Arc extinguishing device of circuit breaker

Abstract

The utility model discloses an arc extinguishing device of a circuit breaker, which relates to the field of circuit breakers, and comprises a shell, a moving contact, a static contact, an arc striking sheet and an arc extinguishing chamber, and also comprises an arc isolating assembly wrapping the lower parts of the static contact and the moving contact, the arc isolating assembly is through up and down for arc to enter the arc extinguishing chamber, and the arc extinguishing chamber comprises an arc extinguishing cover, the shell is installed in the shell; the plurality of grid sheets are inserted on the inner walls of the two sides of the arc extinguishing chamber in a staggered manner; the arc extinguishing cover comprises a main body part located on the left side of the arc isolating assembly and an extension part located below the arc isolating assembly, and the end part of the extension part is close to the arc striking sheet. The arc extinguishing device has the advantage of good arc extinguishing effect.

Description

Technical Field

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

[0002] A circuit breaker is a mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry and disconnect current under abnormal circuit conditions within a specified time. When a fault current occurs in the circuit, the circuit breaker is disconnected and an arc is generated between the moving and static contacts. The arc needs to be completely disconnected and extinguished through a complete arc extinguishing system, so that the faulty equipment and lines are disconnected from the power grid, thereby protecting the equipment and lines.

[0003] At present, new energy systems are developing rapidly. In order to reduce costs and increase efficiency, increasing system voltage is the main way to improve efficiency and reduce costs for new energy related systems such as photovoltaics, energy storage, and charging piles; however, increasing the voltage will significantly increase the difficulty of arc breaking of circuit breakers, and the number of electrical life will also be significantly reduced; new energy related systems are generally low-voltage DC systems, and the arc will not automatically extinguish when passing through zero. 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 grids to force the DC current to pass through 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, and when the arc current is zero, the arc is completely disconnected and extinguished.

[0004] Existing circuit breakers generally have a small opening distance, a small number of arc extinguishing grids, and a poor overall arc-strike structure. When the DC system voltage is high and a current short circuit fault occurs, the arc between the moving and static contacts cannot be quickly led into the arc-extinguishing chamber to achieve the effect of cutting the arc and lengthening the arc, and finally cooling the arc and extinguishing the arc. Utility Model Content

[0005] In order to overcome the shortcomings of the background technology, the utility model provides an arc extinguishing device for a circuit breaker with good arc extinguishing effect.

[0006] The technical solution adopted by the utility model is: an arc extinguishing device of a circuit breaker, comprising a housing, a moving contact, a stationary contact, an arc-starting piece and an arc-extinguishing chamber, and also comprising an arc-isolating assembly wrapping the lower part of the stationary contact and the moving contact, the arc-isolating assembly penetrates the power supply arc from top to bottom into the arc-extinguishing chamber, and the arc-extinguishing chamber comprises:

[0007] An arc extinguishing hood mounted in the housing;

[0008] A plurality of grids are staggeredly inserted on the inner walls of both sides of the arc extinguishing hood;

[0009] The arc extinguishing cover comprises a main body portion located on the left side of the arc isolation assembly and an extension portion located below the arc isolation assembly, and an end of the extension portion is close to the arc striking piece.

[0010] The arc separation component includes an upper arc separation plate and a lower arc separation plate; a first positioning hole and a first positioning post are provided on the side wall of the upper arc separation plate; a second positioning hole adapted to and corresponding to the first positioning post and a second positioning post adapted to and corresponding to the first positioning hole are provided on the inner wall of one side of the housing.

[0011] An upper magnetic conduction plate is inserted into the upper arc separation plate, a lower magnetic conduction plate is inserted into the lower arc separation plate, and a magnetic conduction block is provided at the position of the housing corresponding to the static contact.

[0012] A baffle is installed on one side of the moving contact and a locking buckle is provided on the other side. A plurality of convex platforms are provided on the inner walls of both sides of the housing. The baffle, the locking buckle 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.

[0013] The number of the grid sheets is 21, and the distance between two adjacent grid sheets is 1 mm.

[0014] A plurality of partition plates arranged at intervals are provided at the position of the housing corresponding to the end of the arc extinguishing chamber.

[0015] The beneficial effect of the present utility model is that: in this technical solution, the arc extinguishing cover is set to a main body part located on the left side of the arc separation component and an extension part located below the arc separation component, which can accommodate a larger number of grid sheets. The more the number of grid sheets in the arc extinguishing cover, the more segments of the arc can be cut. The arc formed by the separation of the moving contact and the static contact moves quickly downward under the magnetic blowing action of the arc separation component, and then the arc guiding piece guides the arc to the arc extinguishing chamber. The grid sheets distributed in a staggered manner in the arc extinguishing cover make the distance of the arc longer, so that the arc voltage is quickly raised, and the arc is quickly cooled in the grid sheets of the arc extinguishing chamber, and the arc current begins to decrease. When the arc current is zero, the arc is completely disconnected and extinguished, having the advantage of good arc extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the arc extinguishing device of the circuit breaker according to the embodiment of the present utility model.

[0017] Figure 2 It is a schematic structural diagram of the arc extinguishing chamber and the arc separation component.

[0018] Figure 3 It is a schematic structural diagram of the arc extinguishing chamber.

[0019] Figure 4 It is a schematic structural diagram of the upper arc separation plate and the upper magnetic conduction plate.

[0020] Figure 5 It is a schematic structural diagram of the lower arc separation plate and the lower magnetic conduction plate.

[0021] Figure 6 It is a schematic structural diagram of one side of the housing.

[0022] Figure 7 It is a structural diagram of the moving contact. DETAILED DESCRIPTION

[0023] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0024] As shown in the figure, an arc extinguishing device of a circuit breaker includes a housing 1, a moving contact 2, a stationary contact 3, an arc-striking piece 4 and an arc-extinguishing chamber 5, and also includes an arc-isolating assembly wrapping the stationary contact 3 and the lower part of the moving contact 2, the arc-isolating assembly penetrates the power arc from top to bottom to enter the arc-extinguishing chamber 5, and the arc-extinguishing chamber 5 includes:

[0025] An arc extinguishing hood 51, which is installed in the housing 1;

[0026] A plurality of grid plates 52 are staggeredly inserted on the inner walls of both sides of the arc extinguishing cover 51;

[0027] The arc extinguishing hood 51 includes a main body 53 located on the left side of the arc isolation assembly and an extension 54 located below the arc isolation assembly, and the end of the extension 54 is close to the arc striking piece 4; the technical solution is to set the arc extinguishing hood as a main body located on the left side of the arc isolation assembly and an extension located below the arc isolation assembly, which can accommodate more grids. The more grids there are in the arc extinguishing hood, the more segments that can be cut. The arc formed by the moving contact and the static contact moving downward rapidly under the magnetic blowing of the arc isolation assembly, and then the arc striking piece leads the arc to the arc extinguishing chamber. The grids staggered in the arc extinguishing hood make the distance of the arc longer, so that the arc voltage is quickly raised, and the arc current begins to decrease in the grids of the arc extinguishing chamber. When the arc current is zero, the arc is completely disconnected and extinguished, which has the advantage of good arc extinguishing effect.

[0028] A baffle 21 is installed on one side of the moving contact 2 and a lock 22 is provided on the other side. A plurality of bosses 14 are provided on the inner walls on both sides of the shell 1. The baffle 21, the lock 22 and the boss 14 cooperate to form a blocking area, and the blocking area is located above the contact point between the moving contact 2 and the static contact 3. When the circuit breaker is disconnected, an arc is generated between the moving and static contacts. When an arc is generated, a large air pressure is generated. At this time, a blocking area is formed by the baffle and the lock connected to the moving contact and the boss on the inner wall of the shell, making it 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-starting sheet. When the moving and static contacts continue to open, due to the shielding and insulating effect of the baffle and the base boss, the arc cannot form a circuit at the upper part of the moving and static contacts.

[0029] The arc separating component includes an upper arc separating plate 61 and a lower arc separating plate 62; a first positioning hole 63 and a first positioning post 64 are provided on the side wall of the upper arc separating plate 61; a second positioning hole 11 adapted to and corresponding to the first positioning post 64 and a second positioning post 12 adapted to and corresponding to the first positioning hole 63 are provided on the inner wall of one side of the housing 1. The upper arc separating plate is precisely installed on the inner wall of one side of the housing through the first positioning hole and the first positioning post, and the lower arc separating plate is pressed by the static contact.

[0030] An upper magnetic conduction plate 65 is inserted into the upper arc separating plate 61, and a lower magnetic conduction plate 66 is inserted into the lower arc separating plate 62. A magnetic conduction block 13 is provided on the housing 1 at a position corresponding to the static contact 3. When the moving contact and the static contact are opened and the arc moves downward, due to the magnetic blowing effect of the L-shaped magnetic circuit formed by the upper magnetic conduction plate, the lower magnetic conduction plate and the magnetic conduction block on the arc, the arc moves downward rapidly; and with the compression of the upper arc separating plate and the lower arc separating plate, the arc continues to move downward rapidly under the action of air blowing and magnetic blowing.

[0031] The number of the grid sheets 52 is 21, and the distance between two adjacent grid sheets 52 is 1 mm; the more the number of grid sheets of the arc extinguishing cover, the more segments can be cut. When the distance between two grid sheets is 1 mm, the voltage between the grid sheets is about 25 V.

[0032] A plurality of partition plates 15 arranged at intervals are provided on the housing 1 at a position corresponding to the end of the arc extinguishing chamber 5; the end of the arc extinguishing chamber is the arc outlet of the arc extinguishing cover. The number of the partition plates is two. Three channels are formed by the inner walls of both sides of the housing and the partition plates. The arc at the arc outlet of the arc extinguishing cover is divided into three large segments by these three channels, which can ensure that the arc can be evenly discharged from the product.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and 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, and therefore cannot be understood 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.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" 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 components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0035] Attention to all technicians: Although the present utility model has been described according to the above specific embodiments, the inventive concept of the present utility model is not limited to this utility model alone. Any modification using the inventive concept of the present utility model will be included in the protection scope of the patent right of this patent.

Claims

1. An arc extinguishing device for a circuit breaker, comprising a housing (1), a moving contact (2), a static contact (3), an arc guiding piece (4) and an arc extinguishing chamber (5), characterized in that: It further includes an arc isolation component that wraps the lower positions of the static contact (3) and the moving contact (2), and the arc isolation component penetrates up and down to supply arcs into the arc extinguishing chamber (5). The arc extinguishing chamber (5) includes: An arc extinguishing cover (51) which is installed inside the housing (1); A plurality of grid plates (52) which are staggeredly inserted on the inner walls on both sides of the arc extinguishing cover (51); The arc extinguishing cover (51) includes a main body portion (53) located on the left side of the arc isolation component and an extension portion (54) located below the arc isolation component, and the end of the extension portion (54) is close to the arc ignition piece (4).

2. The arc extinguishing device of the circuit breaker according to claim 1, characterized in that: The arc isolation component includes an upper arc isolation plate (61) and a lower arc isolation plate (62); the side wall of the upper arc isolation plate (61) is provided with a first positioning hole (63) and a first positioning post (64); on one inner wall of the housing (1), there are a second positioning hole (11) adapted and corresponding to the first positioning post (64) and a second positioning post (12) adapted and corresponding to the first positioning hole (63).

3. The arc extinguishing device of the circuit breaker according to claim 2, characterized in that: An upper magnetic conductive plate (65) is inserted into the upper arc isolation plate (61), a lower magnetic conductive plate (66) is inserted into the lower arc isolation plate (62), and a magnetic conductive block (13) is provided at the position of the housing (1) corresponding to the static contact (3).

4. The arc extinguishing device of the circuit breaker according to claim 1, characterized in that: A baffle (21) is installed on one side of the moving contact (2) and a lock catch (22) is provided on the other side. A plurality of bosses (14) are provided on the inner walls on both sides of the housing (1). The baffle (21), the lock catch (22) and the bosses (14) 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).

5. The arc extinguishing device of the circuit breaker according to claim 1, characterized in that: The number of the grid plates (52) is 21, and the distance between two adjacent grid plates (52) is 1 mm.

6. The arc extinguishing device of the circuit breaker according to claim 1, characterized in that: A plurality of spaced partition plates (15) are provided at the position of the housing (1) corresponding to the end of the arc extinguishing chamber (5).

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