CN218769372U - Arc extinguishing mechanism and plug-in circuit breaker - Google Patents

Abstract

An arc extinguishing mechanism and a plug-in circuit breaker comprise an arc extinguishing chamber, exhaust holes formed in a shell and a plurality of buffer chambers which are arranged side by side and communicated with each other, wherein the plurality of buffer chambers are located between an exhaust end and the exhaust holes of the arc extinguishing chamber, and two ends of each buffer chamber are respectively connected with the exhaust end and the exhaust holes; the direction from the exhaust end of the arc extinguish chamber to the exhaust hole is a first direction, the buffer chamber is provided with a baffle, the baffle and the first direction are arranged at an included angle to block metal particles in the arc gas, at least part of the baffle is arranged in the buffer chamber, and the bulge is arranged on the side wall of the buffer chamber and extends into the buffer chamber. The utility model discloses set up a plurality of buffer chambers that just communicate each other side by side in one side of explosion chamber, do benefit to the pressure that releases the explosion chamber, make combustion gas pressure obtain the buffering, be favorable to the arc extinguishing, simultaneously, set up the baffle at the buffer chamber, block the metal particle that electric arc power produced by the baffle, avoid the outside that metal particle sprays the circuit breaker.

Description

Arc extinguishing mechanism and plug-in circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field, concretely relates to arc extinguishing mechanism and plug-in circuit breaker.

Background

In recent years, with the development of communication technology, plug-in circuit breakers have been widely used, and therefore, the structure and function of the plug-in circuit breaker have been increasingly emphasized. In the circuit breaker, the static contact and the moving contact can produce electric arc in the separation process, because electric arc is a gas discharge phenomenon, its high temperature high conductive characteristic for electric arc if can not in time extinguish, light then to the contact produce serious ablation, so the electric arc can't extinguish and lead to the unable normal breaking of circuit, thereby bring important incident, at present, conventional circuit breaker mainly utilizes the explosion chamber to carry out the arc extinguishing, nevertheless because the structural design of current explosion chamber makes its arc extinguishing effect and the short-circuit current's that can extinguish scope not ideal enough.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a simple structure, the high and effectual arc extinguishing mechanism and the bayonet circuit breaker of arc extinguishing of reliability.

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

an arc extinguishing mechanism comprises an arc extinguishing chamber, exhaust holes formed in a shell and a plurality of buffer chambers arranged side by side and communicated with each other, wherein the plurality of buffer chambers are located between an exhaust end and the exhaust holes of the arc extinguishing chamber, and two ends of each buffer chamber are respectively connected with the exhaust end and the exhaust holes;

the direction from the exhaust end of the arc extinguish chamber to the exhaust hole is a first direction, the buffer chamber is provided with a baffle, the baffle and the first direction are arranged at an included angle to block metal particles in the arc gas, at least part of the baffle is arranged in the buffer chamber, and the bulge is arranged on the side wall of the buffer chamber and extends into the buffer chamber.

Further, leave first intercommunication space between the exhaust end of a plurality of surge chambers and explosion chamber, leave second intercommunication space between a plurality of surge chambers and exhaust hole, first intercommunication space is with a plurality of the surge chamber all communicates, and second intercommunication space and a plurality of the surge chamber all communicates.

Furthermore, a pair of separating ribs are convexly arranged on the inner side wall of the shell between the exhaust hole and the exhaust end of the arc extinguish chamber, the space in the shell is divided into a first buffer chamber, a second buffer chamber and a third buffer chamber which are parallel by the pair of separating ribs, the end parts of the pair of separating ribs, which are close to the arc extinguish chamber, are oppositely bent to form first baffle plates, a gap between the two first baffle plates is an inlet of the second buffer chamber, a first communicating space is reserved between the first baffle plates and the exhaust end of the arc extinguish chamber, and the inlets of the first buffer chamber, the second buffer chamber and the third buffer chamber are communicated through the first communicating space;

the end part of one end, close to the exhaust hole, of the pair of partition ribs is bent to form a second baffle, a gap between the two second baffles is an outlet of the second buffer chamber, a second communication space is reserved between the outlet of the second buffer chamber and the exhaust hole, and outlets of the first buffer chamber, the second buffer chamber and the third buffer chamber are communicated through the second communication space.

Furthermore, a pair of blocking parts are arranged in the second communication space, the blocking parts correspond to the space between the outlet of the second buffer chamber and the exhaust hole, and third baffle plates matched with the second baffle plates are respectively arranged on the side walls of the first buffer chamber and the third buffer chamber.

Further, the space of the second buffer chamber is larger than the space of the first buffer chamber and the third buffer chamber, and the inner diameter of the inlet of the second buffer chamber is smaller than the inner diameter of the inlet of the first buffer chamber and the third buffer chamber.

Further, still include the flash barrier, the flash barrier sets up between the arc end of advancing of explosion chamber and contact mechanism, is equipped with a plurality of flash barriers at the surperficial protrusion of flash barrier, and two adjacent intervals that separate between the flash barriers form the water conservancy diversion passageway, and contact mechanism's moving contact is range upon range of to be set up in the top of a plurality of flash barriers at least.

Further, the middle part of separating the arc muscle is buckled, makes the water conservancy diversion passageway that two adjacent separate arc muscle cooperations formed include first water conservancy diversion section and second water conservancy diversion section, the one end intercommunication of first water conservancy diversion section and second water conservancy diversion section forms the contained angle, and the one end of first water conservancy diversion section extends the avris of separating the arc wall, and the other end of second water conservancy diversion section is just right with the inlet arc end of explosion chamber.

Further, the arc isolation ribs are arranged on the surfaces of the front side and the back side of the arc isolation wall in a protruding mode, a first limiting groove is formed in the inner side wall of the shell between the contact mechanism and the arc extinguish chamber, and the arc isolation ribs and the first limiting groove are matched to limit the arc isolation wall.

Furthermore, a pair of limiting convex ribs are arranged on the inner side wall of the shell between the contact mechanism and the arc extinguish chamber in a protruding mode, a gap between the limiting convex ribs is a first limiting groove, one of the arc isolating ribs is matched with the first limiting groove, and the adjacent arc isolating ribs are in dislocation fit with the limiting convex ribs.

Furthermore, the side of the arc wall is provided with a first positioning part, and the inner side wall of the shell of the circuit breaker is provided with a second limiting part which is in limiting fit with the first positioning part.

Further, one side of the arc isolating wall back to the contact mechanism is provided with an arc isolating plate in a laminating mode.

Furthermore, still include a pair of striking piece, a pair of striking piece sets up and is fixed with the inside wall cooperation of shell along the both sides of explosion chamber respectively.

Further, the explosion chamber includes support and a plurality of arc extinguishing bars piece, and a plurality of arc extinguishing bars piece range upon range of sets up on the support, and the one end that the support was kept away from to the arc extinguishing bars piece is equipped with the breach as the end of explosion chamber, and the one end that the breach was kept away from to the support is equipped with the venthole as the exhaust end of explosion chamber.

The utility model also provides a plug-in circuit breaker, include the shell and set up the contact mechanism in the shell the one end cooperation of contact mechanism is provided with as above arc extinguishing mechanism.

The utility model discloses an arc extinguishing mechanism and applied this arc extinguishing mechanism's bayonet circuit breaker sets up a plurality of surge chambers that just communicate each other side by side in one side of explosion chamber, does benefit to the pressure that releases the explosion chamber, makes combustion gas pressure obtain the buffering, is favorable to the arc extinguishing, sets up the baffle at the surge chamber simultaneously, blocks the metal granules that electric arc power produced by the baffle, avoids the metal granules to spray the outside of circuit breaker.

In addition, the arc isolation ribs are arranged on the arc isolation wall in a protruding mode, the creepage distance is increased through the arc isolation ribs, and the two adjacent arc striking ribs form a flow guide channel which can guide arc gas to move towards the arc extinguishing chamber, so that arc discharge is reduced, and the arc extinguishing effect is optimized; in addition, the arc isolation ribs can be matched with the shell to position the arc isolation wall.

Drawings

Fig. 1 is a schematic structural view of an arc extinguishing mechanism (including a first structure of an arc striking plate) according to the present invention;

fig. 2 is a schematic structural diagram of an arc extinguishing mechanism (including a second structure of an arc striking plate) according to the present invention;

FIG. 3 is a schematic view of the structure of the housing of the present invention;

FIG. 4 is a schematic view of the structure of the middle partition wall of the present invention;

fig. 5 is a schematic structural view of the septal arc wall of the present invention (the side opposite to the contact mechanism);

fig. 6 is a schematic structural diagram of the arc-extinguishing chamber in the present invention;

FIG. 7 is a schematic structural view of a first embodiment of the middle arc runner of the present invention;

fig. 8 is a schematic structural view of a second embodiment of the middle arc runner of the present invention.

Detailed Description

The following describes the arc extinguishing mechanism of the plug-in circuit breaker and the specific embodiments of the plug-in circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 8. The arc extinguishing mechanism of the plug-in type circuit breaker and the plug-in type circuit breaker of the present invention are not limited to the description of the following embodiments.

As shown in fig. 1-3, the circuit breaker of this embodiment is a plug-in circuit breaker, and includes a housing 1, where one end of the housing 1 is used as an operating end and is provided with an operating element, the other end of the housing 1 is used as a wiring end and is provided with a wiring terminal, the wiring terminal is provided with a wiring port, the wiring terminal is assembled in the wiring port, and the wiring terminal and an external wire are connected in a plug-in connection manner; an operating mechanism, a contact mechanism and an arc extinguishing mechanism are assembled in the shell 1 between the operating end and the wiring terminal, the operating mechanism is positioned between the contact mechanism and the operating part, the contact mechanism comprises a moving contact 21 and a static contact which are matched with each other, the operating part, the operating mechanism and the moving contact 21 are sequentially connected in a linkage manner, the operating part drives the moving contact 21 to move towards or away from the static contact, so that the switching-on and switching-off of the circuit breaker are realized, and the operating part is a button or a handle; the arc extinguishing mechanism is arranged between the wiring end and the contact mechanism in a matching mode and is used for extinguishing electric arcs generated when the contact mechanism is switched on and switched off. The arc extinguishing mechanism comprises an arc isolating wall 32, an arc isolating plate, an arc extinguishing chamber 31, a pair of arc striking sheets and an exhaust hole 35 arranged on the shell 1, wherein the arc isolating plate and the arc isolating wall 32 are arranged between the contact mechanism and the arc inlet end of the arc extinguishing chamber 31 in a matching manner, the exhaust end of the arc extinguishing chamber 31 is connected with the exhaust hole 35 to exhaust arc tail gas out of the shell 1, and the pair of arc striking sheets are arranged on two sides (upper side and lower side in the figure) of the arc extinguishing chamber 31 in a matching manner and used for introducing electric arc into the arc extinguishing chamber 31; and a protection mechanism can be arranged between the wiring terminal and the operating end, the protection mechanism comprises a short-circuit protection mechanism and/or an overload protection mechanism, and preferably, the short-circuit protection mechanism and the overload protection mechanism are respectively matched and arranged at two sides of the operating mechanism and along the side of the shell 1 so as to avoid occupying excessive internal space.

An improvement point of this application lies in, be provided with a plurality of buffers that just communicate each other side by side at the exhaust end of explosion chamber 31, the buffer is located between the exhaust end of explosion chamber 31 and exhaust hole 35, the both ends of every buffer respectively with the exhaust end, exhaust hole 35 links up, set up a plurality of buffers that just communicate each other side by side through one side at explosion chamber 31, do benefit to the pressure of release explosion chamber 31, make the exhaust gas pressure obtain the buffering, be favorable to the arc extinguishing.

Preferably, the direction from the exhaust end of explosion chamber 31 to exhaust hole 35 is first direction, the surge chamber is provided with the baffle, and the baffle is the contained angle setting with first direction and is arranged in blockking the metal particle among the electric arc gas, blocks the metal particle that electric arc power produced by the baffle, avoids the metal particle to spray the outside of circuit breaker. Preferably, at least part of the baffle is located in the buffer chamber, and the protrusion is arranged on the side wall of the buffer chamber and extends into the buffer chamber.

4-5, the arc isolating wall 32 is disposed between the contact mechanism and the arc inlet end of the arc extinguishing chamber 31, a plurality of arc isolating ribs 321 are protruded from the surface of the arc isolating wall 32, a flow guide channel 322 is formed at an interval between two adjacent arc isolating ribs 321, the contact mechanism is stacked above the plurality of arc isolating ribs 321, the creepage distance is increased by the arc isolating ribs 321, and the flow guide channel 322 formed by two adjacent arc striking ribs can guide the arc gas to move towards the arc extinguishing chamber 31, reduce arc discharge, and optimize the arc extinguishing effect; preferably, the arc isolation ribs 321 are protruded on the front side surface and the back side surface of the arc isolation wall 32, the first limiting groove 11 is arranged on the inner side wall of the housing 1 between the contact mechanism and the arc extinguish chamber 31, and the arc isolation ribs 321 and the first limiting groove 11 are matched to limit the arc isolation wall 32, so that the arc isolation wall 32 is favorably and stably assembled in the housing 1.

Another improvement of the present application lies in the arc striking sheet, as shown in fig. 7-8, the arc striking sheet includes an arc striking sheet body, wherein the middle portion of the arc striking sheet body is folded back to form a connecting portion 343, so that the arc striking sheet body is divided into a first plate 341 and a second plate 342, which have opposite plate surfaces by the connecting portion 343, this folded-back structure is favorable for being assembled in a gap of the housing 1, and reduces the space occupied by the arc striking sheet inside the housing 1, an arc striking plate 348 is connected to the end of the first plate 341, the arc striking plate 348 is used for being matched with the arc extinguishing chamber 31 to enhance the arc extinguishing effect of the arc striking sheet, a first fixing portion 345 is arranged at a side of the second plate 342, a second fixing portion 346 is arranged at a side of the arc striking sheet body close to the connecting portion 343, and is matched and fixed with the housing 1 through the first fixing portion 345 and the second fixing portion 346, which is favorable for stable assembly of the arc striking sheet.

Preferably, the end of the second plate 342 corresponds to the middle of the first plate 341 and is provided with a first fixing portion 345, and the side of the first fixing portion 345 and/or the second fixing portion 346 is flush with the side of the arc ignition plate 348, which is beneficial to ensuring the balance of the arc ignition plate 348, so that the arc ignition plate is stably assembled in the circuit breaker. In addition, the end of the second plate 342 is provided with a connecting hole 347, and the connecting hole 347 can be matched and connected with the adjusting screw 42 of the overload protection mechanism.

Specific embodiments of a plug-in circuit breaker are provided in connection with fig. 1-8.

As shown in fig. 1-3, a contact mechanism is assembled inside the housing 1 near the operating end, a pair of wiring ports are arranged at the wiring end of the housing 1, the direction from the operating end to the wiring end of the housing 1 is the length direction of the circuit breaker, the pair of wiring ports are respectively positioned at the upper side and the lower side of the housing 1 in the height direction of the circuit breaker, an exhaust hole 35 is arranged at the end wall of the housing 1 between the two wiring ports, the operating element, the operating mechanism and the contact mechanism are arranged inside the housing 1 near the operating end, an overload protection mechanism is arranged along one side of the housing 1, the overload protection mechanism is arranged along the upper side of the housing 1 in the figure, and the overload protection mechanism is connected with one of the wiring terminals; set up arc extinguishing mechanism between contact mechanism and exhaust hole 35, arc extinguishing mechanism includes explosion chamber 31, the flash barrier 32, the flash barrier, a pair of run-on plate and three buffer chamber that just communicates each other side by side, wherein explosion chamber 31 sets up in the middle part of shell 1, flash barrier 32 and flash barrier range upon range of setting between the arc end that advances of contact mechanism and explosion chamber 31, three buffer chamber link up side by side between the exhaust end and the exhaust hole 35 of explosion chamber 31, a pair of run-on plate sets up respectively in the upper and lower both sides of explosion chamber 31 and fixed with the inside wall cooperation of shell 1 on the direction of height of circuit breaker, wherein the one end and the contact mechanism of run-on plate are connected, the other end extends to the both sides of explosion chamber 31, do benefit to and introduce arc in the explosion chamber 31.

As shown in fig. 1-3, the surge chamber that is located between explosion chamber 31 and exhaust hole 35 is separated by the muscle that separates in the shell 1 and forms, is provided with a pair of muscle that separates in the shell 1 between two wiring mouths promptly, is three buffer chamber side by a pair of muscle that separates the space separation in the shell 1, leaves first intercommunication space between the exhaust end of three buffer chamber and explosion chamber 31, leaves second intercommunication space between three buffer chamber and exhaust hole 35, first intercommunication space and a plurality of the buffer chamber all communicates, second intercommunication space and a plurality of the buffer chamber all communicates. In the embodiment, the three buffer chambers are a first buffer chamber 331, a second buffer chamber 332 and a third buffer chamber 333 in sequence from bottom to top, wherein the space of the second buffer chamber 332 is the largest, that is, the space of the second buffer chamber 332 is greater than the spaces of the first buffer chamber 331 and the third buffer chamber 333, the inlet of the second buffer chamber 332 corresponds to the middle position of the exhaust end of the arc-extinguishing chamber 31, the inlets of the first buffer chamber 331 and the third buffer chamber 333 correspond to the two sides of the exhaust end of the arc-extinguishing chamber 31, respectively, the second buffer chamber 332 with the largest space can prevent gas from flowing back, if the space of the second buffer chamber 332 is smaller than that of the first buffer chamber 331 and the third buffer chamber 333, the rate of gas flowing back to the second buffer chamber 332 is increased when the gas collected at the gas outlet 35 is discharged, and the ends of the pair of spacers near the arc extinguishing chamber 31 are bent toward each other to form the first baffle 334, the gap between the first baffles 334 is the inlet of the second buffer chamber 332, and in fig. 1 and 2, the inner diameter of the inlet of the second buffer chamber 332 is the smallest, that is, the inner diameter of the inlet of the second buffer chamber 332 is smaller than the inner diameters of the inlets of the first buffer chamber 331 and the third buffer chamber 333, so that the gas can flow toward the first buffer chamber 331 and the third buffer chamber 333 as much as possible, the extended gas flow path facilitates cooling of the gas, slows down the movement speed thereof as much as possible, facilitates achieving split buffering of the three buffer chambers, and facilitates maintaining the arc gas in the second buffer chamber 332 for a long time, meanwhile, most of ionized metal particles move to two sides to increase the movement distance and block the gas from flowing back, a first communication space is left between the first baffle 334 and the exhaust end of the arc extinguishing chamber 31, and inlets of the first buffer chamber 331, the second buffer chamber 332, and the third buffer chamber 333 communicate through the first communication space.

The end parts of the pair of separating ribs close to one end of the exhaust hole 35 are bent to form second baffles 335, a gap between the two second baffles 335 is an outlet of the second buffer chamber 332, a second communicating space is reserved between the outlet of the second buffer chamber 332 and the exhaust hole 35, outlets of the first buffer chamber 331, the second buffer chamber 332 and the third buffer chamber 333 are communicated through the second communicating space, a separating part is arranged in the second communicating space and located between the outlet of the second buffer chamber 332 and the exhaust hole 35, the separating part divides the outlet of the second buffer chamber 332, so that gas in the second buffer chamber 332 flows out from two sides of the separating part, in fig. 1-3, the separating part comprises a pair of fourth baffles 337 corresponding to two sides of the exhaust hole 35, the fourth baffles 337 prevent arc gas in the second buffer chamber 332 from being directly exhausted from the exhaust hole 35, and third baffles 336 matched with the second baffles 335 are respectively arranged on side walls of the first buffer chamber 331 and the third buffer chamber 333.

As shown in fig. 1, 2, 4 and 5, the cooperation of arc wall 32 sets up between the arc end of advancing and the contact mechanism of explosion chamber 31, surface protrusion at arc wall 32 is equipped with a plurality of arc muscle 321 that separate, adjacent two separate the interval between the arc muscle 321 and form water conservancy diversion passageway 322, in the thickness direction of circuit breaker, at least, contact mechanism's moving contact 21 stacks up and sets up in the top of a plurality of arc muscle 321 that separate, that is, a plurality of arc muscle 321 correspond the one end that sets up at arc wall 32 and keep away from explosion chamber 31, moving contact 21's swing orbit corresponds the top at a plurality of arc muscle 321 that separate, a plurality of arc muscle 321 can increase creepage distance, water conservancy diversion passageway 322 can guide the direction motion of arc gas to explosion chamber 31, reduce arc discharge, optimize the arc extinguishing effect.

As shown in fig. 4 and 5, the middle of each arc-isolating rib 321 is bent, so that the flow guide channel 322 formed by two adjacent arc-isolating ribs 321 in a matching manner includes a first flow guide section 323 and a second flow guide section 324, the first flow guide section 323 is communicated with one end of the second flow guide section 324 to form an included angle, one end of the first flow guide section 323 extends to the side of the arc-isolating wall 32, and the other end of the second flow guide section 324 is opposite to the arc-entering end of the arc-extinguishing chamber 31; as shown in fig. 3 and 5, the arc separating ribs 321 are convexly disposed on the front and back surfaces of the arc separating wall 32, the inner side wall of the housing 1 between the contact mechanism and the arc extinguish chamber 31 is provided with a first limiting groove 11, the arc separating ribs 321 and the first limiting groove 11 cooperate with the limiting arc separating wall 32, in this embodiment, one end of the arc separating wall 32 close to the movable contact 21 is provided with three parallel arc separating ribs 321, correspondingly, the inner side wall of the housing 1 between the contact mechanism and the arc extinguish chamber 31 is convexly provided with a pair of limiting convex ribs 111, a gap between the pair of limiting convex ribs 111 is the first limiting groove 11, one of the arc separating ribs 321 cooperates with the first limiting groove 11, the adjacent arc separating ribs 321 cooperate with the limiting convex ribs 111 in a staggered manner, in this embodiment, the arc separating rib 321 located in the middle position cooperates with the first limiting groove 11, the gap between the first limiting groove 11 is slightly larger than the width of the arc separating rib 321, the other two arc separating ribs 321 and the limiting convex ribs 111 are staggered, as a matter, the arc separating ribs 321 may also have other shapes, and the cooperation between the arc separating ribs 321 and the first limiting groove 11 is not limited to the insertion connection. In addition, a first positioning portion 325 may be further disposed at the side of the arc barrier 32, preferably, the first positioning portion 325 is formed by protruding the edge of the arc barrier 32, the number and shape of the first positioning portions 325 are not particularly limited, correspondingly, a second positioning portion 112 that is matched with the first positioning portion 325 is disposed on the inner side wall of the housing 1, in fig. 3, the second positioning portion 112 is a groove structure, and the first positioning portion 325 may be matched with the second positioning portion 112 in an inserting manner.

The flash barrier (not shown) is range upon range of in the thickness direction of circuit breaker and is set up in the one side that the contact mechanism is dorsad to flash barrier 32, in this embodiment, flash barrier 321 protrusion sets up in the positive and negative both sides of flash barrier 32 and is located the one end of keeping away from explosion chamber 31, thus, form the clearance between the inside wall that flash barrier 32 is close to explosion chamber 31 one end and shell 1, the flash barrier is range upon range of and is set up in this clearance, flash barrier 32 is made by producing the gas material, can produce gas under high temperature, thereby make the pressure of contact mechanism one end be greater than the pressure of gas vent, the process that the arc gas moved to the gas outlet can make electric arc elongate, thereby reach the effect of air-blast arc extinguishing, cooperate flash barrier and arc ignition piece again, make electric arc flow in the explosion chamber 31, the effect of magnetic-blast arc extinguishing has been reached.

As shown in fig. 1, 2 and 6, explosion chamber 31 includes support 311 and a plurality of arc extinguishing bars piece 312, the both ends of support 311 are opened, a plurality of arc extinguishing bars piece 312 range upon range of and set up on support 311, be located between the open both ends of support 311, a plurality of arc extinguishing bars piece 312 can break the cutting of electric arc into the multistage short arc, make electric arc recovery voltage improve power voltage even higher than power voltage fast, thereby play the effect to the electric arc current-limiting in order to accelerate the arc extinguishing, the one end that support 311 was kept away from to arc extinguishing bars piece 312 is equipped with breach 313 as the arc inlet end of explosion chamber 31, breach 313 is located the one side relative with contact mechanism, the one end of keeping away from breach 313 at support 311 is equipped with the venthole as the exhaust end of explosion chamber 31. In this embodiment, the arc extinguishing chamber 31 is inclined relative to the length direction of the circuit breaker, the length of part of the arc extinguishing grid pieces 312 is smaller, and the arc extinguishing grid pieces 312 with smaller length are stacked on the upper side of the bracket 311, so that the arc extinguishing chamber 31 enters the arc end and gradually protrudes out of the bracket 311 from the upper side to the lower side, which is not only beneficial to the arc entering the arc extinguishing chamber 31, but also beneficial to the arc extinguishing chamber 31 being assembled in the housing 1.

In this embodiment, a pair of arc striking pieces are arranged along two sides of the housing 1 and used for being matched with the arc extinguish chamber 31, in fig. 1 and 2, the arc striking piece arranged on the upper side of the arc extinguish chamber 31 is a first arc striking piece 34a, and the arc striking piece arranged on the lower side of the arc extinguish chamber 31 is a second arc striking piece 34 b.

In the first structure of the first arc tab 34a in this embodiment, the first arc tab 34a includes an arc tab body, the arc tab body is integrally a plate-shaped structure, a connecting portion 343 which is bent and U-shaped is formed by folding back the middle portion of the arc tab body, the connecting portion 343 divides the arc tab body into a first plate 341 and a second plate 342 whose faces are opposite to each other, wherein the first plate 341 and the second plate 342 are substantially parallel to each other, a gap is left between the first plate 341 and the second plate 342, the end of the first plate 341 is connected to the arc tab 348, the arc tab 348 is engaged with one side of the arc extinguishing chamber 31, in the figure, the width of the arc tab 348 is greater than that of the arc tab body, both sides of the arc tab 348 protrude from both sides of the first plate 341, the length of the second plate 342 is shorter in the figure, the end of the second plate corresponds to the middle portion of the first plate 346, the first fixing portion 342 protrudes outward from a single side of the end of the second plate to form a plate-shaped structure, the second fixing portion 345 protrudes outward from a single side of the second plate, the second plate 341, the second fixing portion 345 is also can be matched with the protruding edge 346, the protruding edge 345, the other single side of the second plate structure, the protruding wing tab structure 345 can be maintained, and the protruding edge 345, the protruding structure can be maintained flush with the protruding edge 345, and the protruding structure of the second plate 345, and the second fixing portion 345, the protruding structure can be maintained.

In addition, a connection hole 347 is further provided at the end of the second plate 342, wherein the connection hole 347 is located at a plate surface away from the first fixing portion 345, and the connection hole 347 is used for cooperating with the adjustment screw 42 of the overload protection mechanism. In this embodiment, the overload protecting mechanism is disposed along the gap between the first arc striking plate 34a and the side wall of the housing 1, the overload protecting mechanism includes the bimetal 41 and the adjusting screw 42 for adjusting the bimetal 41, a screw hole for passing the adjusting screw 42 is disposed on the side wall of the housing 1, the connecting hole 347 disposed on the second plate 342 is opposite to the screw hole, so that the adjusting screw 42 passes through the screw hole and is assembled in the connecting hole 347, thereby achieving accurate positioning of the assembly.

Preferably, as shown in fig. 1 and 3, a slot is provided in the housing 1 corresponding to the screw hole, and a conductive plate connected between the terminal and the bimetal 41 is assembled in the slot, wherein a groove serving as the third limiting portion 113 is provided on a side wall of the slot facing the first arc tab 34a, and the first fixing portion 345 is fixed to the third limiting portion 113 in a fitting manner; a fourth limiting portion 114 for being inserted into the second fixing portion 346 is disposed in the middle of the housing 1, in the drawing, a separating portion is formed in the middle of the housing 1, the separating portion is disposed along the edges of the arc-isolating wall 32 and the arc-extinguishing chamber 31, two second limiting portions 112 are disposed on one side of the separating portion close to the overload protection mechanism, in the drawing, the two second limiting portions 112 are in a groove structure, a groove serving as the fourth limiting portion 114 is disposed between the two second limiting portions 112, wherein the second limiting portion 112 is used for being inserted into and matched with the first positioning portion 325 of the arc-isolating wall 32, and the second fixing portion 346 is inserted into the fourth limiting portion 114, so that the arc-isolating wall 32 and the first arc-striking plate 34a can be stably assembled in the housing 1.

A second structure of the first arc striking plate 34a in this embodiment is provided with reference to fig. 2 and 8, and similar to the above structure, the first arc striking plate 34a includes a plate-shaped arc striking plate body, wherein a middle portion of the arc striking plate body is bent to form a U-shaped connecting portion 343, so that the arc striking plate body is divided into a first plate 341 and a second plate 342 having different lengths and opposite plate surfaces, and as with the above structure, an arc striking plate 348 is connected to a terminal of the first plate 341, the arc striking plate 348 is matched with one side of the arc extinguishing chamber 31, in the figure, the width of the arc striking plate 348 is greater than that of the arc striking plate body, two sides of the arc striking plate 348 protrude from two sides of the first plate 341, a first fixing portion 345 protrudes outward from a single-side edge of the terminal of the second plate 342 to form a plate-shaped structure, an edge of the first fixing portion 345 is flush with an edge of one side of the arc striking plate 348, and a connecting hole 347 for matching with the adjusting screw 42 is provided at the terminal of the second plate 342.

Different from the above-mentioned arc striking plate structure, the first plate 341 and the second plate 342 are attached to the plate surface close to the connecting portion 343, the side of the second plate 342 close to the connecting portion 343 is provided with a second fixing portion 346, the second fixing portion 346 is formed by outwardly protruding the side edges of the second plate 342 close to the connecting portion 343 to form a wing plate structure, the two side edges of the second fixing portion 346 are respectively flush with the two side edges of the arc striking plate 348, one end of the second plate 342 far from the connecting portion 343 is bent in the direction far from the first plate 341 so that the first fixing portion 345 arranged at the end of the second plate 342 is far from the first plate 341, the inside of the housing 1 is provided with a third limiting portion 113 and a fourth limiting portion 114 which are matched with the first fixing portion 345 and the second fixing portion 346, the positions of the third limiting portion 113 and the fourth limiting portion 114 can be slightly adjusted, and the structure is preferably a groove structure.

The first tab 34a is not limited to the two structures, and the first and second fixing portions 345 and 346 are preferably plate-shaped, but may have other structures.

It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship that is usually placed when used, and are only for convenience of description, but do not indicate that the device or element that is referred to must have a specific orientation, and thus, 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 (14)

1. The utility model provides an arc extinguishing mechanism, includes explosion chamber (31) and sets up exhaust hole (35) on shell (1), its characterized in that: the buffer chambers are arranged side by side and are communicated with each other, the buffer chambers are positioned between the exhaust end of the arc extinguish chamber (31) and the exhaust hole (35), and two ends of each buffer chamber are respectively connected with the exhaust end and the exhaust hole (35);

the direction from the exhaust end of explosion chamber (31) to exhaust hole (35) is first direction, the surge chamber is equipped with the baffle, the baffle is the metal particle that the contained angle setting was arranged in blockking the electric arc gas with first direction, and at least partial baffle is located the surge chamber, and the arch setting is on the lateral wall of surge chamber, and extends in to the surge chamber.

2. The arc extinguishing mechanism of claim 1, wherein: leave first intercommunication space between the exhaust end of a plurality of surge chambers and explosion chamber (31), leave second intercommunication space between a plurality of surge chambers and exhaust hole (35), first intercommunication space is with a plurality of the surge chamber all communicates, and second intercommunication space is with a plurality of the surge chamber all communicates.

3. The arc extinguishing mechanism of claim 2, wherein:

a pair of separation ribs are arranged on the inner side wall of the shell (1) between the exhaust hole (35) and the exhaust end of the arc extinguish chamber (31) in a protruding mode, the space in the shell (1) is divided into a first buffer chamber (331), a second buffer chamber (332) and a third buffer chamber (333) which are parallel through the pair of separation ribs, one end portion, close to the arc extinguish chamber (31), of each separation rib is bent oppositely to form a first baffle (334), a gap between the two first baffles (334) is an inlet of the second buffer chamber (332), a first communicating space is reserved between the first baffle (334) and the exhaust end of the arc extinguish chamber (31), and inlets of the first buffer chamber (331), the second buffer chamber (332) and the third buffer chamber (333) are communicated through the first communicating space;

one end part of each of the pair of partition ribs, which is close to the exhaust hole (35), is bent to form a second baffle plate (335), a gap between the two second baffle plates (335) is an outlet of the second buffer chamber (332), a second communication space is reserved between the outlet of the second buffer chamber (332) and the exhaust hole (35), and outlets of the first buffer chamber (331), the second buffer chamber (332) and the third buffer chamber (333) are communicated through the second communication space.

4. An arc extinguishing mechanism according to claim 3, characterized in that: a pair of blocking parts are arranged in the second communication space, the blocking parts correspond to the space between the outlet of the second buffer chamber (332) and the exhaust hole (35), and third baffles (336) matched with the second baffles (335) are respectively arranged on the side walls of the first buffer chamber (331) and the third buffer chamber (333).

5. An arc extinguishing mechanism according to claim 3, characterized in that: the space of the second buffer chamber (332) is larger than the spaces of the first buffer chamber (331) and the third buffer chamber (333), and the inner diameter of the inlet of the second buffer chamber (332) is smaller than the inner diameters of the inlets of the first buffer chamber (331) and the third buffer chamber (333).

6. The arc extinguishing mechanism of claim 1, wherein: still include flash barrier (32), flash barrier (32) set up between the arc end of advancing of explosion chamber (31) and contact mechanism, are equipped with a plurality of flash barriers (321) in the surface protrusion of flash barrier (32), and the interval between two adjacent flash barriers (321) forms water conservancy diversion passageway (322), and moving contact (21) range upon range of setting up in the top of a plurality of flash barriers (321) of contact mechanism at least.

7. The arc extinguishing mechanism of claim 6, wherein: the middle part of separating arc muscle (321) is buckled, makes water conservancy diversion passageway (322) that two adjacent separating arc muscle (321) cooperations formed include first water conservancy diversion section (323) and second water conservancy diversion section (324), first water conservancy diversion section (323) communicates and forms the contained angle with the one end of second water conservancy diversion section (324), and the one end of first water conservancy diversion section (323) extends the avris of flash barrier wall (32), and the other end of second water conservancy diversion section (324) is just right with the arc end of advancing of explosion chamber (31).

8. An arc extinguishing mechanism according to claim 6 or 7, characterized in that: the arc isolation ribs (321) are arranged on the surfaces of the front side and the back side of the arc isolation wall (32) in a protruding mode, a first limiting groove (11) is arranged on the inner side wall of the shell (1) between the contact mechanism and the arc extinguishing chamber (31), and the arc isolation ribs (321) and the first limiting groove (11) are matched to limit the arc isolation wall (32).

9. An arc extinguishing mechanism according to claim 8, characterized in that: a pair of limiting convex ribs (111) are arranged on the inner side wall of the shell (1) between the contact mechanism and the arc extinguish chamber (31) in a protruding mode, a gap between the pair of limiting convex ribs (111) is a first limiting groove (11), one of the limiting convex ribs is matched with the first limiting groove (11) in an arc isolating rib (321), and the adjacent arc isolating rib (321) is matched with the limiting convex rib (111) in a staggered mode.

10. The arc extinguishing mechanism of claim 7, wherein: the side of the arc-isolating wall (32) is provided with a first positioning part (325), and the inner side wall of the shell (1) of the circuit breaker is provided with a second limiting part (112) which is in limiting fit with the first positioning part (325).

11. An arc extinguishing mechanism according to claim 6 or 7, characterized in that: and one side of the arc isolating wall (32) back to the contact mechanism is provided with arc isolating plates in a laminating way.

12. The arc extinguishing mechanism of claim 1, wherein: the arc extinguishing chamber is characterized by further comprising a pair of arc striking sheets, wherein the pair of arc striking sheets are arranged along two sides of the arc extinguishing chamber (31) respectively and are matched and fixed with the inner side wall of the shell (1).

13. The arc extinguishing mechanism of claim 1, wherein: arc-extinguishing chamber (31) are including support (311) and a plurality of arc extinguishing bars piece (312), and a plurality of arc extinguishing bars piece (312) are range upon range of and are set up on support (311), and the one end that support (311) were kept away from in arc extinguishing bars piece (312) is equipped with breach (313) as the end of arc-extinguishing chamber (31), and the one end that breach (313) were kept away from in support (311) is equipped with the venthole as the exhaust end of arc-extinguishing chamber (31).

14. A plug-in circuit breaker, includes shell (1) and sets up the contact mechanism in shell (1), its characterized in that: an arc extinguishing mechanism according to any one of claims 1-13 is fitted at one end of the contact mechanism.

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