CN216928452U

CN216928452U - Bidirectional magnetic latching actuating mechanism of circuit breaker

Info

Publication number: CN216928452U
Application number: CN202123288006.8U
Authority: CN
Inventors: 朱华; 张进; 邓小军
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 bidirectional magnetic latching actuating mechanism of a circuit breaker, which comprises a transmission shaft capable of moving transversely, wherein the transmission shaft is provided with an energy storage mechanism and a retaining mechanism, a tripping shaft is arranged between the transmission shaft and a moving contact supporting piece, and the tripping shaft can move transversely and vertically; 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, the tripping shaft and the transmission shaft reset towards the brake opening direction, and the holding mechanism provides brake opening holding force and stores energy for the energy storage mechanism. The utility model can improve the reliability and response speed of the product.

Description

Bidirectional magnetic latching actuating mechanism of circuit breaker

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a breaker product, and specifically relates to a bidirectional magnetic latching actuating mechanism of a 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. The traditional plug-in circuit breaker with the automatic opening and closing function mainly adopts a motor and gear reduction structure, electric operation is realized through control of an electronic control board, a four-bar mechanism is adopted between the transmission of an opening and closing operation mechanism and a contact system, the technical scheme belongs to the technical scheme of the traditional mechanical circuit breaker and motor reduction mechanism, and sometimes a product cannot be reliably kept in a preset state after opening and closing is completed, the reliability of the product is not enough, and the response speed is not ideal enough.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a bidirectional magnetic latching actuating mechanism of a circuit breaker, which can improve the reliability and response speed of products.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: a bidirectional magnetic latching actuating mechanism of a circuit breaker comprises a transmission shaft capable of moving transversely, wherein the transmission shaft is provided with an energy storage mechanism and a retaining mechanism, a tripping shaft is arranged between the transmission shaft and a moving contact supporting piece, and the tripping shaft can move transversely and vertically; 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, 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.

Further, the holding mechanism is disposed in a bidirectional magnetic holding device having a closing magnetic circuit for applying a closing magnetic holding force to the transmission shaft at the time of closing and an opening magnetic circuit for applying an opening magnetic holding force to the transmission shaft at the time of opening.

Further, the yoke includes yoke skeleton and yoke end plate, and the yoke skeleton is the U-shaped, and the yoke end plate assembly is in yoke skeleton opening and fixed, and wherein yoke skeleton bottom and yoke end plate set up the yoke via hole respectively and wear to establish the transmission shaft.

Furthermore, a magnetic retainer is arranged and fixedly arranged in the magnetic yoke, and the magnetic steel, the movable iron core, the left static iron core and the right static iron core are respectively arranged in the magnetic retainer.

Further, the axial of magnetism holder is provided with the iron core through-hole, and transmission shaft, movable iron core and left side quiet iron core, right side quiet iron core are adorned respectively in the iron core through-hole, and wherein left side quiet iron core, right side quiet iron core are located the both ends of iron core through-hole respectively.

Furthermore, a magnetic steel mounting groove is formed in the middle of the periphery of the magnetic holder, coil winding grooves are formed in the two sides of the magnetic steel mounting groove in the periphery of the magnetic holder, the magnetic steel is mounted in the magnetic steel mounting groove, and the left coil and the right coil are respectively wound in the corresponding coil winding grooves.

Further, it is characterized in that the transmission shaft is connected with the operating handle through a linkage so as to be manually opened and closed by pushing the operating handle.

Compared with the prior art, the bidirectional magnetic latching actuator hook of the circuit breaker can complete switching-on and switching-off through the direct-acting type operation transmission shaft, the stability of the operating mechanism and the moving and static contacts after switching-on or switching-off is kept through the bidirectional magnetic latching device, in addition, the mechanism also accelerates the switching-on speed through the configuration of the energy storage spring, and not only is the response fast, but also the reliability is higher.

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 view of a bidirectional magnetic holding device of the circuit breaker of the present invention;

fig. 8 is a front view of the bidirectional magnetic retaining device of the circuit breaker of the present invention;

fig. 9 is a side view of the bi-directional magnetic retaining device of the circuit breaker of the present invention;

fig. 10 is a schematic view of a bidirectional magnetic keeper of the circuit breaker according to the present invention;

FIG. 11 is a cross-sectional view taken along line W-W of FIG. 10;

FIG. 12 is a diagram illustrating a state two of the bidirectional magnetic keeper of the circuit breaker according to the present invention;

FIG. 13 is a cross-sectional view taken at V-V in FIG. 12;

fig. 14 is a schematic view of a magnetic cage of a bidirectional magnetic holding device of a circuit breaker.

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.

As shown in fig. 2 to 6, 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 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. 7 to 14, 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 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.

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.

The utility model relates to a circuit breaker with a bidirectional magnetic holding function, wherein an operating mechanism of the circuit breaker is provided with a bidirectional magnetic holding device, an instantaneous protection unit 3, a moving contact system 4, a static contact system 5, a shunt detection system and the like, and can rapidly perform switching-off, switching-on and tripping-off, wherein the circuit breaker can be operated manually or electrically.

For convenience, the following description defines the closing direction as the right direction and the opening direction as the left direction.

During manual operation, the operating handle is pushed manually, so that the linkage piece is pushed to move forwards together, the linkage piece drives the transmission shaft 203 of the bidirectional magnetic holding device to move forwards together, the trip shaft 302 and the movable contact system 4 are further pushed to move forwards, the contacts of the movable contact system 4 and the static contact system 5 are closed and kept, and the circuit breaker is switched on; the operating handle is pulled manually, so that the linkage piece is pulled to move backwards together, the linkage piece 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 counter-force spring 405, and the movable contact system 4 and the static contact system 5 are separated and held, namely, the circuit breaker is disconnected.

When the magnetic switch is closed, magnetic holding force is provided by magnetic steel 204 of the bidirectional magnetic holding device and a closing magnetic circuit (right side) composed of a magnetic yoke end plate 202, a magnetic yoke framework 201 and a 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 connection is ensured; when the bidirectional magnetic holding device is disconnected, the closing magnetic circuit moves backwards due to manual pulling, an air gap is generated, further, the contact spring 402 and the counter force spring 405 provide counter force, so that the moving and static contacts are quickly separated, meanwhile, the tripping shaft 302 moves backwards under the action of the ejector rod of the moving contact support 401, the magnetic steel 204 of the bidirectional magnetic holding device and the opening magnetic circuit (left side) formed by the magnetic yoke end plate 202, the magnetic yoke framework 201 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 and static contacts is L1.

When in electric operation, the switch also comprises overload or short circuit protection actions besides the switch-on and switch-off. 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 switch is opened and closed manually or electrically, the default breaker and the distribution line are in a non-fault state, and 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 mandril 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.

Specifically, the present invention provides a snap-action protection unit 3 having a trip shaft 302, wherein the trip shaft 302 is manually or electrically operated to perform lateral movement and vertical movement, the trip shaft 302 is located between the transmission shaft 203 and the movable contact support 401, and when an overload or a short circuit occurs, the trip shaft 302 is driven to vertically move, so that the trip shaft 302 is separated from the transmission shaft 203 and the movable contact support 401 to perform trip and brake separation protection.

The snap-action protection unit 3 configures the trip shaft 302 with a trip armature assembly to drive the trip shaft 302 to move vertically. The trip armature assembly comprises an armature 301a and a trip slider 301b, the trip slider 301b is provided with a transverse slider central hole 301b-1, and the trip shaft 302 is mounted in the trip slider central hole 301b-1 so that the trip shaft 302 can move transversely on the trip slider 301b and vertically with the trip slider.

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.

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 bidirectional magnetic latching actuating mechanism of a circuit breaker is characterized by comprising a transmission shaft capable of moving transversely, wherein the transmission shaft is provided with an energy storage mechanism and a retaining mechanism, a tripping shaft is arranged between the transmission shaft and a moving contact supporting piece, and the tripping shaft can move transversely and vertically; 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, 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.

2. The bi-directional magnetic latching actuator of claim 1, wherein the holding mechanism is configured to a bi-directional magnetic latching device having a closing magnetic circuit and a separating magnetic circuit, wherein the closing magnetic circuit provides a closing magnetic holding force to the shaft when closing and the separating magnetic circuit provides a separating magnetic holding force to the shaft when separating.

3. The bidirectional magnetic latching actuator of claim 2, wherein the bidirectional magnetic latching 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 movably arranged in the magnetic yoke, the left static iron core and the right static iron core are respectively fixed on two sides of the magnetic yoke, the magnetic steel and the right static iron core form a closing magnetic circuit, and the magnetic yoke, the magnetic steel and the left static iron core form a separating magnetic circuit.

4. The bidirectional magnetic latching actuator of claim 3, wherein the energy storage mechanism is provided with an energy storage spring to provide an elastic force to accelerate the closing of the switch when the switch is closed, wherein the energy storage spring is sleeved on the transmission shaft and located between the movable iron core and the left static iron core, and the left end of the movable iron core is provided with an energy storage spring cavity to be filled with the energy storage spring for positioning.

5. The bi-directional magnetic latching actuator of claim 3 wherein there is an air gap between the moving core and the left stationary core and an air gap between the moving core and the right stationary core.

6. The bi-directional magnetic latching actuator of claim 3, wherein the yoke comprises a yoke frame and a yoke end plate, the yoke frame is U-shaped, the yoke end plate is fixed to the opening of the yoke frame, and the bottom of the yoke frame and the yoke end plate are respectively provided with a yoke through hole for passing through the transmission shaft.

7. The bidirectional magnetic latching actuator of claim 3, wherein a magnetic retainer is provided, the magnetic retainer is fixedly mounted inside the magnetic yoke, and the magnetic steel, the movable iron core, the left static iron core and the right static iron core are respectively mounted on the magnetic retainer.

8. The bidirectional magnetic latching actuator of claim 7, wherein the magnetic retainer has an axial core through hole, and the transmission shaft, the movable core, and the left and right stationary cores are respectively disposed in the core through hole, wherein the left and right stationary cores are respectively disposed at two ends of the core through hole.

9. The bidirectional magnetic latching actuator of claim 7, wherein a magnetic steel mounting groove is formed in the middle of the outer circumference of the magnetic holder, coil winding grooves are formed in the outer circumference of the magnetic holder on both sides of the magnetic steel mounting groove, the magnetic steel is mounted in the magnetic steel mounting groove, and the left coil and the right coil are respectively wound in the corresponding coil winding grooves.

10. The bidirectional magnetic latching actuator of any of claims 1 to 9, wherein the transmission shaft is connected to the operating handle through a linkage so as to be manually opened and closed by pushing the operating handle.