CN108878226B

CN108878226B - Circuit breaker

Info

Publication number: CN108878226B
Application number: CN201810772348.0A
Authority: CN
Inventors: 刘成萍; 鲁骞; 胡建帅
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2018-07-13
Filing date: 2018-07-13
Publication date: 2024-05-17
Anticipated expiration: 2038-07-13
Also published as: CN108878226A

Abstract

The circuit breaker comprises a plurality of circuit breaker units which are arranged side by side, and a linkage shaft connected between the circuit breaker units, wherein each circuit breaker unit comprises a handle, a movable contact, a stationary contact, an operating mechanism which is arranged in a shell and drives the movable contact to contact with and separate from the stationary contact, a tripping protection mechanism and a linkage piece connected with the linkage shaft, the linkage piece is positioned between the operating mechanism and the tripping protection mechanism, one side of the linkage piece is provided with a pushing part matched with the tripping protection mechanism, the other side of the linkage piece is provided with a linkage part matched with the operating mechanism, the linkage piece is connected with the linkage piece of each circuit breaker unit through the linkage shaft, the operating mechanism in each circuit breaker unit pushes the linkage part of the linkage piece when any circuit breaker unit trips, and the linkage piece in other circuit breaker units is driven to rotate by the linkage shaft through the linkage shaft, and the linkage pieces in other circuit breaker units trigger the tripping protection mechanisms in other circuit breaker units to trip through the pushing parts.

Description

Circuit breaker

Technical Field

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

Background

The circuit breaker is an important component of the electrical industry, has been widely used, and when an electrical circuit works normally, the circuit breaker can achieve the functions of power failure, power supply, circuit conversion and the like by closing or opening a circuit for supplying electric energy; when the electrical circuit is overloaded, short-circuited and the like, the circuit breaker can cut off the electrical circuit by tripping, so that the safety of workers and the normal operation of equipment are prevented from being endangered by circuit faults. When the circuit breaker is used in a three-phase four-wire system power system, a multipolar circuit breaker unit is required to be installed according to application occasions to protect an electric circuit, and when overload or short-circuit fault occurs in any one phase of electric circuit, in order to prevent the electric circuit of other phases from being influenced, the circuit breaker unit on the phase is required to be linked with other circuit breaker units to cut off the electric circuits of other phases at the same time, so that the protection of the whole electric circuit is realized. However, in the existing circuit breaker, the linkage mechanism for linking other circuit breaker units occupies a large space, and is difficult to assemble and design automatically.

Summary of the invention

The invention aims to overcome the defects of the prior art and provides a circuit breaker with simple structure and high reliability.

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

The circuit breaker comprises a plurality of circuit breaker units arranged side by side, and a linkage shaft 450 connected among the circuit breaker units, wherein the circuit breaker units comprise a handle 100, a movable contact 510, a fixed contact, an operating mechanism arranged in a shell and used for driving the movable contact 510 to contact with and separate from the fixed contact, a tripping protection mechanism 300 and a linkage piece 400 connected with the linkage shaft 450, the linkage piece 400 is positioned between the operating mechanism and the tripping protection mechanism 300, one side of the linkage piece 400 is provided with a pushing part 430 matched with the tripping protection mechanism 300, and the other side of the linkage piece 400 is provided with a linkage part 440 matched with the operating mechanism.

Optionally, the pushing portion 430 and the linkage portion 440 of the linkage 400 are located on the same plane.

Optionally, the operating mechanism includes a trip button 210 that is snap-fitted with the trip protection mechanism 300 and a link 220 that is stacked above the trip button 210; the link portion 440 of the link 400 is stacked above the front surface of the link 220, and the trip button 210 is provided with a link plate 216 extending to the front surface to one side of the link 220 and engaged with the link portion 440.

Optionally, the trip protection mechanism 300 includes a bimetal 320, a fixed end 321 of the bimetal 320 is located at an end of the housing near the handle 100, and a swinging end 322 of the bimetal 320 that is bent by heating is located at an end of the housing near the movable contact 510, and the swinging end 322 is connected to the movable contact 510 through a soft connection 535.

Optionally, the circuit breaker further comprises an indication board 422 connected with the linkage 400, an indication opening 4200 matched with the indication board 422 is arranged on the casing of the circuit breaker unit, and an indication mark 421 is arranged in the indication opening 4200.

Optionally, the circuit breaker further includes a quick trip portion 420 connected to the linkage 400 and extending out of the casing of the circuit breaker unit, where the quick trip portion 420 can drive the linkage shaft 450 to rotate and trigger the trip protection mechanism 300 through the pushing portion 430 to release the snap fit with the operating mechanism.

Optionally, the linkage member 400 includes a linkage assembly part 410 mounted on a linkage shaft 450, a quick release part 420 extending out of the casing of the circuit breaker unit is provided at one end of the linkage assembly part 410, and a push part 430 is provided at the other end; the quick release part 420 is provided with an indication board 422; the end of the pushing portion 430 is provided with a pushing cambered surface 433 that cooperates with the armature 340, one side of the pushing portion 430 is provided with a linkage portion 440 that cooperates with the trip 210, the linkage portion 440 is in a V-shaped hollow structure, and the V-shaped hollow structure comprises a first supporting rod 441 connected with one end of the pushing portion 430 and a second supporting rod 442 connected with the other end of the pushing portion 430, and the first supporting rod 441 is connected with the second supporting rod 442 in a V-shape.

Optionally, the trip protection mechanism 300 includes a bimetal 320 and an armature 340 snap-fitted with the operating mechanism, a pole shoe 330 spaced from the armature 340 is disposed on the bimetal 320, a spring piece 311 connected to one end of the bimetal 320 is disposed at one end of the armature 340, a connecting piece 313 matched with the bimetal 320 is disposed at the other end of the armature 340, the bimetal 320 bends and drives the armature 340 through the connecting piece 313 to release the snap-fit with the operating mechanism when overloaded, and the electromagnetic force of the pole shoe 330 attracts the armature 340 to release the snap-fit with the operating mechanism when short-circuited.

Optionally, the operating mechanism includes a connecting rod 220 and a trip button 210, one end of the connecting rod 220 is connected with the handle 100, and the other end is connected with the movable contact 510; the trip button 210 is pivotally installed in the housing, and the trip button 210 is provided with a snap part 213 snap-fitted with the trip protection mechanism 300 and a power part 215 fitted with the handle 100, and is connected with the link 220 through the return spring 201.

Optionally, the trip button 210 is U-shaped, and includes a pivot arm 211 hinged to the housing, a latch portion 213 snap-fitted to the trip protection mechanism 300, and a connection arm 212 connected between the pivot arm 211 and the latch portion 213, wherein a power portion 215 fitted to the handle 100 and a linkage plate 216 fitted to the linkage portion 440 of the linkage 400 are provided on the connection arm 212, and the power portion 215 is connected to the link 220 through a return spring 201, and the linkage plate 216 and the trip protection mechanism 300 are located at both sides of the linkage 400, respectively.

The circuit breaker of the invention is connected with the linkage piece 400 of each level of circuit breaker units through the linkage shaft 450, the linkage piece 400 is arranged between the operating mechanism and the tripping protection mechanism 300, when any circuit breaker unit trips, the operating mechanism in the circuit breaker unit pushes the linkage part 440 of the linkage piece 400, the linkage piece 400 drives the linkage piece 400 in other circuit breaker units to rotate through the linkage shaft 450, and the linkage piece 400 in other circuit breaker units triggers the tripping protection mechanism 300 in other circuit breaker units to trip through the pushing part 430, so that the protection of the whole electric circuit is realized, and the whole structure is compact and reliable. In addition, the present invention creates the linkage part 440 of the trip button 210, the link 220 and the linkage 400 to be stacked by arranging the pushing part 430 and the linkage part 440 in the same plane, which not only can reduce the difficulty of processing and assembly, but also can facilitate the automated assembly design. In addition, one end of the trip protection mechanism 300 connected with the casing is located at one end of the casing close to the handle 100, and the swinging end 322 of the bimetallic strip 320, which is heated and bent, is located at one end of the casing close to the movable contact 510, so that the soft connection 535 connecting the movable contact 510 and the bimetallic strip is located at the lower side of the circuit breaker, and thus the linkage shaft 450 and the linkage piece 400 can be avoided, the whole structure of the circuit breaker is more compact, the pushing part 430 and the linkage part 440 are conveniently arranged in the same plane, the transmission of the trip force is more reliable, the difficulty of processing and assembling is reduced, and the automatic assembly is facilitated. In addition, the inter-pole linkage mechanism is also connected with the indicating board 422 of the linkage shaft 450, and the circuit breaker unit shell is provided with an indicating opening 4200 matched with the indicating board 422, so that whether the electric circuit is disconnected due to normal manual brake opening or tripping caused by faults can be conveniently and directly observed. In addition, through the quick tripping part 420 extending out of the casing of the circuit breaker unit, the linkage shaft 450 can be driven to rotate, the trip protection mechanism 300 is triggered to release the snap fit with the operating mechanism through the linkage piece 400, whether the circuit breaker can normally trip or not can be conveniently tested in production and normal use, when the circuit breaker needs to rapidly break an electric circuit, the circuit breaker can be tripped by pulling the quick tripping part 420 with small force, the handle 100 does not need to be pulled with great force to break the circuit breaker, and the speed of breaking the electric circuit when the circuit breaker trips is faster and safer than that when the circuit breaker breaks the gate.

Drawings

FIG. 1 is a schematic diagram of a circuit breaker of the present invention in closing;

Fig. 2 is a schematic view of the structure of the invention when the circuit breaker trips;

Fig. 3 is a schematic view of the structure of the invention when creating a circuit breaker rebuckles;

FIG. 4 is an enlarged view of a portion of A1 of FIG. 3 in accordance with the present invention;

fig. 5 is a schematic view of the structure of the invention when the breaker is opened;

FIG. 6 is an enlarged view of a portion of A2 of FIG. 5 in accordance with the present invention;

FIG. 7 is a schematic view of the structure of the inventive housing;

FIG. 8 is a schematic diagram of the structure of the trip protection mechanism of the present invention;

FIG. 9 is a side view of the inventive clip;

FIG. 10 is a first embodiment of the inventive clip;

FIG. 11 is a schematic illustration of the cooperation of the inventive spring and armature;

FIG. 12 is a second embodiment of the inventive clip;

FIG. 13 is a first embodiment of the invention creating a pole piece;

FIG. 14 is a second embodiment of the invention creating pole pieces;

FIG. 15 is one embodiment of the invention for creating a trip buckle;

FIG. 16 is a schematic view of the assembly of the inventive handle and linkage;

FIG. 17 is an enlarged view of a portion of B1 of FIG. 1 in accordance with the present invention;

FIG. 18 is an enlarged view of a portion of B2 of FIG. 3 in accordance with the present invention;

FIG. 19 is one embodiment of the invention for creating a contact mechanism;

FIG. 20 is a side view of the invention creating FIG. 19;

FIG. 21 is a partial cross-sectional view of the inventive handle;

fig. 22 is one embodiment of the present invention for creating a quick trip mechanism;

FIG. 23 is a partial cross-sectional view of the invention creating C of FIG. 22;

FIG. 24 is a schematic illustration of the cooperation of a shutter with an indicator when no failure has occurred in accordance with the present invention;

FIG. 25 is a schematic view of the cooperation of the shielding plate and the indication mark in the event of failure in accordance with the present invention

FIG. 26 is a diagram of one embodiment of the present invention for creating an inter-pole linkage;

FIG. 27 is a schematic view of the engagement of the quick release fastener with the linkage shaft in accordance with the present invention;

FIG. 28 is one embodiment of the present invention for creating a quick release;

fig. 29 is a right side view of the invention creating fig. 28.

Detailed Description

Embodiments of the circuit breaker of the present invention are further described below with reference to the examples given in connection with fig. 1 to 29. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-3 and 5, the circuit breaker unit of the invention comprises a shell, a handle 100, an operating mechanism and a tripping protection mechanism 300, wherein the handle 100, the operating mechanism and the tripping protection mechanism 300 are arranged in the shell, the handle 100 is pivotally arranged in the shell, the handle 100 is connected with the operating mechanism, a movable contact 510 is connected with the operating mechanism, a trip button 210 of the operating mechanism is in lap joint with the tripping protection mechanism 300, a fixed contact 520 is arranged opposite to the movable contact 510, and the handle 100 drives the movable contact 510 to contact and separate from the fixed contact 520 through the operating mechanism, so that the switching on and off of a circuit are realized. As shown in fig. 1, the handle 100 swings to a closing position (ON) at one side, and the operating mechanism drives the movable contact 510 to contact with the stationary contact 520 so as to close the circuit breaker; as shown in fig. 5, the handle 100 swings to the other side of the opening position (OFF), and the operating mechanism drives the movable contact 510 to be separated from the stationary contact 520 so as to open the circuit breaker; as shown in fig. 2, when the circuit breaks down during the closing of the circuit breaker, the TRIP protection mechanism 300 releases the operation to TRIP the circuit breaker in a lap joint relation with the TRIP button 210, the movable contact 510 is separated from the stationary contact 520, and the handle 100 swings to a TRIP position (TRIP) between the closing position and the opening position; as shown in fig. 3, after the circuit breaker trips, the handle 100 cannot switch on the circuit breaker, and the handle 100 needs to be pulled to a switching-off position to drive the trip buckle 210 to be in snap fit with the trip protection mechanism 300 again to realize re-buckling, and after the re-buckling, the handle 100 can drive the movable contact 510 to swing through the operating mechanism to realize switching-on and switching-off of the circuit breaker.

When the circuit breaker is used for a three-phase four-wire system power system, the circuit breaker comprises a plurality of circuit breaker units which are arranged side by side, the circuit breaker units are arranged side by side and are respectively used for different phase lines, an interelectrode linkage mechanism is arranged among the circuit breaker units, when any one phase circuit breaks down and trips, the circuit breaker unit connected with the phase circuit trips, and other circuit breaker units are driven to be disconnected through the interelectrode linkage mechanism, so that the protection of the whole electric circuit is realized. The linkage mechanism of the circuit breaker as shown in fig. 26 to 29 includes a linkage shaft 450 connected between a plurality of circuit breaker units, a linkage 400 is provided in a housing of each circuit breaker unit, the linkage 400 of the multipole circuit breaker unit is connected through the linkage shaft 450, the linkage 400 is located between the operating mechanism and the trip protection mechanism 300, a pushing part 430 matched with the trip protection mechanism 300 is provided at one side of the linkage 400, and a linkage part 440 matched with the operating mechanism is provided at the other side of the linkage 400. The linkage mechanism of the circuit breaker is connected with the linkage pieces 400 of each level of circuit breaker units through the linkage shaft 450, the linkage pieces 400 are arranged between the operation mechanism and the tripping protection mechanism 300, when any circuit breaker unit trips, the operation mechanism in the circuit breaker unit pushes the linkage part 440 of the linkage pieces 400, the linkage pieces 400 drive the linkage pieces 400 in other circuit breaker units to rotate through the linkage shaft 450, and the linkage pieces 400 in other circuit breaker units trigger the tripping protection mechanism 300 in other circuit breaker units to trip through the pushing part 430, so that the whole electric circuit is protected, and the whole structure is compact and reliable. Of course, the linkage shaft 450 may be connected to the side-by-side trip units other than the circuit breaker unit, including an electric leakage trip unit, a remote trip unit, an under-voltage and over-voltage trip unit, and the like.

Preferably, the pushing portion 430 and the linkage portion 440 of the linkage 400 are located in the same plane, so that the moment on the linkage 400 can be transmitted in the same plane, and the linkage 400 can act more rapidly and reliably during operation.

As shown in fig. 26, a preferred embodiment of a linkage 400 arrangement includes a trip button 210 snap-fitted to a trip protection mechanism 300 and a link 220 stacked above the trip button 210; the linkage part 440 of the linkage 400 is stacked above the front surface of the connecting rod 220, the trip button 210 is provided with a linkage plate 216 which extends to one side of the connecting rod 220 towards the front surface and is matched with the linkage part 440 and the connecting rod 220, and the pushing part 430 and the linkage part 440 of the linkage 400 are positioned on the same plane. In this embodiment, the pushing portion 430 and the linkage portion 440 are disposed in the same plane, and the jump buckle 210, the connecting rod 220 and the linkage portion 440 of the linkage 400 are stacked, so that not only the difficulty of processing and assembly can be reduced, but also the automatic assembly design can be facilitated.

Further, the trip button 210 is U-shaped, and includes a pivot arm 211 hinged to the housing, a snap part 213 snap-fitted to the trip protection mechanism 300, and a connection arm 212 connected between the pivot arm 211 and the snap part 213, wherein a power part 215 fitted to the handle 100 and a link plate 216 fitted to the link part 440 and the link 220 of the link 400 are provided on the connection arm 212, and the power part 215 is connected to the link 220 through a return spring 201, and the link plate 216 and the trip protection mechanism 300 are located at both sides of the link 400, respectively. The connecting rod 220 comprises an articulated arm 221 hinged with the handle 100 and a contact arm 222 connected with the movable contact 510, the contact arm 222 is provided with a spring hook 223 connected with the reset spring 201, and when the circuit breaker is tripped, the linkage plate 216 not only can push the linkage piece 400 to drive other phase circuit breakers to trip, but also can push the contact arm 222 of the connecting rod 220 to accelerate the tripping speed, so that the breaking capacity of the circuit breaker is improved, and when the circuit breaker is closed, the linkage plate 216 on the trip buckle 210 needs to avoid the connecting rod 220.

Further, the contact arm 222 is connected with the hinge arm 221 in a V-shape, and a space capable of avoiding the linkage plate 216 during closing is formed between the hinge arm 221 and the contact arm 222. Of course, the hinge arm 221 and the contact arm 222 of the connecting rod 220 may be connected in other shapes, but the space formed between the hinge arm 221 and the contact arm 222 and avoiding the linkage plate 216 on the trip button 210 during closing is formed, so that the structure is more compact, and the occupied space is reduced.

As shown in fig. 26, in another preferred embodiment of the arrangement of the linkage 400, the trip protection mechanism 300 includes a bimetal 320, the fixed end 321 of the bimetal 320 is located at an end in the housing near the handle 100, the swinging end 322 of the bimetal 320 that is bent by heat is located at an end in the housing near the movable contact 510, the swinging end 322 is connected to the movable contact 510 through a soft connection 535, and the pushing portion 430 and the linkage portion 440 of the linkage 400 are located on the same plane. Through the one end that is close to handle 100 with the casing with trip protection mechanism 300 is located the one end that the casing is connected, and bimetallic strip 320 is heated the swing end 322 that buckles and is located the one end that is close to movable contact 510 in the casing for the soft hookup 535 that connects movable contact 510 and bimetallic strip is located the downside of circuit breaker, can dodge universal driving shaft 450 and linkage 400 like this, make the overall structure of circuit breaker compacter, be convenient for promote portion 430 and linkage portion 440 setting in the coplanar, not only can make the transmission of tripping force more reliable, moreover can reduce the degree of difficulty of processing and assembly, be convenient for automatic assembly.

As shown in fig. 26-29, the inter-pole linkage mechanism comprises a linkage shaft 450, a plurality of linkage members 400 connected with the linkage shaft 450, a quick tripping part 420 connected with the linkage members 400 and extending out of the shell of the circuit breaker unit, and an indication board 422 connected with the quick tripping part 420, wherein the quick tripping part 420 extending out of the shell on the linkage members 400 can trigger the armature 340 to act to release the snap fit with the operation mechanism, so that whether the circuit breaker can normally trip can be conveniently tested in production and normal use, and when the circuit breaker needs to rapidly disconnect an electric circuit, the circuit breaker can be tripped by pulling the linkage members 400 with small force, the circuit breaker is not required to be disconnected by pulling the handle 100 with large force, and the speed of disconnecting the electric circuit is faster and safer than that when the circuit breaker trips.

The trip button 210 and the bimetal 320 are respectively disposed at two sides of the armature 340, the linkage piece 400 is disposed at the front side of the trip button 210, the linkage piece 400 and the trip button 210 are disposed at the same side of the armature 340, the pole shoe 330 is disposed at one side of the bimetal 320 far away from the armature 340, the linkage piece 400 can push the armature 340 to be far away from the trip button 210, one end of the armature 340 is connected with one end of the bimetal 320 through the elastic sheet 311, preferably, the other end of the armature 340 is matched with the bimetal 320 through the connecting sheet 313, and the linkage piece 400 can directly push the armature 340. Of course, as other embodiments of the trip protection mechanism 300, the armature 340 may be disposed on the left side of the connecting piece 313, and the linkage 400 may be capable of releasing the trip button 210 by pushing the connecting piece 313 or pushing the armature 340, which falls within the protection scope of the present invention.

Specifically, the linkage 400 includes a linkage assembly portion 410 mounted on a linkage shaft 450, a quick trip portion 420 extending out of a casing of the circuit breaker unit is disposed at one end of the linkage assembly portion 410, a pushing portion 430 is disposed at the other end, and a linkage portion 440 matching with the trip buckle 210 is disposed at a side of the pushing portion 430 of the linkage 400 away from the trip protection mechanism 300; the quick release 420 can rotate the linkage shaft 450 and trigger the release protection mechanism 300 to release the snap fit with the operating mechanism via the push portion 430. An indication opening 4200 is provided on the housing, a chute 4201 is provided in the indication opening 4200, and the quick release 420 extends into the indication opening 4200 through the chute 4201. Further, the bottom of the indication opening 4200 is provided with an indication mark 421 at one side of the chute 4201, the quick trip portion 420 is provided with an indication board 422 for shielding the indication mark 421, the linkage 400 is abutted against the left side of the armature 340, when the circuit breaker is normally opened, the armature 340 will not move because the linkage is not opened, the indication mark 421 is shielded by the indication board 422 (fig. 24), and the observer can know that the electric circuit is not broken by normal opening, when the circuit breaker is tripped, the armature 340 will abut against the right side of the trip 210 and cannot be reset because of the trip, the indication board 422 can not be reset because of gravity (the right side of the circuit breaker faces downwards in the drawing, the left side faces upwards in the actual use) or the additionally provided blocking structure of the circuit breaker, so that the indication board 422 exposes the indication mark 421 (fig. 25), and the observer can know that the electric circuit is broken by observing the indication mark 421, and can conveniently judge that the electric circuit is broken by opening the electric circuit. The linkage member 400 in the above embodiment is a lever structure pivotally mounted in the housing, however, the linkage member 400 may also be a straight rod structure to directly push or pull the armature 340 and the trip button 210 to trip quickly, which belongs to the protection scope of the present invention.

As another embodiment, the quick release 420 does not extend out of the housing, the indication opening 4200 is matched with the indication board 422, and the linkage 400 can drive the indication board 422 to rotate under the indication opening 4200 when rotating, so that the indication board 422 can be detected from the appearance of the housing, or drive the indication board 422 to rotate beside the indication opening 4200, so that the indication board 422 cannot be detected from the appearance of the housing, or the indication board 422 is disposed in the housing and located in the middle of the quick release 420, and the end of the quick release 420 extends out of the housing for operation, which falls into the protection scope of the present invention.

Further, the linkage assembly portion 410 of the linkage 400 is provided with a linkage connection hole 411 for connecting the linkage shaft 450, and the housing is provided with a linkage avoidance hole 414 for avoiding the linkage shaft 450, and the linkage shaft 450 passes through the linkage avoidance hole 414 and out of the housing. In addition, the cross section of the linkage shaft 450 is preferably square, the linkage connection hole 411 is matched with the shape of the linkage shaft 450, and of course, the cross section of the linkage shaft 450 can also be rectangular, triangular or other polygonal, which falls within the protection scope of the present invention.

As shown in fig. 27, the linkage part 440 has a V-shaped hollow structure, which includes a first support rod 441 connected to one end of the pushing part 430 and used for matching with the linkage plate 216, and a second support rod 442 connected between the other end of the first support rod 441 and the other end of the pushing part 430, wherein the first support rod 441 and the second support rod 442 are connected in a V-shape, which not only can improve the structural strength of the linkage part 440, but also can reduce the weight of the linkage 400, reduce the consumption of processing materials, save energy and protect environment. As shown in fig. 26 and 28, the first supporting rod 441 includes a first supporting side 441a and a second supporting side 441b that are connected in a V-shape, the first supporting side 441a is matched with the linkage plate 216 on the trip button 210, the first supporting side 441a is preferably vertically connected with the second supporting rod 442, and the first supporting side 441a for matching with the trip button 210 is vertically arranged with the second supporting rod 442, so that the structural strength of the linkage member 400 can be improved, and the service life can be prolonged.

Furthermore, the linkage plate 216 of the trip button 210 is perpendicular to the pivot arm 211 of the trip button 210, when the trip button 210 is released from the snap fit with the trip protection mechanism 300, the reset spring 201 drives the linkage plate 216 to vertically abut against the first supporting side 441a, and by setting the linkage plate 216 perpendicular to the pivot arm 211 and the first supporting side 441a at the same time, the acting force of the trip button 210 can be more reasonably transferred when the trip strikes the linkage 400 and the connecting rod 220, especially when the multi-pole circuit breaker unit is in linkage, the trip button 210 is required to strike the trip protection mechanism 300 in the multi-pole circuit breaker unit at the same time through the linkage shaft 450, and the multi-pole circuit breaker unit has the characteristics of compact structure and long service life. In addition, the impact of the link plate 216 on the trip button 210 against the link 220 also enables the circuit breaker to trip quickly.

As shown in fig. 27, the pushing portion 430 is L-shaped, and includes a first pushing side 431 disposed between the linkage assembly portion 410 and the trip button 210, and a second pushing side 432 extending to the front of the trip button 210, wherein one end of the second pushing side 432 is connected with the first pushing side 431, and the other end of the second pushing side 432 is provided with a pushing cambered surface 433 that cooperates with the armature 340, so that the structure of the quick linkage 400 can be more compact and the strength can be higher through the pushing portion 430 disposed in the L-shape.

Further, the linkage assembly portion 410 is cylindrical, two opposite side walls of the housing are respectively provided with a supporting table 412 (fig. 7) matched with the front surface and the back surface of the linkage assembly portion 410, the supporting tables 412 are cylindrical, two sides of the front surface and the back surface of the linkage assembly portion 410 are respectively provided with a pivoting table 413 extending into the supporting tables 412 to be matched, the pivoting table 413 and the linkage assembly portion 410 are provided with a linkage connection hole 411 for connecting the linkage shaft 450, and the linkage assembly portion 410 can be reliably matched with the housing through the supporting tables 412, so that the stability of the linkage 400 during operation is ensured.

As shown in fig. 1 to 7 and 15, the operating mechanism of the present invention comprises a connecting rod 220 and a trip button 210, wherein one end of the connecting rod 220 is connected with the handle 100, and the other end is connected with the movable contact 510; the trip button 210 is pivotally installed in the housing, and the trip button 210 is provided with a snap part 213 snap-fitted with the trip protection mechanism 300 and a power part 215 fitted with the handle 100, and is connected with the link 220 through the return spring 201. The trip protection mechanism 300 is in snap fit with the trip button 210 to limit the trip button 210, so that the trip button 210 is basically kept in a static state, and when the handle 100 swings to a closing position (fig. 1) or a separating position (fig. 5), the handle 100 drives the connecting rod 220 to drive the movable contact 510 to contact and separate from the static contact 520, so that closing and separating of a circuit are realized. When the circuit fails, the trip protection mechanism 300 acts to release the snap fit with the trip button 210, so that the operating mechanism trips, after the trip button 210 loses the constraint of the trip protection mechanism 300, the reset spring 201 pulls the trip button 210 to rotate, and the power part 215 of the trip button 210 drives the connecting rod 220 to separate the movable contact 510 from the fixed contact 520 so as to trip and drive the handle 100 to rotate to a trip position (fig. 2). After tripping, the handle 100 is rotated to the opening position, and the handle 100 drives the trip button 210 to rotate through the power part 215 of the trip button 210 so that the snap part 213 and the trip protection mechanism 300 form a snap fit again (fig. 3).

As shown in fig. 7 to 10, the trip protection mechanism 300 of the present invention includes a bimetal 320 and an armature 340 snap-fitted with an operating mechanism, a pole piece 330 is provided on the bimetal 320 and spaced from the armature 340, a spring piece 311 is provided on one end of the armature 340 and connected to one end of the bimetal 320, the other end of the armature 340 can be driven to act when the bimetal 320 is bent, the bimetal 320 is bent to drive the armature 340 to release the snap-fit with the operating mechanism when overloaded, and the electromagnetic force of the pole piece 330 attracts the armature 340 to release the snap-fit with the operating mechanism when short-circuited. According to the tripping protection mechanism of the circuit breaker, the armature 340 is matched with the operating mechanism, the bimetallic strip 320 and the pole shoe 330 respectively, so that the armature 340 can be matched with the operating mechanism in a snap fit manner to play a role of locking, and can also be matched with the bimetallic strip 320 and the pole shoe 330 respectively to realize the functions of overload protection and short circuit protection, so that the overload protection and the short circuit protection are combined together reasonably through a three-stone bird design, and the circuit breaker has the characteristics of small occupied space, small number of parts and low production cost. It should be apparent that the trip protection mechanism 300 of the present invention may be used with other configurations of operating mechanisms as well as with embodiments of the operating mechanism of the present invention.

Specifically, as shown in fig. 1 to 7, a handle 100, an operating mechanism, a trip protection mechanism 300 and two connection terminals 530 are provided in a housing of the circuit breaker unit according to the present invention; the operating mechanism comprises a connecting rod 220 and a jump button 210, wherein the connecting rod 220 and the jump button 210 are arranged in a stacked manner, the connecting rod 220 is arranged above the front surface of the jump button 210, the left end of the jump button 210 is hinged with the shell, the middle part of the jump button is provided with a power part 215 matched with the handle 100, the right end of the jump button is provided with a hasp part 213 overlapped and matched with the trip protection mechanism 300, and the power part 215 of the jump button 210 extends to the lower part of the handle 100 towards the front surface and is matched with the power arm 130 of the handle 100; the top end of the connecting rod 220 is hinged with the handle 100, the bottom end of the connecting rod is connected with the jump button 210 through the reset spring 201, when the handle 100 rotates to a closing position and a separating position, the connecting rod 220 is driven to move, the bottom end of the connecting rod 220 is connected with the movable contact 510, the tripping protection mechanism 300 is arranged on the right side of the operating mechanism and is in lap joint with the jump button 210, a wiring terminal 530 is arranged on the right side of the tripping protection mechanism 300, the wiring terminal 530 is connected with the movable contact 510, another wiring terminal 530 and a fixed contact 521 connected with the wiring terminal 530 are arranged on the left lower part of the shell, the fixed contact 521 is provided with the fixed contact 520, and the wiring terminal 530 can also be a plug pin matched with a socket.

As shown in fig. 7-10, one embodiment of a trip protection mechanism 300 includes a bimetal 320 and an armature 340 snap-fitted to an operating mechanism, the armature 340 being located between the trip button 210 and the bimetal 320. One end of the armature 340 is provided with a spring piece 311 fixedly connected with one end of the bimetal 320, the other end is provided with a connecting piece 313 matched with the other end of the bimetal 320, the middle part of the armature 340 is provided with a first snap groove 2100 matched with the snap 210 in a snap way, and the snap part 213 of the snap 210 is snapped on the first snap groove 2100 to realize snap fit. The bimetal 320 includes a fixed end 321 disposed at one end and fixedly connected to the spring plate 311, and a swinging end 322 disposed at the other end and matched with the connecting plate 313, the pole shoe 330 is disposed in the middle of the bimetal 320 and spaced from the armature 340, the fixed end 321 of the bimetal 320 is connected to the connecting terminal 530 through the connecting plate 360, and the swinging end 322 of the bimetal 320 is connected to the movable contact 510 through the soft connection 535.

The bimetal 320 bends when overloaded and drives the armature 340 to move to the right away from the trip 210 by overcoming the action of the spring plate 311 through the connecting piece 313, and when a certain displacement is exceeded, the snap fit of the armature 340 and the trip 210 is released, so that overload protection is realized. The pole shoe 330 is a magnetic conductive material, preferably electrical pure iron, and the pole shoe 330 can attract the armature 340 to move away from the right side of the trip 210 against the action of the spring piece 311 when in short circuit, and release the snap fit of the armature 340 and the trip 210 when exceeding a certain displacement amount, so as to realize short circuit protection.

Preferably, as shown in fig. 8-9, the connecting piece 313 is U-shaped, the connecting piece 313 includes two opposite clamping edges, one clamping edge is fixedly connected with the armature 340, the other clamping edge is matched with the swinging end 322 of the bimetallic strip 320, one end of the bimetallic strip 320 extends to the inner side of the connecting piece 313, and when overload occurs, the armature 340 is pulled by the connecting piece 313 to release the snap fit with the operating mechanism. Further, the elastic piece 311 is provided with a bending part, the bending part bends the armature 340 towards one side far away from the bimetallic strip 320 in a natural state to form an included angle A with the vertical direction, the assembled bimetallic strip 320 is attached to the clamping edge on one side of the connecting piece 313, and the elastic piece 311 is pulled to bend back through the connecting piece 313 to bend so that the armature 340 forms an included angle B with the vertical direction, and the included angle B is smaller than the included angle A. Preferably, the included angle a is 8 degrees, and the included angle B is 5 degrees. The armature 340 is bent to the side far away from the bimetallic strip 320 through the elastic sheet 311, and then the bimetallic strip 320 drives the armature 340 to bend back, so that the armature 340 and the bimetallic strip 320 can be matched more reliably, the acting force applied to the armature 340 by the elastic sheet 311 can be improved, and the stroke of the armature 340 required to move during tripping can be reduced. In addition, the bimetal 320 drives the spring piece 311 to act through the connecting piece 313, so that the structure is more compact, and of course, the bimetal can also indirectly drive the armature 340 through an additional connecting rod, and the bending angle of the spring piece 311 under the natural condition and the bending angle of the bimetal 320 driving the spring piece 311 to bend back are not particularly limited.

As shown in fig. 8-10, an embodiment of the elastic piece 311 and the connecting piece 313 is shown, an auxiliary piece 312 is arranged between the elastic piece 311 and the connecting piece 313, the elastic piece 311 and the connecting piece 313 are connected through the auxiliary piece 312, the armature 340 is connected with the auxiliary piece 312, and the elastic piece 311, the connecting piece 313 and the auxiliary piece 312 are preferably formed by integrally punching materials such as stainless steel or tin bronze. As shown in fig. 11, in another embodiment of the spring plate 311 and the connecting plate 313, the spring plate 311 and the connecting plate 313 may be respectively welded with the armature 340 after being respectively formed, which falls within the protection scope of the present invention.

As shown in fig. 9-11, a second snap groove 2101 corresponding to the first snap groove 2100 on the armature 340 is provided on a clamping edge where the connecting piece 313 is connected with the armature 340, and the connecting piece 313 is provided with a snap plate 2102 in the second snap groove 2101, one end of the snap plate 2102 is connected with the connecting piece 313, the other end is bent into the first snap groove 2100 on the armature 340, one side of the snap plate 2102 is attached to a groove wall of the first snap groove 2100, and the other side is in snap fit with the snap 210. By bending the snap plate 2102 on the connecting piece 313 to form a snap surface for snap-fitting with the snap 210, the contact area is larger, the fitting is more reliable, the fitting is smoother, and no jamming occurs. Preferably, the spring plate 311 and the connecting plate 313 are respectively provided with a riveting positioning hole 341, the armature 340 is provided with a riveting convex hull matched with the riveting positioning holes 341, and the riveting convex hull and the riveting positioning holes 341 are matched and positioned and then welded, so that the device has the characteristics of being convenient to process and assemble.

Preferably, the trip protection mechanism 300 is inserted into the housing through a support 350. One side of the spring piece 311 is connected with the fixed end 321 of the bimetallic strip 320, and the other side is provided with a support piece 350 which is in plug-in fit with the shell of the circuit breaker unit, and the support piece 350 is fixedly connected with the spring piece 311. The side wall of the shell is provided with the inserting groove 3500 which is in inserting fit with the supporting piece 350, the elastic piece 311, the bimetallic strip 320 and the supporting piece 350 can be fixedly connected through welding respectively, and of course, the elastic piece 311, the bimetallic strip 320 and the supporting piece 350 can be connected through other modes, after being assembled into a whole outside the shell in advance, the tripping protection mechanism 300 is assembled into the shell in a whole, and the integral tripping protection mechanism 300 is inserted into the inserting groove 3500 on the shell through the supporting piece 350, so that the assembling difficulty is lower, the automatic design of the assembly is convenient, and the development trend of automatic production is met.

In particular, the trip protection mechanism 300 of the present invention is disposed within the housing on the operating mechanism side, with the end of the trip protection mechanism that is coupled to the housing being located at the end of the housing that is adjacent to the handle 100. As shown in fig. 1-3, the bimetal 320 is disposed on a side of the armature 340 away from the operating mechanism, the swinging end 322 of the bimetal 320 and the movable contact 510 are located at the same end in the housing, the fixed end 321 is located at an end in the housing near the handle 100, and the swinging end 322 is connected to the movable contact 510 through a soft connection 535. The armature 340 and the rotation center of the trip 210 are respectively located at two sides of the buckling surfaces of the armature 340 and the trip 210, when the armature 340 is buckled on the armature 340, the armature 340 is abutted against the side wall of one side of the first buckling groove 2100, which is far away from the rotation center of the armature 340, and the armature 340 is pulled towards one side, which is far away from the rotation center of the armature 340, instead of pushing the armature 340 towards the rotation center, so that the flexible travel of the bimetallic strip 320 is ensured to be longer under the condition that the space is more compact, the action is more sensitive, the soft connection 535 for connecting the movable contact 510 and the bimetallic strip is located at the lower side of the circuit breaker, an avoidance space is formed, the operating mechanism and the linkage 400 can be reasonably arranged in a laminated mode, the whole structure of the circuit breaker is more compact, the automatic design of assembly is facilitated, and the setting of the linkage mechanism of the circuit breaker is facilitated.

As shown in fig. 12, in a first embodiment of the pole shoe 330, the pole shoe 330 is disposed on a side of the bimetal 320 away from the armature 340, that is, on a side of the bimetal 320 bent toward the passive layer, the pole shoe 330 is disposed at a distance from the bimetal 320, a connection leg 331 bent toward the bimetal 320 is disposed at one end of the pole shoe 330, the connection leg 331 may be fixedly connected with the bimetal 320 by welding or the like, and interference with bending of the bimetal 320 can be avoided by disposing the pole shoe 330 at a distance from the bimetal 320.

Further, the pole piece 330 is U-shaped, and the U-shaped pole piece not only can increase the heating value by increasing the surface area of the bimetal 320, but also can enhance the electromagnetic attraction of the pole piece 330, and has the characteristic of compact structure.

As shown in fig. 13-14, in a second embodiment of the pole piece 330, the pole piece 330 is in a flat plate shape, a pole piece welding convex hull 335 protruding toward the bimetal 320 is provided on the back surface of the pole piece 330, a process hole 336 corresponding to the processing of the pole piece welding convex hull 335 is provided on the front surface of the pole piece 330, and the pole piece 330 is welded with the bimetal 320 through the pole piece welding convex hull 335 and is arranged at intervals to avoid interference with bending of the bimetal 320. The ability of the flat plate-shaped pole piece 330 and the U-shaped pole piece 330 to generate electromagnetic force is different, and the flat plate-shaped pole piece 330 and the U-shaped pole piece 330 are suitable for products with different rated currents, however, the pole piece 330 can be in other shapes, and the pole piece 330 can be connected with the bimetallic strip 320 in other manners besides welding, which falls into the protection scope of the invention.

As shown in fig. 1-7, in one embodiment of the operating mechanism of the present invention, the operating mechanism includes a connecting rod 220 and a trip button 210, the connecting rod 220 is stacked with the trip button 210, and the connecting rod 220 is disposed above the front surface of the trip button 210, the left end of the trip button 210 is hinged with the housing, the middle part is provided with a power part 215 matched with the handle 100, the right end of the snap part 213 is in overlap joint with the trip protection mechanism 300, and the power part 215 of the trip button 210 extends to the lower side of the handle 100 towards the front surface to be matched with the power arm 130 of the handle 100; the top end of the connecting rod 220 is hinged with the handle 100, and the bottom end is connected with the movable contact 510 and the jump button 210 through the return spring 201.

As shown in fig. 1 and 15, in one embodiment of the trip button 210 of the operating mechanism, the trip button 210 is U-shaped, and includes a connection arm 212, and a pivot arm 211 and a snap part 213 respectively disposed at two ends of the connection arm 212, wherein the pivot arm 211 is hinged with the housing, the snap part 213 is used for snap-fitting with the trip protection mechanism 300, a power part 215 extending to the lower part of the handle 100 is disposed at the middle part of the connection arm 212, one end of the return spring 201 is connected with the power part 215, and the other end is connected with the connecting rod 220. Further, a link plate 216 that engages with the link 400 is provided on one end of the link arm 212 near the snap portion 213. The left side of the connecting arm 212 is provided with a jump buckle groove 214, the right side is provided with a linkage plate 216 matched with the linkage piece 400, the jump buckle groove 214 is provided with a power part 215 extending to the front below the handle 100, the right side of the power part 215 is matched with the handle 100, the left side of the power part 215 is connected with one end of a return spring 201, and the other end of the return spring 201 is connected with the bottom end of a connecting rod 220 arranged on the front side of the jump buckle 210.

As shown in fig. 1 and 16, an embodiment of a link 220 of an operating mechanism is shown, the link 220 is in a flat plate shape, the link 220 includes an articulated arm 221 hinged with a handle 100, and a contact arm 222 connected with the articulated arm 221, the articulated arm 221 and the contact arm 222 are connected in a V shape to form a space between the articulated arm 221 and the contact arm 222 for avoiding a linkage plate 216 on a trip button 210, an inwardly extending extension arm 2231 is provided on a side of an inner side of the contact arm 222, a spring hook 223 connected with a return spring 201 is provided on a side of the extension arm 2231, the contact arm 222 of the link 220 is fixedly connected with a moving contact 224 of copper, the moving contact 224 is provided with a moving contact 510, and the moving contact 224 is connected with a bimetal 320 of the trip protection mechanism 300 through a soft link 535, and the link 220 is preferably made of iron.

The handle 100 includes a pivot seat 110 pivotally mounted in the housing, and an operation arm 120 and a power arm 130 respectively fixedly connected to two ends of the pivot seat 110, wherein the pivot seat 110 is simultaneously hinged with the connecting rod 220, the operation arm 120 extends out of the housing for operation by a user, and a handle opening 1200 for limiting rotation of the handle 100 is provided on a side wall of the top side of the housing.

As shown in fig. 1 to 6, a limiting mechanism for limiting the trip button 210 and/or the handle 100 is further provided in the housing, when an external force is applied to the handle 100 during re-buckling, the handle 100 drives the trip button 210 to rotate through a power portion 215 of the trip button 210, when the trip button 210 and/or the handle 100 rotate to contact with the limiting mechanism, a safety re-buckling distance L is formed between a buckling portion 213 of the trip button 210 and a buckling surface of the trip protection mechanism 300, at this time, the external force applied to the handle 100 is released, so that the trip button 210 is driven by the return spring 201 to rotate and buckle on the buckling surface of the trip protection mechanism 300, re-buckling is completed, and a safety re-buckling distance L is formed between the buckling portion 213 of the trip button 210 and the buckling surface of the trip protection mechanism 300 through the limiting mechanism, so that the buckling portion 213 of the trip button 210 can smoothly buckle with the buckling surface of the trip protection mechanism 300 in the rotating process, and reliability of the circuit breaker can be improved.

As one embodiment of the limiting mechanism, the limiting mechanism includes a base rib 202 disposed in the housing and spaced from the trip button 210, and when the trip button 210 contacts the base rib 202 during the re-button, a safety re-button distance L is formed between the snap part 213 of the trip button 210 and the snap surface of the trip protection mechanism 300, and after the trip button 210 is re-fastened to the trip protection mechanism 300, the trip button 210 is separated from the base rib 202.

Further, the jump button 210 is U-shaped, and includes a connecting arm 212, and a pivot arm 211 and a buckle portion 213 respectively disposed opposite to two ends of the connecting arm 212, and the base rib 202 is disposed outside the pivot arm 211 to limit the rotation of the jump button 210. Specifically, the base rib 202 has a cuboid structure and is located between the left side of the pivoting arm 211 of the jump button 210 and the side wall of the shell, the shell is composed of a base and a cover, the shell is correspondingly provided with second screw holes 204 for connecting the base and the cover above and below the base rib 202, one end of the base rib 202 is connected with the side wall of the shell, and the other end is provided with a contact inclined plane 205 in abutting fit with the pivoting arm 211. The base rib 202 of the present embodiment can effectively use a limited space in the housing, and has the characteristics of compact structure and small occupied space. Of course, as other embodiments of the limiting mechanism (not shown in the drawings), the limiting mechanism may be disposed in the housing and cooperate with the connecting arm 212 or the snap portion 213, and the base rib 202 may be formed in other shapes, such as square, polygonal, etc., which are all within the scope of the present invention.

As another embodiment of the limiting mechanism, the limiting mechanism includes a handle opening 1200 provided on a side wall of the housing to limit rotation of the handle 100, the handle opening 1200 blocks the handle 100 when the handle 100 is rotated to the release position during re-buckling, and a safety re-buckling distance L is formed between the buckling portion 213 of the trip buckle 210 and the buckling surface of the trip protection mechanism 300 when the handle 100 contacts the side wall of the handle opening 1200. The handle opening 1200 is capable of blocking the handle 100 in place of the base rib 202 when the handle 100 is rotated toward the tripped position and creates a safe reclock distance L between the trip button 210 and the snap surface of the trip protection mechanism 300.

As shown in fig. 1, 3, 17 and 18, in yet another embodiment of the limiting mechanism, the limiting mechanism includes a handle opening 1200 and a base rib 202, the handle opening 1200 is matched with the base rib 202, and when the jump button 210 contacts with the base rib 202 during re-buckling, the power portion 215 of the jump button 210 limits the handle 100, and forms a preset spacing distance S between the handle 100 and the handle opening 1200. The connecting rod 220 is stacked with the jump button 210, and the connecting rod 220 is arranged above the front surface of the jump button 210, the power part 215 of the jump button 210 extends towards the front surface to be matched with the power arm 130 of the handle 100, and the power arm 130 of the handle 100 is positioned at one side of the power part 215 of the jump button 210, which is away from the base rib 202. When the jump button 210 contacts with the base rib 202, the jump button 210 prevents the operation arm 120 from contacting with the handle opening 1200 by blocking the power arm 130, and forms a predetermined spacing distance S between the operation arm 120 and the handle opening 1200. Specifically, the handle opening 1200 is provided with an abutting surface 1201 in contact with and matched with the operation arm 120 corresponding to one side of the closing position of the handle 100, and an avoidance surface 1202 arranged at intervals with the operation arm 120 corresponding to the other side of the opening position of the handle 100, wherein the abutting surface 1201 and the avoidance surface 1202 are both in a V shape, the inner sides of the abutting surface 1201 and the avoidance surface 1202 are respectively provided with an arc surface matched with the pivoting seat 110, the outer sides of the abutting surface 1201 and the avoidance surface 1202 are respectively provided with an inclined surface matched with the operation arm 120, and two sides of the pivoting seat 110 are respectively provided with shielding arms 140 matched with the inner edges of the abutting surface 1201 and the avoidance surface 1202 so as to improve the tightness in the shell.

If the power arm 130 of the handle 100 is not worn, when the handle 100 is pushed to rotate towards the closing direction, the handle 100 is limited at the closing position by abutting the contact surface 1201 on the operation arm 120 of the handle 100 after the handle is rotated to the closing position; when the push handle 100 rotates in the opening direction, the power arm 130 of the handle 100 pushes the latch 210 to rotate anticlockwise and drives the latch 213 to move upwards, the limiting mechanism is arranged in the anticlockwise rotation direction of the latch 210, when the latch 213 rises to the armature 340 to form a safety rebuckling distance L (fig. 4), the base rib 202 can stop the latch 210 from continuing to rotate upwards (fig. 3), the power arm 130 also abuts against the power portion 215 of the latch 210, so that the operating arm 120 cannot continue to rotate in the opening direction and a preset spacing distance S is formed between the operating arm 120 and the avoiding surface 1202 (fig. 18), the operating arm 120 of the handle 100 cannot contact with the avoiding surface 1202, the handle 100 is released again, and the return spring 201 pulls the latch 213 to move downwards to overlap the top side of the armature 340 to complete rebuckling (fig. 6).

If the power arm 130 of the handle 100 is worn, when the operating arm 120 moves to the preset spacing distance S, the trip button 210 cannot contact with the base rib 202, and the distance between the buckle part 213 and the armature 340 is also smaller than the safety rebuckling distance L, at this time, due to the preset spacing distance S, the operating arm 120 can continue to rotate toward the avoiding surface 1202 along the opening direction until the trip button 210 contacts with the base rib 202 again, and the buckle part 213 can also move to the safety rebuckling distance L on the armature 340 again, so as to prevent the situation that the trip button cannot be rebuckled and the product fails due to the wear of the handle 100.

It will be appreciated that if the distance between the latch 213 and the armature 340 is slightly smaller than the safety rebuckling distance L due to wear of the power arm 130, the latch can still be formed, but the handle opening 1200 and the base rib 202 on the housing are used to limit rotation of the operating arm 120 and the trip button 210, so that the latch 213 and the armature 340 can maintain the safety rebuckling distance L all the time to improve the reliability of the circuit breaker, and the limited space in the housing limits the safety rebuckling distance L, so that if the power arm 130 is worn further, the operating arm 120 can continue to rotate along the reserved spacing distance S to ensure that the latch 213 and the armature 340 rebuckle, so that the service life of the circuit breaker can be effectively prolonged without affecting the compactness of the circuit breaker, and if the power arm 130 of the handle 100 is worn further, the operating arm 120 is eventually brought into contact with the trip surface 1202.

If the breaker is to be switched on when the trip button 210 is buckled with the armature 340, the handle 100 is rotated to a switching-on position, the power arm 130 is rotated to a direction away from the power part 215, and the handle 100 drives the movable contact 510 to move to the stationary contact 520 through the connecting rod 220; if the trip 210 is to be separated from the breaker when the armature 340 is snapped, the operating arm 120 is rotated to the separating position, the power arm 130 is rotated to the direction approaching the power portion 215, and the handle 100 drives the moving contact to separate from the stationary contact 520 through the connecting rod 220;

If the circuit breaker trips during closing, the armature 340 moves rightward to trip the snap-in portion 213, the snap-in 210 drives the snap-in portion 213 to move downward under the action of the return spring 201, the snap-in 210 pulls the connecting rod 220 through the return spring 201 to drive the moving contact 224 to separate from the stationary contact 520, and simultaneously the connecting rod 220 drives the handle 100 to rotate to a trip position, and the power arm 130 is made to abut against the power portion 215.

If the trip button 210 is to be tripped (tripped) from the armature 340, the circuit breaker is to be closed, then the trip button is to be tripped, the operation arm 120 is rotated to the opening position during the trip button, the pivot seat 110 pushes the power portion 215 to drive the latch portion 213 to move upwards through the power arm 130, when the trip button 210 and/or the handle 100 are rotated to be in contact with the limiting mechanism, a safe trip distance L is formed between the latch portion 213 of the trip button 210 and the latch surface of the trip protection mechanism 300, and then the reset spring 201 pulls the latch portion 213 to move downwards to overlap the top side of the armature 340 by releasing the handle 100 to complete the trip button.

As shown in fig. 16 and 19-20, in one embodiment of the contact structure of the circuit breaker, the connecting rod 220 is in a flat sheet shape, and includes an articulated arm 221 articulated with the handle 100, and a contact arm 222 connected with the articulated arm 221, wherein the contact arm 222 is fixedly connected with a moving contact 224 of copper, the moving contact 224 is provided with a moving contact 510, and the moving contact 224 is connected with a bimetallic strip 320 of the trip protection mechanism 300 through a soft connection 535. Specifically, a moving contact 224 made of copper is arranged on the side surface of the back of the contact arm 222, the moving contact 224 is arranged in parallel with the connecting rod 220, a moving contact 510 is arranged on the side edge of the moving contact 224, the moving contact 510 is preferably made of silver, the side surface of one side of the moving contact 224 is fixedly connected with the contact arm 222, the side surface of the other side is connected with the bimetallic strip 320 through a soft connection 535, the moving contact 224 is additionally arranged on one side of the connecting rod 220, the moving contact 510 is arranged on the moving contact 224, and when the circuit breaker works, the current of a main circuit directly flows to the moving contact 510 through the moving contact 224, so that the problem of temperature rise inside the circuit breaker caused by the current passing through the connecting rod 220 can be avoided, and the circuit breaker has the characteristics of reducing the production cost and being convenient to assemble.

As shown in fig. 16 and 21, in the assembly structure of the handle 100 and the operating mechanism, the connecting rod 220 of the operating mechanism is connected with the handle 100 through a hinge shaft 226, and the handle 100 and the connecting rod 220 are hinged through the handle 100 and the connecting rod 220 through the hinge shaft 226. Specifically, the handle 100 includes a pivot base 110 pivotally mounted in a housing, and an operation arm 120 and a power arm 130 respectively disposed at both ends of the pivot base 110, the power arm 130 is engaged with a power portion 215 of the trip 210, the pivot base 110 is provided with a hinge groove 111 at a side close to the power arm 130, a hinge arm 221 of the link 220 extends into the hinge groove 111, and a hinge shaft 226 passes through a sidewall of the hinge groove 111 and the hinge arm 221 to hinge the handle 100 and the link 220.

As shown in the embodiment of fig. 16 and 21, the handle 100 includes two opposite power arms 130 disposed at intervals, the power portion 215 of the jump button 210 is simultaneously engaged with the two power arms 130, the pivoting portion 110 is provided with a hinge groove 111 for accommodating the hinge arm 221 on a circumference of one side close to the power arms 130, the two power arms 130 are respectively disposed on two side edges of the hinge groove 111 and respectively correspond to the front and rear sides of the link 220, the hinge arm 221 passes through the inner sides of the two power arms 130 to be connected with the side walls of the hinge groove 111 through the hinge shaft 226, the hinge arm 221 is provided with a hinge hole 225 interference-fitted with the hinge shaft 226, the hinge shaft 226 is extended from both ends of the hinge shaft 226, the side wall of one side of the hinge groove 111 is provided with a connecting counter bore 112 fitted with one end of the hinge shaft 226, the side wall of the other side is provided with a connecting through hole 113 fitted with the other end of the hinge shaft 226, and the width of the hinge groove 111 and the distance between the two power arms 130 should be greater than the thickness of the link 220.

When assembling, the connecting rod 220 can be put into the hinge groove 111, then the hinge shaft 226 is sequentially pushed into the connecting through hole 113, the hinge hole 225 and the connecting counter bore 112 through automatic equipment, and the connecting rod 220 and the handle 100 are assembled while the hinge shaft 226 and the hinge hole 225 form interference fit, so that the automatic assembling design is convenient. In addition, the trip buckle 210 is matched with the two power arms 130 through the power part 215, so that the transmission is more balanced and reliable, the wear resistance of the power arms 130 is better, the operation mechanism can be further prevented from being incapable of buckling due to the abrasion of the power arms 130, the service life of the circuit breaker is prolonged, and of course, only one side of the hinge groove 111 is provided with the power arm 130, and the other side is not provided with the power arm 130, which belongs to the protection scope of the invention.

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 disclosed herein. It should be understood that those skilled in the art to which the present invention pertains may make several simple deductions or substitutions without departing from the inventive concept, and should be considered as falling within the scope of the present invention.

Claims

1. A circuit breaker, characterized in that: the circuit breaker comprises circuit breaker units which are arranged in parallel in multiple poles and a linkage shaft (450) connected among the circuit breaker units, wherein the circuit breaker units comprise a handle (100), a movable contact (510), a fixed contact, an operating mechanism which is arranged in a shell and drives the movable contact (510) to contact and separate from the fixed contact, a tripping protection mechanism (300) and a linkage piece (400) connected with the linkage shaft (450), the linkage piece (400) is positioned between the operating mechanism and the tripping protection mechanism (300), one side of the linkage piece (400) is provided with a pushing part (430) matched with the tripping protection mechanism (300), and the other side of the linkage piece (400) is provided with a linkage part (440) matched with the operating mechanism; when any circuit breaker unit trips, an operating mechanism in the circuit breaker unit pushes a linkage part (440) of a linkage piece (400), the linkage piece (400) drives the linkage pieces (400) in other circuit breaker units to rotate through a linkage shaft (450), and the linkage pieces (400) in other circuit breaker units trigger a tripping protection mechanism (300) in other circuit breaker units to trip through a pushing part (430).

2. The circuit breaker according to claim 1, characterized in that: the pushing part (430) and the linkage part (440) of the linkage piece (400) are positioned on the same plane.

3. A circuit breaker according to claim 1 or 2, characterized in that: the operating mechanism comprises a trip button (210) which is in snap fit with the trip protection mechanism (300), and a connecting rod (220) which is arranged above the trip button (210) in a stacking way; the linkage part (440) of the linkage piece (400) is overlapped above the front surface of the connecting rod (220), and the trip button (210) is provided with a linkage plate (216) which extends to one side of the connecting rod (220) towards the front surface and is matched with the linkage part (440).

4. A circuit breaker according to claim 1 or 2, characterized in that: the tripping protection mechanism (300) comprises a bimetallic strip (320), wherein a fixed end (321) of the bimetallic strip (320) is positioned at one end, close to the handle (100), in the shell, and a swinging end (322) of the bimetallic strip (320), which is bent by heating, is positioned at one end, close to the movable contact (510), in the shell, and the swinging end (322) is connected with the movable contact (510) through a soft connection (535).

5. The circuit breaker according to claim 1, characterized in that: the circuit breaker unit further comprises an indication plate (422) connected with the linkage piece (400), an indication opening (4200) matched with the indication plate (422) is formed in the shell of the circuit breaker unit, and an indication mark (421) is arranged in the indication opening (4200).

6. The circuit breaker according to claim 1, characterized in that: the quick tripping device further comprises a quick tripping part (420) which is connected with the linkage piece (400) and extends out of the shell of the circuit breaker unit, and the quick tripping part (420) can drive the linkage shaft (450) to rotate and trigger the tripping protection mechanism (300) to release the snap fit with the operating mechanism through the pushing part (430).

7. The circuit breaker according to claim 1, characterized in that: the linkage piece (400) comprises a linkage assembly part (410) arranged on a linkage shaft (450), one end of the linkage assembly part (410) is provided with a quick tripping part (420) extending out of a shell of the circuit breaker unit, and the other end of the linkage assembly part is provided with a pushing part (430); an indication board (422) is arranged on the quick release part (420); the end of the pushing part (430) is provided with a pushing cambered surface (433) matched with the armature (340), one side of the pushing part (430) is provided with a linkage part (440) matched with the jump button (210), the linkage part (440) is of a V-shaped hollow structure, the V-shaped hollow structure comprises a first supporting rod (441) connected with one end of the pushing part (430) and a second supporting rod (442) connected with the other end of the pushing part (430), and the first supporting rod (441) is connected with the second supporting rod (442) in a V shape.

8. The circuit breaker of claim 4, wherein: the tripping protection mechanism (300) comprises a bimetallic strip (320) and an armature (340) which is in snap fit with the operating mechanism, a pole shoe (330) which is arranged on the bimetallic strip (320) at intervals with the armature (340), a spring piece (311) which is connected with one end of the bimetallic strip (320) is arranged at one end of the armature (340), a connecting piece (313) which is matched with the bimetallic strip (320) is arranged at the other end of the armature, the bimetallic strip (320) is bent and drives the armature (340) to release the snap fit with the operating mechanism through the connecting piece (313), and the electromagnetic force of the pole shoe (330) attracts the armature (340) to release the snap fit with the operating mechanism when in short circuit.

9. A circuit breaker according to claim 3, characterized in that: the operating mechanism comprises a connecting rod (220) and a jump buckle (210), one end of the connecting rod (220) is connected with the handle (100), and the other end is connected with the movable contact (510); the trip button (210) is pivotally mounted in the housing, the trip button (210) is provided with a snap part (213) in lap joint with the trip protection mechanism (300) and a power part (215) in cooperation with the handle (100), and is connected with the connecting rod (220) through a return spring (201).

10. The circuit breaker according to claim 9, characterized in that: the trip buckle (210) is U-shaped and comprises a pivoting arm (211) hinged with the shell, a buckle part (213) in snap fit with the trip protection mechanism (300) and a connecting arm (212) connected between the pivoting arm (211) and the buckle part (213), wherein a power part (215) matched with the handle (100) and a linkage plate (216) matched with a linkage part (440) of the linkage piece (400) are arranged on the connecting arm (212), the power part (215) is connected with the connecting rod (220) through a reset spring (201), and the linkage plate (216) and the trip protection mechanism (300) are respectively positioned on two sides of the linkage piece (400).