CN216450584U

CN216450584U - Arc extinguishing structure of miniature circuit breaker

Info

Publication number: CN216450584U
Application number: CN202123047002.0U
Authority: CN
Inventors: 李子琦; 陈勇; 吴昊; 邓明凯; 余炜垚
Original assignee: Zhejiang Tengen Electric Co Ltd
Current assignee: Zhejiang Tengen Electric Co Ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-05-06
Anticipated expiration: 2031-12-06

Abstract

The utility model provides an arc extinguishing structure of a miniature circuit breaker, which comprises an arc extinguishing chamber, and an arc striking angle and an arc discharge channel which are respectively arranged at the front side and the rear side of the arc extinguishing chamber, wherein the arc discharge channel comprises a first arc discharge channel and a second arc discharge channel which are separated by a partition plate, the first arc discharge channel and the second arc discharge channel are respectively arranged corresponding to the first arc extinguishing chamber and the second arc extinguishing chamber of the arc extinguishing chamber, and the boundary line of the first arc extinguishing chamber and the second arc extinguishing chamber is flush with the horizontal line at the lowest point of the arc striking angle. Therefore, the two arc discharge channels are not influenced mutually, arc channeling caused by different time when electric arcs enter the arc extinguish chamber can be effectively avoided, safety and reliability are improved, and service life is prolonged.

Description

Arc extinguishing structure of miniature circuit breaker

Technical Field

The utility model relates to the technical field of low-voltage electric appliances, in particular to an arc extinguishing structure of a miniature circuit breaker.

Background

The circuit breaker is an important control and protection device in a low-voltage distribution system, and can quickly cut off fault current when the distribution system has overload and short-circuit faults so as to protect the distribution system and electrical equipment.

The arc extinguishing structure of the existing miniature circuit breaker comprises an arc extinguishing chamber, an arc striking angle and an arc striking sheet which are arranged on the front side of the arc extinguishing chamber and arranged from top to bottom, and an arc discharge channel is arranged on the rear side of the arc extinguishing chamber. During short-circuit breaking test, due to the design of the bent angle of the static contact, when an electric arc moves to the position, a relatively long stagnation exists, so that the time that the electric arc (upper electric arc) close to an arc striking angle enters an arc extinguishing chamber relatively and later, the electric arc (lower electric arc) entering firstly is cooled and extinguished from the arc extinguishing chamber to generate high-temperature gas, one part of the high-temperature gas is discharged through an arc discharge port, the other part of the high-temperature gas flows upwards to enter the upper arc extinguishing chamber, and then arc channeling is caused, so that the electric arc entering the upper part of the arc extinguishing chamber through the arc striking angle has too long stagnation time in the arc extinguishing chamber to cause burning loss.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defect of burning loss caused by arc flashover of the circuit breaker in the prior art, thereby providing an arc extinguishing structure of a miniature circuit breaker with high safety and reliability and long service life.

Therefore, the utility model provides an arc extinguishing structure of a miniature circuit breaker, which comprises an arc extinguishing chamber, and an arc striking angle and an arc discharging channel which are respectively arranged at the front side and the rear side of the arc extinguishing chamber, wherein the arc discharging channel comprises a first arc discharging channel and a second arc discharging channel which are separated by a partition plate, the first arc discharging channel and the second arc discharging channel are respectively arranged corresponding to the first arc extinguishing chamber and the second arc extinguishing chamber of the arc extinguishing chamber, and the boundary line of the first arc extinguishing chamber and the second arc extinguishing chamber is flush with the horizontal line at the lowest point of the arc striking angle.

The shell is provided with a first row of arc ports which are arranged on the left side surface of the shell and communicated with the first row of arc channels, and a second row of arc ports which are arranged on the bottom surface of the shell and communicated with the second row of arc channels.

Still including locating the striking piece of explosion chamber front side, the striking piece has the neighbouring first arc portion of explosion chamber, and keep away from the explosion chamber, and the second arc portion that extends towards the moving contact direction, wherein, when separating the floodgate position, the tail end of moving contact is located the upper left side of second arc portion.

And the angle of a first included angle a between the second arc ignition part and the Y axis of the shell is 15-20 degrees.

The opening distance b between the moving contact and the static contact is 7.5-8 mm.

And an electrical gap c between the arc striking plate and the fixed contact is larger than the opening distance b.

The difference between the electric gap c and the opening distance b is 2-3 mm.

The static contact is characterized by further comprising two arc isolating plates which are arranged on two sides of the static contact respectively, and a magnetic conducting plate is arranged between each arc isolating plate and the corresponding shell.

The shell is provided with a positioning column, and the arc isolating plate and the magnetic conduction plate are respectively formed into a first through hole and a second through hole matched with the positioning column.

The moving contact is arranged on a contact support, the contact support is provided with a blocking surface which is arranged at the bottom of the contact support and is suitable for blocking the upward movement of the electric arc, and the blocking surface is an arc surface which is distributed by taking the rotating center of the contact support as the center of a circle.

The technical scheme of the utility model has the following advantages:

1. the arc discharge channel comprises a first arc discharge channel and a second arc discharge channel which are separated by a partition plate, the first arc discharge channel and the second arc discharge channel are respectively arranged corresponding to a first arc extinguish chamber and a second arc extinguish chamber of the arc extinguish chamber, and a boundary line of the first arc extinguish chamber and the second arc extinguish chamber is flush with a horizontal line at the lowest point of an arc striking angle, so that the two arc discharge channels are not influenced mutually, arc channeling caused by different time when electric arcs enter the arc extinguish chambers can be effectively avoided, the safety and reliability are improved, and the service life is prolonged.

2. According to the arc extinguishing structure of the miniature circuit breaker, the arc striking piece is provided with the first arc striking part close to the arc extinguishing chamber and the second arc striking part far away from the arc extinguishing chamber and extending towards the direction of the moving contact, wherein when the circuit breaker is in a brake separating position, the tail end of the moving contact is positioned above the left side of the second arc striking part, and the angle of the first included angle a between the second arc striking part and the Y axis of the shell is 15-20 degrees, so that the arc root is convenient to jump from the driven contact to the arc striking piece quickly, the arc striking piece moves to the arc extinguishing chamber along the first arc striking part which is arranged obliquely, and the arc striking effect is better.

3. According to the arc extinguishing structure of the miniature circuit breaker, the electric gap c between the arc striking plate and the fixed contact is larger than the opening distance b, and the difference value between the electric gap c and the opening distance b is 2-3mm, so that the arc striking plate is favorable for accelerating the movement of the electric arc from the arc striking plate to the arc extinguishing chamber, and the arc striking effect is further improved.

4. The utility model provides an arc extinguishing structure of a miniature circuit breaker, wherein a moving contact is arranged on a contact support, the contact support is provided with a blocking surface which is arranged at the bottom of the contact support and is suitable for blocking an electric arc from moving upwards, and the blocking surface is an arc surface which is distributed by taking the rotating center of the contact support as the center of a circle. In the breaking process, the electric arc is forced to move towards the lower arc runner and the arc extinguish chamber due to the blocking of the blocking surface to the electric arc, so that the stability of the movement direction of the electric arc is improved, and the extinguishing capability of the electric arc is improved; in addition, the first blocking surface is an arc surface distributed by taking the rotating center of the contact support as a circle center, so that the distance between the first blocking surface and the fixed contact is always kept unchanged when the contact support rotates, and the condition that partial electric arcs move to the upper mechanism due to the change of the distance is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a perspective view of a small circuit breaker of the present invention;

fig. 2 is a schematic structural view of an arc extinguishing structure of the miniature circuit breaker;

FIG. 3 is a schematic structural view of the housing;

fig. 4 is a perspective view of the arc striking plate, the magnetic conduction plate and the arc isolating plate.

Description of reference numerals: 1. an arc extinguishing chamber; 2. an arc striking angle; 3. an arc discharge channel; 4. a partition plate; 5. a first arc discharge passage; 6. a second row of arc channels; 7. a first arc-extinguishing chamber; 8. a second arc extinguishing chamber; 9. a housing; 10. an arc striking sheet; 11. a first arc discharge port; 12. a second row of arc openings; 13. a first arc striking part; 14. a second arc striking part; 15. a moving contact; 16. static contact; 17. an arc barrier; 18. a magnetic conductive plate; 19. a positioning column; 20. a contact support; 21. a blocking surface; 22. a resilient arm; 23. a limiting block; a. a first included angle; b. opening distance; c. an electrical gap.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Examples

This embodiment provides a miniature circuit breaker's arc extinguishing structure, locate including explosion chamber 1 and branch the striking structure and the row arc passageway 3 of both sides around the explosion chamber 1.

Arrange arc passageway 3, include first row arc passageway 5 and the second row arc passageway 6 that separates through baffle 4, first row arc passageway 5 and second row arc passageway 6 respectively with the first explosion chamber 7 of explosion chamber 1 and the corresponding setting of second explosion chamber 8, wherein, first explosion chamber 7 with the boundary line of second explosion chamber 8 with the minimum horizontal line of striking angle 2 flushes.

The arc striking structure is provided with an arc striking angle 2 and an arc striking sheet 10 which are arranged up and down, and two arc isolating plates 17 which are respectively arranged at two sides of a static contact 16, wherein a magnetic conduction plate 18 is arranged between the arc isolating plates 17 and a shell 9. As shown in fig. 2, the arc striking angle 2 is connected to a fixed contact 16, the arc striking plate 10 has a first arc striking portion 13 adjacent to the arc extinguishing chamber 1, and a second arc striking portion 14 far away from the arc extinguishing chamber 1 and extending toward the movable contact 15, wherein, in the opening position, the tail end of the movable contact 15 is located above and to the left of the second arc striking portion 14, an angle of a first included angle a between the second arc striking portion 14 and the Y axis of the housing 9 is 15 to 20 degrees, and a second included angle between the first arc striking portion 13 and the second arc striking portion 14 is an obtuse angle. In this embodiment, an opening distance b between the movable contact 15 and the fixed contact 16 is 7.5-8mm, an electrical gap c between the arc striking plate 10 and the fixed contact 16 is greater than the opening distance b, and a difference between the electrical gap c and the opening distance b is 2-3 mm. As shown in fig. 1 and 4, a limiting structure suitable for limiting the movement of the arc barrier 17 along the Z-axis direction of the housing 9 is arranged between the arc striking sheet 10 and the arc barrier 17, the limiting structure includes limiting blocks 23 respectively arranged on two sides of the arc striking sheet 10 in the width direction, and the two limiting blocks 23 extend to abut against the corresponding arc barrier 17.

The shell 9 is provided with a first row of arc ports 11 arranged on the left side surface of the shell and communicated with the first row of arc channels 5, and a second row of arc ports 12 arranged on the bottom surface of the shell and communicated with the second row of arc channels 6. Be equipped with reference column 19 on the casing 9, flash barrier 17 with magnetic conduction plate 18 respectively the shaping with first perforation and the second perforation of reference column 19 adaptation, reference column 19 have with first perforation inner wall elasticity counterbalance be two elastic arm 22 of relative setting.

The moving contact 15 is mounted on a contact support 20, the contact support 20 has a blocking surface 21 arranged at the bottom thereof and adapted to block the upward movement of the arc, and the blocking surface 21 is an arc surface distributed with the rotation center of the contact support 20 as the center of circle.

According to the arc extinguishing structure of the miniature circuit breaker, the arc discharge channel 3 comprises the first arc discharge channel 5 and the second arc discharge channel 6 which are separated through the partition plate 4, the first arc discharge channel 5 and the second arc discharge channel 6 are respectively arranged corresponding to the first arc extinguishing chamber 7 and the second arc extinguishing chamber 8 of the arc extinguishing chamber 1, wherein the boundary line of the first arc extinguishing chamber 7 and the second arc extinguishing chamber 8 is flush with the horizontal line at the lowest point of the arc striking angle 2, so that the two arc discharge channels are not influenced mutually, arc channeling caused by different time when electric arcs enter the arc extinguishing chambers 1 can be effectively avoided, safety and reliability are improved, and the service life is prolonged.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. The utility model provides a miniature circuit breaker's arc extinguishing structure, includes explosion chamber (1) and branch locates arc ignition angle (2) and row arc passageway (3) of both sides around explosion chamber (1), its characterized in that, row arc passageway (3) include through baffle (4) first row arc passageway (5) and second row arc passageway (6) separated, first row arc passageway (5) and second row arc passageway (6) respectively with first explosion chamber (7) and second explosion chamber (8) of explosion chamber (1) correspond the setting, wherein, first explosion chamber (7) with the boundary line of second explosion chamber (8) with the minimum horizontal line of arc ignition angle (2) flushes.

2. An arc extinguishing structure of a small circuit breaker according to claim 1, wherein the housing (9) has a first row of arc extinguishing ports (11) provided at a left side surface thereof and communicating with the first row of arc extinguishing passages (5), and a second row of arc extinguishing ports (12) provided at a bottom surface thereof and communicating with the second row of arc extinguishing passages (6).

3. The arc extinguishing structure of the miniature circuit breaker according to claim 1 or 2, further comprising an arc striking plate (10) disposed at the front side of the arc extinguishing chamber (1), wherein the arc striking plate (10) has a first arc striking portion (13) adjacent to the arc extinguishing chamber (1) and a second arc striking portion (14) far away from the arc extinguishing chamber (1) and extending toward the movable contact (15), and wherein, in the opening position, the tail end of the movable contact (15) is located at the upper left of the second arc striking portion (14).

4. An arc extinguishing structure of a small circuit breaker according to claim 3, characterized in that the angle of the first included angle a between the second arc-striking portion (14) and the Y-axis of the housing (9) is 15-20 degrees.

5. An arc extinguishing structure of a miniature circuit breaker according to claim 3, characterized in that the opening distance (b) between the moving contact (15) and the stationary contact (16) is 7.5-8 mm.

6. The arc extinguishing structure of a miniature circuit breaker according to claim 5, characterized in that the electrical gap (c) between said arc runner (10) and said stationary contact (16) is greater than said opening distance (b).

7. The arc extinguishing structure of the small circuit breaker according to claim 6, wherein the difference between the electrical gap (c) and the open distance (b) is 2-3 mm.

8. The arc extinguishing structure of the miniature circuit breaker according to claim 1, further comprising two arc barriers (17) respectively disposed at two sides of the stationary contact (16), wherein a magnetic conductive plate (18) is disposed between the arc barriers (17) and the housing (9).

9. The arc extinguishing structure of the miniature circuit breaker according to claim 8, wherein said housing (9) is provided with a positioning column (19), and said arc isolating plate (17) and said magnetic conductive plate (18) are respectively formed with a first through hole and a second through hole adapted to said positioning column (19).

10. An arc extinguishing structure of a miniature circuit breaker according to claim 3, characterized in that said movable contact (15) is mounted on a contact support (20), said contact support (20) has a blocking surface (21) arranged at the bottom thereof and adapted to block the upward movement of the arc, said blocking surface (21) is an arc surface distributed with the rotation center of said contact support (20) as the center of circle.