Bidirectional sealing structure for fan main shaft bearing

Abstract

The bidirectional sealing structure comprises an annular supporting body, a radial sealing structure and an axial sealing structure, the annular supporting body is installed on a bearing seat end cover of a fan, the radial sealing structure is arranged at one end of the annular supporting body, and the axial sealing structure is arranged at the other end of the annular supporting body. The radial sealing structure is tightly attached to a baffle ring of a main shaft or a shaft sleeve of the fan to form first-stage sealing, and the axial sealing structure is arranged on the inner side face of the annular supporting body and tightly attached to the main shaft or the shaft sleeve to form second-stage sealing. A first V-shaped groove used for providing effective space for flexible deformation of the axial sealing structure is formed between the axial sealing structure and the radial sealing structure. The main shaft bearing sealing structure can effectively solve the problems that an existing main shaft bearing is prone to failure in sealing, frequent in grease leakage and high in maintenance cost.

Description

Technical Field

[0001] This utility model relates to the technical field of wind turbine main shaft bearings, and in particular to a bidirectional sealing structure for wind turbine main shaft bearings. Background Technology

[0002] In wind power generation equipment, bearings are crucial components of the transmission chain system. Ensuring proper lubrication is key to achieving a long bearing lifespan, making sealing performance paramount. Sealing performance is closely related to the sealing materials and structure. Currently, wind turbine main shaft bearings generally use grease lubrication. This lubricant has poor fluidity, is prone to accumulation and solidification, and currently, main shaft bearing seals typically employ rotating shaft lip seal structures, such as helical spring type, finger spring type, or springless type. Due to wind load and its own weight, these seals undergo deformation. Using rotating shaft lip seals requires a large interference fit, accelerating wear and making it difficult to achieve proper compensation and following, leading to grease leakage during operation. This not only affects the bearing's lubrication effect but also significantly reduces its service life. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a bidirectional sealing structure for the main shaft bearing of a fan, which can effectively solve the problems of easy failure of the seal, frequent grease leakage and high maintenance cost of the existing main shaft bearing.

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

[0005] A bidirectional sealing structure for a fan main shaft bearing includes an annular support, a radial sealing structure, and an axial sealing structure. The annular support is mounted on the bearing housing end cover of the fan. One end of the annular support is provided with a radial sealing structure, which is tightly fitted with the retaining ring of the fan main shaft or bushing to form a first-level seal. The axial sealing structure is located on the inner side of the annular support and is tightly fitted with the main shaft or bushing to form a second-level seal. A first V-groove is provided between the axial sealing structure and the radial sealing structure to provide effective space for the flexible deformation of the axial sealing structure.

[0006] Furthermore, the radial sealing structure includes a first sealing lip, which has a J-shaped structure. One end of the first sealing lip is connected to an annular support, and the other end is tightly fitted to the retaining ring of the main shaft or bushing. A second V-groove is formed between the first sealing lip and the annular support, and the opening direction of the second V-groove is towards the bearing seat end cover.

[0007] Furthermore, the axial sealing structure includes at least one sealing lip, each sealing lip being tightly fitted to the outer circumferential surface of the spindle or bushing.

[0008] Furthermore, a groove for oil storage and lubrication is formed between two adjacent sealing lips.

[0009] Furthermore, the annular support is made of rigid rubber, fabric, metal, or plastic.

[0010] Furthermore, both the radial sealing structure and the axial sealing structure are made of rubber.

[0011] Furthermore, the radial sealing structure and the axial sealing structure are integrally formed.

[0012] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0013] The bidirectional sealing structure of this utility model is simple and novel. By setting radial and axial sealing structures, there is no need to worry about deviations caused by spindle deformation. It can maintain the sealing effect under extreme working conditions, has reliable performance, effectively prevents grease leakage, and achieves the goal of low cost and long service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the bidirectional sealing structure of this utility model.

[0015] Figure 2 This is an assembly diagram of the bidirectional sealing structure of this utility model.

[0016] Figure 3 This is a partially enlarged view of the bidirectional sealing structure of this utility model.

[0017] Figure 4 This is a schematic diagram of the axial sealing structure of this utility model, which has two sealing lips.

[0018] Figure 5 This is a schematic diagram of the axial sealing structure of this utility model, which has a sealing lip. Detailed Implementation

[0019] 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.

[0020] like Figures 1 to 2As shown, this embodiment provides a bidirectional sealing structure for a fan main shaft bearing, including an annular support 1, a radial sealing structure 2, and an axial sealing structure 3. The annular support 1 is installed on the bearing seat end cover 5 of the fan and is in a static state, which facilitates installation and provides support and fixation. One end of the annular support 1 is provided with a radial sealing structure 2, which is tightly fitted with the retaining ring 8 of the fan main shaft 6 or the bushing 7 to form a first-level seal. The axial sealing structure 3 is provided on the inner side of the annular support 1 and is tightly fitted with the main shaft 6 or the bushing 7 to form a second-level seal, preventing leakage of the lubricating medium inside the bearing. A first V-groove 4 is provided between the axial sealing structure 3 and the radial sealing structure 2, which gives the axial sealing structure 3 flexible deformation capability and provides effective space for the deformation of the axial sealing structure 3.

[0021] The radial sealing structure 2 includes a first sealing lip 201, which has a J-shaped structure. One end of the first sealing lip 201 is connected to the annular support 1, and the other end is tightly fitted to the retaining ring 8 of the main shaft 6 or the bushing 7. A second V-groove 202 is formed between the first sealing lip 201 and the annular support 1. The opening direction of the second V-groove 202 is towards the bearing housing end cover 5. By tightly fitting the first sealing lip 201 with the retaining ring 8 of the main shaft 6 or the bushing 7, there is no need to worry about the gap caused by the misalignment of the bearing housing end cover 5 with the main shaft 6 or the bushing 7, nor is there any need to worry about the axial sealing failure caused by the deformation of the main shaft 6, thus achieving a good sealing effect.

[0022] Axial sealing structure 3 includes at least one sealing lip, such as Figures 3 to 5 The diagrams shown are schematics of three sealing lips (sealing lip 301, sealing lip 302 and sealing lip 303), two sealing lips (sealing lip 305 and sealing lip 306), and one sealing lip (sealing lip 307), respectively. Each sealing lip is tightly fitted to the outer circumferential surface of the main shaft 6 or the bushing 7, playing at least one oil sealing role and achieving a good sealing effect. When there are two or more sealing lips, a groove 304 is formed between two adjacent sealing lips. The groove plays the role of storing oil and lubricating the sealing lips.

[0023] The ring support is made of rigid rubber, fabric, metal, or plastic.

[0024] Both the radial and axial sealing structures are made of rubber, preferably HNBR. The radial and axial sealing structures are integrally molded.

[0025] In summary, this utility model improves upon the existing ordinary oil seal, multi-lip seal, and V-type seal structures. It features a simple and novel structure, reliable performance, and completely solves the sealing difficulties encountered during installation, rotation, or under eccentric or unbalanced load conditions. It has practical value for promotion and is worthy of widespread adoption.

[0026] 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 sealing structure for a fan main shaft bearing, characterized in that: The device includes an annular support, a radial sealing structure, and an axial sealing structure. The annular support is mounted on the bearing housing end cover of the fan. One end of the annular support is provided with a radial sealing structure, which is tightly fitted with the retaining ring of the fan's main shaft or bushing to form a first-level seal. The axial sealing structure is located on the inner side of the annular support and is tightly fitted with the main shaft or bushing to form a second-level seal. A first V-groove is provided between the axial sealing structure and the radial sealing structure to provide effective space for the flexible deformation of the axial sealing structure.

2. The bidirectional sealing structure for the main shaft bearing of a wind turbine according to claim 1, characterized in that: The radial sealing structure includes a first sealing lip, which has a J-shaped structure. One end of the first sealing lip is connected to an annular support, and the other end is tightly fitted to the retaining ring of the main shaft or bushing. A second V-shaped groove is formed between the first sealing lip and the annular support, and the opening direction of the second V-shaped groove is towards the bearing seat end cover.

3. The bidirectional sealing structure for the main shaft bearing of a wind turbine according to claim 1, characterized in that: The axial sealing structure includes at least one sealing lip, each sealing lip being tightly fitted to the outer circumferential surface of the spindle or bushing.

4. The bidirectional sealing structure for the main shaft bearing of a wind turbine according to claim 3, characterized in that: A groove for oil storage and lubrication is formed between two adjacent sealing lips.

5. The bidirectional sealing structure for a fan main shaft bearing according to claim 1, characterized in that: The annular support is made of rigid rubber, fabric, metal, or plastic.

6. The bidirectional sealing structure for a fan main shaft bearing according to claim 1, characterized in that: Both the radial sealing structure and the axial sealing structure are made of rubber.

7. The bidirectional sealing structure for a fan main shaft bearing according to claim 1, characterized in that: The radial sealing structure and the axial sealing structure are integrally formed.

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