Arc striking structure of circuit breaker

Abstract

An arc striking structure of a circuit breaker comprises a moving contact and a static contact, electric arcs generated by breaking of the moving contact and the static contact can be discharged after being extinguished through an arc extinguish chamber, the arc extinguish chamber comprises a first arc extinguish grid plate group, a second arc extinguish grid plate group and a third arc extinguish grid plate group, the second arc extinguish grid plate group is located at the moving contact end in the arc extinguish chamber, and the third arc extinguish grid plate group is located at the moving contact end in the arc extinguish chamber. The third arc extinguishing grid plate group is located at the static contact end in the arc extinguishing chamber, the first arc extinguishing grid plate group is located in the arc extinguishing chamber and located between the second arc extinguishing grid plate group and the third arc extinguishing grid plate group, and the first arc extinguishing grid plate group comprises a first run-on plate located below the opening area of the moving contact. The first arc extinguishing grid sheet group is connected with the second arc extinguishing grid sheet group through the second end tab, and the first arc extinguishing grid sheet group is connected with the third arc extinguishing grid sheet group through the third end tab. According to the circuit breaker, the arc striking structures are arranged on the full path of the breaking of the moving contact and the static contact, the arc striking structures at different stages in the breaking process are used for bearing the arc, the whole arc is divided into multiple sections of arcs through the arc striking structures, the newly generated arc can be rapidly cut and extinguished by the corresponding arc extinguishing grid pieces, and therefore the breaking performance of the circuit breaker is improved.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to an arc-starting structure for a circuit breaker. Background Technology

[0002] Circuit breakers are an important component of power distribution equipment, mainly used in various power systems to connect and disconnect current in power grid circuits and protect lines and power equipment from faults such as overload, undervoltage, short circuit, and single-phase grounding. When a fault current occurs, the circuit breaker controller issues a trip command, causing the tripping mechanism to operate, which in turn opens the contacts. After the contacts open, an electric arc is generated. Under the influence of a magnetic field and fluid, the arc enters the arc-extinguishing chamber. The arc-extinguishing chamber uses multiple arc-extinguishing grid plates to divide the arc into multiple short arc segments, increasing the arc voltage to quickly extinguish the arc and ensure the normal operation of the circuit breaker.

[0003] Currently, the arc-initiating structures used in circuit breakers mostly involve setting moving arc-initiating plates and stationary arc-initiating plates at the moving and stationary busbars, respectively. If the arc-extinguishing chamber is long, the arc moves slowly and the arc-extinguishing time is long. The arc remains inside the conduction and arc-extinguishing system for a long time, which can lead to abnormal problems such as blackening, melting, or even burn-through of the arc-extinguishing chamber and the circuit breaker casing, posing safety hazards during use. Especially in arc-extinguishing chambers with lower-positioned arc-extinguishing grids, due to weaker air blowing, the arc column cannot be cut by the arc-extinguishing grids, and the arc root is difficult to transfer, which increases the difficulty of extinguishing the arc, reduces the arc-extinguishing performance of the arc-extinguishing chamber, and makes it difficult for the circuit breaker to meet the breaking performance standards. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing arc-extinguishing chambers with lower-positioned arc-extinguishing grids, where the arc root is difficult to transfer, leading to increased difficulty in extinguishing the arc, reduced arc-extinguishing performance of the arc-extinguishing chamber, and difficulty in meeting the breaking performance of the circuit breaker. This invention provides an arc-initiating structure for a circuit breaker. By setting an arc-initiating structure along the entire path of the moving and stationary contacts, the arc can be quickly cut and extinguished by the corresponding arc-extinguishing grids, thereby improving the breaking performance of the circuit breaker.

[0005] Technical solution

[0006] To achieve the above-mentioned technical objectives, this utility model provides an arc-initiating structure for a circuit breaker, comprising a moving contact and a stationary contact. The arc generated by the breaking of the moving and stationary contacts can be extinguished and discharged through an arc-extinguishing chamber. The arc-extinguishing chamber comprises an arc-extinguishing grid assembly one, an arc-extinguishing grid assembly two, and an arc-extinguishing grid assembly three. The arc-extinguishing grid assembly two is located at the moving contact end within the arc-extinguishing chamber, and the arc-extinguishing grid assembly three is located at the stationary contact end within the arc-extinguishing chamber. The arc-extinguishing grid assembly one is located within the arc-extinguishing chamber between the arc-extinguishing grid assembly two and the arc-extinguishing grid assembly three. The arc-extinguishing grid assembly one includes an arc-initiating plate one located below the opening area of ​​the moving contact. The arc-extinguishing grid assembly one is connected to the arc-extinguishing grid assembly two via the arc-initiating plate two, and the arc-extinguishing grid assembly one is connected to the arc-extinguishing grid assembly three via the arc-initiating plate three. The arc-extinguishing grid assembly one is inclined towards the moving contact side.

[0007] In one embodiment, the arc-extinguishing grid plate one in the arc-extinguishing grid plate group one has a notch facing the moving contact, and the notch after the several arc-extinguishing grid plates one are arranged together forms a channel for the moving contact to run.

[0008] In one embodiment, the arc-initiating plate is a U-shaped arc-initiating plate, and a plurality of arc-extinguishing grid plates are arranged on both sides of the U-shaped arc-initiating plate. The plurality of arc-extinguishing grid plates are parallel to the two side walls of the U-shaped arc-initiating plate, and the opening of the U-shaped arc-initiating plate is away from the moving contact.

[0009] In one embodiment, the second arc-extinguishing grid assembly includes a plurality of parallel arc-extinguishing grids, which are horizontally placed and spaced apart along the vertical direction.

[0010] The arc-extinguishing grid assembly includes several arc-extinguishing grids arranged in parallel, and the several arc-extinguishing grids are placed horizontally and spaced apart along the vertical direction.

[0011] In one embodiment, one end of the second arc-initiating plate is parallel to one side of the first arc-extinguishing grid assembly near the moving contact, and the other end of the second arc-initiating plate is located at the bottom of the second arc-extinguishing grid assembly and is parallel to the second arc-extinguishing grid assembly.

[0012] In one embodiment, one end of the arc-initiating plate three is parallel to one side of the arc-extinguishing grid assembly three near the stationary contact, and the other end of the arc-initiating plate three is located at the bottom of the arc-extinguishing grid assembly three and parallel to the plurality of arc-extinguishing grids three.

[0013] In one embodiment, a stationary arc-running plate is further included. One end of the stationary arc-running plate is connected to the stationary contact, and the other end is located at the top of the arc-extinguishing grid plate group three and parallel to the plurality of arc-extinguishing grid plates three. A bending portion is provided between the two ends of the stationary arc-running plate. The arc-inducing plate three is located in the area below the bending portion, and the bottom of the U-shaped bend on the arc-inducing plate three corresponds to the bending portion.

[0014] In one embodiment, a moving-end arc-running plate is also included, which is located at the top of the second arc-extinguishing grid plate group, and the second arc-inducing plate is located below the moving-end arc-running plate.

[0015] In one embodiment, the first arc-extinguishing grid assembly is located below the area where the moving contact is open, and the maximum open position of the moving contact is located at the arc inlet in front of the second arc-extinguishing grid assembly.

[0016] In one embodiment, an operating mechanism is also included, wherein the operating mechanism, the moving contact, and the arc-extinguishing chamber are arranged sequentially from top to bottom, and the moving contact and the stationary contact are arranged horizontally. Beneficial effects

[0017] This utility model provides an arc-starting structure for a circuit breaker, comprising a moving contact and a stationary contact. The arc generated by the breaking of the moving and stationary contacts can be extinguished and discharged through an arc-extinguishing chamber. The arc-extinguishing chamber includes an arc-extinguishing grid plate group one, an arc-extinguishing grid plate group two, and an arc-extinguishing grid plate group three. The arc-extinguishing grid plate group two is located at the moving contact end within the arc-extinguishing chamber, and the arc-extinguishing grid plate group three is located at the stationary contact end within the arc-extinguishing chamber. The arc-extinguishing grid plate group one is located within the arc-extinguishing chamber between the arc-extinguishing grid plate groups two and three. The arc-extinguishing grid plate group one includes an arc-starting plate one located below the opening area of ​​the moving contact. The arc-extinguishing grid plate group one is connected to the arc-extinguishing grid plate group two through the arc-starting plate two, and the arc-extinguishing grid plate group one is connected to the arc-extinguishing grid plate group three through the arc-starting plate three. The arc-extinguishing grid plate group one is inclined towards the moving contact side. By setting an arc-initiating structure along the entire path of the moving and stationary contacts, and using the arc-initiating structure at different stages of the breaking process to receive the arc, a whole arc is divided into multiple arc segments by the arc-initiating structure. Newly generated arcs can be quickly cut and extinguished by the corresponding arc-extinguishing grids, thereby improving the breaking performance of the circuit breaker. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Appendix Figure 1 This is a schematic diagram of the closing state of the moving contact and the stationary contact in an embodiment of this utility model;

[0020] Appendix Figure 2 This is a schematic diagram of the state when the moving contact and the stationary contact are separated in an embodiment of this utility model;

[0021] Appendix Figure 3This is a schematic diagram of the state when the moving contact and the stationary contact are separated to their maximum positions in an embodiment of this utility model;

[0022] Appendix Figure 4 This is a schematic diagram of the arc movement when the moving contact and the stationary contact are separated in an embodiment of this utility model;

[0023] Appendix Figure 5 This is a schematic diagram of the arc movement when the moving contact and the stationary contact are separated to their maximum positions in an embodiment of this utility model; Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. Example

[0029] Currently, the arc-initiating structures used in circuit breakers mostly involve setting moving arc-initiating plates and stationary arc-initiating plates at the moving and stationary busbars, respectively. If the arc-extinguishing chamber is long, the arc moves slowly and the arc-extinguishing time is long. The arc remains inside the conduction and arc-extinguishing system for a long time, which can lead to abnormal problems such as blackening, melting, or even burn-through of the arc-extinguishing chamber and the circuit breaker casing, posing safety hazards during use. Especially in arc-extinguishing chambers with lower-positioned arc-extinguishing grids, due to weaker air blowing, the arc column cannot be cut by the arc-extinguishing grids, and the arc root is difficult to transfer, which increases the difficulty of extinguishing the arc, reduces the arc-extinguishing performance of the arc-extinguishing chamber, and makes it difficult for the circuit breaker to meet the breaking performance standards.

[0030] To solve this problem, see attached... Figure 4 and 5As shown in the figure, this embodiment provides an arc-starting structure for a circuit breaker. The circuit breaker includes an operating mechanism (not shown in the figure). The operating mechanism, moving contact 1, and arc-extinguishing chamber 3 are arranged sequentially from top to bottom, and the moving contact 1 and stationary contact 2 are arranged horizontally. The electric arc generated by the breaking of the moving contact 1 and the stationary contact 2 can be extinguished and discharged through the arc-extinguishing chamber 3. The arc-extinguishing chamber 3 includes an arc-extinguishing grid assembly 3a, an arc-extinguishing grid assembly 3b, and an arc-extinguishing grid assembly 3c. The arc-extinguishing grid assembly 3b is located at the moving contact end inside the arc-extinguishing chamber 3, and the arc-extinguishing grid assembly 3c is located at the stationary contact end inside the arc-extinguishing chamber 3. The arc-extinguishing grid assembly 3a is located inside the arc-extinguishing chamber 3 between the arc-extinguishing grid assembly 3b and the arc-extinguishing grid assembly 3c. The arc-extinguishing grid assembly 3a includes an arc-initiating plate 3a01 located below the opening area of ​​the moving contact 1. The arc-extinguishing grid assembly 3a is connected to the arc-extinguishing grid assembly 3b through the arc-initiating plate 3b01, and the arc-extinguishing grid assembly 3a is connected to the arc-extinguishing grid assembly 3c through the arc-initiating plate 3c01. In this embodiment, the arc-extinguishing grid assembly 3a is located below the opening area of ​​the moving contact 1, and the maximum opening position of the moving contact 1 is located at the arc inlet in front of the arc-extinguishing grid assembly 3b. The arc-extinguishing grid assembly 3a is inclined towards the moving contact 1. The arc-extinguishing grid 3a02 in the arc-extinguishing grid assembly 3a has a notch facing the moving contact 1, and the notch formed by the arrangement of several arc-extinguishing grid 3a02 forms a channel for the moving contact 1 to run. The arc-extinguishing grid assembly 3b includes several parallel arc-extinguishing grid 3b02, which are horizontally placed and spaced apart in the vertical direction; the arc-extinguishing grid assembly 3c includes several parallel arc-extinguishing grid 3c02, which are horizontally placed and spaced apart in the vertical direction.

[0031] Specifically, it means: as attached Figure 1 As shown in Figures 2 and 3, the arc-initiating plate 3a01 is a U-shaped arc-initiating plate, and several arc-extinguishing grid plates 3a02 are arranged on both sides of the U-shaped arc-initiating plate. The arc-extinguishing grid plates 3a02 are parallel to the two side walls of the U-shaped arc-initiating plate, and the opening of the U-shaped arc-initiating plate is away from the moving contact 1. One end of the arc-initiating plate 3b01 is parallel to the side of the arc-extinguishing grid plate group 3a near the moving contact 1, and the other end of the arc-initiating plate 3b01 is located at the bottom of the arc-extinguishing grid plate group 3b and is parallel to the several arc-extinguishing grid plates 3b02. One end of the arc-initiating plate 3c01 is parallel to the side of the arc-extinguishing grid plate group 3a near the stationary contact 2, and the other end of the arc-initiating plate 3c01 is located at the bottom of the arc-extinguishing grid plate group 3c and is parallel to the several arc-extinguishing grid plates 3c02.

[0032] Additionally, it includes a stationary arc-running plate 4, one end of which is connected to the stationary contact 2, and the other end is located on top of the arc-extinguishing grid assembly 3c and parallel to the plurality of arc-extinguishing grids 3c02. A bending portion 401 is provided between the two ends of the stationary arc-running plate 4, and the arc-initiating plate 3c01 is located in the area below the bending portion 401, with the bottom of the U-shaped bend on the arc-initiating plate 3c01 corresponding to the bending portion 401. It also includes a moving arc-running plate 5, which is located on top of the arc-extinguishing grid assembly 3b, and the arc-initiating plate 3b01 is located below the moving arc-running plate 5.

[0033] This utility model provides an arc-starting structure for a circuit breaker. By setting an arc-starting structure along the entire path of the moving and stationary contacts during the breaking process, the arc is received by the arc-starting structure at different stages of the breaking process. The entire arc is divided into multiple arc segments by the arc-starting structure. The newly generated arc can be quickly cut and extinguished by the corresponding arc-extinguishing grid and discharged from the corresponding exhaust channel, thereby improving the breaking performance of the circuit breaker.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended appendix.

[0036] The claims shall prevail.

Claims

1. An arc striking structure of a circuit breaker comprising a moving contact (1) and a stationary contact (2), said moving contact (1) and stationary contact (2) being arranged to be separated to produce an arc which is capable of being extinguished after passing through an arc chamber (3) and being discharged, characterized in that: The arc extinguishing chamber (3) comprises arc extinguishing fin group one (3a), arc extinguishing fin group two (3b) and arc extinguishing fin group three (3c), the arc extinguishing fin group two (3b) is located at the moving contact end in the arc extinguishing chamber (3), the arc extinguishing fin group three (3c) is located at the static contact end in the arc extinguishing chamber (3), the arc extinguishing fin group one (3a) is located between the arc extinguishing fin group two (3b) and the arc extinguishing fin group three (3c) in the arc extinguishing chamber (3), the arc extinguishing fin group one (3a) comprises arc plate one (3a01) located below the opening area of the moving contact (1), the arc extinguishing fin group one (3a) is connected with the arc extinguishing fin group two (3b) through arc plate two (3b01), the arc extinguishing fin group one (3a) is connected with the arc extinguishing fin group three (3c) through arc plate three (3c01), and the arc extinguishing fin group one (3a) is inclined to the side of the moving contact (1).

2. An arc striking structure of a circuit breaker according to claim 1, characterized in that: The arc extinguishing fin one (3a02) in the arc extinguishing fin group one (3a) has a notch towards the moving contact (1), and the notches of a plurality of arc extinguishing fins one (3a02) arranged form a channel for the moving contact (1) to run.

3. An arc striking structure of a circuit breaker according to claim 1, wherein: The arc plate one (3a01) is a U-shaped arc plate, a plurality of arc extinguishing fins one (3a02) are arranged on both sides of the U-shaped arc plate, the plurality of arc extinguishing fins one (3a02) are parallel to the two side walls of the U-shaped arc plate, and the opening of the U-shaped arc plate faces away from the moving contact (1).

4. An arc striking structure of a circuit breaker according to claim 1, wherein: The arc extinguishing fin group two (3b) comprises a plurality of arc extinguishing fins two (3b02) arranged in parallel, the plurality of arc extinguishing fins two (3b02) are horizontally placed and arranged in the vertical direction. The arc extinguishing fin group three (3c) comprises a plurality of arc extinguishing fins three (3c02) arranged in parallel, the plurality of arc extinguishing fins three (3c02) are horizontally placed and arranged in the vertical direction.

5. An arc striking structure of a circuit breaker according to claim 4, wherein: One side end of the arc plate two (3b01) is parallel to one side of the arc extinguishing fin group one (3a) close to the moving contact (1), and the other side end of the arc plate two (3b01) is located at the bottom of the arc extinguishing fin group two (3b) and is parallel to the plurality of arc extinguishing fins two (3b02).

6. An arc striking structure of a circuit breaker according to claim 4, wherein: One side end of the arc plate three (3c01) is parallel to one side of the arc extinguishing fin group one (3a) close to the static contact (2), and the other side end of the arc plate three (3c01) is located at the bottom of the arc extinguishing fin group three (3c) and is parallel to the plurality of arc extinguishing fins three (3c02).

7. An arc striking structure of a circuit breaker according to claim 4, wherein: It also comprises a static end arc running plate (4), one end of the static end arc running plate (4) is connected with the static contact (2), the other end is located at the top of the arc extinguishing fin group three (3c) and is parallel to the plurality of arc extinguishing fins three (3c02), a bending part (401) is arranged between the two ends of the static end arc running plate (4), the arc plate three (3c01) is located below the bending part (401), and the U-shaped bending bottom of the arc plate three (3c01) corresponds to the bending part (401).

8. An arc striking structure of a circuit breaker according to claim 7, wherein: It also comprises a moving end arc running plate (5), the moving end arc running plate (5) is located at the top of the arc extinguishing fin group two (3b), and the arc plate two (3b01) is located below the moving end arc running plate (5).

9. An arc striking structure of a circuit breaker according to claim 1, wherein: The first arc extinguishing fin group (3a) is located below the opening area of the moving contact (1), and the maximum opening position of the moving contact (1) is located at the arc entrance in front of the second arc extinguishing fin group (3b).

10. An arc striking structure of a circuit breaker as claimed in claim 1, wherein: Further comprising an operating mechanism, the operating mechanism, the moving contact (1) and the arc extinguishing chamber (3) are arranged in sequence from top to bottom, and the moving contact (1) and the static contact (2) are arranged left and right.

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