Arc isolating structure of arc extinguish chamber

Abstract

The utility model provides an arc-isolating structure of an arc-extinguishing chamber, which comprises an arc-isolating assembly, and the arc-isolating assembly comprises an arc-extinguishing chamber body, a limiting stud, a limiting sliding rod, an arc-isolating plate, a buffer spring, a limiting ring and a sealing cover. According to the utility model, through the combined design of the limiting stud, the limiting sliding rod, the limiting ring and the limiting spring, the spacing and the pre-tightening force of the flash barriers can be conveniently adjusted, and the compression degree of the limiting spring is changed by rotating the limiting ring, so that different arc characteristics and arc extinguishing requirements can be adapted, and the universality and the adaptability of the arc extinguishing chamber are improved; the vent holes distributed in the flash barrier in a staggered manner can promote gas flow in the arc extinguish chamber, the arc is divided into a plurality of small arcs, the surface area of the small arcs is increased, the small arcs are in full contact with surrounding air or arc extinguishing media, heat dissipation and cooling are accelerated, arc development is inhibited, meanwhile, the insulating protruding strips prevent the arc from being conducted along the edge of the flash barrier, and the arc extinguishing effect is improved. The arc can only pass through the vent holes, the arc isolation effect is enhanced, and the arc energy is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to an arc-extinguishing chamber arc-isolating structure. Background Technology

[0002] During the operation of various electrical equipment, when the circuit is connected or disconnected, an electric arc is often generated at the contact separation point due to the presence of inductors, capacitors, and changes in voltage and current. An electric arc is essentially a high-temperature, highly conductive plasma with extremely high temperature and energy. If the arc cannot be extinguished in time, it will not only continuously consume electrical energy but may also cause severe erosion of the contacts, reducing their lifespan and potentially leading to serious faults such as phase-to-phase short circuits or ground faults, threatening the safe and stable operation of the electrical equipment. The arc-extinguishing chamber, as a crucial component of electrical equipment, has the core function of effectively extinguishing these arcs. Through specific structural design and physical principles, the arc-extinguishing chamber employs a series of measures, such as elongating the arc, cooling the arc, and dividing the arc, to promote rapid extinguishing of the arc, thereby ensuring the normal switching operation of the electrical equipment and guaranteeing the reliable operation of the entire electrical system.

[0003] However, existing arc-extinguishing chamber structures have some shortcomings. For example, the fixing method of the arc-extinguishing plate in some structures is not flexible enough, making it difficult to adjust according to the actual arc conditions, resulting in poor arc-extinguishing effect. In addition, some arc-extinguishing structures lack effective buffering measures, making the arc-extinguishing plate easily damaged during arc impact, thus shortening its service life. At the same time, the gas flow design of existing arc-extinguishing chamber structures is not reasonable enough, which is not conducive to arc cooling and extinction. Furthermore, the insulation performance of some arc-extinguishing chamber structures needs to be improved, and insulation breakdown may occur under high-voltage environments, affecting the safe operation of electrical equipment. Utility Model Content

[0004] In view of this, the present invention aims to provide an arc-extinguishing chamber arc-isolating structure to solve or alleviate the technical problems existing in the prior art, or at least provide a beneficial alternative.

[0005] The technical solution of this utility model embodiment is implemented as follows: an arc-extinguishing chamber arc-isolating structure, including an arc-isolating component, the arc-isolating component including an arc-extinguishing chamber body, a limiting stud, a limiting slide rod, an arc-isolating plate, a buffer spring, a limiting ring, a limiting spring, a vent hole, an insulating protrusion strip, a screw and a sealing cover;

[0006] Limiting studs penetrate the center of the front and rear surfaces of the arc-extinguishing chamber body. Limiting slide rods are threadedly connected to the outer side of the outer walls of two limiting studs that are close to each other. Multiple arc-blocking plates are slidably connected to the outer side of the limiting slide rod. Multiple buffer springs are sleeved in the middle of the outer side of the limiting slide rod. The two ends of each buffer spring are fixedly connected to the outer side of the adjacent arc-blocking plates near the limiting slide rod. Limiting rings are threaded to both ends of the outer side of the limiting slide rod. Limiting springs are fixedly connected to the adjacent side of the two limiting rings. Multiple vent holes are staggered on the front surface of the arc-blocking plates. Insulating protrusions are provided on the outer sides of both the front and rear surfaces of the arc-blocking plates. A sealing cap is fixedly connected to the upper surface of the arc-extinguishing chamber body near the upper part of the arc-blocking plates by multiple screws.

[0007] More preferably, the inner bottom wall of the arc-extinguishing chamber body is provided with lower limit grooves on both sides, the lower surface of the arc-isolating plate is fixedly connected to both sides with lower limit blocks, the outer side wall of the lower limit block is slidably connected to the inner side wall of the lower limit groove, the lower surface of the sealing cover is provided with two upper limit grooves on the side near the arc-isolating plate, the upper surface of the arc-isolating plate is fixedly connected to both sides with upper limit blocks, the outer side wall of the upper limit block is slidably connected to the inner side wall of the upper limit groove.

[0008] In a further preferred embodiment, a disassembly knob is welded to the far ends of the two limiting studs.

[0009] More preferably, an arc inlet is provided on one side of the arc extinguishing chamber body, and an installation plate is slidably connected to the inner side wall of the arc extinguishing chamber body away from the arc inlet. A plurality of arc extinguishing grids are provided on the side of the installation plate near the arc inlet.

[0010] More preferably, the inner bottom wall of the arc-extinguishing chamber body and the lower surface of the sealing cover are provided with limit slots on the side near the mounting plate, and the top and bottom of the outer side wall of the mounting plate are slidably connected to the inner side walls of the two limit slots respectively.

[0011] More preferably, mounting holes are provided on the upper and lower surfaces of the arc-extinguishing chamber body near the arc inlet, and conductive rods penetrate through the interior of the two mounting holes. The main contact and the arc contact are respectively fixedly connected to the adjacent ends of the two conductive rods.

[0012] More preferably, an insulating sleeve is fixedly connected to the inner wall of the mounting hole, and the inner wall of the insulating sleeve is fixedly connected to the outer wall of the conductive rod.

[0013] More preferably, an insulating sealing gasket is fixedly connected to the outer side of the lower surface of the sealing cover, and the lower surface of the insulating sealing gasket is attached to the upper surface of the arc-extinguishing chamber body near the arc-isolating plate.

[0014] The present invention has the following advantages due to the adoption of the above technical solution:

[0015] 1. This utility model, through the combined design of limiting studs, limiting slides, limiting rings and limiting springs, makes it easy to adjust the spacing and preload of the arc-quenching plates. By rotating the limiting ring to change the compression degree of the limiting spring, it can adapt to different arc characteristics and arc extinguishing requirements, thus improving the versatility and adaptability of the arc-quenching chamber.

[0016] 2. This utility model promotes gas flow in the arc-extinguishing chamber through the staggered ventilation holes on the arc-isolating plate, dividing the electric arc into multiple small arcs. The surface area of ​​the small arcs increases, allowing for more thorough contact with the surrounding air or arc-extinguishing medium, accelerating heat dissipation and cooling, and inhibiting arc development. At the same time, the insulating protrusions prevent the arc from conducting along the edge of the arc-isolating plate, ensuring that the arc can only pass through the ventilation holes, enhancing the arc isolation effect, and further reducing the arc energy.

[0017] 3. This utility model uses a mounting plate to slide with the arc-extinguishing chamber body and sealing cover through a limiting slot. The limiting studs fix the limiting slide rod and the arc-extinguishing plate on it, which makes the installation and disassembly operations simple and facilitates the adjustment, inspection and replacement of components such as the arc-extinguishing plate and arc-extinguishing grid, thus reducing maintenance costs and time.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an overall structural diagram of the present invention;

[0021] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0022] Figure 3 This is a structural diagram of the internal structure of the arc-extinguishing chamber of this utility model;

[0023] Figure 4 This is a structural diagram of the limiting slide bar and the arc-blocking plate of this utility model.

[0024] Reference numerals: 1. Arc isolation assembly; 11. Arc extinguishing chamber body; 12. Limiting stud; 13. Limiting slide rod; 14. Arc isolation plate; 15. Buffer spring; 16. Limiting ring; 17. Limiting spring; 18. Vent hole; 19. Insulating protrusion strip; 20. Screw; 21. Sealing cover; 22. Lower limiting groove; 23. Lower limiting block; 24. Upper limiting groove; 25. Upper limiting block; 26. Arc inlet; 27. Mounting plate; 28. Arc extinguishing grid; 29. ​​Limiting slot; 30. Mounting hole; 31. Conductive rod; 32. Main contact; 33. Arc contact; 34. Insulating sleeve; 35. Insulating sealing gasket; 36. Disassembly knob. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0026] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0027] like Figures 1-4 As shown, this utility model embodiment provides an arc-extinguishing chamber arc-isolating structure, including an arc-isolating component 1. The arc-isolating component 1 includes an arc-extinguishing chamber body 11, a limiting stud 12, a limiting slide rod 13, an arc-isolating plate 14, a buffer spring 15, a limiting ring 16, a limiting spring 17, a vent hole 18, an insulating protrusion strip 19, a screw 20, and a sealing cover 21.

[0028] Limiting studs 12 penetrate the center of both the front and rear surfaces of the arc-extinguishing chamber body 11. Limiting slide rods 13 are threadedly connected to the adjacent sides of the outer walls of the two limiting studs 12. Multiple arc-damping plates 14 are slidably connected to the outer walls of the limiting slide rods 13. Multiple buffer springs 15 are sleeved in the middle of the outer walls of the limiting slide rods 13. The two ends of each buffer spring 15 are fixedly connected to the adjacent sides of two adjacent arc-damping plates 14 near the outer side of the limiting slide rod 13. Limiting rings 16 are threadedly connected to both ends of the outer walls of the limiting slide rods 13. Limiting springs 17 are fixedly connected to the adjacent sides of two limiting rings 16. Multiple vent holes 18 are staggered on the front surface of the arc-damping plates 14. Insulating protrusions 19 are provided on both the outer and rear surfaces of the arc-extinguishing chamber body 11. A sealing cover 21 is fixedly connected to the upper part of the arc-extinguishing plate 14 near the upper part of the upper surface of the arc-extinguishing chamber body 11 by multiple screws 20. The arc-extinguishing plate 14 is one of the core components of the arc-extinguishing chamber's arc-extinguishing structure. When an electric arc enters the arc-extinguishing chamber, the arc-extinguishing plate 14 can block the spread of the arc, confining it to a certain area and preventing damage to other components of the arc-extinguishing chamber. Multiple vent holes 18, staggered on the front surface of the arc-extinguishing plate 14, can promote gas flow within the arc-extinguishing chamber. When the arc passes through the vent holes 18, it is divided into multiple small arcs. The surface area of ​​the small arcs increases, allowing for more thorough contact with the surrounding air or arc-extinguishing medium, accelerating heat dissipation and cooling. Simultaneously, the edges of the arc-extinguishing plate 14... The insulating protrusion 19 prevents the arc from conducting along the edge of the arc-blocking plate 14, ensuring that the arc can only pass through the vent hole 18, thus enhancing the arc-blocking effect and further reducing the arc energy. The buffer spring 15 is selected from springs with an elastic modulus between 50-100 N / m to ensure that it can effectively absorb the impact force during arc impact, protecting the arc-blocking plate 14. The spring is made of high-strength alloy spring steel, ensuring that it is not prone to fatigue fracture under frequent impact and has a long service life. The buffer spring 15 is sleeved on the middle of the outer wall of the limiting slide rod 13, and its two ends are respectively fixedly connected to the side of two adjacent arc-blocking plates 14 that are close to each other. When the arc impacts the arc-blocking plate 14, the buffer spring 15 can absorb the impact force and reduce the impact of the arc on the arc-blocking plate 14. The direct action protects the arc-blocking plate 14 from damage, while also reducing collisions and wear between the arc-blocking plates 14, thus extending their service life. The limiting ring 16 is threaded to both ends of the outer wall of the limiting slide rod 13. Its position on the limiting slide rod 13 can be adjusted by rotating the limiting ring 16. The combination of the limiting ring 16 and the limiting spring 17 can limit and pre-tighten the arc-blocking plate 14. The limiting spring 17 is selected with an elastic coefficient between 30-60 N / m. By adjusting the position of the limiting ring 16, the compression degree of the limiting spring 17 can be changed, thereby adjusting the distance between the arc-blocking plates 14 and the pre-tightening force of the arc-blocking plates 14 to adapt to different working conditions and arc extinguishing requirements.

[0029] In one embodiment, specifically: lower limit grooves 22 are provided on both sides of the middle of the inner bottom wall of the arc-extinguishing chamber body 11; lower limit blocks 23 are fixedly connected to both sides of the lower surface of the arc-extinguishing plate 14; the outer side wall of the lower limit block 23 is slidably connected to the inner side wall of the lower limit groove 22; two upper limit grooves 24 are provided on the lower surface of the sealing cover 21 near the arc-extinguishing plate 14; upper limit blocks 25 are fixedly connected to both sides of the upper surface of the arc-extinguishing plate 14; the outer side wall of the upper limit block 25 is slidably connected to the inner side wall of the upper limit groove 24; the lower limit grooves 22 and upper limit grooves 24 respectively limit the lower limit blocks 23 and upper limit blocks 25 on the arc-extinguishing plate 14, thereby limiting the arc-extinguishing plate 14 and enhancing the stability of the arc-extinguishing plate 14.

[0030] In one embodiment, specifically: a disassembly knob 36 is welded to the far ends of the two limiting studs 12. By rotating the disassembly knob 36, the limiting studs 12 are rotated, which facilitates the removal of the limiting studs 12, thereby releasing the limitation on the limiting slide rod 13, and facilitating the removal of the limiting slide rod 13 and the arc-blocking plate 14 on it from the inside of the arc-extinguishing chamber body 11 for cleaning and maintenance.

[0031] In one embodiment, specifically: an arc inlet 26 is provided on one side of the arc-extinguishing chamber body 11; an mounting plate 27 is slidably connected to the inner wall of the arc-extinguishing chamber body 11 away from the arc inlet 26; a plurality of arc-extinguishing grids 28 are provided on the side of the mounting plate 27 near the arc inlet 26; the mounting plate 27 is slidably connected to the inner wall of the arc-extinguishing chamber body 11 away from the arc inlet 26, thereby facilitating the installation, disassembly, and maintenance of the mounting plate 27; wherein the arc-extinguishing grids 28 on the mounting plate 27 are key components in the arc-extinguishing process, they are neatly arranged on the mounting plate 27, waiting to process the arc entering the arc-extinguishing chamber; when the arc enters the arc-extinguishing chamber body 11, firstly First, the arc is initially blocked and divided by the arc baffle 14. The arc is divided into multiple small arcs through the vent 18, reducing the arc energy. Then, these small arcs continue to move forward to the arc extinguishing grid 28 on the mounting plate 27. Due to the initial treatment by the arc baffle 14, the arc shape is more conducive to further division by the arc extinguishing grid 28. The arc extinguishing grid 28 divides the arc into multiple short arcs. Taking advantage of the large voltage drop of the short arcs, the voltage at both ends of the arc is insufficient to maintain combustion, thereby accelerating the extinction of the arc. During this process, the buffer spring 15 and the limiting structure of the arc baffle 14 ensure its stability, providing stable preconditions for the operation of the arc extinguishing grid 28, and together achieving efficient arc extinguishing.

[0032] In one embodiment, specifically: the inner bottom wall of the arc-extinguishing chamber body 11 and the lower surface of the sealing cover 21 near the mounting plate 27 are both provided with limiting slots 29. The top and bottom of the outer side wall of the mounting plate 27 are slidably connected to the inner side walls of the two limiting slots 29, respectively. The limiting slots 29 provide a precise installation position for the mounting plate 27. The mounting plate 27 is provided with a plurality of arc-extinguishing grids 28. The arc-extinguishing grids 28 play a key role in the arc extinguishing process and need to be accurately positioned in a specific position within the arc-extinguishing chamber body 11 to ensure effective arc segmentation. Through the cooperation between the limiting slots 29 and the mounting plate 27, it can be ensured that the mounting plate 27 is in the correct position every time it is installed, so that the arc-extinguishing grids 28 can perform at their best.

[0033] In one embodiment, specifically: mounting holes 30 are provided on the upper and lower surfaces of the arc-extinguishing chamber body 11 near the arc inlet 26. Conductive rods 31 pass through the interior of each mounting hole 30. The adjacent ends of the two conductive rods 31 are respectively fixedly connected to a main contact 32 and an arc contact 33. The conductive rods 31 conduct current; by passing through the mounting holes 30, they achieve electrical connection between the internal contacts of the arc-extinguishing chamber and the external circuit. The mounting holes 30 provide a position for the conductive rods 31 to be installed and fixed, ensuring that the conductive rods 31 can be stably positioned within the arc-extinguishing chamber body 11. On the upper part, the two conductive rods 31 are fixedly connected to the main contact 32 and the arc contact 33 at their close ends. The main contact 32 and the arc contact 33 are the key components for circuit opening and closing. During normal operation, the main contact 32 undertakes most of the current conduction task. At the moment of circuit disconnection, the arc contact 33 separates from the main contact 32 first, transferring the electric arc from the main contact 32 to protect the main contact 32 from severe burning by the electric arc. Through the connection of the conductive rods 31, the main contact 32 and the arc contact 33 can form a complete current path with the external circuit to realize the normal opening and closing function of the circuit.

[0034] In one embodiment, specifically: an insulating sleeve 34 is fixedly connected to the inner wall of the mounting hole 30, and the inner wall of the insulating sleeve 34 is fixedly connected to the outer wall of the conductive rod 31. The insulating sleeve 34 isolates the connection between the conductive rod 31 and the arc-extinguishing chamber body 11, thereby ensuring that the conductive rod 31 is insulated from the arc-extinguishing chamber body 11 and preventing leakage.

[0035] In one embodiment, specifically: an insulating sealing gasket 35 is fixedly connected to the outer side of the lower surface of the sealing cover 21. The lower surface of the insulating sealing gasket 35 is attached to the upper surface of the arc-extinguishing chamber body 11 near the arc-blocking plate 14. The insulating sealing gasket 35 provided at the connection between the sealing cover 21 and the arc-extinguishing chamber body 11 can effectively prevent external impurities from entering the arc-extinguishing chamber, while enhancing the overall insulation performance and ensuring the safe and stable operation of electrical equipment.

[0036] In operation, this invention works as follows: When the circuit of the electrical equipment is switched on or off, the main contact 32 and the arc contact 33 separate to generate an electric arc. After the arc enters the arc-extinguishing chamber body 11, it first contacts the arc-isolating plate 14. Considering different working environments, the arc-extinguishing chamber body 11 is made of high-temperature and moisture-resistant materials to ensure stable operation even in high-temperature and high-humidity environments. Simultaneously, the vent 18 is specially designed to ensure good gas flow under different altitude conditions, maintaining stable arc-extinguishing performance. For example, in high-altitude areas where the air is thin, optimizing the shape and layout of the vent 18 increases the gas flow rate, ensuring… The high-temperature gas generated by the electric arc can be discharged in time, and cold air from the outside can also enter smoothly to cool the arc. The staggered vent holes 18 on the arc-blocking plate 14 allow the high-temperature gas generated by the arc to be discharged quickly, while cold air from the outside enters to cool the arc and inhibit its development. When the arc impacts the arc-blocking plate 14, the buffer spring 15 on the limiting slide rod 13 plays a role in reducing the impact force, protecting the arc-blocking plate 14, and ensuring its stability and arc-blocking effect. In addition, the arc-blocking plate 14 is precisely positioned by the lower limiting block 23 cooperating with the lower limiting groove 22 on the inner bottom wall of the arc-extinguishing chamber body 11, and the upper limiting block 25 cooperating with the upper limiting groove 24 on the lower surface of the sealing cover 21, thus avoiding... Without deviation, after initial treatment by the arc-isolating plate 14, the arc continues to move forward, reaching the arc-extinguishing grid 28 on the mounting plate 27. The arc-extinguishing grid 28 divides the arc into multiple short arcs, utilizing the characteristics of short arcs to accelerate arc extinguishing. Due to the large voltage drop of the short arcs, when the arc is divided into multiple short arcs, the voltage at both ends of the arc is insufficient to sustain the arc's combustion, thus causing the arc to extinguish rapidly and further enhancing the arc-extinguishing effect. During equipment maintenance, if it is necessary to adjust the spacing of the arc-isolating plates 14 or replace parts, the limiting ring 16 on the limiting slide rod 13 can be rotated to compress or release the buffer spring 15 and the limiting spring 17, changing the spring length to achieve [the desired effect]. The arc-isolating plate 14 is adjusted, and the mounting plate 27 is connected to the arc-extinguishing chamber body 11 and the sealing cover 21 through the limiting slot 29, which facilitates the disassembly and replacement of the mounting plate 27 and the arc-extinguishing grid plate 28, and facilitates the maintenance and upgrading of the arc-extinguishing chamber. In order to ensure the safe operation of electrical equipment, the arc-isolating structure of the arc-extinguishing chamber is equipped with an overcurrent protection device. When the current exceeds the set threshold, the circuit is automatically cut off to prevent safety accidents caused by excessive current. At the same time, an arc detection sensor is installed inside the arc-extinguishing chamber body 11. Once an arc abnormality is detected, the backup arc-extinguishing measures are immediately activated, such as spraying arc-extinguishing medium, to ensure that the arc can be extinguished in time and to protect the safety of equipment and personnel.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An arc-extinguishing chamber arc-isolating structure, characterized in that: The arc-blocking assembly (1) includes an arc-extinguishing chamber body (11), a limiting stud (12), a limiting slide bar (13), an arc-blocking plate (14), a buffer spring (15), a limiting ring (16), a limiting spring (17), a vent hole (18), an insulating protrusion strip (19), a screw (20), and a sealing cap (21). Limiting studs (12) penetrate the center of both the front and rear surfaces of the arc-extinguishing chamber body (11). Limiting slide rods (13) are threadedly connected to the outer side of the two limiting studs (12) that are close to each other. Multiple arc-blocking plates (14) are slidably connected to the outer side of the limiting slide rods (13). Multiple buffer springs (15) are sleeved in the middle of the outer side of the limiting slide rods (13). The two ends of the buffer springs (15) are respectively fixedly connected to the adjacent side of two adjacent arc-blocking plates (14) near the limiting slide rods (13). On the outside, the two ends of the outer wall of the limiting slide rod (13) are threaded with limiting rings (16), and the two limiting rings (16) are fixedly connected to the adjacent side of each other with limiting springs (17). The front surface of the arc extinguishing plate (14) is provided with a plurality of ventilation holes (18) in an alternating manner. The outer sides of the front and rear surfaces of the arc extinguishing plate (14) are provided with insulating protrusions (19). The upper surface of the arc extinguishing chamber body (11) near the upper part of the arc extinguishing plate (14) is fixedly connected with a sealing cover (21) by a plurality of screws (20).

2. The arc-extinguishing chamber arc-isolating structure according to claim 1, characterized in that: The inner bottom wall of the arc-extinguishing chamber body (11) is provided with lower limit grooves (22) on both sides. The lower surface of the arc-blocking plate (14) is fixedly connected to both sides with lower limit blocks (23). The outer side wall of the lower limit block (23) is slidably connected to the inner side wall of the lower limit groove (22). The lower surface of the sealing cover (21) is provided with two upper limit grooves (24) on the side near the arc-blocking plate (14). The upper surface of the arc-blocking plate (14) is fixedly connected to both sides with upper limit blocks (25). The outer side wall of the upper limit block (25) is slidably connected to the inner side wall of the upper limit groove (24).

3. The arc-extinguishing chamber arc-isolating structure according to claim 1, characterized in that: The two limiting studs (12) are each welded with a disassembly knob (36) at their far ends.

4. The arc-extinguishing chamber arc-isolating structure according to claim 1, characterized in that: An arc inlet (26) is provided on one side of the arc extinguishing chamber body (11). An installation plate (27) is slidably connected to the inner side wall of the arc extinguishing chamber body (11) away from the arc inlet (26). A plurality of arc extinguishing grids (28) are provided on the side of the installation plate (27) near the arc inlet (26).

5. The arc-extinguishing chamber arc-isolating structure according to claim 4, characterized in that: Limit slots (29) are provided on the inner bottom wall of the arc extinguishing chamber body (11) and the lower surface of the sealing cover (21) near the mounting plate (27). The top and bottom of the outer side wall of the mounting plate (27) are slidably connected to the inner side wall of the two limit slots (29).

6. The arc-extinguishing chamber arc-isolating structure according to claim 4, characterized in that: The upper and lower surfaces of the arc-extinguishing chamber body (11) are provided with mounting holes (30) on the side near the arc inlet (26). A conductive rod (31) passes through the interior of each of the two mounting holes (30). The main contact (32) and the arc contact (33) are fixedly connected to the adjacent ends of the two conductive rods (31).

7. The arc-extinguishing chamber arc-isolating structure according to claim 6, characterized in that: An insulating sleeve (34) is fixedly connected to the inner wall of the mounting hole (30), and the inner wall of the insulating sleeve (34) is fixedly connected to the outer wall of the conductive rod (31).

8. The arc-extinguishing chamber arc-isolating structure according to claim 1, characterized in that: An insulating sealing gasket (35) is fixedly connected to the outer side of the lower surface of the sealing cover (21), and the lower surface of the insulating sealing gasket (35) is attached to the side of the upper surface of the arc extinguishing chamber body (11) near the arc quenching plate (14).

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