Wind turbine auxiliary pre-lubrication system, method, and wind turbine
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-02
- Publication Date
- 2026-08-11
AI Technical Summary
[0003]集成式传动链系统主轴承、齿轮箱共用一套润滑系统且同步进行润滑，油箱通常采用齿轮箱润滑油箱，在油温低于油泵工作温度时（如油温时），无法泵油对轴承、齿轮箱进行润滑
[0014]本发明通过在主油箱的基础上设计小型化的辅助润滑油箱，并集成设置内部加热器和相应的传感器件，根据传感器信号分别控制一个油泵电机启停和三个电磁阀通断实现辅助预润滑系统快速预热、预润滑、补充并存储润滑油三种功能切换，解决机组低温启机时主润滑系统无法及时启动导致的轴承干摩擦问题；系统具有结构上的高度集成化和在控制方面的高度自动化特点。
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Figure CN122543948A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wind power generation technology, and more specifically to an auxiliary pre-lubrication system, method, and wind turbine generator set. Background Technology
[0002] In recent years, wind turbine generators have shown a trend towards larger sizes, and more and more wind turbine generators are adopting integrated drive trains. As the load on the generator units increases, traditional rolling bearings are no longer sufficient to meet the requirements, and the use of sliding bearings with greater load capacity has become a new trend. However, sliding bearings have higher lubrication requirements, and inadequate lubrication can cause significant damage to the bearings. Therefore, timely and proper lubrication of integrated drive train systems has become increasingly important.
[0003] The integrated drivetrain system shares a lubrication system for the main bearings and gearbox, and lubricates them synchronously. The oil tank is typically a gearbox lubrication oil tank. When the oil temperature is lower than the oil pump's operating temperature (e.g., oil temperature...), When the unit is shut down for an extended period and needs to be switched to operation, the main bearings and low-speed bearings of the gearbox, which bear heavy loads, are prone to wear due to sudden rotation and increased local stress caused by prolonged lack of lubrication. This reduces the unit's service life. Therefore, providing specialized lubricating oil to critical bearing components such as the main bearings and low-speed bearings of the gearbox in the integrated drivetrain system becomes particularly important in low-temperature environments and during extended shutdowns. Summary of the Invention
[0004] The purpose of this invention is to address the problems existing in the prior art by proposing an auxiliary pre-lubrication system, method, and wind turbine.
[0005] To achieve the above objectives, in a first aspect, the present invention proposes an auxiliary pre-lubrication system for wind turbine generators, comprising an auxiliary lubricating oil tank, an oil pump, a motor, a first solenoid valve, a second solenoid valve, a third solenoid valve, and a control module. The auxiliary lubricating oil tank is equipped with a heater, a temperature sensor, and a level switch. The oil inlet of the first solenoid valve is connected to the oil supply port of the auxiliary lubricating oil tank, and the oil outlet is connected to the inlet of the oil pump. The oil inlet of the second solenoid valve is connected to the oil supply port of the main oil tank of the main lubrication system, and the oil outlet is connected to the inlet of the oil pump. The oil inlet of the third solenoid valve is connected to the outlet of the oil pump. The first oil outlet is connected to each pre-lubrication point, and the second oil outlet is connected to the return port of the auxiliary lubricating oil tank. The motor, the first solenoid valve, the second solenoid valve, the third solenoid valve, the heater, the temperature sensor, and the level switch are electrically connected to the control module.
[0006] Furthermore, the oil supply port and oil return port of the auxiliary lubricating oil tank are respectively located at two diagonally opposite positions of the auxiliary lubricating oil tank.
[0007] Furthermore, the main oil tank is the main gearbox lubricating oil tank of the unit, and the auxiliary lubricating oil tank is located on the side wall or bottom of the main oil tank.
[0008] Furthermore, a heater is provided inside the main oil tank, and the oil supply port of the main oil tank is located close to the heater.
[0009] Furthermore, the pre-lubrication points include the main bearing lubrication points and the gearbox low-speed end bearing lubrication points.
[0010] Furthermore, heating tape is wrapped around the pipeline between the first oil outlet of the third solenoid valve (7) and each pre-lubrication point, the pipeline between the oil outlet of the second solenoid valve (14) and the inlet of the oil pump (2), and the pipeline between the oil outlet of the first solenoid valve (8) and the inlet of the oil pump (2).
[0011] Furthermore, the wind turbine auxiliary pre-lubrication system also includes an oil filter disposed between the oil pump and the third solenoid valve.
[0012] Furthermore, the wind turbine auxiliary pre-lubrication system also includes an overflow valve disposed between the outlet of the oil pump and the auxiliary lubricating oil tank.
[0013] Secondly, the present invention provides a wind turbine auxiliary pre-lubrication method implemented through the above-mentioned wind turbine auxiliary pre-lubrication system. The prerequisite for implementing this method is that the turbine needs to be started under low temperature conditions and the temperature of the main oil tank sump of the main lubrication system is lower than the starting temperature of the electric pump of the main lubrication system. The wind turbine low-temperature start-up pre-lubrication method includes the following steps: Turn on the heater in the auxiliary lubrication tank to preheat the oil; Open the first solenoid valve, and close the first oil outlet of the third solenoid valve and open the second oil outlet. Start the oil pump motor to allow the oil to circulate in the auxiliary lubricating oil tank. When the temperature sensor detects that the temperature of the auxiliary lubricating oil tank reaches the lubrication temperature set value, the heater is turned off and the second oil outlet of the third solenoid valve is closed while the first oil outlet is open. When the level switch triggers a low level alarm, the oil pump motor is shut off; When the temperature of the main oil tank of the main lubrication system rises to the starting temperature of the oil pump motor of the auxiliary lubrication system, the first solenoid valve is closed, the second solenoid valve is opened, the first oil outlet of the third solenoid valve is closed and the second oil outlet is open, and the oil pump motor is started. When the level switch triggers a high level alarm, the oil pump motor and the second solenoid valve are shut off. If further auxiliary pre-lubrication is required, repeat the above steps. If not, the auxiliary pre-lubrication is completed, and wait for the next auxiliary pre-lubrication instruction.
[0014] This invention designs a miniaturized auxiliary lubricating oil tank based on the main oil tank, and integrates an internal heater and corresponding sensors. Based on the sensor signals, it controls the start and stop of an oil pump motor and the on / off state of three solenoid valves to achieve three functions of the auxiliary pre-lubrication system: rapid preheating, pre-lubrication, and replenishment and storage of lubricating oil. This solves the problem of dry bearing friction caused by the main lubrication system failing to start in time when the unit starts at low temperatures. The system features a high degree of structural integration and a high degree of automation in control. Attached Figure Description
[0015] The following figures are included as part of this invention for understanding its principles. The figures illustrate embodiments of the invention and their descriptions, serving to explain the apparatus and principles of the invention. In the figures, Figure 1 This is a schematic diagram of the wind turbine drive chain lubrication system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the auxiliary pre-lubrication system for wind turbines according to an embodiment of the present invention; Figure 3 This is a flowchart of an auxiliary pre-lubrication method for wind turbines according to an embodiment of the present invention. Detailed Implementation
[0016] The present application will now be described in more detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly and are not intended to limit the scope of protection of the present application.
[0017] This invention provides an auxiliary pre-lubrication system for wind turbine generators. For example... Figure 1 and Figure 2 As shown, the system includes an auxiliary lubricating oil tank 13, an oil pump 2, a motor 1, a first solenoid valve 8, a second solenoid valve 14, a third solenoid valve 7, and a control module. The auxiliary lubricating oil tank 13 is equipped with heaters 11.1 and 11.2, a temperature sensor 10, and a level switch 12. The oil inlet of the first solenoid valve 8 is connected to the oil supply port of the auxiliary lubricating oil tank 13, and the oil outlet is connected to the inlet of the oil pump 2. The oil inlet of the second solenoid valve 14 is connected to the oil supply port of the main oil tank of the main lubrication system, and the oil outlet is connected to the inlet of the oil pump 2. The oil inlet (port A) of the third solenoid valve 7 is connected to the outlet of the oil pump 2. The first oil outlet (port B) is connected to each pre-lubrication point through multiple oil injection pipes, and the second oil outlet (port C) is connected to the return port of the auxiliary lubricating oil tank 13 through the return oil pipe 17. The motor 1, the first solenoid valve 8, the second solenoid valve 14, the third solenoid valve 7, the heater 11, the temperature sensor 10, and the level switch 12 are electrically connected to the control module. like Figure 2 As shown, the pre-lubrication system of this embodiment can be divided into an auxiliary oil tank system, an auxiliary oil tank supply pipeline system, and a pre-lubrication pipeline system. The auxiliary oil tank system stores, heats, circulates, monitors the condition of the oil, and provides pre-lubricating oil that meets the requirements. The auxiliary oil tank supply pipeline system connects the main oil tank and the auxiliary oil tank system, specifically including a second solenoid valve 14 and an auxiliary oil tank supply pipeline 15. The auxiliary oil tank supply pipeline 15 can be a hose assembly connecting the second solenoid valve 14 and the auxiliary oil tank system. The main oil tank of the main lubrication system is equipped with a heater and a temperature sensor. When the level switch 12 of the auxiliary lubrication oil tank 13 triggers a low level alarm, and the temperature sensor detects that the oil sump temperature of the main oil tank reaches the starting temperature of the oil pump motors 1 and 2 of the auxiliary pre-lubrication system, the second solenoid valve 14 and the oil pump motors 1 and 2 are opened, supplying oil from the main oil tank to the auxiliary lubrication oil tank 13. If the oil pre-stored in the auxiliary lubrication oil tank 13 reaches a low level threshold (level switch 12 alarms) after pre-lubrication, but the oil sump temperature in the main oil tank does not reach the starting temperature of the oil pump motors 1 and 2 of the auxiliary pre-lubrication system, then the oil pump motors 1 and 2 need to be shut down and the oil temperature in the main oil tank needs to be raised to the starting temperature of the oil pump motors 1 and 2 under the combined action of the heater and the unit's idling preheating before the second solenoid valve 14 and the oil pump motors 1 and 2 are opened to replenish oil in preparation for the next pre-lubrication operation; when the oil temperature in the main oil tank reaches the starting temperature of the electric pump of the main lubrication system, the main lubrication system takes over the lubrication work of the unit. The pre-lubrication pipeline system includes multiple oil injection pipelines 18, which are used to deliver the qualified oil provided by the auxiliary oil tank system to the key lubrication points of the transmission chain.
[0018] According to a preferred embodiment of the present invention, such as Figure 1 As shown, the oil supply port and return port of the auxiliary lubricating oil tank 13 are respectively located at two diagonally opposite positions on the tank body. Positioning the oil supply port and return port at two diagonally opposite positions on the tank body, which are far apart from each other, accelerates the circulation of the oil in the auxiliary lubricating oil tank during the heating process of the heater 11, making the oil heated more evenly and fully, and improving heating efficiency. The oil pump motor, through its connection with three solenoid valves, performs three functions in three stages: self-circulation heating of the oil in the auxiliary lubricating oil tank, pumping lubricating oil that meets the temperature requirements to each pre-lubrication point, and drawing lubricating oil from the main oil tank to the auxiliary lubricating oil tank when the amount of oil in the auxiliary lubricating oil tank is insufficient.
[0019] The main oil tank is the lubrication tank for the main gearbox of the generator set, enabling synchronous lubrication of the main bearings of the generator drive chain and the gears and bearings inside the gearbox. For example... Figure 2As shown, a heater is installed inside the main oil tank. The oil supply port of the main oil tank is located close to the internal heater, where the oil temperature is relatively high and the oil suction effect is good. Together with the motor 1 and the oil pump 2, it completes the oil replenishment of the auxiliary lubricating oil tank. The auxiliary lubricating oil tank 13 can be located on the side wall or bottom of the main oil tank. Placing the auxiliary lubricating oil tank 13 close to the main oil tank can shorten the connecting pipeline between the two to achieve better flow. If the unit is shut down for an extended period in a low-temperature environment, when it needs to switch back to operation, the main oil tank is large and contains a large amount of oil, making it difficult for the heater to heat the entire oil sump to the starting temperature of the lubrication pump in a short time. This results in the main oil pump of the main lubrication system being unable to draw oil normally, failing to quickly provide lubrication to the critical lubrication points of the unit's drivetrain. The auxiliary lubrication oil tank 13, however, is much smaller in volume and capacity than the main oil tank, allowing for rapid heating of the pre-stored oil. Furthermore, the diagonal reflux self-circulation during heating further improves heating efficiency, providing lubrication protection to critical lubrication points in advance during the unit's idling preheating. Preferably, the auxiliary lubrication oil tank 13 is equipped with an insulation layer. The pre-lubrication points of the pre-lubrication system include the main bearing lubrication points and the low-speed end bearing lubrication points of the gearbox; such as... Figure 1 As shown, in order to quickly supply lubricating oil to each lubrication point and reduce pump oil resistance, heating tape is wrapped around the pipeline between the first oil outlet of the third solenoid valve 7 and each pre-lubrication point, the pipeline between the oil outlet of the second solenoid valve 14 and the inlet of the oil pump 2, and the pipeline between the oil outlet of the first solenoid valve 8 and the inlet of the oil pump 2.
[0020] like Figure 2 As shown, the pre-lubrication system also includes an oil filter 6 installed between the oil pump 2 and the third solenoid valve 7 to ensure that the oil meets lubrication requirements and prevent wear on related components. To protect the oil filter 6, the system is equipped with a pressure switch 5 to detect the pressure difference across the oil filter 6. If the pressure difference exceeds the maximum allowable value of the oil filter 6, the pressure switch 5 triggers an alarm, prompting the filter to be replaced. Additionally, the auxiliary lubrication oil tank 13 is also equipped with an air filter 9. The pre-lubrication system also includes an overflow valve 3 installed between the outlet of the oil pump 2 and the auxiliary lubrication oil tank 13. The overflow valve 3 acts as a pressure protection element for the system. When the outlet pressure of the oil pump 2 exceeds the maximum operating pressure specified by the system, the overflow valve 3 opens, and the oil no longer passes through the oil filter 6 but flows directly back to the auxiliary lubrication oil tank 13 through the overflow pipe 16, preventing damage to system components due to high system pressure. Furthermore, a pressure sensor 4 is installed between the outlet of the oil pump 2 and the oil filter 6 to detect whether the system pressure is normal.
[0021] like Figure 3As shown, the present invention also provides a wind turbine auxiliary pre-lubrication method implemented through the above-mentioned wind turbine auxiliary pre-lubrication system. The prerequisite for implementing this method is that the turbine has lubrication requirements and the temperature of the main oil tank sump of the main lubrication system is lower than the starting temperature of the electric pump of the main lubrication system. The method includes the following steps: Turn on the heaters 11.1 and 11.2 of the auxiliary lubrication oil tank 13 to preheat the oil; Open the first solenoid valve 8, and close the first oil outlet of the third solenoid valve 7 and open the second oil outlet. Start the oil pump motors 1 and 2 to make the oil circulate in the auxiliary lubricating oil tank 13. When the temperature sensor 10 detects that the temperature of the auxiliary lubricating oil tank 13 reaches the lubrication temperature set value, the heater 11 is turned off and the second oil outlet of the third solenoid valve 7 is closed while the first oil outlet is opened. When the level switch 12 triggers a low level alarm, the oil pump motors 1 and 2 are shut down. The temperature of the main oil tank sump of the main lubrication system is detected. If it meets the opening temperature value of the auxiliary lubrication system oil pump motors 1 and 2, the first solenoid valve 8 is closed and the second solenoid valve 14 is opened, so that the first oil outlet of the third solenoid valve 7 is closed and the second oil outlet is open. The oil pump motors 1 and 2 are then started to fill the auxiliary lubrication oil tank 13 with oil. If the temperature of the main oil tank sump does not meet the opening temperature of the auxiliary lubrication oil pump motors 1 and 2, the oil replenishment operation is performed after the unit has been running for a period of time and the oil temperature of the main oil tank has risen to the opening temperature of the oil pump motors 1 and 2. When the liquid level switch 12 triggers a high liquid level alarm, the oil pump motors 1 and 2 and the second solenoid valve 14 are shut down. If further auxiliary pre-lubrication is required (e.g., the main lubrication system has not yet started normally), repeat the above steps. If not, the auxiliary pre-lubrication ends, and wait for the next auxiliary pre-lubrication command.
[0022] The wind turbine auxiliary pre-lubrication system of this invention can perform pre-lubrication operations independently of the main lubrication system during low-temperature start-up of the turbine. The system's preheating, pre-lubrication, and oil storage functions are switched by separately controlling the start / stop of one oil pump motor and the on / off states of three solenoid valves.
[0023] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software may depend on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of the embodiments of this disclosure.
[0024] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
[0025] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may only be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.
[0026] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the invention. Terms such as “part” and “component” appearing herein can refer to a single part or a combination of multiple parts. The terms “connection,” “installation,” “linking,” and “setting” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium; or a connection within two components. A feature described in one embodiment herein may be applied alone or in combination with other features to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise specified.
[0027] The present invention has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, those skilled in the art will understand that the present invention is not limited to the above embodiments, and many variations and modifications can be made based on the teachings of the present invention, all of which fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A wind turbine auxiliary pre-lubrication system, characterized in that, The system includes an auxiliary lubricating oil tank (13), an oil pump (2), a motor (1), a first solenoid valve (8), a second solenoid valve (14), a third solenoid valve (7), and a control module. The auxiliary lubricating oil tank (13) is equipped with a heater (11), a temperature sensor (10), and a level switch (12). The oil inlet of the first solenoid valve (8) is connected to the oil supply port of the auxiliary lubricating oil tank (13), and the oil outlet is connected to the inlet of the oil pump (2). The oil inlet of the second solenoid valve (14) is connected to the oil supply port of the main lubrication system's main oil tank. The oil outlet is connected to the inlet of the oil pump (2); the oil inlet (A) of the third solenoid valve (7) is connected to the outlet of the oil pump (2); the first oil outlet (B) is connected to each pre-lubrication point; the second oil outlet (C) is connected to the return oil port of the auxiliary lubricating oil tank (13); the oil pump (2), the first solenoid valve (8), the second solenoid valve (14), the third solenoid valve (7), the heater (11), the temperature sensor (10), and the liquid level switch (12) are electrically connected to the control module respectively.
2. The wind turbine auxiliary pre-lubrication system according to claim 1, characterized in that, The oil supply port and oil return port of the auxiliary lubricating oil tank (13) are respectively located at two diagonal positions of the auxiliary lubricating oil tank (13).
3. The wind turbine auxiliary pre-lubrication system according to claim 1, characterized in that, The main oil tank is the lubricating oil tank of the main gearbox of the unit, and the auxiliary lubricating oil tank (13) is located on the side wall or bottom of the main oil tank.
4. The wind turbine auxiliary pre-lubrication system according to claim 1, characterized in that, The main oil tank is equipped with a heater, and the oil supply port of the main oil tank is located close to the heater.
5. The wind turbine auxiliary pre-lubrication system according to claim 1, characterized in that, The pre-lubrication points include the main bearing lubrication points and the low-speed end bearing lubrication points of the gearbox.
6. The wind turbine auxiliary pre-lubrication system according to claim 1, characterized in that, The pipeline between the first oil outlet of the third solenoid valve (7) and each pre-lubrication point, the pipeline between the oil outlet of the second solenoid valve (14) and the inlet of the oil pump (2), and the pipeline between the oil outlet of the first solenoid valve (8) and the inlet of the oil pump (2) are all wrapped with heating tape.
7. The wind turbine auxiliary pre-lubrication system according to claim 1, characterized in that, The wind turbine auxiliary pre-lubrication system also includes an oil filter (6) disposed between the oil pump (2) and the third solenoid valve (7).
8. The wind turbine auxiliary pre-lubrication system according to claim 1, characterized in that, The wind turbine auxiliary pre-lubrication system also includes an overflow valve (3) located between the outlet of the oil pump (2) and the auxiliary lubricating oil tank (13).
9. A method for auxiliary pre-lubrication of a wind turbine implemented by the wind turbine auxiliary pre-lubrication system according to any one of claims 1-8, characterized in that, The prerequisite for implementing this method is that the unit needs to be started under low temperature conditions and the temperature of the main oil tank sump of the main lubrication system is lower than the starting temperature of the electric pump of the main lubrication system. The low temperature start-up pre-lubrication method for wind turbine units includes the following steps: Turn on the heaters (11.1, 11.2) of the auxiliary lubrication tank (13) to preheat the oil; Open the first solenoid valve (8), and close the first oil outlet (B) and open the second oil outlet (C) of the third solenoid valve (7), start the oil pump motor (1, 2), and make the oil circulate in the auxiliary lubricating oil tank (13); When the temperature sensor (10) detects that the temperature of the auxiliary lubricating oil tank (13) reaches the lubrication opening temperature setting value, the heater (11.1, 11.2) is turned off and the second oil outlet (C) of the third solenoid valve (7) is closed and the first oil outlet (B) is opened. When the liquid level switch (12) triggers a low liquid level alarm, the oil pump motors (1, 2) are turned off. When the temperature of the oil sump at the main oil tank supply port of the main lubrication system is raised to the opening temperature of the oil pump motor (1, 2) of the auxiliary lubrication system by the heater, the first solenoid valve (8) is closed and the second solenoid valve (14) is opened, so that the first oil outlet (B) of the third solenoid valve (7) is closed and the second oil outlet (C) is open, and the oil pump motor (1, 2) is started. When the level switch (12) triggers a high level alarm, the oil pump motor (1, 2) and the second solenoid valve (14) are shut off. If further auxiliary pre-lubrication is required, repeat the above steps. If not, the auxiliary pre-lubrication is completed, and wait for the next auxiliary pre-lubrication instruction.
10. A wind turbine generator employing an integrated drive train, characterized in that, The wind turbine includes the wind turbine auxiliary pre-lubrication system as described in any one of claims 1-8.