Maintenance device for a cooling system of a wind turbine and wind turbine

Abstract

The present disclosure provides a maintenance device of a cooling system of a wind turbine generator and a wind turbine generator, the maintenance device is connected in parallel with a cooling pump of the cooling system through a parallel pipeline, the maintenance device comprises a filtering assembly, a detection unit and a control unit, the filtering assembly is arranged on the parallel pipeline, and the filtering assembly comprises a first filtering unit and a bypass pipeline connected in parallel, wherein when the first filtering unit is enabled, the bypass pipeline is closed, and when the first filtering unit is disabled, the bypass pipeline is opened; the detection unit is arranged on the parallel pipeline and is configured to detect whether the first filtering unit is blocked; and the control unit is configured to receive a detection result of the detection unit and control the enabling and disabling of the first filtering unit and the opening and closing of the bypass pipeline, so as to perform online operation and maintenance on the cooling system, avoid shutdown during operation and maintenance of the cooling system, and reduce operation and maintenance costs caused by shutdown.

Description

Technical Field

[0001] This disclosure pertains to the field of wind power generation technology, and particularly relates to a maintenance device for a cooling system of a wind turbine generator set and a wind turbine generator set. Background Technology

[0002] Wind power, as a green energy source, has attracted much attention from society. To ensure the stable and long-term operation of wind turbine generators, a cooling system is included to cool the heat-generating components and prevent them from overheating and affecting the normal operation of the wind turbine generator.

[0003] During operation, wind turbine generators typically generate a large amount of heat in their heat-generating components, such as generators and converters. As the capacity of wind turbines continues to increase, the heat generated by these components also increases. Therefore, heat dissipation of these components is a crucial control factor for ensuring the normal operation of wind turbine generators.

[0004] Wind turbine generators typically employ air cooling and liquid cooling methods. Liquid cooling systems are particularly favored by users due to their high efficiency and stability. However, a failure in a liquid cooling system usually requires shutdown for maintenance, resulting in lost power generation and significant economic losses for the wind turbine generator. Utility Model Content

[0005] The main objective of this disclosure is to provide a maintenance device for the cooling system of a wind turbine generator set and a wind turbine generator set. The maintenance device can treat the coolant during the operation of the wind turbine generator set, thereby reducing the operation and maintenance costs of the wind turbine generator set cooling system.

[0006] To achieve the above objectives, this disclosure provides the following technical solution:

[0007] One aspect of this disclosure provides a maintenance device for a cooling system of a wind turbine generator set. The maintenance device is connected in parallel to the cooling pump of the cooling system via a parallel pipeline. The maintenance device includes a filter assembly, a detection unit, and a control unit. The filter assembly is disposed on the parallel pipeline and includes a first filter unit and a bypass pipeline connected in parallel. When the first filter unit is activated, the bypass pipeline is closed; when the first filter unit is deactivated, the bypass pipeline is activated. The detection unit is disposed on the parallel pipeline and configured to detect whether the first filter unit is blocked. The control unit is configured to receive the detection result from the detection unit and control the activation and deactivation of the first filter unit and the activation and deactivation of the bypass pipeline.

[0008] According to an exemplary embodiment of this disclosure, the maintenance device further includes a reversing power assembly disposed in the parallel pipeline and connected in series with the filter assembly, the reversing power assembly being used to control the flow direction of the medium in the parallel pipeline.

[0009] According to another exemplary embodiment of this disclosure, the reversing power assembly includes a bidirectional pump, and the control unit is further configured to control the operating direction of the bidirectional pump; or, the reversing power assembly includes a pump body and a four-way ball valve connected in series, and the control unit is further configured to control the four-way ball valve to change the flow direction of the medium in the parallel pipeline.

[0010] According to another exemplary embodiment of this disclosure, the detection unit includes at least one of a pressure sensor and a flow detection device.

[0011] According to an exemplary embodiment of the present disclosure, the maintenance device further includes a heating device disposed in the parallel pipeline, and the control unit is further configured to control the heating device to heat the medium flowing through the parallel pipeline.

[0012] Optionally, the filtration assembly further includes a second filtration unit, which includes an activated carbon adsorption filtration structure, an electrodialysis filtration structure, and a reverse osmosis filtration structure connected in series. The second filtration unit is connected in parallel with the first filtration unit. When the second filtration unit is activated, the first filtration unit is deactivated and the bypass pipeline is closed. When the first filtration unit is activated, the second filtration unit is deactivated and the bypass pipeline is closed. When both the first and second filtration units are deactivated, the bypass pipeline is connected.

[0013] Specifically, the detection unit further includes a conductivity sensor configured to detect the conductivity of the coolant; and / or, the detection unit further includes a turbidity sensor configured to detect the concentration of suspended particles in the coolant; and / or, the detection unit further includes a level sensor configured to detect the level height of the coolant; and / or, the detection unit further includes a pH sensor configured to detect the pH value of the coolant.

[0014] According to another exemplary embodiment of this disclosure, the maintenance device further includes a material storage and addition unit connected to the parallel pipeline and configured to store corrosion inhibitor, and the control unit is further configured to control the material storage and addition unit to add corrosion inhibitor to the parallel pipeline.

[0015] In another aspect, this disclosure provides a wind turbine generator set, the wind turbine generator set including a cooling system and maintenance devices as described above.

[0016] According to another embodiment of this disclosure, the cooling system includes a filter, wherein the pore size of the filter screen of the first filter unit is smaller than the pore size of the filter screen of the filter.

[0017] The maintenance device for the cooling system of the wind turbine generator provided in this disclosure and the wind turbine generator have at least the following beneficial effects: The maintenance device for the cooling system of the wind turbine generator provided in this disclosure is connected in parallel with the cooling pump of the cooling system through parallel pipelines, and can be turned on when needed, thereby meeting the online operation and maintenance of the cooling system of the wind turbine generator without the need for the cooling system to be shut down, thus reducing the operation and maintenance costs caused by the shutdown of the cooling system. Attached Figure Description

[0018] The above and / or other objects and advantages of this disclosure will become clearer from the following description of embodiments taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A structural diagram of a cooling system for a wind turbine generator provided as an exemplary embodiment of this disclosure.

[0020] Figure 2 for Figure 1 A simplified diagram of the structure of the cooling system after it is connected to the cooling system maintenance device.

[0021] Figure 3 for Figure 2 A simplified structural diagram of the heat dissipation module.

[0022] Figure 4 for Figure 2 A simplified structural diagram of the maintenance device.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Heating element; 11. Heating element inlet;

[0025] 12. Heat-generating component outlet; 2. Heat dissipation assembly;

[0026] 21. Heat dissipation component inlet; 22. Heat dissipation component outlet;

[0027] 23. Transformer substation radiator; 24. External cooling radiator;

[0028] 3. Cooling pump; 4. Three-way valve;

[0029] 41. Entrance; 42. First Exit;

[0030] 43. Second exit; 5. Detection unit;

[0031] 6. Reversing power assembly; 7. Filter assembly;

[0032] 71. First filtration unit; 72. Bypass piping;

[0033] 73. Second filtration unit; 8. Maintenance device;

[0034] 9. Material storage and adding unit; 10. Heat dissipation module;

[0035] 15. Filter; 16. Main pipeline. Detailed Implementation

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be construed that the embodiments of this disclosure are limited to those described herein. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0037] This disclosure provides a wind turbine generator set, typically including a tower, an impeller connected to the tower, and a generator. The impeller is connected to the generator's rotor via a main shaft, so that the rotation of the impeller drives the generator to generate electricity. Components in the wind turbine generator set, such as the generator, converter, gearbox, and transformer, generate a large amount of heat during operation. To ensure long-term reliable operation, the wind turbine generator set also includes a cooling system to dissipate heat from these heat-generating components. The component that generates heat during the operation of the wind turbine generator set is defined as heat-generating component 1.

[0038] Reference Figure 1 The cooling system of the wind turbine generator set may include the aforementioned heat-generating component 1, heat dissipation module 10, and cooling pump 3. The heat dissipation module 10 and the aforementioned heat-generating component 1 are connected through a main pipeline 16. The cooling pump 3 is installed on the main pipeline 16 and serves as a power source, providing power for the flow of coolant so as to drive the coolant to flow in the main pipeline 16, allowing the coolant to flow through the aforementioned heat-generating component 1 and heat dissipation module 10.

[0039] Driven by the cooling pump 3, the coolant will flow in the cooling system. When the coolant flows through the heat-generating component 1, it can absorb the heat generated by the heat-generating component 1 and then carry the heat to the heat dissipation module 10 and dissipate it outside the cooling system, thereby preventing the heat-generating component 1 from getting too hot.

[0040] As an example, the heat-generating component 1 may include at least one of a generator, a converter, a gearbox, and a transformer. When the heat-generating component 1 includes all four components—generator, converter, gearbox, and transformer—they can be connected in parallel on the main pipeline 16. That is, the outlets of the generator, converter, gearbox, and transformer are connected to form the heat-generating component outlet 12, and the inlets of the generator, converter, gearbox, and transformer are connected to form the heat-generating component inlet 11. When the coolant in the main pipeline 16 flows through the heat-generating component 1, it can carry away the heat generated by the heat-generating component 1, preventing the temperature of the heat-generating component 1 from becoming too high, thereby enabling the wind turbine generator set to operate normally.

[0041] Reference Figure 3 In this embodiment, the heat dissipation module 10 may include a heat dissipation component 2. Specifically, the heat dissipation component 2 may include an external cooling radiator 24 and a transformer substation radiator 23 connected in parallel. The external cooling radiator 24 is typically used to dissipate heat from components of a wind turbine generator, such as the generator, converter, or gearbox, that generate a large amount of heat. The transformer substation radiator 23 can be used to dissipate heat from a transformer substation, but is not limited thereto. With this configuration, the flow rates of the external cooling radiator 24 and the transformer substation radiator 23 can be adjusted independently. For example, flow regulating valves can be installed on their respective branches, allowing the external cooling radiator 24 and the transformer substation radiator 23 to independently adjust the flow rate of the coolant flowing through their respective branches according to their respective heat load requirements, thereby optimizing heat dissipation efficiency.

[0042] To enable more flexible temperature control of the cooling system, the heat dissipation module 10 may also include a three-way valve 4. The three-way valve 4 may have an inlet 41, a first outlet 42, and a second outlet 43. The inlet 41 of the three-way valve 4 is connected to the main pipeline 16, the first outlet 42 is connected to the heat dissipation component inlet 21 of the heat dissipation component 2, and the second outlet 43 is connected to the internal circulation pipeline. The outlet of the internal circulation pipeline and the heat dissipation component outlet 22 of the heat dissipation component 2 are respectively connected to the main pipeline 16. The flow rate between the first outlet 42 and the second outlet 43 can be controlled to control the flow rate of coolant flowing through the heat dissipation component 2 as needed, so as to flexibly control the temperature of the cooling system.

[0043] As an example, the three-way valve 4 has a valve body for regulating the flow rate of the first outlet 42 and the flow rate of the second outlet 43. The valve body is configured such that when the valve body is fully closed, the first outlet 42 is closed, and the coolant that enters the three-way valve 4 through the inlet 41 enters the internal circulation pipeline through the second outlet 43, and then enters the main pipeline 16.

[0044] When the valve body is fully open, the second outlet 43 is closed. At this time, the coolant that enters the three-way valve 4 through the inlet 41 enters the heat dissipation assembly 2 through the first outlet 42, and then enters the main pipeline 16. In this process, the coolant carries the heat from the heat-generating component 1 to the heat dissipation assembly 2 and dissipates it outside the cooling system through the heat dissipation assembly 2.

[0045] In this embodiment, by adjusting the opening of the three-way valve 4, the flow rate of coolant flowing out through the first outlet 42 and the flow rate of coolant flowing out through the second outlet 43 are adjusted, thereby achieving more flexible temperature control of the cooling system.

[0046] As an example, in low ambient temperatures, such as during cold seasons or in high-latitude / high-altitude regions, especially during the initial startup of the cooling system, to prevent excessive coolant loss, the first outlet 42 of the three-way valve 4 can be closed. All coolant entering the three-way valve 4 through the inlet 41 flows through the internal circulation pipe into the main pipeline 16, preventing the coolant from flowing through the heat dissipation component 2 and thus improving the operating efficiency of the cooling system in cold environments. As another example, during the initial startup of the cooling system, a heating device can also be activated to heat the coolant, improving its fluidity and preventing excessive viscosity due to low coolant temperature, which would hinder normal flow.

[0047] When the temperature of the coolant in the cooling system reaches the first predetermined temperature, the valve body gradually opens, and part of the coolant flows through the heat dissipation component 2 and part of the coolant flows through the internal circulation pipeline.

[0048] If the coolant temperature in the cooling system reaches the second predetermined temperature, which is greater than the first predetermined temperature, the valve body can be fully opened. All the coolant entering the three-way valve 4 through the inlet 41 flows through the heat dissipation component 2, so that the heat of the coolant can be dissipated in time, thereby improving the heat dissipation efficiency of the cooling system and preventing the heat-generating components 1 of the wind turbine generator from becoming too hot and unable to operate normally due to the inability to dissipate heat in time.

[0049] As mentioned above, by adjusting the opening of the three-way valve 4, the flow rate of coolant entering the heat dissipation component 2 can be adjusted, thereby flexibly controlling the temperature of the coolant as needed, which improves the operational reliability of the cooling system, but is not limited thereto.

[0050] Since the cooling system plays a crucial role in wind turbine generators, ensuring its reliable and stable operation is essential, typically requiring maintenance. This disclosure provides a maintenance device 8 for the cooling system of a wind turbine generator, which can be used for online maintenance of the cooling system, avoiding downtime during maintenance and thus reducing maintenance costs incurred due to downtime.

[0051] Reference Figure 2 and Figure 4 This disclosure provides a maintenance device 8 for a cooling system of a wind turbine generator set. The maintenance device 8 is connected in parallel to the cooling pump 3 of the cooling system via a parallel pipeline. The maintenance device 8 includes a filter assembly 7, a detection unit 5, and a control unit. The filter assembly 7 is disposed in the parallel pipeline and includes a first filter unit 71 and a bypass pipeline 72. The bypass pipeline 72 is configured to be connected in parallel with the first filter unit 71, and one of the bypass pipeline 72 and the first filter unit 71 is connected.

[0052] Specifically, when the first filter unit 71 is activated, it performs a filtration operation, at which point the bypass line 72 is closed. When the first filter unit 71 is deactivated, the bypass line 72 is activated to keep the filter assembly 7 connected, thereby keeping the entire maintenance device 8 connected. A detection unit 5 is located on the parallel line and configured to detect whether the first filter unit 71 is blocked. The control unit is configured to receive the detection result from the detection unit 5 and control the activation and deactivation of the first filter unit 71, as well as the closure and activation of the bypass line 72.

[0053] The maintenance device for the cooling system of the wind turbine generator provided in this disclosure can perform inspection and maintenance of the cooling system during operation, thereby realizing online operation and maintenance of the cooling system and reducing the operation and maintenance costs caused by the downtime of the cooling system.

[0054] The maintenance device for the cooling system provided in this disclosure can be connected to the cooling system for a long period of time, or for periodic maintenance, or when the cooling system malfunctions, but is not limited thereto.

[0055] Normally, the filter assembly 7 is equipped with a filter screen to intercept particles larger than a specified diameter. Therefore, the filter assembly 7 is the most prone to clogging in the entire maintenance device 8. In this embodiment, the first filter unit 71 is equipped with a filter screen, enabling it to intercept particles in the filtrate. The detection data from the detection unit 5 can be used to determine whether the first filter unit 71 is clogged.

[0056] As an example, the pore size of the filter screen of the first filter unit 71 of the maintenance device 8 can be smaller than the pore size of the filter screen of the original filter 15 in the cooling system, so as to filter out smaller particles and achieve the purification treatment of coolant, but it is not limited thereto.

[0057] In this embodiment, since the pore size of the filter screen of the first filter unit 71 is smaller than that of the filter screen of the original filter 15 in the cooling system, the first filter unit 71 is more prone to clogging than the filter 15 in the cooling system. When the detection unit 5 detects that the parallel pipeline is blocked, it can be determined that the first filter unit 71 is blocked.

[0058] In this embodiment, the filter assembly 7 may include a first filter unit 71 and a bypass pipe 72 arranged in parallel. Under normal circumstances, the first filter unit 71 is in the enabled state, and the coolant can be purified through the first filter unit 71, and the particulate matter in the coolant will be filtered out by the first filter unit 71.

[0059] As an example, the detection unit 5 can be used to detect whether the first filter unit 71 is blocked. When the first filter unit 71 is blocked, the control unit can control the bypass pipe 72 to be connected to ensure that the entire maintenance device 8 can operate normally, thereby keeping the cooling system running, and the wind turbine generator set can operate normally.

[0060] Under normal circumstances, if a component in the cooling system becomes blocked, it will cause the hydraulic pressure of the main cooling line 16 to suddenly increase or the flow rate of the main cooling line 16 to suddenly decrease. In this embodiment, the detection unit 5 may include at least one of a pressure sensor and a flow detection device to detect whether the main cooling line 16 is blocked.

[0061] According to existing technology, in this embodiment, the differential pressure method can be used to detect whether the main pipeline 16 is blocked. For example, but not limited to, pressure sensors can be set on the inlet side and outlet side of the first filter unit 71 respectively. When the pressure difference between the two pressure sensors is greater than a predetermined value, it can be determined that the first filter unit 71 is blocked, but this is not the limitation.

[0062] Specifically, under normal circumstances, the detection unit 5 may include a pressure sensor, which is used to detect the pressure difference between the inlet side pressure and the outlet side pressure of the first filter unit 71. When the pressure difference is greater than a predetermined value, it can be determined that the first filter unit 71 is blocked.

[0063] As an example, pressure sensors can be installed on the inlet and outlet sides of the first filter unit 71 respectively. When the pressure difference between the pressure sensor on the inlet side and the pressure sensor on the outlet side suddenly increases, it can be determined that the first filter unit 71 is blocked.

[0064] In addition, when the first filter unit 71 is clogged, the flow rate of the main pipeline 16 will decrease sharply. Therefore, as needed, the detection unit 5 may also include a flow detection device. When the flow rate of the main pipeline 16 detected by the flow detection device is less than a predetermined value, it can be determined that the first filter unit 71 is clogged. As an example, in this embodiment, the flow detection device may be either a flow meter or a flow sensor, but it is not limited thereto.

[0065] In this embodiment, the first filter unit 71 can be determined to be clogged by the pressure difference method or flow change method of existing technologies, which will not be elaborated here.

[0066] In this embodiment, when the maintenance device 8 is connected to the cooling system, the first filter unit 71 can be turned on. At this time, the coolant can flow through the first filter unit 71 for filtration. Since the pore size of the filter screen of the first filter unit 71 is smaller than that of the filter screen of the original filter 15 in the cooling system, the first filter unit 71 can filter out particles with smaller particle sizes. When there are particles in the cooling system, the particles are more easily intercepted by the first filter unit 71. Furthermore, since the first filter unit 71 and the bypass pipe 72 are connected in parallel, when the first filter unit 71 is blocked, the bypass pipe 72 can be turned on, thereby avoiding maintenance device failure and ensuring the normal operation of the cooling system.

[0067] Furthermore, the bypass line 72 can normally be in the off state. When the first filter unit 71 is blocked, the control unit controls the bypass line 72 to be opened, ensuring that the coolant can circulate and dissipate heat from the heat-generating component 1. When the bypass line 72 is open, the coolant can bypass the first filter unit 71. At this time, the operator can treat the first filter unit 71 to remove blockages. For example, but not limited to, the first filter unit 71 can be pre-set with a drain port, which can be opened to discharge particulate matter.

[0068] As an example, with the bypass pipe 72 connected, blockages in the first filter unit 71 can be addressed, for example, but not limited to, by using a scraper to assist in removing the blockages from the drain port of the first filter unit 71. Alternatively, the filter element of the first filter unit 71 can be replaced directly, or the first filter unit 71 can be replaced entirely, all within the scope of this disclosure.

[0069] During the inspection and maintenance of the cooling system, when the detection data from the detection unit 5 indicates that the first filter unit 71 is clogged, the flow direction of the coolant can be alternately changed. On the one hand, this temporarily clears the first filter unit 71, preventing excessive pressure in the pipeline. On the other hand, by alternately changing the flow direction of the coolant, the particles deposited in the cooling system can be moved along with the coolant and thus removed.

[0070] In this embodiment, the maintenance device may further include a reversing power component 6, which is disposed in the parallel pipeline, and the reversing power component 6 and the filter component 7 can be connected in series. The reversing power component 6 can be used to control the flow direction of the medium in the parallel pipeline.

[0071] As an example, the reversing power assembly 6 can be used to periodically change the flow direction of the medium. By changing the direction multiple times, the deposited particles can be made to flow and be filtered by the first filter unit 71.

[0072] The normal flow direction of coolant in a cooling system can be defined as forward flow. Coolant flowing in the opposite direction to forward flow in a cooling system can be defined as reverse flow.

[0073] As an example, the reversing power assembly 6 can be configured to control the coolant to flow forward for a first predetermined time and flow backward for a second predetermined time, repeating this process. This can move the particles deposited in the main pipeline 16 and allow them to flow with the coolant to the first filter unit 71, where they can be filtered out.

[0074] In this embodiment, the reversing power assembly 6 can be used as a power source to change the flow direction of the coolant, but is not limited thereto.

[0075] In this embodiment, the maintenance device 8 includes a reversing power assembly 6, and the maintenance device 8 is connected in parallel with the cooling pump 3 through a parallel pipeline. As needed, at least one of the reversing power assembly 6 and the cooling pump 3 can be used as a power source to provide power for the circulation of coolant.

[0076] As an example, even when the commutation power assembly 6 is not activated, the coolant can still pass through the commutation power assembly 6 without obstructing the flow of coolant.

[0077] When the maintenance device 8 is connected to the main pipeline 16 via a parallel pipeline, with the cooling pump 3 used as a power source, a portion of the coolant flows through the heat dissipation component 2 for normal heat dissipation, while the other portion can flow through the maintenance device 8 for detection and treatment, providing the possibility of cleaning the coolant during the operation of the cooling system.

[0078] When the maintenance device 8 is connected to the main pipeline 16 via a parallel pipeline, and the reversing power assembly 6 is used as the power source, and the reversing power assembly 6 drives the coolant to flow in the forward direction, some coolant can pass through the cooling pump 3. That is, in this case, the coolant can flow in both the parallel pipeline where the maintenance device 8 is located and the main pipeline 16 where the cooling pump 3 is located. When the reversing power assembly 6 drives the coolant to flow in the reverse direction, the coolant cannot pass through the cooling pump 3.

[0079] The maintenance device 8 provided in this disclosure can be connected to the cooling system when the cooling system fails, or during regular maintenance, and is within the protection scope of this disclosure.

[0080] In this embodiment, the maintenance device 8 and the cooling pump 3 are connected in parallel via parallel piping as an example. Since the maintenance device 8 includes a reversing power assembly 6, which can be used as a power source for coolant flow, the maintenance device 8 can be connected in parallel with any component in the cooling system via parallel piping. This ensures that in the event of a component failure, the maintenance device can maintain coolant flow in the cooling system, thereby preventing system shutdown and enabling online replacement of the component.

[0081] As an example, the maintenance device 8 can be connected in parallel with the filter 15 in the cooling system via a parallel pipeline. When the filter 15 fails, the maintenance device 8, connected in parallel with the filter 15, allows the coolant to bypass the filter 15 and return to the main pipeline 16 after passing through the maintenance device 8, thus maintaining coolant circulation. In this case, since the coolant can bypass the filter 15, the filter 15 in the cooling system can be replaced, enabling online replacement of faulty components in the cooling system and avoiding maintenance costs caused by cooling system downtime.

[0082] To facilitate the connection of maintenance device 8, valves can be installed at the inlet and coolant port of each component in the cooling system. These valves can be manual or electric, but are not limited to these.

[0083] As an example, the reversing power assembly 6 may include a bidirectional pump. The control unit can control the operating direction of the bidirectional pump, and by changing the operating direction of the bidirectional pump, the flow direction of the coolant can be adjusted. Specifically, when the first filter unit 71 is clogged, the control unit can receive information about the clog in the first filter unit 71 and be configured to control the operating direction of the bidirectional pump. By reversing the flow of coolant, the blockage in the first filter unit 71 can be temporarily removed from the filter screen of the first filter unit 71, thereby temporarily clearing the first filter unit 71. By periodically changing the flow direction of the coolant, particles deposited in the cooling system can be carried along with the coolant and flow to the first filter unit 71, where they are filtered out.

[0084] This embodiment uses the blockage of the first filter unit 71 as an example for illustration. The control unit can receive the blockage signal and control the working direction of the bidirectional pump, but it is not limited to this. In this embodiment, any blockage in any component of the maintenance device 8 or any component of the cooling system will be detected by the detection unit 5, and the blockage signal will be transmitted to the control unit. The control unit will then control the working direction of the bidirectional pump according to the blockage signal.

[0085] In an optional embodiment, the reversing power assembly 6 may further include a pump body and a four-way ball valve, which are connected in series and disposed on a parallel pipeline. The control unit can control the four-way ball valve to change the flow direction of the medium in the parallel pipeline, i.e., the flow direction of the coolant. In this embodiment, the pump body serves as the power source for the coolant flow, and the change in the coolant flow direction is achieved by adjusting the four-way ball valve, so that deposited particles can be carried along with the coolant.

[0086] In this embodiment, the flow direction of the coolant can be periodically alternating under the driving action of the commutation power component 6, so that the deposited particles can flow together with the coolant and then flow to the first filter unit 71 to be filtered out.

[0087] In this embodiment, the flow direction of coolant can be changed by using a four-way ball valve and a pump body. Compared with a bidirectional pump, this four-way ball valve and pump body combination scheme has a simple structure and low cost, thereby reducing the manufacturing cost of the maintenance device.

[0088] Furthermore, in order to accelerate the flow of coolant and improve the speed of inspection and maintenance of the cooling system, in this embodiment, the maintenance device 8 also includes a heating device (not shown). The heating device can be installed in the parallel pipeline. When the first filter unit 71 is blocked, the control unit is configured to control the heating device to heat the medium (i.e., coolant) flowing through the parallel pipeline.

[0089] This embodiment reduces the viscosity of the coolant by heating it, thereby improving its fluidity and thus increasing the flushing efficiency of the cooling system.

[0090] As an example, the heating device provided in this embodiment can be an additional heating device. In order to reduce costs, this embodiment uses the original heating device of the wind turbine generator to heat the cooling system, but it is not limited to this.

[0091] As an example, the heating device may be a PTC (Positive Temperature Coefficient) ceramic heater, but is not limited thereto; any component capable of heating the cooling system is within the scope of this disclosure.

[0092] As an example, the heating device is configured to control its heating temperature between 50°C and 60°C, taking into account multiple aspects such as heat transfer efficiency, equipment protection, and chemical stability.

[0093] During long-term use of the cooling system, over time, friction between the coolant and the pipes may cause mechanical debris to enter the coolant, resulting in particulate matter in the coolant. For example, but not limited to, the particulate matter may be in the form of lumps.

[0094] As an example, if the detection unit 5 detects that the first filter unit 71 is blocked, the bypass pipe 72 can be connected to keep the maintenance device 8 open, thus avoiding excessive pressure on the entire maintenance device 8 and improving the reliability of the maintenance device.

[0095] To accelerate the flow of particulate matter in the coolant and improve the removal speed, this embodiment can reduce the viscosity of the coolant by heating it, thereby improving its fluidity. Furthermore, the maintenance device 8 includes a reversing power assembly 6, which can drive the coolant to change its flow direction, allowing deposited particulate matter to flow with the coolant to the filter assembly and be filtered out, thus improving the particulate matter filtration efficiency.

[0096] This embodiment uses a liquid-cooled cooling system as an example. As an example, the coolant in this system can be ethylene glycol or propylene glycol, but is not limited to these. The type of coolant can be selected from existing technologies, and will not be elaborated further. This embodiment uses ethylene glycol as the coolant as an example.

[0097] During the long-term operation of wind turbine generators, ethylene glycol may decompose under high temperature and oxygen conditions, producing acidic substances such as formic acid and acetic acid. These acidic substances corrode metal components, leading to the formation of metal oxides. Since the pipes or heat dissipation components used in cooling systems are usually made of metal, such as, but not limited to, metals like steel, copper, and aluminum, electrochemical corrosion will occur in the acidic environment formed by these substances. The anolyte metal loses electrons and becomes ions, which react with hydrogen ions or oxygen in the solution to form metal oxides or hydroxides, resulting in an increase in particulate matter in the coolant. For example, iron may form FeO under acidic conditions. or FeO Copper may form Cu under acidic conditions, and aluminum may form AlO under acidic conditions. .

[0098] In addition, during the operation of the cooling system, microorganisms such as bacteria may grow in the coolant. Their metabolism may produce acidic substances or sulfides, which can aggravate metal corrosion in the cooling system and indirectly lead to the formation of metal oxides.

[0099] Metal oxides formed during long-term use of coolant are particulate matter that can cause blockage of the first filter unit 71. Through the combined treatment of the filter assembly 7, heating device and reversing power assembly 6, the particulate matter in the coolant can be removed.

[0100] As metal oxides form in the coolant, the ion concentration in the coolant increases, which will affect the normal operation of the coolant. In addition, during long-term operation, the solubility of metal ions in the coolant can increase due to various reasons.

[0101] In this embodiment, after the coolant has undergone preliminary filtration by the filter assembly 7, further filtration is required to remove impurities such as metal ions from the coolant.

[0102] Specifically, the filter assembly 7 may also include a second filter unit 73, which may be connected in parallel with the first filter unit 71, and one of the bypass pipe 72, the first filter unit 71 and the second filter unit 73 may be connected to the second filter unit 73, so as to adopt different filtration methods for the coolant according to different needs. When the coolant flows through the second filter unit 73, the coolant can be precisely filtered to remove metal ions and other substances in the coolant.

[0103] Specifically, the filter assembly 7 is configured such that when the second filter unit 73 is enabled, the first filter unit 71 is disabled and the bypass line 72 is turned off; when the first filter unit 71 is enabled, the second filter unit 73 is disabled and the bypass line 72 is turned off; when the first filter unit 71 and the second filter unit 73 are disabled, the bypass line 72 is turned on.

[0104] Specifically, in this embodiment, the second filtration unit 73 includes an activated carbon adsorption filtration structure, an electrodialysis filtration structure, and a reverse osmosis filtration structure connected in series.

[0105] As an example, the detection unit 5 may include a conductivity sensor configured to detect the conductivity of the coolant. When the detection data from the detection unit 5 indicates that the first filter unit 71 is in a non-clogging state, and the conductivity value of the coolant detected by the conductivity sensor is greater than a predetermined value, the control unit is configured to control the second filter unit 73 to conduct, thereby reducing the conductivity of the coolant. In this embodiment, the predetermined value of conductivity can be determined according to existing technology, and will not be elaborated further here.

[0106] In an optional embodiment, the detection unit 5 may further include a turbidity sensor configured to detect the concentration of suspended particles in the coolant. When the turbidity parameter of the coolant detected by the turbidity sensor is greater than a predetermined value, the control unit controls the second filtration unit 73 to be turned on to reduce the turbidity of the coolant. In this embodiment, the predetermined value of turbidity can be determined according to existing technology, and will not be elaborated further here.

[0107] Thus, after the coolant is processed by the second filtration unit 73, the concentration of metal ions or suspended particles in the coolant is reduced.

[0108] Furthermore, the detection unit 5 also includes a pH sensor configured to detect the pH value of the coolant. The maintenance device may also include a material storage and addition unit 9 connected to a parallel pipeline. The material storage and addition unit 9 is configured to store corrosion inhibitors. When the pH value detected by the pH sensor is less than a predetermined value, the control unit is configured to control the material storage and addition unit 9 to add corrosion inhibitors to the coolant. The corrosion inhibitors include one of aliphatic dicarboxylic acid, undecanoic acid, 2-ethylhexanoic acid, 5-methylbenzotriazole, sodium benzoate, triethanolamine, sodium molybdate, and benzotriazole.

[0109] Typically, the pH value of the coolant in wind turbine generators is controlled between 7.5 and 9.0. This protects the metal materials of the cooling system while preventing excessive alkalinity that could lead to salt precipitation. Specifically, corrosion inhibitors are added to the coolant to neutralize acidic substances generated during use, thus maintaining the coolant within the aforementioned pH range.

[0110] If necessary, the material storage and addition unit 9 can also pre-store coolant. When the liquid level in the cooling system is lower than a predetermined value, the material storage and addition unit 9 can add coolant to the cooling system to restore the liquid level to the predetermined value.

[0111] Specifically, the detection unit 5 may also include a liquid level sensor configured to detect the liquid level height of the coolant. When the liquid level height detected by the liquid level sensor is less than a predetermined value, the control unit is configured to control the material storage and addition unit 9 to add coolant to the maintenance device.

[0112] As an example, the material storage and adding unit 9 may include multiple independent receiving cavities, each connected to an outlet, so that materials flowing out of the multiple receiving cavities can enter the main pipeline 16. In this embodiment, different materials are stored in different receiving cavities, but this is not a limitation.

[0113] To ensure the normal operation of wind turbine generators, the cooling system typically requires inspection and maintenance, such as coolant testing, coolant impurity removal, and replacement or repair of cooling equipment. This disclosure provides a cooling system maintenance device that can be integrated into the cooling system, allowing for online maintenance without system downtime, thus reducing maintenance costs associated with downtime.

[0114] In another aspect of this disclosure, a wind turbine generator set is provided, the wind turbine generator set including a cooling system and the maintenance device as described above, the maintenance device and the cooling pump being connected in parallel.

[0115] In the description of this disclosure, it should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to 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 disclosure.

[0116] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0117] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0118] The features, structures, or characteristics described in this disclosure can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the foregoing description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

Claims

1. A maintenance device for the cooling system of a wind turbine generator set, characterized in that, The maintenance device is connected in parallel to the cooling pump (3) of the cooling system via a parallel pipeline. The maintenance device includes: A filter assembly (7) is disposed in the parallel pipeline. The filter assembly (7) includes a first filter unit (71) and a bypass pipeline (72) connected in parallel. When the first filter unit (71) is activated, the bypass pipeline (72) is turned off. When the first filter unit (71) is deactivated, the bypass pipeline (72) is turned on. The detection unit (5) is disposed on the parallel pipeline and is configured to detect whether the first filter unit (71) is blocked; The control unit is configured to receive the detection result of the detection unit (5) and control the activation and deactivation of the first filter unit (71) and the connection and disconnection of the bypass pipeline (72).

2. The maintenance device according to claim 1, characterized in that, The maintenance device also includes: A reversing power assembly (6) is disposed in the parallel pipeline and connected in series with the filter assembly (7). The reversing power assembly (6) is used to control the flow direction of the medium in the parallel pipeline.

3. The maintenance device according to claim 2, characterized in that, The commutation power assembly (6) includes a bidirectional pump, and the control unit is further configured to control the operating direction of the bidirectional pump; or, The reversing power assembly (6) includes a pump body and a four-way ball valve connected in series, and the control unit is also configured to control the four-way ball valve to change the flow direction of the medium in the parallel pipeline.

4. The maintenance device according to any one of claims 1-3, characterized in that, The detection unit (5) includes at least one of a pressure sensor and a flow detection device.

5. The maintenance device according to any one of claims 1-3, characterized in that, The maintenance device further includes a heating device disposed in the parallel pipeline, and the control unit is further configured to control the heating device to heat the medium flowing through the parallel pipeline.

6. The maintenance device according to any one of claims 1-3, characterized in that, The filtration assembly further includes a second filtration unit (73), which includes an activated carbon adsorption filtration structure, an electrodialysis filtration structure, and a reverse osmosis filtration structure connected in series. The second filtration unit (73) is connected in parallel with the first filtration unit (71). When the second filtration unit (73) is activated, the first filtration unit (71) is deactivated and the bypass pipe (72) is turned off. When the first filtration unit (71) is activated, the second filtration unit (73) is deactivated and the bypass pipe (72) is turned off. When the first filtration unit (71) and the second filtration unit (73) are deactivated, the bypass pipe (72) is turned on.

7. The maintenance device according to claim 4, characterized in that, The detection unit (5) further includes a conductivity sensor configured to detect the conductivity of the coolant; and / or, The detection unit (5) further includes a turbidity sensor configured to detect the concentration of suspended particles in the coolant; and / or, The detection unit (5) further includes a liquid level sensor configured to detect the liquid level height of the coolant; and / or, The detection unit (5) also includes a pH sensor configured to detect the pH value of the coolant.

8. The maintenance device according to claim 7, characterized in that, The maintenance device also includes a material storage and addition unit (9) connected to the parallel pipeline and configured to store corrosion inhibitors. The control unit is also configured to control the material storage and addition unit (9) to add corrosion inhibitors to the parallel pipeline.

9. A wind turbine generator set, characterized in that, The wind turbine generator set includes: Cooling system; and The maintenance device as described in any one of claims 1-8.

10. The wind turbine generator set according to claim 9, characterized in that, The cooling system includes a filter (15), wherein the pore size of the filter screen of the first filter unit (71) is smaller than the pore size of the filter screen of the filter (15).

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