Arc extinguishing structure for high-voltage circuit breaker

Abstract

The utility model discloses an arc extinguishing structure for a high-voltage circuit breaker, which comprises a static contact, a moving contact and an arc extinguishing chamber, the static contact and the moving contact are both arranged beside the arc extinguishing chamber, and the arc extinguishing structure is characterized by further comprising an arc extinguishing enhancing structure; the arc extinguishing enhancing structure comprises a first arc striking part connected with the static contact, a grid plate increasing part installed in the arc extinguishing chamber, and a second arc striking part connected with the moving contact. Through the mode, the arc extinguishing structure for the high-voltage circuit breaker is provided with the arc extinguishing enhancing structure, the number of the arc extinguishing grid sheets is increased and the arc voltage is improved in a range of keeping the rotation of the original moving contact, so that the arc can be quickly extinguished.

Description

Technical Field

[0001] The utility model belongs to the electrical field, and in particular relates to an arc extinguishing structure for a high-voltage circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can connect, carry and disconnect current under normal circuit conditions, and can also carry and disconnect current under abnormal circuit conditions within a specified time. It is mainly used to connect or disconnect current in a circuit to ensure the safe operation of the circuit and equipment.

[0003] An existing arc extinguishing structure, such as a circuit breaker with authorization number CN216624182U, includes a static contact, a moving contact, a static contact arc-strike plate, and an arc-extinguishing chamber. The static contact arc-strike plate is connected to the static contact and extends to the bottom of the arc-extinguishing chamber. The static contact arc-strike plate and the static contact constitute a static conductor. The static contact arc-strike plate adopts a bent structure, and the arc conduction is slow. At the same time, the range passed by the moving end when the moving contact rotates is small. Considering the utilization rate of the arc-extinguishing grids, the number of arc-extinguishing grids that can be installed is small, resulting in poor arc extinguishing effect. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide an arc extinguishing structure for a high-voltage circuit breaker, which can improve the arc extinguishing speed.

[0005] In order to solve the above technical problems, the present invention adopts a technical solution: an arc extinguishing structure for a high-voltage circuit breaker, comprising a static contact, a movable contact and an arc extinguishing chamber, wherein the static contact and the movable contact are both arranged beside the arc extinguishing chamber, and further comprising an arc extinguishing enhancement structure;

[0006] The arc extinguishing enhancement structure includes a first arc striking portion connected to the static contact, a grid adding portion installed in the arc extinguishing chamber, and a second arc striking portion connected to the moving contact.

[0007] In a preferred embodiment of the present invention, the first arc-striking part includes a static contact arc-striking plate and a bracket, the static contact arc-striking plate is installed on the top of the bracket, the static contact is arranged between the static contact arc-striking plate and the bracket, and the static contact arc-striking plate is in a straight line shape.

[0008] In a preferred embodiment of the present invention, the grid addition portion includes a plurality of arc-extinguishing grids, and the plurality of arc-extinguishing grids are evenly arranged on the top of the arc-extinguishing chamber, and the static contact arc-starting plate is arranged in parallel on the left side close to the plurality of arc-extinguishing grids.

[0009] In a preferred embodiment of the present invention, the second arc-striking portion includes a moving contact arc-striking plate, which is arranged on the right side close to the arc-extinguishing grids, and the moving contact arc-striking plate is L-shaped.

[0010] In a preferred embodiment of the present invention, the length of the moving contact is increased so that the moving contact extends into the arc extinguishing chamber and is close to the bottom of a plurality of arc extinguishing grids.

[0011] In a preferred embodiment of the present invention, the bottom of the moving contact arc striking plate is close to the top of the moving contact.

[0012] The beneficial effects of the utility model are as follows: the utility model provides an arc extinguishing structure for a high-voltage circuit breaker, which has an arc extinguishing enhancement structure. While maintaining the original range of rotation of the moving contact, the number of arc extinguishing grids is increased, the arc voltage is improved, and thus it is conducive to the rapid extinction of the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The diagram is a structural diagram of an arc extinguishing structure for a high-voltage circuit breaker.

[0014] Figure 2 for Figure 1 Cross-sectional view during installation.

[0015] The components in the accompanying drawings are marked as follows: 1. bracket; 2. static contact; 3. static contact arc-starting plate; 4. moving contact; 5. moving contact arc-starting plate; 6. arc-extinguishing chamber; 7. arc-extinguishing grid; 8. fixing plate. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0017] See also Figure 1 and Figure 2 , the embodiments of the present utility model include:

[0018] An arc extinguishing structure for a high-voltage circuit breaker includes a static contact 2, a moving contact 4, and an arc extinguishing chamber 6. The static contact 2 and the moving contact 4 are both arranged adjacent to the arc extinguishing chamber 6. The structure also includes an arc extinguishing enhancement structure. While maintaining the original rotation range of the moving contact 4, the number of arc extinguishing grids 7 is increased to increase the arc voltage, thereby facilitating the rapid extinction of the arc.

[0019] The arc extinguishing enhancement structure includes a first arc striking portion connected to the static contact 2 , a grid adding portion installed in the arc extinguishing chamber 6 , and a second arc striking portion connected to the moving contact 4 .

[0020] The arc between the static contact arc striking plate 3 and the moving contact arc striking plate 5 moves upward under the action of the heat generated by the arc.

[0021] The first arc-striking part includes a static contact arc-striking plate 3 and a bracket 1, the static contact arc-striking plate 3 is installed on the top of the bracket 1, the static contact 2 is arranged between the static contact arc-striking plate 3 and the bracket 1, and the static contact 2 and the static contact arc-striking plate 3 are fixedly connected in the shell through the bracket 1.

[0022] The static contact arc striking plate 3 is in a straight line shape, so that the arc end at the static contact arc striking plate 3 moves faster, thereby increasing the arc extinguishing speed.

[0023] The static contact arc striking plate 3 is connected to the fixed plate 8 on the left side through the connecting section at the bottom. The fixed plate 8 firmly fixes the static contact arc striking plate 3 to the inner wall of the housing.

[0024] The added grid piece portion includes a plurality of arc-extinguishing grid pieces 7, and the plurality of arc-extinguishing grid pieces 7 are evenly arranged on the top of the arc-extinguishing chamber 6. By adding the moving contact arc-starting plate 5 and the moving contact arc-starting plate 5, the length of the arc is increased, so that the number of the original arc-extinguishing grid pieces 7 can be increased, and the arc voltage is increased, which is conducive to the rapid extinction of the arc.

[0025] The static contact arc striking plate 3 is arranged in parallel on the left side close to the arc extinguishing grids 7 .

[0026] The second arc-striking portion includes a moving contact arc-striking plate 5 , which is arranged on the right side close to the arc-extinguishing grids 7 , and is L-shaped.

[0027] The length of the moving contact 4 is increased so that it extends into the arc extinguishing chamber 6 close to the bottom of several arc extinguishing grids 7, so that when the current is small, the arc can pass through the arc extinguishing grids 7 located on the static contact arc striking plate 3 and the top of the moving contact 4.

[0028] The bottom of the moving contact arc-starting plate 5 is close to the top of the moving contact 4, so that when the current is large, the arc on the top of the moving contact 4 can be transferred to the moving contact arc-starting plate 5, thereby passing through all the arc-extinguishing grids 7. By adding the arc-extinguishing grids 7, the arc voltage is increased, which is conducive to the rapid extinction of the arc.

[0029] The static contact arc-striking plate 3 and the moving contact arc-striking plate 5 are both made of chromium-zirconium-copper material, which improves their rigidity and thus extends their service life.

[0030] Different from the prior art, the utility model provides an arc extinguishing structure for a high-voltage circuit breaker. The arc extinguishing structure has an arc extinguishing enhancement structure. While maintaining the original range of rotation of the moving contact, the number of arc extinguishing grids is increased, the arc voltage is increased, and thus it is conducive to the rapid extinction of the arc.

[0031] In the description of the present invention, it should be noted that the components are all universal standard parts or components known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or through conventional test methods. The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0032] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An arc extinguishing structure for a high-voltage circuit breaker, comprising a static contact, a movable contact, and an arc extinguishing chamber, wherein the static contact and the movable contact are both arranged adjacent to the arc extinguishing chamber, and characterized in that: Also included is an arc extinguishing enhancement structure; The arc extinguishing enhancement structure includes a first arc striking portion connected to the static contact, a grid adding portion installed in the arc extinguishing chamber, and a second arc striking portion connected to the moving contact; The first arc-striking part includes a static contact arc-striking plate and a bracket, the static contact arc-striking plate is installed on the top of the bracket, the static contact is arranged between the static contact arc-striking plate and the bracket, and the static contact arc-striking plate is in a straight line shape; The grid adding portion includes a plurality of arc extinguishing grids, the plurality of arc extinguishing grids are evenly arranged on the top of the arc extinguishing chamber, and the static contact arc striking plate is arranged in parallel on the left side close to the plurality of arc extinguishing grids; The second arc-striking portion includes a moving contact arc-striking plate, which is arranged on the right side close to the arc-extinguishing grids and is L-shaped; Increasing the length of the moving contact so that it extends into the arc extinguishing chamber and is close to the bottom of several arc extinguishing grids; The bottom of the moving contact arc striking plate is close to the top of the moving contact.

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