GIS (gas insulated switchgear) high-voltage combined electrical apparatus with high-sealing connecting assembly

Abstract

The invention relates to the technical field of GIS sealing, in particular to a GIS high-voltage combined electric appliance with a high-sealing-performance connecting assembly, which comprises a metal cylinder, connecting flanges are arranged at the end part of the metal cylinder, a positioning block is arranged between two opposite connecting flanges, a sealing part is arranged on the positioning block, and the sealing part comprises a first sealing element and a second sealing element. Wherein the first sealing piece is symmetrically arranged outside the positioning block, and the second sealing piece is located in the middle of the positioning block; an air guide channel is formed in the positioning block and is used for communicating the two opposite metal barrels; a switching part is arranged in the middle of the positioning block and used for adjusting the communication state of the air guide channel and the sealing part. By arranging the switching part, when the elastic ring is aged and cracked, the first seal is enhanced by guiding gas, when the first seal is damaged, the elastic ring seal is improved, and when the metal barrel is damaged, the isolation gas chamber can avoid pressure loss of multiple devices.

Description

Technical Field

[0001] The present invention relates to the technical field of GIS sealing, and in particular to a GIS high-voltage combined electrical appliance with a high-sealing connection assembly. Background Art

[0002] As a core component of modern power systems, gas-insulated switchgear (GIS) are widely used in high-voltage power transmission and distribution due to their compact design and exceptional reliability. These devices seal key components, such as circuit breakers, disconnectors, and transformers, within a metal cylinder filled with high-pressure sulfur hexafluoride (SF6) gas. This gas-insulated structure enables efficient and stable operation. However, SF6 leakage remains a key factor hindering the long-term stability of GIS, with sealing defects at flange joints being particularly prominent.

[0003] During actual operation, GIS equipment has exposed some inherent defects, with SF6 leakage being a particularly prominent issue. The causes of SF6 leakage vary, ranging from insufficient sealing of the equipment itself to weld cracks, with leakage at flange connections being a typical example.

[0004] The technical solution of Chinese patent application No. 202120368418.3 discloses a flange sealing structure suitable for GIS substations. This structure has high sealing reliability and can ensure good sealing performance between the connecting flanges even in the case of failure of the rubber sealing ring. The structure includes flange one and flange two on the electrical container. The contact end face of flange one is provided with an annular sealing groove and a circle of protrusions arranged around it. The protrusions are located between the annular sealing groove and the bolt holes of flange one; the contact end face of flange two is provided with a circle of grooves adapted to the protrusions, and the grooves are poured with sealant to fill the gap between the protrusions and the grooves. This structure forms a sealing ring by filling the sealant, which can still maintain the sealing effect when the internal sealing ring fails, effectively reducing the probability of SF6 leakage inside the GIS equipment and reducing the possibility of failure.

[0005] Although the above patented technical solution improves the sealing effect by filling the sealant, in actual application, the existing GIS connection components still have some technical problems that need to be solved: First, the reliability of a single rubber ring seal is limited. Existing GIS metal cylinder connections rely primarily on a single rubber ring to achieve an airtight seal against sulfur hexafluoride. This sealing structure offers limited safety protection, poor sealing effectiveness, and lacks real-time monitoring. Currently, pressure drop feedback is limited to density relays, making it impossible to precisely locate leaks.

[0006] Second, the shared gas chamber design presents a risk of cascading leaks. Although GIS electrical components mostly use flanges and basin-type insulators for electrical isolation and airtight separation, creating independent gas chambers between each metal cylinder, to reduce equipment complexity, non-arcing equipment such as voltage transformers and lightning arresters are often combined into the same gas chamber. While this design reduces equipment complexity, a leak in the shared gas chamber can cause simultaneous decompression of multiple devices, leading to a simultaneous decrease in insulation strength and potentially more serious consequences. Summary of the Invention

[0007] The object of the present invention is to provide a GIS high-voltage combined electrical appliance with a highly sealed connection assembly to solve the technical problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: A GIS high-voltage combined electrical appliance with a highly sealed connection assembly includes a gas-insulated substation, wherein the gas-insulated substation includes a plurality of metal cylinders assembled and connected for protecting electrical components, wherein the metal cylinders are filled with sulfur hexafluoride; A connecting flange is provided at the end of the metal cylinder; A positioning block is provided between two opposite connecting flanges and is used for coaxial positioning between the metal cylinders; The sealing portion includes a first sealing member and a second sealing member, wherein the first sealing member is symmetrically arranged outside the positioning block, and the second sealing member is located in the middle of the positioning block; An air guide channel, whose array is distributed inside the positioning block and is used to connect the two opposing metal cylinders; The switching parts are arranged in an array in the middle of the positioning block and are used to adjust the communication state between the air guide channel and the sealing part.

[0009] Preferably, the switching unit includes: The mounting groove is arranged in an array in the middle of the positioning block and is connected to the air guide channel; a connecting channel, which is symmetrically distributed in the middle of the mounting groove and communicates with the first sealing member; The movable block is arranged inside the installation groove and is provided with an elastic member connected with the second sealing member.

[0010] Preferably, the second sealing member comprises: The mounting portion is arranged in the middle of the positioning block and has air passages connected to the mounting grooves distributed in an array thereon; The elastic ring is arranged on the top of the mounting portion and is connected with the air passage.

[0011] Preferably, the height of the movable block is greater than the diameter of the air guide channel, and the height of the movable block is greater than the diameter of the connecting channel.

[0012] Preferably, when the movable block is in the first position, the movable block blocks the connecting channel, and the connecting channel and the air guide channel are in a disconnected state; When the movable block is in the second position, the movable block blocks the air passage, and the connecting passage and the air guide passage are in a communicating state; When the movable block is in the third position, the movable block blocks the air guide channel, and at this time the connecting channel and the air duct are in a communicating state.

[0013] Preferably, a seating groove is provided at the connection point between the air passage and the mounting groove, and one end of the elastic member away from the movable block is located inside the seating groove.

[0014] Preferably, a connecting portion is provided on the outer side of the elastic ring, the connecting portion is connected to an air supply device via a conduit, and the conduit is provided with a pressure detection unit for detecting the air pressure of the elastic ring.

[0015] Preferably, the mounting portion is provided with extrusion grooves distributed in an array, and the extrusion grooves are distributed on both sides of the air duct.

[0016] Preferably, an inner supporting elastic member is provided inside the elastic ring.

[0017] Preferably, the connecting flanges are connected to each other via bolts distributed in a ring array, and the diameter of the elastic ring is smaller than the diameter of the ring formed by the bolts.

[0018] Technical effects and advantages of the present invention: The present invention provides a switching part so that it can change its position according to the needs of different stages. During the equipment assembly stage, the movable block is adjusted to a position that connects the connecting channel with the air guide channel to complete the inflation operation. After the inflation is completed, the movable block moves and blocks the connecting channel, thereby effectively preventing gas leakage; when the pressure detection unit detects that the air pressure of the elastic ring is abnormal, for example, when the air pressure continues to drop due to aging and cracking of the elastic ring, the movable block will move and release the blockage of the connecting channel, allowing high-pressure sulfur hexafluoride to enter and enhance the sealing effect of the first seal; if the air pressure exceeds the set value, it indicates that the first seal may be damaged. At this time, the fit between the elastic ring and the connecting flange can be enhanced through corresponding operations to maintain the sealing performance; moreover, in the event of leakage in the metal cylinder or the connecting flange, the present invention can cooperate with the air supply device to achieve independent isolation of the air chamber, thereby avoiding simultaneous decompression of multiple devices and ensuring the safe operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure distribution of GIS combination electrical appliances; Figure 2 Schematic diagram of the main structure of the connection assembly of the present invention; Figure 3 Schematic diagram of the internal structure of the metal cylinder of the present invention; Figure 4 This is a cross-sectional schematic diagram of the positioning block of the present invention. Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at A in the middle; Figure 6 Schematic diagram of the structure of the sealing portion of the present invention.

[0020] In the picture: 1. Metal cylinder; 2. Connecting flange; 3. Bolts; 4. Positioning block; 5. Sealing portion; 501. First sealing member; 502. Second sealing member; 5021. Mounting portion; 5022. Elastic ring; 5023. Air passage; 5024. Mounting groove; 6. Extrusion trough; 7. Switching portion; 701. Mounting slot; 702. Connecting channel; 703. Movable block; 704. Elastic member; 8. Connecting part; 9. Air guide channel; 100. Gas insulated substation. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example 1

[0022] Reference Figures 1 to 6 As shown, the present invention provides a GIS high-voltage combined electrical appliance with a highly sealed connection assembly, including a gas-insulated substation 100. The gas-insulated substation 100 includes a plurality of metal cylinders 1 assembled and connected for protecting electrical components, and the metal cylinders 1 are filled with sulfur hexafluoride.

[0023] The GIS high-voltage switchgear includes electrical components such as circuit breakers, earthing switches, disconnectors, voltage transformers, and current transformers electrically connected to the busbar. These components together form a gas-insulated fully enclosed switchgear through a metal cylinder 1.

[0024] In order to reduce the complexity of the equipment, for the metal cylinders 1 that are interconnected between non-arc equipment such as voltage transformers and lightning arresters, after the connection operation is completed, the various air chambers in the metal cylinder 1 are interconnected, that is, multiple air chambers are integrated into a unified air chamber, thereby ensuring equal pressure inside each metal cylinder 1.

[0025] The situation where multiple gas chambers are interconnected is applicable to the connection between non-arcing equipment, the connection between long busbar segments, and other scenarios requiring voltage equalization.

[0026] A connecting flange 2 is provided at the end of the metal cylinder 1, and a positioning block 4 is provided between the two connecting flanges 2. The positioning block 4 is located inside the metal cylinder 1 and is used for coaxial positioning between the metal cylinders 1; a second sealing member 503 is provided in the middle of the positioning block 4, and a first sealing member 502 is provided on both sides of the second sealing member 503.

[0027] The first sealing member 502 comprises an elastic sealing ring fixedly connected to the positioning block 4. Both ends of the positioning block 4 are provided with connectors for connecting electrical components.

[0028] The second sealing member 503 includes a mounting portion 5031 arranged in the middle of the positioning block 4 , an elastic ring 5032 is provided on the outside of the mounting portion 5031 , an inner supporting elastic member 704 is provided inside the elastic ring 5032 , and a diameter of the elastic ring 5032 is greater than the thickness of the mounting portion 5031 .

[0029] The inner supporting elastic member 704 includes an elastic reinforcing rib, which is fixedly connected to the elastic ring 5032 .

[0030] The connecting flanges 2 are connected to each other via bolt members 3 distributed in a ring array. The diameter of the elastic ring 5032 is smaller than the diameter of the ring formed by the bolt members 3 .

[0031] When connecting two metal cylinders 1, first fill the positioning block 4 into one of the metal cylinders 1. When the positioning block 4 is filled into the metal cylinder 1, the first sealing member 502 at the first end of the positioning block 4 and the inner wall of the metal cylinder 1 are squeezed against each other, so that the positioning block 4 and the metal cylinder 1 have a fixing effect; then, the other metal cylinder 1 is docked with the second end of the positioning block 4, and the first sealing member 502 at the second end of the positioning block 4 is also squeezed against the inner wall of the metal cylinder 1, so that the positioning block 4 and the two metal cylinders 1 have a fixing effect.

[0032] After the installation of the positioning block 4 is completed, the connection between the connecting flanges 2 on the metal cylinder 1 is achieved by the bolt member 3, so that the connecting flanges 2 on the two metal cylinders 1 are close to each other. During the process of the connecting flanges 2 approaching each other, the opposite end faces of the connecting flanges 2 squeeze the elastic ring 5032 so that the elastic ring 5032 fits tightly with the opposite end faces of the connecting flanges 2.

[0033] After the connection between the connecting flanges 2 is completed, a first sealing layer is formed between the first sealing member 502 and the inner wall of the metal cylinder 1, and a second sealing layer is formed between the elastic ring 5032 and the opposite end surface of the connecting flange 2. Through the combined action of the first sealing layer and the second sealing layer, the sealing between the connecting flanges 2 is improved, and the probability of sulfur hexafluoride leakage inside the metal cylinder 1 is reduced.

[0034] It should be noted that: when installing the positioning block 4 and the metal cylinder 1, some organic silicone is applied to the inner wall of the metal cylinder 1 to improve the lubricity between the first sealing member 502 and the metal cylinder 1, and to avoid excessive wear of the first sealing member 502 when moving inside the metal cylinder 1. At the same time, since organic silicone has a certain adhesion, after the metal cylinders 1 are connected, the organic silicone will bond the first sealing member 502 and the metal cylinder 1 together, thereby improving the sealing effect of the first sealing layer. Example 2

[0035] Although the above embodiment improves the sealing between the connecting flange 2 by means of the first sealing member 502 and the second sealing member 503, during long-term use, the sealing effect of the sealing member is weakened due to aging and cracking of the sealing member, thereby causing gas leakage inside the metal cylinder 1. However, the prior art lacks treatment measures and monitoring means for such situations. In view of the technical improvements made on the basis of the first embodiment, the improved technical solution is as follows: Reference Figures 2 to 6 As shown, the present invention provides a GIS high-voltage combined electrical appliance with a high-sealing connection assembly, including an air guide channel 9 opened inside the positioning block 4. The air guide channel 9 is distributed in an array on the positioning block 4 and is used to connect two opposite metal cylinders 1.

[0036] Reference Figures 3 to 6 As shown, an array of switch parts 7 are provided in the middle of the positioning block 4 , and the switch parts 7 are used to adjust the communication state between the air guide channel 9 and the sealing part 5 .

[0037] The switching part 7 includes an array of mounting grooves 701 arranged in the middle of the positioning block 4 and connected to the air guide channel 9. A connecting channel 702 is symmetrically arranged in the middle of the mounting groove 701. One end of the connecting channel 702 is connected to the mounting groove 701, and the other end is connected to the first sealing member 502; a movable block 703 is provided inside the mounting groove 701, and an elastic member 704 connected to the second sealing member 503 is provided on the movable block 703.

[0038] The elastic member 704 includes a spring with an insulating coating sprayed thereon. The outer surface of the movable block 703 is wrapped with a rubber layer, and the outer wall of the movable block 703 is in contact with the inner wall of the installation groove 701.

[0039] Reference Figures 4 and 5 As shown, the mounting portion 5031 is provided with an array of air ducts 5033, one end of which is connected to the elastic ring 5032, and the other end is connected to the mounting groove 701. A seating groove 5034 is provided at the connection between the air duct 5033 and the mounting groove 701, and the end of the elastic member 704 away from the movable block 703 is located within the seating groove 5034.

[0040] The height of the movable block 703 is greater than the diameter of the air guide channel 9 , and the height of the movable block 703 is greater than the diameter of the connecting channel 702 .

[0041] When the movable block 703 is in the first position, the movable block 703 blocks the connecting channel 702 . At this time, the connecting channel 702 and the air guide channel 9 are in a disconnected state.

[0042] When the movable block 703 is in the second position, the movable block 703 blocks the air passage 5033 , and at this time the connecting channel 702 and the air guide channel 9 are in a communicating state.

[0043] A connection portion 8 is provided on the outside of the elastic ring 5032. This connection portion 8 is connected to an air supply device via a conduit. The conduit is equipped with a pressure detection unit for detecting the air pressure in the elastic ring 5032. The pressure detection unit includes an air pressure sensor. The air pressure sensor determines the aging status of the first and second sealing members 502, 503 by detecting the air pressure within the elastic ring 5032.

[0044] The air supply device includes an air pump, which extracts or delivers air to the elastic ring 5032 through a conduit. The air supply and extraction through the air supply device belong to the existing technology and will not be described in detail here.

[0045] The mounting portion 5031 is provided with an array of extrusion grooves 6, which are located on both sides of the vent 5033. In this embodiment, the mounting portion 5031 comprises a rubber plate. The purpose of providing the extrusion grooves 6 on the mounting portion 5031 is to reduce the thickness of the vent 5033 area, thereby better detecting whether the first sealing member 502 is damaged.

[0046] In the initial state, the elastic member 704 is in a contracted state, with its main body located in the placement groove 5034 and the movable block 703 blocking the placement groove 5034. At this time, the connecting channel 702 is connected to the air guide channel 9 through the installation groove 701.

[0047] When assembling the equipment, the positioning block 4 is connected to the metal cylinder 1. During this process, the first sealing member 502 will be squeezed against the inner wall of the metal cylinder 1, and the gas in the first sealing member 502 will be discharged through the connecting channel 702. At the same time, as the ends of the connecting flange 2 gradually approach, the connecting flange 2 will squeeze the elastic ring 5032, and the gas in the elastic ring 5032 will enter the placement groove 5034 through the air duct 5033, and push the movable block 703 to move downward step by step, so that the movable block 703 moves to the first position. When the movable block 703 moves to the first position, its outer side will complete the blocking of the connecting channel 702 (for details, please refer to Figure 5 shown).

[0048] During this process, please note the following two points: First, when the two connecting flanges 2 are brought closer together by the bolts 3, the pressure detection unit is used to determine whether the movable block 703 has completely blocked the connecting passage 702. When the value detected by the pressure detection unit reaches the set value, it indicates that the movable block 703 has completed blocking the connecting passage 702.

[0049] Secondly, after the connecting flanges 2 are connected, sulfur hexafluoride is injected into the metal cylinder 1 through the gas inlet. Due to the gas guide channel 9, the interconnected metal cylinders 1 are kept under equal pressure. During the sulfur hexafluoride injection process, the movable block 703 maintains a constant seal on the connecting channel 702 to prevent gas leakage.

[0050] In this embodiment, the air pressure value in the elastic ring 5032 is monitored in real time by means of a pressure detection unit, and the aging conditions of the first sealing member 502 and the second sealing member 503 are evaluated based on the detected air pressure value, and corresponding adaptive adjustment measures are implemented.

[0051] When the air pressure value monitored by the pressure detection unit shows a continuous downward trend, this indicates that the elastic ring 5032 may have aged and cracked, causing the internal gas to gradually overflow, thereby causing the pressure to drop. As the gas inside the elastic ring 5032 continues to leak, the thrust exerted by the gas on the movable block 703 gradually weakens, and the movable block 703 will slowly move toward the seating groove 5034, eventually reaching the second position and colliding with the seating groove 5034. Because the sulfur hexafluoride filled in the metal cylinder 1 is in a high-pressure state, during the movement of the movable block 703, this high-pressure sulfur hexafluoride will simultaneously exert a thrust on the movable block 703, causing the movable block 703 to fit more tightly with the seating groove 5034, thereby sealing the air duct 5033 and effectively preventing the sulfur hexafluoride from leaking into the elastic ring 5032 through the air duct 5033.

[0052] When the movable block 703 moves to the second position, the connection channel 702 is unblocked. At this time, the high-pressure sulfur hexafluoride inside the metal cylinder 1 flows into the first sealing member 502 through the connection channel 702, thereby enhancing the sealing performance between the first sealing member 502 and the metal cylinder 1.

[0053] When the air pressure value monitored by the pressure detection unit exceeds the set value, this indicates that the first sealing member 502 may have been damaged, causing high-pressure sulfur hexafluoride gas to penetrate into the sealed chamber formed by the mounting portion 5031, the first sealing member 502, and the connecting flange 2, thereby increasing the air pressure within the sealed chamber. This increased air pressure in the sealed chamber exerts a compressive effect on the extrusion groove 6 area, further increasing the air pressure in the air passage 5033, and ultimately increasing the air pressure inside the elastic ring 5032, thereby strengthening the tightness between the elastic ring 5032 and the connecting flange 2.

[0054] It should be noted that since elastic reinforcing ribs are provided inside the elastic ring 5032, the elastic reinforcing ribs can support the inner wall of the elastic ring 5032, thereby preventing the elastic ring 5032 from deforming and leaking when the air pressure in the closed chamber increases and the squeezing pressure on the elastic ring 5032 increases.

[0055] Furthermore, when the air pressure value monitored by the pressure detection unit exceeds a first threshold, this indicates that the air pressure within the sealed chamber is exerting excessive pressure on the extrusion groove 6 region, potentially causing the movable block 703 to move downward, thereby releasing the blockage of the connecting passage 702. At this point, the air supply device disposed outside the metal cylinder 1 will suction the air within the elastic ring 5032 to restore the internal air pressure to a set value, thereby ensuring that the movable block 703 remains in its blockage of the connecting passage 702 and preventing the two sets of connecting passages 702 from communicating with the air passage 5033.

[0056] In this embodiment, when the pressure detection unit detects aging or damage of the first sealing member 502 and the second sealing member 503, the relevant information is transmitted to the background monitoring system via the network. After receiving this information, the background monitoring system will promptly remind maintenance personnel to perform maintenance or replacement operations. Example 3

[0057] Although the above embodiment can detect seal damage, in order to reduce equipment complexity, the metal cylinders 1 between non-arcing devices are generally connected (i.e., share a gas chamber). Therefore, when a leak occurs in one of the metal cylinders 1, multiple devices will lose pressure at the same time, and the insulation strength will decrease synchronously, leading to more serious consequences. In view of this, improvements are made based on Example 2. The improved technical solution is as follows: Reference Figures 2 to 6 As shown, the present invention provides a GIS high-voltage combination electrical appliance with a high-sealing connection component. When the movable block 703 is in the third position, the movable block 703 blocks the air guide channel 9. At this time, the connecting channel 702 and the air duct 5033 are in a connected state.

[0058] When the air pressure values ​​monitored by the pressure detection units arranged on both sides of the same metal cylinder 1 show a continuous downward trend at the same time, it can be determined that the outer side of the metal cylinder 1 has been damaged, resulting in gas leakage in the shared air chamber.

[0059] If damage occurs to the exterior of the metal cylinder 1, an external gas supply device delivers gas through the connection 8 to the interior of the second sealing members 503 located on either side of the metal cylinder 1. Once the gas enters the second sealing members 503, it pushes the movable block 703 downward to the third position. When the movable block 703 is in the third position, it blocks the air channel 9, thus isolating the air chamber within the metal cylinder 1. This allows for subsequent targeted treatment and effectively prevents simultaneous pressure drops across multiple devices, preventing a simultaneous decrease in insulation strength.

[0060] When the movable block 703 is in the third position, the connecting passage 702 and the vent 5033 are in communication. At this point, the gas entering the second sealing member 503 is diverted at the junction of the mounting groove 701 and the connecting passage 702, with some of the gas entering the first sealing member 502 through the connecting passage 702. This process not only enhances the sealing performance between the first sealing member 502 and the metal cylinder 1, but also improves the tight fit between the elastic ring 5032 and the connecting flange 2.

[0061] It is important to note that if the air pressure values ​​monitored by the pressure detection units on both sides of the same connecting flange 2 simultaneously show a continuous downward trend, it indicates that a leakage problem has occurred in the connecting flange 2. In this case, an external air supply device should be used to introduce air into the second sealing members 503 on both sides of the connecting flange 2 to achieve independent isolation of the air chambers inside the two metal cylinders 1 corresponding to the connecting flange 2 for subsequent processing. This also prevents multiple devices from losing pressure at the same time and preventing a simultaneous decrease in insulation strength.

[0062] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0063] While embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A GIS high-voltage combined electrical appliance with a highly sealed connection assembly, comprising a gas-insulated substation (100), wherein the gas-insulated substation (100) comprises a plurality of metal cylinders (1) assembled and connected for protecting electrical components, wherein the metal cylinders (1) are filled with sulfur hexafluoride, and wherein: A connecting flange (2) is provided at the end of the metal cylinder (1); A positioning block (4) is provided between two opposite connecting flanges (2) and is used for coaxial positioning between the metal cylinders (1); A sealing portion (5), comprising a first sealing member (501) and a second sealing member (502), wherein the first sealing member (501) is symmetrically arranged outside the positioning block (4), and the second sealing member (502) is located in the middle of the positioning block (4); An air guide channel (9) is arranged in an array inside the positioning block (4) and is used to connect the two opposing metal cylinders (1); The switching portion (7) is distributed in an array in the middle of the positioning block (4) and is used to adjust the communication state between the air guide channel (9) and the sealing portion (5).

2. The GIS high-voltage combined electrical appliance with a high-sealing connection assembly according to claim 1, characterized in that: The switching unit (7) includes: The mounting groove (701) is arranged in the middle of the positioning block (4) and is connected to the air guide channel (9); a connecting channel (702) symmetrically distributed in the middle of the mounting groove (701) and communicating with the first sealing member (501); The movable block (703) is arranged inside the mounting groove (701) and is provided with an elastic member (704) connected to the second sealing member (502).

3. The GIS high-voltage switchgear with a high-sealing connection assembly according to claim 2, characterized in that: The second sealing member (502) comprises: The mounting portion (5021) is arranged in the middle of the positioning block (4), and has air passages (5023) arranged in an array on the mounting portion and communicating with the mounting groove (701); The elastic ring (5022) is arranged on the top of the mounting portion (5021) and is connected to the air passage (5023).

4. The GIS high-voltage switchgear with a high-sealing connection assembly according to claim 2, characterized in that: The height of the movable block (703) is greater than the diameter of the air guide channel (9), and the height of the movable block (703) is greater than the diameter of the connecting channel (702).

5. The GIS high-voltage switchgear with a high-sealing connection assembly according to claim 3, characterized in that: When the movable block (703) is in the first position, the movable block (703) blocks the connecting channel (702), and at this time the connecting channel (702) and the air guide channel (9) are in a non-connected state; When the movable block (703) is in the second position, the movable block (703) blocks the air passage (5023), and at this time the connecting channel (702) and the air guide channel (9) are in a communicating state; When the movable block (703) is in the third position, the movable block (703) blocks the air guide channel (9), and at this time the connecting channel (702) and the air duct (5023) are in a communicating state.

6. The GIS high-voltage switchgear with a high-sealing connection assembly according to claim 3, characterized in that: A placement groove is provided at the connection point between the air passage (5023) and the mounting groove (701), and one end of the elastic member (704) away from the movable block (703) is located inside the placement groove (5024).

7. The GIS high-voltage switchgear with a high-sealing connection assembly according to claim 3, characterized in that: A connecting portion (8) is provided on the outside of the elastic ring (5022), and the connecting portion (8) is connected to an air supply device via a conduit. The conduit is provided with a pressure detection unit for detecting the air pressure of the elastic ring (5022).

8. The GIS high-voltage switchgear with a high-sealing connection assembly according to claim 3, characterized in that: The mounting portion (5021) is provided with extrusion grooves (6) distributed in an array, and the extrusion grooves (6) are distributed on both sides of the air duct (5023).

9. The GIS high-voltage switchgear with a high-sealing connection assembly according to claim 3, characterized in that: An inner supporting elastic member (704) is provided inside the elastic ring (5022).

10. The GIS high-voltage switchgear with a high-sealing connection assembly according to claim 3, characterized in that: The connecting flanges (2) are connected to each other via bolt members (3) distributed in an annular array, and the diameter of the elastic ring (5022) is smaller than the diameter of the annular ring formed by the bolt members (3).

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