Circuit breaker arc extinguishing system and miniature circuit breaker

Abstract

The utility model discloses a circuit breaker arc extinguishing system and a miniature circuit breaker which are better in arc striking effect and suitable for large current. According to the technical scheme, the circuit breaker comprises an arc extinguish chamber and an arc striking mechanism, the arc striking mechanism comprises an arc striking plate, a magnetic conductive rod, a magnetic conductive sheet and an arc isolating sheet, the lower end of the arc striking plate is arranged at the bottom of the arc extinguish chamber, the upper end of the arc striking plate extends to the position below a moving contact of the circuit breaker, the magnetic conductive rod is arranged between a static contact of the circuit breaker and the arc extinguish chamber, and the magnetic conductive sheet is arranged on the arc isolating sheet. The arc isolating sheet and the magnetic conductive sheet are sequentially arranged on the side face of a static contact of the circuit breaker and located in front of the arc extinguish chamber.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breakers, and in particular relates to a miniature circuit breaker. Background Technology

[0002] Miniature circuit breakers, also known as micro-circuit breakers, are electrical devices used to protect circuits. The structure of a traditional miniature circuit breaker includes: a housing and a tripping mechanism, an electromagnetic trip unit, and an arc-extinguishing system housed within the housing. A stationary contact is connected to the lower end of the electromagnetic trip unit, and the arc-extinguishing system is located on one side of the stationary contact. The arc-extinguishing system typically consists of an arc-extinguishing chamber and an arc-ignition mechanism. Traditional arc-ignition mechanisms are usually a single arc-ignition plate structure, resulting in poor arc-ignition performance and making them unsuitable for high-current circuit breakers. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a circuit breaker arc extinguishing system and miniature circuit breaker with better arc initiation effect and adaptability to large current.

[0004] To solve the above problems, the technical solution adopted by this utility model includes: an arc-extinguishing chamber and an arc-initiating mechanism. The arc-initiating mechanism includes an arc-initiating plate, a magnetic rod, a magnetic sheet, and an arc-isolating sheet. The lower end of the arc-initiating plate is placed at the bottom of the arc-extinguishing chamber, and the upper end extends to below the moving contact of the circuit breaker. The magnetic rod is disposed between the stationary contact of the circuit breaker and the arc-extinguishing chamber. The arc-isolating sheet and the magnetic sheet are sequentially disposed on the side of the stationary contact of the circuit breaker and located in front of the arc-extinguishing chamber.

[0005] The magnetic conductive sheet is closely attached to the outer side of the arc-blocking sheet. The upper end of the arc-blocking sheet is provided with a positioning groove. The end of the magnetic rod is positioned on the positioning groove and in contact with the magnetic conductive sheet.

[0006] The arc-blocking plate is provided with a first riveting post and a first positioning post, and the magnetic conductive plate is provided with a first riveting hole that mates with the first riveting post and a positioning hole that mates with the first positioning post.

[0007] The first positioning post has a second riveting hole at its center.

[0008] The inner side of the arc-blocking plate is provided with an arc-shaped arc-inducing groove, the upper end of which is close to the stationary contact of the circuit breaker and the lower end is close to the arc-extinguishing chamber.

[0009] The arc-blocking plate has positioning notches at both ends and a second positioning post on its side wall that abuts against the stationary contact of the circuit breaker.

[0010] The lower end of the arc-blocking plate extends to the side of the arc-inducing plate.

[0011] The arc-blocking plate has a retaining edge on one side.

[0012] A miniature circuit breaker includes a housing and a tripping mechanism and an electromagnetic trip unit disposed within the housing. The lower end of the electromagnetic trip unit is connected to a stationary contact. The housing is provided with an arc-extinguishing system for the circuit breaker as described above.

[0013] The housing is provided with an installation groove, a positioning rib, and a second riveting post. The arc-blocking plate is disposed in the installation groove. The positioning rib is positioned and engaged with the positioning notch on the arc-blocking plate. The second riveting post is riveted to the second riveting hole on the arc-blocking plate.

[0014] The advantages of the circuit breaker arc extinguishing system and miniature circuit breaker of this utility model are as follows: By setting the magnetic rod and magnetic sheet to be tightly connected together, the magnetic field formed when a large current passes through can quickly introduce the arc into the arc extinguishing chamber, thereby improving the breaking performance of the circuit breaker.

[0015] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the arc extinguishing system of the circuit breaker of this utility model;

[0017] Figure 2 This is an exploded view of the arc extinguishing system of the circuit breaker of this utility model;

[0018] Figure 3 This is a schematic diagram (front view) of the assembly between the magnetic rod, magnetic sheet and arc-blocking sheet of this utility model.

[0019] Figure 4 This is a schematic diagram (back side) showing the assembly of the magnetic rod, magnetic sheet, and arc-blocking sheet of this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the arc-blocking sheet of this utility model;

[0021] Figure 6 This is a structural schematic diagram of the miniature circuit breaker of this utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the shell of this utility model. Detailed Implementation Example 1:

[0023] Reference Figure 1-5As shown, the arc-extinguishing system of this utility model includes an arc-extinguishing chamber 1 and an arc-initiating mechanism 2. The arc-initiating mechanism 2 includes an arc-initiating plate 3, a magnetic rod 4, a magnetic sheet 5, and an arc-isolating plate 6. The lower end of the arc-initiating plate 3 is placed at the bottom of the arc-extinguishing chamber 1, and the upper end of the arc-initiating plate 3 extends below the moving contact 7 of the circuit breaker. The magnetic rod 4 is disposed between the stationary contact 8 of the circuit breaker and the arc-extinguishing chamber 1. Typically, the main body of the stationary contact 8 is V-shaped or U-shaped, and the magnetic rod 4 is vertically disposed at the center of the V-shape or U-shape. The arc-isolating plate 6 and the magnetic sheet 5 are sequentially disposed on the side of the stationary contact 8 of the circuit breaker, and the arc-isolating plate 6 and the magnetic sheet 5 are located in front of the arc-extinguishing chamber 1. The shape of the arc-isolating plate 6 is adapted to the receiving cavity of the circuit breaker housing, and is usually triangular. The magnetic rod 4 and the magnetic sheet 5 are usually made of iron rod and iron sheet, respectively, and are magnetized. The arc-isolating plate 3 is ideally made of flame-retardant engineering plastic. The arc-starting plate 3 is typically made of copper plate.

[0024] Preferably, the magnetic conductive sheet 5 is tightly fitted to the outer surface of the arc-blocking sheet 6. The upper end of the arc-blocking sheet 6 is provided with a positioning groove 9. The end of the magnetic conductive rod 4 is positioned in the positioning groove 9 and contacts the magnetic conductive sheet 5. The arc-blocking sheet 6 is provided with a first riveting post 10 and a first positioning post 11. The magnetic conductive sheet 5 is provided with a first riveting hole 12 that rivets with the first riveting post 10 and a positioning hole 13 that positions with the first positioning post 11. This structure allows the magnetic conductive rod, magnetic conductive sheet, and arc-blocking sheet to be integrally and stably mounted within the circuit breaker housing. Note: The positioning groove 9 is not limited to the attached... Figure 5 The V-shaped opening groove shown also includes other shapes of open and closed positioning grooves.

[0025] Preferably, the first positioning post 11 has a second riveting hole 14 at its center. The arc-blocking plate 6 can be riveted into the circuit breaker housing through the second riveting hole 14 to improve the stability of the assembly.

[0026] Preferably, the inner side of the arc-isolating plate 6 is provided with an arc-shaped arc-inducing groove 15, the upper end of the arc-inducing groove 15 being close to the stationary contact 8 of the circuit breaker, and the lower end of the arc-inducing groove 15 being close to the arc-extinguishing chamber 1, so as to better introduce the electric arc into the arc-extinguishing chamber 1.

[0027] Preferably, the arc-blocking plate 6 has positioning notches 16 at both ends, and the side wall of the arc-blocking plate 6 has a second positioning post 17 that abuts against the stationary contact 8 of the circuit breaker. The positioning notches 16 are positioned and engaged with the positioning ribs 22 inside the circuit breaker housing, and the second positioning post 17 abuts against the stationary contact 8 of the circuit breaker to further improve the assembly stability of the arc-blocking plate 6.

[0028] Preferably, the lower end of the arc-isolating plate 6 extends to the side of the arc-initiating plate 3. This isolates the arc-initiating plate 3 from the circuit breaker housing to prevent the arc from puncturing the housing and also further improves the arc-initiating effect.

[0029] Preferably, the arc-blocking plate 6 has a retaining edge 24 on one side. The magnetic conductive plate 5 is attached to the retaining edge 24 to improve the stability of the assembly. Example 2:

[0030] Reference Figure 6-7 As shown, the miniature circuit breaker of this utility model includes a housing 18 and a tripping mechanism 19 and an electromagnetic trip unit 20 disposed within the housing 18. The lower end of the electromagnetic trip unit 20 is connected to a stationary contact 8. The arc extinguishing system a of the circuit breaker described in Embodiment 1 is provided inside the housing 18.

[0031] Preferably, the housing 18 is provided with a mounting groove 21, a positioning rib 22, and a second riveting post 23. The arc-extinguishing plate 6 is disposed in the mounting groove 21. The positioning rib 22 is positioned and engaged with the positioning notch 16 on the arc-extinguishing plate 6. The second riveting post 23 is riveted to the second riveting hole 14 on the arc-extinguishing plate 6. This improves the stability of the assembly between the housing 18 and the circuit breaker arc-extinguishing system a.

[0032] The foregoing is not intended to limit the present invention in any way. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A circuit breaker arc extinguishing system, comprising an arc extinguishing chamber (1) and an arc ignition mechanism (2), characterized in that: The arc-starting mechanism (2) includes an arc-starting plate (3), a magnetic rod (4), a magnetic sheet (5), and an arc-blocking sheet (6). The lower end of the arc-starting plate (3) is placed at the bottom of the arc-extinguishing chamber (1), and the upper end extends to the bottom of the moving contact (7) of the circuit breaker. The magnetic rod (4) is arranged between the stationary contact (8) of the circuit breaker and the arc-extinguishing chamber (1). The arc-blocking sheet (6) and the magnetic sheet (5) are arranged sequentially on the side of the stationary contact (8) of the circuit breaker and in front of the arc-extinguishing chamber (1).

2. The circuit breaker arc extinguishing system according to claim 1, characterized in that: The magnetic sheet (5) is closely attached to the outer side of the arc-blocking sheet (6). The upper end of the arc-blocking sheet (6) is provided with a positioning groove (9). The end of the magnetic rod (4) is positioned on the positioning groove (9) and in contact with the magnetic sheet (5).

3. The circuit breaker arc extinguishing system according to claim 2, characterized in that: The arc-blocking plate (6) is provided with a first riveting post (10) and a first positioning post (11), and the magnetic conductive plate (5) is provided with a first riveting hole (12) that is riveted to the first riveting post (10) and a positioning hole (13) that is positioned to cooperate with the first positioning post (11).

4. The circuit breaker arc extinguishing system according to claim 3, characterized in that: The first positioning post (11) has a second riveting hole (14) at its center.

5. The circuit breaker arc extinguishing system according to claim 1, characterized in that: The inner side of the arc-blocking plate (6) is provided with an arc-shaped arc-inducing groove (15), the upper end of the arc-inducing groove (15) is close to the stationary contact (8) of the circuit breaker, and the lower end is close to the arc-extinguishing chamber (1).

6. The circuit breaker arc extinguishing system according to claim 1, characterized in that: The arc-blocking plate (6) has positioning notches (16) at both ends and a second positioning post (17) on its side wall that abuts against the stationary contact (8) of the circuit breaker.

7. The circuit breaker arc extinguishing system according to claim 1, characterized in that: The lower end of the arc-blocking plate (6) extends to the side of the arc-inducing plate (3).

8. The circuit breaker arc extinguishing system according to claim 1, characterized in that: The arc-blocking plate (6) has a retaining edge (24) on one side.

9. A miniature circuit breaker, comprising a housing (18) and a tripping mechanism (19) and an electromagnetic trip unit (20) disposed within the housing (18), wherein the lower end of the electromagnetic trip unit (20) is connected to a stationary contact (8), characterized in that: The housing (18) is provided with a circuit breaker arc extinguishing system (a) as described in any one of claims 1-8.

10. The miniature circuit breaker according to claim 9, characterized in that: The housing (18) is provided with an installation groove (21), a positioning rib (22), and a second riveting post (23). The arc-blocking plate (6) is disposed in the installation groove (21). The positioning rib (22) is positioned and engaged with the positioning notch (16) on the arc-blocking plate (6). The second riveting post (23) is riveted to the second riveting hole (14) on the arc-blocking plate (6).

Images