Novel shaft sealing structure

Abstract

The utility model discloses a novel shaft sealing structure, which relates to the technical field of shaft sealing and comprises a rotary sealing element, the rotary sealing element consists of a first mounting base ring, a hard base ring, a rubber corrugated pipe, a first annular rubber sealing plate and a sealing spring, the hard base ring is fixedly sleeved on the first mounting base ring, and the rubber corrugated pipe is sleeved on the first annular rubber sealing plate. The two rubber corrugated pipes are fixedly installed at the two ends of the first installation base ring respectively, the two first annular rubber sealing plates are fixedly installed at one ends of the two rubber corrugated pipes respectively, the two sealing springs are located between the hard base ring and the first annular rubber sealing plates, and the rotary sealing piece is rotationally installed in the fixed sealing piece. By arranging the shaft sealing structure composed of the rotary sealing piece and the fixed sealing piece, the displacement of the shaft during radial jumping or axial movement is effectively compensated by utilizing the elastic deformation capacity of the rubber corrugated pipe and the sealing spring, and it is ensured that sealing interfaces are tightly attached all the time.

Description

Technical Field

[0001] This utility model relates to the field of shaft sealing technology, and in particular to a novel shaft sealing structure. Background Technology

[0002] In mechanical transmission systems, shaft seals are crucial components preventing lubricant leakage and external contaminant intrusion, and are widely used in rotating equipment such as pumps, compressors, and speed reducers. Traditional shaft seals primarily employ packing seals, mechanical seals, or rubber lip seals. However, these methods still present several problems in practical applications: Insufficient dynamic sealing performance: Under high-speed rotation or frequent start-stop conditions, traditional seals are prone to aging and deformation of the sealing material due to frictional heat, leading to leakage. Limited compensation capability: Rigid seals struggle to adapt to radial or axial runout, resulting in increased sealing gaps and reduced sealing effectiveness. Severe wear: Mechanical seals or packing seals are prone to failure due to frictional wear during long-term operation, requiring frequent maintenance or replacement and increasing operating costs. Poor adaptability to complex operating conditions: In high-temperature, high-pressure, or corrosive media environments, the durability and stability of traditional sealing materials are insufficient, affecting the long-term reliable operation of equipment. To address these issues, some improved solutions have been developed, such as using spring-loaded mechanical seals or combined sealing structures. However, these solutions still suffer from drawbacks such as complex structure, difficult installation, or high cost, making it difficult to balance economic efficiency and ease of maintenance while ensuring sealing performance. Therefore, there is an urgent need for a new type of shaft seal structure that can maintain stable sealing performance under dynamic operating conditions and has good self-adaptive compensation capabilities to extend service life and reduce maintenance costs. Utility Model Content

[0003] The main objective of this invention is to provide a novel shaft sealing structure that can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A novel shaft seal structure includes a rotary seal, which comprises a first mounting base ring, a hard base ring, rubber bellows, a first annular rubber sealing plate, and sealing springs. The hard base ring is fixedly sleeved on the first mounting base ring. There are two rubber bellows, each fixedly installed at one end of the first mounting base ring. There are two first annular rubber sealing plates, each fixedly installed at one end of one of the two rubber bellows. There are two sealing springs, each located between the hard base ring and the first annular rubber sealing plate. The rotary seal is rotatably installed within a fixed seal, which comprises a second mounting base ring and a second annular rubber sealing plate. There are two second annular rubber sealing plates, symmetrically fixedly installed on the inner wall of the second mounting base ring. Annular rubber sealing airbags are installed within the first and second annular rubber sealing plates, and the annular rubber sealing airbags are movably connected to the first and second annular rubber sealing plates.

[0006] Preferably, the sealing spring on the rotary seal is sleeved on the outside of the rubber bellows, and the sealing spring is fixedly connected to the hard base ring and the first annular rubber sealing plate.

[0007] Preferably, the outer end of the first annular rubber sealing plate on the rotary seal is provided with a first annular sealing groove.

[0008] Preferably, the inner end of the second annular rubber sealing plate on the fixed sealing member is provided with a second annular sealing groove.

[0009] Preferably, the second mounting base ring on the fixed seal is sleeved on the outside of the rotary seal, and the two second annular rubber sealing plates are respectively located on both sides of the rotary seal.

[0010] Preferably, the annular rubber sealing airbag is rotatably installed in the first annular sealing groove opened at the outer end of the first annular rubber sealing plate and the second annular sealing groove opened at the inner end of the second annular rubber sealing plate.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] By setting up a shaft sealing structure composed of rotating and fixed seals, the elastic deformation capacity of the rubber bellows and sealing springs effectively compensates for the displacement of the shaft during radial runout or axial movement, ensuring that the sealing interface is always tightly fitted. The movable connection design between the annular rubber sealing airbag and the first and second annular rubber sealing plates further enhances the adaptive sealing performance under dynamic operating conditions and reduces the risk of aging and leakage caused by frictional heat. The combination of the hard base ring and the rubber bellows provides structural stability, reduces wear, and extends service life. The matching design of the first and second annular sealing grooves optimizes the sealing contact surface and improves the sealing reliability in high-pressure, high-temperature, or corrosive media environments. Ultimately, the overall structure simplifies the installation and maintenance process while ensuring efficient sealing, significantly reducing operating costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the present invention;

[0015] Figure 3 For the present utility model Figure 2 A magnified view of point A;

[0016] Figure 4 This is a structural schematic diagram of the fixing seal of this utility model;

[0017] Figure 5 This is a schematic diagram of the disassembled rotary seal and annular rubber sealing airbag of this utility model.

[0018] In the figure: 1. Rotary seal; 2. Fixed seal; 3. Annular rubber sealing airbag; 4. First mounting base ring; 5. Hard base ring; 6. Rubber bellows; 7. First annular rubber sealing plate; 8. Sealing spring; 9. First annular sealing groove; 10. Second mounting base ring; 11. Second annular rubber sealing plate; 12. Second annular sealing groove. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] Please see Figure 1 - Figure 5As shown, a novel shaft seal structure includes a rotary seal 1, which comprises a first mounting base ring 4, a hard base ring 5, rubber bellows 6, a first annular rubber sealing plate 7, and sealing springs 8. The hard base ring 5 is fixedly sleeved on the first mounting base ring 4. There are two rubber bellows 6, which are respectively fixedly installed at both ends of the first mounting base ring 4. There are two first annular rubber sealing plates 7, which are respectively fixedly installed at one end of the two rubber bellows 6. There are two sealing springs 8, both located between the hard base ring 5 and the first annular rubber sealing plate 7. The rotary seal 1 is rotatably installed inside a fixed seal 2, which comprises a second mounting base ring 10 and a second annular rubber sealing plate 11. Two symmetrically fixed components are mounted on the inner wall of the second mounting base ring 10. Annular rubber sealing airbags 3 are installed within the first annular rubber sealing plate 7 and the second annular rubber sealing plate 11, and the annular rubber sealing airbags 3 are movably connected to the first annular rubber sealing plate 7 and the second annular rubber sealing plate 11. During installation, the rotating seal 1 is first fixed to the rotating shaft via the first mounting base ring 4, ensuring a tight fit between the rigid base ring 5 and the shaft. Then, the fixed seal 2 is fixed to the equipment housing via the second mounting base ring 10, aligning the second annular rubber sealing plate 11 with the first annular rubber sealing plate 7 of the rotating seal 1. Finally, the annular rubber sealing airbag 3 is embedded into the first annular sealing groove 9 and the second annular sealing groove 12, completing the assembly. When the shaft rotates, the rotating seal 1 rotates with the shaft, while the fixed seal 2 remains stationary. The elastic deformation capacity of the rubber bellows 6 and the sealing spring 8 can compensate for the radial runout or axial movement of the shaft, ensuring that the sealing interface is always tightly fitted. The annular rubber sealing airbag 3 adaptively deforms under dynamic operating conditions, further reducing friction and leakage risks.

[0021] Specifically, the sealing spring 8 on the rotary seal 1 is sleeved on the outside of the rubber bellows 6, and the sealing spring 8 is fixedly connected to the hard base ring 5 and the first annular rubber sealing plate 7. The outer end of the first annular rubber sealing plate 7 on the rotary seal 1 is provided with a first annular sealing groove 9. The sealing spring 8 presses the first annular rubber sealing plate 7 against the fixed seal 2 through the pre-tightening force to enhance the sealing effect. The flexible design of the rubber bellows 6 allows the sealing plate to be flexibly adjusted when the shaft runs, avoiding wear caused by rigid contact.

[0022] Specifically, the inner end of the second annular rubber sealing plate 11 on the fixed seal 2 is provided with a second annular sealing groove 12, and the second mounting base ring 10 on the fixed seal 2 is sleeved on the outside of the rotary seal 1. The two second annular rubber sealing plates 11 are respectively located on both sides of the rotary seal 1. The second annular sealing groove 12 and the first annular sealing groove 9 cooperate to form an annular space for installing the annular rubber sealing airbag 3. During installation, it is necessary to ensure that the airbag is inflated appropriately to balance the sealing performance and frictional resistance.

[0023] Specifically, the annular rubber sealing airbag 3 is rotatably installed in the first annular sealing groove 9 opened at the outer end of the first annular rubber sealing plate 7 and the second annular sealing groove 12 opened at the inner end of the second annular rubber sealing plate 11. The annular rubber sealing airbag 3 forms a flexible buffer layer between the sealing interfaces, which reduces direct friction and can adaptively expand or contract when the pressure changes, maintaining a stable sealing pressure. It is especially suitable for high pressure or high temperature working conditions.

[0024] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A novel shaft seal structure, characterized in that: The device includes a rotary seal (1), which is composed of a first mounting base ring (4), a hard base ring (5), rubber bellows (6), a first annular rubber sealing plate (7), and sealing springs (8). The hard base ring (5) is fixedly sleeved on the first mounting base ring (4). There are two rubber bellows (6), which are respectively fixedly installed at both ends of the first mounting base ring (4). There are two first annular rubber sealing plates (7), which are respectively fixedly installed at one end of the two rubber bellows (6). There are two sealing springs (8), both located between the hard base ring (5) and the first annular rubber sealing plate (7). Between the sealing plates (7), the rotary seal (1) is rotatably installed inside the fixed seal (2). The fixed seal (2) is composed of a second mounting base ring (10) and a second annular rubber sealing plate (11). There are two second annular rubber sealing plates (11) that are symmetrically fixedly installed on the inner wall of the second mounting base ring (10). Annular rubber sealing airbags (3) are installed inside the first annular rubber sealing plate (7) and the second annular rubber sealing plate (11), and the annular rubber sealing airbags (3) are movably connected to the first annular rubber sealing plate (7) and the second annular rubber sealing plate (11).

2. The novel shaft seal structure according to claim 1, characterized in that: The sealing spring (8) on the rotary seal (1) is sleeved on the outside of the rubber bellows (6), and the sealing spring (8) is fixedly connected to the hard base ring (5) and the first annular rubber sealing plate (7).

3. The novel shaft seal structure according to claim 2, characterized in that: The outer end of the first annular rubber sealing plate (7) on the rotary seal (1) is provided with a first annular sealing groove (9).

4. The novel shaft seal structure according to claim 3, characterized in that: The inner end of the second annular rubber sealing plate (11) on the fixed sealing member (2) is provided with a second annular sealing groove (12).

5. A novel shaft seal structure according to claim 4, characterized in that: The second mounting base ring (10) on the fixed seal (2) is sleeved on the outside of the rotary seal (1), and the two second annular rubber sealing plates (11) are located on both sides of the rotary seal (1).

6. A novel shaft seal structure according to claim 5, characterized in that: The annular rubber sealing airbag (3) is rotatably installed in the first annular sealing groove (9) opened at the outer end of the first annular rubber sealing plate (7) and the second annular sealing groove (12) opened at the inner end of the second annular rubber sealing plate (11).

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