Arc extinguishing system

Abstract

An arc extinguishing system comprises a shell, the shell comprises a first arc extinguishing chamber and a second arc extinguishing chamber which are independent, an opening for a moving contact to probe in is arranged above the second arc extinguishing chamber, a run-on plate is arranged in an inner cavity of the shell, the run-on plate is located between the first arc extinguishing chamber and the second arc extinguishing chamber, the run-on plate is provided with a protruding part, and the protruding part is provided with an opening. The static contact is installed in the first arc extinguishing chamber, the contact part of the moving contact extends into the shell, the position where the moving contact makes contact with the static contact is located in an inner cavity of the shell between the first arc extinguishing chamber and the second arc extinguishing chamber, and the maximum position where the moving contact and the static contact rotate in a separated mode is located in the second arc extinguishing chamber. And the moving contact skims over the bulge part on the run-on plate in the rotating process, so that the arc is divided into two sections by the bulge part and then enters the arc extinguishing chamber I and the arc extinguishing chamber II respectively. An arc is divided into two sections of new arcs through a run-on plate structure below a contact, and the arcs are driven by air blowing to enter relatively independent arc extinguishing cavities; each arc extinguishing cavity is provided with an independent gas outlet, and high-temperature gas enters the arc extinguishing cavities and then is discharged from the gas outlets, so that the high-temperature gas does not interfere with each other. The arc extinguishing grid sheets in the arc extinguishing cavity can fully cut the arc, and the breaking capacity 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 extinguishing system. 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-ignition structure used in circuit breakers mostly involves setting moving and stationary arc-ignition 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 the long strip-shaped air duct structure with the arc-extinguishing chamber at the bottom, the airflow in the middle area is weak, and the arc lacks air blowing drive. During the contact opening process, the arc is difficult to be cut by the arc-extinguishing grid plates below the contacts, making it difficult to enter the arc-extinguishing chamber. This 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 chamber-type elongated air duct structures, such as weak airflow in the middle region, lack of air-driven arc expulsion, difficulty in cutting the arc by the arc-extinguishing grid below the contacts during contact opening, and difficulty in entering the arc-extinguishing chamber, thus increasing the difficulty of arc extinguishing, reducing the arc-extinguishing performance of the arc-extinguishing chamber, and making it difficult for the circuit breaker to meet the breaking capacity standards. This invention provides an arc-extinguishing system that divides the arc into two segments using an arc-initiating plate structure below the contacts, and air-driven arcs enter relatively independent arc-extinguishing chambers. Each arc-extinguishing chamber has an independent air outlet, and the high-temperature gas is discharged from the outlet after entering the arc-extinguishing chamber without interference. This allows the arc-extinguishing grid within the arc-extinguishing chamber to fully cut the arc, improving the breaking capacity of the circuit breaker.

[0005] To achieve the above-mentioned technical objectives, this utility model provides an arc extinguishing system, which includes a housing. The housing comprises two independent arc extinguishing chambers: a first arc extinguishing chamber and a second arc extinguishing chamber. The second arc extinguishing chamber has an opening at its top for a moving contact to enter. An arc-initiating plate is installed within the housing cavity, located between the first and second arc extinguishing chambers. The arc-initiating plate has a protrusion. A stationary contact is installed within the housing, and the contact head of the moving contact extends into the housing. The contact position between the moving and stationary contacts is located within the housing cavity between the first and second arc extinguishing chambers. The maximum rotational position of the moving and stationary contacts is within the second arc extinguishing chamber. During rotation, the moving contact passes over the protrusion on the arc-initiating plate, causing the arc to be divided into two segments by the first protrusion 2a, which then enter the first and second arc extinguishing chambers respectively.

[0006] In one embodiment, a stationary air outlet is provided on one side of the housing located at the stationary contact mounting position, and a moving air outlet is provided on the bottom surface of the housing located below the moving contact mounting position. The housing is vertically mounted on the base, and an auxiliary air passage is formed between the bottom surface of the housing and the bottom surface of the base. A stationary exhaust port is provided on one side of the auxiliary air passage located at the stationary contact mounting position, and / or a moving exhaust port is provided on one side of the auxiliary air passage corresponding to the maximum separation position between the moving contact and the stationary contact.

[0007] In one embodiment, an arc-extinguishing grid assembly one is placed inside an arc-extinguishing chamber one, with several arc-extinguishing grids one in the arc-extinguishing grid assembly one placed horizontally and arranged parallel to each other in the vertical direction. An arc-extinguishing grid assembly two is placed inside an arc-extinguishing chamber two, with several arc-extinguishing grids two placed vertically and arranged parallel to each other in the horizontal direction.

[0008] In one embodiment, one end face of the arc-initiating plate is located at the bottom of the first arc-extinguishing grid plate group and parallel to the first arc-extinguishing grid plates, and the other end face of the arc-initiating plate is located at the end of the second arc-extinguishing grid plate group near the stationary contact, and the other end face of the arc-initiating plate is parallel to the second arc-extinguishing grid plates.

[0009] In one embodiment, the air outlets of several arc-extinguishing grid plates in the first arc-extinguishing grid plate group correspond to the stationary end air outlets, and the air outlets of several arc-extinguishing grid plates in the second arc-extinguishing grid plate group correspond to the moving end air outlets. The gas extinguished by the arc-extinguishing grid plates in the second arc-extinguishing grid plate group can enter the auxiliary air passage through the moving end air outlets and then be discharged through the stationary end exhaust port and the moving end exhaust port of the auxiliary air passage.

[0010] In one embodiment, one end of the stationary arc-drawing angle is connected to the stationary contact, and the other end is arranged on the top of the arc-extinguishing grid plate group one and parallel to the plurality of arc-extinguishing grid plates one. The moving end arc-drawing angle is arranged on the side of the arc-extinguishing grid plate group away from the stationary contact.

[0011] One end of the moving end arc-inducing angle corresponds to the moving contact, and the other end is located on a side of the second arc-extinguishing grid plate group away from the stationary contact, and is parallel to the second arc-extinguishing grid plate group.

[0012] In one embodiment, the bottom surface of the base is provided with a protrusion, and the ends of several arc-extinguishing grid plates in the second arc-extinguishing grid plate group are provided with grooves. The grooves are installed in conjunction with the second protrusion 5a to divide the auxiliary airway into auxiliary airway one and auxiliary airway two.

[0013] In one embodiment, the housing is assembled from a left housing and a right housing.

[0014] In one embodiment, a magnetizing component is provided inside the housing, and the magnetizing component is arranged at least at the opening into which the moving contact is inserted.

[0015] In one embodiment, a second moving end air outlet is provided on one side of the housing corresponding to the maximum separation position between the moving contact and the stationary contact, and the second moving end air outlet is located above the moving end exhaust port. Beneficial effects

[0016] This utility model provides an arc extinguishing system, which includes a housing. The housing includes two independent arc extinguishing chambers, a first arc extinguishing chamber and a second arc extinguishing chamber. The second arc extinguishing chamber has an opening at its top for a moving contact to enter. An arc-initiating plate is installed in the inner cavity of the housing, located between the first and second arc extinguishing chambers. The arc-initiating plate has a protrusion. A stationary contact is installed inside the housing, and the contact head of the moving contact extends into the housing. The contact position between the moving contact and the stationary contact is located in the inner cavity of the housing between the first and second arc extinguishing chambers. The maximum position of the separation and rotation of the moving contact and the stationary contact is located in the second arc extinguishing chamber. During the rotation of the moving contact, it passes over the protrusion on the arc-initiating plate, causing the arc to be cut into two segments by the protrusion, which then enter the first and second arc extinguishing chambers respectively. The arc is divided into two segments by an arc-starting plate structure below the contacts, forming two new arcs. Air-blown arcs drive these segments into relatively independent arc-extinguishing chambers. Each arc-extinguishing chamber has an independent outlet; high-temperature gas exits from the outlet after entering the chamber, without interference. This allows the arc-extinguishing grid within the chamber to fully cut the arc, improving the circuit breaker's breaking capacity. Attached Figure Description

[0017] 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.

[0018] Appendix Figure 1This is a schematic diagram of the arc-extinguishing chamber installation in Embodiment 1 of this utility model. Figure 1 ;

[0019] Appendix Figure 2 This is a schematic diagram of the arc-extinguishing chamber installation in Embodiment 1 of this utility model. Figure 2 ;

[0020] Appendix Figure 3 This is a schematic diagram of the moving end of the arc-extinguishing chamber in Embodiment 1 of this utility model;

[0021] Appendix Figure 4 This is a schematic diagram of the arc-starting plate installation in Embodiment 1 of this utility model;

[0022] Appendix Figure 5 This is a schematic diagram of the closed state of the moving contact and the stationary contact in Embodiment 1 of this utility model;

[0023] Appendix Figure 6a This is a schematic diagram of the state when the moving contact and the stationary contact are separated in Embodiment 1 of this utility model. Figure 1 ;

[0024] Appendix Figure 6b 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. Figure 2 ;

[0025] Appendix Figure 7 This is a schematic diagram of the state when the moving contact and the stationary contact are separated to their maximum positions in Embodiment 1 of this utility model;

[0026] Appendix Figure 8 This is a schematic diagram of the installation of the first and second arc-extinguishing grid plate groups in Embodiment 1 of this utility model;

[0027] Appendix Figure 9 This is a schematic diagram of the position of the moving contact in Embodiment 1 of this utility model;

[0028] Appendix Figure 10a It is attached Figure 9 Sectional view along line A;

[0029] Appendix Figure 10b This is a schematic diagram of the groove position in Embodiment 1 of this utility model;

[0030] Appendix Figure 10c This is a schematic diagram of the base structure in Embodiment 1 of this utility model;

[0031] Appendix Figure 11 This is a schematic diagram of the installation position of the magnetizing component in Embodiment 1 of this utility model;

[0032] Appendix Figure 12 This is a schematic diagram of the housing installation in Embodiment 1 of this utility model;

[0033] Appendix Figure 13aThis is a schematic diagram of the arc-starting plate installation in Embodiment 2 of this utility model. Figure 1 ;

[0034] Appendix Figure 13b This is a schematic diagram of the arc-starting plate structure in Embodiment 2 of this utility model. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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

[0040] In existing circuit breakers with a bottom-mounted, elongated air duct structure for the arc-extinguishing chamber, the airflow in the middle region is weak, and the arc lacks air-driven propulsion. During the contact opening process, it is difficult for the arc to enter the arc-extinguishing grid and be cut by the grid below the contacts, thus increasing the difficulty of arc extinguishing, reducing the arc-extinguishing performance of the arc-extinguishing chamber, and making it difficult for the circuit breaker to meet the breaking performance standards. To solve this problem, this embodiment provides an arc-extinguishing system, which includes a housing 1. The housing 1 is a split type, as shown in the attached figure. Figure 3 and 12 As shown, in this embodiment, the housing 1 is preferably assembled from a left housing 1c and a right housing 1d along the Y-direction of the base width. Furthermore, the left housing 1c and the right housing 1d can be integral or separate. (See attached diagram.) Figure 4 As shown in Figures 5, 6a, 6b, and 7, the housing 1 includes two independent arc-extinguishing chambers, a first arc-extinguishing chamber 1a and a second arc-extinguishing chamber 1b. The housing 1 has an opening at its top for the moving contact 4 to enter, and the second arc-extinguishing chamber 1b also has an opening at its top for the moving contact 4 to enter. An arc-initiating plate 2 is installed inside the housing 1, located between the first arc-extinguishing chamber 1a and the second arc-extinguishing chamber 1b. The arc-initiating plate 2 has a first protrusion 2a. The stationary contact 3 is installed inside the housing 1 outside the first arc-extinguishing chamber 1a, and the contact head 4a of the moving contact 4 extends into the housing 1. Figure 5 As shown, the position where the moving contact 4 contacts the stationary contact 3 is located within the inner cavity of the housing 1 between the arc-extinguishing chamber 1a and the arc-extinguishing chamber 1b, as shown in the attached diagram. Figure 7 As shown, the maximum position of the separation and rotation of the moving contact 4 and the stationary contact 3 is located within the arc-extinguishing chamber 1b, as illustrated in the attached diagram. Figure 7 As shown, during the rotation of the moving contact 4, it passes over the first protrusion 2a on the arc-initiating plate 2, causing the electric arc to be divided into two segments by the first protrusion 2a and then enter the arc-extinguishing chamber 1a and the arc-extinguishing chamber 1b respectively.

[0041] As attached Figure 6a and 6bAs shown, in this embodiment, the left shell 1c and the right shell 1d together form an opening for the moving contact 4 to enter. Furthermore, there is also an opening above the arc-extinguishing chamber 1b for the moving contact 4 to enter. It should be noted that when the moving contact 4 passes over the first protrusion 2a on the arc-starting plate 2, the contact head 4a of the moving contact 4 may or may not make contact with the first protrusion 2a. The first protrusion 2a may have a certain degree of elasticity, allowing the moving contact 4 to lightly brush against the first protrusion 2a when it passes over it, without affecting the movement of the moving contact and improving the arc-splitting effect. The arc-starting plate 2 is preferably U-shaped, with its opening facing away from the moving contact 4, and the first protrusion 2a being the end of the arc-starting plate 2 facing away from the opening and towards the moving contact 4.

[0042] As attached Figure 8 As shown, arc-extinguishing grid assembly 6 is placed inside arc-extinguishing chamber 1a. Several arc-extinguishing grids 6a in arc-extinguishing grid assembly 6 are horizontally placed and arranged parallel to each other in the vertical direction. Arc-extinguishing grid assembly 7 is placed inside arc-extinguishing chamber 1b. Several arc-extinguishing grids 7a in arc-extinguishing grid assembly 7 are vertically placed and arranged parallel to each other in the horizontal direction. One end face of the arc-initiating plate 2 is located at the bottom of arc-extinguishing grid assembly 6 and parallel to the several arc-extinguishing grids 6a. The other end face of the arc-initiating plate 2 is located at the end of arc-extinguishing grid assembly 1b near the stationary contact 1, and the other end face of the arc-initiating plate 2 is parallel to the several arc-extinguishing grids 7a. (See attached diagram) Figure 2 As shown, a stationary air outlet 101 is provided on one side of the housing 1 at the mounting position of the stationary contact 3, as shown in the attached figure. Figure 10a As shown, a moving end air outlet 103 is provided on the bottom surface of the housing 1 below the mounting position of the moving contact 4; simultaneously, as shown in the attached... Figure 1 As shown in Figures 2 and 3, the housing 1 is mounted on the base 5 along the vertical X direction. An auxiliary air passage a is formed between the bottom surface of the housing 1 and the bottom surface of the base 5. A stationary exhaust port a1 is provided on one side of the auxiliary air passage a at the mounting position of the stationary contact 3, and / or a moving exhaust port a2 is provided on one side of the auxiliary air passage a corresponding to the maximum separation position between the moving contact 4 and the stationary contact 3. (See attached figure) Figure 8 As shown, the outlets 6a01 of several arc-extinguishing grid plates 6a in the arc-extinguishing grid plate group 6 correspond to the stationary end outlet 101. The outlets 7a01 of several arc-extinguishing grid plates 7a in the arc-extinguishing grid plate group 7 correspond to the moving end outlet 103. The gas extinguished by the arc-extinguishing grid plates 7a in the arc-extinguishing grid plate group 7 can enter the auxiliary air passage a through the moving end outlet 103 and then be discharged through the stationary end exhaust port a1 and the moving end exhaust port a2 of the auxiliary air passage a.

[0043] When the circuit breaker is in operation, an electric arc is generated after the moving contact 4 separates from the stationary contact 3. Before the moving contact 4 moves above the first protrusion 2a of the arc-starting plate 2, the electric arc moves between the first arc-extinguishing chamber 1a and the second arc-extinguishing chamber 1b. After the rotating motion of the moving contact 4 sweeps over the first protrusion 2a of the arc-starting plate 2, the electric arc is divided into two by the arc-starting plate 2 and transferred to the first arc-extinguishing chamber 1a and the second arc-extinguishing chamber 1b through the stationary arc-starting angle 8 and the moving-end arc-starting angle 9. The high-temperature gas in the first arc-extinguishing chamber 1a is discharged from the stationary end outlet 101, and the high-temperature gas in the second arc-extinguishing chamber 1b is discharged from the stationary end exhaust port a1 and the moving end exhaust port a2 through the independent auxiliary air passage a.

[0044] Further details are attached. Figure 1 As shown, in order to facilitate the smooth discharge of high-temperature gas from the stationary exhaust port a1 and the moving exhaust port a2, a second moving exhaust port 102 is provided on one side of the housing 1 corresponding to the maximum separation position between the moving contact 4 and the stationary contact 3. The second moving exhaust port 102 is located above the moving exhaust port a2. At the same time, the second moving exhaust port 102 can also discharge some high-temperature gas.

[0045] As attached Figure 5 and 6a As shown in Figure 6b, one end of the stationary arc-quenching angle 8 is connected to the stationary contact 3, and the other end is arranged on the top of the arc-quenching grid assembly 6 and parallel to the plurality of arc-quenching grids 6a, as shown in the attached figure. Figure 7 As shown, a moving end arc-inducing angle 9 is arranged on the side of the arc-extinguishing grid assembly 7 away from the stationary contact 3. Specifically, one end of the moving end arc-inducing angle 9 corresponds to the moving contact 4, and the other end is located on the side of the arc-extinguishing grid assembly 7 away from the stationary contact 3, and is parallel to the plurality of arc-extinguishing grids 7a.

[0046] As attached Figure 9 and 10a As shown in 10b and 10c, the bottom surface of the base 5 is provided with a second protrusion 5a, and the ends of several arc-extinguishing grid plates 7a in the arc-extinguishing grid plate group 7 are provided with grooves 7a02. The grooves 7a02 are installed in conjunction with the second protrusion 5a, dividing the auxiliary air passage a into auxiliary air passage a1 and auxiliary air passage a2, which helps to stabilize the arc in the arc-extinguishing grid plate group and prevents the arc from being sprayed into the auxiliary air passage and bypassing the arc-extinguishing grid plate group to connect directly.

[0047] To further increase the magnetic blowout force of the electric arc, as shown in the attached... Figure 11 As shown, a magnetizing component 10 is provided inside the housing 1. The magnetizing component 10 is arranged between the first arc-extinguishing grid group 6 and the second arc-extinguishing grid group 7, at least at the opening into which the moving contact 4 of the housing 1 is inserted. Furthermore, the magnetizing component 10 can extend to the entrance of the arc-extinguishing chamber 1a, that is, the magnetizing component 10 is arranged on both sides of the arc entrance of the first arc-extinguishing grid group 6 and the second arc-extinguishing grid group 7. Example

[0048] As attached Figure 13a and 13b As shown in this embodiment, the first protrusion 2a of the U-shaped arc-leading plate 2 may also be provided with walls 2a01 facing the moving contact 4 on both sides. When the contact head 4a of the moving contact 4 passes over the first protrusion 2a, the walls 2a01 on both sides will compress the electric arc.

[0049] 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.

[0050] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are 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 modifications and improvements are all protected by this application.

[0051] Scope. Therefore, the scope of protection of this patent application shall be determined by the appended claims.

Claims

1. An arc quenching system comprising a housing (1), characterised in that: The shell (1) comprises independent arc-extinguishing chamber one (1a) and arc-extinguishing chamber two (1b), the upper part of arc-extinguishing chamber two (1b) has an opening for the moving contact to explore, the shell (1) has an arc plate (2) in the inner cavity, the arc plate (2) is located between arc-extinguishing chamber one (1a) and arc-extinguishing chamber two (1b), the arc plate (2) has a first protruding part (2a), the static contact (3) is installed in the shell (1), the contact part (4a) of the moving contact (4) extends into the shell (1), the position where the moving contact (4) contacts the static contact (3) is located in the inner cavity of the shell (1) between arc-extinguishing chamber one (1a) and arc-extinguishing chamber two (1b), the maximum position where the moving contact (4) and the static contact (3) are separated and rotated is located in arc-extinguishing chamber two (1b), the moving contact (4) sweeps the first protruding part (2a) on the arc plate (2) during rotation, so that the electric arc is divided into two arcs by the first protruding part (2a) and then enters arc-extinguishing chamber one (1a) and arc-extinguishing chamber two (1b) respectively.

2. An arc quenching system as claimed in claim 1, characterized in that: The side end of the shell (1) at the installation position of the static contact (3) is provided with a static end gas outlet (101), the bottom surface of the shell (1) is provided with a moving end gas outlet one (103) below the installation position of the moving contact (4), the shell (1) is vertically installed on the base (5), and the bottom surface of the shell (1) and the bottom surface of the base (5) form an auxiliary air channel (a), the static end gas outlet (a1) is arranged on the side end of the auxiliary air channel (a) at the installation position of the static contact (3), and / or the moving end gas outlet (a2) is arranged on the side end of the auxiliary air channel (a) corresponding to the maximum separation position of the moving contact and the static contact (3).

3. An arc quenching system as claimed in claim 1, wherein: Arc-extinguishing fin group one (6) is arranged in arc-extinguishing chamber one (1a), and a plurality of arc-extinguishing fins one (6a) in the arc-extinguishing fin group one (6) are horizontally arranged and parallelly and spaced apart in the vertical direction, arc-extinguishing fin group two (7) is arranged in arc-extinguishing chamber two (1b), and a plurality of arc-extinguishing fins two (7a) in the arc-extinguishing fin group two (7) are vertically arranged and parallelly and spaced apart in the horizontal direction.

4. An arc quenching system as claimed in claim 3, characterized in that: One side end surface of the arc plate (2) is located at the bottom of the arc-extinguishing fin group one (6) and is parallel to the plurality of arc-extinguishing fins one (6a), and the other side end surface of the arc plate (2) is located at one end of the arc-extinguishing fin group two (7) close to the static contact (3), and the other side end surface of the arc plate (2) is parallel to the plurality of arc-extinguishing fins two (7a).

5. An arc quenching system as claimed in claim 3, wherein: The gas outlet one (6a01) of the plurality of arc-extinguishing fins one (6a) in the arc-extinguishing fin group one (6) corresponds to the static end gas outlet (101), the gas outlet two (7a01) of the plurality of arc-extinguishing fins two (7a) in the arc-extinguishing fin group two (7) corresponds to the moving end gas outlet one (103), and the gas after arc-extinction of the plurality of arc-extinguishing fins two (7a) in the arc-extinguishing fin group two (7) can enter the auxiliary air channel (a) through the moving end gas outlet one (103) and then be discharged through the static end gas outlet (a1) and the moving end gas outlet (a2) of the auxiliary air channel (a).

6. An arc quenching system as claimed in claim 3, wherein: The static arc leading angle (8) is connected with the static contact (3) at one end and arranged on the top of the first group of arc extinguishing grid pieces (6) and parallel to the first group of arc extinguishing grid pieces (6a). The dynamic arc leading angle (9) is corresponded with the dynamic contact (4) at one end and arranged on the side of the second group of arc extinguishing grid pieces (7) far from the static contact (3) and parallel to the second group of arc extinguishing grid pieces (7a).

7. An arc quenching system as claimed in claim 2, wherein: The bottom surface of the base (5) is provided with a second protruding part (5a), the end of the second group of arc extinguishing grid pieces (7a) in the second group of arc extinguishing grid pieces (7) is provided with a groove (7a02), the groove (7a02) is matched and installed with the second protruding part (5a), and the auxiliary air channel (a) is divided into the first auxiliary air channel (a01) and the second auxiliary air channel (a02).

8. An arc quenching system as claimed in claim 1, wherein: The shell (1) is assembled by the left shell (1c) and the right shell (1d).

9. An arc quenching system as claimed in claim 1, wherein: The shell (1) is provided with a magnetic enhancement component (10) arranged at least at the opening where the dynamic contact (4) is inserted.

10. An arc quenching system as claimed in claim 1, wherein: The side end of the shell (1) corresponding to the maximum separation position of the dynamic contact (4) and the static contact (3) is provided with a dynamic end air outlet two (102), and the dynamic end air outlet two (102) is located above the dynamic end air outlet (a2).

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