N - pole arc extinguishing device for a circuit breaker

Abstract

The present invention relates to a circuit breaker, in particular to an N-pole arc extinguishing device inside the circuit breaker. The present invention adopts the following technical solutions: An N-pole arc extinguishing device of a circuit breaker includes an N-pole static contact, an N-pole moving contact, an arc guiding plate, a middle seat and a base. The N-pole static contact includes a wiring part, a contact part and an arc guiding part. It is characterized in that: a clamping groove is provided on the middle seat or / and the base, and both the static contact and the arc guiding plate are arranged in the corresponding clamping grooves. The arc guiding plate includes a straight edge, a vertical edge and an inclined edge, wherein the inclined edge is inclined towards the straight edge, and an arc guiding area is formed between the inclined edge and the arc guiding part of the N-pole static contact. A notch is provided on one side of the vertical edge close to the base, and an exhaust channel is formed between the notch and the base. By adopting the above solution, the present invention overcomes the problems existing in the prior art and provides a new type of N-pole arc extinguishing device with movable and static contacts arranged at the N-pole and capable of realizing good arc extinguishing and exhaust functions.

Description

Technical Field

[0001] The present invention relates to a circuit breaker, in particular to an N - pole arc extinguishing device inside the circuit breaker. Background Art

[0002] The distribution boxes in some countries require that the incoming line of the N - pole and the outgoing lines of the N - pole and L - pole are on the same side. There are two ways for the N - pole: 1. The moving and static contacts of the N - pole are not set to be disconnected, that is, the N - pole is directly connected; 2. The moving and static contacts of the N - pole are set to be openable. Due to space problems, the arc - leading and exhaust of the N - pole are not very smooth, resulting in the burning of the contacts and the explosion of the product. Summary of the Invention

[0003] The present invention overcomes the problems existing in the prior art and provides a new type of N - pole arc extinguishing device with moving and static contacts for the N - pole and capable of achieving good arc extinguishing and exhaust functions.

[0004] To achieve the above object, the present invention adopts the following technical solution: An N - pole arc extinguishing device for a circuit breaker includes an N - pole static contact, an N - pole moving contact, an arc - leading plate, a middle seat and a base. The N - pole static contact includes a wiring part, a contact part and an arc - leading part. It is characterized in that: a card slot is provided on the middle seat or / and the base, and both the static contact and the arc - leading plate are arranged in the corresponding card slots. The arc - leading plate includes a straight edge, a vertical edge and an inclined edge, wherein the inclined edge is inclined towards the straight - edge side, and an arc - leading area is formed between the inclined edge and the arc - leading part of the N - pole static contact. A first buffer area and a second buffer area are respectively arranged on both sides of the vertical edge on the middle seat. A notch is provided on the side of the vertical edge close to the base, and an exhaust channel is formed between the notch and the base, and the exhaust channel communicates the first buffer area and the second buffer area.

[0005] By adopting the above - mentioned scheme, the high - pressure gas in the arc - leading area can pass through it, so that the first buffer area and the second buffer area can respectively enter the gas, greatly reducing the pressure in the arc - leading area. In addition, the exhaust channel is arranged here at the vertical edge, and the gas running from this position will not affect the installation of other components of the circuit breaker, nor will it cause other interferences, making the product structure simple and reasonable and reducing the product volume.

[0006] A further setting of the present invention is that: the first buffer area is arranged at the corresponding position of the area enclosed by the straight edge, the vertical edge and the inclined edge of the arc - leading plate, and the bottom of the first buffer area is recessed inward.

[0007] By adopting the above - mentioned scheme, the first buffer area is very scientifically arranged at the above - mentioned position, and there are no other components around this position. In addition, the first buffer area can be set as large as possible. The purpose of the recessed setting is also to increase the volume of the first buffer area and facilitate the setting of the exhaust channel.

[0008] A further setting of the present invention is that the straight edge and the vertical edge of the arc striking plate are perpendicularly arranged, and long convex ribs are arranged at positions corresponding to the arc striking area on the base and the middle seat, and the direction of the long convex ribs is approximately the same as the direction of the hypotenuse.

[0009] By adopting the above scheme, the creepage distance can be increased and the product is safer.

[0010] A further setting of the present invention is that a first arc separating convex rib is arranged on the middle seat and above the long convex rib, and a second arc separating convex rib opposite to the arc separating convex rib on the middle seat is arranged on the base.

[0011] By adopting the above scheme, the arc and gas will not reach the upper end of the circuit breaker. Since there are more components on the upper part of the circuit breaker, its safety is ensured.

[0012] A final setting of the present invention is that an L-shaped first baffle is arranged on the middle seat and below and on one side of the arc extinguishing area, a second baffle inserted opposite to the first baffle is arranged on the base, and the first baffle and the second baffle are inserted opposite to each other to form an arc separating surrounding edge. A first exhaust through hole communicating with the outside is arranged on the side surface of the concave part of the first buffer area, and a second exhaust through hole communicating with the outside is arranged on the side surface of the second buffer area.

[0013] By adopting the above scheme, the arc separating surrounding edge can well prevent the arc and gas from running out through the gaps of the shell, but discharge according to the set exhaust through holes and the positions of the buffer chamber and the exhaust through holes, etc., which greatly improves the safety of the product. The first exhaust through hole is arranged on the side surface of the concave part of the first buffer area, so that the first exhaust through hole is separated from the arc striking plate, and the installation of the arc striking plate and the safety of the product are not affected.

[0014] The present invention will be further described below in conjunction with specific embodiments. Brief Description of the Drawings

[0015] Figure 1 It is a structural diagram of the N-pole arc extinguishing device according to the embodiment of the present invention;

[0016] Figure 2 It is a structural diagram of the base according to the embodiment of the present invention;

[0017] Figure 3 It is a structural diagram of the middle seat according to the embodiment of the present invention;

[0018] Figure 4 It is a structural diagram of the arc striking plate according to the embodiment of the present invention;

[0019] Figure 5 It is a cross-sectional view reflecting the positional relationship between the first buffer area and the second buffer area according to the embodiment of the present invention;

[0020] Figure 6This is a cross-sectional view showing the relationship between the notch on the straight edge of the arc striking plate and the second buffer zone in the embodiment of the present invention;

[0021] Figure 7 This shows the positional relationship between the first buffer zone and the straight edge of the arc striking plate in the embodiment of the present invention. Specific implementation mode

[0022] As Figures 1-7 shown, an N-pole arc extinguishing device for a circuit breaker includes an N-pole static contact 1, an N-pole moving contact 2, an arc striking plate 3, a middle seat 4, and a base 5. The N-pole static contact 1 includes a wiring portion, a contact portion, and an arc striking portion. In the embodiment of the present invention, a card slot is provided on the middle seat 4 or / and the base 5, and the static contact 1 and the arc striking plate 3 are both arranged in the corresponding card slots. The arc striking plate 3 includes a straight edge 31, a vertical edge 32, and an inclined edge 33. The inclined edge 33 is inclined towards the straight edge 31, and an arc striking area 6 is formed between the inclined edge 33 and the arc striking portion of the N-pole static contact 1. A first buffer zone 46 and a second buffer zone 44 are respectively arranged on both sides of the vertical edge 32 on the middle seat 4. A notch 321 is provided on the side of the vertical edge 32 close to the base 5, and an exhaust passage is formed between the notch 321 and the base 5. The exhaust passage communicates with the first buffer zone 46 and the second buffer zone 44. In the above solution, the high-pressure gas in the arc striking area 6 can pass through it, so that the first buffer zone 46 and the second buffer zone 44 can respectively enter the gas, greatly reducing the pressure in the arc striking area 6. In addition, the exhaust passage is arranged here at the vertical edge 32, and the gas running from this position will not affect the installation of other components of the circuit breaker and will not cause other interferences, making the product structure simple and reasonable and reducing the product volume.

[0023] In the embodiment of the present invention, the straight edge 31 and the vertical edge 32 of the arc striking plate 3 are perpendicularly arranged. Here, the perpendicularity may not be absolute perpendicularity and may be appropriately inclined within an allowable range. Long convex ribs 51 and 41 are arranged at positions corresponding to the arc striking area 6 on the base 5 and the middle seat 4. Usually, multiple long convex ribs 51 and 41 are arranged, and the directions of the long convex ribs 51 and 41 are substantially the same as the direction of the inclined edge 33. By adopting the above solution, the creepage distance can be increased, the product is safer, and the long convex ribs 51 and 41 can generate gas to increase gas blowing.

[0024] In the embodiment of the present invention, the first buffer 46 is arranged corresponding to the area surrounded by the straight edge 31, the vertical edge 32 and the inclined edge 33 of the arc starting plate 3. The bottom of the first buffer 46 is recessed inward to form a recessed portion 461. With the above scheme, it is very scientific to arrange the first buffer 46 at the above position, where there are no other components around this position. In addition, the first buffer 46 can be set as large as possible. The purpose of the recessed setting is also to increase the volume of the first buffer 46 and facilitate the setting of the first exhaust through hole 462. On the middle seat 4 and above the long convex rib 41, there is a first arc separating convex rib 42, and on the base 5, there is a second arc separating convex rib 52 opposite to the first arc separating convex rib 42 on the middle seat 4. By adopting the above scheme, the arc and gas will not reach the upper end of the circuit breaker. Since there are many components on the upper part of the circuit breaker, to ensure its safety, the first arc separating convex rib 42 and the second arc separating convex rib 52 can be in contact with each other, or close to each other, or staggeredly inserted or corresponding. The first arc separating convex rib 42 and the second arc separating convex rib 52 can also be multiple, and the purpose is to prevent the arc and gas from reaching the upper end of the circuit breaker.

[0025] In the embodiment of the present invention, on the middle seat 4 and below and on one side of the arc extinguishing area 6, there is an L-shaped first baffle 43. On the base 5, there is a second baffle 53 inserted opposite to the first baffle 43. The first baffle 43 and the second baffle 53 are inserted opposite to form an arc separating surrounding edge. Here, the opposite insertion means that the two baffles are offset and abutted against each other. On the side surface of the recessed portion 461 of the first buffer 46, there is a first exhaust through hole 462 communicating with the outside, and on the side surface of the second buffer 44, there is a second exhaust through hole 441 communicating with the outside. With the above scheme, the arc separating surrounding edge can well prevent the arc and gas from running out through the gaps of the shell, but discharge according to the set exhaust through holes and the positions of the buffers 46, 44 and the exhaust through holes, etc. This greatly improves the safety of the product. The first exhaust through hole 462 is arranged on the side surface of the recessed portion 461 of the first buffer 46, so that the first exhaust through hole 462 is separated from the arc starting plate 3, which will not affect the installation of the arc starting plate and the safety of the product. Finally, it should be noted that the terms of the upper and lower positional relationships in this application document are described based on the Figure 1 view relationship of this application document.

Claims

1. The N - pole arc extinguishing device of a circuit breaker, comprising an N - pole static contact, an N - pole moving contact, an arc - guiding plate, a middle seat and a base. The N - pole static contact includes a wiring part, a contact part and an arc - guiding part. A clamping groove is arranged on the middle seat or / and the base, and both the N - pole static contact and the arc - guiding plate are arranged in the corresponding clamping grooves. It is characterized in that: The pilot arc plate includes a straight edge, a vertical edge, and an inclined edge. The inclined edge is inclined towards the straight edge, and an arc starting area is formed between the inclined edge and the arc starting part of the N-pole static contact. A first buffer area and a second buffer area are respectively arranged on the middle seat on both sides of the vertical edge. A notch is arranged on the side of the vertical edge close to the base, and an exhaust passage is formed between the notch and the base. The exhaust passage communicates with the first buffer area and the second buffer area.

2. The N - pole arc extinguishing device of the circuit breaker according to claim 1, wherein: The first buffer area is arranged corresponding to the area enclosed by the straight edge, the vertical edge, and the inclined edge of the pilot arc plate, and the bottom of the first buffer area is recessed inward.

3. The N - pole arc extinguishing device of the circuit breaker according to claim 1 or 2, characterized in that: The straight edge and the vertical edge of the pilot arc plate are perpendicular to each other. Long convex ribs are arranged at positions corresponding to the arc starting area on the base and the middle seat, and the direction of the long convex ribs is substantially the same as the direction of the inclined edge.

4. The N - pole arc extinguishing device of the circuit breaker according to claim 3, characterized in that: A first arc separating convex rib is arranged on the middle seat above the long convex rib, and a second arc separating convex rib opposite to the first arc separating convex rib on the middle seat is arranged on the base.

5. The N - pole arc extinguishing device of the circuit breaker according to claim 2, characterized in that: An L-shaped first baffle is arranged on the middle seat below and on one side of the arc extinguishing area. A second baffle inserted with the first baffle is arranged on the base. The first baffle and the second baffle are inserted with each other to form an arc separating surrounding edge. A first exhaust through hole communicating with the outside is arranged on the side surface of the recessed part of the first buffer area, and a second exhaust through hole communicating with the outside is arranged on the side surface of the second buffer area.

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