Circuit breaker

Abstract

The circuit breaker comprises a shell, an operating mechanism and conductive units, each conductive unit comprises a contact system and an arc extinguishing system, a main circuit of each conductive unit is connected with a short-circuit protection mechanism, an air-blowing tripping mechanism is further arranged in the shell and comprises an air-blowing assembly, and the air-blowing assembly is matched with a moving assembly of the short-circuit protection mechanism. When a first fault current flows through the main line, the moving assembly is driven by an electromagnetic force generated by the short circuit protection mechanism, when a second fault current flows through the main line, an air blowing force generated by the arc extinguishing system drives the air blowing assembly to rotate, and the moving assembly is jointly driven by the electromagnetic force generated by the short circuit protection mechanism and the air blowing assembly. The current value of the first fault current is smaller than that of the second fault current. According to the utility model, the moving assembly triggers the tripping of the operating mechanism under the common driving of the air blowing assembly of the air-blowing tripping mechanism and electromagnetic force, so that the time for the moving assembly to trigger the tripping of the operating mechanism is shortened, and the internal part of the circuit breaker is prevented from being damaged by current.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to a circuit breaker. Background Art

[0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their application scopes. A low-voltage circuit breaker is an electrical appliance that has the function of a manual switch and can automatically perform undervoltage, overvoltage, overload, and / or short-circuit protection. It can be used to distribute electric energy, start asynchronous motors infrequently, and protect power supply lines and motors, etc. When serious overload, short circuit, undervoltage and other faults occur, it can automatically cut off the circuit.

[0003] In existing products, a short-circuit protection mechanism, also known as an electromagnetic release, is usually configured inside. When the current passing through the circuit breaker increases to a certain value, the electromagnetic release causes the circuit breaker to trip quickly, so as to achieve the function of circuit protection. However, when a large current flows through, the action time of the electromagnetic release driven only by electromagnetic force is relatively long, resulting in serious damage to the inside of the circuit breaker by the current. In addition, existing electromagnetic releases are usually clapper-type electromagnetic releases or solenoid-type electromagnetic releases. The clapper action of the clapper-type electromagnetic release occupies more space, and the overall volume of the solenoid of the solenoid-type electromagnetic release is relatively large, so that the electromagnetic release needs to occupy more space inside the circuit breaker, which is not conducive to the miniaturization design of the circuit breaker. Summary of the Invention

[0004] The purpose of the utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a circuit breaker, which includes a housing. An operating mechanism and at least one conductive unit are arranged inside the housing. Each conductive unit includes a contact system and an arc extinguishing system. The contact system is driven by the operating mechanism to connect or disconnect the main circuit of each conductive unit. A short-circuit protection mechanism is connected to the main circuit of each conductive unit. The short-circuit protection mechanism includes a moving component for triggering the operating mechanism to trip. At least one air-blowing tripping mechanism is also arranged inside the housing. The air-blowing tripping mechanism includes an air-blowing component. The air-blowing component cooperates with the moving component. When a first fault current flows through the main circuit, the moving component is driven by the electromagnetic force generated by the short-circuit protection mechanism. When a second fault current flows through the main circuit, the air-blowing force generated by the arc extinguishing system drives the air-blowing component to rotate, and the moving component is driven by the electromagnetic force generated by the short-circuit protection mechanism and the air-blowing component together. The current value of the first fault current is less than the current value of the second fault current.

[0007] Preferably, the operating mechanism, the contact system, and the air-blowing assembly are rotatably assembled in the housing in sequence along the same direction. The moving assembly is arranged side by side with the contact system and adjacent to the air-blowing assembly, and the moving assembly moves linearly in the housing near the side.

[0008] Preferably, the contact system includes a moving contact assembly and a static contact that cooperate with each other. The moving contact assembly is rotatably assembled and linked to the operating mechanism. The plane in which the air-blowing assembly is rotatably assembled is parallel to the plane in which the moving contact assembly is rotatably assembled. The plane where the moving trajectory of the moving assembly is located is perpendicular to the plane in which the air-blowing assembly is rotatably assembled.

[0009] Preferably, trigger parts and mating parts are respectively provided at both ends of the moving assembly. Driving parts and air-blowing parts are respectively provided at both ends of the air-blowing assembly. The trigger part is used to trigger the tripping of the operating mechanism. The air-blowing part is driven by gas to drive the rotation of the air-blowing assembly. When a second fault current flows through the main circuit, the driving part pushes the mating part.

[0010] Preferably, a base is provided in the housing. The air-blowing assembly and the moving assembly are respectively arranged on the inner and outer sides of the base. The base is provided with a through hole, and the driving part passes through the through hole to drive the moving assembly to move along the outer side of the base.

[0011] Preferably, the short-circuit protection mechanism further includes a conductive plate, a magnetic yoke, and a bracket. The moving assembly includes an armature and a pull rod connected to the armature. The conductive plate passes through the gap between the magnetic yoke and the armature and is connected to the main circuit of each conductive unit. The armature and / or the pull rod are in linear sliding fit with the bracket. The pull rod is provided with a trigger part for triggering the tripping of the operating mechanism, and the armature is provided with a mating part for cooperating with the air-blowing assembly.

[0012] Preferably, both the magnetic yoke and the armature are U-shaped frame structures, and the openings of the magnetic yoke and the armature are spaced opposite to form a magnetic gap. The magnetic gap generates a magnetic field for driving the armature when a first fault current or a second fault current flows through the conductive plate. A protruding mating part is provided on the outer side of the opening of the armature.

[0013] Preferably, a sliding structure that cooperates with each other is provided between the bracket and the pull rod. The sliding structure includes a sliding part and a sliding groove that are in sliding fit. The sliding part protrudes on the bracket or the pull rod, and the sliding groove is opened on the pull rod or the bracket.

[0014] Preferably, the bracket is formed by a partial area of the housing or a partial area of the base provided in the housing.

[0015] Preferably, one end of the conductive plate is folded back on the side facing away from the armature to form a static contact plate, so that a gap for accommodating the magnetic yoke is formed between the static contact plate and the middle part of the conductive plate.

[0016] Preferably, a reset member is connected to the pull rod.

[0017] Preferably, the air-blowing tripping mechanism further includes a housing. A sealing cavity is provided inside the housing. An air-blowing channel covered by an insulating partition is provided in the sealing cavity. The air-blowing channel communicates with an adjacent arc extinguishing system. When a second fault current flows through the main circuit, the gas generated by the arc extinguishing system blows the insulating partition into the sealing cavity.

[0018] The air-blowing assembly includes an air-blowing rod rotatably connected to the housing. A driving portion is provided at one end of the air-blowing rod. The driving portion is located outside the housing and cooperates with the moving assembly. An air-blowing portion is provided at the other end of the air-blowing rod. The air-blowing portion is driven by the air-blowing force in the sealing cavity.

[0019] Preferably, the air-blowing assembly further includes an elastic reset rod connected to the air-blowing rod for resetting the air-blowing rod.

[0020] Preferably, the reset rod and the air-blowing rod are integrally formed. One end of the reset rod is connected to the air-blowing rod. The other end of the reset rod extends along a direction deviating from the rod body of the air-blowing rod, so that there is a gap between the middle of the reset rod and the middle of the air-blowing rod.

[0021] Preferably, air-blowing channels are provided on both sides of the sealing cavity. The insulating partition includes a connecting wall and a pair of elastic walls. The connecting wall is fixed in the sealing cavity. One end of each elastic wall is connected to one side of the connecting wall. The pair of elastic walls respectively cover the air flow outlets of the two air-blowing channels located in the sealing cavity.

[0022] Preferably, the operating mechanism includes a trip latch, a lock latch and a reclosing latch that are respectively rotatably arranged. The trip latch and the lock latch are latched and cooperated. The lock latch and the reclosing latch are limited and cooperated. A traction rod is also rotatably assembled in the housing on one side of the operating mechanism. At least one push rod is assembled on the traction rod. The push rod is provided with a tripping trigger portion. The tripping trigger portion is driven by the moving assembly to drive the reclosing latch to rotate.

[0023] For the circuit breaker of the present utility model, an air-blowing tripping mechanism is internally configured. In the short-circuit protection mechanism, the moving assembly is only driven by electromagnetic force to trigger the tripping of the operating mechanism when a first fault current occurs. When a second fault current occurs, the moving assembly triggers the tripping of the operating mechanism under the combined drive of the air-blowing assembly and electromagnetic force of the air-blowing tripping mechanism, shortening the time for the moving assembly to trigger the tripping of the operating mechanism and avoiding damage to the inside of the circuit breaker by the current.

[0024] In addition, the moving track of the moving assembly in the short-circuit protection mechanism is a straight line. Especially when the moving assembly is located at a position close to the side in the housing, it is beneficial to reduce the space occupied by the moving assembly in the housing and help to reduce the volume of the circuit breaker.

[0025] In addition, the moving component includes an armature and a pull rod connected to the armature. Using the armature to cooperate with the air-blowing component reduces the number of parts, which is beneficial to cost reduction and assembly simplification.

[0026] In addition, the bracket of the short-circuit protection mechanism is formed by a partial area inside the housing, and the bracket can be omitted, reducing the number of parts, which is beneficial to cost reduction and assembly simplification.

[0027] In addition, the sealing cavity in the air-blowing tripping mechanism is provided with two air-blowing channels and is enclosed by the same U-shaped insulating partition, which not only ensures airtightness but also simplifies the structure. Description of the Drawings

[0028] Figure 1 is an exploded view of the operating mechanism, inner housing, short-circuit protection mechanism and air-blowing tripping mechanism in the present utility model;

[0029] Figure 2 is a sectional view of the operating mechanism, inner housing and air-blowing tripping mechanism in the present utility model;

[0030] Figure 3 is a schematic structural view of the middle cover in the present utility model;

[0031] Figure 4 is a schematic structural view of the base in the present utility model;

[0032] Figure 5 is a schematic structural view of the push rod in the present utility model;

[0033] Figure 6 is a schematic structural view of the short-circuit protection mechanism in the present utility model;

[0034] Figure 7 is a schematic structural view of the armature in the present utility model;

[0035] Figure 8 is a schematic structural view of the magnetic yoke in the present utility model;

[0036] Figure 9 is a schematic structural view of the pull rod in the present utility model;

[0037] Figure 10 is a schematic structural view of the air-blowing tripping mechanism in the present utility model;

[0038] Figure 11 is a schematic structural view of the housing in the present utility model;

[0039] Figure 12 is a schematic structural view of the air-blowing rod in the present utility model;

[0040] Reference Numerals:

[0041] 11 - Middle cover, 12 - Base, 13 - Partition part, 14 - Connecting hole, 15 - Through hole, 16 - Slide groove, 17 - Limiting part, 2 - Operating mechanism, 21 - Traction rod, 22 - Push rod, 221 - Tripping trigger part, 31 - Rotating shaft, 32 - Static contact, 4 - Short - circuit protection mechanism, 41 - Yoke, 411 - First attracting surface, 42 - Armature, 421 - Matching part, 43 - Pull rod, 431 - Trigger part, 432 - Sliding part, 44 - Conductive plate, 5 - Pneumatic tripping mechanism, 50 - Housing, 501 - Sealed cavity, 502 - Pneumatic blowing channel, 503 - Mounting table, 51 - Pneumatic blowing rod, 511 - Pneumatic blowing part, 512 - Driving part, 513 - Mounting part, 514 - Blocking part, 52 - Reset rod, 53 - Insulating partition. Detailed implementation manners

[0042] The following embodiments given in conjunction with the drawings further illustrate the detailed implementation manners of the circuit breaker of the present utility model. The circuit breaker of the present utility model is not limited to the descriptions of the following embodiments.

[0043] The circuit breaker includes a housing, an operating mechanism 2 and at least one conductive unit are arranged inside the housing. Each conductive unit includes a pair of terminal blocks and a contact system connected between the pair of terminal blocks. The contact system includes a moving contact assembly and a static contact 32 that cooperate with each other. The operating mechanism 2 is directly or indirectly connected to the moving contact assembly of each conductive unit, and drives the moving contact assembly to contact or separate from the static contact 32 to achieve closing or tripping, so as to connect or disconnect the main circuit of each conductive unit; each conductive unit is also configured with an arc extinguishing system, and the arc extinguishing system cooperates to extinguish the arc generated by the breaking of the contact system.

[0044] As Figure 1 、 5 shown, the operating mechanism 2 includes a trip, a latch and a reclosing that are respectively rotatably arranged. The trip and the latch are latched and cooperated, and the latch and the reclosing are limited and cooperated. A traction rod 21 is also arranged on one side of the operating mechanism 2. A short - circuit protection mechanism 4 is also arranged inside each conductive unit. The short - circuit protection mechanism 4 is usually an electromagnetic release. When a short - circuit fault occurs, the short - circuit protection mechanism 4 generates a magnetic field under the fault current. The electromagnetic force generated by this magnetic field can drive the moving component in the short - circuit protection mechanism 4 to move. The moving component drives the traction rod 21 to trigger the reclosing to reset. The latch rotates and releases the latching cooperation with the trip. The operating mechanism 2 trips and drives the moving contact assembly to separate from the static contact 32, so as to trip and cut off the power to achieve short - circuit protection.

[0045] The improvement of this application lies in that at least one air-blowing tripping mechanism 5 is further provided inside the housing. The air-blowing tripping mechanism 5 includes an air-blowing assembly, and the air-blowing assembly cooperates with the moving assembly. When a first fault current flows through the main circuit, the moving assembly is driven by the electromagnetic force generated by the short-circuit protection mechanism 4. When a second fault current flows through the main circuit, the air-blowing force generated by the arc extinguishing system drives the air-blowing assembly to rotate, and the moving assembly is jointly driven by the electromagnetic force generated by the short-circuit protection mechanism 4 and the air-blowing assembly. The current value of the first fault current is less than the current value of the second fault current.

[0046] Among them, the current value of the first fault current is 10 to 15 times the normal current value, and the current value of the second fault current is 20 to 30 times the normal current value, or the current value of the second fault current is more than 30 times the normal current value.

[0047] With such a structure, an air-blowing tripping mechanism 5 is internally configured. The moving assembly in the short-circuit protection mechanism 4 is only driven by the electromagnetic force to trigger the tripping of the operating mechanism 2 when the first fault current occurs. When the second fault current occurs, the moving assembly is driven by the air-blowing assembly of the air-blowing tripping mechanism 5 and the electromagnetic force to jointly trigger the tripping of the operating mechanism 2, shortening the time for the moving assembly to trigger the tripping of the operating mechanism 2 and avoiding damage to the internal parts of the circuit breaker caused by the current.

[0048] Specifically, as Figure 1 、 2 shown, the operating mechanism 2, the contact system, and the air-blowing assembly are sequentially rotationally assembled in the housing along the same direction. The moving assembly is arranged side by side with the contact system and adjacent to the air-blowing assembly. The moving assembly moves linearly inside the housing near the side, so that the moving assembly drives the operating mechanism 2 to trip. The moving assembly moves linearly and moves inside the housing near the side, so that the moving assembly requires less moving space when driving the operating mechanism 2, which is beneficial to reducing the overall volume of the circuit breaker.

[0049] Among them, trigger parts 431 and matching parts 421 are respectively provided at opposite ends of the moving assembly. Driving parts 512 and air-blowing parts 511 are respectively provided at both ends of the air-blowing assembly. The trigger part 431 is located near the operating mechanism 2 and is used to trigger the tripping of the operating mechanism 2. The matching part 421 is adjacent to the driving part 512. When a second fault current flows through the main circuit, the gas generated by the arc extinguishing system drives the air-blowing part 511 to rotate the air-blowing assembly, and the driving part 512 pushes the matching part 421 to make the moving assembly move linearly. At this time, the moving assembly moves under the joint cooperation of the electromagnetic force and the air-blowing assembly, improving its moving speed.

[0050] Combined with Figures 1-12 A specific embodiment of a circuit breaker is provided.

[0051] In this embodiment, the circuit breaker includes a housing. An operating mechanism 2 and at least one conductive unit are arranged inside the housing. The housing is provided with a handle hole, and an operating member connected to the operating mechanism 2 extends out of the housing from the handle hole for manual operation. In this embodiment, the operating mechanism 2 adopts the prior art. A push rod 22 corresponding to the conductive unit is arranged on its traction rod 21, and each push rod 22 is provided with a trip trigger portion 221 (see Figure 5 ); Each conductive unit is assembled in the direction away from the handle hole of the operating mechanism 2. Each conductive unit includes a pair of terminal blocks and a contact system connected between the pair of terminal blocks. The contact system includes a moving contact assembly and a static contact 32 that cooperate with each other. The moving contact assembly is drivingly connected to the operating mechanism 2, and the operating mechanism 2 drives the moving contact assembly to contact or separate from the static contact 32, thereby connecting or disconnecting the main circuit of each conductive unit; Each conductive unit further includes an arc extinguishing system, and the arc extinguishing system cooperates to extinguish the arc generated by the breaking of the contact system. The arc extinguishing system is usually configured with a gas generating member that can generate gas. The terminal blocks, the contact system, and the arc extinguishing system can adopt the prior art.

[0052] In this embodiment, an inner housing is arranged inside the housing, and a gap is left between the outer side wall of the inner housing and the inner side wall of the housing. Preferably, as Figure 1 shown, a partition portion 13 is arranged on the outer side wall of the inner housing. The outer side wall of the inner housing is divided into at least two juxtaposed strip-shaped spaces by the partition portion 13, and each strip-shaped space corresponds to a conductive unit; The operating mechanism 2 is rotatably assembled inside the housing between the handle hole and one end of the inner housing, and the inner housing provides an assembly position for the conductive unit. Figures 1-4 In

[0053] In this embodiment, the inner housing includes a base 12 and a middle cover 11 covering the base 12. The static contact 32 and the arc extinguishing system are arranged inside the base 12. In this embodiment, the moving contact assembly includes a rotating shaft 31 and a moving contact. The rotating shaft 31 is rotatably assembled on the middle cover 11, and the moving contact is connected to the rotating shaft 31. The operating mechanism 2 drives the rotating shaft 31 to rotate to drive the moving contact to cooperate with the static contact 32 inside the base 12, and the arc extinguishing system cooperates to extinguish the arc generated when the moving contact and the static contact 32 are separated.

[0054] As Figure 1 、3 As shown in , 4 and 6-9, the short-circuit protection mechanism 4 includes a conductive plate 44, a yoke 41 and an armature 42, wherein the yoke 41 and the armature 42 are spaced apart from each other to form a conductor cavity for the conductive plate 44 to pass through, and the conductive plate 44 is connected to the main circuit of each conductive unit, and the two ends of the yoke 41 are respectively bent along the two side edges of the conductive plate 44 and extend in the direction close to the armature 42, so that the yoke 41 and the armature 42 form a structure surrounding the outside of the conductive plate 44; at the same time, the yoke 41 and the armature 42 cooperate on one side of the conductive plate 44 to form a magnetic gap, and the armature 42 A pull rod 43 connected to the armature 42 forms a moving component for driving the operating mechanism 2 to trip. The moving component is arranged side by side with the contact system. When a fault current flows through the conductive plate 44, a magnetic field is generated in the magnetic gap between the yoke 41 and the armature 42, driving the armature 42 to approach the yoke 41 in a straight line. The armature 42 is provided with a matching portion 421, and a trigger portion 431 is provided at one end of the pull rod 43 away from the armature 42. The trigger portion 431 cooperates with a tripping trigger portion 221 on a push rod 22, thereby driving the traction rod 21 to rotate to trigger the operating mechanism 2 to trip.

[0055] Typically, the short-circuit protection mechanism 4 also includes a bracket, which is fixedly arranged in the shell, and the movable component slides with the bracket, that is, the armature 42 and / or the pull rod 43 slides with the bracket along a straight line. Preferably, a sliding structure that cooperates with each other is arranged between the bracket and the pull rod 43. The sliding structure generally includes a sliding portion 432 and a slide groove 16 that slide together, wherein the sliding portion 432 protrudes on the bracket or the pull rod 43, and the slide groove 16 is cooperated and opened on the pull rod 43 or the bracket. In this embodiment, the bracket can be omitted, and part of the inner wall of the shell or the outer wall of the base 12 can be used as the bracket, thereby reducing the use of parts and components, reducing costs, and at the same time, it is also conducive to simplifying the assembly process.

[0056] In this embodiment, the bracket in the short-circuit protection mechanism 4 is replaced by the outer wall of the base 12, the conductive plate 44 is a straight plate structure, the conductive plate 44 is arranged inside the base 12, the armature 42 is arranged outside the base 12, and the yoke 41 is arranged on the side of the conductive plate 44 facing away from the armature 42. It can also be understood that the middle part of the conductive plate 44 passes through the gap between the armature 42 and the yoke 41, and the two ends of the yoke 41 are respectively bent along the two side edges of the conductive plate 44 and extend in the direction close to the armature 42, and the two ends of the yoke 41 are respectively passed through the base 12 from the connecting hole 14 opened on the side wall of the base 12 for matching with the armature 42. At this time, the yoke 41 and the armature 42 are matched to surround the outside of the conductive plate 44; a gap as a magnetic gap is left between the two ends of the yoke 41 and the armature 42, one end of the armature 42 is provided with a matching portion 421, and the other end of the armature 42 is connected to a pull rod 43, and the pull rod 43 and the armature 42 move in a straight line outside the base 12.

[0057] Further, the moving component is usually connected with a reset member (not shown), that is, the reset member can be connected only to the armature 42, or only to the pull rod 43, or reset members are respectively connected to the armature 42 and the pull rod 43. The reset member preferably adopts a spring.

[0058] In this embodiment, the reset members configured for the moving component are divided into a first reset member and a second reset member. Both the first reset member and the second reset member are springs. One end of the first reset member is connected to the end of the armature 42 facing away from the pull rod 43, and the other end of the first reset member is connected to the interior of the housing, for driving the armature 42 to reset; the second reset member is also a spring. One end of the second reset member abuts against the pull rod 43, and the other end is connected to the interior of the housing, for driving the pull rod 43 to reset. The numbers of the first reset member and the second reset member are set according to actual needs. Of course, only the first reset member or only the second reset member can also be provided.

[0059] As Figure 1 、 6 shown, in this embodiment, one end of the conductive plate 44 is folded back on the side facing away from the armature 42 to form a static contact plate. At this time, a U-shaped structure is formed between a partial area of the static contact plate and the conductive plate 44. A gap for accommodating the yoke 41 is formed between the middle parts of the static contact plate and the conductive plate 44. Static contacts are arranged on the side of the static contact plate facing away from the conductive plate 44. That is, after the static contacts are provided on the static contact plate, a static contact head 32 of a conductive unit can be formed. Of course, one end of the conductive plate 44 can also be only used for connecting with the static contact head 32 arranged inside the conductive unit. The other end of the conductive plate 44 is correspondingly electrically connected to a wiring terminal.

[0060] The yoke 41 of this embodiment is as Figure 1 、 6 and 8 shown. The yoke 41 includes a plate-shaped yoke body. Both ends of the yoke body are bent in the same direction to form a pair of spaced-apart and opposite first attracting walls. The area connected between the two first attracting walls is the first connecting wall, making the yoke 41 a U-shaped frame structure as a whole. The ends of the two first attracting walls away from the first connecting wall are the openings of the yoke 41. The plate surface where each first attracting wall is located is perpendicular to the middle plate surface of the conductive plate 44, and the first attracting wall is higher than the plate surface of the conductive plate 44. At least one side edge of each first attracting wall serves as a first attracting surface 411. In this embodiment, the end surface of the first attracting wall protrudes from the conductive plate 44, and the end surface of the first attracting wall serves as the first attracting surface 411. That is, the first attracting surface 411 is located at the side edge of the first attracting wall away from the conductive plate 44. The first attracting surface 411 is preferably an inclined surface. The first attracting surface 411 passes through the communication hole 14 opened on the base 12 for cooperating with the armature 42. In addition, the yoke 41 can be formed by laminating multiple yoke bodies.

[0061] The armature 42 of this embodiment is as Figure 1 、6 As shown in FIGS. 6 and 7, the armature 42 includes a straight plate-shaped armature body. Both ends of the armature body are bent in the same direction to form a pair of second attracting walls that are spaced apart and opposite to each other. The area connecting between the two second attracting walls is the second connecting wall, making the armature 42 as a whole in a U-shaped frame structure. The ends of the two second attracting walls away from the second connecting wall are the openings of the armature 42. The plane where each second attracting wall and the second connecting wall are located is perpendicular to the plane where the conductive plate 44 is located. One side edge of the second attracting wall serves as the second attracting surface for cooperating with the first attracting surface 411. In this embodiment, the edge of the second attracting wall close to the conductive plate 44 serves as the second attracting surface. The second attracting surface is also an inclined surface, and the inclination degree of the first attracting surface 411 is the same as that of the second attracting surface. A magnetic gap is formed between the first attracting surface 411 and the second attracting surface. The first attracting surface 411 and the second attracting surface adopt inclined surfaces with the same inclination degree, so that the armature 42 and the magnetic yoke 41 have a longer mating surface, which is beneficial to ensuring the attracting stability of the two.

[0062] In this embodiment, the armature 42 is formed by stacking multiple armature bodies, and at least one armature body is provided with a protruding mating portion 421. Figure 1 、 7 As shown in FIGS. 8 and 9, the mating portion 421 is arranged in the middle of the second attracting wall and protrudes and extends outward along the direction facing away from the opening of the armature 42. When the short-circuit protection mechanism 4 is arranged on the base 12, each mating portion 421 extends along the direction close to the adjacent breaker pole and corresponds to the position of the through hole 15 of the base 12 for cooperating with the gas blow-off tripping mechanism 5.

[0063] Combined with Figure 1 、 6 FIGS. 14 and 15 provide a specific structure of a pull rod 43. The pull rod 43 includes a body. The body is a plate-shaped structure with unequal widths at both ends, and the width of the body gradually decreases. Figure 1 、 9 As shown in FIGS. 18 and 19, the width of the body decreases step by step. The end with a larger width of the body is fixedly connected to the armature 42. The end with a smaller width of the body is provided with a through hole serving as a tripping trigger portion 221. Two protruding sliding portions 432 are arranged in the middle of the body. Correspondingly, a sliding groove 16 for cooperating with the sliding portions 432 is opened on the outer side wall of the base 12. The sliding groove 16 is a strip-shaped groove, and the length of the sliding groove 16 is equal to the moving stroke of the armature 42. The pull rod 43 can also be provided with structures such as grooves for connecting a reset member.

[0064] In this embodiment, a limiting structure for limiting the moving track of the pull rod 43 is further arranged between the pull rod 43 and the inner shell. Paired limiting portions 17 are arranged on the outer side of the inner shell. A gap is left between each pair of limiting portions 17. The pull rod 43 moves within the gap between each pair of limiting portions 17, so that the edge of the pull rod 43 slides and cooperates with the limiting portions 17, thereby limiting the moving track of the pull rod 43 to be a straight line. AsFigure 1 , 3 As shown in FIGS. 3 and 4, two pairs of limiting portions 17 are provided on the inner shell. The distance between one pair of limiting portions 17 is smaller and is provided on the outer side wall of the cover body, and the distance between the other pair of limiting portions 17 is larger and is provided on the outer side wall of the base 12. The contact surface of each limiting portion 17 for contacting the pull rod 43 is an arc surface, and the specific shape of the limiting portion 17 is not limited.

[0065] The arc extinguishing system in each contact unit adopts the prior art. The arc extinguishing system includes an arc extinguishing chamber, and the arc extinguishing chamber includes a gas generating member that can generate a large amount of gas. The gas in the arc extinguishing chamber usually discharges from the exhaust hole opened on the outer shell. In this embodiment, the arc extinguishing system is further provided with at least one air flow inlet, which is preferably located in the arc extinguishing chamber, and the air flow inlet is a part of the air flow channel.

[0066] As Figure 1 , 2 As shown in FIGS. 9, 10 - 12, at least one air - blowing tripping mechanism 5 is further provided in the outer shell. The air - blowing tripping mechanism 5 is arranged inside the base 12 and adjacent to the arc extinguishing system. In this embodiment, the air - blowing tripping mechanism 5 is arranged between two conductive units, that is, the air - blowing tripping mechanism 5 is adjacent to two arc extinguishing systems at the same time. The air - blowing tripping mechanism 5 includes an air - blowing assembly rotatably assembled in the base 12. That is, the operating mechanism 2, the moving contact assembly, and the air - blowing assembly are sequentially rotatably assembled in the outer shell. In this embodiment, the air - blowing assembly is rotatably assembled substantially along the direction parallel to the middle cover 11. Both ends of the air - blowing assembly are respectively provided with a driving portion 512 and an air - blowing portion 511. The driving portion 512 passes through the through - hole 15 opened on the base 12, and the through - hole 15 corresponds to the mating portion 421 of the armature 42, so that the driving portion 512 is matched with the mating portion 421. When the main circuit passes through a normal current and a first fault current, the gas generated in the arc extinguishing system is not enough to drive the air - blowing portion 511. When the main circuit passes through a larger second fault current, a large amount of gas generated in the arc extinguishing system drives the air - blowing portion 511, and the air - blowing assembly is driven to rotate, so that the driving portion 512 pushes the mating portion 421, thereby enabling the moving assembly to move linearly. In this embodiment, the rotational assembly plane of the air - blowing assembly is parallel to the rotational assembly plane of the moving contact assembly, and the rotational assembly plane of the air - blowing assembly is perpendicular to the plane where the moving track of the moving assembly is located.

[0067] As Figure 1 , 2As shown in FIGS. 10 - 12, the air - blowing tripping mechanism 5 generally further includes a housing 50. A sealing cavity 501 is provided inside the housing 50. The air - blowing assembly includes an air - blowing rod 51. The air - blowing rod 51 is rotatably connected to the housing 50. One end of the air - blowing rod 51 is provided with a driving part 512, and the driving part 512 is located outside the housing 50 for cooperating with the cooperating part 421 of the moving assembly. The other end of the air - blowing rod 51 is provided with an air - blowing part 511, and the air - blowing part 511 is inside the sealing cavity 501. The sealing cavity 501 is communicated with the adjacent arc - extinguishing system through an air - blowing channel 502. That is, the air - blowing channel 502 is correspondingly communicated with the air - flow inlet of the arc - extinguishing system. The air - blowing channel 502 is covered by an insulating partition 53. The insulating partition 53 can cover the air - flow inlet, the air - flow outlet or the middle part of the air - blowing channel 502. When the main circuit passes through a normal current and a relatively small first fault current, the air - blowing force generated by the arc - extinguishing system is not sufficient to blow open the insulating cover plate. When the main circuit passes through a relatively large second fault current, a large amount of gas generated by the arc - extinguishing system blows the insulating partition 53, so that the gas enters the sealing cavity 501 to blow the air - blowing rod 51 in the air - blowing assembly.

[0068] Preferably, the air - blowing assembly further includes an elastic reset rod 52. The reset rod 52 is connected to the air - blowing rod 51 for resetting the air - blowing rod 51. The reset rod 52 can be completely located inside the sealing cavity 501, can be all located outside the housing 50, or part of it is located inside the housing 50 and part of it is located outside the housing 50.

[0069] Combined with Figure 1 、 2 FIGS. 10 - 12 provide an air - blowing tripping mechanism 5 applied to this embodiment. The housing 50 includes two oppositely arranged cover plates. The two cover plates are arranged side by side between the arc - extinguishing systems of two adjacent breaker poles. On one side of each cover plate facing the air - blowing assembly, there are a first groove and a second groove. The first grooves of the two cover bodies enclose an installation groove. In the middle of the installation groove, there is an installation table 503 for rotatably assembling the air - blowing assembly. The second grooves of the two cover plates enclose a sealing cavity 501. Among them, the volume of the sealing cavity 501 is much smaller than the volume of the installation groove. Each cover plate is provided with an air - blowing channel 502 communicated with the sealing cavity 501. There is an open communication between the installation groove and the sealing cavity 501. An insulating partition 53 is arranged in the sealing cavity 501 for covering the air - flow outlet of the air - blowing channel 502 in the sealing cavity 501. In the figure, the insulating partition 53 is a U - shaped structure. The insulating partition 53 includes a connecting wall and a pair of elastic walls. The connecting wall is fixed in the sealing cavity 501 along the direction perpendicular to the two cover plates. One end of each elastic wall is connected to one side of the connecting wall. The surface of the elastic wall fits on each cover plate and correspondingly covers the air - flow outlet of each air - blowing channel 502. The two elastic walls cover the two air - flow outlets in the same sealing cavity 501 at the same time. Such a structure can save internal space and is beneficial to ensuring the functional stability of the insulating partition 53.

[0070] The air-blowing assembly is rotatably assembled on the mounting table 503. One end of the air-blowing assembly is provided with an air-blowing part 511, and the air-blowing part 511 is located in the sealing cavity 501 and corresponds to the air flow outlet. The other end of the air-blowing assembly is provided with a driving part 512, and the driving part 512 extends from the mounting groove to the outside of the housing 50 and corresponds to the mating part 421.

[0071] As Figure 1 、 2 、10 and 12 show that the air-blowing assembly includes an air-blowing rod 51. The air-blowing rod 51 is a rod-shaped structure with a certain width as a whole. One end of the air-blowing rod 51 is provided with a driving part 512. In the figure, an arc-shaped convex edge serving as the driving part 512 extends outward from the edge of one end of the air-blowing rod 51. When the driving part 512 extends out of the through-hole 15 opened on the base 12, the mating part 421 of the armature 42 can abut against the concave surface of the arc-shaped convex edge, which is beneficial to ensuring the stable cooperation between the mating part 421 and the driving part 512. The middle part of the air-blowing rod 51 is provided with a mounting part 513 rotatably connected to the mounting table 503. The other end of the air-blowing rod 51 is provided with an air-blowing part 511. In the figure, the air-blowing part 511 is a plate-shaped structure, and the plate surface of the air-blowing part 511 is perpendicular to the plate surface of the air-blowing rod 51. The air-blowing part 511 is located in the sealing cavity 501 and close to the air flow outlet of the air-blowing channel 502. After the insulating partition 53 is opened, the gas blows towards the plate surface of the air-blowing part 511 to drive the air-blowing rod 51. Further, the air-blowing rod 51 is also provided with a blocking part 514. In the figure, the blocking part 514 is an arc-shaped convex platform, and the arc-shaped convex platform corresponds to the open end. When the sealing partition is blown, the arc-shaped convex platform can close the open end between the sealing cavity 501 and the mounting groove to prevent the gas from overflowing from the mounting groove out of the housing 50. Of course, the air-blowing rod 51 may not be provided with the blocking part 514, but the overflowing gas may affect the use safety.

[0072] As Figure 1 、 2 、10 and 12 show that the air-blowing assembly further includes a reset rod 52. Preferably, the reset rod 52 and the air-blowing rod 51 are preferably integrally formed structures, that is, one end of the air-blowing rod 51 is connected to the reset rod 52. Figure 12 In, one end of the reset rod 52 where the trigger part 431 is provided is connected to the air-blowing rod 51. The other end of the reset rod 52 extends along a direction deviating from the rod body of the air-blowing rod 51, so that there is a gap between the middle part of the reset rod 52 and the middle part of the air-blowing rod 51. The reset rod 52 has elasticity. When the air-blowing rod 51 is driven to rotate, the reset rod 52 abuts against the housing 50 to undergo elastic deformation, and the deformed reset rod 52 provides a driving force for resetting the air-blowing rod 51 when it returns to its original state.

[0073] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is usually placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0074] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A circuit breaker, comprising a housing, an operating mechanism (2) and at least one conductive unit arranged in the housing, each conductive unit comprising a contact system and an arc extinguishing system, the operating mechanism (2) driving the contact system to connect or disconnect a main line of each conductive unit, a short-circuit protection mechanism (4) being connected to the main line of each conductive unit, the short-circuit protection mechanism (4) comprising a moving component for triggering the operating mechanism (2) to trip, characterized in that: At least one air-blowing release mechanism (5) is also arranged in the housing. The air-blowing release mechanism (5) comprises an air-blowing component. The air-blowing component cooperates with the moving component. When a first fault current flows through the main line, the moving component is driven by the electromagnetic force generated by the short-circuit protection mechanism (4). When the second fault current flows through the main line, the air blowing force generated by the arc extinguishing system drives the air blowing component to rotate, and the moving component is driven by the electromagnetic force generated by the short-circuit protection mechanism (4) and the air blowing component. The current value of the first fault current is smaller than the current value of the second fault current.

2. The circuit breaker according to claim 1, characterized in that: The operating mechanism (2), the contact system and the air blowing assembly are assembled in the housing in sequence and rotated in the same direction; the moving assembly is arranged side by side with the contact system and adjacent to the air blowing assembly; and the moving assembly moves in a straight line in the housing near the side.

3. The circuit breaker according to claim 2, characterized in that: The contact system comprises a movable contact assembly and a stationary contact (32) which cooperate with each other, the movable contact assembly is rotatably assembled and linked with the operating mechanism (2), the plane of the rotary assembly of the air blowing assembly is parallel to the plane of the rotary assembly of the movable contact assembly, and the plane where the moving trajectory of the movable assembly is located is perpendicular to the plane of the rotary assembly of the air blowing assembly.

4. The circuit breaker according to claim 2, characterized in that: The two ends of the moving component are respectively provided with a triggering part (431) and a matching part (421); the two ends of the air blowing component are respectively provided with a driving part (512) and an air blowing part (511); the triggering part (431) is used to trigger the operating mechanism (2) to trip; the air blowing part (511) is driven by gas to drive the air blowing component to rotate; when a second fault current flows through the main line, the driving part (512) pushes the matching part (421).

5. The circuit breaker according to claim 4, characterized in that: A base (12) is provided in the shell, and the air blowing component and the moving component are respectively arranged on the inner and outer sides of the base (12); a through hole (15) is provided in the base (12), and the driving part (512) passes through the through hole (15) to drive the moving component to move along the outer side of the base (12).

6. The circuit breaker according to any one of claims 1 to 5, characterized in that: The short-circuit protection mechanism (4) also includes a conductive plate (44), a yoke (41) and a bracket. The movable component includes an armature (42) and a pull rod (43) connected to the armature (42). The conductive plate (44) passes through the gap between the yoke (41) and the armature (42) and is connected to the main line of each conductive unit. The armature (42) and / or the pull rod (43) are slidably matched with the bracket along a straight line. The pull rod (43) is provided with a triggering portion (431) for triggering the operating mechanism (2) to trip, and the armature (42) is provided with a matching portion (421) for matching with an air blowing component.

7. The circuit breaker according to claim 6, characterized in that: The yoke (41) and the armature (42) are both U-shaped frame structures, and the opening of the yoke (41) and the opening of the armature (42) are spaced relative to each other to form a magnetic gap, and the magnetic gap generates a magnetic field for driving the armature (42) when a first fault current or a second fault current flows through the conductive plate (44), and a protruding matching portion (421) is provided on the outer side of the opening of the armature (42).

8. The circuit breaker according to claim 6, characterized in that: A sliding structure that cooperates with each other is arranged between the bracket and the pull rod (43), and the sliding structure includes a sliding portion (432) and a sliding groove (16) that cooperate with each other. The sliding portion (432) is protrudingly arranged on the bracket or the pull rod (43), and the sliding groove (16) is opened on the pull rod (43) or the bracket.

9. The circuit breaker according to claim 8, characterized in that: The support is formed by a partial area of ​​the housing or a partial area of ​​a base (12) arranged in the housing.

10. The circuit breaker according to claim 6, characterized in that: One end of the conductive plate (44) is folded back on a side facing away from the armature (42) to form a stationary contact plate, so that a gap for accommodating the magnetic yoke (41) is formed between the stationary contact plate and the middle of the conductive plate (44).

11. The circuit breaker according to claim 6, characterized in that: The pull rod (43) is connected with a reset member.

12. The circuit breaker according to any one of claims 1 to 5, characterized in that: The gas-blowing tripping mechanism (5) further comprises a housing (50), wherein a sealed cavity (501) is provided inside the housing (50), wherein the sealed cavity (501) is provided with a gas-blowing channel (502) covered by an insulating partition (53), wherein the gas-blowing channel (502) is communicated with an adjacent arc-extinguishing system, and when a second fault current flows through the main line, gas generated by the arc-extinguishing system blows the insulating partition (53) into the sealed cavity (501), The air blowing assembly comprises an air blowing rod (51), wherein the air blowing rod (51) is rotatably connected to the shell (50), a driving part (512) is provided at one end of the air blowing rod (51), and the driving part (512) is located outside the shell (50) and cooperates with the moving assembly, and an air blowing part (511) is provided at the other end of the air blowing rod (51), and the air blowing part (511) is driven by air blowing force in the sealed cavity (501).

13. The circuit breaker according to claim 12, characterized in that: The air blowing assembly further comprises an elastic reset rod (52), wherein the reset rod (52) is connected to the air blowing rod (51) and is used for resetting the air blowing rod (51).

14. The circuit breaker according to claim 13, characterized in that: The reset rod (52) and the air blowing rod (51) are integrally formed, one end of the reset rod (52) is connected to the air blowing rod (51), and the other end of the reset rod (52) extends in a direction deviating from the rod body of the air blowing rod (51), so that a gap is left between the middle part of the reset rod (52) and the middle part of the air blowing rod (51).

15. The circuit breaker according to claim 12, characterized in that: Air blowing channels (502) are provided on both sides of the sealed cavity (501); the insulating partition (53) comprises a connecting wall and a pair of elastic walls; the connecting wall is fixed in the sealed cavity (501); one end of each elastic wall is connected to one side of the connecting wall; the pair of elastic walls respectively cover the air flow outlets of the two air blowing channels (502) located in the sealed cavity (501).

16. The circuit breaker according to any one of claims 1 to 5, characterized in that: The operating mechanism (2) comprises a jump buckle, a lock buckle and a re-lock buckle which are respectively rotatably arranged, the jump buckle is in caulking engagement with the lock buckle, and the lock buckle is in limiting engagement with the re-lock buckle. A traction rod (21) is also rotatably mounted in a housing on one side of the operating mechanism (2), the traction rod (21) being equipped with at least one push rod (22), the push rod (22) being provided with a release triggering portion (221), and the release triggering portion (221) is driven by the moving assembly to drive the re-lock buckle to rotate.

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