Circuit breaker

Abstract

The utility model relates to power equipment, in particular to a circuit breaker, which comprises a static contact, a moving contact, an arc extinguish chamber, a first arc striking sheet and a stop dog, the arc extinguish chamber is transversely arranged, at least nineteen arc extinguish grid sheets are arranged in the arc extinguish chamber, the arc extinguish grid sheets are sequentially arranged along the transverse direction, and the first arc striking sheet is arranged on the static contact. One end, in contact with the moving contact, of the static contact and one end, in contact with the static contact, of the moving contact are both located in the arc extinguish chamber, the distance between the first arc striking sheet and the arc extinguish chamber is increased, and the stop block is arranged between the arc extinguish chamber and the first arc striking sheet. The circuit breaker provided by the utility model can shorten the arcing time of the arc and reduce the damage of the arc.

Description

Technical Field

[0001] This utility model relates to an electrical device, and more particularly to a circuit breaker. Background Technology

[0002] Current miniature arc-extinguishing structures suffer from several drawbacks. The moving contact is far from the arc-extinguishing chamber, requiring a considerable distance for the arc to travel from its generation to its entry into the chamber. This increases the arcing time and the associated hazards. Furthermore, the significant space between the moving contact and the chamber, without proper arc-extinguishing, further complicates arc extinguishing. Additionally, current miniature arc-extinguishing structures have limited arc-extinguishing capacity and thin arc-extinguishing grids that cannot withstand high-current interruptions. Moreover, at critical loads, when the photovoltaic system generates a critical current, the existing miniature arc-extinguishing structures produce a small arc insufficient to enter the chamber, resulting in prolonged arcing time, system damage, and threats to maintenance personnel safety. The air-blowing and magnetic-blowing mechanisms in existing miniature arc-extinguishing structures are ineffective at critical currents, hindering the arc's entry into the chamber. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a circuit breaker that can shorten the arcing time of an electric arc and reduce the hazards of an electric arc.

[0004] To address the aforementioned technical problems, this application provides the following technical solution:

[0005] This utility model discloses a circuit breaker, comprising a stationary contact, a moving contact, and an arc-extinguishing chamber. The arc-extinguishing chamber is arranged horizontally, and at least nineteen arc-extinguishing grid plates are arranged sequentially along the horizontal direction. The end of the stationary contact that contacts the moving contact and the end of the moving contact that contacts the stationary contact are both located within the arc-extinguishing chamber.

[0006] Furthermore, it also includes a first arc-inducing plate, which is located below the arc-extinguishing chamber. One end of the first arc-inducing plate extends into the arc-extinguishing chamber, and a gap is left between the first arc-inducing plate and the arc-extinguishing chamber.

[0007] Furthermore, it also includes a stop block, which is disposed between the arc-extinguishing chamber and the first arc-initiating plate.

[0008] Furthermore, it also includes a second arc-inducing piece, which is connected to the side of the stationary contact away from the moving contact, and the second arc-inducing piece extends along the arrangement direction of the arc-extinguishing grid pieces.

[0009] Furthermore, it also includes a stationary contact pad, which is connected to the second arc-starting plate and the stationary contact.

[0010] Furthermore, a gas generating element is provided in the arc extinguishing chamber, and a trapezoidal groove is provided on the gas generating element.

[0011] Furthermore, it also includes a contact plate and a magnetic yoke, wherein the contact plate, the magnetic yoke, the stationary contact, and the second arc-inducing plate form a U-shaped circuit.

[0012] Furthermore, the arc-extinguishing grid is divided into two columns, and the two columns of arc-extinguishing grids intersect each other.

[0013] Furthermore, the distance between the stationary contact and the moving contact is 8.5 mm.

[0014] Compared with the prior art, the circuit breaker of this utility model has at least the following beneficial effects:

[0015] This utility model of circuit breaker, because the ends of the stationary contact and the moving contact, as well as the ends of the moving contact and the stationary contact, are all located in the arc-extinguishing chamber, the arc generated during the opening and closing process is directly extinguished in the arc-extinguishing chamber, shortening the arc burning time, reducing the harm of the arc, and avoiding the difficulty of extinguishing the arc caused by burning for a period of time. When the critical current is generated, the arc generated during the opening and closing process does not need to travel a long track and can quickly enter the arc-extinguishing chamber for extinguishing, reducing the harm caused by the critical current. It also reduces the blank space between the arc-extinguishing chamber and the moving and stationary contacts, making it impossible for the arc to hide, thus reducing the overall arc hazard. In addition, the number of arc-extinguishing grids is increased, increasing the arc-extinguishing capacity of the arc-extinguishing chamber, increasing the arc-extinguishing performance of the arc-extinguishing chamber, and enabling it to withstand high current breaking.

[0016] The circuit breaker of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the stationary contact, moving contact, and arc-extinguishing chamber in the circuit breaker of this utility model;

[0018] Figure 2 This is a schematic diagram of the main cross-sectional structure of the circuit breaker of this utility model;

[0019] Figure 3 This is a side view sectional structural diagram of the circuit breaker of this utility model;

[0020] Figure 4 This is a structural diagram showing the positions of the stop block, arc-extinguishing chamber, and first arc-starting plate in the circuit breaker of this utility model. Detailed Implementation

[0021] like Figure 1 , Figure 2 , Figure 3As shown, the present invention discloses a circuit breaker, including a stationary contact 11, a moving contact 12, and an arc-extinguishing chamber 13. The arc-extinguishing chamber 13 is arranged horizontally, and a plurality of arc-extinguishing grid plates 131 are arranged inside the arc-extinguishing chamber 13. The plurality of arc-extinguishing grid plates 131 are arranged sequentially along the horizontal direction. The end of the stationary contact 11 that contacts the moving contact 12 and the end of the moving contact 12 that contacts the stationary contact 11 are both located inside the arc-extinguishing chamber 13. In this circuit breaker, since the end of the stationary contact 11 that contacts the moving contact 12 and the end of the moving contact 12 that contacts the stationary contact 11 are both located inside the arc-extinguishing chamber 13, the arc generated during the opening and closing process is directly extinguished in the arc-extinguishing chamber, shortening the arc burning time, reducing the harm of the arc, and avoiding the difficulty of extinguishing the arc caused by burning for a period of time. When the critical current is generated, the arc generated during the opening and closing process does not need to travel a long track and can quickly enter the arc-extinguishing chamber to extinguish the arc, reducing the harm caused by the critical current. Furthermore, the blank space between the arc-extinguishing chamber and the moving and stationary contacts is reduced, making it impossible for the arc to be hidden, thus reducing the overall harm of the arc.

[0022] Optionally, the circuit breaker of this invention further includes a first arc-starting piece 16, which is located below the arc-extinguishing chamber 13. One end of the first arc-starting piece 16 extends into the arc-extinguishing chamber 13, and a gap is left between the first arc-starting piece 16 and the arc-extinguishing chamber 13. Specifically, one end of the first arc-starting piece 16 is connected to the thermal deactivation system, and the other end extends into the arc-extinguishing chamber 13. When an electric arc is generated, it is deactivated by the electric arc and magnetic deactivation system to form a complete conductive circuit. The large distance between the arc-extinguishing chamber 13 and the first arc-starting piece 16 enhances the venting performance of the circuit breaker.

[0023] Optionally, such as Figure 4 As shown, the circuit breaker of this utility model also includes a stop block 17, which is disposed between the arc-extinguishing chamber 13 and the first arc-initiating plate 16. Specifically, the stop block 17 is integrally formed with the circuit breaker housing. By setting the stop block 17, the electric arc discharged in the arc-extinguishing chamber 13 is separated from the electric arc flowing through the first arc-initiating plate 16. The electric arc is cut into two uneven segments by the stop block 17. The energy of the segmented arc is less than that of the direct-injection arc, thus achieving the effect of rapid arc extinguishing.

[0024] Optionally, the circuit breaker of this utility model further includes a second arc-inducing piece 111, which is connected to the side of the stationary contact 11 away from the moving contact 12, and extends along the arrangement direction of the arc-extinguishing grid pieces 131. The second arc-inducing piece 111 is connected to the side of the stationary contact 11 away from the moving contact 12 to facilitate arc initiation.

[0025] Optionally, the circuit breaker of this utility model also includes a stationary contact pad 112. The stationary contact pad 112 is made of DMC material and is riveted to the arc-extinguishing chamber 13 and the second arc-leading plate 111. Since the moving contact 12 and the stationary contact 11 exert force on the stationary contact 11 during the closing process, the stationary contact 11 is easily deformed, which affects the product life. The stationary contact pad 112 can prevent the stationary contact 11 and the second arc-leading plate 111 from displacement and deformation caused by opening and closing, thus avoiding safety hazards.

[0026] Optionally, a gas generating element 132 is provided inside the arc-extinguishing chamber 13, and a trapezoidal groove 133 is provided on the gas generating element 132. Since the lower end of the trapezoidal groove 133 has a large opening and the upper end has a small opening, when a large electric arc and gas pressure are generated during the breaking process, the gas pressure at the end with the smaller opening is greater than the gas pressure at the end with the larger opening. This can prevent the electric arc from being injected into the mechanism end, allowing the electric arc to enter the arc-extinguishing chamber 13 better, thereby preventing the generated electric arc from moving in the opposite direction, and at the same time increasing the effect of air blowing to better blow the electric arc into the arc-extinguishing chamber.

[0027] Optionally, the circuit breaker of this utility model also includes a contact plate 14 and a magnetic yoke 15. The contact plate 14, magnetic yoke 15, stationary contact 11, and second arc-inducing plate 111 form a U-shaped circuit to increase magnetic blow and allow the electric arc to enter the arc-extinguishing chamber 13 better.

[0028] Optionally, at least nineteen arc-extinguishing grid plates 131 are provided, and the thickness of the arc-extinguishing grid plates 131 is 1 mm. Increasing the number and thickness of the arc-extinguishing grid plates 131 increases the arc-extinguishing capacity of the arc-extinguishing chamber, improves the arc-extinguishing performance of the arc-extinguishing chamber, and enables it to withstand high current interruption.

[0029] Optionally, the arc-extinguishing grid 131 is divided into two rows, with the two rows of arc-extinguishing grid 131 intersecting each other, making it easier for the arc-extinguishing chamber to cut off the current.

[0030] Optionally, the distance L between the stationary contact 11 and the moving contact 12 is 8.5 mm. Increasing the distance between the stationary contact 11 and the moving contact 12 makes it easier to extinguish the arc formed under low current critical load.

[0031] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A circuit breaker, characterized in that, It includes a stationary contact (11), a moving contact (12), and an arc-extinguishing chamber (13). The arc-extinguishing chamber (13) is arranged horizontally, and at least nineteen arc-extinguishing grid plates (131) are arranged in sequence along the horizontal direction. The end of the stationary contact (11) that contacts the moving contact (12) and the end of the moving contact (12) that contacts the stationary contact (11) are both located in the arc-extinguishing chamber (13).

2. The circuit breaker according to claim 1, characterized in that, It also includes a first arc-starting plate (16), which is located below the arc-extinguishing chamber (13). One end of the first arc-starting plate (16) extends into the arc-extinguishing chamber (13), and there is a gap between the first arc-starting plate (16) and the arc-extinguishing chamber (13).

3. The circuit breaker according to claim 2, characterized in that, It also includes a stop block (17), which is disposed between the arc-extinguishing chamber (13) and the first arc-inducing plate (16).

4. The circuit breaker according to claim 1, characterized in that, It also includes a second arc-inducing plate (111), which is connected to the side of the stationary contact (11) away from the moving contact (12) and extends along the arrangement direction of the arc-extinguishing grid plate (131).

5. The circuit breaker according to claim 4, characterized in that, It also includes a stationary contact pad (112), which is connected to the second arc-drawing plate (111) and the stationary contact (11).

6. The circuit breaker according to claim 1, characterized in that, The arc-extinguishing chamber (13) is provided with a gas-generating element (132), and the gas-generating element (132) is provided with a trapezoidal groove (133).

7. The circuit breaker according to claim 4, characterized in that, It also includes a contact plate (14) and a magnetic yoke (15), wherein the contact plate (14), the magnetic yoke (15), the stationary contact (11), and the second arc-inducing piece (111) form a U-shaped circuit.

8. The circuit breaker according to claim 7, characterized in that, The arc-extinguishing grid (131) is divided into two columns, and the two columns of arc-extinguishing grid (131) intersect each other.

9. The circuit breaker according to any one of claims 1-8, characterized in that, The distance between the stationary contact (11) and the moving contact (12) is 8.5 mm.

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