CN117524807A - Arc extinguishing chamber and circuit breaker - Google Patents

Abstract

The invention discloses an arc extinguish chamber and a circuit breaker, and relates to the technical field of piezoelectric devices. The arc extinguishing chamber comprises two arc-isolating plates which are oppositely arranged, and a first grid sheet group, a second grid sheet group and an arc striking plate which are fixed between the two arc-isolating plates, wherein the first grid sheet group and the second grid sheet 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 sheet group and the second grid sheet group, and the arc striking plate is used for introducing an electric arc segmented by the first grid sheet group into the second grid sheet group. The arc extinguishing chamber provided by the invention can accommodate more arc extinguishing grid plates at the same height, has small volume, low cost and high utilization rate of the arc extinguishing grid plates, and can improve breaking capacity and electrical service life of a circuit breaker.

Description

Arc extinguishing chamber and circuit breaker

Technical Field

The invention relates to the technical field of piezoelectric devices, in particular to an arc extinguishing chamber and a circuit breaker.

Background

The circuit breaker is used as an important element in a low-voltage electrical appliance, the performance index of the circuit breaker can restrict the development of one industry, wherein the arc extinguishing chamber is an important component of the circuit breaker, and the breaking capacity and the electrical service life of the circuit breaker are directly influenced by the arc extinguishing capacity of the circuit breaker, so that the electrical performance of the circuit breaker is determined.

In general, the more the number of arc extinguishing bars of a breaker for cutting a long arc, the higher the arc voltage, the greater the energy of the arc that can be extinguished, and the better the breaking and electrical life performance. In order to effectively improve the arc extinguishing capability of the arc extinguishing chamber, particularly to extinguish high-voltage fault current, more arc extinguishing grid plates are required to be arranged in the arc extinguishing chamber. However, the layout of the arc extinguishing gate sheets in the existing arc extinguishing chamber cannot form a reasonable conductive loop path, long arcs cannot be fully cut by the arc extinguishing gate sheets, the utilization rate of the arc extinguishing gate sheets is not high, and the volume of the arc extinguishing chamber is increased.

Disclosure of Invention

The invention aims to provide an arc-extinguishing chamber and a circuit breaker, which have the advantages of small volume, low cost and high utilization rate of arc-extinguishing grid plates, and can improve breaking capacity and electrical service life of the circuit breaker.

Embodiments of the present invention are implemented as follows:

the arc extinguishing chamber comprises two arc-isolating plates which are oppositely arranged, and a first grid sheet group, a second grid sheet group and an arc striking plate which are fixed between the two arc-isolating plates, wherein the first grid sheet group and the second grid sheet group are at least partially arranged side by side along a first direction and are 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 sheet group and the second grid sheet group, and the arc striking plate is used for introducing an electric arc which is segmented by the first grid sheet group into the second grid sheet group.

Optionally, the first grid sheet group includes a long grid sheet group and a short grid sheet group, the long grid sheet group is located below the second grid sheet group and the short grid sheet group, and the short grid sheet group and the second grid sheet group are arranged back and forth along the second direction.

Optionally, the long grating sheet group and the short grating sheet group each comprise a plurality of arc extinguishing grating sheets, the arc extinguishing grating sheets comprise an abdomen and two opposite legs connected at the same edge of the abdomen, the legs extend along a second direction, the abdomen of the long grating sheet group and the abdomen of the short grating sheet group are correspondingly arranged along a first direction, the length of the legs of the long grating sheet group is greater than that of the legs of the short grating sheet group, and the legs of the long grating sheet group extend to a rotating path of the movable contact on the movable contact.

Optionally, an insulating sleeve is further arranged between the two arc baffles, and the insulating sleeve at least partially covers the surface of the arc striking plate facing the second grid sheet group.

Optionally, the arc striking plate is Z type, including first arc striking portion, transition portion and the second arc striking portion that connects gradually, first arc striking portion is arranged in the second bars piece group and is close to the edge arc extinguishing bars piece side of first bars piece group, and second arc striking portion is arranged in the first bars piece group and is close to the edge arc extinguishing bars piece side of second bars piece group.

Optionally, the end of the first arc striking part is in a U shape, and the end of the insulating sleeve extends into a space formed by enclosing the end of the first arc striking part.

Optionally, one end of the arc striking plate is integrally arranged with an edge arc extinguishing gate sheet in the first gate sheet group, which is close to the second gate sheet group, and/or the other end of the arc striking plate is integrally arranged with an edge arc extinguishing gate sheet in the second gate sheet group, which is close to the first gate sheet group.

Optionally, the number ratio of the arc extinguishing grid plates in the first grid plate group to the second grid plate group is 1.2:1-2:1.

Optionally, the number of arc extinguishing bars in the first bar sheet group is 30, and the number of arc extinguishing bars in the second bar sheet group is 20.

Optionally, the number of arc extinguishing bars in the first bar sheet group is 14, and the number of arc extinguishing bars in the second bar sheet group is 8.

Optionally, the surface of the arc-barrier plate facing the first grid sheet set is provided with a gas generating part, and the gas generating part is arranged in a crossing way with the first grid sheet set and the second grid sheet set and surrounds the arc-striking plate.

The circuit breaker comprises a shell, an operating mechanism arranged in the shell, a moving contact, a fixed contact and any one of the arc extinguishing chambers, wherein the moving contact, the fixed contact and the arc extinguishing chambers are matched with each other, the operating mechanism is in driving connection with the moving contact to control the circuit breaker to be switched on or switched off, and the arc extinguishing chambers are positioned on the side surfaces of the switching-on and switching-off paths of the moving contact and the fixed contact.

Optionally, an air outlet plate is further arranged on the shell, the air outlet plate is located between two arc-isolating plates of the arc extinguishing chamber and perpendicular to the arc-isolating plates, a plurality of air outlet holes are formed in the air outlet plate, at least one air outlet hole is located above the arc-striking plate of the arc extinguishing chamber, and at least one air outlet hole is located below the arc-striking plate of the arc extinguishing chamber.

The beneficial effects of the embodiment of the invention include:

the arc extinguishing chamber comprises two arc-isolating plates which are oppositely arranged, and a first grid sheet group, a second grid sheet group and an arc striking plate which are fixed between the two arc-isolating plates, wherein the first grid sheet group and the second grid sheet 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 sheet group and the second grid sheet group, and the arc striking plate is used for introducing an electric arc segmented by the first grid sheet group into the second grid sheet group. According to the arc extinguishing chamber, through the staggered arrangement of the first grid plate group and the second grid plate group along the two directions, the space between the two arc baffles is fully utilized, more arc extinguishing grid plates can be contained under the same height, and the volume of the arc extinguishing chamber cannot be increased; meanwhile, the conducting loop path in the arc extinguishing chamber is optimized, so that the long arc is fully cut, the utilization rate of the arc extinguishing grid plate is improved, and the arc extinguishing effect is better. When the arc extinguishing chamber is arranged in the circuit breaker, the breaking capacity and the electric 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 needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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

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

fig. 3 is a schematic diagram of one of the motion paths of an arc in an arc extinguishing chamber according to an embodiment of the present invention;

FIG. 4 is a second motion path of an arc in an arc chute according to an embodiment of the present invention;

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

fig. 6 is a schematic structural diagram of an arc extinguishing gate of a long gate group in an arc extinguishing chamber according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an arc extinguishing gate of a short gate group in an arc extinguishing chamber according to an embodiment of the present invention;

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

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

fig. 10 is a schematic structural diagram of a gas generating member in an arc extinguishing 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 diagram of a partial structure of a circuit breaker according to an embodiment of the present invention.

Icon: 100-arc extinguishing chamber; 110-arc baffles; 120-a first set of grid plates; 121-long grid sheet group; 122-short grid sheet group; 130-a second set of gate sheets; 140-arc extinguishing grid plates; 141-abdomen; 142-leg; 143-projections; 150-an arc striking plate; 151-a first arc striking portion; 152-transition; 153-a second arc striking section; 160-insulating sleeve; 170-gas generating piece; 171-a receiving groove; 172-avoiding part; 200-a circuit breaker; 210-a housing; 220-an operating mechanism; 230-a moving contact; 240-moving contact; 250-air outlet plate; 251-an air outlet hole; 260-stationary contact.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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 apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention 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 invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

The arc extinguishing chamber is an important component of the circuit breaker, and the breaking capacity and the electric life of the circuit breaker are directly influenced by the arc extinguishing capacity of the circuit breaker, so that the electric performance of the circuit breaker is determined. The more the number of arc extinguishing bars cutting long arc in the arc extinguishing chamber is, the higher the arc voltage is, the larger the arc energy which can be extinguished is, and the better the breaking and electric life performance of the circuit breaker is. To effectively promote the quenching of the arc extinguishing chamberArc capability, particularly extinguishing high voltage fault currents, requires more arc extinguishing gate sheets to be deployed in the arc extinguishing chamber; in the prior art, arc extinguishing bars are arranged in an L shape, a C shape,The arc extinguishing bars are long, eight-shaped and the like, but the conventional arrangement mode of the arc extinguishing bars cannot form a reasonable conductive loop path, long arcs cannot be fully cut by the arc extinguishing bars, the utilization rate of the arc extinguishing bars is low, the size of an arc extinguishing chamber can be increased, and the size and the use cost of a product are further increased. In view of this, the present application is specifically proposed.

Referring to fig. 1 to 4, the present embodiment provides an arc extinguishing chamber 100, which includes two arc-shielding plates 110 disposed oppositely, and a first grid set 120, a second grid set 130 and an arc striking plate 150 fixed between the two arc-shielding plates 110, wherein the first grid set 120 and the second grid set 130 are disposed at least partially side by side along a first direction, and disposed at least partially front and back along a second direction, the second direction is perpendicular to the first direction, the arc striking plate 150 is disposed between the first grid set 120 and the second grid set 130, and the arc striking plate 150 is used for introducing an arc split by the first grid set 120 into the second grid set 130.

The circuit breaker 200 includes electrical components such as the operating mechanism 220, the moving contact 230, and the fixed contact 260, and when the moving contact 230 and the fixed contact 260 are opened, an arc is generated, and if the arc is continuously burned between the moving contact 230 and the fixed contact 260, the service lives of the moving contact 230 and the fixed contact 260 and the breaking performance of the electrical components are seriously affected. Therefore, the arc extinguishing chamber 100 is provided near the switching path between the moving contact 230 and the fixed contact 260, and the arc is introduced into the arc extinguishing chamber 100 to be extinguished.

The arc extinguishing chamber 100 provided in this embodiment includes two arc baffles 110 disposed opposite to each other, and the first grid plate set 120, the second grid plate set 130 and the arc striking plate 150 are clamped and fixed between the two arc baffles 110. The first grid set 120 and the second grid set 130 each include a plurality of arc extinguishing grid plates 140 arranged in parallel, and one ends of the plurality of arc extinguishing grid plates 140 are arranged towards the moving contact 230 so as to facilitate cutting of an electric arc generated by opening the switch, and the lengths of the plurality of arc extinguishing grid plates 140 can be equal or unequal, so that reasonable design can be performed according to the space in the arc-isolating plate 110. As shown in fig. 2, a first direction (a direction a in fig. 2) and a second direction (B direction B in fig. 2) perpendicular to each other may be defined along the surface of the arc-shaped barrier 110, and the first grid set 120 and the second grid set 130 are respectively staggered along the first direction and the second direction, that is, the orthographic projections of the first grid set 120 and the second grid set 130 on the arc-shaped barrier 110 are at least partially arranged side by side in the first direction (as indicated by a dashed line frame at C in fig. 2), and are also at least partially arranged front and back in the second direction. An arc striking plate 150 is disposed between the first and second grid sets 120 and 130, and the arc striking plate 150 extends along the sides of the first and second grid sets 120 and 130. The striking plate 150 is electrically conductive for guiding the arc motion. The arc generated when the moving contact 230 and the fixed contact 260 are separated enters the first grid plate group 120, is cut by the arc extinguishing grid plates 140 in the first grid plate group 120, moves to the second grid plate group 130 under the guidance of the arc striking plates 160, and is cut again by the arc extinguishing grid plates 140 in the second grid plate group 130. Fig. 3 shows the movement path of the arc, i.e., the path indicated by the arrow in fig. 3, when the moving contact 230 just moves to the striking plate 150 during the opening process; fig. 4 shows the movement path of the arc, i.e., the path indicated by the arrow in fig. 4, as the moving contact 230 continues to move upward, passing over the striking plate 150.

The arc extinguishing chamber 100 fully utilizes the space between the two arc baffles 110 by the staggered arrangement of the first grid plate group 120 and the second grid plate group 130 along two directions, and can accommodate more arc extinguishing grid plates 140 at the same height; meanwhile, the conductive loop path in the arc extinguishing chamber 100 is optimized, so that the long arc is fully cut, the utilization rate of the arc extinguishing grid sheet 140 is improved, and a better arc extinguishing effect is achieved. When the arc extinguishing chamber 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 5, in an alternative implementation manner of the embodiment of the present invention, the first gate set 120 includes a long gate set 121 and a short gate set 122, the long gate set 121 is located below the second gate set 130 and the short gate set 122, and the short gate set 122 and the second gate set 130 are disposed back and forth along the second direction.

The long and short gate groups 121 and 122 are distributed in a first direction (a direction in fig. 2), the second and short gate groups 130 and 122 are distributed in a second direction (B direction in fig. 2), and the length of the arc extinguishing gate 140 in the long gate group 121 is greater than the length of the arc extinguishing gate 140 in the short gate group 122 and the second gate group 130, and the lengths of the arc extinguishing gate 140 in the short gate group 122 and the second gate group 130 are equal or approximately equal, so the long gate group 121 is located below the second gate group 130 and the short gate group 122 at the same time.

Referring to fig. 6 and fig. 7 in combination, in an alternative implementation manner of the embodiment of the present invention, each of the long gate sheet set 121 and the short gate sheet set 122 includes a plurality of arc extinguishing gate sheets 140, the arc extinguishing gate sheets 140 include a web 141 and two opposite legs 142 connected at the same edge of the web 141, the legs 142 extend along a second direction, the web 141 of the long gate sheet set 121 and the web 141 of the short gate sheet set 122 are correspondingly arranged along a first direction, the length of the legs 142 of the long gate sheet set 121 is greater than the length of the legs 142 of the short gate sheet set 122, and the legs 142 of the long gate sheet set 121 extend onto a rotating path of the movable contact 240 on the movable contact 230.

The arc extinguishing grid 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 bars 140 in the long bar sheet set 121 and the short bar sheet set 122 are the same or substantially the same, and are sequentially arranged along the first direction, that is, the front projections of the belly parts of the arc extinguishing bars 140 in the long bar sheet set 121 and the short bar sheet set 122 at the bottom of the arc extinguishing chamber 100 coincide or substantially coincide. The difference in length of the arc suppressing gate 140 in the long gate stack 121 and the short gate stack 122 is mainly determined by the leg 142, and the leg 142 of the arc suppressing gate 140 in the long gate stack 121 is longer, so that the length of the arc suppressing gate 140 in the long gate stack 121 is greater than the length of the arc suppressing gate 140 in the short gate stack 122.

The legs 142 of the arc extinguishing bars 140 in the long bar set 121 extend into the rotational path of the moving contact 240, and when the moving contact 230 moves to the arc striking plate 150, the legs 142 of the arc extinguishing bars 140 in the long bar set 121 cooperate with the arc striking plate 150 to guide the arc toward the short bar set 122. Likewise, the legs 142 of the arc suppressing grid 140 in the second grid set 130 should also extend into the rotational path to the movable contact 240 to introduce an arc into the second grid set 130.

It should be noted that, the proportional relationship between the abdomen 141 and the leg 142 in the arc extinguishing gate 140 is the prior art, and this embodiment is not repeated here.

As shown in fig. 1, 5 and 6, protrusions 143 are further provided on both sides of the arc chute sheet 140, and are used for riveting with the two arc baffles 110. For example, openings are respectively formed at positions of the two arc baffles 110 corresponding to the protrusions 143, and after the protrusions 143 protrude through the openings, the protrusions 143 are riveted on the arc baffles 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 sheet 140, and the arc striking plate 150 and the insulating sleeve 160 are riveted with the arc barrier 110 through the protrusions on the side surfaces, which is not described herein.

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

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

Referring to fig. 8, in an alternative implementation manner of the embodiment of the present invention, the arc striking plate 150 is in a Z shape, and includes a first arc striking portion 151, a transition portion 152 and a second arc striking portion 153 that are sequentially connected, where the first arc striking portion 151 is located on a side surface of the second grid sheet set 130, which is close to the edge arc extinguishing grid sheet 140 of the first grid sheet set 120, and the second arc striking portion 153 is located on a side surface of the first grid sheet set 120, which is close to the edge arc extinguishing grid sheet 140 of the second grid sheet set 130.

In the first grid set 120, two arc-extinguishing grid plates 140 closest to the outer side are edge arc-extinguishing grid plates 140, one of the two edge arc-extinguishing grid plates 140 is close to the second grid set 130, and the other is far away from the second grid set 130; also, in the second grid set 130, the two arc-extinguishing grid pieces 140 closest to the outer side are edge arc-extinguishing grid pieces 140, and one of the two edge arc-extinguishing grid pieces 140 is close to the first grid set 120, and the other is far from the first grid set 120. The arc striking plate 150 is integrally Z-shaped and comprises a first arc striking part 151, a transition part 152 and a second arc striking part 153 which are sequentially connected from head to tail, wherein the first arc striking part 151 is positioned on the side surface of the second grid plate group 130, which is close to the edge arc extinguishing grid plate 140 of the first grid plate group 120, that is, in the view angle of fig. 8, the lower part of the second grid plate group 130, the second arc striking part 153 is positioned on the side surface of the first grid plate group 120, which is close to the edge arc extinguishing grid plate 140 of the second grid plate group 130, that is, in the view angle of fig. 8, the upper part of the first grid plate group 120, and the transition part 152 is positioned between the first grid plate group 120 and the second grid plate group 130. The arc striking part in the shape of Z can better separate the first grid plate group 120 from the second grid plate group 130 and extend along the side surfaces of the first grid plate group 120 and the second grid plate group 130, thereby being beneficial to fully utilizing the space between the two arc baffles 110.

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

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

Optionally, in one implementation manner of the embodiment of the present invention, one end of the arc striking plate 150 is integrally disposed with the edge arc extinguishing gate 140 of the first gate group 120 near the second gate group 130, and/or the other end of the arc striking plate 150 is integrally disposed with the edge arc extinguishing gate 140 of the second gate group 130 near the first gate group 120.

The ends of the arc striking plate 150 may be integrated with the edge arc extinguishing grid plates 140 in the first and second grid plate groups 120 and 130 to improve the arc striking effect of the arc striking plate 150. It should be appreciated that the striking plate 150 may be integrated with the edge arc chute 140 of the first set of gate sheets 120 at one end and separated from the edge arc chute 140 of the second set of gate sheets 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 gate 140 of the first gate group 120 and the other end integrated with the edge arc extinguishing gate 140 of the second gate group 130; still alternatively, the striking plate 160 may have one end integrated with the edge arc extinguishing plate 140 of the first plate group 120 and the other end integrated with the edge arc extinguishing plate 140 of the second plate group 130.

Optionally, in an implementation manner of the embodiment of the present invention, a number ratio of arc extinguishing gate sheets in the first gate sheet group and the second gate sheet group is 1.2:1-2:1. At this time, the arc extinguishing effect of the arc extinguishing chamber 100 is excellent.

When the arc voltage is higher, optionally, in an implementation manner of the embodiment of the present invention, the number of arc extinguishing bars in the first bar group is 30, and the number of arc extinguishing bars in the second bar group is 20.

When the arc voltage is low, optionally, in an implementation manner of the embodiment of the present invention, the number of arc extinguishing bars in the first bar group is 14, and the number of arc extinguishing bars in the second bar group is 8.

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

The gas generating member 170 is disposed on the surface of the arc-barrier plate 110 facing the first grid sheet set 120 and the second grid sheet set 130, a plurality of accommodating grooves 171 corresponding to the arc-extinguishing grid sheets 140 in the first grid sheet set 120 and the second grid sheet set 130 are disposed on the gas generating member 170, and the gas generating member 170 is inserted into the outer sides of the arc-extinguishing grid sheets 140 through the accommodating grooves 171 so as to realize the crossed arrangement with the first grid sheet set 120 and the second grid sheet set 130, in addition, the edge of the gas generating member 170 is further provided with an avoiding portion 172, and the avoiding portion 172 is disposed around the arc striking plate 150 so as not to influence the guiding of the arc striking plate 150 on the electric arc. The gas generating member 170 itself is capable of insulating and, upon contact with the arc, gasifying to generate gas which drives the arc into the first and second grid sets 120, 130. In practice, the gas generating member 170 is located at the side of the moving contact 230 and the fixed contact 260, so as to guide the arc movement. For example, the gas generating members 170 include two gas generating members 170 disposed opposite to each other, and the two gas generating members 170 are disposed on the two arc baffles 110, respectively, and at this time, the moving contact 230 and the fixed 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 moving contact 230, a fixed contact 260 and the arc extinguishing chamber 100 according to any one of the above, wherein the operating mechanism 220 is in driving connection with the moving contact 230 to control the circuit breaker 200 to switch on or off, and the arc extinguishing chamber 100 is located at a side of a switching path of the moving 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 reciprocally rotates to drive the moving contact 230 to contact with the static contact 260 for closing or separating. The arc extinguishing chamber 100 is arranged beside the switching-on and switching-off paths of the movable 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 moving contact 230 passes when the fixed contact 260 is switched on or off, and the arc extinguishing chamber 100 should be disposed so as not to interfere with the rotation of the moving contact 230.

Illustratively, a plurality of groups of moving contacts 230 and static contacts 260 are arranged in the shell 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 groups of moving contacts 230 and the static contacts 260; the arc extinguishing chambers 100 include a plurality, and each arc extinguishing chamber 100 is disposed corresponding to a set of the moving contact 230 and the fixed contact 260.

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

Referring to fig. 1 and fig. 5 in combination, in an alternative implementation manner of the embodiment of the present invention, an air outlet plate 250 is further provided on the housing 210, the air outlet plate 250 is located between two arc-shaped plates 110 of the arc extinguishing chamber 100 and is perpendicular to the arc-shaped plates 110, a plurality of air outlet holes 251 are provided on the air outlet plate 250, at least one air outlet hole 251 is located above the arc striking plate 150 of the arc extinguishing chamber 100, and at least one air outlet hole 251 is located below the arc striking plate 150 of the arc extinguishing chamber 100.

An air outlet plate 250 is arranged at one side of the first grid plate set 120 far away from the movable contact 230, the air outlet plate 250 is positioned between the two arc-isolating plates 110, air outlet holes 251 are arranged on the air outlet plate 250, electric arcs are cut by the first grid plate set 120 and the second grid plate set 130 to generate electric arc particles and high-pressure gas, and the electric arc particles and the high-pressure gas leave the arc extinguishing chamber 100 through the air outlet holes 251. Illustratively, the plurality of gas outlet holes 251 are distributed in a rectangular array.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. The utility model provides an explosion chamber (100), its characterized in that includes two arc baffles (110) of relative setting, and fix two first bars piece group (120), second bars piece group (130) and arc striking board (150) between arc baffles (110), first bars piece group (120) with second bars piece group (130) set up along first direction at least partially side by side, set up around at least partially along the second direction, the second direction is perpendicular to first direction, arc striking board (150) are located between first bars piece group (120) with second bars piece group (130), arc striking board (150) are used for will be cut apart through first bars piece group (120) electric arc is introduced in second bars piece group (130).

2. The arc chute (100) of claim 1 wherein said first grating set (120) comprises a long grating set (121) and a short grating set (122), said long grating set (121) being located below said second grating set (130) and said short grating set (122), said short grating set (122) being disposed back and forth along said second direction with said second grating set (130).

3. The arc chute (100) of claim 2 wherein the long (121) and short (122) gate groups each comprise a plurality of arc suppressing gate sheets (140), the arc suppressing gate sheets (140) comprise a web (141) and two oppositely disposed legs (142) connected at the same edge of the web (141), the legs (142) extend in the second direction, the web (141) of the long gate group (121) and the web (141) of the short gate group (122) are disposed in correspondence in the first direction, the length of the legs (142) of the long gate group (121) is greater than the length of the legs (142) of the short gate group (122), and the legs (142) of the long gate group (121) extend into the rotational path of the movable contact on the movable contact.

4. The arc chute (100) of claim 1 wherein an insulating sleeve (160) is further disposed between two of said arc baffles (110), said insulating sleeve (160) at least partially covering the surface of said arc striking plate (150) facing said second set of grid plates (130).

5. The arc extinguishing chamber (100) of claim 4, wherein 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 sequentially connected, the first arc striking portion (151) is located at a side surface of the second grid sheet set (130) close to an edge arc extinguishing grid sheet (140) of the first grid sheet set (120), and the second arc striking portion (153) is located at a side surface of the first grid sheet set (120) close to an edge arc extinguishing grid sheet (140) of the second grid sheet set (130).

6. The arc extinguishing chamber (100) of claim 5, wherein an end of the first arc striking portion (151) is U-shaped, and an end of the insulating sleeve (160) extends into a space defined by the end of the first arc striking portion (151).

7. The arc chute (100) of claim 1 wherein one end of the arc striking plate (150) is integrally disposed with an edge arc extinguishing gate (140) of the first gate set (120) proximate to the second gate set (130) and/or the other end of the arc striking plate (150) is integrally disposed with an edge arc extinguishing gate (140) of the second gate set (130) proximate to the first gate set (120).

8. The arc chute (100) of claim 1 wherein the number ratio of arc suppressing gate (140) in the first gate set (120) to the second gate set (130) is 1.2:1 to 2:1.

9. The arc chute (100) of claim 8 wherein the number of arc suppressing gate sheets (140) in said first gate sheet set (120) is 30 and the number of arc suppressing gate sheets (140) in said second gate sheet set (130) is 20.

10. The arc chute (100) of claim 8 wherein the number of arc suppressing gate sheets (140) in said first gate sheet set (120) is 14 and the number of arc suppressing gate sheets (140) in said second gate sheet set (130) is 8.

11. The arc chute (100) of claim 1 wherein the arc shield (110) has a gas generating member (170) disposed on a surface thereof facing the first grid set (120), the gas generating member (170) intersecting the first grid set (120) and the second grid set (130) and surrounding the arc striking plate (150).

12. A circuit breaker (200), characterized by comprising a housing (210), an operating mechanism (220) arranged in the housing (210), a moving contact (230), a fixed contact (260) and an arc extinguishing chamber (100) according to any one of claims 1 to 11, wherein the operating mechanism (220) is in driving connection with the moving contact (230) to control the circuit breaker (200) to be switched on or off, and the arc extinguishing chamber (100) is positioned on the side surface of a switching-on/off path of the moving contact (230) and the fixed contact (260).

13. The circuit breaker (200) of claim 12, wherein the housing (210) is further provided with an air outlet plate (250), the air outlet plate (250) is located between two arc-stop plates (110) of the arc extinguishing chamber (100) and is perpendicular to the arc-stop plates (110), the air outlet plate (250) is provided with a plurality of air outlet holes (251), at least one air outlet hole (251) is located above an arc striking plate (150) of the arc extinguishing chamber (100), and at least one air outlet hole (251) is located below the arc striking plate of the arc extinguishing chamber (100).