A grease anti-caking structure for main shaft bearing of wind turbine generator set

Abstract

A grease anti-caking structure for the main shaft bearing of a wind turbine generator set includes a front sealing ring, a front cover, a rear sealing ring and a rear cover, the inner ring of the main shaft bearing is fixedly sleeved on the outer surface of the main shaft, and the outer ring of the main shaft bearing is fixedly installed on the bearing seat; the outer surfaces of the front sealing ring and the rear sealing ring are both provided with oil scraper rings, one side of the oil scraper ring is provided with a plurality of oil scraper plates, and the other side of the oil scraper ring is provided with an oil squeeze plate, the outer surfaces of the front cover and the rear cover are respectively provided with a first oil collecting bottle and a second oil collecting bottle, and the front cover and the rear cover are both provided with an oil outlet. The present invention overcomes the shortcomings of the prior art, and the grease inside the main shaft bearing is stirred by the oil scraper plate, thereby ensuring the fluidity of the grease, and when the main shaft rotates and the oil scraper ring rotates, the grease on the outer edge is driven to move outward by the oil squeeze plate, so that the grease gradually accumulates, and then discharged into the first oil collecting bottle and the second oil collecting bottle through the oil outlet.

Description

Technical Field

[0001] The invention relates to the technical field of bearing sealing, and in particular to a grease anti-hardening structure for a main shaft bearing of a wind generator set. Background Art

[0002] At present, the main shaft bearings (thrust bearings and buoyancy bearings) of megawatt-class double-fed wind turbines have poor sealing performance, and oil leakage is a common problem. In addition, pollutants such as dust from the outside will also enter the bearings, affecting the service life of the bearings. Furthermore, the leaked lubricating grease will cause certain pollution to the environment. Moreover, since the main shaft bearings use high-viscosity grease, the grease is difficult to flow automatically, resulting in long-term accumulation inside and thus damaging the bearings. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a structure for preventing grease from hardening in the main shaft bearing of a wind turbine generator set, which overcomes the deficiencies of the prior art and has a reasonable design. The grease inside the main shaft bearing is stirred by the oil scraper plate, thereby ensuring the fluidity of the grease. When the main shaft rotates and the oil scraper ring rotates, the grease on the outer edge is driven outward by the oil squeezing plate, so that the grease gradually accumulates and is then discharged into the first oil collecting bottle and the second oil collecting bottle through the oil outlet.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A grease hardening prevention structure for a main shaft bearing of a wind turbine generator set, comprising a front sealing ring, a front end cover, a rear sealing ring and a rear end cover, wherein the front sealing ring and the rear sealing ring are both fixedly sleeved on the outer surface of the main shaft, the front sealing ring and the rear sealing ring are respectively located on both side surfaces of the main shaft bearing, the inner ring of the main shaft bearing is fixedly sleeved on the outer surface of the main shaft, the outer ring of the main shaft bearing is fixedly installed on the bearing seat, the inner rings of the front end cover and the rear end cover are respectively movably connected with the front sealing ring and the rear sealing ring; the outer surfaces of the front sealing ring and the rear sealing ring are both provided with scrapers An oil ring, a plurality of oil scraping plates are evenly fixedly installed on the side of the oil scraper ring close to the main shaft bearing, an oil squeezing plate is fixedly installed on the side of the oil scraper ring away from the main shaft bearing, a first oil collecting bottle and a second oil collecting bottle are fixedly installed on the outer surfaces of the front end cover and the rear end cover respectively, and an oil outlet is provided on the front end cover and the rear end cover, the oil collecting end of the first oil collecting bottle passes through the oil outlet and is connected with the cavity between the oil scraper ring on the front sealing ring and the front end cover, the second oil collecting bottle passes through the oil outlet and is connected with the cavity between the oil scraper ring on the rear sealing ring and the rear end cover.

[0006] Preferably, a positive thread structure and a negative thread structure are respectively provided on the side of the outer surface of the front sealing ring and the rear sealing ring close to the main shaft bearing, and the thread rotation direction of the positive thread structure and the negative thread structure are both toward the direction of the main shaft bearing.

[0007] Preferably, the cross-section of the oil squeezing plate is a triangular cone.

[0008] Preferably, annular protrusions are provided on the side surfaces of the front sealing ring and the rear sealing ring, and annular grooves are provided below the inner surfaces of the front end cover and the rear end cover, and the annular protrusions match the annular grooves.

[0009] Preferably, the outer surfaces of the front sealing ring and the rear sealing ring are both provided with sealing grooves, and the sealing grooves are fixedly installed with end face seals, and the ends of the end face seals are respectively located at the contact surface between the front sealing ring and the front end cover and at the contact surface between the rear sealing ring and the rear end cover.

[0010] Preferably, the end face seal includes a contact ring and a sealing ring, the contact ring and the sealing ring are of integrated design, the contact ring respectively abuts against the side surfaces of the sealing grooves on the outside of the front sealing ring and the rear sealing ring, and the ends of the sealing ring respectively contact the front cover and the rear cover.

[0011] The present invention provides a grease anti-caking structure for the main shaft bearing of a wind turbine generator set. It has the following beneficial effects: the grease inside the main shaft bearing is stirred by the scraper plate on the side of the scraper ring close to the main shaft bearing, thereby ensuring the fluidity of the grease, and an oil squeeze plate is arranged on the other side of the scraper ring, so that when the main shaft rotates and the scraper ring rotates, the grease on the outer edge is driven outward by the oil squeeze plate, so that it gradually accumulates in the cavity between the scraper ring and the front cover and in the cavity between another scraper ring and the rear cover, and then discharged into the first oil collecting bottle and the second oil collecting bottle through the oil outlet, thereby avoiding environmental pollution caused by grease leakage and ensuring the reuse of grease to avoid waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings required for describing the prior art are briefly introduced below.

[0013] Figure 1 A schematic diagram of the structure of the present invention;

[0014] Figure 2 A schematic plan view of the side of the oil scraper ring close to the main shaft bearing in the present invention;

[0015] Figure 3 A schematic plan view of the side of the oil scraper ring away from the main shaft bearing in the present invention;

[0016] Figure 4 for Figure 1 A partial enlarged view of the middle A;

[0017] Figure 5 A schematic plan view of the end face seal in the present invention;

[0018] Description of the numbers in the figure:

[0019] 1. Front sealing ring; 2. Front end cover; 3. Rear sealing ring; 4. Rear end cover; 5. Main shaft; 6. Main shaft bearing; 7. Oil scraper ring; 8. Oil scraper plate; 9. Oil squeeze plate; 10. First oil collecting bottle; 11. Second oil collecting bottle; 14. Annular bump; 15. Annular groove; 16. End face seal; 161. Resistance ring; 162. Sealing ring; 17. Bearing seat. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0021] Embodiment 1, as Figure 1-3 As shown, a grease anti-hardening structure for the main shaft bearing of a wind turbine generator set includes a front sealing ring 1, a front end cover 2, a rear sealing ring 3 and a rear end cover 4. The front sealing ring 1 and the rear sealing ring 3 are both fixedly sleeved on the outer surface of the main shaft 5. The front sealing ring 1 and the rear sealing ring 3 are respectively located on both side surfaces of the main shaft bearing 6. The inner ring of the main shaft bearing 6 is fixedly sleeved on the outer surface of the main shaft 5. The outer ring of the main shaft bearing 6 is fixedly installed on the bearing seat 17. The inner rings of the front end cover 2 and the rear end cover 4 are movably connected to the front sealing ring 1 and the rear sealing ring 3 respectively; the outer surfaces of the front sealing ring 1 and the rear sealing ring 3 are both provided with oil scraper rings 7, and a plurality of oil scraper plates 8 are evenly fixedly installed on the side of the oil scraper ring 7 close to the main shaft bearing 6. In this embodiment , three oil scraping plates 8 are provided, and are evenly arranged on one side surface of the oil scraper ring 7. A plurality of oil squeezing plates 9 are fixedly installed on the side of the oil scraper ring 7 away from the main shaft bearing 6. In the present embodiment, three oil squeezing plates 9 are provided, and are evenly arranged on the other side surface of the oil scraper ring 7. The outer surfaces of the front end cover 2 and the rear end cover 4 are respectively fixedly installed with a first oil collecting bottle 10 and a second oil collecting bottle 11. The front end cover 2 and the rear end cover 4 are both provided with an oil outlet 18. The oil collecting end of the first oil collecting bottle 10 passes through the oil outlet 18 and is communicated with the cavity between the oil scraper ring 7 on the front sealing ring 1 and the front end cover 2. The second oil collecting bottle 11 passes through the oil outlet 18 and is communicated with the cavity between the oil scraper ring 7 on the rear sealing ring 3 and the rear end cover 4.

[0022] Working principle: when the main shaft 5 rotates and drives the front sealing ring 1 and the rear sealing ring 3 to rotate together, since the outer surfaces of the front sealing ring 1 and the rear sealing ring 3 are provided with oil scraper rings 7, the oil scraper plate 8 on the side of the oil scraper ring 7 close to the main shaft bearing 6 drives the grease inside the main shaft bearing 6 to be stirred, thereby ensuring the fluidity of the grease, and by arranging an oil squeezing plate 9 on the other side of the oil scraper ring 7, when the main shaft 5 rotates and the oil scraper ring 7 rotates, the grease on the outer edge is driven outward by the oil squeezing plate 9. In this embodiment, the cross-section of the oil squeezing plate 9 can be set to a triangular cone to guide the grease, so that it gradually accumulates in the cavity between the oil scraper ring 7 and the front end cover 2 and in the cavity between the other oil scraper ring 7 and the rear end cover 4, and then discharged into the first oil collecting bottle 10 and the second oil collecting bottle 11 through the oil outlet 18, thereby avoiding environmental pollution caused by grease leakage and ensuring the reuse of grease to avoid waste of resources.

[0023] Embodiment 2 is a further improvement based on embodiment 1. A positive thread structure and a negative thread structure are respectively provided on the side of the outer surface of the front sealing ring 1 and the rear sealing ring 3 close to the main shaft bearing 6. The thread rotation direction of the positive thread structure and the negative thread structure is both toward the direction of the main shaft bearing 6. Therefore, when the main shaft 5 rotates, the front sealing ring 1 and the rear sealing ring 3 are driven to rotate. The guiding effect of the thread structure can drive the internal grease to flow toward the direction of the main shaft bearing 6, so that the grease can enter the inside of the main shaft bearing 6 to lubricate the main shaft bearing 6, and further reduce the leakage of grease to the outside, forming a rotary seal.

[0024] Embodiment three, as Figure 4 As shown, based on the further improvement of the first embodiment, an annular protrusion 14 is provided on the side surface of the front sealing ring 1 and the rear sealing ring 3, and an annular groove 15 is provided below the inner surface of the front end cover 2 and the rear end cover 4, and the annular protrusion 14 matches the annular groove 15. By providing the annular protrusion 14 and the annular groove 15, a labyrinth structure is formed between the front sealing ring 1 and the front end cover 2, and between the rear sealing ring 3 and the rear end cover 4, and they move relative to each other to form a vacuum sealing structure, so that when part of the grease seeps out, the labyrinth sealing structure can further prevent the grease from seeping out.

[0025] Embodiment 4 is a further improvement based on embodiment 1, wherein the outer surfaces of the front sealing ring 1 and the rear sealing ring 3 are both provided with sealing grooves, and the sealing grooves are fixedly provided with end face seals 16, and the ends of the end face seals 16 are respectively located at the contact surface between the front sealing ring 1 and the front end cover 2 and at the contact surface between the rear sealing ring 3 and the rear end cover 4. When there is partial grease seepage, the end face seals 16 on the outer sides of the front sealing ring 1 and the rear sealing ring 3 can completely prevent the grease from leaking, and the end face seals 16 can also prevent external impurities from entering the bearing.

[0026] Embodiment 5, as Figure 5As shown, based on the further improvement of the fourth embodiment, the end face seal 16 includes a contact ring 161 and a sealing ring 162, the contact ring 161 and the sealing ring 162 are of an integrated design, the contact ring 161 is respectively against the side surfaces of the sealing grooves outside the front sealing ring 1 and the rear sealing ring 3, and the ends of the sealing ring 162 are respectively in contact with the front end cover 2 and the rear end cover 4. When in use, the end face seal 16 is installed in the sealing groove, and the contact ring 161 is against the side surface of the sealing groove, so that the sealing ring 162 has a force in the direction of the front sealing ring 1 and the rear sealing ring 3, and then the outermost circle of the sealing ring 162 is respectively in contact with the front end cover 2 and the rear end cover 4, thereby achieving the effect of soft sealing.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A grease anti-hardening structure for the main shaft bearing of a wind turbine generator set, characterized in that: The invention comprises a front sealing ring (1), a front end cover (2), a rear sealing ring (3) and a rear end cover (4), wherein the front sealing ring (1) and the rear sealing ring (3) are both fixedly sleeved on the outer surface of the main shaft (5), the front sealing ring (1) and the rear sealing ring (3) are respectively located on two side surfaces of a main shaft bearing (6), the inner ring of the main shaft bearing (6) is fixedly sleeved on the outer surface of the main shaft (5), the outer ring of the main shaft bearing (6) is fixedly mounted on a bearing seat (17), and the inner rings of the front end cover (2) and the rear end cover (4) are respectively movably connected to the front sealing ring (1) and the rear sealing ring (3); The outer surfaces of the front sealing ring (1) and the rear sealing ring (3) are both provided with an oil scraper ring (7); a plurality of oil scraper plates (8) are evenly fixedly mounted on the side of the oil scraper ring (7) close to the main shaft bearing (6); an oil squeeze plate (9) is fixedly mounted on the side of the oil scraper ring (7) away from the main shaft bearing (6); a first oil collecting bottle (10) and a second oil collecting bottle (11) are respectively fixedly mounted on the outer surfaces of the front end cover (2) and the rear end cover (4); an oil outlet (18) is provided on the front end cover (2) and the rear end cover (4); the oil collecting end of the first oil collecting bottle (10) passes through the oil outlet (18) and is connected to a cavity between the oil scraper ring (7) on the front sealing ring (1) and the front end cover (2); the second oil collecting bottle (11) passes through the oil outlet (18) and is connected to a cavity between the oil scraper ring (7) on the rear sealing ring (3) and the rear end cover (4); A positive thread structure and a negative thread structure are respectively provided on the side of the outer surface of the front sealing ring (1) and the rear sealing ring (3) close to the main shaft bearing (6), and the thread rotation direction of the positive thread structure and the negative thread structure are both in the direction of the main shaft bearing (6); The cross section of the oil squeezing plate (9) is a triangular cone.

2. The anti-hardening structure of grease for main shaft bearing of wind turbine generator set according to claim 1, characterized in that: An annular protrusion (14) is provided on the side surfaces of the front sealing ring (1) and the rear sealing ring (3), and an annular groove (15) is provided below the inner surfaces of the front end cover (2) and the rear end cover (4), and the annular protrusion (14) matches the annular groove (15).

3. The anti-hardening structure of grease for main shaft bearing of wind turbine generator set according to claim 1, characterized in that: The outer surfaces of the front sealing ring (1) and the rear sealing ring (3) are both provided with sealing grooves, and the sealing grooves are fixedly provided with end face seals (16), and the ends of the end face seals (16) are respectively located at the contact surface between the front sealing ring (1) and the front end cover (2) and at the contact surface between the rear sealing ring (3) and the rear end cover (4).

4. The anti-hardening structure of grease for main shaft bearing of wind turbine generator set according to claim 3 is characterized in that: The end face seal (16) comprises a contact ring (161) and a sealing ring (162); the contact ring (161) and the sealing ring (162) are of an integrated design; the contact ring (161) respectively contacts the side surfaces of the sealing grooves on the outsides of the front sealing ring (1) and the rear sealing ring (3); and the ends of the sealing ring (162) respectively contact the front end cover (2) and the rear end cover (4).

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