Interphase insulation structure of circuit breaker

Abstract

The utility model relates to an interphase insulation structure of a circuit breaker, which is connected with a circuit breaker body and comprises a cover shell and a bottom plate which are buckled with each other, a plurality of insulation partition plates are arranged on the cover shell in parallel, and the plurality of insulation partition plates divide the lower side space of the cover shell into a plurality of arc running channels. Each arc running channel is communicated with an outlet of an arc extinguish chamber of a corresponding phase in the circuit breaker body; a plurality of grid sheets are arranged on the lower side of the housing at intervals along the length direction of the channel; the front end of the circuit breaker body vertically extends to butt joint grooves between the arc extinguish chamber outlets of all phases, the cross section of each butt joint groove is in an E shape, a set of butt joint ribs are arranged on the front side of the insulating partition plate at intervals, and the butt joint ribs can be embedded in the corresponding butt joint grooves so as to be in butt joint with the arc running channel and the arc extinguish chamber outlets. Compared with the prior art, the plurality of mutually embedded rib groove structures between two phases effectively increase the inter-phase creepage distance, improve the insulating strength, and reliably meet the arc extinguishing requirement of high-voltage large-current breaking.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to an interphase insulation structure of a circuit breaker. Background Art

[0002] Molded case circuit breaker is a protective electrical appliance. When the molded case circuit breaker is overloaded or short-circuited, the molded case circuit breaker trips to cut off the fault current. When the fault current is large, the circuit breaker breaks the large current, and a large number of arcs are generated. Under the strong air blowing pressure, the arc will quickly spread around and spray out of the circuit breaker body through the arc extinguishing chamber. If the external phase-to-phase insulation of the molded case circuit breaker is insufficient, it is easy to cause phase-to-phase breakdown, resulting in breaking failure.

[0003] Existing circuit breaker external phase-to-phase insulation solutions are mostly simple single slot plus clamping structure, which has pain points such as insufficient insulation range and insufficient insulation strength when facing high voltage disconnection. Summary of the invention

[0004] The purpose of the utility model is to provide a phase-to-phase insulation structure of a circuit breaker which has stronger insulation capacity, wider insulation range, effectively copes with arc spraying during high voltage and large current interruption, and has good insulation effect.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] An interphase insulation structure of a circuit breaker is connected to a circuit breaker body, comprising a cover shell and a bottom plate that are interlocked with each other, a plurality of insulating partitions are arranged in parallel on the cover shell, and the plurality of insulating partitions divide the space under the cover shell into a plurality of arc running channels, each arc running channel is connected to an arc extinguishing chamber outlet of a corresponding phase in the circuit breaker body;

[0007] A plurality of grid sheets are arranged at intervals along the length direction of the channel on the lower side of the cover;

[0008] The upper end of the cover extends forward and covers the front end of the circuit breaker body, and the lower end of the bottom plate extends forward and is placed under the front end of the circuit breaker body;

[0009] The front end of the circuit breaker body is provided with a butt joint groove extending vertically between the outlets of the arc extinguishing chambers of each phase. The cross section of the butt joint groove is in a mountain shape. A group of butt joint ribs are arranged at intervals on the front side of the insulating partition. The butt joint ribs can be embedded in the corresponding butt joint groove to butt the arc running channel with the outlet of the arc extinguishing chamber.

[0010] Furthermore, a plurality of mounting grooves are arranged in parallel on the bottom plate, and the lower edges of the insulating partitions are embedded in the mounting grooves.

[0011] Furthermore, a U-shaped groove opening backwards is provided on the rear side of the insulating partition, a clamping groove is provided on the mounting groove, and the lower end of the U-shaped groove is embedded in the clamping groove.

[0012] Furthermore, a transverse boss is provided between the mounting grooves, and a front edge of the transverse boss abuts against the front end of the circuit breaker body.

[0013] Furthermore, the insulating partition is provided with a bolt hole, and the mounting groove is provided with a bolt seat with a through hole;

[0014] The lower end of the bolt hole is embedded in the bolt seat and connected with the bolt hole through the bolt A penetrating through the through hole.

[0015] Furthermore, the circuit breaker body includes a cover and a base connected to each other up and down, a cover front groove is provided at the front end of the cover, and a base front groove is provided at the front end of the base. The cross-sections of the cover front groove and the base front groove are in a mountain shape and are interconnected to form the connecting groove.

[0016] Furthermore, a gap is provided between the lower edge of the grid plate and the bottom plate.

[0017] Furthermore, a plurality of through holes are formed on the grid plate.

[0018] Furthermore, a bolt hole is provided on the front extension portion at the lower end of the base plate, and is connected to the lower front end of the circuit breaker body by means of a screw B passing through the bolt hole.

[0019] Furthermore, a U-shaped positioning platform is provided on the bottom side of the upper front extension of the cover shell, a U-shaped groove is provided at the front end of the circuit breaker body, and the upper end of the cover shell and the front end of the circuit breaker body are limited by the U-shaped positioning platform and the U-shaped groove.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1) In the present invention, under the same circuit breaker body size, multiple mutually embedded rib-groove structures between two phases effectively increase the inter-phase creepage distance, improve the insulation strength, and reliably meet the arc extinguishing requirements of high voltage and high current interruption.

[0022] 2) The bottom plate of the utility model extends to the bottom of the base. When installing, screws are passed through the circuit breaker body and the bottom plate, and they are installed together on the bracket, which is more firm and reliable and can adapt to any form of mounting bracket and cabinet.

[0023] 3) The bottom plate of the utility model is provided with a transverse boss which is in close contact with the front end of the base, which is beneficial to preventing the arc from penetrating downward and rearward. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an interphase insulation structure of a circuit breaker in the utility model;

[0025] Figure 2 for Figure 1Middle AA section view;

[0026] Figure 3 for Figure 1 Middle BB section view;

[0027] Figure 4 is a schematic diagram of the structure of the cover;

[0028] Figure 5 is a schematic diagram of the structure of the base;

[0029] Figure 6 is a schematic diagram of the structure of the cover;

[0030] Figure 7 is a schematic diagram of the structure of the base plate;

[0031] Description of the markings in the figure:

[0032] 1-circuit breaker body, 11-base, 111-front groove of base, 12-cover, 121-front groove of cover, 122-front part of cover; 2-cover, 21-butt rib, 22-front end of cover, 23-grid; 3-bottom plate, 31-lateral boss, 32-bottom plate hole; 41-screw A, 42-screw B; 5-fixing bracket; 6-insulating partition. DETAILED DESCRIPTION

[0033] The following embodiments are implemented based on the above technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following embodiments.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Example

[0036] A phase-to-phase insulation structure of a circuit breaker is connected to a circuit breaker body 1, and comprises a cover shell 2 and a bottom plate 3 which are interlocked with each other. A plurality of insulating partitions 6 are arranged in parallel on the cover shell 2, and the plurality of insulating partitions 6 divide the space below the cover shell 2 into a plurality of arc running channels, and each arc running channel is connected to the outlet of the arc extinguishing chamber of the corresponding phase in the circuit breaker body 1; a plurality of grids 23 are arranged at intervals on the lower side of the cover shell 2 along the length direction of the channel; the upper end of the cover shell 2 extends forward and covers the front end of the circuit breaker body 1, and the lower end of the bottom plate 3 extends forward and is cushioned under the front end of the circuit breaker body 1; a butt joint groove is provided at the front end of the circuit breaker body 1 and vertically extends between the outlets of the arc extinguishing chambers of each phase, and the cross section of the butt joint groove is in the shape of a mountain, and a group of butt joint ribs 21 are arranged at intervals on the front side of the insulating partition 6, and the butt joint ribs 21 can be embedded in the corresponding butt joint groove to butt the arc running channel with the outlet of the arc extinguishing chamber.

[0037] In this embodiment, a plurality of mounting grooves are arranged in parallel on the bottom plate 3 , and the lower edges of the insulating partitions 6 are embedded in the mounting grooves.

[0038] In this embodiment, a U-shaped groove opening backwards is provided at the rear side of the insulating partition 6, and a clamping groove is provided on the mounting groove, and the lower end of the U-shaped groove is embedded in the clamping groove.

[0039] In this embodiment, a transverse boss 31 is provided between the mounting grooves, and the front edge of the transverse boss 31 abuts against the front end of the circuit breaker body 1 .

[0040] In this embodiment, the insulating partition 6 is provided with bolt holes, and the mounting groove is provided with a bolt seat with a through hole;

[0041] In this embodiment, the lower end of the bolt hole is embedded in the bolt seat and connected with the bolt hole through the bolt A41 penetrating through the through hole.

[0042] In this embodiment, the circuit breaker body 1 includes a cover 12 and a base 11 that are connected to each other up and down. A cover front groove 121 is provided at the front end of the cover 12, and a base front groove 111 is provided at the front end of the base 11. The cross-sections of the cover front groove 121 and the base front groove 111 are in a mountain shape and are connected to each other to form the connecting groove.

[0043] In this embodiment, a gap is provided between the lower edge of the grid plate 23 and the bottom plate 3 .

[0044] In this embodiment, a plurality of through holes are formed on the grid plate 23 .

[0045] In this embodiment, a bolt hole is provided on the front extending portion of the lower end of the base plate 3 , and is connected to the lower front end of the circuit breaker body 1 by means of a screw B42 passing through the bolt hole.

[0046] In this embodiment, a U-shaped positioning platform is provided on the bottom side of the upper front extension of the cover shell 2, a U-shaped groove is provided at the front end of the circuit breaker body 1, and the upper end of the cover shell 2 and the front end of the circuit breaker body 1 are limited by the U-shaped positioning platform and the U-shaped groove.

[0047] like Figure 1 As shown, a phase-to-phase insulation structure of a circuit breaker has the main function of increasing the creepage distance by utilizing multiple rib-groove interlocking structures, improving the external insulation strength of the circuit breaker body, and helping it to achieve high current limit breaking.

[0048] This embodiment is implemented in the following form: the cover 2 is installed along the base front groove 111 and the cover front groove 121 of the cover 12 and the base 11 until they are closely aligned with them, and the butt ribs 21 on the cover are embedded with the corresponding characteristic grooves on the cover 12 and the base 11. When the arc sprays out of the circuit breaker body, the multi-slot structure between the phases of the circuit breaker body 1 greatly increases the phase-to-phase creepage distance, and the phase-to-phase insulation strength is effectively improved, which can avoid phase-to-phase breakdown and ultimately help the circuit breaker to achieve reliable arc extinguishing. At the upper part of the circuit breaker, the front end 22 of the cover and the front part 122 of the cover fit together, which can also effectively prevent the arc from spraying upwards and prevent the arc from breaking through in the upper area; at the lower part of the circuit breaker, the bottom plate 3 is closely attached to the cover 2 and the base 11 to prevent the arc from running downwards and causing breakdown, and at the same time, it can also prevent the arc from directly running to the fixed bracket where the circuit breaker body is installed and causing breakdown.

[0049] Working principle:

[0050] like Figure 1 , Figure 2 As shown, screw B 42 passes through the circuit breaker body 1 and the bottom plate hole 32, and screw A 41 passes through the cover 2 and the bottom plate 3, fixing them together and installing them on the fixing bracket 5. The bottom plate 3 is placed at the bottom of the circuit breaker body 1 and the cover 2, and has a transverse boss 31 thereon. This feature is close to the lower front end of the base 11, which can better prevent the arc from running downward, preventing phase breakdown or breakdown of the fixing bracket 5.

[0051] like Figure 1 , Figure 3 As shown, the upper front end 22 of the cover is in close contact with the upper front part 122 of the cover, forming a closed space around it. When the arc is ejected from the circuit breaker body 1, it can be prevented from rushing upward, preventing the phase-to-phase breakdown in the upper area of ​​the circuit breaker body, and also preventing the side phase arc from splashing, thereby preventing the possible breakdown of other equipment or cabinets.

[0052] like Figure 2 , Figure 3As shown, there are multiple spaced butt joint ribs 21 on the wall between the two phases of the housing 2, multiple spaced butt joint grooves 111 on the wall between the two phases of the base 11; there are multiple spaced butt joint grooves 121 on the wall between the two phases of the cover, and the butt joint ribs 21 are inserted into the cover front grooves 121 and the base front grooves 111 along a certain direction. The multiple mutually embedded rib-groove structures effectively increase the inter-phase creepage distance, improve the inter-phase insulation strength, and avoid inter-phase breakdown after the arc is ejected. At this time, the arc can only move forward and is cooled and absorbed by the grid 23 in the housing 2, which ultimately helps the circuit breaker to achieve reliable disconnection. A single rib-groove structure is also provided on both sides of the circuit breaker, which can also play a role in improving the insulation strength.

[0053] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A phase-to-phase insulation structure of a circuit breaker, connected to a circuit breaker body (1), characterized in that: It comprises a cover shell (2) and a bottom plate (3) which are interlocked with each other, wherein a plurality of insulating partitions (6) are arranged in parallel on the cover shell (2), and the plurality of insulating partitions (6) divide the space below the cover shell (2) into a plurality of arc running channels, each arc running channel being connected to an outlet of an arc extinguishing chamber of a corresponding phase in a circuit breaker body (1); A plurality of grid sheets (23) are arranged at intervals along the length direction of the channel on the lower side of the cover shell (2); The upper end of the cover shell (2) extends forward and covers the front end of the circuit breaker body (1), and the lower end of the base plate (3) extends forward and is cushioned under the front end of the circuit breaker body (1); A butt joint groove is provided at the front end of the circuit breaker body (1) and vertically extends between the outlets of the arc extinguishing chambers of each phase, the cross section of the butt joint groove is in the shape of a mountain, and a group of butt joint ribs (21) are arranged at intervals on the front side of the insulating partition plate (6), and the butt joint ribs (21) can be embedded in the corresponding butt joint groove to butt the arc running channel with the outlet of the arc extinguishing chamber.

2. The phase-to-phase insulation structure of the circuit breaker according to claim 1, characterized in that: The bottom plate (3) is provided with a plurality of mounting grooves in parallel, and the lower edges of the insulating partitions (6) are embedded in the mounting grooves.

3. The phase-to-phase insulation structure of the circuit breaker according to claim 2, characterized in that: The insulating partition (6) is provided with a U-shaped groove opening backwards on the rear side, the mounting groove is provided with a clamping groove, and the lower end of the U-shaped groove is embedded in the clamping groove.

4. The phase-to-phase insulation structure of the circuit breaker according to claim 2, characterized in that: A transverse boss (31) is provided between the installation grooves, and a front edge of the transverse boss (31) abuts against a front end of the circuit breaker body (1).

5. The phase-to-phase insulation structure of the circuit breaker according to claim 2, characterized in that: The insulating partition (6) is provided with a bolt hole, and the mounting groove is provided with a bolt seat having a through hole; The lower end of the bolt hole is embedded in the bolt seat and connected by a bolt A (41) passing through the through hole and the bolt hole.

6. The phase-to-phase insulation structure of the circuit breaker according to claim 1, characterized in that: The circuit breaker body (1) comprises a cover (12) and a base (11) butted against each other from top to bottom, the front end of the cover (12) being provided with a cover front groove (121), the front end of the base (11) being provided with a base front groove (111), the cross sections of the cover front groove (121) and the base front groove (111) being in a mountain shape, and being interconnected to form the butt joint groove.

7. The phase-to-phase insulation structure of a circuit breaker according to claim 1, characterized in that: A gap is provided between the lower edge of the grid plate (23) and the bottom plate (3).

8. The phase-to-phase insulation structure of a circuit breaker according to claim 1, characterized in that: The grid plate (23) is provided with a plurality of through holes.

9. The phase-to-phase insulation structure of a circuit breaker according to claim 1, characterized in that: A bolt hole is provided on the front extension portion at the lower end of the base plate (3), and is connected to the lower front end of the circuit breaker body (1) via a screw B (42) inserted through the bolt hole.

10. The phase-to-phase insulation structure of a circuit breaker according to claim 1, characterized in that: A U-shaped positioning platform is provided at the bottom side of the upper front extension of the cover shell (2), a U-shaped groove is provided at the front end of the circuit breaker body (1), and the upper end of the cover shell (2) and the front end of the circuit breaker body (1) are limited by the U-shaped positioning platform and the U-shaped groove.

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