Lubricating and cooling system for gearbox of wind turbine generator

Abstract

The embodiment of the utility model provides a lubricating and cooling system for a gearbox of a wind turbine generator, and relates to the field of lubricating systems. The wind turbine generator gearbox lubricating and cooling system comprises a gearbox containing lubricating oil, a first pipeline and a second pipeline, the first pipeline is connected to the gearbox, and a conveying assembly, a temperature detection piece and a control valve are sequentially arranged on the first pipeline in series; the second pipeline is connected to the first pipeline in parallel, and a first cooling assembly and a second cooling assembly which are used for cooling lubricating oil are arranged on the second pipeline in series. The control valve is used for controlling on-off of the first pipeline; a first one-way valve is arranged on the second pipeline and connected with the first cooling assembly in parallel, a second one-way valve is arranged on the second pipeline and connected with the second cooling assembly in parallel, and the communication pressure of the second one-way valve is larger than that of the first one-way valve. The utility model has the effect of improving the reliability of the cooling system.

Description

Technical Field

[0001] This utility model relates to the field of lubrication systems, and more specifically, to a lubrication and cooling system for a wind turbine gearbox. Background Technology

[0002] Currently, in the wind power sector, the gearbox lubrication and cooling systems of large-megawatt wind turbines are generally cooled by air-cooled systems for onshore units and by two-stage heat exchange cooling systems for offshore units.

[0003] The inventors discovered that when the water cooling system malfunctions, it can easily cause the gearbox to overheat; when the ambient temperature is low, it can easily cause the oil pressure on the gearbox side to be too high; thus leading to low reliability of the cooling system. Utility Model Content

[0004] The purpose of this invention is to provide a lubrication and cooling system for a wind turbine gearbox that can improve the reliability of the cooling system.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a wind turbine gearbox lubrication and cooling system, comprising:

[0007] The gearbox contains lubricating oil.

[0008] A first pipeline is connected to the gearbox. A conveying assembly, a temperature detection element, and a control valve are sequentially connected in series on the first pipeline. The conveying assembly is used to draw lubricating oil from the gearbox and circulate it back into the gearbox along the first pipeline.

[0009] The second pipeline is connected in parallel to the first pipeline, and a first cooling component and a second cooling component for cooling the lubricating oil are connected in series on the second pipeline.

[0010] The control valve is used to control the opening and closing of the first pipeline and the second pipeline to control the flow of lubricating oil along the first pipeline or the second pipeline; a first check valve is provided in parallel with the first cooling component on the second pipeline, and a second check valve is provided in parallel with the second cooling component on the second pipeline, wherein the connecting pressure of the second check valve is greater than the connecting pressure of the first check valve.

[0011] In an optional embodiment, a filter assembly is further connected in series on the first pipeline, the filter assembly being used to filter the lubricating oil.

[0012] In an optional implementation, the filtration assembly includes a filter and a bypass valve connected in parallel.

[0013] In an optional embodiment, the conveying assembly includes a motor and an electric pump, the electric pump being connected to the first pipeline, and the motor being connected to the electric pump.

[0014] In an optional implementation, the connection pressure of the first check valve is 5 bar; the connection pressure of the second check valve is 8 bar.

[0015] In an optional embodiment, the temperature sensing element is electrically connected to the control valve.

[0016] In an optional embodiment, the temperature detection element is used to detect the oil temperature of the lubricating oil in the first pipeline, and the control valve is used to control the first pipeline to be connected and the second pipeline to be disconnected when the oil temperature is below 25°C.

[0017] In an optional embodiment, the temperature detection element is used to detect the oil temperature of the lubricating oil in the first pipeline, and the control valve is used to control the connection between the first pipeline and the second pipeline when the oil temperature is between 25°C and 40°C.

[0018] In an optional embodiment, the temperature detection element is used to detect the oil temperature of the lubricating oil in the first pipeline, and the control valve is used to control the first pipeline to disconnect and the second pipeline to connect when the oil temperature is greater than 40°C.

[0019] In an optional embodiment, a gearbox distributor is connected in series on the first pipeline.

[0020] The beneficial effects of the wind turbine gearbox lubrication and cooling system provided in this embodiment of the invention include:

[0021] By setting up a first pipeline and a second pipeline, and controlling the opening and closing of the first and second pipelines through a control valve, when the oil temperature is below 25℃, the control valve controls the lubricating oil to flow directly back to the gearbox through the first pipeline; when the lubricating oil temperature is between 25℃ and 40℃, the lubricating oil flows through the first and second pipelines for partial cooling; when the lubricating oil temperature is above 40℃, the first pipeline is disconnected and the second pipeline is connected, thereby cooling the lubricating oil through the first and second cooling components; simultaneously, when the ambient temperature is low and the system pressure continues to increase, the first and second check valves can be opened, allowing the lubricating oil to flow directly back to the gearbox through the first and second check valves, ensuring the safe operation of the system and thus improving the reliability of the cooling system. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the wind turbine gearbox lubrication and cooling system provided in this embodiment.

[0024] Icons: 100 - Gearbox; 200 - First pipeline; 210 - Delivery assembly; 211 - Motor; 212 - Electric pump; 220 - Temperature sensor; 230 - Control valve; 240 - Filter assembly; 241 - Filter; 242 - Bypass valve; 250 - Gearbox distributor; 300 - Second pipeline; 310 - First cooling assembly; 320 - Second cooling assembly; 330 - First check valve; 340 - Second check valve. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0030] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0031] Currently, in the wind power sector, the gearbox lubrication systems of large-megawatt wind turbine generators typically employ air-cooled systems for onshore units and two-stage cooling systems for offshore units. However, current large-megawatt offshore wind turbine generators often use conventional stainless steel plate heat exchangers, which have low heat exchange efficiency and are prone to causing high gearbox temperatures when the water cooling system malfunctions. Furthermore, low ambient temperatures can lead to excessively high oil pressure in the gearbox, resulting in low reliability of the cooling system.

[0032] To address the aforementioned technical problems, this utility model provides a gearbox lubrication and cooling system for wind turbines, applicable to large-megawatt offshore generator sets, to improve the reliability of the gearbox lubrication and cooling system.

[0033] The following describes in detail the overall structure, working principle, and technical effects of the wind turbine gearbox lubrication and cooling system provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0034] Please refer to Figure 1 This utility model provides a wind turbine gearbox lubrication and cooling system, including a gearbox 100, a first pipe 200, and a second pipe 300. The gearbox 100 contains lubricating oil for lubricating the gearbox 100. The first pipe 200 is connected to the gearbox 100, with both ends connected to the gearbox 100. A conveying assembly 210, a temperature detection element 220, and a control valve 230 are sequentially connected in series on the first pipe 200. The conveying assembly 210 draws lubricating oil from the gearbox 100 and drives the lubricating oil to flow along the first pipe 200 and return to the gearbox 100. The second pipe 300 is connected in parallel to the first pipe 200. A first cooling assembly 310 and a second cooling assembly 320 are connected in series on the second pipe 300, and the first cooling assembly 310 and the second cooling assembly 320 are used to cool the flowing lubricating oil. Furthermore, the control valve 230 is used to control the opening and closing of the first pipeline 200 and the second pipeline 300, so that when the lubricating oil temperature is at the first set temperature, the lubricating oil flows directly back to the gearbox 100 along the first pipeline 200 without cooling; when the lubricating oil temperature is higher than the set temperature, the lubricating oil flows to the gearbox 100 along the second pipeline 300, so that the lubricating oil is cooled by the first cooling component 310 and the second cooling component 320.

[0035] Specifically, in this embodiment, when the lubricating oil temperature is below 25°C, the control valve 230 controls the first pipeline 200 to open and the second pipeline 300 to close, allowing the lubricating oil to flow directly back into the gearbox 100. When the lubricating oil temperature is between 25°C and 40°C, the control valve 230 controls both the first pipeline 200 and the second pipeline 300 to open, allowing some of the lubricating oil to be cooled by the first cooling assembly 310 and the second cooling assembly 320. When the lubricating oil temperature is above 40°C, the control valve 230 controls the first pipeline 200 to close and the second pipeline 300 to open, allowing all the lubricating oil to be cooled by the first cooling assembly 310 and the second cooling assembly 320. In other embodiments, the specific set temperature can be adaptively selected according to actual conditions.

[0036] Furthermore, a first check valve 330 is connected in parallel with the first cooling component 310 on the second pipeline 300, and a second check valve 340 is connected in parallel with the second cooling component 320 on the second pipeline 300. The connecting pressure of the second check valve 340 is greater than that of the first check valve 330. During the operation of large-megawatt offshore wind turbines, situations may arise where the turbine is shut down and restarted. Due to the low ambient temperature at sea, the lubricating oil temperature drops to ambient temperature after shutdown, increasing its viscosity. When the turbine restarts, the lubricating oil temperature in the gearbox 100 rises rapidly, while the lubricating oil in the oil circuit remains at a lower temperature, has higher viscosity, and flows less smoothly, leading to an increase in oil pressure within the oil circuit, resulting in a phenomenon of high oil temperature but high oil pressure within the oil circuit. At this time, the lubricating oil is diverted through the first check valve 330 and the second check valve 340. On the one hand, this prevents the oil pressure in the oil circuit from rising continuously, and on the other hand, it allows the lubricating oil to circulate in the oil circuit as soon as possible, so as to prevent the lubricating oil temperature in the gearbox 100 from getting too high, thereby ensuring the safe operation of the system and improving the reliability of the cooling system.

[0037] Furthermore, traditional gearbox lubrication system radiators generally use stainless steel plate structures, which are heavy and large in size. The heat exchanger of this utility model uses an aluminum plate structure, which reduces the size and weight of the heat exchanger.

[0038] Please refer to Figure 1 In some optional embodiments, a filter assembly 240 is also connected in series on the first pipeline 200. The filter assembly 240 is used to filter the flowing lubricating oil. Further, the filter assembly 240 includes a filter 241 and a bypass valve 242 connected in parallel. The filter 241 filters the lubricating oil. When the filter 241 becomes clogged and the lubricating oil pressure in the first oil circuit continuously increases, the bypass valve 242 can be opened to prevent excessive pressure in the first oil circuit. The bypass valve 242 can be selected according to the required connection pressure.

[0039] Please refer to Figure 1In this embodiment, the conveying assembly 210 includes a motor 211 and an electric pump 212. The electric pump 212 is connected to the first pipeline 200, and the motor 211 is connected to the electric pump 212 and used to drive the electric pump 212. This facilitates the circulation of lubricating oil along the first oil path.

[0040] Please refer to Figure 1 The first check valve 330 has a connection pressure of 5 bar, and the second check valve 340 has a connection pressure of 8 bar. When the ambient temperature is low and the fan has stopped and restarted, the oil temperature in the gearbox 100 is high, but the oil pressure in the oil circuit is also high. When the oil pressure exceeds 5 bar, the first check valve 330 opens, and the lubricating oil flows directly through the first check valve 330 to the second check valve 340. When the oil pressure exceeds 8 bar, the second check valve 340 also opens, and the lubricating oil flows directly back into the gearbox 100. This prevents excessively high oil pressure and allows the lubricating oil to quickly return to the gearbox 100 for circulation and cooling, preventing excessively high oil temperature inside the gearbox 100, ensuring safe system operation, and improving the reliability of the cooling system.

[0041] Please refer to Figure 1 In this embodiment, the temperature detection element 220 is electrically connected to the control valve 230. The temperature detection element 220 detects the temperature of the lubricating oil in the first oil circuit. When the oil temperature is below 25°C, the control valve 230 controls the first pipeline 200 to be connected, and the lubricating oil flows directly back to the gearbox 100 through the first pipeline 200. When the oil temperature is between 25°C and 40°C, the control valve 230 controls the first pipeline 200 to be connected to the second pipeline 300, and the lubricating oil flows back to the gearbox 100 through the first pipeline 200 and the second pipeline 300. Some of the lubricating oil is cooled by passing through the first cooling assembly 310 and the second cooling assembly 320. When the oil temperature is above 40°C, the control valve 230 controls the second pipeline 300 to be connected and the first pipeline 200 to be disconnected, so that all the lubricating oil is cooled by passing through the first cooling assembly 310 and the second cooling assembly 320.

[0042] In this embodiment, the temperature detection element 220 includes a temperature sensor, and the control valve 230 includes a solenoid valve. In other embodiments, the temperature detection element 220 may also be a temperature detection device such as a resistance temperature detector (RTD) sensor, and the control valve 230 may also be a device that controls the on / off state of an oil circuit, such as an electric valve or a hydraulic check valve. The specific structural forms of the temperature detection element 220 and the control valve 230 are not limited here.

[0043] Please refer to Figure 1 Furthermore, a gearbox distributor 250 is connected in series on the first pipeline 200 to distribute lubricating oil to multiple lubrication points of the gearbox 100, so that the lubricating oil can reach each part that needs lubrication evenly and accurately.

[0044] In summary, the implementation principle of the wind turbine gearbox lubrication and cooling system provided by this utility model is as follows: By setting up a first pipeline 200 and a second pipeline 300, and controlling the opening and closing of the first pipeline 200 through a control valve 230, when the oil temperature is below 25℃, the control valve 230 controls the first pipeline 200 to be connected and the second pipeline 300 to be disconnected, so that the lubricating oil flows directly back to the gearbox 100 along the first pipeline 200; when the lubricating oil temperature is 25℃-40℃, the control valve 230 controls the first pipeline 200 and the second pipeline 300 to be connected, so that some of the lubricating oil is cooled by the first cooling component 310 and the second cooling component 320 and then flows back to the gearbox 100; when the lubricating oil temperature is between 25℃ and 40℃, the control valve 230 controls the first pipeline 200 and the second pipeline 300 to be connected, so that some of the lubricating oil flows back to the gearbox 100 after being cooled by the first cooling component 310 and the second cooling component 32 ... When the oil temperature exceeds 40℃, control valve 230 disconnects the first pipeline 200 and connects the second pipeline 300, allowing all lubricating oil to be cooled through the first cooling assembly 310 and the second cooling assembly 320, thus improving the cooling effect. Simultaneously, when the ambient temperature is low, the fan restarts, the oil temperature in the gearbox 100 is high, and the oil pressure in the oil circuit increases, the first one-way valve 330 and the second one-way valve 340 can open, allowing the lubricating oil to flow directly back to the gearbox 100 through the first one-way valve 330 and the second one-way valve 340. This prevents excessively high oil pressure and ensures that the lubricating oil in the gearbox 100 can be cooled in time, guaranteeing the safe operation of the system and improving the reliability of the cooling system.

[0045] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A wind turbine generator set gearbox lubrication cooling system characterized by, The application relates to a lubricating oil system. The lubricating oil system comprises a gear box containing lubricating oil; a first pipeline connected to the gear box, wherein a conveying assembly, a temperature detecting element and a control valve are sequentially connected in series on the first pipeline, the conveying assembly is used for pumping lubricating oil out of the gear box, and the lubricating oil flows along the first pipeline and returns to the gear box; a second pipeline connected in parallel to the first pipeline, wherein a first cooling assembly and a second cooling assembly for cooling lubricating oil are connected in series on the second pipeline; wherein the control valve is used for controlling the on-off of the first pipeline and the second pipeline, so as to control the flow of lubricating oil along the first pipeline or the second pipeline; a first one-way valve is arranged in parallel to the first cooling assembly on the second pipeline, a second one-way valve is arranged in parallel to the second cooling assembly on the second pipeline, and the communication pressure of the second one-way valve is greater than that of the first one-way valve. A filtering assembly is further arranged in series on the first pipeline, and the filtering assembly is used for filtering lubricating oil. The filtering assembly comprises a filter and a bypass valve arranged in parallel. The conveying assembly comprises a motor and an electric pump, the electric pump is connected to the first pipeline, and the motor is connected to the electric pump.

2. A wind turbine gearbox lubrication cooling system according to claim 1, wherein, The communication pressure of the first one-way valve is 5 bar, and the communication pressure of the second one-way valve is 8 bar.

3. A wind turbine gearbox lubrication cooling system according to claim 2, wherein, The temperature detecting element and the control valve are electrically connected.

4. The wind turbine gearbox lubrication cooling system according to claim 1, wherein, The temperature detecting element is used for detecting the oil temperature of lubricating oil in the first pipeline, and the control valve is used for controlling the first pipeline to be connected and the second pipeline to be disconnected when the oil temperature is lower than 25 DEG C.

5. The wind turbine gearbox lubrication cooling system according to claim 1, wherein, The temperature detecting element is used for detecting the oil temperature of lubricating oil in the first pipeline, and the control valve is used for controlling the first pipeline and the second pipeline to be connected when the oil temperature is 25 DEG C.-40 DEG C.

6. The wind turbine gearbox lubrication cooling system according to claim 1, wherein, The temperature detecting element is used for detecting the oil temperature of lubricating oil in the first pipeline, and the control valve is used for controlling the first pipeline to be disconnected and the second pipeline to be connected when the oil temperature is greater than 40 DEG C.

7. A wind turbine gearbox lubrication cooling system according to claim 6, wherein, A gear box distributor is arranged in series on the first pipeline.

8. The wind turbine gearbox lubrication cooling system according to claim 6, wherein, ​ 9. The wind turbine gearbox lubrication cooling system according to claim 6, wherein, ​ 10. The wind turbine gearbox lubrication cooling system according to claim 1, wherein, ​

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