Arc extinguishing structure of circuit breaker

Abstract

The utility model discloses an arc extinguishing structure of a circuit breaker, which comprises a static contact plate, a moving contact and an arc extinguishing chamber, the arc extinguishing chamber is arranged above the static contact plate in a sliding manner, and the arc extinguishing chamber comprises symmetrically arranged fixed plates and a top cover arranged on the fixed plates. A plurality of first grid pieces and second grid pieces are arranged between the fixing plates in a staggered mode below the top cover, the first grid pieces are provided with first arc striking grooves protruding upwards, and the second grid pieces are provided with second arc striking grooves protruding downwards. A plurality of third grid sheets and fourth grid sheets which are uniformly spaced are obliquely arranged below the second grid sheet; and a static contact matched with the moving contact is arranged on the static contact plate. According to the arc extinguishing structure of the circuit breaker, when the breaking current is too large or the arc energy is high, arc extinguishing can be carried out step by step according to regions and stages, arc extinguishing is thorough, the arc extinguishing effect is good, and the practicability is high.

Description

Technical Field

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

[0002] Circuit breakers are commonly used to control the on / off operation of circuits and automatically disconnect them when a fault occurs. Within the circuit breaker's arc extinguishing chamber, the moving and stationary contacts are rapidly disconnected. The voltage between them causes a discharge in the air, generating a high-temperature arc. This arc heats up the air inside the chamber, accelerating air ionization. At this point, the high-temperature arc is separated into multiple short arcs by the action of multiple arc-isolating grids within the arc extinguishing chamber. The metal arc-isolating grids enhance the arc's deionization effect, reducing the arc size and increasing the voltage, ultimately extinguishing the arc.

[0003] During the disconnection process of the circuit breaker, a large number of arcs will be generated. The existing arc extinguishing structure cannot effectively guide the arc into the arc extinguishing chamber during disconnection. When the product disconnects a large current and the arc energy is high, the arc striking effect is poor. Utility Model Content

[0004] The utility model aims to provide an arc extinguishing structure for a circuit breaker, which can realize arc extinguishing in different areas and stages, with complete arc extinguishing and good arc extinguishing effect.

[0005] To achieve the above-mentioned objectives, the present invention provides an arc extinguishing structure for a circuit breaker, comprising a stationary contact plate, a moving contact, and an arc extinguishing chamber, wherein the arc extinguishing chamber is slidably arranged above the stationary contact plate, the arc extinguishing chamber comprising symmetrically arranged fixed plates and a top cover arranged on the fixed plates, a plurality of first grid plates and second grid plates being staggeredly arranged between the fixed plates below the top cover, the first grid plates being provided with first arc-striking grooves protruding upward, the second grid plates being provided with second arc-striking grooves protruding downward, a plurality of evenly spaced third grid plates and fourth grid plates being obliquely arranged below the second grid plates, and a stationary contact cooperating with the moving contact being provided on the stationary contact plate.

[0006] Preferably, a slider is provided on the inner side wall of the lower end of the fixed plate, and a sliding groove corresponding to the slider is provided on the outer wall of the static touch plate.

[0007] Preferably, the top cover is plugged into the fixing plate via a plug-in portion, and the fixing plate is provided with a plug-in hole corresponding to the plug-in portion.

[0008] Preferably, a uniform interval is provided between the first grid plate and the second grid plate, and the first grid plate and the second grid plate have the same structure.

[0009] Preferably, a third arc-striking groove is horizontally arranged on the top cover, and the first arc-striking groove, the second arc-striking groove and the third arc-striking groove are all V-shaped.

[0010] Preferably, the third grid plate and the fourth grid plate have the same inclination angle and opposite inclination directions.

[0011] Preferably, an arc-starting plate is provided at one end of the static contact, and a plurality of evenly spaced partition columns are provided on the arc-starting plate. The cross-section of the partition columns is trapezoidal, and the end of the partition column away from the static contact is higher than the end close to the static contact.

[0012] Preferably, magnetizing parts are provided on both sides of the static contact, and the upper surfaces of the magnetizing parts are slightly higher than the upper surface of the static contact.

[0013] Therefore, the present invention adopts the above-mentioned arc extinguishing structure of the circuit breaker, and the beneficial effects are as follows:

[0014] (1) The utility model provides a sliding connection between the arc extinguishing chamber and the static contact plate, which is convenient for maintenance personnel to replace and repair in time.

[0015] (2) When the arc generated by the disconnected contacts enters the arc extinguishing chamber, the cavity enclosed by the first arc striking groove and the second arc striking groove provided in the utility model divides the arc into several parts for cutting, and the first grid and the second grid are staggered to better cut the arc.

[0016] (3) The third and fourth grids of the present invention are tilted and can disperse the arc in different directions, thereby reducing the energy generated by the arc.

[0017] (4) The utility model can realize arc extinguishing in different areas and stages, and the arc extinguishing is thorough and has a good arc extinguishing effect.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of an arc extinguishing structure embodiment of a circuit breaker of the present utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the arc extinguishing structure embodiment of a circuit breaker of the present invention after removing the arc extinguishing chamber;

[0021] Figure 3 This is a schematic diagram of the positions of the first grid and the second grid in an arc extinguishing structure embodiment of a circuit breaker according to the present invention;

[0022] Figure 4 This is a schematic diagram of the fixed plate structure of an arc extinguishing structure embodiment of a circuit breaker of the present utility model;

[0023] Figure 5It is a bottom view of the first grid of an arc extinguishing structure embodiment of a circuit breaker of the utility model.

[0024] Reference numerals

[0025] 1. Stationary contact plate; 2. Moving contact; 3. Arc extinguishing chamber; 4. Fixed plate; 5. Top cover; 6. Slider; 7. Slide groove; 8. Connecting part; 9. Socket; 10. First grid; 11. Second grid; 12. First arc-striking groove; 13. Second arc-striking groove; 14. Third grid; 15. Fourth grid; 16. Stationary contact; 17. Third arc-striking groove; 18. Arc-striking plate; 19. Separator column; 20. Magnetizing part. DETAILED DESCRIPTION

[0026] The technical solution of the present utility model is further described below through the accompanying drawings and embodiments.

[0027] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the usual meanings understood by persons of ordinary skill in the field to which this utility model belongs. The words "first", "second" and similar terms used in this utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] As shown in the figure, a circuit breaker's arc-extinguishing structure includes a stationary contact plate 1, a moving contact 2, and an arc-extinguishing chamber 3. The arc-extinguishing chamber 3 is slidably mounted above the stationary contact plate 1 and comprises symmetrically arranged fixed plates 4 and a top cover 5 mounted on the fixed plates 4. Sliders 6 are provided on the inner sidewalls of the lower ends of the fixed plates 4, and slots 7 corresponding to the slides 6 are provided on the outer wall of the stationary contact plate 1. The arc-extinguishing chamber 3 is slidably connected to the stationary contact plate 1, facilitating timely replacement and repair work by maintenance personnel.

[0029] The top cover 5 is plugged into the fixed plate 4 through the plug-in portion 8, and the fixed plate 4 is provided with a socket 9 corresponding to the plug-in portion 8. Prevent dust from entering the arc extinguishing device and affecting the arc extinguishing effect. Below the top cover 5, a number of first grids 10 and second grids 11 are staggered between the fixed plates 4. There is a uniform interval between the first grids 10 and the second grids 11, and the first grids 10 and the second grids 11 have the same structure. The first grid 10 is provided with a first arc-striking groove 12 protruding upward, and the second grid 11 is provided with a second arc-striking groove 13 protruding downward. When the arc generated by the disconnection of the contacts enters the arc extinguishing chamber 3, the cavity surrounded by the multiple first arc-striking grooves 12 and the second arc-striking grooves 13 divides the arc into several parts for reduction. The first grids 10 and the second grids 11 are staggered to better cut the arc.

[0030] Several evenly spaced third and fourth grids 14, 15 are arranged at an angle below the second grid 11. The third and fourth grids 14, 15 are tilted at the same angle and in opposite directions. When an arc enters this area, the tilted third and fourth grids 14, 15 disperse the arc in different directions, thereby reducing the energy generated by the arc.

[0031] The stationary contact plate 1 is provided with a stationary contact 16 that mates with the moving contact 2. A third arc-striking slot 17 is horizontally disposed on the top cover 5. When the interrupting current is large and the arc energy is high, the third arc-striking slot 17 can further reduce the residual arc, ensuring complete arc extinguishing. The first arc-striking slot 12, the second arc-striking slot 13, and the third arc-striking slot 17 are all V-shaped.

[0032] An arc striking plate 18 is provided at one end of the static contact 1 , and a number of evenly spaced separation columns 19 are provided on the arc striking plate 18 . The cross section of the separation column 19 is trapezoidal, and the end of the separation column 19 away from the static contact 1 is higher than the end close to the static contact 1 .

[0033] Magnetization parts 20 are provided on both sides of the static contact 1 , and the upper surfaces of the magnetization parts 20 are slightly higher than the upper surface of the static contact 1 .

[0034] During actual use of this device, the moving contact 2 and the static contact 16 generate an arc. This arc is first dispersed by the separator 19 on the arc-striking plate 18, and then quickly introduced into the arc-extinguishing chamber 3. After the dispersed arc enters the arc-extinguishing chamber 3, the cavity enclosed by the multiple first arc-striking slots 12 and second arc-striking slots 13 further divides the arc into several parts for regional reduction. The inclined third and fourth grids 14, 15 disperse the arc in different directions, thereby reducing the energy generated by the arc. If the interrupting current is too large or the arc energy is high, the third arc-striking slots 17 can further reduce the remaining arc, achieving complete arc extinguishing.

[0035] Therefore, the utility model adopts the above-mentioned arc extinguishing structure of the circuit breaker, which has a simple and reasonable structure, is easy to maintain, and can achieve arc extinguishing in different areas and stages, with thorough arc extinguishing and good arc extinguishing effect.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An arc extinguishing structure for a circuit breaker, characterized in that: It includes a static contact plate, a moving contact and an arc extinguishing chamber, the arc extinguishing chamber is slidably arranged above the static contact plate, the arc extinguishing chamber includes a symmetrically arranged fixed plate and a top cover arranged on the fixed plate, and a plurality of first grid plates and second grid plates are staggered between the fixed plates below the top cover, the first grid plates are provided with a first arc-striking groove protruding upward, the second grid plates are provided with a second arc-striking groove protruding downward, and a plurality of third grid plates and fourth grid plates are obliquely arranged below the second grid plates with uniform intervals, and a static contact cooperating with the moving contact is provided on the static contact plate.

2. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: Slide blocks are provided on the inner side walls of the lower ends of the fixed plates, and sliding grooves corresponding to the slide blocks are provided on the outer walls of the static touch plates.

3. The arc extinguishing structure of a circuit breaker according to claim 2, characterized in that: The top cover is plugged into the fixing plate via a plug-in portion, and a plug-in hole corresponding to the plug-in portion is provided on the fixing plate.

4. The arc extinguishing structure of a circuit breaker according to claim 3, characterized in that: The first grid piece and the second grid piece are evenly spaced apart, and the first grid piece and the second grid piece have the same structure.

5. The arc extinguishing structure of a circuit breaker according to claim 4, characterized in that: A third arc-striking groove is horizontally arranged on the top cover, and the first arc-striking groove, the second arc-striking groove and the third arc-striking groove are all V-shaped.

6. The arc extinguishing structure of a circuit breaker according to claim 5, characterized in that: The third grid plate and the fourth grid plate have the same inclination angle and opposite inclination directions.

7. The arc extinguishing structure of a circuit breaker according to claim 6, characterized in that: An arc striking plate is provided at one end of the static contact, and a plurality of evenly spaced partition columns are provided on the arc striking plate. The cross-section of the partition columns is trapezoidal, and the end of the partition column away from the static contact is higher than the end close to the static contact.

8. The arc extinguishing structure of a circuit breaker according to claim 7, characterized in that: Magnetization parts are provided on both sides of the static contact, and the upper surfaces of the magnetization parts are slightly higher than the upper surface of the static contact.

Images