Sealing structure for output shaft of wind power gear box
Through the design of multiple sealing structures and oil barrier devices, the problem of oil leakage caused by aging of the sealing materials of traditional wind power gearbox output shafts is solved, and the reliable sealing of the wind power gearbox output shafts is achieved, which reduces lubricant leakage and waste, and extends the equipment lifespan and reduce maintenance costs.
Patent Information
- Application Number
- CN202323560158.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-26
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2033-12-26
AI Technical Summary
Due to the aging of materials, the contact seal of traditional wind power gearbox output shafts often fails within two years of use, causing oil leakage, affecting the normal operation of the generator set and increasing maintenance costs.
It adopts a multi-seal structure, including the gearbox back cover, output shaft, connecting sealing device and output end cover, through the first, second and third oil return channels and oil barrier devices, using bearing components, oil swing rings and positioning devices, Realize the lubricant to be guided step by step back into the gearbox to reduce leakage and waste.
It realizes reliable sealing of the output shaft of the wind power gearbox, reduces the leakage and waste of lubricant, extends the service life of the equipment, and reduces shutdown and maintenance costs.
Smart Images
Figure CN222315867U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wind power gear box sealing, and more specifically relates to a wind power gear box output shaft sealing structure. Background Art
[0002] As a clean and renewable energy, wind power generation is extremely environmentally friendly and has huge wind energy reserves, which has attracted more and more attention from countries around the world. Gearbox is an indispensable component in semi-direct drive and doubly fed wind turbine generator sets. Lubricating oil in the gearbox reduces friction, avoids heat, and prevents machine wear. In order to prevent oil leakage at the output shaft of the gearbox, it must be sealed.
[0003] Traditional technology generally uses contact seals, such as skeleton seals. Due to material reasons, this type of sealing will gradually experience problems such as aging and corrosion as the service life increases. Generally, it will fail within two years of operation and cause oil leakage in the gearbox, thus affecting the normal operation of the device and causing additional downtime, maintenance and other costs for the generator set. Utility Model Content
[0004] In view of this, the utility model provides a wind power gearbox output shaft sealing structure, which has the advantages of simple and compact device structure and adopts multiple sealing structures to achieve reliable sealing at the gearbox output shaft.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A wind power gearbox output shaft sealing structure, comprising: a gearbox rear cover, an output shaft, a connecting sealing device, and an output end cover; the gearbox rear cover is sleeved on the inner side of the end of the output shaft through the connecting sealing device, the output end cover is sleeved on the outer side of the end of the output shaft and connected to the gearbox rear cover, and the gearbox rear cover is provided with a first oil return channel, a second oil return channel and a third oil return channel; the connecting sealing device comprises a first oil blocking device, a second oil blocking device and a third oil blocking device, the first oil blocking device, the second oil blocking device and the third oil blocking device are sequentially arranged between the gearbox rear cover and the output shaft from inside to outside in the axial direction, a positioning device is arranged between the first oil blocking device, the second oil blocking device, the third oil blocking device and the output end cover, one end of the first oil return channel is communicated with the first oil blocking device, and the other end is communicated with the inside of the gearbox; one end of the second oil return channel is communicated with the second oil blocking device, and the other end is communicated with the inside of the gearbox; one end of the third oil return channel is communicated with the third oil blocking device, and the other end is communicated with the inside of the gearbox.
[0007] Furthermore, the first oil deflector device includes a bearing assembly and a first oil deflector ring, and the bearing assembly and the first oil deflector ring are arranged in sequence from inside to outside in the axial direction. The bearing assembly is arranged at the entrance of the first oil return channel, and a first annular cavity is arranged on the inner side of the first oil deflector ring.
[0008] Furthermore, the bearing assembly includes a first tapered roller bearing, a bearing spacer and a second tapered roller bearing. The first tapered roller bearing, the bearing spacer and the second tapered roller bearing are arranged in sequence from the inside to the outside in the axial direction between the gear box rear cover and the output shaft. The bearing spacer is located at the entrance of the first oil return channel.
[0009] Furthermore, the second oil deflector device includes a first oil flinger ring and a second oil deflector ring, the first oil flinger ring and the second oil deflector ring are radially installed from inside to outside between the output shaft and the gear box rear cover, a second annular cavity is provided on the inner side of the second oil deflector ring, and a first oil return hole is provided on the second oil deflector ring, and the first oil return hole is connected to the second oil return channel.
[0010] Furthermore, a first convex cone ring is arranged on the inner side of the second oil slinger ring, and a first concave cone ring matched with the first convex cone ring is arranged on the outer side of the first oil slinger ring.
[0011] Furthermore, the third oil deflector device includes a third oil deflector ring and a second oil slinger ring. The second oil slinger ring and the third oil deflector ring are radially installed from inside to outside between the output shaft and the gear box rear cover. A third annular cavity is provided on the inner side of the third oil deflector ring. A second oil return hole is provided on the third oil deflector ring, and the second oil return hole is connected to the third oil return channel.
[0012] Furthermore, a second convex cone ring is arranged on the inner side of the third oil slinger ring, and a second concave cone ring matched with the second convex cone ring is arranged on the outer side of the second oil slinger ring.
[0013] Furthermore, the end surfaces of the first oil slinger ring and the second oil slinger ring are both arranged in a stepped shape.
[0014] Furthermore, the positioning device adopts a positioning pin, and the contact places among the first oil deflector ring, the second oil deflector ring, the third oil deflector ring and the output end cover are all provided with positioning slots, and the positioning pins are all provided in the positioning slots.
[0015] Furthermore, a protrusion is provided on the output shaft at a location in contact with the first oil flinger ring, a concave ring groove is provided on the output shaft at a location on the right side of the second oil flinger ring, a retaining spring is provided in the concave ring groove, and the retaining spring and the protrusion cooperate to clamp the first oil flinger ring and the second oil flinger ring.
[0016] Beneficial effects of the utility model:
[0017] The device has a simple and compact structure. The first oil baffle device, the second oil baffle device and the third oil baffle device guide the outflowing lubricating oil back to the gear box step by step through the first oil return channel, the second oil return channel and the third oil return channel respectively, thereby reducing the leakage and waste of the lubricating oil. The setting of the first annular cavity, the second annular cavity and the third annular cavity has a blocking and buffering effect on the outflowing lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0020] Figure 2 for Figure 1 A partial enlargement of the upper part.
[0021] Figure 3 for Figure 1 A partial enlargement of the lower half of the image.
[0022] Figure 4 It is a schematic diagram of the structure of the second oil deflector ring and the third oil deflector ring.
[0023] Figure 5 It is an upper half cross-sectional view of the first oil slinger ring and the second oil slinger ring.
[0024] Among them, in the figure:
[0025] 101-gearbox rear cover; 201-output shaft; 501-first oil slinger; 301-first tapered roller bearing; 302-second tapered roller bearing; 401-bearing spacer; 701-first oil slinger; 502-second oil slinger; 503-third oil slinger; 702-second oil slinger; 901-locating pin; 801-circlip; 601-output end cover. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] Please refer to the attached Figure 1-5 , the utility model provides a wind power gearbox output shaft sealing structure, including: a gearbox rear cover 101, an output shaft 201, a connecting sealing device, and an output end cover 601;
[0028] The gearbox rear cover 101 is sleeved on the inner side of the end of the output shaft 201 through a connecting sealing device, and the output end cover 601 is sleeved on the outer side of the end of the output shaft 201 and connected to the gearbox rear cover 101. The gearbox rear cover 101 is provided with a first oil return channel, a second oil return channel and a third oil return channel; the connecting sealing device includes a first oil blocking device, a second oil blocking device and a third oil blocking device, and the first oil blocking device, the second oil blocking device and the third oil blocking device are sequentially arranged between the gearbox rear cover 101 and the output shaft 201 from the inside to the outside in the axial direction, and a positioning device is arranged between the first oil blocking device, the second oil blocking device, the third oil blocking device and the output end cover 601, one end of the first oil return channel is connected to the first oil blocking device, and the other end is connected to the inside of the gearbox; one end of the second oil return channel is connected to the second oil blocking device, and the other end is connected to the inside of the gearbox; one end of the third oil return channel is connected to the third oil blocking device, and the other end is connected to the inside of the gearbox. The first oil retaining device includes a bearing assembly and a first oil retaining ring 501, which are arranged in sequence from inside to outside in the axial direction, the bearing assembly is arranged at the entrance of the first oil return channel, and a first annular cavity is arranged on the inner side of the first oil retaining ring 501. The bearing assembly includes a first tapered roller bearing 301, a bearing spacer 401 and a second tapered roller bearing 302, the first tapered roller bearing 301, the bearing spacer 401 and the second tapered roller bearing 302 are arranged in sequence from inside to outside in the axial direction between the gear box rear cover 101 and the output shaft 201, and the bearing spacer 401 is located at the entrance of the first oil return channel. The first tapered roller bearing 301 and the second tapered roller bearing 302 are respectively fitted with the output shaft 201 by interference. The second oil deflector comprises a first oil slinger 701 and a second oil deflector 502, which are radially mounted from inside to outside between the output shaft 201 and the gearbox rear cover 101, a second annular cavity is arranged on the inner side of the second oil deflector 502, a first oil return hole is arranged on the second oil deflector 502, and the first oil return hole is communicated with the second oil return channel. A first convex cone ring is arranged on the inner side of the second oil deflector 502, and a first concave cone ring matched with the first convex cone ring is arranged on the outer side of the first oil deflector 701. The third oil deflector comprises a third oil deflector 503 and a second oil deflector 702, which are radially mounted from inside to outside between the output shaft 201 and the gearbox rear cover 101, a third annular cavity is arranged on the inner side of the third oil deflector 503, a second oil return hole is arranged on the third oil deflector 503, and the second oil return hole is communicated with the third oil return channel. A second convex cone ring is disposed on the inner side of the third oil retaining ring 503, and a second concave cone ring matched with the second convex cone ring is disposed on the outer side of the second oil slinger ring 702. The end faces of the first oil slinger ring 701 and the second oil slinger ring 702 are both arranged in a stepped shape to enhance the oil slinging efficiency of the first oil slinger ring 701 and the second oil slinger ring 702.The positioning device uses a positioning pin 901, and the contacting places among the first oil slinger 501, the second oil slinger 502, the third oil slinger 503 and the output end cover 601 are all provided with positioning slots, and the positioning slots are all provided with positioning pins 901. A protrusion is provided at the contacting place of the first oil slinger 501 on the output shaft 201, and a concave ring groove is provided at the right side of the second oil slinger 702 on the output shaft 201, and a retaining spring 801 is provided in the concave ring groove, and the retaining spring 801 and the protrusion cooperate to clamp the first oil slinger 701 and the second oil slinger 702.
[0029] An annular groove is arranged on the inner wall of the gearbox rear cover 101, and the first oil retaining ring 501, the second oil retaining device and the third oil retaining device are installed between the output shaft 201 and the annular groove. The inner wall of the annular groove cooperates with the output end cover 601 to press the first oil retaining ring 501, the second oil retaining ring 502 and the third oil retaining ring 503. The first oil slinger ring 701 and the second oil slinger ring 702 are installed with the output shaft 201 in an interference fit. The first annular cavity, the second annular cavity and the third annular cavity are arranged so that the rotating output shaft 201 will throw the lubricating oil into them without splashing everywhere, and then under the action of gravity, it will flow back again, playing a blocking and buffering effect. The arrangement of the first convex cone ring, the first concave cone ring, the second convex cone ring and the second concave cone ring plays a role in labyrinth sealing and preventing the second oil retaining ring 7502 and the third oil retaining ring 503 from moving in the radial direction.
[0030] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A wind turbine gearbox output shaft (201) sealing structure, characterized in that: include: Gearbox rear cover (101), output shaft (201), connecting seal device, output end cover (601); The gearbox rear cover (101) is sleeved on the inner side of the end of the output shaft (201) through the connecting sealing device; the output end cover (601) is sleeved on the outer side of the end of the output shaft (201) and connected to the gearbox rear cover (101); the gearbox rear cover (101) is provided with a first oil return channel, a second oil return channel and a third oil return channel; the connecting sealing device comprises a first oil baffle device, a second oil baffle device and a third oil baffle device; the first oil baffle device, the second oil baffle device and the third oil baffle device are connected in the axial direction by The first oil baffle device, the second oil baffle device, the third oil baffle device and the output end cover (601) are sequentially arranged from inside to outside between the gear box rear cover (101) and the output shaft (201), and a positioning device is arranged between the first oil baffle device, the second oil baffle device, the third oil baffle device and the output end cover (601); one end of the first oil return channel is connected to the first oil baffle device, and the other end is connected to the inside of the gear box; one end of the second oil return channel is connected to the second oil baffle device, and the other end is connected to the inside of the gear box; one end of the third oil return channel is connected to the third oil baffle device, and the other end is connected to the inside of the gear box.
2. A wind turbine gearbox output shaft (201) sealing structure according to claim 1, characterized in that: The first oil deflector device comprises a bearing assembly and a first oil deflector ring (501), wherein the bearing assembly and the first oil deflector ring (501) are arranged in sequence from inside to outside in the axial direction, the bearing assembly is arranged at the entrance of the first oil return channel, and a first annular cavity is arranged on the inner side of the first oil deflector ring (501).
3. A wind turbine gearbox output shaft (201) sealing structure according to claim 2, characterized in that: The bearing assembly comprises a first tapered roller bearing (301), a bearing spacer (401) and a second tapered roller bearing (302); the first tapered roller bearing (301), the bearing spacer (401) and the second tapered roller bearing (302) are arranged in sequence from inside to outside in the axial direction between the gear box rear cover (101) and the output shaft (201); the bearing spacer (401) is located at the entrance of the first oil return channel.
4. A wind turbine gearbox output shaft (201) sealing structure according to claim 2, characterized in that: The second oil deflector device comprises a first oil flinger ring (701) and a second oil deflector ring (502); the first oil flinger ring (701) and the second oil deflector ring (502) are radially mounted from inside to outside between the output shaft (201) and the gear box rear cover (101); a second annular cavity is arranged on the inner side of the second oil deflector ring (502); a first oil return hole is arranged on the second oil deflector ring (502); and the first oil return hole is communicated with the second oil return channel.
5. A wind turbine gearbox output shaft (201) sealing structure according to claim 4, characterized in that: A first convex cone ring is arranged on the inner side of the second oil-slinging ring (502), and a first concave cone ring matching with the first convex cone ring is arranged on the outer side of the first oil-slinging ring (701).
6. A wind turbine gearbox output shaft (201) sealing structure according to claim 4, characterized in that: The third oil deflector device comprises a third oil deflector ring (503) and a second oil slinger ring (702). The second oil slinger ring (702) and the third oil deflector ring (503) are radially installed from inside to outside between the output shaft (201) and the gear box rear cover (101). A third annular cavity is arranged on the inner side of the third oil deflector ring (503). A second oil return hole is arranged on the third oil deflector ring (503). The second oil return hole is connected to the third oil return channel.
7. A wind turbine gearbox output shaft (201) sealing structure according to claim 6, characterized in that: A second convex cone ring is arranged on the inner side of the third oil slinger ring (503), and a second concave cone ring matched with the second convex cone ring is arranged on the outer side of the second oil slinger ring (702).
8. A wind turbine gearbox output shaft (201) sealing structure according to claim 6, characterized in that: The end surfaces of the first oil slinger ring (701) and the second oil slinger ring (702) are both arranged in a stepped shape.
9. A wind turbine gearbox output shaft (201) sealing structure according to claim 8, characterized in that: The positioning device adopts a positioning pin (901), and the contact places between the first oil deflector ring (501), the second oil deflector ring (502), the third oil deflector ring (503) and the output end cover (601) are all provided with positioning slots, and the positioning pins (901) are all provided in the positioning slots.
10. A wind turbine gearbox output shaft (201) sealing structure according to claim 9, characterized in that: A protrusion is provided on the output shaft (201) at a location in contact with the first oil flinger ring (501), and a concave ring groove is provided on the output shaft (201) at a location on the right side of the second oil flinger ring (702). A retaining spring (801) is provided in the concave ring groove, and the retaining spring (801) and the protrusion cooperate to clamp the first oil flinger ring (701) and the second oil flinger ring (702).