Circuit breaker

Abstract

The circuit breaker comprises a shell, an operating mechanism and at least one circuit breaker unit are arranged in the shell, the circuit breaker unit comprises a contact mechanism and an arc extinguishing system, the contact mechanism comprises two moving contact assemblies and two static contacts, at least one moving contact assembly is in linkage connection with the operating mechanism, the two moving contact assemblies are in linkage connection, and the two static contacts are in linkage connection with the arc extinguishing system. The two static contacts are respectively arranged at two sides of the opening of the arc extinguish chamber, the two moving contact assemblies are rotatably arranged between the two static contacts side by side, and the two moving contact assemblies extend into the arc extinguish chamber and are respectively matched with the two static contacts. According to the utility model, the two static contacts are respectively arranged at the two sides of the opening of the arc extinguish chamber, and the two moving contact assemblies extend into the arc extinguish chamber and are respectively matched with the two static contacts, so that the moving space of the moving contact assemblies can be increased, the arc extinguish chamber can be fully utilized, the breaking performance of the arc extinguish chamber can be improved, and meanwhile, a structure of separately arranging the arc extinguish chamber can be avoided; and the structure of the moving contact assembly is simplified.

Description

Technical Field

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

[0002] A circuit breaker is a switching device used to cut off and connect load circuits, and to cut off fault circuits to prevent accidents from expanding, thereby ensuring the safe operation of load circuits. In a circuit breaker, the breaking speed and opening distance of its contact mechanism are key parameters for providing breaking performance. In existing products, due to the limitation of internal space, the improvement is usually made by increasing the space for accommodating the arc extinguishing chamber. This structure has the following defects: first, the activity space of the moving contact assembly is reduced, and the arc extinguishing chamber that is too long cannot be used; second, the structure of the separate arc extinguishing chamber makes the structure of the moving contact assembly too complicated; third, in order to ensure that the arcing distance is small or zero arcing, an arcing cover is usually added on the outlet side of the arc extinguishing system, but it is inconvenient to install, occupies a lot of space and has a high cost. Summary of the invention

[0003] The purpose of the utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a circuit breaker, comprising a shell, wherein an operating mechanism and at least one circuit breaker unit are arranged in the shell, wherein the circuit breaker unit comprises a contact mechanism and an arc extinguishing system, wherein the contact mechanism comprises two moving contact assemblies and two static contacts, wherein at least one moving contact assembly is linked to the operating mechanism, and the two moving contact assemblies are linked to each other, wherein the arc extinguishing system comprises an arc extinguishing chamber, wherein the two static contacts are respectively arranged at both sides of an opening of the arc extinguishing chamber, wherein the two moving contact assemblies are rotatably arranged side by side between the two static contacts, and wherein the two moving contact assemblies extend into the arc extinguishing chamber and respectively cooperate with the two static contacts.

[0006] Preferably, the moving contact assembly includes a rotating shaft and a moving contact, at least one rotating shaft is linked to the operating mechanism, the two rotating shafts are linked to each other by a connecting rod mechanism or a gear transmission mechanism, and the moving contact cooperates with the rotating shaft drive to make the two moving contacts rotate towards each other and separate from the two static contacts respectively, or to make the two moving contacts rotate away from each other and contact the two static contacts respectively.

[0007] Preferably, the connecting rod mechanism includes a first connecting rod hinged between two rotating shafts; or, the connecting rod mechanism includes two second connecting rods, the first end of each second connecting rod is hinged on a rotating shaft, and the second ends of the two second connecting rods and the connecting rod assembly of the operating mechanism are hinged at one point.

[0008] Preferably, a guide groove is further provided in the shell, the central axis of the guide groove is perpendicular to the axis line connecting the two rotating shafts, and the second end of the second connecting rod and the hinge of the connecting rod assembly slide in cooperation with the guide groove to limit the moving trajectory of the connecting shaft.

[0009] Preferably, the gear transmission mechanism comprises two gear parts meshingly connected to each other, and each gear part is arranged along the circumferential outer side wall of a rotating shaft.

[0010] Preferably, a plurality of gear teeth forming a gear part are respectively arranged on adjacent sides of the two rotating shafts; or, a gear part is arranged around the circumferential side wall of one of the rotating shafts, and a plurality of gear teeth forming the gear part are arranged on the other rotating shaft; or, a gear part is arranged around the circumferential outer side walls of the two rotating shafts.

[0011] Preferably, the arc extinguishing system includes an air duct and an exhaust port, and the operating mechanism, contact mechanism, arc extinguishing chamber and air duct are arranged in sequence in the outer shell, and the air duct connects the two ends of the arc extinguishing chamber with the exhaust port opened in the outer shell, and the exhaust port corresponds to between the two ends of the arc extinguishing chamber.

[0012] Preferably, a plurality of spaced-apart eliminating components are arranged in the air passage, and a slot for mounting the eliminating components is provided in the air passage.

[0013] Preferably, the de-loosening member is provided with a plurality of exhaust holes, and the exhaust holes of two adjacent de-loosening members are staggered and opposed to each other.

[0014] Preferably, two ends of the air duct are respectively provided with connecting ports, each connecting port is connected with one end of the arc extinguishing chamber, and the exhaust port is connected with the middle part of the air duct.

[0015] Preferably, a plurality of arc extinguishing grids are provided in the arc extinguishing chamber, and the plurality of arc extinguishing grids are arranged around the arc extinguishing chamber to form an arc extinguishing zone connected to the opening, and the two moving contact assemblies swing in the arc extinguishing zone.

[0016] Preferably, the arc extinguishing system further comprises a guide portion, wherein the guide portion is located between two connecting ports, and the highest point of the guide portion corresponds to between two moving contact assemblies, and the lowest point of the guide portion is connected to each connecting port.

[0017] Preferably, a drainage portion is further provided in the airway, and the drainage portion is protruding from the inner wall of the airway to change the inner diameter of the airway.

[0018] Preferably, the housing includes a first assembly cavity and a second assembly cavity which are stacked, the operating mechanism and the arc extinguishing system are respectively arranged in the first assembly cavity and the second assembly cavity, the rotating shaft is rotatably arranged at the connection between the first assembly cavity and the second assembly cavity, the moving contact rotates in the second assembly cavity, and an air duct is provided on the side of the second assembly cavity away from the first assembly cavity, and the second assembly cavity is provided with an exhaust port in the middle of the corresponding air duct.

[0019] Preferably, the housing comprises an upper cover, a middle cover and a base which are assembled in sequence, a first assembly cavity is formed between the upper cover and the middle cover, and a second assembly cavity is formed between the middle cover and the base.

[0020] The base includes a first base and a second base assembled with each other, the side wall of the second base is provided with a second bottom plate, the first bottom plate and the second bottom plate of the first base are spaced apart from each other to form an air passage, and the exhaust port is opened on the first base or the second base.

[0021] In the circuit breaker of the utility model, two static contacts are respectively arranged on both sides of the opening of the arc extinguishing chamber, and two moving contact assemblies extend into the arc extinguishing chamber and cooperate with the two static contacts respectively, which can not only increase the activity space of the moving contact assembly, but also make full use of the arc extinguishing chamber to improve its breaking performance. At the same time, it can also avoid the structure of separately setting up the arc extinguishing chamber, which is conducive to simplifying the structure of the moving contact assembly.

[0022] In addition, the two moving contacts can rotate synchronously towards or away from each other, which increases the opening distance of the contact mechanism and can also multiply the opening speed of the contact mechanism, which is beneficial to improving the breaking performance of the circuit breaker.

[0023] In addition, the two moving contact assemblies are linked through a connecting rod mechanism or a gear transmission mechanism, and the linkage effect and matching stability are good. In particular, a guide groove is provided in the housing to constrain the moving trajectory of the two second connecting rods, which further improves the matching stability.

[0024] In addition, the arc extinguishing system is provided with an air duct, which connects the two ends of the arc extinguishing chamber with the exhaust port, prolonging the flow process of the exhaust gas in the outer shell. In particular, a plurality of extinguishing parts are arranged in the air duct to avoid adding an arcing cover on the outlet side, simplifying the assembly process, occupying a small space and having a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the circuit breaker of the utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the circuit breaker of the utility model. Figure 1 ;

[0027] Figure 3 This is a schematic diagram of the internal structure of the circuit breaker of the utility model. Figure 2 ;

[0028] Figure 4 It is a schematic diagram of the cooperation between the operating mechanism and the contact mechanism in the utility model when the switch is opened;

[0029] Figure 5 It is a schematic diagram of the cooperation between the operating mechanism and the contact mechanism in the utility model when closing the switch;

[0030] Figure 6 It is a schematic diagram of the cooperation between the operating mechanism and the contact mechanism in the utility model when tripping;

[0031] Figure 7 This is a schematic diagram of the structure of the base in the utility model. Figure 1 ;

[0032] Figure 8 This is a schematic diagram of the structure of the base in the utility model. Figure 2 ;

[0033] Fig. 9 It is a schematic diagram of the cooperation between the rotating shaft and the first connecting rod in the utility model;

[0034] Fig.10 It is a schematic diagram of the cooperation between the rotating shaft and the two second connecting rods in the utility model;

[0035] Fig.11 It is a structural schematic diagram of the rotating shaft and the gear part of the utility model;

[0036] Fig.12 It is a structural schematic diagram of the rotating shaft and the gear in the utility model;

[0037] Reference numerals:

[0038] 1-housing, 101-exhaust port, 102-avoidance slot, 11-upper cover, 12-middle cover, 13-base, 131-first base, 1311-first bottom plate, 132-second base, 1321-second bottom plate, 14-flow guide, 2-operating mechanism, 21-operating member, 22-traction rod, 23-jump buckle, 24-first transmission rod, 25-second transmission rod, 26-lock buckle, 27-shake Arm spring, 3-contact mechanism, 31-rotating shaft, 32-moving contact, 33-static contact, 34-connecting rod mechanism, 341-first connecting rod, 342-second connecting rod, 343-connecting shaft, 35-gear, 351-gear part, 4-arc extinguishing system, 41-arc extinguishing chamber, 42-arc extinguishing grid, 43-arc starting plate, 44-air duct, 441-connecting port, 45-freezing part, 5-thermal magnetic tripping system. DETAILED DESCRIPTION

[0039] The following is a further description of the specific implementation of the circuit breaker of the present utility model in conjunction with the embodiments given in the accompanying drawings. The circuit breaker of the present utility model is not limited to the description of the following embodiments.

[0040] The circuit breaker includes a shell 1, in which an operating mechanism 2 and at least one circuit breaker unit are arranged, a traction rod 22 is arranged on one side of the operating mechanism 2, the circuit breaker unit includes a pair of wiring assemblies (not shown), a contact mechanism 3 and an arc extinguishing system 4, the wiring assembly is used for external wiring, the contact mechanism 3 is connected between the pair of wiring assemblies, the contact mechanism 3 includes two groups of moving contact assemblies and two static contacts 33, a moving contact assembly of at least one circuit breaker unit is linked to the operating mechanism 2, and the two moving contact assemblies in the same contact mechanism 3 are linked, preferably, a partial area of ​​each static contact 33 is used for external wiring, so that the wiring assembly can be omitted, the cost is reduced, and the wiring process is simplified; the arc extinguishing system 4 includes an arc extinguishing chamber 41, the arc extinguishing chamber 41 is arranged on one side of the contact mechanism 3 to extinguish the arc generated when the contact mechanism 3 is disconnected, and the exhaust gas generated by the arc extinguishing chamber 41 is discharged through the exhaust port 101 opened on the shell 1.

[0041] Furthermore, at least one circuit breaker unit also includes a thermal-magnetic tripping system 5, which is arranged on one side of the operating mechanism 2 and connected between the moving contact assembly and the static contact 33. When a short circuit or overload fault occurs, the thermal-magnetic tripping system 5 drives the traction rod 22 to rotate to trigger the operating mechanism 2 to trip.

[0042] The improvement of the present application is that the two stationary contacts 33 are respectively arranged on both sides of the opening of the arc extinguishing chamber 41, the two moving contact assemblies are rotatably arranged side by side between the two stationary contacts 33, and the two moving contact assemblies extend into the arc extinguishing chamber 41 and cooperate with the two stationary contacts 33 respectively.

[0043] In this way, the two static contacts 33 are respectively arranged on both sides of the opening of the arc extinguishing chamber 41, and the two moving contact assemblies extend into the arc extinguishing chamber 41 and cooperate with the two static contacts 33 respectively, which can not only increase the activity space of the moving contact assembly, but also make full use of the arc extinguishing chamber 41 to improve its breaking performance. At the same time, it can also avoid the structure of separately setting up the arc extinguishing chamber 41, which is conducive to simplifying the structure of the moving contact assembly.

[0044] Specifically, each moving contact assembly includes a rotating shaft 31 and a moving contact 32, at least one rotating shaft 31 is linked to the operating mechanism 2, and the two rotating shafts 31 are linked to each other through a connecting rod mechanism 34 or a gear transmission mechanism, and the moving contact 32 is driven and matched with the rotating shaft 31, so that the two moving contacts 32 rotate toward each other and are separated from the two static contacts 33, or the two moving contacts 32 rotate in opposite directions and are in contact with the two static contacts 33. The two moving contacts 32 are synchronously rotated toward each other or in opposite directions, which increases the opening distance of the contact mechanism 3 and can also double the opening speed of the contact mechanism 3, which is conducive to improving the breaking performance of the circuit breaker.

[0045] Furthermore, the arc extinguishing system 4 further comprises an air passage 44 and an exhaust port 101, wherein the operating mechanism 2, the contact mechanism 3, the arc extinguishing chamber 41 and the air passage 44 are sequentially arranged in the housing 1, wherein the air passage 44 can be formed by the space between the housing 1 and the arc extinguishing chamber 41, and the two ends of the arc extinguishing chamber 41 are connected to the exhaust port 101 by the air passage 44, and the exhaust port 101 corresponds to between the two ends of the arc extinguishing chamber 41, and the exhaust gas is discharged through the air passage 44, which prolongs the flow process of the exhaust gas in the housing 1. Preferably, in the air passage 44, the exhaust gas is discharged from the exhaust port 101, and the exhaust gas is discharged from the exhaust port 101. A plurality of spaced-apart extinguishing components 45 are provided in the air duct 44, which can achieve zero arcing and avoid adding an arcing cover on the outlet side. The extinguishing component 45 can be snapped into the air duct 44, which simplifies the assembly process and makes the overall space smaller. At the same time, the air duct 44 utilizes the space between the outer shell 1 and the arc extinguishing chamber 41, and its size in the height direction of the circuit breaker is smaller, so that the size of the extinguishing component 45 assembled therein is also smaller. Compared with setting an arcing cover on the exhaust side, it occupies less space and has lower cost.

[0046] Combination Figure 1-12 A specific embodiment of a circuit breaker is provided.

[0047] like Figure 1-3 As shown, the circuit breaker comprises a housing 1, in which an operating mechanism 2 and at least one circuit breaker unit are arranged, and the housing 1 comprises a first assembly cavity and a second assembly cavity which are stacked. Figure 2 In the embodiment, the first assembly cavity is located above the second assembly cavity, the operating mechanism 2 is arranged in the first assembly cavity, the number of the second assembly cavity is one or more, two adjacent second assembly cavities are arranged in parallel, and an avoidance groove 102 is provided at the connection between the first assembly cavity and each second assembly cavity, and the avoidance groove 102 connects the first assembly cavity with the second assembly cavity. In this embodiment, the housing 1 includes a base 13, a middle cover 12 and an upper cover 11 which are assembled in sequence, a first assembly cavity is formed between the upper cover 11 and the middle cover 12, a second assembly cavity is formed between the middle cover 12 and the base 13, and the avoidance groove 102 is provided on the middle cover 12.

[0048] like Figure 2-6As shown, each circuit breaker unit includes a contact mechanism 3 and an arc extinguishing system 4, a pair of wiring assemblies are arranged at opposite ends of the housing 1, and the wiring assemblies are preferably arranged in the first assembly cavity. The structure of the wiring assembly can adopt the existing technology, and the contact mechanism 3 is connected between the pair of wiring assemblies. The contact mechanism 3 includes two moving contact assemblies and two static contacts 33. The two moving contact assemblies are arranged side by side and linked. The two moving contact assemblies are electrically connected by soft / hard connection. In this embodiment, each circuit breaker unit omits a pair of wiring assemblies, and a part of the area of ​​each static contact 33 is used for external wiring; the arc extinguishing system 4 is arranged in the second assembly cavity, so that the arc extinguishing system 4 has more assembly space, and the arc extinguishing system 4 includes an arc extinguishing chamber 41, and the arc extinguishing chamber 41 The opening corresponds to the avoidance groove 102, the two static contacts 33 are respectively arranged on both sides of the opening of the arc extinguishing chamber 41, the two moving contact assemblies extend into the arc extinguishing chamber 41 through the avoidance groove 102, at least one moving contact assembly is linked to the operating mechanism 2, and the operating mechanism 2 drives the two moving contact assemblies to rotate toward each other and separate from the two static contacts 33 respectively, or, the operating mechanism 2 drives the two moving contact assemblies to rotate back to back and contact with the two static contacts 33 respectively. In this way, the two moving contact assemblies fully utilize the length of the arc extinguishing chamber 41 during the movement process, which can not only increase the activity space of the moving contact assembly, but also make full use of the arc extinguishing chamber 41 to improve its breaking performance. At the same time, it can also avoid the structure of separately setting the arc extinguishing chamber 41, which is conducive to simplifying the structure of the moving contact assembly.

[0049] In this embodiment, the length of the arc extinguishing chamber 41 is parallel to the direction of the line between the two stationary contacts 33, that is, Figure 2 , 3 The left-right direction of the arc extinguishing chamber 41 is the length direction, and the height direction of the arc extinguishing chamber 41 is the distance from the opening of the arc extinguishing chamber 41 to the side opposite to the opening, that is, Figure 2 , 3 The vertical direction of the arc extinguishing chamber 41 is the height direction, and the width direction of the arc extinguishing chamber 41 is perpendicular to the length and height directions of the arc extinguishing chamber 41, that is, Figure 2 , 3 The middle arc extinguishing chamber 41 is perpendicular to the direction of the paper surface.

[0050] A plurality of arc extinguishing grids 42 are arranged in the arc extinguishing chamber 41. The plurality of arc extinguishing grids 42 are arranged around the arc extinguishing chamber 41 to form an arc extinguishing area connected to the opening. Figure 2 , 3 In the embodiment, a plurality of arc extinguishing grids 42 are arranged in an arc extinguishing chamber 41 to form a U-shaped structure, and two moving contact assemblies swing in the arc extinguishing zone; two stationary contacts 33 are respectively located on both sides of the opening, and an arc striking member 43 is connected between each stationary contact 33 and the adjacent arc extinguishing grid 42.

[0051] like Figure 1-3, 7 and 8, the arc extinguishing system 4 also includes an air duct 44 and an exhaust port 101, wherein the air duct 44 is arranged in a second assembly cavity away from the avoidance groove 102, so that the operating mechanism 2, the contact mechanism 3, the arc extinguishing chamber 41 and the air duct 44 are sequentially arranged in the shell 1, and a connecting port 441 is respectively opened at both ends of the air duct 44, and each connecting port 441 is respectively connected to one end of the arc extinguishing chamber 41, and the exhaust port 101 is opened in the middle of the air duct 44. Preferably, the distance from the exhaust port 101 to the two connecting ports 441 is equal.

[0052] In this embodiment, the air passage 44 is located between the side of the arc extinguishing chamber 41 facing away from the opening and the housing 1. Preferably, the air passage 44 is formed by the base 13. Figure 1 , 2 As shown in FIGS. 7 and 8 , the base 13 includes a first base 131 and a second base 132, wherein the first base 131 and the second base 132 are assembled. Figure 7 , 8 As shown, the second base 132 is provided with a second bottom plate 1321, the first bottom plate 1311 of the first base 131 and the second bottom plate 1321 are spaced apart from each other to form an air passage 44, and the exhaust port 101 can be provided on the first base 131 or on the second base 132. Figure 7 As shown, the side wall of the first base 131 close to the first bottom plate 1311 is provided with an exhaust port 101. Figure 8 As shown, the exhaust port 101 is opened on the side wall of the second base 131, the exhaust port 101 corresponds to the middle part of the airway 44, and the connecting port 441 is opened on the second bottom plate 1321. When two exhaust ports 101 are arranged in the shell 1, the exhaust ports 101 of two adjacent circuit breaker units are not connected. At this time, the two exhaust ports 101 are respectively located on the two opposite side walls of the shell 1.

[0053] In this embodiment, the arc extinguishing chamber 41 corresponds to an air passage 44, and the width of the air passage 44 is similar to the width of the arc extinguishing chamber 41. Preferably, the width of the air passage 44 is slightly larger than the width of the arc extinguishing chamber 41. As other structures, the number of air passages 44 can be two, and in this case, two adjacent air passages 44 are arranged side by side, but the width of each air passage 44 is smaller than the width of the arc extinguishing chamber 41. The cross-sectional shape of the air passage 44 is approximately rectangular, but the cross-sectional shape of the air passage 44 is not limited to rectangular, and can also be circular or other irregular shapes. Figure 2 , 3As shown, a plurality of spaced-apart deionized parts 45 are arranged in the air passage 44, and a plurality of slots for mounting the deionized parts 45 are arranged in the air passage 44. Each deionized part 45 is in a plate shape, which is convenient for being connected with the slots. A plurality of exhaust holes are provided on the plate surface of the deionized part 45. The deionized part 45 can be made of a metal mesh plate, and preferably, the exhaust holes of two adjacent deionized parts 45 are staggered relative to each other, which can effectively increase the passage path of the high-temperature gas, thereby increasing the contact time and accelerating the cooling, further improving the arc extinguishing effect, and also further blocking the metal particles. Of course, the deionized part 45 can also be omitted.

[0054] Preferably, the arc extinguishing system 4 also includes a guide portion 14, which is opposite to the side of the open arc extinguishing chamber 41 and is opposite to the guide portion 14. The guide portion 14 is located between the two connecting ports 441. The protruding height of the guide portion 14 changes with the distance to the connecting ports 441. The highest point of the guide portion 14 corresponds to between the two moving contact assemblies, and the lowest point of the guide portion 14 is connected to each connecting port 441. In the present embodiment, the guide portion 14 is arranged on the side of the second bottom plate 1321 facing the arc extinguishing chamber 41. The guide portion 14 can be a cone protruding from the second bottom plate 1321, or it can be an arc-shaped surface formed on the surface of the second bottom plate 1321 with a high middle and low sides, so as to facilitate the introduction of exhaust gas into the connecting ports 441.

[0055] Furthermore, a drainage portion (not shown) may be provided in the air duct 44. The drainage portion protrudes from the inner wall of the air duct 44 to change the inner diameter of the air duct 44, so as to facilitate guiding the exhaust gas discharged from the arc extinguishing chamber 41 to the exhaust port 101. For example, the drainage portion is formed by the inner wall of the base 13. In the present embodiment, the drainage portion may be formed by the first bottom plate 1311 and / or the second bottom plate 1321. The protruding height of the drainage portion gradually changes with the distance from the exhaust port 101. Preferably, the drainage portion makes the contact surface between the air duct 44 and the exhaust gas arc-shaped, and the height is adjusted at the position closest to the exhaust port 101 to achieve connection with the exhaust port 101.

[0056] In this embodiment, the two moving contact assemblies are linked by a connecting rod mechanism 34 to ensure linkage stability, wherein the connecting rod mechanism 34 includes at least one connecting rod, and of course, the number of connecting rods can also be more; of course, the two moving contact assemblies can also be linked by a gear transmission mechanism.

[0057] Specific as Figure 2-6As shown in Figures 9-12, the two moving contacts 32 have the same and symmetrical structures, and the two moving contact assemblies are assembled and rotated side by side. Each moving contact assembly includes a rotating shaft 31 and a moving contact 32, wherein the rotating shaft 31 is arranged at the junction of the first assembly cavity and the second assembly cavity, and an assembly groove is opened in the middle of the rotating shaft 31. One end of the moving contact 32 is arranged in the assembly groove, and the other end of the moving contact 32 passes through the avoidance groove 102 and the opening of the arc extinguishing chamber 41 and is located in the arc extinguishing chamber 41. The other end of the moving contact 32 is provided with a moving contact for cooperating with the static contact 33; the two static contacts 33 are respectively arranged on both sides of the opening of the arc extinguishing chamber 41, and each static contact 33 includes a static contact plate, one end of the static contact plate is located in the first assembly cavity for connecting with the outside, and the middle part of the static contact plate is bent so that the other end of the static contact plate extends along one side of the opening of the arc extinguishing chamber 41 into the arc extinguishing chamber 41, and a static contact is provided at one end of the static contact plate located in the arc extinguishing chamber 41.

[0058] like Fig. 9 As shown, the connecting rod mechanism 34 includes a first connecting rod 341. A first connecting rod 341 is connected between two moving contact assemblies of the same contact mechanism 3. The first connecting rod 341 is a straight rod. Both ends of the first connecting rod 341 are hinged to the two rotating shafts 31 respectively.

[0059] like Fig.10 As shown, the link mechanism 34 includes two second links 342, and the first ends of the two second links 342 are respectively hinged to the two rotating shafts 31. Fig.10 The two second connecting rods 342 have the same structure. Each second connecting rod 342 is a rod body with a certain curvature. The length of each second connecting rod 342 is less than the distance between the axis lines of the two rotating shafts 31 and greater than half of the axis line of the two rotating shafts 31, so that the second ends of the two second connecting rods 342 and the connecting shaft 343 move correspondingly between the rotating shafts 31, and the connecting shaft 343 is hinged to the connecting rod assembly of the operating mechanism 2.

[0060] Furthermore, a guide groove is provided in the housing 1, and the moving track of the connecting shaft 343 is limited by the guide groove. The guide groove is a linear groove, thereby limiting the moving track of the connecting shaft 343 to be a straight line. The central axis of the guide groove is perpendicular to the axis connecting the two rotating shafts 31. The guide groove can be provided on the side wall of the housing 1, or on the bracket of the operating mechanism 2. Of course, the lengths of the two second connecting rods 342 can also be different. In this case, the moving track may not be a straight line, and its moving track is longer. Its guide groove and the second connecting rod 342 need to be set according to actual conditions.

[0061] like Fig.11 , 12As shown, the two moving contact assemblies of the same contact mechanism 3 are linked by a gear transmission mechanism, and the gear transmission mechanism includes two gear parts 351 meshing with each other, and a gear part 351 is provided on the circumferential outer wall of the rotating shaft 31, wherein the gear part 351 can be formed by a gear 35 or an incomplete gear 35 fixed to the rotating shaft 31 by means of embedding or screws, or a plurality of gear teeth forming the gear part 351 can be directly provided on the circumferential outer wall of the rotating shaft 31, that is, Fig.11 In the embodiment, the adjacent sides of the two rotating shafts 31 are respectively provided with a plurality of gear teeth forming a gear portion 351, or the adjacent sides of the two rotating shafts 31 are meshedly connected through the gear portion 351 of the incomplete gear 35. Fig.12 In the figure, a circle of gear teeth is arranged around the circumferential outer wall of the two rotating shafts 31 , which can also be understood as a gear portion 351 is arranged around the circumferential outer wall of the rotating shaft 31 , or the two rotating shafts 31 are respectively equipped with a gear 35 .

[0062] like Figure 2 , 3 As shown, each circuit breaker unit also includes a thermal magnetic tripping system 5, which is arranged in the first assembly cavity and located between a static contact 33 and a moving contact assembly. When a short circuit fault or a fault occurs, the thermal magnetic tripping system 5 drives the traction rod 22 to trigger the operating mechanism 2 to trip. In this embodiment, the structure and matching process of the thermal magnetic tripping system 5 and the operating mechanism 2 can adopt the existing technology. For example, the thermal magnetic tripping mechanism 5 includes a thermal tripper and a magnetic tripper. The magnetic tripper includes a yoke, an armature bracket, an armature and a reset member. The yoke is spaced opposite to the armature, one end of the armature is hinged to the armature bracket, and the other end of the armature cooperates with the traction rod 22. A reset member is connected between the armature bracket and the armature; the thermal tripper includes a bimetallic strip and a connecting plate, one end of the connecting plate is respectively connected to the fixed end and the yoke of the bimetallic strip, and an adjusting screw is provided at the movable end of the bimetallic strip, and the adjusting screw cooperates with the traction rod 22.

[0063] In this embodiment, if Figure 1-6 As shown in , 10, the operating mechanism 2 and the traction rod 22 are rotatably arranged in the first assembly cavity respectively, the operating mechanism 2 includes a pair of brackets, a rocker arm, a trip buckle 23, a lock buckle 26 and a connecting rod assembly, the pair of brackets are arranged in the first assembly cavity of the housing 1 with intervals, preferably all the circuit breaker units correspond to the pair of brackets, the rocker arm is rotatably supported on the pair of brackets and an operating member 21 is arranged on the rocker arm, the operating member 21 extends outside the housing 1 to drive the circuit breaker to open and close, the rocker arm is connected to the rocker arm shaft arranged on the connecting rod assembly through a rocker arm spring 27, the trip buckle 23, the lock buckle 26 and the traction rod 22 are rotatably assembled on the inner upper part of the pair of brackets respectively, wherein the trip buckle 23 and the lock buckle 26 are snap-fitted, and the lock buckle 26 is limitedly matched with the traction rod 22; as shown in Figure 4-6As shown, the connecting rod assembly includes a first transmission rod 24 and a second transmission rod 25. A rocker shaft is provided at one end of the second transmission rod 25. The first transmission rod 24 and one end of the second transmission rod 25 are hinged through the rocker shaft. The other end of the first transmission rod 24 is connected to the jump buckle 23. The other end of the second transmission rod 25 is used to drive the moving contact assembly. The other end of the second transmission rod 25 is hinged to two second connecting rods 342 through a connecting shaft 343.

[0064] like Figure 4 As shown in FIG. 1 , when the circuit breaker is opened, the tripping catch 23 is limited by the locking catch 26, and the hinge point between the second transmission rod 25 and the connecting rod mechanism 34 is in the first position (for example, higher than the axis position of the moving contact assembly) under the action of the rocker spring 27, the first transmission rod 24, and the second transmission rod 25, and the connecting rod mechanism 34 drives the two moving contact assemblies to rotate toward each other, so that each moving contact assembly is separated from the corresponding static contact 33; Figure 5 As shown in FIG. 1 , when the circuit breaker is closed, the trip button 23 is limited by the lock button 26, and the hinge point between the second transmission rod 25 and the connecting rod mechanism 34 is in the second position (for example, lower than the axis position of the moving contact assembly) under the action of the rocker spring 27, the first transmission rod 24 and the second transmission rod 25, and the connecting rod mechanism 34 drives the two moving contact assemblies to rotate in opposite directions, so that each moving contact assembly contacts the corresponding stationary contact 33; Figure 6 As shown, when the circuit breaker is free to trip, the lock catch 26 is rotated by the traction rod 22 and is no longer limited, the trip catch 23 is actuated, and the hinge point of the second transmission rod 25 and the connecting rod mechanism 34 is in the first position under the action of the rocker spring 27, the first transmission rod 24 and the second transmission rod 25, and the connecting rod mechanism 34 drives the two moving contact assemblies to rotate toward each other, so that each moving contact assembly is separated from the corresponding static contact 33. It should be noted that the first position and the second position of the hinge point of the second transmission rod 25 and the connecting rod mechanism 34 are relative positions, and the first position is closer to the rocker arm than the second position, and is related to the length of the connecting rod mechanism 34 and the connection position with the connecting rod mechanism 34.

[0065] exist Fig. 9 , 11 In 12, the other end of the second transmission rod 25 in the connecting rod assembly can be directly hinged on the rotating shaft 31, and the moving trajectory of the hinge point of the second transmission rod 25 and the rotating shaft 31 is not a straight line. When closing, opening and tripping, the hinge point of the second transmission rod 25 and the rotating shaft 31 also switches between the first position and the second position accordingly.

[0066] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0067] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising a housing (1), wherein an operating mechanism (2) and at least one circuit breaker unit are arranged in the housing (1), wherein the circuit breaker unit comprises a contact mechanism (3) and an arc extinguishing system (4), wherein the contact mechanism (3) comprises two moving contact assemblies and two stationary contacts (33), wherein at least one moving contact assembly is linked to the operating mechanism (2), and the two moving contact assemblies are linked to each other, and wherein the arc extinguishing system (4) comprises an arc extinguishing chamber (41), wherein: Two stationary contacts (33) are respectively arranged on both sides of the opening of the arc extinguishing chamber (41), two moving contact assemblies are rotatably arranged side by side between the two stationary contacts (33), and the two moving contact assemblies extend into the arc extinguishing chamber (41) and respectively cooperate with the two stationary contacts (33).

2. The circuit breaker according to claim 1, characterized in that: The movable contact assembly comprises a rotating shaft (31) and a movable contact (32), at least one rotating shaft (31) is linked to the operating mechanism (2), the two rotating shafts (31) are linked to each other via a connecting rod mechanism (34) or a gear transmission mechanism, the movable contact (32) and the rotating shaft (31) are driven to cooperate so that the two movable contacts (32) rotate towards each other and are separated from the two stationary contacts (33) respectively, or the two movable contacts (32) rotate in opposite directions and are in contact with the two stationary contacts (33) respectively.

3. The circuit breaker according to claim 2, characterized in that: The connecting rod mechanism (34) includes a first connecting rod (341) hinged between two rotating shafts (31); or, the connecting rod mechanism (34) includes two second connecting rods (342), the first end of each second connecting rod (342) is hinged on a rotating shaft (31), and the second ends of the two second connecting rods (342) and the connecting rod assembly of the operating mechanism (2) are hinged at one point.

4. The circuit breaker according to claim 3, characterized in that: A guide groove is also provided in the housing (1), the central axis of the guide groove being perpendicular to the axis connecting the two rotating shafts (31), and the second end of the second connecting rod (342) and the hinge of the connecting rod assembly are slidably matched with the guide groove to limit the moving trajectory of the connecting shaft (343).

5. The circuit breaker according to claim 2, characterized in that: The gear transmission mechanism comprises two gear parts (351) meshingly connected with each other, and each gear part (351) is arranged along the circumferential outer wall of a rotating shaft (31).

6. The circuit breaker according to claim 5, characterized in that: A plurality of gear teeth forming a gear portion (351) are respectively arranged on adjacent sides of the two rotating shafts (31); or, a gear portion (351) is arranged around the circumferential side wall of one rotating shaft (31), and a plurality of gear teeth forming the gear portion (351) are arranged on the other rotating shaft (31); or, a gear portion (351) is arranged around the circumferential outer side walls of the two rotating shafts (31).

7. The circuit breaker according to claim 1, characterized in that: The arc extinguishing system (4) comprises an air passage (44) and an exhaust port (101); the operating mechanism (2), the contact mechanism (3), the arc extinguishing chamber (41) and the air passage (44) are sequentially arranged in the housing (1); the air passage (44) connects the two ends of the arc extinguishing chamber (41) with the exhaust port (101) provided in the housing (1); and the exhaust port (101) corresponds to between the two ends of the arc extinguishing chamber (41).

8. The circuit breaker according to claim 7, characterized in that: A plurality of spaced-apart anti-loosening components (45) are arranged in the air passage (44), and a slot for mounting the anti-loosening components (45) is provided in the air passage (44).

9. The circuit breaker according to claim 8, characterized in that: The de-loosening member (45) is provided with a plurality of exhaust holes, and the exhaust holes of two adjacent de-loosening members (45) are staggered and opposed to each other.

10. The circuit breaker according to claim 7, 8 or 9, characterized in that: The two ends of the air passage (44) are respectively provided with communication ports (441), each communication port (441) is communicated with one end of the arc extinguishing chamber (41), and the exhaust port (101) is communicated with the middle part of the air passage (44).

11. The circuit breaker according to claim 1 or 7, characterized in that: A plurality of arc extinguishing grids (42) are arranged in the arc extinguishing chamber (41). The plurality of arc extinguishing grids (42) are arranged around the arc extinguishing chamber (41) to form an arc extinguishing zone connected to the opening, and the two moving contact assemblies swing in the arc extinguishing zone.

12. The circuit breaker according to claim 7, characterized in that: The arc extinguishing system (4) further comprises a guide portion (14), wherein the guide portion (14) is located between two connecting ports (441), and the highest point of the guide portion (14) corresponds to between two moving contact assemblies, and the lowest point of the guide portion (14) is connected to each connecting port (441).

13. The circuit breaker according to claim 7, characterized in that: The airway (44) is also provided with a drainage portion, which is protruding from the inner wall of the airway (44) and is used to change the inner diameter of the airway (44).

14. The circuit breaker according to claim 7, 12 or 13, characterized in that: The housing (1) comprises a first assembly cavity and a second assembly cavity which are stacked, the operating mechanism (2) and the arc extinguishing system (4) are respectively arranged in the first assembly cavity and the second assembly cavity, the moving contact assembly comprises a rotating shaft (31) and a moving contact (32), the rotating shaft (31) is rotatably arranged at the connection between the first assembly cavity and the second assembly cavity, the moving contact (32) rotates in the second assembly cavity, an air passage (44) is arranged on a side of the second assembly cavity away from the first assembly cavity, and an exhaust port (101) is opened in the middle of the second assembly cavity corresponding to the air passage (44).

15. The circuit breaker according to claim 14, characterized in that: The housing (1) comprises an upper cover (11), a middle cover (12) and a base (13) which are assembled in sequence, a first assembly cavity is formed between the upper cover (11) and the middle cover (12), and a second assembly cavity is formed between the middle cover (12) and the base (13). The base (13) comprises a first base (131) and a second base (132) which are assembled with each other, the side wall of the second base (132) is provided with a second bottom plate (1321), the first bottom plate (1311) and the second bottom plate (1321) of the first base (131) are spaced apart from each other to form an air passage (44), and the exhaust port (101) is opened on the first base (131) or the second base (132).

Images