Oil-leakage-proof heat dissipation structure of double-fed asynchronous wind driven generator bearing
By combining labyrinth rings and grooved oil baffles in a doubly-fed asynchronous wind turbine, the problems of bearing oil leakage and heat dissipation are solved, enhancing sealing and lubrication and ensuring stable operation of the generator.
Patent Information
- Application Number
- CN202423068076.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-12
AI Technical Summary
The bearings of existing doubly-fed asynchronous wind turbines are prone to oil leakage, leading to poor lubrication, wear, and vibration, which affects the normal operation of the generator.
The static and dynamic sealing structure combines a labyrinth ring and a grooved oil retainer ring. The labyrinth ring is machined on the inner cover of the bearing, and the oil retainer ring is assembled on the rotating shaft. The grooves force the grease back into the bearing chamber as the shaft rotates, enhancing the sealing and lubrication effect.
It effectively prevents bearing oil leakage, improves lubrication, enhances heat dissipation, reduces failure rate, and ensures stable operation of the generator.
Smart Images
Figure CN223447500U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of doubly-fed asynchronous wind driven generators, especially to a bearing oil leakage prevention and heat dissipation structure of doubly-fed asynchronous wind driven generators. BACKGROUND
[0002] Bearing failure accounts for a large proportion of failures during the operation of wind driven generators, wherein bearing oil leakage not only pollutes the inside of the generator but also causes poor bearing lubrication, resulting in bearing dry abrasion and damage, and further causing the vibration of the generator to become larger, and even adversely affecting the whole machine. The root cause of bearing oil leakage is that the bearing inner cover and the rotating shaft are not sealed in place. The bearing inner cover is a fixed component, the rotating shaft is a rotating component, and they rotate together with the rotor. They are gap-fitted. If the gap is too large, it is easy to cause oil leakage. If the gap is too small, it is easy to cause the rotating shaft and the bearing inner cover to rub, causing damage to the rotating shaft. In summary, bearing oil leakage accelerates the damage to the bearing, causing the generator to vibrate, burn out, etc., and seriously affecting the normal operation of the generator.
[0003] In order to prevent bearing oil leakage, the current doubly-fed asynchronous wind driven generators usually adopt oil seals, labyrinths, or labyrinth grooves, etc. This sealing all belongs to static sealing. The labyrinth structure is to add one to three labyrinths on the inner cover. When the oil flows from the gap between the rotating shaft to the labyrinth of the inner cover, the labyrinth plays a role in increasing resistance, thereby achieving the purpose of preventing oil leakage. The labyrinth groove is to wash out multiple small grooves on the rotating shaft, and the effect and principle are the same as the labyrinth structure. The oil seal is to wash out a small groove on the rotating shaft, which is filled with special material to increase the resistance of the oil flowing outward, thereby achieving the purpose of preventing oil leakage. The operation cycle of the generator is generally 20-25 years. During the entire operation cycle, static sealing cannot completely prevent the bearing inner cover from leaking oil, resulting in poor lubrication of the bearing due to oil shortage, and ultimately damaging the normal operation of the bearing and polluting the inside of the generator. UTILITY MODEL CONTENTS
[0004] The utility model aims at overcoming the shortcomings and deficiencies of the prior art, and provides a doubly-fed asynchronous wind driven generator bearing oil leakage prevention and heat dissipation structure which is simple and reliable in structure, can prevent bearing oil leakage, and can strengthen bearing heat dissipation.
[0005] In order to achieve the above-mentioned purpose, the technical scheme provided by the utility model is as follows: a doubly-fed asynchronous wind driven generator bearing oil leakage prevention and heat dissipation structure, comprising a labyrinth ring and an oil retaining ring, wherein the labyrinth ring is machined on the bearing inner cover, the oil retaining ring is assembled on the rotating shaft of the wind driven generator and is embedded into the oil retaining ring mounting position on the bearing inner cover, and it is interference-fitted with the bearing inner cover, a plurality of grooves are formed on the ring body of the oil retaining ring and are uniformly distributed along the circumference thereof, the grooves rotate with the rotating shaft, and are used in cooperation with the labyrinth ring to force the oil flowing outward from the gap between the rotating shaft and the labyrinth ring back into the bearing chamber, thereby achieving the effects of sealing, lubrication, and heat dissipation.
[0006] Preferably, the groove runs through both sides of the oil baffle ring.
[0007] Preferably, the groove is arranged obliquely.
[0008] Preferably, the labyrinth ring is a three-labyrinth ring.
[0009] Preferably, the bearing inner cover and the bearing are in interference fit.
[0010] Preferably, the bearing is hot-mounted on the rotating shaft.
[0011] Preferably, the bearing inner cover is a cast iron piece.
[0012] Preferably, the oil baffle ring is a Q235 material piece.
[0013] Preferably, the rotating shaft is a 35CrMo material piece or a 40Cr material piece.
[0014] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0015] When the oil flows out from the gap between the rotating shaft and the labyrinth ring, the groove on the oil baffle ring rotates with the rotating shaft to force the oil back into the bearing chamber, thereby achieving the sealing effect, and the inner resistance is increased, so that the oil flowing back to the bearing can strengthen the lubrication of the bearing, thereby better heat dissipation and reducing the failure rate of the bearing. In summary, the utility model is aimed at the doubly-fed asynchronous wind driven generator, and the existing bearing unit is optimized, the problems of bearing oil leakage and heat dissipation of the generator in the whole life cycle can be effectively solved, the advanced static sealing and dynamic sealing are combined (i.e. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The cross-sectional view of the double-fed asynchronous wind driven generator bearing oil leakage prevention and heat dissipation structure provided in the embodiment.
[0017] Figure 2 The cooperation schematic view of the bearing inner cover and the oil baffle ring.
[0018] Figure 3 The exploded view of Figure 2 The structure schematic view of the oil baffle ring.
[0019] Figure 4 The structure schematic view of the oil baffle ring. DETAILED DESCRIPTION
[0020] The utility model will be described further in detail in combination with the embodiment and the drawings, but the embodiment of the utility model is not limited thereto.
[0021] like Figures 1 to 4 As shown, this embodiment discloses a doubly fed asynchronous wind turbine bearing oil leakage prevention and heat dissipation structure, comprising three labyrinth rings 1 and an oil retaining ring 2, wherein the three labyrinth rings 1 are processed on the bearing inner cover 3, which can increase the resistance to grease outflow and, to a certain extent, prevent oil leakage of the bearing 4. The oil retaining ring 2 is assembled on the rotating shaft 5 of the wind turbine and embedded in the oil retaining ring mounting position on the bearing inner cover 3. It has an interference fit with the bearing inner cover 3. The ring body of the oil retaining ring 2 is provided with a plurality of grooves 6 evenly distributed along its circumference. The grooves 6 are arranged at an angle and pass through the two sides of the oil retaining ring 2. The grooves 6 rotate with the rotating shaft 5 and are used in conjunction with the three labyrinth rings 1. When grease flows out from the gap between the rotating shaft 5 and the three labyrinth rings 1, the grooves 6 on the oil retaining ring 2 rotate with the rotating shaft 5 to force the grease back to the bearing chamber, thereby achieving a sealing effect, and the inner resistance is increased. When the grease flows back to the bearing 4, it will enhance lubrication of the bearing 4, thereby better dissipating heat and reducing the failure rate of the bearing 4.
[0022] Specifically, the bearing 4 is shrink-fitted onto the rotating shaft 5 , and the bearing inner cover 3 and the bearing 4 are in interference fit.
[0023] Specifically, the bearing 4 includes an inner ring, an outer ring, a cage and balls, and is generally made of bearing steel material. It is used to support the rotation of the rotor and requires grease lubrication during operation.
[0024] Specifically, the bearing inner cover 3 is made of cast iron material and forms a bearing unit together with the bearing 4. The material has good corrosion resistance and high mechanical strength at high temperatures.
[0025] Specifically, the oil slinger ring 2 is made of Q235 material, which has high toughness, fatigue resistance and impact resistance.
[0026] Specifically, the rotating shaft 5 is made of materials such as 35CrMo or 40Cr, and the bearing 4 , the bearing inner cover 3 and the oil deflector 2 are all fixed on the rotating shaft 5 .
[0027] To sum up, the utility model is aimed at the doubly fed asynchronous wind turbine. By optimizing the existing bearing unit, it can effectively solve the problems of bearing oil leakage and heat dissipation throughout the life cycle of the generator. It adopts a combination of advanced static seals and dynamic seals (i.e., a labyrinth ring and an oil retaining ring with grooves) to increase the reliability of the seal, better prevent bearing oil leakage and enhance the good heat dissipation of the bearing, ensure the stability of the structure, and enable the wind turbine to operate safely and reliably. It has practical application value and is worthy of promotion.
[0028] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in 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 double-fed asynchronous wind turbine bearing anti-leakage oil heat dissipation structure, characterized in that: It includes a labyrinth ring and an oil deflector ring, wherein the labyrinth ring is processed on the bearing inner cover, the oil deflector ring is assembled on the rotating shaft of the wind turbine, and embedded in the oil deflector ring installation position on the bearing inner cover, and there is an interference fit between it and the bearing inner cover. The ring body of the oil deflector ring is provided with a plurality of grooves evenly distributed along its circumference. The grooves rotate with the rotating shaft and are used in conjunction with the labyrinth ring to force the grease flowing out from the gap between the rotating shaft and the labyrinth ring back to the bearing chamber, thereby achieving the effect of sealing and lubricating and heat dissipation.
2. The anti-oil-leakage heat dissipation structure for bearings of a doubly-fed asynchronous wind turbine generator according to claim 1, characterized in that: The groove passes through both side surfaces of the oil deflector ring.
3. The anti-oil-leakage heat dissipation structure for bearings of a doubly-fed asynchronous wind turbine generator according to claim 2, characterized in that: The groove is arranged obliquely.
4. The anti-oil-leakage heat dissipation structure for bearings of a doubly-fed asynchronous wind turbine generator according to claim 1, characterized in that: The maze rings are three maze rings.
5. The anti-oil-leakage heat dissipation structure for bearings of a doubly-fed asynchronous wind turbine generator according to claim 1, characterized in that: The bearing inner cover and the bearing are in interference fit.
6. The anti-oil-leakage heat dissipation structure for bearings of a doubly-fed asynchronous wind turbine generator according to claim 1, characterized in that: The bearing is shrink-fitted onto the rotating shaft.
7. The anti-oil-leakage heat dissipation structure for bearings of a doubly-fed asynchronous wind turbine generator according to claim 1, characterized in that: The bearing inner cover is a cast iron part.
8. The anti-oil-leakage heat dissipation structure for bearings of a doubly-fed asynchronous wind turbine generator according to claim 1, characterized in that: The oil retaining ring is made of Q235 material.
9. The anti-oil-leakage heat dissipation structure for bearings of a doubly-fed asynchronous wind turbine generator according to claim 1, characterized in that: The rotating shaft is made of 35CrMo material or 40Cr material.