Self-sealing gas charging connector with filter for GIS (Gas Insulated Switchgear)

Abstract

The utility model relates to the technical field of self-sealing joints of gas insulated metal closed switches, in particular to a self-sealing gas charging joint with a filter for a GIS (Gas Insulated Switchgear). The self-sealing inflation connector with the filter for the GIS comprises a connector body, an inflation hole is formed in the connector body, a one-way valve element is arranged between an air inlet and an air outlet of the inflation hole, a connecting disc used for being connected with a GIS tank body is arranged at the air outlet of the connector body, a counter bore is formed in the center of the connecting disc, and a filtering assembly is arranged in the counter bore. The filtering assembly comprises a cover body, a gasket and a filtering piece arranged between the cover body and the gasket, the end, away from the inlet of the inflation hole, of the cover body covers the filtering piece, and the gasket is arranged on a step below the counter bore; and the cover body and the gasket are matched to insulate and isolate the filter from the joint body. The filter assembly is additionally arranged on the original self-sealing joint to filter foreign matters, so that the insulation performance and the operation safety of the GIS equipment are protected, and the equipment damage and accident risk caused by electrical faults are also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of self-sealing joints of gas-insulated metal-enclosed switches, in particular to a self-sealing inflatable joint with a filter for GIS. Background Art

[0002] Gas-insulated metal-enclosed switchgear (GIS) is widely used in power systems due to its strong environmental adaptability, minimal maintenance, compact structure, small footprint, and high reliability. GIS includes busbars, circuit breakers, disconnectors, earthing switches, voltage transformers, current transformers, lightning arresters, cable terminals, and incoming and outgoing bushings. These components are organically combined through optimized design and sealed within a metal casing filled with SF6 gas.

[0003] The gas-insulated metal-enclosed switch is connected to the external inflation equipment through a self-sealing joint. There is a risk of foreign matter entering the switch during the inflation process. When there is foreign matter inside the gas-insulated metal-enclosed switch, these foreign matter will interfere with the distribution of the electric field, causing electric field distortion. The electric field distortion may increase the local electric field strength, thereby increasing the risk of insulation breakdown; foreign matter inside the gas-insulated metal-enclosed switch may cause discharge, which may produce high temperature, arc and other phenomena, causing damage to the equipment.

[0004] The self-sealing joints in the prior art are all self-sealing joints without filtering. Therefore, it is necessary to set a filtering device at the joint between the self-sealing joint and the gas-insulated metal-enclosed switch to filter out foreign matter to protect the interior of the gas-insulated metal-enclosed switch from being affected. Utility Model Content

[0005] The purpose of the utility model is to provide a self-sealing inflatable joint with a filter for GIS, so as to solve the problem of circuit failure caused by foreign matter entering the interior of a gas-insulated metal-enclosed switch.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions for a self-sealing inflatable joint with a filter for GIS:

[0007] A self-sealing inflatable joint with a filter for GIS, comprising a joint body, an inflation hole provided on the joint body, a one-way valve core provided between the air inlet and the air outlet of the inflation hole, a connection disk for connecting to a GIS tank body provided at the air outlet of the joint body, a countersunk hole provided at the center of the connection disk, a filter assembly provided in the countersunk hole, the filter assembly comprising a cover body, a gasket, and a filter plate provided between the cover body and the gasket, the cover body being provided outside the filter plate at an end away from the inflation hole inlet, the gasket being provided on a step below the countersunk hole; the cover body and the gasket cooperate to insulate the filter plate from the joint body.

[0008] Furthermore, the cover body includes a sheath and a pressure ring provided at one end of the sheath, and the filter is provided in the sheath.

[0009] Furthermore, the sheath is positioned and matched with the countersunk hole through an outer peripheral surface.

[0010] Further, the gasket is located within the corresponding end of the sheath.

[0011] Furthermore, the filter is a multi-layer metal sintered mesh filter.

[0012] Furthermore, the cover is a polytetrafluoroethylene cover.

[0013] Furthermore, the gasket is a polytetrafluoroethylene gasket.

[0014] Furthermore, a sealing ring for sealing with the GIS tank body is provided on the connection plate, and the countersunk hole is located inside the sealing ring.

[0015] Furthermore, an enlarged portion with an enlarged diameter is provided in the inflation hole, and the one-way valve core is located in the enlarged portion.

[0016] Furthermore, a valve closing spring is installed on the back of the valve core to drive the valve core to block the inflation hole.

[0017] Beneficial effects: The self-sealing inflatable joint with a filter for GIS of the present invention is an improved invention. Through this solution, a filter assembly is added to the original self-sealing joint to filter out foreign matter, preventing foreign matter from entering the switch and damaging the equipment; the joint body is the core bearing component of the entire self-sealing inflatable joint with a filter for GIS. The design of the inflation hole enables the GIS tank to be easily filled with gas, and the one-way valve core greatly improves the safety and efficiency of inflation; the design of the connecting plate enables the self-sealing inflatable joint with a filter for GIS to be easily and firmly connected to the GIS tank, and the presence of the countersunk hole provides installation space for the filter assembly; the cover of the filter assembly not only protects the filter sheet, but also ensures The filter disc can work stably in the countersunk hole. The setting of the gasket enhances the sealing between the filter assembly and the connector body. The filter disc is the core of the filter assembly. Its fine pore structure can efficiently intercept and remove impurities and particles in the filled gas, ensuring the purity and insulation performance of the gas inside the GIS equipment. The combination of the cover and the gasket not only realizes the insulation isolation between the filter disc and the connector body, but also effectively prevents the transfer of current or charge between the connector body and the filter disc, thereby protecting the insulation performance and operational safety of the GIS equipment, and reducing the risk of equipment damage and accidents caused by electrical failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of an embodiment of a self-sealing joint device with a filter according to the present invention;

[0019] Figure 2 for Figure 1 A schematic structural diagram of the middle cover body 2;

[0020] Figure 3 for Figure 1 Schematic diagram of the structure of the middle washer 4.

[0021] In the figure: 1. GIS tank body; 2. cover body; 3. filter disc; 4. gasket; 5. connector body; 6. one-way valve core; 7. connection plate. DETAILED DESCRIPTION

[0022] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0023] The utility model discloses a self-sealing joint device with a filter, in which a filter is added to the original self-sealing joint to filter foreign matter, thereby preventing the foreign matter from entering the gas-insulated metal-enclosed switch and damaging the equipment.

[0024] As a basic solution, the self-sealing inflatable joint with filter for GIS of the present invention comprises a joint body 5, such as Figure 1As shown, the connector body 5 forms the main structure of the self-sealing inflatable connector with a filter for GIS. It is equipped with an inflatable hole, which allows SF6 gas to enter the GIS tank 1. A one-way valve core 6 is installed between the inlet and outlet of the inflatable hole. This one-way valve core 6 ensures that SF6 gas can flow in only one direction, preventing gas backflow caused by misoperation or system pressure fluctuations, thereby protecting the internal environment of the GIS equipment and extending its service life. A connecting plate 7 for connecting to the GIS tank 1 is located at the outlet of the connector body 5. The connecting plate 7 securely secures the connector body 5 to the GIS tank 1 via bolts or other connection methods. A countersunk hole is provided at the center of the connecting plate 7, which provides space for the installation of the filter assembly. The filter assembly is provided in the countersunk hole. The filter assembly is a key component in the self-sealing inflatable joint with a filter for GIS. The filter assembly filters the gas filled into the GIS tank body 1 and removes impurities and particles therein. The cover body 2 is provided outside the filter plate 3 to protect the filter plate 3 from external interference and ensure the filtering effect. The gasket 4 is provided on the step below the countersunk hole and cooperates with the cover body 2 to insulate the filter plate 3 from the joint body 5.

[0025] As a preferred embodiment, the cover 2 is the key protection structure of the filter assembly, such as Figure 2 As shown, the housing 2 includes a sheath and a pressure ring located at one end of the sheath. The filter 3 is located within the sheath. The sheath is a hollow cylindrical component whose primary function is to house and protect the filter 3, preventing it from physical damage or displacement during inflation. The pressure ring, located at one end of the sheath, compresses the filter 3, ensuring its stability during operation and preventing it from loosening or deforming due to airflow impact.

[0026] As a preferred embodiment, the sheath is positioned and matched with the countersunk hole through the outer peripheral surface. This design ensures that the filter assembly can be accurately and stably installed in the connector body 5, thereby ensuring the smooth progress of the inflation operation and the effectiveness of the filtering effect; the design of the countersunk hole is conducive to the installation and disassembly of the filter assembly, and is convenient for replacing or cleaning the filter plate 3.

[0027] As a preferred embodiment, the gasket 4 is located inside the corresponding end of the sheath, and the structure of the gasket 4 is as follows: Figure 3 As shown, by tightly fitting the gap between the sheath and connector body 5, the filter assembly is sealed and insulated. Simultaneously, the gasket 4 supports the filter disc 3, ensuring it remains stable within the sheath. The sheath provides installation space and support for the gasket 4, allowing it to fully perform its sealing, insulating, and supporting functions.

[0028] In a preferred embodiment, the filter 3 is a multi-layer sintered metal mesh filter. This filter 3, formed from multiple layers of metal mesh sintered at high temperatures, features high precision, high strength, and excellent air permeability. It effectively removes impurities, particulate matter, and micro-contaminants from the gas, ensuring gas purity and quality during inflation operations. Furthermore, the multi-layer sintered metal mesh filter 3 exhibits excellent corrosion and high-temperature resistance, maintaining stable and reliable filtering performance even in harsh operating environments.

[0029] As a preferred embodiment, the cover 2 is a polytetrafluoroethylene (PTFE) cover 2. The polytetrafluoroethylene (PTFE) cover 2 has excellent corrosion resistance, high temperature resistance, a low friction coefficient, and excellent electrical insulation properties. As the cover 2, it can prevent external dust, moisture, chemicals, etc. from invading the filter assembly or the interior of the device, thereby protecting internal parts from damage. The cover 2 also acts as an isolation device, preventing harmful substances or gases generated within the device from leaking into the external environment, ensuring the safety of operators and a clean environment. The PTFE cover 2 has high mechanical strength, which can enhance the overall structural strength of the device to a certain extent and improve its durability. Due to the characteristics of the PTFE material, the cover 2 can operate stably under harsh conditions such as high temperature and high pressure, maintaining its shape and performance.

[0030] In a preferred embodiment, the gasket 4 is a polytetrafluoroethylene (PTFE) gasket, commonly used as a sealing element in filter assemblies, pipe connections, valves, and other sealing applications. The PTFE gasket fits tightly between two contact surfaces, preventing leakage of gas, liquid, or solid particles, thereby ensuring the sealing and integrity of the system. PTFE has a very low coefficient of friction, and as a gasket 4, it can reduce friction and wear between contact surfaces, thereby extending the service life of the equipment.

[0031] As a preferred embodiment, the connection disk 7 is provided with a sealing ring for sealing with the GIS tank body 1. The countersunk hole is located within the sealing ring. The connection disk 7 provides a stable connection interface, connecting the GIS tank body 1 with other equipment or components through fasteners; the sealing ring fills the tiny gap at the connection, forming an effective sealing barrier.

[0032] In a preferred embodiment, the inflation hole is provided with an enlarged portion with an enlarged diameter, and the one-way valve core 6 is located within the enlarged portion. The inflation hole provides a passage for gas to enter the device or container; the enlarged portion provides ample space for components such as the one-way valve core 6, ensuring their proper function; the one-way valve core 6 controls the one-way flow of gas, preventing backflow and leakage.

[0033] In a preferred embodiment, a valve-closing spring is mounted on the back of the valve core, forcing it to block the inflation hole. The valve core controls the opening and closing of the inflation hole; the valve-closing spring provides the force needed to return the valve core to its closed position; and the inflation hole serves as a passage for gas to enter the device or container. The close coordination of these three elements enables the inflation valve to respond quickly and accurately when needed.

[0034] The implementation process of this embodiment is as follows: First, the connector body 5 is the main component of the connector. It is equipped with an air filling hole, which is the main channel for gas to enter the GIS tank body 1. A one-way valve core 6 is installed between the air inlet and outlet of the air filling hole to ensure that gas can only flow in one direction, effectively preventing gas backflow. At the outlet of the connector body 5, a connecting plate 7 is installed, which is used to firmly connect with the GIS tank body 1. A countersunk hole is specially designed at the center of the connecting plate 7. This countersunk hole not only provides installation space for the filter assembly but also ensures stable operation of the filter assembly within the connector body 5. The filter assembly mainly includes a cover body 2, a gasket 4, and a filter 3. The cover body 2 consists of a sheath and a pressure ring. The outer peripheral surface of the sheath is positioned in the countersunk hole to ensure the stable installation of the filter assembly. The filter 3 is mounted in the sheath, and the gasket 4 is located within the corresponding end of the sheath. Together with the cover body 2, it insulates the filter 3 from the connector body 5. This design not only improves filtration efficiency but also effectively prevents the transfer of current or charge between the connector body 5 and the filter disc 3. The filter disc 3 is made of a multi-layered metal sintered mesh, a material with excellent filtration performance and durability. The housing 2 is made of polytetrafluoroethylene, which offers excellent insulation and corrosion resistance. The gasket 4 is also made of polytetrafluoroethylene, ensuring a good seal and insulation. A sealing ring is also provided on the connection plate 7 to seal with the GIS tank body 1, further enhancing the sealing performance of the connector. Furthermore, a diameter-enlarged section is designed within the inflation port, housing the one-way valve core 6. This design enhances the stability of the valve core during operation and facilitates maintenance and replacement. A valve-closing spring is mounted on the back of the valve core, providing the necessary thrust when the valve core is closed, ensuring a tight fit against the wall of the inflation port, effectively preventing gas leakage.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A self-sealing inflatable joint with a filter for GIS, comprising a joint body, an inflating hole provided on the joint body, a one-way valve core provided between the air inlet and the air outlet of the inflating hole, and a connection plate for connecting to a GIS tank body provided at the air outlet of the joint body, characterized in that: A countersunk hole is provided at the center of the connecting disk, and a filter assembly is provided in the countersunk hole. The filter assembly includes a cover body, a gasket, and a filter plate provided between the cover body and the gasket. The cover body is provided outside the filter plate at the end away from the inlet of the inflation hole, and the gasket is provided on the step below the countersunk hole; the cover body and the gasket cooperate to insulate the filter plate from the connector body.

2. The self-sealing inflatable joint with a filter for GIS according to claim 1, characterized in that: The cover body comprises a protective sleeve and a pressure ring arranged at one end of the protective sleeve, and the filter is arranged in the protective sleeve.

3. The self-sealing inflatable joint with a filter for GIS according to claim 2, characterized in that: The sheath is positioned and matched with the counterbore through the outer peripheral surface.

4. The self-sealing inflatable joint with a filter for GIS according to claim 2 or 3, characterized in that: The washers are located within respective ends of the sheaths.

5. The self-sealing inflatable joint with a filter for GIS according to any one of claims 1 to 3, characterized in that: The filter is a multi-layer metal sintered mesh filter.

6. The self-sealing inflatable joint with a filter for GIS according to any one of claims 1 to 3, characterized in that: The cover body is a polytetrafluoroethylene cover body.

7. The self-sealing inflatable joint with a filter for GIS according to any one of claims 1 to 3, characterized in that: The gasket is a polytetrafluoroethylene gasket.

8. The self-sealing inflatable joint with a filter for GIS according to any one of claims 1 to 3, characterized in that: The connection plate is provided with a sealing ring for sealing with the GIS tank body, and the countersunk hole is located inside the sealing ring.

9. The self-sealing inflatable joint with a filter for GIS according to any one of claims 1 to 3, characterized in that: An enlarged portion with an enlarged diameter is provided in the inflation hole, and the one-way valve core is located in the enlarged portion.

10. The self-sealing inflatable joint with a filter for GIS according to claim 9, characterized in that: A valve closing spring for driving the valve core to block the inflation hole is installed on the back of the valve core.

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