Oil return device and wind generating set

Abstract

The utility model relates to the technical field of wind turbine generator gearbox maintenance, in particular to an oil return device and a wind turbine generator. The oil return device comprises an oil tank provided with a containing cavity used for containing oil; the driving structure comprises a valve block, a first driving piece and a second driving piece, and the valve block comprises a valve element and a first connector assembly, a second connector assembly, a third connector assembly and a fourth connector assembly which are arranged on the valve element. Wherein the first connector assembly communicates with part of the third connector assembly and part of the fourth connector assembly to form a first connecting passage, the first driving part is used for pumping oil liquid of an oil leakage opening of the gearbox into the containing cavity through the first connecting passage, and the second connector assembly communicates with part of the third connector assembly and part of the fourth connector assembly to form a second connecting passage. And the first connecting channel and the second connecting channel are independently arranged, and the second driving part is used for injecting oil in the containing cavity into the gearbox through the second connecting channel.

Description

Technical Field

[0001] This application relates to the field of wind turbine gearbox maintenance technology, and in particular to an oil return device and a wind turbine generator set. Background Technology

[0002] The gearbox of a wind turbine is the core transmission component connecting the wind turbine and the generator. It uses a multi-stage gear structure to convert the low-speed mechanical energy captured by the wind turbine into the high-speed energy required by the generator, thereby improving the energy conversion efficiency.

[0003] Long-term operation of wind turbine gearboxes can lead to localized oil leaks, resulting in oil loss, environmental pollution, and increased gear wear and bearing failure risks. Current technologies require shutting down the generator and removing it to maintain and repair the gearbox, incurring high costs in tooling and labor. Utility Model Content

[0004] This application provides an oil return device and a wind turbine generator set, which can recover and reinject oil leaking from the gearbox, reducing the frequency of gearbox maintenance and repair and operation and maintenance costs.

[0005] To achieve the above objectives, the technical solution of this application is as follows:

[0006] In a first aspect, this application provides an oil return device, comprising: an oil tank having a receiving cavity for containing oil; a drive structure disposed in the oil tank, the drive structure including a valve block, a first drive member, and a second drive member, the valve block including a valve core and a first interface assembly, a second interface assembly, a third interface assembly, and a fourth interface assembly disposed on the valve core, the first interface assembly being connected to the first drive member, the second interface assembly being connected to the second drive member, the third interface assembly communicating with the receiving cavity, and the fourth interface assembly being used to communicate with a gearbox; wherein, the first interface assembly is connected to a portion of the third interface assembly and a portion of the fourth interface assembly to form a first connection passage, the first drive member is used to draw oil from the oil leak of the gearbox into the receiving cavity through the first connection passage, the second interface assembly is connected to a portion of the third interface assembly and a portion of the fourth interface assembly to form a second connection passage, the first connection passage and the second connection passage are independently disposed of each other, and the second drive member is used to inject oil from the receiving cavity into the gearbox through the second connection passage.

[0007] In one possible implementation, the oil return device provided in this application has a valve core with a polyhedral structure, the valve core including multiple sidewalls, and at least two of the first interface component, the second interface component, the third interface component and the fourth interface component are located on different sidewalls.

[0008] In one possible implementation, the oil return device provided in this application includes an oil outlet and an oil inlet in each of the first interface component, the second interface component, the third interface component, and the fourth interface component; the oil inlet of the fourth interface component, the oil inlet of the first interface component, the first driving member, the oil outlet of the first interface component, and the oil outlet of the third interface component are sequentially connected; the oil inlet of the third interface component, the oil inlet of the second interface component, the second driving member, the oil outlet of the second interface component, and the oil outlet of the fourth interface component are sequentially connected.

[0009] In one possible implementation, the oil return device provided in this application further includes a control component, which includes a timing element, a level detection element, and a control element. The timing element and the level detection element are both communicatively connected to the control element. The level detection element is used to monitor the oil level in the receiving cavity, and the control element is communicatively connected to the drive structure. And / or, the control component further includes a power supply element, which is used to supply power to the drive structure and the control component.

[0010] In one possible implementation, the oil return device provided in this application further includes a heating element disposed in the receiving cavity, which is used to regulate the oil temperature in the receiving cavity; the control component further includes a temperature detection element, which is communicatively connected to the control component and is used to monitor the oil temperature.

[0011] In one possible implementation, the oil return device provided in this application further includes a filter element disposed in an oil tank; the valve block further includes a fifth interface assembly disposed on the valve core, the fifth interface assembly being located in the second connection passage and connected to the filter element, the filter element being used to filter the oil in the second connection passage.

[0012] In one possible implementation, the oil return device provided in this application further includes a pressure testing port, a pressure detection element, and an overflow valve on the valve block. The pressure detection element is used to monitor the oil injection pressure. And / or, the valve block is further included with a switching element and an oil drain valve. The switching element is used to control the connection and disconnection between the receiving cavity and the second driving element, and the oil drain valve is used to discharge the oil in the valve block.

[0013] In one possible implementation, the oil return device provided in this application further includes a one-way valve, which is disposed between the first drive member and the receiving cavity to prevent oil backflow; and / or, it further includes an air filter, which is disposed in the oil tank and communicates with the receiving cavity, and the air filter is used to discharge gas in the receiving cavity and prevent external gas from entering the receiving cavity.

[0014] In one possible implementation, the oil return device provided in this application includes a first driving component comprising a first motor and a first pump body driven by the first motor; and a second driving component comprising a second motor and a second pump body driven by the second motor; wherein the first pump body comprises a peristaltic pump and the second pump body comprises a gear pump.

[0015] In one possible implementation, the oil return device provided in this application has an oil tank with an oil drain port and an oil inlet port that communicate with the receiving cavity. The oil inlet port is provided with a removable first sealing element, and the oil drain port is provided with a removable second sealing element. The oil drain port is used to discharge the oil in the receiving cavity.

[0016] In one possible implementation, the oil return device provided in this application further includes a fixed bracket, which is disposed in the oil tank and fixedly connected to the second driving member, and the fixed bracket is used to fix the second driving member.

[0017] Secondly, this application provides a wind turbine generator set, including a generator, a gearbox, and the aforementioned oil return device. The fourth interface component of the oil return device is connected to the gearbox and is disposed at the connection between the gearbox and the generator.

[0018] The oil return device and wind turbine generator set provided in this application include an oil tank and a drive structure. The oil tank has a receiving cavity for containing oil. The drive structure is disposed in the oil tank and includes a valve block, a first drive component, and a second drive component. The valve block includes a valve core and a first interface assembly, a second interface assembly, a third interface assembly, and a fourth interface assembly disposed on the valve core. The first drive component and the second drive component are integrated into the valve block through the first interface assembly and the second interface assembly, respectively, thereby reducing external piping and assembly nodes, making the oil return device structure more compact and reducing the complexity of the oil return device. The first interface assembly communicates with a portion of the third interface assembly and a portion of the fourth interface assembly to form a first connection passage. The first drive component is used to draw oil from the oil leak of the gearbox into the receiving cavity through the first connection passage. The second interface assembly communicates with a portion of the third interface assembly and a portion of the fourth interface assembly to form a second connection passage. The first connection passage and the second connection passage are independently disposed. The second drive component is used to inject oil from the receiving cavity into the gearbox through the second connection passage. By establishing independent first and second connection channels, the oil leaking from the gearbox can be recovered and reinjected. Therefore, the oil return device of this application can reduce the frequency of gearbox maintenance and repair, thus lowering operating costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 Schematic diagram of the structure of the oil return device provided in the embodiments of this application Figure 1 ;

[0021] Figure 2 Schematic diagram of the structure of the oil return device provided in the embodiments of this application Figure 2 ;

[0022] Figure 3 Schematic diagram of the structure of the oil return device provided in the embodiments of this application Figure 3 ;

[0023] Figure 4 Schematic diagram of the structure of the oil return device provided in the embodiments of this application Figure 4 ;

[0024] Figure 5 Schematic diagram of the structure of the oil return device provided in the embodiments of this application Figure 5 ;

[0025] Figure 6 A schematic diagram of the valve block provided in the embodiments of this application. Figure 1 ;

[0026] Figure 7 A schematic diagram of the valve block provided in the embodiments of this application. Figure 2 ;

[0027] Figure 8 A schematic diagram of the valve core provided in the embodiments of this application. Figure 1 ;

[0028] Figure 9 A schematic diagram of the valve core provided in the embodiments of this application. Figure 2 ;

[0029] Figure 10 This is a schematic diagram illustrating the working principle of the oil return device provided in the embodiments of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10-Fuel tank; 11-Drain port; 12-Fuel inlet; 13-First connection port; 14-Second connection port;

[0032] 20-Drive structure;

[0033] 100-Valve block; 110-Valve core; 111-Side wall; 112-Connecting hole; 121-First interface assembly; 121a-First oil outlet; 121b-First oil inlet; 122-Second interface assembly; 122a-Second oil outlet; 122b-Second oil inlet; 123-Third interface assembly; 123a-Third oil outlet; 123b-Third oil inlet; 124-Fourth interface assembly; 124a-Fourth oil outlet; 124b-Fourth oil inlet; 125-Fifth interface assembly; 125a-Fifth oil outlet; 125b-Fifth oil inlet; 130-Pressure test port; 140-Pressure detection element; 150-Relief valve; 160-Switch element; 170-Drain valve;

[0034] 200 - First drive component; 300 - Second drive component;

[0035] 30-Control component; 31-Level detection component; 32-Power supply component; 33-Temperature detection component;

[0036] 40-Heating element; 50-Filter element; 51-Differential pressure switch; 60-One-way valve; 70-Air filter; 80-Fixed bracket.

[0037] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the preferred embodiments of this application will be described in more detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0039] It should be noted that in the description of the embodiments of this application, the terms "upper", "lower", "inner", "outer" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0040] Furthermore, it should be noted that 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] Long-term operation of wind turbine gearboxes can lead to localized oil leaks, resulting in oil loss, environmental pollution, and increased gear wear and bearing failure risks. Current technologies require shutting down the generator and removing it to maintain and repair the gearbox, incurring high costs in tooling and labor.

[0043] In view of this, the oil return device of this application, by setting up independent first and second connection passages, can realize the recovery and reinjection of oil leaking from the gearbox. Therefore, the oil return device of this application can reduce the frequency of gearbox maintenance and repair, thereby reducing operation and maintenance costs.

[0044] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0045] See Figure 1 and combined Figure 6 , Figure 7As shown, this application provides an oil return device, which may include an oil tank 10 and a drive structure 20. The oil tank 10 has a receiving cavity for containing oil. The drive structure 20 may be disposed on the oil tank 10, and the drive structure 20 may include a valve block 100, a first drive member 200, and a second drive member 300. The valve block 100 includes a valve core 110 and a first interface assembly 121, a second interface assembly 122, a third interface assembly 123, and a fourth interface assembly 124 disposed on the valve core 110. The first interface assembly 121 is connected to the first drive member 200, the second interface assembly 122 is connected to the second drive member 300, the third interface assembly 123 communicates with the receiving cavity, and the fourth interface assembly 124 is used to communicate with a gearbox. The first interface component 121 is connected to a portion of the third interface component 123 and a portion of the fourth interface component 124 to form a first connection passage. The first drive component 200 is used to draw oil from the oil drain port of the gearbox into the receiving cavity through the first connection passage. The second interface component 122 is connected to a portion of the third interface component 123 and a portion of the fourth interface component 124 to form a second connection passage. The first connection passage and the second connection passage are independently set. The second drive component 300 is used to inject oil from the receiving cavity into the gearbox through the second connection passage.

[0046] It should be noted that the oil return device may include an oil tank 10 and a drive structure 20. The coordinated operation of the oil tank 10 and the drive structure 20 enables bidirectional flow control of the oil between the gearbox and the oil return device. The oil tank 10, as a load-bearing structure, has a receiving cavity for containing the oil. The cavity structure may include shapes such as cylinders or cuboids. The inner wall 111 of the oil tank 10 may be sealed to prevent oil leakage. The volume of the receiving cavity can be set according to the oil volume requirements of the gearbox and the working cycle of the oil return device to ensure that it can accommodate leaked oil generated during normal operation of the gearbox.

[0047] A drive structure 20 is disposed on the oil tank 10 to enable bidirectional transmission of oil between the gearbox and the oil tank 10. The drive structure 20 may include a valve block 100, a first drive component 200, and a second drive component 300. The valve block 100 serves as the hub for oil circuit control and may include a valve core 110 and a first interface assembly 121, a second interface assembly 122, a third interface assembly 123, and a fourth interface assembly 124 disposed on the valve core 110. Each interface assembly may be connected to the valve core 110 via threaded connection, flange connection, or quick-connect fitting, etc., and this embodiment is not limited thereto.

[0048] In a specific implementation, the first interface component 121 can be connected to the first driving component 200. The first driving component 200 may include a power device such as an electric pump or a hydraulic pump to provide power for pumping oil. The valve core 110 may have multiple independently configured flow channels inside. The first interface component 121 is connected to the inside of the valve core 110, and the first interface component 121 communicates with part of the third interface component 123 and part of the fourth interface component 124 through the flow channels inside the valve core 110, thereby forming a first connection path.

[0049] For example, the first interface component 121, the third interface component 123, and the fourth interface component 124 may each include multiple independently configured interfaces. The interface of the first interface component 121 may be connected to one of the flow channels inside the valve core 110, and through this flow channel, it may be connected to one of the interfaces of the third interface component 123 and one of the interfaces of the fourth interface component 124, thereby forming a first connection path.

[0050] The third interface component 123 is connected to the receiving cavity of the oil tank 10, while the fourth interface component 124 is used to connect to the gearbox, specifically to the oil leak port of the gearbox, so as to collect the oil leaked during the operation of the gearbox. In the first connection passage, after the first drive component 200 is started, the resulting suction effect causes the oil from the gearbox oil leak port to pass sequentially through the fourth interface component 124, the internal flow channel of the valve core 110, and the first interface component 121 into the first drive component 200. Then, the first drive component 200 transports the oil to the third interface component 123 through the internal flow channel of the valve core 110, and finally injects it into the receiving cavity of the oil tank 10, so as to realize the recovery of the oil leaked from the gearbox into the oil tank 10.

[0051] The second interface component 122 is connected to the second drive component 300, which may include a power device such as an electric pump or a hydraulic pump, for injecting oil from the oil tank 10 into the gearbox. The second interface component 122 communicates with a portion of the third interface component 123 and a portion of the fourth interface component 124 through the internal flow channel of the valve core 110, forming a second connection passage independent of the first connection passage. In the second connection passage, the third interface component 123 draws oil from the receiving cavity of the oil tank 10. After the second drive component 300 is activated, the oil is transported from the third interface component 123 through the internal flow channel of the valve core 110 to the second interface component 122. The oil then enters the second drive component 300 through the second interface component 122, and is then transported by the second drive component 300 through the internal flow channel of the valve core 110 to the fourth interface component 124. Finally, the oil is injected into the gearbox through the fourth interface component 124, thereby realizing the return of oil from the oil tank 10 to the gearbox.

[0052] For example, the second interface component 122 may also include multiple independently configured interfaces. The interfaces of the second interface component 122 can communicate with another flow channel inside the valve core 110, and through this flow channel, communicate with another interface of the third interface component 123 and another interface of the fourth interface component 124, thereby forming a second connection path. That is, different interfaces of the third interface component 123 and the fourth interface component 124 can be connected to different flow channels of the valve core 110.

[0053] It should also be noted that the first and second connecting passages are set independently, isolating their flow paths within the valve core 110. This design effectively prevents interference between the two connecting passages, ensuring the accuracy of unidirectional oil flow control. For example, when the first connecting passage is in oil recovery mode, the second connecting passage is in a non-operating state; similarly, when the second connecting passage is in oil reinjection mode, the first connecting passage is in a non-operating state. This ensures that the oil return device can reliably switch between the two modes of recovering leaked oil and replenishing oil.

[0054] It is understandable that integrating the first drive component 200 and the second drive component 300 into the valve block 100 via the first interface component 121 and the second interface component 122 respectively can reduce external pipelines and assembly nodes, making the oil return device structure more compact and reducing the complexity of the oil return device.

[0055] The connection between the gearbox and the fourth interface component 124 can be a flexible hose or a rigid pipe, and this embodiment of the application does not impose any limitations on it.

[0056] Therefore, see Figure 10 The oil return device of this application, through the coordinated operation of the oil tank 10 and the drive structure 20, utilizes the valve core 110 in the valve block 100 to control each interface component, forming an independently configured first connection path and a second connection path. The first drive component 200 and the second drive component 300 respectively achieve the recovery of oil leakage from the gearbox and the replenishment of oil from the oil tank 10 to the gearbox. This configuration reduces the frequency of gearbox maintenance and repair, lowering operating costs. Furthermore, by incorporating the oil return device, maintenance and repair of the gearbox can be performed without stopping the machine, thereby improving operational efficiency.

[0057] See Figures 6 to 9 In some embodiments, the valve core 110 has a polyhedral structure and includes multiple sidewalls 111. At least two of the first interface assembly 121, the second interface assembly 122, the third interface assembly 123, and the fourth interface assembly 124 are located on different sidewalls 111.

[0058] It is understood that the valve core 110 can adopt a polyhedral structure, such as a cube, a regular prism, etc., so that at least two of the first interface component 121, the second interface component 122, the third interface component 123 and the fourth interface component 124 are respectively disposed on different sidewalls 111, and the isolation between the interface components is achieved through the spatial layout of the polyhedron.

[0059] The following description uses a cubic structure for the valve core 110 as an example. The valve core 110 includes a first sidewall, a second sidewall, a third sidewall, a fourth sidewall, a fifth sidewall, and a sixth sidewall that are connected sequentially. Optionally, the first interface component 121 can be disposed on the first sidewall, facing and connecting to the first drive member 200. The second interface component 122 can be disposed on the second sidewall, facing and connecting to the second drive member 300. The fourth interface component 124 can be disposed on the third sidewall, connecting to the oil drain port and oil fill port of the gearbox via a pipeline. Some of the third interface components 123 can share the third sidewall with the fourth interface component 124, while some of the third interface components 123 can be disposed on the fourth sidewall to communicate with the oil tank 10. This arrangement reduces the probability of pipeline interference caused by the coplanar arrangement of the interface components. In addition, it facilitates the connection of each interface component to the first drive member 200, the second drive member 300, the gearbox, and the oil tank 10.

[0060] Each interface component may include an oil pipe or a quick-connect fitting. The connection between each interface component and the valve core 110 can adopt an embedded sealing structure. For example, a connection hole 112 is opened in the side wall 111 of the valve core 110. Each interface component is fixed in the connection hole 112 by interference fit or thread, and radial sealing is achieved with the help of a sealing ring to reduce the probability of oil leakage.

[0061] See Figure 6 and Figure 7 In some embodiments, the first interface component 121, the second interface component 122, the third interface component 123, and the fourth interface component 124 each include an oil outlet and an oil inlet. The oil inlet of the fourth interface component 124, the oil inlet of the first interface component 121, the first drive member 200, the oil outlet of the first interface component 121, and the oil outlet of the third interface component 123 are sequentially connected. The oil inlet of the third interface component 123, the oil inlet of the second interface component 122, the second drive member 300, the oil outlet of the second interface component 122, and the oil outlet of the fourth interface component 124 are sequentially connected.

[0062] It is understandable that the first interface component 121, the second interface component 122, the third interface component 123 and the fourth interface component 124 can all adopt dual interfaces, that is, they can all include an oil outlet and an oil inlet, thereby realizing bidirectional flow of oil.

[0063] Optionally, the first interface component 121 may include a first oil outlet 121a and a first oil inlet 121b; the second interface component 122 may include a second oil outlet 122a and a second oil inlet 122b; the third interface component 123 may include a third oil outlet 123a and a third oil inlet 123b; and the fourth interface component 124 may include a fourth oil outlet 124a and a fourth oil inlet 124b. See also... Figure 3 The oil tank 10 may include a first connection port 13 and a second connection port 14. The first connection port 13 is connected to the third oil outlet 123a, and the second connection port 14 is connected to the third oil inlet 123b.

[0064] In the first connection passage, the fourth oil inlet 124b is connected to the oil leak port of the gearbox. When the first drive unit 200 is activated, the resulting suction forces the leaking oil from the gearbox into the valve core 110 through the fourth oil inlet 124b. Subsequently, the oil flows sequentially through the first oil inlet 121b and the first drive unit 200. Under the action of the first drive unit 200, the oil flows out from the first oil outlet 121a to the valve core 110, and finally enters the receiving cavity of the oil tank 10 through the third oil outlet 123a. This allows the oil to be efficiently recovered from the gearbox leak point to the oil tank 10 along a predetermined path, achieving one-way oil recovery.

[0065] In the second connection passage, when the second drive unit 300 is started, the third oil inlet 123b draws oil from the receiving cavity of the oil tank 10. After the oil flows into the valve core 110 through the third oil inlet 123b, it passes through the second oil inlet 122b and the second drive unit 300 in sequence. Under the pressure of the second drive unit 300, the oil flows out from the second oil outlet 122a to the valve core 110 and is injected into the gearbox through the fourth oil outlet 124a to replenish the gearbox with oil.

[0066] The oil outlet and oil inlet of each interface component in the first connection path and the second connection path are connected in a predetermined order and isolated from each other, which can ensure that the oil flows unidirectionally in their respective paths, thereby avoiding the problem of oil cross-flow.

[0067] See Figure 2 In some embodiments, a control component 30 is also included. The control component 30 includes a timing element, a liquid level detection element 31, and a control element. The timing element and the liquid level detection element 31 are both communicatively connected to the control element. The liquid level detection element 31 is used to monitor the oil level in the accommodating cavity. The control element is communicatively connected to the drive structure 20.

[0068] Optionally, the level detection element 31 can be installed on the inner wall or top of the oil tank 10, and can employ ultrasonic, float-type, or hydrostatic detection principles to monitor changes in the oil level within the containment cavity in real time. For example, a float-type detection element can utilize the characteristic of a float rising and falling with the oil, converting level changes into electrical signals through a mechanical linkage device or magnetic coupling principle. The monitored level data can be transmitted to the control unit in real time. When the monitored level in the oil tank 10 is higher than a first preset level, the control unit can control the second drive element 300 to start, thereby refilling the gearbox with oil; when the monitored level in the oil tank 10 is lower than the second preset level, the control unit can control the second drive element 300 to shut down, thereby stopping the refilling of oil into the gearbox. The second preset level is lower than the first preset level.

[0069] The timing element can be a timing control device, thereby enabling the regulation of the operating sequence of the oil return device. For example, the first drive unit 200 can be set to automatically start within a predetermined time period after the oil return device is started, performing timed oil recovery operations at the gearbox leakage port to ensure that the leaked oil is promptly drawn into the oil tank 10's receiving cavity, preventing oil from accumulating around the gearbox for a long time and causing safety hazards. In specific implementation, the control unit can control the start and stop of the first drive unit 200 based on the timing information from the timing element. For example, the control unit can start the first drive unit 200 every 8 hours, run it for 5 minutes each time, and then control the first drive unit 200 to stop running. This embodiment of the application does not impose any limitations on this.

[0070] In addition, if the liquid level detection element 31 fails during use, the second drive element 300 can be protected against power failure by delay through the timing control function of the timing element.

[0071] In other embodiments, the control component 30 further includes a power supply component 32 for supplying power to the drive structure 20 and the control component 30.

[0072] Optionally, the power supply unit 32 may include a switching power supply module to convert externally input AC power into a stable DC voltage. It may also include a rechargeable battery pack. This enables the drive structure 20 and the control component 30 to operate stably.

[0073] See Figure 2 In some embodiments, the oil return device further includes a heating element 40 disposed within the receiving cavity, which is used to regulate the oil temperature within the receiving cavity. The control assembly 30 also includes a temperature detection element 33, which is communicatively connected to the control assembly and is used to monitor the oil temperature.

[0074] It should be noted that the heating element 40 may include a resistance wire heating rod, a ceramic heating plate, etc., for heating the oil in the receiving cavity. The temperature detection element 33 may include a thermocouple or a thermistor sensor, installed on the side wall or bottom of the oil tank 10 to ensure contact with the oil, so as to monitor the oil temperature in the receiving cavity in real time. The temperature detection element 33 converts the collected temperature signal into an electrical signal for transmission to the control element. The control element is set with a preset temperature threshold range. When the oil temperature fed back by the temperature detection element 33 is lower than the preset temperature threshold range, in order to avoid the oil viscosity from being too high due to low temperature affecting the oil return to the gearbox, the control element can send a start command to the heating element 40 to start the heating element 40 and gradually increase the oil temperature; when the oil temperature exceeds the preset temperature threshold range, the control element controls the heating element 40 to stop heating. Optionally, the preset temperature threshold range can be set between 25°C and 45°C. When the oil temperature is lower than 25°C, the heating element 40 can be started to heat the oil; when the oil temperature is higher than 45°C, the heating element 40 can be controlled to stop heating.

[0075] Furthermore, the control unit can determine whether oil heating is required based on the oil temperature monitored by the temperature detection unit 33 and the oil level monitored by the level detection unit 31. For example, when the oil level is lower than the second preset level, the control unit can control the heating element 40 to stop heating, thereby realizing intelligent temperature management of the oil return device operation.

[0076] In actual use, if the temperature detection element 33 fails, the heating element 40 can be protected against power failure by delay through the timing control function of the timing element.

[0077] See Figure 1 and Figure 6 In some embodiments, the oil return device further includes a filter element 50 disposed in the oil tank 10. The valve block 100 also includes a fifth interface assembly 125 disposed on the valve core 110, the fifth interface assembly 125 being located in the second connection passage and connected to the filter element 50, the filter element 50 being used to filter the oil in the second connection passage.

[0078] It should be noted that the filter element 50 may include a filter with a filter screen and a filter element for filtering the oil recovered in the oil tank 10. Specifically, the fifth interface assembly 125 may include a fifth oil outlet 125a and a fifth oil inlet 125b. During the oil transfer process in the second connection passage, when the oil in the receiving cavity of the oil tank 10 flows into the valve block 100 through the third oil inlet 123b, and then through the valve block 100, through the second oil inlet 122b and the second drive member 300, it flows out through the second oil outlet 122a and then enters the filter element 50 through the fifth oil inlet 125b. After the oil is filtered in the filter element 50 to remove impurities, it flows back to the internal flow channel of the valve core 110 through the fifth oil outlet 125a and is injected into the gearbox through the fourth oil outlet 124a.

[0079] This design ensures that the oil injected into the gearbox remains clean, effectively preventing impurities from entering the gearbox and causing problems such as component wear and oil circuit blockage, thus improving the operational reliability and service life of the gearbox. Furthermore, the filter element 50 may also include a differential pressure switch 51. When the filter element pressure in the filter element 50 falls below a preset value, the differential pressure switch 51 can issue an alarm signal to remind personnel to replace the filter element.

[0080] See Figure 1 and Figure 7 In some embodiments, the valve block 100 is also provided with a pressure test port 130, a pressure detection element 140 and an overflow valve 150, wherein the pressure detection element 140 is used to monitor the oil injection pressure.

[0081] It should be noted that by integrating the pressure measuring port 130, the pressure detection element 140, and the overflow valve 150 on the valve block 100, the oil injection pressure can be monitored and protected, effectively ensuring the safe and stable operation of the oil return device.

[0082] The pressure testing port 130 may include a threaded interface, a quick-connect interface, etc., to facilitate connection with an external pressure detection device, thereby verifying the measurement accuracy of the pressure detection element 140. In specific implementations, when no external pressure detection device is required, the pressure testing port 130 can be sealed with a sealing component to ensure the sealing of the valve block 100. The pressure detection element 140 may include a pressure gauge, which is installed in the valve core 110 via a threaded connection or flange connection, ensuring communication with the internal oil flow channel of the valve core 110, and enabling real-time monitoring of the oil injection pressure in the second connection passage.

[0083] In a specific implementation, the pressure detection element 140 may have a switch. When the switch is in the open state, the pressure detection element 140 can monitor the oil injection pressure in real time. When an external pressure detection device verifies the measured value of the pressure detection element 140 through the pressure measuring port 130 and finds a deviation, the switch can be closed to stop the pressure detection element 140 from monitoring the oil injection pressure, so as to facilitate the disassembly of the pressure detection element 140 for maintenance or replacement.

[0084] As a pressure safety protection device, the relief valve 150 can be activated when the pressure detection element 140 detects that the oil injection pressure exceeds the preset safety pressure value. Part of the oil flows back to the oil tank 10 through the relief valve 150, thereby reducing the pressure in the second connection passage.

[0085] In some embodiments, the valve block 100 is also provided with a switch 160 and a drain valve 170. The switch 160 is used to control the connection and disconnection between the receiving cavity and the second drive member 300, and the drain valve 170 is used to discharge the oil in the valve block 100.

[0086] Optionally, the switching element 160 may include a structure such as a solenoid directional valve or a manual ball valve, which is installed on the valve block 100 and can act on the second connection passage between the receiving cavity and the second driving element 300 to realize the on / off control of the second connection passage. In specific implementation, if a manual ball valve is used, the on / off of the second connection passage can be realized by operating the handle, thereby adapting to scenarios that require manual intervention or emergency control.

[0087] It should also be noted that the drain valve 170 may be a threaded plug valve or a gate valve, facilitating the discharge of residual oil inside the valve block 100 during maintenance or repair. Furthermore, the drain valve 170 can also be used to release air during the commissioning phase of the return oil device, preventing air resistance from affecting the normal flow of oil.

[0088] By setting the switch 160 and the drain valve 170, the oil return device becomes more flexible and efficient in operation control and maintenance, further improving the practicality and reliability of the oil return device.

[0089] See Figure 1 In some embodiments, the oil return device further includes a one-way valve 60, which is disposed between the first drive member 200 and the receiving cavity to prevent oil backflow.

[0090] Understandably, the one-way valve 60 provides reliable backflow prevention for the oil transmission in the first connection passage, effectively improving the stability and reliability of the oil return device. The one-way valve 60 is installed in the oil tank 10 and can act on the first connecting pipeline between the first drive component 200 and the receiving cavity of the oil tank 10.

[0091] Taking a ball-shaped check valve 60 as an example, the ball-shaped check valve may include a movable ball valve core and a resilient reset component. When the first drive unit 200 is activated and a positive flow of oil recovery is formed, the pressure generated by the oil pushes the valve core of the ball-shaped check valve to open, allowing the oil to flow smoothly through the check valve 60 and into the receiving cavity of the oil tank 10 from the oil outlet of the third interface assembly 123. When the oil shows a reverse flow tendency, the resilient reset component of the ball-shaped check valve pushes the valve core to close, blocking the oil passage and preventing the oil in the oil tank 10 from flowing back to the first drive unit 200 or the gearbox oil leak through the first connection passage.

[0092] In some possible embodiments, the oil return device further includes an air filter 70, which is disposed in the oil tank 10 and communicates with the receiving cavity. The air filter 70 is used to discharge the gas in the receiving cavity and prevent external gas from entering the receiving cavity.

[0093] Optionally, the air filter 70 can be installed on top of the oil tank 10 by means of threaded connection, flange connection, etc., to ensure reliable communication with the receiving cavity.

[0094] Air filter 70 may include filtration structures such as filter screens, filter paper, activated carbon fiber felt, etc., which can effectively filter fine particles and adsorb oil vapor and moisture. When the oil return device is operating, and the pressure in the receiving chamber changes due to oil recovery or injection, air filter 70 can automatically balance the pressure. When oil injection increases the pressure in the chamber, the gas is filtered through air filter 70 and discharged to prevent oil mist leakage.

[0095] In some embodiments, the first drive member 200 includes a first motor and a first pump body driven by the first motor. The second drive member 300 includes a second motor and a second pump body driven by the second motor. The first pump body includes a peristaltic pump, and the second pump body includes a gear pump. Thus, the first drive member 200 and the second drive member 300 can work together to achieve bidirectional oil transfer.

[0096] Understandably, the first motor in the first drive unit 200 provides a power source for the first pump body. The first motor may include a two-phase AC motor with a power range between 60W and 500W. The first pump body may be configured as a peristaltic pump to draw oil from the fourth interface assembly 124 and push the oil along the first connection passage by compression, thereby delivering it to the receiving cavity of the oil tank 10. The peristaltic pump has the advantage of strong sealing, which can effectively prevent oil leakage.

[0097] The second motor may include a three-phase AC motor with a power range of 0.25 kW to 0.75 kW. The second pump body may be a gear pump, internally equipped with meshing drive and driven gears. When the second motor drives the drive gear to rotate, the driven gear rotates accordingly. During the meshing and disengagement of the gears, the volume of the gear pump chamber changes, generating oil suction and pressure. In the second connection passage, the gear pump draws oil from the oil tank 10's receiving cavity, pressurizes the oil through the rotation of the gears, and injects it into the gearbox via the fourth interface assembly 124. The gear pump has a high pressure output capacity, ensuring sufficient pressure and flow when injecting oil into the gearbox, thereby meeting the gearbox's lubrication requirements. Furthermore, if the first drive component 200 or the second drive component 300 experiences overload, short circuit, or open circuit during use, the corresponding electrical circuit can trip to protect the first drive component 200 and the second drive component 300.

[0098] In some embodiments, the oil tank 10 is provided with an oil drain port 11 and an oil filling port 12 communicating with the receiving cavity. The oil filling port 12 is provided with a removable first sealing member, and the oil drain port 11 is provided with a removable second sealing member. The oil drain port 11 is used to drain the oil in the receiving cavity.

[0099] It should be noted that, in order to perform pre-use debugging of the oil return device, the oil tank 10 can be equipped with an oil inlet 12, and the oil inlet 12 is equipped with a removable first sealing component. Specifically, during the debugging phase, the first sealing component can be removed to inject oil into the oil tank 10, and then the first sealing component can be used to seal the oil inlet 12 to prevent external impurities from entering the oil tank 10. Then, the oil return device is started to check whether the oil transmission function of the second connection passage is normal. In addition, the corresponding data fed back by the pressure detection device 140, the liquid level detection device 31, and the temperature detection device 33 are observed to determine whether the operation of each component of the oil return device is stable.

[0100] In practice, after long-term use, the oil will become mixed with impurities. After entering the receiving cavity, these impurities will settle at the bottom of the oil tank 10. Therefore, the drain port 11 can be located at a lower position at the bottom of the oil tank 10, utilizing the oil's own gravity to achieve the discharge function. When cleaning or maintenance of the oil tank 10 is required, the operator removes the second sealing component, and the oil can then be discharged through the drain port 11 to a collection container outside the oil tank 10 under the action of gravity, thereby ensuring the cleanliness of the inside of the oil tank 10 and guaranteeing the stable operation of the oil return device.

[0101] See Figure 4 and Figure 5 In some embodiments, a fixing bracket 80 is also included. The fixing bracket 80 is disposed on the oil tank 10 and fixedly connected to the second driving member 300. The fixing bracket 80 is used to fix the second driving member 300.

[0102] Understandably, the fixed bracket 80 can be securely installed on the top or side wall of the oil tank 10 by welding, bolting, or snap-fitting. The fixed bracket 80 can be equipped with a fixing structure adapted to the second drive component 300, such as a mounting plate with bolt holes corresponding to the mounting holes of the second drive component 300, and the second drive component 300 can be fixed by bolts and nuts. Alternatively, the fixing structure can be a clamp-type structure, using clamps to surround the shell of the second drive component 300 to fix the second drive component 300, thereby reducing the vibration of the second drive component 300 during operation.

[0103] Based on the above embodiments, this application provides a wind turbine generator set, including a generator, a gearbox, and an oil return device provided in any of the above embodiments. The fourth interface component 124 of the oil return device is connected to the gearbox and is disposed at the connection between the gearbox and the generator.

[0104] The oil return device has been described in detail in the above embodiments and will not be repeated here.

[0105] Understandably, during actual operation, when oil leakage occurs at the connection between the gearbox and the generator, the first drive component 200 can promptly recover the leaked oil into the receiving cavity of the oil tank 10 through the first connection passage. When the oil level in the gearbox is insufficient, the second drive component 300 can re-inject the filtered oil from the oil tank 10 into the gearbox through the second connection passage to maintain normal lubrication of the gearbox. Recovering and re-injecting leaked oil from the gearbox through the oil return device can improve the reliability of the wind turbine generator's transmission system, reduce the frequency of manual maintenance, extend the service life of the gearbox and generator, and ensure the stable operation of the wind turbine generator.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An oil return device, characterized in that, include: The oil tank (10) has a receiving cavity for containing oil. A drive structure (20) is disposed in the oil tank (10). The drive structure (20) includes a valve block (100), a first drive member (200), and a second drive member (300). The valve block (100) includes a valve core (110) and a first interface assembly (121), a second interface assembly (122), a third interface assembly (123), and a fourth interface assembly (124) disposed on the valve core (110). The first interface assembly (121) is connected to the first drive member (200), the second interface assembly (122) is connected to the second drive member (300), the third interface assembly (123) communicates with the receiving cavity, and the fourth interface assembly (124) is used to communicate with the gearbox. The first interface component (121) is connected to a portion of the third interface component (123) and a portion of the fourth interface component (124) to form a first connection path. The first drive member (200) is used to draw oil from the oil drain port of the gearbox into the receiving cavity through the first connection path. The second interface component (122) is connected to a portion of the third interface component (123) and a portion of the fourth interface component (124) to form a second connection path. The first connection path and the second connection path are independently arranged. The second drive member (300) is used to inject oil from the receiving cavity into the gearbox through the second connection path.

2. The oil return device according to claim 1, characterized in that, The valve core (110) has a polyhedral structure and includes multiple sidewalls (111). At least two of the first interface component (121), the second interface component (122), the third interface component (123), and the fourth interface component (124) are located on different sidewalls (111).

3. The oil return device according to claim 1, characterized in that, The first interface component (121), the second interface component (122), the third interface component (123), and the fourth interface component (124) all include an oil outlet and an oil inlet; The oil inlet of the fourth interface component (124), the oil inlet of the first interface component (121), the first drive unit (200), the oil outlet of the first interface component (121), and the oil outlet of the third interface component (123) are connected in sequence. The oil inlet of the third interface component (123), the oil inlet of the second interface component (122), the second drive (300), the oil outlet of the second interface component (122), and the oil outlet of the fourth interface component (124) are connected in sequence.

4. The oil return device according to claim 1, characterized in that, It also includes a control component (30), which includes a timing element, a liquid level detection element (31) and a control element. The timing element and the liquid level detection element (31) are both communicatively connected to the control element. The liquid level detection element (31) is used to monitor the oil level in the accommodating cavity. The control element is communicatively connected to the drive structure (20). And / or, the control component (30) further includes a power supply component (32) for supplying power to the drive structure (20) and the control component (30).

5. The oil return device according to claim 4, characterized in that, It also includes a heating element (40), which is disposed in the receiving cavity and is used to adjust the temperature of the oil in the receiving cavity; The control component (30) further includes a temperature detection element (33), which is communicatively connected to the control component and is used to monitor the oil temperature.

6. The oil return device according to any one of claims 1 to 5, characterized in that, It also includes a filter element (50) disposed in the oil tank (10); The valve block (100) further includes a fifth interface assembly (125) disposed on the valve core (110), the fifth interface assembly (125) being located in the second connection passage and connected to the filter element (50), the filter element (50) being used to filter oil in the second connection passage.

7. The oil return device according to any one of claims 1 to 5, characterized in that, The valve block (100) is also provided with a pressure measuring port (130), a pressure detection element (140) and an overflow valve (150), wherein the pressure detection element (140) is used to monitor the oil injection pressure; And / or, the valve block (100) is further provided with a switch (160) and a drain valve (170), the switch (160) being used to control the connection and disconnection between the receiving cavity and the second drive member (300), and the drain valve (170) being used to discharge the oil in the valve block (100).

8. The oil return device according to any one of claims 1 to 5, characterized in that, It also includes a one-way valve (60), which is disposed between the first drive member (200) and the receiving cavity to prevent oil backflow; And / or, it also includes an air filter (70) disposed in the oil tank (10) and in communication with the containment cavity, the air filter (70) being used to discharge gas in the containment cavity and prevent external gas from entering the containment cavity.

9. The oil return device according to any one of claims 1 to 5, characterized in that, The first driving component (200) includes a first motor and a first pump body driven by the first motor; The second drive unit (300) includes a second motor and a second pump body driven by the second motor; The first pump body includes a peristaltic pump, and the second pump body includes a gear pump.

10. The oil return device according to any one of claims 1 to 5, characterized in that, The oil tank (10) is provided with an oil drain port (11) and an oil filling port (12) communicating with the receiving cavity. The oil filling port (12) is provided with a detachable first sealing member, and the oil drain port (11) is provided with a detachable second sealing member. The oil drain port (11) is used to drain the oil in the receiving cavity.

11. The oil return device according to any one of claims 1 to 5, characterized in that, It also includes a fixing bracket (80), which is disposed on the oil tank (10) and fixedly connected to the second drive member (300). The fixing bracket (80) is used to fix the second drive member (300).

12. A wind turbine generator set, characterized in that, It includes a generator, a gearbox, and an oil return device as described in any one of claims 1 to 11, wherein a fourth interface assembly (124) of the oil return device is connected to the gearbox and disposed at the connection between the gearbox and the generator.

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