Lubricating and sealing structure, main shaft matching structure and wind driven generator
By employing a lubrication and sealing design in wind turbines using end caps, seals, and pressure plates, the problem of lubricating oil leakage was solved, achieving effective sealing and recycling of the oil, and reducing costs and risks.
Patent Information
- Application Number
- CN202511755994.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-02-17
AI Technical Summary
Existing wind turbines have problems with lubricating oil leakage, especially when the seal fails, which leads to the transmission chain running without oil and potential environmental, health and safety risks. In addition, the existing sealing structure is costly and redundant.
The lubrication and sealing structure includes an end cap, a seal, and a pressure plate. The end cap is connected to the bearing housing end face, the seal seals the gap between the rotating shaft, and the pressure plate forms an oil return channel to prevent oil leakage. It also acts as a leak-proof safety device after the seal fails, enabling the recycling of oil.
It effectively prevents lubricating oil leakage, reduces the cost of sealing structures, reduces the risk of transmission chain lubrication shortage, reduces environmental and safety hazards, and enables the recycling and reuse of oil.
Smart Images
Figure CN121539620A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of wind power generation technology, and in particular to a lubrication and sealing structure, a main shaft mating structure, and a wind turbine. Background Technology
[0002] With the continuous development of new energy technologies, the proportion of wind power generation is also constantly increasing. Wind power generation utilizes the widely flowing wind in nature to generate electricity. The wind drives the blades of the wind turbine to rotate, converting wind energy into mechanical energy, which in turn drives the rotor to generate electricity. Since no pollutants are produced during the power generation process, it is relatively environmentally friendly and is an important source of electricity among new energy sources.
[0003] Wind turbines have many components, and lubricating oil is used for lubrication during operation to prevent malfunctions due to insufficient lubrication. Preventing lubricating oil leakage is therefore an important issue. Summary of the Invention
[0004] The purpose of this application is to provide a lubrication and sealing structure, a main shaft mating structure, and a wind turbine generator, which can help prevent lubricating oil leakage.
[0005] To address the aforementioned technical problems, this application provides a lubrication sealing structure. The lubrication sealing structure is used to seal the end face of a bearing housing. The lubrication sealing structure includes an end cap, a sealing element, and a pressure plate structure. The end cap is arranged around a predetermined axis, connected to the end face of the bearing housing, and forms a seal with the end face of the bearing housing. The inner ring of the end cap has a limiting portion protruding towards the predetermined axis. The sealing element is disposed within the inner ring of the end cap, with one side abutting against the limiting portion. The pressure plate structure is connected to the end cap and located on the side of the end cap away from the bearing housing. The pressure plate structure abuts against the other side of the sealing element away from the limiting portion. The pressure plate structure has an oil return channel, one end of which is oriented towards the predetermined axis, and the other end of which is connected to a lubrication oil passage on the bearing housing.
[0006] This application also provides a spindle mating structure. The spindle mating structure includes a bearing housing, a spindle, and the aforementioned lubrication and sealing structure. The spindle is rotatably connected to the bearing housing. The end cap of the lubrication and sealing structure is connected to the end face of the bearing housing.
[0007] The embodiments of this application also provide a wind turbine generator, which includes the main shaft mating structure described above.
[0008] The lubrication and sealing structure, main shaft mating structure, and wind turbine provided in this application utilize the end cover and the end face of the bearing housing to form a sealed connection, creating the first line of defense. A seal is provided on the inner ring of the end cover, sealing the gap between the end cover and the rotating shaft on the bearing housing, thus isolating the bearing lubricating oil chamber inside the end cover from the external environment outside the end cover. On the outside of the seal, a pressure plate structure forms a return oil channel, preventing leakage in case of seal failure, forming a separate safety measure. The sealing structure effectively seals the lubricating oil through the cooperation of different components, preventing leakage.
[0009] In some embodiments, the pressure plate structure includes an arc-shaped return oil pressure plate and a sealing pressure plate, which are spliced together to form a ring, and the return oil pressure plate is provided with an oil return channel.
[0010] In some embodiments, a groove is provided on the side of the oil return pressure plate near the preset axis, the groove extends in the direction surrounding the preset axis, and one end of the oil return channel is located in the groove.
[0011] In some embodiments, the return oil pressure plate is provided with a mounting groove on the side near the preset axis. The mounting groove extends in the direction surrounding the preset axis and is located on the side of the groove away from the bearing seat. The mounting groove is provided with a dustproof component.
[0012] In some embodiments, a first dustproof sealing gasket and a second dustproof sealing gasket are respectively provided at both ends of the return oil pressure plate. The first dustproof sealing gasket seals one end of the groove, and the second dustproof sealing gasket seals the other end of the groove.
[0013] In some implementations, a filter element is provided in the oil return channel.
[0014] In some embodiments, the end cap is provided with an oil passage, one end of which is oriented toward a preset axis, and the other end of which is connected to the lubricating oil chamber in the bearing housing.
[0015] In some embodiments, there are multiple oil passages arranged circumferentially around a predetermined axis. Attached Figure Description
[0016] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0017] Figure 1 This is a three-dimensional structural schematic diagram of the lubrication and sealing structure provided in some embodiments of this application; Figure 2 yes Figure 1Enlarged structural diagram at point A; Figure 3 This is a side view schematic diagram of the lubrication and sealing structure provided in some embodiments of this application; Figure 4 This is a partial structural diagram of the lubrication and sealing structure provided in some embodiments of this application when it is fitted with the bearing housing; Figure 5 This is a partially enlarged schematic diagram of the lubrication and sealing structure provided in some embodiments of this application when it mates with the bearing housing; Figure 6 This is a schematic diagram of the spindle mating structure provided in some embodiments of this application. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this application to enable readers to better understand this application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.
[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0020] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," and "joining" 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 or an electrical 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 the embodiments of this application according to the specific circumstances.
[0021] As wind turbines become larger and more integrated in their drivetrain designs, oil lubrication has become a more common method. However, when using oil lubrication, if a seal fails, thousands of liters of oil can leak, causing the drivetrain lubrication system to operate without sufficient oil. This can easily lead to the failure of large components such as main bearings and gearboxes. Furthermore, the difficulty in cleaning the oil can pose potential EHS (Environmental, Health, and Safety) risks.
[0022] In large-megawatt wind turbine drive trains, the combined effects of bending moment and torque cause system deformation that can affect the bearing seal contact state. If a single-rotating shaft lip seal is used, a large interference fit is required. However, given the current trend of cost reduction in wind turbines, shaftless main shaft structures pose a risk of wear and breakage. Furthermore, the radial and axial deformation of the sealing structure becomes uncontrollable due to wind load, making it difficult to ensure proper compensation and proper sealing system follow-up.
[0023] Currently, wind turbines mostly adopt integrated drivetrain structures, and the low-speed main shaft system in these drivetrains often uses TRB shaft systems with oil lubrication. There are two main types of sealing structures for integrated drivetrain main shaft systems: the first uses a complex labyrinth seal, and the second uses an inner main seal plus an outer dust seal. Both of these sealing structures only consider oil sealing within the system and do not account for oil return lubrication of the bearings, which is detrimental to the self-lubricating design of the integrated drivetrain. Furthermore, both solutions employ multiple seals and large end caps, resulting in high sealing system costs and design redundancy.
[0024] To enable the integrated drivetrain sealing system to return oil to the main bearing and recover oil overflowing due to seal failure, thus avoiding the risk of insufficient oil in the main bearing due to seal failure, some embodiments of this application provide a lubrication sealing structure that can be used in wind turbines. The lubrication sealing structure uses a U-shaped pressure plate in conjunction with an end cap for sealing. The pressure plate, as the outer structural component, acts as a leak-proof safety measure in case of seal failure. Overflowing oil can return through channels within the pressure plate, thereby preventing lubricant leakage. Furthermore, both the end cap and the pressure plate can be made of low-cost structural components, reducing the cost of the sealing structure.
[0025] The following is combined Figures 1 to 6 This application describes some embodiments of the lubrication and sealing structure provided. The lubrication and sealing structure is used to seal the end face of a bearing housing. The bearing housing can be any bearing housing found in any device that mates with a rotating shaft. The embodiments of this application use... Figure 6 The following explanation uses the bearing housing that mates with the main shaft in the wind turbine as an example.
[0026] like Figures 1 to 5As shown, some embodiments of this application provide a lubrication and sealing structure including an end cap 11, a seal 12, and a pressure plate structure 13. The end cap 11 is arranged around a predetermined axis, connected to the end face of the bearing housing 21, and forms a seal with the end face of the bearing housing 21. The inner ring of the end cap 11 is provided with a limiting portion 111 protruding towards the predetermined axis. The seal 12 is disposed within the inner ring of the end cap 11, with one side of the seal 12 abutting against the limiting portion 111. The pressure plate structure 13 is connected to the end cap 11 and located on the side of the end cap 11 away from the bearing housing 21. The pressure plate structure 13 abuts against the other side of the seal 12 away from the limiting portion 111. The pressure plate structure 13 is provided with an oil return channel 1301, one end of which is oriented towards the predetermined axis, and the other end of which is connected to the lubrication oil passage on the bearing housing 21.
[0027] End cap 11 is the first line of defense in the lubrication and sealing structure. End cap 11 is fitted snugly to the end face of bearing housing 21. The end face of bearing housing 21 corresponds to the bearing mounting position, i.e., the mating position between the rotating shaft and bearing housing 21. The bearing is lubricated with lubricating oil, and end cap 11 forms the first line of defense against oil leakage at the end face of bearing housing 21. End cap 11 has a mounting portion and a sealing portion. The mounting portion can be fixed to the end face of bearing housing 21 with bolts or other fasteners. The part of the mounting portion that fits against the end face of bearing housing 21 can be sealed with a sealing ring to ensure the sealing performance at the mating point between end cap 11 and bearing housing 21. The sealing portion blocks one side of the bearing. The sealing portion includes the part of end cap 11 that extends into bearing housing 21 and the part near the rotating shaft, preventing oil from easily overflowing the end cap 11.
[0028] The end cap 11 is generally annular, with an inner ring through which a rotating shaft can pass. The preset axis is the central axis of the end cap 11, which is also the central axis of the rotating shaft. Furthermore, the inner ring has a limiting part 111, which serves as a limiting structure for the sealing ring, providing a positioning basis for it. The limiting part 111 also acts as a barrier for oil, positioned as close as possible to the rotating shaft on the bearing housing 21 to effectively prevent oil leakage.
[0029] The seal 12 is located on the inner ring of the end cover 11, and the seal 12 is annular around a predetermined axis. As a sealing ring, the seal 12 provides a good sealing effect. The seal 12 can seal between the end cover 11 and the central shaft, effectively preventing oil leakage. One side of the seal 12 abuts against the limiting portion 111 of the end cover 11, and is axially limited by the limiting portion 111.
[0030] The pressure plate structure 13 forms a third line of defense in the lubrication and sealing structure on the outside of the end cap 11. In the event of a small amount of oil leakage or wear and failure of the seal 12 due to long-term use, the pressure plate structure 13 can prevent oil leakage. The pressure plate structure 13 can be connected to the end cap 11 to axially limit the seal 12. Simultaneously, the pressure plate structure 13 is provided with an oil return channel 1301, which can be used to recover any small amount of leaked oil. The pressure plate structure 13 can be made of engineering plastics to reduce the cost of the sealing structure. At the same time, the end cap 11 can have a thinner wall thickness, which also helps to reduce the cost of the sealing structure.
[0031] The lubrication and sealing structure provided in some embodiments of this application utilizes the end cover 11 and the end face of the bearing housing 21 to form a sealed connection, creating a first line of defense. A seal 12 is provided on the inner ring of the end cover 11, which seals the gap between the end cover 11 and the rotating shaft on the bearing housing 21, isolating the bearing lubricating oil chamber inside the end cover 11 from the external environment outside the end cover 11. On the outside of the seal 12, a return oil channel 1301 is formed by a pressure plate structure 13, which prevents leakage after the seal 12 fails, forming a separate safety barrier. The sealing structure effectively seals the lubricating oil through the cooperation of different components.
[0032] In some embodiments, the pressure plate structure 13 may include an arc-shaped oil return pressure plate 131 and a sealing pressure plate 132, which are spliced together to form a ring, and the oil return pressure plate 131 is provided with an oil return channel 1301.
[0033] The return oil pressure plate 131 and the sealing pressure plate 132 combine to form the pressure plate structure 13. The return oil pressure plate 131 is provided with an oil return channel 1301, which can serve to return leaked oil. The sealing pressure plate 132, together with the return oil pressure plate 131, abuts against the outside of the seal 12 to form a tightly fitted sealing structure. The different pressure plates are arranged in an arc shape, surrounding a preset axis. Both the return oil pressure plate 131 and the sealing pressure plate 132 can be installed to one side of the end cover 11 using screws or other fasteners.
[0034] like Figure 3 As shown, the oil return pressure plate 131 can be installed at the bottom of the bearing housing 21, that is, near the oil return position inside the bearing housing 21. In practice, the top of the bearing housing 21 can serve as the oil inlet position during oil transportation, while the oil return pressure plate 131, installed at the bottom of the bearing housing 21, can connect the oil return channel 1301 to the oil return pipe on the bearing housing 21 via the branch pipe 14, thereby recovering the leaked oil to the oil return pipe. The number of sealing pressure plates 132 can be set to two or more. By setting a larger number of sealing pressure plates 132, the difficulty of fitting between components can be reduced.
[0035] like Figure 2 As shown, a groove 1311 can be provided on the side of the oil return pressure plate 131 near the preset axis. The groove 1311 extends in the direction surrounding the preset axis, and one end of the oil return channel 1301 is located in the groove 1311.
[0036] The groove 1311 provides favorable conditions for oil to enter the return oil channel 1301. The groove 1311 is arc-shaped and arranged circumferentially. The groove 1311 has a certain depth and width, allowing oil that has passed over the seal 12 to enter the groove 1311 and reach the end of the return oil channel 1301, thereby realizing oil return. The return oil channel 1301 can be set corresponding to the bottom end of the groove 1311. At the same time, the oil slinger on the spindle 22 can be set corresponding to the position of the groove 1311, so that the oil that has passed over the seal 12 can accurately enter the groove 1311.
[0037] In practice, the oil return pressure plate 131 may include a connected mounting part and an oil return part. The mounting part is connected to the end cover 11, and the oil return part is located on the side of the mounting part close to the preset axis. The groove 1311 is provided on the oil return part.
[0038] The mounting section is the part that connects the oil return pressure plate 131 to the end cover 11. Compared to the mounting section, the oil return section is closer to the preset axis. After the end cover 11 is connected to the bearing housing 21, the oil return section is close to the rotating shaft on the bearing housing 21, and the leaked oil can be transferred to the oil return section by the oil slinger on the rotating shaft, and then transported through the oil return channel 1301. A groove 1311 can be provided on the oil return section to receive the leaked oil. The thickness of the oil return section in the extension direction of the preset axis is greater than the thickness of the mounting section in the extension direction of the preset axis. The oil return section can utilize a thicker structure to set the groove 1311 and the oil return channel 1301. Below the oil return section, an oil return pipe can be connected to connect the oil return channel 1301 to the lubrication oil passage on the bearing housing 21.
[0039] In some embodiments, the return oil pressure plate 131 may be provided with a mounting groove 1312 on the side near the preset axis. The mounting groove 1312 extends in the direction surrounding the preset axis and is located on the side of the groove 1311 away from the bearing seat 21. The mounting groove 1312 is provided with a dustproof component 16.
[0040] The dustproof component 16 provides dust protection on the outside of the groove 1311, preventing dust and other impurities from entering the groove 1311 and thus preventing contamination of the oil inside the groove 1311. The mounting groove 1312 has a smaller size than the groove 1311. The bottom of the dustproof component 16 is inserted into the mounting groove 1312, and the part of the dustproof component 16 protruding from the mounting groove 1312 is isolated on the outside of the groove 1311, thus providing good dust protection.
[0041] like Figure 2 As shown, a first dustproof sealing gasket 17 and a second dustproof sealing gasket 18 can be respectively provided at both ends of the return oil pressure plate 131. The first dustproof sealing gasket 17 is sealed at one end of the groove 1311, and the second dustproof sealing gasket 18 is sealed at the other end of the groove 1311.
[0042] The dustproof sealing gasket can isolate the oil return pressure plate 131 at both ends, preventing dust and other impurities from entering the groove 1311 from the ends, thereby preventing contamination of the oil leaking into the groove 1311. The dustproof sealing gasket can be fixed by the cooperation between different pressure plates, thus stably playing an isolation role at the ends of the oil return pressure plate 131.
[0043] In some embodiments, the included angle between the two ends of the return oil pressure plate 131 and the preset axis is 60° to 80°.
[0044] By controlling the size of the arc angle formed by the return oil pressure plate 131 in the axial direction, it is possible to avoid the inability to effectively prevent oil leakage due to the small circumferential length of the return oil pressure plate 131, and also to avoid material waste due to the large circumferential length of the return oil pressure plate 131.
[0045] In practice, the circumferential length of the return oil pressure plate 131 can be controlled to be about 1 / 5 of the circumference of the pressure plate structure 13.
[0046] like Figure 5 As shown, a filter element 15 can be installed in the oil return channel 1301.
[0047] The filter element 15 can perform a filtering function in the oil return channel 1301, filtering impurities from the oil that leaks to the pressure plate structure 13. The oil return channel 1301 can be formed by setting stepped holes in the oil return pressure plate 131, and the filter element 15 can be installed using the stepped surface in the holes.
[0048] In some embodiments, the end cap 11 may be provided with an oil passage 101, one end of which is oriented toward a preset axis, and the other end of which is connected to the lubricating oil chamber in the bearing housing 21.
[0049] While forming the first line of defense, the end cap 11 can also be provided with an oil passage 101 to provide a channel for oil to reach the inner ring of the end cap 11, preventing the oil from bypassing the end cap 11 and reaching the location of the seal 12. The oil passage 101 is located on the side of the end cap 11 near the inside of the bearing housing 21, and can serve as a primary leak-proof structure.
[0050] In addition, there can be multiple oil passages 101, which are arranged circumferentially around a preset axis.
[0051] like Figure 5 As shown, the limiting part 111 of the inner ring of the end cap 11 forms a shoulder, which can serve as the first oil blocking structure. In practice, five oil return holes with a diameter of 18mm can be evenly arranged at 10° intervals on the bottom of the end cap 11. The oil return holes serve as oil passages 101, ensuring that the oil at the shoulder of the end cap 11 can return internally through the oil return holes.
[0052] In addition, the oil passage 101 and the oil return passage 1301 are located on the same side of the preset axis and are both set at the bottom of the bearing seat 21. This can be consistent with the position where the bottom oil may leak, thereby effectively achieving the function of preventing leakage.
[0053] The end cap 11 has no internal cavity, allowing for a smaller thickness. Actual testing revealed that the inner ring shoulder of the end cap 11, acting as the first line of defense, can prevent up to 70% of the oil from splashing back from the injection nozzle. The oil passage 101 of the end cap 11 allows approximately 10% of the oil to return to the lubrication chamber of the spindle bearing. The seal 12 effectively seals the gap, blocking approximately 19% of the oil. Furthermore, the return oil pressure plate 131's return oil passage 1301 allows overflowing oil to be filtered and reused, filtering and returning approximately 1% of any minor leaks.
[0054] The oil return pressure plate 131 is designed to address oil leakage points. The inner ring of the pressure plate uses a U-shaped groove to receive oil and filters the oil within the oil return channel 1301. On the inner side of the oil return pressure plate 131, the seal 12 and the spindle 22 shoulder are interference-fitted to achieve a good sealing effect. In practice, the shoulder of the inner ring of the end cover 11 and the oil passage 101 on the end cover 11 can prevent most of the oil leakage. The seal 12 can prevent the oil dripping on the shoulder of the spindle 22 from leaking out, and the return oil pressure plate 131, as a safety measure, can prevent the oil that has passed through the seal 12 from continuing to leak outward, so that the oil flows back to the return oil pipe on the bearing housing 21.
[0055] If the seal 12 wears out and fails after several years, reducing its sealing ability, and the oil overflows the seal 12 and reaches the pressure plate structure 13, it can be recovered through the oil return channel 1301 of the oil return pressure plate 131. The oil is thrown down by the oil slinger on the main shaft 22, enters the oil return channel 1301, is filtered by the filter screen, and then flows through the oil return pipe to the lubrication oil circuit on the bearing housing 21 for secondary filtration.
[0056] Some embodiments of this application also provide a spindle mating structure, such as Figure 6As shown, the spindle mating structure includes a bearing housing 21, a spindle 22, and the aforementioned lubrication and sealing structure. The spindle 22 is rotatably connected to the bearing housing 21. The end cap 11 of the lubrication and sealing structure is connected to the end face of the bearing housing 21.
[0057] The bearing housing 21 is mounted on the base of the wind turbine generator, the main shaft 22 is mounted inside the bearing housing 21, and the rear end of the bearing housing 21 is connected to the gearbox.
[0058] The main shaft 22 is the shaft of the wind turbine. The speed-increasing gearbox and generator of the wind turbine are installed in the nacelle, and the wind turbine is connected to the gearbox via the main shaft 22. The main shaft 22 not only transmits the torque of the wind turbine's rotation but also resists the oscillation of the wind turbine. The front end of the main shaft 22 has a hub connection flange for connecting the hub, and the rear end of the main shaft 22 is connected to the gearbox. The main shaft 22 can have through holes inside as channels for arranging control cables, oil lines, or mechanical rods for the pitch mechanism. The front end of the main shaft 22 is driven by blades, and the rear end of the main shaft 22 is connected to the gearbox to transmit power and drive the generator rotor to rotate, thus generating electricity.
[0059] In wind turbines, the lubrication and sealing system of the main shaft 22 bearing is an important structure to ensure the continuous and stable operation of the wind turbine. The lubrication and sealing structure can prevent the leakage of lubricating media, such as lubricating oil and grease, to ensure that the main shaft 22 bearing operates in a good lubrication system.
[0060] Some embodiments of this application also provide a wind turbine generator, which includes the main shaft mating structure described above.
[0061] Wind turbines generate electricity by rotating blades that drive a main shaft. Power is then transmitted through a gearbox, which in turn drives the generator's rotor. The main shaft is a crucial component for power transmission. It is mounted on bearing housings and requires lubrication to ensure smooth rotation. The base for installing a wind turbine can be built on land or sea. This base can support various types of towers, such as cylindrical, lattice, or hybrid towers, creating an installation platform for the wind turbines.
[0062] In practical applications, for the integrated drivetrain spindle system of wind turbines, the sealing dimensions can be determined based on the load and drivetrain layout. A thinner end cap design with an oil passage hole ensures that most of the oil can circulate internally, reducing the risk of oil overflowing to the lip. The return oil pressure plate ensures that overflowing oil undergoes preliminary filtration before flowing to the bearing housing return oil pipe. From there, it is pumped back to the gearbox for fine filtration, reducing the risk of oil leakage and enabling oil filtration and reuse.
[0063] Those skilled in the art will understand that the above embodiments are specific implementations of this application, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of this application.
Claims
1. A lubrication and sealing structure for sealing the end face of a bearing housing, characterized in that, include: An end cap is provided around a preset axis. The end cap is connected to the end face of the bearing seat and forms a seal with the end face of the bearing seat. The inner ring of the end cap is provided with a limiting part that protrudes toward the preset axis. A sealing element is disposed on the inner ring of the end cap, and one side of the sealing element abuts against the limiting portion; The pressure plate structure is connected to the end cover and located on the side of the end cover away from the bearing seat. The pressure plate structure abuts against the other side of the seal away from the limiting part. The pressure plate structure is provided with an oil return channel. One end of the oil return channel is set towards the preset axis, and the other end of the oil return channel is connected to the lubricating oil circuit on the bearing seat.
2. The lubrication and sealing structure according to claim 1, characterized in that, The pressure plate structure includes an arc-shaped oil return pressure plate and a sealing pressure plate, which are spliced together to form a ring. The oil return pressure plate is provided with the oil return channel.
3. The lubrication and sealing structure according to claim 2, characterized in that, The oil return pressure plate has a groove on one side near the preset axis, the groove extends in the direction surrounding the preset axis, and one end of the oil return channel is located in the groove.
4. The lubrication and sealing structure according to claim 3, characterized in that, The return oil pressure plate is provided with a mounting groove on the side near the preset axis. The mounting groove extends in the direction surrounding the preset axis and is located on the side of the groove away from the bearing seat. The mounting groove is provided with a dustproof component.
5. The lubrication and sealing structure according to claim 3, characterized in that, The return oil pressure plate is provided with a first dustproof sealing gasket and a second dustproof sealing gasket at both ends. The first dustproof sealing gasket seals one end of the groove, and the second dustproof sealing gasket seals the other end of the groove.
6. The lubrication and sealing structure according to claim 1, characterized in that, A filter element is installed in the oil return channel.
7. The lubrication and sealing structure according to claim 1, characterized in that, The end cap is provided with an oil passage, one end of which is oriented toward the preset axis, and the other end of which is connected to the lubricating oil chamber in the bearing housing.
8. The lubrication and sealing structure according to claim 7, characterized in that, There are multiple oil passages, which are arranged circumferentially around the preset axis.
9. A spindle mating structure, characterized in that, include: Bearing housing; The main shaft is rotatably connected to the bearing housing; The lubrication sealing structure according to any one of claims 1 to 8, wherein the end cap of the lubrication sealing structure is connected to the end face of the bearing housing.
10. A wind turbine generator, characterized in that, Includes the spindle mating structure as described in claim 9.