CN209963005U - Circuit breaker contact system - Google Patents
Circuit breaker contact system Download PDFInfo
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- CN209963005U CN209963005U CN201921056068.6U CN201921056068U CN209963005U CN 209963005 U CN209963005 U CN 209963005U CN 201921056068 U CN201921056068 U CN 201921056068U CN 209963005 U CN209963005 U CN 209963005U
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- circuit breaker
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Abstract
The utility model relates to a circuit breaker contact system, include upper end conductive bus, arrange in moving contact, static contact, explosion chamber in the casing of circuit breaker and arrange in arc extinguishing bars piece in the explosion chamber, upper end conductive bus is L type structure, include the follow horizontal portion that stretches out in the casing with be fixed in vertical portion on the casing, vertical portion still including respectively with the vertical section that the both ends of slope section are connected. Compared with the prior art, the utility model has the advantages of under the less condition of casing volume increase, arc extinguishing performance is showing the improvement.
Description
Technical Field
The utility model relates to a circuit breaker especially relates to a circuit breaker contact system.
Background
The circuit breaker is an important part in a distribution electrical appliance, is mainly used for an industrial low-voltage power system, is used for connecting and disconnecting current in a power grid circuit, and protects a line and power supply equipment from damage caused by faults such as overload, undervoltage, short circuit, single-phase grounding and the like.
The arc extinguishing system of the molded case circuit breaker usually adopts grid pieces to extinguish arcs, divides a fault arc into a plurality of small arcs, utilizes the near-cathode effect of an alternating current arc, reduces the fault current by increasing the voltage of the arc to achieve the arc extinguishing effect, and can improve the arc extinguishing performance by increasing the number of the grid pieces. However, when the number of the grids is increased, the width of the shell needs to be synchronously increased, so that the accommodating volume of the arc extinguish chamber is enlarged, the volume of the circuit breaker is increased, and the required installation space is correspondingly increased; and the conducting bus is fixed in the shell, so that the distance between the static contact and the moving contact is increased, and the requirement of the circuit breaker on the opening distance of the contact cannot be met. Therefore, the problem to be solved is how to improve the arc extinguishing performance under the condition of ensuring the distance between the static contact and the moving contact.
In order to improve the arc extinguishing capability under the condition that the size of the whole shell of the circuit breaker (namely the size enclosed by the upper cover and the base) is not changed, Chinese patent CN 207489795U discloses a high-voltage direct-current circuit breaker capable of improving the arc extinguishing capability, which comprises a base, a movable contact assembly, a fixed contact assembly and an arc extinguishing device; when breakpoints are connected in series, the moving contact and the static contact of two adjacent chambers are connected in series on the back of the base through a short-circuit conductor, so that at least one port of the two chambers on the base, which is close to the arc-extinguishing grid plates, is free without external wiring, and at least one arc-extinguishing grid plate in the arc-extinguishing device corresponding to the free port is provided with an extension section which extends and lengthens into the free port, so that the arc-extinguishing performance is improved by increasing the length of the arc-extinguishing grid plates. This patent device constructs the mutually supporting that utilizes the length arc control device of length one by one short and can reach better arc extinguishing effect through the length of suitable extension arc extinguishing bars piece, and the structure of arc extinguishing bars piece is complicated among the device, difficult processing manufacturing to some compact structure's circuit breaker, probably has the problem that does not have the extension space of arc extinguishing bars piece, consequently can not use this patent method.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a circuit breaker contact system in order to overcome the defect that above-mentioned prior art exists, this contact system can improve circuit breaker arc extinguishing performance.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a circuit breaker contact system, includes upper end conductive bus, arranges in moving contact, static contact, explosion chamber in the casing of circuit breaker and arrange in arc extinguishing bars piece in the explosion chamber, upper end conductive bus is L type structure, includes the follow horizontal portion that stretches out in the casing with be fixed in vertical portion on the casing, vertical portion still including respectively with the vertical section that the both ends of slope section are connected.
And the extending direction of the vertical section is taken as a reference, and the inclined section deviates 20-40 degrees towards the inside of the shell.
Preferably, the inclined section is offset toward the inside of the housing by 30 ° with reference to the extending direction of the vertical section.
The length of the inclined section is 0.3-0.4 of the total length of the vertical part.
The length of the vertical section between the transverse part and the inclined section is 0.4-0.5 of the total length of the vertical part.
The housing matches the shape of the vertical portion, and the vertical portion is fixed to the housing by a fastener.
The arc extinguishing grid pieces are arranged in the arc extinguishing chamber in parallel.
The static contact is fixed at the lower end of the vertical part.
The moving contact is connected with a lower end conductive bus through a flexible connection through a conductive sheet, and the lower end conductive bus extends out of the shell.
Compared with the prior art, the utility model has the advantages of it is following:
(1) an inclined section is designed at the vertical part of the L-shaped structure of the upper-end conductive bus, so that the arc extinguishing space of the arc extinguishing chamber is effectively enlarged, the number of arc extinguishing grids is increased, the distance between the movable contact and the fixed contact is unchanged, the arc extinguishing effect is enhanced, and the short circuit breaking capacity of the circuit breaker is effectively improved;
(2) the oblique angle of the oblique section is designed to be about 30 degrees, so that the capacity of the arc extinguish chamber can be increased by 15.5 percent and the breaking capacity of the circuit breaker can be improved by 25 percent for a common small circuit breaker;
(3) adopt the utility model discloses a contact system's circuit breaker, the outside volume of casing of circuit breaker increases slightly, and the part of buckling outwards in order to adapt to the slope section is the shell promptly, consequently, under the unchangeable condition basically of casing size, the arc extinguishing ability has had higher improvement.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the middle-upper end conductive bus of the present invention;
fig. 3 is a schematic structural view of a middle arc-extinguishing grid plate of the present invention;
FIG. 4 is a schematic diagram of a prior art arc chute;
in the figure, 1 is the explosion chamber, 2 is the upper end conducting bus, 21 is vertical portion, 211 is the slope section, 22 is horizontal portion, 3 is the static contact, 4 is the moving contact, 5 is the conducting strip, 6 is the lower extreme conducting bus, 7 is the flexible coupling, 8 is the casing, 9 is the arc extinguishing bars piece, L1 is the length of the vertical section that is located between horizontal portion and the slope section, L2 is the length of slope section.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
Example 1
A circuit breaker contact system comprises an upper end conductive bus 2, a movable contact 4, a fixed contact 3, an arc extinguish chamber 1 and arc extinguish grating sheets 9 which are arranged in parallel and distributed in the arc extinguish chamber 1, wherein the movable contact 4, the fixed contact 3 and the arc extinguish chamber 1 are arranged in a shell 8 of a circuit breaker, the upper end conductive bus 2 is of an L-shaped structure and comprises a transverse part 22 extending out of the shell 8 and a vertical part 21 fixed on the shell 8, and the fixed contact 3 is fixed at the lower end of the vertical part 21; the moving contact 4 is connected with a lower end conductive bus 6 through a conductive sheet 5 and a flexible connection 7, the lower end conductive bus 6 extends out of the shell 8, and the static contact 3 forms a current main loop contact system through contacting the moving contact 4, the conductive sheet 5, the flexible connection 7 and the lower end conductive bus 6.
In this embodiment, the upper end conductive bus bar 2 is a special-shaped conductive bus bar, as shown in fig. 2, wherein the vertical portion 21 includes a section of an inclined section 211 and vertical sections provided at two ends of the inclined section 211, the inclined section 211 is offset by 30 ° toward the inside of the housing 8 with reference to an extending direction of the vertical section, the inclined section 211 is located at a middle position of the vertical portion 21, a length L2 of the inclined section is 0.26 of a total length of the vertical portion, and a length L1 of the vertical section located between the horizontal portion and the inclined section is 0.42 of the total length of the vertical portion 21; in this embodiment, the entire width of the upper-end conductive bus bar 2 is 50mm, the length L1 of the vertical section between the lateral portion and the inclined section is 29mm, the length L2 of the intermediate inclined section is 18mm, and the length of the vertical section at the lower portion is 21.5 mm. The housing 8 is shaped to match the vertical portion 21 and is also provided with an inclined structure, as shown in fig. 1, and the vertical portion 21 is fixed to the housing 8 by fasteners.
The installation situation of arc extinguishing bars 9 in this embodiment is shown in fig. 3, compared with the installation situation of arc extinguishing bars 9 of the existing circuit breaker, as shown in fig. 4, because the upper end conductive bus 2 and the housing 8 are designed with the matched inclined structure, the length of the arc extinguishing chamber 1 is changed from the original 71mm to the current 82mm, the number of the arc extinguishing bars 9 inside the arc extinguishing chamber 1 is also changed from the original 12 to 15, that is, the length of the arc extinguishing chamber 1 is increased by 11mm, the arc extinguishing space of the arc extinguishing chamber is effectively enlarged, the number of the arc extinguishing bars is increased, the arc extinguishing effect is enhanced, and the short-circuit breaking capacity of the circuit breaker is further improved by 25%.
In the embodiment, the inclined section 211 is designed at the vertical part 21 of the L-shaped structure of the upper-end conductive bus, so that the arc extinguishing space of the arc extinguishing chamber is effectively enlarged, the number of arc extinguishing grids is increased, the distance between the movable contact and the fixed contact is unchanged, the arc extinguishing effect is enhanced, and the short circuit breaking capacity of the circuit breaker is effectively improved; the oblique angle of the oblique section 211 is designed to be about 30 degrees, so that the capacity of the arc extinguish chamber can be increased by 15.5 percent and the breaking capacity of the circuit breaker can be improved by 25 percent for a common small circuit breaker; adopt the utility model discloses a contact system's circuit breaker, the outside volume of casing of circuit breaker increases slightly, and the part of buckling is outwards in order to adapt to slope section 211 to the shell promptly, consequently, under the unchangeable condition basically of casing size, arc extinguishing ability has had higher improvement.
Example 2
The main structure of this embodiment is the same as that of embodiment 1, except that the specific size of the upper end conductive bus 2 is as follows: vertical portion 21 includes one section slope section 211 and locates the vertical section at this slope section 211 both ends to the extending direction of vertical section is the benchmark, and slope section 211 is inside skew 20 to casing 8 to slope section 211 is located the intermediate position of vertical portion 21, and the length L2 of slope section is 0.3 of the total length of vertical portion, and the length L1 of the vertical section that is located between horizontal portion and the slope section is 0.5 of the total length of vertical portion 21.
Example 3
The main structure of this embodiment is the same as that of embodiment 1, except that the specific size of the upper end conductive bus 2 is as follows: the vertical portion 21 includes one section of slope section 211 and the vertical section of locating this slope section 211 both ends to the extending direction of vertical section is the benchmark, and the slope section 211 is inside skew 40 to the casing 8 to the slope section 211 is located the intermediate position of vertical portion 21, and the length of slope section 211 is 0.4 of the total length of vertical portion 21, and the vertical portion 21 length that is located between horizontal portion 22 and the slope section 211 is 0.4 of the total length of vertical portion 21.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A circuit breaker contact system comprises an upper end conductive bus (2), a movable contact (4), a fixed contact (3), an arc extinguish chamber (1) and an arc extinguish grating (9) which are arranged in a shell (8) of the circuit breaker, wherein the upper end conductive bus (2) is of an L-shaped structure and comprises a transverse part (22) extending out of the shell (8) and a vertical part (21) fixed on the shell (8),
characterized in that the vertical portion (21) comprises a segment of an inclined section (211).
2. A circuit breaker contact system as claimed in claim 1 wherein the vertical portion (21) further comprises vertical sections connected to both ends of the inclined section (211), respectively.
3. A circuit breaker contact system as claimed in claim 2 wherein the inclined section (211) is offset inwardly of the housing (8) by 20-40 ° with respect to the direction of extension of the vertical section.
4. A circuit breaker contact system according to claim 3 wherein the inclined section (211) is offset 30 ° towards the inside of the housing (8) with reference to the direction of extension of the vertical section.
5. A circuit breaker contact system according to claim 4 wherein the length (L2) of the inclined section is 03-0.4 of the total length of the vertical portion.
6. A circuit breaker contact system as claimed in claim 5 wherein the length (L1) of the vertical section between the transverse portion and the inclined section is 0.4-0.5 of the total length of the vertical portion.
7. A circuit breaker contact system as claimed in claim 4, characterized in that the housing (8) matches the shape of the vertical portion (21), and the vertical portion (21) is fixed to the housing (8) by means of fasteners.
8. A circuit breaker contact system according to claim 1, characterized in that the quenching bars (9) are arranged in parallel inside the quenching chamber (1).
9. A circuit breaker contact system as claimed in claim 1, wherein the stationary contact (3) is fixed to the lower end of the vertical portion.
10. A circuit breaker contact system as claimed in claim 1, wherein the movable contact (4) is connected by a flexible connection (7) via a conducting strip (5) to a lower conducting busbar (6), the lower conducting busbar (6) projecting from the housing (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921056068.6U CN209963005U (en) | 2019-07-08 | 2019-07-08 | Circuit breaker contact system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921056068.6U CN209963005U (en) | 2019-07-08 | 2019-07-08 | Circuit breaker contact system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209963005U true CN209963005U (en) | 2020-01-17 |
Family
ID=69248629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921056068.6U Active CN209963005U (en) | 2019-07-08 | 2019-07-08 | Circuit breaker contact system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209963005U (en) |
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2019
- 2019-07-08 CN CN201921056068.6U patent/CN209963005U/en active Active
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