CN203445564U - GIS tube bus housing flange sealing structure - Google Patents

Abstract

The utility model discloses a GIS pipe busbar shell flange sealing structure, which is characterized in that it includes left and right butt joint flanges, and the left and right butt joint flanges pass through the tenon and groove surface structure, V-shaped rubber ring and ring sealant sequentially from the inside to the outside. Cavities, bolts, and left and right flanges are sealed with waterproof glue. The flange sealing structure of the GIS pipe busbar shell uses multiple seals to achieve reliable sealing of SF6 gas and ensure the safe and stable operation of the power grid.

Description

A GIS pipe busbar housing flange sealing structure

technical field

The utility model relates to a flange sealing structure of a GIS pipe busbar casing, in particular to a sealing structure of SF6 gas-insulated metal-enclosed switchgear in a power system.

Background technique

With the rapid development of my country's electric power industry, the application of GIS (gas-insulated metal-enclosed switchgear) is more extensive and common. Compared with conventional power distribution devices, GIS has the advantages of small footprint, all components are sealed from environmental interference, high reliability, convenient operation, long maintenance cycle, small maintenance workload, rapid installation, low operating costs, and no electromagnetic interference Etc. Since the development of GIS, it has developed very rapidly, and GIS technology has become the mainstream of contemporary high-voltage electrical appliances.

GIS uses sulfur hexafluoride (SF6) gas with excellent insulation and arc extinguishing properties as the insulation and arc extinguishing medium, and seals all high-voltage electrical components in grounded metal cylinders. SF6 is a greenhouse gas and is toxic. If it is discharged into the atmosphere, it will not only cause irreparable pollution and damage to the environment on which we live, but also endanger the normal operation of electrical equipment and personal health. However, during the operation of GIS high-voltage switchgear, SF6 gas leakage incidents occur frequently, which will directly threaten the safe operation of the equipment and cause great harm to the safety of electrical equipment, personnel and the environment. Sometimes it is necessary to carry out power-off maintenance, which causes huge losses to industrial and agricultural production. In addition, it will also bring certain harm to people and the environment. In recent years, power outage accidents caused by the leakage of SF6 gas in pipe busbars have occurred frequently, which has become one of the core problems that need to be solved urgently in power supply safety.

Domestic high-voltage switch manufacturers, when installing the GIS pipe busbar housing, simply apply sealant in the sealing groove on the flange butt joint surface, then put it into the sealing ring for installation, and then perform leak detection. There are also improvements to the structure but the sealing effect is limited. More research focuses on the development of sealing adhesives and sealing rings, and achieves certain characteristics by changing the material composition or material.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art, and propose a GIS pipe busbar shell flange sealing structure, which forms five seals for a GIS pipe busbar shell flange sealing structure, and the left butt joint flange The inner side of the butt joint with the right butt flange is the tongue and groove surface seal, the V-shaped rubber ring seal, the sealant chamber seal, the bolt seal and the outermost seal with waterproof glue. The flange sealing structure of the GIS pipe busbar housing uses multiple seals to achieve reliable sealing of SF6 gas and ensure the safe and stable operation of the power grid.

In order to achieve the above object, the utility model adopts the following technical solutions:

A flange sealing structure for a GIS pipe busbar shell, including left and right butt joint flanges, and the left and right butt joint flanges pass through the tenon and groove surface structure, V-shaped rubber ring, annular sealant chamber, bolts and the end faces of the left and right flanges from the inside to the outside in sequence for waterproofing Glue to seal.

The tongue-and-groove surface structure is a tenon surface and a groove surface respectively arranged on the left and right butt flanges.

The opening direction of the V-shaped rubber ring is toward the side of the SF6 gas chamber.

The left butt joint flange is provided with two jackscrew holes communicating with the sealant chamber and blocked by jackscrews, one is used as a glue injection hole, and the other is used as a vent hole.

The exhaust hole is arranged parallel to the glue injection hole.

A sealant is injected into the annular sealant cavity.

The beneficial effects of the utility model are:

1. This sealing structure is equipped with multiple seals, which can effectively prevent the leakage of SF6 gas. The combined use of the tenon groove surface and the V-shaped rubber ring seal can give full play to the advantages of both. The V-shaped rubber ring has a self-sealing effect and is not easy to corrode, blocking the connection between the inside and outside of the GIS pipe busbar shell to achieve a better sealing effect .

2. Due to the existence of the tongue-and-groove surface and fastening bolt holes at the flange joints of this sealing structure, the flanges of this sealing structure are easier to assemble accurately during installation. The outer layer is coated with waterproof glue, and the glue injection hole is injected with sealant, so that the GIS high-voltage switchgear has a good waterproof effect during operation, and will not cause SF6 gas leakage due to water entering the GIS busbar flange sealing surface, ensuring the safety of the equipment. Security and stability of grid transmission capacity.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a left view of the utility model.

Fig. 3 is the structural representation of V-shaped apron in the utility model

In the figure: 1. Left docking flange, 2. Right docking flange, 3. Waterproof glue, 4. Bolt hole, 5. Vent hole, 6. Sealant, 7. V-shaped rubber ring, 8. Tenon surface, 9. Groove surface, 10. Glue injection hole, 11. SF6 gas chamber.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

The principle of the utility model is shown in Figure 1, a GIS pipe busbar shell flange sealing structure, the left butt flange 1 and the right butt flange 2, in the middle of the left butt flange 1 and the right butt flange 2 are provided The SF6 gas chamber 11 has a tenon surface 8 on the butt surface of the left butt flange 1, and a groove surface 9 on the butt surface of the right abut flange 2, and the tenon surface 8 and the groove surface 9 are butted together to form the first seal. A self-sealing V-shaped rubber ring 7 is provided between the left butt flange 1 and the right butt flange 2, and the V-shaped rubber ring 7 serves as a second seal. On the outside of the V-shaped rubber ring 7, an annular sealant cavity is provided on the butt surfaces of the left butt flange 1 and the right butt flange 2, and the sealant cavity is injected with a sealant 6 to form a third seal. On the left butt joint flange 1, there are two top screw holes connected with the sealant chamber and blocked by the top wire, one is used as the glue injection hole 10, and the other is used as the exhaust hole 5; as shown in Figure 2, the left butt joint The screw hole at the bottom of the flange 1 is used as the glue injection hole 10, and the top screw hole at the top of the left butt flange 1 is used as the vent hole 5, and the vent hole 5 and the glue injection hole 10 are set at 180°. Bolt holes 4 are drilled on the left butt flange 1 and the right butt flange 2 for tightening the bolts to form the fourth seal. Apply waterproof glue 3 on the outermost side of the butt surface formed by the left butt flange 1 and the right butt flange 2 to form a fifth seal.

When injecting the sealant 6, remove the top wire on the glue injection hole 10 and the vent hole 5, insert the glue injection tool into the glue injection hole 10, adjust the pressure and start the glue injection, wait until the vent hole 5 flows out of the sealant When the glue is 6 and there is no air or air bubbles overflow, stop the operation, and the glue injection should be completed at one time.

FIG. 3 is a schematic structural diagram of the V-shaped apron 7 . The opening direction of the V-shaped rubber ring 7 faces the side of the SF6 gas chamber 11. Before the sealing structure is installed, the opening of the V-shaped rubber ring 7 has a certain pre-opening value, as shown by the dotted line in the figure, and the formed sealing structure can effectively prevent Leakage of SF6 gas.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (2)

1. A flange sealing structure for GIS pipe busbar housing, characterized in that it includes left and right butt flanges, and the left and right butt flanges pass through the tongue and groove surface structure, V-shaped rubber ring, annular sealing rubber cavity, and bolts from inside to outside in sequence. It is sealed with waterproof glue on the end faces of the left and right flanges. The tenon and groove structures are the tenon and groove surfaces respectively set on the left and right butt flanges. The opening direction of the V-shaped rubber ring faces the SF6 gas chamber side. Two top wire holes communicated with the sealant cavity and blocked by the top wire: one is used as a glue injection hole, and the other is used as a vent hole; the annular sealant cavity is filled with sealant. the 2 . The flange sealing structure of the GIS pipe busbar housing according to claim 1 , wherein the exhaust hole is arranged parallel to the glue injection hole. 3 . the

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