CN114388316A

CN114388316A - Circuit breaker contact system

Info

Publication number: CN114388316A
Application number: CN202111602775.2A
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: 2022-04-22
Anticipated expiration: 2041-12-24
Also published as: CN114388316B

Abstract

The invention discloses a circuit 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 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 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. The invention can improve the opening and closing speed and reliability.

Description

Circuit breaker contact system

Technical Field

The invention 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.

Disclosure of Invention

Aiming at the defects in the prior art, the invention 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 invention is as follows: a circuit breaker contact system comprises a moving contact system, a static contact and shunt detection system, and is configured 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; 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 invention 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 front view of the bidirectional magnetic retaining device of the circuit breaker of the present invention;

fig. 12 is a side view of the bi-directional magnetic retention device of the circuit breaker of the present invention;

fig. 13 is a schematic view of a bidirectional magnetic keeper of the circuit breaker of the present invention;

FIG. 14 is a cross-sectional view taken along line W-W of FIG. 13;

FIG. 15 is a diagram of a two-way magnetic latching device of the circuit breaker according to the present invention;

FIG. 16 is a cross-sectional view taken at V-V in FIG. 15;

fig. 17 is a schematic view of a magnetic cage of a bidirectional magnetic retention device of a circuit breaker according to the present invention;

fig. 18 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. 19 is a schematic cross-sectional view of a first stage of tripping of the circuit breaker of the present invention;

fig. 20 is a schematic cross-sectional view of a second stage trip condition of the circuit breaker of the present invention;

fig. 21 is a schematic cross-sectional view of a third stage of tripping of the circuit breaker of the present invention;

fig. 22 is a schematic view of an initial state of snap-action protection of the circuit breaker of the present invention;

fig. 23 is a schematic diagram of a first stage state of transient protection of the circuit breaker of the present invention;

fig. 24 is a schematic diagram of a second stage state of the circuit breaker transient protection of the present invention;

fig. 25 is a third state diagram illustrating snap-in protection of the circuit breaker of the present invention;

fig. 26 is a schematic diagram of an action ending state of the circuit breaker instantaneous protection unit according to the present invention;

fig. 27 is an assembly view of the circuit breaker contact position sensing and status indication of the present invention;

fig. 28 is a schematic view of an initial state of an emergency trip mechanism of the circuit breaker of the present invention;

fig. 29 is a schematic view of a circuit breaker trip button of the present invention in a depressed state;

fig. 30 is a schematic view of the circuit breaker with the circuit breaker lock release depressed;

fig. 31 is a schematic view showing a state where the circuit breaker operating handle is pulled out in accordance with the present invention;

FIG. 32 is a schematic view of a circuit breaker outlet terminal of the present invention;

FIG. 33 is a schematic view of the wiring portion of the housing of the outlet terminal of the circuit breaker in accordance with the present invention;

figure 34 is a schematic view of the circuit breaker terminal frame assembly of the present invention;

figure 35 is an exploded view of the circuit breaker terminal frame assembly of the present invention;

FIG. 36 is a first schematic view of a circuit breaker junction box according to the present invention;

FIG. 37 is a second schematic view of the structure of the circuit breaker connection frame of the present invention;

fig. 38 is a longitudinal sectional view of the circuit breaker junction box of the present invention;

fig. 39 is a schematic view of the construction of the terminal screw of the circuit breaker of the present invention;

FIG. 40 is a schematic view of a circuit breaker copper bar structure according to the present invention;

FIG. 41 is a first schematic diagram of a circuit breaker wiring spring of the present invention;

fig. 42 is a second schematic diagram of the structure of the circuit breaker connecting spring piece of the invention;

FIG. 43 is a schematic diagram of a state of a circuit breaker terminal spring according to the present invention;

fig. 44 is a schematic diagram of a rear spring plate structure of the circuit breaker according to the present invention;

fig. 45 is a schematic diagram of the state of the rear spring plate of the circuit breaker according to the present invention;

figure 46 is a schematic view of the circuit breaker terminal frame assembly of the present invention prior to wiring;

fig. 47 is a schematic diagram of the circuit breaker terminal frame assembly of the present invention after wiring.

In fig. 1-47, the relevant reference numbers are as follows:

1. a manual operation unit; 101. an operating handle; 102. a linkage member; 103. locking and unlocking parts; 104. an intermediate transmission member; 105. a trip button return spring; 106. a trip button; 107. a cam drive member; 2. an electrically operated unit (bidirectional magnetic retaining device); 201. a magnetic yoke; 202. a magnetic yoke; 203. a drive shaft; 204. magnetic steel; 205. a stationary iron core; 206. a movable iron core; 207. an energy storage spring; 208. a magnetic cage; 208a and a magnetic steel mounting groove; 208b, winding a coil winding groove; 208c, core through holes; 209. a coil; 3. a snap-action protection unit; 301. tripping the armature assembly; 301a, an armature; 301b, a trip slider; 301b-1, a slide plate central hole; 301b-2, slide plate spring positioning holes; 301b-3, a slide plate catching groove; 302. tripping the shaft; 303. copper bars; 304. Tripping a return spring of the sliding plate; 305. a U-shaped magnetic yoke; 4. a moving contact system; 401. a moving contact support; 401a, a mandril; 402. a contact spring; 403. a moving contact; 404. flexible connection; 405. a counter-force spring; 5. a static contact system (including a shunt detection system); 501. static contact; 502. a flow divider; 502a, a lead-out line; 502b, shunt body (resistor); 503. a wire inlet end jointing clamp; 6. an arc extinguishing system; 7. the incoming line end (main loop and control signal wiring); 8. an outlet terminal (fast wiring of a user main loop); 801. a wiring frame; 801a, a threaded hole; 801b, T-shaped structure; 801c, pin shaft holes; 801d, installing a positioning hole; 801e, a limiting groove; 801f, binding screw support; 802. a binding screw; 802a, screw head; 802b, a tapered structure; 802c, a stud; 802d, back end; 802e, tapered structures; 802f, end face; 803. pressing the elastic sheet; 803a, a hole; 803b, a first wire pressing claw; 803c, a second wire pressing claw; 803d, guide groove; 804. a shaft; 805. a rear spring plate; 805a, positioning holes; 805b, oblique sheets; 801e, a limiting groove; 806. copper bars; 806a, bending a plate; 9. an electronic control and man-machine interaction unit; 901. a mechanism motion monitoring mechanism; 902. a contact position monitoring mechanism; 903. a circuit breaker status indication mechanism; 10. a housing; 10a, wiring holes; 10b, screw operating holes; 10c, a cavity; 10d, positioning the convex hull.

Detailed Description

The invention 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 invention 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. 1-42, 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 invention 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, during the operation, because of the energy storage spring, the forward force of the transmission shaft 203 is greater than the reverse force during the closing, which is beneficial to the rapid closing.

In the invention, 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 invention, the MCU is provided with an auxiliary power supply (aux power) 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 to 9, the circuit breaker of the present invention is provided with a transmission shaft 203 that can be manually or electrically operated to perform lateral movement and a trip shaft 302 that can be manually or electrically operated to perform lateral movement and vertical movement, the trip shaft 302 being located between the transmission shaft 203 and a movable contact support 401, the transmission shaft 203 being 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 invention, 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. 7 to 17, the bidirectional magnetic holding device includes a magnetic yoke, which includes a magnetic yoke frame 201 and a magnetic yoke end plate 202, the magnetic yoke frame 201 is U-shaped, the magnetic yoke end plate 202 is assembled at an opening of the magnetic yoke frame 201 and fixed, wherein the bottom of the magnetic yoke frame 201 and the magnetic yoke end plate 202 are respectively provided with a magnetic yoke through hole to penetrate through a transmission shaft 203. Like this, make magnet steel 204 fixed mounting inside the yoke, movable iron core 206 adorns in transmission shaft 203 and hold in the yoke intracavity, transmission shaft 203 activity is adorned in the yoke, left side quiet iron core and right side quiet iron core 205 are fixed in the yoke both sides respectively, wherein yoke, magnet steel and left side quiet iron core constitute the separating brake magnetic circuit, yoke, magnet steel and right side quiet iron core constitute closing magnetic circuit, separating brake magnetic circuit provides separating brake magnetism confining force for transmission shaft 203 when separating brake is accomplished, closing magnetic circuit provides closing brake magnetism confining force for transmission shaft 203 when closing brake is accomplished.

In particular, a magnetic holder 208 is further arranged, the transmission shaft 203, the magnetic steel 204, the movable iron core 206, the left static iron core and the right static iron core 205 are respectively arranged in the magnetic holder 208, the magnetic holder 208 is fixedly arranged in the magnetic yoke, and the magnetic steel 204, the movable iron core 206, the left static iron core and the right static iron core 205 are respectively arranged in the magnetic holder 208. Here, an iron core through hole 208c is axially arranged on the magnetic holder 208, the transmission shaft 203, the movable iron core 206, and the left and right stationary iron cores 205 are respectively installed in the iron core through hole 208c, wherein the left and right stationary iron cores 205 are respectively located at two ends of the iron core through hole 208 c; in addition, a magnetic steel mounting groove 208a is formed in the middle of the outer periphery of the magnetic holder 208, coil winding grooves 208b are formed in the outer periphery of the magnetic holder 208 on two sides of the magnetic steel mounting groove 208a, the magnetic steel 204 is mounted in the magnetic steel mounting groove 208b, and coils 209 on two sides are wound in the corresponding coil winding grooves 208c respectively.

In addition, a corresponding energy storage mechanism is arranged in the bidirectional magnetic holding device, and the energy storage mechanism specifically comprises an energy storage spring 207, wherein the energy storage spring 207 is sleeved on the transmission shaft 203 and is positioned between the movable iron core 206 and the left static iron core 205, so that energy is stored during opening, and energy is released during closing to accelerate closing speed. Here, the plunger 206 is provided with a storage spring cavity, and the storage spring 207 can be loaded into the storage spring cavity for positioning so as to maintain the stability of the 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. 18, 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. 19-21, 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 also to fig. 22-26, the circuit breaker opening and closing and tripping protection process is shown, as described below.

For convenience, the following description will be made in detail with reference to the following description, where the right direction is defined as a closing direction and the left direction is defined as an opening direction.

(I) Manual operation

As shown in fig. 19 to fig. 26, and referring to fig. 28 and fig. 31 together, the operating handle 101 is pushed manually, 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, 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 switch 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 invention 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, the trip shaft 302 is in contact with the movable contact support 401, rather than directly contacting the 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. 22-26, the trip operation of the snap-action protection of the present invention includes 3 stages, wherein fig. 22 and 26 are initial and complete states, respectively, fig. 23 shows a first stage state of trip, fig. 24 shows a second stage state of trip, and fig. 25 shows a third stage state of trip; 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 therefore the armature 301a drives the tripping sliding plate 301b and the tripping shaft 302 to move downwards quickly 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. 27, the present invention includes contact position detection and system status indication, which is a contact system with current detection. Generally, the current detection in the prior art is generally fastened or welded in the middle of the main circuit by using a shunt screw. In contrast, the invention 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. 27, 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 invention 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. 28-31, the structure and manner of the manual operation unit are shown, wherein fig. 28 is the initial state of the manual emergency trip structure, fig. 29 is the operation schematic diagram of the trip button when the manual trip button is pressed down, fig. 30 is the operation schematic diagram of the lock-release member when the lock-release member is pressed down, and fig. 31 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. 28 to 31, 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 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 tripping sliding plate assembly 301 is pressed to move downwards, the product is tripped and is separated, 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 reset 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.

Seven, leading-out terminal wiring structure

The invention further improves the structure of the circuit breaker outlet end and the wiring frame assembly, which is concretely described as follows.

Referring to fig. 32, it is a schematic diagram of the outlet terminal of the circuit breaker of the present invention, which is used for fast connection of the user main circuit. The outlet terminal structure is composed of the housing 10 and the terminal frame assembly 8, and the specific structure is as follows.

Referring to fig. 33, the structure of the wiring portion of the housing is shown. The front end of the shell 10 is provided with a wiring hole 10a and a wiring screw operation hole 10b for wiring of a customer; the side surface of the wiring frame is provided with a cavity 10c and a positioning convex hull 10d which are used for installing and fixing the wiring frame 8.

Referring to fig. 34 to 47, structures of a wiring frame assembly of a circuit breaker are shown, where fig. 34 to 35 are schematic diagrams of the structure and explosion of the wiring frame assembly, fig. 36 to 38 are schematic diagrams of the structure of the wiring frame, fig. 39 is a schematic diagram of a structure of a wiring screw, fig. 40 is a schematic diagram of a structure of a copper bar, fig. 41 to 43 are schematic diagrams of a structure and a state of a wiring spring plate, fig. 44 to 45 are schematic diagrams of a structure and a state of a rear spring plate, fig. 46 is a schematic diagram of the wiring frame assembly before wiring, and fig. 47 is a schematic diagram of the wiring frame assembly after wiring. This is explained in detail below with reference to fig. 34 to 47.

As shown in fig. 34-35, which illustrate a structure and an explosion diagram of the wire frame assembly, the wire frame assembly 8 is installed in the inner cavity 10c of the housing 10, and is composed of a wire frame 801, a wire connection screw 802, a wire pressing elastic piece 803, a shaft 804, a positioning elastic piece 805, and a busbar 806. The wiring frame 801 is of a cage structure, is mounted in the cavity 10c of the housing 10 through the mounting positioning hole 801d, and is limited by the mounting positioning hole 801d, so that the wiring frame assembly 8 is assembled in the housing 10.

As shown in fig. 36-38, the wire frame 801 has a cage structure, and a threaded hole 801a is formed at the front end to mate with a stud 802c provided on the binding screw 802; the rear end is provided with a limiting groove 801e, and an inclined piece 805b arranged on the rear elastic piece 805 is clamped in the limiting groove 801e to realize fixation so as to avoid falling off; the upper ends of the two sides are provided with T-shaped structures 801b which are matched with bent plates 806a with T-shaped grooves arranged on the copper bars 806 to realize front-back and up-down limiting; the upper ends of the two sides are also provided with pin shaft holes 801c, the shaft 804 passes through the pin shaft holes 801c and the holes 803a on the wire pressing elastic sheet 803, and the wire pressing elastic sheet 803 can turn over in the wire frame 801 around the shaft 804; the two sides of the wiring frame 801 are further provided with mounting positioning holes 801d for matching with the positioning convex hulls 10d arranged in the cavity 10c of the shell 10 to realize mounting and positioning. In addition, a terminal screw support portion 801f is provided at the bottom of the terminal frame 801 to support the terminal screw.

As shown in fig. 39, the front end of the binding screw 802 is provided with a screw head 802a, including but not limited to a cross slot, a straight slot, an inner hexagon slot, etc.; the front end of the stud 802c is a conical structure 802b, and positioning with a threaded hole 801a arranged on the wire frame 801 is realized; the stud 802c is matched with a threaded hole 801a at the front end of the wire frame 801; the diameter of the rear end 802d is larger than that of the stud 802c, and the end face 802f is used for limiting the reverse screwing-out of the screw, so that the situation that the wiring screw 802 is detached by a user and falls off the wiring frame 801 is avoided; the rear end is provided with a tapered structure 802e which is matched with the positioning hole 805a set by the rear elastic sheet 805, namely, the wiring screw 802 is erected between the wiring frame 801 and the rear elastic sheet 805. When the binding screw 802 is screwed into the rear cone-shaped structure 802e to push the wire pressing elastic sheet 803 to turn over, the rear cylindrical surface 802d abuts against the wire pressing elastic sheet 803 to keep at the wire pressing position, so as to realize reliable wire connection.

As shown in fig. 40, the copper bar 806 is provided with a bent plate 806a with a T-shaped groove, which is matched with the wire frame, so as to be convenient for positioning after being assembled in place.

As shown in fig. 41-43, the terminal spring 803 is bent and rolled with a hole 803a matching with the shaft 804, and a first wire pressing claw 803b and a second wire pressing claw 803c for pressing a wire or a terminal, i.e., at least one wire pressing claw of the terminal spring; a guiding groove 803d is further provided, which cooperates with a tapered surface 802e provided on the binding screw 802 to perform a guiding turn-over to ensure reliable binding, and the initial state and the deformed state thereof are respectively indicated by T1 and T2.

As shown in fig. 44-45, the binding screws 802 are prevented from being disengaged from the threaded holes 801a of the wire frame 801, and are unscrewed to prevent damage to the wire frame assembly by violent handling, but are secured in such a manner that the binding screws 802 are reversely unscrewed, and the initial state and the deformed state thereof are respectively represented by Z1 and Z2.

As shown in fig. 46 to 47, the wiring front-rear state is shown. When the initial state is not wiring, the wiring screw 802 is on the outside, and the wire pressing elastic piece 803 is not stressed and is in a loose state, as shown in fig. 39. When wiring, a wire or a wiring terminal is inserted into the wiring hole 10a on the face mask of the housing 10, the wiring screw 802 is operated, and as the wiring screw is screwed into the wiring frame 801, the conical surfaces and the cylindrical surfaces of the

features

802d and 802e push the wire pressing elastic piece 803 to turn around the shaft 804 counterclockwise, when the first and

second claws

803b and 803c press the wire or the wiring terminal, the wiring screw 802 is continuously operated to screw into the wiring frame 801, and the first and

second claws

803b and 803c press the wire or the wiring terminal. At this time, the terminal 802 is continuously operated to screw into the inside of the frame 801, and finally the screw is removed from the screw hole 801a provided in the frame 801, as shown in fig. 40.

The wire outlet end adopts the rapid wiring mode, has the functions of preventing violent operation and the like, and can avoid product damage caused by artificial violent wiring. It should be noted that, each of the elastic sheet structures in the above-mentioned outlet end structure is only used for convenience of description, and is not used for limiting the specific type of the elastic member.

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 breaker contact system comprises a moving contact system, a static contact and a shunt detection system, and is characterized in that a bidirectional magnetic holding device and a snap protection unit are configured, 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 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 configured 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.