A sealing system for a main bearing of a wind turbine generator and a wind turbine generator

Abstract

The utility model discloses a sealing system for a main bearing of a wind turbine generator and a wind turbine generator, comprising a sealing base and a sleeve, wherein the sleeve is sleeved on the main shaft of the wind turbine generator, relatively stationary with the main shaft, and moves with the main shaft, wherein the sealing base is sleeved on the outer side of the sleeve and fixed on the bearing seat end cover of the wind turbine generator, and is in a stationary state, wherein a flexible sealing structure and a labyrinth sealing structure are respectively arranged between the sealing base and the sleeve, and the flexible sealing structure is located on a side close to the oil side of the sealing system, and the labyrinth sealing structure is located on a side close to the outside of the sealing system. The utility model can effectively solve the difficulties of bearing seal failure, maintenance difficulty and high cost, thereby achieving the purpose of maintenance-free and long life.

Description

Technical Field

[0001] The utility model relates to the technical field of wind generator main bearing seals, in particular to a sealing system for a wind generator main bearing and a wind generator. Background Art

[0002] In wind power generation equipment, bearings are important components of the transmission chain system. With the large-scale and fully integrated design of the unit, the transmission chain system adopts the main shaft system and the gearbox integrated into one, sharing a lubrication system, generally using oil lubrication, and the current mainstream main bearing seal design mostly adopts a labyrinth seal or a labyrinth plus rubber seal structure; on the one hand, the labyrinth structure designed on the bearing seat end cover causes the end cover to be large in size, heavy in volume, with small maintenance space and difficult maintenance; on the other hand, if leakage occurs, it is easy to cause environmental pollution, waste of oil, and possible fire problems, which brings great risks and safety hazards, and maintenance requires a lot of manpower and material resources, and the cost is high.

[0003] The rear end of the main shaft system of the integrated transmission chain is integrated with the gear box, and the sealing is simple and reliable. However, the front end is affected by wind load and its own gravity, and there will be a certain deformation. The use of lip seals for pure rotating shafts requires a large interference fit, which will accelerate wear and make it difficult to achieve good compensation and following problems. The use of labyrinth seals requires a relatively large gap with the main shaft to prevent friction and interference due to deformation, so that the labyrinth flow control effect is relatively poor. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a sealing system for the main bearing of a wind turbine generator, which can effectively solve the difficulties of bearing seal failure, maintenance difficulties and high costs, thereby achieving the purpose of maintenance-free and long life.

[0005] Another object of the utility model is to provide a wind turbine.

[0006] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0007] A sealing system for a main bearing of a wind turbine generator comprises a sealing base and a sleeve. The sleeve is sleeved on the main shaft of the wind turbine generator, is relatively stationary with the main shaft, and moves with the main shaft. The sealing base is sleeved on the outer side of the sleeve and is fixed on the end cover of the bearing seat of the wind turbine generator and is in a stationary state. A flexible sealing structure and a labyrinth sealing structure are respectively arranged between the sealing base and the sleeve, and the flexible sealing structure is located on the side close to the oil-proximal side of the sealing system, and the labyrinth sealing structure is located on the side close to the outside of the sealing system.

[0008] Furthermore, the flexible sealing structure includes a flexible seal arranged between the sealing base and the sleeve, and a flexible structure is arranged on the flexible seal between the sealing body and the sealing lip, and the lip of the sealing lip follows and compensates with the sleeve through the flexible structure.

[0009] Furthermore, the lip of the sealing lip of the flexible sealing element is in contact with or not in contact with the shaft sleeve.

[0010] Furthermore, a boss structure is provided at the lowest end of the outer circumferential surface of the sealing base, and a plurality of first oil return holes are provided on the boss structure. An oil storage tank is provided inside the sealing base, and the oil storage tank is connected to the oil return pipeline and the external oil tank through the first oil return holes to realize the oil return function. The labyrinth sealing structure is provided on the inner circumferential surface of the sealing base and is located next to the oil storage tank. The labyrinth sealing structure is composed of a plurality of first bosses and grooves provided between the two first bosses, and a plurality of second oil return holes are processed on the first boss closest to the oil storage tank, and the oil in the grooves is returned to the oil storage tank through the second oil return holes.

[0011] Furthermore, a mounting groove for mounting the flexible sealing structure is provided on the sealing base and located on the other side of the oil storage tank.

[0012] Furthermore, the sealing substrate is a metal part or a plastic part.

[0013] Furthermore, the labyrinth sealing structure has at least one layer.

[0014] Furthermore, a second boss is provided on the outer circumferential surface of the shaft sleeve at a position corresponding to the groove of the labyrinth seal structure, and a labyrinth seal is formed by the cooperation between the second boss and the labyrinth seal structure.

[0015] Another purpose of the utility model can be achieved by adopting the following technical solutions:

[0016] A wind turbine generator comprises the above sealing system for the main bearing of the wind turbine generator.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] The sealing system of the utility model has a flexible sealing structure, which can compensate for the deviation caused by the deformation of the main shaft, maintain the sealing effect under extreme working conditions, and prevent large-scale oil leakage. At the same time, a labyrinth seal is formed through the shaft sleeve boss and the sealing base to play a flow blocking and oil return effect, thereby achieving the purpose of maintenance-free and long life, and solving the problem of high cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the sealing system of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the flexible sealing member of the utility model.

[0021] Figure 3 It is a front view of the sealing substrate of the utility model.

[0022] Figure 4 for Figure 3 Middle AA section view.

[0023] Figure 5 for Figure 4 A partial enlarged view of point C in the middle.

[0024] Figure 6 for Figure 3 Middle BB section view.

[0025] Figure 7 for Figure 6 A partial enlarged view of point E in the middle.

[0026] Figure 8 for Figure 6 Middle DD section view.

[0027] Fig. 9 for Figure 8 A partial enlarged view of point F in the middle. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] Embodiment 1:

[0030] like Figure 1 As shown, this embodiment provides a sealing system for the main bearing of a wind turbine generator, including a sealing base 1 and a sleeve 2. The sleeve 2 is mounted on the main shaft of the wind turbine generator, is relatively stationary with the main shaft, and moves with the main shaft. The sealing base 1 is mounted on the outer side of the sleeve 2 and is fixed on the end cover of the bearing seat of the wind turbine generator and is in a stationary state. A flexible sealing structure and a labyrinth sealing structure are respectively arranged between the sealing base 1 and the sleeve 2, and the flexible sealing structure is located on the side close to the oil-proximal side of the sealing system, and the labyrinth sealing structure is located on the side close to the outside of the sealing system. The flexible sealing structure is a main seal with compensation and following capabilities, and can effectively compensate for deformation or eccentricity problems caused by the shaft system. The labyrinth sealing structure is used to drain the return oil to achieve the purpose of flow blocking and throttling, and one or more channels can be set according to actual sealing requirements.

[0031] like Figure 2 As shown, the flexible sealing structure includes a flexible seal 3 disposed between a sealing base 1 and a shaft sleeve 2, and a flexible structure 301 is disposed on the flexible seal 3 between its seal body and a sealing lip 302, and the lip of the sealing lip is used to follow and compensate the shaft sleeve, thereby solving the problem that the main shaft cannot be compensated for the change in size after being deformed by wind load. Furthermore, the lip of the sealing lip 302 of the flexible seal may contact or not contact the shaft sleeve 2.

[0032] like Figures 3 to 9 As shown, a boss structure 101 is provided at the lowest end of the outer peripheral surface of the sealing base 1, and a plurality of first oil return holes 102 are provided on the boss structure 101, preferably three are provided. An oil storage tank 103 is provided inside the sealing base 1, and the oil storage tank 103 is connected to the oil return pipeline and the external oil tank through the first oil return hole 102, so as to store and return oil. A labyrinth sealing structure is provided on the inner peripheral surface of the sealing base 1 and is located next to the oil storage tank 103. The labyrinth sealing structure is composed of a plurality of first bosses 104 and grooves 105 provided between the first bosses 104 in pairs, and a plurality of second oil return holes 106 are processed on the first boss 104 closest to the oil storage tank 103, and the oil in the groove 105 is returned to the oil storage tank 103 through the second oil return holes 106.

[0033] Furthermore, a mounting groove 107 for mounting the flexible sealing structure is provided on the sealing base 1 and located on the other side of the oil storage tank 103. The sealing base 1 can be made of metal material or plastic material. It can be an integral structure or a split structure. When the split structure is adopted, the sealing base is treated with a special sealant to facilitate sealing at the split position.

[0034] Specifically, a second boss 201 is provided on the outer circumferential surface of the sleeve 2 and at a position corresponding to the groove 105 of the labyrinth sealing structure. A labyrinth seal is formed by the second boss 201 and the labyrinth sealing structure. At the same time, the second boss 201 moves together with the main shaft to form an oil ring, which has the effects of oil throwing, flow resistance and throttling.

[0035] Embodiment 2:

[0036] This embodiment provides a wind turbine generator, including the sealing system for the main bearing of the wind turbine generator described in Embodiment 1.

[0037] The above is only a preferred embodiment of the utility model patent, but the protection scope of the utility model patent is not limited to this. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the utility model patent according to the technical solution of the utility model patent and its utility model patent concept, which are all within the protection scope of the utility model patent.

Claims

1. A sealing system for a main bearing of a wind turbine generator, characterized in that: It includes a sealing base and a sleeve. The sleeve is sleeved on the main shaft of the wind turbine generator, is relatively stationary with the main shaft, and moves with the main shaft. The sealing base is sleeved on the outer side of the sleeve and is fixed on the end cover of the bearing seat of the wind turbine generator and is in a stationary state. A flexible sealing structure and a labyrinth sealing structure are respectively arranged between the sealing base and the sleeve, and the flexible sealing structure is located on the side close to the oil-proximal side of the sealing system, and the labyrinth sealing structure is located on the side close to the outside of the sealing system.

2. The sealing system for the main bearing of a wind turbine generator according to claim 1, characterized in that: The flexible sealing structure comprises a flexible sealing member arranged between a sealing base and a shaft sleeve, wherein a flexible structure is arranged between the sealing member body and the sealing lip of the flexible sealing member, and the lip of the sealing lip follows and compensates the shaft sleeve through the flexible structure.

3. The sealing system for the main bearing of a wind turbine generator according to claim 2, characterized in that: The lip of the sealing lip of the flexible sealing element is in contact with the shaft sleeve or not in contact with the shaft sleeve.

4. The sealing system for a main bearing of a wind turbine generator according to claim 1, characterized in that: A boss structure is provided at the lowest end of the outer circumferential surface of the sealing base, and a plurality of first oil return holes are provided on the boss structure. An oil storage tank is provided inside the sealing base, and the oil storage tank is connected to the oil return pipeline and the external oil tank through the first oil return hole to realize the oil return function. The labyrinth sealing structure is provided on the inner circumferential surface of the sealing base and is located next to the oil storage tank. The labyrinth sealing structure is composed of a plurality of first bosses and grooves provided between the two first bosses, and a plurality of second oil return holes are processed on the first boss closest to the oil storage tank, and the oil in the grooves is returned to the oil storage tank through the second oil return holes.

5. The sealing system for the main bearing of a wind turbine generator according to claim 4, characterized in that: An installation groove for installing a flexible sealing structure is arranged on the sealing base and located on the other side of the oil storage tank.

6. The sealing system for the main bearing of a wind turbine generator according to claim 4, characterized in that: The sealing substrate is a metal part or a plastic part.

7. The sealing system for a main bearing of a wind turbine generator according to claim 4, characterized in that: The labyrinth sealing structure has at least one layer.

8. The sealing system for a main bearing of a wind turbine generator according to claim 1, characterized in that: A second boss is arranged on the outer peripheral surface of the shaft sleeve at a position corresponding to the groove of the labyrinth seal structure, and a labyrinth seal is formed by the cooperation between the second boss and the labyrinth seal structure.

9. A wind turbine generator, characterized in that: A sealing system for a main bearing of a wind turbine generator comprising the sealing system according to any one of claims 1 to 8.

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