CN117133601B

CN117133601B - Circuit breaker

Info

Publication number: CN117133601B
Application number: CN202210545793.XA
Authority: CN
Inventors: 杨安; 卢科军; 周长青; 付浩
Original assignee: Shanghai Chint Intelligent Technology Co Ltd
Current assignee: Shanghai Chint Intelligent Technology Co Ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2024-06-14
Anticipated expiration: 2042-05-19
Also published as: CN117133601A

Abstract

The invention relates to the field of piezoelectric devices, in particular to a circuit breaker, which comprises a shell, a first circuit and a second circuit, wherein the first circuit and the second circuit are respectively arranged in the shell; at least one of the two ends of the shell in the length direction is provided with a breaker wiring terminal; the first circuit comprises a first operation and contact system, wherein the first operation and contact system comprises a first operation mechanism, a first moving contact and a first fixed contact matched with the first moving contact, which are in driving connection; the second circuit comprises a second operation and contact system, wherein the second operation and contact system comprises a second operation mechanism and a second moving contact which are in driving connection, and a second fixed contact matched with the second moving contact; the first operation and contact system and the second operation and contact system are arranged along the length direction of the shell and are positioned between two ends of the shell in the length direction; the circuit breaker is reasonable in internal layout and good in insulating performance.

Description

Circuit breaker

Technical Field

The invention relates to the field of piezoelectric devices, in particular to a circuit breaker.

Background

The plug-in circuit breaker, due to the limitations of the application, has a different requirement for its internal structural design and layout from that of the conventional circuit breaker (e.g., molded case circuit breaker, frame circuit breaker, etc.).

Existing plug-in circuit breakers, in particular circuit breakers provided with two circuit structures (for example of the 1p+n type, with 1L-pole circuit and 1N-pole circuit), have the following drawbacks:

1. The contact systems and the operating mechanisms of the two circuit structures are generally laid out in a mode of being stacked along the thickness direction of the circuit breaker shell, the distance between the two contact systems is similar, the requirement on insulation performance is high, and the thickness specification of the circuit breaker is increased due to the stacked arrangement of the two contact systems.

2. In order to realize synchronous opening or closing of two circuit structures, the two circuit structures share an operating mechanism or are provided with two independent operating mechanisms, and the operating mechanism has a complex structure and occupies a large space.

3. The N-pole circuit lacks an arc striking structure, or the arc striking structure is complex.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a circuit breaker which is reasonable in internal layout and good in insulating performance.

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

A circuit breaker includes a housing, a first circuit and a second circuit disposed within the housing, respectively; at least one of the two ends of the shell in the length direction is provided with a breaker wiring terminal; the first circuit comprises a first operation and contact system, wherein the first operation and contact system comprises a first operation mechanism, a first moving contact and a first fixed contact matched with the first moving contact, which are in driving connection; the second circuit comprises a second operation and contact system, wherein the second operation and contact system comprises a second operation mechanism and a second moving contact which are in driving connection, and a second fixed contact matched with the second moving contact; the first operation and contact system and the second operation and contact system are arranged along the length direction of the shell and are positioned between two ends of the shell in the length direction.

Preferably, the wire inlet end and the wire outlet end of the first circuit and the second circuit are circuit breaker wire terminals, the wire inlet end of the first circuit and the wire inlet end of the second circuit are circuit breaker wire inlet ends, and the wire outlet end of the first circuit and the wire outlet end of the second circuit are circuit breaker wire outlet ends; the wire inlet end of the first circuit comprises a first wire inlet end and a second wire inlet end, and the first wire inlet end and the second wire inlet end are arranged at intervals side by side along the width direction of the shell; the wire outlet end of the first circuit comprises a first wire outlet end and a second wire outlet end, and the first wire outlet end and the second wire outlet end are arranged at intervals side by side along the thickness direction of the shell.

Preferably, the circuit breaker further comprises an operating member disposed at one end of the housing in the longitudinal direction, the operating member being in driving connection with the first operating mechanism, the first operating mechanism being in driving connection with the second operating mechanism.

Preferably, the circuit breaker further comprises an electric operating mechanism and a circuit board, wherein the electric operating mechanism is in driving connection with the first operating mechanism, the electric operating mechanism, the first operating and contacting system and the second operating and contacting system are sequentially arranged along the length direction of the shell and are positioned between two ends of the shell in the length direction, and the circuit board and the first operating mechanism are arranged in a stacked mode along the thickness direction of the shell.

Preferably, the electric operating mechanism comprises a drive motor and a gear set in driving connection, the gear set comprises a final gear which is in driving fit with the handle member of the first operating mechanism.

Preferably, the circuit breaker further comprises a short-circuit protection mechanism and an arc extinguishing system which are respectively matched with the first operation mechanism, wherein the short-circuit protection mechanism and the arc extinguishing system are arranged side by side along the width direction of the shell and are positioned between the first operation and contact system and the second operation and contact system.

Preferably, the circuit breaker further comprises an overload protection mechanism matched with the first operation mechanism, the overload protection mechanism and the first operation and contact system are arranged side by side along the width direction of the shell, the short-circuit protection mechanism and the first operation and contact system are located on one side of the width direction of the shell, and the overload protection mechanism and the arc extinguishing system are located on the other side of the width direction of the shell.

Preferably, the housing includes a first arc discharge passage, one end of the first arc discharge passage is communicated with an outlet of the arc extinguishing system, the other end of the first arc discharge passage is communicated with the outside, and the first arc discharge passage and the second operation and contact system are arranged side by side along a width direction of the housing.

Preferably, the circuit breaker further comprises a current sampling device, the overload protection mechanism, the arc extinguishing system and the current sampling device are sequentially arranged along the length direction of the shell, and the current sampling device and the overload protection mechanism are respectively located on two sides of the arc extinguishing system.

Preferably, the second moving contact is electrically connected with a second wire inlet end of the second circuit through a second flexible connection and a second wiring board which are sequentially connected, the second wiring board and the second fixed contact are oppositely enclosed to form a second arc discharge channel, one end of the second arc discharge channel is opposite to the second operation and contact system, and the other end of the second arc discharge channel is opposite to the second wire inlet end.

Preferably, the circuit breaker further comprises a locking mechanism in driving fit with the operating member, the locking mechanism and the operating member are arranged side by side along the width direction of the shell, and the circuit breaker outlet end and the locking mechanism are respectively positioned at two sides of the operating member.

Compared with the existing circuit breaker, the thickness specification of the circuit breaker is reduced, the insulation distance and creepage clearance between the first circuit and the second circuit are increased, the insulation between the circuit breakers is improved, and the wiring process in the circuit breaker is simplified; the first operation and contact system of the first circuit and the second operation and contact system of the second circuit are respectively provided with breakpoints, so that the isolation function is realized, and the safety is improved.

Drawings

Fig. 1 is a schematic view of a housing structure of a circuit breaker of the present invention;

Fig. 2 is a schematic view of the internal structure of the circuit breaker of the present invention;

FIG. 3 is a schematic view of the construction of a first and second operating and contacting system of the present invention;

fig. 4 is a schematic view of the connection of the first lever, linkage and second lever of the present invention.

Detailed Description

Specific embodiments of the circuit breaker of the present invention are further described below with reference to the examples shown in the drawings. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-4, is one embodiment of the circuit breaker of the present invention.

As shown in fig. 1 to 4, the circuit breaker of the present embodiment includes a housing 15, and a first circuit and a second circuit respectively provided in the housing 15; at least one of the two ends of the shell 15 in the length direction is provided with a breaker terminal; the first circuit comprises a first operation and contact system 6, wherein the first operation and contact system 6 comprises a first operation mechanism and a first moving contact 6-8 which are in driving connection, and a first fixed contact 6-9 matched with the first moving contact 6-8; the second circuit comprises a second operation and contact system 11, wherein the second operation and contact system 11 comprises a second operation mechanism and a second moving contact 11-1 which are in driving connection, and a second fixed contact 11-3 matched with the second moving contact 11-1; the first operating and contact system 6 and the second operating and contact system 11 are disposed at intervals along the length direction of the housing 15 and between both ends of the housing 15 in the length direction.

As shown in fig. 2-3, the first moving contact 6-8 and the first fixed contact 6-9 form a first contact system, and the second moving contact 11-1 and the second fixed contact 11-3 form a second contact system.

As shown in fig. 1-2, the wire inlet end and the wire outlet end of the first circuit and the second circuit are circuit breaker wire terminals, the wire inlet end of the first circuit and the wire inlet end of the second circuit are circuit breaker wire inlet ends, and the wire outlet end of the first circuit and the wire outlet end of the second circuit are circuit breaker wire outlet ends; the wire inlet ends of the first circuit and the second circuit are a first wire inlet end 9 and a second wire inlet end 10 respectively, and the first wire inlet end 9 and the second wire inlet end 10 are arranged at one end of the shell 15 in the length direction and are arranged at intervals side by side along the width direction of the shell 15; the wire outlet ends of the first circuit and the second circuit are a first wire outlet end 14a and a second wire outlet end 14b, respectively, and the first wire outlet end 14a and the second wire outlet end 14b are arranged at the other end of the housing 15 in the length direction and are arranged at intervals side by side along the thickness direction of the housing 15.

As other embodiments, only one of the two ends of the housing 15 in the length direction is provided with a breaker terminal; that is, the breaker inlet terminal and the short-circuited outlet terminal are both provided at one end in the length direction of the housing 15.

In the circuit breaker of this embodiment, the up-down direction of fig. 1-2 is taken as the length direction of the housing 15, the left-right direction of fig. 1-2 is taken as the width direction of the housing 15, and the side of fig. 1-2 facing the reader facing away from the reader is taken as the thickness direction of the housing 15.

The circuit breaker of this embodiment is preferably a 1p+n type circuit breaker, the first circuit is preferably an L-pole circuit, and the second circuit is preferably an N-pole circuit. Of course, as other embodiments, the first circuit and the second circuit may be both L-pole circuits.

Compared with the existing circuit breaker, the thickness specification of the circuit breaker is reduced, the insulation distance and creepage clearance between the first circuit and the second circuit are increased, the insulation between the circuit breakers is improved, and the internal wiring process of the circuit breaker is simplified; the first operation and contact system of the first circuit and the second operation and contact system of the second circuit are respectively provided with breakpoints, so that the isolation function is realized, and the safety is improved.

As shown in fig. 1-2, the circuit breaker of the present embodiment further includes an operating member 1, the operating member 1 is disposed at one end of the housing 15 in the length direction, the operating member 1 is in driving connection with a first operating mechanism, the first operating mechanism is in driving connection with a second operating mechanism, the first operating mechanism is driven by the operating member 1, and then the second operating mechanism is driven by the first operating mechanism to act.

In the circuit breaker of the present embodiment, the operating member 1 is preferably a push button slidably inserted in the housing 15. Further, as shown in fig. 2, the buttons and the outlet end of the circuit breaker are arranged side by side along the width direction of the housing 15, and the operating member 1, the first operating and contacting system 6 and the second operating and contacting system 11 are sequentially arranged along the length direction of the housing 15, that is, sequentially arranged along one direction in the housing 15, and the distances between the first operating and contacting system 6 and the second operating and contacting system 11 and the operating member 1 are different, unlike the first operating and contacting system 6 and the second operating and contacting system 11 in the prior art, which are side by side along the width direction of the housing 15 and have the same distance with the operating member 1.

As a further embodiment, the operating element 1 can also use a handle which is arranged to rotate in order to actuate the first operating mechanism.

As shown in fig. 2-4, the first operating mechanism is in driving connection with the second operating mechanism through the linkage piece 16, and the transmission mode of the first operating mechanism and the second operating mechanism is simple and reliable, so that synchronous actions of two pairs of contact systems are ensured. Further, the first operating mechanism comprises a first lever 6-2 which is rotatably arranged on the shell 15 and is in driving connection with the first moving contact 6-8, the second operating mechanism comprises a second lever 11-0 which is rotatably arranged on the shell 15 and is in driving connection with the second moving contact 11-1, the first lever 6-2 is in driving connection with the second lever 11-0 through a linkage piece 16, the first lever 6-2 and the second lever 11-0 synchronously rotate, the first lever 6-2 rotates to drive the first moving contact 6-8 to be closed or opened with the first fixed contact 6-9, and the second lever 11-0 rotates to drive the second moving contact 11-1 to be closed or opened with the second fixed contact 11-3.

As shown in fig. 2-3, the rotation directions of the first lever 6-2 and the second lever 11-0 are maintained opposite, that is, the rotation direction when the first lever 6-2 rotates to drive the first contact system to be closed or opened is opposite to the rotation direction when the second lever 11-0 rotates to drive the second contact system to be closed or opened. Specifically, as shown in fig. 2-3, the first lever 6-2 rotates clockwise or counterclockwise to drive the first contact system to open or close; the second lever 11-0 is rotated counterclockwise or clockwise to drive the second contact system to be opened or closed. Of course, the arrangement positions of the second moving contact 11-1 and the second fixed contact 11-3 are exchanged, or the positions of the first moving contact 6-8 and the first fixed contact 6-9 are exchanged, and the rotation directions of the first lever 6-2 and the second lever 11-0 may be set to be the same.

As shown in fig. 4, the first lever 6-2 and the second lever 11-0 are rotatably connected to both ends of the link 16, respectively. Specifically, as shown in fig. 4, the linkage 16 includes a first linkage transmission portion 16-1, a linkage transmission plate 16-0, and a second linkage transmission portion 16-2 that are sequentially connected; the first lever 6-2 includes a first lever connecting portion 6-2-0, the first lever connecting portion 6-2-0 is rotatably connected with the first linkage transmission portion 16-1, and the rotation axes of the first lever connecting portion 6-2-0 and the first linkage transmission portion 16-1 (i.e. the rotation connecting axes of the first lever connecting portion and the first linkage transmission portion) are arranged at intervals in parallel with the rotation axis of the first lever 6-2; the second lever 11-0 includes a second lever connecting portion 11-0-0, the second lever connecting portion 11-0-0 is rotatably connected to the second linkage transmission portion 16-1, and the rotation axes of the second lever connecting portion 11-0-2 and the second linkage transmission portion 16-2 (i.e., the rotation connecting axes of the two) are disposed at a parallel interval with the rotation axis of the second lever 11-0. Further, the first linkage transmission part 16-1 and the second linkage transmission part 16-2 are both located on the same side of the linkage transmission plate 16-0, and two ends of the linkage transmission plate 16-0 are respectively stacked with the first lever 6-2 and the second lever 11-0 along the thickness direction of the housing 15, so that the thickness space of the housing 15 is further saved.

Preferably, as shown in fig. 4, the first linkage transmission part 16-1 and the first lever connection part 6-2-0 are rotatably connected through a shaft hole, that is, one of the two is provided with a jack, and the other is rotatably inserted into the jack as a shaft; or the two jacks are arranged, and a shaft is used for respectively and rotatably inserting the two jacks; the second linkage piece transmission part 16-2 and the second lever connection part 11-0-0 are rotationally connected in a shaft hole mode, namely, one of the two transmission parts is provided with a jack, and the other transmission part is inserted into the jack as a shaft rotation; or both are provided with jacks, and a shaft is used for respectively and rotatably inserting the jacks into the two jacks.

As shown in fig. 2-3, one embodiment of the first operating mechanism is as follows.

As shown in fig. 2-3, the first operating mechanism comprises a handle member 6-1, a handle reset member 6-0, a first lever 6-2, a second connecting rod 6-3, a lever reset member 6-4, a locking member 6-5, a buckle member 6-6 and a buckle reset member 6-7, wherein the handle member 6-1 and the first lever 6-2 are respectively rotatably arranged on a shell 15, the handle member 6-1 is connected with a button (i.e. the operating member 1) through the first connecting rod 3 (the first connecting rod 3 is preferably a U-shaped connecting rod, two ends of the first connecting rod are respectively rotatably connected with the handle member 6-1 and the button), and is connected with the locking member 6-5 through the second connecting rod 6-3 (the second connecting rod 6-3 is preferably a U-shaped connecting rod, two ends of the second connecting rod are respectively rotatably connected with the handle member 6-1 and the locking member 6-5), the handle reset piece 6-0 applies force to the handle piece 6-1 to enable the handle piece 6-1 to have a trend of rotating towards a breaking position, namely when the breaker breaks a brake or jumps a buckle, the handle reset piece 6-0 drives the handle piece 6-1 to rotate to the breaking position, the locking piece 6-5 and the jump buckle piece 6-6 are respectively arranged on the first lever 6-2 in a rotating mode and are in lap joint, the lever reset piece 6-4 applies force to the first lever 6-2 to enable the first movable contact 6-8 to be driven to be disconnected with the first fixed contact 6-9, the jump buckle reset piece 6-7 applies force to the jump buckle piece 6-6 to enable the jump buckle piece 6-5 to be kept in lap joint, the first lever 6-2 is provided with a first lever connecting part 6-2-0, the first lever connecting part 6-2-0 is arranged in parallel with the rotating shaft of the first lever 6-2 at intervals. Further, the handle reset member 6-4 is preferably a handle reset torsion spring, the handle reset torsion spring is coaxially arranged with the handle member 6-1 (the spiral body part of the handle reset torsion spring is preferably sleeved on the rotating shaft of the handle member 6-1), and two ends of the handle reset torsion spring are respectively matched with the handle member 6-1 and the shell 15; the lever resetting piece 6-4 is preferably a lever pressure spring, is arranged between the second lever 6-2 and the shell 15, and two ends of the lever resetting piece are respectively in limit fit with the second lever and the shell; the trip reset piece 6-7 is a trip reset torsion spring, the trip reset torsion spring and the trip piece 6-6 are coaxially arranged (the spiral body part of the trip reset torsion spring is preferably sleeved on the rotating shaft of the trip piece 6-6), and two ends of the trip reset torsion spring are respectively matched with the trip piece 6-6 and the second lever 6-2.

As other embodiments, for example, when the first operating mechanism is driven by the handle, the first operating mechanism may be provided without the handle member 6-1 and the handle resetting member 6-0, and the handle may be connected with the latch member 6-5 by the link to drive the first lever 6-2.

As shown in fig. 2-3, one embodiment of the second operating mechanism is as follows.

As shown in fig. 2-3, the second operating mechanism includes a second lever 11-0 and a second moving contact spring 11-2, the second lever 11-0 is rotatably disposed on the housing 15, the second moving contact 11-1 is disposed on the second lever 11-0 and rotates synchronously therewith and can rotate relative to the second lever 11-0, one end of the second moving contact spring is fixed (preferably fixed on the housing 15), and the other end is connected to the second moving contact 11-1; when the second moving contact 11-1 is closed with the second fixed contact 11-3, the second moving contact spring 11-2 enables the second moving contact 11-3 to press the second fixed contact 11-3; after the second moving contact 11-1 is separated from the second fixed contact 11-3, the second moving contact spring 11-2 drives the second moving contact 11-1 to swing in a direction away from the second fixed contact 11-3.

As shown in fig. 2-3, the second lever 11-0 is rotatably disposed around a second lever shaft, a second moving contact hole is disposed in the middle of the second moving contact 11-1, the second moving contact 11-1 is movably sleeved on the second lever shaft through the second moving contact hole, the inner diameter of the second moving contact hole is larger than that of the second lever shaft, one end, far away from the moving contact, of the second moving contact 11-1 is rotatably disposed on the second lever 11-0 around the second moving contact shaft, the second moving contact spring 11-2 is a tension spring, one end of the second moving contact is connected with the second moving contact 11-1 through the second moving contact hole, and the other end of the second moving contact spring is fixedly disposed. Specifically, before the second moving contact 11-1 contacts the second fixed contact 11-3, the second moving contact 11-1 rotates around the second lever shaft under the driving of the second lever 11-0, the second moving contact spring 11-2 makes the side wall of the second moving contact hole in limit fit with the second lever shaft so that the second moving contact 11-1 and the second lever 11-0 keep relatively static, and the second moving contact spring 11-2 applies an acting force to the second moving contact 11-1 to make the second lever 11-0 have a tendency to rotate in a direction away from the second fixed contact 11-3; the second moving contact 11-1 contacts with the second fixed contact 11-3, and the second lever 11-0 continues to rotate towards the closing position, so that the second moving contact 11-1 rotates relative to the second lever 11-0 by taking the second fixed contact 11-3 as a fulcrum, and at the moment, the second moving contact spring 11-2 applies acting force to the second moving contact 11-1 to enable the second moving contact 11-1 to press the second fixed contact 11-3.

As shown in fig. 1-2, the circuit breaker of the present embodiment further includes a locking mechanism 2, the locking mechanism 2 and the operating member 1 (the operating member 1 is preferably a button) are disposed side by side along the width direction of the housing 15, and the circuit breaker outlet terminal and the locking mechanism 2 are respectively located at both sides of the operating member 1. The locking mechanism 2 comprises a locking part, when the circuit breaker is switched on, the operating piece 1 drives the locking mechanism 2 to act so that the locking part protrudes out of the shell 15, thereby avoiding that the circuit breaker is installed in a circuit breaker installation position (such as a power distribution cabinet, a power distribution box and the like) in a switching-on state, and avoiding that the circuit breaker is pulled out of the circuit breaker installation position in the switching-on state, and improving the electricity safety; the locking mechanism 2 can be realized by the prior art and is not unfolded here.

As shown in fig. 2, the circuit breaker of the present embodiment further includes an electric operating mechanism 4 and a circuit board 13 which are drivingly connected to the first operating mechanism, the electric operating mechanism 4, the first operating and contacting system 6 and the second operating and contacting system 11 being disposed in this order along the length direction of the housing 15 and being located between both ends in the length direction of the housing 15, the circuit board 13 and the first operating mechanism being disposed in a stacked manner along the thickness direction of the housing 15. Further, the electrically operated mechanism 4 is located between the circuit breaker inlet and the first operating and contact system 6.

As shown in fig. 2, the electric operating mechanism 4 comprises a drive motor and a gear set drivingly connected thereto, the gear set comprising a final gear which is drivingly engaged with the handle member 6-1 of the first operating mechanism. The electric actuating mechanism 4 can be realized by means of the prior art and will not be described here.

As shown in fig. 2, the circuit breaker of the present embodiment further includes a short-circuit protection mechanism 12 and an arc extinguishing system 7 respectively matched with the first operating mechanism, when the short-circuit protection mechanism 12 has a short-circuit fault in the circuit, the trip member 6-6 is driven to rotate to release the overlap fit with the latch member 6-5, the first operating mechanism is triggered to trip the trip, the first operating mechanism synchronously drives the second operating mechanism to trip, the short-circuit protection mechanism 12 and the arc extinguishing system 7 are arranged side by side along the width direction of the housing 15 and are located between the first operating and contact system 6 and the second operating and contact system 11 so as to enable the two to be arranged at intervals.

As shown in fig. 2, the circuit breaker of the present embodiment further includes an overload protection mechanism 5 that is matched with the first operating mechanism, and when the overload protection mechanism 5 fails in an overload state, the overload protection mechanism 5 drives the trip member 6-6 to rotate to release the overlap fit with the trip member 6-5, so as to trigger the first operating mechanism to trip the trip, and the overload protection mechanism 5 and the first operating and contact system 6 are arranged side by side along the width direction of the housing 15. Further, the short-circuit protection mechanism 12 and the first operation and contact system 6 are located at one side of the housing 15 in the width direction, and the overload protection mechanism 5 and the arc extinguishing system 7 are located at the other side of the housing 15 in the width direction.

As shown in fig. 2, the short-circuit protection mechanism 12 is preferably an electromagnetic release, the first moving contact 6-8, the short-circuit protection mechanism 12 and the first wire inlet end 9 are electrically connected in sequence, the overload protection mechanism 5 comprises a bimetallic strip, the first fixed contact 6-9, the overload protection mechanism 5 and the first wire outlet end 14a are electrically connected in sequence, and the arc extinguishing system 7 comprises an arc extinguishing chamber matched with the first contact system.

As shown in fig. 2, the housing 15 includes a first arc discharge passage, one end of which communicates with an outlet of the arc extinguishing system 7, and the other end of which communicates with the outside; the first arc-shaped channels are arranged side by side with the second operating and contacting system 11 in the width direction of the housing 15. As shown in fig. 2-3, the second movable contact 11-1 of the present embodiment is electrically connected to the second wire inlet 10 of the second circuit through a second flexible connection 19 and a second wiring board 17 that are sequentially connected. Further, the second stationary contact 11-3 includes a second stationary conductive plate and a second stationary contact 11-3-2, wherein one end of the second stationary conductive plate is provided with the second stationary contact 11-3-2, and the other end is connected with the second wire outlet end 14 b; the second wiring board 17 comprises a second wiring board head section 17-0 arranged at one end of the second wiring board, the second movable contact 11-1 is connected with the second wiring board head section 17-0 through a second flexible connection 19, the other end of the second wiring board 17 is connected with the second wire inlet end 10, the second wiring board head section 17-0 is arranged opposite to the second static conductive board, and one end of the second movable contact 11-1 provided with the movable contact swings between the second static conductive board and the second wiring board head section 17-0; the structural design reduces the loop resistance of the second circuit and increases the movable space of the second movable contact. Further, as shown in fig. 3, the second static conductive plate includes a first static conductive plate portion 11-3-0 and a second static conductive plate portion 11-3-1, one end of the second static conductive plate portion 11-3-1 is connected to the second wire outlet end 14b, the other end is connected to the first static conductive plate portion 11-3-0 in a bending manner, the second static contact 11-3-2 is disposed at a free end of the first static conductive plate portion 11-3-0, the first static conductive plate portion 11-3-0 and the second wire connecting plate 17 are relatively spaced to form a second arc discharge channel, one end of the second arc discharge channel is opposite to one end of the second static contact 11-1 provided with a movable contact, the other end of the second arc discharge channel is opposite to the second wire inlet end 10, the second wire connecting plate 17 has an arc striking function in addition to have a through-flow function, the arc is led away from the second movable contact 11-1, burning loss of the second movable contact 11-1 is avoided or significantly reduced, and the service life of the second movable contact 11-1 is prolonged; when the second moving contact 11-1 is closed with the second fixed contact 11-3, the direction of the current flowing in the second moving contact 11-1 and the first part 11-3-0 of the static conductive plate is the same.

As shown in fig. 2-3, the first static conductive plate portion 11-3-0 includes a static conductive plate first section 11-3-0-0 and a static conductive plate middle section 11-3-0-1, the static conductive plate first section 11-3-0-0, the static conductive plate middle section 11-3-0-1 and the static conductive plate second portion 11-3-1 are sequentially connected, the second static contact 11-3-2 is disposed on the static conductive plate first section 11-3-0-0, the static conductive plate first section 11-3-0-0 is bent towards the static conductive plate second portion 11-3-1 relative to the static conductive plate middle section 11-3-0-1, the static conductive plate first section 11-3-0-0 and the static conductive plate second portion 11-3-1 are preferably disposed in parallel, the static conductive plate is preferably in a fishhook structure, and the length of the static conductive plate second portion is much longer than that of the static conductive plate first portion.

As shown in fig. 2-3, the second wiring board 17 includes a second wiring board first section 17-0, a second wiring board neck section 17-1, a second wiring board web section 17-2 and a second wiring board tail section 17-3 which are sequentially connected, the second wiring board first section 17-0 is relatively parallel to the static conductive board first section 11-3-0, one end of the second movable contact 11-1 provided with a movable contact is interposed between the second wiring board first section 17-0 and the static conductive board first section 11-3-0-0, the second wiring board web section 17-2 is relatively parallel to the static conductive board middle section 11-3-0-1, and the second wiring board tail section 17-3 is also connected to the second wire inlet end 10. Further, the second terminal plate neck section 17-1 is bent towards the side where the second fixed contact 11-3 is located relative to the first terminal plate section 17-0, the second terminal plate neck section 17-1 and the second terminal plate tail section 17-3 are bent towards the same side of the second terminal plate web section 17-2, and the second fixed contact 11-3 is located at the other side of the second terminal plate web section 17-2.

As shown in fig. 2, the circuit breaker of the present embodiment further includes a current sampling device 8, and the overload protection mechanism 5, the arc extinguishing system 7 and the current sampling device 8 are sequentially disposed along the length direction of the housing 15, and the current sampling device 8 and the overload protection mechanism 5 are respectively located at two sides of the arc extinguishing system 7. Further, the current sampling device 8 is located between the arc extinguishing system 7 and the incoming line end of the circuit breaker. Further, the current sampling device 8 is located between the first arc discharge channel and the incoming line end of the circuit breaker. Further, the current sampling device 8 is located between the first arc discharge channel and the first wire inlet end 9, and the current sampling device 8 and the second arc discharge channel are arranged side by side along the width direction of the casing 15.

As shown in fig. 2, the current sampling apparatus 8 includes a current transformer, the short-circuit protection mechanism 12 is connected to the first terminal 9 through a first wiring board 19, the first wiring board 19 passes between the first operation and contact system 11 and the first arc discharge channel (the first wiring board 19 is preferably embedded in a first wiring board card slot in the housing 15), and the current transformer is sleeved on the first wiring board 19.

Specifically, as shown in fig. 1-2, in the circuit breaker of this embodiment: the first wire inlet end 14a and the second wire inlet end 14b are arranged at the upper end of the shell 15 at intervals side by side along the thickness direction of the shell 15, and the first wire outlet end 9 and the second wire outlet end 10 are arranged at the lower end of the shell 15 at intervals side by side from right to left; the circuit breaker inlet terminal, the button (i.e. the operating member 1) and the locking mechanism 2 are arranged at the upper end of the shell 15 side by side from left to right; the electric operating mechanism 4, the first operating and contact system 6 and the second operating and contact system 11 are sequentially arranged between the circuit breaker wire inlet end and the circuit breaker wire outlet end from top to bottom; the short-circuit protection mechanism 12 and the arc extinguishing system 7 are arranged side by side left and right and are positioned between the first operation and contact system 6 and the second operation and contact system 11, and the first operation and contact system 6 and the overload protection mechanism 5 are arranged side by side left and right; the second operation and contact system 11 and the first arc discharge channel are arranged side by side from left to right, and the current sampling device 8 is located between the first arc discharge channel and the first wire inlet end 9 and is arranged side by side with the second arc discharge channel from right to left. The internal layout of the circuit breaker of the embodiment is reasonable and compact, so that the insulation performance of the interior of the shell 15 is guaranteed, the internal space is saved, and the size specification of the circuit breaker is reduced.

As other embodiments, for example, when the second circuit is an L-pole circuit, the second operating mechanism may further include a second latch member and a second jump-latch member, where the second latch member and the second jump-latch member are respectively rotatably mounted on the second lever 11-0 and are in lap joint, and the first operating mechanism is connected to the second latch member through the linkage member 16; and a second short-circuit protection mechanism and a second overload protection mechanism are arranged corresponding to the second jump fastener and are used for contacting the lap joint of the second lock fastener and the second jump fastener to trigger the second operating mechanism to release the brake. Further, as other embodiments, the breaker inlet terminal and the breaker outlet terminal may be located at one end of the housing 15 in the length direction, and a button or a handle (i.e., the operating member 1) is provided at the other end of the housing 15 in the length direction.

It should be noted that, in the description of the present invention, 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 invention. 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 invention in connection with the preferred embodiments, and it is not intended that the invention 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 invention, and these should be considered to be within the scope of the invention.

Claims

1. A circuit breaker comprising a housing (15), a first circuit and a second circuit respectively arranged within the housing (15); at least one of the two ends of the shell (15) in the length direction is provided with a breaker wiring terminal; the first circuit comprises a first operation and contact system (6), wherein the first operation and contact system (6) comprises a first operation mechanism and a first moving contact (6-8) which are in driving connection, and a first fixed contact (6-9) matched with the first moving contact (6-8); the second circuit comprises a second operation and contact system (11), wherein the second operation and contact system (11) comprises a second operation mechanism and a second movable contact (11-1) which are in driving connection, and a second fixed contact (11-3) matched with the second movable contact (11-1); the method is characterized in that: the first operation and contact system (6) and the second operation and contact system (11) are sequentially arranged along the length direction of the shell (15) and are positioned between two ends of the shell (15) in the length direction; the circuit breaker further comprises an operating piece (1), wherein the operating piece (1) is in driving connection with the first operating mechanism, and the first operating mechanism is in driving connection with the second operating mechanism.

2. The circuit breaker according to claim 1, characterized in that: the wire inlet end and the wire outlet end of the first circuit and the second circuit are circuit breaker wiring terminals, the wire inlet end of the first circuit and the wire inlet end of the second circuit are circuit breaker wire inlet ends, and the wire outlet end of the first circuit and the wire outlet end of the second circuit are circuit breaker wire outlet ends; the wire inlet end of the first circuit comprises a first wire inlet end (9) and a second wire inlet end (10), and the first wire inlet end (9) and the second wire inlet end (10) are arranged at intervals side by side along the width direction of the shell (15); the wire outlet end of the first circuit comprises a first wire outlet end (14 a) and a second wire outlet end (14 b), and the first wire outlet end (14 a) and the second wire outlet end (14 b) are arranged at intervals side by side along the thickness direction of the shell (15).

3. The circuit breaker according to claim 1, characterized in that: the operating member (1) is provided at one end in the longitudinal direction of the housing (15).

4. The circuit breaker according to claim 1, characterized in that: the circuit breaker further comprises an electric operating mechanism (4) and a circuit board (13) which are connected with the first operating mechanism in a driving mode, wherein the electric operating mechanism (4), the first operating and contacting system (6) and the second operating and contacting system (11) are sequentially arranged along the length direction of the shell (15) and are located between two ends of the shell (15) in the length direction, and the circuit board (13) and the first operating mechanism are arranged in a stacked mode along the thickness direction of the shell (15).

5. The circuit breaker of claim 4, wherein: the electric operating mechanism (4) comprises a driving motor and a gear set which are in driving connection, wherein the gear set comprises a final gear which is in driving fit with a handle piece (6-1) of the first operating mechanism.

6. The circuit breaker according to claim 1, characterized in that: the circuit breaker further comprises a short-circuit protection mechanism (12) and an arc extinguishing system (7) which are matched with the first operating mechanism respectively, wherein the short-circuit protection mechanism (12) and the arc extinguishing system (7) are arranged side by side along the width direction of the shell (15) and are positioned between the first operating and contact system (6) and the second operating and contact system (11).

7. The circuit breaker of claim 6, wherein: the circuit breaker further comprises an overload protection mechanism (5) matched with the first operating mechanism, the overload protection mechanism (5) and the first operating and contact system (6) are arranged side by side along the width direction of the shell (15), the short circuit protection mechanism (12) and the first operating and contact system (6) are located on one side of the shell (15) in the width direction, and the overload protection mechanism (5) and the arc extinguishing system (7) are located on the other side of the shell (15) in the width direction.

8. The circuit breaker of claim 7, wherein: the shell (15) comprises a first arc discharge channel, one end of the first arc discharge channel is communicated with an outlet of the arc extinguishing system (7), the other end of the first arc discharge channel is communicated with the outside, and the first arc discharge channel and the second operation and contact system (11) are arranged side by side along the width direction of the shell (15).

9. The circuit breaker of claim 7, wherein: the circuit breaker further comprises a current sampling device (8), wherein the overload protection mechanism (5), the arc extinguishing system (7) and the current sampling device (8) are sequentially arranged along the length direction of the shell (15), and the current sampling device (8) and the overload protection mechanism (5) are respectively positioned at two sides of the arc extinguishing system (7).

10. The circuit breaker according to claim 1, characterized in that: the second movable contact (11-1) is electrically connected with a second wire inlet end (10) of a second circuit through a second flexible connection (19) and a second wiring board (17) which are sequentially connected, the second wiring board (17) and the second fixed contact (11-3) are oppositely surrounded to form a second arc discharge channel, one end of the second arc discharge channel is opposite to the second operation and contact system (11), and the other end of the second arc discharge channel is opposite to the second wire inlet end (10).

11. A circuit breaker according to claim 3, characterized in that: the circuit breaker further comprises a locking mechanism (2) in driving fit with the operating piece (1), the locking mechanism (2) and the operating piece (1) are arranged side by side along the width direction of the shell (15), and the circuit breaker outlet end and the locking mechanism (2) are respectively located on two sides of the operating piece (1).