Oil lubrication and sealing system for wind turbine transmission system

Abstract

The invention discloses an oil lubrication and sealing system for a wind turbine transmission system, and relates to the technical field of wind turbines. In the oil lubrication and sealing system for a wind turbine transmission system, a sealing end cover is fixed to the front end of a bearing seat, a main shaft is rotationally connected to the bearing seat, and the main shaft is rotationally plugged into the sealing end cover, and the sealing end cover cooperates with the main shaft seal; an annular labyrinth seal structure arranged around the main shaft is provided between the sealing end cover and the main shaft, and an oil return hole is provided on the sealing end cover at the front end of the labyrinth seal structure, one end of the oil return hole is connected to the inside of the bearing seat through the labyrinth seal structure, and the other end is connected to the oil tank. The labyrinth seal structure can be effectively sealed, and if the lubricating oil in the bearing seat passes through the labyrinth seal structure, it can also be discharged back to the oil tank through the oil return hole to avoid oil leakage outside the unit, and the leaf spring radial seal can be cancelled. Since the labyrinth seal structure can be directly processed on the main shaft and the sealing end cover, the maintenance and replacement frequency of the seal between the main shaft and the sealing end cover can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generator sets, and in particular to an oil lubrication and sealing system for a transmission system of a wind turbine generator set. Background Art

[0002] With the development of economy and technology, wind turbines, as one of the main sources of clean energy, have attracted much attention. In wind turbines, the main shaft bearing oil lubrication and sealing system is an important structure to ensure the continuous and stable operation of wind turbines. Its main function is to prevent the leakage of lubricating media (such as lubricating oil and grease) to ensure that the main shaft bearing runs in a good lubrication system.

[0003] Among them, the main shaft of the wind turbine needs to be lubricated by spraying oil. However, the leaf spring used in the traditional sealing system is used for radial sealing between the main shaft and the sealing end cover. It is costly, easy to wear, and needs to be replaced. In addition, the leaf spring radial seal has high requirements on the hardness of the contact surface and needs to be equipped with a special metal ring, which further increases the cost.

[0004] Therefore, how to reduce the maintenance and replacement frequency of the seal between the main shaft and the sealing end cover is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an oil lubrication and sealing system for a wind turbine transmission system, which can reduce the maintenance and replacement frequency of the seal between the main shaft and the sealing end cover.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An oil lubrication and sealing system for a wind turbine transmission system comprises: a main shaft, a bearing seat and a sealing end cover; the sealing end cover is fixed to the front end of the bearing seat, the main shaft is rotatably connected to the bearing seat, the main shaft is rotatably plugged into the sealing end cover, and the sealing end cover is in sealing cooperation with the main shaft; an annular labyrinth sealing structure arranged around the main shaft is provided between the sealing end cover and the main shaft, the sealing end cover is provided with an oil return hole at the front end of the labyrinth sealing structure, one end of the oil return hole is connected to the interior of the bearing seat through the labyrinth sealing structure, and the other end is connected to an oil tank.

[0008] Preferably, the inner hole of the sealing end cover is sleeved on the main shaft, and an annular oil chamber surrounding the main shaft is arranged on the inner hole in front of the labyrinth sealing structure. An oil retaining ring is fixedly arranged on the main shaft, and the oil retaining ring extends radially into the oil chamber, and the oil return hole is connected to the labyrinth sealing structure through the oil chamber.

[0009] Preferably, the oil return hole is located below the main shaft, the oil return hole, the first oil return pipe and the oil tank form a U-shaped tube structure, and the portion of the labyrinth sealing structure that is connected to the side wall of the oil return hole is higher than the liquid level of the oil tank.

[0010] Preferably, the rear end of the bearing seat is connected to a gear box, and the oil tank is a gear box oil tank arranged at the bottom of the gear box.

[0011] Preferably, the main shaft is rotatably connected to the bearing seat through a front bearing and a rear bearing, and the front bearing and the rear bearing are arranged in sequence along the front-to-back direction; a front oil baffle plate is arranged on the inner bottom wall of the bearing seat between the front bearing and the rear bearing, and the space in the bearing seat between the sealing end cover and the front oil baffle plate forms a front oil storage tank.

[0012] Preferably, the inner wall of the bearing seat protrudes radially inward to form a rear mounting convex ring, the rear mounting convex ring is arranged on the rear bearing, the main shaft is connected to the rear bearing, the bearing seat is located at the rear side of the rear bearing and a rear oil baffle plate is arranged, and the bottom of the rear oil baffle plate is fixed to the rear side surface of the rear mounting convex ring, and the space between the front end of the outer ring of the rear bearing and the rear oil baffle plate in the bearing seat forms a rear oil storage tank.

[0013] Preferably, the sealing end cover is made of engineering plastic material.

[0014] Preferably, the sealing end cover comprises a plurality of end cover plates which are sequentially spliced ​​along the circumferential direction, and each of the end cover plates is sequentially butted together to form an inner hole, and the main shaft is inserted into the inner hole.

[0015] Preferably, the contact surfaces of two adjacent end cover panels are plug-fitted and provided with sealant.

[0016] Preferably, a mounting groove is provided on the rear side of the sealing end cover, a sealing ring is provided in the mounting groove to seal between the front side of the bearing seat and the rear side of the sealing end cover, and a sealant is provided between the front side of the bearing seat and the rear side of the sealing end cover.

[0017] The oil lubrication and sealing system of the wind turbine transmission system provided by the present invention comprises: a main shaft, a bearing seat and a sealing end cover; the sealing end cover is fixed to the front end of the bearing seat, the main shaft is rotatably connected to the bearing seat, the main shaft is rotatably plugged into the sealing end cover, and the sealing end cover and the main shaft seal cooperate; an annular labyrinth sealing structure arranged around the main shaft is provided between the sealing end cover and the main shaft, and an oil return hole is provided on the sealing end cover at the front end of the labyrinth sealing structure, one end of the oil return hole is connected to the inside of the bearing seat through the labyrinth sealing structure, and the other end is connected to the oil tank.

[0018] The labyrinth seal structure can effectively seal. In special circumstances, if the lubricating oil in the bearing seat passes through the labyrinth seal structure, the lubricating oil can be discharged back to the oil tank through the oil return hole to prevent oil leakage outside the unit. The leaf spring radial seal can be cancelled. Since the labyrinth seal structure can be directly processed on the main shaft and the sealing end cover, the maintenance and replacement frequency of the seals between the main shaft and the sealing end cover can be reduced. In addition, adding an oil return hole can also cooperate with the labyrinth seal structure to ensure the ability to prevent oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention 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 described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 This is an internal structure diagram of a specific embodiment 1 of the oil lubrication and sealing system of a wind turbine transmission system provided by the present invention when the unit is in a normal operating state (tilted backward 7°);

[0021] Figure 2 The oil lubrication and sealing system for the wind turbine transmission system provided by the present invention is a specific embodiment 1 of the maximum 10° (compared to Figure 1 Internal structure diagram of forward tilt (10°) in forward tilt nodding condition;

[0022] Figure 3 for Figure 1 The enlarged view of point W;

[0023] Figure 4 for Figure 1 Enlarged view of Q;

[0024] Figure 5 It is a structural diagram of the sealing end cover in the specific embodiment 1 of the oil lubrication and sealing system of the wind turbine transmission system provided by the present invention;

[0025] Figure 6 It is a partial structural diagram of the sealing end cover in the specific embodiment 1 of the oil lubrication and sealing system of the wind turbine transmission system provided by the present invention;

[0026] Figure 7 It is a structural diagram of the upper half of the specific embodiment 1 of the oil lubrication and sealing system of the wind turbine transmission system provided by the present invention;

[0027] Figure 8 This is a structural diagram of the lower half of the specific embodiment 1 of the oil lubrication and sealing system of the wind turbine transmission system provided by the present invention.

[0028] Reference numerals:

[0029] Dustproof sealing ring 1;

[0030] Main shaft 2, bearing shoulder 21, fixed boss 211, labyrinth protrusion 212, fixed groove 213;

[0031] Oil retaining ring 3;

[0032] Sealing end cover 4, upper half 41, lower half 42, oil chamber 43, oil return hole 44, labyrinth seal structure 45, mounting groove 46, inner hole 47;

[0033] Bearing seat 5, front oil baffle plate 51, rear oil baffle plate 52, front oil reservoir 53, rear oil reservoir 54, rear mounting convex ring 55;

[0034] Front bearing 6;

[0035] Sealing ring 7;

[0036] Rear bearing 8;

[0037] The first oil return pipe 9;

[0038] Lubrication pump 10;

[0039] Gear box 11, oil tank 111;

[0040] Rear nozzle 12;

[0041] Front nozzle 13;

[0042] Second oil return pipe 14;

[0043] The front oil reservoir level is A, the rear oil reservoir level is B, and the fuel tank level is C. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The core of the present invention is to provide an oil lubrication and sealing system for a wind turbine transmission system, which can reduce the maintenance and replacement frequency of the seal between the main shaft and the sealing end cover.

[0046] For a specific embodiment of the oil lubrication and sealing system for the wind turbine transmission system provided by the present invention, please refer to Figures 1 to 8 , including: a main shaft 2, a bearing seat 5 and a sealing end cover 4.

[0047] The sealing end cover 4 is fixed to the front end of the bearing seat 5 , the main shaft 2 is rotatably connected to the bearing seat 5 , the main shaft 2 is rotatably plugged into the sealing end cover 4 , and the sealing end cover 4 is sealed and matched with the main shaft 2 .

[0048] There is an annular labyrinth seal structure 45 arranged around the main shaft 2 between the sealing end cover 4 and the main shaft 2. The labyrinth seal structure 45 is a labyrinth gap formed between the main shaft 2 and the sealing end cover 4 by setting matching teeth or grooves. For example, the main shaft 2 is provided with a plurality of teeth in sequence along the axial direction, and a plurality of grooves corresponding to each tooth are provided on the inner hole of the sealing end cover 4. The heights of different teeth and the depths of different grooves are different to form a labyrinth gap. The labyrinth seal structure 45 can play a sealing role by means of throttling effect. There is an oil return hole 44 on the sealing end cover 4 at the front end of the labyrinth seal structure 45. One end of the oil return hole 44 is connected to the inside of the bearing seat 5 through the labyrinth seal structure 45, and the other end is connected to the oil tank 111.

[0049] When the unit is in normal operation, Figure 1 As shown, the unit is usually in a state of 7° backward tilt, and the labyrinth seal structure 45 can effectively seal. In special cases, such as Figure 2 As shown, under the maximum nodding condition of the unit (starting from the state of backward tilting 7° to forward tilting 10°), the unit is in a state of forward tilting 3°. At this time, due to the requirements of the radial size of the main shaft 2 and other factors, the oil in the bearing seat 5 may be higher than the labyrinth seal structure 45 located below it on the main shaft 2. If the lubricating oil in the bearing seat 5 passes through the labyrinth seal structure 45, the lubricating oil can be discharged back to the oil tank 111 through the oil return hole 44 to prevent the oil from leaking out of the unit. In addition, the oil lubrication and sealing system of the wind turbine transmission system can specifically be an oil lubrication and sealing system of the floating wind turbine transmission system.

[0050] To improve the sealing effect, such as Figure 3 and Figure 4 As shown, the inner hole 47 of the sealing end cover 4 is sleeved on the main shaft 2, and an annular oil chamber 43 surrounding the main shaft 2 is arranged on the inner hole 47 of the sealing end cover 4 in front of the labyrinth seal structure 45. The main shaft 2 is fixedly provided with an oil retaining ring 3. The oil retaining ring 3 extends radially into the oil chamber 43, and the oil return hole 44 is connected to the labyrinth seal structure 45 through the oil chamber 43. In other words, if oil leaks forward from the labyrinth seal structure 45, it will be blocked by the oil retaining ring 3, so that the oil flowing out of the labyrinth seal structure 45 in the axial direction is radially guided to the oil chamber 43, and enters the oil return hole 44 more smoothly, further improving the reliability of anti-leakage.

[0051] Among them, in order to realize the installation of the oil deflector 3, a fixed groove 213 is set on the main shaft 2, the inner end of the oil deflector 3 in the radial direction extends into the fixed groove 213, and the outer end protrudes relative to the outer peripheral surface of the main shaft 2. Specifically, in the axial direction, the labyrinth seal structure 45 is close to the end port of the oil deflector 3 and is parallel to the axial projection on the oil deflector 3 to improve the oil deflection effect. Specifically, there is still a gap between the outer end of the oil deflector 3 in the radial direction and the sealing end cover 4. In addition, the number of oil deflector rings 3 can be set according to the installation needs, for example, two are set in sequence along the axial direction, and other numbers can also be set. In addition, the height of the oil deflector 3 and the depth of the oil cavity 43 of the sealing end cover 4 can be set as needed, and heightening and deepening can improve the sealing effect. The oil deflector 3 is made of flexible material and is a flexible oil deflector, so that it can avoid the damage caused by the labyrinth system components during the installation and operation of the wind turbine set. In addition, since the oil deflector 3 is flexible, it is easy to install and maintain.

[0052] In addition, if Figure 3 As shown, a dustproof sealing ring 1 is also fixedly arranged on the main shaft 2 to cover the gap between the front end of the sealing end cover 4 and the main shaft 2.

[0053] Specifically, to facilitate assembly, Figure 1 As shown, a local protrusion on the main shaft 2 forms a bearing shoulder 21, and sealing-related components are installed on the bearing shoulder 21. Among them, a fixed boss 211 for fixing the dust seal ring 712 is processed on the bearing shoulder 21. Specifically, the two ends of the dust seal ring 1 in the axial direction are respectively against the fixed boss 211 and the front side of the sealing end cover 4, and two fixed grooves 213 for fixing the oil retaining ring 3 are processed on the rear side of the fixed boss 211. Two labyrinth protrusions 212 are processed on the bearing shoulder 21 at the rear side of the fixed groove 213. The labyrinth protrusion 212 and the inner hole 47 of the sealing end cover 4 form a labyrinth channel with a gap of 4 to 6 mm (specifically, it can refer to the gap between the axially or radially opposite surfaces), and the radial heights of the two labyrinth protrusions 212 are different.

[0054] To facilitate rapid oil return, Figure 1 As shown, the oil return hole 44 is located below the main shaft 2, and the oil return hole 44, the first oil return pipe 9 and the oil tank 111 form a U-shaped pipe structure, and the portion of the labyrinth seal structure 45 that is connected to the upper side wall of the oil return hole 44 is higher than the liquid level of the oil tank 111. Then, by directly using hydraulic pressure, it can be ensured that the oil in the oil return hole 44 will not flow back to the labyrinth seal structure 45, and the oil flowing from the labyrinth seal structure 45 to the oil return hole 44 can flow into the oil tank 111 under the action of hydraulic pressure. Of course, in other embodiments, a pump can also be added to the first oil return pipe 9 to drive the oil to flow to the oil tank 111 by external force. In addition, a one-way valve can also be set on the first oil return pipe 9 to effectively prevent the oil from flowing back from the oil tank 111 to the oil return hole 44.

[0055] Among them, in order to ensure the height relationship between the liquid level in the oil tank 111 and the labyrinth sealing structure 45, the amount of oil injected into the oil tank 111 can be controlled, or a liquid level gauge and an alarm can be added to the oil tank 111. When the oil amount exceeds the liquid level, the alarm will sound, thereby effectively controlling the liquid level.

[0056] To facilitate the setting of the fuel tank 111, Figure 1 As shown, the rear end of the bearing seat 5 is connected to the gear box 11, which can specifically seal the rear end of the bearing seat 5. The oil tank 111 is a gear box oil tank arranged at the bottom of the gear box 11, so there is no need to add a separate oil tank 111. In order to meet the height requirements of the oil tank 111 and the labyrinth seal structure 45, the oil tank 111 is designed to be sunken as much as possible. In addition, the main shaft 2 can be connected to the gear structure in the gear box 11. At the same time, the gear box oil tank and the bearing seat 5 can also be connected.

[0057] like Figure 1 and Figure 2 As shown, the main shaft 2 is rotatably connected to the bearing seat 5 through the front bearing 6 and the rear bearing 8. The front bearing 6 and the rear bearing 8 are arranged in sequence along the front-to-back direction to ensure the smooth rotation of the main shaft 2.

[0058] To ensure adequate lubrication of the front bearing 6, Figure 1 and Figure 2 As shown, a front oil baffle plate 51 is provided on the inner bottom wall between the front bearing 6 and the rear bearing 8 in the bearing seat 5, and a front oil reservoir 53 is formed in the space between the sealing end cover 4 and the front oil baffle plate 51 in the bearing seat 5, which can effectively store oil to ensure sufficient lubrication of the front bearing 6. The front oil baffle plate 51 and the bearing seat 5 can be cast as one piece.

[0059] To ensure adequate lubrication of the rear bearing 8, Figure 1 and Figure 2 As shown, the inner wall of the bearing seat 5 radially protrudes inward to form a rear mounting convex ring 55, and the rear mounting convex ring 55 is provided on the rear bearing 8. The bearing seat 5 is provided with a rear oil baffle plate 52 at the rear side of the rear bearing 8, and the bottom of the rear oil baffle plate 52 is fixed to the rear side of the rear mounting convex ring 55. The space between the front end of the outer ring of the rear bearing 8 and the rear oil baffle plate 52 in the bearing seat 5 forms a rear oil reservoir 54. In addition, the rear side of the rear oil baffle plate 52 can also block the oil in the oil tank 111. Among them, the rear oil baffle plate 52 is fastened to the bearing seat 5 by bolts to adapt to the structural feature that the middle part of the rear bearing 8 protrudes backward.

[0060] Since the front oil baffle plate 51 and the rear oil baffle plate 52 are provided at the bottom of the bearing seat 5, the front nozzle 13 can be provided on the sealing end cover 4 accordingly, and the rear nozzle 12 can be provided on the bearing seat 5 between the front bearing 6 and the rear bearing 8. When the lubrication system is in operation, the front nozzle 13 sprays the oil and flows down along the front bearing 6, forming an oil pool in front of the front oil baffle plate 51, so that more than 12 rollers of the front bearing 6 are immersed in the oil pool, and the front bearing 6 can be fully lubricated when the front bearing 6 rolls; the front nozzle 13 sprays the oil and flows down along the rear bearing 8, forming an oil pool in the rear of the rear oil baffle plate 52, so that more than 12 rollers of the rear bearing 8 are immersed in the oil pool, and the rear bearing 8 can be fully lubricated when the rear bearing 8 rolls.

[0061] In addition, a second oil return pipe 14 is provided at the bottom of the bearing seat 5 between the front bearing 6 and the rear bearing 8, which is connected to the bearing seat 5 and the oil tank 111, and can be specifically connected to a position on the inner bottom wall of the bearing seat 5 that is always higher than the oil tank liquid level C. When oil enters between the front bearing 6 and the rear bearing 8 from the rear oil reservoir 54, it can be returned to the oil tank 111 through the second oil return pipe 14. In addition, the lubrication pump 10 is connected to the bearing seat 5 through the front nozzle 13 and the rear nozzle 12 respectively to provide lubricating oil to the bearing seat 5.

[0062] In order to reduce the weight of the equipment, the sealing end cover 4 is made of engineering plastic material and can be formed by mold casting.

[0063] In order to facilitate the removal of the bearing during on-site inspection, the sealing end cover 4 includes a plurality of end cover plates spliced ​​in sequence along the circumferential direction, and each end cover plate is connected in sequence to form an inner hole 47, which can be detachably connected. The main shaft 2 is plugged into the inner hole 47. The contact surfaces of two adjacent end cover plates are plugged and matched and provided with sealant.

[0064] Specifically, Figures 5 to 8 As shown, there are two end cover plates, namely, a lower half plate 42 and an upper half plate 41 fixed above the lower half plate 42. Both the lower half plate 42 and the upper half plate 41 are semi-circular. In addition, protrusions and grooves are respectively provided on the connecting surfaces of the upper half plate 415 and the lower half plate 429. During installation, sealant is applied to the contact surface and the groove of the upper half plate 415 and the lower half plate 429, and then the two end cover plates are clamped and connected by a plurality of bolts. In addition, a plurality of injection pipe mounting holes are opened on the upper half plate 415, which can be used to install the front nozzle 13. The bottom of the lower half plate 429 opens an oil return hole 44, and the oil flows from the oil return hole 44 to the oil tank 111. In addition, the sealing end cover bolt holes, the injection pipe mounting holes, and the oil return hole 44 are all pre-buried with metal sleeves so that the bolts can be tightened with standard torque.

[0065] In order to improve the sealing performance between the sealing end cover 4 and the bearing seat 5, as Figure 4As shown, a mounting groove 46 is provided on the rear side of the sealing end cover 4, and a sealing ring 7, specifically an O-ring, is provided in the mounting groove 46 to seal between the front side of the bearing seat 5 and the rear side of the sealing end cover 4, and a sealant is provided between the front side of the bearing seat 5 and the rear side of the sealing end cover 4. During the assembly process, when the sealing end cover 4 and the bearing seat 5 are installed at the joint surface, the O-ring is assembled and the sealant is applied to ensure the sealing between the two.

[0066] The oil lubrication and sealing system of the wind turbine transmission system in this embodiment has the following working principles: Figure 1 The front oil reservoir level A, rear oil reservoir level B, and oil tank level C are given when the unit is tilted backward by 7° in normal operation. When the unit is operating normally, the front oil reservoir level A is lower than the labyrinth sealing structure 45 of the lower half 42 of the sealing end cover 4. The labyrinth sealing structure 45 between the sealing end cover 4 and the main shaft 2 can effectively block the splashing of spray oil. A small amount of splashed oil can also be recovered into the oil tank 111 of the gear box 11 through the oil return hole 44 below the sealing end cover 4. Figure 2 The front oil reservoir level A, the rear oil reservoir level B, and the oil tank level C are given when the unit is in the maximum forward nodding condition of 10° for an extremely short period of operation. When the unit is briefly in the maximum forward nodding condition of 10°, the front oil reservoir level A is higher than the labyrinth sealing structure 45 of the lower half 42 of the sealing end cover 4. Since the oil tank level C is designed to be lower than the labyrinth sealing structure 45 of the lower half 42 of the sealing end cover 4, the oil enters the lower half 42 of the sealing end cover 4 from the labyrinth sealing structure 45 and flows back to the oil tank 111 through the oil return hole 44.

[0067] The oil lubrication and sealing system of the wind turbine transmission system in this embodiment has the following beneficial effects: a multi-stage labyrinth seal is used between the sealing end cover 4 and the bearing seat 5, which can effectively improve the sealing effect of the sealing system, and the radial sealing ring 7 can be eliminated, and the metal ring specially installed for the radial sealing ring 7 can be correspondingly omitted, thereby reducing the design cost; the sealing end cover 4 is made of engineering plastic and has an upper and lower split structure, which has a simple structure, is easy to cast, is light in weight, and has a low cost. It is easy to install and remove in the factory and on site, and is convenient for bearing maintenance; a front oil baffle 51 is set on the front side of the bottom of the bearing seat 5. When the lubrication and sealing system is running, the front nozzle 1 The spray oil flows down along the front bearing 6 to form a front oil reservoir 53 at the front side of the front oil baffle 51, and the spray oil from the rear nozzle 12 flows down along the rear bearing 8 to form a rear oil reservoir 54 at the front side of the rear oil baffle 52, so that more than 12 rollers of the front bearing 6 and the rear bearing 8 are immersed in the front oil reservoir 53 and the rear oil reservoir 54 respectively, which can fully lubricate the front bearing 6 and the rear bearing 8; the oil level of the gear box 1116 is designed to be lowered, and when the unit is in the maximum forward tilting operation condition of 10°, the lubricating oil of the front bearing 6 can flow out from the labyrinth sealing structure of the sealing end cover 4 and quickly flow back to the oil tank 111 through the first oil return pipe 9 to prevent the leakage of the lubricating oil.

[0068] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle. In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", "multiple groups" mean two or more.

[0069] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0071] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0072] The above is a detailed introduction to the oil lubrication and sealing system of the wind turbine transmission system provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An oil lubrication and sealing system for a wind turbine transmission system, characterized in that: The invention has a forward tilting nodding working condition, comprising: a main shaft (2), a bearing seat (5) and a sealing end cover (4); the sealing end cover (4) is fixed to the front end of the bearing seat (5), the main shaft (2) is rotatably connected to the bearing seat (5), the main shaft (2) is rotatably plugged into the sealing end cover (4), and the sealing end cover (4) and the main shaft (2) are sealed together; an annular labyrinth sealing structure (45) is provided between the sealing end cover (4) and the main shaft (2) and is arranged around the main shaft (2); the sealing end cover (4) has an oil return hole (44) located at the front end of the labyrinth sealing structure (45); The inner hole (47) of the sealing end cover (4) is sleeved on the main shaft (2); an annular oil chamber (43) surrounding the main shaft (2) is arranged on the inner hole (47) in front of the labyrinth sealing structure (45); an oil retaining ring (3) is fixedly arranged on the main shaft (2); the oil retaining ring (3) extends radially into the oil chamber (43); in the axial direction, a port of the labyrinth sealing structure (45) close to the oil retaining ring (3) is projected on the oil retaining ring (3) parallel to the axial direction; one end of the oil return hole (44) is connected to the labyrinth sealing structure (45) through the oil chamber (43), and then connected to the interior of the bearing seat (5) through the labyrinth sealing structure (45); the other end is connected to the oil tank (111); The sealing end cover (4) comprises a plurality of end cover plates which are sequentially spliced ​​in the circumferential direction, and the end cover plates are sequentially butted together to form an inner hole (47), and the main shaft (2) is inserted into the inner hole (47).

2. The oil lubrication and sealing system for the wind turbine transmission system according to claim 1, characterized in that: The oil return hole (44) is located below the main shaft (2); the oil return hole (44), the first oil return pipe (9) and the oil tank (111) form a U-shaped pipe structure; and a portion of the labyrinth seal structure (45) that is connected to an upper side wall of the oil return hole (44) is higher than a liquid level of the oil tank (111).

3. The oil lubrication and sealing system for the wind turbine transmission system according to claim 1, characterized in that: The rear end of the bearing seat (5) is connected to the gear box (11), and the oil tank (111) is a gear box oil tank arranged at the bottom of the gear box (11).

4. The oil lubrication and sealing system for the wind turbine transmission system according to claim 1, characterized in that: The main shaft (2) is rotatably connected to the bearing seat (5) via a front bearing (6) and a rear bearing (8), and the front bearing (6) and the rear bearing (8) are arranged in sequence along the front-to-back direction; a front oil baffle plate (51) is provided on the inner bottom wall between the front bearing (6) and the rear bearing (8) in the bearing seat (5), and a front oil reservoir (53) is formed in the space between the sealing end cover (4) and the front oil baffle plate (51) in the bearing seat (5).

5. The oil lubrication and sealing system for the wind turbine transmission system according to claim 1, characterized in that: The inner wall of the bearing seat (5) protrudes radially inward to form a rear mounting convex ring (55), on which a rear bearing (8) is arranged, and the main shaft (2) is connected to the rear bearing (8). The bearing seat (5) is provided with a rear oil baffle plate (52) at the rear side of the rear bearing (8), and the bottom of the rear oil baffle plate (52) is fixed to the rear side surface of the rear mounting convex ring (55), and the space in the bearing seat (5) between the front end of the outer ring of the rear bearing (8) and the rear oil baffle plate (52) forms a rear oil storage tank (54).

6. The oil lubrication and sealing system for the wind turbine transmission system according to any one of claims 1 to 5, characterized in that: The sealing end cover (4) is made of engineering plastic material.

7. The oil lubrication and sealing system for the wind turbine transmission system according to any one of claims 1 to 5, characterized in that: The contact surfaces of two adjacent end cover plates are plugged together and provided with sealant.

8. The oil lubrication and sealing system for the wind turbine transmission system according to any one of claims 1 to 5, characterized in that: A mounting groove (46) is provided on the rear side of the sealing end cover (4), a sealing ring (7) is provided in the mounting groove (46) to seal between the front side of the bearing seat (5) and the rear side of the sealing end cover (4), and a sealing glue is provided between the front side of the bearing seat (5) and the rear side of the sealing end cover (4).

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