CN216928451U - Emergency tripping mechanism of circuit breaker - Google Patents

Abstract

The utility model discloses an emergency tripping mechanism of a circuit breaker, wherein the circuit breaker is switched on by driving a transmission shaft, a tripping shaft and a movable contact supporting piece to move towards the switching-on direction, and is switched off by resetting the movable contact supporting piece, the tripping shaft and the transmission shaft towards the switching-off direction. The utility model can improve the safety of the product.

Description

Emergency tripping mechanism of circuit breaker

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a circuit breaker product, and specifically relates to an emergency tripping mechanism of a circuit breaker.

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 inlet and outlet wires at all levels of a low-voltage distribution system, power control of various mechanical equipment and control and protection of 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. Traditional bayonet circuit breaker of taking automatic divide-shut brake function adopts motor + gear reduction structure more, realize electric operation through electronic control panel control, wherein divide-shut brake operating device transmission to adopt four-bar linkage mechanism between the contact system, belong to traditional mechanical type circuit breaker + motor reduction gears's technical scheme, it can the dropout protection when transshipping or short-circuit fault, nevertheless can not carry out the automatic dropout when the circuit breaker is packed into the switch board and needs the circumstances such as maintenance change into closing a floodgate, there is the potential safety hazard from this, finally influence system safety.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide an emergency tripping mechanism of a straight circuit breaker so as to improve the safety of a product.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: the circuit breaker is provided with a tripping button and a cam transmission piece, the cam transmission piece can rotate around a shaft, the tripping button drives a tripping sliding plate of the tripping shaft to move downwards by pushing the cam transmission piece to rotate, so that the tripping shaft is driven to be separated from the transmission shaft and the moving contact supporting piece to realize tripping and separating.

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, the tripping slide plate is provided with a U-shaped magnetic yoke and an armature, 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 slide plate is connected with the armature, a resetting spring of the tripping slide plate respectively exerts force on the tripping slide plate and the U-shaped magnetic yoke, and the tripping shaft can move along with the tripping slide plate.

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 contact support, and two ends of the flexible connecting line are respectively connected with the tripping copper bar and the moving contact support.

Furthermore, the tripping shaft is combined with or separated from the ejector rod of the moving contact supporting piece, wherein the moving contact supporting piece is provided with a contact spring and a contact supporting piece resetting counter-force spring.

Further, the circuit breaker is provided with an operating handle which can be pushed in or pulled out of the circuit breaker housing and which can drive or release the trip button via an intermediate transmission.

Further, the circuit breaker is provided with a locking and unlocking piece, which is pressed and rotated when the circuit breaker is inserted into the distribution cabinet frame, and drives or releases the trip button through an intermediate transmission piece.

Further, when the tripping shaft is disconnected with the transmission shaft, the opening magnetic circuit of the bidirectional magnetic holding device provides opening magnetic holding force for the transmission shaft.

Compared with the prior art, the utility model provides an emergency tripping mechanism of a circuit breaker, which comprises a tripping button, a cam transmission member, a tripping sliding plate and the like, and can realize emergency tripping by pressing the tripping button, thereby ensuring reliable tripping protection in an emergency state; in addition, when the breaker is closed and installed in the power distribution cabinet, tripping and opening can be performed at first, so that potential safety hazards are reduced.

Drawings

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

FIG. 2 is a schematic sectional view of the circuit breaker in an open state according to the present invention;

FIG. 3 is a schematic cross-sectional view of the closing state of the circuit breaker according to the present invention;

FIG. 4 is a first schematic diagram of the circuit breaker operating mechanism of the present invention;

FIG. 5 is a second schematic diagram of the circuit breaker operating mechanism of the present invention;

fig. 6 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. 7 is a schematic diagram of an initial state of transient protection of the circuit breaker according to the present invention;

fig. 8 is a schematic diagram of a first stage state of transient protection of the circuit breaker of the present invention;

FIG. 9 is a schematic diagram of a second stage state of the circuit breaker transient protection of the present invention;

fig. 10 is a third state diagram illustrating snap-in protection of the circuit breaker of the present invention;

fig. 11 is a schematic diagram of an action ending state of a circuit breaker instantaneous protection unit according to the present invention;

fig. 12 is a schematic view of an initial state of an emergency trip mechanism of the circuit breaker of the present invention;

fig. 13 is a schematic view of a circuit breaker trip button of the present invention in a depressed state;

fig. 14 is a schematic view of the circuit breaker with the circuit breaker lock release depressed;

fig. 15 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, 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 snap protection unit 3, a moving contact system 4, a static contact system 5 (including a shunt detection system), an arc extinguishing system 6, a line inlet end (main loop and control signal connection) 7, a line outlet end (user main loop fast connection) 8, an electronic control and human-computer interaction unit 9 (including a mechanism motion monitoring 901 mechanism, a contact position monitoring 902 detection mechanism, a circuit breaker state indication mechanism 903, etc.), and a housing 10, etc., and can perform manual or electric switching on and off and tripping off protection, wherein a gap between the moving contact and the static contact is represented by L1.

Referring to fig. 2-6, 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.

In order to ensure that the closing and opening and closing of the circuit breaker are stable and reliable, the bidirectional magnetic retaining device is provided with a corresponding bidirectional retaining actuating mechanism, particularly a bidirectional magnetic retaining device, can quickly and reliably perform opening and closing, and provides magnetic retaining force to ensure the stable state of the circuit breaker when the opening and closing are completed.

As shown in fig. 7 to 11, 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; when overload or short circuit occurs, the tripping shaft 302 is driven to vertically move, so that the tripping shaft 302 is separated from the transmission shaft 203 and the moving contact support 401 to perform tripping and brake-separating protection. 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 addition, 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 the transmission shaft 203 and the movable contact support 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 movable contact support 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 is further provided on the moving contact support 401, and the trip shaft 302 is in contact with or separated from the support push rod to implement 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. 7-11, the trip operation of snap-action protection of the present invention includes 3 stages, wherein fig. 7 and 11 are initial and complete states, respectively, fig. 8 shows a first stage state of trip, fig. 9 shows a second stage state of trip, and fig. 10 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 retention of the transmission shaft 203, the tripping shaft 302, the moving contact support 401 (moving contact support ejector rod 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, 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.

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.

Referring to fig. 12-15, the structure and manner of the manual operation unit are shown, wherein fig. 12 is the initial state of the manual emergency trip structure, fig. 13 is the operation schematic diagram of the trip button when the manual trip button is pressed down, fig. 14 is the operation schematic diagram of the lock-unlock piece when the lock-unlock piece is pressed down, and fig. 15 is the operation schematic diagram of the operation handle when the operation handle is pulled out.

As shown in fig. 12 to 15, 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.

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 therein by those skilled in the art without departing from the spirit and scope of the present embodiment.

Claims (10)

1. The utility model provides a circuit breaker emergency tripping device, the circuit breaker is through the drive transmission shaft, trip shaft and moving contact supporting member move towards the combined floodgate direction and close a floodgate, through moving contact supporting member, trip shaft and transmission shaft reset towards the direction of separating brake and carry out the separating brake, a serial communication port, the circuit breaker is provided with trip button and cam driving medium, cam driving medium can pivoting, trip button moves down through promoting the trip slide that the cam driving medium rotated the drive trip shaft, break away from and realize the tripping separating brake with drive shaft and moving contact supporting member.

2. The emergency trip mechanism of a circuit breaker of claim 1, wherein the trip sled has a trip sled central aperture, and the trip shaft is received in the trip sled central aperture.

3. The emergency trip mechanism of circuit breaker according to claim 1, wherein the trip slider is provided with a U-shaped yoke and an armature, 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 respectively exerts a force on the trip slider and the U-shaped yoke, and the trip shaft is movable along with the trip slider.

4. The emergency trip mechanism of circuit breaker of claim 3, wherein the bottom of the trip slider is provided with a catch slot, and the armature is disposed in the catch slot to engage the trip slider.

5. The emergency trip mechanism of circuit breaker of claim 3, wherein the trip plate defines a spring positioning hole, and wherein the slide return spring is received in the spring positioning hole for positioning.

6. The emergency trip mechanism of circuit breaker according to claim 3, wherein a flexible connecting line is provided in front of the trip copper bar and the contact support, and both ends of the flexible connecting line are respectively connected to the trip copper bar and the movable contact support.

7. The emergency trip mechanism of a circuit breaker of claim 1, wherein the trip shaft is coupled to or uncoupled from a top bar of the movable contact support, wherein the movable contact support has a contact spring and a contact support return reaction spring mounted thereon.

8. The circuit breaker emergency trip mechanism of claim 1, wherein the circuit breaker is configured with an operating handle that can be pushed in and pulled out of the circuit breaker housing and that can drive or release the trip button via an intermediate transmission.

9. The circuit breaker emergency trip mechanism of claim 1, wherein the circuit breaker is configured with a lock-out release that is depressed to rotate when the circuit breaker is inserted into the cabinet frame and that actuates or releases the trip button via an intermediate transmission.

10. The circuit breaker emergency trip mechanism of any of claims 1-9, wherein the trip shaft provides a trip magnetic holding force to the drive shaft through a trip magnetic circuit of the bi-directional magnetic holding device when the trip shaft is disengaged from the drive shaft.

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