CN219917052U

CN219917052U - Arc extinguishing chamber

Info

Publication number: CN219917052U
Application number: CN202320331164.7U
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: 2023-10-27
Anticipated expiration: 2033-02-10

Abstract

The explosion chamber, including the explosion chamber a plurality of interval arrangement's constant head tank has been seted up to the lateral wall in explosion chamber, and a plurality of arc extinguishing bars piece that are located between the inlet and the gas vent of explosion chamber correspond the assembly with a plurality of constant head tanks respectively, the first spacing groove of all constant head tanks of intercommunication is seted up to the lateral wall in explosion chamber, and the breach has been seted up at the lateral wall edge of connecting between the first end and the second end of every arc extinguishing bars piece, and the breach of a plurality of arc extinguishing bars piece communicates in proper order and forms the second spacing groove, second spacing groove and first spacing groove butt joint form the spacing groove the locating part has been inserted in the spacing groove. The arc-extinguishing grid plates are correspondingly assembled in the positioning grooves, the first limiting grooves and the second limiting grooves are in butt joint to form the limiting grooves and are inserted with the limiting pieces, the limiting pieces can limit all the arc-extinguishing grid plates to move along the central axes of the positioning grooves, the consistency of the assembling positions of the arc-extinguishing grid plates is ensured, and the normal use of the arc-extinguishing chamber is not affected due to poor matching of part of the arc-extinguishing grid plates and the positioning grooves.

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, in the existing explosion chamber, a plurality of positioning grooves are formed in the side wall of the explosion chamber, arc extinguishing grid sheets are assembled in the positioning grooves in a one-to-one correspondence mode, and due to the fact that the positioning grooves are independent of each other, assembly is complicated, assembly consistency of the arc extinguishing grid sheets is not guaranteed, if the arc extinguishing grid sheets are not matched with the positioning grooves well, the arc extinguishing grid sheets move along the axis of the positioning grooves, and normal use of the explosion chamber is not facilitated.

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 explosion chamber, including the explosion chamber a plurality of interval arrangement's constant head tank has been seted up to the lateral wall in explosion chamber, and a plurality of arc extinguishing bars piece that are located between the inlet and the gas vent of explosion chamber correspond the assembly with a plurality of constant head tanks respectively, the first spacing groove of all constant head tanks of intercommunication is seted up to the lateral wall in explosion chamber, and the breach has been seted up at the lateral wall edge of connecting between the first end and the second end of every arc extinguishing bars piece, and the breach of a plurality of arc extinguishing bars piece communicates in proper order and forms the second spacing groove, second spacing groove and first spacing groove butt joint form the spacing groove the locating part has been inserted in the spacing groove.

Preferably, at least one end of the limiting groove extends to the outer surface of the arc extinguishing cavity to form a socket, and the limiting piece is inserted into the limiting groove from the socket.

Preferably, the first end of the arc-extinguishing grating sheet corresponds to the exhaust port, the second end of the arc-extinguishing grating sheet corresponds to the arc inlet, and arc-extinguishing grooves are formed in the end parts of the second ends of the arc-extinguishing grating sheets, clamping grooves are formed in the edges of the two sides of the second ends of the arc-extinguishing grating sheets, the arc-extinguishing grooves are located between the two clamping grooves, the clamping grooves enable the side walls of the arc-extinguishing grating sheets to form clamping-in positioning groove step surfaces, and the side wall edges connected between the clamping grooves and the first ends of the arc-extinguishing grating sheets are provided with notches.

Preferably, the central axis of the first limiting groove is perpendicularly intersected with the central axis of the positioning groove.

Preferably, the arc extinguishing device further comprises a first arc striking piece, a second arc striking piece and a pair of gas generating pieces, wherein the arc extinguishing grid pieces and the pair of gas generating pieces are positioned between the first arc striking piece and the second arc striking piece, the first arc striking piece is in limit fit with the side wall of the arc extinguishing cavity, and the pair of gas generating pieces are distributed on two sides of the arc inlet and are respectively spliced with the first arc striking piece.

Preferably, the arc-extinguishing grid plates comprise a plurality of first arc-extinguishing grid plates and at least one second arc-extinguishing grid plate, and the length of the second arc-extinguishing grid plate is greater than that of the first arc-extinguishing grid plate and the second arc-extinguishing grid plate is in plug-in limit with the gas production piece.

Preferably, the first end of the first arc-extinguishing grating sheet is kept flush with the first end of the second arc-extinguishing grating sheet, the second end of the second arc-extinguishing grating sheet is provided with the first arc-extinguishing groove, the second end of the second arc-extinguishing grating sheet is provided with the second arc-extinguishing groove, the groove bottom of the first arc-extinguishing groove is far away from the arc inlet than the groove bottom of the second arc-extinguishing groove, the opening interval of the second arc-extinguishing groove is larger than the opening interval of the first arc-extinguishing groove, and the side walls on two sides of the second arc-extinguishing groove extend towards the arc inlet and are spliced with the gas generating piece.

Preferably, the first arc-extinguishing grating sheet is provided with an eccentric first arc-extinguishing groove, at least one first arc-extinguishing groove is different from the eccentric direction of other first arc-extinguishing grooves, the first arc-extinguishing groove comprises a first open groove, the opening of the first open groove is positioned at the second end edge of the first arc-extinguishing grating sheet, the side wall end parts of the two sides of the first open groove are in sharp angle shapes, the middle part of the groove bottom of the first open groove is provided with a V-shaped second open groove, the groove bottom of the second open 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.

Preferably, the arc extinguishing chamber is formed by a pair of parallel opposite arc extinguishing walls, one ends of the arc extinguishing walls are in butt joint to form the bottom wall of the arc extinguishing chamber, the middle part of the bottom wall of the arc extinguishing chamber is provided with an exhaust port, one end of the arc extinguishing chamber opposite to the exhaust port is an arc inlet, and a plurality of positioning grooves arranged at intervals are formed in the arc extinguishing walls.

Preferably, the device further comprises at least one flame extinguishing piece, a metal mesh plate and a cover plate, wherein the flame extinguishing piece, the metal mesh plate and the cover plate are sequentially overlapped and covered on the exhaust port.

According to the arc-extinguishing chamber, the arc-extinguishing grid sheets are correspondingly assembled in the positioning grooves, the first limiting grooves are communicated with all the positioning grooves, the notches of the arc-extinguishing grid sheets are communicated to form the second limiting grooves, the first limiting grooves are in butt joint with the second limiting grooves to form the limiting grooves, and the limiting pieces are inserted into the limiting grooves, so that the limiting pieces can limit all the arc-extinguishing grid sheets to move along the central axis of the positioning grooves, the consistency of the assembling positions of the arc-extinguishing grid sheets is ensured, and the normal use of the arc-extinguishing chamber is not influenced due to poor matching of part of the arc-extinguishing grid sheets and the positioning grooves.

In addition, the locating part can be from the outer plug-in connection of arc extinguishing chamber, has the convenient advantage of assembly.

In addition, the gas producing piece is further arranged in the arc extinguishing cavity, and the longer second arc extinguishing grating piece in the arc extinguishing grating pieces can be fixedly connected with the gas producing piece in an inserting mode, so that the assembling stability of the gas producing piece is guaranteed.

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 is a schematic structural view of a second arc chute sheet according to the present utility model;

fig. 13 is a schematic structural diagram 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 a plurality of positioning grooves 11 are arranged on the side wall of the arc extinguishing cavity at intervals, a plurality of arc extinguishing grid plates 2 are correspondingly assembled with the positioning grooves 11, a first limiting groove 12 communicated with all the positioning grooves 11 is also arranged on the side wall of the arc extinguishing cavity, a notch 201 is arranged on the side wall edge connected between the first end and the second end of each arc extinguishing grid plate 2, the notches 201 of the plurality of arc extinguishing grid plates 2 are sequentially communicated to form a second limiting groove, the second limiting groove is butted with the first limiting groove 12 to form a limiting groove, and a limiting piece 6 is inserted into the limiting groove. So the structure, the locating part 6 can restrict all arc extinguishing bars 2 to move along the central axis of the locating slot 11, ensures the assembly consistency of the arc extinguishing bars 2, and can not produce partial arc extinguishing bars 2 to be in bad fit with the locating slot 11 so as to influence the normal use of the arc extinguishing chamber.

Further, at least one end of the limiting groove extends to the outside of the arc extinguishing cavity to form a socket, the limiting piece 6 is inserted into the limiting groove from the socket, and the assembly mode of inserting the limiting piece 6 from the outside of the arc extinguishing cavity is adopted, so that the operation is simplified, and the assembly is convenient.

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 plane 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 other ends opposite to the exhaust port are 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.

Specifically, 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 cavity, the second end of the arc-extinguishing grating sheet 2 corresponds to the arc inlet, the second end of the arc-extinguishing grating sheet 2 is provided with arc-extinguishing grooves, two side edges of the second end of the arc-extinguishing grating sheet 2 are provided with clamping grooves 202, the arc-extinguishing grooves are located between the two clamping grooves 202, the clamping grooves 202 form a step surface clamped with the positioning grooves 11 on the side of the arc-extinguishing grating sheet 2, 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 an eccentric first arc-extinguishing groove 211, and 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 grating sheets 22, and the second arc-extinguishing grooves 222 extend from the second ends 22 into the arc inlet 222 of each second grating sheet 22. In addition, the first arc-extinguishing gate sheet 21 may be disposed between two adjacent second arc-extinguishing gate sheets 22, the length of the second arc-extinguishing gate sheet 22 is longer than that of the first arc-extinguishing gate sheet 21, 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 sheet 21 may not be disposed between two adjacent second arc-extinguishing gate sheets 22.

As shown in fig. 1, 2 and 6-8, a first limiting groove 12 communicating all the positioning grooves 11 is further formed in the middle of each arc extinguishing wall 1, wherein the central axis of the first limiting groove 12 intersects with the central axis of the positioning groove 11, in this embodiment, the first limiting groove 12 is a strip-shaped groove as a whole, the central axis of the first limiting groove 12 intersects with the central axis of the positioning groove 11 vertically, as shown in fig. 5-7 and 11-13, a notch 201 is formed at the edge of the side wall connected to the first end and the second end of each arc extinguishing grid 2, in this embodiment, the notch 201 is located at the edge of the side wall connected between the clamping groove 202 and the first end of the arc extinguishing grid 2, that is, a notch 201 is formed at the edge of the step surface of the arc extinguishing grid 2 for clamping into the clamping groove 202, the breach 201 of a plurality of arc extinguishing bars piece 2 communicates in proper order and forms the second spacing groove, dock with first spacing groove 12 by the second spacing groove and form the spacing groove, the both ends of first spacing groove 12 are opened and the open edge that is located arc extinguishing wall 1 of first spacing groove 12, from this make the both ends of spacing groove open and form the socket that can communicate the arc extinguishing intracavity portion, peg graft the locating part 6 in the spacing inslot and can follow socket assembly, in this embodiment, spacing groove and locating part 6 are the preferential linear structure, the cooperation of conveniently pegging graft, so, after arc extinguishing bars piece 2 and locating groove 11 peg graft and accomplish, peg graft the locating part 6 at last, both can restrict all arc extinguishing bars piece 2 and remove along the central axis of locating groove 11, also possess the advantage of simple and convenient assembly. Compared with the complex operation of fixing a plurality of arc extinguishing bars 2 and the first limit groove 12 of the other arc extinguishing wall 1 when the other arc extinguishing wall 1 is assembled after the arc extinguishing bars 2 are arranged in the first limit groove 12 of the one arc extinguishing wall 1, the limit mode of the embodiment ensures that the assembly is faster and more convenient.

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 ends of the first arc-extinguishing grating sheet 21 and the second arc-extinguishing grating sheet 22 are kept flush, the second ends of the first arc-extinguishing grating sheet 21 are far away from the arc inlet compared with the second arc-extinguishing grating sheet 22, the second ends of the first arc-extinguishing grating sheet 21 are provided with first arc-extinguishing grooves 211, the first arc-extinguishing grooves comprise first open grooves, the openings of the first open grooves are located at the edges of the second ends of the first arc-extinguishing grating sheet 21, the side wall end parts of the two sides of the first open grooves are in a sharp angle shape, the middle part of the groove bottom of the first open grooves is provided with second open grooves in a V shape, and the groove bottom of the second open grooves is provided with eccentric grooves, and the central axes of the eccentric grooves deviate from the central axes 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 a direction close to the arc inlet to form extension parts 222, each extension part 222 can be wrapped in the gas generating part 3, in this embodiment, the extension parts 222 can be inserted into the gas generating part 3, the second arc-extinguishing grating piece 22 with longer length is further fixed, the structure of the second arc-extinguishing grating piece is more stable, the first arc-extinguishing grating piece 21 and the second arc-extinguishing grating piece 22 are assembled in the arc-extinguishing cavity, the groove bottom of the first arc-extinguishing groove 211 is far away from the arc inlet than the groove bottom of the second arc-extinguishing groove 221, that is, in fig. 5 and 6, the groove bottom height of the first arc-extinguishing groove 221 is higher than the groove bottom height of the second arc-extinguishing groove 222, in this embodiment, the side wall ends at two sides of the first opening groove 221 are located above the gas generating part 3, and the first arc-extinguishing grating piece 21 is not inserted into the gas generating part 3, but the two side walls of the first opening groove are also prolonged to enable the first arc-extinguishing grating piece 21 to be inserted into the gas generating part 3.

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, 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, so as to ensure that the first striking plate 4 is stably connected with the side wall of the arc extinguishing cavity; 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 cover the side wall ends at 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 in the area of the arc extinguishing wall 1 near the arc inlet), one end of the first assembling groove 13 is communicated with the second assembling groove 14, 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 cavity.

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 of a fan-shaped plate structure in fig. 8, 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. 8, the inclined surface of the limiting boss 31 is positioned at one side far away from the body, the inclined surface is a matching surface 311 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 8, 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 surface 311 faces 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, preferably, the pitch between the pair of limiting bosses 31 is gradually reduced to form a flared mouth, and the narrowest region of the flared mouth corresponds to the middle of the entrance arc, the narrowest pitch between the two limiting bosses 31 corresponds to the middle of the entrance arc, the widest region of the flared mouth corresponds to the end of the entrance arc near the first striking plate 4, that is, the widest pitch between the two limiting bosses 31 is located at the end of the entrance arc near the first striking plate 4, in this embodiment, the narrowest pitch between the two limiting bosses 31 (the narrowest pitch between the two limiting bosses 31 is denoted by L4 in fig. 4) is greater than or equal to one third of the opening pitch of the second arc extinguishing groove 221 (the opening pitch of the second arc extinguishing groove 221 is denoted by L5 in fig. 13), that is, L4 is not less than L5/3, and the widest distance between the pair of limiting bosses 31 is smaller than the width of the first 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 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.

As another embodiment of the arc extinguishing chamber, the limit groove in this embodiment is completely located in the arc extinguishing chamber, that is, a socket extending out of the arc extinguishing chamber is not provided, and the rest of the structure is the same as that of the above embodiment. Of course, in the present embodiment, the shapes of the stopper 6 and the stopper groove are not limited to the straight line shape, and may be other irregular shapes.

The assembly process of this embodiment is that firstly, the first limiting groove 12 of one arc-extinguishing wall 1 is assembled with the limiting piece 6, then the arc-extinguishing grid pieces 2 are assembled in the positioning groove 11 in a one-to-one correspondence manner, at this time, the notches 201 on one side of the arc-extinguishing grid pieces 2 are in one-to-one correspondence with the limiting piece 6 and are in butt joint with the first positioning groove 11 to form a limiting groove, the notches 201 on the other side of the arc-extinguishing grid pieces 2 are communicated to form a second limiting groove, and the second limiting groove is assembled with the other limiting piece 6, so that the first limiting groove 12 of the other arc-extinguishing wall 1 is in butt joint with the second limiting groove to form a limiting groove, at this time, the other limiting piece 6 is positioned in the other limiting groove of the arc-extinguishing chamber, finally, the arc-extinguishing grid pieces 2 are ensured to be in one-to-one correspondence with the positioning groove 11 of the other arc-extinguishing wall 1, and finally the flame-extinguishing piece 7, the metal screen 81 and the cover plate 9 are assembled.

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 the explosion chamber a plurality of interval arrangement's constant head tank (11) have been seted up to the lateral wall in explosion chamber, a plurality of arc extinguishing bars piece (2) that are located between the income arc mouth of explosion chamber and the gas vent correspond the assembly with a plurality of constant head tanks (11) respectively, its characterized in that: the side wall of arc extinguishing chamber has seted up first spacing groove (12) of all constant head tanks (11) of intercommunication, and breach (201) have been seted up at the lateral wall edge of connecting between the first end and the second end of every arc extinguishing bars piece (2), and breach (201) of a plurality of arc extinguishing bars pieces (2) communicate in proper order and form the second spacing groove, second spacing groove and first spacing groove (12) butt joint form the spacing groove limiting part (6) have been inserted in the spacing groove.

2. The arc chute of claim 1 wherein: at least one end of the limiting groove extends to the arc extinguishing cavity to form a socket, and the limiting piece (6) is inserted into the limiting groove from the socket.

3. The arc chute of claim 1 wherein: the first end of arc extinguishing bars piece (2) corresponds the gas vent, and the second end of arc extinguishing bars piece (2) corresponds into the arc mouth to the draw-in groove (202) have been seted up at the second end tip of every arc extinguishing bars piece (2) second end both sides edge, and the draw-in groove is located between two draw-in grooves (202), draw-in groove (202) make the lateral wall formation card of arc extinguishing bars piece (2) go into positioning groove (11) step face, connect lateral wall edge between draw-in groove (202) and the first end of arc extinguishing bars piece (2) and set up breach (201).

4. The arc chute of claim 1 wherein: the central axis of the first limit groove (12) is perpendicularly intersected with the central axis of the positioning groove (11).

5. The arc chute as in any one of claims 1-4 wherein: still include first striking piece (4), second striking piece (5) and a pair of gas production piece (3), a plurality of arc extinguishing bars piece (2) and a pair of gas production piece (3) all are located between first striking piece (4) and second striking piece (5), the spacing cooperation of lateral wall in first striking piece (4) and arc extinguishing chamber, a pair of gas production piece (3) distribute in the both sides of income arc mouth and peg graft with first striking piece (4) respectively.

6. The arc chute of claim 5 wherein: the arc-extinguishing grid plates (2) comprise a plurality of first arc-extinguishing grid plates (21) and at least one second arc-extinguishing grid plate (22), and the length of the second arc-extinguishing grid plate (22) is larger than that of the first arc-extinguishing grid plates (21) and the second arc-extinguishing grid plates (22) are in plug-in limit with the gas production piece (3).

7. The arc chute of claim 6 wherein: the first end of first arc extinguishing bars piece (21) keeps the parallel and level with the first end of second arc extinguishing bars piece (22), and first arc extinguishing groove (211) have been seted up to the second end tip of first arc extinguishing bars piece (21), and second arc extinguishing groove (221) have been seted up to the second end of second arc extinguishing bars piece (22), the tank bottom of first arc extinguishing groove (211) is more far away from into the arc mouth than the tank bottom of second arc extinguishing groove (221), the opening interval of second arc extinguishing groove (221) is greater than the opening interval of first arc extinguishing groove (211), extends to into the arc mouth direction by the both sides lateral wall of second arc extinguishing groove (221) and pegging graft with gas production spare (3).

8. The arc chute of claim 7 wherein: the first arc extinguishing bars piece (21) is equipped with eccentric first arc extinguishing groove (211), and has at least the eccentric direction of first arc extinguishing groove (211) different, and first arc extinguishing groove (211) are including first open slot, the opening in first open slot is located the second end edge of first arc extinguishing bars piece (21), and the lateral wall tip in first open slot both sides is sharp angle shape, has seted up the second open slot of V-arrangement at the tank bottom middle part in first open slot, has seted up eccentric groove at the tank bottom in second open slot, the central axis of eccentric groove skew the central axis of first arc extinguishing bars piece (21).

9. The arc chute of claim 1 wherein: the arc extinguishing chamber is formed by a pair of parallel opposite arc extinguishing walls (1), one ends of the arc extinguishing walls (1) are in butt joint to form the bottom wall of the arc extinguishing chamber, the middle part of the bottom wall of the arc extinguishing chamber is provided with an exhaust port, one end of the arc extinguishing chamber opposite to the exhaust port is an arc inlet, and a plurality of positioning grooves (11) which are arranged at intervals are formed in the arc extinguishing walls (1).

10. The arc chute of claim 1 wherein: the flame extinguishing device further comprises at least one flame extinguishing piece (7), a metal mesh plate (81) and a cover plate (9), wherein the flame extinguishing piece (7), the metal mesh plate (81) and the cover plate (9) are sequentially overlapped and covered on the exhaust port.