Arc quenching system and circuit breaker

Abstract

An arc-extinguishing system and circuit breaker are disclosed. The arc-extinguishing system includes two parallel arc-extinguishing chambers. In a first direction, the arc inlets of the two arc-extinguishing chambers are spaced apart and opposite each other. The end of each arc-extinguishing chamber furthest from the arc inlet is an exhaust end. Multiple arc-extinguishing grids arranged in a second direction are disposed within the arc-extinguishing chamber located between the arc inlet and the exhaust end. A magnet assembly is also disposed outside each arc-extinguishing chamber. The magnet assembly includes a permanent magnet and pairs of magnetic conductive plates. In the second direction, the permanent magnet and the arc-extinguishing chamber are stacked. In a third direction, the arc-extinguishing chamber and the permanent magnet are located between each pair of magnetic conductive plates. The two magnetic poles of the permanent magnet are respectively attached to each pair of magnetic conductive plates to generate an arc-initiating magnetic field, which covers both the arc inlet and the exhaust end of the arc-extinguishing chamber. In this invention, a magnet assembly is disposed outside each arc-extinguishing chamber. The magnetic conductive plates and the permanent magnet work together to generate an arc-initiating magnetic field that completely covers the arc-extinguishing chamber, facilitating the movement of the arc into the arc-extinguishing chamber and thus improving the arc-initiating and arc-extinguishing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to an arc extinguishing system and a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device used to disconnect and connect load circuits, as well as to disconnect faulty circuits to prevent the escalation of accidents and thus ensure the safe operation of load circuits. Currently, the electric arc generated by the contact system in a circuit breaker usually enters the arc-extinguishing system through the magnetic blow-out effect generated by the arc and the conductive structure itself. However, since the direct current does not have a zero-crossing point, its disconnection is quite difficult. Most of the non-polarized circuit breakers currently on the market have low voltage levels. As the voltage level increases, the difficulty of disconnecting the direct current increases dramatically. In addition, in polarized circuit breakers, adding permanent magnets on both sides of the contact system can provide an additional magnetic field to promote the movement, elongation, or entry of the direct current arc into the arc-extinguishing chamber. However, permanent magnets are too large, costly, and occupy a lot of space. If the permanent magnets are too small, it will not be conducive to the movement of the arc. Utility Model Content

[0003] The purpose of this invention is to overcome at least one defect of the prior art and to provide an arc extinguishing system and a circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides an arc-extinguishing system, comprising two parallel arc-extinguishing chambers. In a first direction, the arc inlets of the two arc-extinguishing chambers are spaced apart and opposite each other. The end of each arc-extinguishing chamber furthest from the arc inlet is an exhaust end. A plurality of arc-extinguishing grids arranged in a second direction are disposed within the arc-extinguishing chamber located between the arc inlet and the exhaust end. A magnet assembly is also disposed outside each arc-extinguishing chamber. The magnet assembly includes a permanent magnet and a pair of magnetic conductive plates. In the second direction, the permanent magnet and the arc-extinguishing chamber are stacked. In a third direction, the arc-extinguishing chamber and the permanent magnet are located between each pair of magnetic conductive plates. The two magnetic poles of the permanent magnet are respectively attached to each pair of magnetic conductive plates to generate an arc-inducing magnetic field, and the arc-inducing magnetic field covers the arc inlet and the exhaust end of the arc-extinguishing chamber. The first direction, the second direction, and the third direction are perpendicular to each other.

[0006] Preferably, the magnetic poles of the permanent magnets of the two magnet assemblies are oriented in opposite directions, so that the arc-inducing magnetic fields of the corresponding two arc-extinguishing chambers are in opposite directions; or, the magnetic poles of the permanent magnets of the two magnet assemblies are oriented in the same direction, so that the arc-inducing magnetic fields of the corresponding two arc-extinguishing chambers are in the same direction.

[0007] Preferably, the permanent magnets corresponding to the two arc-extinguishing chambers are arranged side by side and spaced apart in the first direction, or the two arc-extinguishing chambers form a rotationally symmetrical structure, so that the permanent magnets corresponding to the two arc-extinguishing chambers form a rotationally symmetrical structure.

[0008] Preferably, the magnetic plate is made of a magnetic material or a magnetically conductive material.

[0009] Preferably, each arc-extinguishing chamber further includes a pair of gas-generating elements and / or side plates, with each arc-extinguishing grid plate assembled between the pairs of gas-generating elements, or each arc-extinguishing grid plate assembled between the pairs of side plates, wherein in the third direction, the gas-generating elements and side plates are located between each pair of magnetic plates.

[0010] Preferably, it also includes an exhaust channel, one end of which is connected to an exhaust end, and the exhaust channel is provided with a plurality of blocking parts, with adjacent blocking parts being staggered relative to each other.

[0011] Preferably, a contact system is provided between the two arc-extinguishing chambers. The contact system includes a moving contact assembly and two stationary contacts. In a second direction, each stationary contact is spaced apart from a moving contact portion of the moving contact assembly at an arc inlet. In a third direction, the arc inlet is located between a pair of magnetic plates.

[0012] Preferably, each of the stationary contacts includes a stationary contact plate, one end of which extends to the arc inlet and is connected to a stationary arc-inducing plate extending into the arc-extinguishing chamber, and the middle of the stationary contact plate is bent at least once so that the other end of the stationary contact plate extends outside the arc-extinguishing chamber.

[0013] The moving contact assembly includes a moving contact bridge, with its two ends serving as moving contact portions and a stationary contact spaced apart in a second direction. The end of each moving contact portion extends away from the operating mechanism to form a moving arc-inducing portion, which extends into the arc-extinguishing chamber.

[0014] This utility model also provides a circuit breaker, including a housing, an operating mechanism and at least one circuit breaker pole disposed within the housing, the circuit breaker pole including a contact system, and each circuit breaker pole further including an arc extinguishing system as described above.

[0015] Furthermore, the outer casing is provided with terminals at both ends, and the terminals correspond to the operation holes and wiring ports provided on the outer casing. The side wall of the outer casing with wiring ports is also provided with an air outlet, and an exhaust channel is connected between the air outlet and the exhaust end of each arc-extinguishing chamber.

[0016] The arc extinguishing system and circuit breaker of this invention are equipped with a magnet assembly outside each arc extinguishing chamber. The magnetic plate and permanent magnet work together to generate an arc-initiating magnetic field that completely covers the arc extinguishing chamber, which is conducive to driving the arc to move into the arc extinguishing chamber, thereby improving the arc ignition and arc extinguishing efficiency.

[0017] Furthermore, by changing the direction of the magnetic poles of the permanent magnets corresponding to the two arc-extinguishing chambers, the polarity requirement can be met when the directions of the two arc-inducing magnetic fields are the same, and the non-polarity requirement can be met when the directions of the two arc-inducing magnetic fields are opposite. Its structure is simple, it is convenient to change the polarity requirement, and it has a wide range of applications.

[0018] In addition, the magnetic plate can be made of magnetic material or a magnet, which is convenient for meeting the requirements of circuit breakers of different specifications and has a wide range of applications.

[0019] In addition, the exhaust passage can buffer the exhaust gas discharged from the arc-extinguishing chamber, and the barrier can further buffer the exhaust gas and prevent impurities from being ejected outside the circuit breaker.

[0020] In particular, the exhaust passage is located on the side away from the operating port, which makes full use of the space inside the housing and avoids the exhaust gas from affecting the wiring terminals. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the internal structure of the circuit breaker in the first embodiment of this utility model (with the magnetic plate removed);

[0022] Figure 2 This is a schematic diagram of the internal structure of the circuit breaker in the first embodiment of this utility model;

[0023] Figure 3 This is a schematic diagram of the arc-extinguishing system in the first embodiment of this utility model;

[0024] Figure 4 This is a cross-sectional view of the arc-extinguishing system in the first embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram of the internal structure of the circuit breaker in the second embodiment of this utility model;

[0026] Figure label:

[0027] 10-Circuit breaker pole, 11-Housing, 111-Terminal, 2-Operating mechanism, 31-Moving contact assembly, 310-Contact support, 311-Moving contact bridge, 312-Shaft, 32-Stationary contact, 321-First stationary contact, 322-Second stationary contact, 41-Arc extinguishing chamber, 42-Exhaust passage, 421-Isolation part, 43-Stationary arc-starting plate, 44-Permanent magnet, 45-Magnetic guide plate, 46-Arc extinguishing grid, 48-Gas generating element, 5-Short circuit protection mechanism, 6-Overload protection mechanism, 7-Terminal, 8-Handle mechanism. Detailed Implementation

[0028] The specific implementation of the arc-extinguishing system and circuit breaker of this utility model is further described below with reference to the accompanying drawings. The arc-extinguishing system and circuit breaker of this utility model are not limited to the descriptions in the following embodiments.

[0029] The circuit breaker includes a housing 11, within which an operating mechanism 2 and at least one circuit breaker pole 10 are disposed. Each circuit breaker pole 10 includes a pair of spaced-apart terminals 7, and a contact system is connected between the pair of terminals 7. The contact system includes a moving contact assembly 31 and a stationary contact 32. The moving contact assembly 31 is driven by the operating mechanism 2 to contact or separate from the stationary contact 32. An arc extinguishing system cooperates with the contact system to extinguish the arc generated by the contact system during disconnection.

[0030] For ease of description, the direction in which the length of the circuit breaker is located is taken as the first direction, the direction in which the height of the circuit breaker is located is taken as the second direction, and the direction in which the thickness of the circuit breaker is taken as the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0031] Specifically, in each circuit breaker pole 10, a pair of terminals 7 are spaced apart at opposite ends of the housing 11 in a first direction. The contact system and the arc-extinguishing system are located between the pair of terminals 7. The contact system has a double-break structure, that is, there are two stationary contacts 32, and the two stationary contacts 32 are spaced apart in the first direction. The moving contact assembly 31 includes a moving contact bridge 311 arranged along the first direction, with each end of the moving contact bridge 311 serving as a moving contact portion. Each moving contact portion is spaced apart from a stationary contact 32 in the second direction. Correspondingly, the arc-extinguishing system includes two... In the first direction, each arc-extinguishing chamber 41 is located between the contact system and a terminal 7, with the arc inlets of two arc-extinguishing chambers 41 facing each other at intervals. The end of each arc-extinguishing chamber 41 away from the arc inlet is the exhaust end. Multiple arc-extinguishing grid plates 46 arranged in the second direction are provided in the arc-extinguishing chamber 41 located between the arc inlet and the exhaust end. Each stationary contact 32 and a moving contact part are correspondingly provided at the arc inlet of an arc-extinguishing chamber 41. The movement trajectory of the moving contact part corresponds to the arc inlet. The arc generated by the breaking of the contact system is extinguished by the arc-extinguishing chamber 41.

[0032] The improvement of this application lies in that a magnet assembly is also configured outside each arc-extinguishing chamber 41. The magnet assembly includes a permanent magnet 44 and a pair of magnetically conductive plates 45. In a second direction, the permanent magnet 44 is stacked with the arc-extinguishing chamber 41. In a third direction, the arc-extinguishing chamber 41 and the permanent magnet 44 are located between each pair of magnetically conductive plates 45. The two magnetic ends of the permanent magnet 44 are respectively attached to each pair of magnetically conductive plates 45 to generate an arc-initiating magnetic field, and the arc-initiating magnetic field covers the arc inlet and exhaust end of the arc-extinguishing chamber 41. In this way, by configuring a magnet assembly outside each arc-extinguishing chamber 41, the magnetically conductive plates 45 and the permanent magnet 44 cooperate to generate an arc-initiating magnetic field that completely covers the arc-extinguishing chamber 41, which is beneficial for driving the arc to move into the arc-extinguishing chamber 41, thereby improving the arc-initiating and arc-extinguishing efficiency.

[0033] Specifically, the permanent magnets 44 of the two magnet components have opposite magnetic poles, which can be applied to non-polar circuit breakers, thereby making the arc-inducing magnetic field directions of the corresponding two arc-extinguishing chambers 41 opposite; the permanent magnets 44 of the two magnet components have the same magnetic pole orientation, which can be applied to polarized circuit breakers, thereby making the arc-inducing magnetic field directions of the corresponding two arc-extinguishing chambers 41 the same.

[0034] Furthermore, the permanent magnets 44 corresponding to the two arc-extinguishing chambers 41 are arranged side by side and spaced apart in the first direction. When the arc-extinguishing system is installed in the circuit breaker, the moving contact assembly 31 between the two arc-extinguishing chambers 41 moves in a straight line; or, the two arc-extinguishing chambers 41 form a rotationally symmetrical structure, so that the permanent magnets 44 corresponding to the two arc-extinguishing chambers 41 form a rotationally symmetrical structure. When the arc-extinguishing system is installed in the circuit breaker, the moving contact assembly 31 between the two arc-extinguishing chambers 41 rotates. It has a wide range of applications.

[0035] In addition, each arc-extinguishing chamber 41 also includes a gas-generating component 48 and / or a side plate. The gas-generating components 48 are arranged in pairs and are spaced apart in the third direction. Each arc-extinguishing grid plate 46 is arranged between each pair of gas-generating components 48. Two adjacent arc-extinguishing grid plates 46 are spaced apart in the second direction. When the arc enters the arc-extinguishing chamber 41, the gas generated by the gas-generating component 48 can push the arc to enter quickly. The gas-generating components 48 are also arranged in pairs and are spaced apart in the third direction. Each arc-extinguishing grid plate 46 is arranged between each pair of gas-generating components 48. Two adjacent arc-extinguishing grid plates 46 are spaced apart in the second direction. Of course, the arc-extinguishing chamber 41 can be equipped with side plates and gas-generating components 48 at the same time. In this case, the gas-generating components 48 are arranged between the side plates in the third direction, and the gas-generating components 48 are at least correspondingly arranged on opposite sides of the arc inlet. Each arc-extinguishing grid plate 46 can be partially inserted into the gas-generating component 48.

[0036] Combination Figure 1-4 A first embodiment of a circuit breaker is provided.

[0037] The circuit breaker includes a housing 11, with opposite ends of the housing 11 serving as terminals 111. An operating mechanism 2 and at least one circuit breaker pole 10 are provided inside the housing 11. In this embodiment, the operating mechanism 2 and the circuit breaker pole 10 can adopt existing technologies.

[0038] like Figure 1 , 2As shown, the operating mechanism 2 includes a lever, a latch, and a lock. The lever is rotatably mounted inside the housing 11, and the latch and lock are rotatably mounted on the lever, with one end of the latch and lock engaging. The operating mechanism 2 can also be linked to a handle mechanism, which extends out of the housing 11 from a handle hole for manual operation. Each circuit breaker pole 10 includes a pair of terminals 7 spaced apart and opposite each other in a first direction. Each terminal 7 is correspondingly disposed within a terminal 111 of the housing 11, and the operating hole and wiring port of each terminal 111 are respectively connected to a terminal 7. Correspondingly, a contact system is provided between a pair of terminals 7. The contact system includes a moving contact assembly 31 and stationary contacts 32 that cooperate with each other. The moving contact assembly 31 is driven and connected to the operating mechanism 2. The operating mechanism 2 drives the moving contact assembly 31 to contact or separate from the stationary contacts 32, thereby connecting or disconnecting the main line of each circuit breaker pole 10. In this embodiment, the contact system is a double-break structure, that is, the contact system includes a moving contact assembly 31 and two stationary contacts 32. The operating mechanism 2 drives the moving contact assembly 31 to move in a straight line, so that the moving contact assembly 31 and the two stationary contacts 32 contact or separate at the same time.

[0039] Each circuit breaker pole 10 also includes an arc-extinguishing system. In the first direction, the arc-extinguishing system is disposed within a housing 11 between a pair of terminals 7, and is used to cooperate with the contact system to extinguish the arc generated by the contact system's disconnection. Specifically, as shown below... Figure 1-5 As shown, the arc extinguishing system includes two parallel arc extinguishing chambers 41. In a first direction, the arc inlets of the two arc extinguishing chambers 41 are spaced apart and opposite each other. Each arc extinguishing chamber 41 is located between a terminal 7 and a moving contact assembly 31. Each stationary contact 32 is disposed on one side of the arc inlet. In a second direction, a moving contact portion of the moving contact assembly 31 is spaced apart and opposite to a stationary contact 32. Figure 1 In the first direction, two stationary contacts 32 are arranged side by side, and each stationary contact 32 is located on the side of the arc inlet closer to the operating mechanism 2, so that the operating mechanism 2 drives the moving contact assembly 31 to move linearly in the second direction. The end of each arc-extinguishing chamber 41 away from the arc inlet is the exhaust end, and the exhaust end faces an adjacent terminal 7. Multiple arc-extinguishing grids 46 are arranged in the arc-extinguishing chamber 41 located between the arc inlet and the exhaust end. The multiple arc-extinguishing grids 46 are arranged at intervals in the second direction. After the arc enters through the arc inlet, it is extinguished after being cut by the arc-extinguishing grids 46. The exhaust gas generated by the arc extinguishing is discharged from the exhaust port of the exhaust end of the arc-extinguishing chamber 41.

[0040] Each arc-extinguishing chamber 41 is also equipped with a magnet assembly, which includes a permanent magnet 44 and a pair of magnetic conductive plates 45. In a second direction, the permanent magnet 44 is stacked with the arc-extinguishing chamber 41. Figure 4In this configuration, a permanent magnet 44 is disposed on the bottom surface of the arc-extinguishing chamber 41 facing away from the operating mechanism 2, and the size of the permanent magnet 44 is the same as the bottom surface size of the arc-extinguishing chamber 41. A pair of magnetic plates 45 are spaced apart in the third direction. The arc-extinguishing chamber 41 and the permanent magnet 44 are located between the pair of magnetic plates 45, with the two magnetic ends of the permanent magnet 44 respectively in contact with the pair of magnetic plates 45. The permanent magnet 44 and the magnetic plates 45 work together to generate an arc-initiating magnetic field. The arc-initiating magnetic field can cover the arc inlet and the exhaust end of the arc-extinguishing chamber 41. That is, in the third direction, the arc inlet and the exhaust end are both located between the pair of magnetic plates 45, so that the entire process of arc generation and extinguishing is within the arc-initiating magnetic field, and the arc is driven by the Lorentz force in the arc-initiating magnetic field, thereby improving the arc-initiating and arc-extinguishing efficiency.

[0041] In this embodiment, in the two sets of magnet assemblies, the magnetic poles of the two permanent magnets 44 face opposite directions. Figure 1 In the diagram, the N pole of the permanent magnet 44 on the left faces inwards from the paper, while the N pole of the permanent magnet 44 on the right faces outwards from the paper. This creates two arc-inducing magnetic fields with opposite directions within the two arc-extinguishing chambers 41 of the arc-extinguishing system, allowing the circuit breaker in this embodiment to meet the requirements of non-polarity wiring. Alternatively, the orientation of the magnetic poles of the permanent magnets 44 can be changed so that the magnetic poles of the two permanent magnets 44 face the same direction. For example, the N poles of the permanent magnets 44 on both sides can be modified to face inwards from the paper, thereby creating two arc-inducing magnetic fields with the same direction within the two arc-extinguishing chambers 41 of the arc-extinguishing system, allowing the circuit breaker to meet the requirements of polarity wiring.

[0042] In addition, in this embodiment, the permanent magnets 44 corresponding to the two arc-extinguishing chambers 41 are arranged side by side and spaced apart in the first direction, and in the second direction, each permanent magnet 44 is stacked with the arc-extinguishing chamber 41. Figure 1-3 In this configuration, the permanent magnet 44 is disposed on the bottom surface of the arc-extinguishing chamber 41 facing away from the operating mechanism 2. Preferably, the side of the permanent magnet 44 facing away from the arc-extinguishing chamber 41 is flush with the edge of the magnetic guide plate 45, thereby facilitating the maintenance of an external flatness. Furthermore, the magnetic guide plate 45 can be made of either a magnetic material or a magnetically conductive material. When the magnetic guide plate 45 is made of a magnet, it and the permanent magnet 44 can form an integrated U-shaped structure.

[0043] Furthermore, such as Figure 4As shown, each arc-extinguishing chamber 41 also includes a pair of gas-generating elements 48, which are spaced apart in a third direction. Each arc-extinguishing grid 46 is fixedly assembled between the pair of gas-generating elements 48. Two adjacent arc-extinguishing grids 46 are spaced apart and opposite each other in a second direction, forming an arc-extinguishing gap between them. Typically, one end of each arc-extinguishing grid 46 has an arc-extinguishing notch, which is opposite to the arc inlet. The other end of the arc-extinguishing grid 46 is adjacent to the exhaust end, so that the arc-extinguishing gap connects the arc inlet and the exhaust end. The arc-extinguishing notches of all the arc-extinguishing grids 46 are in the second direction. The arc-extinguishing groove is formed by connecting in the direction to the arc inlet; preferably, it also includes a pair of side plates spaced apart in the third direction, the gas generating element 48 is disposed between the pair of side plates, and each gas generating element 48 is fixedly connected to the adjacent side plate, and each arc-extinguishing grid plate 46 can be fixedly connected to the gas generating element 48 and the side plate at the same time, that is, the gas generating element 48 wraps around the legs on both sides of the arc-extinguishing notch, so that the gas generating element 48 is located on the opposite sides of the arc inlet in the third direction, and the two sides of each arc-extinguishing grid plate 46 can be inserted into the side plate respectively, ensuring the stable assembly of the arc-extinguishing grid plate 46.

[0044] like Figure 1 , 2 As shown, the arc extinguishing system also includes an exhaust channel 42. One end of the exhaust channel 42 is connected to the exhaust end of each arc extinguishing chamber 41, and the other end of the exhaust channel 42 is connected to an air outlet (not shown) provided on the housing 11. The exhaust gas discharged from the arc extinguishing chamber 41 is buffered by the exhaust channel 42 to prevent high-temperature exhaust gas from being discharged directly. In this embodiment, the air outlet is opened at the terminal 111. The air outlet and the terminal are located on the same side wall of the housing 11, and the air outlet corresponds to the position of the terminal 7 away from the operating hole. Thus, the exhaust channel 42 is set along the position of the terminal 7 away from the operating hole. Preferably, a plurality of blocking parts 421 are provided in the exhaust channel 42. Two adjacent blocking parts 421 are staggered and opposite each other. The blocking parts 421 change the airflow direction, which can further buffer the exhaust gas and prevent impurities from being ejected outside the circuit breaker.

[0045] The arc extinguishing system also includes an arc-initiating structure, which is located at the arc inlet and cooperates with the contact system. In this embodiment, the arc-initiating structure includes a moving arc-initiating part and a stationary arc-initiating plate 43. The moving arc-initiating part is preferably disposed on the moving contact assembly 31, and the stationary arc-initiating plate 43 cooperates with the stationary contact 32.

[0046] Specifically, such as Figure 1-3As shown, the moving contact assembly 31 includes a contact support 310 and a moving contact bridge 311. The moving contact bridge 311 is disposed on the contact support 310 along a first direction. Both ends of the moving contact bridge 311 extend beyond the contact support 310. The two ends of the moving contact bridge 311 serve as moving contact portions. Each moving contact portion is provided with a moving contact point. The moving contact point and the stationary contact point of the stationary contact 32 are spaced apart and opposite each other in a second direction. The end of each moving contact portion is deflected and extended away from the operating mechanism 2 to form a moving arc-inducing portion. The moving arc-inducing portion extends into the arc-extinguishing chamber 41. The contact support 310 is linked to the operating mechanism 2. Preferably, a connecting rod is connected between the lever and the contact support 310, and the operating mechanism 2 drives the contact support 310 to move along the second direction.

[0047] Each stationary contact 32 corresponds to the top surface of each arc-extinguishing chamber 41. That is, each stationary contact 32 includes a stationary contact plate. One end of the stationary contact plate is located on the side of the arc inlet closer to the operating mechanism 2. The stationary contact plate has a stationary contact point. One end of the stationary contact plate extending to the arc inlet is connected to a stationary arc-inducing plate 43. The other end of the stationary arc-inducing plate 43 extends into the arc-extinguishing chamber 41. The stationary arc-inducing plate 43 and the moving arc-inducing part are spaced apart and opposite each other in the second direction, and are used to introduce the arc between the moving contact part and the stationary contact 32 into the arc-extinguishing chamber 41. The middle part of the stationary contact plate is bent at least once, so that the other end of the stationary contact plate extends outside the arc inlet. Figure 1 , 2 In the middle, the other end of the stationary contact plate can extend along the side of each arc-extinguishing chamber 41 near the operating mechanism 2 for connection to the adjacent terminal block 7.

[0048] In addition, each circuit breaker pole 10 may also be provided with a protection mechanism that cooperates with the operating mechanism 2. In this embodiment, the protection mechanism includes a short circuit protection mechanism 5 and an overload protection mechanism 6. When a short circuit fault occurs, the short circuit protection mechanism 5 triggers the operating mechanism 2 to trip. When an overload fault occurs, the overload protection mechanism 6 triggers the operating mechanism 2 to trip.

[0049] Combination Figure 5 A second embodiment of the circuit breaker is provided.

[0050] like Figure 5 As shown, the circuit breaker includes a housing 11, an operating mechanism 2 and at least one circuit breaker pole 10 are provided inside the housing 11, and the opposite ends of the housing 11 serve as terminals 111. Each terminal 111 has an operating hole and a wiring port. The operating mechanism 2 and the handle mechanism linked with the operating mechanism 2 can adopt the structure of the first embodiment.

[0051] Each circuit breaker pole 10 includes a pair of terminals 7 identical to those in the first embodiment. The contact system also adopts a double-break structure, comprising a moving contact assembly 31 and two stationary contacts 32. Unlike the first embodiment, the moving contact assembly 31 is rotatably mounted between the two stationary contacts 32. The two stationary contacts 32 are rotationally symmetrically arranged on opposite sides of the moving contact assembly 31. The moving contact assembly 31 is driven to rotate by the operating mechanism 2, causing the two moving contact portions of the moving contact assembly 31 to simultaneously contact or separate from the two stationary contacts 32. In the second direction, each moving contact portion is spaced apart from one stationary contact 32. Figure 5 In the middle, the two stationary contacts 32 are the first stationary contact 321 and the second stationary contact 322, respectively. In the second direction, the first stationary contact 321 is located between the operating mechanism 2 and the moving contact assembly 31, and the second stationary contact 322 and the operating mechanism 2 are located on both sides of the moving contact assembly 31.

[0052] Each circuit breaker pole 10 also includes an arc-extinguishing system, similar to the first embodiment. The arc-extinguishing system includes two arc-extinguishing chambers 41, which are spaced apart in a first direction. In the figure, the two arc-extinguishing chambers 41 are arranged side by side along a direction slightly angled to the first direction. The arc inlets of the two arc-extinguishing chambers 41 are spaced opposite each other. The exhaust end of each arc-extinguishing chamber 41 is opposite to the terminal 7. A magnet assembly is also provided outside each arc-extinguishing chamber 41. The magnet assembly includes a permanent magnet 44 and a pair of magnetic conductive plates 45. In a second direction, the permanent magnet 44 and the stationary contact 32 are located on opposite sides of the same arc-extinguishing chamber 41. Figure 5 In the middle, the first stationary contact 321 is located on the left side of the arc-extinguishing chamber 41 near the operating mechanism 2, and the second stationary contact 322 is located on the right side of the arc-extinguishing chamber 41 opposite to the operating mechanism 2. Each pair of magnetic plates 45 are spaced apart and opposite each other in the third direction.

[0053] Unlike the first embodiment, the two arc-extinguishing chambers 41 form a rotationally symmetrical structure while side by side. Correspondingly, the magnet assembly that cooperates with each arc-extinguishing chamber 41 also forms a rotationally symmetrical structure; that is, the permanent magnet 44 outside each arc-extinguishing chamber 41 also forms a rotationally symmetrical structure, such as... Figure 5 As shown, the permanent magnet 44 corresponding to the left arc-extinguishing chamber 41 is located away from the operating mechanism 2, while the permanent magnet 44 corresponding to the right arc-extinguishing chamber 41 is located close to the operating mechanism 2.

[0054] Furthermore, the arc extinguishing system also includes an exhaust channel 42, the two ends of which are respectively connected to the exhaust end of an arc extinguishing chamber 41 and the air outlet opened in the outer casing 11. Each exhaust channel 42 may also be provided with a blocking part 421. In this embodiment, the two exhaust channels 42 corresponding to the two arc extinguishing chambers 41 also form a rotationally symmetrical structure. One end of each exhaust channel 42 is connected to the exhaust end of each arc extinguishing chamber 41 near the permanent magnet 44. In this embodiment, the air outlet is opened at the wiring terminal 111. Preferably, the air outlet and the wiring terminal are located on the same side wall of the outer casing 11.

[0055] In addition, the arc extinguishing system also includes an arc-initiating structure, which includes a stationary arc-initiating plate 43 and a moving arc-initiating part. The stationary arc-initiating plate 43 is connected to the stationary contact 32 and extends into the arc-extinguishing chamber 41. Figure 5 As shown, each stationary contact 32 includes the same stationary contact plate as in the first embodiment.

[0056] In this embodiment, the moving contact assembly 31 includes a rotating shaft 312 and a moving contact bridge 311. The rotating shaft 312 is connected to the lever of the operating mechanism 2 and is driven to rotate by the operating mechanism 2. The moving contact bridge 311 is arranged radially through the rotating shaft 312. The two ends of the moving contact bridge 311 extend to the opposite sides of the rotating shaft 312 as two moving contact portions. Each moving contact portion is spaced apart from a stationary contact 32 in the second direction. Of course, the end of each moving contact portion can also be provided with a moving arc-drawing portion.

[0057] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0058] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. An arc extinguishing system comprising two arc extinguishing chambers (41) arranged side by side, the arc entry ports of the two arc extinguishing chambers (41) being spaced apart from each other in a first direction, each arc extinguishing chamber (41) having an exhaust end at an end thereof away from the arc entry port, a plurality of arc extinguishing vanes (46) being arranged in a second direction in the arc extinguishing chamber (41) between the arc entry port and the exhaust end, characterized in that: Each arc-extinguishing chamber (41) is also equipped with a magnet assembly, which includes a permanent magnet (44) and a pair of magnetic guide plates (45). In the second direction, the permanent magnet (44) is stacked with the arc-extinguishing chamber (41). In the third direction, the arc-extinguishing chamber (41) and the permanent magnet (44) are located between each pair of magnetic guide plates (45). The two magnetic ends of the permanent magnet (44) are respectively attached to each pair of magnetic guide plates (45) to generate an arc-inducing magnetic field. The arc-inducing magnetic field covers the arc inlet and exhaust end of the arc-extinguishing chamber (41). The first direction, the second direction and the third direction are perpendicular to each other.

2. The arc-extinguishing system according to claim 1, characterized in that: The permanent magnets (44) of the two magnet components have opposite magnetic poles, so that the arc-inducing magnetic fields of the corresponding two arc-extinguishing chambers (41) are opposite in direction; or, the permanent magnets (44) of the two magnet components have the same magnetic pole, so that the arc-inducing magnetic fields of the corresponding two arc-extinguishing chambers (41) are in the same direction.

3. The arc-extinguishing system according to claim 1, characterized in that: The permanent magnets (44) corresponding to the two arc-extinguishing chambers (41) are arranged side by side and spaced apart in the first direction, or the two arc-extinguishing chambers (41) form a rotationally symmetrical structure, so that the permanent magnets (44) corresponding to the two arc-extinguishing chambers (41) form a rotationally symmetrical structure.

4. The arc-extinguishing system according to claim 1, characterized in that: The magnetic plate (45) is made of magnetic material or magnetically conductive material.

5. The arc-extinguishing system according to claim 1, characterized in that: Each arc-extinguishing chamber (41) also includes a pair of gas-generating elements (48) and / or side plates, each of the arc-extinguishing grid plates (46) being assembled between the pairs of gas-generating elements (48), or each of the arc-extinguishing grid plates (46) being assembled between the pairs of side plates, wherein in the third direction, the gas-generating elements (48) and the side plates are located between each pair of magnetic plates (45).

6. The arc extinguishing system according to claim 1, characterized in that: It also includes an exhaust channel (42), one end of which is connected to the exhaust end. The exhaust channel (42) is provided with a plurality of blocking parts (421), and two adjacent blocking parts (421) are staggered relative to each other.

7. The arc extinguishing system according to claim 1, characterized in that: A contact system is provided between the two arc-extinguishing chambers (41), the contact system including a moving contact assembly (31) and two stationary contacts (32). In a second direction, each stationary contact (32) is spaced apart from a moving contact portion of the moving contact assembly (31) at an arc inlet. In a third direction, the arc inlet is located between a pair of magnetic plates (45).

8. The arc-extinguishing system according to claim 7, characterized in that: Each of the stationary contacts (32) includes a stationary contact plate, one end of which extends to the arc inlet and is connected to a stationary arc-inducing plate (43) extending into the arc-extinguishing chamber (41), and the middle of the stationary contact plate is bent at least once so that the other end of the stationary contact plate extends outside the arc-extinguishing chamber (41). The moving contact assembly (31) includes a moving contact bridge (311), the two ends of which serve as moving contact portions and are spaced apart from a stationary contact (32) in a second direction. The end of each moving contact portion extends away from the operating mechanism (2) to form a moving arc-inducing portion, which extends into the arc-extinguishing chamber (41).

9. A circuit breaker, comprising a housing (11), wherein an operating mechanism (2) and at least one circuit breaker pole (10) are disposed within the housing (11), the circuit breaker pole (10) comprising a contact system, characterized in that: Each circuit breaker pole (10) further includes an arc extinguishing system as described in any one of claims 1-8.

10. The circuit breaker according to claim 9, characterized in that: The outer casing (11) is provided with terminals (7) at both ends. The terminals (7) correspond to the operation holes and wiring ports provided on the outer casing (11). The side wall of the outer casing (11) with wiring ports is also provided with an air outlet. An air outlet is connected to the exhaust end of each arc-extinguishing chamber (41) by an exhaust channel (42).

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