CN213958892U - Novel contact arc extinguishing device of circuit breaker - Google Patents
Novel contact arc extinguishing device of circuit breaker Download PDFInfo
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- CN213958892U CN213958892U CN202022500941.5U CN202022500941U CN213958892U CN 213958892 U CN213958892 U CN 213958892U CN 202022500941 U CN202022500941 U CN 202022500941U CN 213958892 U CN213958892 U CN 213958892U
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- moving contact
- circuit breaker
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Abstract
A novel arc extinguishing device for a contact of a circuit breaker belongs to the technical field of circuit breakers. The circuit breaker comprises an arc extinguish chamber and a contact system, wherein the contact system comprises a moving contact and a fixed contact, and the moving contact and the fixed contact control the on-off of a circuit of the circuit breaker through contact or separation; the arc-extinguishing chamber comprises a moving contact arc striking plate and a group of arc-extinguishing grid pieces arranged by a plurality of arc-extinguishing grid pieces
The arc-extinguishing grid group is characterized in that the moving contact arc striking plate is approximately U-shaped, and a first arm of the U-shaped moving contact arc striking plate extends upwards to
The second arm of the U-shaped moving contact arc striking plate corresponds to the moving contact at the left end of the arc extinguishing grid group, and the end part of the U-shaped moving contact arc striking plate is bent towards the moving contact. The advantages are that: the number of hot-line operations of the contact arc-extinguishing device is effectively increased, and the electric service life is prolonged; the stability of the breaking capacity of the circuit breaker is ensured.
Description
Technical Field
The utility model belongs to the technical field of the circuit breaker, concretely relates to novel contact arc extinguishing of circuit breaker device.
Background
The circuit breaker is the most important distribution equipment in a low-voltage distribution system, along with the continuous improvement of the requirements of power supply and power transmission and distribution equipment in power engineering, the performance requirements for circuit protection switches are higher and higher, and the miniaturization, high performance, modularization and high reliability are the main development directions of the molded case circuit breakers at the present stage. The contact arc extinguishing device is an important component of the molded case circuit breaker, and the shape and size design of a contact in a contact system are very critical and directly relate to the breaking capacity and the electrical service life of the molded case circuit breaker.
There is a need for a reasonable improvement of the contact arc extinguishing device structure of the existing circuit breaker. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a novel contact arc extinguishing device of circuit breaker, its structure through improving the moving contact striking board effectively promotes the electric life of circuit breaker and guarantees the stability of the disconnected ability of circuit breaker.
The utility model aims to solve the problems that the contact arc extinguishing device of the novel circuit breaker comprises an arc extinguishing chamber and a contact system, wherein the contact system comprises a moving contact and a static contact, and the moving contact and the static contact control the on-off of a circuit of the circuit breaker through contact or separation; the arc extinguishing chamber comprises a moving contact arc striking plate and a group of arc extinguishing grids arranged by a plurality of arc extinguishing grids
The arc-extinguishing grid group is in a shape of Chinese character 'U', the moving contact arc striking plate is approximately in a shape of Chinese character 'U', and a first arm of the moving contact arc striking plate extends upwards to
Left end of arc-extinguishing grid group in shape of Chinese character 'U'The second arm of the moving contact arc striking plate corresponds to the moving contact, and the end part of the moving contact arc striking plate is bent towards the moving contact.
In a specific embodiment of the present invention, the movable contact is located in the open position, and the second arm of the "U" shaped arc striking plate of the movable contact exceeds the movable contact rod body.
In another specific embodiment of the present invention, the free end of the movable contact is provided with an arc striking portion extending obliquely upward, and the end of the second arm of the U-shaped movable contact arc striking plate corresponds to the arc striking portion; when the circuit breaker is disconnected, namely in a state that the movable contact is opened upwards to the maximum position, a current path can be formed between the end part of the second arm and the arc ignition part.
In yet another specific embodiment of the present invention, the
Arc extinguishing grid pieces in the arc extinguishing grid piece group are arranged in a radial shape.
In still another specific embodiment of the present invention, the arc extinguish chamber further comprises a static contact striking plate, one end of the static contact striking plate is fixedly connected to the static contact, and the other end extends to
The lower end of the arc extinguishing grid group is shaped like a Chinese character 'ji'.
The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: by improving the structure of the moving contact arc striking plate, the end part of the second arm of the U-shaped moving contact arc striking plate is bent towards the moving contact, so that the number of live-line operation times of the contact arc extinguishing device is effectively increased, and the electric service life is prolonged; and can make electric arc stabilize between the tip of second arm and striking portion, guarantee the stability of circuit breaker breaking capacity.
Drawings
Fig. 1 is a schematic structural diagram of a contact arc extinguishing device of the present invention.
In the figure: 2. static contact; 3. moving contact, 31, free end, 311, arc striking plate; 4. arc extinguish chamber, 41 moving contact arc striking plate, 411 first arm, 412 second arm, 4121 end, 42 arc extinguish grid group, 421 arc extinguish grid piece, 422 upper arc extinguish grid group, 423 lower arc extinguish grid group, 43 fixed contact arc striking piece, 431 connecting section, 432 straight section.
Detailed Description
The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.
In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position shown in fig. 1, and thus, should not be interpreted as a specific limitation to the technical solution provided by the present invention.
In a plastic case circuit breaker, there are generally at least one fixed contact portion (e.g., a fixed contact) and at least one movable contact portion (e.g., a movable contact) for each pole, the fixed contact portion and the movable contact portion are connected to or disconnected from each other at the time of closing/opening of the circuit breaker, and an arc extinguishing device for extinguishing an arc generated at the time of connection or disconnection of the movable contact portion and a set of operating mechanism (not shown) for operating the movement of the movable contact portion to drive the movable contact portion to be connected to or disconnected from the fixed contact portion are further provided in a contact area.
The utility model relates to a fixed contact part, a movable contact part and an arc extinguishing device in the circuit breaker, in particular to a contact arc extinguishing device of a novel circuit breaker as shown in figure 1, wherein the circuit breaker comprises a contact arc extinguishing device which comprises an arc extinguishing chamber 4 and a contact system; the contact system comprises a fixed contact 2 and a movable contact 3 which are matched with each other, wherein the movable contact 3 is positioned above the fixed contact 2 and rotates relative to the fixed contact 2, so that the contact or the separation with the fixed contact 2 is realized, and the on-off of a circuit of the circuit breaker is controlled. The moving contact 3 rotating relative to the static contact 2 means that one end of the moving contact 3 is rotatably arranged relative to the fixed part thereof, while the other end is a free end 31, and the whole moving contact 3 rotates around a pivot point. The moving contact 3 is provided with two staying positions, and one staying position is a closed position, namely the staying position when the moving contact 3 is connected with the static contact 2; the other position is an open position, namely, the movable contact 3 rotates around a pivot point and is disconnected from the fixed contact 2 to be opened upwards to a final stop position. The movable contact 3 is switched between a closed position and an open position to close or open the circuit breaker.
More specifically, as shown in fig. 1, the arc extinguishing chamber 4 includes a moving contact arc striking plate 41 and a group of arc extinguishing grids 421 arranged in a substantially rectangular shape
A grid group 42 and a static contact arc striking plate 43. The L-shape is only a schematic one, regardless of the direction, i.e., L-shape is reversed to L-shape or rotated by a certain angle, which is also within the scope of the present invention; moreover, the reverse corner portion is not necessarily a right angle, and may be an acute angle or an obtuse angle, or may be an arc transition, and such similar modifications are within the scope of the present invention. Said
The arc-extinguishing grid group 42 in the shape of the Chinese character 'zi' comprises an upper arc-extinguishing grid group 422 and a lower arc-extinguishing grid group 423, wherein the upper arc-extinguishing grid group 422 is arranged above the arc-extinguishing grid group 421 in the transverse direction, the lower arc-extinguishing grid group 423 is arranged vertically, and one end of the lower arc-extinguishing grid group 423 is connected with one end of the upper arc-extinguishing grid group 422 and is positioned below the upper arc-extinguishing grid group 422.
Referring to fig. 1, the movable contact arc striking plate 41 is substantially U-shaped, and the U-shaped structure greatly enhances the electric field strength at this position, so as to be more favorable for guiding the electric arc into the arc extinguishing chamber 4, lengthen the length of the electric arc, increase the electric arc voltage, and greatly improve the breaking capacity. The first arm 411 of the U-shaped arc striking plate of the movable contact extends upwards to
The left end of the chevron-shaped arc chute blade group 42, i.e., the left end of the upper arc chute blade group 422; the second arm 412 of the U-shaped movable contact arc striking plate 41 corresponds to the movable contact 3, and the end 4121 thereof is bent toward the movable contact 3. And in the open position of said movable contact 3, the second arm 412 is beyond the movable contact rod. The free end 31 of the moving contact 3 is provided with an arc striking part 311 extending upwards in an inclined manner, and an end part 4121 of a second arm 412 of the U-shaped moving contact arc striking plate 41 corresponds to the arc striking part 311; when the circuit breaker is disconnected, that is, in a state where the movable contact 3 is opened upward to the maximum position, a current path can be formed between the end portion 4121 of the second arm 412 of the movable contact arc ignition plate 41 in the "U" shape and the arc ignition portion 311. And the arc can be stabilized between the end 4121 of the second arm 412 and the arc striking part 311, thereby ensuring the stability of the breaking capacity of the circuit breaker.
Please continue to refer to FIG. 1, described above
The arc-extinguishing grid pieces 421 in the arc-extinguishing grid group 42 are arranged in a radial shape. The radial shape is a distinct center, a plurality of radial lines are radially arranged from the center, the arc-extinguishing grid pieces 421 are arranged in a radial shape, that is, the arc-extinguishing grid pieces 421 are arranged on the plurality of radial lines in sequence, preferably, the center is a circle center, and the arc-extinguishing grid pieces 421 are arranged on the radial lines of the circle center. More preferably, the arc chute pieces 421 are arranged on the radiation lines distributed at equal angles. Of course, the arc chute pieces 421 can also be arranged on the radiation lines with unequal angular distribution. In this embodiment, only one kind of arc extinguishing grids 421 is required to be arranged in a radial shape
Specifically, the connecting line of the ends of the arc-extinguishing bars 421 of the upper arc-extinguishing bar group 422 close to the side of the contact system is at right angle with the connecting line of the ends of the arc-extinguishing bars 421 of the lower arc-extinguishing bar group 423 close to the side of the contact system, and the arc is along the direction indicated by the arrow in fig. 1Towards the gas outlet outflow, space utilization maximize like this, adjacent arc extinguishing bars piece 421 intervals increase gradually, and air outlet channel A crescent is favorable to electric arc entering bars piece for the electric arc that the circuit breaker further produced when breaking contact effectively in high voltage service environment lengthens, divides absolutely, extinguishes, thereby promotes the breaking performance of circuit breaker.
One end of the static contact arc striking sheet 43 is fixedly connected with the static contact 2, and the other end of the static contact arc striking sheet inclines downwards and extends to
The lower end of the arc chute group is below the bottom of the lower arc chute group 422. Specifically, one end of the static contact arc striking plate 43 is a connection section 431, and the other end is a straight section 432. The connecting section 431 is fixedly connected with the static contact 2, and the straight section 432 is arranged on
The lower arc chute group 423 of the arc chute group 42 is parallel to the lower arc chute group 423 below.
Claims (5)
1. A contact arc extinguishing device of a novel circuit breaker comprises an arc extinguishing chamber and a contact system, wherein the contact system comprises a moving contact and a fixed contact, and the moving contact and the fixed contact control the on-off of a circuit of the circuit breaker through contact or separation; the arc extinguishing chamber comprises a moving contact arc striking plate and a group of arc extinguishing grids arranged by a plurality of arc extinguishing grids
The arc extinguishing grid group is characterized in that the moving contact arc striking plate is approximately U-shaped, and a first arm of the U-shaped moving contact arc striking plate extends upwards to
The second arm of the U-shaped arc striking plate of the moving contact corresponds to the moving contact at the left end of the arc extinguishing grid group, and the end part of the U-shaped arc striking plate is bent towards the moving contact.
2. The contact arc extinguishing device of the novel circuit breaker according to claim 1, wherein the second arm of the U-shaped arc striking plate of the moving contact exceeds the moving contact rod body in the open position of the moving contact.
3. The contact arc extinguishing device of the novel circuit breaker as claimed in claim 1, wherein the free end of the moving contact is provided with an arc striking part extending obliquely upward, and the end of the second arm of the U-shaped moving contact arc striking plate corresponds to the arc striking part; when the circuit breaker is disconnected, namely in a state that the movable contact is opened upwards to the maximum position, a current path can be formed between the end part of the second arm and the arc ignition part.
4. The contact arc extinguishing device of the novel circuit breaker as claimed in claim 1, characterized in that
Arc extinguishing grid pieces in the arc extinguishing grid piece group are arranged in a radial shape.
5. The contact arc extinguishing device of the novel circuit breaker according to claim 1, characterized in that the arc extinguishing chamber further comprises a static contact arc striking plate, one end of the static contact arc striking plate is fixedly connected with the static contact, and the other end extends to
The lower end of the arc extinguishing grid group is shaped like a Chinese character 'ji'.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022500941.5U CN213958892U (en) | 2020-11-03 | 2020-11-03 | Novel contact arc extinguishing device of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022500941.5U CN213958892U (en) | 2020-11-03 | 2020-11-03 | Novel contact arc extinguishing device of circuit breaker |
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| Publication Number | Publication Date |
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| CN213958892U true CN213958892U (en) | 2021-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022500941.5U Active CN213958892U (en) | 2020-11-03 | 2020-11-03 | Novel contact arc extinguishing device of circuit breaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024017063A1 (en) * | 2022-07-18 | 2024-01-25 | 天津首瑞智能电气有限公司 | Moving contact of electric switch, and double-break rotary disconnector |
-
2020
- 2020-11-03 CN CN202022500941.5U patent/CN213958892U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024017063A1 (en) * | 2022-07-18 | 2024-01-25 | 天津首瑞智能电气有限公司 | Moving contact of electric switch, and double-break rotary disconnector |
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