Bidirectional composite sealing device, gear box output shaft sealing structure and wind turbine generator

Abstract

The utility model discloses a bidirectional composite sealing device, gear box output shaft sealing structure and wind turbine, including annular sealing main part, hoop spring, radial seal lip and axial seal lip, the annular sealing main part includes the first main part department of sectional appearance L shape structure, the second main part department of sectional appearance and the third main part department of sectional appearance U, the first main part department includes the outside edge and inside edge of vertical connection, the inside edge of inside edge edge place vertical connection has the second main part department, and the end of second main part department is provided with radial seal lip, the hoop spring for generating radial hoop -tight force is provided with in the position opposite radial seal lip on the second main part department, one end of third main part department is connected with the middle part of inside edge, and its other end is provided with axial seal lip. The utility model can effectively guarantee gear box output shaft when radial runout is bigger under the harsh working condition, can also realize better sealing function, guarantees the normal operation of equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of sealing the output shaft of a wind turbine gearbox, and in particular to a bidirectional composite sealing device, a gearbox output shaft sealing structure, and a wind turbine. Background Technology

[0002] In mechanical design, sealing the ends of rotating shafts (such as the output shaft of a wind turbine gearbox) is one of the key technical challenges. Currently, contact seals widely employ skeleton seals, which achieve radial sealing primarily through the tight contact between the sealing lip and the shaft surface, as well as the radial clamping force of the clamping spring. This type of skeleton seal has a significant drawback: it only provides radial sealing. When the radial runout of the shaft is large, the axial seal is prone to failure, leading to a decline in overall sealing performance and preventing the equipment from operating normally. In harsh operating conditions with significant radial runout, traditional skeleton seal devices are insufficient to meet the requirements. Therefore, there is an urgent need to develop a bidirectional composite sealing device that combines radial and axial sealing functions, which is of great significance for ensuring the stable operation of the gearbox output shaft under complex operating conditions. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a bidirectional composite sealing device, a gearbox output shaft sealing structure and a wind turbine, which can effectively ensure that the gearbox output shaft can achieve a good sealing function even when the radial runout is large under harsh working conditions, thus ensuring the normal operation of the equipment.

[0004] The objective of this utility model can be achieved by adopting the following technical solutions:

[0005] A bidirectional composite sealing device includes an annular sealing body, a clamp spring, a radial sealing lip, and an axial sealing lip. The annular sealing body includes a first main body with an L-shaped cross-section, a second main body with a straight cross-section, and a third main body with a U-shaped cross-section. The first main body includes an outer side and an inner side that are vertically connected. The outer peripheral surface of the outer side is closely attached to the inner peripheral surface of the sealing end cover of the gearbox. The second main body is vertically connected to the inner edge of the inner side. The extension direction of the second main body is the same as that of the outer side, and a radial sealing lip is provided at the end of the second main body. The lip of the radial sealing lip is closely attached to the outer peripheral surface of the output shaft of the gearbox. A clamp spring for generating radial clamping force is provided on the second main body at a position opposite to the radial sealing lip. One end of the third main body is connected to the middle of the inner side, and the other end is provided with an axial sealing lip. The lip of the axial sealing lip is closely attached to the end face of the output shaft.

[0006] Furthermore, the annular sealing body is filled with modified fluororubber.

[0007] Furthermore, an L-shaped metal frame is provided inside the first main body.

[0008] A gearbox output shaft sealing structure includes the aforementioned bidirectional composite sealing device.

[0009] A wind turbine generator set includes the gearbox output shaft sealing structure described above.

[0010] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0011] This utility model's bidirectional composite sealing device achieves axial sealing through the elastic deformation of the axial sealing lip, radial sealing through the radial sealing lip, and radial clamping force through the clamping spring. Even with significant radial runout of the output shaft, it maintains a good sealing effect. Furthermore, the main material of the sealing device is filled modified fluororubber, which possesses excellent properties such as high temperature resistance and wear resistance, making it particularly suitable for high-linear-speed operating conditions. It is highly practical and also offers advantages such as oil sealing and dust sealing. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the bidirectional composite sealing device of this utility model.

[0013] Figure 2 This is a schematic diagram of the gearbox output shaft seal of this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0015] Example 1:

[0016] like Figure 1As shown, this embodiment provides a bidirectional composite sealing device, including an annular sealing body, a clamping spring 5, a radial sealing lip 6, and an axial sealing lip 7. The annular sealing body includes a first main body with an L-shaped cross-section, a second main body 3 with a straight cross-section, and a third main body 4 with a U-shaped cross-section. The first main body includes an outer side 1 and an inner side 2 that are vertically connected, and an L-shaped metal frame is provided inside it. The outer peripheral surface of the outer side 1 is closely attached to the inner peripheral surface of the sealing end cover of the gearbox. The second main body 3 is vertically connected to the inner edge of the inner side 2. The extension direction of the second main body 3 is the same as that of the outer side 1. The extension direction of 1 is the same, and the end of the second main body 3 is provided with a radial sealing lip 6. The lip of the radial sealing lip 6 is closely attached to the outer peripheral surface of the output shaft 8 of the gearbox. Radial sealing is achieved by the radial sealing lip 6. A clamping spring 5 is provided on the second main body 3 at a position opposite to the radial sealing lip 6. The clamping spring 5 generates a radial clamping force to improve the radial sealing effect. One end of the third main body 4 is connected to the middle of the inner side 2, and the other end is provided with an axial sealing lip 7. The lip of the axial sealing lip 7 is closely attached to the end face of the output shaft 8. Axial sealing is achieved by the elastic deformation of the axial sealing lip 7.

[0017] In this embodiment, the annular seal body material is filled with modified fluororubber, which is filled with carbon fiber or graphite, significantly improving its properties. It can withstand high temperatures of 200-250℃, has good wear resistance, and its limiting PV value reaches 53 MPa.m / s.

[0018] Example 2:

[0019] like Figure 2 As shown, this embodiment provides a gearbox output shaft sealing structure, including the bidirectional composite sealing device of Embodiment 1. The output shaft 8 is supported by a tapered roller bearing 9. Due to the large radial clearance of the tapered roller bearing 9, the output shaft 8 experiences significant radial runout, affecting the radial sealing at the output shaft end. Therefore, in this embodiment, a bidirectional composite sealing device is installed inside the sealing end cover 10 on the right side of the tapered roller bearing 9. The radial sealing lip 6 is tightly pressed against the outer circumferential surface of the output shaft 8, while the clamping spring 5 applies clamping force, resulting in a better radial sealing effect. The axial sealing lip 7 is tightly pressed against the end face of the output shaft 8 and undergoes elastic deformation, achieving axial sealing.

[0020] Example 3:

[0021] This embodiment provides a wind turbine generator set, including the gearbox output shaft sealing structure described in Embodiment 2.

[0022] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.

Claims

1. A bidirectional composite seal apparatus, characterized by: The device includes an annular sealing body, a clamping spring, a radial sealing lip, and an axial sealing lip. The annular sealing body comprises a first main body with an L-shaped cross-section, a second main body with a straight cross-section, and a third main body with a U-shaped cross-section. The first main body includes an outer side and an inner side that are vertically connected. The outer peripheral surface of the outer side is closely attached to the inner peripheral surface of the sealing end cover of the gearbox. The second main body is vertically connected to the inner edge of the inner side. The extension direction of the second main body is the same as that of the outer side, and a radial sealing lip is provided at the end of the second main body. The lip of the radial sealing lip is closely attached to the outer peripheral surface of the output shaft of the gearbox. A clamping spring for generating radial clamping force is provided on the second main body at a position opposite to the radial sealing lip. One end of the third main body is connected to the middle of the inner side, and the other end is provided with an axial sealing lip. The lip of the axial sealing lip is closely attached to the end face of the output shaft.

2. The bidirectional composite seal apparatus of claim 1, wherein: The annular sealing body is filled with modified fluororubber.

3. The bidirectional composite seal apparatus of claim 1, wherein: The first main body is equipped with an L-shaped metal frame inside.

4. A gearbox output shaft seal arrangement characterised in that: Includes the bidirectional composite sealing device as described in any one of claims 1 to 3.

5. A wind turbine generator characterized by: Includes the gearbox output shaft sealing structure as described in claim 4.

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