A zero arc flash arc extinguishing chamber structure of a circuit breaker

Abstract

The utility model relates to a zero flying arc arc extinguishing chamber structure of circuit breaker, a zero flying arc arc extinguishing chamber structure of circuit breaker, including the casing formed by the upper cover, middle cover and base screw connection, install arc extinguishing chamber in the base, the upper and lower both ends of middle cover are equipped with corresponding several wiring terminals, the arc extinguishing chamber includes contact head support, the arc extinguishing grid piece of several connected in the both sides of contact head support and the peripheral baffle connected in the end of arc extinguishing grid piece, the peripheral baffle is equipped with the air outlet matched with the position of arc extinguishing grid piece, the base still is equipped with the baffle groove and the arc baffle of interference connection in baffle groove, the position of arc baffle corresponds with air outlet, is equipped with several through -holes on this arc baffle, the through -hole array forms the net -like structure, has realized arc baffle alignment air outlet, the arc baffle on the physical isolation blocks arc extinguishing chamber and does not completely extinguish the arc, the through -hole on arc baffle further separates arc, accelerates the remaining arc to extinguish, avoids the short circuit of circuit breaker because of the arc that sprays.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of arc extinguishing chambers of circuit breakers, in particular to a zero flying arc arc extinguishing chamber structure of a circuit breaker. BACKGROUND

[0002] The circuit breaker refers to a switching device capable of closing, carrying and opening the current under normal circuit conditions and capable of closing, carrying and opening the current under abnormal circuit conditions within a specified time, and can automatically cut off the circuit when serious overloads or short circuits and under-voltage faults occur, and has been widely applied. When the circuit breaker is disconnected, the arc generated by the arc is ejected to cause internal element short circuit, and the arc extinguishing chamber is usually arranged in the circuit breaker to prevent the circuit breaker, the arc is pulled into the arc extinguishing grid piece constituting the arc extinguishing chamber under the contraction force of the magnetic line, a long arc is divided into multiple short arcs, and all the short arcs are extinguished at the same time when the alternating current is zero. However, when the arc generated by cutting off the circuit is too large, the arc extinguishing chamber cannot completely extinguish the arc, and the flying arc ejected from the air outlet of the arc extinguishing chamber still causes the circuit breaker element short circuit. Therefore, it is an urgent technical problem to design a zero flying arc arc extinguishing chamber structure of a circuit breaker which can eliminate the residual arc and protect the internal elements of the circuit breaker. SUMMARY

[0003] The utility model discloses a zero flying arc arc extinguishing chamber structure of a circuit breaker to solve the above -mentioned problem.

[0004] The utility model discloses a zero flying arc arc extinguishing chamber structure of a circuit breaker, including the casing that is formed by the screw thread connection of upper cover, middle cover and base, the base is installed with arc extinguishing chamber, the upper and lower both ends of middle cover all are equipped with the integral molding a plurality of terminal slots, and the terminal slot is installed with binding post, the arc extinguishing chamber includes contact support, connects a plurality of arc extinguishing grid pieces on both sides of contact support and the peripheral baffle connected in the end of arc extinguishing grid piece, the contact support is equipped with the contact support for installing contact, the peripheral baffle is equipped with the air outlet that matches the position of arc extinguishing grid piece, the base still is equipped with baffle groove and the arc baffle of interference connection in baffle groove, the position of arc baffle corresponds with air outlet, and a plurality of through -holes are equipped on the arc baffle, and the through -hole array forms the net -like structure.

[0005] With the above structure, by connecting the arc-extinguishing grid to both sides of the contact support, and the outer baffle connected to the end of the arc-extinguishing grid with an outlet, when the contact on the contact support breaks and generates an arc, the arc enters the arc-extinguishing chamber and is pulled into the arc-extinguishing grid to both sides. The long arc is separated by the arc-extinguishing grid and decomposed into short arcs, which are extinguished when the AC current crosses zero. By setting a baffle groove in the base, and an arc-blocking plate is interference-fitted in the baffle groove, the position of the arc-blocking plate corresponds to the outlet. When the arc is not completely extinguished in the arc-extinguishing chamber, the remaining arc is ejected from the outlet. The arc-blocking plate physically isolates and blocks the lateral splashing and diffusion of the arc. Several through holes on the arc-blocking plate further separate the remaining arc, accelerate the extinguishing of the remaining arc, eliminate the flying arc ejected from the outlet of the arc-extinguishing chamber, and prevent the components inside the circuit breaker from short-circuiting due to the ejected arc.

[0006] As a further improvement of this utility model, the base has a plurality of positioning slots arranged inside, corresponding to the position and number of the wiring terminals. Each positioning slot contains an arc-extinguishing chamber. The end of the positioning slot is provided with a positioning plate, which abuts against the outer baffle. The positioning plate is provided with an opening corresponding to the air outlet.

[0007] With the above structure, multiple positioning slots are set in the base to correspond to the wiring terminals, and each positioning slot independently accommodates an arc-extinguishing chamber to extinguish the arcs generated by different phase poles. The positioning plate at the end of the positioning slot abuts against the outer baffle, making it easier to put the arc-extinguishing chamber into or take it out of the positioning slot. The opening on the positioning plate can avoid blocking the air outlet, so that the flying arc ejected from the arc-extinguishing chamber can hit the arc-blocking plate and be eliminated.

[0008] As a further improvement of this utility model, the housing is provided with a plurality of side arc-isolating plates located between the wiring terminals.

[0009] With the above structure, by setting multiple side arc-isolating plates between the terminals on the housing, physical barriers are formed between different phase poles, further preventing the formation of phase-to-phase short circuits due to arc overlap between different phase poles when the arc is ejected.

[0010] As a further improvement of this utility model, the housing is also provided with a partition groove corresponding to the side partition plate. One end of the partition groove extends to the front of the top cover to form an inlet and outlet. A protruding locking block is provided on one side edge of the groove opening. One end of the side partition plate is inserted into the partition groove and is provided with a locking groove that matches the locking block.

[0011] With the above structure, one end of the side arc-isolating piece is inserted into the arc-isolating groove, and a locking block on one side edge of the groove is engaged in the groove to prevent the side arc-isolating piece from falling out of the groove. One end of the arc-isolating groove extends to the front of the top cover to form an inlet and outlet, which can push the side arc-isolating piece to slide along the groove through the inlet and outlet, and then separate it from the groove. This allows for flexible selection of whether to install side arc-isolating pieces between the terminals based on the installation position of the circuit breaker and the size of the arc generated during actual use. Attached Figure Description

[0012] Fig. 1 The diagram shows the structure of the shell, partition groove, and side partition arc plate of this utility model.

[0013] Fig. 2 The diagram shows the internal structure of the base and the arc-extinguishing chamber in an explosion state.

[0014] Fig. 3 The diagram shows the trajectory of the electric arc inside and outside the arc-extinguishing chamber.

[0015] 1-Top cover, 2-Base, 3-Arc extinguishing chamber, 4-Terminal, 5-Contact support, 6-Arc extinguishing grid, 7-Outer baffle, 8-Air outlet, 9-Baffle groove, 10-Arc blocking plate, 11-Through hole, 12-Positioning groove, 13-Positioning plate, 14-Opening, 15-Side arc septum, 16-Septum groove, 17-Inlet / outlet, 18-Card block, 19-Card slot, 20-Middle cover. Detailed Implementation

[0016] like Figs. 1-3 The diagram illustrates a zero-flying arc-extinguishing chamber structure for a circuit breaker, comprising a housing formed by a top cover 1, a middle cover 20, and a base 2 threadedly connected together. An arc-extinguishing chamber 3 is installed within the base 2. The middle cover 20 has several integrally formed terminal slots at its upper and lower ends, each containing a terminal 4. The arc-extinguishing chamber 3 includes a contact support 5, several arc-extinguishing grids 6 connected to both sides of the contact support 5, and an outer perimeter baffle 7 connected to the ends of the arc-extinguishing grids 6. The contact support 5 has contact supports for mounting contacts. The outer perimeter baffle 7 has an air outlet 8 that matches the position of the arc-extinguishing grids 6. The base 2 also has a baffle groove 9 and an arc-blocking plate 10 interference-connected within the baffle groove 9. The position of the arc-blocking plate 10 corresponds to the air outlet 8. The arc-blocking plate 10 has several through holes 11 arranged to form a mesh structure.

[0017] By connecting the arc-extinguishing grid 6 to both sides of the contact support 5, and the outer baffle 7 connected to the end of the arc-extinguishing grid 6 and having an outlet 8, when the contact on the contact support breaks and generates an arc, the arc enters the arc-extinguishing chamber 3 and is pulled into the arc-extinguishing grid 6 to both sides. The long arc is separated by the arc-extinguishing grid and decomposed into short arcs, which are extinguished when the AC current crosses zero. By setting a baffle groove 9 in the base 2, and an arc-blocking plate 10 is interference-connected in the baffle groove 9, the position of the arc-blocking plate 10 corresponds to the outlet 8. When the arc is not completely extinguished in the arc-extinguishing chamber 3, the remaining arc is ejected from the outlet 8. The arc-blocking plate 10 physically isolates and blocks the lateral splashing and diffusion of the arc. Several through holes 11 on the arc-blocking plate 10 further separate the arc, accelerate the extinguishing of the remaining arc, eliminate the flying arc ejected from the outlet 8 of the arc-extinguishing chamber 3, and prevent the components in the circuit breaker from short-circuiting due to the ejected arc.

[0018] The base 2 has multiple positioning slots 12 arranged inside, corresponding to the position and number of the wiring terminals 4. Each positioning slot 12 contains an arc-extinguishing chamber 3. The end of the positioning slot 12 is provided with a positioning plate 13, which abuts against the outer baffle 7. The positioning plate 13 is provided with an opening 14 corresponding to the air outlet 8.

[0019] Multiple positioning slots 12 are provided in the base 2 to correspond to the wiring terminals 4, and each positioning slot 12 independently accommodates an arc-extinguishing chamber 3 to extinguish the arcs generated by different phase poles respectively; the positioning plate 13 at the end of the positioning slot 12 abuts against the outer baffle 7, so that the arc-extinguishing chamber 3 can be put into or taken out of the positioning slot 12 more neatly; the opening 14 on the positioning plate 13 can avoid blocking the air outlet 8, so that the flying arc ejected from the arc-extinguishing chamber 3 can hit the arc-blocking plate 10 and be eliminated.

[0020] The housing is provided with a plurality of side spacers 15 located between the terminals 4.

[0021] By setting multiple side arc-isolating plates 15 on the housing between the terminals 4, physical barriers are formed between different phase poles, further preventing the formation of phase-to-phase short circuits due to arc overlap between different phase poles when the arc is ejected.

[0022] The housing is also provided with a partition groove 16 corresponding to the side partition plate 15. One end of the partition groove 16 extends to the front of the upper cover 1 to form an inlet and outlet 17. A protruding locking block 18 is provided on one side edge of the groove opening of the partition groove 16. One end of the side partition plate 15 is inserted into the partition groove 16 and is provided with a locking groove 19 that matches the locking block 18.

[0023] One end of the side arc-isolating piece 15 is inserted into the diaphragm groove 16. The diaphragm groove 16 has a locking block 18 on one side edge of the groove opening that engages with the locking groove 19 to prevent the side arc-isolating piece 15 from falling out of the groove opening of the diaphragm groove 16. One end of the diaphragm groove 16 extends to the front of the upper cover 1 to form an inlet / outlet 17, which can push the side arc-isolating piece 15 to slide along the diaphragm groove 16 through the inlet / outlet 17 and then separate from the diaphragm groove 16. This allows for flexible selection of whether to install the side arc-isolating piece 15 between the terminals 4 according to the installation position of the circuit breaker and the size of the arc generated during actual use.

Claims

1. A zero-flying arc extinguishing chamber structure for a circuit breaker, comprising a shell formed by a top cover, a middle cover, and a base threadedly connected together, wherein an arc extinguishing chamber is installed within the base, characterized in that: The upper and lower ends of the middle cover are provided with several integrally formed terminal slots, and wiring terminals are installed in the terminal slots. The arc-extinguishing chamber includes a contact support, several arc-extinguishing grids connected to both sides of the contact support, and an outer baffle connected to the end of the arc-extinguishing grids. The contact support is provided with a contact support for installing the contacts. The outer baffle is provided with an air outlet that matches the position of the arc-extinguishing grids. The base is also provided with a baffle groove and an arc-blocking plate that is interference-connected in the baffle groove. The position of the arc-blocking plate corresponds to the air outlet. The arc-blocking plate is provided with several through holes, and the through holes are arranged to form a mesh structure.

2. The zero-flying arc extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The base has multiple positioning slots arranged inside, corresponding to the position and number of the wiring terminals. Each positioning slot contains an arc-extinguishing chamber. The end of the positioning slot is provided with a positioning plate, which abuts against the outer baffle. The positioning plate has an opening corresponding to the air outlet.

3. The zero-flying arc extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The housing is provided with multiple side arc-blocking plates located between the wiring terminals.

4. The zero-flying arc extinguishing chamber structure of a circuit breaker according to claim 3, characterized in that: The housing is also provided with a partition groove corresponding to the side partition plate. One end of the partition groove extends to the front of the top cover to form an inlet and outlet. A protruding locking block is provided on one side edge of the groove opening. One end of the side partition plate is inserted into the partition groove and is provided with a locking groove that matches the locking block.

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