CN216928450U

CN216928450U - Circuit breaker contact system

Info

Publication number: CN216928450U
Application number: CN202123287974.7U
Authority: CN
Inventors: 张进; 朱华
Original assignee: Shanghai Jingsi Intelligent Technology Co ltd
Current assignee: Shanghai Jingsi Intelligent Technology Co ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-07-08
Anticipated expiration: 2031-12-24

Abstract

The utility model discloses a breaker contact system, wherein a bidirectional magnetic holding device is provided with a transmission shaft which can be manually or electrically operated to perform transverse movement, a transient protection unit is provided with a tripping shaft which can be manually or electrically operated to perform transverse movement and vertical movement, the tripping shaft is positioned between the transmission shaft and a moving contact support, and the transmission shaft is provided with an energy storage mechanism and a holding mechanism; when the switch is switched on, the energy storage mechanism releases energy, moves towards the switch-on direction through the driving transmission shaft, the tripping shaft and the moving contact supporting piece, and provides switch-on holding force by the holding mechanism when the switch is switched on; when the brake is opened, the movable contact support piece, the tripping shaft and the transmission shaft are reset towards the brake opening direction, and the holding mechanism provides brake opening holding force and stores energy for the energy storage mechanism; when overload or short circuit occurs, the tripping shaft is driven to vertically move, so that the tripping shaft is separated from the transmission shaft and the moving contact supporting piece to perform tripping and brake-separating protection. The utility model can improve the opening and closing speed and reliability.

Description

Circuit breaker contact system

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a circuit breaker product, and specifically relates to a circuit breaker contact system.

Background

The circuit breaker is a common device in electrical equipment, has a certain protection function besides a control function, and is widely applied to control and protection of various levels of inlet and outlet wires of a low-voltage power distribution system, power supply control of various mechanical equipment and power terminals. Typical circuit breakers are classified into a plug-in type, a fixed type and a drawer type according to installation manners, and among them, the plug-in type circuit breaker is most widely used. The traditional plug-in circuit breaker with the automatic opening and closing function mostly adopts a motor and gear reduction structure, and realizes electric operation through control of an electronic control board, wherein a four-bar mechanism is adopted between the opening and closing operation mechanism and a transmission contact system, and belongs to the technical scheme of the traditional mechanical circuit breaker and motor reduction mechanism; in addition, the circuit breaker sometimes can not effectively keep after the switching-on and switching-off is accomplished, still has simultaneously and can not in time the risk of dropout when transshipping or short circuit, and this leads to the product reliability not high enough.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a circuit breaker contact system which can improve the response speed and reliability of a product.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: a circuit breaker contact system is provided with a bidirectional magnetic holding device and a snap-action protection unit, wherein the bidirectional magnetic holding device is provided with a transmission shaft which can be manually or electrically operated to perform transverse movement, the snap-action protection unit is provided with a tripping shaft which can be manually or electrically operated to perform transverse movement and vertical movement, the tripping shaft is positioned between the transmission shaft and a moving contact support, and the transmission shaft is provided with an energy storage mechanism and a holding mechanism; when the switch is switched on, the energy storage mechanism releases energy, moves towards the switch-on direction through the driving transmission shaft, the tripping shaft and the moving contact supporting piece, and provides switch-on holding force by the holding mechanism when the switch is switched on; when the brake is switched off, the movable contact support, the tripping shaft and the transmission shaft are reset towards the direction of the switch-off, and the holding mechanism provides a switch-off holding force and stores energy for the energy storage mechanism; when the tripping shaft is overloaded or in short circuit, the tripping shaft is driven to vertically move, so that the tripping shaft is separated from the transmission shaft and the moving contact supporting piece to carry out tripping and brake-separating protection.

Furthermore, the bidirectional magnetic holding device comprises a magnetic yoke, magnetic steel, a movable iron core, a left static iron core and a right static iron core, wherein the magnetic steel is fixedly arranged inside the magnetic yoke; the energy storage mechanism can exert force on the movable iron core to accelerate switching-on.

Furthermore, the energy storage mechanism comprises an energy storage spring, and the energy storage spring is sleeved on the transmission shaft and is positioned between the movable iron core and the left static iron core.

Furthermore, the movable iron core is provided with an energy storage spring cavity, and an energy storage spring can be arranged in the energy storage spring cavity for positioning.

Furthermore, the transient protection unit is provided with a U-shaped magnetic yoke, an armature, a tripping sliding plate and a tripping sliding plate reset spring, wherein the armature is arranged in the U-shaped magnetic yoke, a tripping copper bar penetrates between the armature and the U-shaped magnetic yoke, the tripping sliding plate is connected with the armature, the tripping sliding plate reset spring respectively exerts force on the tripping sliding plate and the U-shaped magnetic yoke, and the tripping shaft can move along with the tripping sliding plate.

Furthermore, the tripping sliding plate is provided with a tripping sliding plate middle hole, and the tripping shaft is arranged in the tripping sliding plate middle hole.

Furthermore, a buckle groove is formed in the bottom of the tripping sliding plate, and the armature is arranged in the buckle groove to be buckled with the tripping sliding plate.

Furthermore, the tripping sliding plate is provided with a spring positioning hole, and the sliding plate reset spring can be arranged in the spring positioning hole for positioning.

Furthermore, a flexible connecting line is arranged in front of the tripping copper bar and the moving contact supporting piece, and two ends of the flexible connecting line are respectively connected with the tripping copper bar and the moving contact supporting piece.

Furthermore, the moving contact supporting piece is provided with a supporting piece ejector rod, the tripping shaft is in contact with or separated from the supporting piece ejector rod to realize manual or electric switching-on, switching-off or tripping-off, and the moving contact supporting piece is provided with a moving contact spring and a reset counter force spring to provide switching-on pressure during switching-on and switching-off restoring force during switching-off.

Compared with the prior art, the utility model provides a direct-acting circuit breaker, a contact system of which is provided with a bidirectional magnetic holding device and an instantaneous protection unit, wherein: the bidirectional magnetic holding device is directly operated to complete the switching-on and switching-off of the circuit breaker, the stability of an operating mechanism and a moving and static contact system after switching-on or switching-off is reliably maintained by the bidirectional magnetic holding device, and in addition, the bidirectional magnetic holding device is also provided with an energy storage spring to accelerate the switching-on speed; overload or short circuit tripping protection is realized through the snap-action protection unit, and the reliability of the product can be improved.

Drawings

Fig. 1 is a schematic cross-sectional view of a circuit breaker of the present invention;

FIG. 2 is a schematic diagram of a circuit breaker control circuit according to the present invention;

FIG. 3 is a waveform diagram of the breaker control signals and states of the present invention;

FIG. 4 is a schematic diagram of the force applied to the transmission shaft of the circuit breaker according to the present invention;

FIG. 5 is a schematic sectional view of the circuit breaker in an open state according to the present invention;

FIG. 6 is a schematic cross-sectional view of the closing state of the circuit breaker according to the present invention;

fig. 7 is a first schematic diagram of the circuit breaker operating mechanism of the present invention;

FIG. 8 is a second schematic diagram of the circuit breaker operating mechanism of the present invention;

fig. 9 is a schematic view of the assembly of the trip slider and the trip shaft in the circuit breaker operating mechanism of the present invention;

fig. 10 is a schematic view of a bidirectional magnetic holding device of the circuit breaker of the present invention;

fig. 11 is a first schematic sectional view of a closing state W-W of the bidirectional magnetic latching device of the circuit breaker of the present invention;

FIG. 12 is a schematic sectional view W-W of the bidirectional magnetic latching device of the circuit breaker in the open state;

fig. 13 is a partial schematic view of the structure of the circuit breaker instantaneous protection unit, the moving contact system, the static contact and the shunt detection system of the present invention;

fig. 14 is a schematic cross-sectional view of a first phase of tripping of the circuit breaker of the present invention;

fig. 15 is a schematic cross-sectional view of a second stage trip condition of the circuit breaker of the present invention;

fig. 16 is a schematic cross-sectional view of a third stage trip condition of the circuit breaker of the present invention;

fig. 17 is a schematic diagram of an initial state of snap-action protection of the circuit breaker of the present invention;

fig. 18 is a schematic diagram of a first stage state of transient protection of the circuit breaker of the present invention;

fig. 19 is a schematic diagram of a second stage state of the circuit breaker transient protection of the present invention;

fig. 20 is a third state diagram illustrating snap-in protection of the circuit breaker of the present invention;

fig. 21 is a schematic diagram of an action ending state of a circuit breaker instantaneous protection unit according to the present invention;

fig. 22 is an assembly view of the circuit breaker contact position sensing and status indication of the present invention;

fig. 23 is a schematic view of an initial state of an emergency trip mechanism of the circuit breaker of the present invention;

fig. 24 is a schematic view of a circuit breaker trip button of the present invention in a depressed state;

fig. 25 is a schematic view of the circuit breaker with the circuit breaker lock release depressed;

fig. 26 is a schematic view showing a state where the breaker operating handle is pulled out.

Detailed Description

The utility model will be described in further detail below with reference to the drawings and specific examples, but it should not be understood that the scope of the utility model is limited to the following examples.

It should be noted that the references to orientations (such as front, back, left, right, up, down, etc.) in the following embodiments are merely relative to positions in the drawings, and are for convenience of description and understanding, and are not limited to actual positions of products in physical space.

Referring to fig. 1-26, the overall circuit breaker, mechanism and component structure of the present invention is shown and described in detail as follows.

First, general scheme

Referring to fig. 1, the general structure of the circuit breaker of the present invention is shown. As shown in fig. 1, the circuit breaker of the present invention is composed of a manual operation unit 1, an electric operation unit 2, a transient protection unit 3, a moving contact system 4, a static contact system 5 (including a shunt detection system), an arc extinguishing system 6, a wire inlet end (a main loop and a control signal connection) 7, a wire outlet end (a user main loop fast connection) 8, an electronic control and human-computer interaction unit 9, a housing 10, and the like, wherein: the manual operation unit 1 includes an operation handle 101, a linkage 102, a lock release 103, an intermediate transmission 104, a trip button 105, a return spring 106, a trip button 107, a cam transmission, and other components (as shown in fig. 23 to 26), and can perform manual opening and closing and emergency tripping; the electric operation unit 2 is a bidirectional magnetic holding device, and is also provided with an instantaneous protection unit 3, a moving contact system 4, a static contact system 5, a shunt detection system and the like, so that switching-on and switching-off can be rapidly carried out; the moving contact system 4, the static contact system 5, the shunt detection system and the arc extinguishing system 6 form a contact and an arc extinguishing unit; the incoming line end 7 is used for main circuit and control signal wiring, and the outgoing line end 8 is used for user main circuit fast wiring; the electronic control and human-computer interaction unit 9 detects the current breaker state (through a mechanism motion monitoring 901 mechanism and a contact position monitoring 902 detection mechanism) and receives a control signal (remote control is active control, and overload protection is passive control), and when the electronic control unit 9 receives a closing instruction, the closing motion of the bidirectional magnetic holding device is triggered; when the electronic control unit 9 receives an opening or tripping opening command, it triggers the bidirectional magnetic latching device to open, wherein the state of the circuit breaker is indicated by a circuit breaker state indication mechanism 903 (such as an LED lamp).

The various subsystems, mechanisms and important parts are described further below.

Second, control system

Referring to fig. 2-4, the electronic control circuit structure, control mode and process of the circuit breaker of the utility model are shown. The circuit breaker comprises a bidirectional magnetic holding device and an instantaneous protection unit 3, wherein the bidirectional magnetic holding device is used for driving a moving contact and a static contact of the circuit breaker to be switched on or switched off and providing corresponding magnetic holding force when the circuit breaker is switched on or switched off, the instantaneous protection unit 3 is used for tripping the moving contact and the static contact to be switched off when the circuit breaker fails, a circuit breaker control system can automatically detect the state of the circuit breaker and receive an external control signal so as to trigger the bidirectional magnetic holding device to act to switch on or switch off according to the state of the circuit breaker or the external control signal, or trigger the instantaneous protection unit 3 to act to rapidly trip the moving contact 403 and the static contact 501 to be protected when the circuit breaker is overloaded or has a short-circuit fault.

In addition, the circuit breaker control system is provided with an electronic control and human-computer interaction unit 9 which is provided with a circuit breaker mechanism action monitoring mechanism 901, a contact position monitoring mechanism 902 and a circuit breaker state indicating mechanism 903, so as to monitor the operation process and state of the circuit breaker more effectively.

As shown in fig. 2, the circuit breaker control system is preferably provided with an MCU, which is connected to the drive circuits DRV-Wa and DRV-Wb of the bidirectional magnetic keeper and the drive circuit of the wink protection unit 3, for outputting an MCU control signal to the coils Wa, Wb of the bidirectional magnetic keeper and the control part of the wink protection unit 3 to drive the bidirectional magnetic keeper and the wink protection unit 3 to operate. In addition, the circuit breaker control system is provided with a hardware protection circuit (halewarprotection), the hardware protection circuit is connected with the MCU, and the hardware protection circuit and the MCU are respectively connected with a plurality of sensors (such as a temperature sensitive sensor Rt) to acquire circuit breaker operation state detection signals, such as voltage acquisition signals Ve and Vin, current acquisition signals I _ s, temperature acquisition signals Tam, T1, T2 and the like, so that the MCU controls the bidirectional magnetic holding device and the transient protection unit to act. After the MCU is arranged, the circuit breaker is quick in response and high in precision, and the control performance is effectively improved.

As shown in fig. 3, the circuit breaker driving signal in the present invention is PWM (pulse width modulation), and the corresponding output square wave current signal (current) is approximately square wave in the switch states (open and close). As shown in fig. 4, in the operation process, because of the energy storage spring, the forward force of the transmission shaft 203 is greater than the reverse force during closing, which is beneficial to rapid closing.

In the utility model, the MCU controls the action of an electronic solid-state switch device (the Input voltage is Input, the Output voltage is 48V) of the circuit breaker in a state machine mode, wherein the state of the circuit breaker comprises a self-checking state, a sleeping state, a standby state, a full closing state and a protection state, the MCU controls the circuit breaker to switch among the states, and the state of the circuit breaker can be displayed by an LED.

In the utility model, the MCU is provided with an auxiliary power supply (auxpower) to ensure reliable power supply, and is connected with various communication interfaces (such as RS485 and the like) to receive or output corresponding signals (such as an enable signal RS485/EN, a driving signal RS485/DRV and the like) so as to regularly monitor the control signal and the detection signal of the circuit breaker, refresh the running state of the circuit breaker and locally store or upload corresponding data. The circuit breaker control system Is connected with a current-limiting inductor Lsc in series before a breaking point Ke of a mechanical switch of the circuit breaker and a sampling resistor Is between electronic solid-state switching devices so as to protect the electronic solid-state switching devices.

Three, two-way magnetic latching actuator

Referring to fig. 5-9, the circuit breaker of the present invention relates to the states of closing, opening, tripping and opening, and the like, and the corresponding operating mechanism is composed of a manual operating unit 1, an electric operating unit 2, a transient protection unit 3, a movable contact system 4, a static contact system 5, a shunt detection system, and the like, wherein a transmission shaft 203, a trip shaft 302, and a movable contact support 401 in the operating mechanism are important executing components, which will be described below.

As shown in fig. 7-9, the circuit breaker of the present invention is provided with a transmission shaft 203 which can be manually or electrically operated to perform a lateral movement and a trip shaft 302 which can be manually or electrically operated to perform a lateral movement and a vertical movement, the trip shaft 302 is located between the transmission shaft 203 and a movable contact support 401, the transmission shaft 203 is provided with an energy storage mechanism and a holding mechanism; when the switch is switched on, the energy storage mechanism releases energy, the movable contact and the static contact are combined to be switched on by driving the transmission shaft 203, the trip shaft 302 and the movable contact supporting piece 401 to move towards the switching-on direction, and a switching-on holding force is provided by the holding mechanism when the switch is switched on; during opening, the movable contact support 401, the trip shaft 302 and the transmission shaft 203 are reset towards the opening direction, and the holding mechanism provides opening holding force during opening and stores energy for the energy storage mechanism; in case of overload or short circuit, the tripping shaft 302 is driven to move vertically, so that the tripping shaft 302 is separated from the transmission shaft 203 and the movable contact support 401 to perform tripping and opening protection (as shown in fig. 4-6). The moving contact support 401 is provided with a moving contact spring and a return reaction spring to provide a closing pressure when closing and an opening restoring force when opening.

In the utility model, in order to ensure the stability and reliability of the closing and opening of the breaker, a corresponding retaining mechanism is arranged. Preferably, the holding mechanism is a bidirectional holding actuating mechanism, in particular to a bidirectional magnetic holding device, which can quickly and reliably perform opening and closing and provide magnetic holding force to ensure the stable state of the circuit breaker when the opening and closing are completed.

Referring to fig. 10-12, the bidirectional magnetic holding device includes

magnetic yokes

201 and 202, a transmission shaft 203, a magnetic steel 204, a movable iron core 206, a left side static iron core and a right side static iron core 205, the magnetic steel 204 is fixedly installed inside the

magnetic yokes

201 and 202, the movable iron core 206 is installed in the transmission shaft 203 and is accommodated in a cavity enclosed by the

magnetic yokes

201 and 202, the transmission shaft 203 is movably installed in the

magnetic yokes

201 and 202, the left side static iron core and the right side static iron core 205 are respectively fixed on two sides of the

magnetic yokes

201 and 202, wherein the magnetic yokes, the magnetic steel and the left side static iron core form a switching-off magnetic circuit C1, the magnetic yokes, the magnetic steel and the right side static iron core form a switching-on magnetic circuit C2, the switching-off magnetic circuit C1 provides a switching-off magnetic holding force for the transmission shaft 203 when switching-off is completed, and the switching-on magnetic circuit C2 provides a switching-on magnetic holding force for the transmission shaft 203 when switching-on is completed.

As shown in fig. 10-12, a corresponding energy storage mechanism is provided in the bidirectional magnetic holding device, which specifically includes an energy storage spring 207, the energy storage spring 207 is sleeved on the transmission shaft 203 and located between the movable iron core 206 and the left stationary iron core 205, and stores energy during opening, and releases energy to accelerate the closing speed during closing. Here, the plunger 206 is provided with an energy storage spring cavity, and the energy storage spring 207 can be installed in the energy storage spring cavity for positioning, so as to maintain the stability of the energy storage spring 207.

Contact system

The moving contact and the static contact of the circuit breaker can be switched on and off through the bidirectional magnetic retaining device, and can also be tripped and switched off through the instantaneous protection unit in overload or short-circuit faults, as described in detail below.

Referring to fig. 13, the present invention is a circuit breaker with bidirectional magnetic latching function, wherein an operating mechanism thereof is configured with a bidirectional magnetic latching device, an instantaneous protection unit 3, a moving contact system 4, a static contact system 5, a shunt detection system, etc., and can rapidly perform opening, closing, and tripping, wherein the circuit breaker can be operated manually or electrically, as described in detail below.

Referring to fig. 14-16, the switching-off state of the bidirectional magnetic keeper of the circuit breaker, the switching-off state and the switching-off completion state are shown. Referring to fig. 17-21, the circuit breaker opening and closing and tripping protection process is shown, as described below.

For convenience, the following description will define the rightward direction as the closing direction and the leftward direction as the opening direction.

(I) Manual operation

As shown in fig. 14-21 and referring to fig. 23-26, the operating handle 101 is manually pushed, so as to push the link 102 to move forward together, the link 102 drives the transmission shaft 203 of the bidirectional magnetic holding device to move forward together, so as to push the trip shaft 302 and the movable contact system 4 to move forward, so as to close and hold the contacts of the movable contact system 4 and the static contact system 5, that is, to turn on the circuit breaker; the operating handle 101 is manually pulled, and then the linkage 102 is pulled to move backwards together, the linkage 102 drives the transmission shaft 203 of the bidirectional magnetic holding device to move backwards together, the movable contact system 4 moves backwards under the action of the contact spring 402 and the reaction spring 405, and separation and holding of the movable contact system 4 and the static contact system 5 are realized, that is, the circuit breaker is disconnected.

When the switch is closed, magnetic holding force is provided by the magnetic steel 204 of the bidirectional magnetic holding device and a switch-on magnetic circuit (right side) formed by the

magnetic yokes

201 and 202 and the static iron core 205 (right side), and contact pressure is provided by a contact spring 402 in the moving contact system 4, so that reliable switch-on is ensured; when the bidirectional magnetic holding device is disconnected, the closing magnetic circuit of the bidirectional magnetic holding device moves backwards due to manual pulling, an air gap L2 is generated, further, the contact spring 402 and the counter spring 405 provide counter force, so that the moving contact and the static contact are quickly separated, meanwhile, the tripping shaft 302 moves backwards under the action of the ejector rod 401a of the moving contact support 401, magnetic steel 204 of the bidirectional magnetic holding device and a separating magnetic circuit (left side) formed by the

magnetic yokes

201 and 202 and the static iron core 205 (left side) provide magnetic holding force, reliable disconnection is ensured, and at the moment, the gap between the moving contact and the static contact is L1.

(II) electric operation

The electric operation includes an overload or short-circuit protection action in addition to the opening and closing. The method specifically comprises the following steps: the electronic control and man-machine interaction unit 9 gets power from the incoming line end 7, detects the current breaker state (detected by a mechanism motion monitor 901 and a contact position monitor 902) and receives control signals (remote control is active control, and overload protection is passive control), when the electronic control unit 9 receives a closing instruction, the electronic control unit triggers the bidirectional magnetic holding device to perform closing motion, namely the movable iron core 206 and the transmission shaft 203 move forwards to realize closing; when the electronic control unit 9 receives a brake-separating or tripping command, the bidirectional magnetic holding device is triggered to perform a brake-separating action, that is, the movable iron core 206 and the transmission shaft 203 move backwards to realize brake separation. When the brake is switched on and off, the logic relation is the same as that of manual operation, and the description is omitted.

It should be noted that, when the circuit breaker and the distribution line are in a non-fault state by default in the manual operation and the electric operation, the instantaneous tripping unit 3 ensures that the tripping shaft 302 transmits between the transmission shaft 203 of the bidirectional magnetic holding device and the top rod 401a of the movable contact support 401 under the action of the spring 304. If the snap-action protection unit 3 acts, the overload or short-circuit protection action is the same as the logic of the electrically operated opening.

(III) instantaneous protection tripping operation

The utility model provides a snap-action protection unit 3 which is provided with a tripping shaft 302, wherein the tripping shaft 302 can be operated manually or electrically to move transversely and vertically, the tripping shaft 302 is positioned between a transmission shaft 203 and a moving contact supporting piece 401, and when overload or short circuit occurs, the tripping shaft 302 is driven to move vertically, so that the tripping shaft 302 is separated from the transmission shaft 203 and the moving contact supporting piece 401 to carry out tripping and brake-separating protection.

The snap-action protection unit 3 is provided with a trip armature assembly 301 for the trip shaft 302 to drive the trip shaft 302 to move vertically. The trip armature assembly 301 includes an armature 301a and a trip sled 301b, the trip sled 301b having a transverse sled center hole 301b-1, the trip shaft 302 being mounted in the trip sled center hole 301b-1 such that the trip shaft 302 is movable laterally on the trip sled 301b and vertically with the trip sled.

The snap-action protection unit 3 is provided with a U-shaped magnetic yoke 305 and an armature 301a, wherein the bottom of the trip slider armature 301a is provided with a slider catching groove 301b-3, and the armature slider is arranged in the catching groove 301b-3 to be buckled with the trip slider 301 b. Therefore, the armature 301a is arranged in the U-shaped magnetic yoke, the trip copper bar 303 penetrates between the armature 301a and the U-shaped magnetic yoke 305 to get electricity, the trip slider 301b is connected with the armature 301a, and the trip slider return spring 304 respectively exerts force on the trip slider 301b and the U-shaped magnetic yoke 305, so that the trip slider 301b can reset. Here, the trip slider 301b is provided with a spring positioning hole 301b-2, and the slider return spring 304 can be inserted into the spring positioning hole 301b-2 for positioning, so that the slider return spring 304 is stable when it extends and contracts.

In the present invention, trip shaft 302 is in contact with movable contact support 401, rather than directly contacting movable contact 403. At this time, a support push rod 401a is further provided on the movable contact support 401, and the trip shaft 302 is brought into contact with or separated from the support push rod 401a, thereby realizing manual or electric switching on, switching off, or tripping off.

It can be understood that the snap-action protection unit 3 needs to take power, which is realized by the copper bar 303. At this time, a flexible connecting wire 404 is arranged between the copper bar 303 and the moving contact 403, and two ends of the flexible connecting wire 404 are respectively connected with the copper bar 303 and the moving contact 403, so as to meet the requirement of the movement of the moving contact 403.

Referring to fig. 17-21, the trip operation of the snap-action protection of the present invention includes 3 stages, wherein fig. 17 and 21 are initial and action complete states, respectively, fig. 18 shows a trip first stage state, fig. 19 shows a trip second stage state, and fig. 20 shows a trip third stage state; when a short-circuit fault occurs in a line of the power system, a short-circuit current occurs in the line, that is, the current in the line is extremely large, and at this time, when the static contact system 5 and the shunt detection system monitor the fault current, the bidirectional magnetic holding device is triggered to trip and open the brake; meanwhile, because the copper bar 303 penetrates through the middle of the armature 301a and the U-shaped magnetic yoke 305 on the tripping assembly 301 arranged in the transient protection unit 3, when a short-circuit large current flows, a magnetic field is generated between the U-shaped magnetic yoke 305 and the armature 301a, and thus the armature 301a drives the tripping sliding plate 301b and the tripping shaft 302 to rapidly move downwards together; because the tripping shaft 302 is arranged between the holes in the tripping sliding plate 301b, when the tripping shaft 302 is pulled out, the static state of the transmission shaft 203, the tripping shaft 302, the moving contact support 401 (moving contact support ejector 401a), the contact spring 402, the moving contact 403 and the static contact system 501 is broken, and the moving contact 403 and the moving contact support 401 rapidly move backwards under the action of the contact spring 402 and the dynamic return counter-force spring 405, so that tripping and opening of the circuit breaker are realized; further, the bidirectional magnetic holding device completes the opening action. Thereafter, the armature 301a and the trip plate 301b return to the initial position by the trip plate return spring 304, and the trip shaft 302 is also pushed to the initial position.

Fifth, contact system current and voltage detection mechanism and contact position detection and indication structure

Referring to fig. 22, the present invention includes contact position detection and system status indication, which is a contact system with current detection capability. Generally, the current detection in the prior art generally adopts a shunt screw to be fastened or welded in the middle of a main loop. In contrast, the utility model adopts a scheme of integrating the contact system and the shunt so as to reduce the internal resistance of the loop and reduce the operating power consumption of the product.

Referring to fig. 22, the device specifically includes a shunt 502, which is a flat plate bending type, one end of which is provided with a static contact 501 for contacting and separating with a moving contact 403 to realize the connection and disconnection of a main circuit, and the other end of the shunt 502 is welded with a wire inlet terminal binding clip 503 for reliable connection with a system circuit, and the pluggable function realizes easy maintenance. Here, the shunt 502 is divided into a shunt body 502b and a shunt lead 502a, and is disposed on one side of the shunt body 502b for taking out electricity and measuring current by the electronic control unit.

Sixth, emergency tripping device

The electric operation unit of the utility model is provided with a bidirectional magnetic holding actuating mechanism, and the structure of the bidirectional magnetic holding actuating mechanism is as shown in the specification. The mechanism can be operated manually or electrically, and the emergency tripping mechanism is mainly described below with reference to the description of the manual operation and the electric operation part mentioned above.

Referring to fig. 23-26, the structure and manner of the manual operation unit are shown, wherein fig. 23 is the initial state of the manual emergency trip structure, fig. 24 is the operation schematic diagram of the trip button when the manual trip button is pressed down, fig. 25 is the operation schematic diagram of the lock-unlock member when the lock-unlock member is pressed down, and fig. 26 is the operation schematic diagram of the operation handle when the operation handle is pulled out.

As described above, the circuit breaker of the present invention has a contact system structure with a trip function, which is provided with the snap-action protection unit 3, and can perform trip and opening protection by manual operation of the emergency trip mechanism.

As shown in fig. 23 to 26, the manual operation unit 1 includes an operation handle 101, a link 102, a lock release 103, an intermediate transmission 104, a trip button return spring 105, a trip button 106, a cam transmission 107, a trip armature assembly 301, and the like, and is operated in a manner described below.

In a closing state, the trip button 106 is pressed to push the cam transmission member 107 to rotate clockwise, the cam presses the trip sliding plate assembly 301 to move downwards, a product trips and is opened, meanwhile, the trip button 106 triggers the electronic control unit 9 to electrically operate, and the bidirectional magnetic holding device moves to an opening state. Upon release of trip button 106, trip plate assembly 301 returns to the initial position under the action of trip plate return spring 304, while trip button 106 returns to the initial state under the action of button return spring 105.

In addition, under the closing state, the product can be tripped and opened in advance when being installed in the power distribution cabinet, so that the safety of the product is ensured. The specific process is that a power distribution cabinet machine frame (not shown in the figure) presses the locking unlocking piece 103 to rotate anticlockwise, then presses the intermediate transmission piece 104 to rotate clockwise, further pushes the tripping button 106 to move leftwards, pushes the cam transmission piece 107 to rotate clockwise, presses the tripping sliding plate component 301 to move downwards, the product is tripped and is separated from a brake, meanwhile, the tripping button 106 triggers the electronic control unit 9 to operate electrically, and the bidirectional magnetic retaining device moves to a brake separating state. Upon release of the trip button 106, the trip plate assembly 301 returns to the initial position under the action of the trip plate return spring 304. Meanwhile, the trip button 106 returns to the initial state under the action of the button return spring 105, the locking and unlocking piece 103 bounces after entering the machine frame and is not pressed, and the circuit breaker returns to the initial state.

The operating handle 101 is pulled to drive the linkage piece 102 to move rightwards, and the breaker is opened (the specific process is shown in the manual operation part); the operating handle 101 is continuously pulled to drive the locking and unlocking piece 103 to rotate anticlockwise, the intermediate transmission piece 104 is further pressed to rotate clockwise, the tripping button 106 is further pushed to move leftwards, the cam transmission piece 107 is pushed to rotate clockwise, the cam presses the tripping sliding plate assembly 301 to move downwards, the product is tripped, and after the operating handle 101 is released, the tripping sliding plate assembly 301 returns to the initial position under the action of the tripping sliding plate return spring 304. Meanwhile, the trip button 106 returns to the initial state under the action of the button return spring 105, the locking and unlocking piece 103 is reset and is not pressed, the operating handle returns to the initial position under the action of the handle return spring, and the circuit breaker returns to the initial state.

Although the present embodiment has been described with reference to the accompanying drawings, it should be understood that the present invention is not limited to the above description, but various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the present embodiment.

Claims

1. A circuit breaker contact system is characterized by being provided with a bidirectional magnetic holding device and a snap-action protection unit, wherein the bidirectional magnetic holding device is provided with a transmission shaft which can be manually or electrically operated to move transversely, the snap-action protection unit is provided with a tripping shaft which can be manually or electrically operated to move transversely and vertically, the tripping shaft is positioned between the transmission shaft and a moving contact supporting piece, and the transmission shaft is provided with an energy storage mechanism and a holding mechanism; when the switch is switched on, the energy storage mechanism releases energy, moves towards the switch-on direction through the driving transmission shaft, the tripping shaft and the moving contact supporting piece, and provides switch-on holding force by the holding mechanism when the switch is switched on; when the brake is switched off, the movable contact support, the tripping shaft and the transmission shaft are reset towards the direction of the switch-off, and the holding mechanism provides a switch-off holding force and stores energy for the energy storage mechanism; when the tripping shaft is overloaded or in short circuit, the tripping shaft is driven to vertically move, so that the tripping shaft is separated from the transmission shaft and the moving contact supporting piece to carry out tripping and brake-separating protection.

2. The contact system of the circuit breaker according to claim 1, wherein the bidirectional magnetic holding device comprises a magnetic yoke, a magnetic steel, a movable iron core, a left static iron core and a right static iron core, the magnetic steel is fixedly arranged in the magnetic yoke, the movable iron core is arranged in the transmission shaft and accommodated in the magnetic yoke, the transmission shaft is transversely and movably arranged in the magnetic yoke, the left static iron core and the right static iron core are respectively fixed at two sides of the magnetic yoke, the magnetic steel and the right static iron core form a closing magnetic circuit so as to provide closing magnetic holding force when closing, and the magnetic yoke, the magnetic steel and the left static iron core form a opening magnetic circuit so as to provide opening magnetic holding force when opening; the energy storage mechanism can exert force on the movable iron core to accelerate switching-on.

3. The circuit breaker contact system of claim 2, wherein the energy storage mechanism comprises an energy storage spring, the energy storage spring being sleeved on the transmission shaft and located between the movable iron core and the left stationary iron core.

4. The circuit breaker contact system of claim 3, wherein the plunger is provided with a stored energy spring chamber, and wherein the stored energy spring is positionable by being loaded into the stored energy spring chamber.

5. The circuit breaker contact system of claim 1, wherein the snap-action protection unit is provided with a U-shaped yoke, an armature, a trip slider, and a trip slider return spring, the armature is mounted in the U-shaped yoke, a trip copper bar is inserted between the armature and the U-shaped yoke, the trip slider is coupled to the armature, the trip slider return spring exerts a force on the trip slider and the U-shaped yoke, respectively, and the trip shaft is movable along with the trip slider.

6. The circuit breaker contact system of claim 5, wherein the trip sled has a trip sled central aperture, and the trip shaft is received in the trip sled central aperture.

7. The circuit breaker contact system of claim 5, wherein the trip plate has a catch slot in a bottom thereof, and the armature is disposed in the catch slot to engage the trip plate.

8. The circuit breaker contact system of claim 5, wherein the trip plate defines a spring positioning hole, and wherein the return spring of the trip plate is received in the spring positioning hole for positioning.

9. The circuit breaker contact system of claim 5, wherein a flexible connecting line is provided in front of the trip copper bar and the movable contact support, and both ends of the flexible connecting line are respectively connected to the trip copper bar and the movable contact support.

10. The circuit breaker contact system as claimed in any one of claims 1 to 9, wherein the moving contact support is provided with a support pin, the trip shaft is brought into or out of contact with the support pin to effect manual or electric switching on, switching off or tripping off, and the moving contact support is provided with a moving contact spring and a return reaction spring to provide a switching-on pressure at the time of switching on and a switching-off restoring force at the time of switching off.