A double-bearing support-based inflatable ring main unit sealing structure

Abstract

This utility model discloses a sealing structure for an inflatable ring main unit based on dual bearing support, including a sealing flange. A sealing shaft is disposed inside the sealing flange, penetrating the flange. The sealing shaft includes a shaft head one, a shaft body, and a shaft head two, which are respectively fixedly installed on both sides of the shaft body. The sealing flange includes a cylindrical body and a disc body. The shaft body is disposed inside the cylindrical body. Bearings one and two are respectively disposed at both ends of the outer side of the shaft body. An elastic sealing ring one is disposed along one side of bearing one, and an elastic sealing ring two is disposed along one side of bearing two. Both elastic sealing rings one and two are made of fluororubber. This achieves an elastic sealing effect, increases the sealing performance of the sealing structure, and thus solves the problem of air leakage caused by wear, deformation, and other factors that easily lead to a decrease in sealing performance under long-term operation and complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of sealing structure technology, specifically to an inflatable ring main unit sealing structure based on dual bearing support. Background Technology

[0002] Gas-insulated ring main units (RMUs) are indoor AC high-voltage gas-insulated metal-enclosed switchgear. They employ a sealed design to isolate and protect the internally pressurized gas. Traditional RMU dynamic sealing structures are often relatively simple, with the sealing shaft supported only by a bearing on one side of the oil seal within the sealing flange. With technological advancements, RMUs have begun to adopt more advanced dynamic sealing structures. A significant innovation is the double-sided support technology for the sealing shaft. In this structure, the sealing shaft is supported not only on one side of the oil seal but also on the other side, achieving stable double-sided support. For example, the authorized patent CN209844233U (A Dynamic Sealing Structure for Double-End Fixing of Gas-Insulated Ring Main Units) includes a sealing flange and a sealing shaft, with the sealing shaft... The shaft is divided into three parts: a first shaft head, a shaft body, and a second shaft head, separated by a first shoulder and a second shoulder. A first bearing, a first skeleton oil seal, a second skeleton oil seal, and a second bearing are sequentially fitted onto the shaft body, and the shaft body and all fitted components are installed within the inner hole of the sealing flange. The second shaft head extends out of the sealing flange through the flange cover plate, which is fixedly connected to the sealing flange. While the existing technology ensures the coaxiality of the sealing shaft, skeleton oil seal, and sealing flange, under long-term operation and complex working conditions, wear and deformation can easily lead to a decrease in sealing performance. Furthermore, traditional sealing structures lack sufficient elasticity and adaptability to cope with axial and radial displacements, resulting in air leakage. Therefore, the market urgently needs to develop an inflatable ring main unit sealing structure based on dual bearing support to help solve the existing problems. Utility Model Content

[0003] The purpose of this invention is to provide a sealing structure for an inflatable ring main unit based on dual bearing support, in order to solve the problem mentioned in the background art that the sealing performance is easily reduced and air leakage occurs due to wear, deformation and other factors during long-term operation and under complex working conditions.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a sealing structure for an inflatable ring main unit based on double bearing support, comprising a sealing flange, a sealing shaft disposed inside the sealing flange, the sealing shaft penetrating the sealing flange, the sealing shaft comprising a shaft head one, a shaft body, and a shaft head two, the shaft head one and shaft head two being fixedly installed on both sides of the shaft body respectively, and the shaft head one, shaft body, and shaft head two being an integral structure, the sealing flange comprising a cylinder and a disc, the shaft body being disposed inside the cylinder, bearing one and bearing two being disposed at both ends of the outer side of the shaft body respectively, an elastic sealing ring one being disposed along one side of bearing one on the outer side of the shaft body, and an elastic sealing ring two being disposed along one side of bearing two on the outer side of the shaft body, both the elastic sealing ring one and the elastic sealing ring two being made of fluororubber material.

[0005] Preferably, the first elastic sealing ring and the second elastic sealing ring have the same shape and structure, and the outer surface of the second elastic sealing ring is provided with an outer groove, which is configured as a spiral groove.

[0006] Preferably, the second elastic sealing ring has a metal ring inside, and there are multiple metal rings arranged at intervals.

[0007] Preferably, a skeleton oil seal is provided on the side of the bearing one away from the elastic sealing ring one, and the skeleton oil seal is fitted on the outside of the shaft body; a skeleton oil seal is provided on the side of the bearing two away from the elastic sealing ring two, and the skeleton oil seal two is fitted on the outside of the shaft body.

[0008] Preferably, a gasket is provided between the bearing, the elastic sealing ring, and the skeleton oil seal.

[0009] Preferably, a gasket is provided between the bearing two, the skeleton oil seal two, and the elastic sealing ring two.

[0010] Preferably, a flange cover plate is fixedly installed on one side of the cylindrical body of the sealing flange, and the shaft head of the sealing shaft extends out from inside the sealing flange through the flange cover plate.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) By introducing a double bearing support design, this utility model not only improves the rotational accuracy and stability of the sealing shaft, but also helps to disperse and balance the axial and radial forces. Furthermore, by using an elastic sealing ring made of fluororubber, when the sealing shaft undergoes a small displacement, the elastic properties of the fluororubber enable the sealing ring to better adapt to the small displacement caused by factors such as temperature changes and vibrations. It can adaptively adjust its shape, maintain tight contact with the sealing surface, effectively prevent air leakage, improve the sealing reliability and safety of the ring main unit, and extend the service life of the equipment.

[0013] (2) By setting a spiral groove on the outer surface of the second elastic sealing ring, the present invention can increase the contact area between the first elastic sealing ring and the second elastic sealing ring and the sealing flange, thereby improving the sealing performance;

[0014] (3) By setting multiple metal rings inside the elastic sealing ring, the strength and rigidity of the sealing ring are enhanced, so that the sealing structure can remain stable when subjected to large pressure or impact, and is not prone to deformation or breakage, which helps to improve the overall stability and reliability of the sealing structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an inflatable ring main unit sealing structure based on dual bearing support according to this utility model.

[0016] Figure 2 This is a cross-sectional view of an inflatable ring main unit sealing structure based on dual bearing support according to this utility model.

[0017] Figure 3 This is a schematic diagram of the sealing shaft of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the second elastic sealing ring of this utility model;

[0019] Figure 5 This is an enlarged schematic diagram of part A of this utility model.

[0020] In the diagram: 1. Sealing flange; 101. Cylinder body; 102. Disc body; 2. Flange cover plate; 3. Sealing shaft; 301. Shaft head one; 302. Shaft body; 303. Shaft head two; 4. Bearing one; 5. Gasket one; 6. Elastic sealing ring one; 7. Skeleton oil seal one; 8. Bearing two; 9. Gasket two; 10. Skeleton oil seal two; 11. Elastic sealing ring two; 1101. External groove; 12. Metal ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Please see Figures 1-5This utility model provides an embodiment of an inflatable ring main unit sealing structure based on double bearing support, including a sealing flange 1. A sealing shaft 3 is provided inside the sealing flange 1, and the sealing shaft 3 passes through the sealing flange 1. The sealing shaft 3 includes a shaft head 301, a shaft body 302, and a shaft head 303. The shaft head 301 and the shaft head 303 are respectively fixedly installed on both sides of the shaft body 302, and the shaft head 301, shaft body 302, and shaft head 303 are integrated into one structure. The sealing flange 1 includes a cylinder 101 and a disc 102. The shaft body 302 is located inside the cylinder 101. Bearing 4 and bearing 8 are respectively provided at both ends of the outer side of the shaft body 302. An elastic sealing ring 6 is provided along one side of the bearing 4 on the outer side of the shaft body 302, and an elastic sealing ring 11 is provided along one side of the bearing 8 on the outer side of the shaft body 302. Both the elastic sealing ring 6 and the elastic sealing ring 11 are made of fluororubber material.

[0023] By introducing a dual-bearing support design, with bearing 4 and bearing 8 respectively installed at both ends of the outer side of the shaft 302, not only is the rotational accuracy and stability of the sealing shaft 3 improved, but it also helps to distribute and balance axial and radial forces, thereby further reducing the risk of seal failure caused by uneven stress. Furthermore, by employing elastic sealing rings 6 and 11 made of fluororubber, which possess excellent oil resistance, solvent resistance, high temperature resistance, and superior elastic recovery, the elastic sealing rings can maintain good sealing performance under long-term operation and complex working conditions. Even with slight displacement of the sealing shaft 3, the sealing rings can still provide a reliable seal. At the same time, the elastic properties of fluororubber enable the two sealing rings to better adapt to the minute displacements of the shaft 302 caused by factors such as temperature changes and vibrations. They can adaptively adjust their shape to maintain tight contact with the sealing surface. Thus, the design of the adaptive elastic sealing ring 6 and the elastic sealing ring 11 makes the sealing structure more elastic and adaptable to axial and radial displacements, effectively preventing air leakage. This solves the problem of decreased sealing performance and air leakage that easily occurs in the existing inflatable ring main unit sealing structure under long-term operation and complex working conditions, improves the sealing reliability and safety of the ring main unit, and extends the service life of the equipment.

[0024] Please see Figure 2 and Figure 4 The elastic sealing ring 6 and the elastic sealing ring 11 have the same shape and structure. The outer surface of the elastic sealing ring 11 has an outer groove 1101, which is a spiral groove.

[0025] The spiral groove design increases the contact area between the elastic sealing ring 6 and the elastic sealing ring 11 and the sealing flange 1, thereby improving the sealing performance.

[0026] Please see Figure 5The elastic sealing ring 11 has a metal ring 12 inside, and there are multiple metal rings 12 arranged at intervals.

[0027] The addition of metal ring 12 enhances the strength and rigidity of the sealing ring, enabling the sealing structure to remain stable under greater pressure or impact, and preventing deformation or breakage, thus improving the overall stability and reliability of the sealing structure.

[0028] Please see Figure 2 A skeleton oil seal 7 is provided on the side of bearing 4 away from the elastic sealing ring 6, and the skeleton oil seal 7 is sleeved on the outside of the shaft body 302. A skeleton oil seal 10 is provided on the side of bearing 8 away from the elastic sealing ring 11, and the skeleton oil seal 10 is sleeved on the outside of the shaft body 302.

[0029] The installation of skeleton oil seal 7 and skeleton oil seal 10 can effectively prevent oil leakage from the bearing and help improve the sealing performance of the sealing structure.

[0030] Please see Figure 2 Gasket 5 is provided between bearing 4 and elastic sealing ring 6 and skeleton oil seal 7, and gasket 9 is provided between bearing 8 and skeleton oil seal 10 and elastic sealing ring 11.

[0031] The installation of gaskets can increase the sealing area and improve the sealing effect. At the same time, gasket 5 and gasket 9 can also reduce the wear of bearing 4 and bearing 8 on the structures on both sides, thus increasing practicality.

[0032] Please see Figure 1 and Figure 2 A flange cover plate 2 is fixedly installed on one side of the cylinder 101 of the sealing flange 1, and the shaft head 303 of the sealing shaft 3 extends out from the inside of the sealing flange 1 through the flange cover plate 2.

[0033] The flange cover plate 2 makes the sealing structure more complete and robust, preventing external impurities from entering the sealing structure and ensuring its cleanliness. At the same time, this design also facilitates the maintenance and replacement of the sealing shaft 3, improving the maintainability and reliability of the sealing structure.

[0034] Working principle: In use, the sealing shaft 3 is fixedly installed on both sides of the shaft body 302 through its shaft head 301 and shaft head 303, forming an integral structure that passes through the cylinder 101 of the sealing flange 1. The two ends of the shaft body 302 are supported by bearing 4 and bearing 8 respectively, which improves the rotation accuracy and stability, and at the same time distributes and balances the axial and radial forces, reducing the risk of seal failure. The elastic sealing rings 6 and 11 made of fluororubber are tightly attached to the outside of the shaft body 302. Utilizing the oil resistance, solvent resistance, high temperature resistance and excellent elastic recovery ability of fluororubber, a good sealing effect is maintained. It can also adapt to the small displacement of the shaft body 302 caused by temperature changes, vibration, etc., and maintain tight contact to prevent air leakage. The spiral groove increases the contact area between the sealing ring and the sealing flange 1. The addition of the metal ring 12 enhances the strength and rigidity of the sealing ring, improving the reliability, safety and service life of the sealing structure.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sealing structure for an inflatable ring main unit based on dual bearing support, comprising a sealing flange (1), characterized in that: The sealing flange (1) is internally provided with a sealing shaft (3), which penetrates the sealing flange (1). The sealing shaft (3) includes a shaft head (301), a shaft body (302), and a shaft head (303). The shaft head (301) and shaft head (303) are respectively fixedly installed on both sides of the shaft body (302), and the shaft head (301), shaft body (302), and shaft head (303) are set as an integral structure. The sealing flange (1) includes a cylinder (101) and a disc. Body (102), the shaft (302) is located inside the cylinder (101), the two ends of the outer side of the shaft (302) are respectively provided with bearing one (4) and bearing two (8), the outer side of the shaft (302) is provided with an elastic sealing ring one (6) along one side of bearing one (4), and the outer side of the shaft (302) is provided with an elastic sealing ring two (11) along one side of bearing two (8). Both the elastic sealing ring one (6) and the elastic sealing ring two (11) are made of fluororubber material.

2. The inflatable ring main unit sealing structure based on dual bearing support according to claim 1, characterized in that: The elastic sealing ring one (6) and the elastic sealing ring two (11) have the same shape and structure. The outer surface of the elastic sealing ring two (11) is provided with an outer groove (1101), and the outer groove (1101) is set as a spiral groove.

3. The inflatable ring main unit sealing structure based on dual bearing support according to claim 2, characterized in that: The elastic sealing ring 2 (11) is provided with a metal ring (12) inside, and multiple metal rings (12) are provided, with the multiple metal rings (12) arranged at intervals.

4. The inflatable ring main unit sealing structure based on dual bearing support according to claim 1, characterized in that: A skeleton oil seal 1 (7) is provided on the side of the bearing 1 (4) away from the elastic sealing ring 1 (6), and the skeleton oil seal 1 (7) is sleeved on the outside of the shaft body (302). A skeleton oil seal 2 (10) is provided on the side of the bearing 2 (8) away from the elastic sealing ring 2 (11), and the skeleton oil seal 2 (10) is sleeved on the outside of the shaft body (302).

5. The inflatable ring main unit sealing structure based on dual bearing support according to claim 4, characterized in that: Gaskets (5) are provided between the bearing (4), the elastic sealing ring (6), and the skeleton oil seal (7).

6. The inflatable ring main unit sealing structure based on dual bearing support according to claim 4, characterized in that: Gaskets (9) are provided between the bearing (8) and the skeleton oil seal (10) and the elastic sealing ring (11).

7. The inflatable ring main unit sealing structure based on dual bearing support according to claim 1, characterized in that: A flange cover plate (2) is fixedly installed on one side of the cylinder (101) of the sealing flange (1), and the shaft head (303) of the sealing shaft (3) extends out from the sealing flange (1) through the flange cover plate (2).

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