A main shaft sealing device for use in a wind turbine

Abstract

The utility model provides a kind of main shaft sealing device for wind turbine unit, it is related to main shaft sealing technical field.This kind of main shaft sealing device for wind turbine unit, including bearing seat, the inside rotation of bearing seat is equipped with main shaft, and the one end of bearing seat is provided with end cover;Sealing component, sealing component is arranged in the inside of end cover.This application when staff threadedly connects protective ring in the inside of installation groove, sealing ring can preliminarily seal between main shaft and end cover at this time, to avoid the air or water vapor outside end cover to try to invade the inside of end cover from outside, to improve the sealing effect of end cover to bearing seat, when staff first sealing ring is set together with main shaft activity, at this time, the pre-pressure that wave spring releases to inside can be extruded to first sealing ring by connecting ring, so that the inner wall surface of first sealing ring and the outer wall surface of main shaft can be closely fitted together, to avoid the leakage of oil in bearing seat.

Description

Technical Field

[0001] This application relates to the field of spindle sealing technology, and more particularly to a spindle sealing device for use in wind turbine generators. Background Technology

[0002] A wind turbine is a device that converts wind energy into electrical energy, mainly composed of blades, a generator, mechanical components, and electrical components. Because wind turbines are installed high in the air, maintenance and repair are quite difficult. With increasing capacity, the complexity of the units also increases. To ensure safe operation, reducing leakage is a crucial aspect of wind turbine maintenance. Components involving sealing in wind turbines include: main shaft bearings, main gearbox, yaw reducer, pitch reducer, yaw bearings, and pitch bearings. Leaks of lubricating grease and hydraulic oil caused by seal failure not only affect civilized production and have a certain impact on the environment, but also pose safety hazards, easily leading to accidents such as fires. Due to the difficulty of wind turbine maintenance, solving leakage problems has always been a challenge.

[0003] Currently, some early and mid-stage wind turbines are experiencing wear and tear during use, which significantly reduces the sealing performance of the original main shaft seals, leading to varying degrees of leakage. For these wind turbines, since the early structural design has been finalized and the units have already been installed on the tower top, it is impossible to reinstall new sealing devices. The only solution is to continuously maintain the turbines to mitigate the leakage. Utility Model Content

[0004] This application provides a main shaft sealing device for wind turbine units to address the issue that, for some early and mid-stage wind turbines, the original main shaft sealing device's sealing performance is significantly reduced due to wear during use, resulting in varying degrees of leakage. For these wind turbine units, since the early structural design is already finalized and the unit has been installed on the tower top, it is impossible to reinstall a new sealing device; the only solution is to continuously maintain the unit to mitigate the leakage problem.

[0005] This application provides a main shaft sealing device for wind turbine generators, comprising: A bearing housing, in which a main shaft is rotatably mounted, and an end cap is provided at one end of the bearing housing; The mounting groove is formed at one end of the end cap, and a protective ring is threaded into the inside of the mounting groove; A sealing ring is fixedly connected to one end of the protective ring, and the sealing ring is movably sleeved with the main shaft; A sealing component, disposed inside the end cap, is used to seal the bearing housing.

[0006] Preferably, the sealing component includes: A control groove is formed on the inner wall of the end cap, and a wave spring is fixedly connected inside the control groove; A connecting ring is fixedly connected to the inner wall of the wave spring, and a first sealing ring is fixedly connected to the inner wall of the connecting ring. The first sealing ring is movably sleeved together with the main shaft.

[0007] Preferably, the inner wall of the end cap is provided with a placement groove, and an installation ring is movably sleeved inside the placement groove. A second sealing ring is fixedly connected inside the installation ring, and the second sealing ring is movably sleeved together with the main shaft.

[0008] Preferably, one end of the bearing housing is fixedly connected to several fixing rods, and one end of the end cover is provided with several fixing holes. The fixing holes are movably fitted together with the fixing rods, and the outer wall surface of the fixing rods is threaded with nuts.

[0009] Preferably, a sealing groove is provided at one end of the end cap, and a sealing gasket is fixedly connected inside the sealing groove.

[0010] Preferably, the inner wall of the end cap is provided with a drain hole, and a one-way valve is fixedly connected inside the drain hole.

[0011] Beneficial effects: Considering that for some early and mid-stage wind turbines, wear and tear during use significantly reduces the sealing performance of the original shaft seals, leading to varying degrees of leakage, and given that the early structural design of these turbines is already finalized and the units are already installed on the tower, it's impossible to install new seals. The only solution is continuous maintenance to mitigate leakage. By installing end caps, after adding oil to the bearing housing, the end caps are fixed to one end of the housing. This sealing component seals the end caps against the shaft, preventing oil from leaking out through the shaft and thus improving the main shaft seal of the wind turbine. The sealing mechanism reduces oil leakage. Simultaneously, by incorporating a protective ring, when the operator threads the protective ring into the mounting groove, the sealing ring initially seals the space between the spindle and the end cover, preventing external air or moisture from entering the end cover and thus improving the sealing effect of the end cover on the bearing housing. Furthermore, by using a wave spring, when the operator movably fits the first sealing ring onto the spindle, the pre-pressure released by the wave spring compresses the first sealing ring through the connecting ring, ensuring a tight fit between the inner wall of the first sealing ring and the outer wall of the spindle. This prevents oil leakage from the bearing housing and reduces the need for bearing housing maintenance.

[0012] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional structural diagram of a main shaft sealing device for wind turbine units according to the present invention.

[0015] Figure 2 This is a schematic diagram of the protective ring structure of a main shaft sealing device for wind turbine units according to the present invention.

[0016] Figure 3 This is a schematic diagram of the mounting ring structure of a main shaft sealing device for wind turbine units according to the present invention.

[0017] Figure 4 This is a schematic diagram of the connecting ring structure of a main shaft sealing device for wind turbine units according to the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Bearing housing; 2. Main shaft; 3. End cover; 4. Mounting groove; 5. Protective ring; 6. Sealing ring; 7. Control groove; 8. Wave spring; 9. Connecting ring; 10. First sealing ring; 11. Placement groove; 12. Mounting ring; 13. Second sealing ring; 14. Fixing rod; 15. Fixing hole; 16. Nut; 17. Sealing groove; 18. Sealing gasket; 19. Drain hole; 20. Check valve. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0021] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0025] This utility model provides, for example Figure 1-4The main shaft sealing device shown includes a bearing housing 1, a main shaft 2 rotatably mounted inside the bearing housing 1, an end cover 3 provided at one end of the bearing housing 1, an installation groove 4 provided at one end of the end cover 3, a protective ring 5 threadedly connected inside the installation groove 4, a sealing ring 6 fixedly connected to one end of the protective ring 5, the sealing ring 6 being movably sleeved with the main shaft 2, and a sealing component provided inside the end cover 3 for sealing the bearing housing 1.

[0026] By setting up end cap 3, after the operator adds oil to the bearing housing 1, the end cap 3 is fixed to one end of the bearing housing 1. By using a sealing component, the end cap 3 and the main shaft 2 can be sealed, thereby preventing the oil in the bearing housing 1 from flowing out through the main shaft 2. This seals the main shaft 2 of the wind turbine generator set and reduces oil leakage. At the same time, by setting up protective ring 5, after the operator threaded the protective ring 5 into the mounting groove 4, the sealing ring 6 can initially seal the main shaft 2 and the end cap 3, thereby preventing air or moisture from outside the end cap 3 from attempting to enter the interior of the end cap 3, thus improving the sealing effect of the end cap 3 on the bearing housing 1.

[0027] The sealing component includes a control groove 7, which is formed on the inner wall of the end cover 3. A wave spring 8 is fixedly connected inside the control groove 7. A connecting ring 9 is fixedly connected to the inner wall of the wave spring 8. A first sealing ring 10 is fixedly connected to the inner wall of the connecting ring 9. The first sealing ring 10 is movably sleeved together with the main shaft 2.

[0028] In this design, by setting a wave spring 8, when the operator moves the first sealing ring 10 together with the main shaft 2, the pre-pressure released by the wave spring 8 can squeeze the first sealing ring 10 through the connecting ring 9, so that the inner wall surface of the first sealing ring 10 can be tightly fitted with the outer wall surface of the main shaft 2, thereby preventing the leakage of oil in the bearing seat 1.

[0029] The inner wall of the end cap 3 is provided with a placement groove 11. An installation ring 12 is movably fitted inside the placement groove 11. A second sealing ring 13 is fixedly connected inside the installation ring 12. The second sealing ring 13 is movably fitted together with the main shaft 2.

[0030] By setting a second sealing ring 13, which works in conjunction with the first sealing ring 10, the sealing effect on the spindle 2 can be further improved. At the same time, the second sealing ring 13 and the first sealing ring 10 can be replaced after long-term use, thereby improving the sealing quality of the end cover 3 on the bearing seat 1 and the spindle 2.

[0031] A number of fixing rods 14 are fixedly connected to one end of the bearing housing 1, and a number of fixing holes 15 are opened at one end of the end cover 3. The fixing holes 15 and the fixing rods 14 are movably fitted together, and nuts 16 are threadedly connected to the outer wall surface of the fixing rods 14.

[0032] By setting a nut 16, when the nut 16 is threadedly connected to the fixing rod 14, the end cover 3 can be fixed to one end of the bearing seat 1, and the end cover 3 can be disassembled.

[0033] A sealing groove 17 is provided at one end of the end cap 3, and a sealing gasket 18 is fixedly connected inside the sealing groove 17.

[0034] By setting a sealing gasket 18, when the end cover 3 is fixed to one end of the bearing housing 1, the sealing gasket 18 can seal the space between the end cover 3 and the bearing housing 1.

[0035] The inner wall of the end cap 3 is provided with a drain hole 19, and a one-way valve 20 is fixedly connected inside the drain hole 19.

[0036] Among them, by setting a one-way valve 20, the grease accumulated or excess in the end cap 3 can flow out by opening the one-way valve 20.

[0037] Working Principle: This main shaft sealing device for wind turbines uses an end cap 3. After adding oil to the bearing housing 1, the end cap 3 is fixed to one end of the bearing housing 1. The sealing component seals the end cap 3 against the main shaft 2, preventing oil from leaking out of the bearing housing 1 through the main shaft 2. This seals the main shaft 2 of the wind turbine, reducing oil leakage. Simultaneously, a protective ring 5 is installed. When the protective ring 5 is threaded into the mounting groove 4, the sealing ring 6 initially seals the main shaft. A seal is formed between shaft 2 and end cover 3 to prevent air or moisture from outside end cover 3 from attempting to enter the interior of end cover 3, thereby improving the sealing effect of end cover 3 on bearing housing 1. By setting wave spring 8, when the operator moves the first sealing ring 10 together with the main shaft 2, the pre-pressure released by wave spring 8 can squeeze the first sealing ring 10 through connecting ring 9, so that the inner wall surface of the first sealing ring 10 can be tightly fitted with the outer wall surface of the main shaft 2, thereby preventing oil leakage in bearing housing 1 and reducing maintenance of bearing housing 1.

[0038] By setting a second sealing ring 13, which works in conjunction with the first sealing ring 10, the sealing effect on the spindle 2 can be further improved. Furthermore, the second sealing ring 13 and the first sealing ring 10 can be replaced after long-term use, thereby improving the sealing quality of the end cover 3 between the bearing housing 1 and the spindle 2. By setting a nut 16, when the nut 16 is threadedly connected to the fixing rod 14, the end cover 3 can be fixed to one end of the bearing housing 1. Simultaneously, the end cover 3 can be disassembled. By setting a sealing gasket 18, when the end cover 3 is fixed to one end of the bearing housing 1, the sealing gasket 18 can seal between the end cover 3 and the bearing housing 1.

[0039] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A main shaft sealing arrangement for use in a wind turbine generator, characterized by, include: A bearing housing (1) is provided with a main shaft (2) rotatably mounted inside the bearing housing (1), and an end cap (3) is provided at one end of the bearing housing (1). Mounting groove (4), the mounting groove (4) is opened at one end of the end cap (3), and a protective ring (5) is threaded inside the mounting groove (4); A sealing ring (6) is fixedly connected to one end of the protective ring (5), and the sealing ring (6) is movably sleeved with the main shaft (2); A sealing component is disposed inside the end cap (3) for sealing the bearing housing (1).

2. The main shaft sealing device for wind turbine units according to claim 1, characterized in that: The sealing component includes: Control groove (7), the control groove (7) is opened on the inner wall surface of the end cover (3), and a wave spring (8) is fixedly connected inside the control groove (7); A connecting ring (9) is fixedly connected to the inner wall of the wave spring (8). A first sealing ring (10) is fixedly connected to the inner wall of the connecting ring (9). The first sealing ring (10) is movably sleeved together with the main shaft (2).

3. The main shaft sealing device for wind turbine units according to claim 1, characterized in that: The inner wall of the end cap (3) is provided with a placement groove (11), and an installation ring (12) is movably fitted inside the placement groove (11). A second sealing ring (13) is fixedly connected inside the installation ring (12), and the second sealing ring (13) is movably fitted together with the main shaft (2).

4. A main shaft sealing device for wind turbine units according to claim 1, characterized in that: One end of the bearing seat (1) is fixedly connected to several fixing rods (14), and one end of the end cover (3) is provided with several fixing holes (15). The fixing holes (15) are movably sleeved together with the fixing rods (14), and the outer wall surface of the fixing rods (14) is threaded with nuts (16).

5. A main shaft sealing device for wind turbine units according to claim 1, characterized in that: One end of the end cap (3) is provided with a sealing groove (17), and a sealing gasket (18) is fixedly connected inside the sealing groove (17).

6. A main shaft seal for use in a wind turbine generator as defined in claim 1, wherein: The inner wall of the end cap (3) is provided with a drain hole (19), and a one-way valve (20) is fixedly connected inside the drain hole (19).

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