CN117954285A

CN117954285A - Operating mechanism of circuit breaker and circuit breaker

Info

Publication number: CN117954285A
Application number: CN202211283727.6A
Authority: CN
Inventors: 陆登宇; 敖登贵; 徐永富
Original assignee: Shanghai Chint Intelligent Technology Co Ltd
Current assignee: Shanghai Chint Intelligent Technology Co Ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2024-04-30
Also published as: WO2024083052A1

Abstract

The invention relates to the field of a low-voltage electrical appliance, in particular to an operating mechanism of a circuit breaker, which comprises a bracket, a rocker arm assembly, a jump buckle part, a locking buckle part and a re-buckle part which are respectively arranged on the bracket in a rotating way, a first crank, an energy storage spring, a sliding rail, a sliding block, a first connecting rod, a second crank which is arranged in a rotating way around a sixth center, a third connecting rod and a third crank which is arranged in a rotating way around a seventh center, wherein the third crank is positioned at one side of the operating mechanism in the horizontal direction of the operating mechanism; the operating mechanism can be switched between three working states without connecting a contact system, and the layout of the contact system can be changed to provide a larger installation space for the arc extinguishing chamber.

Description

Operating mechanism of circuit breaker and circuit breaker

Technical Field

The invention relates to the field of piezoelectric devices, in particular to an operating mechanism of a circuit breaker and the circuit breaker comprising the operating mechanism.

Background

With the continuous development of photovoltaic technology, the performance requirements of a power distribution system on the molded case circuit breaker are gradually improved, and the molded case circuit breaker products are promoted to continuously develop towards the directions of small volume and high performance.

In order to meet the high-voltage breaking requirement of the molded case circuit breaker with two poles of DC1000V, DC V in a photovoltaic distribution line, the arc voltage of an arc extinguishing chamber is often increased to meet the requirement; the operating mechanism of the traditional 250A-specification molded case circuit breaker is of a four-five-link switching structure, and the operating mechanism and the rotating shaft of the moving contact mechanism are arranged at positions along the vertical direction of the operating mechanism, so that the arc extinguishing chamber can only be positioned at one side of the moving contact mechanism in the horizontal direction, and meanwhile, the size of the arc extinguishing chamber cannot be greatly increased due to the fact that the product outline size is limited, and the arc voltage of the arc extinguishing chamber is difficult to obviously promote; in the operating mechanism of the existing molded case circuit breaker, the relevance among all the components is high, on the premise of meeting other parameters, the matching size among all the connecting rods is inconvenient to adjust to increase the opening distance between the moving contact and the fixed contact, and the large-size arc extinguishing chamber cannot be matched.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides an operating mechanism of a circuit breaker, which can be switched between three working states without connecting a contact system, can change the layout of the contact system and provides a larger installation space for an arc extinguishing chamber; also provided is a circuit breaker including the operating mechanism, which has good arc extinguishing performance.

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

The operating mechanism of the circuit breaker comprises a bracket, a rocker arm assembly, a jump buckle piece, a locking buckle piece and a re-buckle piece which are respectively arranged on the bracket in a rotating way, a first crank, an energy storage spring, a sliding rail, a sliding block, a first connecting rod, a second connecting rod and a second crank which are fixedly arranged relative to the bracket, wherein the second crank is arranged around a sixth center in a rotating way; the locking piece is in snap fit with the jump piece and is in limit fit with the re-locking piece; one end of the first crank is rotatably arranged on the jump fastener around the eighth center, the other end of the first crank is rotatably connected with one end of the first connecting rod and one end of the energy storage spring around the tenth center, the other end of the energy storage spring is connected with the rocker arm assembly, the other end of the first connecting rod is rotatably connected with the sliding block, the sliding block is slidably arranged on the sliding rail, one end of the second connecting rod is rotatably connected with the sliding block, and the other end of the second connecting rod is rotatably connected with the second crank around the eleventh center to drive the second crank to rotate; the sliding rail is in limit fit with the sliding block to prevent the sliding block from sliding under the brake-separating or tripping state of the operating mechanism; the operating mechanism further comprises a third connecting rod and a third crank which is rotatably arranged around a seventh center, one end of the second crank is rotatably connected with one end of the third connecting rod around an eleventh center, and the other end of the third connecting rod is rotatably connected with the third crank around a twelfth center so as to drive the third crank to rotate; the rocker arm assembly and the second crank are respectively positioned at two ends of the operating mechanism in the vertical direction of the operating mechanism, and the third crank is positioned at one side of the operating mechanism in the horizontal direction of the operating mechanism.

Preferably, the sixth center, the seventh center, the eleventh center and the twelfth center are arranged in parallel at intervals and are positioned at four vertexes of one quadrangle; the second crank is rotatably arranged on the bracket around a sixth center, and the third crank is rotatably arranged on the bracket around a seventh center.

Preferably, the bracket is provided with a second crank guide hole, the second crank is rotationally connected with the third connecting rod through an eleventh shaft, the eleventh shaft is inserted in the second crank guide hole, and the shape of the second crank guide hole is matched with the movement track of the eleventh shaft;

And/or the bracket is provided with a third crank guide hole, the third connecting rod is rotationally connected with the third crank through a twelfth shaft, the twelfth shaft is inserted into the third crank guide hole, and the shape of the third crank guide hole is matched with the movement track of the twelfth shaft.

Preferably, the second crank is in a bar-shaped plate structure, one end of the second crank is rotatably arranged around a sixth center, and the other end of the second crank is rotatably connected with the third connecting rod and the second connecting rod around an eleventh center.

Preferably, the third crank is of a triangle plate structure, the first vertex angle is rotatably arranged around a seventh center, the second vertex angle is rotatably connected with the third connecting rod around a twelfth center, and the third vertex angle is rotatably connected with a moving contact mechanism of the circuit breaker.

Preferably, the third crank is an obtuse triangle plate structure, and the first vertex angle of the third crank is an obtuse angle.

Preferably, the support includes two support curb plates that relative interval set up, every support curb plate all includes the curb plate first portion and the curb plate second portion that link to each other, rocking arm subassembly, jump fastener, latch fastener, refastening piece and second crank rotate respectively and set up in the curb plate first portion, the first vertical on-direction both ends of curb plate set up V type groove and slide rail respectively, the curb plate second portion links to each other with the one end in the horizontal direction of the first portion of curb plate, rocking arm subassembly swings in the V type groove and sets up, the third crank rotates and sets up in the curb plate second portion.

Preferably, the sliding rail is of a groove-shaped structure or a hole-shaped structure.

Preferably, the sliding rail is arranged on the bracket.

Preferably, the operating mechanism further comprises a first traction rod and a transmission trip button which are in snap fit and respectively and rotatably arranged, the transmission trip button is driven to rotate when a circuit where the circuit breaker is located is in a short circuit and/or overload fault, the snap fit with the first traction rod is released, and the first traction rod rotates to drive the operating mechanism to trip.

Preferably, the operating mechanism further comprises a thermomagnetic tripping mechanism, and the thermomagnetic tripping mechanism drives the first traction rod to rotate to release the snap fit with the transmission tripping buckle when the circuit breaker has short circuit and overload faults.

Preferably, when the circuit of the circuit breaker has a short circuit fault, the first traction rod is driven by the moving contact of the circuit breaker to release the snap fit with the transmission trip buckle.

Preferably, the operating mechanism further comprises a test button which is arranged in a sliding manner, the test button is driven by external force to slide, and the test button drives the first traction rod to act so as to release the snap fit with the transmission jump buckle.

Preferably, when the operating mechanism is rebuckled from the tripping and separating brake state, the rocker arm component of the operating mechanism drives the transmission tripping buckle to reset and restore to be in snap fit with the first traction rod.

The breaker comprises an operating mechanism of the breaker and at least one group of breaking units, wherein the breaking units comprise a contact system and an arc extinguishing chamber, the contact system comprises a moving contact mechanism and a fixed contact which are matched for use, the moving contact mechanism comprises a contact support and a moving contact which is arranged on the contact support in a rotating way around a seventh center, the contact support is connected with a third crank in a driving way, and the rocker arm assembly, the second crank and the arc extinguishing chamber are sequentially arranged along the vertical direction of the operating mechanism.

In the operating mechanism, the sliding rail provides a guide function for the sliding block and also serves as a supporting point to provide supporting force for the first connecting rod and the sliding block, so that the operating mechanism has a stable closing position, a stable opening position and a stable tripping position under the condition that the operating mechanism is not connected with a moving contact mechanism of a breaking unit, the operating mechanism is made to be an independently operable component, the modularized assembly and production of the operating mechanism are facilitated, and the operating mechanism is distributed in a breaker with more design space; in addition, in actual production, the operating mechanism does not need to be matched with a moving contact mechanism of the breaking unit, so that the loss of a contact system of the breaking unit in the test process is avoided, and the research and development and production costs are reduced; in addition, the third crank of the operating mechanism is used for being connected with the driving of the moving contact mechanism of the circuit breaker, so that the moving contact mechanism and the operating mechanism are arranged side by side in the horizontal direction of the operating mechanism, more space for arranging the arc extinguishing chamber is provided on one side of the operating mechanism in the vertical direction, the arc extinguishing chamber with larger specification and better arc extinguishing performance is arranged, and the arc extinguishing performance and breaking performance of the circuit breaker are improved.

In addition, the operating mechanism is buckled again, and meanwhile, the transmission jumping buckle is driven to reset to restore the snap fit with the first traction rod, so that the reliable reset of the transmission jumping buckle and the first traction rod is ensured, and the operation mechanism is ready for the next tripping brake.

The circuit breaker comprises the operating mechanism, and has good arc extinguishing performance.

Drawings

Fig. 1 is a schematic structural view of a circuit breaker in a closing state of the present invention, showing a quick trip and a test button;

Fig. 2 is a schematic diagram of a breaking unit structure in a closed state of the present invention;

Fig. 3 is a schematic structural view of a breaking unit of the present invention, wherein an electric repulsive force between a movable contact and a fixed contact is repelled to drive a first transmission structure to rotate;

fig. 4a is a schematic structural view of the circuit breaker in the closing state of the present invention, showing the cooperation relationship between the operating mechanism and the moving contact mechanism of the breaking unit;

FIG. 4b is a schematic view of the operating mechanism in the closed state according to the present invention;

fig. 5a is a schematic view of a circuit breaker in a tripped open state according to the invention;

Fig. 5b is a schematic perspective view of a circuit breaker in a trip open state according to the present invention;

FIG. 5c is a schematic structural view of the operating mechanism in the trip open state of the present invention, showing the mating relationship of the first drawbar and the thermo-magnetic release;

fig. 6 is a schematic structural view of the circuit breaker during the rebuckling process of the present invention;

FIG. 7 is a schematic view of a first transmission structure of the present invention;

FIG. 8 is a schematic view of the construction of the primary pushrod of the present invention;

FIG. 9 is a schematic view of the structure of the secondary pushrod of the present invention;

FIG. 10 is a schematic view of the construction of the first drawbar of the present invention;

FIG. 11 is a schematic view of the structure of the transmission trip buckle of the present invention;

Fig. 12 is a schematic structural view of a second drawbar of the invention.

Description of the reference numerals

A first center 1S; a second center 2S; a third center 3S; a fourth center 4S; a fifth center 5S; a sixth center 6S; a seventh center 7S; an eighth center 8S; a ninth center 9S; a tenth center 10S; an eleventh center 11S; a twelfth center 12S; a first connecting shaft 1a; a rocker arm driving section 2a; a buckle structure 3a; a second connecting shaft 1b; a third connecting shaft 1c; a bracket 1; 1-0 parts of slide rail; a second crank guide hole 1-1; a third crank guide hole 1-2; an energy storage spring 4; a handle 2; a rocker arm 3; a reset structure 6; a jump fastener 7; a slider shaft 8; a refastening member 9; a catch piece 10; a torsion spring 11 is matched; a breaking unit case 12; a first crank 14; a crank limit part 15; a first link 16; a slider 18; a second link 19; a second crank 22; a third link 23; a test button elastic reset member 24; a third crank 25; a drive shaft 28; a drive trip 32; the transmission trip buckle pivot end 32-0; a driving surface 32-1 for the transmission trip button; the transmission jump buckle end 32-2; snap end hooks 32-20; a transmission trip button driven part 32-3; a first drawbar 34; a first drawbar body 34-0; first drawbar axle bore 34-00; a first drawbar receiver 34-1; a first drawbar buckle arm 34-2; snap arm hooks 34-20; a first drawbar coupler arm 34-3; a first drawbar spring arm 34-4; a first drawbar return spring 36; a contact support 40; a moving contact 41; a stationary contact 42; a first transmission structure 43; a first transmission structure mounting portion 43-0; first transmission structure shaft hole 43-00; a first transmission structure driven part 43-1; the first transmission structure drives the arm 43-2; a primary pushrod 44; primary pusher arm 44-0; a primary push rod shaft 44-1; a first-stage pushrod shaft connection 44-10; a secondary push rod 45; a secondary push rod arm 45-0; a secondary pusher arm connecting hole 45-00; a secondary push rod shaft 45-1; a test button 46; a contact spring 47; contact spring first end 47-0; a contact spring body 47-1; a contact spring second end 47-2; a first mounting shaft 48-0; a second mounting shaft 48-1; a second drawbar 49; a second drawbar body 49-0; a second drawbar connecting arm 49-1; a second lever armature opposing arm 49-2; a second drawbar double-gold mating arm 49-3; armature transmission member 50; a bimetal element 51; a first hinge shaft 52-1; a second hinge shaft 52-2; a thermo-magnetic trip armature 53; a thermo-magnetic trip yoke 54; a connecting rod 55; a first hinge shaft 55-0; a second hinge shaft 55-1; a second tow bar shaft 56; a first tow bar shaft 58; a transmission trip elastic member 60; a transmission trip shaft 61; a torsion spring limit shaft 62; a rocker arm rotation shaft 85; a crank trip hinge shaft 86; a four bar linkage 97; an eleventh shaft 2223; and a twelfth axis 2325.

Detailed Description

Embodiments of the circuit breaker of the present invention are further described below with reference to the examples shown in fig. 1-12. The circuit breaker of the present invention is not limited to the description of the following embodiments.

The circuit breaker of the present invention is preferably a circuit breaker with an energy storage operating mechanism, such as a molded case circuit breaker.

As shown in fig. 1-6, the circuit breaker of the invention comprises an operating mechanism and at least one group of breaking units, wherein the operating mechanism is in driving connection with the breaking units to drive the breaking units to be closed or opened so as to enable the circuit breaker to be closed or opened. Further, the breaking unit comprises a contact system, the contact system comprises a moving contact mechanism and a fixed contact which are matched, and the moving contact mechanism comprises a contact support 40 which is rotatably arranged and a moving contact 41 which is arranged on the contact support 40.

The circuit breaker preferably comprises a plurality of groups of breaking units, wherein the moving contact mechanisms of the breaking units are arranged side by side and coaxially rotate, and are connected with the operating mechanism in a driving way to be synchronously closed or opened.

As shown in fig. 1, 4a-6, is one embodiment of the operating mechanism.

The operating mechanism has three working states, namely a brake-separating state, a brake-closing state and a tripping state (tripping brake-separating state), and is switched to the brake-separating state through rebuckling in the tripping state.

As shown in fig. 1 and 4a-6, the operating mechanism comprises a bracket 1, a rocker arm assembly, a jump fastener 7, a lock fastener 10 and a re-fastener 9 which are respectively rotatably arranged on the bracket 1, a first crank 14, an energy storage spring 4, a sliding rail 1-0 fixedly arranged relative to the bracket 1, a sliding block 18, a first connecting rod 16 and a second crank 22 rotatably arranged around a sixth center 6S; the locking piece 10 is in snap fit with the jump buckle piece 7 and is in limit fit with the re-buckle piece 9; one end of the first crank 14 is rotatably arranged on the jump fastener 7 around the eighth center 8S, the other end of the first crank is rotatably connected with one end of the first connecting rod 16, one end of the energy storage spring 4 is rotatably connected with the tenth center 10S, the other end of the energy storage spring 4 is connected with the rocker arm assembly, the other end of the first connecting rod 16 is rotatably connected with the sliding block 18, and the sliding block 18 is slidably arranged on the sliding rail 1-0; the sliding rail 1-0 is in limit fit with the sliding block 18 to prevent the sliding block 18 from sliding in the opening or releasing state of the operating mechanism. The sliding block 18 converts the position change of the opening and closing movement of the first connecting rod 16 into the displacement of the sliding block 18, so that the actual measurement and the adjustment of parameters such as the structural size connected with the sliding block 18 are facilitated, the conversion of the mechanism connecting rod and the transmission of the torque can be realized through the first crank 14, the first connecting rod 16 and the sliding block 18, the opening, closing and releasing operation of the operating mechanism can be realized without connecting a rotating shaft (namely a moving contact mechanism), and the modularized production of the operating mechanism is facilitated. That is, in the operating mechanism, the sliding rail 1-0 provides the guiding function for the sliding block 18 and also serves as a supporting point to provide supporting force for the first connecting rod 16 and the sliding block 18, so that the operating mechanism has a stable closing position, a breaking position and a tripping position under the condition that the operating mechanism is not connected with the moving contact mechanism of the breaking unit, the operating mechanism is made into an independently operable component, the modular assembly and production of the operating mechanism are facilitated, and the distribution of the operating mechanism in the circuit breaker has more design space; in addition, in actual production, the operating mechanism does not need to be matched with the moving contact mechanism of the breaking unit, so that the loss of a contact system of the breaking unit in the test process is avoided, and the research and development cost and the production cost are reduced.

Further, in this embodiment, the latch 7 is rotatably disposed on the bracket 1 around the first center 1S, the latch 10 is rotatably disposed on the bracket 1 around the second center 2S, the latch 9 is rotatably disposed on the bracket 1 around the third center 3S, and the rocker arm assembly is rotatably disposed on the bracket 1 around the fourth center 4S.

As shown in fig. 1 and fig. 4a-5c, the snap fastener 7 is rotatably disposed on the bracket 1 through a snap fastener shaft, the snap fastener 10 is rotatably disposed on the bracket 1 through a snap fastener shaft, and the re-fastener 9 is rotatably disposed on the bracket 1 through a re-snap fastener shaft.

As shown in fig. 1 and 4a-6, the sliding rail 1-0 is preferably an elongated straight hole provided on the bracket 1, in which the slider 18 reciprocates in its extending direction. Further, one end of the long straight hole is open, and the other end is closed and is the opening position of the sliding block 18. It should be noted that the sliding rail 1-0 may also be provided not on the bracket 1 but on a support structure independent of the operating mechanism, for example on a housing structure for accommodating the operating mechanism or on a housing of the breaking unit (the housing of the breaking unit is called breaking unit housing 12, as shown in fig. 2).

As shown in fig. 1 and 4a-6, the rocker arm assembly comprises a handle 2, a rocker arm 3 and a reset structure 6 for driving the snap fastener 7 and the snap fastener 10 to be re-fastened, wherein the rocker arm 3 is rotatably arranged on the bracket 1 around a fourth center 4S (as shown in fig. 5c, the rocker arm 3 is preferably rotatably arranged on the bracket 1 through a rocker arm rotating shaft 85), and the rocker arm 3 is respectively in limit fit with the bracket 1 at two ends of the swinging stroke. Furthermore, the reset structure 6 is a reset shaft arranged on the rocker arm 3 (two ends of the reset shaft are fixedly connected with two rocker arm supporting legs of the rocker arm 3 respectively), the jump fastener 7 is in a strip structure, one end of the jump fastener is in snap fit with the lock fastener 10, and the other end of the jump fastener is rotatably arranged on the bracket 1; in the release state, the rocker arm assembly swings in the release direction to drive the jump fastener 7 to rotate through the reset structure 6 and to rebuckle with the lock fastener 10 (that is, the two recover the snap fit), and the lock fastener 10 and the rebuckle 9 recover the limit fit.

As shown in fig. 1 and 4a-6, the bracket 1 is provided with a V-shaped groove, and the rocker arm 3 is respectively in limit fit with two side walls of the V-shaped groove at two ends of the swing stroke.

As shown in fig. 1, 4b, and 5a, the first crank 14 has a triangle structure, a first vertex thereof is rotatably disposed on the jump fastener 7 around the eighth center 8S (the first vertex is preferably rotatably connected to the jump fastener 7 through a crank jump hinge shaft 86), a second vertex thereof is rotatably connected to one end of the first connecting rod 16 and one end of the energy storage spring 4 around the tenth center 10S, and a third vertex thereof is provided with a crank limiting portion 15. Further, the operating mechanism comprises two first cranks 14 which are symmetrically arranged at two sides of the jump fastener 7 and fixedly connected, and the two first cranks 14 synchronously act.

As shown in fig. 1 and 4b, the operating mechanism further comprises a mating torsion spring 11, and the mating torsion spring 11 is respectively matched with the re-fastening member 9 and the locking member 10, so that the re-fastening member 9 and the locking member 10 are kept in limit fit.

As shown in fig. 1 and 4a-6, the operating mechanism further comprises a second connecting rod 19, a second crank 22 rotatably arranged around a sixth center 6S, a third connecting rod 23 and a third crank 25 rotatably arranged around a seventh center 7S, one end of the second connecting rod 19 is rotatably connected with the sliding block 18, the other end is rotatably connected with the second crank 22 around an eleventh center 11S to drive rotation thereof, one ends of the second crank 22 and the third connecting rod 23 are rotatably connected with the eleventh center 11S, the other end of the third connecting rod 23 is rotatably connected with the third crank 25 around a twelfth center 12S to drive rotation thereof, and the third crank 25 is used for driving connection with a moving contact mechanism of the breaking unit; the rocker arm assembly and the second crank 22 are respectively positioned at two ends of the operating mechanism in the vertical direction, and the third crank 25 is positioned at one side of the operating mechanism in the horizontal direction. Further, the third crank 25 is in driving connection with the moving contact mechanism through a driving shaft 28, and a driving shaft avoiding hole matched with the moving track of the driving shaft 28 is preferably formed in the shell of the breaking unit. The third crank 25 of the operating mechanism is used for being connected with the driving of the moving contact mechanism of the circuit breaker, so that the moving contact mechanism and the operating mechanism are arranged side by side in the horizontal direction of the operating mechanism, more space for arranging the arc extinguishing chamber is provided on one side of the operating mechanism in the vertical direction, the arc extinguishing chamber with larger specification and better arc extinguishing performance is arranged, and the arc extinguishing performance and breaking performance of the circuit breaker are improved.

The operating mechanism of the circuit breaker is improved on the basis of the existing four-five connecting rod conversion structure, the rotating centers of the operating mechanism and the moving contact mechanism are arranged on the same horizontal line (namely, the operating mechanism and the moving contact mechanism are arranged side by side along the horizontal direction of the operating mechanism), one crank-slider structure (formed by a first crank 14, a first connecting rod 16 and a slider 18) and one four-connecting rod structure (formed by a second crank 22, a third connecting rod 23 and a third crank 25) are added on the premise that the operating mechanism can reliably open, close and release, and the four-connecting rod structure 97 is formed by a second crank 22, a third connecting rod 23 and a third crank 25, so that the opening and closing actions of the operating mechanism and the moving contact mechanism of the 2P and 3P circuit breaker are realized, more design spaces are reserved for an arc-extinguishing chamber, and finally the horizontal arc-extinguishing chamber design of the circuit breaker can be realized.

As shown in fig. 1, 4a-5a, 6, the sixth center 6S, the seventh center 7S, the eleventh center 11S, and the twelfth center 12S are disposed in parallel at intervals and at four vertexes of one quadrangle.

As shown in fig. 1, 4b-5a, the second crank 22 is preferably rotatably arranged on the bracket 1 about a sixth center 6S. Further, the second crank 22 is an elongated plate structure, one end of which is rotatably disposed on the bracket 1 around the sixth center 6S, and the other end of which is rotatably connected to the third link 23 around the eleventh center 11S. It should be noted that the second crank 22 may also be provided not on the bracket 1 but on a housing structure for operating mechanism independent, for example: on the housing structure for accommodating the operating mechanism 1 or on the housing of the breaking unit.

As shown in fig. 5b, the bracket 1 is preferably provided with a second crank guiding hole 1-1, the second crank 22 is preferably rotatably connected with the third connecting rod 23 through an eleventh shaft 2223, the eleventh shaft 2223 is inserted into the second crank guiding hole 1-1, the shape of the second crank guiding hole 1-1 is matched with the movement track of the eleventh shaft 2223, and the second crank guiding hole 1-1 is an arc hole.

As shown in fig. 1, 4b-5a, the third crank 25 is preferably rotatably arranged on the bracket 1 about a seventh center 7S. It should be noted that the third crank 25 may also be provided not on the bracket 1 but on a housing structure for operating mechanism independent, for example: on the housing structure for accommodating the operating mechanism 1 or on the housing of the breaking unit.

As shown in fig. 1 and 4b-5a, the third crank 25 is in a triangle structure, the first vertex angle is rotatably disposed on the bracket 1 around the seventh center 7S, the second vertex angle is rotatably connected with the third connecting rod 23 around the twelfth center 12S, and the third vertex angle is rotatably connected with the moving contact mechanism of the breaking unit to drive the moving contact mechanism to rotate. Further, the third crank 25 is an obtuse triangle board structure, and the first vertex angle is an obtuse angle.

As shown in fig. 1 and 4a-4b, the bracket 1 is preferably provided with a third crank guiding hole 1-2, the third connecting rod 23 is preferably rotatably connected with the third crank 25 through a twelfth shaft 2325, the twelfth shaft 2325 is inserted into the third crank guiding hole 1-2, the shape of the third crank guiding hole 1-2 is matched with the movement track of the twelfth shaft 2325, and the third crank guiding hole 1-2 is an arc-shaped hole.

The following will be specific to the switching process of the operating mechanism between the opening state, the closing state and the releasing state, as shown in fig. 1, 4a-5a and 6:

As shown in fig. 1, 4a-5a and 6, two ends of the swing stroke of the rocker arm 3 of the rocker arm assembly are respectively a first stroke end and a second stroke end, two ends of the energy storage spring 4 are respectively a first energy storage spring end and a second energy storage spring end, and the two ends of the energy storage spring 4 are respectively connected with the rocker arm assembly (the first energy storage spring end is preferably connected with the rocker arm 3) and the first crank 14. Specifically, as shown in fig. 1, 4a-5a and 6, the first end and the second end of the stroke of the rocker arm 3 are respectively the right end and the left end of the swing stroke of the rocker arm 3, the upper end of the energy storage spring 4 is the first end of the energy storage spring, and the lower end is the second end of the energy storage spring.

Referring to fig. 1 and 4a-4b, the operation process of switching the operating mechanism from the closing state to the opening state is as follows:

As shown in fig. 1 and 4a-4b, the operating mechanism is in a closing state, at this time, the rocker arm 3 swings towards the second end of the stroke and drives the first end of the energy storage spring to rotate around the second end of the energy storage spring, the energy storage spring 4 is maximum when reaching the first dead point position, the energy storage spring 4 rotates past the first dead point position, the energy storage spring 4 releases energy to drive the first crank 14 to rotate towards the second direction and drive the rocker arm 3 to swing towards the second end of the stroke, the first crank 14 drives the sliding block 18 to slide from the closing position to the opening position along the sliding rail 1-0 through the first connecting rod 16, the sliding block 18 is in limit fit with the sliding rail 1-0 at the closing position to prevent the sliding block 18 from sliding further, meanwhile, the sliding block 18 drives the second crank 22 to rotate towards the second direction, the second crank 22 drives the third crank 25 to rotate towards the second direction through the second connecting rod 19, and the third crank 25 drives the moving contact mechanism to rotate towards the second direction to break the corresponding fixed contact 42. Specifically, as shown in fig. 1 and 4a-4b, when the operating mechanism is switched from the closing position to the opening position, the sliding block 18 moves upward along the sliding rail 1-0 until the sliding block 18 moves to the upper end of the sliding rail 1-0 (i.e., the closing position of the sliding block 18) to be in limit fit with the sliding block to prevent the sliding block 18 from further sliding, and the second direction is a counterclockwise direction; the axis of the energy storage spring 4 is a first axis, when the energy storage spring 4 is located at the first dead point position, the energy storage of the energy storage spring 4 reaches the maximum value, the eighth center 8S is located on the first axis, and when the energy storage spring 4 rotates around the second end of the energy storage spring to pass through the first dead point position, the first axis rotates through the eighth center 8S, so that the eighth center 8S can be regarded as the first dead point position, that is, the first axis of the energy storage spring 4 rotates through the eighth center 8S, that is, the energy storage spring 4 rotates through the first dead point position.

The action process of switching the operating mechanism from the opening state to the closing state is as follows:

When the operating mechanism 100 is in a brake-separating state, the rocker arm 3 swings towards a first stroke end and drives the first end of the energy storage spring 4 to rotate around the second end of the energy storage spring until the energy storage spring 4 rotates to a first dead point position, the energy storage spring 4 drives the first crank 14 to rotate towards a first direction to enable the crank limiting part 15 to be in limiting fit with the jump fastener 7 so as to prevent the first crank 14 from rotating towards the first direction, meanwhile, the energy storage spring 4 drives the rocker arm 3 to swing to the first stroke end, the first crank 14 drives the sliding block 18 to slide towards a brake-separating position from a brake-closing position along the sliding rail 1-0 through the first connecting rod 16, the sliding block 18 drives the second crank 22 to rotate towards the first direction through the second connecting rod 19, the second crank 22 drives the third crank 25 to rotate towards the first direction through the third connecting rod 23, and the third crank 25 drives the moving contact mechanism to rotate towards a closing direction so as to be closed with the corresponding fixed contact 42; the first direction and the second direction are opposite to each other. Specifically, when the operating mechanism is switched from the opening state to the closing state, the sliding block 18 moves downwards along the sliding rail 1-0 to the closing position; the first direction is clockwise.

As shown in fig. 1 and 4a-5a, the process of switching the operating mechanism from the closing state to the releasing state (i.e. the trip opening state) is as follows:

As shown in fig. 1 and 4a-4b, when the operating mechanism is in a closing state, an external force (such as a force applied to the rebuckles 9 by a transmission trip 32 described below) drives the rebuckles 9 to rotate and release the limit fit with the lock catch members 10, the lock catch members 10 rotate and release the lock fit with the trip members 7, under the action of the energy storage spring 4, the rocker arm of the rocker arm assembly swings towards the second end of the stroke, the trip members 7 rotate towards the second direction and drive the first crank 14 to synchronously rotate until the trip members 7 are in limit fit with the reset structure 6 of the rocker arm assembly, the first crank 14 drives the sliding block 18 to slide from the closing position to the opening position along the sliding rail 1-0 through the first connecting rod 16, in the process, the eighth center 8S is always kept on the same side of the axis of the energy storage spring 4, meanwhile, the sliding block 18 drives the second crank 22 to rotate towards the second direction through the second connecting rod 19, the second crank 22 drives the third crank 25 to rotate towards the second direction, the third crank 25 drives the moving contact mechanism to rotate towards the opening direction to break the corresponding static contact 42 under the action of the energy storage spring 4, and the operating mechanism is switched to the releasing state as shown in fig. 5a, namely the opening state is released. Specifically, when the operating mechanism is switched from the closing state to the releasing state, the slider 18 moves upward along the sliding rail 1-0 from the closing position to the opening and releasing position.

As shown in fig. 5a-6, the specific process of the operating mechanism from the tripped state to the tripped state (i.e. from the tripped state to the brake-off state) is as follows:

As shown in fig. 5a-5c, when the operating mechanism is in the tripped state, as shown in fig. 6, the rocker arm 3 is driven by an external force to swing towards the second end of the stroke, the external force (such as the acting force applied to the redistributing member 9 by the transmission trip 32 described below) applied to the redistributing member 9 is released, the redistributing member 10 and the redistributing member 9 are driven by the torsion spring 11 to restore to the limiting engagement, meanwhile, the rocker arm 3 drives the trip member 7 to rotate towards the first direction to restore the snap engagement with the latching member 10 through the reset structure 6, the trip member 7 drives the sliding block 18 to rotate towards the closing position from the opening position through the first crank 14 and the first connecting rod 16 but does not reach the closing position on the sliding rail 1-0, then moves back to the opening position rapidly, meanwhile, the sliding block 18 drives the second crank 22 to rotate towards the second direction through the third connecting rod 23, the third crank 25 drives the moving contact mechanism to rotate towards the second direction through the third connecting rod 23, the opening position of the moving contact mechanism rotates towards the closing direction firstly but does not rotate towards the static contact 42, and then the opening contact 42 is closed towards the opening position, and the outer force is removed, and the rocker arm is driven to switch to the tripped state. Specifically, when the operating mechanism is rebuckled from the tripped state, the rocker arm 3 is driven by external force to rotate clockwise, the reset structure 6 of the rocker arm assembly drives the trip member 7 to rotate clockwise around the first center 1S, and the trip member 7 drives the sliding block 18 to slightly move downwards along the sliding rail 1-0 but not move to the closing position through the first crank 14 and the first connecting rod 16; then, the rocker arm 3 drives the energy storage spring 4 to rotate clockwise around the second end of the energy storage spring to enable the axis of the energy storage spring 4 to rotate through the eighth center 8S, the energy storage spring 4 drives the first crank 14 to rotate anticlockwise around the eighth center 8S, and the first crank 14 drives the sliding block 18 to slide upwards to a brake separating position along the sliding rail 1-0 through the first connecting rod 15; meanwhile, the sliding block 18 drives the second crank 22 through the second connecting rod 19, the second crank 22 drives the third crank 25 through the third connecting rod 23 to rotate clockwise by a small angle and then rotate anticlockwise to return, the third crank 25 drives the moving contact mechanism to rotate from the opening position to the closing direction by a small angle, the moving contact mechanism cannot be closed with the fixed contact 42, and then the moving contact mechanism rotates to the opening position under the drive of the third crank 25.

In theory, after the operating mechanism is tripped or opened from the closing state, the eleventh shaft 2223 is limited by the second crank guiding hole 1-1, the twelfth shaft 2325 is limited by the third crank guiding hole 1-2, and the sliding block 18 is limited by the guide rail 1-0, which occur simultaneously, but the above three processes are difficult to be performed simultaneously due to actual processing errors; in this embodiment, the eleventh shaft 2223 is guaranteed to be limited before the other two shafts, which is beneficial to increasing the torque of the contact spring 4 against the friction force of the rotating shaft (i.e. the contact support of the moving contact mechanism) during closing.

As shown in fig. 4b, the bracket 1 includes two bracket side plates disposed at opposite intervals, each bracket side plate includes a side plate first portion and a side plate second portion connected to each other, the rocker arm assembly, the jump fastener 7, the lock fastener 10, the re-fastener 9 and the second crank 22 are respectively rotatably disposed on the side plate first portion, two ends of the side plate first portion in the vertical direction are respectively provided with a V-shaped groove and a slide rail 1-0, the side plate second portion is connected with one end of the side plate first portion in the horizontal direction, the rocker arm assembly is arranged in the V-shaped groove in a swinging manner, and the third crank 25 is rotatably disposed on the side plate second portion. Further, as shown in fig. 4b, the up-down direction of fig. 4b is the vertical direction of the first portion of the side plate, and the left-right direction of fig. 4b is the horizontal direction of the first portion of the side plate.

As shown in fig. 4b-5c, the bracket 1 preferably includes a bracket connecting plate, and two ends of the bracket connecting plate are respectively connected with two bracket side plates in a bending manner, so that the bracket 1 is integrally in a U-shaped structure.

Referring to fig. 1 and 4a-6, in the operating mechanism, two guide rails 1-0 are respectively disposed on two side plates of the support, two ends of a sliding block 18 are respectively slidably disposed in the two guide rails 1-0, the two sliding blocks 18 are preferably connected through a sliding block shaft 8, two second cranks 22, two second connecting rods 19, two third connecting rods 23 and two third cranks 25 are symmetrically disposed on two sides of the two side plates of the support, the rocker arm 3 comprises two rocker arm supporting legs which are disposed oppositely, and the two rocker arm supporting legs are respectively disposed in two V-shaped grooves. The first connecting rod 16 and the second connecting rod 19 are symmetrically arranged and connected in parallel, so that position errors generated in the transmission process of the left connecting rod and the right connecting rod are effectively reduced, the number of parts is reduced, the reliability of movement of the multiple connecting rods and the consistency of actions of the left electrode and the right electrode are ensured, and the method has important influence on the overall performance of the lifting circuit breaker.

As shown in fig. 4a, 5a-5b and 6, the operating mechanism is connected with each breaking unit through three parallel connecting shafts, wherein the three connecting shafts are a first connecting shaft 1a, a second connecting shaft 1b and a third connecting shaft 1c respectively. Further, the operating mechanism is arranged on one breaking unit in a crossing way, two bracket side plates of the bracket 1 are positioned on two sides of the breaking unit, one end of the operating mechanism in the vertical direction is connected with a shell of the breaking unit through three connecting shafts, and the three connecting shafts are distributed at intervals along the horizontal direction of the operating mechanism.

As shown in fig. 1-3 and 7-11, the circuit breaker of the present invention further comprises a fast tripping device, wherein the fast tripping device is used for realizing fast tripping and breaking of the circuit breaker when a short circuit fault occurs in a circuit where the circuit breaker is located, so as to realize short circuit protection, in particular: when a circuit in which the circuit breaker is located has a short circuit fault, a moving contact 41 of the breaking unit is repelled by electric repulsive force and rotates relative to a contact support 40, the moving contact 41 drives a refastening piece 9 of an operating mechanism to rotate through a transmission path, the refastening piece 9 is released from limiting fit with a locking piece 10, and the locking piece 10 rotates to release the snap fit with the locking piece 7, so that the operating mechanism is enabled to break the brake. Further, a driving gap is arranged in a transmission path from the moving contact 41 to the operating mechanism, and the operating mechanism is started to trip after the moving contact 41 rotates by a preset angle by the driving gap, so that the operating mechanism is triggered to trip and break the gate when the hard contact between the moving contact 41 and the fixed contact 42 causes the moving contact 41 to bounce during normal switching-on of the circuit breaker.

As shown in fig. 1 to 3, the quick trip apparatus includes an operating mechanism and a contact system (i.e., a contact system of a breaking unit), the moving contact mechanism of the contact system includes a contact support 40 rotatably disposed about a seventh center 7S, a moving contact 41 disposed on the contact support 40 and rotatably disposed with respect thereto, a contact spring 47 having both ends respectively connected to the contact support 40 and the moving contact 41, a first transmission structure 43 disposed on the contact support 40 and in transmission engagement with the moving contact 41, and a snap-fit first traction lever 34 and a transmission trip 32; when short-circuit current flows through the contact system, that is, when a circuit where the circuit breaker is located has a short-circuit fault, the moving contact 41 rotates relative to the contact support 40 by electric repulsive force between the moving contact 41 and the fixed contact 42, the moving contact 41 drives the first traction rod 34 to act through the first transmission structure 43 to release the snap fit with the transmission trip 32, and the transmission trip 32 acts to drive the operating mechanism to trip, so that the operating mechanism is switched to a trip-off state. Further, after the snap-fit of the transmission jump buckle 32 and the first traction rod 34 is released, the re-buckle 9 of the operating mechanism is driven to rotate so as to release the limit fit with the locking piece 10.

As shown in fig. 2-3, the movable contact 41 is rotatably disposed on the contact support 40 about the seventh center 7S; when the movable contact 41 and the fixed contact 42 are normally closed or opened, the contact spring 47 is positioned at a first position, and the first center 7S is positioned at one side of the axis of the contact spring 47; when the moving contact 41 rotates to the repulsive position relative to the contact support 40 due to the repulsive force of the moving contact 41 and the fixed contact 42, the moving contact 41 drives the contact spring 47 to swing to the second position, the first center 7S is located at the other side of the contact spring 47, and the contact spring 47 applies a force to the moving contact 41 to keep the moving contact 41 in the repulsive position, so that the moving contact 41 is prevented from being closed with the fixed contact 42 again. Further, the moving contact 41 has the same open position as the open position.

When the contact spring 47 is repelled, the contact spring 47 swings from the first position, through the dead point position, to the second position, and when the contact spring 47 is located at the dead point position, the axis of the contact spring 47 coincides with the seventh center 7S, that is, the seventh center 7S is located on the axis of the contact spring 47.

As shown in fig. 1-3, the moving contact mechanism, the transmission trip 32 and the first traction rod 34 are located at one side of the operating mechanism in the horizontal direction, a rocker arm assembly of the operating mechanism is arranged at one end of the operating mechanism in the vertical direction, and rotation axes of the rocker arm assembly, the moving contact mechanism, the transmission trip 32 and the first traction rod 34 are parallel to each other.

Referring to fig. 5b and 6, when the operating mechanism is rebuckled in the state of releasing the brake (the operating mechanism is switched to the state of releasing the brake after rebuckling in the state of releasing the brake), the rocker arm assembly drives the transmission trip 32 to reset to restore to the snap fit with the first traction rod 34, the latch element 10 and the rebuckling element 9 are respectively reset under the action of the matched torsion spring 11 to restore to the limit fit, the trip element 7 is also driven by the reset structure 6 of the rocker arm assembly to rotate to be in the rebuckled with the latch element 10, so that the rebuckling of the operating mechanism is realized, and the operating mechanism enters the brake-releasing state after rebuckling. Further, the rocker arm assembly 3 includes a rocker arm driving portion 2a, the transmission trip 32 includes a transmission trip driven portion 32-3, and the rocker arm driving portion 2a is in transmission fit with the transmission trip driven portion 32-3 to drive the transmission trip 32 to reset. Further, as shown in fig. 11, the driving latch passive part 32-3 is a boss protruding from one side of the driving latch 32, and as shown in fig. 5b and 6, the rocker arm driving part 2a is a push plate in driving engagement with the boss.

As shown in fig. 1-3, the quick tripping device further comprises a tripping device shell and a second transmission structure, the tripping device shell is realized by the shell of the breaking unit, the operating mechanism, the first traction rod 34 and the transmission trip 32 are all arranged outside the tripping device shell, the contact system and the first transmission structure 43 are all arranged inside the tripping device shell (the shell of the breaking unit), one end of the second transmission structure is positioned inside the tripping device shell (the shell of the breaking unit) and is in transmission fit with the first transmission structure 43, and the other end of the second transmission structure is positioned outside the tripping device shell (the shell of the breaking unit) and is in transmission fit with the first traction rod 34; the structure design realizes the isolation of the operating mechanism and the conductive structure (contact system) of the circuit breaker, is beneficial to improving the safety and ensures the electricity safety of operators.

As shown in fig. 1-3 and 8-9, the second transmission structure comprises a primary push rod 44 and a secondary push rod 45 which are coaxially and synchronously rotatably arranged, the primary push rod 44 comprises a primary push rod arm 44-0 and a primary push rod arm 44-1, the secondary push rod 45 comprises a secondary push rod arm 45-0 and a secondary push rod shaft 45-1 arranged on the secondary push rod arm 45-0, the primary push rod arm 44-0 is positioned in a trip device shell (a shell of a breaking unit), and the secondary push rod 45 is positioned outside the trip device shell (the shell of the breaking unit); the push rod 44-0 is in transmission fit with the first transmission structure 43 and fixedly connected with one end of the primary push rod 44-1, the primary push rod shaft 44-1 is rotatably inserted on a tripping device shell (a shell of a breaking unit), the other end of the primary push rod shaft 44-1 penetrates through the tripping device shell (the shell of the breaking unit) and then is connected with the secondary push rod arm 45-0, and the secondary push rod arm 45-0 is in transmission fit with the first traction rod 34 through the secondary push rod shaft 45-1. Further, one end of the first push rod arm 44-0 is in transmission fit with the first transmission structure 43, the other end of the first push rod arm is connected with the first push rod arm 44-1, one end of the second push rod arm 45-0 is connected with the first push rod arm 44-1, and the other end of the second push rod arm is provided with the second push rod arm 45-1. Further, the secondary push rod arm 45-0 is provided with a secondary push rod arm connecting hole 45-00, the secondary push rod arm connecting hole 45-00 is a polygonal hole, one end of the primary push rod shaft 44-1 is provided with a primary push rod shaft connecting portion 44-10, the primary push rod shaft connecting portion 44-10 is a polygonal column, and the polygonal hole and the polygonal column are matched in shape and are in plug-in fit.

The drive gap is preferably provided between the first transmission structure 43 and the primary pusher arm 44-0.

The drive gap is preferably provided between the secondary push rod shaft 45-1 and the first traction rod 34.

As shown in fig. 1-3, the first transmission structure 43 is rotatably disposed on the contact support 40.

As shown in fig. 2-3, the first transmission structure 43 and the moving contact 41 may be in transmission engagement by the prior art, for example: as shown in fig. 1-3, the first transmission structure 43 is in driving engagement with the contact spring 47, and the first transmission structure 43 rotates with the rotation of the contact spring 47. Further, the first transmission structure 43 is coaxially and synchronously rotatably arranged with the contact spring 47. Further, as shown in fig. 7, the first transmission structure 43 includes a first transmission structure mounting portion 43-0 and a first transmission structure driven portion 43-1, the first transmission structure mounting portion 43-0 is preferably provided with a first transmission structure shaft hole 43-00, and the first transmission structure 43 is rotatably sleeved on the first mounting shaft 48-0 through the first transmission structure shaft hole 43-00; the contact spring 47 comprises a contact spring main body 47-1, a contact spring first end 47-0 and a contact spring second end 47-2 which are respectively connected with two ends of the contact spring main body 47-1, wherein the contact spring first end 47-0 comprises a first end hanging part and a first end connecting part, and two ends of the first end connecting part are respectively connected with the first end hanging part and the contact spring main body 47-1; the first transmission structure mounting part 43-0 is rotatably arranged on the contact support 40 through a first mounting shaft 48-0, the first end hanging part is rotatably hung on the first mounting shaft 48-0, the first transmission structure driven part 43-1 is arranged on the first end connecting part, and the contact spring second end 47-2 is connected with the movable contact 41 through a second mounting shaft 48-1. Further, the first driven part 43-1 is provided with a first driving structure connecting hole, and the first driven part 43-1 is sleeved on the first end connecting part through the first driving structure connecting hole.

Or when the movable contact 41 is repelled, the first transmission structure 43 is rotated and pressed to rotate. Further, the moving contact 41 is provided with a moving contact boss, the first transmission structure 43 is provided with a first transmission structure driven arm, and the moving contact boss is in transmission fit with the first transmission structure driven arm. Further, the driving gap is preferably provided between the first transmission structure 43 and the moving contact 41.

As another embodiment, the first transmission structure 43 is slidably disposed on the contact support 40, and when the movable contact 41 is separated, the first transmission structure 43 is driven to slide relative to the contact support 40 and trigger the first traction rod 34 to release the snap fit with the transmission trip 32.

As shown in fig. 7, the first transmission structure 43 further includes a first transmission structure driving arm 43-2 connected to the first transmission structure mounting portion 43-0, and the first transmission structure driving arm 43-2 is in transmission engagement with the primary pusher arm 44-0 of the primary pusher 44.

As shown in fig. 1 to 3 and 5b, the first drawbar 34 is rotatably disposed about the fifth center 5S, and the first drawbar 34 is preferably rotatably disposed on the trip unit housing (housing of the breaking unit) by means of a first drawbar shaft 58.

As shown in fig. 1-3 and 5b, the driving latch 32 is rotatably disposed about the ninth center 9S, and the driving latch 32 is preferably rotatably disposed on the bracket 1 by a driving latch shaft 61.

As other embodiments, the driving trip 32 is rotatably provided on the trip device housing (the housing of the breaking unit) around the ninth center 9S.

As shown in fig. 1, 4a and 5b-6, when the first traction rod 34 and the transmission trip 32 are in snap fit, the first traction rod 34 and the transmission trip 32 have a tendency to rotate in opposite directions, so that the parts of the first traction rod 34 and the transmission trip 32 which are matched with each other have a tendency to approach each other (the first traction rod snap arm 34-2 and the transmission trip snap end 32-2 have a tendency to approach each other), and the snap fit of the two is more reliable.

As shown in fig. 1, 4a, 5a-6, the quick trip unit further includes a first drawbar return spring 36, the first drawbar return spring 36 applying a force to the first drawbar 34 to maintain the first drawbar 34 in a snap-fit with the drive trip 32. Further, as shown in fig. 10, the first drawbar 34 includes a first drawbar body 34-0 and a first drawbar spring arm 34-4 provided on the first drawbar body 34-0, the first drawbar 34 being rotatably disposed (preferably rotatably disposed on the trip unit housing) about a fifth center 5S by the first drawbar body 34-0; the first drawbar return spring 36 is a tension spring having one end connected to the first drawbar spring arm 34-4 and the other end fixedly secured (preferably to the trip unit housing).

As another embodiment, the first traction rod resetting elastic member 36 is a torsion spring, and the torsion spring is sleeved on the first traction rod shaft 58, one end of the torsion spring is matched with the first traction rod 34, and the other end of the torsion spring is fixedly arranged on the trip device shell.

As shown in fig. 1 and 5c, the quick trip apparatus further includes a driving trip elastic member 60, and the driving trip elastic member 60 applies a force to the driving trip 32 to trip the operating mechanism. Further, the transmission trip elastic member 60 is a torsion spring, and the torsion spring is sleeved on the transmission trip shaft 61, one end of the torsion spring is matched with the transmission trip 32, and the other end of the torsion spring is fixedly arranged (preferably fixedly arranged on the trip device shell). Further, the quick trip device further comprises a torsion spring limiting shaft 62 which is arranged side by side with the transmission trip shaft 61 at intervals, and one end of the fixed arrangement of the torsion spring is matched with the torsion spring limiting shaft 62.

As shown in fig. 1-3 and 10, the first traction rod 34 includes a first traction rod main body 34-0, a first traction rod driven arm 34-1 and a first traction rod snap arm 34-2 respectively disposed on the first traction rod main body 34-0, the first traction rod 34 is rotatably disposed through the first traction rod main body 34-0, the first traction rod driven arm 34-1 is in transmission fit with the second transmission structure, and the first traction rod snap arm 34-2 is in snap fit with the transmission snap 32. Further, the first traction rod driven arm 34-1 is in transmission fit with the second push rod shaft 45-1 of the second push rod 45, and when the second push rod 45 rotates around the first push rod shaft 44-1, the second push rod shaft 45-1 abuts against the traction rod driven arm 34-1 to enable the first traction rod 34 to rotate; the first traction rod body 34-0 has a cylindrical structure, a first traction rod shaft hole 34-00 is formed in the middle of the first traction rod body, the first traction rod body 34-0 is sleeved on the first traction rod shaft 58 through the first traction rod shaft hole 34-00, and the first traction rod shaft 58 is arranged on a trip device shell (a shell of a breaking unit).

As shown in fig. 1, 4a, 5a-6 and 11, the driving latch 32 includes a driving latch pivot end 32-0 and a driving latch end 32-2 disposed at two ends thereof, respectively, and the driving latch 32 is rotatably disposed around the ninth center 9S through the driving latch pivot end 32-0 and is snap-fitted with the first traction rod 34 through the driving latch end 32-2. Further, the transmission trip pivoting end 32-2 is provided with a transmission trip shaft hole 32-00, and the transmission trip pivoting end 32-2 is sleeved on the transmission trip shaft 61 through the transmission trip shaft hole 32-00.

As shown in fig. 1, 4a, 5a-6, 10 and 11, the first traction lever snap arm 34-2 of the first traction lever 34 is provided with a snap arm hook 34-20, the transmission trip snap end 32-2 is provided with a snap end hook 32-20, and the snap arm hook 34-20 and the snap end hook 32-20 are in snap fit to form a snap structure 3a. Further, the latch arm hook 34-20 and the latch end hook 32-20 are both half-arrow hooks, and when the latch arm hook 34-20 and the latch end hook 32-20 are in latch fit, the two have a tendency to move in opposite directions.

As shown in fig. 1, 4a, 5a-6, and 11, the transmission trip 32 is in a C-shaped structure, an opening of the C-shaped structure faces the seventh center 7S (a moving contact mechanism and a rotation center of the third crank 25), a transmission trip driving surface 32-1 in transmission fit with the refastening member 9 of the operating mechanism is arranged at the back of the C-shaped structure, after the transmission trip 32 is in contact snap fit with the first traction rod 34, the transmission trip 32 rotates, and the refastening member 9 is driven to rotate through the transmission trip driving surface 32-1 so as to release the limit fit with the fastening member 10, so that the operating mechanism is finally tripped. The transmission jump button 32 is designed into a C-shaped structure, skillfully avoids the third crank 25 used for connecting the moving contact mechanism, and fully utilizes the internal space of the circuit breaker.

As shown in fig. 1, 4a, 5a and 6, the connection lines at two ends of the transmission jumping buckle 32 are first connection lines, the first connection lines and the transmission jumping buckle 32 form a D-shaped space, the seventh center 7S is always located outside the D-shaped space, and the seventh center 7S and the transmission jumping buckle 32 are located at two sides of the first connection lines. Further, the included angle between the two ends of the transmission jump buckle 32 and the connecting line of the seventh center 7S is an obtuse angle.

As shown in fig. 1 and 5c, the circuit breaker of the present invention further includes a test button 46 slidably provided on the trip unit housing (housing of the breaking unit), an external force pressing the test button 46 to slide, the test button 46 driving the first traction lever 34 to rotate to release the snap-fit with the transmission trip 32; the test button 46 enables a passive operation to trip the operating mechanism. Further, the test button 46 is in driving engagement with the first traction rod driven arm 34-1 of the first traction rod 34, one end of the test button 46 is preferably in opposite engagement with the free end of the first traction rod driven arm 34-1, and when the test button 46 is pressed to slide, the test button 46 presses the first traction rod driven arm 34-1 to rotate the first traction rod 34, and the sliding direction of the test button 46 is preferably perpendicular to the rotation axis of the first traction rod 34. Further, a first design distance is provided between the test button 46 and the first traction rod driven arm 34-1, so as to avoid the error touching the test button 46 to trigger the operating mechanism to trip.

The circuit breaker of the present invention further includes a test button resilient return member 24, the test button resilient return member 24 exerting a force on the test button 46 to cause it to slide in a direction to clear the first drawbar receiver arm 34-1. The elastic reset piece 24 of the test button is preferably a linear spring, and is sleeved on the test button 46, one end of the elastic reset piece is matched with the test button 46, and the other end of the elastic reset piece is matched with a trip device shell (a shell of the breaking unit).

As shown in fig. 5c, the circuit breaker of the present invention further comprises a thermo-magnetic tripping mechanism, and when a short circuit or overload fault occurs in a circuit where the circuit breaker is located, the thermo-magnetic tripping mechanism drives the operating mechanism to trip so as to realize a short circuit or overload protection function. Furthermore, in the circuit breaker, each breaking unit is matched with a group of thermomagnetic tripping mechanisms; or when the circuit breaker is of the nP+N type, N is more than or equal to 1, each P pole breaking unit is matched with one group of thermomagnetic tripping mechanisms, and the N pole breaking units are not provided with the corresponding thermomagnetic tripping mechanisms. Further, the thermomagnetic tripping mechanism is arranged in the shell of the corresponding breaking unit.

In this embodiment, as shown in fig. 5c, the thermo-magnetic trip mechanism includes a second traction rod 49 rotatably disposed, the second traction rod 49 is in driving connection with the first traction rod 34, when a circuit in which the circuit breaker is located has a short circuit or overload fault, the thermo-magnetic trip mechanism drives the first traction rod 34 to act through the second traction rod 49 to release the snap fit with the transmission trip 32, and the transmission trip 32 acts to drive the operating mechanism to trip; that is, when a short circuit or overload fault occurs in the circuit where the circuit breaker is located, the thermo-magnetic tripping mechanism drives the second traction rod 49 to rotate, and the second traction rod 49 simultaneously drives the first traction rod 34 to rotate so as to release the snap fit with the transmission trip 32.

As shown in fig. 5c, the operating mechanism, the transmission trip 32, the first traction rod 34 and the thermo-magnetic trip mechanism are sequentially arranged along the horizontal direction of the operating mechanism.

As shown in fig. 5c, the axes of rotation of the second drawbar 49, the drive jump 32 and the first drawbar 34 are parallel to each other.

As shown in fig. 5c and 10, the first drawbar 34 further includes a first drawbar coupling arm 34-3 disposed on the first drawbar body 34-0, the second drawbar 49 includes a second drawbar body 49 and a second drawbar coupling arm 49-1 disposed on the second drawbar body 49, and the second drawbar coupling arm 49-1 is drivingly coupled to the first drawbar 34-3 through a coupling rod 55. Further, both ends of the connecting rod 55 are hinged to the second traction rod connecting arm 49-1 and the first traction rod connecting arm 34-3 through a first hinge shaft 55-0 and a second hinge shaft 55-1, respectively.

As shown in fig. 10, one embodiment of the first drawbar 34 is shown: the first traction rod 34 includes a first traction rod main body 34-0, and a first traction rod driven arm 34-1, a first traction rod snap arm 34-2, and a first traction rod connecting arm 34-3 respectively disposed on the first traction rod main body 34-0, wherein the first traction rod 34-0 is a cylindrical structure, and the first traction rod driven arm 34-1, the first traction rod snap arm 34-2, and the first traction rod connecting arm 34-3 are sequentially distributed along the circumferential direction of the first traction rod main body 34-0. Further, the included angle between the first traction lever hasp arm 34-2 and the first traction lever driven arm 34-1 is an obtuse angle.

Preferably, as shown in fig. 10, the first traction lever 34 further includes a first traction lever spring arm 34-4, and the first traction lever driven arm 34-1, the first traction lever spring arm 34-4, the first traction lever snap arm 34-2, and the first traction lever connecting arm 34-3 are sequentially distributed along the circumferential direction of the first traction lever body 34-0.

In the circuit breaker of the invention, the first traction rod 34 can be in transmission fit with the movable contact 41, the test button 46 and the second traction rod 49 at the same time, and the operating mechanism is opened and tripped in three different modes.

As shown in fig. 5c, an embodiment of the thermo-magnetic trip mechanism is shown: the thermo-magnetic tripping mechanism comprises a thermo-magnetic tripping yoke 54, a thermo-magnetic tripping armature 53, a bimetal element 51 and an armature transmission piece 50, wherein the thermo-magnetic tripping armature 53 is respectively and rotatably arranged on the thermo-magnetic tripping yoke 54 through an armature shaft 52-1 and the armature transmission piece 50 through a transmission piece shaft 52-2, the thermo-magnetic tripping armature 53 is in transmission fit with the second traction rod 49 through the armature transmission piece 50 so as to drive the second traction rod 49 to rotate when a circuit where the circuit breaker is located has a short circuit fault, and the bimetal element 51 is also in transmission fit with the second traction rod 49 so as to drive the second traction rod 49 to rotate when the circuit where the circuit breaker is located has an overload fault. The thermomagnetic tripping yoke 54, the thermomagnetic tripping armature 53, the bimetallic element 51 and the armature transmission element 50 can all be realized by means of the prior art, and are not described in detail here.

As shown in fig. 12, the second traction rod 49 further includes a second traction rod armature engaging arm 49-2 and a second traction rod double-metal engaging arm 49-3 respectively provided on the second traction rod body 49-0, which are respectively in driving engagement with the armature driving member 50 and the bimetal element 51; the second drawbar body 49-0 is rotatably provided on the housing of the breaking unit by a second drawbar shaft 56. Further, a second design distance is provided between the armature transmission member 50 and the second traction rod armature engagement arm 49-2, so that the tripping of the operating mechanism is prevented from being triggered due to the vibration of the product.

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

Claims

1. An operating mechanism of a circuit breaker comprises a bracket (1), a rocker arm assembly, a jump buckle (7), a lock buckle (10) and a re-buckle (9) which are respectively arranged on the bracket (1) in a rotating mode, a first crank (14), an energy storage spring (4), a sliding rail (1-0) fixedly arranged relative to the bracket (1), a sliding block (18), a first connecting rod (16), a second connecting rod (19) and a second crank (22) rotatably arranged around a sixth center (6S); the locking piece (10) is in snap fit with the jump piece (7) and is in limit fit with the re-locking piece (9); one end of the first crank (14) is rotatably arranged on the jump fastener (7) around the eighth center (8S), the other end of the first crank is rotatably connected with one end of the first connecting rod (16) and one end of the energy storage spring (4) around the tenth center (10S), the other end of the energy storage spring (4) is connected with the rocker arm assembly, the other end of the first connecting rod (16) is rotatably connected with the sliding block (18), the sliding block (18) is slidably arranged on the sliding rail (1-0), one end of the second connecting rod (19) is rotatably connected with the sliding block (18), and the other end of the second connecting rod is rotatably connected with the second crank (22) around the eleventh center (11S) to drive the second crank to rotate; the sliding rail (1-0) is in limit fit with the sliding block (18) to prevent the sliding block (18) from sliding under the brake-separating or tripping state of the operating mechanism; the method is characterized in that: the operating mechanism further comprises a third connecting rod (23) and a third crank (25) which is rotatably arranged around a seventh center (7S), one end of the second crank (22) is rotatably connected with one end of the third connecting rod (23) around an eleventh center (11S), and the other end of the third connecting rod (23) is rotatably connected with the third crank (25) around a twelfth center (12S) to drive the third crank to rotate; the rocker arm assembly and the second crank (22) are respectively positioned at two ends of the operating mechanism in the vertical direction of the operating mechanism, and the third crank (25) is positioned at one side of the operating mechanism in the horizontal direction of the operating mechanism.

2. The operating mechanism of a circuit breaker according to claim 1, wherein: the sixth center (6S), the seventh center (7S), the eleventh center (11S) and the twelfth center (12S) are arranged at intervals in parallel and positioned at four vertexes of one quadrangle; the second crank (22) is rotatably arranged on the bracket (1) around a sixth center (6S), and the third crank (25) is rotatably arranged on the bracket (1) around a seventh center (7S).

3. The operating mechanism of a circuit breaker according to claim 1, wherein:

The bracket (1) is provided with a second crank guide hole (1-1), the second crank (22) is rotationally connected with the third connecting rod (23) through an eleventh shaft (2223), the eleventh shaft (2223) is inserted into the second crank guide hole (1-1), and the shape of the second crank guide hole (1-1) is matched with the movement track of the eleventh shaft (2223);

And/or the bracket (1) is provided with a third crank guide hole (1-2), the third connecting rod (23) is rotationally connected with the third crank (25) through a twelfth shaft (2325), the twelfth shaft (2325) is inserted into the third crank guide hole (1-2), and the shape of the third crank guide hole (1-2) is matched with the movement track of the twelfth shaft (2325).

4. The operating mechanism of a circuit breaker according to claim 1, wherein: the second crank (22) is of a strip-shaped plate structure, one end of the second crank is rotatably arranged around a sixth center (6S), and the other end of the second crank is rotatably connected with the third connecting rod (23) and the second connecting rod (19) around an eleventh center (11S).

5. The operating mechanism of a circuit breaker according to claim 1, wherein: the third crank (25) is of a triangle plate structure, a first vertex angle is rotatably arranged around a seventh center (7S), a second vertex angle is rotatably connected with a third connecting rod (23) around a twelfth center (12S), and the third vertex angle is rotatably connected with a moving contact mechanism of the circuit breaker.

6. The operating mechanism of a circuit breaker of claim 5, wherein: the third crank (25) is an obtuse triangle plate structure, and the first vertex angle of the third crank is an obtuse angle.

7. The operating mechanism of a circuit breaker according to claim 2, wherein: the support (1) comprises two support side plates which are arranged at opposite intervals, each support side plate comprises a side plate first part and a side plate second part which are connected with each other, the rocker arm assembly, the jump fastener (7), the lock fastener (10), the re-fastener (9) and the second crank (22) are respectively and rotatably arranged on the side plate first part, two ends of the side plate first part in the vertical direction are respectively provided with a V-shaped groove and a sliding rail (1-0), the side plate second part is connected with one end of the side plate first part in the horizontal direction, the rocker arm assembly is arranged in the V-shaped groove in a swinging mode, and the third crank (25) is rotatably arranged on the side plate second part.

8. The operating mechanism of a circuit breaker according to claim 1, wherein: the sliding rail (1-0) is of a groove-shaped structure or a hole-shaped structure.

9. The operating mechanism of a circuit breaker according to claim 1, wherein: the sliding rail (1-0) is arranged on the bracket (1);

The operating mechanism further comprises a first traction rod (34) and a transmission trip button (32) which are in snap fit and are respectively and rotatably arranged, the transmission trip button (32) is driven to rotate when a circuit where the circuit breaker is located is in a short circuit and/or overload fault, the snap fit with the first traction rod (34) is released, and the first traction rod (34) rotates to drive the operating mechanism to trip;

The operating mechanism further comprises a thermomagnetic tripping mechanism, and when the circuit breaker has short circuit and overload faults, the thermomagnetic tripping mechanism drives the first traction rod (34) to rotate so as to release the snap fit with the transmission tripping buckle (32);

the first traction rod (34) is driven by a moving contact (41) of the circuit breaker to release the snap fit with the transmission trip button (32) when the circuit of the circuit breaker has a short circuit fault;

the operating mechanism further comprises a test button (46) which is arranged in a sliding way, the test button (46) is driven by external force to slide, and the test button (46) drives the first traction rod (34) to act so as to release the snap fit with the transmission jump button (32);

When the operating mechanism is rebuckled from the unbuckled brake-separating state, the rocker arm component of the operating mechanism drives the transmission jump buckle (32) to reset and restore to be in snap fit with the first traction rod (34).

10. A circuit breaker comprising an operating mechanism of the circuit breaker according to any one of claims 1-9 and at least one set of breaking units comprising a contact system and an arc extinguishing chamber, the contact system comprising a moving contact mechanism and a stationary contact (42) for cooperation, the moving contact mechanism comprising a contact support (40) arranged rotatably about a seventh centre (7S) and a moving contact (41) arranged on the contact support (40), the contact support (40) being in driving connection with a third crank (25), the rocker arm assembly, the second crank (22) and the arc extinguishing chamber being arranged in sequence in the vertical direction of the operating mechanism.