CN219626580U

CN219626580U - Arc extinguishing chamber

Info

Publication number: CN219626580U
Application number: CN202320207313.9U
Authority: CN
Inventors: 胡毓哈; 文祥; 周望坤; 李盛炎; 蔡朦朦; 叶涛
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2023-02-10
Filing date: 2023-02-10
Publication date: 2023-09-01
Anticipated expiration: 2033-02-10

Abstract

The arc extinguishing chamber comprises an arc extinguishing chamber and a first arc striking piece, a plurality of arc extinguishing grid pieces with opposite intervals are assembled between an arc inlet and an exhaust outlet of the arc extinguishing chamber, the first arc striking piece extends from the arc inlet of the arc extinguishing chamber to the arc extinguishing chamber and is limited in the arc extinguishing chamber, the first arc striking piece is opposite to the plate surface of the arc extinguishing grid pieces at intervals, a pair of gas generating pieces distributed on two sides of the arc inlet are further arranged in the arc extinguishing chamber, and each gas generating piece is fixedly connected with the first arc striking piece and/or the arc extinguishing grid pieces in an inserting mode in the arc extinguishing chamber. According to the arc extinguishing chamber, the first arc striking piece and the arc extinguishing grid piece are assembled in the arc extinguishing chamber, and the gas generating piece is fixedly connected to the two sides of the arc inlet in an inserting mode through the first arc striking piece and/or the arc extinguishing grid piece, so that the assembling operation in the arc extinguishing chamber is simplified, and the layout in the arc extinguishing chamber is more reasonable.

Description

Arc extinguishing chamber

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to an arc extinguishing chamber.

Background

A circuit breaker is a switching device for switching off and on a load circuit, and switching off a fault circuit to prevent an accident from being enlarged, thereby securing a safe operation of the load circuit. Since the breaking capacity of the circuit breaker is an important index for judging the safety and reliability of the circuit breaker, namely, whether an arc generated between a moving contact and a fixed contact can be rapidly extinguished when the circuit breaker breaks is one of factors affecting the breaking capacity.

The explosion chamber is used as an important component of the universal circuit breaker, plays a role in arc striking and extinguishing, is generally provided with a gas generating part near an arc inlet of the existing explosion chamber, generates gas at high temperature by the gas generating part to push the arc to accelerate into the arc extinguishing chamber, but because of the assembly positions and the layout structure of a plurality of arc extinguishing grid sheets, the existing gas generating part is required to be provided with an independent assembly structure, so that the assembly operation of the explosion chamber is more complicated.

Disclosure of Invention

The object of the present utility model is to overcome at least one of the drawbacks of the prior art and to provide an arc chute.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the arc extinguishing chamber comprises an arc extinguishing chamber and a first arc striking piece, a plurality of arc extinguishing grid pieces with opposite intervals are assembled between an arc inlet and an exhaust outlet of the arc extinguishing chamber, the first arc striking piece extends from the arc inlet of the arc extinguishing chamber to the arc extinguishing chamber and is limited in the arc extinguishing chamber, the first arc striking piece is opposite to the plate surface of the arc extinguishing grid pieces at intervals, a pair of gas generating pieces distributed on two sides of the arc inlet are further arranged in the arc extinguishing chamber, and each gas generating piece is fixedly connected with the first arc striking piece and/or the arc extinguishing grid pieces in an inserting mode in the arc extinguishing chamber.

Preferably, the arc-extinguishing grid piece comprises a second arc-extinguishing grid piece, a second arc-extinguishing groove is formed in one end of the second arc-extinguishing grid piece, two sides of the second arc-extinguishing groove extend to form an extension part, and the extension part and the first arc striking piece are connected with the gas generating piece in an inserting mode.

Preferably, the first end of the first striking piece extends into the striking cavity and is opposite to the arc extinguishing grid piece at intervals, the second end of the first striking piece is bent and extended to form a connecting portion which is spliced with the gas generating piece, the connecting portion extends along the plane where the arc inlet is located and seals a part of the area where the arc inlet is located, and the plane where the connecting portion is located and the plane where the arc extinguishing grid piece are located are arranged at an included angle.

Preferably, one end protrusion that every produces gas spare and is close to first striking piece is equipped with spacing boss, and the mating surface of two spacing bosss sets up relatively and has seted up a first slot respectively, and the plane that first slot place is perpendicular with the lateral wall in arc extinguishing chamber, and the linking portion is pegged graft in first slot, produces gas spare in spacing boss one side and is equipped with at least one second slot that is used for pegging graft with the arc extinguishing bars piece.

Preferably, the pair of limiting bosses are inclined tables, the pair of matching surfaces are inclined surfaces, the distance between the pair of limiting bosses is gradually reduced to form a horn mouth, the narrowest area of the horn mouth corresponds to the middle part of the arc inlet, and the widest area of the horn mouth corresponds to one end of the arc inlet, which is close to the first arc striking piece.

Preferably, the width of the narrowest area of the bell mouth is more than or equal to one third of the opening interval of the second arc extinguishing groove, and the width of the widest area of the bell mouth is less than or equal to four fifths of the width of the first arc striking plate.

Preferably, a pair of lateral wall avris of arc extinguishing chamber has offered first assembly groove and second assembly groove respectively, and the both sides side limit of connecting between first end and the second end of first striking piece is pegged graft respectively and is limited to be located a pair of first assembly groove, and the second assembly groove is located the both sides of income arc mouth respectively, and every gas production piece laminating sets up in a second assembly groove, makes the body of gas production piece and the lateral wall of arc extinguishing chamber remain level.

Preferably, the middle part of each gas generating member is provided with at least one second slot, and the second slots are in plug-in fit with the edges of the extension parts.

Preferably, the device further comprises a second arc striking piece, at least one flame extinguishing piece, a metal screen plate and a cover plate, wherein the second arc striking piece extends from the arc inlet to the arc extinguishing cavity, a plurality of arc extinguishing grid pieces are positioned between the first arc striking piece and the second arc striking piece, and the flame extinguishing piece, the metal screen plate and the cover plate are sequentially overlapped and covered on the exhaust port.

Preferably, the arc extinguishing chamber is formed by a pair of parallel opposite arc extinguishing walls, one end butt joint of a pair of arc extinguishing walls forms the diapire of arc extinguishing chamber the gas vent has been seted up at the diapire middle part of arc extinguishing chamber, and the one end of the arc extinguishing chamber opposite with the gas vent is the income arc mouth, has seted up a plurality of constant head tanks of interval arrangement at the arc extinguishing wall, and a plurality of arc extinguishing bars piece correspond the assembly with a plurality of constant head tanks respectively, the arc extinguishing wall still has seted up first assembly groove and the second assembly groove that are used for assembling first striking piece and gas production spare respectively, the second assembly groove is located the arc extinguishing wall region that is close to the income arc mouth, and first assembly groove is including the spacing section of first spacing section of intercommunication and second spacing section, first spacing section sets up along the avris of arc extinguishing wall and is opposite with a plurality of constant head tank intervals, and the second spacing section is buckled to the middle part direction that is close to the arc extinguishing mouth, and second spacing section and second assembly groove intercommunication.

According to the arc extinguishing chamber, the first arc striking piece and the arc extinguishing grid piece are assembled in the arc extinguishing chamber, and the gas generating piece is fixedly connected to the two sides of the arc inlet in an inserting mode through the first arc striking piece and/or the arc extinguishing grid piece, so that the assembling operation in the arc extinguishing chamber is simplified, and the layout in the arc extinguishing chamber is more reasonable.

In addition, the second arc extinguishing grid piece and the first arc striking piece are inserted into the gas generating piece, so that the gas generating piece is stably assembled in the arc extinguishing cavity.

In addition, the first arc striking piece is provided with a connecting part which is spliced with the gas generating piece, and the connecting part can cover part of the arc inlet, so that the arc generated by the contact mechanism can be introduced into the arc extinguishing cavity.

In addition, the gas production piece is provided with a limiting boss, the distance between a pair of limiting bosses is gradually reduced to form a horn mouth, and the horn mouth and the first striking piece are matched to facilitate the introduction of an arc into the arc extinguishing cavity.

Drawings

Fig. 1 is a schematic view of the internal structure of an arc extinguishing chamber according to the present utility model;

fig. 2 is a schematic structural view of an arc extinguishing chamber according to the present utility model;

FIG. 3 is a partially enlarged schematic view of portion D of FIG. 2;

fig. 4 is a schematic structural view of a side of the arc extinguishing chamber provided with a first striking plate in the present utility model;

fig. 5 is a side view of the arc chute of the present utility model;

fig. 6 is an exploded view of the arc chute, arc chute sheet and limiter of the present utility model;

fig. 7 is an exploded view of the arc chute, gas generating member, second arc chute sheet and first arc striking sheet of the present utility model;

fig. 8 is a schematic structural view of a pair of arc extinguishing walls in the present utility model;

FIG. 9 is a schematic view of a pair of gas generating members according to the present utility model;

FIG. 10 is a schematic view of the structure of a first striking plate according to the present utility model;

fig. 11 is a schematic structural view of a first arc chute sheet according to the present utility model;

fig. 12-13 are schematic structural views of a second arc chute sheet according to the present utility model;

FIG. 14 is a schematic view of the structure of the stopper according to the present utility model;

reference numerals: 1-arc extinguishing wall, 11-positioning groove, 12-first limit groove, 13-first assembly groove, 14-second assembly groove, 2-arc extinguishing grid piece, 201-notch, 202-clamping groove, 21-first arc extinguishing grid piece, 211-first arc extinguishing groove, 22-second arc extinguishing grid piece, 221-second arc extinguishing groove, 222-extension part, 3-gas generating piece, 31-limit boss, 311-matching surface, 312-first slot, 32-second slot, 4-first arc striking piece, 41-notch, 42-connection part, 5-second arc striking piece, 6-limit piece, 7-flame extinguishing piece, 81-metal screen, 82-shaft lever, 9-cover plate, A-movable contact and B-stationary contact.

Detailed Description

Embodiments of the arc chute of the present utility model are further described below with reference to the examples shown in the drawings. The arc extinguishing chamber of the present utility model is not limited to the description of the following embodiments.

The arc extinguishing chamber of the embodiment comprises a pair of parallel and opposite arc extinguishing walls 1, a plurality of arc extinguishing grid plates 2, at least one flame extinguishing plate 7, a metal screen 81 and a cover plate 9, wherein a space between the pair of arc extinguishing walls 1 is used as an arc extinguishing chamber, at least one end of the arc extinguishing chamber is opened to be used as an arc inlet, and the other end of the arc extinguishing chamber opposite to the arc inlet is provided with an exhaust port; the arc extinguishing bars 2 are arranged in an arc extinguishing cavity between the arc inlet and the exhaust outlet at intervals, the first end of each arc extinguishing bar 2 corresponds to the exhaust outlet, the second end of each arc extinguishing bar 2 corresponds to the arc inlet, at least one flame extinguishing plate 7, the metal screen 81 and the cover plate 9 are arranged outside the arc extinguishing cavity, the cover plate 9 is fixedly connected with the arc extinguishing wall 1, so that the flame extinguishing plates 7 and the metal screen 81 are laminated between the cover plate 9 and the exhaust outlet, and the metal screen 81 is closer to the cover plate 9; the arc extinguishing chamber further comprises an arc striking sheet extending from the arc inlet to the arc extinguishing chamber, when the arc extinguishing chamber is assembled in the circuit breaker, the arc inlet of the arc extinguishing chamber is connected with the contact mechanism, an arc generated by breaking of the contact mechanism enters the arc extinguishing chamber from the arc inlet under the cooperation of the arc striking sheet, and is discharged from the exhaust port after being cut and cooled by the arc extinguishing gate sheet 2; the arc extinguishing chamber is internally provided with gas generating pieces 3, the gas generating pieces 3 are arranged on two sides of the arc inlet in pairs, and when an electric arc enters the arc extinguishing chamber, the gas generating pieces 3 generate gas at the high temperature of the electric arc so as to push the electric arc into the arc extinguishing chamber.

The utility model has the improvement that the first arc striking plate 4 is limited in the arc extinguishing cavity, and the pair of gas generating pieces 3 distributed on two sides of the arc inlet are respectively spliced with the first arc striking plate 4 and/or the arc extinguishing grid plate 2, so that the structure simplifies the assembly operation of the arc extinguishing chamber and ensures that the layout of the interior of the arc extinguishing cavity is more reasonable.

Preferably, the arc extinguishing grid piece 2 comprises a second arc extinguishing grid piece 22, the second end of the second arc extinguishing grid piece 22 corresponds to the arc inlet and is provided with an extension part 222, and the extension part 222 and the first arc striking piece 4 are both spliced with the gas generating piece 3, so that the gas generating piece 3 is more favorably ensured to be stably assembled in the arc extinguishing cavity.

Further, the second end of the first striking plate 4 is bent and extended to form a connecting part 42 which is spliced with the gas generating part 3, the connecting part 42 extends along the plane of the arc inlet and seals a part area of the arc inlet, and the plane of the connecting part 42 and the plane of the arc extinguishing grid plate 2 are arranged at an included angle, so that the gas generating part 3 is spliced and fixed by the first striking plate 4 and the second arc extinguishing grid plate 22 from two directions, and the stable assembly of the gas generating part 3 is further ensured.

In combination with fig. 1-14, a specific embodiment of an arc extinguishing chamber is provided, the arc extinguishing chamber comprises a pair of arc extinguishing walls 1, a plurality of arc extinguishing grid plates 2, a first arc striking plate 4, a second arc striking plate 5 and a pair of gas generating pieces 3, the pair of arc extinguishing walls 1 are parallel and opposite in interval, one ends of the pair of arc extinguishing walls 1 are parallel and opposite in interval, a space between the pair of arc extinguishing walls 1 serves as an arc extinguishing cavity, the other ends of the pair of arc extinguishing walls 1 are in butt joint to form a bottom wall of the arc extinguishing cavity, an exhaust port communicated with the arc extinguishing cavity is formed in the middle of the bottom wall of the arc extinguishing cavity, in this embodiment, two sides of one end of each arc extinguishing wall 1 are provided with a pair of parallel and opposite supporting walls, the pair of supporting walls extend along a plate surface perpendicular to the arc extinguishing walls 1 to form a U-shaped groove with an opening far away from the arc extinguishing walls 1, when the pair of arc extinguishing walls 1 are parallel and opposite in interval, the two U-shaped grooves are in butt joint to form an exhaust port communicated with the arc extinguishing cavity, the other end opposite to the exhaust port is an arc inlet, and the arc inlet is opposite to the exhaust port.

As shown in fig. 1-3, 7 and 8, a plurality of positioning grooves 11 are formed in the side wall of the arc extinguishing chamber at intervals, the positioning grooves 11 are located between the arc inlet and the air outlet, in fig. 7 and 8, a plurality of parallel strip-shaped grooves are formed in the side wall of each arc extinguishing wall 1, the strip-shaped grooves serve as the positioning grooves 11 and are respectively parallel to the central axes of the arc inlet and the air outlet, a plurality of arc extinguishing grid plates 2 are assembled in the positioning grooves 11 in a one-to-one correspondence manner, namely, the edge of each arc extinguishing grid plate 2 connected between the first end and the second end is clamped with the positioning groove 11, the plate surface of each arc extinguishing grid plate 2 is perpendicular to the plate surface of the arc extinguishing wall 1, the plate surfaces of two adjacent arc extinguishing grid plates 2 are parallel and opposite, a gap reserved between the two adjacent arc extinguishing grid plates 2 is an arc channel, and two ends of each arc channel are respectively opposite to the arc inlet and the air outlet.

As shown in fig. 1-7 and 11-13, the first end of the arc extinguishing grating sheet 2 corresponds to the exhaust port of the arc extinguishing chamber, the second end of the arc extinguishing grating sheet 2 corresponds to the arc inlet, the arc extinguishing grating sheet 2 comprises a plurality of first arc extinguishing grating sheets 21 and at least one second arc extinguishing grating sheet 22, the second end of the first arc extinguishing grating sheet 21 is provided with a first arc extinguishing groove 211, preferably, the first arc extinguishing grating sheet 21 is provided with a first eccentric arc extinguishing groove 211, the eccentric direction of at least one first arc extinguishing groove 211 is different from the eccentric direction of other first arc extinguishing grooves 211, the second end of the second arc extinguishing grating sheet 22 is provided with a second arc extinguishing groove 221, in this embodiment, the arc extinguishing grating sheet 2 comprises two second arc extinguishing grating sheets 22, the second end of each second arc extinguishing grating sheet 22 is provided with an extending part 222, the extending part 222 extends from two sides of the second arc extinguishing grooves 221 to the direction of the arc inlet, and the extending part 222 of the two second arc extinguishing grating sheets 22 extends into the arc inlet.

In addition, the first arc-extinguishing gate sheets 21 may be disposed between two adjacent second arc-extinguishing gate sheets 22, and the number of the first arc-extinguishing gate sheets 21 may be 1, 2 or more, and of course, the first arc-extinguishing gate sheets 21 may not be disposed between two adjacent second arc-extinguishing gate sheets 22.

In combination with fig. 5, 6 and 11-13, a specific structure of the arc-extinguishing grid plates 2 is provided, in this embodiment, the arc-extinguishing grid plates 2 are in a plate-shaped structure as a whole, two side edges of the second end of each arc-extinguishing grid plate 2 are provided with clamping grooves 202, the clamping grooves 202 enable two side edges of each arc-extinguishing grid plate 2 to form step surfaces, and the step surfaces can be clamped into the positioning grooves 11; in this embodiment, the notches 201 are rectangular open grooves formed on the step surface, and all the notches 201 may be communicated to form a second limit groove in a straight line, and the second limit groove may be butted with the first limit groove 12 to form a limit groove.

Specifically, in this embodiment, the length of the first arc-extinguishing grating sheet 21 is smaller than that of the second arc-extinguishing grating sheet 22, when the first end of the first arc-extinguishing grating sheet 21 is kept flush with the first end of the second arc-extinguishing grating sheet 22, the second end of the first arc-extinguishing grating sheet 21 is far away from the arc inlet compared with the second arc-extinguishing grating sheet 22, the second end of the first arc-extinguishing grating sheet 21 is provided with the first arc-extinguishing groove 211, the first arc-extinguishing groove 211 comprises a first open groove, the opening of the first open groove is located at the edge of the second end of the first arc-extinguishing grating sheet 21, the side wall end parts of the two sides of the first open groove are in sharp angles, the middle part of the groove bottom of the first open groove is provided with a V-shaped second open groove, the groove is provided with an eccentric groove, and the central axis of the eccentric groove deviates from the central axis of the first arc-extinguishing grating sheet 21.

A second arc extinguishing groove 221 with a V shape is formed at the second end of the second arc extinguishing gate 22, the opening space of the second arc extinguishing groove 221 is smaller than the opening space of the first arc extinguishing groove 211, and in this embodiment, the inner diameter of the first groove is larger than the inner diameter of the second arc extinguishing groove 221; the side wall ends at two sides of the second arc-extinguishing groove 221 extend to form the extending parts 222, each extending part 222 is wrapped in the gas generating part 3, in this embodiment, each extending part 222 is in plug connection with the gas generating part 3, the first arc-extinguishing grid piece 21 and the second arc-extinguishing grid piece 22 are assembled in the arc-extinguishing cavity, the bottom of the first arc-extinguishing groove 211 is far away from the arc inlet than the bottom of the second arc-extinguishing groove 221, that is, in fig. 5 and 6, the bottom of the first arc-extinguishing groove 221 is higher than the bottom of the second arc-extinguishing groove 222, in this embodiment, the side wall ends at two sides of the first opening groove of the first arc-extinguishing groove 221 are located above the gas generating part 3, at this time, the first arc-extinguishing grid piece 21 is not in plug connection with the gas generating part 3, but the first arc-extinguishing grid piece 21 can be plug connection with the gas generating part 3 by extending the side walls at two sides of the first opening groove.

As shown in fig. 1, 2, 4, 5 and 7, the first striking plate 4 and the second striking plate 5 extend into the arc extinguishing chamber from two sides of the arc inlet respectively, that is, the first ends of the first striking plate 4 and the second striking plate 5 are close to the exhaust port of the arc extinguishing chamber, the second ends of the first striking plate 4 and the second striking plate 5 are matched with the arc inlet, a plurality of arc extinguishing grid plates 2 are positioned between the first striking plate 4 and the second striking plate 5, the faces of the first striking plate 4 and the second striking plate 5 are opposite to the faces of the plurality of arc extinguishing grid plates 2 respectively, wherein the first striking plate 4 corresponds to one side of a moving contact a of the contact mechanism, and the second striking plate 5 corresponds to one side of a fixed contact B of the contact mechanism. The first striking piece 4 is close to the opening position of the moving contact A, and the second striking piece 5 can be electrically connected with the fixed contact B.

Preferably, as shown in fig. 1, 2, 4-6 and 8, in this embodiment, the widths of the first striking plate 4 and the second striking plate 5 are matched with the interval between the pair of arc extinguishing walls 1, two sides of the arc extinguishing cavity are closed by the first striking plate 4 and the second striking plate 5, further, a first assembling groove 13 for limiting the first striking plate 4 may be further arranged on the arc extinguishing wall 1, and the first assembling groove 13 is arranged along the side position of the arc extinguishing wall 1 to ensure that the first striking plate 4 is stably connected with the side wall of the arc extinguishing cavity, as shown in fig. 4, 5, 7, 8 and 10, in this embodiment, two side edges connected between the first end and the second end of the first striking plate 4 are respectively inserted and limited in the pair of first assembling grooves 13; the notch 41 is formed at the first end of the first striking plate 4, preferably, the opening interval of the notch 41 is equal to the opening interval of the second arc extinguishing groove 221, the notch 41 is matched with the side wall of the arc extinguishing cavity to form an air guiding notch, the arc extinguishing cavity is communicated with the outside, the second end of the first striking plate 4 is bent and extended to form the connecting portion 42, the connecting portion 42 extends along the plane of the arc inlet, the plane of the connecting portion 42 and the plane of the arc extinguishing grating plate 2 are arranged at an included angle, part of the area of the arc inlet is covered by the connecting portion 42, namely, the arc inlet corresponding to the upper side of the moving contact A in the figure is covered by the connecting portion 42, so that part of the arc inlet corresponds to the contact mechanism, and an arc generated by the contact enters the arc extinguishing cavity through an inlet with smaller size, and is then discharged from an exhaust port with larger size, as shown in fig. 1, 2, 5-8 and 10, in the embodiment, the plane of the connecting portion 42 is perpendicular to the plane of the arc extinguishing plate 2, the first assembly groove 13 for plugging the first striking plate 4 comprises a first assembling groove 13 communicated with the first striking plate and a second striking plate, the first striking plate is limited by the first bending section and the first arc inlet is arranged in the first arc inlet is limited by the first arc striking plate 4 and is limited by the first arc striking plate 4 is limited by the first arc inlet is limited by the first arc striking plate 4 and is limited by the first arc striking plate and limited by the first arc striking plate 4 is limited by the first arc striking plate 4.

As shown in fig. 1, 5 and 7-9, a pair of gas generating members 3 are further disposed at two sides of the arc inlet, the second end of each arc extinguishing grating sheet 2 is provided with an arc extinguishing groove, the gas generating members 3 can wrap the side wall ends of two sides of the arc extinguishing groove, preferably, the arc extinguishing wall 1 is provided with a second assembling groove 14 for assembling the gas generating members 3, the second assembling groove 14 is located at one end of all positioning grooves 11 far away from the supporting wall (that is, the second assembling groove 14 is located at the arc extinguishing wall 1 adjacent to the arc inlet), one end of the first assembling groove 13 is communicated with the second assembling groove 14, that is, one end of the first limiting section far away from the second limiting section is communicated, and the gas generating members 3 are assembled in the second assembling groove 14 in a fitting manner, so that the body of the gas generating members 3 can be kept flat with the side wall of the arc extinguishing chamber.

In this embodiment, each gas generating member 3 is inserted into the first arc striking plate 4 and the second arc extinguishing grid plate 22 to be assembled in the arc extinguishing cavity, and the pair of gas generating members 3 are symmetrically distributed on two sides of the arc inlet.

Each gas generating part 3 is provided with a limiting boss 31, each limiting boss 31 is provided with a first slot 312 for being inserted into the first striking plate 4, specifically as shown in fig. 8, the gas generating part 3 comprises a body, the body is in a fan-shaped plate structure as a whole in fig. 9, one side surface of the body is convexly provided with the limiting boss 31, preferably the limiting boss 31 extends along the direction vertical to the body, the limiting boss 31 is also vertical to the plate surface of the arc extinguishing wall 1, the limiting boss 31 is an inclined table in fig. 9, the inclined surface of the limiting boss 31 is positioned at one side far away from the body, the inclined surface is used as a matching surface 311 to be provided with a first slot 312, the plane of the first slot 312 is vertical to the plate surface of the arc extinguishing wall 1, the maximum protruding height of the limiting boss 31 corresponds to the middle part of the body, as shown in fig. 4, 5 and 9, a pair of the gas generating parts 3 are assembled in the arc extinguishing cavity, a pair of limiting bosses 31 are oppositely arranged, wherein the mating surfaces 311 of the two limiting bosses 31 are oppositely disposed, the mating surfaces 311 face the first striking plate 4, so that the engaging portion 42 of the first striking plate 4 may be inserted into the first slot 312, the narrowest region between the two limiting bosses 31 corresponds to the middle of the entrance arc, the widest region between the two limiting bosses 31 corresponds to the entrance arc near one end of the first striking plate 4, the two opposite inclined surfaces gradually reduce the spacing between the pair of limiting bosses 31 to form a flare, the narrowest region of the flare corresponds to the middle of the entrance arc, that is, the narrowest spacing between the two limiting bosses 31 corresponds to the middle of the entrance arc, in this embodiment, the narrowest spacing between the two limiting bosses 31 (L4 in fig. 4 represents the narrowest spacing between the two limiting bosses 31) is equal to or greater than the opening spacing of the second arc extinguishing groove 221 (fig. 13, the opening interval of the second arc extinguishing groove 221 is denoted by L5), namely L4 is more than or equal to L5/3, namely the width L4 of the narrowest region of the bell mouth is more than or equal to one third of the opening interval L5 of the second arc extinguishing groove 221, and the width of the widest region of the bell mouth is less than or equal to four fifths of the width of the first arc striking plate 4; at least one second slot 32 is further arranged in the middle of the board surface of the body, the second slot 32 is located on one side of the limiting boss 31, the second slot 32 is used for being inserted into the extending portion 222 of the second arc-extinguishing grid piece 22, two second slots 32 which are arranged at intervals are arranged in fig. 9, and the distance between every two adjacent second slots 32 is equal to the distance between two second arc-extinguishing grid pieces 22.

As an embodiment of the second gas generating member 3 assembly, a pair of gas generating members 3 are inserted into the arc extinguishing gate 2, specifically, the gas generating members 3 are inserted into the extending portions 222 of the second arc extinguishing gate 22, in this embodiment, the gas generating members 3 adopt the same structure as the above embodiment, but the first slots 312 are not provided on the limiting boss 31, but the connecting portions 42 of the first arc striking pieces 4 still need to cover part of the arc inlets, the first arc striking pieces 4 and the pair of limiting bosses 31 cooperate to form a bell mouth, and the extending portions 222 of the second arc extinguishing gate 22 are inserted into the second slots 32, so that the gas generating members 3 are assembled in the arc extinguishing cavity, but when the friction force between the extending portions 222 and the second slots 32 is insufficient or the second slots 32 deform, the assembly stability of the gas generating members 3 is affected.

As an embodiment of the third gas generating member 3 assembly, a pair of gas generating members 3 are inserted into the first arc striking plate 4, and specifically, the gas generating members 3 are inserted into the engagement portions 42 of the first arc striking plate 4, in this embodiment, the gas generating members 3 may adopt the structure of the first assembly embodiment, the second slots 32 may be omitted from being provided on the body of the gas generating member 3, or the arc extinguishing grid plates 2 may include only the first arc extinguishing grid plates 21 provided at a plurality of intervals.

In addition, the gas generating member 3 may be inserted into the first arc extinguishing grid 21, but the body of the gas generating member 3 and the second fitting groove 14 are larger in size.

As shown in fig. 1, the arc extinguishing chamber further comprises two flame extinguishing plates 7, a metal mesh plate 81 and a cover plate 9, wherein the two flame extinguishing plates 7 and the metal mesh plate 81 are sequentially overlapped and covered on the exhaust port, in this embodiment, at least two shaft rods 82 are arranged between the two adjacent flame extinguishing plates 7, the space between the two adjacent flame extinguishing plates 7 is increased by the shaft rods 82, correspondingly, at least two shaft rods 82 are also arranged between the metal mesh plate 81 and the adjacent flame extinguishing plates 7, and the shaft rods 82 between the metal mesh plate 81 and the flame extinguishing plates 7 are preferably perpendicular to the shaft rods 82 between the two flame extinguishing plates 7, the cover plate 9 is provided with through holes corresponding to the exhaust port, and the cover plate 9 is covered on the metal mesh plate 81 and fixedly connected with the arc extinguishing wall 1, so that the metal mesh plate 81, the flame extinguishing plates 7 and the shaft rods 82 are fixed between the cover plate 9 and the exhaust port.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims

1. The explosion chamber, including explosion chamber and first striking piece (4), be equipped with a plurality of interval relative arc extinguishing bars piece (2), its characterized in that between the income arc mouth and the gas vent of explosion chamber: the first arc striking piece (4) extends to the arc extinguishing chamber from the arc inlet of the arc extinguishing chamber and is limited in the arc extinguishing chamber, the first arc striking piece (4) is opposite to the plate surface of the arc extinguishing grating piece (2) at intervals, a pair of gas generating pieces (3) distributed on two sides of the arc inlet are further arranged in the arc extinguishing chamber, and each gas generating piece (3) is fixedly connected with the first arc striking piece (4) and/or the arc extinguishing grating piece (2) in an inserting mode in the arc extinguishing chamber.

2. The arc chute of claim 1 wherein: the arc extinguishing grid piece (2) comprises a second arc extinguishing grid piece (22), a second arc extinguishing groove (221) is formed in one end of the second arc extinguishing grid piece (22), two sides of the second arc extinguishing groove (221) extend to form an extension portion (222), and the extension portion (222) and the first arc striking piece (4) are connected with the gas production piece (3) in an inserting mode.

3. The arc chute of claim 1 wherein: the first end of the first arc striking piece (4) extends into the arc striking cavity and is opposite to the arc extinguishing grid piece (2) at intervals, the second end of the first arc striking piece (4) is bent and extended to form a connecting portion (42) which is spliced with the gas generating piece (3), the connecting portion (42) extends along the plane where the arc entrance is located and seals a part of the area where the arc entrance is located, and the plane where the connecting portion (42) is located is arranged at an included angle with the plane where the arc extinguishing grid piece (2) is located.

4. An arc chute as claimed in claim 3, wherein: one end protrusion that every gas production spare (3) are close to first striking piece (4) is equipped with spacing boss (31), and the mating surface (311) of two spacing bosses (31) set up relatively and offered a first slot (312) respectively, and the plane that first slot (312) is located is perpendicular with the lateral wall of arc extinguishing chamber, and linking portion (42) are pegged graft in first slot (312), are equipped with at least one second slot (32) that are used for pegging graft with arc extinguishing bars piece (2) at gas production spare (3) of spacing boss (31) one side.

5. The arc chute of claim 4 wherein: the pair of spacing boss (31) are the sloping platform, and a pair of mating surface (311) are the inclined plane and make the interval between a pair of spacing boss (31) reduce gradually and form the horn mouth, the narrowest region of horn mouth corresponds to the middle part of going into the arc mouth, and the widest region of horn mouth corresponds to the one end that the arc mouth is close to first striking piece (4) that goes into.

6. The arc chute of claim 5 wherein: the width of the narrowest area of the horn mouth is more than or equal to one third of the opening interval of the second arc extinguishing groove (221), and the width of the widest area of the horn mouth is less than or equal to four fifths of the width of the first arc striking piece (4).

7. The arc chute of claim 1 wherein: a pair of lateral wall avris of arc extinguishing chamber has seted up first assembly groove (13) and second assembly groove (14) respectively, and the both sides side limit of connection between the first end of first striking piece (4) and second end is pegged graft respectively and is limited in a pair of first assembly groove (13), and second assembly groove (14) are located the both sides of income arc mouth respectively, and every gas production spare (3) laminating sets up in a second assembly groove (14), makes the body of gas production spare (3) and the lateral wall of arc extinguishing chamber remain level.

8. The arc chute of claim 2 wherein: at least one second slot (32) is arranged in the middle of each gas generating piece (3), and the second slots (32) are in plug-in fit with the edges of the extending parts (222).

9. The arc chute of claim 1 wherein: still include second striking piece (5), at least one flame extinguishing piece (7), metal otter board (81) and apron (9), second striking piece (5) extend to the arc extinguishing intracavity from the income arc mouth, and a plurality of arc extinguishing bars piece (2) are located between first striking piece (4) and second striking piece (5), flame extinguishing piece (7), metal otter board (81) and apron (9) range upon range of in proper order and cover in the gas vent.

10. The arc chute of claim 1 wherein: the utility model provides an explosion chamber is formed by a pair of parallel relative arc extinguishing wall (1), and the one end butt joint of a pair of arc extinguishing wall (1) forms the diapire of explosion chamber the gas vent has been seted up at the diapire middle part of explosion chamber, and the one end of the explosion chamber relative with the gas vent is the income arc mouth, has seted up a plurality of constant head tanks (11) of interval arrangement at arc extinguishing wall (1), and a plurality of arc extinguishing bars piece (2) correspond the assembly with a plurality of constant head tanks (11) respectively, arc extinguishing wall (1) still has seted up first assembly groove (13) and second assembly groove (14) that are used for assembling first arc striking piece (4) and gas production piece (3) respectively, second assembly groove (14) are located arc extinguishing wall (1) region that is close to into the arc mouth, and first assembly groove (13) are including the first spacing section and the second spacing section of intercommunication, the limit section sets up along the limit side of wall (1) and is opposite with a plurality of constant head tanks (11) interval, and second spacing section is buckled with second assembly groove (14) to the middle part that is close to the arc extinguishing mouth.