CN218730766U

CN218730766U - Arc extinguish chamber and circuit breaker

Info

Publication number: CN218730766U
Application number: CN202221960276.0U
Authority: CN
Inventors: 于贻鹏; 李生爱; 蒋武山; 黄银芳
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2023-03-24
Anticipated expiration: 2032-07-27

Abstract

The utility model discloses an explosion chamber and circuit breaker relates to low-voltage apparatus technical field. The utility model discloses an explosion chamber, including two relative flash barriers that set up to and fix first grid group, second grid group and the run-on plate between two flash barriers, first grid group and second grid group set up side by side along the first direction at least part, set up around the second direction at least part, the first direction of second direction perpendicular to, the run-on plate is located between first grid group and the second grid group, the run-on plate is used for introducing the second grid group through the electric arc after first grid group cuts apart in. The utility model provides an arc extinguishing chamber, under the same height, can hold more arc extinguishing bars piece, small, with low costs, arc extinguishing bars piece high-usage can improve the breaking capacity and the electric life-span of circuit breaker.

Description

Arc extinguish chamber and circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus technical field particularly, relates to an explosion chamber and circuit breaker.

Background

The circuit breaker is an important element in a low-voltage apparatus, and the performance index of the circuit breaker can restrict the development of an industry, wherein an arc extinguishing chamber is also an important component of the circuit breaker, and the capability of the arc extinguishing chamber directly influences the breaking capability and the electric service life of the circuit breaker to determine the electric performance of the circuit breaker.

Generally, the more the number of arc-extinguishing grid pieces of the breaker cutting long arcs is, the higher the arc voltage is, the larger the energy of the arcs capable of being extinguished is, and the better the breaking and electrical life performance is. In order to effectively improve the arc quenching capability of the arc extinguishing chamber, especially to quench high-voltage fault current, more arc extinguishing grid pieces need to be arranged in the arc extinguishing chamber. However, the layout of the arc-extinguishing grid pieces in the existing arc-extinguishing chamber cannot form a reasonable conductive loop path, long arcs cannot be sufficiently cut by the arc-extinguishing grid pieces, the utilization rate of the arc-extinguishing grid pieces is not high, and the volume of the arc-extinguishing chamber is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an explosion chamber and circuit breaker, its small, with low costs, arc extinguishing bars piece high-usage can improve the breaking capacity and the electric life-span of circuit breaker.

The embodiment of the utility model is realized like this:

the arc extinguish chamber comprises two arc isolation plates which are arranged oppositely, and a first grid group, a second grid group and an arc striking plate which are fixed between the two arc isolation plates, wherein the first grid group and the second grid group are at least partially arranged side by side along a first direction and at least partially arranged front and back along a second direction, the second direction is perpendicular to the first direction, the arc striking plate is positioned between the first grid group and the second grid group, and the arc striking plate is used for introducing electric arcs divided by the first grid group into the second grid group.

Optionally, the first grid set includes a long grid set and a short grid set, the long grid set is located below the second grid set and the short grid set, and the short grid set and the second grid set are arranged in front and back along the second direction.

Optionally, the long grid set and the short grid set both include a plurality of arc-extinguishing grids, each arc-extinguishing grid includes an abdomen and two legs connected to the same edge of the abdomen and disposed oppositely, the legs extend along the second direction, the abdomen of the long grid set and the abdomen of the short grid set are disposed correspondingly along the first direction, the length of the legs of the long grid set is greater than that of the legs of the short grid set, and the legs of the long grid set extend to the rotation path of the movable contact on the movable contact.

Optionally, an insulating sleeve is further disposed between the two arc isolating plates, and the insulating sleeve at least partially covers a surface of the arc striking plate facing the second grid group.

Optionally, the arc striking plate is Z-shaped, and includes first arc striking portion, transition portion and second arc striking portion that connect gradually, first arc striking portion is arranged in the second grid group and is close to the edge arc extinguishing bars piece side of first grid group, and second arc striking portion is arranged in the first grid group and is close to the edge arc extinguishing bars piece side of second grid group.

Optionally, the end of the first arc-striking portion is U-shaped, and the end of the insulating sleeve extends into a space formed by the end of the first arc-striking portion in a surrounding manner.

Optionally, one end of the arc striking plate is integrally disposed with the edge arc-extinguishing grid plate in the first grid plate group, which is close to the second grid plate group, and/or the other end of the arc striking plate is integrally disposed with the edge arc-extinguishing grid plate in the second grid plate group, which is close to the first grid plate group.

Optionally, the number ratio of the arc-extinguishing grid plates in the first grid plate group to the second grid plate group is 1.2.

Optionally, the number of the arc-extinguishing grid pieces in the first grid piece group is 30, and the number of the arc-extinguishing grid pieces in the second grid piece group is 20.

Optionally, the number of the arc-extinguishing grid plates in the first grid plate group is 14, and the number of the arc-extinguishing grid plates in the second grid plate group is 8.

Optionally, the surface of the arc-isolating plate facing the first grid sheet group is provided with a gas-generating piece, and the gas-generating piece, the first grid sheet group and the second grid sheet group are arranged in a crossed manner and surround the arc-striking plate.

A circuit breaker comprises a shell, an operating mechanism arranged in the shell, a movable contact, a fixed contact and an arc extinguish chamber, wherein the movable contact and the fixed contact are matched with each other, the operating mechanism is in driving connection with the movable contact to control the circuit breaker to be switched on or switched off, and the arc extinguish chamber is positioned on the side face of a switching-on/switching-off path of the movable contact and the fixed contact.

Optionally, the housing is further provided with an air outlet plate, the air outlet plate is located between the two arc baffles of the arc extinguish chamber and perpendicular to the arc baffles, the air outlet plate is provided with a plurality of air outlet holes, at least one air outlet hole is located above the arc striking plate of the arc extinguish chamber, and at least one air outlet hole is located below the arc striking plate of the arc extinguish chamber.

The utility model discloses beneficial effect includes:

the utility model provides an arc extinguish chamber, including two flash barriers that set up relatively to and fix first grid group, second grid group and the run-on plate between two flash barriers, first grid group and second grid group set up side by side along the first direction at least part, set up around the second direction at least part, the first direction of second direction perpendicular to, the run-on plate is located between first grid group and the second grid group, the run-on plate is used for introducing the second grid group through the electric arc after first grid group is cut apart in. According to the arc extinguish chamber, the first grid group and the second grid group are arranged in a staggered mode in two directions, so that the space between the two arc isolating plates is fully utilized, more arc extinguish grid pieces can be accommodated under the same height, and the size of the arc extinguish chamber cannot be increased; meanwhile, the path of a conductive loop in the arc extinguish chamber is optimized, so that the long arc is fully cut, the utilization rate of the arc extinguish grid pieces is improved, and the arc extinguish effect is better. When the arc extinguish chamber is installed in the circuit breaker, the breaking capacity and the electric service life of the circuit breaker can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an arc extinguish chamber according to an embodiment of the present invention;

fig. 2 is a second schematic structural diagram of an arc extinguish chamber according to an embodiment of the present invention;

fig. 3 is one of the moving paths of the arc in the arc-extinguishing chamber provided by the embodiment of the present invention;

fig. 4 is a second moving path of the arc in the arc extinguishing chamber according to the embodiment of the present invention;

fig. 5 is a third schematic structural diagram of an arc extinguish chamber according to an embodiment of the present invention;

fig. 6 is a schematic structural view of arc extinguishing grids of a long grid set in an arc extinguishing chamber according to an embodiment of the present invention;

fig. 7 is a schematic structural view of arc extinguishing grids of a short grid set in an arc extinguishing chamber according to an embodiment of the present invention;

fig. 8 is a fourth schematic structural diagram of an arc extinguish chamber according to an embodiment of the present invention;

fig. 9 is a fifth schematic structural diagram of an arc extinguish chamber according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a gas generating member in an arc extinguish chamber according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;

fig. 12 is a schematic partial structure diagram of a circuit breaker according to an embodiment of the present invention.

Icon: 100-an arc extinguishing chamber; 110-flash barrier; 120-a first group of louvers; 121-long grid group; 122-short group of gate tiles; 130-a second group of louvers; 140-arc extinguishing grid sheet; 141-abdomen; 142-a leg; 143-bumps; 150-arc striking plate; 151-first arc ignition portion; 152-a transition portion; 153-a second arc ignition portion; 160-insulating sleeve; 170-gas producing piece; 171-an accommodating groove; 172-an avoidance portion; 200-a circuit breaker; 210-a housing; 220-an operating mechanism; 230-moving contact; 240-moving contact; 250-gas outlet plate; 251-an air outlet; 260-static contact.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside" and "outside" are used for indicating the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the utility model is usually placed when using, and are only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The arc extinguishing chamber is an important component of the circuit breaker, and the capacity of the arc extinguishing chamber directly influences the breaking capacity and the electric service life of the circuit breaker and determines the electric performance of the circuit breaker. The more the number of arc-extinguishing grid pieces cutting long electric arcs in the arc-extinguishing chamber is, the higher the electric arc voltage is, the larger the electric arc energy which can be extinguished is, and the better the breaking and electric service life performance of the circuit breaker is. In order to effectively improve the arc quenching capability of the arc extinguishing chamber, particularly to quench high-voltage fault current, more arc extinguishing grid pieces need to be arranged in the arc extinguishing chamber; in the prior art, the arc-extinguishing grid pieces are arranged in L-, C-and L-shapes,

Type, rectangular, "eight" style of calligraphy etc, but the arrangement mode of current arc extinguishing bars piece can't form reasonable conductive loop route, and long electric arc can't be fully cut by the arc extinguishing bars piece, and the utilization ratio of arc extinguishing bars piece is not high, still can increase the volume of explosion chamber, and then has increased the size and the use cost of product. In view of this, the present application is specifically made.

Referring to fig. 1 to 4, the present embodiment provides an arc extinguish chamber 100, including two arc baffles 110 disposed opposite to each other, and a first grid set 120, a second grid set 130 and an arc guiding plate 150 fixed between the two arc baffles 110, where the first grid set 120 and the second grid set 130 are disposed at least partially side by side along a first direction, and at least partially disposed front and back along a second direction, the second direction is perpendicular to the first direction, the arc guiding plate 150 is located between the first grid set 120 and the second grid set 130, and the arc guiding plate 150 is configured to guide an arc divided by the first grid set 120 into the second grid set 130.

The circuit breaker 200 includes electrical components such as an operating mechanism 220, a movable contact 230, a fixed contact 260, and the like, and when the movable contact 230 and the fixed contact 260 are opened, an arc may be generated, and if the arc continues to burn between the movable contact 230 and the fixed contact 260, the service lives of the movable contact 230 and the fixed contact 260 and the breaking performance of the electrical components may be seriously affected. Therefore, the arc extinguishing chamber 100 is disposed beside the switching path between the moving contact 230 and the stationary contact 260, and the arc is introduced into the arc extinguishing chamber 100 to be extinguished.

The arc extinguish chamber 100 provided by the present embodiment includes two arc isolating plates 110 disposed opposite to each other, and the first group of grid plates 120, the second group of grid plates 130 and the arc striking plate 150 are clamped and fixed between the two arc isolating plates 110. The first grid set 120 and the second grid set 130 both include a plurality of arc-extinguishing grids 140 arranged in parallel, one ends of the arc-extinguishing grids 140 are arranged toward the moving contact 230, so as to cut the electric arc generated by opening, the lengths of the arc-extinguishing grids 140 may be equal or different, and the reasonable design may be performed according to the space in the arc-isolating plate 110. As shown in fig. 2, a first direction (a direction in fig. 2) and a second direction (B direction in fig. 2) perpendicular to each other may be defined along the surface of the arc barrier 110, and the first group of louvers 120 and the second group of louvers 130 are arranged in a staggered manner along the first direction and the second direction, respectively, that is, orthographic projections of the first group of louvers 120 and the second group of louvers 130 on the arc barrier 110 are at least partially arranged side by side in the first direction (as indicated by a dashed box at C in fig. 2), and are also at least partially arranged back and forth in the second direction. An arc starting plate 150 is arranged between the first grid set 120 and the second grid set 130, and the arc starting plate 150 extends along the side edges of the first grid set 120 and the second grid set 130. The arc runner 150 is capable of conducting electricity for guiding the arc motion. The arc generated when the moving contact 230 and the static contact 260 are separated enters the first grid set 120 first, is cut by the arc extinguishing grid 140 in the first grid set 120, and the cut arc moves to the second grid set 130 under the guidance of the arc striking plate 150, and is cut again by the arc extinguishing grid 140 in the second grid set 130. Fig. 3 shows the moving path of the arc when the movable contact 230 has just moved to the arc ignition plate 150 during the opening process, i.e. the path indicated by the arrow in fig. 3; fig. 4 shows the moving path of the arc when the movable contact 230 continues to move upward and passes over the arc striking plate 150, i.e. the path indicated by the arrow in fig. 4.

The arc extinguishing chamber 100 is formed by the first grid set 120 and the second grid set 130 in a staggered arrangement along two directions, so that the space between the two arc barriers 110 is fully utilized, and more arc extinguishing grid pieces 140 can be accommodated at the same height; meanwhile, the path of the conductive loop in the arc extinguish chamber 100 is optimized, so that the long arc is fully cut, the utilization rate of the arc extinguish grid pieces 140 is improved, and the arc extinguish effect is better. When the arc chute 100 is installed in the circuit breaker 200, the breaking capacity and the electrical life of the circuit breaker 200 can be improved.

Referring to fig. 2 and fig. 5, optionally, in an implementation manner of the embodiment of the present invention, the first grid set 120 includes a long grid set 121 and a short grid set 122, the long grid set 121 is located below the second grid set 130 and the short grid set 122, and the short grid set 122 and the second grid set 130 are disposed front to back along the second direction.

The long grid plate group 121 and the short grid plate group 122 are distributed along a first direction (direction a in fig. 2), the second grid plate group 130 and the short grid plate group 122 are distributed along a second direction (direction B in fig. 2), the length of the arc extinguishing grid plate 140 in the long grid plate group 121 is greater than the length of the arc extinguishing grid plate 140 in the short grid plate group 122 and the second grid plate group 130, and the lengths of the arc extinguishing grid plates 140 in the short grid plate group 122 and the second grid plate group 130 are equal or approximately equal, so that the long grid plate group 121 is simultaneously positioned below the second grid plate group 130 and the short grid plate group 122.

Referring to fig. 6 and fig. 7, optionally, in an implementation manner of the embodiment of the present invention, each of the long group of grid plates 121 and the short group of grid plates 122 includes a plurality of arc-extinguishing grid plates 140, each of the arc-extinguishing grid plates 140 includes a web portion 141 and two leg portions 142 connected to the same edge of the web portion 141 and disposed oppositely, each of the leg portions 142 extends along the second direction, the web portion 141 of the long group of grid plates 121 and the web portion 141 of the short group of grid plates 122 are disposed correspondingly along the first direction, the length of the leg portion 142 of the long group of grid plates 121 is greater than the length of the leg portion 142 of the short group of grid plates 122, and the leg portion 142 of the long group of grid plates 121 extends to a rotation path of the movable contact 240 on the movable contact 230.

The arc chute 140 includes a web 141 and a leg 142 connected to an edge of the web 141 in the second direction. The belly sizes of the arc-extinguishing grids 140 in the long grid group 121 and the short grid group 122 are the same or substantially the same, and the arc-extinguishing grids 140 are sequentially arranged along the first direction, that is, the orthographic projections of the belly of the arc-extinguishing grids 140 in the long grid group 121 and the short grid group 122 at the bottom of the arc-extinguishing chamber 100 are overlapped or substantially overlapped. The length of the arc-extinguishing grid 140 in the long grid group 121 is different from that of the arc-extinguishing grid 140 in the short grid group 122 mainly depending on the length of the leg 142, and the leg 142 of the arc-extinguishing grid 140 in the long grid group 121 is longer, so that the length of the arc-extinguishing grid 140 in the long grid group 121 is longer than that of the arc-extinguishing grid 140 in the short grid group 122.

The leg 142 of the arc chute 140 in the long chute group 121 extends to the rotation path of the movable contact 240, and when the movable contact 230 moves to the arc striking plate 150, the leg 142 of the arc chute 140 in the long chute group 121 cooperates with the arc striking plate 150 to guide the arc to the short chute group 122. Likewise, the leg 142 of the arc chute 140 of the second group 130 should also extend to the rotational path of the moving contact 240 to introduce the arc into the second group 130.

It should be noted that the proportional relationship between the abdomen 141 and the leg 142 of the arc chute 140 is the prior art, and the detailed description thereof is omitted here.

As shown in fig. 1, 5 and 6, two sides of the arc chute 140 are further provided with protrusions 143 for riveting with the two arc barriers 110. Illustratively, the two arc isolating plates 110 are respectively provided with openings corresponding to the positions of the protrusions 143, and after the protrusions 143 protrude through the openings, the protrusions 143 are riveted on the arc isolating plates 110. The fixing manner of the arc striking plate 150 and the insulating sleeve 160 is the same as that of the arc extinguishing grid 140, and the arc striking plate and the insulating sleeve are riveted with the arc isolating plate 110 through the protrusion on the side surface, which is not described herein again.

Optionally, in an achievable manner of the embodiment of the present invention, an insulating sleeve 160 is further disposed between the two arc baffles 110, and the insulating sleeve 160 at least partially covers a surface of the arc ignition plate 150 facing the second grid set 130.

The arc ignition plate 150 has two opposite surfaces, one of which faces the first group of gate plates 120 and the other of which faces the second group of gate plates 130. An insulating sleeve 160 is fixedly disposed between the two arc baffle plates 110, the insulating sleeve 160 partially or completely covers the surface of the arc ignition plate 150 facing the second grid set 130, and the surface of the arc ignition plate 150 facing the first grid set 120 is exposed. The exposed surface of the arc plate 150 is capable of conducting electricity to direct the arc toward its conductive surface, causing the arc to be more concentrated near the exposed surface of the arc plate 150 to direct the arc in the first group of louvers 120 into the second group of louvers 130.

Referring to fig. 8, optionally, in an implementation manner of the embodiment of the present invention, the arc striking plate 150 is Z-shaped, and includes a first arc striking portion 151, a transition portion 152 and a second arc striking portion 153 connected in sequence, the first arc striking portion 151 is located on the side of the edge arc extinguishing barrier 140 of the second grid set 130 close to the first grid set 120, and the second arc striking portion 153 is located on the side of the edge arc extinguishing barrier 140 of the first grid set 120 close to the second grid set 130.

In the first grid set 120, the two arc chute plates 140 closest to the outer side are the edge arc chute plates 140, one of the two edge arc chute plates 140 is close to the second grid set 130, and the other is far away from the second grid set 130; similarly, in the second group of grids 130, the two arc chute plates 140 closest to the outer side are the edge arc chute plates 140, one of the two edge arc chute plates 140 is close to the first group of grids 120, and the other is far away from the first group of grids 120. The arc striking plate 150 is overall Z-shaped, and includes a first arc striking portion 151, a transition portion 152, and a second arc striking portion 153 that are sequentially connected end to end, where the first arc striking portion 151 is located on a side surface of the second grid set 130 close to the edge arc extinguishing grid 140 of the first grid set 120, that is, in the view angle of fig. 8, below the second grid set 130, and the second arc striking portion 153 is located on a side surface of the first grid set 120 close to the edge arc extinguishing grid 140 of the second grid set 130, that is, in the view angle of fig. 8, above the first grid set 120, and the transition portion 152 is located between the first grid set 120 and the second grid set 130. The arc striking part in the shape of Z can better separate the first grid set 120 from the second grid set 130, and extend along the side surfaces of the first grid set 120 and the second grid set 130, which is beneficial to fully utilizing the space between the two arc baffles 110.

Optionally, in an implementation manner of the embodiment of the present invention, the first arc-striking portion 151 is U-shaped, and the end portion of the insulating sleeve 160 extends into the space enclosed by the first arc-striking portion 151.

The opening of the U-shaped first arc-striking portion 151 is disposed toward the insulating sleeve 160 and sleeved at the end of the insulating sleeve 160, and the U-shaped first arc-striking portion 151 can attract the arc and make the arc transfer rapidly.

Optionally, in an achievable manner of the embodiment of the present invention, one end of the arc striking plate 150 is integrally disposed with the edge arc extinguishing grid 140 in the first grid set 120, which is close to the second grid set 130, and/or the other end of the arc striking plate 150 is integrally disposed with the edge arc extinguishing grid 140 in the second grid set 130, which is close to the first grid set 120.

The end of the arc striking plate 150 may be integrated with the edge arc extinguishing grid 140 in the first and second grid sets 120 and 130 to improve the arc striking effect of the arc striking plate 150. It is understood that the arc runner 150 may be integrated with the edge-extinguishing barrier 140 of the first group of grids 120 at one end and separated from the edge-extinguishing barrier 140 of the second group of grids 130 at the other end (embodiment shown in fig. 8); alternatively, the arc striking plate 150 may have one end separated from the edge arc-extinguishing grid plate 140 of the first grid set 120 and the other end integrated with the edge arc-extinguishing grid plate 140 of the second grid set 130; still alternatively, the arc striking plate 150 may be integrated with the edge arc chute plates 140 of the first group of grid plates 120 at one end and the edge arc chute plates 140 of the second group of grid plates 130 at the other end.

Optionally, in an achievable mode of an embodiment of the present invention, the number ratio of the arc-extinguishing grid plates in the first grid plate group and the second grid plate group is 1.2. In this case, arc extinguishing effect of arc extinguishing chamber 100 is excellent.

When the arc voltage is higher, optionally, in an achievable mode of the embodiment of the present invention, the number of the arc-extinguishing grid pieces in the first grid set is 30, and the number of the arc-extinguishing grid pieces in the second grid set is 20.

When the arc voltage is lower, optionally, in an achievable mode of the embodiment of the present invention, the number of the arc-extinguishing grid plates in the first grid plate group is 14, and the number of the arc-extinguishing grid plates in the second grid plate group is 8.

Referring to fig. 3, 9 and 10, optionally, in an implementation manner of the embodiment of the present invention, the surface of the arc baffle 110 facing the first grid set 120 is provided with a gas generating member 170, and the gas generating member 170 is disposed to intersect with the first grid set 120 and the second grid set 130 and surround the arc striking plate 150.

The gas generating component 170 is disposed on the surface of the arc baffle 110 facing the first grid set 120 and the second grid set 130, the gas generating component 170 is provided with a plurality of accommodating grooves 171 corresponding to the arc extinguishing grids 140 in the first grid set 120 and the second grid set 130, the gas generating component 170 is inserted outside the arc extinguishing grids 140 through the accommodating grooves 171 to realize the cross arrangement with the first grid set 120 and the second grid set 130, in addition, the edge of the gas generating component 170 is further provided with an avoiding portion 172, and the avoiding portion 172 is disposed around the arc guiding plate 150 to avoid influencing the guiding of the arc guiding plate 150 to the arc. The gas generating member 170 itself can perform an insulating function, and when contacting the arc, the gas is generated by gasification, and drives the arc into the first and second grid sets 120 and 130. In practice, the gas generating member 170 is located at the side of the moving contact 230 and the stationary contact 260 so as to guide the arc motion. For example, the gas generating members 170 include two oppositely disposed gas generating members 170, and the two gas generating members 170 are disposed on the two arc isolating plates 110, respectively, and then the moving contact 230 and the stationary contact 260 should be located between the two gas generating members 170.

Referring to fig. 3, 11 and 12, the present embodiment further provides a circuit breaker 200, which includes a housing 210, an operating mechanism 220 disposed in the housing 210, a movable contact 230, a fixed contact 260 and the arc extinguish chamber 100 as described above, wherein the operating mechanism 220 is in driving connection with the movable contact 230 to control the circuit breaker 200 to close or open, and the arc extinguish chamber 100 is located on a side of a closing/opening path of the movable contact 230 and the fixed contact 260.

The operating mechanism 220 is rotatably disposed in the housing 210 and is in driving connection with the moving contact 230, and the operating mechanism 220 rotates back and forth to drive the moving contact 230 to contact with the stationary contact 260 for closing or separating. The arc extinguishing chamber 100 is arranged beside the switching-on and switching-off path of the moving contact 230 and the fixed contact 260, and the electric arc generated by switching-off enters the arc extinguishing chamber 100 to be cut. It should be understood that the switching path refers to a path that the movable contact 230 traces when the stationary contact 260 is switched on or switched off, and the arc extinguishing chamber 100 should be disposed so as not to interfere with the rotation of the movable contact 230.

Illustratively, a plurality of sets of moving contacts 230 and fixed contacts 260 are arranged in the housing 210 side by side, and the plurality of moving contacts 230 are simultaneously in driving connection with the operating mechanism 220, so as to realize simultaneous closing or simultaneous opening of the plurality of sets of moving contacts 230 and fixed contacts 260; the arc-extinguishing chamber 100 includes a plurality of arc-extinguishing chambers 100, and each arc-extinguishing chamber 100 is disposed corresponding to a set of movable contacts 230 and fixed contacts 260.

The circuit breaker 200 includes the same structure and advantageous effects as the arc chute 100 in the foregoing embodiment. The structure and advantageous effects of the arc chute 100 have been described in detail in the foregoing embodiments, and are not described in detail herein.

Referring to fig. 1 and fig. 5, optionally, in an implementation manner of the embodiment of the present invention, a gas outlet plate 250 is further disposed on the housing 210, the gas outlet plate 250 is located between the two arc baffles 110 of the arc extinguish chamber 100 and perpendicular to the arc baffles 110, a plurality of gas outlets 251 are disposed on the gas outlet plate 250, at least one of the gas outlets 251 is located above the arc ignition plate 150 of the arc extinguish chamber 100, and at least one of the gas outlets 251 is located below the arc ignition plate 150 of the arc extinguish chamber 100.

An air outlet plate 250 is arranged on one side of the first grid set 120 away from the movable contact 230, the air outlet plate 250 is located between the two arc baffles 110, an air outlet hole 251 is arranged on the air outlet plate 250, the electric arc is cut by the first grid set 120 and the second grid set 130 to generate electric arc particles and high-pressure gas, and the electric arc particles and the high-pressure gas leave the arc extinguish chamber 100 through the air outlet hole 251. Illustratively, the plurality of air outlets 251 are distributed in a rectangular array.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The arc extinguishing chamber (100) is characterized by comprising two arc baffles (110) which are arranged oppositely, and a first grid group (120), a second grid group (130) and an arc striking plate (150) which are fixed between the two arc baffles (110), wherein the first grid group (120) and the second grid group (130) are at least partially arranged side by side along a first direction and at least partially arranged front and back along a second direction, the second direction is perpendicular to the first direction, the arc striking plate (150) is positioned between the first grid group (120) and the second grid group (130), and the arc striking plate (150) is used for introducing electric arcs divided by the first grid group (120) into the second grid group (130).

2. The arc chute (100) of claim 1, wherein the first group of grid plates (120) comprises a long group of grid plates (121) and a short group of grid plates (122), the long group of grid plates (121) is located below the second group of grid plates (130) and the short group of grid plates (122), and the short group of grid plates (122) and the second group of grid plates (130) are arranged in front of each other along the second direction.

3. Arc chute (100) according to claim 2, characterized in that said long group of grids (121) and said short group of grids (122) each comprise a plurality of grids (140), said grids (140) comprising a web (141) and two oppositely arranged legs (142) connected at the same edge of said web (141), said legs (142) extending along said second direction, said web (141) of said long group of grids (121) and said web (141) of said short group of grids (122) being arranged in correspondence along said first direction, said legs (142) of said long group of grids (121) having a length greater than the length of the legs (142) of said short group of grids (122), and said legs (142) of said long group of grids (121) extending onto the rotation path of the movable contacts on the movable contacts.

4. Arc extinguishing chamber (100) according to claim 1, characterized in that an insulating sleeve (160) is further provided between the two arc baffles (110), and the insulating sleeve (160) at least partially covers the surface of the arc ignition plate (150) facing the second group of grids (130).

5. The arc extinguishing chamber (100) according to claim 4, characterized in that the arc striking plate (150) is Z-shaped and comprises a first arc striking portion (151), a transition portion (152) and a second arc striking portion (153) which are connected in sequence, the first arc striking portion (151) is located on the side of the edge arc extinguishing grid plate (140) of the second grid plate group (130) close to the first grid plate group (120), and the second arc striking portion (153) is located on the side of the edge arc extinguishing grid plate (140) of the first grid plate group (120) close to the second grid plate group (130).

6. The arc extinguishing chamber (100) according to claim 5, characterized in that the end of the first arc ignition portion (151) is U-shaped, and the end of the insulating sleeve (160) extends into the space enclosed by the end of the first arc ignition portion (151).

7. The arc chute (100) according to claim 1, characterized in that one end of the arc striking plate (150) is integrally disposed with the edge arc chute plate (140) of the first group of grids (120) close to the second group of grids (130), and/or the other end of the arc striking plate (150) is integrally disposed with the edge arc chute plate (140) of the second group of grids (130) close to the first group of grids (120).

8. The arc chute (100) according to claim 1, characterized in that the number ratio of arc chute sheets (140) in the first and second group of grid sheets (120, 130) is 1.2.

9. The arc chute (100) according to claim 8, characterized in that the number of arc chute plates (140) in the first group of grid plates (120) is 30, and the number of arc chute plates (140) in the second group of grid plates (130) is 20.

10. The arc chute (100) according to claim 8, characterized in that the number of arc chute plates (140) in the first group of grid plates (120) is 14, and the number of arc chute plates (140) in the second group of grid plates (130) is 8.

11. Arc extinguishing chamber (100) according to claim 1, characterized in that the surface of the arc barrier (110) facing the first group of grids (120) is provided with a gas generating member (170), the gas generating member (170) being arranged crosswise to the first group of grids (120) and the second group of grids (130) and surrounding the arc ignition plate (150).

12. A circuit breaker (200), comprising a housing (210), an operating mechanism (220) disposed in the housing (210), a movable contact (230), a fixed contact (260), and the arc extinguish chamber (100) according to any one of claims 1 to 11, wherein the movable contact (230) is in driving connection with the operating mechanism (220) to control the circuit breaker (200) to be switched on or switched off, and the arc extinguish chamber (100) is located at a side of a switching path between the movable contact (230) and the fixed contact (260).

13. The circuit breaker (200) according to claim 12, wherein an air outlet plate (250) is further disposed on the housing (210), the air outlet plate (250) is disposed between two arc baffles (110) of the arc extinguish chamber (100) and perpendicular to the arc baffles (110), a plurality of air outlet holes (251) are disposed on the air outlet plate (250), at least one of the air outlet holes (251) is disposed above an arc ignition plate (150) of the arc extinguish chamber (100), and at least one of the air outlet holes (251) is disposed below the arc ignition plate of the arc extinguish chamber (100).