CN218039069U - Plug-in circuit breaker - Google Patents

Abstract

The embodiment of the application provides a plug-in circuit breaker, and belongs to the technical field of electrical equipment. The plug-in circuit breaker comprises a switching-on and switching-off mechanism, a locking mechanism and a breaking mechanism. The switching-on and switching-off mechanism comprises a pressing piece, a moving contact piece and a fixed contact, wherein the pressing piece is connected with the moving contact piece, the fixed contact is arranged opposite to the moving contact piece, and the pressing piece is used for being stressed to drive the moving contact piece to be in contact with or separated from the fixed contact. The locking end of the locking mechanism is used for being connected with the moving contact piece when the moving contact piece is contacted with the fixed contact so as to limit the moving contact. The disconnecting mechanism is used for moving towards the locking end along with the action of the pressing piece to push the locking end to release the limit of the locking end on the moving contact piece before the moving contact piece is separated from the fixed contact. The plug-in circuit breaker of the embodiment of the application can enable the movable contact piece to be reliably contacted with the fixed contact through the locking mechanism, and enables the movable contact piece to be quickly separated from the locking end through the disconnecting mechanism, so that the contact reliability or the separation reliability of the movable contact piece and the fixed contact is improved.

Description

Plug-in circuit breaker

Technical Field

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

Background

Circuit breakers are commonly used switching elements in electrical distribution cabinets, which are capable of switching on, carrying and breaking currents in a circuit.

A plug-in circuit breaker is a circuit breaker that is installed into or removed from a power distribution cabinet in a plug-in manner. The plug-in circuit breaker has the characteristics of small volume, convenience in extraction and quick replacement, and therefore, can be generally used.

However, in the conventional plug-in circuit breaker, the reliability of the moving contact and the fixed contact when the moving contact and the fixed contact are in contact or separated is low, so that the switching-on and switching-off state of the plug-in circuit breaker is unstable. Therefore, it is an urgent problem to provide a plug-in circuit breaker with a stable opening and closing state.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the embodiment of the application provides a plug-in circuit breaker to solve the problem that the existing plug-in circuit breaker is unstable in opening and closing state.

The embodiment of the application provides a plug-in circuit breaker. The plug-in circuit breaker comprises a switching-on and switching-off mechanism, a locking mechanism and a breaking mechanism. The switching-on and switching-off mechanism comprises a pressing piece, a moving contact piece and a fixed contact, wherein the pressing piece is connected with the moving contact piece, the fixed contact is arranged opposite to the moving contact piece, and the pressing piece is used for being stressed to drive the moving contact piece to be in contact with or separated from the fixed contact. The locking mechanism has a locking end. The locking end is used for being connected with the movable contact piece when the movable contact piece is contacted with the fixed contact so as to limit the movable contact piece. One end of the disconnecting mechanism is connected with the pressing piece, and the other end of the disconnecting mechanism faces the locking end. The disconnecting mechanism is used for moving towards the locking end along with the action of the pressing piece before the movable contact piece is separated from the fixed contact so as to push the locking end against the fixed contact and remove the limit of the movable contact piece by the locking end.

According to the plug-in circuit breaker, the switching-on and switching-off mechanism is arranged to comprise the moving contact piece, the fixed contact and the pressing piece connected with the moving contact piece, so that the pressing piece can be stressed to move and drive the moving contact piece to move towards the direction close to or far away from the fixed contact so as to be in contact with or separated from the fixed contact, and the plug-in circuit breaker is switched on or switched off; in addition, the locking mechanism is arranged, so that the locking mechanism can be connected with the movable contact piece when the movable contact piece is contacted with the fixed contact (namely, the movable contact piece is closed with the fixed contact, and the plug-in circuit breaker is switched on) so as to limit the position of the movable contact piece and enable the movable contact piece to be contacted with the fixed contact more stably; the movable contact piece and the fixed contact are still closed at the moment before the movable contact piece and the fixed contact are separated by the disconnecting mechanism, the plug-in circuit breaker is still closed, the locking mechanism is pushed against the disconnecting mechanism, the locking mechanism is quickly separated from the movable contact piece, and the movable contact piece and the fixed contact can be quickly separated. On the basis that the scheme is used, the opening and closing state of the plug-in circuit breaker of the embodiment of the application can be more stable and reliable.

In some embodiments, the pusher includes a button support and a button having a movable slot. The button support is connected with the movable contact piece, and the button is connected with the button support in a sliding mode. The disconnect mechanism includes an opening and closing member rotatably connected to the movable contact member. The first end of the opening and closing piece is positioned in the movable groove and is attached to the sliding wall of the movable groove to move along with the sliding of the button, the second end faces the locking end, and the opening and closing piece rotates along with the movement of the first end so that the second end is close to or far away from the locking end along with the different rotating directions of the opening and closing piece.

Through the scheme, the first end of the opening and closing piece can move on the sliding wall of the movable groove along with the sliding of the button on the button support, so that the opening and closing piece rotates, the second end of the opening and closing piece is close to or far away from the locking end, and the locking end is pushed or a connecting space is reserved for the locking end. Exemplarily, when the button moves towards the direction close to the movable contact piece on the button support, the first end of the opening and closing piece can be used for driving the opening and closing piece to rotate clockwise, the second end of the opening and closing piece is close to and abuts against the locking end, and the limit of the locking end on the movable contact piece is released; otherwise, when the second end of the opening and closing piece is far away from the locking end, a connecting space can be reserved for the locking end, and the locking end is convenient to be connected with the movable contact piece.

In some embodiments, the button support has a slide rail and a limiting portion, and at least a part of the button is located on the slide rail to slide in the slide rail to drive the opening and closing member to rotate. The limiting part is used for limiting the sliding distance of the button.

Through above-mentioned scheme, spacing portion can restrict the gliding distance of button towards the one end of keeping away from the movable contact spare on the button support, and then the first end of restriction opening and shutting spare is at the sliding wall on the sliding distance to and the opening and shutting spare is along anticlockwise pivoted angle, with the second end of guaranteeing the opening and shutting spare can be with locking end and movable contact spare unblock, and can reserve connection space for the locking end.

In some embodiments, the disconnect mechanism further comprises a first reset member that exerts a force on the closure member that rotates the closure member in the first direction. The first direction is the direction of the opening and closing piece rotating when the second end is far away from the locking end.

Through above-mentioned scheme, the first piece that resets can give the piece application of force of opening and shutting, makes the first end of the piece that opens and shuts slide fast to the one end that the movable contact spare was kept away from to the slide wall, and the second end orientation of the piece that opens and shuts rotates to predetermined position fast to after movable contact spare and static contact are connected, the lock can be connected with movable contact spare fast in order to realize spacing fast to movable contact spare.

In some embodiments, the locking mechanism includes a second reset piece and a locking piece having a locking end. The latch is pivotally connected to the housing of the plug-in circuit breaker. The second reset piece applies force to the locking piece to enable the locking end to rotate towards the movable contact piece so as to be connected with the movable contact piece.

Through the scheme, when the moving contact piece is contacted with the fixed contact, the second reset piece can apply force to the locking piece, so that the locking piece rotates to be connected with the moving contact piece, and the force is continuously applied to the locking piece after the locking piece is connected with the moving contact piece, so that the possibility that the locking end moves or vibrates towards the direction far away from the fixed contact is reduced, and the firmness of the contact between the moving contact piece and the fixed contact is further improved; in addition, after the movable contact piece is separated from the fixed contact, the second reset piece can also apply force to the locking piece, the possibility that the locking piece rotates freely on the shell is reduced, and therefore the locking end can be connected with the movable contact piece quickly when the movable contact piece is contacted with the fixed contact next time.

In some embodiments, the movable contact piece is provided with a limiting groove, the locking end faces a notch of the limiting groove, and when the circuit breaker is closed, the locking end enters the limiting groove along the notch and is buckled with the limiting groove to limit the movable contact piece.

Through the scheme, after the locking end is buckled with the limiting groove, acting force towards the direction of the static contact can be applied to the groove wall of the limiting groove so as to limit the moving of the movable contact piece towards the direction far away from the static contact, reduce the possibility of vibration of the movable contact piece and enable the movable contact piece to be reliably contacted with the static contact.

In some embodiments, the retaining groove includes a snap wall. The locking end is configured to be a hook-shaped structure, the concave side of the hook-shaped structure is provided with a buckling surface, and the buckling surface is close to the head of the locking end. When the locking end is buckled with the limiting groove, the buckling surface is attached to the buckling wall.

Through the scheme, the contact area between the buckling surface and the buckling wall is larger, the action area of the force applied to the movable contact piece by the locking end is larger, and the locking end is not easy to be interfered by other factors (such as vibration) and is separated from the limiting groove, so that the contact reliability of the movable contact piece and the fixed contact is further improved.

In some embodiments, the slope angle of the engaging wall is configured to be less than or equal to 90 °.

Through the scheme, the buckling wall can apply acting force perpendicular to the buckling surface, component force is generated in the opposite direction of the notch of the limiting groove, and under the action of the component force, the locking end is not easy to fall off from the limiting groove, so that the connection reliability of the locking end and the movable contact piece is further improved, and the contact reliability of the movable contact and the fixed contact is further improved.

In some embodiments, the movable contact piece includes a movable contact, a contact holder, and a first elastic member. The moving contact is connected with the contact support in a sliding mode, and the contact support is connected with the pressing piece. The moving contact is used for contacting with the static contact. The contact support is provided with a butting part on one side close to the static contact, and the first elastic part exerts a force close to the static contact on the moving contact and enables the moving contact to butt against the butting part.

Through above-mentioned scheme, the contact support can fix the moving contact to can be when the pressing member moves, along with the action drive moving contact and the contact of static contact or part of pressing member. The moving contact is connected with the contact support in a sliding mode, so that a buffering effect can be achieved when the moving contact is in contact with the fixed contact, and the moving contact is prevented from damaging the fixed contact. The first elastic element can continuously apply force to the moving contact, the possibility that the moving contact moves towards the direction far away from the static contact on the contact support is reduced, and the contact reliability of the moving contact and the static contact is improved.

In some embodiments, the movable contact piece further includes a second resilient piece. The shell of the plug-in circuit breaker is provided with a limiting boss, and the second elastic piece is connected between the contact support and the limiting boss. When the moving contact is separated from the fixed contact, the second elastic element has a force which makes the contact support far away from the fixed contact.

Through the scheme, when the moving contact is separated from the static contact, the second elastic piece can apply a force towards the direction away from the static contact to the contact support, and under the action of the force, the contact support can drive the moving contact to be separated from the static contact quickly, so that the separation efficiency of the moving contact and the static contact is improved, and the breaking efficiency of the circuit breaker is further improved.

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 a plug-in circuit breaker according to some embodiments of the present application.

Fig. 2 is an exploded view of a pressing member, a breaking mechanism, a movable contact member and a stationary contact according to some embodiments of the present application.

Fig. 3 is an assembly view of the pressing member, the breaking mechanism, the movable contact member and the stationary contact according to some embodiments of the present invention.

FIG. 4 is a schematic view of a first closure mechanism according to some embodiments of the present application.

Fig. 5 is a schematic view of the connection of the first latch mechanism to the movable contact member in some embodiments of the present application.

FIG. 6 is a schematic view of a fastening surface attached to a fastening wall according to some embodiments of the present disclosure.

FIG. 7 is a schematic view of the slope angle of the engagement wall in some embodiments of the present application.

FIG. 8 is a schematic view of a second closure mechanism according to some embodiments of the present application.

Fig. 9 is a schematic view of the connection of the second latch mechanism to the movable contact member in some embodiments of the present application.

Figure 10 is an exploded view of the movable contact piece in some embodiments of the present application.

Fig. 11 is a schematic view of the assembly of the movable contact piece with the housing in some embodiments of the present application.

Description of reference numerals:

1-switching-on and switching-off mechanism, 11-pressing piece, 111-button support, 1110-mounting groove, 1111-sliding rail, 1112-limiting part, 112-button, 1121-movable groove, C-sliding wall, 12-movable contact piece, 121-movable contact, 122-contact support, 1221-limiting groove, A-buckling wall, 1222-slot, 1223-abutting part, 123-first elastic piece, 124-second elastic piece and 13-static contact;

2-a locking mechanism, 21-a locking piece, 211-a locking end, B-a locking surface and 22-a second resetting piece;

3-a disconnecting mechanism, 31-an opening and closing piece, 32-a first resetting piece;

4-shell, 41-spacing boss;

x-a first direction.

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 in the description of the figures are intended to cover, but not exclude, other things. The word "a" or "an" does not exclude a plurality.

The appearances of the phrase "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 may be combined with other embodiments.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. For example, in the description of the present application, the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate the description of the application and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the application.

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, it should be noted that unless otherwise explicitly stated 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, and "connected" or "connected" of a circuit structure may refer to an electrical connection or a signal connection in addition to a physical connection, as long as the circuit is connected; the signal connection may be a signal connection through a medium other than a circuit. 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.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

According to some of its embodiments, the present application provides a plug-in circuit breaker. Referring to fig. 1, fig. 1 is a schematic structural diagram of a plug-in circuit breaker according to some embodiments of the present disclosure. As shown in fig. 1, the plug-in type circuit breaker includes a switching mechanism 1, a latch mechanism 2, and a breaking mechanism 3. The switching-on/off mechanism 1 comprises a pressing piece 11, a moving contact piece 12 and a fixed contact 13, wherein the pressing piece 11 is connected with the moving contact piece 12, the fixed contact 13 is arranged opposite to the moving contact piece 12, and the pressing piece 11 is used for being stressed to drive the moving contact piece 12 to be in contact with or separate from the fixed contact 13. The locking mechanism 2 has a locking end 211; the locking end 211 is used for connecting with the moving contact piece 12 to limit the moving contact piece 12 when the moving contact piece 12 contacts with the fixed contact 13 (i.e. the moving contact piece 12 and the fixed contact 13 are closed). The breaking mechanism 3 has one end connected to the pressing piece 11 and the other end facing the locking end 211. The disconnecting mechanism 3 is configured to, before the movable contact piece 12 is separated from the fixed contact 13, close the movable contact piece 12 and the fixed contact 13 at this time, move toward the locking end 211 along with the action of the pressing piece 11 to push the locking end 211, and release the limit of the locking end 211 on the movable contact piece 12.

The switching-on/off mechanism 1 is a mechanism for realizing switching-on or switching-off in an insertion type circuit breaker. When the plug-in circuit breaker is switched on, an internal main loop is conducted, and a distribution circuit using the plug-in circuit breaker is conducted. When the plug-in circuit breaker is opened, the internal main loop is disconnected, and the distribution circuit using the plug-in circuit breaker is disconnected.

The pressing member 11 is a member for being forced to move the moving contact member 12 into and out of contact with the stationary contact 13. The pressing member 11 may be a single body or a combined body. When the pressing member 11 is an assembly, it may include a first part and a second part slidably connected, the first part may drive the first member to rotate, and the second part may drive the second member to move linearly. The pressing member 11 may be made of an insulating material (e.g., rubber, polyethylene, etc.), so that the possibility of electrical connection between the pressing member 11 and other charged components (e.g., a circuit board) and the possibility of a safety accident due to power connection of the force applying body may be reduced.

One end of the pressing piece 11 may be exposed to a case of the plug-in type circuit breaker so that the force applying body applies force to the pressing piece 11, and the other end may be adjacent to the movable contact piece 12 to push the movable contact piece 12. The pressing piece 11 may be provided in an elongated shape extending toward the movable contact piece 12, so that as long as the force application body applies a force in the lengthwise direction of the pressing piece 11, the force can be transmitted to the movable contact piece 12 through the pressing piece 11, the force transmission manner is simpler, and the loss of the force is smaller. The urging body for urging the pressing tool 11 may be a human being or an external device.

The pressing member 11 may move toward a direction approaching or moving away from the movable contact member 12, and the specific moving direction is different according to the specific opening or closing process of the plug-in circuit breaker. For example, when the force application body applies a force to the pressing piece 11 toward the movable contact piece 12, the pressing piece 11 moves in a direction approaching the movable contact piece 12; in contrast, when the force applying body applies a force to the pressing piece 11 away from the movable contact piece 12, the pressing piece 11 may move toward a direction away from the movable contact piece 12.

The pressing piece 11 and the movable contact piece 12 can be connected in a movable or fixed way. In some embodiments, when the pressing member 11 is integrally formed, the pressing member 11 may be movably connected to the movable contact member 12, and specifically, a kidney-shaped hole extending toward the movable contact member 12 may be formed in the pressing member 11, a connection hole may be formed at an end of the movable contact member 12 close to the pressing member 11, and a U-shaped rod having one end located in the kidney-shaped hole and the other end fixed to the connection hole may be disposed between the pressing member 11 and the movable contact member 12, so that when the pressing member 11 is operated, other components (such as the disconnecting mechanism 3) may be operated, and then the movable contact member 12 is driven to approach or separate from the fixed contact 13 by the U-shaped rod. In other embodiments, when the pressing member 11 is provided as a combined member, the first part can actuate other components (such as the disconnecting mechanism 3) first, and then actuate the second part, and together with the second part, actuate the movable contact member 12 to approach or move away from the stationary contact 13.

The movable contact piece 12 is a member that comes into contact with or separates from the stationary contact 13 in accordance with the operation of the pressing piece 11. The movable contact member 12 may also be provided as a unitary or composite piece. When the movable contact piece 12 is provided as one body, the movable contact piece 12 can be moved closer to or away from the stationary contact 13 directly with the movement of the pressing piece 11. When the moving contact piece 12 is set as an assembly, the moving contact piece 12 can be formed by assembling two slidably connected parts, the two parts can be close to or far from the fixed contact 13 together with the action of the pressing piece 11, and one of the parts can be in contact with the fixed contact 13 and move in a short distance in a direction far from the fixed contact 13 on the other part at the moment of being in contact with the fixed contact 13, so that a buffering effect is achieved, and the possibility that the fixed contact 13 is damaged by the part in contact with the fixed contact 13 is reduced. At least a portion of the movable contact piece 12 may be made of an electrically conductive material, so that the movable contact piece 12 may participate in power distribution as a part of a main circuit in the plug-in circuit breaker when contacting the stationary contact 13.

The stationary contact 13 is a part that is brought into contact with the movable contact piece 12 to make the main circuit of the plug-in type circuit breaker conductive, or is separated from the movable contact piece 12 to break the main circuit of the plug-in type circuit breaker. The stationary contact 13 may be fixed to the housing of the plug-in circuit breaker. The stationary contact 13 is also made of a conductive material, so that the main circuit of the plug-in circuit breaker can be conducted when the stationary contact 13 contacts the movable contact piece 12.

The movable contact piece 12 and the fixed contact 13 are arranged oppositely, that is, at least one part of the movable contact piece 12 is located at a position opposite to the fixed contact 13 in the linear direction without being blocked by other parts, so that when the movable contact piece 12 moves, the part can move in the linear direction to be in contact with the fixed contact 13, and the plug-in circuit breaker is switched on. It should be noted that: the part of the moving contact piece 12 contacting the fixed contact 13 and the surface of the fixed contact 13 facing the part can be set to be flat surfaces, so that when the moving contact piece 12 contacts the fixed contact 13, the contact area between the moving contact piece and the fixed contact is increased, and the contact stability between the moving contact piece and the fixed contact is improved.

The locking mechanism 2 is connected with the moving contact piece 12 to limit the moving contact piece 12 when the moving contact piece 12 contacts with the static contact 13. The latch mechanism 2 may be provided as a combination comprising a plurality of parts, for example, a force applying part and a connecting part, and the force applying part may apply a force to the connecting part to connect the connecting part with the movable contact member 12. The locking mechanism 2 may be made of an insulating material to reduce the possibility of the movable contact piece 12 electrically connecting with other conductive parts when connected with the movable contact piece 12.

The locking end 211 is an end for connection with the movable contact piece 12. The connection mode of the locking end 211 and the movable contact piece 12 can be butt joint, insertion connection or buckling. For example, at least a portion of the locking end 211 may abut against a sidewall of the movable contact piece 12 on a side away from the fixed contact 13, may be inserted into a slot provided on the movable contact piece 12, and may be locked with a limiting groove provided on the movable contact piece 12. After the locking end 211 is connected to the moving contact piece 12, a force toward the fixed contact 13 may be applied to the moving contact piece 12 to limit the moving or vibrating of the moving contact piece 12 toward a direction away from the fixed contact piece 13, thereby improving the reliability of the contact between the moving contact piece 12 and the fixed contact 13.

The disconnecting mechanism 3 is a mechanism for separating the locking mechanism 2 from the movable contact piece 12 in accordance with the action of the pressing piece 11 before the movable contact piece 12 is separated from the fixed contact 13. The disconnecting mechanism 3 may include a rod-like structure to push against the locking end 211, so that the connection relationship between the locking end 211 and the movable contact piece 12 is released; a hook-shaped structure can be further included to hook the locking end 211, so that the locking end 211 moves or rotates to release the connection relationship between the locking end 211 and the movable contact piece 12; wherein, the rod-shaped structure can be a cylindrical rod or a rectangular rod extending towards the locking end 211; the hook-shaped structure can comprise a first part and a second part which are connected, and an included angle is formed between the first part and the second part. The opening mechanism 3 may be made of an insulating material, so that when the locking end 211 is made of a conductive material and the opening mechanism 3 is pushed or hooked against the locking end 211, the possibility of electrical connection between the locking end 211 and other conductive components can be reduced.

The connection mode of the disconnecting mechanism 3 and the pressing piece 11 can be a movable connection or a fixed connection, and the present application is not limited thereto, as long as the pressing piece 11 can drive the disconnecting mechanism 3 to act and drive the locking end 211 to be disconnected from the movable contact piece 12 when the disconnecting mechanism 3 acts. For example, when the locking end 211 is inserted or fastened with the moving contact piece 12, a movable groove may be disposed on the pressing piece 11, and a protrusion located in the movable groove is disposed at one end of the disconnecting mechanism 3, so that when the pressing piece 11 is forced, the groove wall of the movable groove may drive the disconnecting mechanism 3 to rotate, and push against the locking end 211, so as to disconnect the locking end 211 from the moving contact piece 12.

According to the technical scheme of the embodiment of the application, the switching-on and switching-off mechanism 1 of the plug-in circuit breaker is arranged to comprise a movable contact piece 12, a fixed contact 13 and a pressing piece 11 connected with the movable contact piece 12, so that the pressing piece 11 can be stressed to move and drive the movable contact piece 12 to move towards the direction close to or far away from the fixed contact 13 so as to be in contact with or separated from the fixed contact 13, and the plug-in circuit breaker is switched on or switched off; in addition, by arranging the locking mechanism 2, when the movable contact piece 12 is contacted with the fixed contact 13 (namely, the movable contact piece 12 is closed with the fixed contact 13, and the plug-in circuit breaker is switched on), the locking mechanism 2 can be connected with the movable contact piece 12 to limit the position of the movable contact piece 12, reduce the possibility that the movable contact piece 12 moves or vibrates towards the direction far away from the fixed contact 13, and make the contact between the movable contact piece 12 and the fixed contact 13 more stable; the disconnecting mechanism 3 is also arranged, so that the disconnecting mechanism 3 can make the moving contact piece 12 and the fixed contact 13 still closed before the moving contact piece 12 and the fixed contact 13 are separated, the plug-in circuit breaker still closes, the locking mechanism 2 is pushed against, the locking mechanism 2 is quickly separated from the moving contact piece 12, and further the moving contact piece 12 is quickly separated from the fixed contact 13. On the basis of the scheme, the opening and closing state of the plug-in circuit breaker of the embodiment of the application can be more stable and reliable.

According to other embodiments of the present application, fig. 2 is an exploded view of the pressing piece 11, the disconnecting mechanism 3, the moving contact piece 12 and the stationary contact 13 according to some embodiments of the present application; fig. 3 is an assembly view of the pressing piece 11, the disconnecting mechanism 3, the movable contact piece 12 and the stationary contact 13 according to some embodiments of the present application. As shown in fig. 2 and 3, the pressing member 11 includes a button holder 111 and a button 112 having a movable groove 1121, and the button 112 is slidably coupled to the button holder 111; the button holder 111 is connected to the movable contact piece 12; the opening mechanism 3 includes an opening member 31 rotatably connected to the movable contact member 12, a first end of the opening member 31 is located in the movable slot 1121 and moves along with the sliding of the button 112 and abuts against the sliding wall C of the movable slot 1121, a second end faces the locking end 211, and the opening member 31 rotates along with the movement of the first end, so that the second end is close to or away from the locking end 211 along with the different rotating directions of the opening member 31.

The button 112 is a member for receiving a force to rotate the opening and closing member 31, and is a member for moving the button holder 111 toward the movable contact member 12. The button holder 111 is a member for mounting the button 112, and is also a member which moves together with the button 112 and moves the movable contact piece 12 closer to or away from the stationary contact 13.

By connecting the button 112 with the button support 111 in a sliding manner and connecting the button support 111 with the moving contact piece 12, after the button 112 and the button support 111 move synchronously to drive the moving contact piece 12 to contact with the fixed contact 13, the button support 111 can also slide, and the other end of the disconnecting mechanism 3 is driven to be far away from the locking end 211, so that the locking end 211 is conveniently connected with the moving contact piece 12; or, the button 112 may slide on the button holder 111, and drive the other end of the disconnecting mechanism 3 to approach and push the locking end 211 without driving the button holder 111 to move, so as to disconnect the locking end 211 from the movable contact 12, or may move synchronously with the button holder 111 after the locking end 211 is disconnected from the movable contact 12, so as to drive the movable contact 12 to be separated from the fixed contact 13 when the button holder 111 moves. Wherein, the sliding connection can have a plurality of connection modes; for example, a mounting groove 1110 is provided on the button holder 111, and at least a portion of the button 112 is disposed in the mounting groove 1110. The button holder 111 may be connected to the movable contact member 12 directly or via the aforementioned U-shaped rod, which will not be described herein.

At least a portion of the button 112 may be exposed to the housing of the plug-in circuit breaker such that the force applying body applies a force to the button 112 without opening the housing or entering the housing interior, so that the button 112 slides on the button holder 111 to rotate the breaking mechanism 3 or to move the button holder 111 towards the movable contact piece 12.

The opening member 31 is a member for releasing the connection of the lock mechanism 2 and the movable contact member 12. The opening element 31 is rotatably connected to the movable contact member 12 and rotates on the movable contact member 12 as the button 112 slides on the button holder 111 to approach and push the latching end 211 to separate the latching end 211 from the movable contact member 12 or to move away from the latching end 211 to facilitate the connection of the latching end 211 with the movable contact member 12. When the button holder 111 is rotatably connected to the moving contact member 12, a fixing shaft may be provided on the moving contact member 12, and a fixing hole may be provided in the opening member 31 to rotatably connect the opening member 31 to the moving contact member 12 through the fixing hole. The opening and closing member 31 may also be made of an insulating material to reduce the possibility of electrical connection of the movable contact piece 12 with other live parts.

With reference to fig. 2 and fig. 3, when the first end of the opening element 31 is connected to the button 112, the movable groove 1121 may be disposed on the button 112, and the protrusion may be disposed on the first end of the opening element 31. The protrusion extends into the slot from the notch of the movable slot 1121, the movable slot 1121 has at least one inner side wall located between the protrusion and the fixing hole, the inner side wall can be configured as a sliding wall C, the protrusion abuts against the sliding wall C, the sliding wall C can extend from a side away from the movable contact piece 12 to a side close to the movable contact piece 12, and an included angle can be set between the extending direction of the sliding wall C and the moving direction of the button 112, so that the protrusion at the first end of the opening element 31 can slide along the sliding wall C along with the movement of the button 112, and when the button 112 acts, the opening element 31 can rotate by abutting against the protrusion at different positions of the sliding wall C. When the second end of the opening and closing member 31 abuts against the locking end 211, a protruding handle protruding toward the locking end 211 may be disposed at the second end, so that the locking end 211 abuts against the locking end 211, and the connection relationship between the locking end 211 and the movable contact member 12 is released.

To facilitate understanding of the process of the button 112 rotating the opening element 31, the following description is made in detail with reference to fig. 2 and 3.

As shown in fig. 2 and 3, when the button 112 moves on the button holder 111 in a direction away from the movable contact piece 12, the button 112 drives the first end of the opening-closing member 31 to slide from the end of the sliding wall C away from the movable contact piece 12 to the end close to the movable contact piece 12, and drives the opening-closing member 31 to rotate clockwise, so that the second end of the opening-closing member 31 moves toward the locking end 211 to release the connection between the locking end 211 and the movable contact piece 12. On the contrary, when the button 112 moves on the button holder 111 in a direction approaching the movable contact member 12, the first end of the opening-closing member 31 has a possibility to slide toward the lower end (the end far from the movable contact member 12 in the drawing) of the sliding wall C under the action of gravity, so that the opening-closing member 31 is rotated counterclockwise, and the second end of the opening-closing member 31 is moved in a direction far from the locking end 211, to reserve a connection space for the locking end 211 to be connected to the movable contact member 12. The connection space is a space occupied by the locking end 211 when connected to the movable contact member 12, at a portion near the movable contact member 12 or on the movable contact member 12.

In the technical solution of the embodiment of the present application, the first end of the opening and closing member 31 can move along with the sliding of the button 112 on the button holder 111 to fit the sliding wall C, so that the opening and closing member 31 rotates clockwise or counterclockwise, the second end of the opening and closing member 31 is close to or away from the locking end 211, and the locking end 211 is separated from the movable contact piece 12 or a connection space is reserved for the locking end 211.

According to other embodiments of the present application, please refer to fig. 2, the button bracket 111 has a sliding rail 1111 and a position-limiting portion 1112, and at least a portion of the button 112 is located on the sliding rail 1111 to slide in the sliding rail 1111 to drive the opening/closing member 31 to rotate. The stopper 1112 is used to limit the sliding distance of the button 112.

The slide 1111 is a rail for facilitating the sliding of the button 112 on the button holder 111. As shown in fig. 3, the sliding rails 1111 may be disposed at both sides of the button holder 111 in parallel with an extending direction of the button holder 111 toward the movable contact member 12. The surface of the sliding rail 1111 contacting the button 112 may be a smooth plane, so that the friction between the button 112 and the sliding rail 1111 may be reduced, and the button 112 may slide on the button holder 111 more easily. When at least a portion of the button 112 is located on the sliding rail 1111, protrusions extending to the sliding rail 1111 may be disposed on both sides of the button 112, so that the button 112 may be slidably coupled to the button holder 111 through the protrusions.

The stopper 1112 is configured to limit a sliding distance of the push button 112 on the button holder 111. As shown in fig. 3, the stopper 1112 may be a flange provided at an end of the slide 1111 remote from the movable contact member 12.

Based on the above statement, since the button 112 can rotate the opening and closing member 31 when sliding on the button holder 111, and reserves a connection space for the locking end 211 through the second end, the distance of sliding the button 112 on the button holder 111 can affect the rotation angle of the opening and closing member 31, and further affect the size of the connection space, so the position of the position-limiting portion 1112 can be set according to the angle of rotation required by the opening and closing member 31 when the second end of the opening and closing member 31 just reserves the connection space for the locking end 211; for example, the length of the sliding wall C may be set according to the angle of the opening and closing member 31 that needs to be rotated, the stroke of the button 112 that needs to be slid in the direction away from the movable contact member 12 may be set according to the length of the sliding wall C, and the position of the stopper 1112 may be set according to the stroke of the button 112.

In the technical solution of the embodiment of the present application, the distance that the button 112 slides towards the end far away from the movable contact piece 12 on the button support 111 can be limited by the limiting portion 1112, and then the sliding distance of the first end of the opening and closing member 31 on the sliding wall C and the angle of the opening and closing member 31 rotating in the counterclockwise direction are limited, so as to ensure that the second end of the opening and closing member 31 can unlock the locking end 211 and the movable contact piece 12 and reserve a connection space for the locking end 211.

According to other embodiments of the present application, as shown in fig. 2 and 3, the disconnecting mechanism 3 further includes a first restoring member 32, and the first restoring member 32 applies a force to the opening and closing member 31 to rotate the opening and closing member 31 in the first direction X. The first direction X is the direction of rotation of the opening and closing member 31 when the second end is far away from the locking end 211.

The first returning member 32 is a member for sliding the opening-closing member 31 from the end of the sliding wall C close to the movable contact member 12 to the end distant from the movable contact member 12.

The first restoring member 32 may be a torsion spring. The first reset member 32 can be sleeved on the fixed shaft of the moving contact member 12, one end of the first reset member 32 can abut against a reset protrusion arranged on the moving contact member 12, wherein the reset protrusion can be arranged on one side of the moving contact member 12 away from the pressing member 11, and the other end can abut against a side wall of the opening and closing member 31 away from the locking end 211, so as to apply force to the opening and closing member 31, so that the opening and closing member 31 can rotate along a first direction X, specifically, the first direction X can be a counterclockwise direction.

During the process of the button 112 moving toward the direction approaching the movable contact piece 12 on the button holder 111, other walls of the movable slot 1121 (e.g., the wall approaching the button holder 111, the wall far from the movable contact piece 12) may not contact the first end of the opening-closing piece 31, at this time, if the weight of the first end of the opening-closing piece 31 is smaller than that of the second end, the possibility that the first end of the opening-closing piece 31 slides to the end far from the movable contact piece 12 along the end of the sliding wall C near the movable contact piece 12 under the action of gravity is lower, so that the force can be applied to the opening-closing piece 31 through the other end of the first reset piece 32, so that the first end of the opening-closing piece 31 can slide to the end of the sliding wall C far from the movable contact piece 12, and the second end can rotate toward the direction far from the locking end 211, so as to reserve a connection space for the locking end 211 quickly.

In the technical solution of the embodiment of the present application, the first resetting element 32 applies a force to the opening and closing element 31, so that the first end of the opening and closing element 32 can slide to the end of the sliding wall C away from the moving contact element 12 quickly, and the second end of the opening and closing element 31 rotates to a predetermined position quickly in the direction away from the locking end 211, so that after the moving contact element 12 is connected with the fixed contact 13, the locking end 211 can be connected with the moving contact element 12 quickly, so as to realize quick limiting of the moving contact element 12.

According to other embodiments of the present application, please refer to fig. 4, fig. 4 is a schematic view of a first locking mechanism 2 according to some embodiments of the present application, and as shown in fig. 4, the locking mechanism 2 includes a second restoring member 22 and a locking element 21 having a locking end 211. The latch 21 is rotatably coupled to a housing of the plug-in type circuit breaker. The second restoring member 22 applies a force to the latching member 21 to rotate the latching end 211 toward the movable contact member 12 to connect with the movable contact member 12.

The locking member 21 is a member for connecting with the movable contact piece 12. The locking element 21 may be provided in a variety of configurations. The locking end 211 may be disposed at either end of the locking element 21. The locking element 21 may be made of an insulating material or may be made of a conductive material. When the latch 21 is made of an insulating material, it is possible to reduce the possibility of electrical connection of the movable contact piece 12 with other components when it is connected to the movable contact piece 12.

When the locking member 21 is rotatably coupled to the case of the plug-in type circuit breaker, for example, a rotating shaft may be provided on the case, a through hole may be provided on the locking member 21, and the locking member 21 may be rotatably coupled to the rotating shaft through the through hole.

The second restoring member 22 is a member for urging the locking member 21 to connect the locking end 211 with the movable contact member 12. The second reset element 22 may be connected between the locking element 21 and the housing, or between the locking element 21 and other fixed components in the circuit breaker. The second restoring member 22 may be a torsion spring; the second reset element 22 may be fixed to the housing, and one end of the second reset element may be fixed to the housing or abutted against the housing, and the other end of the second reset element may be abutted against any position of the locking element 21 where the radius of rotation is larger than zero, so as to apply a force to the locking element 21 to rotate the locking end 211 towards the movable contact element 12 to connect with the movable contact element 12.

In the technical solution of the embodiment of the present application, when the moving contact piece 12 contacts the static contact 13, the second resetting piece 22 can apply a force to the locking piece 21, so that the locking piece 21 rotates to be connected with the moving contact piece 12, and the locking piece 12 is continuously applied with a force after the locking piece 21 is connected with the moving contact piece 12, thereby reducing the possibility that the locking end 211 moves or vibrates in a direction away from the static contact 13, and further improving the firmness of the contact between the moving contact piece 12 and the static contact 13; in addition, after the movable contact piece 12 is separated from the fixed contact 13, the second reset piece 22 can apply force to the locking piece 21, so that the possibility that the locking piece 21 rotates freely on the shell is reduced, and the locking end 211 can be quickly connected with the movable contact piece 12 when the movable contact piece 12 is contacted with the fixed contact 13 next time.

According to other embodiments of the present application, please refer to fig. 5, fig. 5 is a schematic view of the connection of the first latch mechanism 2 with the movable contact member 12 according to some embodiments of the present application. As shown in fig. 5, the movable contact piece 12 is provided with a limiting groove 1221, the locking end 211 faces the notch of the limiting groove 1221, and when the circuit breaker is closed, the locking end 211 enters the limiting groove 1221 along the notch and is fastened with the limiting groove 1221 to limit the movable contact piece 12.

The retaining groove 1221 is a groove that is engaged with the locking end 211 to connect the movable contact piece 12 with the locking piece 21. The extending direction of the limiting groove 1221 may be substantially perpendicular to the connecting line direction of the moving contact piece 12 and the fixed contact 13, and the substantially perpendicular direction means that an included angle between the extending direction of the limiting groove 1221 and the connecting line direction of the moving contact piece 12 and the fixed contact 13 is between 80 ° and 100 °. The notch of the locking end 211 facing the limiting groove 1221 refers to the opening of the limiting groove 1221 near the locking end 211.

It should be noted that, along the connecting line direction between the moving contact piece 12 and the fixed contact 13, the size of the limiting groove 1221 may be larger than the size of the locking end 211, so that the second end of the opening and closing piece 31 may rotate in the limiting groove 1221, and the locking end 211 is pushed out of the limiting groove 1221.

In the technical solution of the embodiment of the present application, after the locking end 211 is fastened to the limiting groove 1221, an acting force in a direction toward the fixed contact 13 may be applied to a groove wall of the limiting groove 1221, so as to limit movement of the movable contact piece 12 in a direction away from the fixed contact 13, reduce a possibility of vibration of the movable contact piece 12, and enable the movable contact piece 12 to reliably contact with the fixed contact 13.

According to other embodiments of the present application, please continue to refer to fig. 6, in which fig. 6 is a schematic view illustrating a fastening surface B and a fastening wall a of a fastening device according to some embodiments of the present application. As shown in fig. 6, the retaining groove 1221 includes a snap wall a. The locking end 211 is configured as a hook-shaped structure, the concave side of the hook-shaped structure has a fastening surface B, and the fastening surface B is close to the head of the locking end 211. When the locking end 211 is locked with the limiting groove 1221, the locking surface B is attached to the locking wall a.

The engaging wall a may be a wall of the limiting groove 1221 close to the fixed contact 13. The fastening surface B may be a surface for fitting to the fastening wall a.

When the fastening wall a is attached to the fastening surface B, in some embodiments, both the fastening wall a and the fastening surface B may be configured to have a certain roughness, so that the fastening area of the fastening surface B and the fastening wall a is increased, and meanwhile, the friction force between the fastening wall a and the fastening wall B is increased, so that the locking end 211 is not easily separated from the limiting groove 1221; in other embodiments, the fastening wall a may have a limiting protrusion, and the fastening surface B may have a limiting groove adapted to the limiting protrusion, so that when the fastening surface B is attached to the fastening wall a, the limiting protrusion may be inserted into the limiting groove to limit the fastening end 211, thereby reducing the possibility of the fastening end 211 being separated from the limiting groove 1221.

In the technical scheme of this application embodiment, through setting up buckling face B and lock wall a to the laminating, can make the area of contact between the two bigger, the effect area of power that locking end 211 applyed for movable contact spare 12 is bigger, makes locking end 211 be difficult for receiving the interference of other factors (for example, vibrations) and deviate from spacing groove 1221, and then improves the reliability that movable contact spare 12 and static contact 13 contacted.

According to other embodiments of the present application, please refer to fig. 7, fig. 7 is a schematic view of the slope angle α of the fastening wall a according to some embodiments of the present application. As shown in fig. 10, the slope angle α of the engaging wall a is configured to be less than or equal to 90 °.

The slope angle α is the angle between the side wall of the movable contact piece 12 close to the locking piece 21 and the fastening wall a.

When the slope angle of the fastening wall a is greater than 90 °, the fastening wall a applies a force perpendicular to the fastening surface B, and generates a component force having the same direction as the notch of the limiting groove 1221, and under the action of the component force, the fastening surface B slides out of the limiting groove 1221 along the fastening wall a more easily, so that the locking end 211 is disconnected from the movable contact piece 12, which is not beneficial to the limitation of the locking end 211 on the movable contact piece 12.

In the technical solution of the embodiment of the present application, the slope angle α of the fastening wall a is configured to be less than or equal to 90 °, so that the fastening wall a applies an acting force perpendicular to the fastening surface B, and generates a component force opposite to the notch direction of the limiting groove 1221, under the action of the component force, the locking end 211 is less likely to be separated from the limiting groove 1221, the connection between the movable contact piece 12 and the locking end 211 is more reliable, and further, the contact between the movable contact piece 12 and the stationary contact 13 is more reliable.

It should be noted that the slope angle α of the fastening wall a may also be configured to be between 80 ° and 90 °, so that when the movable contact piece 12 contacts the stationary contact 13, the locking end 211 is not easily separated from the limiting groove 1221, and before the movable contact piece 12 is separated from the stationary contact 13, the locking end 211 is easily separated from the limiting groove 1221.

In other embodiments, please refer to fig. 8 and 9, fig. 8 is a schematic view of the second type of latch mechanism 2 according to some embodiments of the present application, and fig. 9 is a schematic view of the connection between the second type of latch mechanism 2 and the movable contact member 12 according to some embodiments of the present application. As shown in fig. 8, the locking mechanism 2 comprises a linear locking element 21 and a linear second resetting element 22. As shown in fig. 9, the moving contact member 12 is provided with a slot 1222, the housing is provided with a linear sliding groove with an opening facing the slot 1222, the locking member 21 is arranged in a linear structure and installed in the sliding groove, the second reset member 22 is arranged in a cylindrical spring, one end of the second reset member 22 abuts against the housing 4, and the other end abuts against one end of the locking member 21 away from the locking end 211. When the circuit breaker is closed, the locking end 211 enters the slot 1222 along the notch to be inserted into the slot 1222, so as to limit the moving contact piece 12.

In the technical solution of the embodiment of the present application, after the locking end 211 is inserted into the slot 1222, an acting force in a direction toward the fixed contact 13 may be applied to a slot wall of the slot 1222 near one side of the fixed contact 13 to limit movement of the movable contact piece 12 in a direction away from the fixed contact 13, and reduce a possibility of vibration of the movable contact piece 12, so that the movable contact piece 12 can reliably contact with the fixed contact 13. In addition, the locking piece 21 is arranged in a straight-line structure, so that the structure of the locking piece 21 is simpler, and the processing and manufacturing of the locking piece 21 are more convenient.

Referring to fig. 10, according to other embodiments of the present application, fig. 10 is an exploded view of the movable contact member 12 in accordance with some embodiments of the present application. As shown in fig. 10, the movable contact member 12 includes a movable contact 121, a contact support 122 and a first elastic member 123, the movable contact 121 is slidably connected to the contact support 122, and the contact support 122 is connected to the pressing member 11; the moving contact 121 is used for contacting with the fixed contact 13; an abutting portion 1223 is disposed on a side of the contact support 122 close to the fixed contact 13, and the first elastic element 123 applies a force close to the fixed contact 13 to the movable contact 121, so that the movable contact 121 abuts against the abutting portion 1223.

The movable contact 121 is a member that contacts the stationary contact 13. The movable contact 121 may be a plate-shaped structure, an L-shaped structure, or a zigzag structure.

The contact holder 122 is a member for fixing the movable contact 121 and is also a member for connecting to the pressing member 11. The contact carrier 122 may be provided in a rectangular parallelepiped configuration.

When the contact holder 122 is connected to the pressing member 11, the contact holder 122 may be connected to the button holder 111 in the same manner as the button holder 111 is connected to the movable contact member 12, and the details are not described herein. After the contact holder 122 is connected to the button holder 111, it can move toward or away from the fixed contact 13 along with the movement of the button holder 111.

When the movable contact 121 is slidably connected to the contact holder 122, for example, a connection groove adapted to the shape of the movable contact 121 may be provided on the contact holder 122, so that the movable contact 121 is fastened to the contact holder 122. Further, the surface of the movable contact 121 slidably connected to the contact support 122 may be a smooth plane, so that the friction between the movable contact 121 and the contact support 122 may be reduced, and the sliding of the movable contact 12 on the contact support 122 may be smoother. After the movable contact 121 is slidably connected to the contact support 122, the movable contact 121 may move on the contact support 122 toward a direction approaching or moving away from the fixed contact 13, or move together with the contact support 122 toward a direction approaching or moving away from the fixed contact 13. In the process that the pressing member 11 applies force to the moving contact member 12 to contact the moving contact 121 with the fixed contact 13, at the moment that the moving contact member 121 contacts the fixed contact 13, the moving contact 121 can move a small distance on the contact support 122 in the direction away from the fixed contact 13, so as to play a role in buffering, and reduce the possibility that the moving contact 121 damages the fixed contact 13.

The abutting portion 1223 is a member for restraining the movable contact 121. The abutting portion 1223 is used to limit a sliding distance of the movable contact 121 toward the fixed contact 13 on the contact support 122, so as to reduce a possibility that the movable contact 121 slides out of the contact support 122 and a possibility that the movable contact 121 applies an excessive force to the fixed contact 13 to damage the fixed contact 13.

The first elastic member 123 is a member for applying a force to the movable contact 121 when the movable contact 121 moves in a direction away from the stationary contact 13, so that the movable contact 121 can be again in contact with the stationary contact 13, and continuously applying a force to the movable contact 121 after the movable contact 121 is in contact with the stationary contact 13, so that the movable contact 121 and the stationary contact 13 are always in a stable and reliable contact state.

The first elastic member 123 may be a torsion spring or a cylindrical spring. In some embodiments, when the first elastic element 123 is a torsion spring, it can be fixed on the fixed shaft of the moving contact element 12 and fixed or abutted on the contact support 122 at one end and abutted on the side of the moving contact 121 facing the pressing element 11 at the other end. Further, a contact groove may be disposed on one side of the movable contact 121 facing the pressing member 11, so that the other end of the first elastic member 123 may contact the contact groove, thereby reducing the possibility of the other end sliding on the movable contact 121 and ensuring the stability of the force applied by the other end to the movable contact 121. In other embodiments, when the first elastic element 123 is a cylindrical spring, one end of the first elastic element 123 may be abutted against the housing along a connection line between the movable contact 121 and the fixed contact 13, and the other end of the first elastic element 123 may be abutted against the movable contact 121, so as to apply a force to the movable contact 121.

In the technical solution of the embodiment of the application, the contact support 122 can fix the moving contact 121, and can drive the moving contact 121 to contact or separate from the static contact 13 along with the movement of the pressing piece 11 when the pressing piece 11 moves; the moving contact 121 is connected with the contact support 122 in a sliding manner, so that when the moving contact 121 is in contact with the fixed contact 13, a buffering effect is achieved, and the moving contact 121 is prevented from damaging the fixed contact 13; the first elastic element 123 can continuously apply force to the movable contact 121, so that the possibility that the movable contact 121 moves on the contact support 122 in a direction away from the fixed contact 13 is reduced, and the contact reliability of the movable contact 121 and the fixed contact 13 is improved.

With continuing reference to fig. 10 and with further reference to fig. 11, in accordance with further embodiments of the present application, fig. 11 is a schematic view of the assembly of the movable contact member 12 with the housing 4 in accordance with some embodiments of the present application. As shown in fig. 10 and 11, the movable contact piece 12 further includes a second elastic piece 124, the case 4 of the plug-in circuit breaker has a limit boss 41, and the second elastic piece 124 is connected between the contact holder 122 and the limit boss 41; the second elastic member 124 has a force to move the contact holder 122 away from the stationary contact 13.

The second elastic member 124 is a member for rapidly separating the moving contact 121 from the stationary contact 13. The second elastic member 124 may be configured as a cylindrical spring, one end of which may be connected to the limiting boss 41, and the other end of which may be connected to the contact holder 122; in specific connection, a first blind hole may be formed on the limiting boss 41, a second blind hole may be formed on the contact holder 122, and two ends of the second elastic member 124 may be respectively connected to the first blind hole and the second blind hole. The connection manner can reduce the possibility that the second elastic element 124 slides on the limiting boss 41 and the contact support 122, ensure the reliability of the second elastic element 124 applying force to the contact support 122, and can also play a role in guiding the second connecting element 124 through the first blind hole and the second blind hole, so that the direction of the force applied by the second elastic element 124 to the contact support 122 is parallel to the direction of the connecting line of the moving contact 121 and the static contact 13, which is more beneficial for the contact support 122 to drive the moving contact 121 and the static contact 13 to be quickly separated. The second elastic element 124 may also be a torsion spring fixed on the housing 4, one end of the torsion spring may abut against the limiting boss 41, and the other end of the torsion spring may abut against the contact support 122, and applies a force to the contact support 122 through the other end, so that the contact support 122 drives the moving contact 121 to be quickly separated from the static contact 13.

The stopper boss 41 is a member for fixing the second elastic member 124 and providing a base force to the second elastic member 124. In some embodiments, the limiting boss 41 may be disposed side by side with the stationary contact 13 to save the inner space of the housing. In other embodiments, the position-limiting protrusion 41 may not be disposed alongside the fixed contact 13, so as to increase the flexibility of disposing the second elastic element 124, for example, a larger-sized torsion spring or cylindrical spring may be disposed between the contact holder 122 and the position-limiting protrusion 41, so as to increase the force applied by the second elastic element 124 to the contact holder 122.

In the technical solution of the embodiment of the present application, when the moving contact 121 is separated from the fixed contact 13, the second elastic element can apply a force to the contact support 122 in a direction away from the fixed contact 13, and under the action of the force, the contact support 122 can drive the contact 121 to be separated from the fixed contact 13 quickly, so as to improve the separation efficiency of the moving contact 121 and the fixed contact 13, and further improve the opening efficiency of the circuit breaker.

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 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 (10)

1. A plug-in circuit breaker, comprising:

the switching-on and switching-off mechanism comprises a pressing piece, a moving contact piece and a fixed contact, wherein the pressing piece is connected with the moving contact piece, the fixed contact is arranged opposite to the moving contact piece, and the pressing piece is used for being stressed to drive the moving contact piece to be in contact with or separated from the fixed contact;

the locking mechanism is provided with a locking end, and the locking end is used for being connected with the movable contact piece when the movable contact piece is contacted with the fixed contact so as to limit the movable contact piece; and

and one end of the disconnecting mechanism is connected to the pressing piece, the other end of the disconnecting mechanism faces the locking end, and the disconnecting mechanism is used for moving towards the locking end along with the action of the pressing piece before the movable contact piece is separated from the fixed contact so as to push the locking end against the fixed contact and release the limit of the locking end on the movable contact piece.

2. The plug-in circuit breaker according to claim 1, characterized in that the pressing member comprises a button holder and a button having a movable groove, the button holder being connected with the movable contact member, the button being slidably connected to the button holder;

the disconnecting mechanism comprises an opening and closing piece which is rotatably connected with the movable contact piece, a first end of the opening and closing piece is positioned in the movable groove and attached to the sliding wall of the movable groove to move along with the sliding of the button, a second end faces the locking end, and the opening and closing piece rotates along with the movement of the first end, so that the second end is close to or far away from the locking end along with the different rotating directions of the opening and closing piece.

3. The plug-in circuit breaker according to claim 2, wherein the button holder has a slide rail and a position-limiting portion, at least a portion of the button is located on the slide rail to slide in the slide rail to drive the opening and closing member to rotate, and the position-limiting portion is configured to limit a sliding distance of the button.

4. The plug-in circuit breaker according to claim 2 or 3, characterized in that the breaking mechanism further comprises a first reset element, which exerts a force on the opening element that rotates the opening element in a first direction; the first direction is the direction of the opening and closing piece rotating when the second end is far away from the locking end.

5. The plug-in circuit breaker according to claim 1, characterized in that the latching mechanism comprises a latching element having the latching end and a second resetting element, the latching element being rotatably connected to a housing of the plug-in circuit breaker, the second resetting element applying a force to the latching element that rotates the latching end towards the movable contact element for connection with the movable contact element.

6. Plug-in circuit breaker according to claim 5, characterized in that the moving contact piece is provided with a limiting groove; the locking end faces the notch of the limiting groove; when the breaker is switched on, the locking end enters the limiting groove along the notch and is buckled with the limiting groove to limit the moving contact piece.

7. The plug-in circuit breaker according to claim 6, characterized in that the limiting groove comprises a snap-in wall; the locking end is configured to be a hook-shaped structure, the concave side of the hook-shaped structure is provided with a buckling surface, and the buckling surface is close to the head of the locking end; when the locking end is buckled with the limiting groove, the buckling surface is attached to the buckling wall.

8. The plug-in circuit breaker according to claim 7, characterized in that the angle of slope of the latching wall is configured to be less than or equal to 90 °.

9. The plug-in circuit breaker according to claim 1, characterized in that said movable contact element comprises a movable contact, a contact support and a first elastic element, said movable contact is slidably connected to said contact support, said contact support is connected to said pressing element; the moving contact is used for contacting with the fixed contact; the contact support is provided with a butting part on one side close to the static contact, and the first elastic part exerts a force close to the static contact on the moving contact and enables the moving contact to be butted against the butting part.

10. The plug-in circuit breaker according to claim 9, wherein the movable contact piece further comprises a second elastic piece, the housing of the plug-in circuit breaker having a limit boss, the second elastic piece being connected between the contact holder and the limit boss; the second elastic piece has a force which enables the contact support to be far away from the fixed contact.

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