CN221352678U - Contact arc extinguishing structure of breaker or isolating switch - Google Patents
Contact arc extinguishing structure of breaker or isolating switch Download PDFInfo
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- CN221352678U CN221352678U CN202322656857.6U CN202322656857U CN221352678U CN 221352678 U CN221352678 U CN 221352678U CN 202322656857 U CN202322656857 U CN 202322656857U CN 221352678 U CN221352678 U CN 221352678U
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- 230000008859 change Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000000630 rising effect Effects 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 7
- 238000004880 explosion Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims 2
- 230000000171 quenching effect Effects 0.000 claims 2
- 238000010891 electric arc Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000001174 ascending effect Effects 0.000 description 4
- 230000008033 biological extinction Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The utility model relates to the technical field of low-voltage electrical equipment, and discloses a contact arc extinguishing structure of a circuit breaker or an isolating switch, which comprises a moving contact, a fixed contact and an arc extinguishing chamber, wherein the fixed contact is provided with a fixed arc striking sheet, and the moving contact is provided with a moving arc striking sheet, and the contact arc extinguishing structure is characterized in that: and each grid sheet in the arc extinguishing chamber is arranged in a height-fluctuation way, and a change curved surface formed on the bottom surface of each grid sheet is matched with the arc elongation process. The contact arc extinguishing structure has the advantages of good practicability, simple integral structure and convenient popularization and application.
Description
Technical Field
The utility model belongs to the technical field of low-voltage electrical equipment, and particularly relates to a contact arc extinguishing structure of a circuit breaker or an isolating switch.
Background
The low-voltage circuit breaker mainly comprises a controller, a contact system, an arc extinguishing device, an operating mechanism and the like, wherein the arc extinguishing device is a very important functional component of the low-voltage circuit breaker, and the performance of the arc extinguishing device plays a key role in whether the low-voltage circuit breaker can be reliably disconnected when a short circuit condition occurs.
Because the direct current system has no natural zero crossing phenomenon relative to the alternating current system, the arc can not be extinguished by utilizing the moment of zero crossing of the alternating current like alternating current, the arc can only be lengthened and cooled quickly, the voltage of the arc exceeds the voltage of a power supply, and then the arc is extinguished, so that the arc extinction is difficult, but the existing arc extinguishing chamber is used for improving the arc extinction capability by increasing the number of grid sheets, the volume of the arc extinguishing chamber is increased, and the current power system is contrary to the demand of the circuit breaker for miniaturization and high performance, so that a more optimized method is required to be sought for improving the arc extinction capability of the arc extinguishing chamber.
Disclosure of utility model
The utility model provides a contact arc extinguishing structure of a circuit breaker or a disconnecting switch, which accelerates the arc striking speed and improves the arc extinguishing capability by enabling a change curved surface formed on the bottom surface of each grid sheet to be consistent with a change curved surface in the process that an electric arc is elongated, so as to solve the technical problem that the conventional arc extinguishing chamber does not meet the small-size high-performance manufacturing requirement of an electric power system.
The utility model can be realized by the following technical scheme:
Further, a static striking plate is arranged at the position of the static contact, a movable striking plate is arranged at the position of the movable contact, the grid plates inside the arc extinguishing chamber are arranged in a height-fluctuation mode, and a change curved surface formed on the bottom surface of the arc extinguishing chamber is designed in a matched mode with the electric arc elongation process and is arranged to be ascending-horizontal-ascending-horizontal.
Further, the change curved surface formed on the bottom surface of the grid sheet is recorded as a first rising section, a first horizontal section, a second rising section and a second horizontal section, the highest point of the first rising section is consistent with the highest point of the motion track in the arc striking inclined surface switching-off process of the moving contact, and the inclination of the second rising section is consistent with that of the moving arc striking sheet.
Further, the inclination of the arc striking inclined plane of the moving contact is consistent with that of the moving arc striking sheet.
The beneficial technical effects of the utility model are as follows:
1. The contact arc extinguishing structure enables the arrangement trend of the grid plates to be matched with the change trend of arc elongation so as to accelerate the arc absorption speed, reduce the arc leakage and improve the arc extinguishing capability, thereby improving the arc extinguishing capability by the number of the existing grid plates under the condition that the whole volume of the arc extinguishing chamber is not increased as much as possible, and meeting the manufacturing requirement of the existing power system on the small volume and high performance of the arc extinguishing chamber.
2. The relative position relation of the moving contact, the moving striking plate, the static striking plate and the arc extinguishing chamber is considered, so that the change curved surface in the process of stretching the arc presents a rising-falling-rising trend, and each grid plate is arranged according to the rising-falling-rising trend, so that the change curved surface formed by the bottom surfaces of the grid plates is matched with the trend to be consistent, the whole arc stretching process is correspondingly carried out, the distance between the moving contact, the moving striking plate, the static striking plate and the arc extinguishing chamber is controlled, the arc can be sucked into the arc extinguishing chamber as quickly and completely as possible, and the arc extinguishing is accelerated.
3. The arc extinguishing chamber has the advantages of good practicality, simple integral structure and convenient popularization and application.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
the device comprises a 1-moving contact, a 2-fixed contact, a 3-arc extinguishing chamber and a 31-grid plate.
Detailed Description
The following detailed description of the utility model refers to the accompanying drawings and preferred embodiments.
As shown in fig. 1, the utility model provides a contact arc extinguishing structure of a circuit breaker or an isolating switch, which comprises a moving contact 1, a fixed contact 2 and an arc extinguishing chamber 3, wherein a fixed arc striking sheet is arranged at the position of the fixed contact 2, a moving arc striking sheet is arranged at the position of the moving contact 1, each grid sheet 31 in the arc extinguishing chamber 3 is arranged in a height-fluctuation manner, and a change curved surface formed on the bottom surface of the arc extinguishing chamber is matched with an arc elongating process. Like this, through setting up the change trend that the arrangement trend of bars sheet agrees with electric arc and lengthens to accelerate the arc-striking speed, reduce electric arc external leakage, improve the arc extinguishing ability, thereby under the circumstances that does not increase the whole volume of explosion chamber as far as possible, promote the arc extinguishing ability with current bars sheet quantity, satisfy the manufacturing demand of current electric power system to the small volume high performance of explosion chamber.
The method comprises the following steps:
Usually, an arc extinguishing chamber of a direct current circuit breaker adopts a magnetic blowing mode to extinguish arc, a moving contact of the direct current circuit breaker is formed by combining a plurality of short contact pieces and long contact pieces, meanwhile, an arc striking inclined plane is arranged at the end part of the long contact piece, so that an arc can be quickly transferred to the arc striking inclined plane, and is obliquely upwards elongated, meanwhile, a fixed arc striking piece and a moving arc striking piece are correspondingly arranged at the side, close to the fixed contact, of the arc extinguishing chamber, so that the arc is led into the arc extinguishing chamber to extinguish arc, in the process of opening the moving contact, the arc is obliquely upwards elongated to the arc striking inclined plane of the moving contact from the contact point between the fixed contact and the moving contact, the moving contact rotates to be far away from the fixed contact, the arc starts to descend beyond the highest point until the opening is completed, the arc is a first descending section under the driving of an operating mechanism, then the electric arc is transited to an active striking plate which is consistent with the slope of the striking inclined plane, and is a second ascending section, finally the electric arc is reversely guided back to the arc extinguishing chamber through the active striking plate, and has a reverse ascending trend, and is a second descending section, so that the change curved surface in the process of elongating the electric arc is marked as A, and is mostly marked as B in ascending-descending-the change curved surface formed by the bottom surface of the grid plate 31 at the corresponding position can be set as B, so that the trend of the change curved surface A and the trend of B are basically consistent, the head end of the first ascending section is connected with the static striking plate, the tail end of the second descending section is connected with the active striking plate, the distance between the two sections is limited, the electric arc can be sucked into the arc extinguishing chamber quickly, the arc extinguishing chamber is matched with the active striking plate and the static striking plate, the starting end and the stopping end of the electric arc are both led into the arc extinguishing chamber, and the leakage of the electric arc is reduced, therefore, the arc extinguishing capacity is improved by accelerating the arc suction speed instead of increasing the grid plate, the whole volume of the arc extinguishing chamber can be not increased as much as possible, the manufacturing requirement of the current power system on the miniaturization and high performance of the circuit breaker is met, the practicability is better, and the popularization and the application are facilitated.
Under the condition that the distance between the variable curved surfaces A and B is ensured to be relatively stable, the end parts of the movable contact move along a circular track, namely the movable contact is positioned at the position of the right-to-separate point when the brake is started, the end parts of the movable contact are possibly not positioned at the highest point of the circular track, but the electric arc still transits to the end parts of the movable contact and moves along the circular track, so that the highest point of the first ascending section can extend to the highest point of the circular track, the brake separating stroke is relatively smaller, the circular movement track of the end parts of the movable contact can be approximately straight, namely the first descending section can be replaced by the first horizontal section, and in order to transition the arc striking inclined surface of the electric arc driven contact to the movable striking sheet, the inclination of the first descending section and the second descending section are required to be identical, so that the arc extinguishing capability can be ensured under the condition that the trend of the variable curved surface B tends to the trend of the variable curved surface A, the arrangement complexity of the grid sheet is simplified, and the manufacturing cost is further reduced.
While particular embodiments of the present utility model have been described above, it will be appreciated by those skilled in the art that these are merely illustrative, and that many changes and modifications may be made to these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims.
Claims (3)
1. The utility model provides a contact arc extinguishing structure of circuit breaker or isolator, includes moving contact, stationary contact and explosion chamber, the position of stationary contact is provided with the static striking piece, the position of moving contact is provided with the moving striking piece, its characterized in that: the height of each grid sheet in the arc extinguishing chamber is arranged, and a change curved surface formed on the bottom surface of each grid sheet is matched with an arc elongation process to be designed into ascending-horizontal-ascending-horizontal.
2. The contact quenching structure of a circuit breaker or disconnector according to claim 1, characterized in that: the change curved surface formed on the bottom surface of the grid sheet is recorded as a first rising section, a first horizontal section, a second rising section and a second horizontal section, the highest point of the first rising section is consistent with the highest point of a motion track in the arc striking inclined surface opening process of the moving contact, and the inclination of the second rising section is consistent with that of the moving arc striking sheet.
3. The contact quenching structure of a circuit breaker or disconnector according to claim 2, characterized in that: the inclination of the arc striking inclined plane of the moving contact is consistent with that of the moving arc striking sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322656857.6U CN221352678U (en) | 2023-09-28 | 2023-09-28 | Contact arc extinguishing structure of breaker or isolating switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322656857.6U CN221352678U (en) | 2023-09-28 | 2023-09-28 | Contact arc extinguishing structure of breaker or isolating switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221352678U true CN221352678U (en) | 2024-07-16 |
Family
ID=91847415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322656857.6U Active CN221352678U (en) | 2023-09-28 | 2023-09-28 | Contact arc extinguishing structure of breaker or isolating switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221352678U (en) |
-
2023
- 2023-09-28 CN CN202322656857.6U patent/CN221352678U/en active Active
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