Circuit breaker

Abstract

The invention 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 piece and a check block, the arc extinguish chamber is transversely arranged, a plurality of arc extinguish grid pieces are arranged in the arc extinguish chamber and sequentially arranged in the transverse direction, and the first arc striking piece is arranged on the first arc striking piece. 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 can shorten the arcing time of the electric arc and reduce the damage of the electric arc.

Description

Technical Field

[0001] The invention relates to electric power equipment, in particular to a circuit breaker. Background Art

[0002] The existing micro-breaking arc extinguishing structure has a long distance from the moving contact to the arc extinguishing chamber, so it needs to travel a long distance from the arc generation to the arc entering the arc extinguishing chamber, which increases the arc burning time and the harm caused. At the same time, since the moving contact is far away from the arc extinguishing chamber, there is a large space between the arc extinguishing chamber and the moving contact. There is no arc extinguishing chamber in this large space, which increases the difficulty of arc extinguishing. In addition, the arc extinguishing capacity of the existing micro-breaking arc extinguishing structure is limited, and the arc extinguishing grid is thin and cannot withstand high current interruption. In addition, when the photovoltaic system generates critical current at critical load, the arc of the existing micro-breaking arc extinguishing structure is too small to enter the arc extinguishing chamber, and the arc cannot be extinguished, resulting in a long arc burning time, damaging the system and threatening the safety of maintenance personnel. The air blowing and magnetic blowing in the existing micro-breaking arc extinguishing structure cannot play a corresponding role at the critical current, making it difficult for the arc to enter the arc extinguishing chamber. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a circuit breaker which can shorten the arc burning time of an arc and reduce the damage caused by the arc.

[0004] In order to solve the above technical problems, this application provides the following technical solutions:

[0005] A circuit breaker of the present invention comprises a static contact, a moving contact and an arc extinguishing chamber, wherein the arc extinguishing chamber is arranged transversely, and a plurality of arc extinguishing grids are arranged in the arc extinguishing chamber, and the plurality of arc extinguishing grids are arranged in sequence along the transverse direction, and one end of the static contact in contact with the moving contact and one end of the moving contact in contact with the static contact are both located in the arc extinguishing chamber.

[0006] Furthermore, it also includes a first arc-striking piece, which is located below the arc-extinguishing chamber, one end of the first arc-striking piece extends into the arc-extinguishing chamber, and a distance is left between the first arc-striking piece and the arc-extinguishing chamber.

[0007] Furthermore, it also includes a block, which is arranged between the arc extinguishing chamber and the first arc striking piece.

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

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

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

[0011] Furthermore, it also includes a contact plate and a yoke, and the contact plate, the yoke, the static contact, and the second arc-starting piece form a U-shaped loop.

[0012] Furthermore, the arc-extinguishing grid has a thickness of 1 mm.

[0013] Furthermore, the arc-extinguishing grids are divided into two rows, and the arc-extinguishing grids in the two rows cross each other.

[0014] Furthermore, the distance between the static contact and the moving contact is 8.5 mm.

[0015] Compared with the prior art, the circuit breaker of the present invention has at least the following beneficial effects:

[0016] In the circuit breaker of the present invention, since one end of the static contact in contact with the moving contact and one end of the moving contact in contact with the static contact are both located in the arc extinguishing chamber, the arc generated in the process of opening and closing the switch is directly extinguished in the arc extinguishing chamber, thereby shortening the arc burning time of the arc, reducing the harm of the arc, and avoiding the difficulty of arc extinguishing caused by extinguishing the arc after burning for a period of time; when the critical current is generated, the arc generated in the process of opening and closing the switch does not need to pass through a long runway, and can quickly enter the arc extinguishing chamber for arc extinguishing, thereby reducing the harm caused by the critical current, and reducing the blank space between the arc extinguishing chamber and the moving contact and the static contact, so that the arc cannot be hidden, thereby reducing the overall arc harm.

[0017] The circuit breaker of the present invention is further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the appearance structure of the static contact, the moving contact and the arc extinguishing chamber in the circuit breaker of the present invention;

[0019] Figure 2 It is a schematic diagram of the main cross-sectional structure of the circuit breaker of the present invention;

[0020] Figure 3 It is a schematic diagram of the side cross-sectional structure of the circuit breaker of the present invention;

[0021] Figure 4 It is a position structure diagram of the block, arc extinguishing chamber and first arc striking piece in the circuit breaker of the present invention. DETAILED DESCRIPTION

[0022] like Figure 1 , Figure 2 , Figure 3As shown, a circuit breaker of the present invention includes a static 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 grids 131 are arranged in the arc extinguishing chamber 13. The plurality of arc extinguishing grids 131 are arranged in sequence along the horizontal direction. One end of the static contact 11 in contact with the moving contact 12 and one end of the moving contact 12 in contact with the static contact 11 are both located in the arc extinguishing chamber 13. In the circuit breaker of the present invention, since one end of the static contact 11 in contact with the moving contact 12 and one end of the moving contact 12 in contact with the static contact 11 are both located in the arc extinguishing chamber 13, the arc generated in the process of opening and closing the switch is directly extinguished in the arc extinguishing chamber, thereby shortening the arc burning time of the arc, reducing the harm of the arc, and avoiding the difficulty of arc extinguishing caused by extinguishing the arc after a period of arc burning; when the critical current is generated, the arc generated in the process of opening and closing the switch does not need to pass through a long runway, and can quickly enter the arc extinguishing chamber for arc extinguishing, thereby reducing the harm caused by the critical current, and reducing the blank space between the arc extinguishing chamber and the moving contact and the static contact, so that the arc cannot be hidden, thereby reducing the overall arc harm.

[0023] Optionally, a circuit breaker of the present invention further includes a first arc-starting piece 16, which is located below the arc-extinguishing chamber, and one end of the first arc-starting piece 16 extends into the arc-extinguishing chamber 13, and a distance 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 release system, and the other end extends into the arc-extinguishing chamber 13. When an arc is generated, the arc is connected to the magnetic release to form a complete conductive circuit; a large distance is left between the arc-extinguishing chamber 13 and the first arc-starting piece 16 of the present invention, so that the exhaust performance of the circuit breaker is enhanced.

[0024] Alternatively, if Figure 4 As shown, a circuit breaker of the present invention further includes a stopper 17, which is disposed between the arc extinguishing chamber 13 and the first arc striking piece 16. Specifically, the stopper 17 is integrally formed with the circuit breaker housing, and the arc discharged from the arc extinguishing chamber 13 is separated from the arc flowing to the first arc striking piece 16 by providing the stopper 17, and the arc is cut into two uneven sections by the stopper 17, and the arc energy after cutting is less than the direct injection arc, so as to achieve the effect of rapid arc extinguishing.

[0025] Optionally, a circuit breaker of the present invention further includes a second arc-striking piece 111, which is connected to a side surface of the stationary contact 11 away from the moving contact 12, and the second arc-striking piece 111 extends along the arrangement direction of the arc-extinguishing grid pieces 131. The second arc-striking piece 111 is connected to a side surface of the stationary contact 11 away from the moving contact 12 to facilitate arc striking.

[0026] Optionally, a circuit breaker of the present invention further includes a static contact pad 112, which is pressed from DMC material. The static contact pad 112, the arc extinguishing chamber 13, and the second arc-striking piece 111 are riveted to each other. Since the force exerted on the static contact 11 during the closing process of the moving contact 12 and the static contact 11 may easily cause deformation of the static contact 11, thereby affecting the life of the product. The provision of the static contact pad 112 can prevent the static contact 11 and the second arc-striking piece 111 from displacement and deformation due to opening and closing of the switch, thereby avoiding potential safety hazards.

[0027] Optionally, a gas producing element 132 is provided in the arc extinguishing chamber 13, and a trapezoidal groove 133 is provided on the gas producing element 132. Since the trapezoidal groove 133 has a large opening at the lower end and a small opening at the upper end, when a large arc and gas pressure are generated during the breaking process, the gas pressure at the end with a small opening is greater than the gas pressure at the end with a large opening, thereby preventing the arc from spraying into the mechanism end, allowing the arc to better enter the arc extinguishing chamber 13, thereby preventing the generated arc from moving in the opposite direction, and at the same time increasing the gas blowing to better blow the arc into the arc extinguishing chamber.

[0028] Optionally, a circuit breaker of the present invention further includes a contact plate 14 and a yoke 15 . The contact plate 14 , the yoke 15 , the static contact 11 , and the second arc-striking piece 111 form a U-shaped loop to increase magnetic blowing so that the arc can better enter the arc extinguishing chamber 13 .

[0029] Optionally, at least nineteen arc extinguishing grids 131 are provided, and the thickness of the arc extinguishing grids 131 is 1 mm. The increasing number and thickness of the arc extinguishing grids 131 increase the arc extinguishing capacity and arc extinguishing performance of the arc extinguishing chamber, and can withstand high current interruption.

[0030] Optionally, the arc extinguishing grids 131 are divided into two columns, and the two columns of arc extinguishing grids 131 cross each other, so that the arc extinguishing chamber can cut off the current more easily.

[0031] Optionally, the distance L between the stationary contact 11 and the moving contact 12 is 8.5 mm. By increasing the distance between the stationary contact 11 and the moving contact 12, the arc formed at a small current critical load is easier to extinguish.

[0032] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A circuit breaker, characterized in that: The invention comprises a stationary contact (11), a moving contact (12), and an arc extinguishing chamber (13), characterized in that the arc extinguishing chamber (13) is arranged transversely, a plurality of arc extinguishing grids (131) are arranged in the arc extinguishing chamber (13), the plurality of arc extinguishing grids (131) are arranged in sequence in the transverse direction, and an end of the stationary contact (11) in contact with the moving contact (12) and an end of the moving contact (12) in contact with 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-striking piece (16), which is located below the arc-extinguishing chamber (13), one end of the first arc-striking piece (16) extends into the arc-extinguishing chamber (13), and a distance is left between the first arc-striking piece (16) and the arc-extinguishing chamber (13).

3. The circuit breaker according to claim 2, characterized in that: It also comprises a stopper (17), wherein the stopper (17) is arranged between the arc extinguishing chamber (13) and the first arc striking piece (16).

4. The circuit breaker according to claim 1, characterized in that: It also comprises a second arc-striking piece (111), the second arc-striking piece (111) being connected to a side surface of the stationary contact (11) away from the moving contact (12), and the second arc-striking piece (111) extending along the arrangement direction of the arc-extinguishing grid pieces (131).

5. The circuit breaker according to claim 4, characterized in that: It also comprises a stationary contact pad (112), wherein the stationary contact pad (112) is connected to the second arc-starting piece (111) and the stationary contact (11).

6. The circuit breaker according to claim 1, characterized in that: A gas producing element (132) is arranged in the arc extinguishing chamber (13), and a trapezoidal groove (133) is arranged on the gas producing element (132).

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 static contact (11), and the second arc-starting piece (111) form a U-shaped loop.

8. The circuit breaker according to claim 1, characterized in that: The arc extinguishing grid (131) has a thickness of 1 mm.

9. The circuit breaker according to claim 8, characterized in that The arc-extinguishing grids (131) are divided into two rows, and the arc-extinguishing grids (131) in the two rows cross each other.

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

Images