CN220873494U - Circuit breaker - Google Patents

Abstract

The utility model relates to the field of piezoelectric devices, in particular to a circuit breaker, which comprises a shell, an operating mechanism, a contact system, a first wiring terminal and a second wiring terminal, wherein the operating mechanism is arranged on the shell; the lever mechanism comprises a locking piece and a tripping piece which are respectively pivoted and in snap fit, the tripping piece is driven by external force to rotate, the snap fit with the locking piece is released, and the circuit breaker is tripped and opened; the first wiring terminal, the contact system and the second wiring terminal are sequentially arranged along a first direction d1, and the operating mechanism and the contact system are sequentially arranged along a second direction d 2; the contact system comprises a main contact structure and an auxiliary contact structure which are respectively pivoted and synchronously rotate, and the two groups of auxiliary contact structures are respectively arranged on the two radial sides of the main contact structure, are respectively electrically connected with the first wiring terminal and the second wiring terminal and are synchronously closed or opened with the main contact structure.

Description

Circuit breaker

Technical Field

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

Background

The circuit breaker includes an operating mechanism and a contact system, the operating mechanism driving the contact system to close and open to complete and open the circuit. In the existing circuit breaker, the contact system of the circuit breaker adopts a dynamic and static contact matched implementation mode, and under the background of the increasingly miniaturized development trend of the circuit breaker, the contact system realized by the dynamic and static contact matched operation cannot be greatly improved in a limited space, so that the improvement of the breaking capacity of the circuit breaker is directly influenced. In addition, the internal layout of the existing circuit breaker is staggered and complex, and short circuit risks exist.

Disclosure of utility model

The utility model aims to overcome at least one defect of the prior art and provide a circuit breaker, wherein the circuit breaker is reasonable and compact in internal layout and high in breaking capacity.

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

A circuit breaker includes a housing, an operating mechanism, a contact system, a first terminal and a second terminal disposed within the housing, respectively; the operating mechanism is used for driving the contact system to be closed and opened, and comprises a lever mechanism, wherein the lever mechanism comprises a locking piece and a tripping piece which are respectively pivoted and are in snap fit, the tripping piece is driven by external force to rotate, the snap fit with the locking piece is released, and the circuit breaker is tripped and opened;

The first wiring terminal, the contact system and the second wiring terminal are sequentially arranged along a first direction d1, and the operating mechanism and the contact system are sequentially arranged along a second direction d 2; the contact system comprises a main contact structure and an auxiliary contact structure which are respectively pivoted and synchronously rotate, and the two groups of auxiliary contact structures are respectively arranged on the two radial sides of the main contact structure, are respectively electrically connected with the first wiring terminal and the second wiring terminal and are synchronously closed or opened with the main contact structure.

Further, the circuit breaker further comprises an arc extinguishing system, wherein the arc extinguishing system comprises two groups of arc extinguishing chambers which are respectively arranged at the two radial sides of the main contact structure; the auxiliary contact structure and the main contact structure are oppositely matched with the arc extinguishing chambers; the other group of auxiliary contact structure and main contact structure are matched with the other group of arc extinguishing chambers oppositely.

Further, the rotation axes of the main contact structure and the two groups of auxiliary contact structures are arranged in parallel and are both positioned on the first plane, and the two groups of arc extinguishing chambers are respectively arranged on two sides of the first plane.

Further, the circuit breaker further comprises an overcurrent protection mechanism, wherein the overcurrent protection mechanism is used for driving the tripping piece to rotate to release the snap fit with the locking piece when a short circuit and/or overload fault occurs in a circuit where the circuit breaker is located.

Further, the lever mechanism and the overcurrent protection mechanism are arranged side by side along a first direction d1, and the overcurrent protection mechanism and the contact system are arranged side by side along a second direction d 2.

Further, the shell comprises a first terminal cavity, a main cavity and a second terminal cavity which are sequentially and separately arranged along a first direction d1, and an operation cavity which is separately arranged along a second direction d2 from the main cavity;

The first wiring terminal is arranged in the first terminal cavity, the second wiring terminal is arranged in the second terminal cavity, the contact system and the arc extinguishing system are arranged in the main cavity, and the operating mechanism and the overcurrent protection mechanism are arranged in the operating cavity; the first direction d1 and the second direction d2 are perpendicular to each other.

Further, the shell is also provided with two groups of separation ribs, the two groups of separation ribs are respectively positioned at the two radial sides of the main contact structure, and the two groups of separation ribs and the contact system divide the main cavity into two contact cavities;

The main contact structure comprises a main contact, the auxiliary contact structure comprises an auxiliary contact, and two ends of the main contact are respectively closed or opened with two groups of auxiliary contacts; the two ends of the main contact, the two groups of auxiliary contacts and the two groups of arc extinguishing chambers are respectively arranged in the two contact cavities.

Further, the main contact structure and the auxiliary contact structure synchronously rotate in opposite directions to be closed or synchronously rotate in opposite directions to be opened.

Further, the main contact structure is in transmission connection with the two groups of auxiliary contact structures respectively.

Further, the main contact structure comprises a main gear, and the auxiliary contact structure comprises an auxiliary gear in meshed fit with the main gear.

Further, the two groups of auxiliary contact structures take the rotation center of the main contact structure as a symmetry center and are mutually center symmetry structures.

Further, the two groups of auxiliary contact structures are synchronously and rotatably arranged in the same direction, and the auxiliary contact structures and the main contact structures are synchronously and reversely rotatably arranged.

Further, the operating mechanism also comprises a handle and a front connecting rod which are pivotally arranged on the shell, the handle is in transmission connection with the lever mechanism through the front connecting rod, and the lever mechanism is in transmission connection with the main contact structure or any auxiliary contact structure.

Further, the operating mechanism further comprises a rear connecting rod, and the lever mechanism is in transmission connection with the main contact structure or any pair of contact structures through the rear connecting rod.

Further, the lever mechanism further comprises a rotating plate which is pivoted on the shell, the locking piece and the releasing piece are respectively pivoted on the rotating plate, and the rotating plate is in transmission connection with the main contact structure or any pair of contact structures.

According to the circuit breaker, the main contact structure and the auxiliary contact structure of the contact system are pivoted, the circuit breaker is provided with double break points, the main contact structure and the auxiliary contact structure rotate by a small angle, a large opening distance between the main contact structure and the auxiliary contact structure can be realized, and the breaking speed of the contact system is higher, so that the breaking capacity of the contact system can be remarkably improved; moreover, the circuit breaker is reasonable in internal layout, the whole specification volume of the circuit breaker is effectively controlled, and the internal circuit connection structure is simplified, so that the internal insulation performance of the circuit breaker is ensured.

In addition, operating device and contact system set up respectively in different spaces, have increased insulating clearance and creepage distance between operating device and the contact system, have guaranteed operating personnel's personal safety.

In addition, two sets of vice contact structure's axis of rotation is located main contact structure's axis of rotation both sides respectively and sets up rather than parallel interval, and the three all is located first plane, is favorable to the insulating clearance and the creepage distance between two sets of vice contact structure of increase in the furthest, improves insulating properties.

In addition, the two groups of auxiliary contact structures are mutually in a central symmetrical structure, so that the number of parts is reduced.

Drawings

FIG. 1 is a schematic view of the main contact structure of the present utility model in two views;

FIG. 2 is an exploded view of the primary contact structure of the present utility model at two viewing angles;

FIG. 3 is a schematic view of the structure of the support base of the present utility model;

FIG. 4 is a schematic view of the structure of the secondary contact structure of the present utility model;

FIG. 5 is a schematic cross-sectional view of a secondary contact structure of the present utility model;

FIG. 6 is a schematic structural view of a secondary support of the present utility model;

FIG. 7 is a schematic view of the structure of the secondary contact of the present utility model;

Fig. 8.1 is a schematic structural diagram of the switching device in the off state according to the present utility model;

fig. 8.2 is a schematic structural diagram of the switching device in the on state according to the present utility model.

Description of the reference numerals

1, A shell; 1-0 main cavity; 1-1a first terminal cavity; 1-2 second terminal cavities; 1-3 separating ribs; 1-4 operating chambers;

2 a main contact structure; 21 main contacts; 214 positioning grooves; 23 primary support; 231 a support base; 2311 support seat positioning protrusions; 2312 plug holes; 2313 a support seat rotating shaft; 232 support the cover; 2321 support the cover positioning tab; 2322 plug-in posts; 2323 support the lid spindle; 233 sector gear; 234 a main contact receptacle; 237 extension;

3 pairs of contact structures; 31 pairs of contacts; 310 inner sections of the auxiliary contacts; 311 outer sections of the auxiliary contacts; 310-311 auxiliary contact step surfaces; 312 auxiliary contact limit protrusions; 31a first secondary contact; 31b second secondary contacts; 32 pairs of supports; 320 secondary contact receptacles; 322 pinion gears; 33 pairs of springs; 325 pairs of contact positioning surfaces; 326 limit part; 32a first secondary support; 32b a second secondary support;

5a first connecting terminal;

6a second connection terminal;

7, a handle;

8, a transmission connecting rod;

9 an overcurrent protection mechanism;

10 front connecting rod;

11 lever mechanism; 11-1 a rotating plate; 11-2 locking piece; 11-3, releasing the fastener;

12 rear connecting rod;

51a first conductor;

61 a second conductor.

Detailed Description

Specific embodiments of the switching device according to the present utility model will be further described below with reference to examples shown in the drawings. The switching device of the present utility model is not limited to the description of the following embodiments.

As shown in fig. 8.1-8.2, the switching device of the utility model comprises a shell 1, and a first wiring terminal 5, a contact system and a second wiring terminal 6 which are sequentially connected in series; the contact system is closed and opened to conduct and break the circuit of the switching device, and the first wiring terminal 5 and the second wiring terminal 6 are used for connecting the switching device into the corresponding circuit.

As shown in fig. 1-8.2, is one embodiment of the contact system.

As shown in fig. 8.1-8.2, the contact system comprises a main contact structure 2 and an auxiliary contact structure 3 which are respectively pivoted and synchronously rotated, wherein the two groups of auxiliary contact structures 3 are respectively arranged at two radial sides of the main contact structure 2 and synchronously closed or opened with the main contact structure 2, and when the two groups of auxiliary contact structures 3 are closed with the main contact structure 2, the three groups of auxiliary contact structures are sequentially connected in series. Further, the main contact structure 2 and the auxiliary contact structure 3 rotate synchronously towards each other to be closed (i.e. the main contact structure 2 and the auxiliary contact structure 3 rotate synchronously to close contacts of the main contact structure 2 and the auxiliary contact structure 3) or rotate synchronously away from each other to be opened (i.e. the main contact structure 2 and the auxiliary contact structure 3 rotate synchronously to separate contacts of the main contact structure 2 and the auxiliary contact structure 3 from each other to be opened). Specifically, the primary contact structure 2 and the secondary contact structure 3 are pivotally arranged on the housing 1, respectively.

Further, the two sets of the auxiliary contact structures 3 are electrically connected with the first connection terminal 5 and the second connection terminal 6, respectively. Further, the first connection terminal 5 is directly or indirectly electrically connected to one set of sub-contact structures 3 (i.e. the first sub-contact structure 3 a) via the first conductor 51, and the second connection terminal 6 is directly or indirectly electrically connected to the other set of sub-contact structures 3 (i.e. the second sub-contact structure 3 b) via the second conductor 61. Further, the first conductor 51 and the second conductor 61 are all in soft connection, and the first conductor 51 and the second conductor 61 are all directly and electrically connected with the corresponding auxiliary contact structure 3.

Further, the main contact structure 2 includes a main contact 21, the auxiliary contact structure 3 includes an auxiliary contact 31, and two ends of the main contact 21 are respectively used for closing and opening with two groups of auxiliary contacts 31, so that the contact system is closed and opened, and a circuit where the switching device is located is closed and opened.

According to the contact system, the main contact structure 2 and the auxiliary contact structure 3 are pivoted, the double break points are formed, the main contact structure 2 and the auxiliary contact structure 3 rotate for a small angle, a large opening distance between the main contact structure 2 and the auxiliary contact structure 3 can be achieved, the breaking speed of the contact system is higher, and the breaking capacity of the contact system can be remarkably improved.

As shown in fig. 8.1-8.2, the two sets of the auxiliary contact structures 3 are synchronously rotated in the same direction, and the auxiliary contact structures 3 and the main contact structures 2 are synchronously rotated in opposite directions, namely: when the auxiliary contact structure 3 and the main contact structure 2 are closed, the two auxiliary contact structures 3 synchronously rotate towards a third direction, and simultaneously the main contact structure 2 rotates towards a fourth direction, and the third direction and the fourth direction are opposite to each other; when the auxiliary contact structure 3 and the main contact structure 2 are disconnected, the two auxiliary contact structures 3 synchronously rotate in the fourth direction, and simultaneously the auxiliary contact structure 2 rotates in the third direction. Specifically, as shown in fig. 8.1-8.2, the third direction is counterclockwise, and the fourth direction is clockwise.

As shown in fig. 8.1-8.2, the rotation axes of the main contact structure 2 and the two sets of auxiliary contact structures 3 are arranged in parallel and are both located on the first plane, that is, the rotation axes of the main contact structure 2 and the two sets of auxiliary contact structures 3 are coplanar, and the rotation axes of the two sets of auxiliary contact structures 3 are respectively located at two sides of the rotation axis of the main contact structure 2 and are arranged at intervals parallel to the rotation axis of the main contact structure 2, so that the insulation gap and the creepage distance between the two sets of auxiliary contact structures 3 can be increased to the greatest extent, and the insulation performance can be improved.

As shown in fig. 8.1-8.2, the main contact structure 2 is in driving connection with two sets of auxiliary contact structures 3, namely: when one of the main contact structure 2 and the two sets of auxiliary contact structures 3 is driven to rotate by an external force (for example, a driving force provided by an operating mechanism of the switching device, which will be described later), the other two are driven to rotate. Specific: when the main contact structure 2 is driven to rotate by external force, the main contact structure respectively drives the two groups of auxiliary contact structures 3 to synchronously rotate; or when any one of the auxiliary contact structures 3 is driven to rotate by external force, the auxiliary contact structure 3 drives the main contact structure 2 to synchronously rotate, and the main contact structure 2 drives the other auxiliary contact structure 3 to synchronously rotate.

As shown in fig. 1-6 and 8.1-8.2, is one implementation of the driving connection of the primary contact structure 2 and the secondary contact structure 3: the main contact structure 2 comprises a main gear, the auxiliary contact structure 3 comprises auxiliary gears 322 meshed with the main gear, namely, two auxiliary gears 322 are respectively meshed and matched with the main gear, and any one of the three gears rotates to drive the other two gears to synchronously rotate.

Of course, the driving connection of the primary contact structure 2 and the secondary contact structure 3 is not limited to one of the above-mentioned implementations, for example: the main contact structure 2 is provided with a driving arm parallel to the rotation axis of the main contact structure 2, the auxiliary contact structure 3 is provided with a corresponding kidney-shaped driven hole, the driving arm is inserted into the kidney-shaped driven hole, and the matching mode and principle of the driving arm and the driven hole are conventional technical means in the field and are not described herein. In other words, it is within the scope of the present application to achieve a drive connection between the primary contact structure 2 and the secondary contact structure 3.

As shown in fig. 1-8.2, the main contact structure 2 comprises a main support 23 arranged in a pivoting manner and a main contact 21 arranged on the main support 23, the auxiliary contact structure 3 comprises an auxiliary support 32 arranged in a pivoting manner and an auxiliary contact 31 arranged on the auxiliary support 32, and two ends of the main contact 21 are used for closing and opening the two auxiliary contacts 31. Further, the main gear includes two sets of sector gears 233 disposed on both radial sides of the main support 23 and coaxially disposed with the main contact structure 2, and the two sets of sector gears 233 are respectively engaged with the sub gears 322 on the two sets of sub contact structures 3.

As shown in fig. 1-3, the main support 23 includes a main contact receptacle provided in the middle thereof, the main contact 21 is inserted into the main contact receptacle and two ends thereof protrude from both radial sides of the main support 23, the main contact 21 is also in limit fit with the main support 23, and the main contact 21 is prevented from moving along the main contact receptacle, so as to ensure reliable closing of the two ends of the main contact 21 with the two sets of auxiliary contacts 31.

As shown in fig. 1-3, the main support 23 includes a support cover 232 and a support seat 231 that are relatively spliced along an axial direction (same as the axial direction of the rotation shaft of the main contact structure 2), the support seat 231 is provided with a main contact slot 234, and the support cover 232 covers the main contact slot 234 to form a main contact receptacle. The structure of the main support 23 simplifies the structure and assembly operations of the main contact structure 2.

As other embodiments, the main contact receptacle is formed by two half slots provided on the support seat 231 and the support cover 232, respectively, which are relatively split in the circumferential direction of the main support 23.

Further, two sets of sector gears 233 of the main gear are provided on both radial sides of the supporting seat 231, respectively.

Further, the main support 23 includes a positioning protrusion disposed on an inner sidewall of the main contact receptacle, and the main contact 21 includes a positioning slot 214 disposed thereon, and the positioning protrusion and the positioning slot 214 are in plug-in limit fit to prevent the main contact 21 from moving along the main contact receptacle. Further, the positioning protrusions include a supporting seat positioning protrusion 2311 provided on the bottom wall of the main contact slot 234 and/or a supporting cover positioning protrusion 2321 provided on the supporting cover 232, and a positioning groove 214 is provided on a side edge of the main contact 21 facing the bottom wall of the main contact slot 234 and/or a side edge of the main contact 21 facing the supporting cover 232; namely, the method comprises the following steps: the support seat positioning protrusion 2311 and the support cover positioning protrusion 2321 may be alternatively arranged or simultaneously arranged, and the two positioning slots 214 may be correspondingly alternatively arranged or simultaneously arranged.

Further, the supporting seat 231 further includes two extending portions 237, the two extending portions 237 are respectively protruded on two radial sides of the supporting seat 231, two ends of the main contact slot 234 are respectively disposed in the two extending portions 237, the two extending portions 237 lengthen the length of the main contact slot 234, and the length of the mating portion between the main contact 21 and the main contact slot 234 is increased, so that the reliability of assembly is ensured, and the portion of the main contact 21 protruding outside the main support 231 is reduced, the possibility that the main contact 21 is bent is reduced, and the insulation gap and the creepage distance between the main contact 21 and the auxiliary contact 31 after being disconnected are also improved. Further, the cross section of the extension 237 is a U-shaped structure, and surrounds the outside of the main contact 21.

As shown in fig. 1-2, the main support 23 includes main support shafts provided on both axial ends thereof, respectively. Further, the two main supporting shafts are a supporting seat shaft 2313 provided on the supporting seat 231 and a supporting cover shaft 2323 provided on the supporting cover 232, respectively.

As shown in fig. 2, the main support 23 further includes a plugging structure, where the plugging structure includes plugging columns 2322 and plugging holes 2312, one is disposed on the support cover 232, the other is disposed on the support seat 231, specifically, the plugging columns 2322 are disposed on a side of the support cover 232 facing the support seat 231, and the plugging holes 2312 are disposed at an end of the support seat 231 facing the support cover 232; when the supporting seat 231 and the supporting cover 232 are assembled, the plugging posts 2322 are plugged into the plugging holes 2312. Further, the two plug-in posts 2322 are arranged on the supporting cover 232 at intervals side by side, and the two plug-in holes 2312 are arranged on the supporting seat 231 at intervals side by side.

As shown in fig. 1-2, the main support 23 further includes a connection post 235 and a connection hole 236 provided at both axial ends thereof, respectively; when the contact systems are used in parallel and linked along the axial direction of the rotating shaft of the main contact structure 2, in two adjacent main supports 23, the connecting column 235 of one main support 23 and the connecting hole 236 of the other main support 23 are in plug-in fit so as to enable the two main supports 235 to synchronously rotate. Further, the connecting post 235 is a polygonal post, and the connecting hole 236 is a polygonal hole.

As another embodiment, when a plurality of the contact supports are used in parallel linkage along the axial direction of the rotating shaft of the main contact structure 2, each main support 23 is connected in a transmission manner by at least one linkage shaft, and the linkage shafts are arranged in parallel and spaced with the rotating axis of the main contact structure 2.

It should be noted that the above structure for implementing parallel linkage of multiple groups of contact systems may be set or cancelled according to needs, for example, when only one group of contact systems is set in the switching apparatus, the structure is cancelled when the switching apparatus sets multiple groups of contact systems that are linked side by side.

As shown in fig. 8.1-8.2, one of the two sets of the auxiliary contact structures 3 is a first auxiliary contact structure 3a electrically connected to the first connection terminal 5, and the other set is a second auxiliary contact structure 3b electrically connected to the second connection terminal 6; the auxiliary support 32 and the auxiliary contact 31 of the first auxiliary contact structure 3a are respectively a first auxiliary support 32a and a first auxiliary contact 31a, and the auxiliary support 32 and the auxiliary contact 31 of the second auxiliary contact structure 3b are respectively a second auxiliary support 32b and a second auxiliary contact 31b; the first auxiliary support 32a and the second auxiliary support 32b are respectively connected with the main support 32 in a transmission way, and the first auxiliary contact 31a and the second auxiliary contact 31b are respectively closed and opened with two ends of the main contact 21.

As shown in fig. 8.1-8.2, the two sets of the auxiliary contact structures 3 are symmetrical with each other with the rotation center of the main contact structure 2 as a symmetry center.

As shown in fig. 4-7, is an embodiment of the secondary contact structure 3.

As shown in fig. 4-5, the auxiliary contact structure 3 includes a pivotally arranged auxiliary support 32 and an auxiliary contact 31 arranged on the auxiliary support 32, wherein the auxiliary contact 31 swings to be closed or opened with the main contact 2 under the driving of the auxiliary support 32, one end of the auxiliary contact 31 is arranged on the auxiliary support 32, and the other end is closed or opened with the main contact 21.

As shown in fig. 5, the sub-contact 31 is rotatably disposed with respect to the sub-support 32; the auxiliary contact structure 3 further comprises an auxiliary spring 33, wherein the auxiliary spring 33 is arranged between the auxiliary contact 31 and the auxiliary support 32, and the auxiliary spring 33 applies the same over-travel force to the auxiliary contact 31 and the main contact 21 when the auxiliary contact 31 and the main contact 21 are closed; that is, the auxiliary spring 33 makes the auxiliary contact 31 and the auxiliary support 32 limit-match and keep relatively static, before the auxiliary support 32 drives the auxiliary contact 31 to rotate to make initial contact with the main contact 21, the auxiliary contact 31 and the auxiliary support 32 keep synchronous action, when the auxiliary contact 31 contacts with the main contact 21, the auxiliary support 32 continues to rotate a certain angle along the original direction, at this time, the auxiliary contact 31 rotates relatively to the auxiliary support 31 to generate over-travel, the auxiliary contact 31 compresses the auxiliary spring 33, and the auxiliary spring 33 applies over-travel force to the auxiliary contact 31 to make the auxiliary contact 33 compress the main contact 21 so as to ensure reliable closing of the auxiliary contact 31 and the main contact 21.

As shown in fig. 5 to 6, the sub-holder 32 includes a sub-contact receptacle 320 provided at a central portion thereof, and the sub-contact 31 is inserted into the sub-contact receptacle 320 at one end and protrudes outside the sub-holder 32 at the other end to be closed or opened with the main contact 21. Further, the secondary spring 33 is a torsion spring, and is disposed in the secondary contact jack 320, one spring arm is matched with the secondary contact 31 to be a stationary arm, and the other spring arm is matched with the side wall of the secondary contact jack 320 to be a movable arm; when the auxiliary contact 31 rotates relative to the auxiliary support 32 after contacting with the main contact 21, the auxiliary contact 31 presses the movable arm to compress the torsion spring, so that the auxiliary spring 33 stores energy.

Further, as shown in fig. 5 and 7, the secondary contact 31 includes a secondary contact limiting protrusion 312, and one end of the secondary spring 33 is in limit fit with the secondary contact limiting protrusion 312 to prevent the secondary contact 32 from coming out of the secondary contact jack 320, so as to ensure the stability of the assembly of the secondary contact 31. Specifically, one spring arm of the secondary spring 33 includes a limiting section, and the limiting section is located between the secondary contact limiting protrusion 312 and the inlet of the secondary contact jack 320 and is in limiting fit with the secondary contact limiting protrusion 312, so as to prevent the secondary contact 31 from falling out of the secondary contact jack 320.

Further, as shown in fig. 5, the secondary contact jack 320 includes a blocking surface 324 disposed at the inlet thereof, and the free end of the spring arm of the secondary spring 33 cooperating with the inner sidewall of the secondary contact jack 320 is in limit fit with the blocking surface 324 to prevent the secondary spring 33 from coming out of the secondary contact jack 320; that is, the free end of the stationary arm of the sub-spring 33 abuts against the blocking surface 324.

As shown in fig. 4 and 6, the secondary support 32 further includes a limiting portion 326, the limiting portion 326 is disposed outside the inlet of the secondary contact jack 320, and the secondary spring 33 makes the secondary contact 31 abut against the limiting portion 36; the limit portion 326 increases the length of the mating portion between the auxiliary contact 31 and the auxiliary support 32, so that the installation reliability of the auxiliary contact 31 is ensured, and the arm of force acting on the auxiliary contact 31 by the auxiliary spring 33 is increased, and the free end of the limit portion 36 is used as a fulcrum when the auxiliary contact 31 rotates relative to the auxiliary support 32, so that the over-travel force is increased, and the closing reliability of the auxiliary contact 31 and the main contact 21 is ensured.

As shown in fig. 5-7, the auxiliary contact 31 includes an auxiliary contact inner section 310 and an auxiliary contact outer section 311 which are sequentially connected, and the connection part of the auxiliary contact inner section 310 and the auxiliary contact outer section 311 forms auxiliary contact step surfaces 310-311; the secondary support 32 further includes secondary contact positioning surfaces 325 disposed on both sides of the inlet of the secondary contact receptacle 320, and the secondary contact positioning surfaces 325 and the secondary contact stepped surfaces 310-311 limit-fit with each other to define the depth of insertion of the secondary contact 31 into the secondary contact receptacle 320, thereby ensuring the accuracy of the assembly of the secondary contact 31.

As shown in fig. 8.1-8.2, the switching device of the present utility model is preferably a circuit breaker, and the following is an embodiment of the circuit breaker.

The circuit breaker of the embodiment further comprises an operating mechanism which is respectively arranged in the shell 1 and is used for driving the contact system to be closed and opened, the operating mechanism comprises a lever mechanism 11, the lever mechanism 11 comprises a locking piece 11-2 and a tripping piece 11-3 which are respectively pivoted and are in snap fit, the tripping piece 11-3 is driven by external force to rotate, and the snap fit with the locking piece 11-2 is released, so that the circuit breaker is tripped and opened.

Further, the operating mechanism further comprises a handle 7 and a front connecting rod 10 which are pivotally arranged on the shell 1, the handle 7 is in transmission connection with a lever mechanism 11 through the front connecting rod 10, and the lever mechanism 11 is in transmission connection with the main contact structure 2 or any auxiliary contact structure 3. Further, the lever mechanism 11 further includes a rotating plate 11-1 pivotally disposed on the housing 1, the latch member 11-2 and the trip member 11-3 are pivotally disposed on the rotating plate 11-1, and the rotating plate 11-1 is in transmission connection with the main contact structure 2 or any one of the auxiliary contact structures 3. Further, the operating mechanism further comprises a rear connecting rod 12, and the lever mechanism 11 is in transmission connection with the main contact structure 2 or any auxiliary contact structure 3 through the rear connecting rod 12. Specifically, in the circuit breaker of the present embodiment, the rotating plate 11-1 of the lever mechanism 11 is in transmission connection with the first auxiliary support 32a of the first auxiliary contact structure 3 through the rear link 12.

As a further embodiment, the pivoting plate 11-1 of the lever mechanism 11 is realized by the main support 23 of the main contact structure 2 or the auxiliary support 32 of the auxiliary contact structure 3, i.e. the catch 11-2 and the release 11-3 are pivotally arranged on the main support 23 or the auxiliary support 32, respectively, such an operating mechanism does not require the provision of the rear link 12.

The operating mechanism of the two implementations is a typical four-bar linkage operating mechanism, and the working principle and the working process of the operating mechanism are prior art in the field and are not described herein.

The circuit breaker of the embodiment also comprises an arc extinguishing system, wherein the arc extinguishing system comprises two groups of arc extinguishing chambers 4 respectively arranged at the two radial sides of the main contact structure 2; a group of arc extinguishing chambers 4 are arranged on the switching-on and switching-off paths of the first auxiliary contact structure 3a and the main contact structure 2; the other group of arc extinguishing chambers 4 are arranged on the switching-on and switching-off paths of the second auxiliary contact structure 3b and the main contact structure 2; in other words, a set of said secondary contact structures 3 (first secondary contact structure 3 a) and primary contact structure 2, are in counter-engagement with a set of arc-extinguishing chambers 4; the other set of said secondary contact structures 3 (second secondary contact structures 3 b) and primary contact structures 2 are in counter-engagement with the other set of extinguishing chambers 4. The arc extinguishing system further improves the breaking capacity of the switch unit. Further, a group of arc extinguishing chambers 4 are arranged on the switching-on and switching-off paths of one ends of the first auxiliary contact 3a and the main contact 21; the other group of arc extinguishing chambers 4 are arranged on the switching-on and switching-off paths of the second auxiliary contact 3b and the other end of the main contact 21. In other words: one end of the main contact 21 and a group of auxiliary contacts 31 (a first auxiliary contact 31 a) are oppositely matched with a group of arc extinguishing chambers 4; the end of the main contact 21 is in opposite fit with the arc inlet of the group of arc extinguishing chambers 4 in an open gap formed by breaking the group of auxiliary contacts 31. The other end of the main contact 21 is matched with the other group of auxiliary contacts 31 (second auxiliary contact 31 b) in an opposite way with the other group of arc extinguishing chambers 4; the end of the main contact 21 and the group of auxiliary contacts 31 are separated to form an open gap which is matched with the arc inlet of the group of arc extinguishing chambers 4 oppositely.

As shown in fig. 8.1-8.2, two ends of the arc-extinguishing chamber 4 extend to a switching-off position and a switching-on position corresponding to the auxiliary contact structure 3 respectively, that is, the arc-extinguishing chamber 4 covers the whole switching-on/off path corresponding to the auxiliary contact structure 3, and an inlet of the arc-extinguishing chamber 4 is opposite to a gap formed by breaking the auxiliary contact structure 3 and the main contact structure 2. The arc extinguishing chamber 4 is arranged in the mode, so that the breaking capacity of the contact system is further improved.

In the circuit breaker of the embodiment, the arc extinguishing chambers 4 comprise a plurality of arc extinguishing chamber modules, and each arc extinguishing chamber module is sequentially arranged along the rotation direction of the main contact structure 2 to form the arc extinguishing chambers 4. Further, each arc chute module includes a bulkhead and arc chute sheets disposed between the bulkhead. The arc extinguishing chamber 4 is formed by combining a plurality of arc extinguishing chamber modules, and is beneficial to reducing the production difficulty.

As another embodiment, the arc extinguishing chamber 4 includes a partition board and a grid sheet, and a plurality of grid sheets are arranged side by side around the contact system along the rotation direction of the main contact structure 2, and are located between two opposite partition boards, and two ends of each grid sheet are respectively and fixedly connected with the two partition boards. In the arc extinguishing chamber 4, the grid plates are uniformly distributed, so that the arc extinguishing capability is improved; moreover, such an arc extinguishing chamber 4 reduces the number of parts of the switching unit; but adds to the difficulty of self-assembly to some extent.

The circuit breaker of the embodiment further comprises an over-current protection mechanism 9, wherein the over-current protection mechanism 9 is used for driving the trip piece 11-3 to rotate so as to release the snap fit with the latch piece 11-2 when a short circuit and/or overload fault occurs in a circuit where the circuit breaker is located, so that the circuit breaker is tripped and opened.

The following is a layout of the circuit breaker of this embodiment:

The first wiring terminal 5, the contact system and the second wiring terminal 6 are sequentially arranged along a first direction d1, the operating mechanism and the contact system are sequentially arranged along a second direction d2, and the first direction d1 and the second direction d2 are perpendicular to each other. Specifically, as shown in fig. 8.1-8.2, the first direction d1 is an up-down direction, and the second direction d2 is a left-right direction. The layout of the circuit breaker is compact and reasonable, the whole specification volume of the circuit breaker is effectively controlled, and the internal insulation performance of the circuit breaker is guaranteed.

Further, two sets of said arc-extinguishing chambers 4 are located on both sides of the first plane (the plane in which the axes of rotation of the primary contact structure 2 and the secondary contact structure 3 lie).

Further, the overcurrent protection mechanism 9 and the lever mechanism 11 are arranged side by side along the first direction d 1.

Further, the housing 1 includes a first terminal cavity 1-1, a main body cavity 1-0 and a second terminal cavity 1-2 which are sequentially separated from each other along a first direction d1, and an operation cavity 1-4 which is separated from the main body cavity 1-0 along a second direction; the first connecting terminal 5 is arranged in the first terminal cavity 1-1, the second connecting terminal 6 is arranged in the second terminal cavity 1-2, the contact system and the arc extinguishing system are arranged in the main cavity 1-0, and the operating mechanism and the overcurrent protection mechanism 9 are arranged in the operating cavity 1-4. The term "separation arrangement" means that a separation wall is provided between adjacent cavities (i.e., between the first terminal cavity 1-1 and the main cavity 1-0, between the main cavity 1-0 and the second terminal cavity 1-2, and between the operation cavity 1-4 and the main cavity 1-0).

Furthermore, the shell 1 is also provided with two groups of separation ribs 1-3, the two groups of separation ribs 1-3 are respectively positioned at two radial sides of the main contact structure 2, and the two groups of separation ribs 1-3 are matched with the contact system to separate the main cavity 1-0 into two contact cavities; the two ends of the main contact 21, the two groups of auxiliary contacts 31 and the two groups of arc extinguishing chambers 4 are respectively arranged in the two contact chambers, namely: one end of the main contact 21, one group of auxiliary contacts 31 and one group of arc extinguishing chambers 4 are arranged in one contact chamber, and the other end of the main contact 21, the other group of auxiliary contacts 31 and the other group of arc extinguishing chambers 4 are arranged in the other contact chamber. Further, the two sets of the separation ribs 1-3 are respectively in clearance fit with the auxiliary supports 32 of the two sets of the auxiliary contact structures 3, that is, a necessary small clearance is arranged between the separation ribs 1-3 and the auxiliary supports 32, so that the auxiliary supports 32 can freely rotate to realize the closing and opening of the main contacts 2.

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. A circuit breaker comprising a housing (1), and an operating mechanism, a contact system, a first connection terminal (5) and a second connection terminal (6) respectively arranged in the housing (1); the operating mechanism is used for driving the contact system to be closed and opened, the operating mechanism comprises a lever mechanism (11), the lever mechanism (11) comprises a locking piece (11-2) and a tripping piece (11-3) which are respectively pivoted and in snap fit, the tripping piece (11-3) is driven by external force to rotate, and the snap fit with the locking piece (11-2) is released, so that the circuit breaker is tripped and opened;

The method is characterized in that: the first wiring terminal (5), the contact system and the second wiring terminal (6) are sequentially arranged along a first direction d1, and the operating mechanism and the contact system are sequentially arranged along a second direction d 2; the contact system comprises a main contact structure (2) and an auxiliary contact structure (3) which are respectively pivoted and synchronously rotate, wherein the two groups of auxiliary contact structures (3) are respectively arranged on two radial sides of the main contact structure (2), are respectively electrically connected with a first wiring terminal (5) and a second wiring terminal (6) and are synchronously closed or opened with the main contact structure (2).

2. The circuit breaker according to claim 1, characterized in that: the circuit breaker also comprises an arc extinguishing system, wherein the arc extinguishing system comprises two groups of arc extinguishing chambers (4) which are respectively arranged at the two radial sides of the main contact structure (2); the group of auxiliary contact structures (3) and the main contact structures (2) are oppositely matched with the group of arc extinguishing chambers (4); the other group of auxiliary contact structures (3) and the main contact structures (2) are matched with the other group of arc extinguishing chambers (4) oppositely.

3. The circuit breaker according to claim 2, characterized in that: the rotation axes of the main contact structure (2) and the two groups of auxiliary contact structures (3) are arranged in parallel and are both positioned on a first plane, and the two groups of arc extinguishing chambers (4) are respectively arranged on two sides of the first plane.

4. The circuit breaker according to claim 2, characterized in that: the circuit breaker also comprises an overcurrent protection mechanism (9), wherein the overcurrent protection mechanism (9) is used for driving the disengaging piece (11-3) to rotate so as to disengage the snap fit with the locking piece (11-2) when a short circuit and/or overload fault occurs in a circuit where the circuit breaker is located.

5. The circuit breaker of claim 4, wherein: the lever mechanism (11) and the overcurrent protection mechanism (9) are arranged side by side along a first direction d1, and the overcurrent protection mechanism (9) and the contact system are arranged side by side along a second direction d 2.

6. The circuit breaker of claim 4, wherein: the shell (1) comprises a first terminal cavity (1-1), a main cavity (1-0) and a second terminal cavity (1-2) which are sequentially arranged in a separated mode along a first direction d1, and an operation cavity (1-4) which is arranged in a separated mode along a second direction d2 and the main cavity (1-0);

The first wiring terminal (5) is arranged in the first terminal cavity (1-1), the second wiring terminal (6) is arranged in the second terminal cavity (1-2), the contact system and the arc extinguishing system are arranged in the main cavity (1-0), and the operating mechanism and the overcurrent protection mechanism (9) are arranged in the operating cavity (1-4); the first direction d1 and the second direction d2 are perpendicular to each other.

7. The circuit breaker of claim 6, wherein: the shell (1) is also provided with two groups of separation ribs (1-3), the two groups of separation ribs (1-3) are respectively positioned at the two radial sides of the main contact structure (2), and the two groups of separation ribs (1-3) and the contact system separate the main cavity (1-0) into two contact cavities;

The main contact structure (2) comprises a main contact (21), the auxiliary contact structure (3) comprises an auxiliary contact (31), and two ends of the main contact (21) are respectively closed or opened with two groups of auxiliary contacts (31); the two ends of the main contact (21), the two groups of auxiliary contacts (31) and the two groups of arc extinguishing chambers (4) are respectively arranged in the two contact cavities.

8. The circuit breaker according to any one of claims 1-7, characterized in that: the main contact structure (2) and the auxiliary contact structure (3) synchronously rotate in opposite directions to be closed or synchronously rotate in opposite directions to be opened.

9. The circuit breaker of claim 8, wherein: the main contact structure (2) is respectively connected with the two groups of auxiliary contact structures (3) in a transmission way.

10. The circuit breaker according to claim 9, characterized in that: the main contact structure (2) comprises a main gear, and the auxiliary contact structure (3) comprises an auxiliary gear (322) in meshed fit with the main gear.

11. The circuit breaker according to claim 9, characterized in that: the two groups of auxiliary contact structures (3) are mutually symmetrical with the rotation center of the main contact structure (2) as a symmetrical center.

12. The circuit breaker of claim 8, wherein: the two groups of auxiliary contact structures (3) are synchronously and rotatably arranged in the same direction, and the auxiliary contact structures (3) and the main contact structures (2) are synchronously and reversely rotatably arranged.

13. The circuit breaker according to claim 9, characterized in that: the operating mechanism further comprises a handle (7) and a front connecting rod (10) which are pivotally arranged on the shell (1), the handle (7) is in transmission connection with the lever mechanism (11) through the front connecting rod (10), and the lever mechanism (11) is in transmission connection with the main contact structure (2) or any auxiliary contact structure (3).

14. The circuit breaker of claim 13, wherein: the operating mechanism also comprises a rear connecting rod (12), and the lever mechanism (11) is in transmission connection with the main contact structure (2) or any auxiliary contact structure (3) through the rear connecting rod (12).

15. The circuit breaker of claim 14, wherein: the lever mechanism (11) further comprises a rotating plate (11-1) which is pivoted on the shell (1), the locking piece (11-2) and the tripping piece (11-3) are respectively pivoted on the rotating plate (11-1), and the rotating plate (11-1) is in transmission connection with the main contact structure (2) or any auxiliary contact structure (3).