Arc extinguish chamber structure and circuit breaker

Abstract

An arc extinguish chamber structure comprises a main arc extinguish chamber and further comprises a first arc extinguish chamber arranged above the main arc extinguish chamber and / or a second arc extinguish chamber arranged behind the main arc extinguish chamber, a plurality of arc extinguish grid pieces are arranged in the first arc extinguish chamber, and a plurality of arc extinguish grid pieces are arranged in the second arc extinguish chamber. The main arc extinguish chamber comprises a plurality of arc extinguish grid sheets which are stacked in the vertical direction, the arc extinguish grid sheets of the main arc extinguish chamber are staggered front and back, the arc extinguish grid sheets in the main arc extinguish chamber are stacked in a radial shape, extension lines of the adjacent arc extinguish grid sheets intersect, an included angle is an acute angle, and the arc extinguish grid sheets in the main arc extinguish chamber intersect with the extension lines of the arc extinguish grid sheets. And the distance between the arc extinguishing grid sheets adjacent to one end close to the contact mechanism is smaller than the distance between the arc extinguishing grid sheets adjacent to one end far away from the contact mechanism. According to the arc extinguishing chamber, a better arc extinguishing effect is generated by using the same arc extinguishing chamber space.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to an arc extinguishing chamber structure and a circuit breaker. Background Art

[0002] With the rapid development of the new energy industry, DC technology is becoming increasingly widely used, and the performance requirements for molded case circuit breakers in photovoltaic power supply DC systems are gradually increasing. As a key functional component in a molded case circuit breaker, the performance of the arc extinguishing chamber plays a decisive role in the circuit breaker's interrupting capacity and service life. Unlike AC systems, where AC current crosses a zero point, making arcs easily extinguished, DC current has no zero crossing, necessitating arc extinguishing by increasing the arc voltage or connecting contacts in series to share the arc energy.

[0003] Conventional arc extinguishing chambers use metal grids to divide the arc, forming a series of short arcs to increase the arc voltage and achieve arc extinguishing. However, as the interrupting capacity requirements of arc extinguishing chambers increase, the arc elongation and cooling capabilities of the arc extinguishing chamber need to be further improved. Traditional single arc extinguishing chambers achieve high interrupting capacity by increasing the number of grids and the surface area of ​​the grids, but this increases the size of the arc extinguishing chamber, affecting the overall size of the circuit breaker. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide an arc extinguishing chamber structure and a circuit breaker with double arc extinguishing chambers and capable of accommodating more arc extinguishing grids in the same space.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, the present application provides an arc extinguishing chamber structure, comprising a main arc extinguishing chamber, and further comprising a first arc extinguishing chamber disposed above the main arc extinguishing chamber, and / or a second arc extinguishing chamber disposed behind the main arc extinguishing chamber, wherein a plurality of arc extinguishing grids are disposed in the first arc extinguishing chamber, and a plurality of arc extinguishing grids are disposed in the second arc extinguishing chamber;

[0007] The main arc extinguishing chamber comprises a plurality of arc extinguishing grids stacked in a vertical direction, wherein the arc extinguishing grids of the main arc extinguishing chamber are arranged in a staggered manner in front and back.

[0008] The plurality of arc-extinguishing grids in the main arc-extinguishing chamber are radially stacked, and adjacent arc-extinguishing grids intersect with the extension lines of the arc-extinguishing grids at an acute angle, and the distance between adjacent arc-extinguishing grids at one end close to the contact mechanism is smaller than the distance between adjacent arc-extinguishing grids at one end away from the contact mechanism.

[0009] In one possible implementation, the multiple arc-extinguishing grids of the main arc-extinguishing chamber are divided into at least a first grid group, a second grid group, and a third grid group, which are arranged in sequence from top to bottom in a vertical direction. The first grid group includes a plurality of first grids, the second grid group includes a plurality of second grids, and the third grid group includes a plurality of third grids. The plurality of first grids, the plurality of second grids, and the plurality of third grids are stacked in a vertical direction. The first grids, the second grids, and the third grids all have a first arc-conducting channel with an open structure in the middle, and two grid legs are formed on both sides of the first arc-conducting channel. All arc-extinguishing grids of the second grid group are alternately arranged in a front-to-back staggered manner. The front-to-back staggered distance between adjacent arc-extinguishing grids of the second grid group is greater than the front-to-back staggered distance between adjacent arc-extinguishing grids of the first grid group and the third grid group.

[0010] In one possible implementation, the length of the grid leg of the first grid piece is smaller than the length of the grid leg of the second grid piece; the angle between the inner side relative to the opening of the first arcing channel of the first grid piece and the second grid piece and the extension direction of the grid legs on both sides is an acute angle or an obtuse angle, and the inner side relative to the opening of the first arcing channel of the third grid piece is perpendicular to the extension direction of the grid legs on both sides.

[0011] In one possible implementation, the plurality of arc-extinguishing grids in the first arc-extinguishing chamber can be divided into at least a first upper grid group and a second upper grid group, wherein the first upper grid group includes a plurality of upper grids arranged in sequence along the horizontal direction, and the upper grids are arranged vertically, and the second upper grid group includes a plurality of upper grids arranged obliquely and in parallel.

[0012] In a possible implementation, the angle between adjacent arc-extinguishing grids in the main arc-extinguishing chamber is 1°.

[0013] In one possible implementation, a second arc-conducting channel with an open structure is provided in the middle of the upper grid of the first arc-extinguishing chamber. The second arc-conducting channel has a plurality of inclined structures therein, and the plurality of inclined structures form at least one pointed structure.

[0014] In one possible implementation, the second arc channel includes a U-shaped first notch, a second notch is opened at the bottom of the first notch, the second notch is set toward one side of the first notch, and a triangular raised tip structure is provided in the second notch, one corner of the triangle is raised and inclined toward the bottom center position of the first notch.

[0015] In a possible implementation, there is a gap between the main arc-extinguishing chamber and the second arc-extinguishing chamber in the horizontal direction.

[0016] In one possible implementation, the upper grid of the first upper grid group of the first arc extinguishing chamber close to the contact mechanism is connected to the first arc-striking grid; the first grid of the first grid group of the main arc extinguishing chamber close to the first upper grid group is connected to the second arc-striking grid, and the second arc-striking grid is connected to the first upper grid group.

[0017] In a possible implementation, the first arc-striking grid includes a first arc-striking piece, wherein a first arc-striking portion is bent and connected to the middle portion of one side of the first arc-striking piece;

[0018] The second arc-striking grid includes a second arc-striking plate, and a fourth arc-guiding channel with an opening structure is provided in the middle of one side of the second arc-striking plate. The inner side edge of the fourth arc-guiding channel relative to the opening is bent and connected to a second arc-striking portion, and the second arc-striking portion is connected to the first arc extinguishing chamber.

[0019] In one possible implementation, the main arc-extinguishing chamber also includes main insulating side plates arranged on both sides of the main arc-extinguishing chamber, the first arc-extinguishing chamber also includes first insulating side plates arranged on both sides of the first arc-extinguishing chamber, and / or the second arc-extinguishing chamber also includes second insulating side plates arranged on both sides of the second arc-extinguishing chamber; the multiple arc-extinguishing grids in the main arc-extinguishing chamber are installed on the main insulating side plates on both sides, the multiple arc-extinguishing grids in the first arc-extinguishing chamber are installed on the first insulating side plates on both sides, and / or the multiple arc-extinguishing grids in the second arc-extinguishing chamber are installed on the second insulating side plates on both sides.

[0020] In one possible implementation, gas-producing parts are also provided in the main insulating side plate of the main arc-extinguishing chamber and the first insulating side plate of the first arc-extinguishing chamber, and / or the second insulating side plate of the second arc-extinguishing chamber, and the multiple arc-extinguishing grids in the main arc-extinguishing chamber and the first arc-extinguishing chamber are inserted into the gas-producing parts on both sides, and / or the multiple arc-extinguishing grids in the main arc-extinguishing chamber and the second arc-extinguishing chamber are inserted into the gas-producing parts on both sides.

[0021] In one possible implementation, the first arc-extinguishing chamber is partially placed in the main arc-extinguishing chamber and is limited by main insulating side plates on both sides of the main arc-extinguishing chamber.

[0022] In a second aspect, the present application provides a circuit breaker comprising the arc extinguishing chamber structure described above.

[0023] Compared with the existing technology, by arranging the first arc extinguishing chamber and the main arc extinguishing chamber in the upper and lower parts, and / or arranging the main arc extinguishing chamber and the second arc extinguishing chamber in the front and back parts, more arc extinguishing grids can be arranged in the same space in the arc extinguishing chamber. More arc extinguishing grids can improve the arc voltage index. On the basis of achieving the same effect, more space inside the arc extinguishing chamber structure can be saved and the volume of the circuit breaker can be reduced.

[0024] At the same time, the first arc extinguishing chamber can improve the arc processing capacity of the moving contact in the open position. The arc that has not been processed cleanly in the main arc extinguishing chamber will enter the second arc extinguishing chamber for secondary arc extinguishing, and the arc extinguishing effect is better. By stacking multiple arc extinguishing grids in a radial shape, it can correspond to the movement trajectory of the moving contact. Because the movement trajectory of the moving contact is arc-shaped during the contact and separation process between the moving contact and the static contact, the movement trajectory of the moving contact is arc-shaped, and the movement trajectory of the arc following the moving contact is also approximately arc-shaped. The radial stacking of multiple arc extinguishing grids can reduce the resistance of the arc movement, which is more conducive to the arc entering the first arc extinguishing chamber smoothly and achieving a better arc extinguishing effect.

[0025] Furthermore, the staggered arrangement of the arc extinguishing grids has a beneficial effect on the initial movement of the arc and current limiting, because the staggered arrangement of the arc extinguishing grids effectively reduces the pressure at the entrance of the arc extinguishing grids, making the arc movement smoother. The arc can be smoothly cut by the arc extinguishing grids, thereby quickly increasing the arc voltage and achieving a better current limiting effect.

[0026] Furthermore, the main arc extinguishing chamber includes a first grid group, a second grid group and a third grid group stacked in sequence from top to bottom, and the structures of the first grid, the second grid and the third grid in the first grid group, the second grid group and the third grid group are different. The lengths of the first grid and the second grid legs are different. The second grid legs are longer than the first grid legs. The space in the middle of the main arc extinguishing chamber is larger, and the second grid legs can extend more into the interior of the main arc extinguishing chamber, closer to the arc, which is conducive to arc extinguishing; because the third grid group is closer to the starting end of the arc, the third grid is set to a vertical structure relative to the inner side edge of the opening and the extension direction of the grid legs on both sides, which can increase the contact area between the arc and the third grid, which is more conducive to cooling the arc.

[0027] Furthermore, the structure formed by the tip structures of the multiple upper grids in the first arc extinguishing chamber can be but is not limited to a serrated structure. After the multiple upper grids in the first arc extinguishing chamber are arranged in an interlaced manner, the second arc-guiding channel in the middle will form a serrated shape. Utilizing the principle of tip discharge, the serrated shape can better attract the arc into the arc extinguishing chamber.

[0028] Furthermore, the inclined surfaces of adjacent arc-extinguishing grids are staggered to form an inwardly concave chamfer in the middle of the main arc-extinguishing chamber. The formed chamfer is more conducive to lengthening the arc to achieve a better arc-extinguishing effect.

[0029] Furthermore, the gap between the main arc extinguishing chamber and the second arc extinguishing chamber can produce an effect similar to that of longitudinal seam arc extinguishing, which is more conducive to the cooling and extinguishing of the arc.

[0030] Furthermore, by setting a first arc-striking grid, when the moving contact of the contact mechanism moves to the maximum opening distance (the moment when the moving contact and the static contact discharge), the arc is facilitated to jump from the moving contact to the first arc-extinguishing chamber and be extinguished by the first arc-extinguishing chamber. By setting a second arc-striking grid to connect the first arc-extinguishing chamber and the main arc-extinguishing chamber, the arc that has not been cleaned up in the first arc-extinguishing chamber is facilitated to jump from the first arc-extinguishing chamber to the main arc-extinguishing chamber and be extinguished by the main arc-extinguishing chamber.

[0031] Furthermore, by arranging main insulating side plates on both sides of the main arc extinguishing chamber, arranging first insulating side plates on both sides of the first arc extinguishing chamber and / or arranging second insulating side plates on both sides of the second arc extinguishing chamber, the arc extinguishing chamber structure can be insulated and protected to prevent the high temperature of the arc from burning other components inside the circuit breaker.

[0032] Furthermore, the gas-producing component generates gas under the high-temperature erosion of the arc to further cool and accelerate the arc, and promotes the arc to move inside a plurality of arc-extinguishing grids arranged at intervals, thereby achieving the purpose of efficient arc extinguishing. The structural design of the arc-extinguishing grid inserted into the accommodating groove of the gas-producing component greatly reduces the distance between the arc-extinguishing grid and the gas-producing component, which is more conducive to the high-temperature burning of the arc on the gas-producing component to generate gas, thereby accelerating the cooling of the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 、 Figure 2 and Figure 3 This is a schematic diagram of the structure of the utility model's arc extinguishing chamber structure with double arc extinguishing chambers arranged up and down;

[0034] Figure 4 This is a schematic diagram of the structure of the double arc extinguishing chambers arranged front and back in the arc extinguishing chamber structure of the utility model;

[0035] Figure 5 This is a schematic diagram of the structure of the utility model in which the gas generating component is installed inside the double arc extinguishing chamber arranged front and back;

[0036] Figure 6 This is a schematic diagram of the structure of the gas-generating components in the front and rear arrangement scheme of the present invention;

[0037] Figure 7 This is a schematic structural diagram of the first grid piece of the utility model;

[0038] Figure 8 This is a schematic structural diagram of the second grid piece of the utility model;

[0039] Figure 9 This is a schematic structural diagram of the third grid piece of the utility model;

[0040] Figure 10 This is a schematic diagram of the structure of the utility model in which the gas generating component is installed inside the double arc extinguishing chamber arranged up and down;

[0041] Figure 11This is a schematic diagram of the structure of the gas-generating components in the upper and lower arrangement scheme of the utility model;

[0042] Figure 12 This is a schematic structural diagram of the upper grid plate of the utility model;

[0043] Figure 13 This is a schematic structural diagram of the first arc striking grid of the utility model;

[0044] Figure 14 This is a schematic structural diagram of the second arc striking grid of the utility model;

[0045] Figure 15 It is a structural diagram of the base of the utility model;

[0046] Figure 16 This is a schematic diagram of the structure of the middle cover of the utility model;

[0047] The numbers in the accompanying drawings include: base 101; middle cover 103; main arc extinguishing chamber 2; first arc extinguishing chamber 1; second arc extinguishing chamber 3; first grid plate group 21; second grid plate group 22; third grid plate group 23; first grid plate 211; second grid plate 221; third grid plate 231; grid leg 123; inner side 124; first upper grid plate group 11; second upper grid plate group 12; upper grid plate 13; tip structure 15; first arc-starting grid plate 14; second arc-starting grid plate 24; first arc-starting plate 141; first arc-starting portion 142; second arc-starting plate 241; second arc-starting portion 242; main insulating side plate 25; first insulating side plate 17; second insulating side plate 32; first mounting structure 26; third mounting structure 16; gas generating part 28; accommodating groove 281; base 101; middle cover 103; first limiting structure 102; second limiting structure 104. DETAILED DESCRIPTION

[0048] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the present invention. The protection scope of the present invention is not limited to the description of the following embodiments.

[0049] A circuit breaker is an electrical switching device connected to a power line for conducting or disconnecting an electrical circuit. It can close, carry, and interrupt current under normal circuit conditions, and can close, carry, and interrupt current under abnormal circuit conditions within a specified time. A circuit breaker generally consists of a contact mechanism, an arc extinguishing system, an operating mechanism, a housing, etc. The contact mechanism includes a moving contact and a static contact. The connection and disconnection of the moving contact and the static contact connect and disconnect the circuit. The arc extinguishing system is often provided in correspondence with the contact mechanism and is used to extinguish the arc generated when the moving contact and the static contact are connected or disconnected. The operating mechanism is connected to the moving contact and is used to drive the moving contact to swing and connect or disconnect with the static contact. The operating mechanism is provided with a handle that can be used by staff to manually operate the circuit breaker to open and close.

[0050] like Figures 1-16 As shown, the present application provides an arc extinguishing chamber structure, which includes a plurality of arc extinguishing grids arranged at intervals. The arc extinguishing chamber structure is installed between the base 101 and the middle cover 103 of the circuit breaker.

[0051] The arc extinguishing chamber structure includes a main arc extinguishing chamber 2, a first arc extinguishing chamber 1 arranged above the main arc extinguishing chamber 2, and / or a second arc extinguishing chamber 3 arranged behind the main arc extinguishing chamber 2, wherein a plurality of arc extinguishing grids are arranged in the first arc extinguishing chamber 1, and a plurality of arc extinguishing grids are arranged in the second arc extinguishing chamber 3;

[0052] The main arc extinguishing chamber 2 includes a plurality of arc extinguishing grids stacked in a vertical direction, and the arc extinguishing grids of the main arc extinguishing chamber 2 are staggered in front and back.

[0053] The multiple arc-quenching grids in the main arc-extinguishing chamber 2 are radially stacked, with adjacent arc-quenching grids intersecting with their extension lines at an acute angle. Furthermore, the distance between adjacent arc-quenching grids at the end near the contact mechanism is smaller than the distance between adjacent arc-quenching grids at the end far from the contact mechanism. In other words, the distance between adjacent arc-quenching grids near the arc-entry end of the main arc-extinguishing chamber 2 is smaller than the distance between adjacent arc-quenching grids at the arc-exit end of the main arc-extinguishing chamber 2.

[0054] By providing a first arc extinguishing chamber 1 and a main arc extinguishing chamber 2 arranged vertically, and / or providing a main arc extinguishing chamber 2 and a second arc extinguishing chamber 3 arranged front to back, more arc extinguishing grids can be arranged within the same space within the arc extinguishing chamber. More arc extinguishing grids can improve the arc voltage index, thereby achieving the same effect while further saving space within the arc extinguishing chamber structure and reducing the size of the circuit breaker. At the same time, the first arc extinguishing chamber 1 can improve the arc handling capacity of the moving contact in the open position. Arcs that are not properly handled in the main arc extinguishing chamber 2 will enter the second arc extinguishing chamber 3 for secondary arc extinguishing, resulting in better arc extinguishing effect.

[0055] In the present application, among the multiple arc-extinguishing grids in the main arc-extinguishing chamber 2, the angle between the arc-extinguishing grids is 1°. By stacking the multiple arc-extinguishing grids in a radial manner, it can correspond to the movement trajectory of the moving contact. Because during the contact and separation process between the moving contact and the static contact, the movement trajectory of the moving contact is arc-shaped, and the movement trajectory of the arc following the moving contact is also approximately arc-shaped. The radial stacking of multiple arc-extinguishing grids can reduce the resistance to the arc movement, which is more conducive to the arc smoothly entering the first arc-extinguishing chamber 1, thereby achieving a better arc extinguishing effect.

[0056] Preferably, Figure 1 and Figure 2As shown, the multiple arc extinguishing grids of the main arc extinguishing chamber 2 are at least divided into a first grid group 21, a second grid group 22 and a third grid group 23 arranged in sequence from top to bottom in the vertical direction, the first grid group 21 includes a plurality of first grids 211, the second grid group 22 includes a plurality of second grids 221, and the third grid group 23 includes a plurality of third grids 231. The plurality of first grids 211, the plurality of second grids 221 and the plurality of third grids 231 are stacked in the vertical direction, and the first grids 211, the second grids 221 and the third grids 231 are stacked in the vertical direction. Each of the plates 231 has a first arc-conducting channel with an opening in the middle, with two grid legs 123 formed on either side of the first arc-conducting channel. The length of the grid legs 123 of the first grid plate 211 is less than that of the second grid leg 123 of the second grid plate 221. The angles between the inner side edges 124 of the first arc-conducting channels of the first and second grid plates 211 and 221 relative to the opening and the extension direction of the grid legs 123 on both sides are acute or obtuse. The inner side edges 124 of the first arc-conducting channels of the third grid plate 231 relative to the opening and the extension direction of the grid legs 123 on both sides are perpendicular.

[0057] The main arc extinguishing chamber 2 described in the present application includes a first grid group 21, a second grid group 22, and a third grid group 23, which are stacked in sequence from top to bottom. The structures of the first grid group 21, the second grid group 22, and the third grid group 23 are different. The grid legs 123 of the first grid group 211 and the second grid group 221 are different in length. The grid leg 123 of the second grid group 221 is longer than the grid leg 123 of the first grid group 211. The central space of the main arc extinguishing chamber 2 is larger, and the grid leg 123 of the second grid group 221 can extend further into the main arc extinguishing chamber 2, closer to the arc, which is beneficial for arc extinguishing. Because the third grid group 23 is closer to the starting point of the arc, the third grid group 231 is arranged to extend perpendicularly relative to the inner side 124 of the opening and the extension direction of the grid legs 123 on both sides. This can increase the contact area between the arc and the third grid group 231, which is more conducive to arc cooling.

[0058] Preferably, the first grid plate 211 , the second grid plate 221 and the third grid plate 231 are square structures.

[0059] in, Figure 7 is a schematic structural diagram of the first grid plate 211, Figure 8 is a schematic structural diagram of the second grid plate 221, Figure 9 is a schematic structural diagram of the third grid plate 231,

[0060] Preferably, Figure 2As shown, the multiple arc-extinguishing grids in the first arc-extinguishing chamber 1 can be divided into at least a first upper grid group 11 and a second upper grid group 12. The first upper grid group 11 includes a plurality of upper grids 13 arranged in sequence along the horizontal direction, and the upper grids 13 are arranged vertically. The second upper grid group 12 includes a plurality of upper grids 13 arranged obliquely and arranged in parallel. The angle between the plurality of upper grids 13 in the second upper grid group 12 and the horizontal direction is an acute angle on the side away from the contact mechanism. The first upper grid group 11 is connected to the second upper grid group 12.

[0061] like Figure 4 and Figure 5 As shown, the plurality of arc-extinguishing grids in the second arc-extinguishing chamber 3 are stacked in a vertical direction.

[0062] like Figure 2 and Figure 5 As shown, the arc-quenching grids of the main arc-quenching chamber 2 are arranged in a staggered manner. The staggered arrangement of the arc-quenching grids has a beneficial effect on the initial movement of the arc and current limiting, because the staggered arrangement of the arc-quenching grids effectively reduces the pressure at the entrance of the arc-quenching grids, making the arc movement smoother. The arc can be smoothly cut by the arc-quenching grids, thereby quickly increasing the arc voltage and achieving a better current limiting effect. It should be noted that the staggered arrangement of the arc-quenching grids can be a staggered arrangement of only some of the arc-quenching grids, or a staggered arrangement of some of the arc-quenching grids of the first grid group 21, and / or the second grid group 22, and / or the third grid group 23.

[0063] Preferably, all arc-extinguishing grids of the second grid group 22 are alternately arranged in a staggered manner, and the staggered distance between adjacent arc-extinguishing grids of the second grid group 22 in the main arc-extinguishing chamber 2 is greater than the staggered distance between adjacent arc-extinguishing grids of the first grid group 21 and the third grid group 23.

[0064] Preferably, Figure 12 As shown, the upper grid 13 of the first arc extinguishing chamber 1 is an arc-shaped structure, with a second arc-passing channel with an open structure in the middle, and multiple inclined structures in the second arc-passing channel, and the multiple inclined structures form at least one tip structure 15. Specifically, the second arc-passing channel includes a U-shaped first notch, a second notch is opened at the bottom of the first notch, and the second notch is arranged toward one side of the first notch, that is, relatively away from the other side of the first notch, and a triangular protruding tip structure 15 is provided in the second notch, with one corner of the triangle protruding and inclined toward the bottom center of the first notch. Preferably, the adjacent upper grids 13 of the first arc extinguishing chamber 1 are staggered with the adjacent ones in reverse, that is, the second notches of the adjacent upper grids 13 are inclined toward the side opposite to the first notch, and the inclination directions of the tip structures 15 are opposite.

[0065] Furthermore, the structure formed by the tip structure 15 of the multiple upper grid plates 13 in the first arc extinguishing chamber 1 in the first arc extinguishing chamber 1 can be but is not limited to a serrated structure. After the multiple upper grid plates 13 in the first arc extinguishing chamber 1 are arranged in an alternating manner, the second arc path in the middle will form a serrated shape. Utilizing the principle of tip discharge, the serrated shape can better attract the arc into the arc extinguishing chamber.

[0066] Preferably, the structure and arrangement layout of the multiple arc-extinguishing grids in the second arc-extinguishing chamber 3 can be the same as the multiple arc-extinguishing grids in the main arc-extinguishing chamber 2. The multiple arc-extinguishing grids in the second arc-extinguishing chamber 3 correspond one-to-one to the multiple arc-extinguishing grids in the main arc-extinguishing chamber 2, which is more conducive to the arc entering the second arc-extinguishing chamber 3 from the main arc-extinguishing chamber 2, and can split and cool the arc faster. Of course, the arc-extinguishing grids in the second arc-extinguishing chamber 3 can also have the same structure.

[0067] Preferably, the adjacent arc-extinguishing grids of the main arc-extinguishing chamber 2 are arranged in a forward and reverse staggered arrangement, that is, the arc-extinguishing grids are installed in the forward direction, and the other arc-extinguishing grid is rotated 180 degrees and installed in the reverse direction, so that the inner side edges 124 of the first arc path of the adjacent first grid 211 are inclined in opposite directions, and the inner side edges 124 of the first arc path of the second grid 221 are inclined in opposite directions. The staggered arrangement of the inclined surfaces of the adjacent arc-extinguishing grids will form an inwardly concave chamfer in the middle of the main arc-extinguishing chamber 2. The formed chamfer is more conducive to lengthening the arc to achieve a better arc extinguishing effect. Preferably, the adjacent arc-extinguishing grids of the first arc-extinguishing chamber 1 or the adjacent arc-extinguishing grids of the second arc-extinguishing chamber 3 are arranged in a forward and reverse staggered arrangement.

[0068] Preferably, Figure 4 and Figure 5 As shown, there is a gap in the horizontal direction between the main arc extinguishing chamber 2 and the second arc extinguishing chamber 3. Further, the gap is preferably between 3 mm and 5 mm.

[0069] Furthermore, in a preferred embodiment, a third arc-conducting channel is provided in the middle of the arc-conducting grid in the second arc-conducting chamber 3. The third arc-conducting channel has a plurality of inclined structures. The plurality of inclined structures form at least one tip structure 15. The tip structure 15 utilizes the distance of the tip discharge to attract the arc.

[0070] Preferably, the thickness of the arc extinguishing grids in the first arc extinguishing chamber 1, the main arc extinguishing chamber 2 and the second arc extinguishing chamber 3 is 2 mm, the distance between adjacent upper grids 13 of the first upper grid group 11 in the first arc extinguishing chamber 1 and the distance between adjacent upper grids 13 of the second upper grid group 12 are both 2.5 mm, and the maximum distance between adjacent arc extinguishing grids in the second arc extinguishing chamber 3 is preferably between 2 mm and 3 mm.

[0071] Further, such as Figure 5 As shown, the placement arc of the multiple arc-extinguishing grids in the second arc-extinguishing chamber 3 corresponds to the placement arc of the multiple arc-extinguishing grids in the main arc-extinguishing chamber 2, that is, the angle between the extended lines of the adjacent arc-extinguishing grids in the multiple arc-extinguishing grids in the second arc-extinguishing chamber 3 is the same as the angle between the extended lines of the adjacent arc-extinguishing grids in the multiple arc-extinguishing grids in the main arc-extinguishing chamber 2.

[0072] When the arc extinguishing chamber structure of the present application adopts a layout scheme in which the main arc extinguishing chamber 2 and the first arc extinguishing chamber 1 are arranged up and down, the arc generated by the contact mechanism enters the main arc extinguishing chamber 2 and the first arc extinguishing chamber 1. When the arc on the moving contact is not completely absorbed by the first arc extinguishing chamber 1, the arc will enter the main arc extinguishing chamber 2, and the main arc extinguishing chamber 2 will perform secondary arc extinguishing. The first arc extinguishing chamber 1 improves the arc extinguishing ability of the arc extinguishing chamber on the moving contact in the open position.

[0073] When the arc extinguishing chamber structure of the present application adopts a layout scheme in which the main arc extinguishing chamber 2 and the second arc extinguishing chamber 3 are placed in front and behind, the arc generated by the contact mechanism enters the main arc extinguishing chamber 2. When it is not completely absorbed by the main arc extinguishing chamber 2, the arc will enter the second arc extinguishing chamber 3, and the second arc extinguishing chamber 3 will perform secondary arc extinguishing. The gap between the main arc extinguishing chamber 2 and the second arc extinguishing chamber 3 will produce an effect similar to the longitudinal seam arc extinguishing, which is more conducive to the cooling and extinguishing of the arc.

[0074] Regardless of whether a top-bottom or front-to-back layout is adopted, the limited space in the arc extinguishing chamber can be utilized to increase arc extinguishing grids while utilizing the above dual arc extinguishing chamber layout to produce a better arc extinguishing effect. It should be noted that, as other embodiments, the main arc extinguishing chamber 2, the first arc extinguishing chamber 1, and the second arc extinguishing chamber 3 can also be provided simultaneously.

[0075] Preferably, Figure 2 As shown, the upper grid 13 of the first upper grid group 11 of the first arc extinguishing chamber 1 close to the contact mechanism is connected to the first arc-striking grid 14; the first grid group 21 in the main arc extinguishing chamber 2 close to the first grid 211 of the first upper grid group 11 is connected to the second arc-striking grid 24, and the second arc-striking grid 24 is connected to the first upper grid group 11.

[0076] By setting the first arc-striking grid 14, when the moving contact of the contact mechanism moves to the maximum opening distance (the moment when the moving contact and the static contact discharge), the arc is facilitated to jump from the moving contact to the first arc-extinguishing chamber 1 and be extinguished by the first arc-extinguishing chamber 1. By setting the second arc-striking grid 24 for connecting the first arc-extinguishing chamber 1 and the main arc-extinguishing chamber 2, the arc that has not been cleaned up in the first arc-extinguishing chamber 1 is facilitated to jump from the first arc-extinguishing chamber 1 to the main arc-extinguishing chamber 2 and be extinguished by the main arc-extinguishing chamber 2.

[0077] Further, Figure 13 shows a schematic structural diagram of the first arc striking grid 14, Figure 14 The schematic diagram of the structure of the second arc-starting grid 24 is shown in FIG. Figure 13 and Figure 14 As shown, the first arc-striking grid 14 includes a first arc-striking piece 141 of a square structure, and a first arc-striking portion 142 is bent and connected to the middle of one side of the first arc-striking piece 141;

[0078] The second arc-striking grid 24 includes a second arc-striking plate 241 with a square structure, and a fourth arc-guiding channel with an opening structure is provided in the middle of one side of the second arc-striking plate 241. The inner side edge 124 relative to the opening in the fourth arc-guiding channel is perpendicular to the extension direction of the grid legs 123 on both sides. The inner side edge 124 relative to the opening in the fourth arc-guiding channel is bent and connected to the second arc-striking portion 242, and the second arc-striking portion 242 is connected to the first arc extinguishing chamber 1.

[0079] By bending and connecting the first arc-striking portion 142 on the first arc-striking grid 14, the electrical gap between the first arc-striking chamber 1 and the contact mechanism can be further shortened to facilitate arc striking. By bending and connecting the second arc-striking portion 242 on the second arc-striking grid 24, the electrical gap between the first arc-striking chamber 1 and the main arc-striking chamber 2 can be further shortened. In a preferred embodiment of the present application, the second arc-striking portion 242 is connected to the first upper grid group 11 of the first arc-striking chamber 1, which is more conducive to leading the arc in the first arc-striking chamber 1 to the main arc-striking chamber 2.

[0080] Preferably, Figure 1 and Figure 4 As shown, the main arc extinguishing chamber 2 also includes main insulating side plates 25 arranged on both sides of the main arc extinguishing chamber 2, the first arc extinguishing chamber 1 also includes first insulating side plates 17 arranged on both sides of the first arc extinguishing chamber 1 and / or the second arc extinguishing chamber 3 also includes second insulating side plates 32 arranged on both sides of the second arc extinguishing chamber 3.

[0081] By arranging main insulating side plates 25 on both sides of the main arc extinguishing chamber 2, arranging first insulating side plates 17 on both sides of the first arc extinguishing chamber 1 and / or arranging second insulating side plates 32 on both sides of the second arc extinguishing chamber 3, the arc extinguishing chamber structure can be insulated and protected to prevent the high temperature of the arc from burning other components inside the circuit breaker.

[0082] Furthermore, the multiple arc-extinguishing grids in the main arc-extinguishing chamber 2 are installed on the main insulating side plates 25 on both sides, the multiple arc-extinguishing grids in the first arc-extinguishing chamber 1 are installed on the first insulating side plates 17 on both sides and / or the multiple arc-extinguishing grids in the second arc-extinguishing chamber 3 are installed on the second insulating side plates 32 on both sides.

[0083] Furthermore, the first insulating side plate 17 of the first arc extinguishing chamber 1 and the main insulating side plate 25 of the main arc extinguishing chamber 2 can be integrally formed and respectively arranged on both sides of the first arc extinguishing chamber 1 and the main arc extinguishing chamber 2 and / or the second insulating side plate 32 of the second arc extinguishing chamber 3 and the main insulating side plate 25 of the main arc extinguishing chamber 2 can be integrally formed and respectively arranged on both sides of the second arc extinguishing chamber 3 and the main arc extinguishing chamber 2. Such a design can save installation efficiency.

[0084] Further, such as Figure 7-Figure 9 As shown, first mounting structures 26 are provided on both sides of the arc-extinguishing grids in the main arc-extinguishing chamber 2, and second mounting structures are provided on the main insulating side plates on both sides of the main arc-extinguishing chamber 2. The first mounting structure 26 cooperates with the second mounting structure to fix the multiple arc-extinguishing grids in the main arc-extinguishing chamber 2 on the main insulating side plates 25.

[0085] Furthermore, the first mounting structure 26 is a boss structure, the second mounting structure is a mounting hole or a mounting groove, and the plurality of arc-extinguishing grids in the main arc-extinguishing chamber 2 are riveted to the main insulating side plate 25 through the first mounting structure 26 .

[0086] Furthermore, in the present application, one boss structure is provided on one side of the arc extinguishing grid in the main arc extinguishing chamber 2 and two boss structures are provided on the other side, and the main insulating side plate 25 is provided with a mounting hole or mounting groove matching therewith.

[0087] Further, such as Figure 12 As shown, third mounting structures 16 are provided on both sides of the upper grid 13 in the first arc-extinguishing chamber 1, and a fourth mounting structure is provided on the first insulating side plate 17. The third mounting structure 16 cooperates with the fourth mounting structure to fix the upper grid 13 in the first arc-extinguishing chamber 1 on the first insulating side plate 17; and / or fifth mounting structures are provided on both sides of the arc-extinguishing grid in the second arc-extinguishing chamber 3, and a sixth mounting structure is provided on the second insulating side plate 32. The fifth mounting structure cooperates with the sixth mounting structure to fix the arc-extinguishing grid in the second arc-extinguishing chamber 3 on the second insulating side plate 32.

[0088] Furthermore, the third mounting structure 16 or the fifth mounting structure is a boss structure, and the fourth mounting structure or the sixth mounting structure is a mounting hole or a mounting groove. In the present application, a boss structure is provided on both sides of the arc extinguishing grid in the first arc extinguishing chamber 1 and / or the second arc extinguishing chamber 3, and the first insulating side plates 17 on both sides of the first arc extinguishing chamber 1 and / or the second insulating side plates 32 on both sides of the second arc extinguishing chamber 3 are provided with mounting holes corresponding thereto.

[0089] Further, such as Figure 13 and Figure 14As shown, a third mounting structure 16 is provided on both sides of the first arc-striking grid 14, a fourth mounting structure cooperating with the third mounting structure 16 is provided on the first insulating side plate 17, a first mounting structure 26 is provided on both sides of the second arc-striking grid 24, and a second mounting structure cooperating with the first mounting structure 26 is provided on the main insulating side plate 25.

[0090] Furthermore, the third mounting structure 16, the fourth mounting structure, the first mounting structure 26 and the second mounting structure are the same as the mounting structures on the arc extinguishing grid in the first arc extinguishing chamber 1 and the main arc extinguishing chamber 2 above, that is, the third mounting structure 16 is a boss structure provided on each side of the first arc striking grid 14, and corresponding mounting holes are provided on the first insulating side plate 17. One side of the second arc striking grid 24 is provided with a boss structure and the other side is provided with two boss structures, and the main arc extinguishing grid is provided with corresponding mounting holes. The rest will not be repeated.

[0091] Preferably, Figure 5 、 Figure 6 、 Figure 10 as well as Figure 11 As shown, the main insulating side plate 25 of the main arc extinguishing chamber 2 and the first insulating side plate 17 of the first arc extinguishing chamber 1, and / or the second insulating side plate 32 of the second arc extinguishing chamber 3 are also provided with a gas-producing part 28, and the multiple arc-extinguishing grids in the main arc extinguishing chamber 2 and the first arc extinguishing chamber 1 are inserted into the gas-producing parts 28 on both sides, and / or the multiple arc-extinguishing grids in the main arc extinguishing chamber 2 and the second arc extinguishing chamber 3 are inserted into the gas-producing parts 28 on both sides.

[0092] in, Figure 6 A schematic diagram of the structure of the gas generating member 28 in a scheme in which the main arc extinguishing chamber 2 and the second arc extinguishing chamber 3 are arranged in front of each other is shown. In this scheme, the gas generating member 28 is only provided on the main insulating side plates 25 on both sides of the main arc extinguishing chamber 2. The gas generating member 28 is bonded to the main insulating side plates 25. The two gas generating members 28 on the main insulating side plates 25 on both sides are arranged opposite each other, and there is a gap between the two gas generating members 28, through which the arc can pass; Figure 10 A schematic structural diagram of the gas-producing part 28 in a scheme in which the first arc-extinguishing chamber 1 and the main arc-extinguishing chamber 2 are arranged up and down is shown. In this scheme, the gas-producing part 28 is arranged on the main insulating side plates 25 on both sides of the main arc-extinguishing chamber 2 and part of the first insulating side plates 17 on both sides of the first arc-extinguishing chamber 1. The gas-producing part 28 is fitted with the main insulating side plates 25 and the first insulating side plates 17. The two gas-producing parts 28 on both sides are arranged opposite to each other, and there is a gap between the two gas-producing parts 28, through which the arc can pass.

[0093] like Figure 5 、 Figure 6 、 Figure 10 as well as Figure 11As shown, the surface of the gas generating part 28 includes a plurality of receiving grooves 281 for accommodating arc extinguishing grids. The structure and arrangement of the plurality of receiving grooves 281 correspond to the structure and layout of the plurality of arc extinguishing grids. The thickness of the arc extinguishing grid corresponds to the height of the receiving grooves 281. The arc extinguishing grid can be partially inserted into the receiving grooves 281 and fixed by the receiving grooves 281.

[0094] The gas-producing part 28 generates gas under the high temperature erosion of the arc to further cool and accelerate the arc, and promotes the arc to move inside a plurality of arc-extinguishing grids arranged at intervals, thereby achieving the purpose of efficient arc extinguishing. The structural design of the arc-extinguishing grid inserted into the accommodating groove 281 of the gas-producing part 28 greatly reduces the distance between the arc-extinguishing grid and the gas-producing part 28, which is more conducive to the high temperature of the arc burning the gas-producing part 28 to generate gas, thereby accelerating the cooling of the arc.

[0095] Further, such as Figure 1 As shown, part of the first arc extinguishing chamber 1 can be placed in the main arc extinguishing chamber 2 and limited by the main insulating side plates 25 on both sides of the main arc extinguishing chamber 2.

[0096] Preferably, Figure 15 shows a schematic structural diagram of the base 101, Figure 16 The structure diagram of the middle cover 103 is shown in FIG. Figure 15 and Figure 16 As shown, a plurality of first limiting structures 102 are provided on the base 101, and a plurality of second limiting structures 104 are provided on the middle cover 103. Through the cooperation of the plurality of first limiting structures 102 and the plurality of second limiting structures 104, the arc extinguishing chamber structure is fixedly installed in the circuit breaker. Furthermore, the first limiting structure 102 can be a convex rib with the edges around the groove of the base 101 protruding toward the middle of the groove, and the second limiting structure 104 can be a convex rib with the edges around the groove of the middle cover 103 protruding toward the middle of the groove.

[0097] In summary, the above-mentioned arc extinguishing chamber structure includes a double arc extinguishing chamber structure in which the first arc extinguishing chamber 1 and the main arc extinguishing chamber 2 are arranged one above and one below, a double arc extinguishing chamber structure in which the main arc extinguishing chamber 2 and the second arc extinguishing chamber 3 are arranged one front and one back, and a three-arc extinguishing chamber structure of the main arc extinguishing chamber, the first arc extinguishing chamber 1 and the second arc extinguishing chamber 3 constitute a complete arc extinguishing chamber, which maximizes the use of the space of the arc extinguishing chamber, increases the number of arc extinguishing grids in the arc extinguishing chamber, increases the total surface area of ​​the arc extinguishing grids, improves the arc extinguishing ability, is conducive to lengthening the arc for arc extinguishing grid cutting, and improves the electrical life of the arc extinguishing chamber. The circuit breaker adopting the above-mentioned arc extinguishing chamber structure can increase the arc voltage and exhibit good breaking capacity, thereby improving the service life of the low-voltage electrical appliance.

[0098] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0099] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An arc extinguishing chamber structure, characterized in that: The invention comprises a main arc extinguishing chamber (2), a first arc extinguishing chamber (1) arranged above the main arc extinguishing chamber (2), and / or a second arc extinguishing chamber (3) arranged behind the main arc extinguishing chamber (2), wherein a plurality of arc extinguishing grids are arranged in the first arc extinguishing chamber (1), and a plurality of arc extinguishing grids are arranged in the second arc extinguishing chamber (3); The main arc extinguishing chamber (2) comprises a plurality of arc extinguishing grids stacked in a vertical direction, wherein the arc extinguishing grids of the main arc extinguishing chamber (2) are arranged in a staggered manner in front and back. A plurality of arc extinguishing grids in the main arc extinguishing chamber (2) are radially stacked, adjacent arc extinguishing grids intersect with the extended lines of the arc extinguishing grids at an acute angle, and the distance between adjacent arc extinguishing grids at one end close to the contact mechanism is smaller than the distance between adjacent arc extinguishing grids at one end away from the contact mechanism.

2. The arc extinguishing chamber structure according to claim 1, characterized in that: The plurality of arc extinguishing grids of the main arc extinguishing chamber (2) are at least divided into a first grid group (21), a second grid group (22) and a third grid group (23) which are arranged in sequence from top to bottom in the vertical direction, wherein the first grid group (21) includes a plurality of first grids (211), the second grid group (22) includes a plurality of second grids (221), and the third grid group (23) includes a plurality of third grids (231). The plurality of first grids (211), the plurality of second grids (221) and the plurality of third grids (231) are arranged in the vertical direction. The invention relates to a stacked arrangement, wherein the first grid piece (211), the second grid piece (221) and the third grid piece (231) all have a first arc-passing channel with an open structure in the middle, and two grid legs (123) are formed on both sides of the first arc-passing channel. All arc-extinguishing grid pieces of the second grid piece group (22) are alternately arranged in a front-to-back staggered manner, and the front-to-back staggered distance between adjacent arc-extinguishing grid pieces of the second grid piece group (22) is greater than the front-to-back staggered distance between adjacent arc-extinguishing grid pieces of the first grid piece group (21) and the third grid piece group (23).

3. The arc extinguishing chamber structure according to claim 2, characterized in that: The length of the grid leg (123) of the first grid piece (211) is smaller than the length of the grid leg (123) of the second grid piece (221); the angle between the inner side edge (124) at the opening of the first arc-running channel of the first grid piece (211) and the second grid piece (221) and the extension direction of the grid legs (123) on both sides is an acute angle or an obtuse angle, and the angle between the inner side edge (124) at the opening of the first arc-running channel of the third grid piece (231) and the extension direction of the grid legs (123) on both sides is perpendicular.

4. The arc extinguishing chamber structure according to claim 2, characterized in that: The plurality of arc-extinguishing grids in the first arc-extinguishing chamber (1) can be divided into at least a first upper grid group (11) and a second upper grid group (12); the first upper grid group (11) includes a plurality of upper grids (13) arranged in sequence along a horizontal direction, the upper grids (13) being arranged vertically; and the second upper grid group (12) includes a plurality of upper grids (13) arranged obliquely and arranged in parallel.

5. The arc extinguishing chamber structure according to claim 1, characterized in that: The included angle between adjacent arc extinguishing grids in the main arc extinguishing chamber (2) is 1°.

6. The arc extinguishing chamber structure according to claim 4, characterized in that: A second arc-running channel with an open structure is provided in the middle of the upper grid plate (13) of the first arc-extinguishing chamber (1). The second arc-running channel has a plurality of inclined surface structures therein, and the plurality of inclined surface structures form at least one tip structure (15).

7. The arc extinguishing chamber structure according to claim 6, characterized in that: The second arc passage comprises a U-shaped first notch, a second notch is provided at the bottom of the first notch, the second notch is arranged toward a side of the first notch, a triangular protruding tip structure (15) is provided in the second notch, and one corner of the triangle is protruding and inclined toward the bottom center of the first notch.

8. The arc extinguishing chamber structure according to claim 1, characterized in that: There is a gap between the main arc extinguishing chamber (2) and the second arc extinguishing chamber (3) in the horizontal direction.

9. The arc extinguishing chamber structure according to claim 4, characterized in that: The upper grid piece (13) of the first upper grid piece group (11) of the first arc extinguishing chamber (1) close to the contact mechanism is connected to a first arc striking grid piece (14); the first grid piece group (21) in the main arc extinguishing chamber (2) close to the first grid piece (211) of the first upper grid piece group (11) is connected to a second arc striking grid piece (24), and the second arc striking grid piece (24) is connected to the first upper grid piece group (11).

10. The arc extinguishing chamber structure according to claim 9, characterized in that: The first arc-striking grid (14) comprises a first arc-striking piece (141), and a first arc-striking portion (142) is bent and connected to the middle portion of one side of the first arc-striking piece (141); The second arc-striking grid (24) comprises a second arc-striking plate (241), a fourth arc-running channel with an opening structure is provided in the middle of one side of the second arc-striking plate (241), a second arc-striking portion (242) is bent and connected to the inner side edge (124) of the fourth arc-striking channel relative to the opening, and the second arc-striking portion (242) is connected to the first arc-extinguishing chamber (1).

11. The arc extinguishing chamber structure according to claim 1, characterized in that: The main arc-extinguishing chamber (2) further comprises main insulating side plates (25) arranged on both sides of the main arc-extinguishing chamber (2); the first arc-extinguishing chamber (1) further comprises first insulating side plates (17) arranged on both sides of the first arc-extinguishing chamber (1); and / or the second arc-extinguishing chamber (3) further comprises second insulating side plates (32) arranged on both sides of the second arc-extinguishing chamber (3); a plurality of arc-extinguishing grids in the main arc-extinguishing chamber (2) are mounted on the main insulating side plates (25) on both sides; a plurality of arc-extinguishing grids in the first arc-extinguishing chamber (1) are mounted on the first insulating side plates (17) on both sides; and / or a plurality of arc-extinguishing grids in the second arc-extinguishing chamber (3) are mounted on the second insulating side plates (32) on both sides.

12. The arc extinguishing chamber structure according to claim 11, characterized in that: A gas producing part (28) is further provided in the main insulating side plate (25) of the main arc extinguishing chamber (2) and the first insulating side plate (17) of the first arc extinguishing chamber (1), and / or the second insulating side plate (32) of the second arc extinguishing chamber (3); a plurality of arc extinguishing grids in the main arc extinguishing chamber (2) and the first arc extinguishing chamber (1) are inserted into the gas producing parts (28) on both sides, and / or a plurality of arc extinguishing grids in the main arc extinguishing chamber (2) and the second arc extinguishing chamber (3) are inserted into the gas producing parts (28) on both sides.

13. The arc extinguishing chamber structure according to claim 11, characterized in that: The first arc extinguishing chamber (1) is partially placed in the main arc extinguishing chamber (2) and is limited by main insulating side plates (25) on both sides of the main arc extinguishing chamber (2).

14. A circuit breaker, characterized in that: It comprises the arc extinguishing chamber structure described in any one of claims 1-13.

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