CN220272408U - Plastic shell type circuit breaker with high-capacity arc extinguishing chamber - Google Patents
Plastic shell type circuit breaker with high-capacity arc extinguishing chamber Download PDFInfo
- Publication number
- CN220272408U CN220272408U CN202321771922.3U CN202321771922U CN220272408U CN 220272408 U CN220272408 U CN 220272408U CN 202321771922 U CN202321771922 U CN 202321771922U CN 220272408 U CN220272408 U CN 220272408U
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- China
- Prior art keywords
- arc
- extinguishing chamber
- circuit breaker
- shell
- shell cover
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- 239000002184 metal Substances 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims description 21
- 238000009434 installation Methods 0.000 abstract description 8
- 238000010891 electric arc Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
A molded case circuit breaker with a large-capacity arc-extinguishing chamber comprises a circuit breaker body, a shell and a shell cover, wherein the cross section of the shell cover is high on the left and low on the right, the left part is not higher than the handle after the shell cover is combined with the shell, and the arc-extinguishing chamber is arranged below the left part; the arc extinguishing chamber is additionally provided with an arc striking sheet which is a special-shaped metal sheet, and the arc striking sheet starts from the right side of the shell cover above the arc extinguishing chamber and extends to the upper part of the moving contact along the right side wall of the shell cover, so that the shape of the arc striking sheet is attached to the shape of the inner wall of the shell cover. The design of the utility model breaks through the traditional appearance of the original breaker, improves the appearance design of the breaker on the premise of not changing the appearance and the installation size of the breaker, increases the installation space of an arc extinguishing chamber part, and achieves the purposes of increasing the capacity and improving the breaking capacity of direct current short circuit current. And can be used as an alternating current/direct current dual-purpose circuit breaker.
Description
Technical Field
The utility model relates to the technical field of emergency protection devices, in particular to a high-capacity arc-extinguishing chamber plastic shell circuit breaker.
Background
Circuit breakers play an important role in the event of overload and short circuits in distribution lines, and are of a wide variety, so that plastic-case circuit breakers are commonly used in industrial and domestic low-voltage distribution equipment as branch switches of low-voltage distribution systems. At the moment of rapid development of new energy sources such as photovoltaic power generation, the technical difficulty in the industry is still short-circuit fault protection of a direct-current circuit, in particular to a short-circuit current short flashover breaking technology of 1500V or below. Products improved in the industry are often complex in structure and high in cost, and the performance of switching short-circuit current flashover is only relatively improved.
When a short circuit happens in a power distribution system, a circuit breaker generates a plasma arc with large energy between a moving contact and a fixed contact when the short circuit current is broken, and the circuit breaker needs to extinguish the arc to finish the task of breaking the short circuit current. When the direct current short circuit current is disconnected, the disconnection short circuit current is more difficult than the alternating current because of no zero crossing point. The short circuit arc extinguishing performance of the circuit breaker generally depends on the capacity of the arc extinguishing chamber of the circuit breaker, the capacity of the arc extinguishing chamber is generally proportional to the volume and the number of arc extinguishing bars in the arc extinguishing chamber, the arc extinguishing performance of the large-capacity arc extinguishing chamber is higher, but the volume can be correspondingly increased, the plastic shell type circuit breaker is limited by the application range, and the volume of the large-capacity arc extinguishing chamber is sometimes unrealistic to be increased. Therefore, a new circuit breaker is needed that can still improve the arc extinguishing performance without changing the installation size of the original circuit breaker.
When the circuit breaker breaks short-circuit current, the cooperation of arc-stop plate and explosion chamber is unreasonable, and the electric arc has the risk of excessive overfall overlength, and residual electric arc can be spouted through the arc spraying window of circuit breaker upper end, and the spun electric arc has certain energy, and the shell can be burnt through to some extent to shell and other circuit elements when the phenomenon of excessive occurrence.
One patent with application number of CN202021935782.5 and name of 'circuit breaker with arc extinguishing structure' in Chinese patent database provides a solution, wherein the arc extinguishing structure is arranged at the front side of the top wall of the circuit breaker main body, the arc extinguishing structure comprises an arc extinguishing cover, a plurality of arc extinguishing grid sheets are arranged in the arc extinguishing cover, arc extinguishing openings are formed in the bottom wall of each arc extinguishing grid sheet, arc guide blocks are arranged at the positions, close to two sides, of the bottom wall of each arc extinguishing grid sheet, a plurality of arc striking sheets in an inverted triangle shape are welded on the bottom wall of each arc guide block, the bottom ends of the arc striking sheets extend to the inside of the circuit breaker main body, a protection plate is arranged at the front side of the circuit breaker main body, a bump is arranged on one side, close to the circuit breaker main body, of the protection plate, and a sealing ring is arranged on the outer wall of the bump. This patent has increased the arc extinguishing structure in the outside of circuit breaker body, has increased the requirement of circuit breaker to installation area, and just can only block the inside arc that produces of circuit breaker, therefore what is needed in industry is a plastic shell type circuit breaker that can increase the arc extinguishing capacity and do not increase original circuit breaker installation size and volume.
Disclosure of Invention
The utility model aims at overcoming the defects of the prior art and provides a high-capacity arc-extinguishing chamber molded case circuit breaker. On the premise of not changing the installation size of the circuit breaker, the shape and the structural design of the shell of the circuit breaker are improved, the space of an arc-extinguishing chamber part is enlarged, and the purposes of increasing the installation capacity of the arc-extinguishing chamber and improving the breaking capacity of direct current short-circuit current are achieved.
The utility model is realized by the following technical scheme:
a molded case circuit breaker with a high-capacity arc extinguish chamber comprises a circuit breaker body, a shell and a shell cover, wherein the cross section of the shell cover is high left and low right, the left part is not higher than the handle after the shell cover is combined with the shell, and the arc extinguish chamber is arranged below the left part; the arc extinguishing chamber is additionally provided with an arc striking sheet, the arc striking sheet is a special-shaped metal sheet, and the arc striking sheet starts from the right side of the shell cover above the arc extinguishing chamber and extends to the upper part of the moving contact along the right side wall of the shell cover, so that the shape of the arc striking sheet is attached to the shape of the inner wall of the shell cover.
The plastic shell type circuit breaker with the high-capacity arc extinguishing chamber is characterized in that the arc spraying window is additionally arranged above the left side of the arc extinguishing chamber, the cross section of the arc spraying window is in an inverted L shape, and the arc spraying window is in a multi-layer structure.
According to the plastic shell type circuit breaker with the high-capacity arc extinguishing chamber, the starting end on the left side of the arc striking sheet is overlapped with the arc spraying window.
The plastic shell type circuit breaker with the high-capacity arc extinguishing chamber is characterized in that the arc striking sheet is arranged in the shell.
Advantageous effects
The utility model changes the traditional shell of the original breaker, improves the shape design of the shell on the premise of not changing the installation size of the breaker, increases the space of an arc extinguishing chamber part, and achieves the purposes of increasing the capacity and improving the breaking capacity of direct current short circuit current. And an arc spraying window structure is additionally arranged in the circuit breaker, and the arc spraying windows in various different modes are combined, so that when a circuit has a short circuit fault and the circuit breaker breaks a short circuit current, arc energy can be effectively blocked, consumed and cooled, and the arcing distance can be limited.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
fig. 2 is a schematic view of the exterior of the circuit breaker cover of the present utility model;
fig. 3 is a schematic view of an arc spraying window.
The list of the reference numerals in the drawings is: 1. a housing; 2. a cover; 3. a stationary contact; 4. a moving contact; 5. an arc extinguishing chamber; 6. arc spraying window; 7. a handle; 11. an arc striking piece; 12. arc extinguishing grid plate.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the utility model comprises a breaker body, a shell 1 and a shell cover 2, wherein the cross section of the shell cover 2 is in a shape of being high on the left and low on the right, a cavity with high on the left and low on the right is formed after the shell 2 is combined with the shell 1, the height of the left part is not higher than that of a handle 7, and an arc extinguishing chamber 5 is arranged below the left part; the structure of the shell cover 2 increases the capacity of the arc-extinguishing chamber 5, the number of the arc-extinguishing grid plates 12 increases along with the increase of the capacity of the arc-extinguishing chamber 5, and the increase of the arc-extinguishing grid plates 12 directly increases the arc-extinguishing capacity of the arc-extinguishing chamber 5, so that the capacity of breaking short-circuit current, particularly direct-current short-circuit current, is improved.
The arc extinguishing chamber 5 is additionally provided with an arc striking sheet 11, the arc striking sheet 11 is a special-shaped metal sheet, and the arc striking sheet 11 starts from the right side of the shell cover 2 above the arc extinguishing chamber 5 and extends to the upper part of the moving contact 4 along the right side wall of the shell cover, so that the shape of the arc striking sheet 11 is attached to the shape of the inner wall of the shell cover 2.
Referring to fig. 1 and 3, an arc spraying window 6 is additionally arranged above the left side in the arc extinguishing chamber 5, the cross section of the arc spraying window 6 is in an inverted L shape, and the arc spraying window 6 is in a multi-layer structure. The arc spraying window 6 is formed by combining a plurality of layers of sheet-shaped and net-shaped arc spraying sheets and wire meshes. When the circuit has short-circuit fault and the circuit breaker breaks short-circuit current, the arc energy can be effectively blocked, consumed and cooled, and the arcing distance can be limited.
When the circuit breaker breaks short-circuit current, the electric arc between the movable contact and the fixed contact enters the arc extinguishing chamber 5 through the related technical means, the electric arc energy is greatly weakened after being firstly cooled and dissociated in the arc extinguishing chamber 5 through the segmentation of the arc extinguishing grid plates 12, and then is sprayed outwards through the arc spraying window 6 arranged on the shell 1. The starting end of the left side of the arc striking piece 11 is overlapped with the arc spraying window 6. The arc passing through the arc extinguishing chamber 5 is blocked and cooled by the arc spraying window 6 and the arc striking plate 11, and the energy is further reduced, so that the arcing distance is limited and reduced, and the expected purpose is achieved. The striking plate 11 is installed in the shell 1 or on the shell cover 2. The utility model can be used as an AC/DC circuit breaker.
Claims (4)
1. A plastic shell type circuit breaker with a high-capacity arc extinguishing chamber comprises a circuit breaker body, a shell (1) and a shell cover (2), and is characterized in that: the cross section of the shell cover (2) is high and low on the left, the left part is not higher than the handle (7) after the shell cover is combined with the shell (1), and an arc extinguishing chamber (5) is arranged below the left part; an arc striking sheet (11) is additionally arranged in the arc extinguishing chamber (5), the arc striking sheet (11) is a special-shaped metal sheet, and the arc striking sheet (11) starts from the right side of the shell cover (2) above the arc extinguishing chamber (5) and extends to the upper part of the moving contact (4) along the right side wall of the shell cover, so that the shape of the arc striking sheet (11) is attached to the shape of the inner wall of the shell cover (2).
2. The molded case circuit breaker with high capacity arc chute according to claim 1, characterized in that: an arc spraying window (6) is additionally arranged above the left side in the arc extinguishing chamber (5), the cross section of the arc spraying window (6) is in an inverted L shape, and the arc spraying window (6) is in a multi-layer structure.
3. The molded case circuit breaker with high capacity arc chute according to claim 1, characterized in that: the starting end of the left side of the arc striking piece (11) is overlapped with the arc spraying window (6).
4. The molded case circuit breaker with high capacity arc chute according to claim 1, characterized in that: the arc striking piece (11) is arranged in the shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321771922.3U CN220272408U (en) | 2023-07-07 | 2023-07-07 | Plastic shell type circuit breaker with high-capacity arc extinguishing chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321771922.3U CN220272408U (en) | 2023-07-07 | 2023-07-07 | Plastic shell type circuit breaker with high-capacity arc extinguishing chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220272408U true CN220272408U (en) | 2023-12-29 |
Family
ID=89313664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321771922.3U Active CN220272408U (en) | 2023-07-07 | 2023-07-07 | Plastic shell type circuit breaker with high-capacity arc extinguishing chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220272408U (en) |
-
2023
- 2023-07-07 CN CN202321771922.3U patent/CN220272408U/en active Active
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