Arc extinguishing chamber structure of a molded case circuit breaker

Abstract

The application provides a structure of an arc-extinguishing chamber of a molded case circuit breaker, which comprises two fixed plates, an arc-extinguishing sheet, and an arc-extinguishing baffle. The two fixed plates are arranged in parallel and are spaced apart from each other. The left and right sides of the arc-extinguishing sheet are fixedly connected with the two fixed plates. The rear side of the arc-extinguishing sheet is provided with a U-shaped slot. The arc-extinguishing sheet is provided with a plurality of arc-extinguishing sheets. The plurality of arc-extinguishing sheets are arranged at equal intervals in the up-down direction. The plurality of arc-extinguishing sheets are arranged in a manner that gradually moves forward from bottom to top. The slots on the plurality of arc-extinguishing sheets form an arc-shaped arc-extinguishing space. The arc-extinguishing baffle is arranged on the upper side and the rear side of the arc-extinguishing space. The arc-extinguishing baffle is provided with a second slot. The second slot is arranged corresponding to the arc-extinguishing space.

Description

Technical Field

[0001] This invention relates to an arc-extinguishing chamber structure for a molded case circuit breaker. Background Technology

[0002] An electric arc is a form of gas discharge. When a switch is closed or opened, and a sufficiently large external voltage exists between the contacts, and the circuit current reaches the minimum arc-forming current, an electric arc will form. The arc not only severely damages the contacts but also prolongs the time required to disconnect the circuit. Especially when a circuit fault occurs, failure to disconnect the power in time can cause damage to electrical appliances or even a fire, endangering the safety of personnel and equipment. Therefore, the arc-extinguishing chamber is an important component of a circuit breaker.

[0003] The function of the arc-extinguishing chamber is to eliminate the electric arc generated during breaking. The strength of the arc-extinguishing chamber's ability to extinguish the arc directly affects the breaking performance of the circuit breaker. The working principle of the arc-extinguishing chamber is that when an arc is generated, an arc-initiating block introduces the arc into the arc-extinguishing chamber, and then the arc-extinguishing discs in the arc-extinguishing chamber extinguish the arc. Studies have shown that during the arc-extinguishing process, the more arc-extinguishing discs that cut the arc, the higher the voltage drop on the arc, the less the arc can maintain combustion and it is quickly extinguished, resulting in better breaking capacity. The arc-extinguishing disc structure of the existing molded case circuit breaker arc-extinguishing chamber is shown in the figure below. It adopts an approximately parallel arrangement, which limits the distance the arc can be stretched under the same height and number of arc-extinguishing discs, thus affecting the breaking capacity of the circuit breaker. Summary of the Invention

[0004] In response to the problems pointed out in the background art, the present invention proposes an arc-extinguishing chamber structure for a molded case circuit breaker, which can improve the breaking capacity of the circuit breaker.

[0005] The technical solution of this invention is implemented as follows:

[0006] An arc-extinguishing chamber structure for a molded case circuit breaker includes two fixed plates, which are spaced apart and parallel to each other. An arc-extinguishing plate is provided between the two fixed plates, with its left and right sides fixedly connected to the two fixed plates respectively. The rear side of the arc-extinguishing plate has a U-shaped slot. Multiple arc-extinguishing plates are provided, which are equidistantly spaced vertically and gradually move forward from bottom to top. The slots on the multiple arc-extinguishing plates form an arc-shaped arc-extinguishing space. The circuit breaker also includes an arc-extinguishing partition, which covers the upper and rear sides of the arc-extinguishing space. The arc-extinguishing partition has a second slot corresponding to the arc-extinguishing space. An arc-splitting partition is provided on the second slot. The arc-splitting partition has a V-shaped structure and includes a first arc-splitting plate and a second arc-splitting plate, both of which extend into the arc-extinguishing space. The first and second arc-splitting plates are of different lengths.

[0007] The present invention is further configured such that the arc-extinguishing baffle is fixedly connected to the fixing plate.

[0008] The present invention is further configured such that the left and right sides of the arc extinguishing plate are respectively provided with protruding connecting portions, and the fixing portion is provided with connecting holes that connect with the connecting portions.

[0009] The present invention is further configured such that one side of the arc extinguishing plate is provided with a connecting part, and the other side of the arc extinguishing plate is provided with two connecting parts.

[0010] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0011] The arc-extinguishing chamber structure of the molded case circuit breaker provided by the present invention, by setting equally spaced inclined arc-extinguishing plates, allows the length of the arc-extinguishing plates to be increased without increasing the number of arc-extinguishing plates, thereby increasing the contact area between the arc and the arc-extinguishing plates, increasing the time for the arc to move and cool on the arc-extinguishing plates, and thus improving the breaking capacity of the circuit breaker. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0015] Figure 3 This is a schematic diagram of the arc-extinguishing plate of the present invention;

[0016] Figure 4 This is a schematic diagram of the structure of the present invention. Figure 3 . Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] For reference as follows Figure 1-4The present invention will be described as follows:

[0019] An arc-extinguishing chamber structure for a molded case circuit breaker includes two fixed plates 1, which are spaced apart and parallel to each other. An arc-extinguishing plate 2 is provided between the two fixed plates 1, with its left and right sides respectively fixedly connected to the two fixed plates 1. A U-shaped slot 3 is provided on the rear side of the arc-extinguishing plate 2. Multiple arc-extinguishing plates 2 are provided, which are equidistantly spaced in the vertical direction and gradually move forward from bottom to top. The slots 3 on the multiple arc-extinguishing plates 2 form an arc-shaped arc-extinguishing space 4. The circuit breaker also includes an arc-extinguishing partition 5, which covers the upper and rear sides of the arc-extinguishing space 4. The arc-extinguishing partition 5 has a second slot 6, which corresponds to the arc-extinguishing space 4. The slot 6 is equipped with an arc-splitting partition, which has a V-shaped structure and includes a first arc-splitting plate 81 and a second arc-splitting plate 82. Both the first arc-splitting plate 81 and the second arc-splitting plate 82 extend into the arc-extinguishing space 4, and are arranged with one long and one short. The first arc-splitting plate 81 and the second arc-splitting plate 82 can separate the electric arc into two parts, which are then guided towards the arc-extinguishing plate 2. Guided by the long and short first arc-splitting plate 81 and the second arc-splitting plate 82, the two parts of the arc reach the arc-extinguishing plate 2 one after the other, thus creating a time difference between the arc extinguishing and the arc extinguishing plate 2, allowing the arc extinguishing plate 2 to extinguish the arc in two stages.

[0020] The arc-extinguishing baffle 5 is fixedly connected to the fixing plate 1.

[0021] The arc-extinguishing plate 2 has protruding connecting parts 7 on its left and right sides, and the fixing part has connecting holes that connect to the connecting parts 7.

[0022] The arc extinguishing plate 2 has a connecting part 7 on one side and two connecting parts 7 on the other side.

[0023] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0024] The arc-extinguishing chamber structure of the molded case circuit breaker provided by the present invention has an arc-extinguishing chamber with equally spaced inclined arc-extinguishing plates 2. Without increasing the number of arc-extinguishing plates 2, the length of the arc-extinguishing plates 2 can be increased, thereby increasing the contact area between the arc and the arc-extinguishing plates 2, increasing the time for the arc to move and cool on the arc-extinguishing plates 2, and thus improving the breaking capacity of the circuit breaker.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A structure of an arc-extinguishing chamber of a molded case circuit breaker, characterized by: The system includes two fixed plates, which are spaced apart and parallel to each other. An arc-extinguishing plate is positioned between the two fixed plates, with its left and right sides fixedly connected to the two fixed plates respectively. The arc-extinguishing plate has a U-shaped slot on its rear side. Multiple arc-extinguishing plates are arranged at equal intervals in the vertical direction, gradually moving forward from bottom to top. The slots on the multiple arc-extinguishing plates form an arc-shaped arc-extinguishing space. The system also includes an arc-extinguishing partition plate, which covers the upper and rear sides of the arc-extinguishing space. The partition plate has a second slot. The second slot corresponds to the arc-extinguishing space. The second slot is equipped with an arc-splitting partition, which has a V-shaped structure. The arc-splitting partition includes a first arc-splitting plate and a second arc-splitting plate, both of which extend into the arc-extinguishing space. The first and second arc-splitting plates are arranged with one longer than the other. The first and second arc-splitting plates can separate the electric arc into two parts and guide them towards the arc-extinguishing plate. Guided by the first and second arc-splitting plates of different lengths, the electric arc, which is divided into two parts, arrives at the arc-extinguishing plate one after the other, thus creating a time difference between the arc-extinguishing and the arc-extinguishing plates. In this way, the arc-extinguishing plate can extinguish the arc in two stages.

2. The arc quenching chamber structure of a molded case circuit breaker according to claim 1, wherein: The arc-extinguishing baffle is fixedly connected to the fixing plate.

3. The arc quenching chamber structure of a molded case circuit breaker according to claim 1, wherein: The arc-extinguishing plate has protruding connecting parts on its left and right sides, and the fixing plate has connecting holes that connect to the connecting parts.

4. The arc quenching chamber structure of a molded case circuit breaker according to claim 1, wherein: The arc extinguishing plate has a connecting part on one side and two connecting parts on the other side.

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