is powered off for a long time and the backup power source is exhausted, thereby being able to respond to the lubrication demand in the sudden power-off operating condition at any time. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 The principle diagram of the main bearing oil lubricating device of the present application. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.
[0019] As Figure 1As shown, the embodiment provides a main bearing oil lubrication device of a wind turbine generator, which comprises a main lubrication circuit, a power-off lubrication circuit, an oil supplement circuit, a backup power supply 4 and a control unit 5 (a PLC control unit is adopted in the embodiment); the main lubrication circuit comprises a main oil tank 101 arranged in the main machine of the wind turbine generator and a motor pump set 102 connected with the oil outlet pipeline of the main oil tank 101, which is used to drive the lubricating oil in the main oil tank 101 to flow into the main bearing 6 to realize the oil supply lubrication of the main bearing 6 when the wind turbine generator is powered off and the backup power supply 4 is not exhausted; the power-off lubrication circuit comprises a high oil tank 201 arranged at the highest point in the main machine of the wind turbine generator, a normally open electromagnetic valve 202 arranged on the oil outlet pipeline of the high oil tank 201 and a liquid level sensor 203 arranged in the high oil tank 201, which is used to monitor the liquid level information of the high oil tank 201 in real time and make the lubricating oil in the high oil tank 201 flow into the main bearing 6 to realize the oil supply lubrication of the main bearing 6 when the wind turbine generator is powered off and the backup power supply 4 is exhausted; the liquid level sensor 203 in the embodiment is a float ball type liquid level sensor provided with a high liquid level alarm point; the oil supplement circuit comprises a normally closed electromagnetic valve 301, one end of which is connected with the oil inlet pipeline of the high oil tank 201 and the other end of which is connected with the oil outlet pipeline of the motor pump set 102, which is used to supplement the lubricating oil to the high oil tank 201; the backup power supply 4 is electrically connected with the control unit 5, the motor pump set 102, the liquid level sensor 203, the normally open electromagnetic valve 202 and the normally closed electromagnetic valve 301 respectively, which is used to supply power; the control unit 5 is communicatively connected with the motor pump set 102, the liquid level sensor 203, the normally open electromagnetic valve 202 and the normally closed electromagnetic valve 301 respectively, which is used to control the motor pump set 102 to start when the wind turbine generator is powered off and the backup power supply 4 is not exhausted, and then lubricate the main bearing 6 through the main lubrication circuit, and control the normally open electromagnetic valve 202 to lose power and open when the wind turbine generator is powered off and the backup power supply 4 is exhausted, and then lubricate the main bearing 6 through the power-off lubrication circuit, and judge whether the liquid level information collected by the liquid level sensor 203 exceeds the preset warning value, and then control the on-off of the oil supplement circuit according to the judgment result.
[0020] Specifically, the high oil tank 201 is internally provided with a temperature sensor 204 and a heater 205, the temperature sensor 204 and the heater 205 are electrically connected with the backup power supply 4 respectively and are communicatively connected with the control unit 5 respectively, the temperature of the lubricating oil in the high oil tank 201 is monitored in real time through the temperature sensor 204, and when the temperature of the lubricating oil is lower than the set value, it is fed back to the control unit 5, and then the heater 205 is controlled by the control unit 5 to heat the lubricating oil, so as to prevent the lubricating oil in the high oil tank 201 from flowing from the high oil tank 201 to the main bearing 6 due to too low temperature and causing the viscosity to increase under the low temperature working condition of the wind turbine generator.
[0021] Specifically, the high oil tank 201 is internally provided with an air filter 206, which ensures the stability of the air pressure inside the high oil tank 201, and thus enables the lubricating oil to flow into the main bearing 6 by gravity.
[0022] Specifically, the power-off lubrication circuit further comprises a throttle valve 207, which is arranged between the normally open electromagnetic valve 202 and the main bearing 6, and is used to adjust the oil supply flow between the high oil tank 201 and the main bearing 6; through preliminary tests, a suitable throttle diameter can be selected under the premise of meeting the minimum lubrication flow of the main bearing 6 after the wind turbine generator system is powered off.
[0023] Specifically, the main lubrication circuit further comprises a one-way valve 103, which is arranged on the oil outlet pipeline of the motor pump set 102, and the oil outlet end of the one-way valve 103 is further provided with a filter 104 for filtering impurities in the lubricating oil.
[0024] The embodiment also provides a control method of the main bearing oil lubrication device of the wind turbine generator system, which is specifically as follows: Under normal operating conditions of the wind turbine generator system, the main bearing oil lubrication device is not working, and the main bearing 6 is lubricated by the transmission chain lubrication system of the wind turbine generator system; When the wind turbine generator system is powered off and the backup power supply 4 is not exhausted, the motor pump set 102 is started by the control unit 5, the normally open electromagnetic valve 202 is powered off, and the main bearing 6 is lubricated by the main lubrication circuit; at the same time, whether the liquid level exceeds the preset warning value is judged according to the liquid level information collected by the liquid level sensor 203, and then the on-off of the oil supplement circuit is controlled according to the judgment result; When the wind turbine generator system is powered off and the backup power supply 4 is exhausted, the normally open electromagnetic valve 202 is powered off by the control unit 5, and the main bearing 6 is lubricated by the power-off lubrication circuit; After the wind turbine generator system is powered on, the backup power supply 4 is charged; after the backup power supply 4 is fully charged, whether the liquid level exceeds the preset warning value is judged according to the liquid level information collected by the liquid level sensor 203, and then the on-off of the oil supplement circuit is controlled according to the judgment result.
[0025] Specifically, whether the liquid level exceeds the preset warning value is judged according to the liquid level information collected by the liquid level sensor 203, and then the on-off of the oil supplement circuit is controlled according to the judgment result, which is specifically as follows: If the preset warning value is not exceeded, the normally closed electromagnetic valve 301 is controlled to be powered on by the control unit 5, the oil supplementing circuit is connected, oil is supplemented to the high oil tank 201 through the oil supplementing circuit, until the liquid level reaches the preset warning value, at this time the normally closed electromagnetic valve 301 is controlled to be powered off by the control unit 5, the oil supplementing circuit is disconnected, and the high oil tank 201 does not need to be supplemented with oil; if the preset warning value is exceeded, the normally closed electromagnetic valve 301 is controlled to be powered off by the control unit 5, the oil supplementing circuit is disconnected, and the high oil tank 201 does not need to be supplemented with oil.
[0026] The above merely describes preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, within the scope disclosed by the present application, can make equivalent replacements or changes according to the technical scheme and the inventive concept of the present application, which all belong to the protection scope of the present application.
Claims
1. A main bearing oil lubrication device of a wind turbine generator system, characterized by: The application relates to a lubricating device for a main bearing of a wind turbine generator set, which comprises a main lubricating circuit, a power-off lubricating circuit, an oil supplementing circuit, a backup power supply and a control unit; the main lubricating circuit comprises a main oil tank arranged in the main machine of the wind turbine generator set and a motor pump group connected with an oil outlet pipeline of the main oil tank, is used for driving lubricating oil in the main oil tank to flow into the main bearing to realize oil supply lubrication of the main bearing when the wind turbine generator set is powered off and the backup power supply is not exhausted; the power-off lubricating circuit comprises a high-position oil tank arranged at the highest point in the main machine of the wind turbine generator set, a normally-open electromagnetic valve arranged on an oil outlet pipeline of the high-position oil tank and a liquid level sensor arranged in the high-position oil tank, is used for monitoring liquid level information of the high-position oil tank in real time, and is used for making lubricating oil in the high-position oil tank flow into the main bearing to realize oil supply lubrication of the main bearing when the wind turbine generator set is powered off and the backup power supply is exhausted; the oil supplementing circuit comprises a normally-closed electromagnetic valve, one end of the normally-closed electromagnetic valve is connected with an oil inlet pipeline of the high-position oil tank, the other end of the normally-closed electromagnetic valve is connected with an oil outlet pipeline of the motor pump group, and the normally-closed electromagnetic valve is used for supplementing lubricating oil to the high-position oil tank; the backup power supply is electrically connected with the control unit, the motor pump group, the liquid level sensor, the normally-open electromagnetic valve and the normally-closed electromagnetic valve respectively and is used for power supply; the control unit is communicatively connected with the motor pump group, the liquid level sensor, the normally-open electromagnetic valve and the normally-closed electromagnetic valve respectively, is used for controlling the motor pump group to start when the wind turbine generator set is powered off and the backup power supply is not exhausted, and then lubricating the main bearing through the main lubricating circuit, and is used for controlling the normally-open electromagnetic valve to lose power and open when the wind turbine generator set is powered off and the backup power supply is exhausted, and then lubricating the main bearing through the power-off lubricating circuit, and judging whether the liquid level information collected by the liquid level sensor exceeds a preset warning value, and then controlling the oil supplementing circuit according to the judgment result.
2. A main bearing oil lubrication device for a wind turbine generator set according to claim 1, characterized in that: The high-position oil tank is internally provided with a temperature sensor and a heater, the temperature sensor and the heater are electrically connected with the backup power supply respectively and are communicatively connected with the control unit respectively, the temperature sensor is used for monitoring the lubricating oil temperature in the high-position oil tank in real time, the lubricating oil temperature is fed back to the control unit when the lubricating oil temperature is lower than a set value, and then the heater is controlled by the control unit to heat the lubricating oil, so that the lubricating oil cannot flow to the main bearing.
3. A main bearing oil lubrication device for a wind turbine generator set according to claim 1, characterized in that: The high-position oil tank is internally provided with an air filter, the air filter is used for ensuring that the air pressure in the high-position oil tank is stable, and then the lubricating oil can flow into the main bearing according to gravity.
4. A main bearing oil lubrication arrangement for a wind turbine generator unit as claimed in claim 1, characterized in that: The liquid level sensor is a float ball type liquid level sensor.
5. A main bearing oil lubrication arrangement for a wind turbine generator unit as claimed in claim 1, characterized in that: The power-off lubricating circuit further comprises a throttle valve, the throttle valve is arranged between the normally-open electromagnetic valve and the main bearing and is used for adjusting the oil supply flow between the high-position oil tank and the main bearing.
6. A main bearing oil lubrication arrangement for a wind turbine generator unit as claimed in claim 1, characterized in that: The main lubricating circuit further comprises a one-way valve, the one-way valve is arranged on an oil outlet pipeline of the motor pump group.
7. A main bearing oil lubrication arrangement for a wind turbine generator unit as claimed in claim 6, characterized in that: The oil outlet end of the one-way valve is further provided with a filter.
8. A method of controlling a main bearing oil lubrication device of a wind turbine generator system according to any one of claims 1 to 7, characterized in that, Specifically as follows: The main bearing oil lubricating device does not work under normal operation conditions of the wind turbine generator set, and the main bearing is lubricated through a transmission chain lubricating system of the wind turbine generator set. When the wind turbine is powered off and the backup power is not exhausted, the motor pump group is started by the control unit, the normally open electromagnetic valve is powered on and closed, and the main bearing is lubricated through the main lubrication circuit; at the same time, the control unit determines whether the liquid level exceeds the preset warning value according to the liquid level information collected by the liquid level sensor, and then controls the on-off of the oil supplement circuit according to the determination result; When the wind turbine is powered off and the backup power is exhausted, the normally open electromagnetic valve is powered off and opened by the control unit, and the main bearing is lubricated through the powered-off lubrication circuit; After the wind turbine is powered on, the backup power is charged; after the backup power is fully charged, the control unit determines whether the liquid level exceeds the preset warning value according to the liquid level information collected by the liquid level sensor, and then controls the on-off of the oil supplement circuit according to the determination result.
9. A control method of a main bearing oil lubrication device of a wind turbine generator system according to claim 8, characterized by, The control unit determines whether the liquid level exceeds the preset warning value according to the liquid level information collected by the liquid level sensor, and then controls the on-off of the oil supplement circuit according to the determination result, as follows: If the preset warning value is not exceeded, the normally closed electromagnetic valve is powered on by the control unit, the oil supplement circuit is connected, oil is supplemented to the high oil tank through the oil supplement circuit until the liquid level reaches the preset warning value, at this time the normally closed electromagnetic valve is powered off by the control unit, the oil supplement circuit is disconnected, and the high oil tank does not need to be supplemented with oil; if the preset warning value is exceeded, the normally closed electromagnetic valve is kept powered off by the control unit, the oil supplement circuit is disconnected, and the high oil tank does not need to be supplemented with oil.