CN220172049U - Arc extinguishing chamber and circuit breaker - Google Patents

Abstract

The arc extinguishing chamber comprises an arc extinguishing chamber body, a plurality of arc extinguishing grid sheets and a magnetic blowing structure matched with the arc extinguishing grid sheets, an arc inlet of the arc extinguishing chamber body is used as an arc starting area to be matched with a contact mechanism, the arc extinguishing grid sheets of each grid sheet group are divided into two grid sheet groups, the arc extinguishing grid sheets of each grid sheet group are arranged along a first direction, the two grid sheet groups are opposite to each other at intervals in a second direction, an arc extinguishing area is formed in a region corresponding to each grid sheet group, the arc extinguishing chamber body between the two arc extinguishing areas forms an arc starting area communicated with the arc starting area, an arc entering the arc starting area is driven by the magnetic blowing structure to enter the two arc extinguishing areas and is discharged from an exhaust hole of the arc extinguishing chamber body, and the width of the arc starting area is respectively smaller than the width of the arc extinguishing area in a third direction, and the first direction, the second direction and the third direction are mutually perpendicular.

Description

Arc extinguishing chamber and circuit breaker

Technical Field

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

Background

The circuit breaker is a device which plays an electric protection role in a circuit, and in the breaking process, an air medium between a movable contact and a static contact discharges under the action of voltage so as to generate an electric arc, and in the breaking process, high-temperature gas can be generated. In circuit breakers, an arc extinguishing chamber is usually provided for extinguishing an arc, the extinguishing capacity of which directly determines the breaking process and the performance of the short-circuit current of the whole circuit breaker.

In an ac system, an ac has a zero crossing point, so that the arc is extinguished relatively easily, however, a dc has no zero crossing point, and the arc is extinguished relatively difficult, so that in order to improve the breaking capacity of the circuit breaker, it is generally adopted to raise the arc voltage of the arc extinguishing chamber during the short-circuit breaking, wherein the effect of increasing the number of arc extinguishing bars in the arc extinguishing chamber is most obvious. However, as the circuit breaker gradually develops toward miniaturization and high performance, the arc extinguishing chamber is limited by the internal space of the circuit breaker, and the thickness and the distance of the arc extinguishing gate sheets cannot be ensured only by increasing the number of the arc extinguishing gate sheets, and part of the arc extinguishing gate sheets are easy to short or not fully utilized in the breaking process, so that the arc extinguishing effect is poor.

Disclosure of Invention

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

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

the utility model provides an arc extinguishing chamber, which comprises an arc extinguishing cavity, a plurality of arc extinguishing grid plates and a magnetic blowing structure matched with the arc extinguishing grid plates, wherein an arc inlet of the arc extinguishing cavity is used as an arc starting area to be matched with a contact mechanism, the arc extinguishing grid plates of each grid plate group are divided into two grid plate groups, the arc extinguishing grid plates of each grid plate group are arranged along a first direction, the two grid plate groups are opposite at intervals in a second direction, an arc starting area is formed in a region corresponding to each grid plate group, the arc extinguishing cavity between the two arc extinguishing areas forms an arc running area communicated with the arc starting area, an arc entering the arc running area is driven by the magnetic blowing structure to enter the two arc extinguishing areas and is discharged from an exhaust hole of the arc extinguishing cavity, and the width of the arc running area is respectively smaller than the width of the arc extinguishing area and the width of the arc starting area in a third direction, and the first direction, the second direction and the third direction are mutually perpendicular.

Further, the exhaust hole is located one side that the arc running district was kept away from to every arc extinguishing district, and one side that every bars piece group towards the arc running district is equipped with the arc extinguishing groove, and in the third direction, the opening interval of arc extinguishing groove is greater than the width that runs the arc running district.

Further, one end of each arc-extinguishing grating sheet is provided with an arc-extinguishing gap, the arc-extinguishing gaps of the arc-extinguishing grating sheets of the same grating sheet group are communicated along a first direction to form arc-extinguishing grooves, and the arc-extinguishing grooves of each grating sheet group face the arc-running area.

Further, the extending direction of each arc extinguishing grating sheet forms an included angle with the second direction, the arc extinguishing grating sheets of the same grating sheet group are mutually parallel, and the two grating sheet groups are symmetrically arranged on two sides of the arc running area.

Further, the magnetic blowing structure comprises a gas generating part and a magnetic conduction assembly, wherein the gas generating part is arranged on two sides of the arc extinguishing cavity along the first direction, the magnetic conduction assembly comprises a magnetic conduction part assembled in the arc extinguishing cavity, and the magnetic conduction part forms a magnetic field in the third direction in the arc extinguishing cavity.

Further, the arc extinguishing cavity is formed by two gas generating parts at intervals oppositely, one side of each gas generating part protrudes to form a protruding part, and a gap between the two protruding parts in the third direction is used as an arc running area.

Further, the magnetic blowing structure further comprises a connecting piece, wherein the connecting piece is used for electrically connecting one ends of the two grid sheet groups, which are far away from the arcing region, and sealing one ends of the arcing region, which are far away from the arcing region.

Further, the magnetic conduction piece includes the magnetic conduction board of a pair of interval setting, and every magnetic conduction board insulation assembly is in the gas production spare that every bulge corresponds, the magnetic conduction subassembly is still including setting up in the striking piece that runs the arc district, in the second direction, the length of striking piece is less than the clearance between two bars piece group, the striking piece is located between a pair of magnetic conduction board, and striking piece, magnetic conduction board and connecting piece electricity are connected, make the pointed end of striking piece towards the arc district.

Further, a cavity for assembling the magnetic conduction plate is formed in the gas generating piece, and a slot communicated with the cavity is positioned on one side of the protruding part and is used for inserting the magnetic conduction plate.

Further, two arc striking plates are arranged in the arc striking area, the two arc striking plates are opposite at intervals in the second direction, the first end of each arc striking plate extends outwards from the arc inlet along the side wall of the arc extinguishing cavity, and the second end of each arc striking plate bends and extends towards the adjacent arc extinguishing area.

Further, the second end of the striking plate is parallel to and spaced apart from the arc extinguishing bars of the adjacent bar group.

Further, the arcing zone is also provided with at least one limiting piece, and the limiting piece is used for positioning and assembling the arcing plate in the arcing zone.

The utility model also provides a circuit breaker, which comprises a shell and a contact mechanism arranged in the shell, wherein the arc extinguishing chamber is further arranged in the shell, and the contact mechanism is correspondingly arranged in the arcing zone.

Preferably, a pair of connecting terminals is further arranged at two ends of the shell, the contact mechanism is connected between the pair of connecting terminals and comprises a moving contact and a fixed contact which are matched with each other, the moving contact is connected with one connecting terminal, the arc extinguishing chamber is positioned between the moving contact and the other connecting terminal, the fixed contact is connected with the other connecting terminal and is opposite to the moving contact in interval in the second direction, the fixed contact is arranged outside the arc extinguishing chamber in the first direction, and the fixed contact and the arc extinguishing chamber are arranged in a lamination mode in the third direction and correspondingly cover an arcing region, one arc extinguishing region and one end of the arc running region far away from the arcing region.

Preferably, the static contact comprises a conductive plate, the conductive plate and the arc extinguishing chamber are arranged in a stacked mode in the third direction, the conductive plate comprises a first plate, a second plate and a third plate which are sequentially connected, the first plate correspondingly covers the outer side of an arcing zone along the second direction, one end of the first plate, which is far away from the second plate, extends into the arcing zone and is provided with a static contact matched with the movable contact, the second plate correspondingly covers the outer side of the arc extinguishing zone along the first direction, the third plate correspondingly covers one end of the arc extinguishing zone, which is far away from the arcing zone, along the second direction, and one end, which is far away from the second plate, of the third plate is bent to form a wiring part.

According to the arc extinguishing chamber and the circuit breaker, the arc starting area, the arc running area and the arc extinguishing areas in the arc extinguishing chamber form chambers with different sections, and according to the Laval nozzle principle, the air flow is compressed when flowing through the arc running areas, so that the air reaches the two arc extinguishing areas to be accelerated, the speed of entering the arc extinguishing chamber by an arc is accelerated under the cooperation of a magnetic blowing structure, the arcing time is shortened, and the arc extinguishing effect of the arc extinguishing chamber is improved.

In addition, the exhaust hole is located the one side that the arc running district was kept away from to every arc extinguishing district, and every bars piece group is equipped with the arc chute towards one side that runs the arc district, and in the third direction, the opening interval of arc chute is greater than the width that runs the arc district for the speed that the arc got into the arc extinguishing district does benefit to the tail gas in arc extinguishing district to be discharged, further the arc extinguishing effect.

In addition, the magnetic blowing structure comprises a gas generating piece and a magnetic conduction assembly, and particularly an arc extinguishing cavity is formed by a pair of gas generating pieces, and the magnetic conduction assembly is inserted into the gas generating pieces and has the advantage of simplicity and convenience in assembly.

In addition, the magnetic blowing structure further comprises a connecting piece, one ends of the two grid sheet groups, far away from the arcing zone, are electrically connected by the connecting piece, the arcing piece and the magnetic conduction plate are matched, so that the driving arc is facilitated to completely erode each grid sheet group, the utilization rate of the grid sheet groups is improved, and the rapid current limiting is realized under the combined action of the two grid sheet groups.

In addition, in the circuit breaker of assembly, the static contact sets up with the explosion chamber range upon range of in the third direction, makes the static contact be corresponding to cover arc starting zone, an arc extinguishing zone and keep away from the arc running zone one end of arc starting zone, according to the relation of the electric current direction and the arc current that flow through the static contact, the magnetic field that the cooperation produced further accelerates the removal of electric arc to the arc extinguishing zone, does benefit to the arc extinction.

Drawings

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

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

fig. 3 is an exploded view of the arc chute of the present utility model;

FIG. 4 is a schematic view of the structure of the arcing, running and extinguishing zones according to the present utility model;

fig. 5 is a schematic cross-sectional view of the arc chute of the present utility model along a second direction;

fig. 6 is a schematic cross-sectional view of the arc chute of the present utility model in a first direction;

FIG. 7 is a schematic diagram of a magnetic conductive assembly according to the present utility model;

FIG. 8 is a schematic view of an arc of the contact mechanism of the present utility model upon breaking;

FIG. 9 is a schematic view of an arc with the contact mechanism of the present utility model at maximum breaking distance;

FIG. 10 is a schematic diagram of the movement track of an arc in an arc run-out area and an arc extinguishing area according to the present utility model;

fig. 11 is a schematic view of a moving track of an arc in an arc extinguishing area in the present utility model;

fig. 12 is a schematic structural diagram of a stationary contact and an arc extinguishing chamber in the present utility model;

fig. 13 is an exploded view of the stationary contact and the arc chute of the present utility model;

reference numerals:

1-arc extinguishing chamber, 101-arc inlet, 102-exhaust hole, 103-arc starting area, 104-arc running area, 105-first arc extinguishing area, 106-second arc extinguishing area, 11-gas generating piece, 111-protruding part, 112-slot, 113-extending part, 120-arc extinguishing grid piece, 121-first grid piece group, 122-second grid piece group, 123-arc extinguishing groove, 13-magnetic conduction piece, 14-arc striking piece, 15-connecting piece, 161-first arc striking plate, 162-second arc striking plate, 17-limiting piece, 2-moving contact, 3-static contact, 311-first plate, 312-second plate, 313-third plate, 314-wiring part and 32-assembly plate.

Detailed Description

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

The circuit breaker comprises a shell, an operating mechanism and at least one conductive unit are assembled in the shell, one end of the operating mechanism is connected with a handle extending out of the shell, each conductive unit comprises a pair of wiring terminals and a contact mechanism arranged between the pair of wiring terminals, each contact mechanism comprises a moving contact 2 and a fixed contact 3 which are matched with each other, the moving contact 2 is in linkage connection with the operating mechanism and is electrically connected with one wiring terminal, the fixed contact 3 is electrically connected with the other wiring terminal, an arc extinguishing chamber 1 is matched and arranged at one side of the contact mechanism, the connecting line direction between the pair of wiring terminals is taken as a first direction, the contact mechanism and the arc extinguishing chamber 1 are arranged along the first direction, the moving contact 2 and the fixed contact 3 are opposite to each other at intervals in a second direction, a plurality of arc extinguishing grid pieces 120 and a magnetic blowing structure are assembled in an arc inlet 101 of the arc extinguishing chamber 1 as an arc starting area 103 which is matched with the contact mechanism, and the magnetic blowing structure is matched with the arc extinguishing grid pieces 120 to extinguish an arc generated by the contact mechanism; the two adjacent conductive units are arranged in the shell in parallel along the third direction, and all the movable contacts 2 are connected in a linkage manner to ensure synchronous opening and closing actions.

Further, each conductive unit is further provided with a protection mechanism, the protection mechanism triggers the operation mechanism to trip through a traction rod matched with the operation mechanism, wherein the protection mechanism comprises a short-circuit protection mechanism and/or an overload protection mechanism, when a short-circuit fault occurs, the short-circuit protection mechanism triggers the operation mechanism to trip, so that the breaker is disconnected and powered off, and when an overload fault occurs, the overload protection mechanism triggers the operation mechanism to trip, so that the breaker is disconnected.

As shown in fig. 1 to 6, the improvement point of the present utility model is that the plurality of arc extinguishing bars 120 are divided into two bar groups, the plurality of arc extinguishing bars 120 of each bar group are sequentially arranged at one side of the arc extinguishing chamber at intervals along the first direction, the two bar groups are opposite at intervals along the second direction, so that the area corresponding to each bar group is assembled to form an arc extinguishing area, the arc extinguishing chamber between the two arc extinguishing areas forms an arc extinguishing area 104 communicated with the arcing area 103, the arc entering the arc extinguishing area 104 is driven by the magnetic blowing structure to enter the two arc extinguishing areas and is discharged from the air discharging hole 102 of the arc extinguishing chamber, and in the third direction, the width of the arc extinguishing area 104 is respectively smaller than the width of the arc extinguishing area and the width of the arcing area 103, and the first direction, the second direction and the third direction are mutually perpendicular.

Wherein, arc starting area 103, run arc district 104 and the different cavity of arc extinction district formation cross-section in the arc extinction intracavity, according to Laval nozzle principle can know, the air current can be compressed when flowing through run arc district 104, makes gas reach two arc extinction district and is accelerated, under the cooperation of magnetic blow structure, has accelerated the speed that the electric arc got into the arc extinction intracavity, has shortened the arcing time, has promoted the extinction effect of explosion chamber 1.

Preferably, as shown in fig. 5 and 6, the exhaust hole 102 is located at one side of each arc extinguishing area far away from the arc extinguishing area 104, an arc extinguishing groove 123 is arranged at one side of each grid sheet group facing the arc extinguishing area 104, in the third direction, the opening interval of the arc extinguishing groove 123 is larger than the width of the arc extinguishing area 104, so that the speed of the arc entering the arc extinguishing area is accelerated, the exhaust gas of the arc extinguishing area is discharged, and the arc extinguishing effect is further improved.

Further, as shown in fig. 3-7, the magnetic blowing structure includes a gas generating member 11 and a magnetic conduction assembly, the gas generating member 11 is disposed along two sides of the arc extinguishing chamber, preferably, the gas generating member 11 forms a side wall of the arc extinguishing chamber, one side of the gas generating member 11 is provided with a protruding portion 111, and a gap between the two protruding portions 111 in a third direction is used as an arc running area 104; the magnetic conduction assembly comprises a magnetic conduction piece 13 and an arc striking piece 14, wherein the magnetic conduction piece 13 is assembled in the gas generating piece 11 in an insulating manner, a magnetic field in a third direction is formed in the arc extinguishing cavity by the magnetic conduction piece 13 and is used for being matched with the gas generating piece 11 and the grid plate groups for arc extinguishing, preferably, the magnetic conduction piece 13 comprises a pair of magnetic conduction plates, the pair of magnetic conduction plates are opposite in a third direction interval, and preferably, each magnetic conduction plate is inserted in the gas generating piece 11 in an insulating manner, the arc striking piece 14 is arranged in the arc running area 104 and is positioned between the pair of magnetic conduction plates and is used for reducing the magnetic resistance between the two magnetic conduction plates, the magnetic blowing effect is improved, preferably, the length of the arc striking piece 14 is smaller than a gap between the two grid plate groups in the second direction, and the two grid plate groups are prevented from being directly connected through the arc striking piece 14.

Further, the magnetic blowing structure further comprises a connecting piece 15, one end, far away from the arcing zone 103, of the two grid sheet groups is electrically connected through the connecting piece 15, the arcing piece 14 is electrically connected with the connecting piece 15, and the connecting piece 15, the arcing piece 14 and the magnetic conducting piece 13 are matched, so that the driving arc is beneficial to completely eroding each grid sheet group, the utilization rate of the grid sheet groups is improved, and the rapid current limiting is realized under the combined action of the two grid sheet groups.

Further, as shown in fig. 3 and 7, two arc striking plates are further disposed in the arc striking area 103 in a matching manner, the two arc striking plates are opposite to each other at intervals in the second direction, the first end of each arc striking plate extends along the side wall of the arc extinguishing chamber towards the arc inlet 101 for matching with the contact mechanism, the second end of each arc striking plate bends and extends towards the adjacent arc extinguishing area, and preferably, the second end of each arc striking plate is parallel to and opposite to the arc extinguishing gate 120 of the adjacent gate group at intervals, so as to facilitate matching with the contact mechanism for striking an arc.

Preferably, in the circuit breaker, the fixed contact 3 and the arc extinguishing chamber 1 are stacked in a third direction, and the fixed contact 3 correspondingly covers the arcing region 103, one arc extinguishing region and one end of the arc extinguishing region 104 far away from the arcing region 103, and according to the relation between the current direction flowing through the fixed contact 3 and the arc current, the magnetic field generated by matching can further accelerate the arc movement, so that the arc extinguishing is facilitated.

In the embodiment, the first direction, the second direction and the third direction are perpendicular to each other, and in the example of fig. 2, the left-right direction is the first direction, the up-down direction is the second direction, and the direction perpendicular to the paper surface is the third direction.

As shown in fig. 1 to 6, the arc extinguishing chamber 1 comprises an arc extinguishing chamber, an arc inlet 101 of the arc extinguishing chamber is opposite to a contact mechanism, an arc extinguishing chamber area corresponding to the arc inlet 101 is used as an arc starting area 103, an exhaust hole 102 of the arc extinguishing chamber is arranged on the side wall of the arc extinguishing chamber, a plurality of arc extinguishing grid plates 120 and a magnetic blowing structure are assembled in the arc extinguishing chamber, wherein the plurality of arc extinguishing grid plates 120 are divided into two grid plate groups, the two grid plate groups are respectively arranged on two sides of the arc extinguishing chamber, the arc extinguishing grid plates 120 of each grid plate group are respectively arranged at intervals along a first direction, the two grid plate groups are opposite at intervals along a second direction, the arc extinguishing chamber area corresponding to each grid plate group is an arc starting area, the arc extinguishing chamber between the two arc extinguishing areas forms an arc running area 104 communicated with the arc starting area 103, the arc entering the arc running area 104 is driven by the magnetic blowing structure to enter the two arc extinguishing areas and is discharged from the exhaust hole 102, preferably, the exhaust hole 102 is positioned at one side far away from the arc running area 104, wherein in the third direction, the width (indicated by D2 in fig. 6) of the arc running area 104 is respectively smaller than the width of the arc extinguishing area and the width (indicated by D1 in fig. 6) of the arc starting area 103, so that a Laval nozzle structure with the minimum inner diameter of the cavity of the arc running area 104 is formed in the arc extinguishing chamber 1, according to the Laval nozzle principle, the airflow is compressed when flowing through the arc running area 104, so that the gas reaches the two arc extinguishing areas to be accelerated, the speed of the arc entering the arc extinguishing chamber is accelerated under the cooperation of the magnetic blowing structure, the arc burning time is shortened, and the arc extinguishing effect of the arc extinguishing chamber 1 is improved.

The magnetic blowing structure comprises two gas generating pieces 11 and a magnetic conduction assembly, each gas generating piece 11 is arranged along the first direction, the two gas generating pieces 11 are spaced in the third direction, the two grid sheet groups and the magnetic conduction assembly are assembled between the two gas generating pieces 11, and the magnetic conduction assembly is assembled on the side wall of the arc extinguishing cavity in an insulating mode and used for forming a magnetic field in the third direction.

As shown in fig. 3, the two gas generating members 11 are formed with arc extinguishing chambers at intervals, so that the whole arc extinguishing chamber is in a structure with four open sides, an opening of the arc extinguishing chamber facing one end of the contact mechanism is an arc inlet 101, other open sides of the arc extinguishing chamber can be used as an exhaust hole 102 of the arc extinguishing chamber, an arc starting area 103 is arranged in an arc extinguishing chamber area corresponding to the arc inlet 101, two grid plates are assembled between the two gas generating members 11 at intervals along a second direction respectively, preferably, each grid plate group is in plug-in fit with the gas generating member 11, that is, each grid plate group comprises a pair of side plates, a plurality of parallel arc extinguishing grid plates 120 which are arranged at intervals are arranged between a pair of side plates, arc extinguishing gaps are formed between two adjacent arc extinguishing grid plates 120, two ends of each arc extinguishing gap are respectively communicated with the arc starting area 104 and the exhaust hole 102, one end of each arc extinguishing grid plate 120 is provided with an arc extinguishing gap, the arc extinguishing gaps of the same group of arc extinguishing bars 120 are communicated along a first direction to form an arc extinguishing groove 123 (see fig. 3), the arc extinguishing groove 123 faces the arc running area 104, the gas generating piece 11 is provided with a plurality of mounting grooves for being in one-to-one correspondence with the arc extinguishing bars 120, in fig. 3, the bars positioned at the lower side are used as a first bars 121, the bars positioned at the upper side are used as a second bars 122, correspondingly, the area corresponding to the first bars 121 is used as a first arc extinguishing area 105, the area corresponding to the second bars 122 is used as a second arc extinguishing area 106, the space between the first arc extinguishing area 105 and the second arc extinguishing area 106 is used as an arc running area 104, the arc running area 104 is communicated with the arc starting area 103, at this moment, the first arc extinguishing area 105 and the second arc extinguishing area 106 are far away from the open area on one side of the arc running area 104, the exhaust hole 102 can be considered as an exhaust hole 102, and the exhaust hole 102 can correspond to one end of an arc extinguishing gap. Of course, when the arc extinguishing chamber is in a closed structure as a whole, the exhaust holes 102 can be independently formed, and the exhaust holes 102 are respectively positioned on the side walls of the arc extinguishing chamber at two sides of the arc inlet 101.

In this embodiment, as shown in fig. 3, 4 and 8-11, the extending direction of each arc extinguishing gate sheet 120 forms an included angle with the second direction, and the arc extinguishing gate sheets 120 of the same gate sheet group are parallel to each other, so that two gate sheet groups form a symmetrical structure with respect to the arc running area 104, in fig. 3 and 4, one ends of the arc extinguishing gate sheets 120 provided with arc extinguishing gaps are inclined towards the direction close to the arc starting area 103, which is beneficial to adopting arc extinguishing gate sheets 120 with larger length. Of course, the extending direction of each arc extinguishing gate 120 may be along the second direction.

Preferably, as shown in fig. 5, one side of each gas generating member 11 is protruded to form a protrusion 111, a gap between the two protrusions 111 in the third direction is used as an arc-quenching zone 104, thereby forming a portion with the smallest inner diameter in the arc-quenching chamber, so that the arc-quenching chamber is integrally formed into a laval nozzle structure, or similar to the laval nozzle structure, the arc flowing into the arc-quenching zone 104 can flow in an accelerated manner, in this embodiment, an edge of each grid assembly is abutted against an edge of the protrusion 111, an opening interval (the opening interval of the arc-quenching slot 123 is denoted by D3 in fig. 5) of each arc-quenching slot 123 in the third direction is used as a portion with the smallest intermediate interval of each arc-quenching zone, the opening interval of each arc-quenching slot 123 in the third direction is larger than the gap between the two protrusions 111, and the width of the corresponding arc-quenching zone is also larger than the width of the arc-quenching zone 104, and in fig. 5, a slope is provided at a corner portion of each protrusion 111 to engage with the arc-quenching slot 123, so that the rapid flow between the arc-quenching zone 104 and the arc-quenching zone is facilitated.

In this embodiment, as shown in fig. 3 and 7, the magnetic conduction assembly includes a magnetic conduction member 13 and an arc striking member 14, where the magnetic conduction member 13 is assembled in the gas generating member 11 in an insulating manner, preferably, the magnetic conduction member 13 includes a pair of magnetic conduction plates, each magnetic conduction plate is assembled in the gas generating member 11 corresponding to each protrusion 111 in an insulating manner, the arc striking member 14 is disposed in the arc running region 104 and is connected to one end of the pair of magnetic conduction plates away from the arc striking region 103, the magnetic resistance between the pair of magnetic conduction plates is reduced by the arc striking member 14, the tip of the arc striking member 14 faces the arc striking region 103, and in the second direction, the length of the arc striking member 14 is smaller than the length between the two grid groups, so that the two grid groups cannot be directly electrically connected through the arc striking member 14. As shown in fig. 3, the striking member 14 is arranged side by side in the third direction by a plurality of triangular striking pieces.

In this embodiment, it is preferable that the magnetic conductive plate is in plug-in fit with the gas generating member 11, that is, a cavity capable of assembling the magnetic conductive plate is formed inside the gas generating member 11, the slot 112 communicating with the cavity is located at one side of the protruding portion 111, in fig. 3, a limit groove is formed at one end of the protruding portion 111 away from the arcing region 103, the shape of the limit groove is preferably matched with that of the arcing member 14, the limit groove in this embodiment is triangular, the arcing member 14 is limited in the limit groove, the slot 112 is formed at the joint of the limit groove and the protruding portion 111, and the magnetic conductive plate is plugged in the cavity through the slot 112, thereby simplifying the assembling process.

Further, the magnetic blowing structure further includes a connecting member 15, the connecting member 15 electrically connects one ends of the two grid groups away from the arcing region 103 together, one end of the arc running region 104 away from the arcing region 103 is closed by the connecting member 15, so that the tip of the arc striking member 14 faces away from the connecting member 15, and one side of the arc striking member 14 facing away from the tip is electrically connected with the connecting member 15, in this embodiment, the connecting member 15 connects one ends of the two grid groups away from the arcing region 103 together in series, so that each grid group generates a stronger electric field between the arc running region 103 and the arc extinguishing grid 120 away from the arcing region 103 (that is, the head end arc extinguishing grid 120 and the tail end arc extinguishing grid 120 of the same grid group), and the arc current needs to break through all the arc extinguishing grid 120 of each grid group to form an arc current, thereby driving the arc to erode each grid group, and further performing rapid current limiting under the combined action of the two grid groups.

In this embodiment, two arc striking plates are further disposed in the arc striking area 103, the two arc striking plates are opposite to each other at intervals in the second direction, the first end of each arc striking plate extends outwards from the arc extinguishing chamber side wall toward the arc inlet 101, the second end of each arc striking plate extends towards the adjacent arc extinguishing area in a bending manner, preferably, the second end of each arc striking plate is parallel to and opposite to the arc extinguishing gate 120 of the adjacent gate group, in fig. 8-11, the arc striking plate located at the lower side of the arc running area 104 is a first arc striking plate 161, the arc striking plate located at the upper side of the arc running area 104 is a second arc striking plate 162, wherein the second end of the first arc striking plate 161 extends into the first arc extinguishing area 105 and is opposite to the arc extinguishing gate 120 of the first gate group 121 at intervals, and the second end of the second arc striking plate 162 extends into the second arc extinguishing area 106 and is opposite to the arc extinguishing gate 120 of the second gate group 122 at intervals.

Further, at least one limiting member 17 is further disposed in the arcing zone 103, the limiting member 17 is used for positioning the arcing plate in the arcing zone 103, preferably as shown in fig. 3, an extension portion 113 is formed at one end of the gas generating member 11, the extension portion 113 is correspondingly formed by extending from a side position forming the arcing zone 103 along the second direction, the extension portion 113 is engaged with the grid set, in this embodiment, the extension portion 113 between the second grid set 122 and the arcing zone 103 is provided with one limiting member 17, and the second arcing plate 162 is positioned along one side of the limiting member 17. Similarly, an extension 113 may be disposed between the first grid set 121 and the arcing region 103, where the extension 113 may also be provided with a limiting member 17 for positioning the first arcing plate 161.

The working principle of the arc extinguishing chamber 1 of the embodiment is as follows:

as shown in fig. 8, when the contact mechanism just starts breaking, an arc is generated between the moving contact 2 and the fixed contact 3, the arc root is driven by the magnetic blowing assembly to move rapidly, the arc root moves into the first arc extinguishing area 105 along the first arc striking plate 161, and the arc column starts to enter the arc running area 104.

As shown in fig. 9, when the breaking distance between the moving contact 2 and the fixed contact 3 is the largest, the electrical gap between the moving contact 2 and the second striking plate 162 is reduced to the smallest, the moving contact 2 discharges the second striking plate 162, so that the arc at the moving contact 2 is quickly transferred into the second arc extinguishing region 106 along the second striking plate 162 under the action of magnetic blowing, and at this time, the arc column enters the arc extinguishing region 104.

As shown in fig. 10, when an arc enters the arc running region 104, a magnetic field along a third direction is generated between the two magnetic conductive plates due to a magnetic saturation state in which the magnetic conductive components are rapidly magnetized, the arc of the arc running region 104 always receives lorentz force along the second direction, during the movement of the arc, the arc preferentially contacts with the tip of the arc striking member 14 and discharges the arc, the arc striking member 14 and the connecting member 15 obtain an arc potential, then as shown in fig. 11, since the connecting member 15 electrically connects one end of the two grid plate groups away from the arc striking region 103, the connecting member 15 is equipotential with the arc, each grid set forms a stronger electric field between the arc extinguishing grid 120 (namely, the head end arc extinguishing grid 120 and the tail end arc extinguishing grid 120 of the same grid set) close to the arcing region 103 and far away from the arcing region 103, but in the second direction, the electric gap of one end of the two grid sets far away from the arcing region 103 is far smaller than the width of the arc running region 104 due to the connecting piece 15, and the electric gap of one end of the two grid sets far away from the arcing region 103 is also smaller than the gap between the arc striking piece 14 and the two grid sets, so that an arc current forming loop must break through each grid set, thereby driving an arc to completely erode each grid set, improving the utilization rate of the grid sets, and realizing rapid current limiting under the combined action of the two grid sets.

When the arc extinguishing chamber 1 of the embodiment is assembled in the circuit breaker, the casing of the circuit breaker is provided with the exhaust port, and the exhaust port is correspondingly communicated with the exhaust hole 102 of the arc extinguishing chamber 1 and is used for exhausting the tail gas generated by the arc extinguishing chamber 1 out of the casing, and the specific position and structure of the exhaust port can adopt the prior art.

A pair of wiring terminals are arranged in a shell of the circuit breaker, a pair of wiring terminals are respectively located at two ends of the shell, a contact mechanism and an arc extinguishing chamber 1 are arranged in the middle of the shell, the contact mechanism and the arc extinguishing chamber 1 are arranged between the pair of wiring terminals of the circuit breaker along a first direction, the contact mechanism correspondingly stretches into an arcing region 103, a moving contact 2 is electrically connected with one wiring terminal, a fixed contact 3 is integrally arranged outside the arc extinguishing chamber 1 along the first direction, the fixed contact 3 and the arc extinguishing chamber 1 are arranged in a stacked mode in a third direction, the fixed contact 3 correspondingly covers one end of an arcing region 103, one arcing region and one end of an arcing region 104 far away from the arcing region 103, one end of the fixed contact 3 extends into the arcing region 103 to be connected with a first arc striking plate 161, the other end of the fixed contact 3 is connected with the other wiring terminal far away from the moving contact 2, and movement of the arcing region is further accelerated according to the relation between the current direction flowing through the fixed contact 3 and the arcing current, and arc extinguishing region is facilitated.

As shown in fig. 12 and 13, the fixed contact 3 includes a mounting plate 32 and a conductive plate, wherein the mounting plate 32 is stacked on one side outside the arc extinguishing chamber 1 along a third direction, the mounting plate 32 provides a mounting position for the conductive plate, the fixed contact 3 in the drawing correspondingly covers the arc starting area 103, the second arc extinguishing area 106 and one end of the arc running area 104 far away from the arc starting area 103 along the third direction, the conductive plate includes a first plate 311, a second plate 312 and a third plate 313 which are sequentially connected, the first plate 311 is correspondingly arranged on the outer side of the arc starting area 103 along the second direction, one end of the first plate 311 far away from the second plate 312 extends into the arc starting area 103 and is provided with a fixed contact matched with the movable contact 2, the first arc striking plate 161 is electrically connected with the first plate 311, the second plate 312 correspondingly covers the outer side of the second arc extinguishing area 106 along the first direction, the third plate 313 correspondingly covers one end of the arc running area 104 far away from the arc starting area 103 along the second direction, one end of the third plate 313 far away from the second plate 312 forms a wiring part 314, and the wiring part 314 is connected with a wiring terminal.

The principle of further accelerating the arc movement of the fixed contact 3 is as follows:

as shown in fig. 12, the static contact 3 enters the driven contact 2 to flow out in the current I direction, the static contact 3 correspondingly generates a magnetic field which is vertically directed into the paper surface in the arc extinguishing chamber 1 according to the right-hand spiral rule, namely, a magnetic field in the third direction, and the magnitude of the magnetic field is related to the magnitude of short-circuit current.

Specifically, when the contact mechanism is just disconnected, an arc is generated between the moving contact 2 and the fixed contact 3, the current direction in the first plate 311 is always opposite to the current direction of the arc, and the arc is driven to rapidly transfer according to the principle of repulsive current, so that the ablation of the arc to the fixed contact 3 is reduced, an arc root is rapidly transferred under the combined action of a magnetic field generated by the first plate 311 and a magnetic blowing structure, the arc root enters the first arc extinguishing area 105 along the first arc striking plate 161, and likewise, an arc column starts to enter the arc running area 104 under the combined action of magnetic blowing and air blowing.

When the breaking distance between the moving contact 2 and the fixed contact 3 is maximum, the electrical gap between the moving contact 2 and the second arc striking plate 162 is reduced to the minimum, the moving contact 2 discharges the second arc striking plate 162, so that the electric arc of the moving contact 2 rapidly moves to the second arc extinguishing region 106 along the second arc striking plate 162 under the action of the first plate 311 and the gas generating part 11, at this time, the arc column already enters the arc running region 104, but at this time, the magnetic field generated by the fixed contact 3 causes the electric arc to be subjected to the lorentz force towards the first arc extinguishing region 105, that is, the lorentz force faces towards the lower part in fig. 12, and thus, the arc column rapidly enters the two arc extinguishing regions under the combined action of magnetic blowing and gas blowing.

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 (15)

1. The explosion chamber, including explosion chamber, a plurality of arc extinguishing bars piece (120) and with arc extinguishing bars piece (120) complex magnetic blow structure, arc inlet (101) of explosion chamber are as arc starting zone (103) and contact mechanism cooperation, its characterized in that: the arc extinguishing bars (120) are divided into two bar groups, the arc extinguishing bars (120) of each bar group are arranged along the first direction, the two bar groups are opposite at intervals in the second direction, the area corresponding to each bar group is formed into an arc extinguishing area, an arc extinguishing cavity between the two arc extinguishing areas forms an arc running area (104) communicated with the arc starting area (103), an arc entering the arc running area (104) is driven by a magnetic blowing structure to enter the two arc extinguishing areas and be discharged from an exhaust hole (102) of the arc extinguishing cavity, the width of the arc running area (104) is respectively smaller than the width of the arc extinguishing area and the width of the arc starting area (103) in the third direction, and the first direction, the second direction and the third direction are mutually perpendicular.

2. The arc chute of claim 1 wherein: the exhaust hole (102) is located at one side of each arc extinguishing area far away from the arc running area (104), an arc extinguishing groove (123) is arranged at one side of each grid sheet group facing the arc running area (104), and in the third direction, the opening interval of the arc extinguishing groove (123) is larger than the width of the arc running area (104).

3. The arc chute of claim 2 wherein: one end of each arc-extinguishing grating sheet (120) is provided with an arc-extinguishing gap, the arc-extinguishing gaps of the arc-extinguishing grating sheets (120) of the same grating sheet group are communicated along a first direction to form arc-extinguishing grooves (123), and the arc-extinguishing grooves (123) of each grating sheet group face the arc-running area (104).

4. An arc chute as claimed in claim 3, wherein: the extending direction of each arc extinguishing grating sheet (120) forms an included angle with the second direction, the arc extinguishing grating sheets (120) of the same grating sheet group are mutually parallel, and the two grating sheet groups are symmetrically arranged at two sides of the arc running area (104).

5. The arc chute of claim 1 wherein: the magnetic blowing structure comprises a gas generating part (11) and magnetic conduction components, wherein the gas generating part (11) is arranged on two sides of the arc extinguishing cavity along the first direction, the magnetic conduction components comprise magnetic conduction parts (13) assembled in the arc extinguishing cavity, and the magnetic conduction parts (13) form a magnetic field in the third direction in the arc extinguishing cavity.

6. The arc chute of claim 5 wherein: the arc extinguishing cavity is formed by two gas generating pieces (11) at intervals oppositely, one side of each gas generating piece (11) protrudes to form a protruding part (111), and a gap between the two protruding parts (111) in a third direction is used as an arc running area (104).

7. The arc chute of claim 5 wherein: the magnetic blowing structure further comprises a connecting piece (15), wherein the connecting piece (15) is used for electrically connecting one end of the two grid sheet groups, which is far away from the arcing region (103), and sealing one end of the arc running region (104), which is far away from the arcing region (103).

8. The arc chute of claim 7 wherein: the magnetic conduction piece (13) comprises a pair of magnetic conduction plates arranged at intervals, each magnetic conduction plate is assembled in a gas generating piece (11) corresponding to each protruding portion (111) in an insulating mode, the magnetic conduction assembly further comprises an arc striking piece (14) arranged in an arc striking area (104), the length of the arc striking piece (14) is smaller than the gap between two grid sheet groups in the second direction, the arc striking piece (14) is located between the pair of magnetic conduction plates, and the arc striking piece (14), the magnetic conduction plates and the connecting piece (15) are electrically connected, so that the tip of the arc striking piece (14) faces the arc striking area (103).

9. The arc chute of claim 8 wherein: the inside of the gas generating piece (11) forms a cavity for assembling the magnetic conduction plate, and a slot (112) communicated with the cavity is positioned at one side of the protruding part (111) for inserting the magnetic conduction plate.

10. The arc chute of claim 1 wherein: two arc striking plates are arranged in the arc striking area (103), the two arc striking plates are opposite at intervals in the second direction, the first end of each arc striking plate extends outwards from the arc extinguishing chamber side wall to the arc inlet (101), and the second end of each arc striking plate bends and extends to the adjacent arc extinguishing area.

11. The arc chute as in claim 10 wherein: the second ends of the striking plates are parallel to and spaced apart from the arc extinguishing bars (120) of the adjacent bar groups.

12. The arc chute as in claim 10 wherein: the arcing zone (103) is further provided with at least one limiting piece (17), and the limiting piece (17) is used for positioning and assembling the arcing plate in the arcing zone (103).

13. The circuit breaker, including the shell and set up the contact mechanism in the shell, its characterized in that: the arc extinguishing chamber (1) according to any one of claims 1-12 is also arranged in the housing, and the contact mechanism is correspondingly arranged in the arcing zone (103).

14. The circuit breaker of claim 13, wherein: the two ends of the shell are further provided with a pair of wiring terminals, the contact mechanism is connected between the pair of wiring terminals and comprises a moving contact (2) and a fixed contact (3) which are matched with each other, the moving contact (2) is connected with one wiring terminal, the arc extinguishing chamber (1) is located between the moving contact (2) and the other wiring terminal, the fixed contact (3) is connected with the other wiring terminal and is opposite to the moving contact (2) in interval in the second direction, the fixed contact (3) is arranged outside the arc extinguishing chamber (1) along the first direction, and the fixed contact (3) and the arc extinguishing chamber (1) are arranged in a lamination mode in the third direction and correspondingly cover the arcing region (103), one arc extinguishing region and one end of the arc running region (104) far away from the arcing region (103).

15. The circuit breaker of claim 14, wherein: the static contact (3) comprises a conductive plate, the conductive plate and the arc extinguishing chamber (1) are arranged in a stacked mode in the third direction, the conductive plate comprises a first plate (311), a second plate (312) and a third plate (313) which are sequentially connected, the first plate (311) is correspondingly covered on the outer side of the arcing region (103) along the second direction, one end, away from the second plate (312), of the first plate (311) extends into the arcing region (103) and is provided with a static contact matched with the movable contact (2), the second plate (312) is correspondingly covered on the outer side of the arc extinguishing region along the first direction, the third plate (313) is correspondingly covered on one end, away from the arcing region (104) of the arcing region (103), of the third plate (313) is bent at one end, away from the second plate (312), of the third plate (313) to form a wiring part (314).