CN113257643B - Circuit breaking mechanism and circuit breaker with same - Google Patents

Abstract

The invention relates to a circuit breaking mechanism and a circuit breaker with the same, wherein the circuit breaking mechanism comprises a fixed contact, a movable contact, a wire outlet end connecting strip, a first electromagnetic driving unit and a second electromagnetic driving unit; one end of the static contact is abutted against one end of the moving contact, and the other end of the static contact is fixedly connected with one end of the leading-out terminal connecting strip; the connecting ends of the static contact and the wire outlet end connecting strip are wound on the first electromagnetic driving unit; a second electromagnetic driving unit is fixed at one end of the wire outlet end connecting strip, which is far away from the static contact; the first electromagnetic driving unit and the second electromagnetic driving unit are in transmission connection with the moving contact. When the short-circuit current is small, the short-circuit current can excite the second electromagnetic driving unit to start working. When the short-circuit current is large, the short-circuit current can excite the first electromagnetic driving unit to start working. The first electromagnetic driving unit and the second electromagnetic driving unit are mutually cooperated, so that the circuit breaker has a double instantaneous protection function, and the breaking capacity of the circuit breaker mechanism is effectively improved.

Description

Circuit breaking mechanism and circuit breaker with same

Technical Field

The invention relates to the technical field of circuit breakers, in particular to a circuit breaking mechanism and a circuit breaker with the same.

Background

With the development of electric appliances, the application of the circuit breaker in a terminal power distribution system is more and more common, and the circuit breaker mainly plays a role in protecting lines and equipment in the terminal power distribution system. When a line is shorted out by a fault, a greater or lesser short circuit current is generated in the line. The breaker can break the short-circuit current by itself, and the short-circuit current is prevented from damaging circuits or equipment.

However, when the conventional breaking mechanism is used for breaking the short-circuit current, the breaking capability is poor.

Disclosure of Invention

The invention provides a circuit breaking mechanism and a circuit breaker with the same, aiming at solving the problem that the breaking capacity is poor when the traditional circuit breaking mechanism is used for breaking short-circuit current.

The circuit breaking mechanism comprises a fixed contact, a movable contact, a wire outlet end connecting strip, a first electromagnetic driving unit and a second electromagnetic driving unit;

one end of the static contact is abutted against one end of the moving contact, and the other end of the static contact is fixedly connected with one end of the leading-out terminal connecting strip;

the connecting ends of the static contact and the wire outlet end connecting strip are wound on the first electromagnetic driving unit;

a second electromagnetic driving unit is fixed at one end of the wire outlet end connecting strip, which is far away from the static contact;

the first electromagnetic driving unit and the second electromagnetic driving unit are in transmission connection with the moving contact; the first electromagnetic driving unit and the second electromagnetic driving unit can separate the movable contact from the fixed contact.

In one specific embodiment, the first electromagnetic driving unit comprises a first static iron core, a first movable iron core and a first transmission component;

one end of the static contact, which is connected with the leading-out end connecting strip, is wound on the first static iron core;

the first movable iron core is of a plate-shaped structure, is arranged right above the first static iron core, and one side of the first movable iron core is pressed against the first transmission assembly and can rotate towards the first static iron core;

the first transmission component is in transmission connection with the moving contact.

In one specific embodiment, the first stationary iron core is of a U-shaped structure integrally and comprises a first magnetic conducting rod and a first magnetic conducting plate;

the first magnetic conduction plate is arranged opposite to the first movable iron core;

the two first magnetic conduction rods are vertically arranged, the bottoms of the two first magnetic conduction rods are fixed on the top end surface of the first magnetic conduction plate, and the tops of the two first magnetic conduction rods face the first movable iron core;

one end of the static contact, which is connected with the leading-out end connecting strip, is wound on one of the first magnetic conducting rods; one end of the outlet end connecting strip connected with the static contact is wound on the other first magnetic conducting rod.

In one embodiment, the first transmission assembly comprises a support plate, a first push rod, a connecting rod and a driving rod;

the number of the supporting plates is two, and the two supporting plates are respectively a first supporting plate and a second supporting plate; the first supporting plate and the second supporting plate are arranged oppositely; mounting grooves are formed in the first supporting plate and the second supporting plate;

the two first push rods are obliquely arranged; one of the first support plate and the second support plate is arranged on one side of the first support plate close to the second support plate, and the bottom of the first support plate is rotatably connected with the first support plate through a first rotating shaft and a first torsion spring; the other one is arranged on one side of the second support plate, which is far away from the first support plate, and the bottom of the other one is rotationally connected with the second support plate through a second rotating shaft and a second torsion spring;

the connecting rod is one, is arranged between the first supporting plate and the second supporting plate, one end of the connecting rod is positioned in the mounting groove of the first supporting plate and is fixedly connected with the bottom of one first push rod, and the other end of the connecting rod is positioned in the mounting groove of the second supporting plate and is fixedly connected with the bottom of the other first push rod;

the actuating lever is one, locates the one side that first backup pad deviates from the second backup pad, and one end and the one end fixed connection that the connecting rod is located the mounting groove of first backup pad, and the lateral wall moves one side looks butt of iron core with first.

In one specific embodiment, the second electromagnetic driving unit comprises a second static iron core, a second movable iron core and a second transmission assembly;

the second static iron core is fixed at one end of the wire outlet end connecting strip, which is far away from the static contact;

the second movable iron core is of a plate-shaped structure, is arranged right above the second static iron core and can rotate towards the second static iron core;

the second transmission assembly is integrally arranged above the second movable iron core and comprises an armature bar, a traction bar and a second push rod;

the bottom of the armature bar is fixed on the top end face of the second movable iron core;

the traction rod is obliquely arranged, the bottom of the traction rod is rotationally connected with the top of the armature bar through a second rotating shaft and a second torsion spring, and the top of the traction rod is provided with a buckling part;

the second push rod is also obliquely arranged, the top of the second push rod is also provided with a buckling part, and the top of the traction rod and the top of the second push rod are buckled and connected through the buckling part; the top of the second push rod can drive the moving contact to rotate.

In one specific embodiment, the second stationary iron core is of a U-shaped structure integrally and comprises a second magnetic conducting rod and a second magnetic conducting plate;

the second magnetic conduction plate is arranged opposite to the second movable iron core;

the second magnetic conducting rods are arranged vertically, the bottoms of the second magnetic conducting rods are fixed on the top end face of the second magnetic conducting plate, the tops of the second magnetic conducting rods face the second movable iron core, and the middle of the second magnetic conducting rods is fixed at one end, far away from the fixed contact, of the wire outlet end connecting strip.

In one embodiment, the second drive assembly further comprises a thermally deformable strip; the thermal deformation strip is arranged between the traction rod and the second push rod;

the thermal deformation strip is vertically arranged, the bottom of the thermal deformation strip is fixed at one end, far away from the static contact, of the wire outlet end connecting strip through the heat conduction piece, and the top of the thermal deformation strip is fixedly connected with the top of the traction rod.

In one specific embodiment, the device further comprises a third transmission assembly;

the third transmission assembly comprises a rebutch, a lock catch, a jump buckle, a first linkage block, a second linkage block and a rotating shaft;

the top of the first push rod can be pressed against the bottom of the rebuckling;

the top of the second push rod can be pressed against the bottom of the rebuckling;

the top of the lock catch is rotationally connected to the top of the rebuckling through a third rotating shaft and a third torsion spring, and the bottom of the lock catch is in locking connection with one end of the jump buckle;

the top of the first linkage block is rotatably connected with the middle part of the jump buckle, and the bottom of the first linkage block is fixedly connected with the top of the second linkage block;

the bottom of the second linkage block is rotationally connected with the rotating shaft;

the rotating shaft is fixedly connected with one end of the moving contact far away from the static contact.

The circuit breaker with the circuit breaking mechanism based on the same conception comprises a shell, a contact mounting box, a wire inlet end connecting strip and the circuit breaking mechanism provided by any one of the specific embodiments;

the contact mounting box is fixed in the middle of the shell;

the wire inlet end connecting strip is arranged on the right side in the shell, and the left end of the wire inlet end connecting strip is fixedly connected with the right side of the contact mounting box;

the outlet end connecting strip and the static contact are arranged on the left side in the shell; the right end of the static contact is fixedly connected with the left side of the contact mounting box, and the left end of the static contact is fixedly connected with the right end of the wire outlet end connecting strip;

the moving contact is arranged in the contact mounting box.

In one specific embodiment, the arc extinguishing device further comprises a handle and an arc extinguishing component;

the handle is arranged above the contact mounting box, the bottom of the handle is in transmission connection with the moving contact, and the top of the handle penetrates through the top end of the shell and extends to the outside of the shell;

the arc extinguishing subassembly is two, and one of them is located the left side of contact mounting box, and another locates the right side of contact mounting box.

The invention has the beneficial effects that: according to the circuit breaking mechanism, the fixed contact and the movable contact are arranged, when the fixed contact is contacted with the movable contact, the whole circuit is communicated, and normal current flows through the circuit. When the line is short-circuited, the short-circuit current flows through the fixed contact and the outlet end connecting strip in sequence. When the short-circuit current is small, the short-circuit current can excite the second electromagnetic driving unit to start working, and the second electromagnetic driving unit can drive the moving contact to rotate so as to separate the moving contact from the static contact, so that the task of breaking the short-circuit current is completed. When the short-circuit current is large, the short-circuit current can excite the first electromagnetic driving unit to start working, and the first electromagnetic driving unit can drive the moving contact to rotate so as to separate the moving contact from the static contact, so that the task of breaking the short-circuit current is completed. The first electromagnetic driving unit and the second electromagnetic driving unit are mutually cooperated, have the function of double instantaneous protection, are suitable for breaking of large and small short-circuit currents, effectively improve the breaking capacity of the breaking mechanism, and enable the breaking reliability of the breaking mechanism to be high and the breaking capacity to be excellent. Moreover, the structure is compact on the whole, the occupation of space is reduced, and the miniaturization design of the circuit breaker is facilitated.

Drawings

Fig. 1 is a top view of an embodiment of a circuit breaker having a circuit interrupting mechanism according to the present invention;

fig. 2 is a cross-sectional view a-a of the circuit breaker with the disconnect mechanism shown in fig. 1;

FIG. 3 is a partial enlarged view of area B in FIG. 2;

fig. 4 is a schematic structural diagram of an embodiment of a first stationary core in the circuit breaker with the breaking mechanism shown in fig. 1;

fig. 5 is a schematic structural diagram of an embodiment of a first plunger in the circuit breaker with the trip mechanism shown in fig. 1;

fig. 6 is a schematic structural diagram of an embodiment of a first transmission assembly in the circuit breaker with the breaking mechanism shown in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "top," "bottom," "inner," "outer," "axis," "circumferential," and the like are used in the positional or orientational relationships shown in the drawings to facilitate the description of the invention or to simplify the description, and are not intended to indicate or imply that the system or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "secured," "engaged," "hinged," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1, 2, 3, 4, 5 and 6, as an embodiment of the present invention, the circuit breaking mechanism includes a fixed contact 110, a movable contact (not shown), a terminal strip 120, a first electromagnetic driving unit and a second electromagnetic driving unit. One end of the fixed contact 110 is abutted against one end of the movable contact, and the other end is fixedly connected with one end of the line outlet end connecting strip 120. The connecting ends of the fixed contact 110 and the outlet end connecting strip 120 are wound on the first electromagnetic driving unit. A second electromagnetic driving unit is fixed at one end of the outlet end connecting strip 120 far away from the fixed contact 110. The first electromagnetic driving unit and the second electromagnetic driving unit are both in transmission connection with one end of the moving contact far away from the fixed contact 110. The first and second electromagnetic driving units can separate the moving contact from the stationary contact 110.

In this embodiment, when the fixed contact 110 is in contact with the movable contact, the whole circuit is connected, and normal current flows through the circuit. When a short circuit occurs in the line, the short circuit current flows through the fixed contact 110 and the outlet terminal connecting strip 120 in sequence. The short circuit current may excite the first electromagnetic driving unit and the second electromagnetic driving unit to start operating. Specifically, when the short-circuit current is small, the short-circuit current may excite the second electromagnetic driving unit to start working, and the second electromagnetic driving unit may drive the moving contact to rotate so as to separate the moving contact from the stationary contact 110, thereby completing the task of breaking the short-circuit current. When the short-circuit current is large, the short-circuit current can excite the first electromagnetic driving unit to start working, and the first electromagnetic driving unit can drive the moving contact to rotate so as to separate the moving contact from the static contact 110, thereby completing the task of breaking the short-circuit current. The first electromagnetic driving unit and the second electromagnetic driving unit are mutually cooperated, have the function of double instantaneous protection, are suitable for breaking of large and small short-circuit currents, effectively improve the breaking capacity of the breaking mechanism, and enable the breaking reliability of the breaking mechanism to be high and the breaking capacity to be excellent. Moreover, the structure is compact on the whole, the occupation of space is reduced, and the miniaturization design of the circuit breaker is facilitated.

Referring to fig. 3, 4, 5 and 6, in an embodiment of the present invention, the first electromagnetic driving unit includes a first stationary core 131, a first movable core 132 and a first transmission assembly 133. Wherein, the ends of the fixed contact 110 connected with the outlet end connecting strip 120 are wound on the first fixed iron core 131. When a large short-circuit current flows through the stationary contact 110 and the outlet terminal connecting bar 120, the first stationary core 131 generates an electromagnetic attraction force according to the electromagnetic generating principle. Here, the first stationary core 131 is fixed in the housing 180 at a constant position. The first movable core 132 is a plate-shaped structure, and is disposed right above the first stationary core 131, and one side of the first movable core is pressed against the first transmission assembly 133. Here, it should be noted that the left side of the first movable iron core 132 is pressed against the first transmission assembly 133, and the right side is fixed in the housing 180 through the rotating shaft and the torsion spring. Wherein, the first transmission assembly 133 is in transmission connection with the movable contact. The electromagnetic attraction generated by the first stationary core 131 drives the first movable core 132 to press against one side of the first transmission assembly 133 to rotate towards the first stationary core 131, and the rotating first movable core 132 drives the movable contact to rotate through the first transmission assembly 133, so that the movable contact is separated from the stationary contact 110, and the short-circuit current is disconnected.

Specifically, the first stationary core 131 is integrally of a "U" shape, and includes a first magnetic conductive rod and a first magnetic conductive plate. Here, the first magnetic conductive plate, the first magnetic conductive rod, and the first movable iron core 132 are made of iron. Wherein, the first magnetic conduction plate is disposed opposite to the first movable iron core 132. Moreover, the first magnetic conductive plate is disposed below the connecting end of the fixed contact 110 and the outlet end connecting strip 120, and the first movable iron core 132 is disposed above the connecting end of the fixed contact 110 and the outlet end connecting strip 120. The first magnetic conduction pole is two, and equal vertical setting, the top face that the bottom all was fixed in first magnetic conduction board, and the top all moves iron core 132 towards first. A preset distance is reserved between the top end surface of the first magnetic conducting rod and the bottom end surface of the first movable iron core 132. One end of the fixed contact 110 connected with the outlet end connecting strip 120 is wound on one of the first magnetic conducting rods; one end of the outlet end connecting strip 120 connected with the fixed contact 110 is wound on the other first magnetic conducting rod. In some embodiments, the first magnetic conducting rod is a screw, two threaded holes are formed in the first magnetic conducting plate, and the bottom of the first magnetic conducting rod is fixed to the first magnetic conducting plate through the threaded holes. As a whole, it is advantageous for the first stationary core 131 to generate electromagnetic attraction force. And moreover, the structure is compact, the layout is reasonable, the occupation of space is effectively reduced, and the miniaturization design is favorably realized.

In an embodiment of the present invention, the first transmission assembly 133 includes a support plate 1331, a first push rod 1332, a connection rod 1333 and a drive rod 1334. The number of the supporting plates 1331 is two, and the two supporting plates are a first supporting plate and a second supporting plate. The first support plate and the second support plate can effectively support and fix the first push rod, the connecting rod and the driving rod. Here, it should be noted that the first support plate and the second support plate are both fixed in the housing 180. The first support plate is located at the front side in the housing 180, the second support plate is located at the rear side in the housing 180, and the first movable iron core 132 is located at the front side of the first support plate. The first supporting plate and the second supporting plate are arranged oppositely. The mounting grooves are formed in the first supporting plate and the second supporting plate. Two first push rods 1332 are provided, and are both obliquely arranged. One of the first push rods 1332 is disposed at a side of the first support plate close to the second support plate, that is, one of the first push rods is disposed at a rear side of the first support plate, and a bottom of the first push rod is rotatably connected to the first support plate through a first rotating shaft and a first torsion spring. Another first push rod 1332 is disposed on a side of the second support plate away from the first support plate, that is, another first push rod is disposed at the rear side of the second support plate, and the bottom of the another first push rod is rotatably connected to the second support plate through a second rotating shaft and a second torsion spring. Wherein, connecting rod 1333 is one, locates between first backup pad and the second backup pad, and one end is located the mounting groove of first backup pad, and with the bottom fixed connection of one of them first push rod, and the other end is located the mounting groove of second backup pad, and with the bottom fixed connection of another first push rod. The actuating lever 1334 is one, locates the one side that first backup pad deviates from the second backup pad, and one end and the one end fixed connection that the connecting rod is located the mounting groove of first backup pad, promptly, the front side of first backup pad is located to the actuating lever, and the front end fixed connection of rear end and connecting rod, its lateral wall and one side looks butt of first movable iron core 132. Therefore, when a single-phase short circuit occurs, a first short circuit current is generated, the first short circuit current enables the first stationary iron core 131 to generate a first electromagnetic attraction, and the first electromagnetic attraction drives the first movable iron core 132 to rotate so as to drive the driving rod 1334 to rotate, thereby driving the connecting rod 1333 and the first push rod 1332 to rotate. The tops of the two first push rods 1332 are mutually matched to push the rebutch 151 of the third transmission mechanism to rotate together, so as to separate the moving contact head from the fixed contact head 110. The rebuckling 151 is driven to rotate by the two first push rods 1332, so that the driving stability and reliability are greatly improved. When the three phases are short-circuited, a second short-circuit current is generated, and the second short-circuit current enables the first stationary iron core 131 to generate a second electromagnetic attraction, where the second electromagnetic attraction is three times of the first electromagnetic attraction, and the second electromagnetic attraction drives the first movable iron core 132 to rotate, so as to drive the driving rod 1334 to rotate, and further drive the connecting rod 1333 and the first push rod 1332 to rotate. Because the second electromagnetic attraction is three times that of the first electromagnetic attraction, a larger driving force can be provided for the first movable iron core 132, so that the first movable iron core 132 rotates faster, and further the movable contact and the fixed contact 110 are separated faster. And when three-phase short circuit occurs, the breaking consistency is good, and the method is suitable for breaking large short-circuit current. In addition, the driving rod 1334, the connecting rod 1333 and the push rod 1332 are integrally formed, thereby facilitating installation.

In an embodiment of the present invention, the second electromagnetic driving unit includes a second stationary core 141, a second movable core 142 and a second transmission assembly 143. The second stationary core 141 is fixed to an end of the outlet end connecting bar 120 away from the stationary contact 110. When a small short-circuit current flows through the outlet terminal connecting bar 120, the second stationary core 141 generates an electromagnetic attraction force according to the electromagnetic generating principle. Here, second stationary core 141 is fixed in case 180 at a constant position. The second movable core 142 has a plate-like structure, is disposed directly above the second stationary core 141, and is rotatable toward the second stationary core 141. The second transmission assembly 143 is integrally disposed above the second movable core 142, and includes an armature bar 1431, a drawbar 1432, and a second push rod 1433. The bottom of the armature bar 1431 is fixed to the top end face of the second movable iron core 142. Here, it should be noted that the armature bar 1431 is a structure in which the middle portion is arched toward the relocking 151 of the third transmission mechanism, and the left side thereof is fixedly connected to the upper portion in the housing 180 by a tension spring, and the lower portion is rotatably connected to the housing 180. The draw bar 1432 is obliquely disposed, the bottom is rotationally coupled to the top of the armature bar 1431 via a second pivot and a second torsion spring, and the bottom of the draw bar 1432 and the top of the armature bar 1431 are rotationally coupled to the housing 180 via a second pivot. The top of the pull rod 1432 faces the rebuckling 151 and is provided with a buckling part. The second push rod 1433 is also obliquely arranged, and the top of the second push rod 1433 is also provided with a buckling part which is buckled with the top of the traction rod 1432 and the top of the second push rod 1433. Here, it should be noted that the second push rod 1433 has an arc structure, the protruding side is disposed near the rebutch 151 of the third transmission mechanism, and the bottom is fixed in the housing 180 through the rotating shaft and the torsion spring. The top of the second push rod 1433 can drive the movable contact to rotate. Specifically, when a short circuit occurs, a small short circuit current flows through the outlet terminal connecting bar 120, and the small short circuit current causes the second stationary core 141 to generate an electromagnetic attraction force to drive the second movable core 142 and the armature bar 1431 to rotate, so as to drive the draw bar 1432 to rotate, the top of the draw bar 1432 moves upward, at this time, the top of the draw bar 1432 and the top of the second push rod 1433 are separated from each other, the top of the second push rod 1433 moves toward the relocking 151 of the third transmission mechanism, and the relocking 151 is driven to rotate, so as to separate the movable contact and the stationary contact 110 from each other.

Specifically, the second stationary core 141 is integrally of a "U" shaped structure, and includes a second magnetic conductive rod and a second magnetic conductive plate. Here, the second magnetic conductive rod, the second movable iron core 142, and the second magnetic conductive plate are made of iron. Wherein, the second magnetic conducting plate is disposed opposite to the second movable iron core 142. Moreover, the second magnetic conductive plate is disposed below one end of the outlet end connecting strip 120 away from the fixed contact 110, and the second movable iron core 142 is disposed above one end of the outlet end connecting strip 120 away from the fixed contact 110. The two second magnetic conducting rods are vertically arranged, the bottoms of the two second magnetic conducting rods are fixed on the top end surface of the second magnetic conducting plate, the tops of the two second magnetic conducting rods face the second movable iron core 142, and the middle portions of the two second magnetic conducting rods are fixed at one end, far away from the static contact 110, of the leading-out end connecting strip 120. In some embodiments, the second magnetic conducting rod is also a screw, two threaded holes are also formed in the second magnetic conducting plate, and the bottom of the second magnetic conducting rod is fixed to the second magnetic conducting plate through the threaded holes.

In an embodiment of the present invention, the second transmission assembly 143 further includes a thermally deformable strip 1434, and the thermally deformable strip 1434 is disposed between the draw bar 1432 and the second push rod 1433. Here, the thermally deformable strip 1434 is integrally provided at a front side of the second push rod 1433, and is a bimetal strip that is deformed when heated. The thermally deformable strip 1434 is vertically disposed, and the bottom of the thermally deformable strip is fixed to an end of the outlet end connecting strip 120 away from the stationary contact 110 through a heat conduction member 1435, and the top of the thermally deformable strip is fixedly connected to the top of the drawbar 1432. When a small short-circuit current flows through the end of the outlet terminal connecting bar 120 away from the stationary contact 110, the outlet terminal connecting bar 120 generates heat and transfers the heat to the thermal deformation bar 1434 through the thermal conductor 1435. The thermally deformed strip 1434 is arched in the middle toward the left to move the top of the draw bar 1432 toward the left, thereby separating the top of the draw bar 1432 from the top of the second push rod 1433. Thereafter, the top of the second push rod 1433 moves towards the re-catch 151 of the third transmission mechanism, so that the movable contact is separated from the stationary contact 110. When the short-circuit current flowing through the end of the outlet terminal connecting bar 120 away from the stationary contact 110 is more than 1.3 times of the normal current, the pull rod 1432 is driven to rotate by the thermal deformation sheet so as to separate the pull rod 1432 from the second push rod 1433; when the short-circuit current flowing through the end of the outlet terminal connecting bar 120 away from the stationary contact 110 is more than 6 times of the normal current, the pull rod 1432 is driven to rotate by the armature bar 1431 so as to separate the pull rod 1432 from the second push rod 1433. On the whole, first electromagnetic drive unit and second electromagnetic drive unit cooperate, have improved the disjunction ability of mechanism of breaking a circuit greatly. The second electromagnetic driving unit comprises two modes of driving the moving contact to rotate, and the breaking capacity of the circuit breaking mechanism is further improved. Specifically, the second stationary core 141, the second movable core 142 and the armature bar 1431 of the second electromagnetic driving unit are engaged, and can drive the draw bar 1432 to rotate and release the second push rod 1433. The heat conductor 1435 and the heat deformation bar 1434 of the second electromagnetic driving unit are matched to drive the rotation of the drawing bar 1432 and release the second push rod 1433. The second transmission mechanism adopts a mode that two driving modes are matched to drive the draw bar 1432 to rotate so as to release the second push rod 1433 to work, so that the second transmission mechanism is suitable for breaking of more short-circuit currents. In addition, the overall structure of the second electromagnetic driving unit is compact, and the space is saved. The force finally output by the three-phase snap protection acts on the same draw bar 1432, so that the draw bar 1432 is separated from the second push bar 1433, and the separating force depends on the spring force of the second push bar 1433, namely, the three-phase snap protection has an advantage in small current breaking. In addition, the instantaneous protection and delay structure realizes the integrated modular design, and is convenient to disassemble, replace, install and use.

In a specific embodiment of the present invention, the circuit interrupting mechanism further includes a third drive assembly. The third driving assembly includes a rebuckling 151, a locking buckle 152, a jump buckle 153, a first linkage block 154, a second linkage block 155, and a rotation shaft. The top of the first push rod can press against the bottom of the rebuckle 151. The top of the second push rod 1433 can also be pressed against the bottom of the rebuckling 151. The top of the lock catch 152 is rotatably connected to the top of the relocking 151 through a third rotating shaft and a third torsion spring, and the bottom is connected to one end of the jump buckle 153 in a locking manner. Here, it should be noted that the top of the locking buckle 152 and the top of the re-buckle 151 are rotatably connected to the housing 180 through a third rotating shaft. The top of the first linkage block 154 is rotatably connected with the middle of the jump buckle 153, and the bottom is fixedly connected with the top of the second linkage block 155. The bottom of the second linkage block 155 is rotatably connected to the rotation shaft. The rotating shaft is fixedly connected with one end of the moving contact far away from the static contact. Thus, the rebuckling 151 is pushed to rotate by the first push rod or the second push rod 1433, so that the lock 152 overlapped on the rebuckling 151 rotates to release the trip 153, and the trip 153 drives the first linkage block 154, the second linkage block 155 and the rotating shaft to rotate, thereby rotating the moving contact. The moving and static contacts 110 are separated from each other to perform the function of breaking current, so that the protection function of the circuit is enhanced. The whole structure is compact, the precision is high, the working efficiency is high, and the breaking effect is stable.

The invention also provides a circuit breaker with the circuit breaking mechanism, which comprises a shell 180, a contact mounting box 160, a line inlet end connecting bar 170, a handle, an arc extinguishing assembly 190 and the circuit breaking mechanism provided by any one of the embodiments. The case 180 can enhance protection of the electric components fixed therein. The contact mounting box 160 is fixed in the middle of the housing 180, the incoming line terminal connecting strip 170 is arranged on the right side of the housing 180, and the left end is fixedly connected with the right side of the contact mounting box 160. The outlet end connecting strip 120 and the static contact 110 are both arranged on the left side in the housing 180, the right end of the static contact 110 is fixedly connected with the left side of the contact mounting box 160, and the left end is fixedly connected with the right end of the outlet end connecting strip 120. The movable contacts and the rotating shaft are provided in the contact mounting box 160. The stationary contact 110 is mounted to the left side of the contact mounting box 160 through an instrument. The handle is arranged above the contact mounting box 160, the bottom of the handle is in transmission connection with the movable contact, and the top of the handle penetrates through the top end of the shell 180 and extends to the outside of the shell 180. The handle can directly drive the trip 153 to move so as to drive the rotating shaft and the moving contact to rotate, thereby being convenient for personnel to operate. The arc extinguishing members 190 are two, one of which is disposed on the left side of the contact mounting box 160, and the other is disposed on the right side of the contact mounting box 160. The arc extinguishing assembly 190 can eliminate electric arcs generated when the moving contact and the fixed contact 110 are connected and in the process of breaking current, and the possibility that the electric arcs damage electrical elements is reduced.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," "one specific embodiment," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the scope of the present invention by equivalent replacement or change according to the technical solution and the inventive concept of the present invention within the scope of the present disclosure.

Claims (8)

1. A circuit interrupting mechanism, comprising:

the device comprises a static contact, a moving contact, a wire outlet end connecting strip, a first electromagnetic driving unit and a second electromagnetic driving unit;

one end of the static contact is abutted against one end of the moving contact, and the other end of the static contact is fixedly connected with one end of the leading-out terminal connecting strip;

the connecting ends of the fixed contact and the outlet end connecting strip are wound on the first electromagnetic driving unit;

a second electromagnetic driving unit is fixed at one end of the outlet end connecting strip, which is far away from the static contact;

the first electromagnetic driving unit and the second electromagnetic driving unit are in transmission connection with the moving contact; the first electromagnetic driving unit and the second electromagnetic driving unit can enable the moving contact to be separated from the fixed contact;

the first electromagnetic driving unit comprises a first static iron core, a first movable iron core and a first transmission assembly;

one end of the static contact, which is connected with the leading-out end connecting strip, is wound on the first static iron core;

the first movable iron core is of a plate-shaped structure, is arranged right above the first static iron core, and one side of the first movable iron core is pressed against the first transmission assembly and can rotate towards the first static iron core;

the first transmission component is in transmission connection with the moving contact;

the first transmission assembly comprises a supporting plate, a first push rod, a connecting rod and a driving rod;

the number of the supporting plates is two, and the two supporting plates are respectively a first supporting plate and a second supporting plate; the first supporting plate and the second supporting plate are arranged oppositely; mounting grooves are formed in the first supporting plate and the second supporting plate;

the number of the first push rods is two, and the first push rods are obliquely arranged; one of the first support plate and the second support plate is arranged on one side of the first support plate close to the second support plate, and the bottom of the first support plate is rotatably connected with the first support plate through a first rotating shaft and a first torsion spring; the other one is arranged on one side of the second support plate, which is far away from the first support plate, and the bottom of the other one is rotationally connected with the second support plate through a second rotating shaft and a second torsion spring;

the connecting rod is one and is arranged between the first supporting plate and the second supporting plate, one end of the connecting rod is positioned in the mounting groove of the first supporting plate and is fixedly connected with the bottom of one of the first push rods, and the other end of the connecting rod is positioned in the mounting groove of the second supporting plate and is fixedly connected with the bottom of the other first push rod;

the actuating lever is one, locates first backup pad deviates from one side of second backup pad, one end with the connecting rod is located first backup pad one end fixed connection in the mounting groove, the lateral wall with one side looks butt of first movable iron core.

2. The circuit interrupting mechanism according to claim 1, wherein said first stationary core is generally "U" shaped and includes a first magnetically conductive rod and a first magnetically conductive plate;

the first magnetic conduction plate is opposite to the first movable iron core;

the two first magnetic conduction rods are vertically arranged, the bottoms of the two first magnetic conduction rods are fixed on the top end surface of the first magnetic conduction plate, and the tops of the two first magnetic conduction rods face the first movable iron core;

one end of the static contact, which is connected with the outlet end connecting strip, is wound on one of the first magnetic conducting rods; and one end of the outlet end connecting strip, which is connected with the fixed contact, is wound on the other first magnetic conducting rod.

3. The circuit interrupting mechanism of claim 1 wherein said second electromagnetic drive unit includes a second stationary core, a second movable core and a second transmission assembly;

the second static iron core is fixed at one end of the leading-out end connecting strip, which is far away from the static contact;

the second movable iron core is of a plate-shaped structure, is arranged right above the second static iron core and can rotate towards the second static iron core;

the second transmission assembly is integrally arranged above the second movable iron core and comprises an armature bar, a traction bar and a second push rod;

the bottom of the armature bar is fixed on the top end face of the second movable iron core;

the traction rod is obliquely arranged, the bottom of the traction rod is rotationally connected with the top of the armature bar through a second rotating shaft and a second torsion spring, and the top of the traction rod is provided with a buckling part;

the second push rod is also obliquely arranged, the buckling part is also arranged at the top of the second push rod, and the top of the traction rod and the top of the second push rod are buckled and connected through the buckling part; the top of the second push rod can drive the moving contact to rotate.

4. The circuit interrupting mechanism of claim 3 wherein said second stationary core is generally "U" shaped and includes a second magnetically permeable rod and a second magnetically permeable plate;

the second magnetic conduction plate is opposite to the second movable iron core;

the two second magnetic conducting rods are vertically arranged, the bottoms of the two second magnetic conducting rods are fixed on the top end surface of the second magnetic conducting plate, the tops of the two second magnetic conducting rods face the second movable iron core, and the middle portions of the two second magnetic conducting rods are fixed at one end, far away from the fixed contact, of the leading-out end connecting strip.

5. The disconnect mechanism of claim 3, wherein the second transmission component further comprises a thermally deformable strip; the thermal deformation strip is arranged between the traction rod and the second push rod;

the thermal deformation strip is vertically arranged, the bottom of the thermal deformation strip is fixed at one end, far away from the static contact, of the outgoing line end connecting strip through the thermal conduction piece, and the top of the thermal deformation strip is fixedly connected with the top of the traction rod.

6. The disconnect mechanism of claim 3, further comprising a third transmission assembly;

the third transmission assembly comprises a rebutch, a lock catch, a jump buckle, a first linkage block, a second linkage block and a rotating shaft;

the top of the first push rod can be pressed against the bottom of the rebuckling;

the top of the second push rod can be pressed against the bottom of the rebuckling;

the top of the lock catch is rotationally connected to the top of the relocking through a third rotating shaft and a third torsion spring, and the bottom of the lock catch is in locking connection with one end of the jump buckle;

the top of the first linkage block is rotatably connected with the middle of the jump buckle, and the bottom of the first linkage block is fixedly connected with the top of the second linkage block;

the bottom of the second linkage block is rotationally connected with the rotating shaft;

the rotating shaft is fixedly connected with one end of the moving contact far away from the static contact.

7. A circuit breaker having a breaking mechanism, comprising a housing, a contact mounting box, a line inlet terminal connection bar and the breaking mechanism of any one of claims 1 to 6;

the contact mounting box is fixed in the middle of the shell;

the wire inlet end connecting strip is arranged on the right side in the shell, and the left end of the wire inlet end connecting strip is fixedly connected with the right side of the contact mounting box;

the outlet end connecting strip and the static contact are arranged on the left side in the shell; the right end of the static contact is fixedly connected with the left side of the contact mounting box, and the left end of the static contact is fixedly connected with the right end of the wire outlet end connecting strip;

the moving contact is arranged in the contact mounting box.

8. The circuit breaker having a disconnect mechanism of claim 7, further comprising a handle and an arc extinguishing assembly;

the handle is arranged above the contact mounting box, the bottom of the handle is in transmission connection with the moving contact, and the top of the handle penetrates through the top end of the shell and extends to the outside of the shell;

the arc extinguishing components are two, one of the arc extinguishing components is arranged on the left side of the contact mounting box, and the other arc extinguishing component is arranged on the right side of the contact mounting box.

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