CN218769370U - Arc extinguishing mechanism - Google Patents

Abstract

The utility model provides an arc extinguishing mechanism, includes the explosion chamber, the explosion chamber includes two baffles and sets up a plurality of arc extinguishing bars piece between two baffles, is equipped with at arc extinguishing bars piece top with moving contact or static contact complex arc striking, arc extinguishing mechanism still includes first magnetism mechanism that increases, first magnetism mechanism that increases includes two first magnetism pieces that set up in a plurality of arc extinguishing bars piece both sides relatively, and sets up the striking structure of arc extinguishing bars piece bottom, first magnetism piece that increases is parallel the baffle, first magnetism piece, striking structure with the arc striking piece forms first magnetic circuit, first magnetic circuit is used for producing the power that promotes to the gas vent direction of explosion chamber to the electric arc that gets into the explosion chamber, through first magnetism piece with the arc striking piece to and the arc extinguishing bars piece bottom forms first magnetic circuit, can accelerate the speed that electric arc removed, further improves the speed of extinguishing electric arc.

Description

Arc extinguishing mechanism

Technical Field

The utility model relates to a low-voltage apparatus field, concretely relates to arc extinguishing mechanism.

Background

The breaker is mainly used for bearing normal working current, and in addition, the breaker can break fault current appearing in a circuit, electric arc can be generated in the breaking process of fault large current, and current-carrying equipment can be directly damaged in serious conditions because the electric arc can generate adverse effect on a current-carrying circuit and the breaker. Therefore, how to transfer and eliminate the arc quickly is very important, and especially for direct current type circuit breaker products, how to transfer and eliminate the arc becomes a key point and a difficulty in design.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a circuit breaker that arc extinguishing ability is strong, convenient assembling.

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

the utility model provides an arc extinguishing mechanism, includes the explosion chamber, the explosion chamber includes two baffles and sets up a plurality of arc extinguishing bars piece between two baffles, be equipped with at arc extinguishing bars piece top with moving contact or static contact complex striking piece, arc extinguishing mechanism still includes first magnetism mechanism that increases, first magnetism mechanism that increases is in including relative two first magnetism pieces that set up in a plurality of arc extinguishing bars piece both sides, and sets up the striking structure of arc extinguishing bars piece bottom, first magnetism piece that increases is parallel the baffle, first magnetism piece, striking structure with the striking piece forms first magnetic circuit, first magnetic circuit is used for producing the power that promotes to the gas vent direction of explosion chamber to the electric arc that gets into the explosion chamber.

Preferably, the magnetic force increasing device comprises two arc-extinguishing chambers, and the two arc-extinguishing chambers are provided with the first magnetic force increasing mechanisms.

Preferably, the arc extinguishing grid pieces at the bottoms of the two arc extinguishing chambers are conducted to form the arc striking structure or the arc extinguishing grid pieces at the bottoms of the two arc extinguishing chambers are integrally formed to form the arc striking structure.

Preferably, the arc extinguishing mechanism further comprises a second magnetism increasing mechanism, the second magnetism increasing mechanism comprises two second magnetism increasing sheets which are arranged oppositely, and the two second magnetism increasing sheets are arranged on two sides of a motion track of the moving contact at the opening position and the closing position.

Preferably, the second magnetism increasing sheet and the arc striking sheet form a second magnetic loop, and the second magnetic loop is used for forming a force for pushing the arc generated during breaking to the direction of the air inlet of the arc extinguishing chamber.

Preferably, the arc extinguish chamber is arranged on the inner side of the shell, and the first magnetism increasing sheet is arranged on the outer side of the shell.

Preferably, the magnetic conduction device further comprises a magnetic conduction block, wherein the magnetic conduction block is arranged on the side face, far away from the moving contact, of the fixed contact and is located between the two second magnetism increasing sheets.

Preferably, the static contact includes the contact plate, and the contact plate is including the connecting portion that are equipped with the stationary contact, the side that the moving contact was kept away from at connecting portion is installed to the magnetic conduction piece.

Preferably, the device comprises two arc striking pieces, wherein the two arc striking pieces are respectively a first arc striking piece and a second arc striking piece, and the first arc striking piece and the second arc striking piece are respectively matched with the fixed contact and the movable contact; the arc striking piece comprises a contact part and an arc striking part which are connected in a bending way, the contact part of the first arc striking piece is connected with the fixed contact, and the arc striking part of the first arc striking piece extends to the upper part of one arc extinguishing chamber; and the arc angle of the moving contact is in contact fit with the contact part of the second arc striking piece when in a fully opened position, and the arc striking part of the second arc striking piece extends to the position above the other arc extinguishing chamber.

Preferably, the arc striking piece is provided with an arc striking groove.

Preferably, the outer sides of the two opposite side walls of the shell are respectively provided with a first groove and a second groove, and the first magnetism increasing sheet and the second magnetism increasing sheet are respectively arranged in the first groove and the second groove and are covered by insulating plates.

Preferably, the one end that two explosion chambers are close to each other is the air inlet, and the one end of keeping away from each other is the gas vent, and two sets of explosion chambers are symmetrical arrangement in casing bottom both ends, the both ends lateral wall of casing is equipped with two gas outlets that the symmetry set up, and two gas outlets correspond with the gas vent of two sets of explosion chambers respectively.

Preferably, guide surfaces are provided at upper and lower ends of the air outlets at both sides, respectively, and the guide surfaces are formed in an inclined or curved shape.

Preferably, at least part of the arc-extinguishing grid plates of each group of arc-extinguishing chambers are respectively provided with an arc-striking groove at the end part close to the other group of arc-extinguishing chambers, the arc-extinguishing grid plates are provided with diffusion grooves communicated with the bottoms of the arc-striking grooves, and the maximum inner diameter of each diffusion groove is larger than the inner diameter of the bottom of the diffusion groove.

Preferably, the two groups of arc extinguish chambers are symmetrically arranged at two ends of the bottom of the shell; the tripper is arranged on the top side of one group of arc extinguish chambers, the static contact is arranged on the top side of the other group of arc extinguish chambers, and the moving contact is positioned between the tripper and the static contact.

Preferably, a fourth airtight space for accommodating the arc extinguish chamber and a first airtight space for accommodating the moving contact are arranged in the housing, a rotating shaft connected with the moving contact is arranged in the first airtight space, the moving contact is located in the first airtight space, one end, provided with the moving contact, of the moving contact extends into the fourth airtight space, and the first airtight space and the fourth airtight space are isolated from each other by an oscillating baffle which is arranged on the moving contact and is in an arc-shape and an insulating chute which is arranged on the housing and is matched with the oscillating baffle in the moving process of the moving contact.

Preferably, a second enclosed space for accommodating the static contact is arranged in the housing, the static contact is arranged in the second enclosed space, and only the static contact is exposed in the fourth enclosed space.

Preferably, a third airtight space for accommodating the release is arranged in the shell, the release is connected with the first lug, the moving contact is connected with the second lug, the first lug is connected with the second lug, the first airtight space and the third airtight space are separated by a first baffle and a second baffle which are arranged in a staggered mode, and a wiring groove for accommodating the first lug and the second lug is formed between the first baffle and the second baffle.

Preferably, the arc extinguishing grids of the two groups of arc extinguishing chambers are arranged on two oppositely arranged partition plates.

The utility model discloses an arc extinguishing mechanism, on the basis of current run-on piece guide electric arc, utilize the run-on piece to form the magnetic circuit that is used for driving electric arc to move, through first magnetism increase piece with the run-on piece to and the arc extinguishing bars piece of arc extinguishing bars piece bottom forms first magnetic circuit, first magnetic circuit is used for producing the power that promotes to the gas vent direction of explosion chamber to the electric arc that gets into the explosion chamber, can accelerate electric arc moving's speed, further improves the speed of extinguishing electric arc.

In addition, a second magnetic loop is formed by the second magnetizing sheet and the arc striking sheet, and the second magnetic loop is used for forming a force pushing the direction of an air inlet of the arc extinguishing chamber to the electric arc generated when the moving contact and the static contact are disconnected, so that the speed of extinguishing the electric arc can be further improved.

Drawings

FIG. 1 is a schematic diagram of an arc extinguishing mechanism;

FIG. 2 is a schematic structural view of the housing;

fig. 3 is a schematic structural diagram of the movable contact;

fig. 4 is a schematic structural view of an arc chute;

FIG. 5 is a schematic structural view of a first arc runner;

FIG. 6 is a schematic structural view of a second arc striking plate;

FIG. 7 is a schematic view of the arc chute;

fig. 8 is another schematic structural view of the arc chute plates;

FIG. 9 is a schematic view of the structure of the insulating plate;

figure 10 is a schematic view of the magnetic field within the circuit breaker;

fig. 11 is a schematic diagram of a first magnetic circuit and a second magnetic circuit.

Detailed Description

The following embodiments are provided in connection with the accompanying drawings to further illustrate the specific embodiments of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-2, the utility model discloses an arc extinguishing mechanism, including explosion chamber 37, explosion chamber 37 includes two baffles 41 and sets up a plurality of arc chute pieces 28 between two baffles 41, is equipped with at arc chute pieces 28 top with moving contact 23 or static contact 26 complex striking piece, arc extinguishing mechanism still includes first magnetism mechanism that increases, first magnetism mechanism that increases includes two first magnetism pieces 34 of relative setting in a plurality of arc chute pieces 28 both sides, first magnetism piece 34 is parallel baffle 41, first magnetism piece 34 with the striking piece to and the arc chute piece 28 of explosion chamber 37 bottom forms first magnetic circuit, first magnetic circuit is used for producing the power that promotes to the gas vent direction of explosion chamber 37 to the electric arc that gets into explosion chamber 37.

The utility model discloses an arc extinguishing mechanism, on the basis of current run-on piece guide electric arc, utilize the run-on piece to form the magnetic circuit that is used for driving electric arc to remove, through first magnetism increase piece 34 with the run-on piece to and the arc extinguishing bars piece 28 of 28 bottoms of arc extinguishing bars piece form first magnetic circuit, first magnetic circuit is used for producing the power that promotes to the gas vent direction of explosion chamber to the electric arc that gets into the explosion chamber, can accelerate the speed that electric arc removed, further improves the speed of extinguishing electric arc.

As shown in fig. 1, the circuit breaker of this embodiment includes the utility model discloses an arc extinguishing mechanism, the arc extinguishing mechanism of this embodiment include two explosion chambers 37 and two arc striking pieces, two explosion chambers 37 all be equipped with first magnetism increasing mechanism. Specifically, an arc extinguish chamber 37, a release 22, a movable contact 23 and a fixed contact 26 are arranged in a shell 21 of the circuit breaker, two groups of arc extinguish chambers 37 are arranged at the bottom in the shell 21, and the release 22, the movable contact 23 and the fixed contact 26 are arranged on the top side of the arc extinguish chambers 37. The two groups of arc-extinguishing chambers 37 are respectively a left arc-extinguishing chamber and a right arc-extinguishing chamber, the left side and the right side of the two groups of arc-extinguishing chambers 37 are symmetrically arranged at two ends of the bottom of the shell 21 in the figure, each group of arc-extinguishing chambers 37 comprises a plurality of arc-extinguishing grid pieces 28 which are arranged in a stacked mode at intervals, one end, close to each other, of each two arc-extinguishing chambers 37 is an air inlet, and the other end, far away from each other, of each two arc-extinguishing chambers 37 is an air outlet; the tripper 22 is arranged on the top side of the left arc-extinguishing chamber, the static contact 26 is arranged on the top side of the right arc-extinguishing chamber, the movable contact 23 is located between the tripper 22 and the static contact 26, the swing track of the movable contact 23 during breaking swings from a position close to the right arc-extinguishing chamber to a position close to the left arc-extinguishing chamber, the movable contact 23 is located on the top side of the right arc-extinguishing chamber when being in contact closing with the static contact 26, and the movable contact 23 swings to a fully open position and is located on the top side of the left arc-extinguishing chamber. The two arc striking pieces are respectively a first arc striking piece 42 and a second arc striking piece 43, the first arc striking piece 42 and the second arc striking piece 43 are respectively matched with the static contact 26 and the dynamic contact 23 and are used for respectively leading electric arcs generated when the dynamic contact 23 and the static contact 26 are disconnected into the two arc extinguishing chambers 37, the first arc striking piece 42 is positioned on the top side of the left arc extinguishing chamber and is positioned between the tripper 22 and the left arc extinguishing chamber, and the second arc striking piece 43 is positioned on the top side of the right arc extinguishing chamber and is positioned between the static contact 26 and the right arc extinguishing chamber.

As shown in fig. 1, two air outlets 29 symmetrically disposed are further disposed on the left and right sides of the housing 21, that is, the side walls at the two ends of the housing 21, the two air outlets 29 are respectively and correspondingly matched with the air outlets of the two sets of arc-extinguishing chambers 37, and the air discharged from the air outlets of the two sets of arc-extinguishing chambers 37 is discharged out of the housing 21 through the two air outlets 29. Preferably, guide surfaces 312 are respectively disposed at the upper and lower ends of the air outlets 29 at both sides, and the guide surfaces 312 have an inclined or curved shape to accelerate the discharge of the hot air generated by the arc from the air outlets 29. Preferably, an arc baffle 31 is arranged at the gas outlet 29, a plurality of small vent holes are arranged on the arc baffle 31, and the arc baffle 31 is used for blocking metal particles.

As shown in fig. 1, 5-6, the arc ignition piece includes a contact portion 433 and an arc ignition portion 432 connected by bending, wherein the contact portion 433 of the first arc ignition piece 42 is connected with the stationary contact 26, and the arc ignition portion 432 of the first arc ignition piece 42 extends to above one of the arc extinguishing chambers 37 (right arc extinguishing chamber); the arc corner 32 of the movable contact 23 is in contact fit with the contact portion 433 of the second arc striking plate 43 in the fully open position, and the arc striking portion 432 of the second arc striking plate 43 extends to above another arc extinguishing chamber 37 (left arc extinguishing chamber).

Specifically, the contact portion 433 of the second arc striking plate 43 and the connecting portion 263 of the stationary contact plate 262 located below the stationary contact 261 are welded or connected in other manners, so that the two arc striking portions can be in close contact connection, the arc striking portion 432 of the second arc striking plate 43 extends to the top side of the right arc extinguishing chamber 37 and is substantially parallel to the arc extinguishing grid 28, referring to fig. 1 and 11, the two first magnetism increasing pieces 34 of the first magnetism increasing mechanism correspond to the arc extinguishing grid 28 of the corresponding arc extinguishing chamber 37, the top end side edges of the two first magnetism increasing pieces 34 of the first magnetism increasing mechanism correspond to the side edge of the arc striking portion 432 of the second arc striking plate 43 located at the top side portion of the right arc extinguishing chamber 37, so that the longitudinal cross sections of the arc striking portion 432 of the second arc striking plate 43 located at the top side portion of the right arc extinguishing chamber 37 and the two corresponding first magnetism increasing pieces 34 are U-shaped; the arc angle 32 of the movable contact 23 is in contact fit with the contact part 433 of the first arc striking plate 42 when being in a fully open position, the arc striking part 432 of the first arc striking plate 42 extends to the upper side of the top side of the left arc extinguishing chamber 37, the top end side edges of the two first magnetizing plates 34 correspond to the side edge of the arc striking part 432 of the first arc striking plate 42, which is located at the upper side of the left arc extinguishing chamber 37, and the longitudinal cross sections of the part of the arc striking part 432 of the first arc striking plate 42, which is located above the left arc extinguishing chamber 37, and the corresponding two first magnetizing plates 34 are in a U shape.

As shown in fig. 1, 8 and 10, the arc chute plates 28 at the bottom of the two arc extinguishing chambers 37 are conductive or are integrally formed arc striking structures 27. Specifically, the arc extinguishing bars 28 of two sets of arc extinguishing chambers 37 are installed on two same clapboards 41, and the both sides of the arc extinguishing bars 28 of two sets of arc extinguishing chambers 37 respectively through riveting or other modes with two clapboards 41 are connected, connect through two clapboards 41 and become a whole, not only can reduce the degree of difficulty of assembly, can improve the gas tightness of arc extinguishing chamber 37 moreover, more do benefit to the air-blowing effect to electric arc. Preferably, the separator 41 is a gas-generating insulating material, and the gas-generating insulating material can generate gas on the insulating contact, so as to accelerate the flow of air in the arc-extinguishing chamber 37, and also facilitate the blowing action of the electric arc.

As shown in fig. 4, the arc-extinguishing chamber 37 includes a plurality of arc-extinguishing grid plates 28 arranged at intervals in a stacked manner, at least a part of the arc-extinguishing grid plates 28 of each group of arc-extinguishing chamber 37 is provided with an arc-guiding groove 281 at an end close to another group of arc-extinguishing chamber 37, the arc-guiding grooves 281 of the arc-extinguishing grid plates 28 of the two groups of arc-extinguishing chambers 37 are arranged oppositely, one end of the arc-extinguishing chamber 37 provided with the arc-guiding groove 281 is an air inlet of the arc-extinguishing chamber 37, a diffusion groove 282 communicated with the bottom of the arc-guiding groove 281 is arranged on the arc-extinguishing grid plate 28, the maximum inner diameter of the diffusion groove 282 is greater than the inner diameter of the bottom of the diffusion groove 282, the diffusion groove 282 of the embodiment is circular, or polygonal shape, when an arc moves to the diffusion groove 282 through the arc-guiding groove 281, arc energy can be diffused at the edge of the diffusion groove 282, which is more beneficial for extinguishing the arc. The two groups of arc extinguishing chambers 37 are connected to the arc extinguishing grid plates 28 which are farthest away from the movable contact 23 to form an integral structure, and no arc striking groove 281 is arranged to form the arc striking grid plate 27, in this embodiment, the arc striking grid plate 27 is formed after the two groups of arc extinguishing chambers 37 are connected to the arc extinguishing grid plate 28 which is farthest away from the movable contact 23, and the arc striking grid plate 27 can elongate electric arcs, so that the electric arcs are more favorably extinguished.

As shown in fig. 11, the arc extinguishing mechanism further includes a second magnetism increasing mechanism, the second magnetism increasing structure includes two second magnetism increasing pieces 35 disposed oppositely, and the two second magnetism increasing pieces 35 are disposed on two sides of the movement track of the moving contact at the opening position and the closing position. Further, the second magnetism-increasing piece 35 and the arc striking piece form a second magnetic circuit, and the second magnetic circuit is used for forming a force pushing towards the air inlet direction to the electric arc generated when the moving contact and the static contact are disconnected, so that the speed of extinguishing the electric arc can be further improved. Particularly, the arc striking plate is provided with a combination of the first magnetism increasing mechanism and the second magnetism increasing mechanism, a second magnetic loop formed by the second magnetism increasing mechanism is used for pushing generated electric arcs to enter the arc extinguishing chamber in the direction of the air inlet, the arc striking plate plays a guiding role, and a first magnetic loop formed by the first magnetism increasing mechanism pushes the electric arcs entering the arc extinguishing chamber in the direction of the air outlet so as to accelerate the extinguishing of the electric arcs.

Specifically, the two first magnetizing mechanisms form two first magnetic loops, the two first magnetic loops are a right magnetic loop a and a left magnetic loop b respectively, the right magnetic loop a is formed by a first arc striking plate 42 and first magnetizing plates 34 and arc striking grid plates 27 which are close to two sides of the shell of the first arc striking plate 42, the left magnetic loop b is formed by a second arc striking plate 43 and first magnetizing plates 34 and arc striking plates 27 which are close to two sides of the shell of the second arc striking plate 43, the second magnetic loop c is formed by second magnetizing plates 35 which are close to two sides of the shell, a contact part 433 of the first arc striking plate 42 and the second arc striking plate 43 and a magnetic conduction block 25, and the second magnetic loop c, the right magnetic loop a and the left magnetic loop b can promote electric arcs to move and extinguish rapidly. Preferably, the arc striking plate is provided with an arc striking groove 4 extending towards the corresponding arc extinguishing chamber 37. The arc-striking channel 4 can guide the arc to move towards the arc-extinguishing chamber 37 and accelerate the moving speed of the arc in the arc-extinguishing chamber 37

As shown in fig. 10, the arc extinguishing chamber 37 is disposed inside the housing 21, and the first magnetizing sheet 34 is disposed outside the housing 21. Specifically, the outer sides of the two opposite side walls of the housing 21 are respectively provided with a first groove 46 and a second groove 461, and the first magnetizing sheet 34 and the second magnetizing sheet 35 are respectively installed in the first groove 46 and the second groove 461 and are covered by the insulating plate 36. The first magnetizing sheet 34 and the second magnetizing sheet 35 are disposed outside the housing 21 for easy fixing and installation, and can be reliably isolated from the arc chute 28 inside the housing 21.

As shown in fig. 1, the arc extinguishing mechanism further includes a magnetic conduction block 25, the magnetic conduction block 25 is disposed on a side surface of the static contact 26 away from the movable contact 23 and located between the two second magnetism increasing pieces 35, the two second magnetism increasing pieces 35 are disposed on two sides of the movable contact 23, and correspond to the swing track of the movable contact 23, one end of each of the two second magnetism increasing pieces 35 is correspondingly matched with the side edges of two sides of the magnetic conduction block 25, and the other end of each of the two second magnetism increasing pieces 35 is correspondingly located on two sides of the completely opened position of the movable contact 23. The two second magnetism increasing pieces 35 and the magnetism conductive piece 25 form a U-shaped structure surrounding the static contact 26, that is, the transverse section of the second magnetism increasing mechanism is substantially U-shaped. The second magnetizing mechanism formed by the magnetic conducting block 25 and the two second magnetizing sheets 35 can form a magnetic field around the static contact 26 and the moving contact 23, enhance the magnetic flux density of the magnetic field of the environment around the static contact 26, increase the electrodynamic force for pulling the electric arc to the arc extinguish chamber 37, facilitate the movement of the electric arc to the arc extinguish chamber 37, and reduce the stagnation time of the electric arc.

As shown in fig. 1, the fixed contact 26 includes a contact plate, the contact plate includes an extending portion 264 extending out of the housing 21 and a connecting portion connected to the extending portion 264, a fixed contact 261 is disposed on a side of the connecting portion close to the movable contact 23, the magnetic conductive block 25 is mounted on a side of the connecting portion away from the movable contact 23, and the fixed contact 261 is a silver point.

Preferably, as shown in fig. 1, the housing 21 is formed with a first closed space, a second closed space, a third closed space and a fourth closed space by an insulating structure. The fourth airtight space is located first airtight space, second airtight space and third airtight space below, explosion chamber 37 and first arc piece 42, second arc piece 43 set up in the fourth airtight space.

A rotating shaft 24 connected with the moving contact 23 is arranged in the first closed space, the moving contact 23 is positioned in the first closed space, one end of the moving contact 23 provided with a moving contact extends into the fourth closed space to correspond to the stationary contact 261, and the first closed space and the fourth closed space are isolated from each other by an insulating sliding groove 47 which is arranged on the oscillating baffle 33 which is arranged on the moving contact 23 and is in an arc shape and on the shell 21 and is matched with the oscillating baffle 33 in the moving process of the moving contact 23.

The second enclosed space is located on the right side of the first enclosed space, the static contact 26 is arranged in the second enclosed space, only the static contact 261 of the static contact 26 is exposed in the fourth enclosed space, and the rest part of the static contact is wrapped by the insulating material of the shell 21. The third closed space is located on the left side of the first closed space, a release 22 is arranged in the third closed space, the release 22 is connected with the movable contact 23, the first closed space and the third closed space are separated by a first baffle and a second baffle which are arranged in a staggered mode, and a wiring groove for accommodating the first wiring piece 221 and the second wiring piece 231 is formed between the first baffle and the second baffle, so that insulation separation is achieved, and the first wiring piece 221 and the second wiring piece 231 are assembled and connected. In the embodiment, four relatively independent closed spaces are used, so that the electric arc and high-temperature gas and particles generated by the electric arc can be prevented from entering the structures of the movable contact 23, the fixed contact 26 and the release 22, and the electric arc tripper has good isolation and insulation functions.

Specifically, as shown in fig. 1, the moving contact 23 is mounted on the rotating shaft 24, a moving slot is disposed in the housing 21 between the rotating shaft 24 and the arc extinguish chamber 37, the moving slot is used for moving the moving contact 23, and an insulating structure is disposed around the moving slot, and the insulating structure can prevent electric arcs and high-temperature gas and particles generated by the electric arcs from entering other parts of the housing 21 from the moving slot. As shown in fig. 3, the insulating structure includes a swing baffle 33 disposed on the movable contact 23 and having an arc shape, an insulating chute 47 disposed on the housing 21 and engaged with the swing baffle 33, and the swing baffle 33 is isolated from the arc extinguishing chamber 37 during the movement of the movable contact 23.

As shown in fig. 1, the shell 21 is provided with a release 22 connected to the movable contact 23 at one side of the rotating shaft 24, the release is connected to the first lug 221, the movable contact 23 is connected to the second lug 231, the first lug 221 is connected to the second lug 231, the insulating structure includes a first baffle and a second baffle which are arranged in a staggered manner, a wiring slot for accommodating the first lug 221 and the second lug 231 is formed between the first baffle and the second baffle, the wiring slot is only used for accommodating the wiring board 221 and the wiring board 231, the rest is separated by the first baffle and the second baffle, and the space of the release 22 is separated from the space of the arc extinguish chamber 37 by an insulating material, so as to avoid direct communication between the two. Through the insulation structure around the moving groove, the arc-extinguishing device is not only more beneficial to the rapid transfer and extinguishing of the arc, but also beneficial to the discharge of high-temperature gas generated by the arc from the gas outlets 29 at the two sides of the shell 21, and can also prevent the high-temperature gas and particles generated by the arc from entering the rotating shaft and the tripper part to cause damage.

As shown in fig. 4 and 8, in this solution, the arc-extinguishing grid 28 has the second protrusion 283, the arc-striking grid 27 has the first protrusion 273, the first protrusion 273 and the second protrusion 283 are inserted into the corresponding holes of the partition plates 41, the second protrusions 283 are respectively provided on two sides of the same arc-extinguishing grid 28, the first protrusions 273 are provided on two sides of the arc-striking grid 27, and after the arc-extinguishing grid 28 and the arc-striking grid 27 are assembled, the partition plates 41 on two sides are assembled into the integral arc-extinguishing chamber 37. As shown in fig. 6, the integral arc chute groups formed by mounting all the arc chute plates 28 together are more convenient to mount, and meanwhile, the integral arc chute plate groups 28 have better air tightness and are more beneficial to the blowing action of the electric arc.

As shown in fig. 1, the two air outlets 29 on both sides of the arc-extinguishing chamber 37 are in a direction perpendicular to the arc-extinguishing grid pieces, the air outlets 29 are located at the middle position of the corresponding arc-extinguishing chamber 37 along the arrangement direction of the arc-extinguishing grid pieces 28, the air outlets 29 on both sides are arranged in a left-right symmetrical manner, and the upper and lower ends of the air outlets 29 on both sides are respectively provided with a guide surface 312 in the shape of an inclined surface or a curved surface, which is beneficial for discharging hot air generated along with electric arc from the air outlets 29.

As shown by the dotted lines in fig. 10-11, when a short-circuit current is generated in the line, due to a repulsive force generated by a reverse current between the movable contact 23 and the fixed contact 26, the movable contact 23 opens around the pivot 331 (fig. 3) and stretches an arc, the arc generated between the movable contact 23 and the fixed contact 26 is acted by a lorentz force of the current, an arc root on one side of the arc moves from the fixed contact 261 to the second arc striking plate 43 connected to the fixed terminal plate 26, an arc root on the other side of the arc moves toward the arc angle 32 on the movable contact 23 along with the opening direction of the movable contact 23, and the arc is subjected to a force that causes the arc to move toward the arc extinguishing chamber 37. When the movable contact 23 is fully opened to the position of the striking plate 42, the arc is transferred from the arc angle 32 of the movable contact 23 to the striking plate 42, and the arc completely enters the arc extinguishing chamber 37 until being extinguished.

This embodiment utilizes run-on piece and the second that sets up in the casing lateral wall outside to increase magnetic mechanism, is favorable to accelerating the speed and the convenient assembling that electric arc extinguishes, can understand, interior magnetic structure also can not utilize current run-on piece, but sets up interior magnetic structure in the side of run-on piece alone, also belongs to the utility model discloses a scope of protection.

It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings or the directions or positional relationships that are usually placed when used, and are only for convenience of description, but do not indicate that the device or element to be referred to must have a specific direction, 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 one description from another, and are not to be construed as indicating relative importance.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model discloses to the ordinary skilled person in technical field's the prerequisite that does not deviate from the utility model discloses under the design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (19)

1. The utility model provides an arc extinguishing mechanism, includes explosion chamber (37), explosion chamber (37) include two baffles (41) and set up a plurality of arc chute pieces (28) between two baffles (41), be equipped with at arc chute piece (28) top with moving contact (23) or static contact (26) complex striking piece, its characterized in that: arc extinguishing mechanism still includes the first magnetism mechanism that increases, the first magnetism mechanism that increases is including relative two first magnetism pieces (34) that set up in a plurality of arc extinguishing bars piece (28) both sides, and sets up arc striking structure (27) of arc extinguishing bars piece (28) bottom, first magnetism piece (34) parallel baffle (41), first magnetism piece (34), arc striking structure (27) with the arc striking piece forms first magnetic circuit, first magnetic circuit is used for producing the power that promotes to the gas vent direction of explosion chamber (37) to the electric arc that gets into explosion chamber (37).

2. An arc extinguishing mechanism according to claim 1, characterized in that: the magnetic field amplifying device comprises two arc-extinguishing chambers (37), wherein the two arc-extinguishing chambers (37) are provided with the first magnetism-increasing mechanisms.

3. The arc extinguishing mechanism of claim 2, wherein: arc extinguishing bars (28) of two explosion chambers (37) bottom switch on and constitute arc starting structure (27) or arc extinguishing bars (28) integrated into one piece of two explosion chambers (37) bottom constitutes arc starting structure (27).

4. An arc extinguishing mechanism according to any of claims 1-3, characterized in that: the arc extinguishing mechanism further comprises a second magnetism increasing mechanism, the second magnetism increasing mechanism comprises two second magnetism increasing pieces (35) which are oppositely arranged, and the two second magnetism increasing pieces (35) are arranged on two sides of a motion track of an opening position and a closing position of the moving contact (23).

5. An arc extinguishing mechanism according to claim 4, characterized in that: the second magnetism increasing sheet (35) and the arc striking sheet form a second magnetic loop, and the second magnetic loop is used for forming a force for pushing the arc generated in the breaking process to the direction of an air inlet of the arc extinguishing chamber (37).

6. The arc extinguishing mechanism of claim 1, wherein: the arc extinguishing chamber (37) is arranged on the inner side of the shell (21), and the first magnetism increasing piece (34) is arranged on the outer side of the shell (21).

7. The arc extinguishing mechanism of claim 1, wherein: the magnetic conduction block (25) is arranged on the side face, far away from the moving contact (23), of the static contact (26) and located between the two second magnetism increasing pieces (35).

8. The arc extinguishing mechanism of claim 7, wherein: the static contact (26) comprises a contact plate, the contact plate comprises a connecting part provided with a static contact (261), and the magnetic conduction block (25) is arranged on the side face, far away from the moving contact (23), of the connecting part.

9. The arc extinguishing mechanism of claim 2, wherein: the device comprises two arc striking pieces, wherein the two arc striking pieces are respectively a first arc striking piece (42) and a second arc striking piece (43), and the first arc striking piece (42) and the second arc striking piece (43) are respectively matched with a static contact (26) and a moving contact (23); the arc striking piece comprises a contact part (433) and an arc striking part (432) which are connected in a bending mode, the contact part (433) of the first arc striking piece (42) is connected with the static contact (26), and the arc striking part (432) of the first arc striking piece (42) extends to the upper side of one arc extinguishing chamber (37); when the arc angle (32) of the moving contact (23) is in a fully open position, the arc angle is in contact fit with a contact part (433) of the second arc striking piece (43), and an arc striking part (432) of the second arc striking piece (43) extends to the position above the other arc extinguishing chamber (37).

10. The arc extinguishing mechanism of claim 1, wherein: an arc striking groove (4) is arranged on the arc striking sheet.

11. The arc extinguishing mechanism of claim 6, wherein: the outer sides of two opposite side walls of the shell (21) are respectively provided with a first groove (46) and a second groove (461), and the first magnetism increasing piece (34) and the second magnetism increasing piece (35) are respectively arranged in the first groove (46) and the second groove (461) and are covered by an insulating plate (36).

12. An arc extinguishing mechanism according to claim 2, characterized in that: the one end that two explosion chambers (37) are close to each other is the air inlet, and the one end of keeping away from each other is the gas vent, and two sets of explosion chambers (37) are symmetrical arrangement in casing (21) bottom both ends, the both ends lateral wall of casing (21) is equipped with two gas outlets (29) that the symmetry set up, and two gas outlets (29) correspond with the gas vent of two sets of explosion chambers (37) respectively.

13. The arc extinguishing mechanism of claim 12, wherein: guide surfaces (312) are respectively arranged at the upper end and the lower end of the air outlets (29) at the two sides, and the guide surfaces (312) are inclined surfaces or curved surfaces.

14. An arc extinguishing mechanism according to claim 2, characterized in that: at least part of arc-extinguishing grid plates (28) of each group of arc-extinguishing chambers (37) are respectively provided with an arc-striking groove (281) at the end part close to the other group of arc-extinguishing chambers (37), the arc-extinguishing grid plates (28) are provided with diffusion grooves (282) communicated with the bottoms of the arc-striking grooves (281), and the maximum inner diameter of the diffusion grooves (282) is larger than the inner diameter of the bottoms of the diffusion grooves (282).

15. An arc extinguishing mechanism according to claim 2, characterized in that: the two groups of arc extinguish chambers (37) are symmetrically arranged at two ends of the bottom of the shell (21); the release (22) is arranged on the top side of one group of the arc-extinguishing chambers (37), the fixed contact (26) is arranged on the top side of the other group of the arc-extinguishing chambers (37), and the movable contact (23) is positioned between the release (22) and the fixed contact (26).

16. The arc extinguishing mechanism of claim 15, wherein: the arc-shaped switch is characterized in that a fourth closed space for accommodating an arc extinguish chamber (37) is arranged in the shell (21), a first closed space for accommodating the moving contact (23) is arranged in the first closed space, a rotating shaft (24) connected with the moving contact (23) is arranged in the first closed space, the moving contact (23) is positioned in the first closed space, one end, provided with a moving contact, of the moving contact (23) extends into the fourth closed space, an insulation sliding groove (47) matched with the swing baffle (33) is formed in the first closed space and the fourth closed space through a swing baffle (33) and the shell (21) which are arranged on the moving contact (23) and are in an arc-shaped shape, and the insulation separation between the first closed space and the fourth closed space is realized in the moving process of the moving contact (23).

17. The arc extinguishing mechanism of claim 16, wherein: a second closed space for accommodating the static contact (26) is arranged in the shell (21), the static contact (26) is arranged in the second closed space, and only the static contact (261) of the static contact (26) is exposed in the fourth closed space.

18. The arc extinguishing mechanism of claim 16, wherein: the shell (21) is internally provided with a third closed space for containing a release (22), the release (22) is connected with a first wiring sheet (221), the movable contact (23) is connected with a second wiring sheet (231), the first wiring sheet (221) is connected with the second wiring sheet (231), the first closed space and the third closed space are separated by a first baffle and a second baffle which are arranged in a staggered mode, and a wiring groove for containing the first wiring sheet (221) and the second wiring sheet (231) is formed between the first baffle and the second baffle.

19. The arc extinguishing mechanism of claim 2, wherein: arc extinguishing grid plates (28) of the two groups of arc extinguishing chambers (37) are arranged on two oppositely arranged partition plates (41).

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