Sealing device suitable for gear box and wind power gear box

Abstract

The utility model belongs to the technical field of wind power gear boxes, and discloses a sealing device suitable for a gear box and the wind power gear box. The sealing device suitable for the gearbox comprises a sealing ring body and an elastic piece, the sealing ring body is arranged on a transmission shaft in a sleeving mode and connected to a transparent cover assembly, the sealing ring body is an electric conductor, the transmission shaft is in running fit with an installation box body, the transparent cover assembly is fixedly connected with the installation box body, and the installation box body is grounded; the elastic piece is arranged on the sealing ring body and is configured to apply elastic force to the sealing ring body so that the sealing ring body can abut against the transmission shaft. According to the wind power gear box, a current conduction path of the transmission shaft, the sealing ring body, the first transparent cover and the mounting box body can be formed, charges are eliminated through the grounded mounting box body, and therefore the charges on the transmission shaft are eliminated, and shaft voltage is prevented from damaging bearings, gears and other parts in the mounting box body; and the service life of the wind power gear box is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power gear boxes, and in particular to a sealing device suitable for a gear box and a wind power gear box. Background Art

[0002] The generator of a wind turbine generates shaft voltage when in operation, which is transmitted to the gearbox through the drive shaft. When the voltage reaches or exceeds a certain threshold, high-frequency discharge occurs. When the current breaks through the lubricating oil film on the bearings supporting the shaft system and the tooth surface near the generator end, instantaneous high temperature is generated between the bearing rollers and raceways, and on the meshing surfaces of the gears, causing local damage to the bearing surfaces and gear tooth surfaces, greatly reducing the life of the bearings and gears.

[0003] Currently, carbon brushes or insulated bearings are generally used in gearboxes to solve the above problems. However, carbon brush structures are difficult to maintain and inconvenient to disassemble and assemble, while the insulation layer of insulated bearings is easily damaged during installation and use, resulting in the inability to provide effective protection. Utility Model Content

[0004] The purpose of the utility model is to provide a sealing device suitable for a gear box and a wind power gear box, which can eliminate the electric charge on the transmission shaft and prevent the shaft voltage from causing damage to the inside of the wind power gear box.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Seals for gearboxes, including:

[0007] A sealing ring body, which is sleeved on the transmission shaft and connected to the transparent cover assembly. The sealing ring body is a conductor. The transmission shaft and the mounting box are rotatably engaged. The transparent cover assembly is fixedly connected to the mounting box. The mounting box is grounded.

[0008] An elastic member is provided on the sealing ring body, and the elastic member is configured to apply elastic force to the sealing ring body so that the sealing ring body abuts against the transmission shaft.

[0009] Preferably, the sealing ring body includes a first ring wall, a second ring wall and a connecting portion, the second ring wall is connected to the first ring wall through the connecting portion, the first ring wall abuts against the outer peripheral surface of the transmission shaft, the second ring wall is connected to the transparent cover assembly, and the elastic member is arranged on the side of the first ring wall away from the transmission shaft.

[0010] Preferably, the elastic member is arranged in an annular shape along the circumference of the first annular wall; or, the elastic member is sandwiched between the first annular wall and the second annular wall.

[0011] Preferably, an annular groove is provided on a side of the first annular wall facing away from the transmission shaft, and the elastic member is clamped in the annular groove.

[0012] Preferably, a plurality of protrusions are provided on the first ring wall, and the protrusions abut against the outer peripheral surface of the transmission shaft.

[0013] Preferably, a conductive wear-resistant layer is provided on the protrusion.

[0014] Preferably, a support frame is provided inside the sealing ring body, and the support frame is provided through the second ring wall and the connecting portion.

[0015] Preferably, the transparent cover assembly includes a first transparent cover and a second transparent cover, the second transparent cover is arranged between the first transparent cover and the installation box, the inner wall of the first transparent cover is provided with a mounting groove, and the sealing ring body is arranged in the mounting groove.

[0016] Preferably, along the axial direction of the transmission shaft, the depth of the mounting groove is not less than the thickness of the sealing ring body.

[0017] A wind power gearbox comprises a mounting box, a transmission shaft, a transparent cover assembly and the above-mentioned sealing device applicable to the gearbox.

[0018] The beneficial effects of the present invention are:

[0019] The utility model provides a sealing device suitable for a gearbox, wherein a sealing ring body is sleeved on the transmission shaft and connected to the transparent cover assembly. Since an elastic member is provided on the sealing ring body, the elastic member can apply elastic force to the sealing ring body so that the sealing ring body surrounds the transmission shaft and abuts against the outer wall surface of the transmission shaft. Therefore, the sealing ring body can form a seal between the transmission shaft and the transparent cover assembly, effectively preventing the lubricating oil in the installation box from leaking through the transmission shaft, and further improving the sealing performance of the wind power gearbox; since the sealing ring body is a conductor, and the sealing ring body is connected to the transmission shaft and the transparent cover assembly, the shaft voltage generated by the generator will be conducted through the transmission shaft-sealing ring body-transparent cover assembly-installation box, and finally the charge will be eliminated through the grounded installation box, thereby eliminating the charge on the transmission shaft, avoiding the shaft voltage from causing damage to bearings, gears and other components inside the installation box, and effectively extending the service life of the wind power gearbox.

[0020] The wind turbine gearbox provided by the present invention adopts the above-mentioned sealing device suitable for the gearbox, which can effectively eliminate the electric charge transmitted by the generator to prevent the shaft voltage from damaging the bearings, gears and other components inside the installation box, thereby effectively extending the service life of the wind turbine gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a cross-sectional view of a wind turbine gearbox provided by a specific embodiment of the present utility model;

[0022] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0023] In the picture:

[0024] 100-drive shaft;

[0025] 200-install the cabinet;

[0026] 300-first transparent cover; 310-installation slot;

[0027] 400 - second transparent cover; 410 - oil return chamber;

[0028] 1-sealing ring body; 11-first ring wall; 111-protrusion; 12-second ring wall; 13-connecting portion; 14-support frame;

[0029] 2- Elastic piece. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] like Figure 1 and Figure 2 As shown, the utility model provides a sealing device suitable for a gear box, which includes a sealing ring body 1 and an elastic member 2. The sealing ring body 1 is sleeved on the transmission shaft 100 and connected to the transparent cover assembly. The sealing ring body 1 is a conductor. The transmission shaft 100 and the mounting box body 200 are rotatably matched. The transparent cover assembly is fixedly connected to the mounting box body 200, and the mounting box body 200 is grounded. The elastic member 2 is provided on the sealing ring body 1, and the elastic member 2 is configured to apply elastic force to the sealing ring body 1 so that the sealing ring body 1 abuts against the transmission shaft 100. In this embodiment, the sealing ring body 1 is sleeved on the transmission shaft 100 and connected to the transparent cover assembly. Since the sealing ring body 1 is provided with an elastic member 2, the elastic member 2 can apply elastic force to the sealing ring body 1 so that the sealing ring body 1 surrounds the transmission shaft 100 and abuts against the outer wall of the transmission shaft 100. Therefore, the sealing ring body 1 can form a seal between the transmission shaft 100 and the transparent cover assembly, effectively preventing the lubricating oil in the mounting box 200 from leaking through the transmission shaft 100, further improving the sealing performance of the wind turbine gearbox; since the sealing ring body 1 is a conductor, and the sealing ring body 1 is connected to the transmission shaft 100 and the transparent cover assembly, the shaft voltage generated by the generator will be conducted through the transmission shaft 100-sealing ring body 1-transparent cover assembly-mounting box 200, and finally the charge will be eliminated through the grounded mounting box 200, thereby eliminating the charge on the transmission shaft 100, avoiding the shaft voltage from damaging the bearings, gears and other components inside the mounting box 200, and effectively extending the service life of the wind turbine gearbox.

[0035] Specifically, the sealing ring body 1 is made of conductive rubber, which is a composite conductive material commonly used in the art. Its main material is rubber, and conductive metals such as silver-plated aluminum and silver are evenly distributed inside, and it has good conductive properties.

[0036] The structure of the sealing ring body 1 can be set according to actual needs, as long as it can ensure contact with the transmission shaft 100. For example, Figure 2As shown, the sealing ring body 1 includes a first annular wall 11, a second annular wall 12, and a connecting portion 13. The second annular wall 12 is connected to the first annular wall 11 via the connecting portion 13. The first annular wall 11 abuts the outer circumference of the transmission shaft 100. The second annular wall 12 is connected to the transparent cover assembly. The elastic member 2 is disposed on the side of the first annular wall 11 away from the transmission shaft 100. The diameter of the second annular wall 12 is greater than that of the first annular wall 11. The first and second annular walls 11, 12 are connected by the connecting portion 13, which not only ensures the integrity of the sealing ring body 1, but also allows the first and second annular walls 11, 12 to be spaced apart, providing space for the elastic member 2 and ensuring stable contact between the sealing ring body 1 and the transmission shaft 100.

[0037] The connection portion 13 can be located in the middle of the axial direction of the first annular wall 11 or at an axial edge of the first annular wall 11, as long as a stable connection between the first annular wall 11 and the second annular wall 12 is ensured. Exemplarily, the connection portion 13 is located at an axial edge of the first annular wall 11 and close to the outside. The cross-section of the sealing ring body 1 is U-shaped, with the opening of the U facing inward.

[0038] The elastic member 2 is provided to enable the sealing ring body 1 to fully abut against the transmission shaft 100, specifically to enable the first annular wall 11 to fully abut against the transmission shaft 100. Exemplarily, the elastic member 2 is provided in an annular shape along the circumference of the first annular wall 11; or, the elastic member 2 is clamped between the first annular wall 11 and the second annular wall 12. In this embodiment, the elastic member 2 is an annular spring, and the elastic member 2 is clamped on the first annular wall 11 along the circumference of the sealing ring body 1. The elastic member 2 can apply an elastic force to the first annular wall 11, so that the first annular wall 11 shrinks inward and is clamped on the transmission shaft 100. Specifically, before installing the elastic member 2 on the first annular wall 11, the staff first processes the elastic member 2 according to the preset interference fit, so that the elastic force of the elastic member 2 can meet the interference fit requirement when the sealing ring body 1 and the transmission shaft 100 are assembled. In another embodiment, the elastic member 2 is a common compression spring, and the elastic member 2 is sandwiched between the first annular wall 11 and the second annular wall 12 , with both ends of the elastic member 2 respectively abutting against the first annular wall 11 and the second annular wall 12 .

[0039] like Figure 2 As shown, an annular groove is provided on the side of the first annular wall 11 facing away from the transmission shaft 100, and the elastic member 2 is clamped in the annular groove. By clamping the elastic member 2 in the annular groove, the stability of the assembly of the elastic member 2 and the first annular wall 11 is ensured, and the elastic member 2 is prevented from shifting.

[0040] like Figure 2As shown, the first annular wall 11 is provided with a plurality of protrusions 111, which abut against the outer peripheral surface of the transmission shaft 100. By providing the protrusions 111, the contact area between the first annular wall 11 and the transmission shaft 100 is reduced, preventing increased wear of the first annular wall 11 and the transmission shaft 100 due to an excessively large contact area, thereby extending the service life of the sealing ring body 1 and the transmission shaft 100.

[0041] Furthermore, a conductive wear-resistant layer is provided on the protrusion 111 to enhance the wear resistance of the protrusion 111. In this embodiment, the wear-resistant layer is made of conductive polytetrafluoroethylene. The main material is polytetrafluoroethylene, and conductive metals such as silver-plated aluminum and silver are evenly distributed inside, thereby having good electrical conductivity. Polytetrafluoroethylene has high lubricity and good wear resistance, which can reduce the friction between the transmission shaft 100 and the first ring wall 11 during rotation. Therefore, while ensuring the good electrical conductivity of the sealing ring body 1, it also reduces the friction loss between the sealing ring body 1 and the transmission shaft 100.

[0042] like Figure 2 As shown, a support frame 14 is provided within the sealing ring body 1, extending through the second ring wall 12 and the connecting portion 13. The support frame 14 is provided within the sealing ring body 1 to support the entire sealing ring body 1 and provide a certain degree of strength. In this embodiment, the support frame 14 is made of metal. In another embodiment, the support frame 14 is made of hard plastic.

[0043] The support frame 14 extends through the second annular wall 12 and the connecting portion 13, making the shape of the support frame 14 identical to the shape of the second annular wall 12 and the connecting portion 13, thereby increasing the support area. The support frame 14 is not provided in the first annular wall 11 to prevent the first annular wall 11 from being too strong and affecting the fit with the transmission shaft 100.

[0044] The transparent cover assembly may include one transparent cover or two transparent covers. Figure 1 and Figure 2 As shown, the transparent cover assembly includes a first transparent cover 300 and a second transparent cover 400. The second transparent cover 400 is disposed between the first transparent cover 300 and the mounting box 200. A mounting groove 310 is formed on the inner wall of the first transparent cover 300, and the sealing ring body 1 is disposed in the mounting groove 310. By disposing the sealing ring body 1 in the mounting groove 310, the stability and reliability of the assembly of the sealing ring body 1 and the first transparent cover 300 can be effectively improved.

[0045] In this embodiment, the first transparent cover 300 and the second transparent cover 400 are detachably connected by bolts, and the second transparent cover 400 is connected to the mounting box 200 by bolts. An oil return chamber 410 is provided between the first transparent cover 300 and the second transparent cover 400. The oil return chamber 410 is used to accommodate lubricating oil leaked from the inside of the mounting box 200. The oil return chamber 410 is connected to the oil return pipeline, so that the leaked lubricating oil can return to the oil tank through the oil return pipeline. The first transparent cover 300 and the second transparent cover 400 cooperate to form a double-layer seal and protection for the wind turbine gearbox, and effectively reduce the leakage of lubricating oil.

[0046] Specifically, the mounting groove 310 is arranged on the side of the first transparent cover 300 away from the second transparent cover 400 and located on the inner wall of the first transparent cover 300, so that the outer peripheral surface of the sealing ring body 1 abuts against the inner wall of the mounting groove 310, further improving the support stability of the sealing ring body 1.

[0047] Along the axial direction of the transmission shaft 100, the depth of the mounting groove 310 is not less than the thickness of the sealing ring body 1, so the sealing ring body 1 can be completely installed in the mounting groove 310, avoiding the end of the sealing ring body 1 being exposed from the first transparent cover 300 and damaged, thereby providing good protection for the sealing ring body 1.

[0048] When installing the sealing device suitable for the gear box, it is necessary to first place the sealing device suitable for the gear box into the installation groove 310, and the sealing ring body 1 is interference fit with the first transparent cover 300 and is stuck in the installation groove 310. At this time, the sealing device suitable for the gear box and the first transparent cover 300 are assembled into an integral structure; then the first transparent cover 300 and the sealing device suitable for the gear box are installed on the transmission shaft 100 together, and the sealing ring body 1 is interference fitted on the transmission shaft 100 under the elastic force of the elastic member 2, and finally the first transparent cover 300 and the second transparent cover 400 are fixedly connected, thereby completing the installation of the sealing device suitable for the gear box.

[0049] This embodiment further provides a wind turbine gearbox, comprising a mounting housing 200, a transmission shaft 100, a transparent cover assembly, and the aforementioned sealing device for the gearbox. In this embodiment, the sealing device for the gearbox is disposed on the transparent cover assembly, and a sealing ring body 1 of the sealing device for the gearbox abuts and rotates with the transmission shaft 100. Since the sealing ring body 1 is made of a conductive material, the wind turbine gearbox forms a grounded current conduction path from the transmission shaft 100 - the sealing ring body 1 - the transparent cover assembly - the mounting housing 200. The charge transferred by the generator through the transmission shaft 100 is discharged from the wind turbine gearbox through this conduction path, preventing shaft voltage from damaging components such as bearings and gears within the mounting housing 200, thereby effectively extending the service life of the wind turbine gearbox. Furthermore, the sealing device for the gearbox is wound around the transmission shaft 100 and forms a contact seal with the transmission shaft 100, thereby further improving the sealing performance of the wind turbine gearbox.

[0050] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A sealing device suitable for a gear box, characterized in that: include: A sealing ring body (1), the sealing ring body (1) is sleeved on the transmission shaft (100) and connected to the transparent cover assembly, the sealing ring body (1) is a conductor, the transmission shaft (100) and the installation box (200) are rotatably matched, the transparent cover assembly and the installation box (200) are fixedly connected, and the installation box (200) is grounded; An elastic member (2), the elastic member (2) being arranged on the sealing ring body (1), the elastic member (2) being configured to apply an elastic force to the sealing ring body (1) so as to cause the sealing ring body (1) to abut against the transmission shaft (100).

2. The sealing device for a gear box according to claim 1, characterized in that: The sealing ring body (1) comprises a first ring wall (11), a second ring wall (12) and a connecting portion (13); the second ring wall (12) is connected to the first ring wall (11) via the connecting portion (13); the first ring wall (11) abuts against the outer peripheral surface of the transmission shaft (100); the second ring wall (12) is connected to the transparent cover assembly; and the elastic member (2) is arranged on a side of the first ring wall (11) away from the transmission shaft (100).

3. The sealing device for a gear box according to claim 2, characterized in that: The elastic member (2) is arranged in an annular shape along the circumference of the first annular wall (11); or, the elastic member (2) is sandwiched between the first annular wall (11) and the second annular wall (12).

4. The sealing device for a gear box according to claim 3, characterized in that: An annular groove is provided on the side of the first annular wall (11) facing away from the transmission shaft (100), and the elastic member (2) is clamped in the annular groove.

5. The sealing device for a gear box according to claim 2, characterized in that: A plurality of protrusions (111) are provided on the first ring wall (11), and the protrusions (111) abut against the outer peripheral surface of the transmission shaft (100).

6. The sealing device for a gear box according to claim 5, characterized in that: A conductive wear-resistant layer is provided on the protrusion (111).

7. The sealing device for a gear box according to claim 2, characterized in that: A support frame (14) is provided inside the sealing ring body (1), and the support frame (14) is provided through the second ring wall (12) and the connecting portion (13).

8. The sealing device for a gear box according to any one of claims 1 to 7, characterized in that: The transparent cover assembly comprises a first transparent cover (300) and a second transparent cover (400), wherein the second transparent cover (400) is arranged between the first transparent cover (300) and the installation box (200), and an installation groove (310) is provided on the inner wall of the first transparent cover (300), and the sealing ring body (1) is arranged in the installation groove (310).

9. The sealing device for a gear box according to claim 8, characterized in that: Along the axial direction of the transmission shaft (100), the depth of the mounting groove (310) is not less than the thickness of the sealing ring body (1).

10. Wind power gearbox, characterized in that, The invention comprises a mounting box body (200), a transmission shaft (100), a transparent cover assembly, and a sealing device applicable to a gear box as claimed in any one of claims 1 to 9.

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