Vacuum arc extinguishing device
By designing the paper gap between the shield cover and the end cover in the vacuum arc extinguishing device, the problem of lack of anti-spray effect of the shield cover in the prior art is solved, and more effective arc generation blocking is achieved, and the service life and insulation performance of the insulating shell are protected.
Patent Information
- Application Number
- CN202421754908.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-23
AI Technical Summary
The existing vacuum arc extinguishing chamber shield lacks splashing effect, resulting in arc products that may still splash onto the insulated shell, affecting its service life and insulation performance.
A vacuum arc extinguishing device is designed, using an intercepting part between the shield cover, the moving end cover and the static end cover to form a paper gap to block the splashed arc product in all directions and prevent it from reaching the insulating shell.
It effectively prevents arc products from splashing onto the insulated shell, improves the service life and insulation performance of the insulated shell, and enhances the shielding effect.
Smart Images
Figure CN222826297U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of high-voltage electrical appliances, in particular to a vacuum arc extinguishing device. Background Art
[0002] In the field of high-voltage electrical appliances, high-voltage vacuum circuit breakers are the core components of high-voltage switchgear and are electrical equipment used to control and protect power systems. As the core component of high-voltage vacuum circuit breakers, vacuum interrupters control the connection and disconnection between the upper and lower contacts in the vacuum interrupters through the action of the high-voltage vacuum circuit breaker operating mechanism, thereby closing and disconnecting the circuit breaker, so that the high-voltage circuit can quickly extinguish the arc and suppress the current after the power is cut off, avoiding accidents and unexpected events.
[0003] When the vacuum interrupter is in use, it quickly extinguishes the arc through a high vacuum environment. Due to its extremely low static pressure, the vacuum arc generated by the current in the separated contact gap can be easily extinguished. When the moving contact and the static contact are separated, under the action of a high electric field, the dielectric particles around the contacts are ionized, thermally ionized, and collided to generate an arc. After the current passes through zero and the arc is extinguished, the dielectric strength of the vacuum gap is restored very quickly, so that the arc will not reignite. However, in a high vacuum environment, the trace particles and metal vapor generated by the arc will spread and splash very quickly. Even if it can be cooled quickly, there is still a risk of contaminating the shell. For this reason, the existing vacuum interrupter is designed with a shielding cover to cover the inner wall of the shell to prevent the arc products from splashing onto the covered shell. However, in order not to affect the use of the moving contact and the moving conductive rod, the two ends of the existing shielding cover are open. Even if end covers are installed on the moving conductive rod and the static conductive rod, there is still a gap between the end covers and the shielding cover along the axial direction of the vacuum chamber, resulting in a small amount of arc products still splashing outside the shielding cover, and the shielding effect is insufficient. Utility Model Content
[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a vacuum arc extinguishing device to solve the problem that the existing shielding cover is insufficient in anti-splashing effect.
[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a vacuum arc extinguishing device including an insulating shell with a hollow interior and a sealed arc extinguishing chamber, a moving conductive rod with one end slidingly inserted into the arc extinguishing chamber through a bellows seal arranged in the arc extinguishing chamber, and a static conductive rod coaxially arranged in the arc extinguishing chamber, wherein a moving contact and a static contact are respectively arranged on the ends facing each other of the moving conductive rod and the static conductive rod; a shielding cover is arranged around the arc extinguishing chamber, and a moving end cover and a static end cover are fixedly sleeved on the moving conductive rod and the static conductive rod respectively, and an interception portion that forms a circular gap to block arc products is provided between the end of the moving end cover close to the shielding cover and the other end of the static end cover and the shielding cover, so as to limit the shielding in all directions when an arc is formed, prevent the arc products from splashing onto the insulating shell and affecting the service life of the insulating shell, and reduce or even avoid pollution to the insulating shell.
[0006] Furthermore, the two intercepting parts each include a first curled edge which is curved inward from the end of the shielding cover and a second curled edge which is curved outward from the end of the two corresponding end covers away from the corresponding contacts and is curved inward from the first curled edge. The first curled edge is curved into the second curled edge, and the first curled edge and the second curled edge are both extended in opposite directions along the axial direction to form a circular gap by reverse snapping, so that splashed arc products cannot pass through, thereby protecting the insulating shell.
[0007] Furthermore, the moving end cover and the static end cover are both located inside the shielding cover, and the ends of the moving end cover and the static end cover facing each other are both open; the first curled edge is formed by extending inwardly in the radial direction from the end of the shielding cover and inwardly in the axial direction, and the second curled edge is formed by extending outwardly in the radial direction from the open end of the corresponding end cover and then in the axial direction and is directly opposite to the first curled edge and the shielding cover in the axial direction, so as to reduce the difficulty of producing the moving end cover and the static end cover.
[0008] Furthermore, a partition is fixedly provided inside the open end of the moving end cover, and one end of the bellows is sealingly connected to the partition to ensure the sealing between the moving conductive rod and the arc extinguishing chamber.
[0009] Furthermore, the shielding cover includes a first half cover and a second half cover which are detachably connected in the axial direction, and the first half cover and the second half cover both have a first curled edge on the ends facing each other, the second curled edge of the static end cover extends into the first curled edge of the first half cover, and the second curled edge of the moving end cover extends into the first curled edge of the second half cover when the moving contact is away from the static contact, thereby facilitating the assembly between the shielding cover, the moving end cover and the static end cover.
[0010] Furthermore, a moving end cover close to the moving conductive rod and a static end cover close to the static conductive rod are respectively sealed at both ends of the insulating shell, and the other end of the bellows is sealed and connected to the moving end cover so that the bellows can ensure the sealing between the moving conductive rod and the arc extinguishing chamber.
[0011] Furthermore, a cooling portion is provided on the static conductive rod to reduce the temperature in the arc extinguishing chamber by heat conduction, thereby increasing the service life of the vacuum arc extinguishing device.
[0012] Furthermore, one end of the static conductive rod away from the static contact is sealed and passes through the outside of the arc extinguishing chamber, and the cooling part includes a water tank opened inwardly along the axial direction from the end of the static conductive rod passing through the outside of the arc extinguishing chamber, and the water tank is opened to the end of the static conductive rod passing through the arc extinguishing chamber, and the static conductive rod can be cooled by installing pure water in the water tank.
[0013] Furthermore, the cooling part also includes an air storage groove opened in the axial direction from one end of the static conductive rod passing through the arc extinguishing chamber, and the air storage groove is opened to one end of the static conductive rod passing through the arc extinguishing chamber to increase the contact area between the static conductive rod and the external air, thereby improving the heat dissipation effect.
[0014] Furthermore, a shielding protrusion is provided at the end of one end of the static conductive rod passing through the arc extinguishing chamber and directly opposite the position of the gas storage tank. The gas storage tank extends into the shielding protrusion and penetrates the shielding protrusion in the radial direction to prevent rainwater from accumulating in the gas storage tank when located outdoors, and at the same time allows the gas to enter the gas storage tank more easily under the action of wind to circulate the gas in the gas storage tank.
[0015] The vacuum arc extinguishing device of the utility model has at least the following beneficial effects: the cooperation between the insulating shell, the bellows, the moving conductive rod and the static conductive rod constitutes a high vacuum environment so as to be able to quickly extinguish the arc; when the moving contact and the static contact are separated, under the action of the high electric field, the dielectric particles around the moving contact and the static contact are ionized, thermally ionized, and collided and ionized, thereby generating an arc; after the current passes through zero and the arc is extinguished, the dielectric strength of the vacuum gap is restored extremely quickly, so that the arc will not reignite; the shielding cover and the moving end cover and the intercepting part between the shielding cover and the static end cover are used to block the splashed trace particles and metal vapor in all directions, so as to avoid the contamination of the insulating shell and improve its service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0017] Figure 1 It is a schematic diagram of the structure of the vacuum arc extinguishing device of the utility model;
[0018] Figure 2 It is a front cross-sectional view of the vacuum arc extinguishing device of the utility model;
[0019] Figure 3 for Figure 2 An enlarged view of section A is shown;
[0020] Figure 4 It is a schematic diagram of the structure of the static end cover, static conductive rod and static contact of the utility model;
[0021] Figure 5 for Figure 4 An enlarged schematic diagram of part B is shown.
[0022] The meanings of the symbols in the accompanying drawings are:
[0023] Insulating housing-1; moving end cover-11; static end cover-12; arc extinguishing chamber-13; bellows-2; moving conductive rod-3; moving contact-31; static conductive rod-4; static contact-41; partition-42; shielding cover-5; first half cover-51; second half cover-52; moving end cover-6; intercepting part-7; first curling edge-71; second curling edge-72; extension section-721; shielding section-722; static end cover-8; cooling part-9; water storage tank-91; air storage tank-92; shielding protrusion-93. DETAILED DESCRIPTION
[0024] The utility model will be further described below in conjunction with the accompanying drawings.
[0025] like Figures 1 to 5As shown, the vacuum arc extinguishing device of the utility model comprises an insulating shell 1 which is hollow inside and has a sealed arc extinguishing chamber 13, a moving conductive rod 3 which is sealed and slidably arranged in the arc extinguishing chamber 13 through a bellows 2 arranged in the arc extinguishing chamber 13 at one end, a static conductive rod 4 which is coaxially arranged in the arc extinguishing chamber 13, a cooling portion 9 arranged on the static conductive rod 4, a shielding cover 5 which is annularly arranged in the arc extinguishing chamber 13, a moving end cover 6 which is fixedly sleeved on the moving conductive rod 3, a static end cover 8 which is fixedly sleeved on the static conductive rod 4, and an intercepting portion 7 which is respectively formed between the moving end cover 6 and the end close to the shielding cover 5 and between the static end cover 8 and the end close to the shielding cover 5. The insulating shell 1 is used as an insulating material to isolate the current. The bellows 2 is used to enable the moving conductive rod 3 to slide along the axial direction of the insulating shell 1 and maintain the seal in the arc extinguishing chamber 13. The moving conductive rod 3 moves axially relative to the arc extinguishing chamber 13 and completes the closing and opening actions with the static conductive rod 4, so that the moving conductive rod 3 and the static conductive rod 4 are used as current conductors for the conductive circuit of the external whole machine. The moving end cover 6, the static end cover 8, the intercepting part 7 and the shielding cover 5 are used to avoid the insulation performance of the insulating shell 1 from being reduced due to the metal vapor contamination generated when the passive conductive rod 3 and the static conductive rod 4 of the insulating shell 1 are disconnected. The setting of the intercepting part 7 enhances the more comprehensive blocking effect of arc products, thereby improving the insulation performance and service life of the insulating shell 1.
[0026] In this embodiment, the insulating housing 1 is mainly made of glass or ceramic and has a cylindrical structure to provide vacuum sealing and double insulation, and provide mechanical and insulation protection for the vacuum circuit breaker. The two ends of the insulating housing 1 are penetrated along the axial direction, and the movable end cover 11 and the static end cover 12 are respectively sealed at the two open ends of the insulating housing 1. The movable end cover 11 and the static end cover 12 are penetrated along the axial direction with a through hole, wherein one end of the static conductive rod 4 is sealed through the through hole on the static end cover 12 to be penetrated in the arc extinguishing chamber 13, and the other end of the static conductive rod 4 is passed out of the through hole, and the static conductive rod 4 is fixedly connected to the static end cover 12 so that the static conductive rod 4 always remains stationary. One end of the dynamic conductive rod 3 is movable through the through hole in the axial direction to be penetrated in the arc extinguishing chamber 13, and the other end of the dynamic conductive rod 3 is passed through the through hole and the arc extinguishing chamber 13 to cooperate with the operating mechanism. The static end cover 12 is located on a side close to the static conductive rod 4 relative to the dynamic end cover 11 , while the dynamic end cover 11 is located on a side close to the dynamic conductive rod 3 .
[0027] In this embodiment, the moving conductive rod 3 and the static conductive rod 4 are both made of oxygen-free copper. The moving conductive rod 3 is fixed with a moving contact 31 on one end extending into the arc extinguishing chamber 13, and the static conductive rod 4 is fixed with a static contact 41 on the other end extending into the arc extinguishing chamber 13. The moving contact 31 and the static contact 41 have parallel and flush contact surfaces on the sides facing each other, so that when the moving conductive rod 3 is axially moved by the operation of the operating mechanism, the two contact surfaces can be in contact or away from each other to achieve closing and opening. A circular ring-shaped partition 42 is fixedly sleeved on one end of the moving conductive rod 3 extending into the arc extinguishing chamber 13, and the partition 42 is sealed with the moving conductive rod 3, so that the connection between the inner hole of the partition 42 and the moving conductive rod 3 is a fixed sealed connection. In the content defined in this embodiment, since the opening and closing of the moving and static conductive rods 4 in the arc extinguishing chamber 13 will generate heat, and the arc extinguishing chamber 13 is a vacuum sealed chamber, resulting in poor heat dissipation effect. To this end, a cooling part 9 is provided on the static conductive rod 4, and the cooling part 9 includes a water storage tank 91 opened inwardly along the axial direction from the end of the static conductive rod 4 passing through the arc extinguishing chamber 13, and an air storage tank 92 opened in the axial direction from the end of the static conductive rod 4 passing through the arc extinguishing chamber 13. The water storage tank 91 is opened to the end of the static conductive rod 4 passing through the arc extinguishing chamber 13, and the air storage tank 92 is opened to the end of the static conductive rod 4 passing through the arc extinguishing chamber 13, so that the water storage tank 91 can accumulate rainwater or device pure water. When the temperature in the arc extinguishing chamber 13 rises, since the static conductive rod 4 has good thermal conductivity, the pure water in the water storage tank 91 can absorb heat and exchange heat, and the air storage tank 92 can increase the contact area between the static conductive rod 4 and the air, thereby improving the heat dissipation effect, thereby improving the heat dissipation performance of the entire vacuum arc extinguishing device to a certain extent and reducing the temperature in the arc extinguishing chamber 13. In this embodiment, the water storage tank 91 and the air storage tank 92 are arranged at intervals on both sides of the central axis along the radial direction of the static conductive rod 4 and are independent and not connected to each other. The radial cross-sections of the water storage tank 91 and the air storage tank 92 are both arc-shaped to have a large area. The ends of the water storage tank 91 and the air storage tank 92 close to the static contact 41 are not connected to the arc extinguishing chamber 13 to avoid contaminating the arc extinguishing chamber 13. The end of the water storage tank 91 away from the static contact 41 passes through the static conductive rod 4 in the axial direction, so that the static end cover 12 of the vacuum arc extinguishing device usually installed outdoors faces upward. When it rains outdoors, rainwater can be accumulated in the water storage tank 91, and after the water storage tank 91 is filled, the rainwater can partially circulate and replace the water in the water storage tank 91; for the vacuum arc extinguishing device installed indoors, the water storage tank 91 can also be manually filled with pure water.In order to increase the gas circulation in the gas storage groove 92 and improve the heat dissipation effect, a shielding protrusion 93 is convexly provided at the end of the static conductive rod 4 passing through the arc extinguishing chamber 13 and at a position directly opposite to the gas storage groove 92 in the axial direction. The shielding protrusion 93 covers the end of the gas storage groove 92 away from the static contact 41. The gas storage groove 92 extends into the shielding protrusion 93 and penetrates the shielding protrusion 93 in the radial direction, so that the notch of the gas storage groove 92 is connected to the outside along the side of the static conductive rod 4, so that the wind in the corresponding direction can blow into the gas storage groove 92. In order to increase the amount of air entering the gas storage groove 92, the notch of the gas storage groove 92 at the shielding protrusion 93 is in a wide-mouth shape that gradually narrows inward, so that the wind in the corresponding wind direction can more easily enter the gas storage groove 92, and its gradually narrowing notch easily increases the flow rate of the airflow entering the gas storage groove 92, so as to accelerate the gas circulation in the gas storage groove 92 and improve the heat dissipation effect.
[0028] In this embodiment, the bellows 2 is a corrugated elastic element supported by a metal thin-walled tube, one end of the bellows 2 is fixed and sealed to the movable end plate, and the other end of the bellows 2 is fixed and sealed to the partition 42. In this way, the movable conductive rod 3 can maintain the seal in the arc extinguishing chamber 13 when making axial movement.
[0029] In this embodiment, the shielding cover 5, the static end cover 8 and the moving end cover 6 are all made of oxygen-free copper. The shielding cover 5 is a cylindrical tubular structure and is coaxially arranged in the arc extinguishing chamber 13. The outer diameter of the shielding cover 5 is equal to the diameter of the arc extinguishing chamber 13 and is fixedly connected and fits the inner wall of the arc extinguishing chamber 13. The moving contact 31 and the static contact 41 are respectively inserted into the shielding cover 5 through the two ends of the shielding cover 5, so that the shielding cover 5 blocks the sides of the moving contact 31 and the static contact 41 relative to the moving contact 31 and the static contact 41. The static end cover 8 and the dynamic end cover 6 are both cylindrical and hollow inside with one end open, wherein the static end cover 8 and the dynamic end cover 6 are both open at the opposite ends, and the static end cover 8 and the dynamic end cover 6 are both located in the shielding cover 5, so that part of the arc products will be preferably blocked by the sealed end of the static end cover 8 and the dynamic end cover 6 when splashing, thereby reducing the arc products sprayed to the edges of the static end cover 8 and the shielding cover 5 and reducing the arc products sprayed to the edges of the dynamic end cover 6 and the shielding cover 5. The partition 42 on the dynamic conductive rod 3 is fixedly connected to the open end of the dynamic end cover 6.
[0030] In this embodiment, the two intercepting parts 7 each include a first curling edge 71 curved inwardly from the end of the shielding cover 5 and a second curling edge 72 curved outwardly from the end of the automatic end cover 6 and the static end cover 8 away from the corresponding contact and curved inwardly toward the first curling edge 71, the first curling edge 71 curvedly extends into the second curling edge 72, and the first curling edge 71 and the second curling edge 72 are both extended and distributed in opposite directions along the axial direction, so that a circular gap is formed between the static end cover 8 and the shielding cover 5 and between the dynamic end cover 6 and the shielding cover 5, and the splashed arc products are difficult to pass through the circular gap and are isolated in the space enclosed between the dynamic end cover 6, the static end cover 8 and the shielding cover 5, so as to avoid the products splashing onto the insulating housing 1 and affecting its insulation. In the content defined in this embodiment, the two first curling edges 71 are curved inwardly from the end of the shielding cover 5 along the radial direction toward the center line and extend inwardly toward each other along the axial direction, so that a circular ring cavity is enclosed between the first curling edge 71 and the shielding cover 5. The second curling edge 72 of the moving end cover 6 automatically extends from the open end of the end cover 6 in an arc shape outwardly in the radial direction to form an extension section 721, and then continues to extend in an arc shape in the axial direction toward the side away from the static end cover 8 to form a shielding section 722. The second curling edge 72 of the static end cover 8 extends from the open end of the static end cover 8 in an arc shape outwardly in the radial direction away from the center line to form an extension section 721, and then continues to extend in an arc shape in the axial direction toward the side away from the moving end cover 6 to form a shielding section 722. The inner and outer diameters of the shielding section 722 are both larger than the inner diameter of the first curling edge 71 and larger than the inner diameter of the shielding cover 5. The side of the shielding section 722 of the static end cover 8 away from the extension section 721 is located inside the first curling edge 71 and alternately The shielding section 722 of the moving end cover 6 is located outside the first curling edge 71 of the shielding cover 5 close to the moving end cover 11 when the moving contact 31 and the stationary contact 41 are in contact, but the shielding section 722 of the moving end cover 6 is directly opposite to the first curling edge 71 in the axial direction at this time, and when the moving contact 31 and the stationary contact 41 are separated, the extension section 721 of the moving end cover 11 moves with the moving conductive rod 3 to the corresponding first curling edge 71 to form a zigzag gap. Since the splashing of arc products is mostly straight, the zigzag gap blocks the splashing and protects the insulating housing 1, and the second curling edge 72 set in this way is easy to manufacture. In this embodiment, the partition 42 is fixedly connected to the extension section 721 of the moving end cover 6. In another embodiment, both the moving end cover 6 and the static end cover 8 can be located outside the shielding cover 5, wherein the first curled edge 71 bends radially inward from the shielding cover 5 and then extends outward in the axial direction, and the corresponding second curled edge 72 bends radially outward from the corresponding open end of the end cover and then continues to bend inward in the axial direction (i.e., toward the side of the moving contact 31 and the static contact 41) to achieve the same effect.
[0031] In this embodiment, since the inner diameter of the shielding section 722 of the second curling edge 72 is larger than the diameter of the first curling edge 71, in order to facilitate the assembly of the moving end cover 11 and the static end cover 12 in the shielding cover 5 during assembly. To this end, the shielding cover 5 includes a first half cover 51 and a second half cover 52 that are detachably connected in the axial direction, and the first half cover 51 and the second half cover 52 have a first curling edge 71 on the opposite ends, and the second curling edge 72 of the static end cover 8 extends into the first curling edge 71 of the first half cover 51, and the second curling edge 72 of the moving end cover 6 extends into the first curling edge 71 of the second half cover 52 when the moving contact 31 is away from the static contact 41. In the content defined in this embodiment, the first half cover 51 and the second half cover 52 are both cylindrical structures, and the first half cover 51 and the second half cover 52 are threaded or clamped at the opposite ends.
[0032] It should be noted that the axial directions described in the present invention are all axial directions of the insulating housing 1 .
[0033] The working mode of one embodiment of the vacuum arc extinguishing device of the utility model is as follows: when the moving conductive rod 3 moves the moving contact 31 away from the static contact 41 under the drive of the operating mechanism, the second curling edge 72 of the moving end cover 11 moves to the first curling edge 71 of the second half cover 52, and under the action of the high electric field, the dielectric particles around the moving contact 31 and the static contact 41 are ionized, thermally and collided to generate an arc, and in a vacuum environment, trace particles and metal vapor generated by the arc diffuse and are cooled, and the splashed products are blocked by the shielding cover 5, the moving end cover 6, the static end cover 8, the first curling edge 71 and the second curling edge 72 until the current passes through zero and the arc is extinguished, and the dielectric strength between the moving contact 31 and the static contact 41 is extremely quickly restored to prevent the arc from reigniting.
Claims
1. A vacuum arc extinguishing device, comprising an insulating housing with a hollow interior and a sealed arc extinguishing chamber, a moving conductive rod with one end slidingly inserted into the arc extinguishing chamber through a bellows provided in the arc extinguishing chamber, and a static conductive rod coaxially provided in the arc extinguishing chamber, wherein a moving contact and a static contact are provided on the facing ends of the moving conductive rod and the static conductive rod respectively; characterized in that: A shielding cover is provided in the inner ring of the arc extinguishing chamber, and a moving end cover and a static end cover are fixedly sleeved on the moving conductive rod and the static conductive rod respectively. An interception portion is provided between the end of the moving end cover close to the shielding cover and the other end of the static end cover and the shielding cover to form a circular gap to block arc products.
2. The vacuum arc extinguishing device according to claim 1, characterized in that: Both intercepting parts include a first curled edge that is curved inward from the end of the shielding cover and a second curled edge that is curved outward from the ends of the two corresponding end covers away from the corresponding contacts and curved inward from the first curled edge. The first curled edge extends into the second curled edge, and the first curled edge and the second curled edge are both extended in opposite directions along the axial direction.
3. The vacuum arc extinguishing device according to claim 2, characterized in that: The moving end cover and the static end cover are both located in the shielding cover, and the opposite ends of the moving end cover and the static end cover are both open; the first curled edge is formed by extending inwardly in the radial direction and inwardly in the axial direction from the end of the shielding cover, and the second curled edge is formed by extending outwardly in the radial direction from the open end of the corresponding end cover and then extending outwardly in the axial direction and is directly opposite to the first curled edge and the shielding cover in the axial direction.
4. The vacuum arc extinguishing device according to claim 3, characterized in that: A partition is fixedly provided inside the open end of the movable end cover, and one end of the bellows is sealed and connected to the partition.
5. The vacuum arc extinguishing device according to claim 4, characterized in that: The shielding cover includes a first half cover and a second half cover which are detachably connected in the axial direction. The first half cover and the second half cover both have a first curled edge on the ends facing each other. The second curled edge of the static end cover extends into the first curled edge of the first half cover. The second curled edge of the moving end cover extends into the first curled edge of the second half cover when the moving contact is away from the static contact.
6. The vacuum arc extinguishing device according to claim 4, characterized in that: A moving end cover close to the moving conductive rod and a static end cover close to the static conductive rod are respectively sealed on both ends of the insulating shell, and the other end of the bellows is sealed and connected to the moving end cover.
7. The vacuum arc extinguishing device according to claim 1, characterized in that: The static conductive rod is provided with a cooling portion.
8. The vacuum arc extinguishing device according to claim 7, characterized in that: The end of the static conductive rod away from the static contact is sealed and passes through the arc extinguishing chamber. The cooling part includes a water storage tank opened inwardly along the axial direction from the end of the static conductive rod passing through the arc extinguishing chamber. The water storage tank is opened to the end of the static conductive rod passing through the arc extinguishing chamber.
9. The vacuum arc extinguishing device according to claim 8, characterized in that: The cooling part also includes an air storage groove opened in the axial direction from one end of the static conductive rod passing through the arc extinguishing chamber, and the air storage groove is opened to one end of the static conductive rod passing through the arc extinguishing chamber.
10. The vacuum arc extinguishing device according to claim 9, characterized in that: A shielding protrusion is provided at one end of the static conductive rod passing through the arc extinguishing chamber and directly opposite to the air storage groove. The air storage groove extends into the shielding protrusion and penetrates the shielding protrusion in the radial direction.