CN218513401U - Circuit breaker - Google Patents

Abstract

The embodiment of the application provides a circuit breaker, and relates to the technical field of circuit breakers. The circuit breaker can realize arc-free opening and has high use safety. The circuit breaker comprises a switching device, a lock catch, a moving contact, a fixed contact and an electromagnetic tripping mechanism; the switching device, the moving contact and the static contact are connected in series in a main loop of the circuit breaker; the lock catch is movably arranged in a shell of the circuit breaker, is used for limiting the moving contact, and is provided with a locking position for keeping the moving contact and the static contact in a contact state and an unlocking position for releasing the limit of the moving contact to allow the moving contact and the static contact to be separated; the action end of the electromagnetic tripping mechanism faces the lock catch and is used for pushing the lock catch when power is supplied, so that the lock catch moves from the locking position to the unlocking position; the electromagnetic tripping mechanism of the switching device is respectively and electrically connected with the control module of the circuit breaker, and the control module is used for controlling the switching device to be switched on or switched off and controlling the electromagnetic tripping mechanism to be powered on after the switching device is switched off or when the switching device is switched off.

Description

Circuit breaker

Technical Field

The embodiment of the application relates to the technical field of circuit breakers, in particular to a circuit breaker.

Background

The circuit breaker is an electrical protection component and is used for conducting a circuit during normal work and quickly cutting off the circuit when abnormality occurs.

The circuit breaker comprises a moving contact and a fixed contact, and when the moving contact is contacted with the fixed contact, a circuit can be conducted, so that the circuit breaker is in a closing state; when the moving contact is separated from the static contact, the circuit can be cut off, so that the circuit breaker is in an opening state.

However, the circuit breaker in the prior art is easy to generate electric arcs when the moving contact and the fixed contact are separated. The arc not only easily burns other components within the circuit breaker, but also easily causes safety problems, and therefore, reducing or suppressing the arc generation can improve the safety of use of the circuit breaker.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the embodiment of the application provides a circuit breaker, and this circuit breaker can realize no arc separating brake, and the safety in utilization is high.

The application provides a circuit breaker, which comprises a switching device, a lock catch, a moving contact, a static contact and an electromagnetic tripping mechanism; the switching device, the moving contact and the static contact are connected in series in a main loop of the circuit breaker; the lock catch is movably arranged in a shell of the circuit breaker, is used for limiting the moving contact, and is provided with a locking position for keeping the moving contact and the static contact in a contact state and an unlocking position for releasing the limit of the moving contact to allow the moving contact and the static contact to be separated; the action end of the electromagnetic tripping mechanism faces the lock catch and is used for pushing the lock catch when power is supplied, so that the lock catch moves from the locking position to the unlocking position; the switch device and the electromagnetic tripping mechanism are respectively and electrically connected with a control module of the circuit breaker, and the control module is used for controlling the switch device to be switched on or switched off and controlling the electromagnetic tripping mechanism to be powered on after the switch device is switched off or when the switch device is switched off.

Therefore, under the condition of adopting the technical scheme, the switching device is connected in series in the main circuit of the circuit breaker, so that the on-off of the main circuit can be controlled through the on-off of the switching device. The control module is used for controlling the switch device to be disconnected and controlling the electromagnetic tripping mechanism to be electrified after or when the switch device is disconnected, and the principle that the switch device needs less time for disconnection and the electromagnetic tripping mechanism needs long time for action is utilized, so that the main loop is disconnected through the switch device before the movable contact is released from limit by the latch, and electric arc can not be generated when the movable contact is separated from the static contact, therefore, the purpose of arc-free opening of the circuit breaker can be achieved, and the use safety of the circuit breaker is improved.

In one possible implementation, the latch may be rotatably connected to the housing, and the circuit breaker further includes a first elastic member for applying an elastic force to the latch capable of driving the latch to move from the unlocking position to the locking position.

Under the condition of adopting the technical scheme, after the electromagnetic tripping is powered off, the lock catch automatically moves towards the locking position under the action of the first elastic piece, and when the moving contact reaches the position capable of being matched with the lock catch, the moving contact automatically reaches the locking position under the action of the first elastic piece, so that the moving contact is quickly locked.

In a possible embodiment, the latch includes a first mating portion, a second mating portion is disposed on the moving contact, and when the circuit breaker is switched on, the second mating portion moves along a rotation path of the first mating portion along with the moving contact, the latch rotates to a locking position under the driving of the first elastic element, and the first mating portion and the second mating portion cooperate with each other in the locking position to lock the moving contact.

Under the condition of adopting the technical scheme, the movable contact can be reliably limited through the corresponding matching of the first matching part and the second matching part.

In a possible embodiment, the first mating portion is configured as a locking projection and the second mating portion is configured as a locking recess, in which the locking projection is inserted in the locking position.

Adopt under the condition of above-mentioned technical scheme, the locking is protruding to be spacing each other with the locking recess to support reliably and press the moving contact on the stationary contact.

In a possible implementation manner, the latch further includes a pushing portion, and the actuating end of the electromagnetic trip mechanism faces the pushing portion, so that the latch rotates to the unlocking position against the acting force of the first elastic member by pushing the pushing portion.

Under the condition of adopting the technical scheme, the action ends of the first elastic piece and the electromagnetic tripping mechanism apply opposite action forces to the lock catch, so that the lock catch can be switched between a locking position and an unlocking position, and the locking and unlocking functions of the movable contact are realized.

In a possible implementation manner, the circuit breaker further comprises a feedback circuit board and a feedback switch, wherein the feedback switch is connected in series in a feedback circuit of the feedback circuit board and is used for disconnecting or connecting the feedback circuit; the lock catch further comprises a feedback end, the feedback end abuts against the feedback switch at the locking position or the unlocking position so that the feedback switch has different opening and closing states at the locking position and the unlocking position, and the control module is electrically connected with the feedback circuit and used for controlling the electromagnetic tripping mechanism to lose power when the lock catch is at the unlocking position according to whether the feedback circuit is conducted or not.

Under the condition of adopting the technical scheme, the feedback circuit board is used for feeding back the on-off state of the feedback circuit to the control module of the circuit breaker, and the on-off state of the feedback circuit is related to the on-off state of the feedback switch, so that the signal fed back to the control module by the feedback circuit board represents the position of the lock catch. The control module judges whether the lock catch is located at the unlocking position by detecting whether the feedback circuit is conducted according to the corresponding relation between the position of the lock catch and the opening and closing state of the feedback switch, when the lock catch is judged to be located at the unlocking position, the task of enabling the electromagnetic tripping mechanism to be electrified to drive the lock catch to be unlocked is completed, the control module can timely control the electromagnetic tripping mechanism to be powered off, the pushing force of the action end to the lock catch is cancelled, and the energy consumption of the electromagnetic tripping mechanism is reduced.

In one possible embodiment, the feedback switch may be a normally closed switch, and the feedback switch is in a closed state when the latch moves to the unlocking position; when the lock catch moves to the locking position, the feedback end pushes the feedback switch to be disconnected.

In one example, the normally closed switch comprises a torsion spring, a first probe, a second probe and a fixed column, wherein the first probe, the second probe and the fixed column are mounted on the feedback circuit board; when the lock catch moves to the locking position, the feedback end pushes the second pin to be far away from the second probe, the feedback switch is disconnected, and when the lock catch moves to the unlocking position, the second pin is in abutting contact with the second probe, and the feedback switch is closed.

Through the technical scheme, the normally closed switch is closed only when the lock catch moves to the unlocking position, so that the energy consumption of a feedback circuit is reduced, and the lock catch can be accurately fed back to reach the unlocking position; in addition, the second pin and the electromagnetic tripping mechanism jointly push the lock catch to move towards the unlocking position, and the reduction of the energy consumption of the electromagnetic tripping mechanism is facilitated.

In one possible embodiment, the circuit breaker may be a plug-in circuit breaker. The plug-in circuit breaker has the advantages of arc-free opening, energy conservation and good safety performance.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and the embodiments of the present application can be implemented according to the content of the description in order to make the technical means of the embodiments of the present application more clearly understood, and the detailed description of the present application is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic diagram of an internal circuit breaker in a closing state according to an embodiment of the present disclosure.

Fig. 2 is an internal schematic view of the latch provided in the unlocked position, based on fig. 1.

Fig. 3 is an internal schematic diagram of the circuit breaker in an open state based on fig. 1.

Fig. 4 is an enlarged view of a portion a in fig. 2.

Fig. 5 is a cross-sectional view of an electromagnetic trip mechanism of a circuit breaker according to an embodiment of the present application.

Reference numerals are as follows:

1-moving contact, 2-static contact, 3-lock catch, 31-first matching part, 32-pushing part, 33-feedback end,

4-an electromagnetic tripping mechanism, 41-a push rod, 411-an action end, 42-a movable iron core, 43-an electromagnetic coil, 44-a second elastic piece, 45-a coil rack, 46-a stop piece,

5. a first elastic reset piece is arranged on the first elastic reset piece,

6-a feedback switch, 61-a first probe, 62-a second probe, 63-a fixed column, 64-a torsion spring, 641-a first pin and 642-a second pin;

71-button, 72-opening spring; 8-feedback circuit board.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the description and claims of this application and the description of the figures are intended to cover non-exclusive inclusions.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: there are three cases of A, A and B, and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features.

In the description of the present application, unless otherwise specified, "plurality" means two or more (including two), and similarly, "plural groups" means two or more (including two).

In the description of the present application, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., "connected" or "connected" of a mechanical structure may refer to a physical connection, e.g., a physical connection may be a fixed connection, e.g., a fixed connection by a fastener, such as a screw, bolt, or other fastener; the physical connection can also be a detachable connection, such as a mutual clamping or clamping connection; the physical connection may also be an integral connection, for example, a connection made by welding, gluing or integrally forming the connection. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

The inventor finds that, through research, when a moving contact and a fixed contact of the circuit breaker are separated, an electric arc is generated between the moving contact and the fixed contact, because a main loop of the circuit breaker is in a conducting state when the circuit breaker is opened, current passes between the moving contact and the fixed contact, and when the moving contact is separated from the fixed contact, the voltage between the moving contact and the fixed contact can enable electrons in surrounding media to generate strong electricity dissociation so as to generate the electric arc.

In order to solve the above problem, referring to fig. 1 and 2, the present application provides a circuit breaker, which includes a switching device, a latch 3, a movable contact 1, a stationary contact 2, and an electromagnetic trip mechanism 4; the MOS tube, the moving contact 1 and the static contact 2 are connected in series in a main loop of the circuit breaker; the lock catch 3 is movably arranged in a shell of the circuit breaker, the lock catch 3 is used for limiting the moving contact 1, and has a locking position for keeping the moving contact 1 and the static contact 2 in a contact state and an unlocking position for releasing the limit of the moving contact 1 to allow the moving contact 1 and the static contact 2 to be separated; the action end 411 of the electromagnetic tripping mechanism 4 faces the lock catch 3 and is used for pushing the lock catch 3 when power is supplied, so that the lock catch 3 moves from the locking position to the unlocking position; the switching device and the electromagnetic tripping mechanism 4 are respectively electrically connected with a control module of the circuit breaker, and the control module is used for controlling the switching device to be switched on or switched off and controlling the electromagnetic tripping mechanism 4 to be powered on after the switching device is switched off or when the switching device is switched off.

The switch device may include a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), a diode or a Transistor.

The locking position is: the latch 3 is capable of maintaining the contact position of the moving contact 1 and the stationary contact 2. The limit of the lock catch 3 to the moving contact 1 at the locking position is as follows: the lock catch 3 applies a pushing force towards the static contact 2 to the moving contact 1 at the locking position so as to achieve the purpose of limiting the moving contact to move towards the direction far away from the static contact 2, and therefore the moving contact 1 and the static contact 2 are kept in good contact.

The unlocked position is: the action end 411 of the electromagnetic trip mechanism 4 can push the latch 3 to move to a position away from the limit of the movable contact, for example, the position can be a position where the action end 411 of the electromagnetic trip mechanism 4 can push the latch 3 to move to a position farthest from the locking position in a stroke range, or a limit column far away from the movable contact 1 can be further arranged in the circuit breaker, when the latch 3 moves to impact the limit column, the latch does not move any more, and is pushed by the electromagnetic trip mechanism 4 to keep abutting against the position of the limit column. When the latch 3 is located at the unlocking position, the limit of the moving contact 1 is released, that is, the moving contact 1 is not applied with the thrust towards the static contact 2, and the moving contact 1 is allowed to leave the static contact 2.

It is clear that in the locking position the latch 3 is in contact with the movable contact 1, while in the unlocking position the latch 3 is separated from the movable contact 1, without contact. In the process of moving from the locking position to the unlocking position, the latch 3 can be continuously contacted with the movable contact 1 for a period of time; similarly, in the process of moving from the unlocking position to the locking position, the latch 3 may contact the movable contact 1 immediately before reaching the locking position, and push the movable contact 1 toward the fixed contact 2 until the movable contact 1 contacts the fixed contact 2, and the latch 3 reaches the locking position.

As for how the moving contact 1 leaves the static contact 2 after the latch 3 is unlocked, there may be various implementation manners: for example, in an example, the movable contact 1 may be connected to a pull rod, the pull rod extends out of a housing of the circuit breaker, and after the latch 3 is unlocked, the movable contact 1 may be pulled away from the stationary contact 2 by applying a force to the pull rod. In another example, an elastic reset element may be connected to the movable contact 1, so that after the latch 3 is unlocked, the movable contact 1 automatically moves away from the fixed contact 2 under the action of the elastic reset element.

In the present application, the contact between the moving contact 1 and the stationary contact 2 may be referred to as closing, and the separation between the moving contact 1 and the stationary contact 2 may be referred to as opening. When the circuit breaker is in a closing state and the switching device is in a conducting state, the main loop of the circuit breaker has current passing, namely the main loop is conducted.

When the movable contact 1 and the fixed contact 2 need to be separated, the electromagnetic tripping mechanism 4 can be used for pushing the lock catch 3 to move from the locking position to the unlocking position. Specifically, the control module can be used for controlling the switch device to be switched off, then or simultaneously, the electromagnetic tripping mechanism 4 is powered on, a magnetic field is generated when the electromagnetic tripping mechanism 4 is powered on, and the action end 411 moves towards the lock catch 3 under the action of the magnetic field, so that the lock catch 3 can be pushed to move to the unlocking position; obviously, the disconnection of the switching device is directly controlled by a signal, so that the time required for the disconnection of the switching device is short, and the process from the power-on of the electromagnetic trip mechanism 4 to the pushing of the action end 411 against the lock catch 3 to leave the locking position is the action completed by the mechanical transmission of the signal control, and the time required for the disconnection is long, so that even if the switching device and the electromagnetic trip mechanism 4 are powered simultaneously, the switching device is disconnected before the action end 411 pushes the lock catch 3 to leave the locking position, and the main circuit is in the disconnection state through the disconnection of the switching device, namely, no current passes through the main circuit, the moving contact 1 and the static contact 2 are not electrified, and then, after the lock catch 3 leaves the locking position, when the moving contact 1 and the static contact 2 are separated, no voltage difference exists between the two, and no electric arc is generated.

Therefore, under the condition of adopting the technical scheme, the control module is used for controlling the switch device to be disconnected, and controlling the electromagnetic tripping mechanism 4 to be electrified after or when the switch device is disconnected, the time required by the switch device to be disconnected is short, and the time required by the action of the electromagnetic tripping mechanism 4 is long, so that the main loop is disconnected along with the disconnection of the switch device before the latch 3 is positioned at the unlocking position, no current passes through the main loop at the moment, and when the moving contact 1 and the static contact 2 are controlled to be separated in the brake separating process, the arc-free brake separating purpose of the circuit breaker can be achieved, and the use safety of the circuit breaker is improved.

In a possible implementation, referring to fig. 1, the latch 3 may be rotatably connected to the housing, and the circuit breaker further includes a first elastic member 5, wherein the first elastic member 5 is configured to apply an elastic force to the latch 3 capable of driving the latch 3 to move from the unlocking position to the locking position.

Obviously, the forces applied to the latch 3 by the first elastic member 5 and the electromagnetic trip mechanism 4 are opposite, and when the electromagnetic trip mechanism 4 is powered, the force of the acting end 411 moving towards the latch 3 to push against the latch 3 needs to be greater than the elastic acting force of the first elastic member 5, so that the latch 3 can be pushed from the locking position to the unlocking position. When the electromagnetic tripping mechanism 4 is de-energized, the magnetic field disappears, then the actuating end 411 does not apply a pushing force to the latch 3 any more, the latch 3 can move toward the locking position under the action of the first elastic member 5, and after reaching the locking position matched with the movable contact 1, the first elastic member 5 reliably keeps the latch 3 at the locking position, so that the movable contact 1 and the fixed contact 2 can be reliably contacted. In this way, under the action of the first elastic member 5, the latch 3 can automatically move from the unlocking position to the locking position after the electromagnetic trip mechanism 4 is de-energized. The process that the latch 4 moves from the locking position to the unlocking position under the action of the electromagnetic tripping mechanism 4 is a process that the first elastic element 5 continuously accumulates force, and in the process, the elastic force accumulated by the first elastic element 5 is continuously increased, so that the latch 4 can rapidly rotate to the locking position under the action of the first elastic element 5 after the moving contact and the static contact are switched on.

In the present application, when the latch 3 is located at the locking position, the unlocking position and between the locking position and the unlocking position, the first elastic member 5 is in a deformed state, but when the latch 3 is located at the locking position, the deformation amount of the first elastic member 5 is smaller than that of the first elastic member 5 when the latch 3 is located at the unlocking position; or when the latch 3 is located at the unlocking position and between the unlocking position and the locking position, the first elastic member 5 is in a deformed state, and when the latch 3 reaches the locking position, the first elastic member 5 recovers deformation. In both cases, when the latch 3 rotates from the locking position to the unlocking position, the first elastic member 5 is deformed to generate an elastic acting force applied to the latch 3 to prevent the latch 3 from leaving the locking position, but when the pushing force of the electromagnetic trip mechanism 4 is greater than the elastic acting force, the electromagnetic trip mechanism 4 pushes the latch 3 to move towards the unlocking position, so as to achieve the purpose of unlocking.

It should be noted here that, when the latch 3 is driven by the first elastic element 5 and moves towards the locking position, whether the latch 3 can reach the locking position, still depend on the position of the moving contact 1, when the moving contact 1 is located at the position capable of cooperating with the latch 3, the moving contact 1 can avoid the latch 3 to make it move to the locking position, otherwise, the latch 3 may be blocked by the moving contact 1 and be located between the unlocking position and the locking position, can not reach the locking position cooperating with the moving contact 1, at this moment, the latch 3 is under the effect of the first elastic element 5, can lean on the moving contact 1, but can not play the purpose of spacing moving contact 1.

Under the condition of adopting the technical scheme, after the electromagnetic tripping mechanism 4 loses power, the lock catch 3 automatically moves towards the locking position under the action of the first elastic part 5, and when the moving contact 1 reaches the position capable of being matched with the lock catch 3, the moving contact 1 automatically reaches the locking position under the action of the first elastic part 5, so that the moving contact 1 is quickly locked.

In one example, one end of the first elastic member 5 may be fixed inside the housing, and the other end abuts against the latch 3 after being connected to apply an elastic force to the latch 3 capable of driving the latch 3 to move from the unlocking position to the locking position.

For example, the first elastic element 5 may be a torsion spring 64 having two pins, one pin is connected to the inside of the housing, and the other pin is connected to the latch 3 and moves synchronously with the latch 3, or one pin is connected to the inside of the housing, and the other pin is always abutted against the latch 3 under the action of the self-deformation force of the torsion spring 64; or, the inner side of the shell is provided with an abutting column, one pin is always abutted against the abutting column under the action of the self deformation force of the torsion spring 64, and the other pin is connected with the lock catch 3; or, under the action of the self deformation force of the torsion spring 64, one pin is always abutted with the abutting column, and the other pin is always abutted with the lock catch 3; in this way, the first elastic element 5 can exert an elastic force on the catch 3 so that it always has a tendency to move towards the locking position.

In a possible embodiment, referring to fig. 1 and fig. 2, the latch 3 includes a first mating portion 31, and a second mating portion is disposed on the movable contact 1, and when the circuit breaker is closed, the second mating portion follows the rotation path of the first mating portion 31 along with the movement of the movable contact 1, and the first mating portion 31 is rotated to a locking position under the driving of the first elastic element 5, and the locking function of the movable contact 1 is realized by the cooperation between the locking position and the second mating portion.

It is clear that, the latch 3 is firstly pushed by the electromagnetic trip mechanism 4 to reach the unlocking position, after the moving contact 1 and the static contact 2 are separated, the electromagnetic trip mechanism 4 can be immediately de-energized to achieve the energy-saving effect, or when or after the second matching part is pushed to move to the rotating path of the first matching part 31, the electromagnetic trip mechanism 4 is de-energized, the latch 3 automatically moves towards the locking position under the action of the first elastic part 5, and in the moving process, the first matching part 31 and the second matching part are gradually matched in place, and along with the matching in place, the latch 3 reaches the locking position and can limit the moving contact 1.

Under the condition of adopting the technical scheme, the movable contact 1 can be reliably limited through the corresponding matching of the first matching part 31 and the second matching part.

Referring to fig. 2 and 3, the first mating portion 31 and the second mating portion can be implemented in various ways, and in one possible embodiment, the first mating portion 31 is configured as a locking protrusion, and the second mating portion is configured as a locking groove, and in the locking position, the locking protrusion is inserted into the locking groove.

Specifically, the notch of the locking groove faces the latch 3, and in the process that the latch 3 rotates towards the locking position, the locking protrusion can be inserted from the notch of the locking groove, then the latch 3 is blocked by the passive contact 1 to stop rotating and stay at the locking position, and the first elastic piece 5 forces the latch 3 to be kept at the locking position to realize a good locking function.

Alternatively, in another possible embodiment, the first mating portion 31 is configured as a locking groove and the second mating portion is configured as a locking projection, and in the locking position, the locking projection is inserted into the locking groove.

Specifically, the notch of locking recess is towards moving contact 1, and when 3 orientation locking position pivoted in-process of hasp, the locking recess can overlap outside the locking arch, also is that the locking arch inserts in the locking recess, then 3 of hasp stop rotation and stop at the locking position by passive contact 1 blocks, and first elastic component 5 forces 3 of hasp to keep in the locking position in order to realize good locking function.

Under the condition of adopting above-mentioned technical scheme, can make 4 electricity losses of electromagnetism tripping device earlier, then hasp 3 leaves the unblock position under the effect of first elastic component 5 and moves towards the locking position, when second cooperation portion moves to the rotation route of first cooperation portion 31 on, the notch and the locking arch of locking recess correspond, hasp 3 can continue to rotate towards the locking position under the effect of first elastic component 5, make the locking arch insert in the locking recess, first elastic component 5 forces hasp 3 to keep at the locking position, locking arch and locking recess are spacing each other, thereby support the pressure moving contact 1 on static contact 2 reliably.

In an example, referring to fig. 2 and 3, the circuit breaker may further include a button 71 and a tripping spring 72, wherein one end of the button 71 is located outside the housing, and the other end of the button 71 extends into the housing and is connected with the movable contact 1; the opening spring 72 is arranged in the shell, is connected or abutted with the moving contact 1 and is used for applying an acting force capable of enabling the moving contact 1 to be far away from the static contact 2; the second matching part is positioned on the movable contact 1.

When the movable contact 1 needs to be contacted with the fixed contact 2, the button 71 is pressed, the button 71 pushes the movable contact 1 in the direction of the fixed contact 2 to overcome the pushing force of the opening spring 72, the movable contact 1 moves towards the fixed contact 2 until contacting with the fixed contact 2, the second matching portion is located on the rotation path of the first matching portion 31, the latch 3 rotates towards the locking position under the action of the first elastic piece 5, and the first matching portion 31 is correspondingly matched with the second matching portion located on the rotation path to lock the movable contact 1.

When the moving contact 1 and the static contact 2 need to be separated, the electromagnetic tripping mechanism 4 is powered, the action end 411 pushes the latch 3 to leave the locking position, so that the second matching portion and the first matching portion 31 are separated, the limiting effect of the latch 3 on the moving contact 1 disappears, at this time, the moving contact 1 can be far away from the static contact 2 under the pushing effect of the opening spring 72, so that the button 71 is synchronously driven to move outwards of the shell, and opening is realized.

In a possible implementation manner, referring to fig. 2 and 3, the latch 3 further includes a pushing portion 32, and the actuating end 411 of the electromagnetic trip mechanism 4 faces the pushing portion 32, so as to rotate the latch 3 to the unlocking position against the acting force of the first elastic element 5 by pushing against the pushing portion 32.

Under the condition of adopting the technical scheme, the first elastic element 5 and the action end 411 of the electromagnetic tripping mechanism 4 apply opposite acting force to the latch 3, so that the latch 3 can be switched between a locking position and an unlocking position, and the functions of locking and unlocking the moving contact 1 are realized.

In one example, the distance between the first mating portion 31 and the rotation axis of the latch 3 is smaller than the distance between the pushing portion 32 and the rotation axis. By utilizing the lever principle, the electromagnetic tripping mechanism 4 can push the lock catch 3 to rotate to the unlocking position by overcoming the acting force of the first elastic piece 5 by using smaller thrust, so that the energy consumption of the electromagnetic tripping mechanism 4 can be reduced.

Wherein, the first matching part 31 and the pushing part 32 of the latch 3 can be located at two sides or the same side of the rotation axis thereof, and those skilled in the art can reasonably distribute according to the internal space structure of the circuit breaker, which is not limited in the present application.

In a possible implementation, referring to fig. 2 to 4, the circuit breaker further includes a feedback circuit board 8 and a feedback switch 6, the feedback switch 6 is connected in series in a feedback circuit of the feedback circuit board 8 for disconnecting or connecting the feedback circuit; the latch 3 further comprises a feedback end 33, the feedback end 33 pushes the feedback switch 6 at the locking position or the unlocking position, so that the feedback switch 6 has different on-off states at the locking position and the unlocking position, and the control module is electrically connected with the feedback circuit and used for controlling the electromagnetic tripping mechanism 4 to lose power when the latch 3 is at the unlocking position according to whether the feedback circuit is conducted or not.

The feedback circuit board 8 is used for feeding back the on-off state of the feedback electric loop to the control module of the circuit breaker, and the on-off state of the feedback electric loop is related to the on-off state of the feedback switch, namely when the feedback switch is closed, the feedback electric loop is switched on, and when the feedback switch is switched off, the feedback electric loop is also switched off; whether the feedback switch is opened or closed corresponds to the position of the lock catch 3; therefore, the signal fed back to the control module by the feedback circuit board 8 represents the position of the latch 3, and the latch 3 is only required to be in one-to-one correspondence between the locking position and the unlocking position and the on-off state of the feedback circuit, and is not limited to the state corresponding to the feedback circuit conduction in the locking state or the state corresponding to the feedback circuit conduction in the unlocking state.

For example, in some embodiments, when the latch 3 is in the unlocking position, the feedback circuit is turned on, and when the latch 3 is in the locking position, the feedback circuit is turned off, and the control module receives a signal indicating that the feedback circuit is turned on, and controls the electromagnetic trip mechanism 4 to lose power.

In other embodiments, when the latch 3 is in the unlock position, the feedback circuit is turned off, and when the latch 3 is in the lock position, the feedback circuit is turned on, and the control module receives a signal indicating that the feedback circuit is turned off, and controls the electromagnetic trip mechanism 4 to lose power.

Under the condition of adopting the technical scheme, when the feedback switch 6 is closed, the feedback electric loop is conducted, and the corresponding lock catch 3 is in the locking position, otherwise, when the feedback switch 6 is disconnected, the feedback electric loop is disconnected, and the corresponding lock catch 3 is in the unlocking position; the control module can judge whether the lock catch 3 is located at the unlocking position by detecting whether the feedback loop is conducted or not according to the corresponding relation, when the lock catch 3 is judged to be located at the unlocking position, the task of enabling the electromagnetic tripping mechanism 4 to be powered on and driving the lock catch 3 to be unlocked is completed, the control module can timely control the electromagnetic tripping mechanism 4 to be powered off, the thrust force of the action end 411 to the lock catch 3 is cancelled, and the energy consumption of the electromagnetic tripping mechanism 4 is reduced.

It should be noted that, in the above embodiments of the present application, the corresponding relationship between the on-off state of the feedback switch and the feedback end is not necessarily limited.

For example, in one possible embodiment, the feedback switch is a normally open switch, i.e., the feedback switch remains in an open state without external force, e.g., when the latch 3 moves to the unlocking position, the feedback switch is in the open state, and when the latch 3 moves to the locking position, the feedback terminal 33 pushes the feedback switch 6 to close, so that the feedback circuit is turned on.

In another possible embodiment, the feedback switch 6 may be a normally closed switch, i.e., the feedback switch remains closed without external force, e.g., the feedback switch is closed when the latch 3 moves to the unlocking position, and the feedback end 33 pushes the feedback switch 6 to open the feedback circuit when the latch 3 moves to the unlocking position or the locking position.

For example, when the latch 3 moves to the locking position, the feedback end 33 pushes the feedback switch 6 to be turned off, that is, in the closing state of the circuit breaker, the feedback electrical loop is in the off state, after the control module receives the unlocking command and controls the electromagnetic trip mechanism 4 to be powered, the latch 3 is pushed to the unlocking position by the electromagnetic trip mechanism 4, in the unlocking position, the thrust of the feedback end 33 to the feedback switch 6 disappears, the feedback switch 6 is closed, the feedback electrical loop is turned on, and after the control module detects that the feedback electrical loop is turned on, the control module sends a power-off command to turn off the electromagnetic trip mechanism 4, and the thrust applied to the latch 3 by the feedback end 33 disappears, so as to allow the latch 3 to move toward the locking position. Therefore, only when the lock catch 3 reaches the unlocking position, the feedback switch 6 can be closed, the feedback circuit can be conducted, and the electromagnetic tripping mechanism 4 is powered off to cause the lock catch 3 to be disconnected again after being separated from the unlocking position, so that the conduction time of the feedback circuit is short, and the energy conservation is facilitated. In an example, referring to fig. 2 and 3, the normally closed switch includes a torsion spring 64, and a first probe 61, a second probe 62 and a fixed column 63 mounted on the feedback circuit board 8, the torsion spring 64 is sleeved on the fixed column 63, the torsion spring 64 has a first pin 641 and a second pin 642, and the first pin 641 is in conductive contact with the first probe 61; when the latch 3 moves to the locking position, the feedback end 33 pushes the second pin 642 to be away from the second probe 62, the feedback switch 6 is turned off, and when the latch 3 moves to the unlocking position, the second pin 642 is pressed against the second probe 62, and the feedback switch 6 is turned on.

The torsion spring 64 is used as an elastic member, when in a free state without external force, the first pin 641 is in contact with the first probe 61, the second pin 642 is in contact with the second probe 62, when the latch 3 moves away from the unlocking position toward the locking position, the feedback end 33 of the latch 3 pushes the second pin 642 to push away from the second probe 62, and the feedback switch 6 is turned off.

That is, the second pin 642 has an open position and a closed position, and in order to accurately detect whether the feedback breaker is turned on or not, the second pin 642 may be located at the closed position when the latch 3 moves to the unlocked position, and when the latch 3 moves from the unlocked position to the locked position, the second pin 642 is pushed away from the second probe 62 and moves synchronously with the latch 3 until the latch 3 stops moving. In other words, under the action of the self-elasticity of the torsion spring 64, the second pin 642 always tends to approach the second probe 62, but the second pin 642 cannot contact the second probe 62 under the pushing of the feedback end 33 of the latch 3, but the second pin 642 just can contact the second probe 62 when the latch 3 moves to the unlocking position. Therefore, in the process that the latch 3 moves towards the unlocking position, the latch 3 is pushed by the second pin 642 as well as the electromagnetic trip mechanism 4, and the pushing force of the second pin 642 and the pushing force of the electromagnetic trip mechanism 4 jointly push the latch 3 to move towards the unlocking position, which is beneficial to reducing the energy consumption of the electromagnetic trip mechanism 4.

Through the technical scheme, the normally closed switch is closed only when the lock catch 3 moves to the unlocking position, so that the energy consumption of a feedback circuit is reduced, and the lock catch 3 can be accurately fed back to the unlocking position; in addition, the second pin 642 and the electromagnetic tripping mechanism 4 jointly push the latch 3 to move towards the unlocking position, which is beneficial to reducing the energy consumption of the electromagnetic tripping mechanism 4.

In a possible embodiment, the control module may have a detection unit and a control unit, the control unit is configured to send a power-on instruction or a power-off instruction to control the electromagnetic trip mechanism 4 to be powered on or powered off, the detection unit is electrically connected to the feedback circuit and is configured to detect whether the feedback circuit is turned on and send information of whether the feedback circuit is turned on to the control unit, and the control unit determines that the latch 3 reaches the unlocking position according to the information sent by the detection unit, so as to send the power-off instruction to power off the electromagnetic trip mechanism 4.

In one example, the control unit may be a power-on instruction issued according to an unlocking command received from the outside, for example, an unlocking button may be provided on the circuit breaker, and when the unlocking button is pressed, the control unit receives a command to be decoded and then issues the power-on instruction.

In an example, the circuit breaker still includes the shunt, and the shunt is connected with the major loop electricity of circuit breaker for detect the electric current size in the major loop, and feed back control unit with its real-time, control unit passes through the electric current size and judges whether transshipping, if transship, control unit sends automatically and gets electric instruction, gets electricity in order to control electromagnetic trip mechanism 4 and in order to unblock hasp 3, thereby makes the circuit breaker disconnection, realizes overload protection.

In one example, the circuit breaker further comprises a patch inductor, the patch inductor is electrically connected with a main loop of the circuit breaker and used for detecting the current climbing rate in the main loop and feeding the current climbing rate back to the control unit in real time, the control unit judges whether short circuit occurs according to the current climbing rate, if the short circuit occurs, the control unit automatically sends out an electricity obtaining instruction to control the electromagnetic tripping mechanism 4 to obtain electricity so as to unlock the lock catch 3, so that the circuit breaker is disconnected, and short circuit protection is realized.

In one example, when the latch 3 is located at the locking position, the feedback electric loop is conducted, and when the latch 3 needs to be unlocked, the control unit receives an external unlocking instruction and then sends an electrifying instruction to electrify the electromagnetic tripping mechanism 4, so that the latch 3 is pushed to move towards the unlocking position; when the latch 3 reaches the unlocking position, the feedback end 33 of the latch 3 turns off the feedback switch 6, so that the feedback electric loop is disconnected, the detection unit detects that the feedback electric loop is switched from the on state to the off state, and then sends a disconnection message to the control unit, and the control unit receives the disconnection message, and then confirms that the latch 3 reaches the unlocking position, so that a power-off instruction is sent out to power off the electromagnetic tripping mechanism 4, and the latch 3 is allowed to move from the unlocking position to the locking position.

In one example, the circuit breaker further comprises a switch circuit board, a switch circuit is arranged on the switch circuit board, the control unit and the electromagnetic tripping mechanism 4 are both electrically connected with the switch circuit, and the switch circuit receives and executes a power-on command and a power-off command of the control unit, so that the electromagnetic tripping mechanism 4 is controlled to be powered on or powered off.

In a possible embodiment, referring to fig. 1 and 2, the latch 3 may be rotatably connected to a housing of the circuit breaker, the first matching portion 31 and the pushing portion 32 are distributed on two sides of a rotation axis, the first matching portion 31 corresponds to the second matching portion on the movable contact 1, the pushing portion 32 corresponds to the actuating end 411 of the electromagnetic trip mechanism 4, the feedback end 33 and the pushing portion 32 are located on the same side, but the feedback end 33 is far away from the stationary contact 2, the pushing portion 32 is close to the stationary contact 2, and the feedback switch 6 is located on the same side of the feedback end 33 and the pushing portion 32 and is far away from the stationary contact 2. Thus, when the latch 3 is unlocked, the first matching portion 31 moves away from the movable contact 1, and the pushing portion 32 and the feedback end 33 move toward the direction away from the feedback switch 6 and close to the fixed contact 2, if the feedback switch 6 is a normally closed switch, the feedback switch 6 is closed when the latch 3 is unlocked, and the feedback switch 6 is opened when the latch is unlocked and locked.

In a possible embodiment, referring to fig. 5, the electromagnetic trip mechanism 4 includes a push rod 41, a plunger 42, an electromagnetic coil 43, a second elastic member 44 and a coil frame 45, wherein the electromagnetic coil 43 is electrically connected with the control module and surrounds the coil frame 45; the bobbin 45 has a receiving cavity and a stopper 46, the stopper 46 being located at an opening of the receiving cavity; the movable iron core 42 is in sliding fit in the accommodating cavity, one end of the push rod 41 extends into the accommodating cavity to be connected with the movable iron core 42, and the other end is an action end 411 which extends out of the accommodating hole; one end of the second elastic element 44 abuts against the movable iron core 42, and the other end abuts against the stop element 46.

In one example, the solenoid 43 may be electrically connected to the switching circuit described above to be energized or de-energized under control of the control module.

In one example, the second elastic member 44 may be a spring and is sleeved on the push rod 41. In this way, the second elastic member 44 can provide a thrust force with a stable direction for the push rod 41, so that the push rod 41 can reciprocate stably along its own axial direction.

In one example, the bobbin 45 is fixed to the housing,

under the condition of adopting the technical scheme, the electromagnetic coil 43 is powered on or powered off under the control of the control module, a magnetic field is generated when the electromagnetic coil is powered on, and under the action of the magnetic field, the movable iron core 42 overcomes the second elastic piece 44 to move towards the opening of the accommodating cavity, so that the action end 411 of the push rod 41 moves towards the lock catch 3 to push the lock catch 3; when the power is lost, the magnetic field disappears, and under the action of the second elastic element 44, the movable iron core 42 synchronously drives the action end 411 of the push rod 41 to move reversely and away from the latch 3, so that the unlocking force applied to the latch 3 disappears.

In one possible embodiment, the circuit breaker may be a plug-in circuit breaker. The plug-in circuit breaker has the advantages of arc-free opening, energy conservation and good safety performance.

To sum up, the circuit breaker that this application provided has no arc separating brake, the high advantage of security.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (9)

1. A circuit breaker is characterized by comprising a switching device, a lock catch, a moving contact, a static contact and an electromagnetic tripping mechanism;

the switching device, the moving contact and the fixed contact are connected in series in a main loop of the circuit breaker;

the lock catch is movably arranged in a shell of the circuit breaker, is used for limiting the moving contact, and is provided with a locking position and an unlocking position, wherein the locking position enables the moving contact and the static contact to be kept in a contact state, and the unlocking position releases the limit of the moving contact to allow the moving contact and the static contact to be separated;

the action end of the electromagnetic tripping mechanism faces the lock catch and is used for pushing the lock catch when power is supplied, so that the lock catch moves from the locking position to the unlocking position;

the switch device and the electromagnetic tripping mechanism are respectively and electrically connected with a control module of the circuit breaker, and the control module is used for controlling the switch device to be switched on or switched off and controlling the electromagnetic tripping mechanism to be powered on after the switch device is switched off or when the switch device is switched off.

2. The circuit breaker of claim 1, wherein the latch is rotatably coupled to the housing, the circuit breaker further comprising a first resilient member having one end fixed inside the housing and the other end coupled to the latch to apply a resilient force to the latch that urges the latch to move from the unlocked position to the locked position.

3. The circuit breaker of claim 2, wherein the latch comprises a first engaging portion, and a second engaging portion is disposed on the moving contact, and the first engaging portion and the second engaging portion cooperate with each other to lock the moving contact in the locking position, wherein one of the first engaging portion and the second engaging portion is a locking protrusion and the other is a locking recess, and the locking protrusion is inserted into the locking recess in the locking position.

4. The circuit breaker of claim 3, wherein the latch further comprises a pushing portion, and an actuating end of the electromagnetic trip mechanism faces the pushing portion, so as to rotate the latch to the unlocking position against the force of the first elastic member by pushing the pushing portion.

5. The circuit breaker of claim 4, wherein a distance between the first mating portion and a rotational axis of the latch is less than a distance between the push portion and the rotational axis.

6. The circuit breaker of claim 1, further comprising a feedback circuit board and a feedback switch, wherein the feedback switch is connected in series in a feedback circuit of the feedback circuit board for opening or closing the feedback circuit;

the lock catch further comprises a feedback end, and the feedback end pushes the feedback switch at the locking position or the unlocking position so that the feedback switch has different opening and closing states at the locking position and the unlocking position;

the control module is electrically connected with the feedback circuit and used for controlling the electromagnetic tripping mechanism to lose power when the lock catch is in the unlocking position according to whether the feedback circuit is conducted or not.

7. The circuit breaker of claim 6, wherein the feedback switch is a normally closed switch, the feedback switch being in a closed state when the latch is moved to the unlocked position; when the lock catch moves to the locking position, the feedback end pushes the feedback switch to be switched off.

8. The circuit breaker of claim 7, wherein the normally closed switch comprises a torsion spring, and a first probe, a second probe and a fixed column mounted on the feedback circuit board, the torsion spring is sleeved on the fixed column, the torsion spring has a first pin and a second pin, and the first pin is in conductive contact with the first probe;

when the lock catch moves to the locking position, the feedback end pushes the second pin to be far away from the second probe, and the feedback switch is switched off;

when the lock catch moves to the unlocking position, the second pin is in abutting contact with the second probe, and the feedback switch is closed.

9. The circuit breaker according to any of claims 1-8, wherein the circuit breaker is a plug-in circuit breaker.

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