breaker

Abstract

A circuit breaker comprises a bracket and a jumper, a lock, a re-fastener and a rocker arm pivotally mounted on the bracket, the rocker arm is provided with a main spring and a handle, the jumper and the re-fastener are respectively overlapped and matched with the lock, the re-fastener is matched with a tripping mechanism, the jumper and the main spring are connected with a connecting rod, the connecting rod is connected with a moving contact assembly, and when the re-fastener is unlocked with the lock, the lock and the jumper are unlocked, and a reaction spring connected with the jumper is provided on the bracket, and the direction of the reaction spring force is the same as the unlocking direction of the jumper. By setting the reaction spring in the same unlocking direction as the jumper, the circuit breaker not only has the characteristics of simple structure and convenient buckling, but also can be quickly unlocked with the jumper, thereby improving the tripping speed of the operating mechanism.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a circuit breaker. Background Art

[0002] Circuit breakers are used to connect, disconnect and carry normal working current in power distribution networks, and can cut off power supply in the event of overload, short circuit, undervoltage and ground fault in the line or electrical equipment to protect the line or electrical equipment from damage. Among them, short circuit fault is the most serious. Once a short circuit overcurrent occurs, if the circuit breaker overcurrent protection device fails to quickly cut off the power supply in time, it will bring huge harm and losses to personal safety and property economy, and will also cause damage to the circuit breaker itself.

[0003] The operating mechanism of the existing circuit breaker usually uses the energy storage mechanism to provide the power for tripping. By increasing the force value of the main energy mechanism, although the tripping speed can be improved to a certain extent, the energy of the short-circuit current can be reduced, the damage to the molded case circuit breaker itself can be reduced, and its operation can be more reliable, it aggravates the fatigue loss of other components (such as handles, connecting rods, etc.) and the energy storage mechanism itself, thereby reducing the service life of the molded case circuit breaker. At the same time, it will also increase the opening and closing force of the molded case circuit breaker, affecting the operating feel. Summary of the invention

[0004] The object of the present invention is to overcome the defects of the prior art and provide a tripping device for a circuit breaker with a simple structure and high reliability.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A circuit breaker comprises a bracket and a tripping catch 210, a locking catch 220, a re-fastening piece 230 and a rocker arm 241 pivotally mounted on the bracket, the rocker arm 241 being provided with a main spring 242 and a handle 250, the tripping catch 210 and the re-fastening piece 230 being overlapped and matched with the locking catch 220 respectively, the re-fastening piece 230 being matched with a tripping mechanism 100, the tripping catch 210 and the main spring 242 being connected with a connecting rod, the connecting rod being connected with a moving contact assembly 400, when the re-fastening piece 230 is unlocked with the locking catch 220, the locking catch 220 is triggered to unlock with the tripping catch 210, a reaction spring 280 connected with the tripping catch 210 is provided on the bracket, and the direction of the force of the reaction spring 280 is the same as the unlocking direction of the tripping catch 210.

[0007] Optionally, the connecting rod includes an upper connecting rod 260 hinged to the jumper 210, and a lower connecting rod 270 connected to the moving contact assembly 400, the upper connecting rod 260 and the lower connecting rod 270 are hinged through a connecting rod pivot 2670, one end of the main spring 242 is connected to the rocker arm 241, and the other end is connected to the connecting rod pivot 2670, the center point of the connecting rod pivot 2670 is located at point B' in free tripping, at point B in opening, and at point B" in closing, B' is located above between B and B", and ∠BB'B" is set at an obtuse angle.

[0008] Optionally, the rocker arm 241 includes two oppositely arranged side plates 243, and a top plate 244 connected to the top ends of the two side plates 243, the top end of the top plate 244 is fixedly connected to the handle 250, and one side is provided with a main pull rod 246 hinged to the main spring 242, and the two side plates 243 are provided with a rocker shaft 245 that cooperates with the jump catch 210 on the side away from the main pull rod 246, and the reaction spring 280 makes the jump catch 210 press against the rocker shaft 245, and the two ends of the rocker shaft 245 are respectively fixedly connected to the inner sides of the two side plates 243.

[0009] Optionally, the reaction spring 280 includes torsion springs 281 relatively arranged on both sides of the tripping member 210, the torsion springs 281 are sleeved on the locking shaft 220b, one end of the two torsion springs 281 is connected by a connecting rod 284, and the connecting rod 284 is against the side of the tripping member 210 away from the locking member 220, and the direction of the force of the reaction spring 280 is the same as the rotation direction of the tripping member 210 when tripping.

[0010] Optionally, the locking member 220 is pivotally mounted on a locking shaft 220 b , and a locking reset spring 224 connected to the locking member 220 is provided on the locking shaft 220 b .

[0011] Optionally, the locking member 220 includes two oppositely arranged locking arms 221 and a locking plate 222 connected between the two locking arms 221, one end of the two locking arms 221 is sleeved on the locking shaft 220b, and the other end is overlapped with the re-fastening member 230, and the bottom side of the locking plate 222 is provided with a locking groove 223 overlapped with the jump fastener 210, and the connecting rod 284 of the reaction spring 280 passes through the locking groove 223 and extends to the bottom of the jump fastener 210.

[0012] Optionally, the bracket is provided with an assembly hole 204, and an assembly shaft that is matched with the reaction spring 280 during assembly is provided in the assembly hole 204.

[0013] Optionally, the bracket includes two cheek plates 201 arranged opposite to each other, and a positioning groove 202 cooperating with the rocker arm 241 is provided in the middle of the cheek plate 201; the cheek plate 201 is provided with a jump buckle shaft 210b and a lock buckle shaft 220b on both sides of the positioning groove 202, respectively, and the lock buckle 220 is arranged on the inner side of the two cheek plates 201 and the bottom end of the lock buckle 220 is pivotally mounted on the lock buckle shaft 220b, the middle part overlaps with the jump buckle 210, and the top end overlaps with the re-fastener 230; the left end of the jump buckle 210 is arranged on the inner side of the two cheek plates 201 and pivotally mounted on the lock buckle shaft 220b. It is installed on the tripping shaft 210b, with the middle part arranged between the two side plates 243 and hinged with the upper connecting rod 260, and the right end is swingably arranged below the rocker shaft 245 of the rocker arm 241, and the middle part of the locking member 220 can be swung to between the right end of the tripping member 210 and the rocker shaft 245 to overlap and lock with the tripping member 210; the locking member 230 is arranged on the inner side of the two cheek plates 201 and is pivotally installed above the locking shaft 220b, with one end overlapping and cooperating with the top end of the locking member 220, and the other end extending out of the cheek plate 201 to cooperate with the tripping mechanism 100.

[0014] Optionally, the jumper 210 includes a connecting portion 211 and a lap portion 212 and a pivot portion 213 arranged on both sides of the connecting portion 211, the pivot portion 213 is pivotally mounted on the bracket, the connecting portion 211 is hinged to the upper connecting rod 260 through the upper connecting rod shaft 260b, a lap boss 214 extending into the lock groove 223 of the lock member 220 is provided on the lap portion 212, a jumper groove 215 overlapped with the lock groove 223 is formed on the top side of the lap boss 214, and the bottom of the lap boss 214 is A reaction groove 284b is formed on the side to cooperate with the connecting rod 284 of the reaction spring 280, and an upper connecting rod shaft hole is provided on the connecting portion 211 to cooperate with the upper connecting rod shaft 260b; the upper connecting rod 260 is two and is relatively arranged on both sides of the jump buckle 210, the main spring 242 is two and is respectively arranged on the outer sides of the two upper connecting rods 260 and connected to the middle part of the connecting rod pivot 2670, the upper connecting rod 260 and the lower connecting rod 270 are respectively arranged at the two ends of the connecting rod pivot 2670, and the upper connecting rod 260 forms a triangle. Each upper link 260 includes a first vertex 260A fixedly connected by an upper link pin 261, a second vertex 260B fixedly connected by an upper link shaft 260b, and a third vertex 260C respectively connected to the corresponding lower link 270 by a link pivot 2670, the upper link shaft 260b on the second vertex 260B is hinged to the jumper 210, the first vertex 260A is arranged on a side close to the pivot portion 213 of the jumper 210, and the third vertex 260C is arranged The re-fastening member 230 is arranged on the side of the locking member 220 away from the jumping member 210, and includes two oppositely arranged re-fastening arms 231, the re-fastening arms 231 are L-shaped, and the middle part of the re-fastening arms 231 is fixedly connected by a re-fastening plate 232, one end of the re-fastening arm 231 is provided with a re-fastening claw 233 which overlaps and cooperates with the locking arm 221 of the locking member 220, and the other end is provided with a release arm 235 which extends to the outside of the cheek plate 201 and cooperates with the release mechanism 100.

[0015] Optionally, it also includes a unit housing 500 and a tripping mechanism 100, in which a relatively arranged static contact assembly 300 and a moving contact assembly 400 are provided, a connecting rod is connected to the moving contact assembly 400 to drive the moving contact assembly 400 to swing and contact the static contact assembly 300, an arc extinguishing mechanism 350 is provided above the static contact assembly 300, the tripping mechanism 100 includes a pushing member 110 and a tripping rod 120, and an air duct 101 cooperating with the pushing member 110 is provided in the unit housing 500.

[0016] The circuit breaker of the present invention, by providing a reaction spring 280 with the same unlocking direction as the tripping catch 210, not only has the characteristics of simple structure and convenient buckle, but also can be quickly unlocked with the tripping catch 210, thereby improving the tripping speed of the operating mechanism. In addition, the reaction spring 280 makes the tripping catch 210 abut against one side of the rocker arm 241 to provide resistance, so that the handle 250 is reliably kept in the position of the free tripping state, and the re-buckle force is increased to balance the closing and opening forces, and the operating feel of heavy closing force and light opening force is improved. At the same time, the tripping catch 210 is locked by the lock member 220 that can swing between the tripping catch 210 and the rocker arm 241, so that the structure is more compact and the cooperation is more reliable. In addition, the center point of the connecting rod pivot 2670 is respectively at positions B', B, B", and ∠BB'B" in the three states of free tripping, opening, and closing, and is set at an obtuse angle, which can ensure that the stretching amount of the main spring 242 of the energy storage mechanism 240 in the opening and closing states is basically the same, further ensuring that the opening force and the closing force are consistent, and improving the operating feel. In addition, the assembly shaft can be against the pin of the reaction spring 280 during assembly to prevent the reaction spring 280 from interfering with other mechanisms during the assembly process, reduce the difficulty of assembly, and improve assembly efficiency. After assembly, removing the assembly shaft will not interfere with the work of other mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the circuit breaker of the present invention;

[0018] Figure 2 is an exploded view of a circuit breaker unit of the present invention;

[0019] Figure 3 is a side view of the circuit breaker of the present invention;

[0020] Figure 4 is a top view of the circuit breaker of the present invention;

[0021] Figure 5 The present invention Figure 3 Section view along plane AA;

[0022] Figure 6 The present invention Figure 3 Section along plane BB;

[0023] Figure 7 The present invention Figure 3 Section along CC plane;

[0024] Figure 8 The present invention Figure 3 Section along DD plane;

[0025] Fig. 9 The present invention Figure 3 Section along DD plane;

[0026] Fig.10 It is a structural schematic diagram of the static contact assembly, arc extinguishing mechanism and arc blocking mechanism of the present invention;

[0027] Fig.11 It is a structural schematic diagram of the arc blocking mechanism of the present invention;

[0028] Fig.12 It is a partial structural schematic diagram of the operating mechanism of the circuit breaker of the present invention;

[0029] Fig.13 It is another partial structural schematic diagram of the operating mechanism of the circuit breaker of the present invention;

[0030] Fig.14 It is another partial structural schematic diagram of the operating mechanism of the circuit breaker of the present invention;

[0031] Fig.15 It is a structural schematic diagram of the reaction spring of the circuit breaker of the present invention;

[0032] Fig.16 It is a schematic diagram of the three states of free tripping, closing and opening of the circuit breaker of the present invention;

[0033] Fig.17 It is a structural schematic diagram of the fixed axis of the circuit breaker of the present invention. DETAILED DESCRIPTION

[0034] The following is combined with Figures 1 to 17 The embodiments given are used to further illustrate the specific implementation of the tripping device of the circuit breaker of the present invention. The tripping device of the circuit breaker of the present invention is not limited to the description of the following embodiments.

[0035] like Figure 1-5 As shown, an embodiment of a molded case circuit breaker includes a circuit breaker unit, an operating mechanism 200 arranged on the circuit breaker unit, and a tripping mechanism 100 that triggers the operating mechanism 200 to trip when a fault occurs. The molded case circuit breaker generally includes a plurality of circuit breaker units arranged side by side, each circuit breaker unit includes a unit housing 500, the unit housing 500 is provided with a relatively arranged static contact assembly 300 and a moving contact assembly 400, and an arc extinguishing mechanism 350 for extinguishing the arc on the static contact assembly 300 and the moving contact assembly 400, and the moving contact assemblies 400 of the plurality of circuit breaker units are linked and connected to the operating mechanism 200. The operating mechanism 200 can drive the moving contact assembly 400 to contact and separate with the static contact assembly 300 to realize the conduction and disconnection of the electrical circuit. The operating mechanism 200 will store energy and lock after driving the moving contact assembly 400 to contact with the static contact assembly 300. The tripping mechanism 100 can trigger the operating mechanism 200 to unlock and release energy when a short circuit overcurrent occurs. The operating mechanism 200 drives the moving contact assembly 400 to leave the static contact assembly 300 by releasing energy to disconnect the line and realize tripping.

[0036] Combination Figure 2-9 As shown, the unit housing 500 is composed of a combination of half housings 501 on the left and right sides, and an air passage 101 is provided on the inner side of the side wall of the unit housing 500 along the tripping direction of the moving contact assembly 400. The tripping mechanism 100 includes a pushing member 110 movably arranged in the air passage 101, and a tripping rod 120 swingably arranged outside the unit housing 500. One end of the tripping rod 120 cooperates with the pushing member 110, and the other end cooperates with the operating mechanism 200. When the short-circuit overcurrent passes through the static contact assembly 300 and the moving contact assembly 400, the high-energy arc generated by the disconnection of the static contact assembly 300 and the moving contact assembly 400 causes the gas in the unit housing 500 to expand rapidly. The expanded gas enters the air passage 101 and drives the pushing member 110 to move in the opposite direction to the tripping direction of the moving contact assembly 400, pushing the tripping rod 120 to trigger the operating mechanism 200 to unlock and drive the moving contact assembly to trip.

[0037] The tripping device of the circuit breaker of the present invention has the characteristics of simple structure, easy assembly and small space occupation by arranging the air passage 101 on the inner side of the unit housing 500, arranging the pushing member 110 in the air passage 101, and arranging the tripping rod 120 outside the unit housing 500 to cooperate with the pushing member 110. The air passage 101 can be arranged on both sides of the breakpoint at either end of the double-breakpoint circuit breaker, and the air passage can be arranged on both sides of the breakpoint at the incoming line end or the breakpoint at the outgoing line end. Moreover, the pushing member 110 pushes the tripping rod 120 to move in the direction opposite to the tripping direction of the moving contact assembly 400, so that the breaking speed is faster and the action is more reliable.

[0038] like Fig. 9As shown, the air channel 101 is Z-shaped, including a conversion channel 101b and an air inlet channel 101a and an air outlet channel 101c respectively connected to the two ends of the conversion channel 101b, and the pushing member 110 is arranged in the conversion channel 101b for sliding cooperation, and the air inlet channel 101a is arranged above the static contact assembly 300 along the tripping direction of the moving contact assembly 400, and is connected to the space between the moving contact 410 of the moving contact assembly 400 and the static contact 310 of the static contact assembly 300, and the air outlet channel 101c is arranged below the air inlet channel 101a, and one side of the static contact assembly 300 is connected to the outside of the unit housing 500, and the trip rod 120 extends from the air outlet channel 101c into the conversion channel 101b and cooperates with the pushing member 110. By shortening the distance between the air inlet channel 101a and the moving contact assembly 400 and the stationary contact assembly 300, when a short circuit overcurrent occurs, the air changes near the arc can be sensed more quickly, and a quicker response can be made to increase the breaking speed. Of course, the air inlet channel 101a, the conversion channel 101b and the air outlet channel 101c can be vertical or arranged at a certain angle, and the air channel 101 can also be L-shaped or arc-shaped, all of which belong to the protection scope of the present invention.

[0039] like Figure 8 As shown, the tripping rod 120 includes a pivoting arm 121 that is pivotally mounted, and a pushing arm 122 and a triggering arm 123 that are arranged at both ends of the pivoting arm 121. The pivoting arm 121 is rotatably pivoted and mounted on the unit housing 500 or the cheek plate 201 of the operating mechanism 200 through a rotating shaft 124. The triggering arm 123 cooperates with the operating mechanism 200. The pushing arm 122 extends into the air outlet channel 101c and cooperates with the pushing member 110. A step surface 126 that cooperates with the pushing arm 122 is provided in the air outlet channel 101c. The step surface 126 can prevent the tripping rod 120 from having an interference motion, resulting in failure to reset or motion interference with other parts. A reset power source 127 ( Figure 2 ), the reset power source 127 is preferably a torsion spring, one end of which is connected to the cheek plate 201 of the unit housing 500 or the operating mechanism 200, and the other end is connected to the torsion spring slot 125 on the pivot arm 121. Of course, the tripping rod 120 can also be installed without pivoting, and can move back and forth linearly, and the reset power source 127 can also be an elastic part such as a tension spring or a torsion spring. Before the triggering operating mechanism 200 is unlocked, the tripping rod 120 approaches the pusher 110 and rests in the airway 101 under the action of the reset power source 127, and can respond quickly when the pusher 110 moves, ensuring the sensitivity of the device. Moreover, after the operating mechanism 200 is unlocked and the tripping action is completed, the tripping rod 120 rotates counterclockwise under the action of the reset power source 127, and drives the pusher 110 to return to its initial state.

[0040] Furthermore, the pushing arm 122 of the trip rod 120 is perpendicular to the moving direction of the pushing member 110, that is, the air inlet channel 101a and the air outlet channel 101c are perpendicular to the side wall of the unit shell 500, and the conversion channel 101b is parallel to the side wall of the unit shell 500. The pushing member 110 moves vertically up and down in the conversion channel 101b under the action of the airflow or the trip rod 120. The vertical movement direction of the pushing member 110 is basically parallel to the action direction of the moving contact 410 of the moving contact assembly 400, so that the pushing member 110 vertically pushes the pushing arm 122 to move in the conversion channel 101b, which not only has a short stroke, high sensitivity, and fast breaking speed, but also has a more reliable transmission and more coordinated cooperation with the pushing arm 122.

[0041] Furthermore, the push arm 122 is arranged between two adjacent phases, and the push arm 122 is T-shaped. Its two sides can be respectively inserted into the air passages 101 of the two adjacent phases to cooperate with the two push members 110. The two phases share a tripping mechanism 100. When any short circuit overcurrent occurs, the common tripping rod 120 can be used to trigger the operating mechanism 200 to unlock. It has the characteristics of compact size and reduced cost. The present invention shows an intermediate phase of a three-phase circuit breaker, and of course it can also be applied to two-phase or single-phase circuit breakers, all of which belong to the protection scope of the present invention.

[0042] like Figure 6-9 As shown, an arc blocking mechanism 340 and an arc extinguishing mechanism 350 are provided above the static contact assembly 300. The arc blocking mechanism 340 and the inner wall of the unit housing 500 form the air duct 101. The arc blocking mechanism 340 not only protects the static contact assembly 300 from arc erosion, but also forms an air duct 101 with the unit housing 500 to cooperate with the tripping mechanism 100, thus killing two birds with one stone and having an ingenious design.

[0043] like Figure 7 , 10 An embodiment of the arc extinguishing mechanism 350 is shown. The arc extinguishing mechanism 350 includes two relatively arranged fixed plates 351, and a plurality of arc extinguishing grids 352 fixed in parallel between the two fixed plates 351. A reflection plate 354 is provided on the side of the arc extinguishing grid 352 close to the moving contact assembly 400, and a partition 353 is provided on the side of the arc extinguishing grid 352 away from the moving contact assembly 400. The unit housing 500 is provided with an exhaust port corresponding to the top of the partition 353, so that the arc is cut and extinguished by the arc extinguishing grid 352.

[0044] Furthermore, the reflecting plates 354 are relatively arranged on both sides of the static contact 310, and are obliquely arranged on one side of the arc blocking mechanism 340. The top of the reflecting plate 354 extends above the arc blocking mechanism 340, and the reflecting plate 354, the arc blocking mechanism 340 and the inner wall of the unit housing 500 form the airway 101. The reflecting plate 354, the arc blocking mechanism 340 and the inner wall of the unit housing 500 form the airway 101 ( Figure 6 ) at the same time, it can also play a role of protection and isolation to prevent arcing and burning of the two sides of the moving contact assembly 400 and the arc extinguishing mechanism 350. The reflector plate 354 is preferably a gas-producing material, which can quickly generate gas under the action of the electric arc. The gas is beneficial for blowing and extinguishing the arc, and is also beneficial for providing power for the pusher 110 of the pneumatic tripping mechanism.

[0045] Furthermore, it includes a plurality of arc-extinguishing grids 352 which are arranged in parallel at intervals above the static contact 310, and the arc-extinguishing grids 352 are provided with arc-extinguishing cuts 3521 corresponding to the static contact 310, and the two ends of the arc-extinguishing cuts 3521 are correspondingly arranged on both sides of the static contact 310, and two reflection plates 354 are fixedly connected to the two ends of the arc-extinguishing cuts 3521, respectively, which has the characteristics of simple and compact structure and easy assembly.

[0046] like Figure 10-11 An embodiment of the arc blocking mechanism 340 is shown. The arc blocking mechanism 340 includes an arc blocking cover 341 that cooperates with the contact plate 320 of the static contact assembly 300. The contact plate 320 of the static contact assembly 300 is provided with a static contact 310 that cooperates with the moving contact assembly 400. The arc blocking cover 341 is provided with an avoidance hole 342 that cooperates with the static contact 310. The arc blocking cover 341 is provided with arc blocking arms 343 on both sides of the avoidance hole 342 corresponding to the arc blocking arms 343. A space for avoiding the moving contact assembly 400 is formed between the two arc blocking arms 343. An arc-blocking surface 344 is formed on one side of the arc arm 343 facing the moving contact assembly 400, an airway side wall 101d for constituting a conversion channel 101b of the airway 101 is formed on the side where the two arc-blocking arms 343 are away from each other, and an airway top wall 101e for constituting an air inlet channel 101a of the airway 101 is formed on the top side of the two arc-blocking arms 343. The arc-blocking arm 343 can prevent the contact plate 320 from being burned by the arc, thereby playing a role in protecting the static contact assembly 300, and also constitutes a part of the airway 101.

[0047] like Figure 2 , 8An embodiment of a unit shell 500 is shown, wherein the unit shell 500 includes two relatively arranged half shells 501, and the two half shells 501 are connected and combined into the unit shell 500, and a protrusion 510 formed by folding outward is provided on the side wall of the unit shell 500, and an airway groove 511 is provided on the inner side of the protrusion 510, and the arc-blocking mechanism 340 extends into the airway groove 511 to form an airway 101 with the inner wall of the airway groove 511, and an air outlet notch 512 connected to the airway groove 511 is provided on the outer side of the protrusion 510. By arranging the airway groove 511 on the inner wall of the unit shell 500, and then combining the arc-blocking mechanism 340 in the unit shell 500 with the airway groove 511 to form the airway 101, the manufacturing cost and assembly difficulty of the parts can be reduced. Of course, the arc blocking mechanism 340 may not be set in the airway groove 511, and the airway 101 can be directly formed integrally on the inner side of the protrusion 510. In this way, the air tightness and smoothness of the airway 101 can be improved. In addition, the protrusion 510 may not be set on the unit shell 500, and an integrated airway 101 can be directly processed on the arc blocking mechanism 340, which all fall within the protection scope of the present invention.

[0048] Specifically, the inner sides of the two half shells 501 are respectively provided with airway grooves 511, the openings of the two airway grooves 511 are arranged facing each other on both sides of the static contact assembly 300, the arc blocking arms 343 of the arc blocking mechanism 340 are arranged at the openings of the airway grooves 511, and the outer sides of the two arc blocking arms 343 are spaced apart from the inner walls of the airway grooves 511 to form a conversion channel 101b;

[0049] The bottom side of the opening of the airway groove 511 is provided with a fixed step 513 and a fixed arm 514 that cooperate with the arc blocking arm 343. The fixed arm 514 is arranged on one side of the fixed step 513 close to the arc extinguishing mechanism 350 ( Figure 2 ), the fixed step 513 is arranged opposite to the air outlet cutout 512 and forms an air outlet channel 101c with the bottom side of the airway groove 511;

[0050] The arc blocking arm 343 is provided with a fixing groove 514b ( Fig.11 ), the arc-blocking arm 343 is arranged above the fixed step 513 and the fixed arm 514, and the top side of the arc-blocking arm 343 and the inner wall of the reflecting plate 354 and the airway groove 511 form an air inlet channel 101a.

[0051] like Figure 6 An embodiment of a push member 110 is shown, and the push member 110 includes a plurality of sliding plates 111 that slide with the inner wall of the airway 101 and a push plate 112 connected to the inner side of the sliding plate 111. The shape of the push plate 112 matches the radial cross-sectional shape of the airway 101, which not only has good air tightness, but also is more sensitive to changes in air pressure and has a faster breaking speed.

[0052] like Figure 5-6As shown in 12-14, the operating mechanism 200 of the circuit breaker of the present invention includes a bracket and a tripping member 210, a locking member 220, a re-fastening member 230 and a rocker arm 241 pivotally mounted on the bracket. The rocker arm 241 is provided with a main spring 242 and a handle 250. The rocker arm 241 and the main spring 242 constitute an energy storage mechanism 240. The tripping member 210 is arranged below the handle 250.

[0053] The jumper 210 and the main spring 242 are connected to the connecting rod, the connecting rod is connected to the moving contact assembly 400, and when the fastener 230 is unlocked with the lock member 220, the lock member 220 and the jumper 210 are unlocked. A reaction spring 280 connected to the jumper 210 is provided on the bracket. The direction of the force of the reaction spring 280 is the same as the unlocking direction of the jumper 210. The connecting rod includes an upper connecting rod 260 hinged to the jumper 210, and the upper connecting rod 260 and the lower connecting rod 270 are hinged through a connecting rod pivot 2670. One end of the main spring 242 is connected to the rocker arm 241, and the other end is connected to the connecting rod pivot 2670.

[0054] When the locking member 220 overlaps and locks with the jumper 210 and the re-locking member 230, the jumper 210, the locking member 220, the upper connecting rod 260, the lower connecting rod 270 and the moving contact assembly 400 form a four-link assembly, and the operating mechanism 200 can drive the moving contact assembly 400 to move through the handle 250 to realize opening and closing;

[0055] The re-fastening member 230 can unlock the locking member 220 and the jumping member 210. When the jumping member 210 and the locking member 220 are unlocked, the operating mechanism 200 is in a free tripping state, and the jumping member 210, the locking member 220, the upper connecting rod 260, the lower connecting rod 270 and the moving contact assembly 400 are transformed from a four-link assembly to a five-link assembly. Before the operating mechanism 200 completes the re-fastening, the handle 250 cannot drive the moving contact assembly 400 to move.

[0056] Specifically, the bracket includes two cheek plates 201 that are arranged opposite to each other, and a V-shaped positioning groove 202 is provided in the middle of the top side of the cheek plate 201. The rocker arm 241 includes two side plates 243 that are arranged opposite to each other. The side plates 243 are arranged in the positioning groove 202, and the bottom ends are swingably mounted on the cheek plates 201 through the positioning members 203. The top ends of the two side plates 243 are connected through a top plate 244, and the top end of the top plate 244 is fixedly connected to the handle 250. A main pull rod 246 hinged to the main spring 242 is provided on one side. A rocker shaft 245 that cooperates with the jumper 210 is provided on the inner sides of the two side plates 243 corresponding to the lower side of the handle 250 and away from the main pull rod 246. The two ends of the rocker shaft 245 are fixedly connected to the two side plates 243 respectively.

[0057] The cheek plate 201 is provided with a tripping shaft 210b and a locking shaft 220b on the left and right sides of the positioning groove 202, respectively. The tripping shaft 210b is arranged on the side close to the exhaust port of the unit housing 500 and above the arc extinguishing mechanism 350. The locking member 220 is arranged on the inner side of the two cheek plates 201 and is pivotally mounted on the locking shaft 220b. The left end of the tripping member 210 is arranged on the inner side of the two cheek plates 201 and is pivotally mounted on the tripping shaft 210b. The middle part is arranged between the two side plates 243 and is hinged to the upper connecting rod 260. The right end is swingably arranged below the rocker shaft 245 of the rocker arm 241.

[0058] A reaction spring 280 is provided on the lock shaft 220b, one end of the reaction spring 280 is connected to the jumper 210, and the other end is connected to the unit shell 500 or the cheek plate 201. The reaction spring 280 can drive the right end of the jumper 210 to swing toward the rocker arm 241 and make the right end of the jumper 210 abut against the rocker arm shaft 245. Of course, the rocker arm shaft 245 can also be omitted. The jumper 210 can also directly abut against one side of the top plate 244 or the side plate 243 of the rocker arm 241. When the reaction spring 280 is connected to the unit shell 500, it can directly abut against the outer wall of the top side of the unit shell 500. At the same time, an airway 101 is provided on the inner wall of the unit shell 500, which has the characteristics of compact structure and easy processing.

[0059] The bottom end of the lock member 220 is pivotally mounted on the lock shaft 220b, the middle part overlaps with the jumper 210, and the top end overlaps with the re-fastener 230. The middle part of the lock member 220 can swing to between the right end of the jumper 210 and the rocker shaft 245, overlapping and locking with the jumper 210 while blocking the jumper 210 from contacting the top plate 244, that is, the direction of the force of the reaction spring 280 is the same as the rotation direction of the jumper 210 when it is unlocked;

[0060] The cheek plate 201 is provided with a pivot hole corresponding to the upper side of the locking shaft 220b. The re-fastening member 230 is pivotally mounted on the inner side of the two cheek plates 201 through the pivot hole. One end of the re-fastening member 230 overlaps with the top end of the locking member 220, and the other end extends out of the cheek plate 201 to cooperate with the tripping rod 120 of the tripping mechanism 100. The tripping rod 120 can unlock the re-fastening member 230 and the locking member 220 by striking the re-fastening member 230, and at the same time, the locking member 220 and the jumper member 210 are unlocked.

[0061] The circuit breaker of the present invention, by setting the reaction spring 280 with the same unlocking direction as the tripping catch 210, not only has the characteristics of simple structure and convenient buckle, but also can be quickly unlocked with the tripping catch 210, thereby improving the tripping speed of the operating mechanism. In particular, the prior art usually adds a reset spring to the tripping catch, and the direction of the action force of the reset spring is opposite to the unlocking direction of the tripping catch 210, so as to cause the tripping catch 210 to overlap and lock with the lock catch 220. The present invention breaks through the limitation of such technical prejudice, and sets the reaction spring 280 for improving the tripping speed of the operating mechanism 200 on the tripping catch 210, accelerates the unlocking process, and increases the re-buckle force to balance the opening and closing force, thereby improving the operating feel of the handle 250 of the circuit breaker, killing two birds with one stone, and the design is ingenious. Of course, the reaction spring 280 may not be set on the lock shaft 220b, but may be set at other positions, such as being set at the left end of the tripping catch 210 close to the air outlet of the unit housing 500, or being set at the middle of the tripping catch 210, which all belong to the protection scope of the present invention. In addition, the reaction spring 280 is used to make the tripping member 210 press against one side of the rocker arm 241 to provide resistance, so that the handle 250 can be reliably maintained in the free tripping state, and the re-locking force is increased to balance the closing and opening forces, thereby improving the operating feel of heavy closing force and light opening force. At the same time, the tripping member 210 is locked by the locking member 220 that can be swung between the tripping member 210 and the rocker arm 241, so that the structure is more compact and the cooperation is more reliable.

[0062] like Fig.16 As shown, the rotation fulcrum of the jumper 210 is point D, the lock member 220 is located at point H, the main spring 242 is suspended at point G, the connection between the upper connecting rod 260 and the jumper 210 is point C, the connection between the upper connecting rod 260 and the lower connecting rod 270, that is, the position of the connecting rod pivot 2670 is point B, the connection between the lower connecting rod 270 and the moving contact assembly 400 is point A, point G is located above point C, point C is located above point B, and point B is located above point A;

[0063] In the closed state, the suspension point where the top of the main spring 242 is connected to the rocker arm 241 is located at G2, the position of the connecting rod pivot 2670 connected to the bottom of the main spring 242 is B", and the position where the lower connecting rod 270 is connected to the moving contact assembly 400 is A".

[0064] In the open state, the suspension point where the top end of the main spring 242 is connected to the rocker arm 241 is located at G1, the position of the connecting rod pivot 2670 connected to the bottom end of the main spring 242 is B, B is located above the right side of B", and the position where the lower connecting rod 270 is connected to the moving contact assembly 400 is A;

[0065] In the free tripping state, the suspension point where the top end of the main spring 242 is connected to the rocker arm 241 is located at G2', G2' is located above between G1 and G2, the position of the connecting rod pivot 2670 connected to the bottom end of the main spring 242 is B', and the position where the lower connecting rod 270 is connected to the moving contact assembly 400 is A;

[0066] The B' is located above and slightly closer to the side of B between B and B", and the three points B', B and B" form an obtuse triangle, and ∠BB'B" is set at an obtuse angle to ensure that the stretching amount of the main spring 242 of the energy storage mechanism 240 is basically the same in the open and closed states, further ensuring the consistency of the opening force and the closing force, and improving the operating feel.

[0067] like Figure 12-14 An embodiment of the reaction spring 280 is shown, wherein the reaction spring 280 includes torsion springs 281 arranged on both sides of the jumper 210, the two torsion springs 281 are hollow cylindrical, one end of each torsion spring 281 is provided with a reaction rod 282, and the other end is provided with a fixing rod 283 that cooperates with the unit housing 500, the two reaction rods 282 are connected by a connecting rod 284, and a reaction groove 284b that cooperates with the connecting rod 284 is provided on the jumper 210, and the jumper 210 extends to the reaction rod 282 and the connecting rod 284. The reaction spring 280 cooperates with the space surrounded by the rod 284, and the connecting rod 284 abuts against the side of the tripping catch 210 away from the locking catch 220, and applies a force in the unlocking direction to the lower end surface of the tripping catch 210, that is, the direction of the force of the reaction spring 280 is the same as the rotation direction of the tripping catch 210 when the circuit breaker trips. The reaction spring 280 of this embodiment can not only accelerate the unlocking of the tripping catch 210 and the locking catch 220, but also provide positioning and guiding functions for the tripping catch 210, killing two birds with one stone, and the design is ingenious. Of course, the reaction spring 280 can also be other elastic parts, such as a single torsion spring, a tension spring, or multiple reaction springs 280 can be set, all of which belong to the protection scope of the present invention, and the structure and number of the reaction spring 280 are not specifically limited here.

[0068] Furthermore, a lock reset spring 224 cooperating with the lock piece 220 is provided on the lock shaft 220b, and the torsion spring 281 of the reaction spring 280 is sleeved on the lock shaft 220b. Without increasing the volume of the circuit breaker, the unlocking movement of the accelerated jump fastener 210 is realized in a limited space, and the structure is compact and the operation is reliable.

[0069] Specifically, the locking member 220 includes two locking arms 221 arranged opposite to each other and a locking plate 222 connected between the two locking arms 221. One end of the two locking arms 221 is sleeved on the locking shaft 220b, and the other end is overlapped with the re-fastening member 230. The bottom side of the locking plate 222 is provided with a locking groove 223 overlapped with the jump fastener 210. The reaction rod 282 and the connecting rod 284 of the reaction spring 280 pass through the locking groove 223 and extend to the bottom of the jump fastener 210 to cooperate with the jump fastener 210. The structure is more compact, the cooperation is more coordinated, and the assembly is also more convenient.

[0070] like Fig.12 As shown, a fixed shaft 205 is provided between the inner sides of the two cheek plates 201, and the fixed shaft 205 and the locking shaft 220b are respectively arranged on both sides of the positioning groove 202 and riveted to the two cheek plates 201, and an annular fixed boss 205c and a locking boss 220c are respectively provided at both ends of the fixed shaft 205 and the locking shaft 220b, and a fixed shaft hole 205d and a locking shaft hole 220d respectively matched with the fixed boss 205c and the locking boss 220c are provided on the bracket. The shaft 205 and the locking shaft 220b pass through the fixed shaft hole 205d and the locking shaft hole 220d respectively, so that the end faces of the fixed boss 205c and the locking boss 220c are respectively against the inner side of the bracket and stuck on the edges of the fixed shaft hole 205d and the locking shaft hole 220d, the fixed shaft hole 205d and the axis of the fixed shaft 205 are coaxial, and the locking shaft hole 220d and the locking shaft 220b are coaxial, ensuring that the brackets on both sides are parallel to each other and can maintain a certain distance in the axial direction, so that the corresponding hole centers are coaxial. Of course, one or more shafts for riveting can be set between the two brackets, which all belong to the protection scope of the present invention.

[0071] Furthermore, the bracket is provided with an assembly hole 204 on one side of the locking shaft hole 220d, and an assembly shaft (not shown in the figure) is provided in the assembly hole 204. During assembly, the assembly shaft can be pressed against the pin of the reaction spring 280 to support the fixing rod 283 of the reaction spring 280, thereby preventing the reaction spring 280 from interfering with other mechanisms during assembly, reducing the difficulty of assembly, and improving the assembly efficiency. After assembly, the assembly shaft will be removed without interfering with the operation of other mechanisms.

[0072] Furthermore, the top of the locking arm 221 is provided with locking claws 225 that are far away from each other, and the locking claws 225 extend to one side of the bracket. The bracket is provided with a limiting surface 225b that cooperates with the locking claws 225. The limiting surface 226b can limit the rotation angle of the locking member 220 to improve reliability.

[0073] like Figure 4An embodiment of a jump fastener 210 is shown, wherein the jump fastener 210 includes a connecting portion 211 and a lap portion 212 and a pivot portion 213 arranged on both sides of the connecting portion 211, the pivot portion 213 is pivotally mounted on the bracket, the connecting portion 211 is hinged to the upper connecting rod 260 through the upper connecting rod shaft 260b, a lap boss 214 extending into the locking groove 223 of the locking member 220 is provided on the lap portion 212, a jump fastener groove 215 overlapping and cooperating with the locking groove 223 is formed on the top side of the lap boss 214, a reaction groove 284b cooperating with the connecting rod 284 of the reaction spring 280 is formed on the bottom side of the lap boss 214, and an upper connecting rod shaft hole cooperating with the upper connecting rod shaft 260b is provided on the connecting portion 211. Of course, the pivot part 213 can be riveted on the jumper shaft 210b to form a pivot connection with the bracket, or a raised platform can be integrally formed on the pivot part 213 to form a pivot connection with the bracket, both of which fall within the protection scope of the present invention. The two ends of the jumper shaft 210b can also have an annular boss structure that is the same as the fixed boss 205c and the locking boss 220c. By cooperating with the jumper shaft 210b, the fixed shaft 205 and the locking shaft 220b to form a bracket, the stability of the bracket can be further improved.

[0074] Further, the upper connecting rod 260 is two and is relatively arranged on both sides of the jumper 210, the main spring 242 is two and is respectively arranged on the outside of the two upper connecting rods 260 and connected to the middle of the connecting rod pivot 2670, the upper connecting rod 260 and the lower connecting rod 270 are respectively arranged at both ends of the connecting rod pivot 2670, and the upper connecting rod 260 is triangular, and each upper connecting rod 260 includes a first vertex 260A fixedly connected by an upper connecting rod pin 261, and a second vertex 260B fixedly connected by an upper connecting rod shaft 260b, and a second vertex 260B fixedly connected by a connecting rod pivot The shaft 2670 is respectively connected to the third vertex 260C of the corresponding lower connecting rod 270, the upper connecting rod shaft 260b on the second vertex 260B is hinged to the jumper 210, the first vertex 260A is arranged on the side of the pivot portion 213 close to the jumper 210, and the third vertex 260C is arranged on the side of the overlapping portion 212 close to the jumper 210, and the main spring 242 provides energy for the opening and closing actions of the operating mechanism, and the upper connecting rod 260 drives the lower connecting rod 270 to move the moving contact 410 of the moving contact assembly 400 to realize the opening and closing actions.

[0075] like Fig.12 An embodiment of a re-fastening member 230 is shown, wherein the re-fastening member 230 is arranged on a side of the locking member 220 away from the jumping member 210, and includes two oppositely arranged re-fastening arms 231, the re-fastening arms 231 are L-shaped, and the middle parts of the re-fastening arms 231 are fixedly connected by a re-fastening plate 232, one end of the re-fastening arm 231 is provided with a re-fastening claw 233 which overlaps with the locking arm 221 of the locking member 220, and the other end is provided with a release arm 235 which extends to the outside of the cheek plate 201 and cooperates with the release rod 120 of the release mechanism 100.

[0076] Furthermore, the re-clamping catch 233 is L-shaped and is provided with an avoidance groove 234 for avoiding the limit surface 225b. The release arms 235 on the two re-clamping arms 231 are of different lengths, and can be coordinated with the accessory shunt release and undervoltage release of the molded case circuit breaker to achieve reliable coordination.

[0077] like Figure 7 , 11 An embodiment of a stationary contact assembly 300 is shown, wherein the stationary contact assembly 300 includes a contact plate 320 and a stationary contact 310 and an arc-striking piece 330 disposed on the contact plate 320. The contact plate 320 and the arc-striking piece 330 are disposed at one end of the contact plate 320, and the other end is connected to an electrical circuit. The structure of the stationary contact assembly 300 is not specifically limited here.

[0078] like Figure 4 An embodiment of a moving contact assembly 400 is shown, and the moving contact assembly 400 includes a contact support 420 pivotally installed in a unit housing 500, and the contact support 420 is hinged to the lower connecting rod shaft 270b of the operating mechanism 200 through the lower connecting rod shaft 270b, and a contact rocker arm 430 is provided on the contact support 420, and one end of the contact rocker arm 430 is connected to the contact support 420 through a contact spring 440, and the other end is provided with a moving contact 410 that cooperates with the static contact 310 of the static contact assembly 300. Multi-phase linkage can be achieved by connecting the contact support 420 through a linkage shaft, and the structure of the moving contact assembly 400 is not specifically limited here. In addition, this embodiment shows a single-breakpoint circuit breaker, that is, a group of moving contact assemblies 400 only cooperate with a group of static contact assemblies 300 in a one-to-one correspondence, but the present invention is also applicable to double-breakpoint circuit breakers, that is, a group of moving contact assemblies cooperate with two groups of static contact assemblies 300 at the same time, both of which fall within the protection scope of the present invention.

[0079] The circuit breaker operating mechanism in this embodiment mainly includes a bracket, a rocker arm 241, a handle 250, a jumper 210, a lock 220, a re-fastener 230, an upper connecting rod 260, a lower connecting rod 270, a main spring 242, a reaction spring 280 and a plurality of shafts and a reset torsion spring. The bracket of the operating mechanism is divided into two left and right side plates, which are riveted together by at least two riveted shafts, or the two side brackets are an integral structure with a connecting part in the middle, which are riveted together by riveted shafts to ensure that the two side plate brackets are parallel and can maintain a certain distance in the axial direction, and the corresponding hole centers are coaxial. When the side plates are flat plates, the fixed shaft 205 and the lock shaft 220b have the same size. The jumper 210 is fixed between the two side brackets by a shaft or a raised column, and the fixed jumper can rotate flexibly; the upper connecting rod 260 is riveted and fixed on the jumper 210. And there is at least one rotation center point, and the upper connecting rod 260 can rotate around the rotation center point; the lower connecting rod 270 and the upper connecting rod 260 are connected to form a hinge structure through a connecting rod pivot 2670, one end of the main spring 242 is suspended on the connecting rod pivot 2670, and the other end is suspended and fixed on the rocker arm 241 or the handle 250, forming the energy storage mechanism 240 of the operating mechanism, and the other end of the lower connecting rod 270 is connected to the moving contact assembly 400 of the contact system of the circuit breaker, and the moving contact is driven by the rotation movement of the lower connecting rod 270 to realize the opening and closing action. The locking member 220 and the re-locking member 230 are fixed between the two brackets through the locking shaft 220b and the re-locking shaft 230b respectively, and can rotate flexibly, and at least one locking reset spring 224 can reset the locking member and the re-locking member.

[0080] When the operating mechanism is in the free tripping state, that is, the jumper 210 does not form an overlap with the lock member 220, the jumper 210, the upper connecting rod 260, the lower connecting rod 270 and the moving contact assembly 400 form a five-bar mechanism. When the operating mechanism completes the re-locking action, the jumper 210 and the lock member 220, the lock member 220 and the re-lock member 230 complete the overlap, and the five-bar mechanism is converted into a four-bar mechanism. The operating mechanism 200 can realize the opening and closing actions under the action of the main spring 242 of the energy storage mechanism 240, that is, the operating mechanism 200 has three states of free tripping, opening and closing during the entire operation process. If the center point of the connecting rod pivot 2670 between the upper connecting rod 260 and the lower connecting rod 270 is defined as point B', B, and B" in the three states of free tripping, opening and closing, respectively, then the triangle BB'B" formed by the three points is an obtuse triangle, that is, ∠BB'B" is an obtuse angle.

[0081] The reaction spring 280 is compressed and stores energy as the jumper 210 rotates during the re-locking process of the operating mechanism 200. When the re-locking member 230 and the lock member 220 are unlocked, the energy stored in the reaction spring 280 will accelerate the unlocking process of the jumper 210 and the lock member 220, thereby increasing the tripping speed of the operating mechanism 200. At the same time, due to the release of energy by the reaction spring 280, the jumper 210 is subjected to a reaction force in the same direction of the tripping rotation of the jumper 210, driving the rocker 241, i.e., the handle 250, to be reliably maintained in the middle position, i.e., the free tripping position. In addition, the reaction spring 280 can also appropriately increase the re-locking force, balance the closing and opening forces, improve the operating feel, and avoid the operating feel of heavy closing force and light opening force. The bracket of the operating mechanism 200 is designed with an assembly hole 204 for passing the shaft. When installing the reaction spring 280, the assembly shaft passing through the assembly hole 204 is used to support the pin of the reaction spring 280, thereby overcoming the resistance of the reaction spring 280 during the assembly process, reducing labor intensity and facilitating assembly.

[0082] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising an operating mechanism (200), the operating mechanism (200) comprising a bracket and a tripping member (210), a locking member (220), a re-locking member (230) and a rocker arm (241) pivotally mounted on the bracket, the rocker arm (241) being provided with a main spring (242) and a handle (250), the tripping member (210) and the re-locking member (230) respectively overlapping and cooperating with the locking member (220), the locking member (220) being pivotally mounted on a locking shaft (220b), and the locking member (220) comprising a locking plate (222) The bottom side of the lock plate (222) is provided with a lock groove (223) which overlaps with the jumper (210), the jumper (210) and the main spring (242) are connected to the connecting rod, the connecting rod is connected to the moving contact assembly (400), the re-fastener (230) is used to cooperate with the tripping mechanism (100) that triggers the tripping of the operating mechanism (200) when a fault occurs, and when the re-fastener (230) and the lock member (220) are unlocked, the lock member (220) and the jumper (210) are triggered to unlock, so that the operating mechanism (200) is in a free tripping state, characterized in that: A reaction spring (280) connected to a tripping catch (210) is provided on the bracket. The direction of the reaction spring (280) is the same as the unlocking direction of the tripping catch (210). The reaction spring (280) is used to accelerate the unlocking process of the tripping catch (210) and the locking catch (220) when the locking catch (230) and the locking catch (220) are unlocked. The reaction spring (280) comprises torsion springs (281) arranged on both sides of the tripping catch (210). The torsion springs (281) are sleeved on the locking catch shaft (220b). One ends of the two torsion springs (281) are connected by a connecting rod (284). The direction of the reaction spring (280) is the same as the rotation direction of the tripping catch (210) when the circuit breaker trips. The tripping catch (210) comprises a connecting portion (211) and overlapping portions arranged on both sides of the connecting portion (211). The invention relates to a torsion spring (281) having a plurality of torsion springs (210) and a plurality of pivoting portions (212). The pivoting portion (213) is pivotally mounted on the bracket. The connecting portion (211) is hinged to the upper connecting rod (260) of the connecting rod through the upper connecting rod shaft (260b). The overlapping portion (212) is provided with an overlapping boss (214) extending into the locking groove (223). A jump lock groove (215) overlapping and cooperating with the locking groove (223) is formed on the top side of the overlapping boss (214). A reaction force groove (284b) cooperating with the connecting rod (284) is formed on the bottom side of the overlapping boss (214). A reaction force rod (282) is provided at one end of each torsion spring (281). The two reaction force rods (282) are connected by a connecting rod (284). The reaction force rod (282) and the connecting rod (284) pass through the locking groove (223) and extend to the bottom of the jump lock member (210).

2. The circuit breaker according to claim 1, characterized in that: The connecting rod comprises an upper connecting rod (260) hinged to a tripping member (210), and a lower connecting rod (270) connected to a moving contact assembly (400); the upper connecting rod (260) and the lower connecting rod (270) are hinged to each other via a connecting rod pivot (2670); one end of a main spring (242) is connected to a rocker arm (241), and the other end is connected to the connecting rod pivot (2670); the center point of the connecting rod pivot (2670) is located at point B' in free tripping, at point B in opening, and at point B" in closing; B' is located above between B and B", and ∠BB'B" is set at an obtuse angle.

3. The circuit breaker according to claim 1, characterized in that: The rocker arm (241) includes two side plates (243) arranged opposite to each other, and a top plate (244) connected to the top ends of the two side plates (243); the top end of the top plate (244) is fixedly connected to the handle (250); one side is provided with a main pull rod (246) hinged to the main spring (242); the two side plates (243) are provided with a rocker arm shaft (245) cooperating with the jump catch (210) on the side away from the main pull rod (246); a reaction spring (280) makes the jump catch (210) press against the rocker arm shaft (245); and the two ends of the rocker arm shaft (245) are respectively fixedly connected to the inner sides of the two side plates (243).

4. The circuit breaker according to claim 1, characterized in that: A lock return spring (224) connected to the lock member (220) is provided on the lock shaft (220b).

5. The circuit breaker according to claim 1, characterized in that: The locking member (220) comprises two locking arms (221) arranged opposite to each other, a locking plate (222) connected between the two locking arms (221), one end of the two locking arms (221) is sleeved on the locking shaft (220b), and the other end is overlapped with the re-fastening member (230).

6. The circuit breaker according to claim 1, characterized in that: The bracket is provided with an assembly hole (204), and the assembly hole (204) is provided with an assembly shaft that abuts against the reaction force spring (280) during assembly.

7. The circuit breaker according to any one of claims 1 to 6, characterized in that: The bracket comprises two cheek plates (201) arranged opposite to each other, wherein a positioning groove (202) cooperating with a rocker arm (241) is provided in the middle of the cheek plates (201); a jumper shaft (210b) and a lock shaft (220b) are respectively provided on both sides of the positioning groove (202) of the cheek plates (201); a lock member (220) is arranged on the inner sides of the two cheek plates (201) and the bottom end of the lock member (220) is pivotally mounted on the lock shaft (220b), the middle part is overlapped with the jumper shaft (210), and the top end is overlapped with the re-lock member (230); the left end of the jumper shaft (210) is arranged on the inner sides of the two cheek plates (201) and pivotally mounted. The locking member (230) is mounted on the tripping buckle shaft (210b), the middle part is arranged between the two side plates (243) and is hinged to the upper connecting rod (260), and the right end is swingably arranged below the rocker shaft (245) of the rocker arm (241), and the middle part of the locking member (220) can swing to between the right end of the tripping buckle (210) and the rocker shaft (245) to overlap and lock with the tripping buckle (210); the locking member (230) is arranged on the inner side of the two cheek plates (201) and is pivotally mounted above the locking buckle shaft (220b), one end of which overlaps and cooperates with the top end of the locking member (220), and the other end extends out of the cheek plate (201) to cooperate with the tripping mechanism (100).

8. The circuit breaker according to claim 7, characterized in that: The connecting portion (211) is provided with an upper connecting rod shaft hole that matches the upper connecting rod shaft (260b); the upper connecting rods (260) are two and are arranged on both sides of the jumper (210) opposite to each other; the main springs (242) are two and are respectively arranged on the outer sides of the two upper connecting rods (260) and connected to the middle part of the connecting rod pivot (2670); the upper connecting rod (260) and the lower connecting rod (270) are respectively arranged at the two ends of the connecting rod pivot (2670); the upper connecting rod (260) is triangular, and each upper connecting rod (260) includes a first vertex (260A) fixedly connected by an upper connecting rod pin (261), a second vertex (260B) fixedly connected by an upper connecting rod shaft (260b), and a third vertex (260C) respectively connected to the corresponding lower connecting rod (270) by the connecting rod pivot (2670); the second vertex (260C) is connected to the corresponding lower connecting rod (270) by the connecting rod pivot (2670); and the second vertex (260A) is connected to the upper connecting rod pin (261) and the second vertex (260B) is connected to the upper connecting rod shaft (260b). The upper connecting rod shaft (260b) on (260B) is hinged to the jumper (210), the first vertex (260A) is arranged on the side of the pivot portion (213) close to the jumper (210), and the third vertex (260C) is arranged on the side of the overlap portion (212) close to the jumper (210); the re-fastening member (230) is arranged on the side of the locking member (220) away from the jumper (210), and comprises two oppositely arranged re-fastening arms (231), the re-fastening arms (231) are L-shaped, and the middle part of the re-fastening arms (231) is fixedly connected by a re-fastening plate (232), one end of the re-fastening arm (231) is provided with a re-fastening claw (233) which overlaps and cooperates with the locking arm (221) of the locking member (220), and the other end is provided with a release arm (235) which extends to the outside of the cheek plate (201) and cooperates with the release mechanism (100).

9. The circuit breaker according to any one of claims 1 to 6, characterized in that: The invention also comprises a unit housing (500) and a tripping mechanism (100); a stationary contact assembly (300) and a moving contact assembly (400) are arranged opposite to each other in the unit housing (500); a connecting rod is connected to the moving contact assembly (400) to drive the moving contact assembly (400) to swing and contact the stationary contact assembly (300); an arc extinguishing mechanism (350) is arranged above the stationary contact assembly (300); the tripping mechanism (100) comprises a pushing member (110) and a tripping rod (120); and an air passage (101) cooperating with the pushing member (110) is arranged in the unit housing (500).

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