CN218513404U - Plug-in circuit breaker - Google Patents

Abstract

The application belongs to the technical field of electrical equipment, and the embodiment provides a plug-in circuit breaker, including switching device, locking piece and release mechanism. The switching device is connected to a main circuit of the circuit breaker; the locking piece is movably arranged in the shell of the circuit breaker and used for limiting the position of a moving contact of the circuit breaker so as to keep the moving contact in contact with a fixed contact of the circuit breaker; the unlocking mechanism comprises a trigger rod and a sensing device; the trigger rod is used for being stressed to move towards the locking piece, the sensing device is used for sending a signal to a controller of the circuit breaker when the trigger rod is detected to move to a preset position, and the controller controls the switching device to be switched off according to the signal; the triggering rod is also used for triggering the locking piece after the switch device is disconnected, so that the locking piece releases the limitation on the position of the movable contact. The circuit breaker provided by the embodiment of the application can realize non-arc breaking during opening, avoid ablation and loss of the moving contact and the static contact, and prolong the service life of the circuit breaker.

Description

Plug-in circuit breaker

Technical Field

The embodiment of the application relates to the technical field of electrical equipment, in particular to a plug-in circuit breaker.

Background

The circuit breaker is a switching device capable of closing, carrying and breaking a current in a loop, and can be controlled to open and close a circuit to protect electrical elements and the like in the circuit in which the circuit breaker is located under the condition of circuit abnormality, so that the circuit breaker is widely applied to power electronic systems.

Current circuit breaker is when the separating brake, produces electric arc easily between moving contact and the static contact, and the electric arc of high temperature can cause the ablation and the loss of moving contact and static contact, also can make the inside temperature of circuit breaker rise, brings the safety risk to the use of circuit breaker, also can cause the life-span reduction of circuit breaker, increases use cost.

SUMMERY OF THE UTILITY MODEL

In view of the above, embodiments of the present application provide a circuit breaker that overcomes or at least partially solves the above problems.

The embodiment of the application provides a plug-in circuit breaker, includes: a switch device, a locking piece and an unlocking mechanism; the switching device is connected to a main circuit of the circuit breaker; the locking piece is movably arranged in the shell of the circuit breaker and used for limiting the position of a moving contact of the circuit breaker so as to keep the moving contact in contact with a fixed contact of the circuit breaker; the unlocking mechanism comprises a trigger rod and a sensing device; the trigger rod is used for being stressed to move towards the locking piece, the sensing device is used for sending a signal to a controller of the circuit breaker when the trigger rod is detected to move to a preset position, and the controller controls the switching device to be switched off according to the signal; the triggering rod is also used for triggering the locking piece after the switch device is disconnected, so that the locking piece releases the limitation on the position of the movable contact.

By adopting the scheme, when the unlocking mechanism works, the trigger rod is stressed to move towards the locking piece, when the sensing device detects that the trigger rod moves to the preset position, the sensing device sends a signal to the controller, the controller controls the switching device to be disconnected, the current on the main circuit of the circuit breaker connected with the switching device in series is also disconnected, and the trigger rod continues to move towards the locking piece until the locking piece is triggered, so that the locking piece relieves the limitation on the position of the movable contact, and the movable contact can be separated from the static contact; because the current of the main loop of the circuit breaker is already cut off before the trigger rod of the unlocking mechanism triggers the locking piece, when the moving contact and the static contact are separated, electric arc cannot be generated, and then the circuit breaker can realize non-arc breaking, avoid ablation and loss of the moving contact and the static contact, and prolong the service life of the circuit breaker.

In some embodiments, the plug-in circuit breaker further includes a breaking stopper and a breaking spring, the breaking spring is disposed between the moving contact and the segment stopper, and when the static contact is in contact with the moving contact, the breaking spring is in a compressed state and has a tendency of pushing against the moving contact in a direction away from the static contact.

By adopting the scheme, the trigger rod triggers the locking piece, so that the locking piece releases the position limitation on the moving contact, the compressed breaking spring starts to restore and deform, the breaking spring pushes the moving contact to move in the direction away from the static contact, the moving contact is separated from the static contact, the main loop of the circuit breaker is powered off at the moment, and electric arcs cannot be generated when the breaking spring drives the moving contact to be separated from the static contact; when the breaker is used, if faults occur, the fact that the switch-off device and the locking piece are disconnected to limit the position of the moving contact and the fixed contact are separated can be achieved in sequence by operating the trigger rod.

In some embodiments, the plug-in circuit breaker further comprises a locking reset for resetting the locking member to a state of restricting the position of the movable contact.

By adopting the scheme, the trigger rod is stressed to move towards the locking piece, and the locking piece is enabled to remove the limitation on the moving contact until the locking piece is triggered, wherein in the process from the limitation on the moving contact to the removal of the limitation on the moving contact, the state of the locking piece is changed, and meanwhile, the locking reset piece is also accumulated in deformation to store energy, so that the locking reset trend is achieved; until when the circuit breaker is closed again, the moving contact contacts with the static contact, the action force of the trigger rod to the locking piece disappears, the locking reset piece recovers deformation, the locking piece is driven to reset, the locking piece is recovered to be in a state of limiting the moving contact, and the moving contact and the static contact are kept in contact. Like this, need not the operation locking piece, direct reset through the locking piece drive locking piece that resets, easy operation for the operation of circuit breaker is simple more, swift.

In some embodiments, the unlocking mechanism further comprises a trigger reset for resetting the trigger lever away from the locking member.

Through adopting above-mentioned scheme, after the trigger lever atress that is in initial position moved and triggers the locking piece to the locking piece, the trigger lever is located terminal position, the effort that the trigger lever received disappears, need not to operate the trigger lever and make it reset, can make the trigger lever resume to initial condition's position from terminal position automatically through triggering the piece that resets, consequently, trigger the piece that resets and can reduce release mechanism's operation procedure, conveniently know the use of latch mechanism and improve release mechanism's work efficiency, the use of circuit breaker is more convenient, and is simple.

In some embodiments, one end of the trigger reset piece is arranged on the trigger rod, and the other end of the trigger reset piece is connected with the shell; the trigger reset piece stores energy in the process that the trigger rod moves towards the locking piece, so that when the force acting on the trigger rod disappears, the energy is released to push the trigger rod to reset.

By adopting the scheme, when the trigger rod is at the initial position, the trigger resetting piece is in a natural state; when the trigger rod is stressed to move towards the locking piece, one end of the trigger reset piece, which is connected with the trigger rod, gradually approaches or departs from the other end of the trigger reset piece along with the movement of the trigger rod, the trigger reset piece deforms, after the trigger rod triggers the locking piece to enable the locking piece to remove the limitation on the moving contact, the external force acting on the trigger rod is removed, and the trigger reset piece immediately restores to deform; in the process of recovering deformation, the trigger resetting piece is connected with one end of the trigger rod and moves towards the direction far away from the locking piece, and the trigger rod resets to the initial position after the trigger resetting piece recovers deformation.

In some embodiments, the unlocking mechanism further comprises a scram circuit board, the scram circuit board is fixed on the housing, and the sensing device is arranged on the scram circuit board.

By adopting the scheme, the sensing device can be integrated on the emergency stop circuit board, the signal connection between the sensing device and the emergency stop circuit board is realized through the circuit on the emergency stop circuit board, and then the sensing device does not need to be directly connected with the controller by adopting a lead, so that the connection structure of the sensing device is simplified, and the reliable assembly of the sensing device can be realized through the emergency stop circuit board.

In some embodiments, the sensing device is configured as a hall sensor and the trigger lever has a magnet disposed thereon.

Through adopting above-mentioned scheme, along with the trigger lever to the locking piece motion, magnet is also moving to hall sensor, and hall sensor detects magnetic field intensity stronger and stronger, and when the trigger lever moved to predetermineeing the position, magnetic field intensity also reached certain degree, triggers hall sensor this moment and goes out signal transmission, and the controller received behind this signal control switch device disconnection, had not had the electric current on the major loop of circuit breaker and passed through. The Hall sensor is used as a common sensing device for detecting distance or position, has the advantages of small volume, light weight, long service life, convenience in installation, low power, high frequency and the like, and is more suitable for the electric equipment of the plug-in circuit breaker with development directions of miniaturization, light weight, low energy consumption and the like.

In some embodiments, the trigger rod is provided with a mounting hole, and the magnet is mounted in the mounting hole.

Through adopting above-mentioned scheme, magnet setting makes things convenient for the installation of magnet in the mounting hole, compares with the mode that magnet setting was on the trigger bar surface, and magnet need not additionally to occupy the trigger bar exterior space, has not only saved circuit breaker inner space, prevents moreover that convex magnet from taking place to collide with or rock at the in-process that removes and lead to droing to realize the reliable connection of magnet and trigger bar.

In some embodiments, an end of the trigger lever remote from the lock extends out of the housing to enable the trigger lever to be manually operated.

By adopting the scheme, the working personnel can operate the trigger lever by adopting the modes of manual pressing, pushing and pulling and the like, and the unlocking mechanism is convenient to operate manually.

In some embodiments, a guide channel is arranged on the inner wall of the shell, and the trigger rod is arranged in the guide channel in a sliding mode.

Through adopting above-mentioned scheme, the trigger bar can use the wall of direction passageway to depend on to slide along the extending direction of direction passageway under the limiting action of the wall of direction passageway, avoid like this because the operation is not normal, the first end movement track that leads to the trigger bar takes place the skew and the condition emergence that can't accurately trigger the locking piece, and then can guarantee the smooth motion of trigger bar steadily at release mechanism during operation.

Compared with the prior art, the beneficial effects of this application are as follows:

according to the application, the trigger rod is stressed to move towards the locking piece, when the sensing device detects that the trigger rod moves to a preset position, the sensing device sends a signal to the controller, the controller controls the switching device to be disconnected, the current on a main circuit of the circuit breaker connected with the switching device in series is also disconnected, and the trigger rod continues to move towards the locking piece until the locking piece is triggered, so that the locking piece relieves the limitation on the position of the moving contact, and the moving contact can be separated from the static contact; because the current of the main loop of the circuit breaker is already cut off before the trigger rod of the unlocking mechanism triggers the locking piece, when the moving contact is separated from the static contact, electric arcs cannot be generated, and then the circuit breaker can realize arc-free breaking, the ablation and the loss of the moving contact and the static contact are avoided, and the service life of the circuit breaker is prolonged.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and in order that the technical means of the embodiments of the present application can be clearly understood, the embodiments of the present application are specifically described 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 structure of a plug-in circuit breaker according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of an internal structure of another plug-in circuit breaker according to an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

fig. 4 is a schematic view of the internal structure of the circuit breaker when the trigger lever moves toward the locking member;

fig. 5 is a schematic view of the internal structure of the circuit breaker with the trip lever in the end position;

fig. 6 is a schematic view of the internal structure of the circuit breaker when the trip lever is reset from the end position to the initial position;

FIG. 7 is a schematic mechanism diagram of the trigger lever;

FIG. 8 is a schematic view of the relative positions and configurations of the unlocking mechanism and the locking member;

fig. 9 is a schematic diagram of an internal structure of another plug-in circuit breaker according to an embodiment of the present application.

Reference numerals: 100-shell, 110-first power terminal, 120-second power terminal, 130-first load terminal, 140-second load terminal, 150-limiting block, 160-breaking block, 1-switching device, 2-moving contact, 3-static contact, 4-locking piece, 41-locking reset piece, 5-unlocking mechanism, 51-trigger rod, 51-1-first rod, 51-2-second rod, 511-mounting hole, 512-limiting boss, 52-sensing device, 53-magnet, 54-triggering reset piece, 55-emergency stop circuit board, 551-mounting boss, 6-controller, 7-main circuit board and 8-breaking spring.

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 obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to 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 drawings are intended to cover, but not to exclude, other elements. The word "a" or "an" does not exclude a plurality.

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: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The directional terms appearing in the following description are directions shown in the drawings, and do not limit the specific structure of the circuit breaker of the present application. For example, in the description of the present application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus are not to be construed as limiting the present application.

Further, expressions of indication directions such as an X direction, a Y direction, and a Z direction, which are used to explain operations and configurations of each member of the circuit breaker of the present embodiment, are not absolute but relative, and although these indications are appropriate when each member of the plug-in circuit breaker is in the position shown in the drawings, when the positions are changed, the directions should be interpreted differently to correspond to the change.

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. "connected" or "connected" of circuit structures may mean not only physically connected but also electrically connected or signal-connected, for example, directly connected, i.e., physically connected, or indirectly connected through at least one intervening component, as long as the circuits are in communication, or communication between the interiors of two components; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

A circuit breaker refers to a switching device capable of closing, carrying and breaking current in a circuit. The circuit breaker generally realizes the conduction of a loop through closing and realizes the disconnection of the loop through opening, wherein the circuit breaker is characterized in that a moving contact in the circuit breaker is contacted with a fixed contact in the closing state, and the circuit breaker is characterized in that the moving contact in the circuit breaker is separated from the fixed contact in the opening state. Generally, a fixed contact is at a fixed position in a circuit breaker, and the contact of a moving contact and a static contact during closing or the separation of the moving contact and the static contact during opening is realized by controlling the movement of a moving contact.

The existing circuit breaker generates electric arc between the moving contact and the fixed contact when the circuit breaker is opened, the electric arc can cause ablation and loss of the moving contact and the fixed contact, the internal temperature of the circuit breaker can also be increased, safety risks are brought to the use of the circuit breaker, the service life of the circuit breaker can be shortened, and the use cost is increased.

As shown in fig. 1, an embodiment of the present application provides a circuit breaker, including: a switch device 1, a lock 4, and an unlock mechanism 5; the switching device 1 is connected in series with a main circuit of the circuit breaker; the locking piece 4 is movably arranged in a shell 100 of the circuit breaker, and the locking piece 4 is used for limiting the position of the movable contact 2 of the circuit breaker so as to keep the movable contact 2 in contact with the fixed contact 3 of the circuit breaker; the unlocking mechanism 5 comprises a trigger lever 51 and a sensing device 52; the trigger rod 51 is used for being forced to move towards the locking piece 4, the sensing device 52 is used for sending a signal to the controller 6 of the circuit breaker when the trigger rod 51 is detected to move to a preset position, and the controller 6 controls the switch device 1 to be switched off according to the signal; the triggering lever 51 is also used to trigger the locking member 4 after the switching device 1 is turned off, so that the locking member 4 releases the restriction on the position of the movable contact 2.

The case 100 of the circuit breaker may be a long and narrow rectangular hollow case, and taking the circuit breaker in fig. 1 as an example, the case 100 may be used to fix structural members in the circuit breaker, and may also protect the structural members located inside the circuit breaker, so as to prevent safety accidents or damage to the operational reliability of the circuit breaker due to the exposure of the structural members.

The main circuit of the circuit breaker is explained below with reference to fig. 1. Along the length direction of the case 100 of the circuit breaker, one end of the circuit breaker is a power supply end for connecting a power supply, and comprises a first power supply terminal 110 and a second power supply terminal 120; the other end of the housing 100 is a load end for connecting a load, and includes a first load terminal 130 and a second load terminal 140. The first load terminal 130 is connected to the movable contact 2, the first power terminal 110 is connected to the stationary contact 3, and the second load terminal 140 is connected to the second power terminal 120; when the circuit breaker is switched on, the moving contact 2 is in contact with the fixed contact 3, the main loop current of the circuit breaker is conducted, and the load connected between the first load terminal 130 and the second load terminal 140 is electrified. For example, in a possible manner, the first power terminal 110 is used to connect the positive pole of the power source, the second power terminal 120 is used to connect the negative pole of the power source, the first load terminal 130 is used to connect the positive pole of the load, and the second load terminal 140 is used to connect the negative pole of the load, then the main circuit of the circuit breaker is: the first power supply terminal 110-the stationary contact 3-the movable contact 2-the first load terminal 130-the load-the second load terminal 140-the second power supply terminal 120. When the circuit breaker is closed and energized, current passes through the elements of each main circuit.

With reference to fig. 1, after the switching device 1 is connected in series in the main circuit of the circuit breaker, the current on/off of the main circuit of the closed circuit breaker can be controlled by controlling the on/off of the switching device 1, wherein the switching device 1 can be connected in series between any two elements in the main circuit of the circuit breaker, and can be directly connected in series into the main circuit through a wire, or the switching device 1 can be integrated on a certain element, and the series connection of the switching device 1 into the main circuit is realized by connecting the element into the main circuit. For example, in a possible manner, as shown in fig. 2, the circuit breaker may further include a main circuit board 7, and the switching device 1 may be disposed on the main circuit board 7, the main circuit board 7 being connected in series with the main circuit of the circuit breaker. When the circuit breaker is switched on, the main loop of the circuit breaker is communicated and current passes through, at the moment, if the switching device 1 is switched off, no current passes through the main loop of the circuit breaker, and if the circuit breaker is switched off, no voltage difference exists between the moving contact 2 and the static contact 3, so that the moving contact 2 and the static contact 3 can be separated in an arc-free manner.

The locking element 4 is movably disposed in the housing 100 of the circuit breaker, which means that the locking element 4 is connected to the inner cavity of the housing 100, but the locking element 4 can be forced to move relative to the housing 100, and such relative movement can be that the locking element 4 rotates or/and moves relative to the housing 100, as long as the position of the movable contact 2 can be limited and can be released by the locking element 4 through movement.

The following explains the use of the locking member 4 for limiting the position of the movable contact 2 of the circuit breaker to keep the movable contact 2 in contact with the stationary contact 3, taking the circuit breaker as an example in an embodiment of the present application. As shown in fig. 1-3, after the circuit breaker is switched on, the static contact 3 is in contact with the moving contact 2, and at this time, the locking member 4 is connected to the moving contact 2, so that the moving contact 2 cannot move, and further, the position of the moving contact 2 is limited, so that the moving contact is kept in contact with the static contact 3, and at this time, the moving contact 2 cannot be directly separated from the static contact 3 to realize switching off; if the breaker needs to be opened, the locking piece 4 is required to move, the locking piece 4 is not connected with the moving contact 2, the locking piece 4 can be released to be the position limitation of the locking piece 4, and the moving contact 2 can be separated from the static contact 3, so that the opening of the breaker is realized.

The moving contact 2 and the static contact 3 can be separated in various ways. In a feasible mode, the movable contact 2 is moved away from the fixed contact 3 by pulling the handle, and the manual switching-on and switching-off mode is simple to operate, and the service life of the circuit breaker is longer because a mechanical structure is mainly adopted; in another feasible mode, a compressed elastic element can be utilized to apply force to the moving contact 2 in the process of restoring deformation, so that the moving contact 2 is far away from the static contact 3, and the moving contact and the static contact are separated; the brake separating mode can realize automatic brake separating and has quick action. Although the structure and implementation manner for controlling the moving contact 2 to be away from the fixed contact 3 are different in the above two different manners, the locking element 4 needs to be released from the limitation on the position of the moving contact 2, so as to separate the moving contact 2 from the fixed contact 3.

In the embodiment, the trigger rod 51 can be moved towards the locking member 4 by applying force to the trigger rod 51 manually, electrically, pneumatically or by other operation methods; the process of triggering the locking piece 4 by the trigger lever 51 can be in a contact or non-contact manner; for example, in a possible mode, the trigger rod 51 is forced to move, so that one end of the trigger rod 51 directly contacts with the locking member 4 and exerts a certain force on the locking member 4, and the locking member 4 is driven to remove the limitation on the position of the locking member 4; for another example, in a feasible manner, magnetic members are disposed on one end of the trigger rod 51 and the locking member 4, and the opposite sides of the two magnetic members have the same magnetism, and by using the principle that like poles repel each other, the end of the trigger rod 51 approaches the locking member 4 until the locking member 4 is driven to move under the action of a magnetic field, so as to drive the locking member 4 to release the restriction on the position of the locking member 4.

It should be noted that, during the process of the trigger rod 51 being forced to move towards the locking member 4, the trigger rod 51 can move in various ways, for example, the trigger rod 51 can be pushed to move in a translational motion close to the locking member 4; for another example, the middle portion of the trigger rod 51 is rotatably disposed, and one end of the trigger rod 51 is forced to drive the other end of the trigger rod 51 to approach the locking member 4 in a swinging manner.

The sensing means 52 can be various, for example, the sensing means 52 can be a contact-type sensing means 52, such as a travel switch, and when the trigger rod 51 touches the travel switch during the movement, the internal contact of the travel switch is actuated, thereby performing the control function. The sensor device 52 may be a non-contact type, such as an electromagnetic type, a photoelectric type, a differential transformer type, an eddy current type, a capacitor type, a reed switch, a hall type, or the like.

The sensing device 52 is used for detecting the position of the movement of the trigger lever 51, until when the trigger lever 51 moves to a preset position, the sensing device 52 sends a signal to the controller 6, and the controller 6 controls the switch device 1 to be switched off. In a possible manner, as shown in fig. 2, both the switch device 1 and the controller 6 may be integrated on the main circuit board 7, and the electrical connection between the switch device and the controller is realized through the circuit of the main circuit board 7, so that the connection conduction can also be reduced, and the internal structure of the circuit breaker is simplified.

The preset position is a certain position on the moving path of the trigger rod 51 at a certain moment in the process from the moment that the trigger rod 51 is forced to move towards the locking piece 4 to the moment that the locking piece 4 releases the limitation on the movable contact 2.

By adopting the scheme, when the unlocking mechanism 5 works, the trigger rod 51 is forced to move towards the locking piece 4, when the sensing device 52 detects that the trigger rod 51 moves to the preset position (as shown in fig. 4), the sensing device 52 sends a signal to the controller 6, the controller 6 controls the switching device 1 to be disconnected, the current on the main circuit of the circuit breaker connected with the switching device 1 in series is also disconnected, the trigger rod 51 continues to move towards the locking piece 4 until the locking piece 4 is triggered, so that the locking piece 4 relieves the limitation on the position of the movable contact 2, and the movable contact 2 can be separated from the fixed contact 3; because the current of the main loop of the circuit breaker is already cut off before the trigger rod 51 of the unlocking mechanism 5 triggers the locking piece 4, when the moving contact 2 and the static contact 3 are separated, electric arc cannot be generated, and then the circuit breaker can realize non-arc breaking, avoid ablation and loss of the moving contact 2 and the static contact 3, and prolong the service life of the circuit breaker.

Because the circuit breaker in the use, can take place serious overload, short circuit or trouble such as undervoltage, current circuit breaker can not carry out scram and automatically cut off the circuit when the trouble, and there is the safety risk in such circuit breaker product.

In order to reduce the above-mentioned situation, in some embodiments, as shown in fig. 5, the plug-in circuit breaker further includes a breaking stopper 160 and a breaking spring 8, the breaking spring 8 is disposed between the movable contact 2 and the breaking stopper 160, and when the fixed contact 3 contacts the movable contact 2, the breaking spring 8 is in a compressed state and has a tendency of pushing the movable contact 2 in a direction away from the fixed contact 3.

The breaking stopper 160 may be disposed on the housing 100, or may be disposed on another component inside the circuit breaker, as long as when the moving contact 2 is far away from the stationary contact 3, the breaking stopper does not move in a direction far away from the stationary contact 3 relative to the moving contact 2.

By adopting the scheme, the trigger rod 51 triggers the locking piece 4, so that the locking piece 4 releases the position limitation on the moving contact 2, the compressed breaking spring 8 starts to restore deformation, the breaking spring 8 pushes the moving contact 2 to move in the direction away from the static contact 3, the moving contact 2 is separated from the static contact 3, and in combination with the above, when the main circuit of the circuit breaker is powered off, electric arcs cannot be generated in the process that the breaking spring 8 drives the moving contact 2 to be separated from the static contact 3; in the using process of the circuit breaker, if faults occur, the breaking switch device 1 and the locking piece 4 can be sequentially released from the position limitation of the moving contact 2 and the static contact 3 can be separated by operating the trigger rod 51, the action in the process is rapid, simple and reliable, and the moving contact 2 does not need to be operated in the whole process, so that the circuit breaker can be automatically opened, and therefore, if faults such as serious overload, short circuit or undervoltage occur in the using process of the circuit breaker, the circuit breaker can be suddenly stopped to cut off a circuit, and the use safety is ensured; in addition, the breaking spring 8 is simple in structure, stable and reliable, so that the breaker is simple in structure and long in service life.

As shown in fig. 5, in some embodiments, the circuit breaker further comprises a locking reset member 41 for resetting the locking member 4 to a state of limiting the position of the movable contact 2.

The locking reset member 41 may be configured as a torsion spring, as shown in fig. 5, one end of which abuts against the housing 100 and the other end of which abuts against the locking member 4; the locking reset member 41 may be configured as a circlip or a spiral spring member.

The operation of the locking reset 41 will be explained in conjunction with a possible mode of the present application, in which the trigger rod 51 moves in a translational motion toward the locking element 4, one end of the trigger rod 51 close to the locking element 4 touches the locking element 4 (as shown in fig. 4), and the locking element 4 rotates counterclockwise under the action of the trigger rod 51 to move the locking element 4 away from the movable contact 2 until the position of the movable contact 2 cannot be limited (as shown in fig. 5), wherein the locking reset 41 accumulates elastic deformation during the rotation of the locking element 4 under the action of the trigger rod 51; when the circuit breaker is switched on again after being switched off, the movable contact 2 is firstly contacted with the static contact 3 manually or in other modes, the locking reset part 41 restores deformation and drives the locking part 4 to rotate clockwise until the locking part 4 is restored to be connected with the movable contact 2, the locking part 4 limits the displacement of the position of the movable contact 2, and the movable contact 2 is kept at the position contacted with the static contact 3.

In some embodiments, with continued reference to fig. 3-6, the unlocking mechanism 5 further comprises a trigger reset 54, the trigger reset 54 being configured to reset the trigger lever 51 away from the locking member 4.

Before the trigger rod 51 is forced, the trigger rod 51 is in an initial position (as shown in fig. 3), the trigger rod 51 is forced to move, and the trigger rod 51 contacts and starts to push the locking member 4 (as shown in fig. 4) until the locking member 4 releases the limitation on the position of the movable contact 2, and at this time, the trigger rod 51 is in a final position (as shown in fig. 5), and the circuit breaker can be opened. However, when a subsequent circuit breaker is switched on, the trigger rod 51 needs to be operated to restore the trigger rod 51 from the end position to the initial position, so that the acting force on the locking member 4 can be removed, and the locking member 4 can limit the moving contact 2 when the moving contact 2 and the static contact 3 are in contact with each other, so that the moving contact 2 and the static contact 3 are kept in contact with each other; if the trigger rod 51 is forced to reset by another operation (such as a manual reset mode), obviously, the operation is too complicated and the working efficiency is influenced; therefore, the triggering and resetting piece 54 is provided in this embodiment, after the triggering rod 51 is forced to move towards the locking piece 4 and trigger the locking piece 4, the acting force applied to the triggering rod 51 disappears, the triggering and resetting piece 54 can enable the triggering rod 51 to be restored to the position of the initial state from the end position (as shown in fig. 6), and the triggering rod 51 does not need to be operated when the circuit breaker is switched on, so that the triggering and resetting piece 54 can reduce the operation procedure of the unlocking mechanism 5, convenience is provided for the use of the unlocking mechanism 5, and the circuit breaker is more convenient and simpler to use.

In some embodiments, as shown in fig. 6, one end of the trigger release 54 is disposed on the trigger rod 51, and the other end of the trigger release 54 is connected to the housing 100; the trigger reset 54 is charged during the movement of the trigger lever 51 towards the locking member 4 to release energy to reset the trigger lever 51 when the force on the trigger lever 51 is removed.

The trigger reset 54 may be configured as a coil spring fitted over the trigger lever 51; the trigger reset 54 may also be configured as a spring.

In order to facilitate the assembly of the triggering reset piece 54, the triggering lever 51 may be provided with a limiting boss 512, the housing 100 may be provided with a limiting block 150, and the assembly of the triggering reset piece 54 between the triggering lever 51 and the housing 100 is realized by abutting two ends of the triggering reset piece 54 against the limiting block 150 and the limiting boss 512, respectively. Wherein the trigger lever 51 may be a stepped lever, as shown in fig. 7, the trigger lever 51 includes a first lever 51-1 near one side of the locking member 4, and a second lever 51-2 far from the locking member 4, a dimension of the second lever 51-2 in at least one direction perpendicular to an axis of the trigger lever 51 is larger than a dimension of the first lever 51-1 in the direction, and an end of the second lever 51-2 near the first lever 51-1 serves as a limit boss 512; of course, a separate element may be fixed to the trigger lever 51 as the limit projection 512. Thus, when the trigger lever 51 is at the initial position, the trigger reset member 54 is in a natural state; when the trigger rod 51 is forced to move towards the locking element 4, one end of the trigger reset piece 54 abutting against the limit boss 512 gradually approaches to one end abutting against the limit block 150 along with the movement of the trigger rod 51, the trigger reset piece 54 is deformed to store energy, after the trigger rod 51 triggers the locking element 4 to enable the locking element 4 to remove the limitation on the moving contact 2, the external force acting on the trigger rod 51 is removed, and the trigger reset piece 54 immediately restores the deformation; during the deformation recovery process, the trigger resetting piece 54 abuts against one end of the limit boss 512 to push the trigger rod 51 through the limit boss 512, so that the trigger rod 51 moves away from the locking piece 4, and the trigger rod 51 is reset to the initial position (as shown in fig. 6) after the trigger resetting piece 54 recovers the deformation.

To solve the above problem, in some embodiments, as shown in fig. 8 and 9, the unlocking mechanism 5 further includes a scram circuit board 55, the scram circuit board 55 is fixed on the housing 100, and the sensing device 52 is disposed on the scram circuit board 55.

The side of the emergency stop circuit board 55 may be provided with a mounting protrusion 551, and the mounting protrusion 551 may be matched with a corresponding mounting groove provided on the housing 100, so that the emergency stop circuit board 55 may be reliably mounted.

By adopting the above scheme, the sensing device 52 can be integrated on the scram circuit board 55, and the signal connection between the sensing device 52 and the scram circuit board 55 is realized through the circuit on the scram circuit board 55, so that the sensing device 52 does not need to be directly connected with the controller 6 by a lead, the connection structure of the sensing device 52 is simplified, and the reliable assembly of the sensing device 52 can be realized through the scram circuit board 55.

In some embodiments, as shown in fig. 4-6, the sensing device 52 is configured as a hall sensor, and the trigger lever 51 is provided with a magnet 53.

In this embodiment, the principle that the sensing device 52 detects the approach signal of the trigger lever 51 is realized by detecting the intensity of the magnetic field by the hall sensor. Because the scram circuit board 55 is fixed on the shell 100, the hall sensor is arranged on the scram circuit board 55, and the magnet 53 moves along with the trigger rod 51, so that the magnet 53 has relative displacement relative to the hall sensor; the closer the magnet 53 is to the hall sensor, the stronger the magnetic field of the magnet 53 sensed by the hall sensor; the farther the magnet 53 is from the hall sensor, the weaker the magnetic field of the magnet 53 is sensed by the hall sensor.

In this embodiment, as the trigger rod 51 approaches the locking member 4, the magnet 53 also approaches the hall sensor, and the magnetic field intensity detected by the hall sensor becomes stronger and stronger until the trigger rod 51 moves to the preset position (as shown in fig. 4), the magnetic field intensity also reaches a certain degree, at this time, the hall sensor is triggered to send out a signal, the controller 6 receives the signal and then controls the switch device 1 to be switched off, and no current passes through the main circuit of the circuit breaker; at this time, the locking member 4 does not release the restriction of the movable contact 2, and the movable contact 2 and the fixed contact 3 cannot be separated from each other. The hall sensor, as a common sensing device 52 for detecting a distance or a position, has the advantages of small size, light weight, long service life, convenient installation, low power, high frequency and the like, and is more suitable for the electrical equipment of the plug-in circuit breaker with the development directions of miniaturization, light weight, low energy consumption and the like.

It should be noted that, in this embodiment, the preset position may be a position on the moving path of the trigger rod 51 when the trigger rod 51 is forced to move towards the trigger rod 51 and the locking member 4 is not yet contacted; it is also possible that the trigger lever 51 is in the position when the trigger lever 51 has just contacted the locking member 4; it is also possible that the trigger rod 51 is in the position when the trigger rod 51 has contacted the locking member 4 and the trigger rod 51 starts to push the locking member 4 during the movement, but the locking member 4 is not yet caused to release the position restriction of the movable contact 2. In short, the preset position may be a position on the movement path of the trigger lever 51 at any time in the process from the moment when the trigger lever 51 is forced to move to the locking member 4 to the moment when the locking member 4 releases the restriction on the movable contact 2.

The magnetic field detected by the hall sensor in the above-described embodiment is changed in an increasing tendency. Of course, in other embodiments, the magnetic field detected by the hall sensor may also be changed in a decreasing trend, and the hall sensor may be triggered after the magnetic field is decreased to a certain extent, and then the hall sensor may transmit a signal to the controller 6 of the circuit breaker.

In some embodiments, as shown in fig. 7 and 8, the trigger rod 51 is provided with a mounting hole 511, and the magnet 53 is mounted in the mounting hole 511.

The mounting hole 511 may be a blind hole or a through hole; the mounting hole 511 may be positioned opposite the hall sensor such that the magnet 53 is closer to the hall sensor on the scram circuit board 55 and the hall sensor sensing magnet 53 is more sensitive when the trigger lever 51 is moved.

Through adopting above-mentioned scheme, magnet 53 sets up in mounting hole 511, makes things convenient for magnet 53's installation, compares with the mode that magnet 53 set up on the surface of trigger bar 51, and magnet 53 need not additionally to occupy trigger bar 51 exterior space, has not only saved circuit breaker inner space, prevents moreover that convex magnet 53 from taking place to collide with or rock at the in-process that removes and lead to droing to realize magnet 53 and trigger bar 51's reliable connection.

In some embodiments, referring to fig. 9, the end of the trigger lever 51 remote from the locking member 4 protrudes out of the housing 100 to enable the trigger lever 51 to be manually operated.

The end of the trigger lever 51 remote from the locking member 4 may be provided with an emergency stop button, which may be a separate component fixed to the end of the trigger lever 51 extending out of the housing 100, may be integrally formed with the trigger lever 51, or may be formed directly from the end of the trigger lever 51. During manual operation, the staff is direct to contact with the emergency stop button, and the area that this contact surface can design is great, reduces hand pressure, can also set up the line on the contact surface, prevents that the hand from sliding.

By adopting the above scheme, the worker can operate the trigger lever 51 by adopting the modes of manual pressing, pushing and pulling and the like, so that the unlocking mechanism 5 is conveniently operated manually.

In some embodiments, a guide channel is provided on the inner wall of the housing 100, and the trigger rod 51 is slidably disposed in the guide channel.

The guide passage is a passage provided on the movement locus of the trigger lever 51 in the process of approaching the first end 51a to the locking member 4.

Through adopting above-mentioned scheme, trigger bar 51 can use the wall of direction passageway to depend on to slide along the extending direction of direction passageway under the limiting action of the wall of direction passageway, avoid like this because the operation is not normal, lead to trigger bar 51's first end 51a movement track to take place the skew and can't accurately trigger the condition emergence of locking piece 4, and then can guarantee trigger bar 51 smooth motion steadily at release mechanism 5 during operation.

Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting 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 of the embodiments of the present application.

Claims (10)

1. A plug-in circuit breaker, comprising:

the switching device is connected in series with a main circuit of the circuit breaker;

the locking piece is movably arranged in a shell of the circuit breaker and used for limiting the position of a moving contact of the circuit breaker so as to enable the moving contact to be kept in contact with a fixed contact of the circuit breaker;

the unlocking mechanism comprises a trigger rod and a sensing device; the trigger rod is used for moving towards the locking piece under the action of force, the sensing device is used for sending a signal to a controller of the circuit breaker when detecting that the trigger rod moves to a preset position, and the controller controls the switching device to be switched off according to the signal; the trigger rod is also used for triggering the locking piece after the switch device is disconnected, so that the locking piece releases the limitation on the position of the movable contact.

2. The plug-in circuit breaker of claim 1, further comprising a breaking stopper and a breaking spring, wherein the breaking spring is disposed between the moving contact and the breaking stopper, and when the static contact is in contact with the moving contact, the breaking spring is in a compressed state and has a tendency of pushing the moving contact in a direction away from the static contact.

3. The plug-in circuit breaker of claim 1, further comprising a locking reset for resetting the locking element to a state that limits the position of the movable contact.

4. The plug-in circuit breaker according to claim 1, characterized in that the unlocking mechanism further comprises a trigger reset for resetting the trigger lever away from the locking element.

5. The plug-in circuit breaker according to claim 4, characterized in that one end of the trigger reset is arranged on the trigger lever and the other end of the trigger reset is connected with the housing; the trigger reset piece stores energy in the process that the trigger rod moves towards the locking piece, so that when the force acting on the trigger rod disappears, the energy is released to push the trigger rod to reset.

6. The plug-in circuit breaker according to claim 1, characterized in that the unlocking mechanism further comprises a scram circuit board, which is fixed on the housing, the sensor device being provided on the scram circuit board.

7. Plug-in circuit breaker according to claim 6, characterized in that the sensor device is configured as a Hall sensor, on which a magnet is arranged.

8. The plug-in circuit breaker according to claim 7, characterized in that the triggering lever is provided with a mounting hole, and the magnet is mounted in the mounting hole.

9. A plug-in circuit breaker as claimed in claim 1, characterized in that an end of the triggering lever remote from the locking member protrudes out of the housing, so that the triggering lever can be operated manually.

10. The plug-in circuit breaker according to claim 1, wherein a guide channel is provided on the inner wall of the housing, the trigger lever being slidably disposed within the guide channel.

Images