Arc extinguishing system and circuit breaker

Abstract

The utility model provides an arc extinguishing system and a circuit breaker, the arc extinguishing system comprises arc extinguishing grid sheets which are arranged at intervals, grid sheet grooves are formed on the arc extinguishing grid sheets, at least one tip part is formed at the groove bottom of each grid sheet groove, the tip parts of the adjacent arc extinguishing grid sheets are arranged in a staggered manner, and tip parts are formed at the groove bottom of each grid sheet groove. When the arc moves in the arc extinguish chamber, the resistance at the tip part is smaller, the arc can be broken down more easily, the arc can enter the arc extinguish chamber more quickly, the arc voltage can rise more quickly, the arcing time is shortened, and the arc can be extinguished more quickly; and the staggered arrangement of the tips can further lengthen the arc, so that the arc voltage is increased, and arc extinguishing is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to an arc extinguishing system of a circuit breaker. Background Art

[0002] In conventional molded case circuit breaker structures, arc extinguishing grids are mostly slotted or staggered. In order to better improve the arc extinguishing effect, most of them add U-shaped grooves a on the arc extinguishing grid 1 without increasing the cost, such as Figure 1 、 2 As shown; or by staggered arrangement of arc quenching grids 2, such as Figure 3 、 4 As shown, this further increases the arc length, increases the arc column voltage drop, and thus increases the arc voltage, making the arc extinguish faster. This conventional arc-extinguishing grid structure has a certain effect on lengthening the arc, but it is not very effective in interrupting arcs generated by small currents. During the small current interruption process, the magnetic field strength in the conductive circuit is relatively weak, and the magnetic blowing effect on the arc is poor. The arc has difficulty entering the arc extinguishing chamber and being cut by the grid, so the arc voltage cannot be increased. The arc continues to burn for a long time, and the product is severely ablated. Utility Model Content

[0003] Therefore, in order to address at least one of the above problems, the present invention provides an arc extinguishing system and a circuit breaker.

[0004] The utility model is implemented by the following scheme:

[0005] The utility model provides an arc extinguishing system, which comprises a plurality of arc extinguishing grids arranged at intervals. A grid slot is formed on each of the arc extinguishing grids, and at least one tip is formed at the bottom of the grid slot.

[0006] In one embodiment, the arc extinguishing system includes at least one pair of adjacent arc extinguishing grids, and the tips of the adjacent arc extinguishing grids are staggered.

[0007] In one embodiment, the tips of all adjacent arc-extinguishing grids are arranged in a staggered manner.

[0008] In one embodiment, a first long groove and a second long groove are provided at the bottom of the gate groove, and an angle is formed between the first long groove and the second long groove, thereby forming the tip at the bottom of the gate groove.

[0009] In one embodiment, the first long grooves and the second long grooves of the adjacent arc-extinguishing grids are arranged in a staggered manner.

[0010] In one embodiment, the tip between the first long groove and the second long groove is a main tip, and two secondary tips are formed on both sides of the first long groove and the second long groove.

[0011] In one embodiment, the first long groove and the second long groove have different inclination angles relative to the groove bottom of the gate groove.

[0012] In one embodiment, the first long grooves and the second long grooves of the adjacent arc-extinguishing grids are arranged alternately, and the first long grooves and the second long grooves of the adjacent arc-extinguishing grids are arranged correspondingly and have an included angle.

[0013] In one embodiment, the second long groove is substantially perpendicular to the groove bottom of the gate groove, and the angle formed between the first long groove and the second long groove is an acute angle.

[0014] In one embodiment, there are more than three pointed portions, forming a sawtooth structure.

[0015] In one embodiment, the arc extinguishing grid includes a base and a pair of grid legs, wherein the grid legs are connected to one side of the base, so that the arc extinguishing grid forms a U-shaped structure and the grid groove is formed on the arc extinguishing grid.

[0016] The present utility model also proposes a circuit breaker, which includes the arc extinguishing system as described above, as well as a moving contact, a static contact and a driving mechanism. The driving mechanism is used to drive the moving contact to engage or separate with the static contact, so that the moving contact has a moving contact movement trajectory M, the grid slot is arranged in the direction of the arc generated by the separation of the moving and static contacts, and the end of the arc extinguishing grid is aligned with the moving contact movement trajectory.

[0017] In one embodiment, the moving contact movement trajectory is an arc, and the arc-extinguishing grids are arranged in a fan-shaped structure.

[0018] In one embodiment, the arc extinguishing grid near one end of the static contact is roughly parallel to the static arc striking grid, and each arc extinguishing grid is roughly parallel to the extension direction of the moving contact at each corresponding position on the movement trajectory of the moving contact.

[0019] The technical solution provided by the utility model has the following technical effects:

[0020] The utility model provides an arc extinguishing system, in which at least one tip is formed at the bottom of a grid slot, and the tips of adjacent arc extinguishing grids are staggered. The tips are formed at the bottom of the grid slot, so that during the movement of the arc in the arc extinguishing chamber, the tip position has less resistance and is more likely to be broken down, so that the arc enters the arc extinguishing chamber more quickly, the arc voltage can be increased more quickly, the arc burning time is shortened, and the arc is extinguished more quickly; the staggered arrangement of the tips can further lengthen the arc, increase the arc voltage, and be more conducive to arc extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of an arc extinguishing device 1 in the prior art;

[0022] Figure 2 It is a front view of an arc extinguishing grid of an arc extinguishing device 1 in the prior art;

[0023] Figure 3 It is a front view of the arc extinguishing device 2 in the prior art;

[0024] Figure 4 It is a front view of the arc extinguishing grid of the second arc extinguishing device in the prior art;

[0025] Figure 5 is a front view of the arc extinguishing system of this embodiment;

[0026] Figure 6 1 is a front view of the arc-extinguishing grid of this embodiment;

[0027] Figure 7 yes Figure 5 Enlarged view of point A in the middle;

[0028] Figure 8 It is a front view of the arc extinguishing system, moving contact, static contact and driving mechanism of the circuit breaker in this embodiment. DETAILED DESCRIPTION

[0029] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0030] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0031] like Figure 5-8As shown, this embodiment provides an arc extinguishing system 10 for use in a circuit breaker, comprising a plurality of arc extinguishing grids 100 arranged at intervals, and mounting plates 200 located on both sides of the arc extinguishing grids 100. The arc extinguishing grids 100 are installed and fixed by the mounting plates 200 to form an arc extinguishing chamber structure.

[0032] The arc-quenching grid 100 comprises a base 101 and a pair of grid legs 102 and 103. Legs 102 and 103 are connected to one side of the base 101, forming a U-shaped structure. Grid slots 107 are formed in the arc-quenching grid 100, located at the open end of the U-shaped structure. When the arc-quenching system 10 is installed in a circuit breaker, the grid slots 107 face the direction of the arc generated by the separation of the moving and static contacts, making it easier for the arc to enter the arc-quenching system, significantly improving the circuit breaker's breaking capacity.

[0033] The bottom of the grid slot 107 is provided with a first long groove 104 and a second long groove 105. The first long groove 104 and the second long groove 105 are U-shaped groove structures. The first long groove 104 and the second long groove 105 form an angle between them, thereby forming a tip 106 at the bottom of the grid slot 107. The formation of the tip 106 at the bottom of the grid slot 107 can ensure that the arc has less resistance at the tip during its movement within the arc extinguishing chamber, making it easier to break down. This allows the arc to enter the arc extinguishing chamber more quickly, allowing the arc voltage to increase more quickly, shortening the arc burning time, and extinguishing the arc more quickly.

[0034] In this embodiment, the tip 106 between the first long slot 104 and the second long slot 105 is the main tip, and two secondary tips 108 are formed on both sides of the first long slot 104 and the second long slot 105. The tips formed on both sides of the first long slot 104 and the second long slot 105 are also more conducive to arc extinguishing.

[0035] In some embodiments, there are multiple, for example, three or more, spikes 106 forming a sawtooth structure, which is more conducive to arc extinguishing. Multiple spikes can be formed by providing more or fewer long grooves at the bottom of the grid slot. In other embodiments, the spikes can also be formed by protruding from the bottom of the grid slot.

[0036] In this embodiment, the arc extinguishing grids 100 in the arc extinguishing system 10 are arranged at intervals, and adjacent arc extinguishing grids 100 are arranged in a staggered manner, such as Figure 5-7 As shown, the tips 106 of adjacent arc-quenching grids 100 are staggered. In other embodiments, the tips of the arc-quenching grids arranged in an interlaced manner may also be aligned or substantially aligned. However, in this embodiment, the staggered arrangement of the tips 106 can further lengthen the arc, increase the arc voltage, and facilitate arc extinguishing.

[0037] In some embodiments, not every adjacent arc-quenching grid 100 may be arranged in a staggered arrangement, that is, at least one pair of adjacent arc-quenching grids 100 may be arranged in a staggered arrangement. For example, staggered arc-quenching grids 100 may be arranged every two or three grids. However, in this embodiment, all adjacent arc-quenching grids 100 are arranged in a staggered arrangement. Since the resistance to arc movement at the tip is smaller, the arc is more likely to be struck, allowing the arc to enter the arc extinguishing chamber more quickly. The staggered arrangement of the grid tips allows the arc to be elongated in a "Z" shape, allowing the arc voltage to rise higher, which is conducive to faster arc extinction, shortening the arc burning time, and achieving better arc extinguishing effect.

[0038] Furthermore, in this embodiment, adjacent arc-extinguishing grids 100 are arranged in a staggered manner, such as Figure 5-7 As shown, the first long slots 104 and second long slots 105 of adjacent arc-extinguishing grids 100 are arranged in a staggered arrangement. The staggered positions further elongate the arc, thereby improving the breaking capacity. Furthermore, the opening area is relatively large, making it easier for the arc to enter. Furthermore, the staggered tooth structure at the opening makes it easier to cut off the arc. This staggered structure further elongates the arc, significantly improving the breaking capacity of the circuit breaker.

[0039] Furthermore, the second long groove 105 is substantially perpendicular to the bottom of the grid groove 107, and the angle formed between the first long groove 104 and the second long groove 105 is an acute angle, so that the first long groove 104 and the second long groove 105 have different inclination angles relative to the bottom of the grid groove 107. In this way, when the first long grooves 104 and the second long grooves 105 of adjacent arc-extinguishing grids 100 are arranged in a staggered manner, the first long grooves 104 and the second long grooves 105 of adjacent arc-extinguishing grids 100 are arranged in a corresponding manner and have an angle, thereby forming a staggered structure at the angle position, so that the arc is further elongated, thereby improving the breaking capacity.

[0040] This embodiment further provides a circuit breaker, comprising the arc extinguishing system 10 as described above, as well as a moving contact 40, a static contact 30, and a drive mechanism 50. The drive mechanism 50 is used to drive the moving contact 40 to engage or disengage with the static contact 30, so that the moving contact 40 has a moving contact motion trajectory M. The grid slot 107 is arranged in the direction of the arc generated by the separation of the moving and static contacts. Furthermore, the end of the arc extinguishing grid 100 is aligned with the moving contact motion trajectory M, so that the moving contact 40 is at the same distance from the arc extinguishing grid 100, which facilitates the arc to enter the arc extinguishing chamber and be cut by the grid.

[0041] In this embodiment, the moving contact motion trajectory M is an arc, and the arc-quenching grids 100 in the arc-extinguishing chamber are arranged in a fan-shaped structure. In this fan-shaped arrangement, the arc-quenching grids 100 near one end of the static contact 30 are arranged approximately parallel to the static arc-strike grids 31. Furthermore, each arc-quenching grid 100 is arranged approximately parallel to the extending direction of the moving contact 40 at a corresponding position along the moving contact motion trajectory M. This facilitates arc entry into the arc-quenching chamber and being cut by the grids, thereby improving the arc-extinguishing capability of the arc-extinguishing system.

[0042] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.

Claims

1. An arc extinguishing system comprising a plurality of arc extinguishing grids arranged at intervals, each of the arc extinguishing grids having a grid slot formed thereon, characterized in that: At least one tip is formed at the bottom of the gate groove.

2. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing system includes at least one pair of adjacent arc extinguishing grids, and the tips of the adjacent arc extinguishing grids are staggered.

3. The arc extinguishing system according to claim 2, characterized in that: The tips of all adjacent arc-extinguishing grids are arranged in a staggered manner.

4. The arc extinguishing system according to claim 2, characterized in that: The bottom of the gate groove is provided with a first long groove and a second long groove, and an angle is formed between the first long groove and the second long groove, so that the tip is formed at the bottom of the gate groove.

5. The arc extinguishing system according to claim 4, characterized in that: The first long grooves and the second long grooves of the adjacent arc-extinguishing grids are arranged in a staggered manner.

6. The arc extinguishing system according to claim 4, characterized in that: The tip between the first long groove and the second long groove is a main tip, and two secondary tips are formed on both sides of the first long groove and the second long groove.

7. The arc extinguishing system according to claim 4, characterized in that: The first long groove and the second long groove have different inclination angles relative to the groove bottom of the gate groove.

8. The arc extinguishing system according to claim 7, characterized in that: The first long grooves and the second long grooves of the adjacent arc-extinguishing grids are arranged alternately, and the first long grooves and the second long grooves of the adjacent arc-extinguishing grids are arranged correspondingly and have an included angle.

9. The arc extinguishing system according to claim 7, characterized in that: The second long groove is substantially perpendicular to the groove bottom of the grid plate groove, and the angle formed between the first long groove and the second long groove is an acute angle.

10. The arc extinguishing system according to claim 1, characterized in that: There are more than three pointed parts, forming a sawtooth structure.

11. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing grid includes a base and a pair of grid legs, wherein the grid legs are connected to one side of the base, so that the arc extinguishing grid forms a U-shaped structure and the grid groove is formed on the arc extinguishing grid.

12. A circuit breaker, characterized in that: The arc extinguishing system comprises an arc extinguishing system as described in any one of claims 1 to 11, and a moving contact, a static contact and a driving mechanism, wherein the driving mechanism is used to drive the moving contact to engage or separate with the static contact, so that the moving contact has a moving contact movement trajectory, the grid slot is arranged toward the direction of the arc generated by the separation of the moving and static contacts, and the end of the arc extinguishing grid is aligned with the moving contact movement trajectory.

13. The circuit breaker according to claim 12, wherein: The moving contact has a moving trajectory of an arc, and the arc-extinguishing grids are arranged in a fan-shaped structure.

14. The circuit breaker according to claim 12, wherein: The arc extinguishing grid near one end of the static contact is roughly parallel to the static arc striking grid, and each arc extinguishing grid is roughly parallel to the extending direction of the moving contact at each corresponding position on the moving contact movement trajectory.

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