Arc extinguishing system of circuit breaker

Abstract

The utility model discloses an arc extinguishing system of a circuit breaker, which relates to the field of circuit breakers, solves the problem that high-voltage fault current arc is difficult to break in the existing new energy direct current system, and comprises a shell, a moving contact, a static contact and an arc extinguishing chamber, a baffle plate is arranged on one side of the moving contact, and a lock catch is arranged on the other side of the moving contact; a plurality of bosses are arranged on the inner walls of the two sides of the shell, the baffles, the lock catches and the bosses are matched to form a blocking area, and the blocking area is located above the contact point of the moving contact and the static contact. The arc striking device has the advantage of good arc striking effect.

Description

Technical Field

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

[0002] A circuit breaker is a mechanical switching device that can connect, carry, and break the current under normal circuit conditions, and can also connect, carry, and break the current under abnormal circuit conditions within a specified time. When a fault current occurs in the circuit, the circuit breaker disconnects, and an arc will be generated between the moving contact and the static contact. The entire arc extinguishing system is required to completely break and extinguish the arc, disconnecting the faulty equipment and lines from the power grid to achieve the protection of the equipment and lines.

[0003] At present, the new energy system is developing rapidly. In order to reduce costs and increase efficiency, increasing the system voltage is the main way to improve the efficiency and reduce the cost of new energy-related systems such as photovoltaic, energy storage, and charging piles. However, increasing the voltage will significantly increase the difficulty of arc breaking of the circuit breaker, and the electrical life times will also be significantly reduced. New energy-related systems are generally low-voltage DC systems, and the arc will not automatically extinguish at the zero crossing. When breaking, it is necessary to increase the arc voltage by lengthening the arc, cooling the arc, compressing the arc, and cutting the arc with metal grid plates to force the DC current to cross zero. When the arc voltage is greater than the power supply voltage on both sides of the circuit breaker, the arc current begins to decrease. When the arc current is zero, the arc is completely broken and extinguished.

[0004] The existing circuit breakers generally have a small opening distance. When the DC system voltage is high and a current short-circuit fault occurs, the arc between the moving contact and the static contact cannot be quickly led into the arc extinguishing chamber. Summary of the Utility Model

[0005] In order to overcome the deficiencies of the background art, the utility model provides an arc extinguishing system of a circuit breaker with good arc leading effect.

[0006] The technical solution adopted by the utility model: an arc extinguishing system of a circuit breaker, including a housing, a moving contact, a static contact, and an arc extinguishing chamber. A baffle is installed on one side of the moving contact, and a lock catch is provided on the other side. Several convex platforms are provided on the inner walls of both sides of the housing. The baffle, the lock catch, and the convex platforms cooperate to form a sealing area, and the position of the sealing area is above the contact point of the moving contact and the static contact.

[0007] An arc isolation component that clamps the lower positions of the moving contact and the static contact is further provided in the housing. The arc isolation component includes an upper arc isolation plate and a lower arc isolation plate that are connected to each other.

[0008] An upper magnetic conductive plate is inserted into the upper arc isolation plate, a lower magnetic conductive plate is inserted into the lower arc isolation plate, and a magnetic conductive block is provided at the position of the housing corresponding to the static contact.

[0009] The cross-sections of the upper arc separating plate and the lower arc separating plate are both U-shaped.

[0010] A stopper extending in the thickness direction is provided at the lower right corner of the lower arc separating plate, and a support plate extending in the thickness direction is provided at the lower right corner of the lower magnetic conduction plate.

[0011] A positioning block is provided on the outer side wall of the stopper, and a positioning groove corresponding to and adapted to the positioning block is provided on the support plate.

[0012] The beneficial effects of the present utility model are as follows: When a fault current occurs in the circuit, the circuit breaker disconnects, and an arc is generated between the moving and static contacts. When the arc is generated, a large air pressure will be generated. At this time, since the baffle and the lock connected to the moving contact form a sealing area with the convex platform on the inner wall of the housing, it is very difficult for the gas generated by the arc to move upward. Under the action of the air pressure, the arc can only move downward and is quickly introduced into the arc extinguishing chamber by the arc guiding piece; and when the moving and static contacts continue to open, due to the shielding and insulating effect of the baffle and the base convex platform, the arc cannot form a loop above the moving and static contacts, having the advantage of good arc guiding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the arc extinguishing system of the circuit breaker according to the embodiment of the present utility model.

[0014] Figure 2 It is a cross-sectional view of the arc extinguishing system of the circuit breaker.

[0015] Figure 3 It is a schematic structural diagram of the lower arc separating plate and the lower magnetic conduction plate.

[0016] Figure 4 It is a schematic structural diagram of the lower magnetic conduction plate.

[0017] Figure 5 It is a schematic structural diagram of the moving contact.

[0018] Figure 6 It is a schematic structural diagram of the arc separating assembly.

[0019] Figure 7 It is a schematic three-dimensional structural diagram of the arc extinguishing system of the circuit breaker. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following further describes the embodiments of the present utility model with reference to the drawings:

[0021] As shown in the figure, an arc extinguishing system of a circuit breaker includes a housing 1, a moving contact 2, a static contact 3, and an arc extinguishing chamber 4. A baffle 5 is installed on one side of the moving contact 2, and a locking buckle 6 is provided on the other side. A plurality of bosses 11 are provided on the inner walls of both sides of the housing 1. The baffle 5, the locking buckle 6, and the bosses 11 cooperate to form a blocking area, and the position of this blocking area is above the contact point of the moving contact 2 and the static contact 3. In the technical solution, when a fault current occurs in the circuit, the circuit breaker disconnects, and an arc is generated between the moving and static contacts. When the arc is generated, a large air pressure will be generated. At this time, since the baffle and the locking buckle connected to the moving contact form a blocking area with the bosses on the inner wall of the housing, it is difficult for the gas generated by the arc to move upward. Under the action of the air pressure, the arc can only move downward and is quickly introduced into the arc extinguishing chamber by the arc guiding piece. And when the moving and static contacts continue to open, due to the shielding and insulating effect of the baffle and the base bosses, the arc cannot form a loop above the moving and static contacts, which has the advantage of good arc guiding effect.

[0022] An arc separating assembly that clamps the lower positions of the moving contact 2 and the static contact 3 is further provided in the housing 1. The arc separating assembly includes an upper arc separating plate 7 and a lower arc separating plate 8 that are connected to each other. An upper magnetic conductive plate 9 is inserted into the upper arc separating plate 7, a lower magnetic conductive plate 10 is inserted into the lower arc separating plate 8, and a magnetic conductive block 12 is provided at the position of the housing 1 corresponding to the static contact 3. When the arc moves downward, due to the magnetic blowing effect of the closed magnetic circuit formed by the upper magnetic conductive plate, the lower magnetic conductive plate, and the magnetic conductive block on the arc, the arc moves downward quickly. And due to the compression of the upper arc separating plate and the lower arc separating plate, the arc continues to move downward quickly under the action of air blowing and magnetic blowing.

[0023] Among them, Figure 1 and Figure 7 the upper arc separating plate 7 and the upper magnetic conductive plate are not shown. The structural schematic diagrams of the upper arc separating plate 7 and the lower arc separating plate 8 can be referred to Figure 6 .

[0024] The cross-sections of the upper arc separating plate 7 and the lower arc separating plate 8 are both U-shaped. The installation structures of the upper magnetic conductive plate and the upper arc separating plate, and the lower magnetic conductive plate and the lower arc separating plate are all plug-in structures, which have the advantages of convenient installation and simple structure.

[0025] A block 81 extending along the thickness direction is provided at the lower right corner position of the lower arc separating plate 8, and a support plate 101 extending along the thickness direction is provided at the lower right corner position of the lower magnetic conductive plate 10. As Figure 3 and 6 shown, the block 81 and the support plate 101 are located at the lower right corner position. The arc moves downward quickly under the action of air blowing and magnetic blowing. The support plate is inclined, and the support plate will also provide a magnetic blowing effect to change the direction of the arc and lead it to the arc extinguishing chamber.

[0026] A positioning block 82 is provided on the outer side wall of the stopper 81, and a positioning groove 102 corresponding to and adapted to the positioning block 82 is provided on the support plate 101, which facilitates installation.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection" and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0029] All technicians should note that although the present invention has been described according to the above specific embodiments, the inventive concept of the present invention is not limited to this invention only. Any modification using the inventive concept of the present invention will be included in the scope of protection of the patent right of this patent.

Claims

1. An arc extinguishing system for a circuit breaker, comprising a housing (1), a moving contact (2), a static contact (3) and an arc extinguishing chamber (4), characterized in that: One side of the moving contact (2) is provided with a baffle (5) and the other side is provided with a locking buckle (6). A plurality of bosses (11) are provided on the inner walls of both sides of the housing (1). The baffle (5), the locking buckle (6) and the bosses (11) cooperate to form a sealing area, and the position of the sealing area is above the contact point of the moving contact (2) and the static contact (3).

2. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that: An arc isolation component that clamps the lower positions of the moving contact (2) and the static contact (3) is further provided in the housing (1). The arc isolation component includes an upper arc isolation plate (7) and a lower arc isolation plate (8) that are connected to each other.

3. The arc extinguishing system of the circuit breaker according to claim 2, characterized in that: An upper magnetic conduction plate (9) is inserted into the upper arc isolation plate (7), a lower magnetic conduction plate (10) is inserted into the lower arc isolation plate (8), and a magnetic conduction block (12) is provided at the position of the housing (1) corresponding to the static contact (3).

4. The arc extinguishing system of the circuit breaker according to claim 3, characterized in that: The cross-sections of the upper arc isolation plate (7) and the lower arc isolation plate (8) are both U-shaped.

5. The arc extinguishing system of the circuit breaker according to claim 3, characterized in that: A stop block (81) extending in the thickness direction is provided at the lower right corner position of the lower arc isolation plate (8), and a support plate (101) extending in the thickness direction is provided at the lower right corner position of the lower magnetic conduction plate (10).

6. The arc extinguishing system of the circuit breaker according to claim 5, characterized in that: A positioning block (82) is provided on the outer side wall of the stop block (81), and a positioning groove (102) corresponding to and adapted to the positioning block (82) is provided on the support plate (101).

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