Main shaft sealing structure

Abstract

The invention provides a main shaft sealing structure, and relates to the technical field of wind power generation. The main shaft sealing structure comprises a bearing seat, a main shaft and a bearing, the main shaft penetrates through the bearing seat, the bearing is matched with the bearing seat and the main shaft at the same time, a flexible sealing piece is annularly arranged on the main shaft and fixedly connected with the bearing seat, and oil blocking teeth are arranged on the surface, facing the outer side wall of the main shaft, of the flexible sealing piece. The main shaft sealing structure can improve the sealing effect between the main shaft and the bearing seat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generation, in particular to a main shaft sealing structure. BACKGROUND

[0002] As a clean energy technology, wind power generation has been widely applied and developed in the world in recent years. In a wind turbine, the main shaft bearing plays an important role in transmitting torque and supporting rotation. In order to ensure the long-term stable operation of the main shaft bearing, the existing technology generally uses an oil lubrication system to lubricate the main shaft bearing.

[0003] In the existing wind turbine, the sealing effect between the main shaft and the bearing seat is not good, which leads to oil leakage from the gap between the main shaft and the bearing seat. This leakage not only causes oil loss of the lubrication system, but also may contaminate other components inside the unit, affecting the normal operation of the equipment. SUMMARY

[0004] The purpose of the present application includes, for example, providing a main shaft sealing structure which can improve the sealing effect between the main shaft and the bearing seat.

[0005] Embodiments of the present application can be implemented as follows: The embodiments of the present application provide a main shaft sealing structure, which comprises a bearing seat, a main shaft and a bearing, the main shaft is arranged in the bearing seat, the bearing cooperates with the bearing seat and the main shaft, a flexible sealing member is arranged around the main shaft, the flexible sealing member is fixedly connected with the bearing seat, and an oil blocking tooth is arranged on the surface of the outer side wall of the main shaft facing the flexible sealing member.

[0006] Optionally, the number of oil blocking teeth is multiple, and the multiple oil blocking teeth are arranged along the axial direction of the main shaft.

[0007] Optionally, grease is filled between two adjacent oil blocking teeth.

[0008] Optionally, a clamp is arranged on the flexible sealing member.

[0009] Optionally, a dustproof tooth is arranged on the surface of the outer side wall of the main shaft facing the flexible sealing member, and the dustproof tooth is located on one side of the oil blocking tooth.

[0010] Optionally, the main shaft sealing structure further comprises a pressing plate and a fastener, the fastener is arranged in the pressing plate, the flexible sealing member and the bearing seat in sequence, and is fixedly connected with the bearing seat.

[0011] Optionally, a matching member is arranged on the main shaft, part of the matching member extends out of the bearing seat, and the flexible sealing member is arranged around the part of the matching member extending out of the bearing seat.

[0012] Optionally, the part of the fitting element located in the bearing seat is protruded with a stop edge towards the inner wall of the bearing seat.

[0013] Optionally, the part of the fitting element located in the bearing seat is provided with a stepped surface, and the stop edge is arranged on the stepped surface at different heights.

[0014] Optionally, the fitting element is in interference fit with the main shaft.

[0015] The main shaft sealing structure provided by the embodiments of the present application has the following beneficial effects, for example: in order to improve the sealing effect between the main shaft and the bearing seat, a main shaft sealing structure is designed, which comprises a bearing seat, a main shaft and a bearing. The main shaft is arranged in the bearing seat, and the bearing is in cooperation with the bearing seat and the main shaft. A flexible sealing element is arranged around the main shaft. The flexible sealing element is fixedly connected with the bearing seat, and the flexible sealing element is provided with an oil blocking tooth towards the surface of the outer side wall of the main shaft.

[0016] By arranging the flexible sealing element around the main shaft, the oil blocking tooth on the flexible sealing element increases the resistance of the lubricating oil flowing from the inside to the outside without causing friction and wear. If the lubricating oil has a tendency to leak outward, the oil blocking tooth can effectively block the oil flow path and reduce the risk of leakage. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 It is a whole schematic view of the main shaft sealing structure in the embodiments of the present application. Figure 2 It is a partial view of the main shaft sealing structure in the embodiments of the present application. Figure 1 It is an enlarged view of part A. Figure 3 It is a partial sectional view of the main shaft sealing structure in the embodiments of the present application.

[0019] Figure legend: 100-bearing seat; 200-main shaft; 300-flexible sealing element; 310-oil blocking tooth; 320-dust tooth; 330-clamp; 400-pressing plate; 500-fastener; 600-fitting element; 610-stop edge; 620-stepped surface. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0022] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0023] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0024] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0026] Please refer to Figures 1-3 The embodiments of the present application provide a main shaft sealing structure, which comprises a bearing seat 100, a main shaft 200 and a bearing, the main shaft 200 is arranged in the bearing seat 100, the bearing cooperates with the bearing seat 100 and the main shaft 200, a flexible sealing piece 300 is arranged on the main shaft 200, the flexible sealing piece 300 is fixedly connected with the bearing seat 100, and the surface of the outer side wall of the flexible sealing piece 300 facing the main shaft 200 is provided with an oil blocking tooth 310.

[0027] The bearing cooperates with both the bearing housing 100 and the main shaft 200 to provide support and rotation for the main shaft 200. A flexible seal 300 is ring-shaped around the main shaft 200, and this flexible seal 300 is fixedly connected to the bearing housing 100 to maintain spatial stability. The surface of the flexible seal 300 facing the outer wall of the main shaft 200 has oil-blocking teeth 310, which extend radially along the main shaft 200 and closely adhere to it, forming a reliable sealing structure.

[0028] The oil-blocking teeth 310 on the flexible seal 300 increase the resistance to the flow of lubricating oil from the inside to the outside without causing frictional wear. In practical applications, when lubricating oil attempts to leak outward as the spindle 200 rotates, the oil-blocking teeth 310 can effectively block the oil flow path and reduce the risk of leakage.

[0029] Optionally, the flexible seal 300 may be made of hydrogenated nitrile rubber, fluororubber, silicone rubber, polytetrafluoroethylene or composite materials thereof, without limitation.

[0030] In an optional embodiment, there are multiple oil-blocking teeth 310, which are arranged along the axial direction of the main shaft 200.

[0031] There are multiple oil-blocking teeth 310, which are arranged along the axial direction of the main shaft 200 to form a multi-stage sealing structure with staggered front and rear. It can be understood that by setting multiple oil-blocking teeth 310 distributed along the axial direction, a continuous multi-stage sealing structure is constructed between the flexible seal 300 and the main shaft 200.

[0032] When lubricating oil migrates from the inside of the bearing housing 100 outwards, it is blocked by a series of oil-blocking teeth 310. Each time it passes through an oil-blocking tooth 310, the oil flow pressure is gradually weakened. It can be seen that this arrangement of multi-stage oil-blocking teeth 310 can significantly extend the leakage path, enhance the throttling effect, and thus effectively suppress the axial leakage of lubricating oil and improve the overall sealing performance.

[0033] In an optional embodiment, grease is filled between two adjacent oil-blocking teeth 310.

[0034] The grease is held within an annular space formed by multiple oil-blocking teeth 310. This can be understood as filling the gaps between adjacent oil-blocking teeth 310 with grease, utilizing its viscous properties to further seal any potential leakage channels.

[0035] It should be noted that the lubricating grease as a static sealing medium can effectively block the migration of lubricating oil from the inside of the bearing seat 100 to the outside, preventing it from continuously flowing along the gap between the oil blocking teeth 310. At the same time, the lubricating grease itself is not easy to volatilize and has low flowability, and can maintain the sealing barrier function for a long time. As can be seen, the lubricating grease and the oil blocking teeth 310 work together to improve the long-term reliability of the main shaft sealing structure.

[0036] In an optional embodiment, a flexible sealing piece 300 is sleeved with a clamp 330.

[0037] It should be noted that the degree of compression between the flexible sealing piece 300 and the main shaft 200 directly affects the sealing effect. Specifically, the clamp 330 is arranged around the outside of the flexible sealing piece 300. It can be understood that, by arranging the clamp 330 on the flexible sealing piece 300, the clamp 330 exerts uniform inward compression on the flexible sealing piece 300 by using the radial contraction force.

[0038] The clamp 330 can adjust the degree of tightness to drive the flexible sealing piece 300 to produce elastic deformation, thereby adjusting the pressing force between the oil blocking teeth 310 of the outer wall of the main shaft 200 and the main shaft 200. When the clamp 330 is locked, the flexible sealing piece 300 is deformed under pressure, so that the oil blocking teeth 310 are more closely attached to the surface of the main shaft 200, the sealing contact pressure is increased, and the leakage gap is reduced.

[0039] In an optional embodiment, the surface of the flexible sealing piece 300 towards the outer wall of the main shaft 200 is provided with dust teeth 320, and the dust teeth 320 are located on one side of the oil blocking teeth 310.

[0040] It should be noted that dust and other pollutants in the external environment of the bearing seat 100 may enter the inside along the main shaft 200, affecting the lubrication effect and the service life of the bearing. Specifically, the dust teeth 320 are located on one side of the oil blocking teeth 310 and arranged at one end of the main shaft 200 close to the external environment.

[0041] By arranging the dust teeth 320 on the flexible sealing piece 300, the dust teeth 320 are close to the surface of the main shaft 200, limiting the entry of external particulate matter into the bearing seat 100 along the axial direction, and can block the invasion of dust, sand and other pollutants.

[0042] In an optional embodiment, the main shaft sealing structure further comprises a pressing plate 400 and a fastener 500, the fastener 500 is sequentially arranged through the pressing plate 400, the flexible sealing piece 300 and the bearing seat 100, and is fixedly connected with the bearing seat 100.

[0043] It should be understood that the flexible sealing piece 300 needs to maintain a stable position and posture during operation to ensure the continuous and effective sealing function.

[0044] Fastener 500 can be a bolt. Through the cooperation of pressure plate 400 and bolt, flexible seal 300 is firmly fixed to bearing housing 100. In this process, after the bolt passes through pressure plate 400 and flexible seal 300, it is screwed into the threaded hole of bearing housing 100. As the bolt is tightened, pressure plate 400 applies axial clamping force to flexible seal 300 to prevent it from loosening or displacing under vibration or thermal expansion and contraction, thereby ensuring sealing performance.

[0045] In an optional embodiment, a mating member 600 is fitted onto the spindle 200, a portion of which extends outside the bearing housing 100, and a flexible seal 300 is circumferentially disposed around the portion of the mating member 600 that extends outside the bearing housing 100.

[0046] It should be noted that the surface of the spindle 200 may wear or become uneven due to long-term rotation, which directly affects the sealing effect. Therefore, the flexible seal 300 is arranged around the part of the mating part 600 that extends to the outside of the bearing housing 100.

[0047] By adding a mating component 600 to the outside of the spindle 200, a stable and smooth sealing mating surface is provided for the flexible seal 300. During this process, the flexible seal 300 is fixed to the bearing housing 100 and surrounds the exposed section of the mating component 600. The oil-blocking teeth 310 and dust-proof teeth 320 on the flexible seal 300 respectively form sealing interfaces with the outer wall of the mating component 600. This structure not only avoids direct contact between the flexible seal 300 and the spindle 200, preventing wear, but also facilitates individual replacement of the seal or mating component 600 when damaged, reducing maintenance costs.

[0048] In an optional embodiment, the portion of the mating member 600 located within the bearing housing 100 has a flange 610 protruding toward the inner wall of the bearing housing 100.

[0049] By providing a flange 610 extending toward the inner wall of the bearing housing 100 on the mating part 600, a physical barrier structure is formed between the mating part 600 and the bearing housing 100. During this process, when lubricating oil flows axially from the inside, the flange 610 can change the oil flow direction, increasing the resistance to outward flow of the oil. Simultaneously, the minute gap between the flange 610 and the inner wall of the bearing housing 100 creates a throttling effect, effectively suppressing continuous oil leakage.

[0050] Furthermore, the portion of the mating part 600 located within the bearing housing 100 is provided with a stepped surface 620, and the stepped surface 620 is provided with a retaining edge 610 on planes at different heights.

[0051] The stepped surface 620 of the fitting part 600 is provided with the retaining edge 610 on the planes of different heights, forming a multi-stage stepped structure. It can be understood that, by arranging the retaining edge 610 at each step of the stepped surface 620, a plurality of staggered sealing barriers are constructed between the fitting part 600 and the bearing seat 100. In this process, the lubricating oil needs to repeatedly pass through the narrow gap between the retaining edge 610 and the inner wall of the bearing seat 100 when moving in the axial direction. Each retaining edge 610 plays a role of throttling and changing the flow direction, significantly prolonging the leakage path and consuming the kinetic energy of the oil.

[0052] Optionally, the fitting part 600 is in interference fit with the main shaft 200.

[0053] It should be noted that if there is a gap between the fitting part 600 and the main shaft 200, the lubricating oil may leak along the interface between them. It can be understood that the interference fit between the fitting part 600 and the main shaft 200 forms a highly tight mechanical combination, eliminating the gap between them. The tight contact interface between the fitting part 600 and the main shaft 200 effectively blocks the path of the lubricating oil penetrating from the inside to the outside along the main shaft 200 in the axial direction, preventing the oil from spreading outward from between the fitting part 600 and the main shaft 200.

[0054] In summary, the main shaft sealing structure provided by the embodiment of the present application includes a bearing seat 100, a main shaft 200 and a bearing. By the oil retaining teeth 310 on the flexible sealing part 300, the resistance to the flow of lubricating oil from the inside to the outside is increased without generating friction and wear. If the lubricating oil has a tendency to leak outward, the oil retaining teeth 310 can effectively block the oil flow path, reducing the risk of leakage.

[0055] The above merely describes the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed by the present application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A spindle sealing structure, characterized in that, The device includes a bearing housing, a main shaft, and a bearing. The main shaft passes through the bearing housing, and the bearing engages with both the bearing housing and the main shaft. A flexible seal is provided around the main shaft, and the flexible seal is fixedly connected to the bearing housing. The surface of the flexible seal facing the outer side wall of the main shaft has oil-blocking teeth.

2. The spindle sealing structure according to claim 1, characterized in that, The number of oil-blocking teeth is multiple, and the multiple oil-blocking teeth are arranged along the axial direction of the main shaft.

3. The spindle sealing structure according to claim 2, characterized in that, The space between two adjacent oil-blocking teeth is filled with grease.

4. The spindle sealing structure according to claim 1, characterized in that, The flexible seal is fitted with a clamp.

5. The spindle sealing structure according to claim 1, characterized in that, The flexible seal has dustproof teeth on the outer side wall of the spindle, and the dustproof teeth are located on one side of the oil-blocking teeth.

6. The spindle sealing structure according to claim 1, characterized in that, The spindle sealing structure also includes a pressure plate and fasteners. The fasteners pass through the pressure plate, the flexible seal and the bearing seat in sequence and are fixedly connected to the bearing seat.

7. The spindle sealing structure according to claim 1, characterized in that, A fitting is sleeved on the main shaft, a portion of which extends outside the bearing housing, and a flexible seal is circumferentially disposed on the portion of the fitting that extends outside the bearing housing.

8. The spindle sealing structure according to claim 7, characterized in that, The portion of the mating component located inside the bearing housing has a retaining edge protruding towards the inner wall of the bearing housing.

9. The spindle sealing structure according to claim 8, characterized in that, The portion of the mating component located inside the bearing housing is provided with a stepped surface, and the stepped surface is provided with the retaining edge on planes at different heights.

10. The spindle sealing structure according to claim 7, characterized in that, The mating part is interference-fitted with the spindle.

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