CN221176123U - Tripping mechanism and circuit breaker - Google Patents

Abstract

The application provides a tripping mechanism and a circuit breaker, and relates to the technical field of electric components. The tripping mechanism is applied to a circuit breaker, and can trip the circuit breaker, and comprises a thermal protection assembly, wherein the thermal protection assembly comprises a mounting frame, a bimetallic strip and a thermal element. The fixed end of the bimetallic strip is connected with the mounting frame, and the movable end of the bimetallic strip can directly or indirectly trigger the circuit breaker to trip. The heat element is fixedly arranged on the mounting frame, the first end of the heat element is connected with a wiring terminal of the circuit breaker, and the second end of the heat element is connected with a moving contact of the circuit breaker. The second end of the thermal element extends out of two connecting support legs which are arranged at intervals, and the two connecting support legs are electrically connected to different positions of the moving contact through a wire structure respectively. According to the tripping mechanism provided by the example of the application, the possibility of hardening of the wire structure can be reduced, and the use reliability of the circuit breaker is ensured.

Description

Tripping mechanism and circuit breaker

Technical Field

The application relates to the technical field of electric components, in particular to a tripping mechanism and a circuit breaker.

Background

A circuit breaker is an electrical component that can provide a safety guarantee for a circuit. Circuit breakers typically include a trip mechanism, an operating mechanism, and a contact mechanism, with the trip mechanism and the contact mechanism being electrically connected by a wire structure, such as in the form of a wire. When the circuit is in overload, short circuit and other states, the tripping mechanism acts to trigger the operating mechanism, so that the contact mechanism is in a separation state, the breaker is opened, and the circuit is protected.

However, based on the structure of the existing trip mechanism, the wire structure is easily hardened during the operation of the circuit breaker, affecting the normal use of the circuit breaker.

Disclosure of utility model

The application provides a tripping mechanism, which solves the problem that a wire structure is easy to harden, reduces the possibility of hardening the wire structure and ensures the use reliability of a circuit breaker.

In a first aspect, an example of the present application provides a trip mechanism for use with a circuit breaker, the trip mechanism capable of tripping the circuit breaker, the trip mechanism comprising a thermal protection assembly comprising a mounting bracket, a bimetal, and a thermal element. The fixed end of the bimetallic strip is connected with the mounting frame, and the movable end of the bimetallic strip can directly or indirectly trigger the circuit breaker to trip. The heat element is fixedly arranged on the mounting frame, the first end of the heat element is connected with a wiring terminal of the circuit breaker, and the second end of the heat element is connected with a moving contact of the circuit breaker. The second end of the thermal element extends out of two connecting support legs which are arranged at intervals, and the two connecting support legs are electrically connected to different positions of the moving contact through a wire structure respectively.

According to the tripping mechanism provided by the example of the application, the mounting frame can provide a mounting carrier for parts such as bimetallic strips, thermal elements and the like. The bimetal can deform under the condition of overload of the circuit, and directly or indirectly pushes against the operating mechanism to trigger the circuit breaker to trip. The first end of the thermal element is connected with a wiring terminal of the circuit breaker, and the second end of the thermal element is connected with a moving contact of the circuit breaker, so that the electric connection of a main loop in the circuit breaker is realized. The second end of the thermal element stretches out the connection stabilizer blade that two intervals set up, and two connection stabilizer blades are connected to the different positions of moving contact through the wire structure electricity respectively, and two connection stabilizer blades that the interval set up make different wire structures can separate the connection moving contact, have reduced the possibility of mutual contact between different wire structures for every wire structure is great with the area of air contact, has increased the heat radiating area of wire structure, has reduced the possibility of wire structure hardening, has guaranteed the reliability in use of circuit breaker.

In one possible implementation, a thermal element includes a first body and a second body. The first end of the first main body is connected with a wiring terminal of the circuit breaker. The second main body is connected with the second end of first main body, and the second main body is the angle setting with first main body, and the second main body extends along the direction towards the moving contact. The connecting support leg is arranged on the second main body, and the connecting support leg is positioned on one side of the second main body, which is away from the first main body.

According to the tripping mechanism provided by the example, the length of the thermal element can be prolonged, so that the thermal element can generate enough heat to cause the bimetal to be deformed by heating to push against the operating mechanism, and the circuit breaker trips; the material consumption of the wire structure can be reduced, and the manufacturing cost of the tripping mechanism is saved.

In one possible implementation, the connection leg is arranged at an angle to the second body of the thermal element, the connection leg extending in a direction towards the moving contact.

According to the tripping mechanism provided by the example, the influence on the rotation of the moving contact can be reduced, and the use reliability of the circuit breaker is ensured.

In one possible implementation, the two connecting feet are arranged parallel or the two connecting feet are arranged at an angle.

In one possible implementation, both connecting legs are of flat plate structure or of curved plate structure, or one connecting leg is of flat plate structure and the other connecting leg is of curved plate structure.

In one possible implementation, the trip mechanism further includes a magnetic protection assembly including a yoke, an armature, and an elastic member. Wherein, yoke fixed mounting is in the mounting bracket. The armature is rotatably mounted to the mounting bracket. One end of the elastic piece is connected with the armature, and the other end of the elastic piece is connected with the mounting frame. The elastic piece can drive the armature to rotate along the first direction, the armature can rotate along the second direction under the magnetic field generated by the magnetic yoke, and the armature can directly or indirectly trigger the circuit breaker to trip after the attraction force generated by the magnetic yoke is larger than the elastic force of the elastic piece.

According to the tripping mechanism provided by the example, the magnetic protection component can trigger the circuit breaker to trip under the condition of short circuit of the circuit, so as to protect the circuit.

In one possible implementation, the end of the mounting frame facing the moving contact is provided with at least one limiting portion capable of limiting the maximum rotation angle of the armature.

The limiting part limits the distance between the armature and the traction rod to be relatively fixed, so that the rotation of the armature can directly or indirectly trigger the operating mechanism when the circuit is short-circuited, and the circuit breaker is tripped.

In addition, because the maximum rotation angle of the armature can be limited by the limiting part, under the condition that the circuit breaker works normally, the distance between the armature and the traction rod is maintained at a fixed value, and under the condition that the circuit breaker breaks down, an operator can conveniently judge whether the circuit breaker breaks down or not due to the fact that the distance between the armature and the traction rod changes.

In one possible implementation manner, the mounting frame comprises a first side plate and a second side plate which are arranged at intervals, the first side plate is connected with the second side plate through a connecting plate, a mounting hole is formed in the first side plate, and a mounting groove is formed in the second side plate. One side of the armature is provided with a first bulge, the first bulge is matched with the mounting hole, the other side of the armature is provided with a second bulge, the second bulge is clamped with the mounting groove, and the armature is rotationally connected with the mounting frame.

According to the tripping mechanism provided by the example, the armature and the mounting frame can be matched conveniently, and the assembly efficiency of the mounting frame and the armature is improved.

In one possible implementation manner, the armature includes a first action portion and a second action portion that are disposed at intervals, the armature rotates under a magnetic field generated by the magnetic yoke, the first action portion can directly or indirectly trigger the circuit breaker to trip, and the second action portion is fixedly connected with the elastic member.

The first action part and the second action part are arranged at intervals, so that the relevance between the first action part and the second action part can be reduced, and the adjustment efficiency of the tripping mechanism can be improved.

In a second aspect, the present example provides a circuit breaker comprising a base, a drawbar, and a trip mechanism provided in each of the possible implementations of the first aspect described above. The traction rod and the tripping mechanism are both arranged on the base, and the tripping mechanism can directly or indirectly push the traction rod to move so as to trip the circuit breaker.

The advantages of the second aspect and the circuit breaker provided in each possible design of the second aspect may be referred to the advantages brought by each possible implementation of the first aspect and each possible implementation of the first aspect, which are not described herein again.

Drawings

Fig. 1 is a schematic structural diagram of a trip mechanism according to an example of the present application.

Fig. 2 is a schematic structural diagram of a thermal protection assembly according to an example of the present application.

Fig. 3 is a schematic structural view of a thermal element according to an example of the present application.

Fig. 4 is a schematic structural view of another thermal element provided by an example of the present application.

Fig. 5 is a schematic structural diagram of a magnetic protection component provided by an example of the present application.

Fig. 6 is a schematic structural view of a mounting frame according to an example of the present application.

Fig. 7 is a schematic structural diagram of an armature according to an example of the present application.

Reference numerals illustrate:

100. A trip mechanism; 110. a thermal protection assembly; 111. a mounting frame; 1111. a first side plate; 1112. a second side plate; 1113. a connecting plate; 1114. a limit part; 112. bimetallic strips; 113. a thermal element; 1131. a connecting support leg; 1132. a first body; 1133. a second body; 120. a magnetic protection assembly; 121. a yoke; 122. an armature; 1221. a first action part; 1222. a second operation unit; 1223. a first protrusion; 1224. a second protrusion; 123. an elastic member; 200. a wire structure; 300. and a moving contact.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present examples more apparent, the technical solutions in the present examples will be clearly and completely described below with reference to the accompanying drawings in the present examples, and it is apparent that the described examples are some, but not all examples of the present application. All other examples, which a person of ordinary skill in the art would obtain without undue burden based on the examples in this disclosure, are within the scope of this disclosure.

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 applications herein is for the purpose of describing particular examples 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 the application and in the description of the drawings are intended to cover a non-exclusive inclusion.

Reference herein to "an example" means that a particular feature, structure, or characteristic described in connection with the example may be included in at least one example of the application. The appearances of the phrase "in an example" in various places in the specification are not necessarily all referring to the same example, nor are separate or alternative examples mutually exclusive of other examples. Those skilled in the art will explicitly and implicitly understand that the examples described herein may be combined with other examples.

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The directional terms appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the trip mechanism of the present application.

Furthermore, the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order, and may be used to improve one or more of these features either explicitly or implicitly.

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

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., the terms "connected" or "connected" of a mechanical structure may refer to a physical connection, e.g., the physical connection may be a fixed connection, e.g., by a spacer, such as by a screw, bolt, or other spacer; the physical connection may also be a detachable connection, such as a snap-fit or snap-fit connection; the physical connection may also be an integral connection, such as a welded, glued or integrally formed connection. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

A circuit breaker is an electrical component that protects a circuit. The circuit breaker can jump from closing to tripping under the condition of overload and short circuit in the circuit, so that the circuit is in a broken state, and the circuit is protected. Circuit breakers typically include a trip mechanism, an operating mechanism, and a contact mechanism. Under the conditions of overload and short circuit of a circuit, the tripping mechanism can trigger the operating mechanism most directly or indirectly, and the operating mechanism drives the moving contact in the contact mechanism to act, so that the circuit breaker is opened, and the circuit is protected.

Based on the existing structure of the circuit breaker, the tripping mechanism is electrically connected with the moving contact through different wire structures, but due to the structural limitation of the existing tripping mechanism, the different wire structures can be contacted with each other. Under the conditions of overload and short circuit of a circuit, heat is generated by a thermal element and a wire structure in the tripping mechanism, the wire structure is easy to harden, the rotation of a moving contact is influenced, and then the normal use of the circuit breaker is influenced.

Based on the foregoing, an example of the present application provides a trip mechanism and a circuit breaker.

In order to better understand the solution of the present application, the trip mechanism provided by the example of the present application will be clearly and completely described below with reference to the accompanying drawings.

An example of the present application provides a trip mechanism, which is applied to a circuit breaker, and the trip mechanism is capable of tripping the circuit breaker, fig. 1 is a schematic structural diagram of the trip mechanism provided by the example of the present application, fig. 2 is a schematic structural diagram of a thermal protection assembly provided by the example of the present application, and referring to fig. 1 and 2, the trip mechanism 100 may include a thermal protection assembly 110, and the thermal protection assembly 110 includes a mounting frame 111, a bimetal 112, and a thermal element 113. Wherein, the fixed end of bimetallic strip 112 is connected with mounting bracket 111, and the movable end of bimetallic strip 112 can trigger the circuit breaker to trip directly or indirectly. The thermal element 113 is fixedly mounted on the mounting frame 111, a first end of the thermal element 113 is connected with a wiring terminal of the circuit breaker, and a second end of the thermal element 113 is connected with a moving contact 300 of the circuit breaker. The second end of the thermal element 113 extends out of two spaced apart connection legs 1131, the two connection legs 1131 being electrically connected to different positions of the moving contact 300 through the wire structure 200, respectively. The number of trip mechanisms 100 corresponds to the number of phases of the circuit breaker.

According to the trip mechanism 100 provided by the example of the present application, the mounting frame 111 may provide a mounting carrier for the bimetal 112, the thermal element 113, and other components. The bimetal 112 may deform in the event of an overload of the circuit, directly or indirectly pushing against the operating mechanism, triggering the circuit breaker to trip. The first end of the thermal element 113 is connected with a wiring terminal of the circuit breaker, and the second end of the thermal element 113 is connected with a moving contact 300 of the circuit breaker, so that the electric connection of a main circuit in the circuit breaker is realized.

For the second end of the thermal element 113, the second end of the thermal element 113 may extend out of two connection legs 1131 disposed at intervals, and the two connection legs 1131 are electrically connected to different positions of the moving contact 300 through different wire structures 200, based on this, the two connection legs 1131 disposed at intervals enable the different wire structures 200 to be separately connected to the moving contact 300, so that the possibility of mutual contact between the different wire structures 200 is reduced, the contact area between each wire structure 200 and the air is larger, the heat dissipation area of the wire structures 200 is increased, the possibility of hardening of the wire structures 200 is reduced, and the reliability of the circuit breaker in use is ensured.

The above examples provide that the thermal protection assembly 110 in the trip mechanism 100 is capable of directly or indirectly triggering the tripping of a circuit breaker in the event of an overload of the circuit. The specific structure of the thermal protection assembly 110 is described next.

The mounting frame 111 may be an integrally formed structural member, or the mounting frame 111 may be formed by splicing a plurality of plate structures, which may enclose to form a slot-shaped space. The mounting 111 may also be a flat plate structure. The present example is not limited to a particular implementation of the mounting 111.

The fixed end of the bimetallic strip 112 can be directly and fixedly arranged on the mounting frame 111, and the bimetallic strip 112 can deform when a circuit is overloaded, so that the free end of the bimetallic strip 112 directly pushes against a traction rod or other components in the operating mechanism, or the free end of the bimetallic strip 112 pushes against the operating mechanism through a transmission mechanism to drive a contact mechanism of the circuit breaker to act, and the circuit breaker trips.

The fixed end of the bimetal 112 may be fixedly installed between the mounting frame 111 and the thermal element 113, and the fixed end of the bimetal 112 may also be fixedly installed on one side of the thermal element 113 facing the contact mechanism, so long as the bimetal 112 and the thermal element 113 are ensured to be fixedly connected, when the circuit is overloaded, heat generated by the thermal element 113 can be transferred to the bimetal 112, so that the bimetal 112 is deformed by heating.

The first end of the thermal element 113 may be connected to a connection terminal of the circuit breaker, and the second end of the thermal element 113 is electrically connected to the moving contact 300 of the circuit breaker, so as to realize an electrical connection of the main circuit in the circuit breaker.

At least part of the thermal element 113 may coincide with the bimetal 112, so that the thermal element 113 is in surface contact with the bimetal 112, and the contact area between the thermal element 113 and the bimetal 112 is increased, so that heat generated by the thermal element 113 may be transferred to the bimetal 112 through the heat conducting property of the metal, and the bimetal 112 is heated and bent.

The second end of the thermal element 113 may extend out of two spaced apart connection legs 1131, where the two connection legs 1131 are electrically connected to different portions of the moving contact 300 through different wire structures 200, respectively. The wire structure 200 may be a flexible connection structure, and may specifically be a braided wire, a flat cable, or the like.

The two connection legs 1131 may be disposed at the same side of the thermal element 113, and the two connection legs 1131 may be disposed at different sides of the thermal element 113, respectively, and the specific location of the connection legs 1131 is not limited in the present example.

Compared with the prior art that different wire structures are contacted, in the example of the application, the wire structures 200 can be connected to different positions of the moving contact 300 from different connection support legs 1131, so that the possibility of mutual contact between different wire structures 200 is reduced, the contact area of each wire structure 200 with air is larger, the heat dissipation area of the wire structure 200 is increased, the hardening possibility of the wire structure 200 is reduced, and the use reliability of the circuit breaker is ensured.

Based on the trip mechanism 100 provided by the above example, fig. 3 is a schematic structural diagram of a thermal element provided by the example of the present application, and referring to fig. 3, the thermal element 113 includes a first body 1132 and a second body 1133. Wherein, the first end of the first body 1132 is connected with the connection terminal of the circuit breaker. The second body 1133 is connected to the second end of the first body 1132, the second body 1133 is disposed at an angle with respect to the first body 1132, and the second body 1133 extends in a direction toward the moving contact 300. The connection legs 1131 are disposed on the second body 1133, with the connection legs 1131 being on a side of the second body 1133 facing away from the first body 1132.

The first body 1132 may include a plurality of connected segments, and a bending part may be disposed between the different segments, so that the different segments are located in different planes, based on which at least one segment of the first body 1132 may be in surface contact with the bimetal 112, and in the case of overload of the circuit, heat generated by the segment is transferred to the bimetal 112 through the heat conductive property of the metal. Gaps exist between the rest segments and the bimetallic strip 112, and heat generated by the rest segments can be transmitted to the bimetallic strip 112 through air, so that the bimetallic strip 112 is deformed by heating, and the operating mechanism is directly or indirectly pushed.

The first body 1132 and the second body 1133 are arranged at an angle to prolong the length of the thermal element 113, so that the thermal element 113 can generate enough heat under the condition of overload of a circuit, and the bimetallic strip 112 is heated to deform to push against the operating mechanism, so that the circuit breaker trips.

The second body 1133 of the thermal element 113 may be fixedly mounted to the base of the circuit breaker, either directly or indirectly.

The connection support 1131 may be disposed on a side of the second body 1133 facing away from the first body 1132, so that the material used for the wire structure 200 may be reduced, and the manufacturing cost of the trip mechanism 100 may be saved. Along the direction from the second body 1133 to the connection support 1131, the second body 1133 and the connection support 1131 may be in the same plane, and the second body 1133 and the connection support may also be disposed at an angle.

In summary, according to the trip mechanism 100 provided in this example, the length of the thermal element 113 may be prolonged, so that the thermal element 113 may generate enough heat to cause the bimetal 112 to deform under heating to push against the operating mechanism, so as to trip the circuit breaker; the trip mechanism 100 provided in this example may also reduce the material used for the wire structure 200, and save the manufacturing cost of the trip mechanism 100.

Based on the trip mechanism 100 provided in the foregoing example, fig. 4 is a schematic structural diagram of another thermal element provided in the present application, referring to fig. 4, the connection leg 1131 is disposed at an angle with respect to the second body 1133 of the thermal element 113, and the connection leg 1131 extends in a direction toward the moving contact 300.

The angle a formed by the connection support leg 1131 and the thermal element 113 may be greater than 0 ° and less than 180 °, the connection support leg 1131 extends along a direction towards the moving contact 300, and the connection support leg 1131 may be close to an extension line of a rotation track of the moving contact 300 or be located on an extension line of an initial position of the moving contact 300, based on which an influence on rotation of the moving contact 300 may be reduced, and use reliability of the circuit breaker is ensured.

Based on the trip mechanism 100 provided in the above example, two connection legs 1131 are disposed in parallel, or two connection legs 1131 are disposed at an angle.

In the case where the connection legs 1131 are located on the same side of the second body 1133 of the thermal element 113, the distance between the two connection legs 1131 may be reduced or the distance between the two connection legs 1131 may be increased along the direction from the second body 1133 to the connection legs 1131, and the distance between the two connection legs 1131 may be unchanged as long as the distance between the wire structures 200 connected to the two connection legs 1131, respectively, is ensured.

Based on the trip mechanism 100 provided in the above example, both the connection legs 1131 are of a flat plate structure or a curved plate structure, or one connection leg 1131 is of a flat plate structure and the other connection leg 1131 is of a curved plate structure.

The wire structure 200 may be soldered to the thermal element 113, based on which, whether the connection leg 1131 is a flat plate structure or a curved plate structure, the connection leg 1131 may provide a soldered surface for the wire structure 200 and the thermal element 113, so that the connection between the wire structure 200 and the thermal element 113 is more reliable.

Based on the trip mechanism 100 provided by the above example, fig. 5 is a schematic structural diagram of a magnetic protection assembly provided by the example of the present application, referring to fig. 1 and 5, the trip mechanism 100 further includes a magnetic protection assembly 120, and the magnetic protection assembly 120 includes a yoke 121, an armature 122, and an elastic member 123. Wherein the yoke 121 is fixedly mounted to the mounting frame 111. Armature 122 is rotatably mounted to mounting frame 111. One end of the elastic member 123 is connected to the armature 122, and the other end of the elastic member 123 is connected to the mounting bracket 111. The elastic member 123 can drive the armature 122 to rotate along the first direction, the armature 122 can rotate along the second direction under the magnetic field generated by the magnetic yoke 121, and after the attractive force generated by the magnetic yoke 121 is greater than the elastic force of the elastic member 123, the armature 122 can directly or indirectly trigger the circuit breaker to trip.

The magnetic protection assembly 120 is capable of directly or indirectly triggering the circuit breaker to trip in the event of a short circuit.

Specifically, in the case of normal operation of the circuit breaker, one end of the elastic member 123 is connected to the first end of the armature 122, the other end of the elastic member 123 is connected to the mounting bracket 111, and the armature 122 rotates in the first direction under the action of the elastic member 123. Specifically, the first end of the armature 122 is rotated near the mounting frame 111, and since the armature 122 is rotatably mounted to the mounting frame 111, the second end of the armature 122 can be rotated away from the mounting frame 111, and based on fig. 5, the armature 122 is rotated in a counterclockwise direction by the elastic member 123.

In the case of a short circuit of the circuit breaker, the current in the circuit is large, the yoke 121 can generate a strong magnetic field, and at this time, the attractive force generated by the yoke 121 can overcome the elastic force of the elastic member 123, and the armature 122 rotates in the second direction. Specifically, the yoke 121 engages the second end of the armature 122 such that the armature 122 rotates in a clockwise direction, the first end of the magnet is away from the mounting bracket 111, rotates toward and pushes against the drawbar, or the first end of the magnet may trigger the operating mechanism via the transmission mechanism such that the circuit breaker trips.

In summary, the magnetic protection component 120 can trigger the circuit breaker to trip in case of short circuit of the circuit, and protect the circuit.

Based on the trip mechanism 100 provided in the foregoing example, fig. 6 is a schematic structural diagram of a mounting rack provided in the present application, referring to fig. 5 and 6, an end of the mounting rack 111 facing the moving contact 300 is provided with at least one limiting portion 1114, and the limiting portion 1114 can limit a maximum rotation angle of the armature 122.

The stopper 1114 may be provided with one or two. The limiting part 1114 can limit the maximum rotation angle of the armature 122, that is, under the condition that the circuit breaker works normally, the limiting part 1114 can limit the distance between the second end of the armature 122 and the mounting frame 111, so that the second end of the armature 122 is maintained at a position with a certain distance from the mounting frame 111, the distance between the second end of the armature 122 and the mounting frame 111 is also relatively fixed, the distance between the second end of the armature 122 and the traction rod is relatively fixed, and the rotation of the armature 122 can directly or indirectly trigger an operating mechanism when the circuit breaker is short-circuited, so that the circuit breaker trips.

In addition, because the limiting part 1114 can limit the maximum rotation angle of the armature 122, under the condition that the circuit breaker works normally, the distance between the armature 122 and the traction rod is maintained at a fixed value, and under the condition that the circuit breaker breaks down, an operator can conveniently judge whether the circuit breaker breaks down or not due to the fact that the distance between the armature 122 and the traction rod changes.

Based on the trip mechanism 100 provided in the above example, please continue to refer to fig. 5 and 6, the mounting rack 111 includes a first side plate 1111 and a second side plate 1112 disposed at intervals, the first side plate 1111 and the second side plate 1112 are connected by a connecting plate 1113, a mounting hole is formed on the first side plate 1111, and a mounting slot is formed on the second side plate 1112. One side of the armature 122 is provided with a first protrusion 1223, the first protrusion 1223 is matched with the mounting hole, the other side of the armature 122 is provided with a second protrusion 1224, the second protrusion 1224 is clamped with the mounting groove, and the armature 122 is rotatably connected with the mounting frame 111.

In the installation process of the armature 122 and the mounting frame 111, one side of the armature 122 provided with the first protrusion 1223 can firstly extend into the mounting hole, then one side of the armature 122 provided with the second protrusion 1224 can enter into the mounting groove to be clamped with the mounting groove, so that the armature 122 and the mounting frame 111 can be conveniently matched, and the assembly efficiency of the mounting frame 111 and the armature 122 is improved.

The first protrusion 1223 and the second protrusion 1224 may be cylindrical, the first protrusion 1223 and the mounting hole may be in clearance fit, and the bottom of the mounting groove may be arc-shaped, so that the armature 122 may rotate relatively flexibly with respect to the mounting frame 111. The first protrusions 1223 and the second protrusions 1224 may also be prismatic or other shapes.

The opening direction of the mounting groove may be directed away from the yoke 121. The distance between the side walls of the two mounting grooves can be always equal along the direction from the notch of the mounting groove to the groove bottom, and the distance between the two side walls can also be increased.

In the event that the distance between the two sidewalls of the mounting groove increases, the dimension at the mounting groove slot opening may be smaller than the dimension of the second protrusion 1224. Based on this, in the case that the second protrusion 1224 is clamped with the mounting groove, the second protrusion 1224 is not easy to disengage from the mounting groove, so that the assembly reliability of the second protrusion 1224 and the mounting groove can be ensured, and the connection reliability of the armature 122 and the mounting frame 111 can be further ensured.

The first side plate 1111 and the second side plate 1112 may be provided with mounting holes, or the first side plate 1111 and the second side plate 1112 may be provided with mounting grooves, respectively.

Based on the trip mechanism 100 provided by the above example, fig. 7 is a schematic structural diagram of an armature provided by the present application, referring to fig. 1, 5 and 7, the armature 122 includes a first actuating portion 1221 and a second actuating portion 1222 that are disposed at intervals, the armature 122 rotates under a magnetic field generated by the yoke 121, the first actuating portion 1221 can directly or indirectly trigger the circuit breaker to trip, and the second actuating portion 1222 is fixedly connected with the elastic member 123.

The first and second operation portions 1221 and 1222 disposed at a distance from each other may be connected to each other by an armature body. The first actuating portion 1221 may be bent toward the traction lever to form a pushing portion, and in the event of a short circuit, the first actuating portion 1221 rotates toward the traction lever, and the pushing portion pushes the traction lever, thereby triggering the circuit breaker to trip. The second actuating portion 1222 may be bent in a direction away from the drawbar to form a connection portion, and the connection portion is connected to an end of the elastic member 123.

In the prior art, the first action part and the second action part are integrally arranged, when the elastic piece connected with the second action part is adjusted, the second action part can be driven to move by the movement of the second action part, so that the distance between the first action part and the traction rod is changed, and when a circuit is short-circuited, the first action part can not push the traction rod, and the circuit breaker can not trip.

In the present example, since the first actuating portion 1221 and the second actuating portion 1222 are disposed at intervals, when the elastic member 123 is adjusted, the second actuating portion 1222 moves in a direction perpendicular to the first actuating portion 1221 to the traction rod, and the second actuating portion 1222 is disposed at intervals from the first actuating portion 1221, and the distance between the first actuating portion 1221 and the traction rod is along the direction from the first actuating portion 1221 to the traction rod, so that the influence of the movement of the second actuating portion 1222 on the first actuating portion 1221 is small, and the position adjustment of the armature 122 can be more convenient.

In summary, by providing the first operation portion 1221 and the second operation portion 1222 at a distance from each other, the correlation between the first operation portion 1221 and the second operation portion 1222 can be reduced, and the adjustment efficiency of the trip mechanism 100 can be improved.

In the case where a current transformer is provided in the circuit breaker, the current transformer may be installed at a side of the trip mechanism 100 facing away from the moving contact 300. In the existing tripping mechanism, the magnetic yoke is arranged on one side, close to the current transformer, of the mounting frame, and when a circuit is short-circuited, the magnetic yoke is required to generate a magnetic field attracting magnet with certain strength, so that the volume of the magnetic yoke is required to be ensured, and further the suction force generated by the magnetic yoke is ensured to be strong enough, so that the current transformer can collide with the magnetic yoke in the mounting process of the current transformer, and the current transformer is damaged.

In this example, the yoke 121 may be mounted on a side of the mounting frame 111 facing away from the current transformer, and a distance between the connection plate 1113 of the mounting frame 111 and the base may be greater than a distance between the yoke 121 and the base, based on which a larger space may be provided between the yoke 121 and the current transformer, and a possibility that the current transformer contacts the yoke 121 or other parts may be reduced during the mounting of the current transformer.

The yoke 121 may be fixedly installed between the mounting frame 111 and the heat element 113, or the yoke 121 may be fixedly installed between the mounting frame 111 and the armature 122, and the installation position of the yoke 121 is not particularly limited in the example of the present application, so long as a spacer exists between the yoke 121 and the current transformer, so as to reduce the possibility of damage to the current transformer.

Another example of the present application provides a circuit breaker including a base, a drawbar, and a trip mechanism 100 provided by the foregoing examples. Wherein, the traction rod and the tripping mechanism 100 are both arranged on the base, and the tripping mechanism 100 can directly or indirectly push the traction rod to move so as to trip the circuit breaker. Specifically, the trip mechanism 100 included in the circuit breaker may include a thermal protection assembly 110, and the thermal protection assembly 110 includes a mounting frame 111, a bimetal 112, and a thermal element 113. Wherein, the fixed end of bimetallic strip 112 is connected with mounting bracket 111, and the movable end of bimetallic strip 112 can trigger the circuit breaker to trip directly or indirectly. The thermal element 113 is fixedly mounted on the mounting frame 111, a first end of the thermal element 113 is connected with a wiring terminal of the circuit breaker, and a second end of the thermal element 113 is connected with a moving contact 300 of the circuit breaker. The second end of the thermal element 113 extends out of two spaced apart connection legs 1131, the two connection legs 1131 being electrically connected to different positions of the moving contact 300 through the wire structure 200, respectively.

According to the circuit breaker provided by the example of the application, the base can provide a mounting carrier for the drawbar, trip mechanism 100. The mounting bracket 111 in the trip mechanism 100 may provide a mounting carrier for the bimetal 112, the thermal element 113, and the like. The bimetal 112 may deform in the event of an overload of the circuit, directly or indirectly pushing against the operating mechanism, triggering the circuit breaker to trip. The first end of the thermal element 113 is connected with a wiring terminal of the circuit breaker, and the second end of the thermal element 113 is connected with a moving contact 300 of the circuit breaker, so that the electric connection of a main circuit in the circuit breaker is realized. The second end of the thermal element 113 extends out of two connection legs 1131 arranged at intervals, the two connection legs 1131 are respectively and electrically connected to different positions of the moving contact 300 through the wire structure 200, based on the fact that the wire structure 200 can be connected to different positions of the moving contact 300 from different connection legs 1131, the possibility of mutual contact between different wire structures 200 is reduced, the contact area of each wire structure 200 with air is larger, the heat dissipation area of the wire structure 200 is increased, the hardening possibility of the wire structure 200 is reduced, and the use reliability of the circuit breaker is guaranteed.

Other benefits of the circuit breaker can be seen from the above possible examples, and will not be described herein.

Finally, it should be noted that: the above embodiments are merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (10)

1. A trip mechanism for a circuit breaker, the trip mechanism capable of tripping the circuit breaker, the trip mechanism comprising a thermal protection assembly comprising:

A mounting frame;

The fixed end of the bimetallic strip is connected with the mounting frame, and the movable end of the bimetallic strip can directly or indirectly trigger the circuit breaker to trip;

The thermal element is fixedly arranged on the mounting frame, a first end of the thermal element is connected with a wiring terminal of the circuit breaker, and a second end of the thermal element is connected with a moving contact of the circuit breaker;

The second end of the thermal element extends out of two connecting support legs which are arranged at intervals, and the two connecting support legs are electrically connected to different positions of the moving contact through a wire structure respectively.

2. The trip mechanism of claim 1, wherein the thermal element comprises:

the first end of the first main body is connected with a wiring terminal of the circuit breaker;

The second main body is connected with the second end of the first main body, is arranged at an angle with the first main body and extends along the direction towards the moving contact;

The connecting support leg is arranged on the second main body, and the connecting support leg is positioned on one side of the second main body, which faces away from the first main body.

3. The trip mechanism of claim 2, wherein the connection leg is disposed at an angle to the second body of the thermal element, the connection leg extending in a direction toward the moving contact.

4. The trip mechanism of claim 1 wherein two of said connecting legs are disposed in parallel or wherein two of said connecting legs are disposed at an angle.

5. The trip mechanism of claim 4, wherein both of said connecting legs are of flat plate construction or of curved plate construction, or one of said connecting legs is of flat plate construction and the other of said connecting legs is of curved plate construction.

6. The trip mechanism of any one of claims 1 to 5, further comprising a magnetic protection assembly comprising:

a magnetic yoke fixedly mounted on the mounting frame;

The armature is rotatably arranged on the mounting frame;

one end of the elastic piece is connected with the armature, and the other end of the elastic piece is connected with the mounting frame;

The elastic piece can drive the armature to rotate along a first direction, the armature can rotate along a second direction under a magnetic field generated by the magnetic yoke, and the armature can trigger the circuit breaker to trip directly or indirectly after the attraction force generated by the magnetic yoke is larger than the elastic force of the elastic piece.

7. The trip mechanism of claim 6, wherein an end of the mounting bracket facing the moving contact is provided with at least one limit portion capable of limiting a maximum rotation angle of the armature.

8. The trip mechanism of claim 6, wherein the mounting frame comprises a first side plate and a second side plate which are arranged at intervals, the first side plate and the second side plate are connected through a connecting plate, a mounting hole is formed in the first side plate, and a mounting groove is formed in the second side plate;

One side of the armature is provided with a first bulge, the first bulge is matched with the mounting hole, the other side of the armature is provided with a second bulge, the second bulge is clamped with the mounting groove, and the armature is rotationally connected with the mounting frame.

9. The trip mechanism of claim 7, wherein,

The armature comprises a first action part and a second action part which are arranged at intervals, the armature rotates under a magnetic field generated by the magnetic yoke, the first action part can directly or indirectly trigger the circuit breaker to trip, and the second action part is fixedly connected with the elastic piece.

10. A circuit breaker, comprising:

a base;

a traction rod;

And a trip mechanism according to any one of claims 1 to 9;

The traction rod and the tripping mechanism are both arranged on the base, and the tripping mechanism can directly or indirectly push the traction rod to move so as to trip the circuit breaker.