Arc extinguishing system of circuit breaker

Abstract

The utility model discloses an arc extinguishing system of a circuit breaker. The arc extinguishing system comprises an arc extinguishing device, a contact system, an air outlet assembly and a support. The arc extinguishing device is internally provided with segmented arc extinguishing grid sheet groups, and a plurality of expanded arc extinguishing grid sheet groups and arc extinguishing grid sheet groups are sequentially arranged at intervals, so that the number of arc extinguishing grid sheets is increased, and an electric arc generated by opening is divided into more short arcs, thereby improving the electric arc voltage and improving the electric arc extinguishing capability of the arc extinguishing device. Besides, the exhaust holes in the first insulating plate of the air outlet assembly are uniformly arranged, the positions of the exhaust holes in the second insulating plate correspond to those of the expanded arc-extinguishing grid groups, and the size of the exhaust hole corresponding to the expanded arc-extinguishing grid group in the middle is smaller than that of the exhaust holes corresponding to the expanded arc-extinguishing grid groups at the two ends. And the exhaust holes on the bracket correspond to the expanded arc-extinguishing grid sheet group in position and are the same as the expanded arc-extinguishing grid sheet group in size. According to the scheme, the arc extinguishing performance of a product can be improved on the premise of not changing the size of the arc extinguishing chamber when the circuit breaker breaks the fault current.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to an arc extinguishing system of a circuit breaker. Background Art

[0002] A circuit breaker is a critical electrical device that controls the flow of current in a circuit. It is able to carry and interrupt current under normal operating conditions and quickly cut off the current when abnormal conditions occur.

[0003] When a circuit breaker cuts off the current, an arc is generated. The design of the arc extinguishing system usually includes an arc splitting mechanism, such as a metal grid. These components can cut off a long arc and split it into multiple short arcs to achieve arc voltage division and cooling. This splitting effect helps to increase the arc voltage. As the number of applications increases, the voltage requirements are also increasing. In order to achieve a better arc extinguishing effect, it is often expected to increase the number of grids to split more arcs. However, due to the internal space constraints of the circuit breaker, it is particularly important to reasonably and effectively improve the arc extinguishing performance. Utility Model Content

[0004] Purpose of the utility model: In order to solve the problems existing in the prior art, the utility model provides an arc extinguishing system for a circuit breaker, which can effectively increase the number of arc divisions generated by opening the switch, thereby increasing the arc voltage and improving the arc extinguishing performance of the circuit breaker.

[0005] Technical solution: To achieve the above-mentioned purpose, the utility model can adopt the following technical solution: an arc extinguishing system of a circuit breaker, comprising an arc extinguishing device, a contact system, an air outlet assembly and a bracket; the arc extinguishing device comprises an arc extinguishing assembly and an insulating assembly; the contact system comprises a moving contact and a stationary contact;

[0006] The arc extinguishing assembly includes an upper arc-striking plate, an arc isolation wall, a segmented arc-extinguishing grid plate group, an arc-blocking member and a lower arc-striking plate; the segmented arc-extinguishing grid plate group includes a plurality of extended arc-extinguishing grid plate groups and arc-extinguishing grid plate groups that are arranged in sequence at intervals; the upper arc-striking plate and the segmented arc-extinguishing grid plate group are connected to the arc isolation wall at both ends; the lower arc-striking plate is fixedly mounted on the static contact of the contact system; the arc-blocking member is located between the intervals of the extended arc-extinguishing grid plate group, and the two ends are inserted into the arc isolation wall, which can block the arc transmission between the extended arc-extinguishing grid plate groups; the insulating assembly is inserted into the gap of the segmented arc-extinguishing grid plate group; the air outlet assembly is arranged opposite to the arc extinguishing device and is installed in the bracket.

[0007] By adjusting the arc extinguishing device and the corresponding air outlet assembly, this solution can ensure that when the circuit breaker disconnects the fault current, the arc extinguishing performance of the product is improved without changing the volume of the arc extinguishing chamber.

[0008] The arc isolation wall includes a left arc isolation wall and a right arc isolation wall respectively arranged on both sides; the multiple extended arc extinguishing grid plate groups and the two ends of the arc extinguishing grid plate groups are respectively riveted to the left arc isolation wall and the right arc isolation wall on both sides; the two ends of the upper arc starting plate are also respectively riveted to the left arc isolation wall and the right arc isolation wall on both sides; the two ends of the arc blocking member are respectively inserted into the left arc isolation wall and the right arc isolation wall on both sides.

[0009] The extended arc-extinguishing grid group includes two long grids and multiple short grids; the number of arc-extinguishing grids can be increased, and the arc generated by the opening switch can be divided into more short arcs, thereby increasing the arc voltage and improving the arc extinguishing ability of the arc extinguishing device. The grids in the arc-extinguishing grid group are longer on both sides and shorter in the middle, which can prevent the arc from crossing the grids and short-circuiting.

[0010] The long grid pieces of the extended arc-extinguishing grid piece group are provided with path grooves, so that the arc can be transmitted along the path grooves and fully enter the extended arc-extinguishing grid piece group, thereby improving the arc extinguishing capacity of the arc extinguishing device.

[0011] Furthermore, the insulating assembly includes a first insulating member and a second insulating member, and the first insulating member and the second insulating member are inserted into the gaps of the segmented arc-extinguishing grid group.

[0012] Furthermore, the air outlet assembly includes a first insulating plate, a second insulating plate and a metal woven mesh installed in a bracket.

[0013] The exhaust holes on the first insulating plate are arranged evenly, the positions of the exhaust holes on the second insulating plate correspond to the extended arc-extinguishing grid group, and the size of the exhaust holes corresponding to the middle extended arc-extinguishing grid group is smaller than the exhaust holes corresponding to the extended arc-extinguishing grid groups at both ends. The positions of the exhaust holes on the bracket correspond to the extended arc-extinguishing grid group and are the same size. When an arc is generated, the first insulating member and the second insulating member are eroded by the arc to generate gas, which increases the pressure inside the arc-extinguishing chamber and generates gas blowing, which is guided by the exhaust channel formed by the exhaust holes, which is conducive to the arc entering the extended arc-extinguishing grid group.

[0014] Furthermore, the bracket includes a frame, an exhaust plate, and a first support member and a second support member; the first insulating plate is fixedly connected to the first support member, the second insulating plate is fixedly connected to the first support member and the second support member respectively, the metal braided mesh is fixedly connected to the second support member and inserted into the frame; the exhaust hole position on the exhaust plate corresponds to the expanded arc extinguishing grid group and has the same size. The exhaust plate is connected to the frame by screws.

[0015] Beneficial effects: The utility model has the following advantages: 1) The segmented arc-extinguishing grid group includes a plurality of extended arc-extinguishing grid groups and arc-extinguishing grid groups. The plurality of extended arc-extinguishing grid groups and arc-extinguishing grid groups are arranged in sequence and riveted to the left arc-isolating wall and the right arc-isolating wall on both sides. This method can increase the number of arc-extinguishing grids and divide the arc generated by the switch into more short arcs, thereby increasing the arc voltage and improving the arc-extinguishing device's ability to extinguish the arc. 2) The exhaust holes on the first insulating plate of the air outlet assembly are evenly arranged, the positions of the exhaust holes on the second insulating plate correspond to the extended arc-extinguishing grid groups, and the size of the exhaust holes corresponding to the middle extended arc-extinguishing grid groups is smaller than the exhaust holes corresponding to the extended arc-extinguishing grid groups at both ends, and the positions of the exhaust holes on the bracket correspond to the extended arc-extinguishing grid groups and are the same size. This solution can ensure that when the circuit breaker disconnects the fault current, the arc extinguishing performance of the product is improved without changing the volume of the arc-extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the general assembly of the arc extinguishing system of the utility model;

[0017] Figure 2 It is a schematic diagram of the exploded components of the arc extinguishing system of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the segmented arc-extinguishing grid group in the utility model;

[0019] Figure 4 It is a schematic diagram of the assembly of the arc extinguishing device in the utility model;

[0020] Figure 5 This is a schematic structural diagram of the first insulating plate in the utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the second insulating plate in the utility model;

[0022] Figure 7 It is a schematic diagram of the structure of the exhaust plate in the utility model;

[0023] Figure 8 This is a schematic diagram of the assembly of the air outlet assembly in the utility model;

[0024] Fig. 9 It is an arc path diagram when the arc just enters the arc extinguishing system during the operation of the utility model;

[0025] Fig.10 It is an arc path diagram when the arc completely enters the arc extinguishing system during the operation of the utility model;

[0026] Fig.11 This is a schematic diagram of the arc path of the arc extinguishing system of the utility model.

[0027] In the figure: 1. Upper arc-starting plate; 2. Arc-isolating wall; 3. Segmented arc-extinguishing grid plate group; 4. Arc-blocking member; 5. Lower arc-starting plate; 6. Insulation assembly; 7. Air outlet assembly; 8. Bracket; 9. Moving contact; 10. Stationary contact; 11: Screw;

[0028] 21. Left arc-isolating wall; 22. Right arc-isolating wall; 31. Extended arc-extinguishing grid group; 32. Arc-extinguishing grid group; 311. Long grid; 312. Path groove; 61. First insulating member; 62. Second insulating member; 71. First insulating plate; 72. Second insulating plate; 73. Metal woven mesh; 81. Frame; 82. Exhaust plate; 831. First support member; 832. Second support member. DETAILED DESCRIPTION

[0029] Embodiment 1:

[0030] Please refer to Figure 1-Figure 11 The utility model discloses an arc extinguishing system for a circuit breaker, comprising an arc extinguishing device, a contact system, an air outlet assembly 7 and a bracket 8; the arc extinguishing device comprises an arc extinguishing assembly and an insulating assembly 6; the contact system comprises a moving contact 9 and a stationary contact 10;

[0031] Please refer to Figure 1-2 As shown, the arc extinguishing assembly includes an upper arc-striking plate 1, an arc isolation wall 2, a segmented arc-extinguishing grid plate group 3, an arc-blocking member 3 and a lower arc-striking plate 5; the insulating assembly 6 includes a first insulating member 61 and a second insulating member 62, and the first insulating member 61 and the second insulating member 62 are inserted into the gap of the segmented arc-extinguishing grid plate group 3.

[0032] Please refer to Figure 3-4 As shown, the segmented arc extinguishing grid group 3 includes a plurality of extended arc extinguishing grid groups 31 and arc extinguishing grid groups 32 arranged in sequence; the upper arc-starting plate 1 and the segmented arc extinguishing grid group 3 are connected to the arc isolation wall 2 at both ends; the lower arc-starting plate 5 is fixedly installed on the static contact 10 of the contact system; the arc-blocking member 4 is inserted between the intervals of each group of extended arc extinguishing grid groups 31, and the two ends are plugged into the arc isolation wall 2, which can block the arc transmission between the extended arc extinguishing grid groups; the insulating component 6 is inserted into the gap of the segmented arc extinguishing grid group 3; the air outlet component 7 is arranged opposite to the arc extinguishing device and installed in the bracket 8. The above installation method can increase the number of arc extinguishing grids, divide the arc generated by the opening switch into more short arcs, thereby increasing the arc voltage and improving the arc extinguishing ability of the arc extinguishing device. By adjusting the arc extinguishing device and the corresponding air outlet component, it can be ensured that the circuit breaker improves the arc extinguishing performance of the product without changing the volume of the arc extinguishing chamber when disconnecting the fault current.

[0033] The arc isolation wall 2 includes a left arc isolation wall 21 and a right arc isolation wall 22 on both sides; the two ends of the multiple extended arc extinguishing grid plate groups 31 and the arc extinguishing grid plate groups 32 are respectively riveted to the left arc isolation wall 21 and the right arc isolation wall 22 on both sides; the two ends of the upper arc-starting plate 1 are also respectively riveted to the left arc isolation wall 21 and the right arc isolation wall 22 on both sides; the two ends of the arc blocking member 4 are respectively inserted into the left arc isolation wall 21 and the right arc isolation wall 22 on both sides.

[0034] Please refer to Figure 3 As shown, the extended arc-extinguishing grid group 31 includes two long grids 311 and multiple short grids; the number of arc-extinguishing grids can be increased, and the arc generated by the opening switch can be divided into more short arcs, thereby increasing the arc voltage and improving the arc extinguishing ability of the arc extinguishing device. The grids in the arc-extinguishing grid group 32 are longer on both sides and shorter in the middle, which can prevent the arc from crossing the grid and short-circuiting. The long grids 311 of the extended arc-extinguishing grid group 31 are provided with path grooves 312, which can allow the arc to be transmitted along the path grooves 312 and fully enter the extended arc-extinguishing grid group, thereby improving the arc extinguishing ability of the arc extinguishing device.

[0035] Please also refer to Figure 2 As shown in Figures 5-7, the air outlet assembly 7 includes a first insulating plate 71, a second insulating plate 72 and a metal woven mesh 73 installed in a bracket 8. The exhaust holes on the first insulating plate 71 are evenly arranged, and the positions of the exhaust holes on the second insulating plate 72 correspond to the extended arc-extinguishing grid group 31, and the size of the exhaust holes corresponding to the middle extended arc-extinguishing grid group 31 is smaller than the exhaust holes corresponding to the extended arc-extinguishing grid groups 31 at both ends. The positions of the exhaust holes on the bracket 8 correspond to the extended arc-extinguishing grid group 31 and are the same size. When an arc is generated, the first insulating member 61 and the second insulating member 62 are eroded by the arc to produce gas, which increases the pressure inside the arc-extinguishing chamber and generates gas blowing, which is guided through the exhaust channel formed by the exhaust holes, which is conducive to the arc entering the extended arc-extinguishing grid group 31.

[0036] Please refer to Figure 8 As shown, the bracket 8 includes a frame 81, an exhaust plate 82, a first support member 831 and a second support member 832; the first insulating plate 71 is fixedly connected to the first support member 831, the second insulating plate 72 is fixedly connected to the first support member 831 and the second support member 832 respectively, the metal braided mesh 73 is fixedly connected to the second support member 832 and inserted into the frame 81; the exhaust hole position on the exhaust plate 82 corresponds to the expanded arc extinguishing grid group 31 and has the same size. The exhaust plate 82 is connected to the frame 81 by four screws 11.

[0037] In addition, please refer to Fig. 9As shown, when a fault current occurs, the arc just enters the arc extinguishing system, and the arc moves downward from the upper arc-starting plate 1 along the extended arc-extinguishing grid group 31 and the arc-extinguishing grid group 32 until it moves to the lower arc-starting plate 5.

[0038] Please refer to Fig.10 As shown in the figure, when a fault current occurs, the arc fully enters the arc extinguishing system. Due to the effects of air blowing and magnetic blowing, the arc enters the back of the grid from the upper arc-starting plate 1 along the path groove 312 on the extended arc-extinguishing grid group 31, and then moves downward to enter the arc-extinguishing grid group 32, and repeats this cycle until the arc moves to the lower arc-starting plate 5.

[0039] It should be noted that if there is no structure such as the arc extinguishing grid group 31, please refer to Fig.11 As shown, when a fault current occurs, under the action of air blowing and magnetic blowing, the arc continuously moves downward from the upper arc-starting plate 1 along the arc-extinguishing grid until it moves to the lower arc-starting plate 5. At this time, when the arc completely enters the arc-extinguishing system, the number of arcs cut by the arc-extinguishing system of this embodiment is 3 / 8 more than that of the comparative arc-extinguishing system.

[0040] The utility model increases the number of arc extinguishing grids by designing a segmented arc extinguishing grid group 31, divides the arc generated by the switch into more short arcs, thereby increasing the arc voltage and improving the arc extinguishing ability of the arc extinguishing device. The exhaust hole structure design of the air outlet assembly improves the ability of the arc to enter the grid group, which is more beneficial to the arc extinguishing performance. This solution can ensure that when the circuit breaker disconnects the fault current, the arc extinguishing performance of the product is improved without changing the volume of the arc extinguishing chamber.

Claims

1. An arc extinguishing system for a circuit breaker, comprising an arc extinguishing device, a contact system, an air outlet assembly and a bracket; characterized in that: The arc extinguishing device includes an arc extinguishing component and an insulating component; the contact system includes a moving contact and a stationary contact; The arc-extinguishing assembly includes an upper arc-striking plate, an arc-isolating wall, a segmented arc-extinguishing grid plate group, an arc-blocking member and a lower arc-striking plate; the segmented arc-extinguishing grid plate group includes a plurality of extended arc-extinguishing grid plate groups and arc-extinguishing grid plate groups that are arranged in sequence at intervals; the upper arc-striking plate and the segmented arc-extinguishing grid plate group are connected to the arc-isolating wall at both ends; the lower arc-striking plate is fixedly mounted on the static contact; the arc-blocking member is located between the intervals of the extended arc-extinguishing grid plate group, and its two ends are plugged into the arc-isolating wall; the insulating assembly is inserted into the gap of the segmented arc-extinguishing grid plate group; the air outlet assembly is arranged opposite to the arc-extinguishing device and is installed in the bracket.

2. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that: The arc isolation wall includes a left arc isolation wall and a right arc isolation wall respectively arranged on both sides; the multiple extended arc extinguishing grid plate groups and the two ends of the arc extinguishing grid plate groups are respectively riveted to the left arc isolation wall and the right arc isolation wall on both sides; the two ends of the upper arc starting plate are also respectively riveted to the left arc isolation wall and the right arc isolation wall on both sides; the two ends of the arc blocking member are respectively inserted into the left arc isolation wall and the right arc isolation wall on both sides.

3. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that: The extended arc-extinguishing grid group includes two long grids and a plurality of short grids; the grids in the arc-extinguishing grid group are longer at both sides and shorter in the middle.

4. The arc extinguishing system of the circuit breaker according to claim 3, characterized in that: The long grid plates of the extended arc-extinguishing grid plate group are provided with path grooves.

5. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that: The insulating assembly comprises a first insulating member and a second insulating member, and the first insulating member and the second insulating member are inserted into the gaps of the segmented arc-extinguishing grid group.

6. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that: The air outlet assembly includes a first insulating plate, a second insulating plate and a metal woven mesh installed in a bracket; the exhaust holes on the first insulating plate are evenly arranged, the positions of the exhaust holes on the second insulating plate correspond to the extended arc-extinguishing grid group, and the size of the exhaust holes corresponding to the middle extended arc-extinguishing grid group is smaller than the exhaust holes corresponding to the extended arc-extinguishing grid groups at both ends; the positions of the exhaust holes on the bracket correspond to the extended arc-extinguishing grid group and are the same size; the bracket includes a frame, an exhaust plate, and a first support member and a second support member; the first insulating plate is fixedly connected to the first support member, the second insulating plate is fixedly connected to the first support member and the second support member respectively, and the metal woven mesh is fixedly connected to the second support member and inserted into the frame; the positions of the exhaust holes on the exhaust plate correspond to the extended arc-extinguishing grid group and are the same size.

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