CN220796632U - High-reliability miniature circuit breaker - Google Patents
High-reliability miniature circuit breaker Download PDFInfo
- Publication number
- CN220796632U CN220796632U CN202322575297.1U CN202322575297U CN220796632U CN 220796632 U CN220796632 U CN 220796632U CN 202322575297 U CN202322575297 U CN 202322575297U CN 220796632 U CN220796632 U CN 220796632U
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- arc
- shell
- fixed contact
- circuit breaker
- miniature circuit
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- 230000001965 increasing effect Effects 0.000 claims description 16
- 238000002955 isolation Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000004880 explosion Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 9
- 238000010891 electric arc Methods 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000008033 biological extinction Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Breakers (AREA)
Abstract
The utility model relates to a high-reliability miniature circuit breaker which comprises a shell, an operating mechanism, an electromagnetic release, a moving contact, a fixed contact, an arc extinguishing chamber, an arc striking plate, a first wiring terminal and a second wiring terminal, wherein the arc extinguishing chamber comprises an arc isolating plate and a plurality of arc extinguishing grid plates horizontally arranged in the arc isolating plate, a plurality of air outlet holes which are distributed in a staggered mode are respectively arranged on one side, far away from the fixed contact, of the arc isolating plate, an air exhaust cavity is arranged on the shell corresponding to the plurality of air outlet holes, a first air exhaust hole and a second air exhaust hole which are communicated with the air exhaust cavity are respectively arranged on the shell, and a baffle bump is arranged in the shell corresponding to the position between the moving contact and the arc striking plate. The utility model has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect and long service life.
Description
Technical Field
The utility model relates to the technical field of circuit breakers, in particular to a high-reliability miniature circuit breaker.
Background
The miniature circuit breaker is also called miniature circuit breaker, is suitable for overload and short-circuit protection of the line with rated voltage of 230/400V of alternating current 50/60Hz and rated current not exceeding 125A, and can be used as infrequent operation conversion of the line under normal conditions. The miniature circuit breaker is mainly used in various places such as industry, business, high-rise and civil houses. When the existing miniature circuit breaker is switched on and off, electric arcs are obliquely blown on the grid plates of the arc-extinguishing chamber, and the layout and design of the exhaust holes of the arc-extinguishing chamber are unreasonable, so that the arc-extinguishing chamber is not smooth in exhaust, the temperature of a contact part is increased, and the phenomena of contact fusion welding, arc reburning and the like are easy to occur. Therefore, the miniature circuit breaker has the defects of poor arc extinguishing effect, unreliable performance and short service life.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide the high-reliability miniature circuit breaker which has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect and long service life.
In order to achieve the purpose, the utility model adopts the high-reliability miniature circuit breaker which comprises a shell, an operating mechanism, an electromagnetic release, a moving contact, a fixed contact, an arc extinguishing chamber, an arc striking plate, a first wiring terminal and a second wiring terminal, wherein the arc extinguishing chamber comprises an arc isolating plate and a plurality of arc extinguishing grid plates horizontally arranged in the arc isolating plate, a plurality of air outlet holes which are distributed in a staggered manner are respectively arranged on one side, far away from the fixed contact, of the arc isolating plate, an air exhaust cavity is arranged on the shell corresponding to the plurality of air outlet holes, a first air exhaust hole and a second air exhaust hole which are communicated with the air exhaust cavity are respectively arranged on the shell, and a baffle bump is arranged between the corresponding moving contact and the arc striking plate in the shell.
The beneficial effects of the structure are as follows: the arc extinguishing grating sheet of the arc extinguishing chamber is horizontally arranged in the arc baffle plate, so that an arc is facilitated to enter the arc extinguishing chamber rapidly, the air outlet hole on the arc baffle plate can discharge the air pressure in the arc extinguishing chamber, and the shell is provided with the first air outlet hole and the second air outlet hole, so that the air pressure in the shell can be smoothly discharged, and the air discharge is smoother. The baffle lug is arranged in the shell, when the circuit breaker is switched on or off, the arc voltage between the moving contact and the fixed contact can be ensured to be increased, and the electric arc can enter into the arc extinguishing chamber rapidly, so that the quick extinction of the electric arc is facilitated, and the arc extinguishing effect is better. Therefore, the miniature circuit breaker has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect and long service life.
Specifically, one end of the fixed contact is connected to the magnetic yoke of the electromagnetic release, the other end of the fixed contact is provided with a bending part which is bent and extended towards the arc extinguishing chamber, a magnetic increasing sheet is arranged in the bending part, and one end of the magnetic increasing sheet extends into the arc extinguishing chamber. The fixed contact is provided with the magnetic increasing sheet, and the magnetic increasing sheet can accelerate the electric arc to enter the arc extinguishing chamber rapidly, thereby being beneficial to enhancing the arc extinguishing effect of the miniature circuit breaker.
Particularly, an arc striking part is arranged at the other end of the magnetic increasing sheet corresponding to the fixed contact of the fixed contact, and the width of the arc striking part is larger than that of the fixed contact. The arc striking part can rapidly introduce the arc at the static contact into the arc extinguishing chamber, thereby playing a role in protecting the static contact and being beneficial to improving the arc extinguishing performance of the miniature circuit breaker.
Particularly, an arc striking channel is formed between the fixed contact and the arc striking plate, the arc striking channel is communicated between the moving contact and the arc extinguishing chamber, arc isolating sheet assemblies are respectively arranged on two sides of the shell corresponding to the arc striking channel, and each arc isolating sheet assembly comprises an arc isolating sheet arranged in the shell and an iron sheet arranged between the corresponding arc isolating sheet and the shell. The iron sheet of the arc isolation sheet component can accelerate the electric arc to enter the arc extinguishing chamber quickly, and is favorable for quick extinction of the electric arc.
Particularly, a positioning column is arranged at two ends of the corresponding arc-isolating sheet in the shell, positioning holes matched with the positioning column are arranged at two ends of the arc-isolating sheet, and the positioning column is inserted in the positioning holes and is clamped and matched with the positioning column. The arc isolation sheet and the shell are connected in a clamping fit mode, so that the arc isolation sheet and the shell are convenient to assemble, and the assembly efficiency is higher.
Drawings
Fig. 1 is a perspective view of an embodiment of the present utility model.
Fig. 2 is an exploded view of an embodiment of the present utility model.
Fig. 3 is an internal structural diagram of an embodiment of the present utility model.
Fig. 4 is a perspective view of a protective cover plate according to an embodiment of the present utility model.
Detailed Description
As shown in fig. 1 to 4, the embodiment of the utility model is a high-reliability miniature circuit breaker, which comprises a shell 10, an operating mechanism 11, an electromagnetic release 12, a moving contact 13, a fixed contact 14, an arc extinguishing chamber 15, an arc striking plate 16, a first wiring terminal 17 and a second wiring terminal 18, wherein the arc extinguishing chamber 15 comprises an arc isolating plate 151 and a plurality of arc extinguishing grid plates 152 horizontally arranged in the arc isolating plate 151, a plurality of air outlet holes 153 which are distributed in a staggered manner are respectively arranged on one side, far away from the fixed contact 14, of the arc isolating plate 151, an air exhaust cavity 101 is arranged on the shell 10 corresponding to the plurality of air outlet holes 153, a first air exhaust hole 102 and a second air exhaust hole 103 which are communicated with the air exhaust cavity 101 are respectively arranged on the shell 10, and a barrier lug 104 is arranged between the corresponding moving contact 13 and the arc striking plate 16 in the shell 10. One end of the fixed contact 14 is connected to the magnetic yoke 121 of the electromagnetic release 12, the other end of the fixed contact 14 is provided with a bending part 141 which is bent and extended towards the arc extinguishing chamber 15, the bending part 141 is internally provided with a magnetic increasing sheet 17, and one end of the magnetic increasing sheet extends into the arc extinguishing chamber. The fixed contact is provided with the magnetic increasing sheet, and the magnetic increasing sheet can accelerate the electric arc to enter the arc extinguishing chamber rapidly, thereby being beneficial to enhancing the arc extinguishing effect of the miniature circuit breaker. The other end of the magnetic increasing sheet 17 is provided with an arc striking part 171 corresponding to the fixed contact 142 of the fixed contact 14, and the width of the arc striking part 171 is larger than that of the fixed contact 14. The arc striking part can rapidly introduce the arc at the static contact into the arc extinguishing chamber, thereby playing a role in protecting the static contact and being beneficial to improving the arc extinguishing performance of the miniature circuit breaker. An arc striking channel 105 is formed between the fixed contact 14 and the arc striking plate 16, the arc striking channel 105 is communicated between the moving contact 13 and the arc extinguishing chamber 15, two sides of the shell 10 corresponding to the arc striking channel 105 are respectively provided with an arc isolating sheet component 20, and the arc isolating sheet component 20 comprises an arc isolating sheet 21 arranged in the shell 10 and an iron sheet 22 arranged between the arc isolating sheet 21 and the shell 10. The iron sheet of the arc isolation sheet component can accelerate the electric arc to enter the arc extinguishing chamber quickly, and is favorable for quick extinction of the electric arc. The two ends of the shell 10 corresponding to the arc isolation sheets 21 are respectively provided with a positioning column 106, the two ends of the arc isolation sheets 21 are respectively provided with positioning holes 211 matched with the positioning columns 106, and the positioning columns 106 are inserted into the positioning holes 211 to form clamping fit between the arc isolation sheets 21 and the positioning columns 106. The arc isolation sheet and the shell are connected in a clamping fit mode, so that the arc isolation sheet and the shell are convenient to assemble, and the assembly efficiency is higher.
The arc extinguishing grating sheet of the arc extinguishing chamber is horizontally arranged in the arc baffle plate, so that an arc is facilitated to enter the arc extinguishing chamber rapidly, the air outlet hole on the arc baffle plate can discharge the air pressure in the arc extinguishing chamber, and the shell is provided with the first air outlet hole and the second air outlet hole, so that the air pressure in the shell can be smoothly discharged, and the air discharge is smoother. The baffle lug is arranged in the shell, when the circuit breaker is switched on or off, the arc voltage between the moving contact and the fixed contact can be ensured to be increased, and the electric arc can enter into the arc extinguishing chamber rapidly, so that the quick extinction of the electric arc is facilitated, and the arc extinguishing effect is better. Therefore, the miniature circuit breaker has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect and long service life.
Claims (5)
1. The utility model provides a high reliable miniature circuit breaker, includes casing, operating device, electromagnetic release, moving contact, stationary contact, explosion chamber, striking board, first binding post, second binding post, its characterized in that: the arc extinguishing chamber comprises an arc isolation plate and a plurality of arc extinguishing grid plates horizontally arranged in the arc isolation plate, wherein a plurality of air outlet holes which are distributed in a staggered mode are respectively arranged on one side, far away from the fixed contact, of the arc isolation plate, an air exhaust cavity is arranged at the position, corresponding to the plurality of air outlet holes, of the shell, a first air exhaust hole and a second air exhaust hole which are communicated with the air exhaust cavity are respectively arranged on the shell, and a baffle protruding block is arranged at the position, corresponding to the position between the movable contact and the arc ignition plate, of the shell.
2. The high reliability miniature circuit breaker of claim 1, wherein: the fixed contact one end connect on the yoke of electromagnetic release, the fixed contact other end have to the explosion chamber bend the portion of bending that extends, the portion of bending in be provided with the magnetic increasing piece, magnetic increasing piece one end extend in the explosion chamber.
3. The high reliability miniature circuit breaker of claim 2, wherein: and an arc striking part is arranged at the other end of the magnetic increasing sheet corresponding to the fixed contact of the fixed contact, and the width of the arc striking part is larger than that of the fixed contact.
4. The high reliability miniature circuit breaker according to claim 1 or 2, characterized in that: the fixed contact and the arc striking plate are provided with an arc striking channel, the arc striking channel is communicated between the moving contact and the arc extinguishing chamber, two sides of the shell corresponding to the arc striking channel are respectively provided with an arc isolating sheet component, and the arc isolating sheet component comprises an arc isolating sheet arranged in the shell and an iron sheet arranged between the arc isolating sheet and the shell.
5. A high reliability miniature circuit breaker according to claim 3, characterized in that: the shell in correspond and separate arc piece both ends department and be provided with a reference column respectively, separate arc piece both ends on be provided with respectively with reference column matched with locating hole, the reference column alternate in the locating hole, and constitute the joint cooperation that separates arc piece and reference column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322575297.1U CN220796632U (en) | 2023-09-21 | 2023-09-21 | High-reliability miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322575297.1U CN220796632U (en) | 2023-09-21 | 2023-09-21 | High-reliability miniature circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220796632U true CN220796632U (en) | 2024-04-16 |
Family
ID=90658160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322575297.1U Active CN220796632U (en) | 2023-09-21 | 2023-09-21 | High-reliability miniature circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220796632U (en) |
-
2023
- 2023-09-21 CN CN202322575297.1U patent/CN220796632U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |