CN218215193U

CN218215193U - Arc extinguishing device of direct current circuit breaker

Info

Publication number: CN218215193U
Application number: CN202222641815.0U
Authority: CN
Inventors: 王�忠; 潘璇; 杜吟; 刘丰丰; 侯魁
Original assignee: Jiangsu Daquan Kaifan Switch Co ltd
Current assignee: Jiangsu Daquan Kaifan Switch Co ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-01-03
Anticipated expiration: 2032-10-09

Abstract

The utility model discloses a direct current breaker's arc extinguishing device, including arc extinguishing chamber subassembly, coil pack, moving contact, static contact, arc contact, front base, back base, each part is mutually supported, forms the current loop, and inductance coils produces magnetic field, and the magnetic field direction that produces between the magnetic conduction board is that the paper is outside or inside, and electric arc atress direction up, and electric arc can be stretched rapidly, gets into the explosion chamber fast, extinguishes until electric arc, promotes the arc extinguishing ability of circuit breaker jointly.

Description

Arc extinguishing device of direct current circuit breaker

Technical Field

The utility model relates to a direct current breaker field specifically is a direct current breaker's arc control device.

Background

At present, an existing direct current circuit breaker generally adopts an arc extinguishing chamber on one side of a moving contact and a static contact to extinguish arc, the arc extinguishing chamber is mainly structurally characterized in that transverse arc extinguishing grid pieces are composed of thin steel plates, all grid pieces are insulated from each other, gaps of an upper grid piece and a lower grid piece are staggered, and arc extinguishing grid pieces are arranged into V-shaped arc striking ends. When the moving contact is disconnected, the electric arc enters the grid plate and is divided into a plurality of short arcs, so that the arc extinguishing effect is achieved.

However, objectively, the arc blowing effect of the structure is not ideal, and mainly the arc enters the arc extinguishing chamber at a low speed, so that the arc extinguishing effect is poor and the sectioning capability is low. With the continuous rising of raw material cost, labor cost and financial cost, the price competition of low-voltage electric appliance products is still continuous, the overall profit growth rate of the low-voltage electric appliance industry is caused to be in a descending situation, an arc extinguishing system is a very important functional part of a low-voltage direct current circuit breaker, when fault current caused by overload and short circuit occurs in a circuit, a contact is disconnected to generate electric arc, and the arc extinguishing system plays a role in lengthening, breaking and extinguishing the generated electric arc.

Therefore, with the development of electric power, the operating voltage of the power system is increasing, the voltage of the low-voltage DC circuit breaker is up to DC 2000V, and especially, the arc extinguishing capability of the circuit breaker needs to be improved.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a direct current breaker's arc control device to solve above-mentioned problem.

In order to achieve the above purpose, the utility model is realized by the following technical scheme.

The utility model provides a direct current circuit breaker's arc control device, includes arc extinguishing chamber subassembly, coil pack, moving contact, static contact, arc contact, preceding base, back base, the arc extinguishing chamber subassembly is located whole top position, preceding base and back pedestal connection, the coil pack is embedded in preceding base and back base, including wire, inductance coil, iron core, magnetic conduction board, the coil pack outside still is equipped with insulating housing, and keeps apart with both moving contact, static contact, also keeps apart with electric arc simultaneously, the moving contact sets up the base side in the front, the static contact sets up the base side in the back, the arc contact sets up in the static contact top.

Preferably, an arc extinguishing grid plate and an arc striking plate are arranged in the arc extinguishing chamber assembly and used for dividing and cooling the electric arc.

Preferably, the arc extinguishing grid pieces are provided with a plurality of arc striking pieces, and the arc striking pieces are located on the side faces of the arc extinguishing grid pieces.

Preferably, the fixed contact extends to form a fixed contact connecting bar.

Preferably, the movable contact extends to form a movable contact connecting row.

Preferably, the number of the wires is two.

Preferably, one of the wires is connected with one end of the inductance coil and the static contact connecting bar respectively.

Preferably, the other one of the leads is connected with the other end of the inductance coil and the arc contact respectively.

Preferably, the iron core is arranged inside the inductance coil, two ends of the iron core are respectively connected with the magnetic conduction plate, and when the inductance coil passes through current, a magnetic field is generated, namely, the right-hand spiral rule. The iron core and the magnetic conduction plates are combined, and are equivalent to a horseshoe-shaped magnet under the action of the magnetic field of the inductance coil, and a magnetic field is generated between the magnetic conduction plates.

Preferably, an insulator is arranged between the arc contact and the static contact connecting row, so that the arc contact and the static contact are not in direct contact.

Compared with the prior art, the utility model discloses an arc extinguishing device of a direct current breaker, which comprises an arc extinguishing chamber component, a coil component, a moving contact, a static contact, an arc contact, a front base and a rear base,

the current flows out through the static contact connecting row → the inductance coil → the arc contact → the moving contact connecting row to form a current loop, the inductance coil generates a magnetic field, the direction of the magnetic field generated between the magnetic conductive plates is outward of the paper surface, the left-hand rule shows that the stress direction of the electric arc is upward, and the electric arc can be rapidly stretched and rapidly enters the arc extinguish chamber until the electric arc is extinguished;

meanwhile, the current flows out through the moving contact connecting row → the moving contact → the arc contact → the inductance coil → the static contact connecting row to form a current loop, the inductance coil generates a magnetic field, and the direction of the magnetic field generated between the magnetic conductive plates is inward of the paper surface. Can know through the left-hand rule, electric arc atress direction still up, and electric arc can be stretched rapidly, gets into the explosion chamber fast and extinguishes, and each part is mutually supported, promotes the arc extinguishing ability of circuit breaker jointly.

Drawings

Fig. 1 is a cross-sectional view of an arc extinguishing device of the dc circuit breaker of the present invention;

fig. 2 is a schematic structural view of an arc extinguishing device of the dc circuit breaker of the present invention;

fig. 3 is a schematic structural view of an arc extinguishing device of the dc circuit breaker according to the present invention;

fig. 4 is a schematic diagram of the coil assembly of the present invention and a schematic diagram of the coil magnetic field;

fig. 5 is a schematic view of the coil assembly and a coil magnetic field;

fig. 6 is a schematic view of an arc magnetic field in an arc extinguishing device of the dc circuit breaker according to the present invention;

fig. 7 is a schematic view of an arc magnetic field in the arc extinguishing device of the dc circuit breaker of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

The utility model provides an arc extinguishing device of direct current circuit breaker, includes arc extinguish chamber subassembly 1, coil pack 2, moving contact 3, static contact 4, arc contact 5, front base 6, back base 7, arc extinguish chamber subassembly 1 is located whole top position, front base 6 is connected with back base 7, coil pack 2 is embedded in front base 6 and back base 7, including wire 21, inductance coil 22, iron core 23, magnetic conduction board 24, coil pack 2 outside still is equipped with insulating housing, and keeps apart with moving contact 3, static contact 4 both, also keeps apart with electric arc simultaneously, moving contact 3 sets up in front base 6 side, static contact 4 sets up in back base 7 side, arc contact 5 sets up in the 4 tops of static contact. Arc extinguishing bars piece, striking piece are equipped with in the explosion chamber subassembly 1 for cut apart and cool off electric arc, arc extinguishing bars piece is equipped with a plurality of, the striking piece is located arc extinguishing bars piece side. The fixed contact 4 is extended with a fixed contact connecting row 41. The movable contact 3 is extended with a movable contact connecting bar 31. The number of the lead wires 21 is two. One of the wires 21 is connected to one end of the inductor 22 and the stationary contact connecting bar 41. The other of the wires 21 is connected to the other end of the inductor 22 and the arcing contact 5, respectively. The iron core 23 is arranged inside the inductance coil 22, two ends of the iron core 23 are respectively connected with the magnetic conductive plates 24, and when the inductance coil 22 passes through current, a magnetic field is generated, namely, a right-hand spiral rule is determined. The iron core 23 and the magnetic conductive plates 24 are combined, and under the action of the magnetic field of the inductance coil 22, a magnetic field is generated between the magnetic conductive plates 24, which is equivalent to a horseshoe-shaped magnet. An insulator is arranged between the arc contact 5 and the fixed contact connecting row 41.

As shown in fig. 6, the current enters from the fixed contact connecting bar 41 and the movable contact connecting bar 31 exits. When the breaker is opened, an electric arc is generated between the movable contact 3 and the arc contact 5. At the same time, the current flows out through the stationary contact connection row 41 → the inductor coil 22 → the arcing contact 5 → the movable contact 3 → the movable contact connection row 31, forming a current loop. The inductor coil 22 generates a magnetic field, and the direction of the magnetic field generated between the magnetic conductive plates 24 is out of the paper. Can know through the left-hand rule that electric arc atress direction is up, and electric arc can be stretched rapidly, gets into explosion chamber subassembly 1 fast, and is extinguished until electric arc.

As shown in fig. 7, the current enters from the moving contact connecting row 31 and the stationary contact connecting row 41 exits, in the opposite direction to the current in fig. 6. When the breaker is opened, an electric arc is generated between the movable contact 3 and the arc contact 5. At the same time, the current flows out through the movable contact connecting row 31 → the movable contact 3 → the arcing contact 5 → the inductance coil 22 → the stationary contact connecting row 41, forming a current loop. The inductor coil 22 generates a magnetic field, and the direction of the magnetic field generated between the magnetic conductive plates 24 is inward of the paper. According to the left-hand rule, the stress direction of the electric arc is still upward, the electric arc can be rapidly stretched, the electric arc enters the arc extinguish chamber assembly 1 rapidly and is extinguished, and the arc extinguishing capacity of the circuit breaker is improved.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides an arc control device of direct current circuit breaker which characterized in that: including explosion chamber subassembly (1), coil pack (2), moving contact (3), static contact (4), arc contact (5), preceding base (6), rear base (7), explosion chamber subassembly (1) is located whole top position, preceding base (6) are connected with rear base (7), coil pack (2) are embedded in preceding base (6) and rear base (7), including wire (21), inductance coils (22), iron core (23), magnetic conduction board (24), coil pack (2) outside still is equipped with insulating housing, and keeps apart with moving contact (3), static contact (4) both, moving contact (3) set up in preceding base (6) side, static contact (4) set up in rear base (7) side, arc contact (5) set up in static contact (4) top.

2. The arc extinguishing apparatus of the direct current circuit breaker according to claim 1, wherein: arc extinguishing bars and arc striking plates are arranged in the arc extinguishing chamber component (1).

3. The arc extinguishing apparatus of the dc circuit breaker according to claim 2, wherein: the arc extinguishing bars are provided with a plurality of arc extinguishing bars, and the arc striking plates are positioned on the side faces of the arc extinguishing bars.

4. The arc extinguishing apparatus of the direct current circuit breaker according to claim 1, wherein: and the static contact (4) is provided with a static contact connecting bar (41) in an extending way.

5. The arc extinguishing apparatus of the direct current circuit breaker according to claim 4, wherein: the moving contact (3) is provided with a moving contact connecting bar (31) in an extending way.

6. The arc extinguishing apparatus of the direct current circuit breaker according to claim 5, wherein: the number of the conducting wires (21) is two.

7. The arc extinguishing apparatus of the dc circuit breaker according to claim 6, wherein: one of the leads (21) is connected with one end of the inductance coil (22) and the static contact connecting bar (41) respectively.

8. The arc extinguishing apparatus of the dc circuit breaker according to claim 6, wherein: the other one of the leads (21) is respectively connected with the other end of the inductance coil (22) and the arc contact (5).

9. The arc extinguishing apparatus of the direct current circuit breaker according to claim 1, wherein: the iron core (23) is arranged inside the inductance coil (22), and two ends of the iron core (23) are respectively connected with the magnetic conduction plate (24).

10. The arc extinguishing apparatus of the direct current circuit breaker according to claim 4, wherein: and an insulator is arranged between the arc contact (5) and the static contact connecting row (41).