Double-break upper isolation circuit breaker

Abstract

This utility model provides a double-break top-disconnecting circuit breaker, including a mounting frame. Within the mounting frame, from top to bottom, are arranged an isolation assembly, a moving knife switch assembly, and a vacuum bulb assembly. The isolation assembly includes an upper isolation beam and three L-shaped conductors. Four annular ribs are spaced apart on the upper isolation beam. Each L-shaped conductor is inserted between two annular ribs. The horizontal section of the L-shaped conductor forms a large busbar overlap, and the vertical section penetrates the upper isolation beam and is exposed to form the upper stationary contact of the disconnecting switch. The vacuum bulb assembly includes an environmentally friendly vacuum base with three vacuum bulb fixing shells integrally formed at the upper end, a vacuum bulb disposed within each vacuum bulb fixing shell, and a metal cover component disposed at the upper opening of each vacuum bulb fixing shell. The lower end of each vacuum bulb is connected to a vacuum bracket. This utility model relates to the field of circuit breaker technology.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a double-break on-site isolating circuit breaker. Background Technology

[0002] Currently, the switch body of 10KV environmental protection cabinets generally adopts a double-break isolating circuit breaker structure. Its core components include vacuum bulb, isolating switch and busbar connection structure. In the existing technology, the lower cam of the vacuum bulb adopts an open design, and the phase-to-phase insulation is achieved by silicone rubber sheds. The upper stationary contact of the vacuum bulb is sealed with epoxy board. The upper crossbeam of the isolating switch increases the creepage distance with dense small ribs and uses prefabricated inserts to fix the busbar. The moving knife of the isolating switch is limited and insulated by movable sheds, and the fixed end of the flexible connection relies on air insulation. Although this structure can meet the basic functions, it has significant defects in insulation reliability, conductivity and assembly process.

[0003] The shortcomings of existing technologies are mainly manifested in the following ways: the installation position and process of silicone rubber skirts directly affect insulation performance—fluctuations in installation position lead to unstable interphase insulation distances, and the fit gap between the skirts and the hexagonal shaft can easily cause partial discharge; when epoxy boards are used to seal the stationary contacts on the vacuum bubble, the metal fasteners form suspended charged bodies, exacerbating the risk of partial discharge; although the dense small ribs on the crossbeam of the disconnector increase the creepage distance, they also compress the busbar overlap area and reduce the current carrying capacity; the skirt assembly process is complex and the insulation consistency is poor; the flexible connection relies solely on air insulation, resulting in insufficient interphase insulation strength, which restricts product miniaturization.

[0004] Therefore, the inventors urgently need a double-break on-site isolating circuit breaker to solve systemic defects such as uncontrollable silicone rubber skirt insulation, floating discharge, insufficient busbar lap surface, and weak flexible connection insulation. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a double-break top-disconnect circuit breaker, aiming to solve the systemic defects of the existing double-break circuit breaker caused by uncontrollable silicone rubber skirt insulation, floating discharge caused by epoxy board sealing, insufficient current carrying capacity due to dense small ribs squeezing the busbar lap surface, and weak air insulation of flexible connection.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a double-break top-disconnecting circuit breaker, comprising a mounting frame, wherein an isolation component, a moving knife switch component, and a vacuum bulb component are arranged sequentially from top to bottom within the mounting frame. The isolation component includes an upper isolation beam and three L-shaped conductors. Four annular rib groups are spaced apart on the upper isolation beam. Each L-shaped conductor is inserted between two annular rib groups. The horizontal section of the L-shaped conductor forms a large-area busbar overlap, and the vertical section penetrates the upper isolation beam and is exposed to form the upper stationary contact of the disconnecting switch. The vacuum bulb component includes an environmentally friendly vacuum base with three vacuum bulb fixing shells integrally formed at the upper end, a vacuum bulb disposed in each vacuum bulb fixing shell, and a metal sealing component disposed at the upper opening of the vacuum bulb fixing shell. A vacuum bracket is connected to the lower end of the vacuum bulb. An isolation cover is snapped into the bottom end of the environmentally friendly vacuum base corresponding to each vacuum bracket. A flexible connecting piece is led out between the vacuum bulb and the vacuum bracket, and a wire cap is provided at the end of the flexible connecting piece.

[0007] Based on the above, the beneficial effect of a double-break top-disconnect circuit breaker is to solve the systemic defects of existing double-break circuit breakers caused by uncontrollable silicone rubber shed insulation, floating discharge caused by epoxy board sealing, insufficient current carrying capacity due to dense small ribs squeezing the busbar lap surface, and weak air insulation of flexible connections; mainly reflected in: 1. This utility model uses an isolation cover with a concave-convex structure to snap onto the bottom of the environmentally friendly vacuum seat, completely covering the vacuum support and replacing the open design of the silicone rubber umbrella skirt. This achieves physical isolation between phases for insulation. The vertical slots on both sides are fitted with the hexagonal shaft with a gap to avoid the influence of the assembly process on the insulation distance and ensure stable and reliable insulation performance. 2. This utility model uses a metal cap component fixed to the upper opening of the vacuum bulb fixing shell to directly cover the metal connection part of the stationary contact on the vacuum bulb, limiting the stationary contact on the vacuum bulb and making the metal cap and the stationary contact on the vacuum bulb form an equipotential connection. This avoids the floating of the fixing screw on the metal connection part of the stationary contact on the vacuum bulb caused by the use of epoxy board sealing in the prior art. At the same time, the tight fit between the metal cap and the stationary contact on the vacuum bulb optimizes the electric field distribution and completely eliminates the risk of partial discharge. 3. This utility model isolates the four annular rib groups of the upper crossbeam and the inserted L-shaped conductor. The spacing between the annular rib groups is much larger than the width of the rib strip, forming a large creepage distance insulation structure. The horizontal section of the L-shaped conductor constitutes a large area busbar overlap part, which is completely exposed between the annular rib groups. The overlap area of ​​the busbar is increased by more than 30% compared with the original prefabricated insert busbar, which significantly improves the current carrying capacity. 4. This utility model connects the copper foil fixing end of the flexible connector piece with a wire cap, transforming the original air-insulated flexible connector fixing end into a solid insulation encapsulation structure. Combined with the protection of the vacuum bracket by the isolation cover, it significantly improves the phase-to-phase insulation strength and supports the miniaturization design of the product.

[0008] Furthermore, the mounting frame includes a first mounting plate and a second mounting plate arranged in parallel. The lower end of the second mounting plate extends longer than the first mounting plate. The moving knife switch assembly includes a double-break epoxy rod connecting the first mounting plate and the second mounting plate, three isolating moving knife switch structures sleeved on the double-break epoxy rod, a hexagonal fixing sleeve that limits the three isolating moving knife switch structures near the first mounting plate, and a moving knife limiting cover that limits the three isolating moving knife switch structures near the second mounting plate. Each isolating moving knife switch structure corresponds one-to-one with the position of the stationary contact on the disconnect switch.

[0009] Based on the above, the beneficial effects of the first and second mounting plates are that they form a rigid mounting base by being arranged in parallel, and the lower extension length of the second mounting plate is greater than that of the first mounting plate, providing a through space for the hexagonal shaft, thus achieving precise positioning of the internal moving parts of the circuit breaker and the fixed frame; the beneficial effect of the double-break epoxy rod is that it connects the first and second mounting plates and supports the three isolating switch structures, achieving synchronous rotation insulation support for the switch assemblies; the beneficial effect of the three isolating switch structures is that they are sleeved on the double-break epoxy rod and are connected to the stationary contacts of the three disconnect switches and the three... The stationary contacts on the vacuum bulb correspond one-to-one, achieving precise alignment and reliable switching with the stationary contacts on the disconnecting switch and the vacuum bulb during opening and closing operations. The beneficial effect of the hexagonal fixing sleeve is to limit the axial position of the three isolating knife switch structures adjacent to the first mounting plate, preventing the knife switch from moving towards the first mounting plate side, thus achieving axial fixation on one side of the knife switch assembly. The beneficial effect of the knife switch limiting cover is to limit the axial position of the three isolating knife switch structures adjacent to the second mounting plate, forming a bidirectional constraint with the hexagonal fixing sleeve, thus achieving stable stroke control of the knife switch assembly on the double-break epoxy rod.

[0010] Furthermore, the isolating moving knife switch structure includes a moving knife limiting sleeve sleeved on a double-break epoxy rod and an isolating moving knife switch connected to the moving knife limiting sleeve, and the isolating moving knife switch has two closing parts located at both ends.

[0011] Based on the above, the beneficial effect of the moving knife limit sleeve is that it is sleeved on the double-break epoxy rod and fixes the installation position of the isolating moving knife switch; the beneficial effect of the isolating moving knife switch is that it connects the moving knife limit sleeve and extends to the stationary contact on the isolating switch and the stationary contact on the vacuum bulb, and achieves engagement / disengagement with the stationary contact on the isolating switch and the stationary contact on the vacuum bulb by swinging around the double-break epoxy rod, thus completing the on / off control of the load circuit.

[0012] Furthermore, the lower end of the environmentally friendly vacuum seat is integrally formed with three vacuum bracket protective shells, each vacuum bracket protective shell covering the corresponding vacuum bracket, and the isolation cover is snapped onto the bottom of the vacuum bracket protective shell.

[0013] Based on the above, the beneficial effects of the vacuum bracket protective shell are that it is integrally formed at the lower end of the environmentally friendly vacuum seat and covers the vacuum bracket, realizing phase-to-phase physical isolation and controllable creepage distance of the vacuum bracket; the beneficial effects of the isolation cover are that it is fixed to the bottom of the vacuum bracket protective shell through a snap-fit ​​structure, playing a role in phase separation and insulation.

[0014] Furthermore, the lower end of the vacuum bracket is provided with a cam sleeve, and the lower end of the second mounting plate is provided with a hexagonal shaft, the other end of which passes through the three cam sleeves in sequence.

[0015] Furthermore, the isolation cover is a protective cover with a concave-convex structure, and vertical slots are provided on both sides, which are clearance-fitted with the hexagonal shaft.

[0016] Based on the above, the beneficial effects of the isolation cover are that it forms a creepage barrier through the undulating surface, thereby achieving insulation protection of the cam sleeve; the beneficial effects of the vertical slot are that it is opened on both sides of the isolation cover and fits with the hexagonal shaft with clearance, so that the isolation cover can be snapped on without disassembling the hexagonal shaft, thereby simplifying the assembly process and achieving zero error in insulation distance.

[0017] Furthermore, the annular reinforcement group is composed of two adjacent annular reinforcements, and the distance between adjacent annular reinforcement groups is much greater than the width of the two adjacent annular reinforcements.

[0018] Based on the above, the beneficial effects of the ring reinforcement group are that the single-unit insulation barrier is formed by two adjacent ring reinforcements, and the dense reinforcement increases the local creepage distance, thereby strengthening the insulation performance of the upper crossbeam foundation; the beneficial effect of the large spacing of the ring reinforcement group is that it forms a large-span insulation channel on the upper crossbeam, making the busbar overlap of the L-shaped conductor completely exposed, thereby maximizing the busbar overlap area and increasing the current carrying capacity.

[0019] Furthermore, the metal cap component includes a metal cap and a stationary contact on the vacuum bulb. The metal cap is disposed at the upper opening of the vacuum bulb fixing shell. The lower end of the stationary contact on the vacuum bulb is located at the lower end of the metal cap and is in contact with the vacuum bulb. The upper end of the stationary contact on the vacuum bulb passes through the metal cap.

[0020] Based on the above, the beneficial effects of the metal cap are that it is fixed at the upper opening of the vacuum bubble fixing shell, directly covers the metal connection part of the stationary contact on the vacuum bubble and fits it tightly, and replaces the original epoxy board sealing with metal equipotential connection, thereby realizing the elimination of suspended charged bodies and optimization of electric field distribution; the beneficial effects of the stationary contact on the vacuum bubble are that the lower end is limited to the bottom of the metal cap and is connected to the vacuum bubble, and the upper end penetrates through the metal cap to form a connection part. By constraining its radial displacement through the metal cap, the mechanical stability of the current-carrying channel and zero potential difference connection are realized.

[0021] Furthermore, a grounding fixing plate is mounted on the rear side of the first mounting plate and the second mounting plate, and a grounding contact is provided on the grounding fixing plate corresponding to each of the isolating knife switches.

[0022] Based on the above, the beneficial effects of the grounding fixing plate are that it provides a stable mounting base for the grounding contact, realizing physical isolation and mechanical support between the grounding circuit and the main circuit frame; the beneficial effect of the grounding contact is that when the isolating switch is rotated to the rear side, it forms an electrical connection with its closing part, realizing a safe grounding path for the load circuit.

[0023] Furthermore, when the isolating moving switch rotates around the double-break epoxy rod to between the isolation assembly and the vacuum bulb assembly, the two closing parts of the isolating moving switch respectively engage with the stationary contact on the disconnector and the stationary contact on the vacuum bulb to form a closed state; when the isolating moving switch rotates around the double-break epoxy rod to between the vacuum bulb assembly and the grounding fixing plate, the two closing parts of the isolating moving switch respectively engage with the stationary contact on the vacuum bulb and the grounding contact to form a grounded state; when the isolating moving switch rotates around the double-break epoxy rod to between the grounding fixing plate and the isolation assembly, the two closing parts of the isolating moving switch respectively engage with the grounding contact and the stationary contact on the disconnector to form an open state.

[0024] Based on the above, the beneficial effect of the closed state is that when the two closing parts of the isolating switch are respectively engaged with the stationary contact on the isolating switch and the stationary contact on the vacuum bulb, a main current path is formed from the busbar through the L-shaped conductor 22, through the stationary contact on the isolating switch, the isolating switch, and the stationary contact on the vacuum bulb to the vacuum bulb, thus realizing the reliable connection of the main circuit of the circuit breaker and ensuring the normal power supply to the load; the beneficial effect of the grounding state is that when the two closing parts of the isolating switch are respectively engaged with the stationary contact on the vacuum bulb and the grounding contact, a main current path is formed from the stationary contact on the vacuum bulb through the L-shaped conductor 22, through the stationary contact on the isolating switch, the isolating switch, and the stationary contact on the vacuum bulb to the vacuum bulb, thus realizing the reliable connection of the main circuit of the circuit breaker and ensuring the normal power supply to the load; The grounding path from the isolating switch to the grounding contact enables the safe discharge of the vacuum bubble side (i.e., the load side) to ground potential, providing a safety guarantee for equipment maintenance or fault handling. The beneficial effect of the open state is that when the two closing parts of the isolating switch are respectively engaged with the grounding contact and the stationary contact on the disconnector, on the one hand, the main current path is disconnected, and on the other hand, a grounding path is formed from the stationary contact on the disconnector through the isolating switch to the grounding contact, realizing the safe discharge of the bus side to ground potential and providing double safety isolation in the circuit breaker open position.

[0025] To more clearly illustrate the above-mentioned features of this utility model and the objectives it aims to achieve, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0026] Fig. 1 : This is a schematic diagram of the present invention; Fig. 2 : This is a schematic diagram of the vacuum bubble assembly of this utility model.

[0027] Explanation of reference numerals: 1-Mounting frame, 11-First mounting plate, 12-Second mounting plate, 2-Isolation assembly, 21-Isolation upper crossbeam, 211-Annular rib assembly, 22-L-shaped conductor, 221-Busbar overlap, 222-Isolation switch upper stationary contact, 3-Moving knife switch assembly, 31-Double-break epoxy rod, 32-Isolation moving knife switch structure, 321-Moving knife limit sleeve, 322-Isolation moving knife switch, 33-Hexagonal fixing sleeve, 34-Moving knife limit cover 4-Vacuum bubble assembly, 41-Environmentally friendly vacuum seat, 411-Vacuum bubble fixing shell, 412-Isolation cover, 4121-Vertical slot, 413-Vacuum bracket protective shell, 42-Vacuum bubble, 421-Vacuum bracket, 4211-Cam sleeve, 43-Metal cover component, 431-Metal cover, 432-Vacuum bubble upper stationary contact, 44-Flexible connecting piece, 45-Wire cap, 5-Hexagonal shaft, 6-Grounding fixing plate, 61-Grounding contact. Detailed Implementation

[0028] like Figs. 1-2As shown, a double-break top-disconnecting circuit breaker includes a mounting frame 1. Within the mounting frame 1, from top to bottom, an isolation assembly 2, a moving knife switch assembly 3, and a vacuum bulb assembly 4 are sequentially arranged. The isolation assembly 2 includes an upper isolation beam 21 and three L-shaped conductors 22. Four annular rib groups 211 are spaced apart on the upper isolation beam 21. Each L-shaped conductor 22 is inserted between two annular rib groups 211. The horizontal section of the L-shaped conductor 22 forms a large-area busbar overlap 221, and the vertical section penetrates the upper isolation beam 21 and is exposed to form the upper stationary contact 222 of the disconnecting switch. The vacuum bubble assembly 4 includes an environmentally friendly vacuum seat 41 with three vacuum bubble fixing shells 411 integrally formed at the upper end, a vacuum bubble 42 disposed in each of the vacuum bubble fixing shells 411, and a metal cap component 43 disposed at the upper opening of the vacuum bubble fixing shell 411. The lower end of the vacuum bubble 42 is connected to a vacuum bracket 421. The bottom end of the environmentally friendly vacuum seat 41 is fitted with an isolation cover 412 corresponding to each of the vacuum brackets 421. A flexible connecting piece 44 is provided between the vacuum bubble 42 and the vacuum bracket 421. A wire cap 45 is provided at the end of the flexible connecting piece 44.

[0029] The mounting frame 1 includes a first mounting plate 11 and a second mounting plate 12 arranged in parallel. The lower end of the second mounting plate 12 extends longer than the first mounting plate 11. The movable knife switch assembly 3 includes a double-break epoxy rod 31 connecting the first mounting plate 11 and the second mounting plate 12, three isolation movable knife switch structures 32 sleeved on the double-break epoxy rod 31, a hexagonal fixing sleeve 33 that limits the three isolation movable knife switch structures 32 to approach the first mounting plate 11, and a movable knife limit cover 34 that limits the three isolation movable knife switch structures 32 to approach the second mounting plate 12. Each isolation movable knife switch structure 32 corresponds one-to-one with the position of the stationary contact 222 on the disconnect switch.

[0030] The isolating moving knife gate structure 32 includes a moving knife limiting sleeve 321 sleeved on the double-break epoxy rod 31 and an isolating moving knife gate 322 connected to the moving knife limiting sleeve 321. The isolating moving knife gate 322 has two closing parts located at both ends.

[0031] The lower end of the environmentally friendly vacuum seat 41 is integrally formed with three vacuum support protective shells 413, each vacuum support protective shell 413 covering the corresponding vacuum support 421, and the isolation cover 412 is snapped onto the bottom of the vacuum support protective shell 413.

[0032] The lower end of the vacuum bracket 421 is provided with a cam sleeve part 4211, and the lower end of the second mounting plate 12 is provided with a hexagonal shaft 5. The other end of the hexagonal shaft 5 passes through the three cam sleeve parts 4211 in sequence.

[0033] The isolation cover 412 is a protective cover with a concave-convex structure, and vertical slots 4121 are provided on both sides. The vertical slots 4121 are clearance-fitted with the hexagonal shaft 5.

[0034] The annular rib group 211 is composed of two adjacent annular ribs, and the distance between adjacent annular rib groups 211 is much greater than the width of the two adjacent annular ribs.

[0035] The metal cap component 43 includes a metal cap 431 and a stationary contact 432 on the vacuum bulb. The metal cap 431 is disposed at the upper opening of the vacuum bulb fixing shell 411. The lower end of the stationary contact 432 on the vacuum bulb is located at the lower end of the metal cap 431 and is in contact with the vacuum bulb 42. The upper end of the stationary contact 432 on the vacuum bulb passes through the metal cap 431.

[0036] A grounding fixing plate 6 is mounted on the rear side of the first mounting plate 11 and the second mounting plate 12, and a grounding contact 61 is provided on the grounding fixing plate 6 corresponding to each of the isolating knife switch 322.

[0037] When the isolating moving switch 322 rotates around the double-break epoxy rod 31 between the isolating component 2 and the vacuum bulb component 4, the two closing parts of the isolating moving switch 322 respectively engage with the stationary contact 222 on the isolating switch and the stationary contact 432 on the vacuum bulb to form a closed state; when the isolating moving switch 322 rotates around the double-break epoxy rod 31 between the vacuum bulb component 4 and the grounding fixing plate 6, the two closing parts of the isolating moving switch 322 respectively engage with the stationary contact 432 on the vacuum bulb and the grounding contact 61 to form a grounded state; when the isolating moving switch 322 rotates around the double-break epoxy rod 31 between the grounding fixing plate 6 and the isolating component 2, the two closing parts of the isolating moving switch 322 respectively engage with the grounding contact 61 and the stationary contact 222 on the isolating switch to form an open state.

[0038] In summary, the specific embodiments of this utility model are as follows: The circuit breaker is initially in the open state. At this time, the isolating moving switch 322 is located between the grounding fixed plate 6 and the isolating component 2. Its two closing parts are respectively engaged with the grounding contact 61 of the grounding fixed plate 6 and the stationary contact 222 of the isolating switch of the isolating component 2, forming a busbar-side grounding circuit. When it is necessary to connect the main circuit, the external operating mechanism drives the double-break epoxy rod 31 to rotate in a set direction, driving the three isolating moving switch structures 32 sleeved on the double-break epoxy rod 31 to rotate synchronously. The isolating moving switch 322 rotates around the double-break epoxy rod 31 to The position between the isolating component 2 and the vacuum bulb component 4 is such that the front closing part of the isolating moving knife switch 322 is engaged with the stationary contact 222 on the isolating switch, and the rear closing part is engaged with the stationary contact 432 on the vacuum bulb of the vacuum bulb component 4, forming a closed state. The current is conducted from the busbar overlap part 221 of the L-shaped conductor 22 to the stationary contact 222 on the isolating switch, and then transmitted through the isolating moving knife switch 322 to the stationary contact 432 on the vacuum bulb, and then flows into the vacuum bulb 42. Finally, it is output to the load circuit through the vacuum bracket 421, the flexible connecting piece 44, and the wire cap 45. When it is necessary to disconnect the main circuit and achieve load-side grounding, the operating mechanism continues to drive the double-break epoxy rod 31 to rotate in the same direction. The isolating moving knife switch 322 rotates to the position between the vacuum bulb assembly 4 and the grounding fixing plate 6. The front closing part of the isolating moving knife switch 322 disengages from the upper stationary contact 222 of the isolating switch and engages with the upper stationary contact 432 of the vacuum bulb. The rear closing part disengages from the upper stationary contact 432 of the vacuum bulb and engages with the grounding contact 61, forming a load-side grounding state. At this time, the potential on the side of the vacuum bulb 42 is safely discharged through the upper stationary contact 432 of the vacuum bulb, the isolating moving knife switch 322 and the grounding contact 61. When it is necessary to restore the tripped state, the operating mechanism continues to drive the double-break epoxy rod 31 to rotate in the original direction. The isolating moving knife switch 322 rotates to the space position between the grounding fixing plate 6 and the isolating component 2. The front closing part of the isolating moving knife switch 322 disengages from the stationary contact 432 on the vacuum bulb and engages with the grounding contact 61. The rear closing part disengages from the grounding contact 61 and engages with the stationary contact 222 on the disconnecting switch, thus rebuilding the grounding circuit on the bus side. Throughout the entire process, the hexagonal shaft 5 provides support by passing through the cam sleeve 4211 of the vacuum bracket 421. The isolation cover 412 maintains a clearance fit with the hexagonal shaft 5 through the vertical slot 4121 to achieve insulation protection for the vacuum bracket 421. The metal cover 431 always maintains the equipotential connection of the stationary contact 432 on the vacuum bulb. The large-spacing design of the annular rib group 211 ensures that the busbar overlap 221 of the L-shaped conductor 22 maintains the maximum exposed area.

[0039] The above description is only the optimal solution embodiment of this utility model and is not intended to limit this utility model. Various modifications or substitutions made by those skilled in the art to this utility model without departing from the essence and protection scope of this utility model should also be within the protection scope of this utility model.

Claims

1. A double-break top-disconnecting circuit breaker, comprising a mounting frame (1), wherein an isolation assembly (2), a moving switch assembly (3), and a vacuum bulb assembly (4) are arranged sequentially from top to bottom within the mounting frame (1), characterized in that: The isolation assembly (2) includes an upper isolation beam (21) and three L-shaped conductors (22). The upper isolation beam (21) is provided with four annular rib groups (211) spaced apart. Each L-shaped conductor (22) is inserted between two annular rib groups (211). The horizontal section of the L-shaped conductor (22) forms a large-area busbar overlap (221), and the vertical section penetrates the upper isolation beam (21) and is exposed to form the upper stationary contact (222) of the disconnect switch. The vacuum bulb assembly (4) includes an environmentally friendly vacuum with three vacuum bulb fixing shells (411) integrally formed at the upper end. The vacuum seat (41), the vacuum bulb (42) disposed in each of the vacuum bulb fixing shells (411), and the metal cap component (43) disposed at the upper opening of the vacuum bulb fixing shell (411) are provided. The lower end of the vacuum bulb (42) is connected to a vacuum bracket (421). The bottom end of the environmentally friendly vacuum seat (41) is fitted with an isolation cover (412) corresponding to each of the vacuum brackets (421). A flexible connecting piece (44) is provided between the vacuum bulb (42) and the vacuum bracket (421). A wire cap (45) is provided at the end of the flexible connecting piece (44).

2. The double-break on-site disconnect circuit breaker according to claim 1, characterized in that: The mounting frame (1) includes a first mounting plate (11) and a second mounting plate (12) arranged in parallel. The lower end of the second mounting plate (12) extends longer than the first mounting plate (11). The moving knife switch assembly (3) includes a double-break epoxy rod (31) connecting the first mounting plate (11) and the second mounting plate (12), three isolation moving knife switch structures (32) sleeved on the double-break epoxy rod (31), a hexagonal fixing sleeve (33) limiting the three isolation moving knife switch structures (32) to approach the first mounting plate (11), and a moving knife limit cover (34) limiting the three isolation moving knife switch structures (32) to approach the second mounting plate (12). Each isolation moving knife switch structure (32) corresponds one-to-one with the position of the stationary contact (222) on the disconnect switch.

3. A double-break on-site isolating circuit breaker according to claim 2, characterized in that: The isolating moving knife switch structure (32) includes a moving knife limiting sleeve (321) sleeved on the double-break epoxy rod (31) and an isolating moving knife switch (322) connected to the moving knife limiting sleeve (321). The isolating moving knife switch (322) has two closing parts located at both ends.

4. A double-break on-site disconnecting circuit breaker according to claim 1, characterized in that: The lower end of the environmentally friendly vacuum seat (41) is integrally formed with three vacuum support protective shells (413), each vacuum support protective shell (413) covering the corresponding vacuum support (421), and the isolation cover (412) is snapped onto the bottom of the vacuum support protective shell (413).

5. A double-break on-site isolating circuit breaker according to claim 2, characterized in that: The lower end of the vacuum bracket (421) is provided with a cam sleeve (4211), and the lower end of the second mounting plate (12) is provided with a hexagonal shaft (5). The other end of the hexagonal shaft (5) passes through the three cam sleeves (4211) in sequence.

6. A double-break on-site isolating circuit breaker according to claim 5, characterized in that: The isolation cover (412) is a protective cover with a concave-convex structure, and vertical slots (4121) are provided on both sides. The vertical slots (4121) are in clearance fit with the hexagonal shaft (5).

7. A double-break on-site disconnecting circuit breaker according to claim 1, characterized in that: The annular rib group (211) is composed of two adjacent annular ribs, and the distance between adjacent annular rib groups (211) is much greater than the width of the two adjacent annular ribs.

8. A double-break on-site isolating circuit breaker according to claim 3, characterized in that: The metal cap component (43) includes a metal cap (431) and a stationary contact (432) on the vacuum bulb. The metal cap (431) is disposed at the upper opening of the vacuum bulb fixing shell (411). The lower end of the stationary contact (432) on the vacuum bulb is located at the lower end of the metal cap (431) and is in contact with the vacuum bulb (42). The upper end of the stationary contact (432) on the vacuum bulb passes through the metal cap (431).

9. A double-break on-site disconnecting circuit breaker according to claim 8, characterized in that: A grounding fixing plate (6) is mounted on the rear side of the first mounting plate (11) and the second mounting plate (12), and a grounding contact (61) is provided on the grounding fixing plate (6) corresponding to each of the isolating knife switch (322).

10. A double-break on-site isolating circuit breaker according to claim 9, characterized in that: When the isolating moving switch (322) rotates around the double-break epoxy rod (31) between the isolating assembly (2) and the vacuum bulb assembly (4), the two closing parts of the isolating moving switch (322) respectively engage with the stationary contact (222) on the isolating switch and the stationary contact (432) on the vacuum bulb to form a closed state; when the isolating moving switch (322) rotates around the double-break epoxy rod (31) between the vacuum bulb assembly (4) and the grounding fixing plate (6), The two closing parts of the isolating moving knife switch (322) are respectively engaged on the stationary contact (432) on the vacuum bulb and the grounding contact (61) to form a grounded state; when the isolating moving knife switch (322) rotates around the double-break epoxy rod (31) to between the grounding fixing plate (6) and the isolation component (2), the two closing parts of the isolating moving knife switch (322) are respectively engaged on the grounding contact (61) and the stationary contact (222) on the isolating switch to form an open state.

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