CN219105962U - Arc extinguishing system and circuit breaker - Google Patents

Abstract

An arc extinguishing system and a circuit breaker, wherein the arc extinguishing system comprises an arc extinguishing chamber, a pair of arc-isolating plates are arranged on one side of the arc extinguishing chamber, an arc striking cavity communicated with the arc extinguishing chamber is formed between the pair of arc-isolating plates, a contact mechanism is arranged in the arc striking cavity and comprises a fixed contact and a movable contact, the arc extinguishing system further comprises an iron core arranged in the arc striking cavity, at least a part of a conductive plate of the fixed contact surrounds the outer side of the iron core, and a magnetic conduction assembly is arranged on one side of each arc-isolating plate opposite to the arc striking cavity. The conductive plate of the static contact of the utility model surrounds the outer side of the iron core, so that a magnetic field can be generated near the static contact after being electrified, when the contact mechanism is switched off, an arc generated by the breaking of the contact mechanism is quickly blown into the arc extinguishing chamber under the action of the magnetic field, the stay time of the arc at the static contact is shortened, and the arc extinguishing effect of the arc extinguishing system is optimized.

Description

Arc extinguishing system and circuit breaker

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to an arc extinguishing system and a circuit breaker.

Background

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

In the existing products, an arc extinguishing mechanism for extinguishing an arc is usually arranged on one side of a contact mechanism, but the arc cannot enter an arc extinguishing chamber of an arc extinguishing system quickly due to insufficient magnetic blowing force, and the safety and reliability of a circuit breaker can be seriously affected by the arc extinguishing system with poor arc extinguishing effect.

Disclosure of Invention

The utility model aims to overcome at least one defect of the prior art and provide an arc extinguishing system and a circuit breaker with high arc extinguishing efficiency.

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

the utility model provides an arc extinguishing system, includes the explosion chamber, is equipped with a pair of flash barrier in one side of explosion chamber, forms the striking chamber with explosion chamber intercommunication between a pair of flash barrier set up contact mechanism in the striking chamber, contact mechanism includes stationary contact and moving contact, and the explosion system is still including setting up in the iron core in striking intracavity, and the current-conducting plate of stationary contact is at least partly around in the iron core outside, and one side that every flash barrier was facing away from the striking chamber is equipped with magnetic conduction subassembly.

Further, still include the first striking board of being connected with the static contact, the one end butt joint of first striking board and current conducting plate, the middle part of first striking board is crooked and forms the structure in the iron core outside with the current conducting plate cooperation formation of static contact, and the other end of first striking board extends to the explosion chamber.

Further, the arc-shield plate and the magnetic conduction assembly are provided with assembly holes, the central axis of the iron core is perpendicular to the arc-shield plate, and two ends of the iron core are correspondingly inserted into the assembly holes.

Further, one side of the arc-stop plate, which is opposite to the arc striking cavity, is provided with a mounting groove, and the magnetic conduction assembly is assembled in the mounting groove in a limiting way.

Further, the magnetic conduction assembly comprises a magnetic conduction plate and a first magnetic yoke, wherein the magnetic conduction plate and the first magnetic yoke are arranged side by side and are respectively attached to the arc-isolating plate, the magnetic conduction plate corresponds to an area, close to the moving contact, of the arc striking cavity, and the first magnetic yoke corresponds to the middle part of the arc striking cavity.

Further, the arc-shield plate is provided with a first assembly hole, one side of the first magnetic yoke, which is close to the fixed contact, is provided with a second assembly hole corresponding to the first assembly hole, and the iron core is sequentially inserted into the first assembly hole and the second assembly hole.

Further, the first magnetic yoke comprises a first plate and a second plate, a through hole serving as a second assembly hole is formed in the middle of the first plate, one side edge of the first plate is connected with one end side wall of the second plate, an included angle is formed between the first plate and the plate surface of the second plate, the other end of the second plate is bent to form a bending part, and the bending part and the first plate are located on the same side of the second plate.

Further, the static contact is located the one side that the striking chamber is close to the explosion chamber, and the moving contact swings in the striking intracavity in order to be close to or keep away from the static contact, the static contact includes the current-conducting plate, the one end of current-conducting plate extends to the direction that deviates from the moving contact along the direction that is on a parallel with the explosion chamber, and the middle part of current-conducting plate is crooked and around setting up in the one side that the iron core was dorsad to the explosion chamber, and the other end of current-conducting plate extends to the striking intracavity along the tangential of iron core and is equipped with moving contact complex contact.

The utility model also provides a circuit breaker, which comprises a shell, wherein a pair of wiring terminals are arranged at two ends of the shell, and the arc extinguishing system is arranged between the pair of wiring terminals.

Preferably, the shell further comprises an operating mechanism and a contact mechanism, the contact mechanism comprises a moving contact and a fixed contact which are oppositely arranged, the moving contact is connected with one wiring terminal, and the fixed contact is positioned between the operating mechanism and the arc extinguishing chamber and is connected with the other wiring terminal; the short-circuit protection mechanism is arranged on one side of the fixed contact, which is opposite to the arc extinguish chamber, the overload protection mechanism is arranged on one side of the arc extinguish chamber, which is opposite to the moving contact, one end of the overload protection mechanism is connected with the fixed contact at the same wiring terminal, and the other end of the overload protection mechanism extends to one side of the operating mechanism and is used for triggering the operating mechanism to trip.

According to the arc extinguishing system and the circuit breaker using the same, the conductive plates of the fixed contact encircle the outer side of the iron core, so that a magnetic field can be generated near the electrified fixed contact, when the contact mechanism is switched off, an arc generated by breaking of the contact mechanism is quickly blown into the arc extinguishing chamber under the action of the magnetic field, the stay time of the arc at the fixed contact is shortened, and the arc extinguishing effect of the arc extinguishing system is optimized.

In addition, the arc striking plate is matched with the conducting plate of the static contact to form a structure encircling the outer side of the iron core, so that the internal structure is more compact.

In addition, the central axis of iron core is perpendicular to the arc-stop plate, and the iron core is pegged graft with arc-stop plate, magnetic conduction subassembly, both can make the magnetic field direction that forms near the static contact parallel with the central axis of iron core, do benefit to and make the electric arc obtain great magnetic blowing force, promote the electric arc to be blown into the explosion chamber fast, also possess convenient assembling's advantage.

Drawings

Fig. 1 is a schematic view of a circuit breaker (without a second positioning plate) according to the present utility model;

FIG. 2 is an enlarged schematic view of the portion C in FIG. 1;

fig. 3 is a schematic structural view of the circuit breaker (a side provided with the second positioning plate) according to the present utility model;

fig. 4 is a schematic structural view of the circuit breaker (a side provided with the first positioning plate) according to the present utility model;

FIG. 5 is a schematic view of the handle mechanism, operating mechanism and moving contact according to the present utility model;

FIG. 6 is a schematic view of the reset member and latch of the present utility model;

fig. 7 is a schematic diagram of an arc extinguishing system of the present utility model inducing a magnetic field;

fig. 8 is a top view of the arc extinguishing system of the present utility model when the arc extinguishing system is opened;

fig. 9 is a top view of the arc extinguishing system of the present utility model during closing;

fig. 10 is an exploded schematic view of the arc extinguishing system of the present utility model (without the arc chute);

FIG. 11 is a schematic view of the structure of the unlocking member in the present utility model;

FIG. 12 is a schematic diagram of the engagement of the short circuit protection mechanism and the unlocking member of the present utility model;

fig. 13 is a schematic structural view of the first yoke in the present utility model.

Detailed Description

Embodiments of the arc extinguishing system and circuit breaker of the present utility model are further described below with reference to the examples given in the accompanying drawings. The arc extinguishing system of the present utility model is not limited to the description of the following embodiments.

As shown in fig. 1, 3 and 4, the circuit breaker comprises a shell, two ends of the shell are provided with a pair of wiring terminals, a handle mechanism 2, an operating mechanism, a contact mechanism and an arc extinguishing system are arranged between the pair of wiring terminals, wherein the handle mechanism 2 is rotatably assembled on the shell, the contact mechanism comprises a moving contact 61 and a fixed contact 62 which are mutually matched, the moving contact 61 and the fixed contact 62 are respectively and electrically connected with the pair of wiring terminals, the fixed contact 62 is fixedly assembled in the shell, the handle mechanism 2, the operating mechanism and the moving contact 61 are sequentially connected in a linkage manner, and the moving contact 61 can be driven to rotate towards a direction approaching to or away from the fixed contact 62 through operating the handle mechanism 2, so that the switching-on and switching-off of the circuit breaker are realized; the arc extinguishing system is matched with the contact mechanism and is used for extinguishing an electric arc generated when the contact mechanism breaks. In addition, a protection mechanism can be arranged in the shell, the protection mechanism is matched with the operation mechanism, when the circuit breaker has short circuit or overload fault, the protection mechanism triggers the operation mechanism to trip, so that the operation mechanism drives the movable contact 61 to be far away from the fixed contact 62, and the protection mechanism comprises a short circuit protection mechanism and/or overload protection mechanism 9 and is used for triggering the operation mechanism to trip when the short circuit or overload fault occurs.

The improvement point of the application lies in the arc extinguishing system matched with a contact mechanism, the arc extinguishing system comprises an arc extinguishing chamber 71 and a pair of arc-isolating plates 72 arranged on one side of the arc extinguishing chamber 71, a pair of arc-isolating plates 72 are oppositely arranged at intervals to form an arc striking cavity communicated with the arc extinguishing chamber 71, the contact mechanism is correspondingly arranged in the arc striking cavity, a fixed contact 62 is positioned on one side of the arc striking cavity close to the arc extinguishing chamber 71, a movable contact 61 swings in the arc striking cavity, an iron core 73 is arranged in the arc striking cavity, at least a part of a conductive plate 621 of the fixed contact 62 surrounds the outer side of the iron core 73, a magnetic conduction assembly is arranged on one side of each arc-isolating plate 72 opposite to the arc striking cavity, a magnetic field for blowing is generated in the arc striking cavity by the cooperation of the magnetic conduction assembly and the iron core 73, a magnetic field is generated near the fixed contact 62 after the contact mechanism is electrified, the magnetic field is generated in the arc striking cavity through the magnetic conduction assembly, when the contact mechanism is separated from the brake, the breaking time of the arc is shortened, which is generated by the contact mechanism in the arc extinguishing chamber 71, and the breaking time of the arc is stopped at the position of the fixed contact 62, and the arc extinguishing system is optimized.

Preferably, the arc extinguishing system further comprises a first arc striking plate 751 and a second arc striking plate 752 which are oppositely arranged at intervals, wherein the first arc striking plate 751 is arranged along one side of the arc striking cavity, which is close to the fixed contact 62, one end of the first arc striking plate 751 is connected with the end of the conductive plate 621 of the fixed contact 62, the first arc striking plate 751 and the conductive plate 621 are matched to form a structure surrounding the outer side of the iron core 73, the first arc striking plate 751 and the conductive plate 621 of the fixed contact 62 are matched to form a structure surrounding the outer side of the iron core 73, the magnetic field is generated by the iron core 73 in a conductive state, and the internal structure is more compact.

In addition, the connection structure of the first arc striking plate 751 and the conductive plate 621 is the same as that of the prior art, and the arc extinguishing system can be conveniently modified by additionally arranging the iron core 73 in the annular area formed by the cooperation of the prior static contact 62 and the first arc striking plate 751. Of course, the conductive plate 621 of the stationary contact 62 completely surrounds the outer periphery of the iron core 73 and is connected to the first arc striking plate 751, that is, the conductive plate 621 is connected to the first arc striking plate 751 after being wound around the iron core 73 at least once, but the usage amount and space occupation rate of the conductive plate 621 are increased.

The circuit breaker includes a housing, preferably including a base 11 and an upper cover 12 that are mutually covered, a pair of terminals are provided at two ends of the housing, an operating mechanism, a handle mechanism 2, an arc extinguishing system, a short-circuit protection mechanism and an overload protection mechanism 9 are provided in the housing between the pair of terminals, the handle mechanism 2 is rotatably assembled at the upper portion of the housing, a handle hole for the handle mechanism 2 to extend out is provided at the upper side wall of the housing, the operating mechanism is connected with the handle mechanism 2 in a linkage manner and is located at the middle of the housing, the arc extinguishing system is correspondingly arranged at the lower portion of the housing and is located below the handle mechanism 2, the short-circuit protection mechanism is located between the operating mechanism and the arc extinguishing system, a protection mechanism is provided in a gap between one of the terminals and the operating mechanism, the short-circuit protection mechanism and the overload protection mechanism 9 are respectively matched with the operating mechanism, and the short-circuit protection mechanism and the overload protection mechanism 9 are close to and connected with the same terminal.

As shown in fig. 1, 2 and 5, the operating mechanism includes a pair of oppositely disposed positioning plates, namely a first positioning plate 13 and a second positioning plate 14, the first positioning plate 13 and the second positioning plate 14 are disposed in parallel between the base 11 and the upper cover 12, a connecting rod assembly and a hasp assembly are assembled between the first positioning plate 13 and the second positioning plate 14, the handle mechanism 2 can be rotatably supported between the first positioning plate 13 and the second positioning plate 14, the handle mechanism 2 is in linkage connection with the moving contact 61 through the connecting rod assembly, the hasp assembly is located at one side of the handle mechanism 2 and can drive the handle mechanism 2 to rotate in the opening direction, the short-circuit protection mechanism and the overload protection mechanism 9 are located at positions close to the hasp assembly in the shell, and the connecting rod assembly and the hasp assembly are in sliding fit through driving the hasp assembly to move from the closing position to the opening position and drive the moving contact 61 and the handle mechanism 2 to rotate in the opening direction.

As shown in fig. 5, 6 and 11, the link assembly is located on the side of the hasp assembly facing away from the short-circuit protection mechanism, that is, the link assembly is located between the upper side wall of the shell and the hasp assembly, the link assembly comprises a first link 31, a second link 32, a third link 33 and a reset piece 34, wherein one end of the first link 31 is linked with the handle mechanism 2, one end of the second link 32 connected with the first link 31 reciprocates along a connecting line connected between the handle mechanism 2 and the moving contact 61, preferably, the moving track of the reciprocation is approximately parallel to the side wall of the shell provided with the handle hole, the other end of the second link 32 is linked with one end of the third link 33, the other end of the third link 33 is linked with the moving contact 61, the reset piece 34 is used for providing a reset force for the third link 33 to enable the link assembly to move in sliding fit with the hasp assembly from the closing position to the opening position, preferably, the reset piece 34 is a spring, one end of the spring is connected with the positioning plate, and the other end of the spring is connected with the third link 33.

The hasp assembly comprises an unlocking member 41, a locking member 42 and a hasp resetting member 43, wherein the unlocking member 41 is rotatably assembled between the first positioning plate 13 and the second positioning plate 14, the locking member 42 is assembled between the first positioning plate 13 and the second positioning plate 14, the unlocking member 41 is positioned between the locking member 42 and the handle mechanism 2, in fig. 1-5, the locking member 42 is positioned in a shell between the handle mechanism 2 and the moving contact 61 and is parallel to a shell side wall provided with a handle hole, in the embodiment, the locking member 42 is parallel to an upper side wall (see fig. 1-4) of the shell, a sliding groove 421 is arranged in the middle of the locking member 42, the sliding groove 421 is basically parallel to the shell side wall provided with the handle hole, an arc-shaped avoidance groove 421a is formed by bending downwards at one end of the sliding groove 421 away from the handle mechanism 2 in a direction close to the moving contact 61, a joint of the first connecting rod 31 and the second connecting rod 32 slides through the sliding groove 421, a short shaft connected between the first connecting rod 31 and the second connecting rod 32 slides through the sliding groove 421 is generally matched with the short shaft 421, a sliding track of one end of the sliding groove 421 is limited by the sliding groove 421, when the sliding track of one end of the second connecting rod 32 is positioned at the first connecting rod 31 and the arc-shaped connection groove 421 is positioned at the position of the arc-shaped connection groove 421 is far away from the first connecting rod 32, and the arc-shaped connection groove 421 is positioned at the first connecting rod 32 is far away from the arc-shaped connection groove 421 is; one end of the locking member 42 is rotatably connected with the positioning plate, the other end of the locking member 42 is in snap fit with one end of the unlocking member 41, which is close to the locking member 42, in this embodiment, the short-circuit protection mechanism and the overload protection mechanism 9 are respectively matched with the unlocking member 41, when a short circuit or overload fault occurs, the unlocking member 41 rotates, the reset member 34 drives the connecting rod assembly to be in sliding fit with the snap-fit assembly, and the connecting rod assembly is moved to the opening position from the closing position, that is, the locking member 42 rotates by a certain angle, the connection part of the first connecting rod 31 and the second connecting rod 32 is moved out of the arc-shaped avoiding groove 421a, the connection part of the first connecting rod 31 and the second connecting rod 32 can drive the locking member 42 to rotate, so that the locking member 42 rotates back to the original position, or the connecting rod assembly drives the unlocking member 41 to rotate back to the original position, so that the unlocking member 41 and the locking member 42 are restored to be in snap fit, and the connecting rod assembly is driven by the reset member 34 to slide leftwards along the sliding chute 421, and the connecting rod assembly drives the contact handle 2 and the moving handle 61 to the opening direction to the opening position until the connecting rod assembly moves leftmost end of the sliding chute 421 to the sliding along the sliding chute 421, and the sliding chute 421 is preferably in the position, and the position of the unlocking member is in the reset member 43 is provided for the reset force, and the unlocking member is preferably connected between the unlocking member 43 and the unlocking member 43.

The operating mechanism further comprises an energy storage connecting rod 35, the energy storage connecting rod 35 is positioned on one side of the first positioning plate 13 opposite to the second positioning plate 14, the energy storage connecting rod 35 and the connecting rod assembly are separated by the first positioning plate 13, one end of the energy storage connecting rod 35 is connected with the handle mechanism 2 in a linkage manner, the other end of the energy storage connecting rod 35 extends to one side of the moving contact 61, the moving contact 61 is provided with a limiting part 611 which can be abutted with the energy storage connecting rod 35, and in the closing process, the energy storage connecting rod 35 and the limiting part 611 are matched to realize quick closing; in this embodiment, a first track groove 151 is provided at a position of the first positioning plate 13 corresponding to the handle mechanism 2, the first track groove 151 is an arc groove in fig. 4, a first end of the energy storage link 35 slides through the first track groove 151 and is connected with the handle mechanism 2, so that the first end of the energy storage link 35 slides along the first track groove 151 along with rotation of the handle mechanism 2, a return spring is connected between the first end of the energy storage link 35 and the handle mechanism, a second end of the energy storage link 35 moves between the moving contact 61 and the fixed contact 62, and a movement track of the second end of the energy storage link 35 intersects with a movement track of the limiting portion 611 at a point. In this embodiment, the limiting portion 611 is located on a boss structure on a side of the moving contact 61 facing the fixed contact 62.

Of course, the track groove may further include a second track groove, where the middle portion of the second track groove intersects with the moving track of the limiting portion 611 only at a point, the second end of the energy storage link 35 moves along the second track groove to be matched with the limiting portion 611, and the second track groove may be disposed on the first positioning plate 13 or may be disposed on the second positioning plate 14, which only needs to ensure that the second track groove corresponds to between the moving contact 61 and the fixed contact 62, and only has one intersection point with the moving track of the limiting portion 611 in the extending direction of the second track groove, so that the second end of the energy storage link 35 moves along the second track groove.

In addition, when the positioning plate is not used to separate the link assembly and the energy storage link 35, that is, when the energy storage link 35 and the link assembly are assembled together with the first positioning plate 13 and the second positioning plate 14, if the energy storage link 35 can be ensured to move on a determined track, the track groove may be omitted.

As shown in fig. 5, the operating mechanism further includes an indicator 5, where the indicator 5 is rotatably assembled on a side of the first positioning plate 13 opposite to the second positioning plate 14, an indication window is disposed on a side wall of the housing provided with a handle hole, one end of the indicator 5 is corresponding to the indication window as an indication portion, a driven portion is protruded on a side of the indicator 5 facing the link assembly, and a groove is formed on the first positioning plate 13 corresponding to the driven portion, so that the driven portion can be driven by the link assembly, in this embodiment, a hollow area is formed on a side of the second positioning plate 14, and the driven portion is matched with the second link 32, that is, a driving portion is disposed on a side of the second link 32, and preferably the driving portion includes a closing driving portion and an opening driving portion, and the opening driving portion is respectively matched with the driving portion to push the indicator 5 to swing to switch states, so as to indicate the opening and closing states of the circuit breaker.

As shown in fig. 1-5, the contact mechanism comprises a fixed contact 62 and a movable contact 61 which are oppositely arranged, the fixed contact 62 comprises a conductive plate 621, the conductive plate 621 is arranged along the middle part of the shell, one end of the conductive plate 621 is connected with one wiring terminal, the middle part of the conductive plate 621 is parallel to the side wall of the shell provided with a handle hole, in fig. 1-4, the middle part of the conductive plate 621 is positioned below the locking piece 42, the other end of the conductive plate 621 is bent and provided with a contact on the surface of the conductive plate 621, and the contact is opposite to the movable contact 61 and is used for being matched with the contact of the movable contact 61; the movable contact 61 is provided with an energy storage element 612, the energy storage element 612 provides closing driving for the movable contact 61, and the energy storage element 612 is preferably arranged between the movable contact 61 and the third connecting rod 33; the moving contact 61 includes a moving contact body, a contact for matching with the fixed contact 62 is disposed on one side of the end of the moving contact body, a limiting portion 611 is protruding on one side of the moving contact body facing the fixed contact 62, the limiting portion 611 is matched with the second end of the energy storage connecting rod 35, the limiting portion 611 and the contact of the moving contact 61 are located on the same side of the moving contact body, of course, the limiting portion 611 may be disposed at other positions of the moving contact body, for example, the side wall of the moving contact body adjacent to the contact position, in addition, the limiting portion 611 may be a groove structure, but it is required to ensure that the second end of the energy storage connecting rod 35 can smoothly extend into or move out of the groove.

During closing, the handle mechanism 2 drives the connecting rod assembly to rotate towards the closing direction, the connecting part of the first connecting rod 31 and the second connecting rod 32 moves to and fro along the sliding groove 421, that is, the left end of the sliding groove 421 moves to the right end of the sliding groove 421 in fig. 1, 2 and 5, the third connecting rod 33 drives the moving contact 61 to rotate towards the direction close to the fixed contact 62, the second end of the energy storage connecting rod 35 moves downwards to be between the moving contact 61 and the fixed contact 62, the second end of the energy storage connecting rod 35 is abutted with the limiting part 611, the moving contact 61 stops rotating, the connecting rod assembly is driven to store energy along with the continuous rotation of the handle mechanism 2 in the closing direction, meanwhile, the continuous rotation of the handle mechanism 2 enables the second end of the energy storage connecting rod 35 to continuously move downwards so as to release limiting cooperation with the limiting part 611, after the second end of the second connecting rod 32 is separated from the limiting part 611, the energy storage member 612 releases energy to drive the moving contact 61 to continuously rotate, and the energy storage member 612 releases energy to accelerate the closing rotation of the moving contact 61, so that rapid closing is realized, and the closing is achieved, and the closing is carried out in place by referring to fig. 1, 2, 4 and 5, and the connecting rod 31 is kept in place in the arc-shaped state and 31. During the closing process, the closing driving part of the second connecting rod 32 pushes the indicator 5 to rotate towards the closing direction, so that the indicator 5 switches the indication state.

During opening, the handle mechanism 2 drives the connecting rod assembly to rotate towards the opening direction, the connection part of the first connecting rod 31 and the second connecting rod 32 moves back and forth along the sliding groove 421, namely, the right end of the sliding groove 421 moves to the left end of the sliding groove 421 in fig. 1, 2 and 5, the third connecting rod 33 drives the moving contact 61 to rotate towards the direction away from the fixed contact 62, the second end of the energy storage connecting rod 35 moves upwards, and when the energy storage connecting rod 35 and the limiting part 611 just start to contact, the moving track of the energy storage connecting rod 35 is finely adjusted by the reset spring, so that the energy storage connecting rod 35 and the limiting part 611 cannot abut against and limit, and the opening is in place, as shown in fig. 4. During the opening process, the opening driving part of the second connecting rod 32 pushes the indicator 5 to rotate towards the opening direction, so that the indicator 5 switches the indication state.

As shown in fig. 1, 3 and 4, in this embodiment, the short-circuit protection mechanism and the overload protection structure are respectively matched with the snap-fit assembly, in the figure, the short-circuit protection mechanism is located below the snap-fit assembly, the short-circuit protection mechanism comprises a second magnetic yoke 82 and an armature 81, the armature 81 is located between the second magnetic yoke 82 and the snap-fit assembly, the second magnetic yoke 82 is connected with the fixed contact 62, one end of the armature 81 is rotationally connected, the other end of the armature 81 can rotate towards the direction close to the second magnetic yoke 82 under the action of the second magnetic yoke 82, a deflector 811 for triggering the rotation of the unlocking member 41 is arranged on one side facing the snap-fit assembly, in this embodiment, the deflector 811 is arranged at an angle with the armature 81, so that one end of the deflector 811 is inclined towards the unlocking member 41, and the rotation of the unlocking member 41 is more favorably triggered to be unlocked when the short-circuit fault occurs; in fig. 3, the second magnetic yoke 82 is connected to the conductive plate 621 of the stationary contact 62, and the second magnetic yoke 82 and the armature 81 are respectively located at two sides of the conductive plate 621, it is also understood that the conductive plate 621 is connected to the second magnetic yoke 82 and passes through a gap between the second magnetic yoke 82 and the armature 81, so that the conductive plate 621 of the stationary contact 62 becomes a part of the short-circuit protection mechanism, to simplify the structure thereof, wherein the armature 81 rotates between the conductive plate 621 and the buckle assembly, the second magnetic yoke 82 is located at a side of the conductive plate 621 opposite to the buckle assembly, a deflector 811 is disposed at a side of the armature 81 opposite to the stationary contact 62, the deflector 811 can drive the unlocking member 41 to rotate, so that the unlocking member 41 is disengaged from the locking member 42, and the locking member 42 is in a rotatable state, so that the link assembly is driven to reset by the resetting member 34, that is moved toward the opening direction, so that the moving contact 61 and the handle mechanism 2 are driven by the link assembly to open.

In connection with fig. 3 and 12, a specific embodiment of a short-circuit protection mechanism is provided, the short-circuit protection mechanism includes an armature 81, a second magnetic yoke 82, a rotating connecting shaft and an armature reset member, wherein the armature 81 has a plate structure, two opposite side edges of the armature 81 are bent and extended to form side edges, an assembly hole is arranged at the same end of a pair of side edges, the rotating connecting shaft is assembled in the assembly hole, a transient spring is sleeved on the rotating connecting shaft, the armature 81 is rotationally assembled in a shell by the rotating connecting shaft, the armature 81 can be driven to reset by adjusting the force value of the spring to set the transient action value, a yielding groove 812 is formed on the plate surface of the armature 81, the yielding groove 812 is used for unlocking and rotating the yielding unlocking piece 41, the edge of the yielding groove 812, which is close to one side of the rotating connecting shaft, is inclined outwards along the direction deviating from the side edge to form a shifting rod 811, a gap is reserved between the shifting rod 811 and the yielding groove 812, so that the first unlocking part 411 of the unlocking piece 41 can correspondingly extend into the gap between the shifting rod 811 and the yielding groove 812, the armature resetting piece is sleeved on the rotating connecting shaft, preferably, the armature resetting piece is a torsion spring, one elastic arm of the armature resetting piece extends into the yielding groove 812 and is abutted with the edge of the yielding groove 812, and the other elastic arm of the armature resetting piece is abutted with the armature 81, so that the armature 81 can be extruded for energy storage during rotation; the second magnetic yoke 82 is integrally in a plate structure, and edges on two sides of the second magnetic yoke are bent in the same direction to form a folded edge, in this embodiment, the folded edge is located on one side facing the armature 81, the conductive plate 621 of the fixed contact 62 is attached to the plate surface of the second magnetic yoke 82, and the conductive plate 621 is located between a pair of folded edges, so that the structure is more compact.

One end of the overload protection mechanism 9 and the short-circuit protection mechanism are connected to the same wiring terminal, the other end of the overload protection mechanism 9 extends to one side of the hasp assembly, the overload protection mechanism 9 comprises a bimetallic strip, in fig. 1 and 3, the movable end of the bimetallic strip extends towards the direction of the handle mechanism 2, one end of the unlocking piece 41, which is close to the handle mechanism 2, corresponds to between the handle mechanism 2 and the movable end of the bimetallic strip, and the unlocking piece 41 is rotated to separate and unbuckle the locking piece 42 by driving the unlocking piece 41 to be close to one end of the handle mechanism 2.

In this embodiment, the unlocking member 41 is provided with a first triggering portion 411, a second triggering portion 412 and a buckle portion 413, the first triggering portion 411 and the second triggering portion 412 correspond to opposite sides of the unlocking member 41, in this embodiment, the first triggering portion 411 is located at one end far away from the handle mechanism 2, that is, the first triggering portion 411 is close to the short-circuit protection mechanism and is used for being matched with the short-circuit protection mechanism, in addition, the buckle portion 413 and the first triggering portion 411 are arranged at the same end of the unlocking member 41 side by side, so that the unlocking rotation distance of the unlocking member 41 is shortened, the occupied space is reduced, and the internal structure is more compact; the second trigger portion 412 is adjacent the handle mechanism 2 for engagement with the movable end of the bi-metallic strip.

Referring to fig. 1-6 and 11, to provide a specific structure of the unlocking member 41, as shown in fig. 11, the unlocking member 41 includes a rotation portion 410, a first trigger portion 411, a second trigger portion 412, a buckle portion 413 and a reset connection portion 414 that are integrally formed, the rotation portion 410 is cylindrical, a shaft hole for rotation assembly is provided in the middle of the rotation portion 410, the unlocking member 41 is rotatably assembled between the first positioning plate 13 and the second positioning plate 14 through the rotation portion 410, the second trigger portion 412 and the buckle portion 413 are located at opposite sides of the rotation portion 410, the first trigger portion 411 and the buckle portion 413 are arranged side by side, the first trigger portion 411 protrudes outwards to form a hook shape, a groove structure is provided at a side of the first trigger portion 411 facing the second trigger portion 412, a bottom surface of the groove structure is used as a mating surface 411a for mating with a driving lever 811, preferably, the mating surface 411a is an inclined surface, when the unlocking member 41 is mated with the driving lever 811, the first trigger portion is correspondingly located in a gap between the driving lever 811 and the yielding groove 812, the first trigger portion is prevented from interfering with the unlocking member 41 when the unlocking member 41 is driven; the end of the second triggering portion 412 extends outwards along the direction away from the rotating portion 410, the whole second triggering portion 412 is in a rod-shaped structure, the hasp portion 413 extends along the tangential line parallel to the shaft hole and towards the direction away from the second triggering portion 412, a hasp surface is formed on one side surface of the hasp portion 413 and is used for being in contact with the locking piece 42, the upper surface of the hasp portion 413 is used for being in contact with the locking piece 42 in the figure, the reset connecting portion 414 extends outwards in a protruding mode along the direction parallel to the central axis of the shaft hole, the reset connecting portion 414 is also cylindrical, one end of the latch reset piece 43 is connected with the reset connecting portion 414, and the other end of the latch reset piece 43 is connected with the first positioning portion 131 of the first positioning plate 13.

As shown in fig. 1, 3, 4 and 7-10, the arc extinguishing system is arranged in a matching way with the contact mechanism and is arranged below the shell, the arc extinguishing system comprises an arc extinguishing chamber 71, the arc extinguishing chamber 71 is arranged below the operating mechanism, particularly below the hasp assembly, in fig. 1 and 3, the short circuit protection mechanism and the static contact 62 are positioned between the arc extinguishing chamber 71 and the hasp assembly, the internal space of the shell is fully utilized, and is more compact in structure, the overload protection mechanism 9 is positioned on one side of the arc extinguishing chamber 71 opposite to the moving contact 61, a pair of arc isolation plates 72 are arranged on one side of the arc extinguishing chamber 71, the plate surfaces of the arc isolation plates 72 are parallel to the plate surfaces of the positioning plates, an arc striking cavity communicated with the arc extinguishing chamber 71 is formed between the arc isolation plates 72, the contact mechanism is correspondingly arranged in the arc striking cavity, the static contact 62 is fixed on one side of the arc striking cavity, which is close to the arc extinguishing chamber, particularly, one end of the conductive plate 621 is arranged on one side of the arc striking cavity, which is parallel to the direction of the arc extinguishing chamber 71, and is far away from the moving contact 61, the middle part of the conductive plate 621 is bent and around 73 on one side opposite to the moving contact 71, the side of the moving contact 71, the conductive plate 621 surrounds the moving contact 73, and the other end of the conductive plate 621 surrounds the surrounding the moving contact 73, and surrounds the three contacts and surrounds the moving contact 73, and is arranged on the side of the side, and is connected with the arc striking cavity 73, and extends along the arc striking cavity, along the side; the moving contact 61 may swing in the arc striking cavity to be close to or far away from the fixed contact 62, the iron core 73 is disposed on one side of the arc striking cavity close to the arc extinguishing chamber 71, the middle portion of the conductive plate 621 of the fixed contact 62 is attached to the outer side of the iron core 73 and is bent along the outer curved surface of the iron core 73, so that one end of the conductive plate 621 provided with a contact extends in the tangential direction of the iron core 73 in a direction away from the buckle assembly, and in fig. 1-4, the conductive plate 621 of the fixed contact 62 surrounds one side of the iron core 73 facing the buckle assembly and the moving contact 61.

A first arc striking plate 751 and a second arc striking plate 752 which are respectively matched with the contact mechanism are arranged in the arc striking cavity, wherein the first arc striking plate 751 is matched with the fixed contact 62, one end of the first arc striking plate 751 is connected with the fixed contact 62, namely one end of the first arc striking plate 751 is connected along the direction that one end of the conductive plate 621 is provided with a contact, the middle part of the first arc striking plate 751 is bent and folded back to form a U-shaped body so that the other end of the first arc striking plate 751 extends into the arc extinguishing chamber 71, and thus, the conductive plate 621 is matched with the first arc striking plate 751 to form an annular structure encircling the periphery of the iron core 73; the second striking plate 752 is spaced opposite to the first striking plate 751, one end of the second striking plate 752 corresponds to one side of the moving contact 61, and the other side of the second striking plate 752 extends into the arc extinguishing chamber 71 along the inner side wall of the striking chamber.

The magnetic conduction assembly is arranged on one side of the arc-stop plate 72, which is opposite to the arc striking cavity, and the assembly holes are preferably arranged on the arc-stop plate 72 and the magnetic conduction assembly, the central axis of the iron core 73 is perpendicular to the arc-stop plate 72, so that the two ends of the iron core 73 are inserted into the assembly plates, and the assembly of the iron core 73, the arc-stop plate 72 and the magnetic conduction assembly is simpler and more convenient.

In this embodiment, the magnetic conductive assembly includes a first magnetic yoke 741 and a magnetic conductive plate 742 that are arranged side by side, the first magnetic yoke 741 corresponds to the middle part of the arc striking cavity, the magnetic conductive plate 742 corresponds to the area of the arc striking cavity near the moving contact 61, one side of the first magnetic yoke 741 near the fixed contact 62 is provided with a second assembly hole 7411 corresponding to the first assembly hole 721, and the end part of the iron core 73 is sequentially inserted into the first assembly hole 721 and the second assembly hole 7411; in addition, a mounting groove may be disposed on a side of the arc-stop plate 72 facing away from the arc striking cavity, and the magnetic conductive assembly is assembled by the mounting groove in a limited manner, where the mounting groove is, of course, a first mounting groove 722 and a second mounting groove 723, respectively, for assembling the first yoke 741 and the magnetic conductive plate 742, respectively. Of course, as other degraded embodiments, the magnetic conductive assembly may also include the first magnetic yoke 741 or the magnetic conductive plate 742.

As shown in fig. 13, the first magnetic yoke 741 includes a first plate 7410 and a second plate 7412, the first plate 7410 is attached to one side of the arc-shaped plate 72 opposite to the arc-shaped cavity, a through hole as a second assembly hole 7411 is formed in the middle of the first plate 7410, one side edge of the first plate 7410 is connected with one end side wall of the second plate 7412, so that an included angle is formed between the first plate 7410 and the plate surface of the second plate 7412, in fig. 13, a transition section is connected between the first plate 7410 and the second plate 7412, so that the first plate 7410 and the plate surface of the second plate 7412 are perpendicular to each other, the other side edge of the second plate 7412 is attached to one side of the arc-shaped plate 72 opposite to the arc-shaped cavity, preferably the other side edge of the second plate 7412 is inserted and limited to the arc-shaped plate 72, the other end of the second plate 7412 is bent to form a bending part 7413, the bending part 7413 and the first plate 7410 are located on the same side of the second plate 7412, in this embodiment, a first mounting groove 722 is provided on one side of the arc-shaped baffle 72 opposite to the arc striking cavity, the first mounting groove 723 comprises a first mounting area and a second mounting area which are mutually connected, the first mounting area is used for assembling the first plate 7410 and is provided with a first assembling hole 721, the groove bottom recession degree of the second mounting area is larger than that of the first mounting area, a slot for inserting the limiting second plate 7412 is formed in the second mounting area, the first yoke 741 is assembled in the first mounting groove 722, and the first yoke 741 and the arc-shaped baffle 72 are kept flat on the side opposite to the arc striking cavity.

As shown in fig. 3 and 7, when the contact mechanism is energized, it is known that the iron core 73 generates a magnetic field according to ampere's law, the magnetic field is generated in the arc striking cavity by the magnetic conduction assembly, the magnetic field of the arc generated in the arc striking cavity when the contact mechanism is disconnected receives lorentz force, the lorentz force and direction are marked with F and arrow directions in the drawing, in addition, the arc barrier 72 is made of gas generating material, and the arc is quickly introduced into the arc extinguishing chamber 71 under the common drive of gas generated at high temperature and lorentz force. In addition, the central axis of the iron core 73 is perpendicular to the arc-stop plate 72, so that the magnetic field direction generated by the iron core 73 is perpendicular to the arc-stop plate 72, and the maximum lorentz force is obtained by the arc.

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

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

Claims (10)

1. An arc extinguishing system comprises an arc extinguishing chamber (71), a pair of arc baffles (72) are arranged on one side of the arc extinguishing chamber (71), an arc striking cavity communicated with the arc extinguishing chamber (71) is formed between the arc baffles (72), a contact mechanism is arranged in the arc striking cavity and comprises a fixed contact (62) and a moving contact (61), and the arc extinguishing system is characterized in that: the arc extinguishing system further comprises an iron core (73) arranged in the arc striking cavity, at least a part of a conductive plate (621) of the static contact (62) surrounds the outer side of the iron core (73), and one side of each arc-isolating plate (72) opposite to the arc striking cavity is provided with a magnetic conduction assembly.

2. The arc extinguishing system of claim 1, wherein: the arc extinguishing device further comprises a first arc striking plate (751) connected with the fixed contact (62), the first arc striking plate (751) is in butt joint with one end of the conductive plate (621), the middle of the first arc striking plate (751) is bent and matched with the conductive plate (621) of the fixed contact (62) to form a structure encircling the outer side of the iron core (73), and the other end of the first arc striking plate (751) extends into the arc extinguishing chamber (71).

3. The arc extinguishing system of claim 1, wherein: the arc-shaped isolation plate (72) and the magnetic conduction assembly are provided with assembly holes, the central axis of the iron core (73) is perpendicular to the arc-shaped isolation plate (72), and two ends of the iron core (73) are correspondingly inserted into the assembly holes.

4. The arc extinguishing system of claim 1, wherein: and one side of the arc-stop plate (72) back to the arc striking cavity is provided with a mounting groove, and the magnetic conduction assembly is assembled in the mounting groove in a limiting way.

5. The arc extinguishing system according to any one of claims 1 to 4, wherein: the magnetic conduction assembly comprises a magnetic conduction plate (742) and a first magnetic yoke (741), wherein the magnetic conduction plate (742) and the first magnetic yoke (741) are arranged side by side and are respectively attached to the arc-isolating plate (72), the magnetic conduction plate (742) corresponds to the area, close to the moving contact (61), of the arc striking cavity, and the first magnetic yoke (741) corresponds to the middle part of the arc striking cavity.

6. The arc extinguishing system of claim 5, wherein: the arc-shaped isolation plate (72) is provided with a first assembly hole (721), one side of the first magnetic yoke (741) close to the fixed contact (62) is provided with a second assembly hole (7411) corresponding to the first assembly hole (721), and the iron core (73) is sequentially inserted into the first assembly hole (721) and the second assembly hole (7411).

7. The arc extinguishing system of claim 6, wherein: the first magnetic yoke (741) comprises a first plate (7410) and a second plate (7412), a through hole serving as a second assembly hole (7411) is formed in the middle of the first plate (7410), one side edge of the first plate (7410) is connected with one side wall of the second plate (7412), an included angle is formed between the first plate (7410) and the plate surface of the second plate (7412), the other end of the second plate (7412) is bent to form a bending part (7413), and the bending part (7413) and the first plate (7410) are located on the same side of the second plate (7412).

8. The arc extinguishing system of claim 1, wherein: the static contact (62) is located one side that the striking chamber is close to explosion chamber (71), and moving contact (61) swing in the striking intracavity in order to be close to or keep away from static contact (62), static contact (62) include conducting plate (621), the one end of conducting plate (621) is along being on a parallel with direction of explosion chamber (71) to the direction extension that deviates from moving contact (61), and the middle part of conducting plate (621) is crooked and around setting up in one side that iron core (73) are facing away from explosion chamber (71), and the other end of conducting plate (621) extends to the striking intracavity along the tangential of iron core (73) and is equipped with moving contact (61) complex contact.

9. The utility model provides a circuit breaker, includes the casing, is equipped with a pair of binding post at the both ends of casing, its characterized in that: an arc extinguishing system according to any one of claims 1-8 is provided between a pair of terminals.

10. The circuit breaker according to claim 9, characterized in that: the shell also comprises an operating mechanism and a contact mechanism, wherein the contact mechanism comprises a moving contact (61) and a fixed contact (62) which are oppositely arranged, the moving contact (61) is connected with one wiring terminal, and the fixed contact (62) is positioned between the operating mechanism and the arc extinguishing chamber (71) and is connected with the other wiring terminal; a short-circuit protection mechanism is arranged on one side of the static contact (62) opposite to the arc extinguishing chamber (71),

an overload protection mechanism (9) is arranged on one side of the arc extinguishing chamber (71) opposite to the moving contact (61), one end of the overload protection mechanism (9) and the fixed contact (62) are connected to the same wiring terminal, and the other end of the overload protection mechanism (9) extends to one side of the operating mechanism to trigger the operating mechanism to trip.

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