CN216450580U - Circuit breaker - Google Patents

Abstract

A circuit breaker comprises an operating mechanism and a driving module, wherein the driving module comprises a control loop, a motor and a transmission mechanism, the control loop comprises a closing circuit and an opening circuit which drive the motor to perform closing or opening rotation, the switching-off line and the switching-on line are respectively connected in series with a one-way conduction element, the motor is driven by the switching-off line and the switching-on line after conduction to carry out switching-on or switching-off rotation, the on-off of the auxiliary circuit is controlled by a first microswitch, the transmission mechanism triggers the first microswitch to conduct the auxiliary circuit when opening and closing rotation is carried out, when the breaker is switched on or switched off, the transmission mechanism triggers the switching of the conduction state of the switching-on line and the switching-off line, the auxiliary line in the conduction state drives the motor to continue rotating, and triggering the first micro switch to disconnect the auxiliary line when the transmission mechanism is in the switching-on position or the switching-off position. The control loop of the utility model is simple, and the precise and high-efficiency control of the motor is realized by matching with the transmission mechanism.

Description

Circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus, in particular to a circuit breaker.

Background

A circuit breaker is a common switching element used in an electric power system to turn on and off an electric circuit and automatically break the electric circuit when an overcurrent or leakage fault occurs in the electric circuit. The circuit breaker usually has an automatic switching function, but the automatic switching function is mostly realized by a gear mechanism, when the circuit breaker performs switching-on and switching-off motions, if the gear mechanism performs switching-on and switching-off rotation respectively, the circuit breaker usually needs a complex physical structure and circuit realization, resulting in a complex overall structure of the circuit breaker, and if the gear mechanism rotates along one direction all the time, a malfunction due to poor matching is easily generated, so that the reliability of the circuit breaker is reduced.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a circuit breaker with simple structure and high reliability.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a circuit breaker comprises an operating mechanism and a driving module, wherein the driving module is matched with the operating mechanism to realize automatic opening and closing of the circuit breaker, the driving module comprises a control loop, a motor connected with the control loop and a transmission mechanism driven by the motor,

the control circuit comprises a closing circuit and an opening circuit which are connected in parallel, the closing circuit and the opening circuit are kept in one connection and one disconnection, unidirectional conduction elements are respectively connected in series in the closing circuit and the opening circuit, the current conduction directions of the unidirectional conduction elements of the opening circuit and the closing circuit are opposite, when the closing circuit is connected, closing voltage is applied to the closing circuit to drive the motor to perform closing rotation, when the opening circuit is connected, opening voltage with the polarity opposite to that of the closing voltage is applied to the opening circuit to drive the motor to perform opening rotation, the control circuit also comprises an auxiliary circuit which is connected with the closing circuit and the opening circuit in parallel, the on-off of the auxiliary circuit is controlled by a first microswitch, a transmission mechanism triggers the first microswitch to conduct the auxiliary circuit when the opening and closing rotation is performed, when the circuit breaker is in place and the opening is in place, the transmission mechanism firstly triggers the switching of the conduction state of the closing line and the opening line, the auxiliary line in the conduction state drives the motor to continue rotating, and the first microswitch is triggered to disconnect the auxiliary line when the transmission mechanism is in the closing position or in the opening position.

Furthermore, the on-off of the switching-off line and the switching-on line are respectively controlled by a second micro switch and a third micro switch, and when the circuit breaker is switched on or switched off in place, the transmission mechanism simultaneously triggers the second micro switch and the third micro switch to control the on-off of the switching-on line and the switching-off line.

Furthermore, the switching-on circuit and the switching-off circuit are controlled by a group of normally closed contacts and a group of normally open contacts, the on-off of the normally closed contacts and the on-off of the normally closed contacts are respectively controlled by a second micro switch and a third micro switch, and the transmission mechanism enables the switching-on circuit and the switching-off circuit to be kept in one on-off state by triggering the second micro switch and the third micro switch.

Further, the second microswitch is in linkage connection with a button of the third microswitch, and when the breaker is switched on in place, the transmission mechanism triggers the second microswitch and the third microswitch to switch the conduction state of a switching-on line and a switching-off line.

Further, when the breaker is in place from the opening to the closing, the conducting closing line and the auxiliary line drive motor drive the closing rotation, when the breaker is in place from the closing to the opening, the conducting opening line drive motor drives the opening rotation, and then the conducting auxiliary line drive motor continues to drive the opening rotation.

Further, drive mechanism includes first incomplete gear, the lever with motor, operating device linkage respectively, and first incomplete gear is used for triggering first micro-gap switch, and the lever is used for triggering second micro-gap switch and third micro-gap switch, first micro-gap switch is fixed to be set up in one side of first incomplete gear, and second micro-gap switch and third micro-gap switch are fixed to be set up between lever and operating device.

Further, first incomplete gear includes first fan-shaped gear portion, and when drive mechanism combined floodgate put in place, the head end of first fan-shaped gear portion leaned on with first micro-gap switch's button, and after drive mechanism separating brake put in place, the tail end of first fan-shaped gear portion leaned on with first micro-gap switch's button, and at the divide-shut brake rotation in-process, first fan-shaped gear portion separated with first micro-gap switch's button.

Further, the lever includes sectorial lever body the one end of lever body is equipped with the shaft hole the other end of lever body is equipped with the connecting hole, the connecting hole is used for being connected with operating device's connecting rod linkage, and second micro-gap switch and third micro-gap switch set up lever body one side near the connecting hole, when the circuit breaker is closed a floodgate or the separating brake targets in place, trigger second micro-gap switch and third micro-gap switch simultaneously by the lateral wall of lever body, when the circuit breaker is opened a floodgate or is closed a floodgate and targets in place, second micro-gap switch and third micro-gap switch are left to the one end tip of lever body.

The transmission mechanism further comprises a second incomplete gear, the second incomplete gear is coaxially and rotatably assembled with the lever in a driving way and is matched with the first incomplete gear in a driving way, and the first incomplete gear drives the second incomplete gear to perform opening and closing rotation; in the switching-on and switching-off process, the first incomplete gear is matched with the second incomplete gear located at the initial position, so that the second incomplete gear drives the lever to perform switching-off rotation or switching-on rotation, and the directions of the switching-off rotation and the switching-on rotation are opposite.

Furthermore, operating device includes the rotor plate of rotation assembly in the shell the rotor plate is last to rotate and is provided with jump knot and hasp, jump the knot with the one end hasp cooperation of hasp, the one end of jumping the knot is connected with the connecting rod, the connecting rod is used for being connected with drive mechanism's lever linkage.

In the circuit breaker, the conduction of the closing circuit and the opening circuit is switched by the transmission mechanism when the circuit breaker is in place for opening or closing, so that the circuit switching can be ensured not to be advanced or delayed.

In addition, the second microswitch and the third microswitch are in one closed state and one open state, the buttons of the two microswitches are linked, and the lever is used for switching and conducting the circuit by triggering one of the microswitches, so that misoperation is avoided.

Drawings

FIGS. 1-2 are schematic structural views of a drive module according to the present invention;

FIG. 3 is a schematic structural diagram of the driving module and the operating mechanism when the transmission mechanism is switched on in place;

FIG. 4 is a schematic structural diagram of the driving module and the operating mechanism when the transmission mechanism is in the open position;

FIG. 5 is a schematic view of the second partial gear and the return spring in the initial position according to the present invention;

fig. 6 is a schematic structural view of a second incomplete gear and a return spring when the circuit breaker is closed in place in the utility model;

FIG. 7 is a schematic structural view of a second incomplete gear and a return spring in the utility model when the circuit breaker is in the opening position;

FIG. 8 is a schematic view of the first and second partial gears of the present invention;

FIG. 9 is a schematic view of a second partial gear and lever according to the present invention;

FIG. 10 is a schematic view of a second partial gear according to the present invention;

FIG. 11 is a schematic view of the lever of the present invention;

FIG. 12 is a circuit diagram of the control loop of the present invention in the open state;

FIG. 13 is a circuit diagram of the control loop during the switching from off to on in the present invention;

FIG. 14 is a circuit diagram of the control circuit of the present invention in a closed state;

fig. 15 is a circuit diagram of the control circuit during the process from closing to opening in the present invention.

Detailed Description

The following describes a circuit breaker according to an embodiment of the present invention with reference to fig. 1 to 15. A circuit breaker of the present invention is not limited to the description of the following embodiments.

The utility model provides a circuit breaker, includes shell 6 and sets up manual operation spare, operating device 5 and contact mechanism in shell 6, manual operation spare is connected with operating device 5 linkage, and contact mechanism includes moving contact and the static contact of mutually supporting, and the moving contact is connected with operating device 5 linkage, drives operating device 5 through manual operation spare and makes the moving contact keep away from or be close to the static contact and make the circuit breaker by manual divide-shut brake, and wherein manual operation spare can be the handle mechanism who rotates the setting on shell 6, also can be the button mechanism with shell 6 sliding fit. And an arc extinguishing device is arranged on one side of the contact mechanism and is used for extinguishing electric arcs generated by opening and closing of the contact mechanism. An overload protection mechanism and/or a short-circuit protection mechanism matched with the operating mechanism 5 can be further assembled in the shell 6, and when overload or short-circuit faults occur, the overload protection mechanism or the short-circuit protection mechanism triggers the operating mechanism 5 to trip, so that the protection function of the circuit breaker is realized.

And a driving module which is in linkage connection with the operating mechanism 5 is further arranged in the shell 6, and the driving module is matched with the operating mechanism 5 to realize automatic opening and closing of the circuit breaker. The driving module comprises a control loop, a motor M and a transmission mechanism, wherein the control loop comprises a closing circuit and an opening circuit, and closing voltage and opening voltage with opposite polarities are respectively applied to the closing circuit and the opening circuit to enable the motor M to perform closing rotation and opening rotation in opposite directions, so that the transmission mechanism connected to the motor M drives the operating mechanism 5 to perform opening and closing actions.

One improvement of the present application is that, as shown in fig. 1-4, the transmission mechanism comprises a first incomplete gear 1, a second incomplete gear 2 and a lever 3 which are rotatably assembled in a shell 6, a return spring 4 is assembled between the second incomplete gear 2 and the shell 6, an operating mechanism 5 is in linkage connection with the lever 3, and the lever 3 and the second incomplete gear 2 are coaxially assembled and are in driving fit; in the switching-on and switching-off process, the first incomplete gear 1 is matched with the second incomplete gear 2 located at the initial position, the second incomplete gear 2 drives the lever 3 to perform switching-off rotation or switching-on rotation, after the circuit breaker is switched on and switched off in place, the reset spring 4 drives the second incomplete gear 2 to rotate to the initial position, and the switching-off rotation and the switching-on rotation are opposite in direction. Two incomplete gears in the transmission mechanism are matched with each other to rotate, and the second incomplete gear 2 is reset by the drive of the reset spring 4 after the opening and closing of the circuit breaker are in place, so that the structure and the matching process are simple, the misoperation of poor matching caused by a single rotating direction is avoided, and the transmission mechanism has the advantage of high reliability.

Specifically, as shown in fig. 8, when the first incomplete gear 1 is driven by the motor M to perform switching-on rotation, the first incomplete gear 1 is meshed with the second incomplete gear 2 to drive the second incomplete gear 2 to perform switching-on rotation, the return spring 4 stores energy, after the circuit breaker is switched on in place, the first incomplete gear 1 is separated from the second incomplete gear 2, and the return spring 4 releases energy to enable the second incomplete gear 2 to rotate to an initial position; when the first incomplete gear 1 is driven by the motor M to perform opening rotation, the first incomplete gear 1 pushes the second incomplete gear 2 to perform opening rotation, the reset spring 4 stores energy, after the circuit breaker is opened in place, the reset spring 4 releases energy to enable the second incomplete gear 2 to rotate to the initial position, and the opening rotation direction and the closing rotation direction of the second incomplete gear 2 are opposite.

As shown in fig. 9, the lever 3 and the second incomplete gear 2 are coaxially assembled and in driving fit, the lever 3 and the second incomplete gear 2 may be stacked or staggered, but when the staggered arrangement is adopted, enough space needs to be reserved for the lever 3 to swing for the second incomplete gear 2. The second incomplete gear 2 is provided with a closing part 221 and a separating part 222, the lever 3 is provided with a first stopping part 31 and a second stopping part 32, the closing part 221 cooperates with the first stopping part 31 to drive the lever 3 to perform closing rotation, the separating part 222 cooperates with the second stopping part 32 to drive the lever 3 to perform separating rotation, wherein the closing part 221 and the first stopping part 31, and the separating part 222 and the second stopping part 32 can be of two mutually matched boss structures or of mutually matched boss and groove structures.

Reset spring 4 is by the spacing portion 26 of moving and quiet spacing portion 61 of mutually supporting carry out energy storage and energy release, move spacing portion 26 and set up on incomplete gear 2 of second, set up quiet spacing portion 61 at the 6 inner walls of the shell of incomplete gear 2 one side of second, move spacing portion 26 and carry out the circumference along incomplete gear 2 of second and rotate in one side of quiet spacing portion 61, reset spring 4 includes the spring body and extends first elastic arm 41, the second elastic arm 42 that forms by the both ends extension of the spring body, the spring body and the coaxial rotation assembly of incomplete gear 2 of second, first elastic arm 41, second elastic arm 42 set up and extend to the both sides of quiet spacing portion 61 along the both sides that move spacing portion 26 respectively.

As shown in fig. 5, in the initial position, the movable stopper portion 26 faces the static stopper portion 61, and at this time, the first elastic arm 41 is attached to one side of the movable stopper portion 26 and the static stopper portion 61, and the second elastic arm 42 is attached to the other side of the movable stopper portion 26 and the static stopper portion 61, as shown in fig. 6, when the second incomplete gear 2 performs closing rotation, the movable limiting part 26 pushes the first elastic arm 41 to separate from the static limiting part 61, the movable limiting part 26 is dislocated with the static limiting part 61, the second elastic arm 42 is limited by the static limiting part 61, so that the distance between the first elastic arm 41 and the second elastic arm 42 is enlarged, and the return spring 4 stores energy, after the circuit breaker is switched on in place, the first incomplete gear 1 and the second incomplete gear 2 are not in gear connection, and the first elastic arm 41 pushes the limiting part 26 reversely, so that the second incomplete gear 2, the movable limiting part 26 and the first elastic arm 41 are restored to the initial positions; similarly, as shown in fig. 7, when the second incomplete gear 2 performs opening rotation, the movable limiting portion 26 pushes the second elastic arm 42 to separate from the static limiting portion 61, the movable limiting portion 26 is dislocated from the static limiting portion 61, the first elastic arm 41 is limited by the static limiting portion 61, so that the distance between the first elastic arm 41 and the second elastic arm 42 is increased, and thus the return spring 4 stores energy, after the circuit breaker is opened in place, the first incomplete gear 1 and the second incomplete gear 2 are not in gear engagement, and the second elastic arm 42 reversely pushes the limiting portion 26, so that the second incomplete gear 2, the movable limiting portion 26 and the second elastic arm 42 are restored to the initial positions.

Another improvement point of this application lies in, control circuit is including parallelly connected combined floodgate circuit, separating brake circuit and auxiliary line, the break-make of combined floodgate circuit, separating brake circuit and auxiliary line is controlled by second micro-gap switch K2, third micro-gap switch K3 and first micro-gap switch K1 respectively, the combined floodgate voltage is applyed to combined floodgate circuit or separating brake circuit after the guide to switching on, make motor M drive mechanism carry out combined floodgate rotation or separating brake rotation, it switches on auxiliary circuit to trigger first micro-gap switch K1 among the rotation process of combining and separating brake to carry out at drive mechanism, when the circuit breaker targets in place and separating brake targets in place, drive mechanism is through triggering second micro-gap switch K2 simultaneously, third micro-gap switch K3 realizes the control to combined floodgate circuit and separating brake circuit, after drive mechanism combined and separating brake targets in place, trigger first micro-gap switch K1 by drive mechanism and make auxiliary line disconnection. The position of the transmission mechanism can be fed back by the matching of the transmission mechanism and the control loop, and meanwhile, the motor M can be accurately controlled.

Specifically, as shown in fig. 1-4 and 12-15, a first incomplete gear 1 of the transmission mechanism is matched with a first microswitch K1, a lever 3 of the transmission mechanism is matched with a second microswitch K2 and a third microswitch K3, the control loop comprises a closing line, a separating line and an auxiliary line which are connected in parallel, a closing voltage and a separating voltage are applied to the closed line or the separating line after being switched on, so that a motor M drives the transmission mechanism to perform closing rotation or separating rotation, the closing line and the separating line are controlled by a group of linked normally closed contacts and normally open contacts, the normally open contacts and the normally closed contacts are respectively controlled by the second microswitch K2 and the third microswitch K3, when the circuit breaker is switched in place and the separating is in place, the lever 3 simultaneously triggers the second microswitch K2 and the third microswitch K3 to realize switching of the closed line or the separating line, namely, the second microswitch K2 and the third microswitch K3 are realized by one integrated microswitch, synchronous linkage is realized, and two independent microswitches can be arranged according to the requirement; the on-off of the auxiliary circuit is controlled by a first microswitch K1, in the process of opening and closing rotation of the transmission mechanism, the first incomplete gear 1 is matched with the first microswitch K1 to enable the auxiliary circuit to be conducted, and when the transmission mechanism is in place for closing and opening, the first incomplete gear 1 triggers the first microswitch K1 to enable the auxiliary circuit to be disconnected.

So, switching on of combined floodgate circuit and separating brake circuit is switched over by lever 3 when the circuit breaker separating brake targets in place or closing brake targets in place, can guarantee that the circuit switching can not advance or lag, in addition, carry out the divide-shut brake pivoted in-process at motor M, auxiliary line is switched on in the control of first incomplete gear 1, can ensure that lever 3 breaks off the auxiliary line again after the complete separating brake of circuit breaker or closing brake targets in place, continue driving motor by the auxiliary line, control circuit is simple, and can open and stop and divide-shut brake rotation to motor M and carry out accurate and efficient control.

Furthermore, unidirectional conducting elements are respectively connected in series in the switching-on line and the switching-off line, the current conducting directions of the unidirectional conducting elements in the switching-off line and the switching-on line are opposite, when the switching-on line is switched on, switching-on voltage is applied to the switching-on line to drive the motor M to perform switching-on rotation, when the switching-off line is switched on, switching-off voltage with the polarity opposite to the switching-on voltage is applied to the switching-off line to drive the motor M to perform switching-off rotation, when the switching-on line and the switching-off line are switched on, due to the unidirectional conducting elements, the switching-off voltage cannot flow through the switching-on line, the switching-on voltage cannot flow through the switching-off line, and the motor M is prevented from being triggered by mistake. Wherein, the one-way conduction element is a diode. In addition, after the conducting state of the closing line and the opening line is switched, if the motor M still needs to continue closing rotation or opening rotation, the motor M is driven by the auxiliary line still in the conducting state to continue rotating, that is, in the closing process, when the closing line is disconnected and the opening line is closed, and at the moment, the motor M still needs to perform closing rotation, the conducting auxiliary line continues to provide closing voltage for the motor M; in the process of switching off, when the switching-off line is disconnected and the switching-on line is conducted, and at the moment, the motor M still needs to perform switching-off rotation, the conducted auxiliary line continuously provides switching-off voltage for the motor M.

Preferably, the first microswitch K1 is fixedly arranged on one side of the first incomplete gear 1, the second microswitch K2 and the third microswitch K3 are fixedly arranged between the lever 3 and the operating mechanism 5, and the second microswitch K2 is in linkage connection with the button of the third microswitch K3, so that when the circuit breaker is switched on or switched off in place, the button of one microswitch triggered by the lever 3 can realize the switching on and off of a switching-on circuit and a switching-off circuit, and the malfunction is avoided.

In connection with fig. 1-15, a preferred embodiment of a transmission mechanism, a control circuit and an operating mechanism 5 is provided, which is used for a plug-in circuit breaker, and a button mechanism of the plug-in circuit breaker is connected with a lever 3 through a U-shaped rod for realizing manual switching on and off, in this embodiment, the transmission mechanism includes a first incomplete gear 1, a second incomplete gear 2, a lever 3 and a return spring 4, and of course, in practical use, the transmission mechanism may also be provided with at least one or more transmission gears.

As shown in fig. 8, the first incomplete gear 1 includes a circular gear and a first sector gear 11, the circular gear is used for meshing with a gear or a gear set connected with an output shaft of the motor M, the first sector gear 11 is coaxially and fixedly connected with the circular gear, and the radius of the first sector gear 11 of the embodiment is smaller than that of the circular gear.

As shown in fig. 5-10, the second incomplete gear 2 includes a circular web 21 having a shaft hole at the center, the circular web 21 has a certain thickness, a second sector gear 23 is provided along one side circumferential sidewall of the circular web 21, the second sector gear 23 can be engaged with the first sector gear 11, and at the same time, the tail end 112 of the first sector gear 11 can push the head end 111 of the first sector gear 11; a fan-shaped notch 22 is formed in the other side circumferential side wall of the circular web 21, the two end faces of the fan-shaped notch 22, which are opposite, are respectively used as a closing part 221 and an opening part 222, the opening part 222 is the left end face of the notch 22 in the figure, the closing part 221 is the right end face of the notch 22, the stopping bosses 33 of the lever 3, which are coaxially connected with the circular web 21 and are arranged in staggered layers, can extend into the fan-shaped notch 22, the two side walls of the stopping bosses 33 are respectively used as a first stopping part 31 and a second stopping part 32, and the first stopping part 31 and the second stopping part 32 are respectively opposite to the closing part 221 and the opening part 222.

As shown in fig. 10, an accommodating groove 24 and a fan-shaped groove 25 are provided on one side of the circular web 21, wherein the accommodating groove 24 and the bottom of the fan-shaped groove 25 are on the same plane, the accommodating groove 24 is located at the center of the circular web 21 for assembling the return spring 4, the fan-shaped groove 25 is located between the head 231 of the second fan-shaped gear part 23 and the opening part 222, the fan-shaped groove 25 makes the circular web 21 one side thinner and one side thicker, the thicker side is located between the tail end 232 and the closing part 221 of the second fan-shaped gear part 23, the thinner side is located between the head 231 and the opening part 222 of the second fan-shaped gear part 23, a fan-shaped protrusion as a dynamic stopper 26 is provided in the middle of the fan-shaped groove 25 in a protruding manner, the dynamic stopper 26 divides the fan-shaped groove 25 into two parts, a static stopper 61 is provided on one side of the outer shell 6, as shown in fig. 5-7, the static limiting part 61 is a fan-shaped boss, the static limiting part 61 and the dynamic limiting part 26 are concentric and the central angles of the static limiting part 61 and the dynamic limiting part 26 are equal, when the second incomplete gear 2 is at the initial position, the dynamic limiting part 26 is opposite to the static limiting part 61, the dynamic limiting part 26 rotates to the two sides of the static limiting part 61 in the switching-on motion or switching-off motion process, the dynamic limiting part 26 and the static limiting part 61 are opposite in dislocation, preferably, a gap is reserved between the static limiting part 61 and the second incomplete gear 2, and the static limiting part 61 can not interfere the rotation of the second incomplete gear 2.

As shown in fig. 9 and 11, the lever 3 includes a fan-shaped lever body, one end of the lever body is provided with a shaft hole, the lever body is coaxially assembled with the second incomplete gear 2 through the shaft hole, the other end of the lever body is provided with a connecting hole 34, one side of the connecting hole 34 is provided with a stopping boss 33 protruding out of the lever body, the stopping boss 33 in fig. 9 and 11 protrudes in a direction perpendicular to the rotation axis of the lever body, so that the stopping boss 33 can extend into the notch 22 of the second incomplete gear 2, the stopping boss 33 is far smaller than the notch 22, so that the stopping boss 33 can swing in the notch 22, wherein one side wall of the stopping boss 33 facing the connecting hole 34 is a first stopping portion 31, the first stopping portion 31 is opposite to the closing portion 221, and one side wall of the stopping boss 33 facing away from the connecting hole 34 is a second stopping portion 32, the second blocking portion 32 is opposite to the opening portion 222.

As shown in fig. 5 to 7, the return spring 4 is preferably a torsion spring, the return spring 4 includes a spring body, and a first elastic arm 41 and a second elastic arm 42 formed by extending two ends of the spring body, the spring body is assembled in the accommodating groove 24 of the second incomplete gear 2 and coaxially connected with the second incomplete gear 2, preferably, the outer side wall of the spring body is respectively attached to the inner side wall of the accommodating groove 24 and the inner side wall of the movable limiting portion 26, the first elastic arm 41 and the second elastic arm 42 are respectively disposed along two sides of the movable limiting portion 26 and extend to two sides of the static limiting portion 61, the first elastic arm 41 of the return spring 4 swings between the movable limiting portion 26 and the head end 231 of the second sector gear portion 23, and the second elastic arm 42 of the return spring 4 swings between the movable limiting portion 26 and the tail end 232 of the second sector gear portion 23.

As shown in fig. 3 and 4, the operating mechanism 5 includes a rotating plate 51 rotatably mounted in the housing 6, a jump buckle 52 and a lock buckle 53 are rotatably disposed on the rotating plate 51, the jump buckle 52 is in snap-fit with one end of the lock buckle 53, one end of the jump buckle 52 is connected with a link 54 in linkage connection with the lever 3, one end of the link 54 is inserted into the connecting hole 34 of the lever 3, and the other end is inserted into the jump buckle 52. The rotating plate 51 is connected with the moving contact, the rotating plate 51 is driven to rotate by the rotation of the lever 3 through the connecting rod 54 and the trip buckle 52, the moving contact and the static contact are driven to be matched to realize switching on and off, and when overload or short-circuit faults occur, the overload protection mechanism or the short-circuit protection mechanism drives the buckle 53 to remove the hasp matching of the trip buckle 52 and the buckle 53, so that the operating mechanism 5 is tripped, and the protection function of the circuit breaker is realized.

As shown in fig. 12 to 15, the control circuit includes a closing line, an opening line and an auxiliary line, the closing line includes a second micro switch K2 and a diode D2, the opening line includes a third micro switch K3 and a diode D3, the auxiliary line includes a first micro switch K1, a first end of the first micro switch K1 is connected to an anode of the diode D2 and a cathode of the diode D3, second ends of the first micro switch K1, the second micro switch K2 and the third micro switch K3 are connected together and connected in series with the motor M, a first end of the second micro switch K2 is connected to a cathode of the diode D2, and a first end of the third micro switch K3 is connected to an anode of the diode D3.

As shown in fig. 3 and 4, the first microswitch K1 is fixedly arranged at one side of the first incomplete gear 1, and the button of the first microswitch K1 is positioned at one side provided with the first sector gear 11, so that the head end 111 and the tail end 112 of the first sector gear 11 can abut against each other to trigger the first microswitch K1, and of course, a corresponding boss can be arranged on the first sector gear 11 to trigger the first microswitch K1; the second microswitch K2 and the third microswitch K3 are fixedly arranged between the lever 3 and the operating mechanism 5, specifically arranged at one side of the lever 3, preferably at one side of the lever body close to the connecting hole 34, the second microswitch K2 is linked with the button of the third microswitch K3, and the second microswitch K2 and the third microswitch K3 are kept in a state of being disconnected and closed. When the circuit breaker is switched on in place, as shown in fig. 3, the side wall of the lever body triggers the second microswitch K2 and the third microswitch K3 at the same time, when the circuit breaker is switched off in place or before the circuit breaker is switched off in place, the end part of one end of the lever body leaves the second microswitch K2 and the third microswitch K3 at the same time, and in fig. 4, the end of the lever body provided with the shaft hole leaves the second microswitch K2 and the third microswitch K3. Certainly, when the breaker is in place, the side wall of the lever body triggers the second microswitch K2 and the third microswitch K3 at the same time, and when the breaker is in place or before the breaker is in place, the end part of one end of the lever body can leave the second microswitch K2 and the third microswitch K3 at the same time.

In this embodiment, the in-place closing of the circuit breaker means that the lever 3 is driven to a closing position, the lever 3 drives the operating mechanism 5 to complete a closing action, and the in-place closing of the transmission mechanism means that after the first incomplete gear 1 is separated from the second incomplete gear 2, the second incomplete gear 2 is reset, and the first incomplete gear 1 rotates to the closing position; the breaker is in place, namely the lever is driven to the opening position, the lever 3 drives the operating mechanism 5 to complete the opening action, and the transmission mechanism is in place, namely after the first incomplete gear 1 is separated from the second incomplete gear 2, the second incomplete gear 2 resets and the first incomplete gear 1 rotates to the opening position, so that the transmission mechanism still needs to rotate for a period of time to meet the opening position or to open the opening position when the breaker is in place for opening or closing.

The specific working process is as follows:

take the example that the second microswitch K2 is arranged at the switching-on position of the lever 3, and the second microswitch K2 is linked with the button of the third microswitch K3, wherein the second microswitch K2 controls the normally closed contact, and the third microswitch K3 controls the normally open contact.

The process from the opening in place to the closing in place of the transmission mechanism comprises the following steps: when the switching-off state is achieved (the transmission mechanism and the circuit breaker are both in the switching-off state), the tail end 112 of the first sector gear part 11 abuts against the button of the first microswitch K1 to make the auxiliary circuit in the off state, the end of the lever 3 is not pressed on the buttons of the second microswitch K2 and the third microswitch K3 to make the switching-on circuit conducted, the switching-off circuit is disconnected, and at this time, the switching-on voltage is applied to the control circuit, current flows through the switching-on circuit, the current direction is from left to right in fig. 12 and 13, the motor M performs the switching-on rotation, the transmission mechanism connected with the motor M also performs the switching-on rotation, as shown in fig. 4, the tail end 112 of the first sector gear part 11 is separated from the button of the first microswitch K1 to make the auxiliary circuit conducted (see fig. 13), the head end 111 of the first sector gear part 11 is engaged with the head end 231 of the second sector gear part 23 located at the initial position, to drive the second incomplete gear 2 to perform closing rotation, when the second incomplete gear 2 performs closing rotation, the closing part 221 pushes the first blocking part 31 to make the lever 3 perform closing rotation until the lever 3 drives the operating mechanism 5 through the connecting rod 54 to complete closing action (at this time, the circuit breaker has completed the action process from opening to closing), and at the same time, as shown in fig. 6, the movable limiting part 26 rotating together with the second incomplete gear 2 pushes the first elastic arm 41 of the return spring 4 to gradually increase the distance between the first elastic arm 41 and the second elastic arm 42 to store energy; after the first sector gear part 11 is separated from the tail end 232 of the second sector gear part 23, the reset spring 4 releases the energy to enable the first elastic arm 41 to reversely push the limiting part 26 to drive the second incomplete gear 2 to rotate back to the initial position, in the process that the second incomplete gear 2 rotates back to the initial position, the lever 3 which is already at the switching-on position is not pushed, but the switching-off part 222 of the second incomplete gear 2 is close to or attached to the second stopping part 32 of the lever 3, meanwhile, the lever 3 which is at the switching-on position simultaneously triggers the second microswitch K2 and the third microswitch K3, so that the conduction states of the switching-on circuit and the switching-off circuit are switched, namely, the switching-on circuit is switched off, when the lever 3 just touches the second microswitch K2, and at the stroke error of the microswitch and the switching-on, the lever 3 can trigger the second microswitch K2 in advance before being in place, however, at this time, the first incomplete gear 1 or the lever 3 cannot be ensured at the switching-on position, and therefore, it is necessary to keep the motor M rotating for a while through the auxiliary line, but because the switching-on voltage cannot flow through the switching-off line due to the unidirectional conduction of the diode D3, at this time, if the first incomplete gear 1 separated from the second incomplete gear 2 does not rotate to the switching-on position, at this time, the switching-on voltage may drive the motor M to rotate continuously through the auxiliary line still in the conducting state until the first incomplete gear 1 rotates to the switching-on position, so that the head end 111 of the first sector gear 11 abuts against the button of the first microswitch K1 to disconnect the auxiliary line, the motor M is stopped due to the loss of power, and at this time, the transmission mechanism is switched on in place (see fig. 3 and 14).

The process from the closing in place to the opening in place of the transmission mechanism is as follows: when the circuit breaker is in a closed state (the transmission mechanism and the circuit breaker are both in a closed state), the head end 111 of the first fan-shaped gear part 11 abuts against the button of the first microswitch K1 to make the auxiliary circuit in a disconnected state, the side wall of the lever 3 presses the buttons of the second microswitch K2 and the third microswitch K3 to make the opening circuit and the closing circuit in a disconnected state, the opening voltage with the polarity opposite to the closing voltage is applied to the control loop, the current flows through the opening circuit, the current direction is from right to left in fig. 14 and 15, the motor M performs opening rotation, the transmission mechanism connected with the motor M also performs opening rotation, along with the opening rotation of the first incomplete gear 1, the head end 111 of the first fan-shaped gear part 11 is separated from the button of the first microswitch K1 to make the auxiliary circuit in a connected state (see fig. 15), the tail end 112 of the first fan-shaped gear part 11 pushes the head end 231 of the second fan-shaped gear part 23 located at the initial position to perform opening rotation, so that the opening part 222 of the second incomplete gear 2 pushes the second blocking part 32 to make the lever 3 perform opening rotation, during the opening rotation of the lever 3, the lever 3 is separated from the buttons of the second microswitch K2 and the third microswitch K3, at this time, the opening line is conducted, the closing line is disconnected, however, the switching-off voltage cannot flow through the switching-on line due to the unidirectional conduction of the diode D2, the switching-off voltage drives the motor M to continue switching-off rotation only through the conducted auxiliary line, so that the lever 3 can continue to perform opening rotation until the lever 3 drives the operating mechanism 5 to complete opening (at the moment, the circuit breaker completes the action process from closing in place to opening in place), meanwhile, as shown in fig. 7, the movement limiting portion 26 rotating together with the second incomplete gear 2 pushes the second elastic arm 42 of the return spring 4, so that the distance between the first elastic arm 41 and the second elastic arm 42 is gradually increased to store energy; after the tail end 112 of the first sector gear part 11 is separated from the head end 231 of the second sector gear part 23, the return spring 4 releases the energy to make the second elastic arm 42 reversely push the motion-limiting part 26 to drive the second incomplete gear 2 to rotate back to the initial position, and in the process that the second incomplete gear 2 rotates back to the initial position, the lever 3 which is already at the opening position is not pushed, but the closing part 221 of the second incomplete gear 2 is close to or attached to the first stopping part 31 of the lever 3, and at the same time, after the opening rotation of the motor M drives the first incomplete gear 1 to be separated from the second incomplete gear 2, the tail end 112 of the first sector gear part 11 is abutted against the button of the first microswitch K1 to disconnect the auxiliary circuit, the motor M is stopped due to power loss, and the transmission mechanism is opened to the right position (see fig. 4 and 12). In the process, the conduction time of the switching-off line is obviously shorter than that of the switching-on line.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims (10)

1. A circuit breaker comprises an operating mechanism (5) and a driving module, wherein the driving module is matched with the operating mechanism (5) to realize automatic opening and closing of the circuit breaker, the driving module comprises a control circuit, a motor (M) connected with the control circuit and a transmission mechanism driven by the motor (M),

the control circuit comprises a closing line and an opening line which are connected in parallel, the closing line and the opening line are kept in one conduction and one disconnection, unidirectional conduction elements are respectively connected in the closing line and the opening line in series, the current conduction directions of the unidirectional conduction elements of the opening line and the closing line are opposite, when the closing line is conducted, closing voltage is applied to the closing line to drive a motor (M) to carry out closing rotation, when the opening line is conducted, opening voltage with the polarity opposite to the closing voltage is applied to the opening line to drive the motor (M) to carry out opening rotation, and the control circuit is characterized in that:

the control circuit further comprises an auxiliary circuit connected with the closing circuit and the opening circuit in parallel, the on-off of the auxiliary circuit is controlled by a first microswitch (K1), the transmission mechanism triggers the first microswitch (K1) to conduct the auxiliary circuit when opening and closing rotation is carried out on the circuit breaker, when the circuit breaker is closed in place and opened in place, the transmission mechanism triggers the conducting state switching of the closing circuit and the opening circuit firstly, the auxiliary circuit in the conducting state drives a motor (M) to continue to rotate, and the first microswitch (K1) is triggered to disconnect the auxiliary circuit when the transmission mechanism is closed in place or opened in place.

2. A circuit breaker according to claim 1, wherein: the on-off of the switching-off line and the switching-on line are respectively controlled by a second microswitch (K2) and a third microswitch (K3), and when the circuit breaker is switched on or switched off in place, a transmission mechanism simultaneously triggers the second microswitch (K2) and the third microswitch (K3) to control the on-off of the switching-on line and the switching-off line.

3. A circuit breaker according to claim 2, wherein: the switching-on circuit and the switching-off circuit are controlled by a group of normally closed contacts and a group of normally open contacts, the on-off of the normally closed contacts and the on-off of the normally closed contacts are controlled by a second micro switch (K2) and a third micro switch (K3) respectively, and the transmission mechanism enables the switching-on circuit and the switching-off circuit to be kept in one on-off state by triggering the second micro switch (K2) and the third micro switch (K3).

4. A circuit breaker according to claim 3, wherein: the second microswitch (K2) is in linkage connection with a button of the third microswitch (K3), and when the breaker is switched on in place, the transmission mechanism triggers the second microswitch (K2) and the third microswitch (K3) to switch the conduction states of a switching-on line and a switching-off line.

5. A circuit breaker according to claim 4, wherein: when the breaker is in place from the opening to the closing, the conducting closing line and the auxiliary line drive motor (M) carry out closing rotation, when the breaker is in place from the closing to the opening, the conducting opening line drive motor (M) carries out opening rotation, and then the conducting auxiliary line drive motor (M) continues opening rotation.

6. A circuit breaker according to claim 2, wherein: drive mechanism is including first incomplete gear (1), lever (3) with motor (M), operating device (5) linkage respectively, and first incomplete gear (1) is used for triggering first micro-gap switch (K1), and lever (3) are used for triggering second micro-gap switch (K2) and third micro-gap switch (K3), first micro-gap switch (K1) is fixed to be set up in one side of first incomplete gear (1), and second micro-gap switch (K2) and third micro-gap switch (K3) are fixed to be set up between lever (3) and operating device (5).

7. The circuit breaker of claim 6, wherein: first incomplete gear (1) includes first fan-shaped gear portion (11), and when drive mechanism closed a floodgate and put in place, head end (111) of first fan-shaped gear portion (11) supported with the button of first micro-gap switch (K1) and leaned on, put in place at drive mechanism separating brake back, and tail end (112) of first fan-shaped gear portion (11) supported with the button of first micro-gap switch (K1) and leaned on, and at the divide-shut brake rotation in-process, first fan-shaped gear portion (11) and the button separation of first micro-gap switch (K1).

8. A circuit breaker according to claim 6, wherein: lever (3) are including sectorial lever body the one end of lever body is equipped with the shaft hole the other end of lever body is equipped with connecting hole (34), connecting hole (34) are used for being connected with connecting rod (54) linkage of operating device (5), and second micro-gap switch (K2) and third micro-gap switch (K3) set up lever body one side near connecting hole (34), when the circuit breaker is switched on or the separating brake targets in place, trigger second micro-gap switch (K2) and third micro-gap switch (K3) simultaneously by the lateral wall of lever body, when the circuit breaker is switched on or is switched on and targets in place, second micro-gap switch (K2) and third micro-gap switch (K3) are left to the one end tip of lever body.

9. A circuit breaker according to claim 6, wherein: the transmission mechanism further comprises a second incomplete gear (2), the second incomplete gear (2) is coaxially and rotatably assembled with the lever (3) in a driving fit mode, the second incomplete gear (2) is matched with the first incomplete gear (1), and the first incomplete gear (1) drives the second incomplete gear (2) to perform opening and closing rotation; in the switching-on and switching-off process, the first incomplete gear (1) is matched with the second incomplete gear (2) located at the initial position, so that the second incomplete gear (2) drives the lever (3) to perform switching-off rotation or switching-on rotation, and the directions of the switching-off rotation and the switching-on rotation are opposite.

10. The circuit breaker of claim 6, wherein: operating device (5) are including rotating assembly rotating plate (51) in shell (6) it is provided with jump knot (52) and hasp (53) to rotate on rotating plate (51), jump knot (52) and the one end hasp cooperation of hasp (53), the one end of jumping knot (52) is connected with connecting rod (54), connecting rod (54) are used for being connected with drive mechanism's lever (3) linkage.

Images