Circuit breaker

Abstract

A circuit breaker includes a housing, an operating mechanism, and at least one circuit breaker pole. Each circuit breaker pole includes a pair of terminal connectors, a contact mechanism, an arc extinguishing system, an instrument transformer, and a short-circuit protection mechanism. The operating mechanism, the contact mechanism, and the arc extinguishing system are sequentially arranged along a first direction from the operating end to the terminal end. The terminal end is provided with at least a pair of terminal sockets spaced apart in a second direction. An air outlet communicating with the arc extinguishing system is provided between each pair of terminal sockets. The instrument transformer, the contact mechanism, and the short-circuit protection mechanism are sequentially arranged in the housing along the second direction. The first direction is perpendicular to the second direction. In the present invention, both the air outlet and the terminal sockets are provided at the terminal end of the housing, making only the temperature of the terminal end relatively high as a whole. The side surface connecting the terminal end and the operating end is used to arrange the instrument transformer and the short-circuit protection mechanism, which will not be interfered by the exhaust gas and also makes full use of the internal space.

Description

Technical Field

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

[0002] A circuit breaker refers to a switching device that can close, carry, and interrupt the current under normal circuit conditions and can also close, carry, and interrupt the current under abnormal circuit conditions within a specified time. In existing molded case circuit breakers, there are the following defects: First, the exhaust ports of the arc extinguishing system and the air outlet ports communicating with the exhaust ports are usually distributed on the side of the circuit breaker. Since the temperature of the exhaust gas is relatively high, it is impossible to arrange components on the side of the circuit breaker or the performance is unstable under the interference of the exhaust gas; Second, the terminal is arranged at one end of the housing, and the air outlet is arranged on the side wall of the housing, making the housing have multiple high-temperature surfaces, resulting in a relatively high overall temperature rise, and it is difficult to ensure the performance and safety when multiple products are used side by side; Third, the internal layout is complex, the components are relatively scattered, and a modular structure cannot be formed, which is not conducive to assembly; Fourth, there is no space for independent wiring inside, resulting in difficult wiring and easy occurrence of poor contact. Summary of the Invention

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

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The present invention provides a circuit breaker, including a housing. The opposite ends of the housing are respectively an operating end and a terminal end. An operating mechanism and at least one circuit breaker pole are arranged inside the housing. Each circuit breaker pole includes a pair of terminals, a contact mechanism, an arc extinguishing system, an instrument transformer, and a short-circuit protection mechanism. The operating mechanism, the contact mechanism, and the arc extinguishing system are sequentially arranged along a first direction from the operating end to the terminal end. At least a pair of wiring sockets spaced apart in a second direction are provided at the terminal end. An air outlet communicating with the arc extinguishing system is provided between each pair of wiring sockets. The instrument transformer, the contact mechanism, and the short-circuit protection mechanism are sequentially arranged inside the housing along the second direction. The first direction is perpendicular to the second direction.

[0006] Preferably, an inner housing for accommodating the circuit breaker pole is further arranged inside the housing. An exhaust port is provided at one end of the inner housing, and the exhaust port is correspondingly communicated with the air outlet at the terminal end.

[0007] Preferably, two adjacent circuit breaker poles are arranged side by side in a third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0008] Preferably, a wiring cavity is formed between the outer side wall of the inner shell and the inner side wall of the outer shell and is arranged along the first direction. In the same breaker pole, a first conductive plate arranged along the first direction is connected between the current transformer and the adjacent terminal. The current transformer is arranged in the inner shell, and the first conductive plate is arranged in the wiring cavity.

[0009] Preferably, the current transformer is fixedly attached to the plate surface of the first conductive plate, and the axis of the central hole of the current transformer is parallel to the second direction and perpendicular to the plate surface of the first conductive plate. A conductive busbar is arranged in the central hole of the current transformer, and the conductive busbar is connected between the first conductive plate and the contact mechanism.

[0010] Preferably, the wiring cavity is divided into a first wiring cavity and a second wiring cavity. In the second direction, the first wiring cavity is located between the outer side wall of the inner shell and the inner side wall of the outer shell. The first conductive plate of each breaker pole is arranged in the first wiring cavity, and a plurality of heat dissipation holes are formed in the side wall of the outer shell corresponding to the first wiring cavity.

[0011] In the third direction, the second wiring cavity is located between the outer side wall of the inner shell and the inner side wall of the outer shell. A circuit board is arranged in the outer shell. The signal end of the circuit board is located in the second wiring cavity and is exposed from the wiring port opened at the terminal end.

[0012] Preferably, a terminal installation groove is arranged in the wiring cavity near the wiring socket, and the terminal is arranged in the terminal installation groove.

[0013] Preferably, the short-circuit protection mechanism includes a second conductive plate, a yoke, an armature, and a first bracket. The second conductive plate is arranged along the first direction and passes through the gap between the yoke and the armature. The two ends of the yoke are respectively bent along the two side edges of the second conductive plate and extend towards the direction close to the armature, so that the yoke and the armature cooperate to surround the outside of the second conductive plate, and a magnetic gap is formed by the cooperation of the yoke and the armature on one side of the second conductive plate. The armature moves linearly along the first direction relative to the first bracket and the second conductive plate. A pull rod connected to the armature is used to drive the operating mechanism to trip, and the pull rod and / or the armature are slidably matched with the first bracket to limit the movement track of the armature.

[0014] Preferably, an installation groove is formed in the side wall of the inner shell. The yoke and the armature are relatively embedded in the installation groove at intervals in the first direction, and the armature moves in the installation groove along the first direction. The first bracket and the pull rod are located between the inner shell and the outer shell. One end of the second conductive plate is located inside the inner shell and is parallel and opposite to the first bracket. The first bracket and the second conductive plate cooperate to leave a moving space outside the inner shell, and the armature and the pull rod move in the moving space.

[0015] Preferably, one end of the second conductive plate extends outside the inner housing and is connected to an adjacent terminal. The other end of the second conductive plate is located inside the inner housing and is folded back to form a static contact plate parallel to and opposite the second conductive plate. Static contacts are provided on the side of the static contact plate facing the mutual inductor.

[0016] Preferably, the arc extinguishing system includes an arc extinguishing chamber and an exhaust passage. The contact mechanism, the arc extinguishing chamber, and the exhaust passage are sequentially arranged in the inner housing along a first direction. The inlet of the exhaust passage communicates with the side position of the exhaust end of the arc extinguishing chamber, and the outlet of the exhaust passage communicates with the exhaust port.

[0017] Preferably, a pressure regulating member is rotatably arranged in the exhaust passage. The pressure regulating member is driven by the air pressure difference between the exhaust passage and the exhaust end to keep the exhaust passage in communication or blocked with the exhaust end.

[0018] Preferably, the distance between the movable end and the connecting end of the pressure regulating member is greater than the inner diameter of the inlet, so that the movable end extends to the middle of the exhaust passage and moves in the exhaust passage. The pressure regulating member is connected with a limiting member, and the limiting member cooperates with the side wall of the exhaust passage to limit the rotation amplitude of the movable end.

[0019] Preferably, a plurality of arc extinguishing members arranged at intervals in the first direction are clamped inside one end of the exhaust passage away from the arc extinguishing chamber. A plurality of communication holes are formed in each arc extinguishing member, and the communication holes of adjacent two arc extinguishing members are arranged staggeredly.

[0020] Preferably, the contact mechanism includes a movable contact assembly and a static contact that cooperate with each other. The movable contact assembly includes a rotating shaft and a movable contact. The rotating shaft is rotatably assembled and is drivingly connected to the operating mechanism. A contact cavity is provided in the middle of the rotating shaft. One end of the movable contact is located outside the contact cavity and is provided with a movable contact. The static contact includes a static contact plate. The static contact plate is arranged along the first direction and is provided with a static contact. The movable contact and the static contact are spaced opposite to each other in the second direction.

[0021] Preferably, the movable contact assembly further includes a baffle coaxially connected to the movable contact. The baffle includes at least one connecting arm. The connecting arm is fixedly attached to the side wall of the movable contact. The connecting arm is connected with a shielding portion. The shielding portion is located in the contact cavity and horizontally covers the middle area of the movable contact facing away from the movable contact.

[0022] Preferably, the movable contact includes a plurality of movable contact pieces arranged side by side in a third direction. Adjacent two movable contact pieces are separated by a connecting arm.

[0023] Preferably, an accessory slot is provided at one end of the inner shell close to the operating end. In the third direction, the accessory slot is located on one side of the operating mechanism. A through hole is provided at the bottom of the accessory slot. A feedback device cooperating with the rotating shaft is provided in the accessory slot. An auxiliary switch module is provided in the space between the inner shell and the outer shell between the accessory slot and the operating mechanism.

[0024] Preferably, a pair of feedback devices spaced apart in the second direction are provided in the accessory slot, and the rotating shaft is provided with a toggle portion, which extends into the accessory slot from a through hole of the accessory slot and swings between the pair of feedback devices.

[0025] Preferably, the operating mechanism includes a rotatably assembled tripping shaft, a tripping shaft is connected to the tripping shaft, the rotating shaft is linked to the tripping shaft, and the auxiliary switch module includes at least two second micro switches arranged in parallel in a third direction, and during the closing process, at least one second micro switch is triggered by the tripping shaft before the moving contact contacts the static contact, and during the opening process, at least another second micro switch is triggered by the rotating shaft before the moving contact separates from the static contact.

[0026] The circuit breaker of the present invention has an air outlet and a wiring socket both arranged at the wiring terminal of the shell, so that only the temperature of the wiring terminal is higher as a whole; the side connected between the wiring terminal and the operating terminal is used to arrange a mutual inductor and a short-circuit protection mechanism, which will not be disturbed by exhaust gas and fully utilizes the internal space.

[0027] In addition, the circuit breaker poles are arranged in the outer shell through the inner shell, which facilitates the formation of a modular structure and simplifies the assembly process.

[0028] In addition, a wiring cavity is provided between the outer shell and the inner shell. In particular, the conductive plate, the signal end of the circuit board and the wiring terminals are all arranged outside the inner shell, and heat dissipation holes are opened on the side wall of the outer shell corresponding to the conductive plate, which is convenient for wiring and takes heat dissipation into consideration, thereby avoiding excessive temperature inside the circuit breaker.

[0029] In addition, the armature and the pull rod in the short-circuit protection mechanism move along the first direction, and their moving trajectory is a straight line, which has the characteristic of occupying a small space and makes the internal structure more compact.

[0030] In addition, the arc extinguishing chamber and the exhaust channel are arranged along the first direction, which is conducive to increasing the space of the arc extinguishing chamber.

[0031] In addition, a pressure regulating member is provided in the exhaust passage, which keeps the exhaust passage connected to the exhaust end or blocks the connection under the drive of the air pressure difference to prevent exhaust gas back-spray. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the circuit breaker of the present invention (heat dissipation hole);

[0033] Figure 2 It is a schematic structural diagram (terminal) of the circuit breaker of the present invention;

[0034] Figure 3 It is a schematic structural diagram of the circuit breaker of the present invention in the state of shell decomposition;

[0035] Figure 4 It is an exploded view of the circuit breaker of the present invention;

[0036] Figure 5 It is a schematic structural diagram of the second end cover in the present invention;

[0037] Figure 6 It is a schematic structural diagram of the wire routing board in the present invention;

[0038] Figure 7 It is a schematic structural diagram of the inner shell in the present invention (the end with an exhaust port);

[0039] Figure 8 It is a schematic structural diagram of the inner shell in the present invention (the end with an accessory slot);

[0040] Figure 9 It is a cross-sectional view of the rotating shaft and the moving contact in the present invention;

[0041] Figure 10 It is a schematic structural diagram of the moving contact and the baffle in the present invention;

[0042] Figure 11 It is an exploded schematic diagram of the moving contact and the baffle in the present invention;

[0043] Figure 12 It is a schematic structural diagram of the baffle in the present invention;

[0044] Figure 13 It is a schematic structural diagram of the first moving contact piece in the present invention;

[0045] Figure 14 It is a schematic structural diagram of the second moving contact piece in the present invention;

[0046] Figure 15 It is a schematic structural diagram of the arc extinguishing system and the inner shell in the present invention;

[0047] Figure 16 It is an exploded schematic diagram of the arc extinguishing system and the inner shell in the present invention;

[0048] Figure 17 It is a schematic structural diagram of the pressure regulating member in the present invention (the first embodiment);

[0049] Figure 18 It is a schematic structural diagram of the pressure regulating member in the present invention (the second embodiment);

[0050] Figure 19Schematic diagram of the motion state of the pressure regulating member in the present invention (second embodiment);

[0051] Figure 20 Schematic diagram of the cooperation between the short - circuit protection mechanism and the inner shell in the present invention;

[0052] Figure 21 Schematic diagram of the structure of the short - circuit protection mechanism in the present invention;

[0053] Figure 22 Schematic diagram of the structure of the first cover body cooperating with the short - circuit protection mechanism in the present invention;

[0054] Figure 23 Schematic diagram of the structure of the pull rod in the present invention;

[0055] Figure 24 Front view of the pull rod in the present invention;

[0056] Figure 25 Schematic diagram of the structure of the magnetic yoke in the present invention;

[0057] Figure 26 Schematic diagram of the structure of the armature in the present invention;

[0058] Figure 27 Schematic diagram of the structure of the push rod in the present invention;

[0059] Figure 28 Schematic diagram of the structure of the mutual inductor and the second conductive plate in the present invention;

[0060] Figure 29 Exploded view of the mutual inductor and the second conductive plate in the present invention;

[0061] Figure 30 Schematic diagram of the structure of the terminal in the present invention;

[0062] Figure 31 Exploded view of the terminal in the present invention;

[0063] Figure 32 Exploded view of the terminal assembly in the present invention;

[0064] Figure 33 Schematic diagram of the structure of a pair of clamping grid plates in the present invention;

[0065] Figure 34 Schematic diagram of the structure of the rotating shaft and the feedback device in the present invention;

[0066] Figure 35 Schematic diagram of the structure of the rotating shaft and the feedback device in the disassembled state in the present invention;

[0067] Figure 36 Schematic diagram of the cooperation between the rotating shaft and a pair of feedback devices in the present invention;

[0068] Figure 37 The structure of the auxiliary switch module in the present invention is shown in FIG. Figure 1 ;

[0069] Figure 38 The structure of the auxiliary switch module in the present invention is shown in FIG. Figure 2 ;

[0070] Figure 39 The structure of the auxiliary switch module in the present invention is shown in FIG. Figure 3 ;

[0071] Figure 40 is a schematic structural diagram of the third bracket in the present invention;

[0072] Figure 41 It is a structural schematic diagram of the first toggle member in the present invention;

[0073] Figure 42 is a schematic structural diagram of the second toggle member in the present invention;

[0074] Reference numerals:

[0075] 11-housing, 101-first end cover, 1102-second end cover, 1103-first side wall, 1104-second side wall, 111-operating hole, 112-wiring socket, 113-air outlet, 114-wiring port, 115-heat dissipation hole, 1161-first wiring cavity, 1162-second wiring cavity, 117-isolating plate, 12-inner shell, 121-first cover body, 1211-positioning protrusion, 122-second cover body, a1-second fixing part, a2-second groove, 123-exhaust port, 124-accessory groove, 125-terminal mounting groove, 126-second bracket, 127-partitioning part, 13-wiring board, 131-wire positioning part, 14-cover plate, 2-operating mechanism, 21-jump buckle shaft , 22-trip buckle, 23-traction rod, 231-push rod, 2311-trip trigger part, 3-contact mechanism, 31-rotating shaft, 311-sliding part, 312-contact cavity, 32-moving contact, 320-moving contact piece, 3201-first moving contact piece, 3202-second moving contact piece, 321-moving contact point, 322-positioning protrusion, 323-card slot, 324-guide part, 325-arc protrusion, 326-first connecting part 326, 327-second connecting part, 33-baffle, 3301-first connecting hole, 3302-second connecting hole, 331-connecting arm, 332-shielding part, 3321-arc convex surface, 34-static contact, 341-static contact plate, 342-static contact point, 4-arc extinguishing system, 41 -arc extinguishing chamber, 410-arc extinguishing chamber, 42-exhaust channel, 421-inlet, 43-pressure regulating member, 431-connecting end, 432-movable end, 433-abutting portion, 434-limiting member, 435-hollow area, 44-arc extinguishing member, 5-transformer, 51-connection portion, 52-first conductive plate, 53-connection row, 531-connector 531, 532-connection pin, 54-fastener, 6-short circuit protection mechanism, 61-second conductive plate, 62-yoke, 621-first suction wall, 6211-first suction surface, 63-armature, 631-second suction wall 631, 6311-second suction surface, 64-first bracket 64, 65-pull rod, 650-pull rod body, 651-slide groove, 6 52-tripping drive unit, 661-first reset member, 662-second reset member, 7-connecting terminal, 71-conductive bar, 711-clamping portion, 712-limiting protrusion, 713-fixing hole, 72-terminal assembly, 7211-support frame, 7212-support shaft, 7220-clamping grid, 72201-first clamping section, 72202-second clamping section, 72203-straight section, 7221-first clamping end, 7222-second clamping end, 7223-limiting groove, 7224-assembly groove, 723-spring, 73-signal end, 8-feedback device, 811-upper cover, 812-lower cover, 82-first micro switch, 83-buffer, 9-auxiliary switch module, 91-first toggle member,911 - First connecting boss, 912 - First driving part, 92 - Second toggling part, 921 - Second connecting end, 922 - Second driving part, 923 - Linkage part, 93 - Second microswitch, 94 - Third bracket, 941 - First assembly groove, 942 - Second assembly groove, 95 - Third reset part., Detailed implementation manners

[0076] The following embodiments given in conjunction with the accompanying drawings further illustrate the detailed implementation manners of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the descriptions of the following embodiments.

[0077] The circuit breaker includes a housing 11. The opposite ends of the housing 11 serve as an operating end and a wiring end respectively. An operating hole 111 is provided in the operating end, and at least a pair of wiring sockets 112 are provided in the wiring end. An operating mechanism 2 and at least one circuit breaker pole are arranged in the housing 11. The operating mechanism 2 is connected with an operating member. The operating member extends from the operating hole 111 provided in the housing 11 to the outside of the housing 11 for manually driving the operating mechanism 2. Of course, the operating mechanism 2 can also be driven by a control module. The control module includes a circuit board, a motor and a transmission assembly. A controller is arranged on the circuit board. The controller drives the motor to start and stop. The motor drives the operating mechanism 2 to rotate for opening and closing through the transmission assembly.

[0078] As Figure 3 、 4 shown, each circuit breaker pole includes a pair of wiring terminals 7. A contact mechanism 3 is connected between the pair of wiring terminals 7. The contact mechanism 3 includes a moving contact assembly and a static contact 34. The moving contact assembly is drivingly connected with the operating mechanism 2. By driving the operating mechanism 2, the moving contact assembly is driven to contact or separate from the static contact 34 to connect or disconnect the main circuit of each circuit breaker pole. An arc extinguishing system 4 is arranged on one side of the contact mechanism 3. The arc generated by the breaking of the contact mechanism 3 is extinguished by the arc extinguishing system 4. The exhaust gas generated by arc extinguishing is discharged through an air outlet 113 provided in the housing 11.

[0079] Each circuit breaker pole further includes a current transformer 5 and a short - circuit protection mechanism 6. The current transformer 5 is connected to the main circuit of each circuit breaker pole. That is, the conductor connected between the contact mechanism 3 and the wiring terminal 7 passes through the central hole of the current transformer 5. The current transformer 5 is connected to the control module and is used for feeding back a current signal to the control module. The short - circuit protection mechanism 6 cooperates with the operating mechanism 2. When a short - circuit fault occurs in the main circuit of the circuit breaker pole, the short - circuit protection mechanism 6 drives the operating mechanism 2 to trip and cut off the power.

[0080] For convenience of description, the connection direction from the operating end to the wiring end is taken as the first direction. That is, Figure 1 、 2 the direction of the X - axis inFigure 1 , 2 The direction of the Z-axis is the second direction, and the direction of the Y-axis is the third direction.

[0081] The improvement of this application lies in that, as Figure 3 , 4 shown, the operating mechanism 2, the contact mechanism 3, and the arc extinguishing system 4 are sequentially arranged along the first direction from the operating end to the wiring end. The wiring end is provided with at least a pair of wiring sockets 112 spaced apart in the second direction. An air outlet 113 communicating with the arc extinguishing system 4 is provided between each pair of wiring sockets 112. The current transformer 5, the contact mechanism 3, and the short-circuit protection mechanism 6 are sequentially arranged in the housing 11 along the second direction.

[0082] In this way, both the air outlet 113 and the wiring sockets 112 are arranged at the wiring end of the housing 11, making only the temperature of the wiring end relatively high as a whole. The side between the wiring end and the operating end is used to arrange the current transformer 5 and the short-circuit protection mechanism 6, which will not be interfered by the exhaust gas and also makes full use of the internal space.

[0083] Preferably, as Figure 3 , 4 , 7, 8, 15, and 16 shown, an inner housing 12 for accommodating the breaker pole is further provided in the housing 11. An exhaust port 123 is provided at one end of the inner housing 12, and the exhaust port 123 is correspondingly communicated with the air outlet 113 at the wiring end. Assembling the breaker pole through the inner housing 12 is conducive to forming a modular structure and simplifies the assembly process. When there are two or more breaker poles in the inner housing 12, the adjacent two breaker poles are arranged side by side in the third direction. The inner housing 12 is configured with exhaust ports 123 matching the number of breaker poles, and the housing 11 is provided with air outlets 113 matching the number of breaker poles.

[0084] Furthermore, as Figure 7 , 8 shown, a wiring cavity is formed between the outer side wall of the inner housing 12 and the inner side wall of the housing 11 along the first direction. In the same breaker pole, the current transformer 5 and the adjacent wiring terminal 7 are connected by a first conductive plate 52. The first conductive plate 52 is arranged in the wiring cavity along the first direction. The current transformer 5 is located in the inner housing 12. Preferably, the wiring terminal 7 is arranged in the wiring cavity between the inner housing 12 and the housing 11, that is, a terminal installation groove 125 is provided in the wiring cavity near the wiring socket 112, and the wiring terminal 7 is correspondingly arranged in the terminal installation groove 125. In this way, both the first conductive plate 52 and the wiring terminal 7 are arranged between the inner housing 12 and the housing 11, avoiding the high temperature during energization from affecting the normal operation of the components inside the breaker pole. In addition, as Figure 1 , 3As shown in FIGS. 3 and 4, a plurality of heat dissipation holes 115 are formed in the side wall of the housing 11 opposite to the first conductive plate 52. That is, heat dissipation holes 115 are formed in the side wall of the housing 11 that forms the wiring cavity for assembling the first conductive plate 52, which is conducive to heat dissipation and reduces the temperature rise.

[0085] Furthermore, as Figure 20 , 21 shown, the short-circuit protection mechanism 6 is an electromagnetic release. The short-circuit protection mechanism 6 includes a second conductive plate 61, a yoke 62, an armature 63, and a first bracket 64. The second conductive plate 61 is arranged along the first direction and passes through the gap between the yoke 62 and the armature 63. The two ends of the yoke 62 are bent along the two side edges of the second conductive plate 61 and extend towards the direction close to the armature 63, so that the yoke 62 and the armature 63 cooperate to surround the outside of the second conductive plate 61, and a magnetic gap is formed by the cooperation of the yoke 62 and the armature 63 on one side of the second conductive plate 61, enabling the armature 63 to move linearly along the first direction relative to the first bracket 64 and the second conductive plate 61. The pull rod 65 connected to the armature 63 is used to drive the operating mechanism 2 to trip. The pull rod 65 and / or the armature 63 are slidably engaged with the first bracket 64 to limit the movement trajectory of the armature 63. The pull rod 65 drives the operating mechanism 2 to trip along the first direction. Such linear movement of both the armature 63 and the pull rod 65 along the first direction has the characteristic of occupying a small space, making the internal structure more compact.

[0086] Combined with Figure 1 - 42 A specific embodiment of a circuit breaker is provided.

[0087] As Figure 1 - 8 shown, the circuit breaker includes a housing 11. An operating mechanism 2 and an inner housing 12 are arranged between the operating end and the wiring end of the housing 11. The operating mechanism 2 and the inner housing 12 are arranged along the first direction. The operating mechanism 2 is located between the inner housing 12 and the operating end. The operating member connected to the operating mechanism 2 extends out of the housing 11 through the operating hole 111 formed in the operating end. The wiring end is provided with three pairs of wiring sockets 112 arranged in parallel in the third direction. Each pair of wiring sockets 112 are spaced opposite to each other in the second direction, and an air outlet 113 is formed between each pair of wiring sockets 112. One end of the inner housing 12 is provided with three exhaust ports 123 arranged in parallel in the third direction. Each exhaust port 123 corresponds to an air outlet 113; a space serving as a wiring cavity is left between the outer side wall of the inner housing 12 and the inner side wall of the housing 11; a wiring port 114 is further arranged at the side position of the wiring end. Preferably, the wiring end is provided with a pair of wiring ports 114 spaced apart in the third direction.

[0088] As Figure 3 , 4As shown in FIGS. 7 and 8, three breaker poles arranged side by side in the third direction are provided inside the inner shell 12. Each breaker pole includes a pair of terminal blocks 7, and each pair of terminal blocks 7 corresponds to a pair of wiring sockets 112 of the outer shell 11 respectively. A contact mechanism 3 is connected between the pair of terminal blocks 7. An arc extinguishing system 4 is provided on one side of the contact mechanism 3. In this embodiment, the operating mechanism 2, the contact mechanism 3, and the arc extinguishing system 4 are arranged in sequence along the first direction. One end of the arc extinguishing system 4 of each breaker pole away from the contact mechanism 3 communicates with an exhaust port 123 of the inner shell 12; a current transformer 5 and a short-circuit protection mechanism 6 are also provided inside each breaker pole. The current transformer 5, the contact mechanism 3, and the short-circuit protection mechanism 6 are arranged in sequence along the second direction inside the outer shell 11, that is, the current transformer 5 and a terminal block 7 are arranged along the first direction in the inner shell 12, and the first conductive plate 52 connected between the current transformer 5 and the adjacent terminal block 7 is arranged along the first direction in the wiring cavity. The short-circuit protection mechanism 6 and the other terminal block 7 are arranged along the second direction on the other side of the inner shell 12.

[0089] In addition, as Figure 3 、 4 、8, 34 - 39 shown, an accessory module is also provided inside the outer shell 11. The accessory module is arranged side by side with the operating mechanism 2 in the third direction. The accessory module includes an auxiliary switch module 9, a feedback device 8, a release, etc. Preferably, an accessory slot 124 is provided at one end of the inner shell 12. The feedback device 8 is arranged in the accessory slot 124. The auxiliary switch module 9 and the release are located in the space between the inner shell 12 and the outer shell 11 between the accessory slot 124 and the operating mechanism 2, and the auxiliary switch module 9 and the release are arranged side by side in the second direction. The auxiliary switch module 9, the feedback device 8, and the release, etc. are connected to the control module in the breaker. The control module includes a circuit board, and the circuit board is provided with a controller. The auxiliary switch module 9 and the feedback device 8 can feed back signals to the controller. A signal terminal 73 for external wiring is provided on the circuit board, and the signal terminal 73 exposes from the wiring port 114.

[0090] Combined with Figure 1 - 5 There is provided a structure of the outer shell 11 applicable to this embodiment. The outer shell 11 includes a pair of end caps arranged at intervals. For the convenience of description, the two end caps are the first end cap 1101 and the second end cap 1102 respectively. The first end cap 1101 is the operating end and is provided with an operating hole 111. The second end cap 1102 is the wiring end. A space for assembling the accessory module is left between the operating end and one end of the inner shell 12. Three pairs of wiring sockets 112 arranged side by side in the third direction are provided at the wiring end. Each pair of wiring sockets 112 are spaced opposite in the second direction. An air outlet 113 is opened in the area between each pair of wiring sockets 112. At least one wiring port 114 is opened at the side position of the second end cap 1102. Figure 2 - 5In it, a wiring port 114 is provided on each side of the second end cover 1102, and the three air outlets 113 are located between the two wiring ports 114; two pairs of side walls are connected between a pair of end covers, and one pair of spaced-apart side walls is the first side wall 1103, and a plurality of spaced-apart heat dissipation holes 115 are provided on the first side wall 1103. Figure 1 - 4 In it, the plurality of heat dissipation holes 115 form a rectangular heat dissipation area, and a plurality of heat dissipation areas arranged in rows and columns are provided on the first side wall 1103, and the adjacent two rows or two columns of heat dissipation areas can be arranged in a staggered manner, and the other pair of spaced-apart side walls is the second side wall 1104.

[0091] Preferably, as Figure 2 、 5 shown, the second end cover 1102 is provided with two partition plates 117, and each partition plate 117 is used to isolate two adjacent pairs of wiring sockets 112, and the adjacent two air outlets 113 are also separated by the partition plate 117, so as to avoid mutual influence between adjacent two breaker poles and ensure the use safety; further, each partition plate 117 is assembled with the second end cover 1102 in a plug-in manner, that is, a slot is provided on the second end cover 1102, and each partition plate 117 is plugged into a slot.

[0092] Combined with Figure 3 、 4 、7 and 8, an inner shell 12 structure applied to this embodiment is provided. One end of the inner shell 12 close to the first end cover 1101 is provided with an accessory slot 124 and an avoidance slot, and the operating mechanism 2 is linked with each breaker pole through the avoidance slot. In the third direction, the accessory slot 124 and the operating mechanism 2 are spaced apart. One end of the inner shell 12 close to the second end cover 1102 is provided with three juxtaposed exhaust ports 123, and each exhaust port 123 corresponds to an air outlet 113 of the first end cover 1101. At least one wiring cavity is left between the outer side wall of the inner shell 12 and the inner side wall of the outer shell 11. One end of the wiring cavity is adjacent to the accessory slot 124. In this embodiment, four wiring cavities are formed between the inner shell 12 and the outer shell 11, and the wiring cavities are divided into a first wiring cavity 1161 and a second wiring cavity 1162. The wiring cavity located between the first side wall 1103 and the inner shell 12 is the first wiring cavity 1161, and the wiring cavity located between the second side wall 1104 and the inner shell 12 is the second wiring cavity 1162. Thus, the first wiring cavity 1161 and the second wiring cavity 1162 are respectively located on the adjacent sides of the inner shell 12. One end of the first wiring cavity 1161 is communicated with the wiring socket 112, and one end of the second wiring cavity 1162 is communicated with the wiring port 114. The signal terminal 73 connected to the circuit board is arranged in the second wiring cavity 1162 and exposed from the wiring port 114. When the breaker is plugged and unplugged, signal connection can be carried out at the same time. Of course, the circuit board can also be directly arranged in the second wiring cavity 1162.

[0093] AsFigure 4 , 7 As shown, the inner shell 12 includes a first cover body 121 and a second cover body 122 assembled with each other, and three parallel chamber structures are formed between the first cover body 121 and the second cover body 122, each chamber is used to assemble a circuit breaker pole, and a partition is provided between two adjacent chambers, and the partition extends to the side of the first cover body 121 and the second cover body 122 facing away from the chamber, so that the side of the first cover body 121 facing away from the second cover body 122 and the side of the second cover body 122 facing away from the first cover body 121 respectively form three parallel concave cavities, and each concave cavity is spaced apart from the first side wall 1103 of the outer shell 11 to form a first wiring cavity 1161; further, as Figure 7 As shown, at least one pair of terminal mounting grooves 125 are provided on opposite sides outside one end of the inner shell 12 , and each terminal mounting groove 125 is located in a region of a first wiring cavity 1161 close to the wiring port.

[0094] like Figure 7 As shown, the outer wall of the inner shell 12 adjacent to the first wiring cavity 1161 is provided with a strip groove with a certain width, which can be formed by splicing the first cover body 121 and the second cover body 122, or can be separately opened on the first cover body 121 or the second cover body 122, and the strip groove is spaced from the second side wall 1104 of the outer shell 11 to form a second wiring cavity 1162. Of course, at least one convex ridge can also be provided on the outer wall of the inner shell 12 adjacent to the first wiring cavity 1161, and the convex ridge abuts against the second side wall 1104 of the outer shell 11, so that the second wiring cavity 1162 is formed between the convex ridge, the second side wall 1104 and the outer wall of the inner shell 12. It should be noted that the convex ridge, the strip groove and the concave cavity on the outer side of the inner shell 12 mainly play a role of separation, and are not necessary structures.

[0095] Further, such as Figure 3 , 4 , 6 and 7, a cover plate 14 may be further disposed in the first wiring cavity 1161, and a plurality of heat dissipation holes 115 are provided on the surface of the cover plate 14; a wiring board 13 may be disposed in the second wiring cavity 1162, and a plurality of wire positioning portions 131 are provided on the side of the wiring board 13 facing the second side wall 1104, as shown in FIG. Figure 6 As shown, two rows of spaced-apart wire positioning portions 131 are provided on the wiring board 13. The two rows of wire positioning portions 131 are respectively provided along two sides of the wiring board 13 and are offset relative to each other. In addition, the circuit board of the control module can be provided in the second wiring cavity 1162, and of course, can also be provided in the first wiring cavity 1161.

[0096] Each chamber has an exhaust port 123 at one end. Figure 7Among them, each exhaust port 123 is formed by enclosing one end of the first cover body 121 and one end of the second cover body 122. Of course, the exhaust port 123 can also be separately opened at one end of the first cover body 121 or one end of the second cover body 122.

[0097] It should be noted that in this embodiment, both the outer shell 11 and the inner shell 12 are split structures, which are convenient for disassembly and assembly. The outer shell 11 can adopt an integral structure, and the inner shell 12 can also adopt an integral structure, but there may be a defect of inconvenient disassembly and assembly.

[0098] Combined with Figure 3 、 4 、20 and 37 - 39 provide an operating mechanism 2 applied to this embodiment. The operating mechanism 2 includes a pair of side plates arranged at intervals. The side plates can be supported between the inner shell 12 and the first end cover 1101. The rocker arm is rotatably assembled on the pair of side plates. A jump buckle shaft 21 and a lock buckle shaft are rotatably arranged between the pair of side plates. The jump buckle shaft 21 and the lock buckle shaft are respectively located on opposite sides of the space between the pair of side plates. The jump buckle shaft 21 and the lock buckle shaft are respectively connected with a jump buckle 22 and a lock buckle. One end of the jump buckle 22 and the lock buckle are buckled and matched. A connecting rod assembly is connected to the jump buckle 22. Generally, the connecting rod assembly includes an upper connecting rod and a lower connecting rod. One end of the upper connecting rod is connected with the jump buckle 22. A rocker arm spring is connected between the hinge joint of the upper connecting rod and the lower connecting rod and the rocker arm. The lower connecting rod is directly or indirectly connected with the rotating shaft 31 in the breaker pole. The lock buckle is in limit cooperation with the re-latch rotatably arranged between the pair of side plates.

[0099] In addition, a traction rod 23 spanning three breaker poles is arranged on one side of the operating mechanism 2. The traction rod 23 is used to drive the re-latch to release the limit cooperation between the re-latch and the lock buckle, and the lock buckle and the jump buckle 22 are released from the buckling cooperation, so as to realize the tripping of the operating mechanism 2. In this embodiment, three push rods 231 are sleeved on the traction rod 23. Each push rod 231 is provided with a tripping trigger part 2311, and each tripping trigger part 2311 corresponds to a breaker pole respectively.

[0100] Combined with Figure 3 、 49 - 33 provide a specific structure of a breaker pole. The structures of the three breaker poles are the same. Each breaker pole includes a pair of terminal connectors 7, a contact mechanism 3, an arc extinguishing system 4, a mutual inductor 5, and a short - circuit protection mechanism 6. Among them, a pair of terminal connectors 7 are respectively arranged in the terminal mounting slots 125 in each first wiring cavity 1161. Each terminal connector 7 corresponds to a wiring socket 112 respectively. The contact mechanism 3 includes a moving contact assembly and a static contact 34 that cooperate with each other. The moving contact assembly is linked to the operating mechanism 2 and is electrically connected to one of the terminal connectors 7. The static contact 34 is fixed in the inner shell 12 and is electrically connected to the other terminal connector 7. The arc extinguishing system 4 includes an arc extinguishing chamber 41 and an exhaust passage 42. The contact mechanism 3, the arc extinguishing chamber 41, and the exhaust passage 42 are arranged in the inner shell 12 along the first direction, which is beneficial to increasing the space of the arc extinguishing chamber 41 and improving the arc extinguishing effect. The mutual inductor 5, the contact mechanism 3, and the short - circuit protection mechanism 6 are arranged in sequence along the second direction, making the internal structure more compact and reasonably utilizing the internal space.

[0101] As Figure 30 - 33 shown, in this embodiment, the terminal connector 7 is a bridge - shaped terminal. Each terminal connector 7 includes a conductive bar 71 and at least two terminal components 72 arranged in parallel and spaced apart in the third direction. Among them, the conductive bar 71 is arranged in the first wiring cavity 1161 along the first direction. Both ends of each terminal component 72 form two elastic clamping ends. One end of the conductive bar 71 is provided with at least two clamping parts 711 arranged in parallel and spaced apart in the third direction. Each clamping part 711 is clamped by a clamping end of a terminal component 72, and the other clamping end away from the conductive bar 71 is used to connect with an external conductor.

[0102] In this way, both the clamping parts 711 of the conductive bar 71 and the terminal components 72 are in a structure arranged in parallel and spaced apart, which not only ensures the current - carrying capacity but also can reduce the temperature at the connection. In addition, the two clamping ends are respectively used for plugging and connecting with the conductive bar 71 and the external conductor. The plugging and unplugging of one clamping end have little influence on the other clamping end, which is beneficial to improving the wiring stability of the terminal connector 7 and thus ensuring the safe use of the circuit breaker.

[0103] Specifically, as Figure 31 、 32 shown, the terminal component 72 includes a support component. A pair of elastic pieces 723 spaced apart in the second direction are arranged on the support component. A clamping piece is arranged between the pair of elastic pieces 723. Both ends of the clamping piece form two elastic clamping ends. Each clamping end has a clamping gap for plugging the clamping part 711. One side of each clamping end facing away from the clamping gap is respectively connected to the adjacent elastic piece 723, thus forming an elastic clamping end.

[0104] Furthermore, the clamping member can be made of an elastic material and its structure can be a split structure. The clamping member includes two clamping pieces spaced apart in the second direction. The clamping pieces are preferably plate-shaped structures with a certain degree of bending. The middle parts of the two clamping pieces are respectively engaged with the support assembly to form a first fulcrum, and the gap between the two clamping pieces corresponding to the first fulcrum is the smallest. The same ends of the two clamping pieces and the gap between the same ends cooperate to form a clamping end. One of the clamping ends cooperates with the clamping portion 711 to form a second fulcrum. When the clamping portion 711 of the busbar 71 is inserted into the clamping end, the two clamping pieces rotate around the first fulcrum. When an external conductor is inserted into the other clamping end, the two clamping pieces rotate around the second fulcrum, so as to facilitate clamping the busbar 71 or the external conductive member by the clamping end. Of course, the clamping member can be an integral structure, that is, the clamping member is formed by connecting two U-shaped clips in the first direction. The opening of each U-shaped clip can be used as a clamping end, and the ends of the two U-shaped clips facing away from the openings are connected together so that the openings of the two U-shaped clips face away from each other. The integral clamping member is easier to assemble on the support assembly.

[0105] Preferably, a limiting structure is provided between the clamping end and the busbar 71. The limiting structure includes a limiting groove 7223 and a limiting protrusion 712 that limit each other. Among them, the limiting groove 7223 can be provided on the clamping member and / or the busbar 71, and the limiting protrusion 712 is provided on the busbar 71 and / or the clamping member. The contact surfaces of the limiting groove 7223 and the limiting protrusion 712 are arc-shaped surfaces, so that the limiting protrusion 712 can rotate in the limiting groove 7223. Thus, the limiting protrusion 712 and the limiting groove 7223 can cooperate to form the second fulcrum of the clamping end and the clamping portion 711. Of course, using an arc-shaped surface can also prevent mutual wear during the insertion process.

[0106] Specifically, as Figure 30 - 33 shown, each terminal 7 includes a busbar 71 and three terminal assemblies 72 with the same structure and arranged side by side and spaced apart in the third direction. One end of the busbar 71 is inserted into the three terminal assemblies 72 at the same time. That is, three clamping portions 711 arranged side by side and spaced apart are provided at one end of the busbar 71. Each clamping portion 711 is connected to the clamping end of a terminal assembly 72. The intervals between the clamping portions 711 and the intervals between the terminal assemblies 72 are beneficial to reducing the temperature at the connection. The ends of the three terminal assemblies 72 away from the busbar 71 jointly correspond to a wiring socket 112 on the housing 11.

[0107] As Figure 30 、 31As shown, the busbar 71 includes a plate-shaped body. The middle part of the plate-shaped body is bent at least once, so that the first end and the second end of the plate-shaped body are respectively located on two parallel planes. In the figure, the width of the first end of the plate-shaped body is greater than that of the second end of the plate-shaped body. That is, the width of the first end of the plate-shaped body is equal to the total width of the three terminal assemblies 72. The first end of the plate-shaped body is divided into three juxtaposed clamping parts 711. The three clamping parts 711 are separated from each other, which is conducive to reducing the overall temperature at one end of the busbar 71. At least one side plate surface in the middle of each clamping part 711 protrudes to form an arc-shaped limiting protrusion 712. At least one fixing hole 713 is provided at the second end of the plate-shaped body. By assembling fasteners 54 in the fixing hole 713, it is used to fixedly connect with the conductive parts inside the circuit breaker.

[0108] As Figure 30 - 32 shown, each terminal assembly 72 includes a support assembly, a clamping member, and a pair of elastic pieces 723. The pair of elastic pieces 723 are arranged on the support assembly and are spaced opposite to each other in the second direction. The clamping member is arranged between the pair of elastic pieces 723, and the middle part of the clamping member is rotatably connected to the support assembly. Two clamping ends are respectively formed at both ends of the clamping member, and a clamping gap is left at each clamping end. One of the clamping gaps is used for plugging with one clamping part 711 of the busbar 71, and the other clamping gap is used for connecting with the conductive parts outside the circuit breaker.

[0109] As Figure 32 shown, the support assembly includes two pairs of spaced support walls. A support frame 7211 with a quadrilateral hollow area in the middle is formed by sequentially connecting the two pairs of support walls end to end. The edges of one pair of support walls extend outwards to form extension walls. A support shaft 7212 is connected between the two extension arms. The pair of elastic pieces 723 pass through the hollow area. When the elastic pieces 723 are deformed, one side of each elastic piece 723 facing away from the support shaft 7212 abuts against a support wall. The support shaft 7212 is located between the pair of elastic pieces 723, and the support shaft 7212 is parallel to the plane where the elastic pieces 723 are located. The clamping member passes through the hollow area and cooperates with the support shaft 7212. The two clamping ends of the clamping member respectively extend outside both sides of the support frame 7211, and the end parts of each clamping end are respectively connected to the pair of elastic pieces 723, so that the elastic pieces 723 provide elastic force for the clamping ends.

[0110] As Figure 32 shown, the clamping member includes two clamping pieces spaced in the second direction. The middle parts of the two clamping pieces respectively cooperate with the support assembly to form a first fulcrum, and the gap between the two clamping pieces corresponding to the first fulcrum is the smallest, so that the same ends of the two clamping pieces and the gap between the same ends cooperate to form a clamping end. One of the clamping ends cooperates with the clamping part 711 to form a second fulcrum.

[0111] In this embodiment, each clamping piece is formed by a plurality of clamping grid pieces 7220 arranged side by side in the third direction. Figure 30 - 33 Among them, the plate surfaces of two adjacent clamping grid pieces 7220 are mutually attached. Each clamping grid piece 7220 includes two clamping segments and a straight segment 72203 connected between the two clamping segments. For convenience of description, the two clamping segments are respectively a first clamping segment 72201 and a second clamping segment 72202. The first clamping segment 72201, the straight segment 72203, and the second clamping segment 72202 are arranged along the first direction. A first groove is formed at the edge of the straight segment 72203. Figure 33 Among them, the first groove is closer to the second clamping segment 72202. A second groove a2 is formed at the edge of the connection between the straight segment 72203 and at least one clamping segment. Figure 33 Among them, the second groove a2 is located at the connection between the straight segment 72203 and the first clamping segment 72201.

[0112] When two clamping grid pieces 7220 are spaced relatively, the gap between the two straight segments 72203 is the smallest. Thus, the minimum gap between the middle parts of the two clamping pieces is correspondingly formed. The two first grooves are opposite to form an assembly groove 7224. The support shaft 7212 is arranged in the assembly groove 7224, so that the middle part of each clamping grid piece 7220 (clamping piece) can rotate around the support shaft 7212. That is, the middle part of each clamping piece cooperates with the support component to form a first fulcrum. The two spaced relatively clamping segments and the gap between the two clamping segments form a clamping end. That is, the two first clamping segments 72201 and the gap between the two first clamping segments 72201 form a first clamping end 7221. The first clamping end 7221 has a first clamping gap, and the first clamping gap is used for inserting into the clamping part 711 of the conductive row 71. The two second grooves a2 are opposite to form a limiting groove 7223. The limiting groove 7223 cooperates with the limiting protrusion 712 of the clamping part 711 to improve the connection stability. At the same time, the contact surface between the limiting groove 7223 and the limiting protrusion 712 is an arc surface, and the two can cooperate to form a second fulcrum between the clamping part 711 and the clamping end. The two second clamping segments 72202 and the gap between the two second clamping segments 72202 form a second clamping end 7222. The second clamping end 7222 has a second clamping gap, and the second clamping gap is used for inserting into an external conductive part.

[0113] In this embodiment, the ends of the first clamping segment 72201 and the second clamping segment 72202 are respectively deflected towards the direction close to the elastic piece 723. Thus, the opening degree of the first clamping end 7221 and the second clamping end 7222 can be increased, which is convenient for inserting the conductive row 71 and the external conductive part. At the same time, it is also beneficial to connect with the end of the elastic piece 723, leaving a deformation space between the elastic piece 723 and the clamping piece. It should be noted that each clamping piece can also be a plate structure.

[0114] Another structure of the clamping member (not shown) is provided. The clamping member includes two U-shaped clips. One end of each U-shaped clip is provided with an opening, and the other end is a connecting end 431. The two U-shaped clips are arranged in the first direction, so that the connecting ends 431 of the two U-shaped clips are connected together to form an integral structure. An assembly groove 7224 for assembling the support shaft 7212 is formed at the connection of the two connecting ends 431. The opening of each U-shaped clip serves as a clamping end. A mutually matching limiting structure may also be provided between one of the clamping ends and the conductive bar 71.

[0115] As Figure 30 - 32 shown, each elastic piece 723 is integrally in a plate-shaped structure. A plurality of spaced slits are formed at both ends of each elastic piece 723, so that both ends of each elastic piece 723 form a comb-like shape. The comb-like end is connected to the clamping end. A certain space is reserved between each elastic piece 723 and the clamping piece, so that the middle part of the elastic piece 723 can move towards the direction close to the clamping member to generate deformation.

[0116] Combined with Figure 3 、 4 and 9-16 provide a contact mechanism 3. The contact mechanism 3 includes a moving contact assembly and a static contact 34 that are spaced opposite to each other in the second direction. The moving contact assembly is rotatably arranged in the middle of the inner shell 12. The moving contact assembly includes a rotating shaft 31 and a moving contact 32. The rotating shaft 31 is rotatably assembled in the inner shell 12 and is linked with the operating mechanism 2, that is, the rotating shaft 31 is directly or indirectly linked with the lower connecting rod of the operating mechanism 2. A contact cavity 312 is provided in the middle of the rotating shaft 31. The moving contact 32 is rotatably arranged in the contact cavity 312. One end of the moving contact 32 extends out of the contact cavity 312 and is provided with a moving contact point 321. The static contact 34 is fixed in the inner shell 12 and is on the same side of the inner shell 12 as the short-circuit protection mechanism 6. The static contact 34 is provided with a static contact point 342 that is spaced opposite to the moving contact point 321. Driving the operating mechanism 2 drives the rotating shaft 31 to rotate, and the rotating shaft 31 drives the moving contact 32 to contact or separate from the static contact 34.

[0117] As Figure 9 - 12 shown, the moving contact assembly further includes a baffle 33 coaxially connected to the moving contact 32. The baffle 33 includes at least one connecting arm 331. The connecting arm 331 is fixedly attached to the side wall of the moving contact 32. A shielding portion 332 is provided in the middle of the connecting arm 331. The shielding portion 332 is located in the contact cavity 312 and spans and covers the middle region of the moving contact 32 facing away from the moving contact point 321. In this way, the baffle 33 is coaxially connected to the moving contact 32, so that the baffle 33 moves synchronously with the moving contact 32. At the same time, the connecting arm 331 is arranged to fit the side wall of the moving contact 32, and the shielding portion 332 is located in the contact cavity 312, avoiding mutual interference between the baffle 33 and the rotating shaft 31 and the outer shell 11, and ensuring that the moving contact 32 can be repelled to the maximum angle.

[0118] Furthermore, a positioning portion is protruding from the middle of one side of the moving contact 32 facing away from the moving contact 321, and a positioning groove for accommodating the positioning portion is formed in the middle of the shielding portion 332. The mutual cooperation between the positioning portion and the positioning cavity can ensure the connection stability between the baffle 33 and the moving contact 32.

[0119] Preferably, Figure 10 , 11 , 13 and 14, the moving contact 32 includes a plurality of moving contact pieces 320 arranged in parallel, and the baffle 33 includes a plurality of connecting arms 331 arranged in parallel. The shape of each connecting arm 331 is similar to the shape of each moving contact piece 320, and two adjacent moving contact pieces 320 are separated by a connecting arm 331. The moving contact pieces 320 and the connecting arms 331 are arranged at intervals, which improves the connection stability between the moving contact pieces 320 and the connecting arms 331, and makes the movements of the plurality of moving contact pieces 320 have better consistency. At the same time, the connection stability between the baffle 33 and the moving contact 32 is further ensured. Of course, the moving contact 32 can also be an integrated structure, in which case the baffle 33 includes a pair of connecting arms 331 arranged at intervals, and the moving contact 32 is arranged between the pair of connecting arms 331. Of course, it is also possible to set only one connecting arm 331.

[0120] like Figure 9 - 14 As shown in Figures 34-36, the moving contact assembly includes a rotating shaft 31, a moving contact 32 and a baffle 33. A contact cavity 312 is provided in the middle of the rotating shaft 31. An opening is provided at one end of the contact cavity 312. A toggle portion 311 is provided protruding from the rotating shaft 31 opposite to the opening. The toggle portion 311 extends into the accessory slot 124 from a through hole provided at the bottom of the accessory slot 124 and can swing in the accessory slot 124. Figure 34 - 36 In the embodiment, the two opposite sides of the toggle portion 311 are inclined surfaces, and the two inclined surfaces make the toggle portion 311 as a whole an inverted V-shaped boss; the rotating shaft 31 facing away from the opening is also provided with a groove as a matching portion, and the matching portion can correspond to the inside of the accessory slot 124. Compared with the toggle portion 311, the matching portion is closer to the operating mechanism 2; the middle part of the moving contact 32 is rotatably connected to the contact cavity 312, one end of the moving contact 32 extends out of the rotating shaft 31 from the opening of the contact cavity 312 and is provided with a moving contact point 321, and the other end of the moving contact 32 is located in the contact cavity 312 and can move in the rotation space reserved in the contact cavity 312. The moving contact 32 is coaxially connected to the baffle 33, that is, the baffle 33 and the moving contact 32 have the same rotation center, the baffle 33 includes at least one connecting arm 331, the connecting arm 331 is fitted and fixed on the side wall of the moving contact 32, the shape of the connecting arm 331 matches the shape of the side wall of the moving contact 32, and a shielding portion 332 is provided in the middle of the connecting arm 331, the shielding portion 332 is located in the energy storage cavity and spans across and covers the middle area of the moving contact 32 facing away from the moving contact 321, that is, the shielding portion 332 surrounds a partial area of the moving contact 32 to form a semi-enclosed structure.

[0121] In this embodiment, the moving contact 32 includes a plurality of moving contact pieces 320 arranged side by side in the third direction. One moving contact point 321 is provided on the side of one end of each moving contact piece 320. A positioning protrusion 322 protrudes outward from the middle side of the moving contact piece 320 facing away from the moving contact point 321. Figure 13 、 14 In [description], the positioning protrusion 322 is approximately trapezoidal. A clamping groove 323 is formed at the connection between the positioning protrusion 322 and the middle side wall of the moving contact piece 320. The clamping groove 323 is closer to the end provided with the moving contact point 321. The edge of the shielding portion 332 can be clamped with the clamping groove 323. When a plurality of moving contact pieces 320 are arranged side by side, all the positioning protrusions 322 form a positioning portion; an arc-shaped protrusion 325 protrudes outward from the middle side of the moving contact piece 320 facing away from the positioning protrusion 322. The arc-shaped protrusion 325 and the moving contact point 321 are on the same side of the moving contact piece 320. The arc-shaped protrusion 325 is located in the contact head cavity 312; at least one connecting portion is provided in the middle of each moving contact piece 320. Figure 13 、 14 In [description], a first connecting portion 326 and a second connecting portion 327 are provided in the middle of the moving contact piece 320. The first connecting portion 326 and the second connecting portion 327 are arranged at intervals. Among them, the first connecting portion 326 is closer to the end away from the moving contact point 321. The first connecting portion 326 is a round hole. The first connecting portion 326 is used for coaxial assembly with the baffle 33 and the rotating shaft 31. Specifically, the first connecting portion 326 is connected to the shielding portion 332 in the baffle 33; the second connecting portion 327 is located between the end provided with the moving contact point 321 and the positioning protrusion 322. The second connecting portion 327 is a circular convex shaft, and the diameter of the second connecting portion 327 is smaller than the diameter of the first connecting portion 326. The second connecting portion 327 is used for connecting with the connecting arm 331 in the baffle 33.

[0122] Further, a guiding portion 324 is provided at one end of one or two moving contact pieces 320 located in the middle position. The guiding portion 324 is located on the side wall of the moving contact piece 320 facing away from the moving contact point 321. In this embodiment, for the convenience of description, the moving contact piece 320 is divided into a first moving contact piece 3201 (see Figure 10 、 11 and 13) and a second moving contact piece 3202 (see Figure 10 、 11 and 14), and the first moving contact piece 3201 and the second moving contact piece 3202 have similar structures. The moving contact 32 includes four first moving contact pieces 3201 and one second moving contact piece 3202. Among them, the second moving contact piece 3202 is located in the middle of the four first moving contact pieces 3201. The guiding portion 324 is provided on the second moving contact piece 3202. Of course, two second moving contact pieces 3202 can also be located in the middle of the four first moving contact pieces 3201.

[0123] The specific structure of the baffle 33 is as follows Figure 10 - 12 As shown, the baffle 33 includes at least three connecting arms 331 arranged at intervals and a shielding portion 332. In this embodiment, there are four connecting arms 331. The shape of each connecting arm 331 matches the shape of the moving contact piece 320. There is a contact piece gap between adjacent two connecting arms 331, and a moving contact piece 320 is arranged in each contact piece gap. A first connecting hole 3301 and a second connecting hole 3302 are arranged in the middle of each connecting arm 331, and the first connecting hole 3301 and the second connecting hole 3302 are respectively correspondingly connected to the first connecting portion 326 and the second connecting portion 327 of the moving contact piece 320; the shielding portion 332 includes a hollow fan-shaped cavity. The narrower end of the fan-shaped cavity is correspondingly connected to the connecting arm 331 provided with the first connecting hole 3301. The wider end of the fan-shaped cavity is provided with an arc-shaped convex surface 3321. Preferably, the radian of the arc-shaped convex surface 3321 is the same as the radian of the contact head cavity 312. One side edge of the arc-shaped convex surface 3321 straddles all the connecting arms 331. The edge of the arc-shaped convex surface 3321 is preferably clamped with the card slot 323 on the moving contact piece 320. The opening of the fan-shaped cavity is located on the side facing the moving contact 32, so that after the plurality of positioning protrusions 322 form a positioning portion, they extend into the fan-shaped cavity from the opening of the fan-shaped cavity.

[0124] The static contact 34 can adopt the existing technology. The static contact 34 includes a static contact plate 341 arranged along the first direction. One end of the static contact plate 341 is provided with a static contact point 342. The static contact point 342 is spaced opposite to the moving contact point 321 in the second direction. The number of the static contact points 342 can match the number of the moving contact points 321, or only one static contact point 342 with a larger size is provided, and the plurality of moving contact points 321 cooperate with the same static contact point 342.

[0125] Combined with Figure 4 、 15 -19 provides the specific structure of an arc extinguishing system 4

[0126] As Figure 4 、 15 and 16 show, the arc extinguishing system 4 includes an arc extinguishing chamber 41, an exhaust passage 42, an exhaust port 123 and a pressure regulating member 43. A plurality of arc extinguishing grid pieces are arranged at intervals between the incoming arc end and the exhaust end of the arc extinguishing chamber 41 Figure 4 、 15 In, the plurality of arc extinguishing grid pieces are arranged at intervals in the second direction. The incoming arc end of the arc extinguishing chamber 41 is connected to the contact mechanism 3. The exhaust passage 42 is connected between the exhaust end of the arc extinguishing chamber 41 and the exhaust port 123. That is, the two ends of the exhaust passage 42 are respectively correspondingly communicated with the exhaust end and the exhaust port 123. The tail gas generated after the arc extinguishing chamber 41 extinguishes the arc is discharged from the exhaust port 123 through the buffering of the exhaust passage 42.

[0127] The pressure regulating member 43 is rotatably arranged in the exhaust passage 42, and the pressure regulating member 43 is driven by the air pressure difference between the exhaust passage 42 and the exhaust end to keep the exhaust passage 42 and the exhaust end in a communicating or blocking state. That is, the exhaust gas discharged from the exhaust end of the arc extinguishing chamber 41, the air pressure at the exhaust end is greater than the air pressure in the exhaust passage 42, and an air pressure difference is generated between the exhaust end and the exhaust passage 42, driving the pressure regulating member 43 to rotate, so that the exhaust passage 42 and the exhaust end are kept in a communicating state, so that the exhaust gas can enter the exhaust passage 42. When a large amount of exhaust gas in the exhaust passage 42 is discharged, the air pressure in the exhaust passage 42 decreases, and the air pressure difference from the exhaust end decreases. The pressure regulating member 43 rotates to its original position to block the communication between the exhaust passage 42 and the exhaust end.

[0128] In this way, by arranging the pressure regulating member 43 in the exhaust passage 42, when the exhaust end discharges exhaust gas, the air pressure difference drives the pressure regulating member 43 to rotate and open, so that the exhaust gas enters the exhaust passage 42 in a state where the exhaust passage 42 and the exhaust end are kept in communication. When the exhaust gas is discharged from the exhaust port 123, the air pressure difference decreases, causing the pressure regulating member 43 to reset to block the communication between the exhaust passage 42 and the exhaust end, preventing the high-temperature gas from backspraying from the exhaust passage 42 into the arc extinguishing chamber 41 or the inside of the circuit breaker, improving the product performance and extending the service life.

[0129] Preferably, one end of the exhaust passage 42 is provided with an inlet 421, and the inlet 421 is correspondingly communicated with the side position of the exhaust end. Figure 15 Among them, the inlet 421 is located on the side away from the static contact 34. The connecting end 431 of the pressure regulating member 43 is rotatably connected to one side of the inlet 421. The movable end 432 of the pressure regulating member 43 cooperates with one side wall of the exhaust passage 42 to open or cover the inlet 421. The exhaust gas discharged from the arc extinguishing chamber 41 is communicated with the inlet 421 through the side position of the exhaust end. The exhaust gas is first collected on one side and then enters the inlet 421, which is beneficial to driving the pressure regulating member 43 to rotate and improving its cooperation performance.

[0130] Further, the distance between the movable end 432 and the connecting end 431 of the pressure regulating member 43 is greater than the inner diameter of the inlet 421. That is, the length of the pressure regulating member 43 is greater than the inner diameter of the inlet 421. In this way, the movable end 432 extends to the middle of the exhaust passage 42, and the movable end 432 moves inside the exhaust passage 42. The pressure regulating member 43 does not need to additionally occupy the space inside the inner shell 12. At the same time, by using a pressure regulating member 43 with a larger length, its blocking effect can be ensured.

[0131] Such as Figure 15 、 16As shown, the arc extinguishing chamber 41 can adopt the prior art. One end of the arc extinguishing chamber 41 is the arc inlet end and is provided with an arc inlet. The arc inlet end of the arc extinguishing chamber 41 is matched with the contact mechanism 3. The arc inlet end of the arc extinguishing chamber 41 is provided with an arc guiding plate matched with the contact mechanism 3. The other end of the arc extinguishing chamber 41 is the exhaust end and is connected to the exhaust passage 42. A plurality of arc extinguishing grids arranged at intervals are arranged between the arc inlet end and the exhaust end of the arc extinguishing chamber 41. An arc extinguishing gap is formed between two adjacent arc extinguishing grids. Each arc extinguishing gap is approximately arranged along the first direction. Both ends of each arc extinguishing gap communicate with the arc inlet end and the exhaust end. Figure 15 , 16 In, some of the arc extinguishing grids at the position close to the side in the arc extinguishing chamber 41 are shorter in length, that is, the arc extinguishing grids on the side away from the static contact 34 are shorter in length. The exhaust end corresponds to the area where the arc extinguishing grids are shorter and is connected to the exhaust passage 42.

[0132] As Figure 15 shown, both ends of the exhaust passage 42 are respectively connected to the exhaust end of the arc extinguishing chamber 41 and the exhaust port 123 on the circuit breaker housing 11. One end of the exhaust passage 42 is provided with an inlet 421. The inlet 421 of the exhaust passage 42 is connected to the side position of the exhaust end, that is, the inlet 421 communicates with the exhaust end position of the corresponding shorter arc extinguishing grid. The other end of the exhaust passage 42 serves as an outlet and corresponds to the exhaust port 123 for connection. Figure 15 In, the exhaust passage 42 is integrally in the shape of a horn (or duckbill) with one end thick and one end thin. The end with a smaller inner diameter of the exhaust passage 42 is provided with an outlet and corresponds to the exhaust port 123 for connection. The end with a larger inner diameter of the exhaust passage 42 is provided with an inlet 421. Figure 15 In, the inlet 421 is located at the side position of the exhaust passage 42. The inner diameter of the inlet 421 is much smaller than the inner diameter of the thicker end of the exhaust passage 42, so that the tail gas entering the exhaust passage 42 buffers in the area with a larger inner diameter. One side wall of the inlet 421 serves as a partition 127 and extends along the outside of the exhaust end.

[0133] The pressure regulating member 43 is rotatably arranged at the position of the inlet 421 of the exhaust passage 42. One end of the pressure regulating member 43 serves as a rotating end and is rotatably connected to one side of the inlet 421. The other end of the pressure regulating member 43 serves as a movable end 432 and is matched with one side wall of the exhaust passage 42. The length of the connection line between the movable end 432 and the connection end 431 of the pressure regulating member 43 is greater than the inner diameter of the inlet 421. Figure 15In it, the movable end 432 of the pressure regulating member 43 extends to the middle of the exhaust passage 42. When the pressure regulating member 43 is used to cover the inlet 421, the movable end 432 of the pressure regulating member 43 abuts against the inner side wall of the exhaust passage 42. At this time, the line connecting the movable end 432 and the connecting end 431 forms an angle with the end face of the exhaust end, and the range of this angle is 50 to 80°. In this embodiment, the distance between the movable end 432 and the connecting end 431 of the pressure regulating member 43 is greater than the inner diameter of the inlet 421, so that the movable end 432 can extend to the middle of the exhaust passage 42, and the internal space of the exhaust passage 42 provides a space for the movable end 432 to move. Figure 15 In it, the connecting end 431 of the pressure regulating member 43 is rotatably connected to the end region of the partition portion 127, or rotatably connected to the end region near the partition portion 127, and the movable end 432 can abut against the side wall of the exhaust passage 42.

[0134] Furthermore, the pressure regulating member 43 is further provided with a limiting member 434. The limiting member 434 is used to limit the rotation amplitude of the movable end 432 by cooperating with the side wall of the exhaust passage 42. Among them, the limiting member 434 can have an elastic elastic piece 723 or can be a section of spring. Preferably, the limiting member 434 is located between the pressure regulating member 43 and the partition portion 127, and the limiting member 434 cooperates with the partition portion 127 to limit the rotation amplitude of the movable end 432. Furthermore, at least one end of the limiting member 434 is located on the body side facing away from the abutting portion 433, so that the limiting member 434 limits the swing range of the pressure regulating member 43 from the direction facing away from the abutting portion 433.

[0135] Combined with Figure 15 - 17 Provide the first structure of the pressure regulating member 43. The pressure regulating member 43 includes a straight plate-shaped body. One end of the body is provided with a round shaft portion as the connecting end 431. The connecting end 431 can be rotatably matched with the shaft hole opened on one side of the inlet 421. The other end of the body is used as the movable end 432. Abutting portion 433 is convexly provided on the surface of the movable end 432. A limiting member 434 is connected to the body side facing away from the abutting portion 433. Preferably, the limiting member 434 is integrally formed by the body. One end of the limiting member 434 is connected to the body near the connecting end 431, and the other end of the limiting member 434 extends obliquely along the direction deviating from the body. The included angle between the limiting member 434 and the body ranges from 25 to 40°. Of course, the limiting member 434 can also adopt other structures.

[0136] When the pressure regulating member 43 covers the inlet 421 to block the communication between the exhaust passage 42 and the exhaust end, the abutting portion 433 abuts against the inner side wall of the exhaust passage 42. When the exhaust gas discharged from the exhaust end drives the pressure regulating member 43 to rotate, the abutting portion 433 separates from the side wall of the exhaust passage 42 until the limiting member 434 abuts against the side wall of the exhaust passage 42 (the side of the partition portion 127 facing away from the exhaust end), thereby limiting the rotation angle of the pressure regulating member 43. When the exhaust gas in the exhaust passage 42 is discharged from the exhaust port 123 and a large amount of gas is discharged, the air pressure in the exhaust passage 42 decreases, thereby driving the pressure regulating member 43 to rotate back until the abutting portion 433 abuts against the inner side wall of the exhaust passage 42 again, thereby covering the inlet 421 of the exhaust passage 42.

[0137] Combined with Figure 18 、 19 A second structure of the pressure regulating member 43 is provided. The pressure regulating member 43 includes a straight plate-shaped body. One end of the body is provided with a circular shaft portion as the connecting end 431. The connecting end 431 can be rotationally matched with the shaft hole opened on one side of the inlet 421. The other end of the body is the movable end 432. The two side edges of the movable end 432 are bent and extended toward the same side to form a protruding abutting portion 433. A hollow area 435 is provided in the middle of the body. One end of the limiting member 434 is connected to the edge of the hollow area 435, and the other end of the limiting member 434 passes through the hollow area 435 and is located on the side of the body facing away from the abutting portion 433.

[0138] Figure 18 、 19 In, the limiting member 434 is a strip-shaped plate structure. The middle of the limiting member 434 is bent to form a U-shaped portion. The U-shaped portion makes the whole form an elastic structure and can generate an elastic restoring force for driving the pressure regulating member 43 to reset. The lengths of the two ends of the U-shaped portion are different. The U-shaped portion passes through the hollow area 435 and is on the same side of the body as the abutting portion 433, and the hollow area 435 reserves space for the deformation of the U-shaped portion. One end (the shorter end) of the U-shaped portion is connected to the edge of the hollow area 435 far from the abutting portion 433. Preferably, the limiting member 434 and the body are an integral structure. The other end (the longer end) of the U-shaped portion extends away from the body on the side of the body facing away from the abutting portion 433, and the end of the other end of the U-shaped portion is bent to facilitate abutting and cooperating with the partition portion 127.

[0139] When the pressure regulating member 43 covers the inlet 421 to block the communication between the exhaust passage 42 and the exhaust end, the other end of the U-shaped portion remains in contact with the partition portion 127. At this time, the overall structure of the pressure regulating member 43 is shown in Figure 19The dashed-line part; when the exhaust gas discharged from the exhaust end drives the pressure regulating member 43 to rotate, the abutting portion 433 is separated from the side wall of the exhaust passage 42. During this process, the U-shaped portion of the limiting member 434 deforms correspondingly in the hollow area 435, and the deformation of the limiting member 434 can provide a restoring force for the rotation of the pressure regulating member 43; for the overall structure of the pressure regulating member 43, see Figure 19 The solid-line part; when the exhaust gas in the exhaust passage 42 is discharged from the exhaust port 123, after a large amount of gas is discharged, the air pressure in the exhaust passage 42 decreases, thereby driving the pressure regulating member 43 to rotate until the abutting portion 433 abuts against the inner side wall of the exhaust passage 42 again, thereby covering the inlet 421 of the exhaust passage 42, and the pressure regulating member 43 returns to Figure 19 the dashed-line state.

[0140] As Figure 15 、 16 shown, a plurality of arc extinguishing members 44 arranged at intervals in the first direction are clamped inside one end of the exhaust passage 42 away from the arc extinguishing chamber 41, so as to form a zero flashover chamber in the exhaust passage 42 near the exhaust port 123, thereby ensuring the use safety. A plurality of communication holes are provided on each arc extinguishing member 44, and the plurality of communication holes are preferably arranged in an array. The communication holes of two adjacent arc extinguishing members 44 are staggered. In this embodiment, the arc extinguishing member 44 closer to the exhaust port 123 has a smaller size to match the change of the inner diameter of the exhaust passage 42. Figure 15 、 16 In, 5 arc extinguishing members 44 arranged at intervals are provided in the area of the exhaust passage 42 close to the exhaust port 123. A clamping groove is provided on the side wall of the exhaust passage 42, and the edge of each arc extinguishing member 44 is clamped in the clamping groove. The arc extinguishing member 44 closest to the exhaust port 123 has the smallest size, the two middle arc extinguishing members 44 have the same size, and the other two arc extinguishing members 44 away from the exhaust port 123 have the largest size.

[0141] Preferably, an installation area corresponding to the installation of the arc extinguishing system 4 is provided inside the inner shell 12. The installation area is located on the side of the contact mechanism 3 away from the operating mechanism 2. One end of the installation area is communicated with the exhaust port 123. A partition portion 127 is provided in the middle of the installation area. The partition portion 127 divides the installation area into an arc extinguishing chamber 410 and an exhaust passage 42. The partition portion 127 can be formed by the inner side wall of the first cover body 121 and / or the second cover body 122 protruding.

[0142] Combined with Figure 4 、 28 and 29 provide an installation structure of an instrument transformer 5. The instrument transformer 5 is arranged in the inner shell 12. Figure 4In it, the mutual inductor 5 and the contact mechanism 3 are arranged side by side in the second direction, and the mutual inductor 5 is closer to the moving contact 32. A first conductive plate 52 is connected between the mutual inductor 5 and the adjacent terminal 7. Among them, the mutual inductor 5 is fixedly attached to the plate surface of the first conductive plate 52. The axis of the central hole of the mutual inductor 5 is parallel to the second direction, that is, the axis of the central hole of the mutual inductor 5 is perpendicular to the first conductive plate 52 arranged along the first direction. The first conductive plate 52 is located in the first wiring cavity 1161. A wiring row 53 is arranged in the central hole of the mutual inductor 5, and the first conductive plate 52 and the moving contact 32 are connected together by the wiring row 53.

[0143] In this way, the first conductive plate 52 does not pass through the central hole of the mutual inductor 5, and the first conductive plate 52 and the mutual inductor 5 are arranged in parallel. Compared with the perpendicular arrangement of the first conductive plate 52 and the mutual inductor 5, it has the advantage of small occupied space. It is connected to the contact mechanism 3 through the wiring row 53, which simplifies the wiring operation.

[0144] Further, as Figure 28 、 29 shown, the wiring row 53 includes a connecting body 531. The outer diameter of the connecting body 531 is less than or equal to the aperture of the central hole of the mutual inductor 5, so that the connecting body 531 can be arranged in the central hole of the mutual inductor 5. One end of the connecting body 531 is attached and connected to the plate body of the first conductive plate 52. The other end of the connecting body 531 is provided with a wiring pin 532. The total length of the wiring pin 532 and the connecting body 531 in the second direction is greater than the thickness of the mutual inductor 5 (the length of the mutual inductor 5 in the second direction), at least making the wiring pin 532 located outside the central hole of the mutual inductor 5, which is convenient for the wiring pin 532 to be inserted into the contact mechanism 3, that is, the mutual inductor 5 is connected to the moving contact 32 or the static contact 34 through the wiring pin 532, so as to connect the mutual inductor 5 into the main circuit of each breaker pole and simplify the wiring process.

[0145] Preferably, the outer diameter of the connecting body 531 is equal to the aperture of the central hole of the mutual inductor 5, and the length of the connecting body 531 is equal to the length of the central hole of the mutual inductor 5. At this time, the connecting body 531 is stuffed in the central hole of the mutual inductor 5, and the end faces at both ends of the connecting body 531 are flush with the end faces at both ends of the mutual inductor 5 respectively. The wiring pin 532 protrudes from the end face of the connecting body 531 far from the conductive plate. In addition, at least part of the central hole of the mutual inductor 5 is covered by the conductive plate, so as to facilitate the fitting connection between the connecting body 531 and the first conductive plate 52.

[0146] Further, the mutual inductor 5 is provided with a wiring part 51, and the wiring part 51 extends along the direction away from the mutual inductor 5 from the side of the first conductive plate 52, which is convenient for the wiring part 51 to be connected to the circuit board of the control module.

[0147] Specifically, as Figure 28 、 29As shown, the terminal block 53 includes a circular shaft-shaped connecting body 531. The outer diameter of the connecting body 531 is equal to the aperture diameter of the central hole of the mutual inductor 5, and the length of the connecting body 531 is equal to the axial length of the central hole of the mutual inductor 5. When the connecting body 531 is arranged in the central hole of the mutual inductor 5, the connecting body 531 can be stuffed therein, so that the end faces of both ends of the connecting body 531 are flush with the end faces of both ends of the mutual inductor 5 respectively. One end of the connecting body 531 is attached to the plate surface of the first conductive plate 52, and the connecting body 531 and the first conductive plate 52 are fixedly connected by at least one fastener 54. The other end of the connecting body 531 is provided with a wiring pin 532, and the wiring pin 532 is located outside the central hole of the mutual inductor 5. The wiring pin 532 is used to connect with the contact mechanism 3.

[0148] A wiring part 51 is arranged on one side of the mutual inductor 5. The wiring part 51 extends along the direction away from the mutual inductor 5 from the edge side position of the end of the first conductive plate 52. That is, the wiring part 51 and the wiring pin 532 extend along two opposite directions of the mutual inductor 5 respectively. The wiring part 51 is used to connect with the circuit board in the control module. Figure 28 、 29 In [description], the end face of the wiring part 51 is parallel to the plate surface of the first conductive plate 52 facing away from the mutual inductor 5. Preferably, the end face of the wiring part 51 slightly protrudes from the plate surface of the first conductive plate 52 facing away from the mutual inductor 5.

[0149] The first conductive plate 52 is parallel to the static contact plate 341 of the static contact 34. The moving contact 32 and the mutual inductor 5 are located between the static contact plate 341 and the first conductive plate 52. And the first conductive plate 52 is located in the first wiring cavity 1161 outside the inner shell 12 and is connected to the wiring terminal 7 located in the same first wiring cavity 1161. That is, one end of the first conductive plate 52 is connected to the terminal block 53. The first conductive plate 52 connected to the wiring terminal 7 can be arranged along the first wiring cavity 1161. Preferably, a cover plate 14 is covered on one side of the first conductive plate 52 facing the first side wall 1103. The heat dissipation holes 115 on the cover plate 14 are misaligned with the heat dissipation holes 115 on the first side wall 1103, which not only ensures heat dissipation but also prevents external impurities from directly falling on the first conductive plate 52.

[0150] Combined with Figure 20 - 27Provide a specific structure of the short - circuit protection mechanism 6. The short - circuit protection mechanism 6 is an electromagnetic release, which triggers the tripping of the operating mechanism 2 in case of a short - circuit fault. The short - circuit protection mechanism 6 includes a second conductive plate 61, a yoke 62, an armature 63, and a first bracket 64. The second conductive plate 61 passes through the gap between the yoke 62 and the armature 63. The two ends of the yoke 62 are bent along the two side edges of the second conductive plate 61 respectively and extend towards the direction close to the armature 63, so that the yoke 62 and the armature 63 cooperate to surround the outside of the second conductive plate 61, and a magnetic gap is formed by the cooperation of the yoke 62 and the armature 63 on one side of the second conductive plate 61. A pull rod 65 is connected to the armature 63, and the pull rod 65 and / or the armature 63 are in linear sliding fit with the bracket. When a relatively large current passes through the second conductive plate 61, the armature 63 is driven to move towards the direction close to the yoke 62. That is, the armature 63 moves linearly relative to the second conductive plate 61 in the first direction, and the sliding fit of the pull rod 65 and / or the armature 63 with the first bracket 64 restricts the movement track of the armature 63.

[0151] In this way, the armature 63 moves linearly relative to the first bracket 64 and the second conductive plate 61, and the sliding fit of the pull rod 65 and / or the armature 63 with the first bracket 64 restricts the movement track of the armature 63. Its overall structure is smaller than that of the solenoid - type electromagnetic release, and the space required for the linear movement track is smaller, which is beneficial to meeting the miniaturization design requirements of the circuit breaker.

[0152] Preferably, the first bracket 64 is spaced opposite to the second conductive plate 61, and a moving space is formed between the first bracket 64 and the second conductive plate 61, so that the armature 63 and the pull rod 65 move linearly in the moving space. The relatively closed moving space formed by the first bracket 64 and the second conductive plate 61 can prevent the armature 63 and the pull rod 65 from being interfered externally during the movement.

[0153] Furthermore, as Figure 21 shown, the first bracket 64 can be a plate - shaped structure. The first bracket 64 is parallel and opposite to the second conductive plate 61 to form a moving space. The first bracket 64 can also be a frame - shaped structure. The frame - shaped first bracket 64 at least surrounds the outside of the armature 63 and / or the pull rod 65 for sliding fit with the armature 63 or the pull rod 65. In addition, when the first bracket 64 is a plate - shaped structure, the first bracket 64 can also be arranged at the side position of the second conductive plate 61, so that the side surface of the armature 63 or the pull rod 65 slides with the first bracket 64.

[0154] A sliding structure that cooperates with each other is provided between the first bracket 64 and the pull rod 65. The sliding structure includes a sliding part and a sliding groove 651 that are slidably matched. Among them, the sliding groove 651 is preferably a strip-shaped groove. The sliding part protrudes from the first bracket 64 or the pull rod 65. Correspondingly, the sliding groove 651 is opened on the pull rod 65 or the first bracket 64. Of course, the sliding part can be a part provided on the first bracket 64 or the pull rod 65. For example, a fastening screw provided on the first bracket 64 or the pull rod 65. The part of the fastening screw protruding from the first bracket 64 can be used as the sliding part.

[0155] Preferably, as Figure 21 , 25 As shown in FIGS. 26 and 27, both the yoke 62 and the armature 63 are U-shaped frame structures, and the openings of the yoke 62 and the armature 63 are spaced opposite to each other and cooperate to form a magnetic gap. Among them, the central axis of the armature 63 is parallel to the plate surface of the second conductive plate 61, and the central axis of the yoke 62 is perpendicular to the plate surface of the second conductive plate 61. The yoke 62 and the armature 63 adopt a U-shaped frame structure, which is convenient for the two to cooperate and surround the outside of the second conductive plate 61, and it has the advantages of simple structure, low cost and small occupied space.

[0156] In addition, the electromagnetic release further includes at least one reset member. The reset member is preferably a spring. The reset member is connected to the armature 63 and / or the pull rod 65. Preferably, the reset member includes a first reset member 661 and a second reset member 662. Among them, the first reset member 661 is connected to the armature 63, and the second reset member 662 is connected to the pull rod 65, which is convenient for resetting the armature 63 and the pull rod 65; among them, the first reset member 661 is a spring. One end of the first reset member 661 is connected to the end of the armature 63 facing away from the pull rod 65, and the other end of the first reset member 661 is used to connect to the inside of the circuit breaker for driving the armature 63 to reset; the second reset member 662 is also a spring, Figure 20 In, two second reset members 662 are provided on the pull rod 65. One end of the second reset member 662 abuts against the pull rod 65, and the other end is used to connect to the inside of the circuit breaker for driving the pull rod 65 to reset. The number of the first reset member 661 and the second reset member 662 is set according to actual needs. Of course, only the first reset member 661 or only the second reset member 662 can also be provided.

[0157] Preferably, an installation groove is formed in the side wall of the inner shell 12. The yoke 62 and the armature 63 are relatively embedded in the installation groove at intervals in the first direction, and the armature 63 moves in the installation groove along the first direction. The first bracket 64 and the pull rod 65 are located between the inner shell 12 and the outer shell 11. It can be understood that a pair of first wiring cavities 1161 are provided on the opposite sides of the outer shell 11 and the inner shell 12. A first conductive plate 52 is provided in one of the first wiring cavities 1161, and the first bracket 64 and the pull rod 65 are provided in the other wiring cavity. The second conductive plate 61 and the first bracket 64 are both in a straight plate structure. The first bracket 64 and the second conductive plate 61 are relatively spaced in the second direction, and a moving space is formed between the first bracket 64 and the second conductive plate 61. The moving space is located outside the inner shell 12. The armature 63 is arranged in the moving space, and the pull rod 65 connected to the armature 63 moves in the moving space.

[0158] In this embodiment, one end of the second conductive plate 61 located in the inner shell 12 is folded back on the side facing away from the armature 63 to form a static contact plate 341. At this time, the static contact plate 341 and a part of the second conductive plate 61 cooperate to form a U-shaped structure. The static contact plate 341 and the second conductive plate 61 are both arranged along the first direction, and a gap for accommodating the yoke 62 is formed between the middle parts of the static contact plate 341 and the second conductive plate 61. A static contact point 342 is provided on the side of the static contact plate 341 facing away from the second conductive plate 61. The static contact point 342 and the moving contact point 321 are relatively spaced in the second direction. That is, after the static contact point 342 is provided on the static contact plate 341, a static contact 34 of the circuit breaker pole can be formed. Of course, one end of the second conductive plate 61 can also only provide a connecting part for connecting with the static contact 34 arranged inside the circuit breaker pole. The other end of the second conductive plate 61 extends out of the inner shell 12 and is correspondingly electrically connected to a wiring terminal 7.

[0159] As Figure 20 、 21 As shown in FIGS. 24 and 25, the yoke 62 includes a plate-shaped yoke body. Both ends of the yoke body are bent in the same direction to form a pair of relatively spaced first attracting walls 621. The area connected between the two first attracting walls 621 is the first connecting wall, so that the yoke 62 is an overall U-shaped frame structure. The ends of the two first attracting walls 621 away from the first connecting wall are the openings of the yoke 62. The plate surface where each first attracting wall 621 is located is perpendicular to the middle plate surface of the second conductive plate 61, and the first attracting wall 621 is higher than the plate surface of the second conductive plate 61. At least one side edge of each first attracting wall 621 is used as the first attracting surface 6211. In this embodiment, the end surface of the first attracting wall 621 protrudes from the second conductive plate 61, and the end surface of the first attracting wall 621 is used as the first attracting surface 6211. That is, the first attracting surface 6211 is located on the side edge of the first attracting wall 621 away from the second conductive plate 61. The first attracting surface 6211 is preferably an inclined surface. In addition, the yoke 62 can be formed by laminating multiple yoke bodies.

[0160] As shown Figure 20 , 21 in FIGS. 26, the armature 63 includes a straight plate-shaped armature body. Both ends of the armature body are bent in the same direction to form a pair of second attracting walls 631 that are spaced apart and opposite to each other. The area connecting between the two second attracting walls 631 is the second connecting wall, making the armature 63 as a whole in a U-shaped frame structure. The ends of the two second attracting walls 631 away from the second connecting wall are the openings of the armature 63. The plane where each second attracting wall 631 and the second connecting wall are located is perpendicular to the plane where the second conductive plate 61 is located. One side edge of the second attracting wall 631 serves as the second attracting surface 6311 for cooperating with the first attracting surface 6211. In this embodiment, the edge of the second attracting wall 631 close to the second conductive plate 61 serves as the second attracting surface 6311. The second attracting surface 6311 is also an inclined surface, and the inclination degrees of the first attracting surface 6211 and the second attracting surface 6311 are the same. A magnetic gap is formed between the first attracting surface 6211 and the second attracting surface 6311. The first attracting surface 6211 and the second attracting surface 6311 adopt inclined surfaces with the same inclination degree, so that the armature 63 and the magnetic yoke 62 have a long mating surface, which is beneficial to ensuring the attracting stability of the two. In addition, the armature 63 can also be formed by stacking multiple armature bodies.

[0161] It should be noted that the central axis of the magnetic yoke 62 in this embodiment refers to the axis of symmetry of the two first attracting walls 621, and the central axis of the armature 63 refers to the axis of symmetry of the two second attracting walls 631.

[0162] Combined with Figure 21 , 23 FIGS. 24 provides a specific structure of a pull rod 65. The pull rod 65 includes a pull rod body 650. The pull rod body 650 is a plate-shaped structure with unequal widths at both ends, and the width of the pull rod body 650 gradually decreases. Figure 23 , 24 In FIGS., the width of the pull rod body 650 gradually decreases in a stepped manner. The end of the pull rod body 650 with a larger width is fixedly connected to the armature 63. The end of the pull rod body 650 with a smaller width is provided with a through hole serving as a tripping drive part 652. The tripping drive part 652 cooperates with a tripping trigger part 2311 on the traction rod 23. A chute 651 is opened in the middle of the pull rod body 650. The chute 651 is a strip-shaped groove, and the length of the chute 651 is equal to the moving stroke of the armature 63. At least on the pull rod body 650 on one side of the chute 651, a second groove a2 is provided. Figure 23 , 24 In FIGS., the two second grooves a2 are symmetrically arranged on both sides of the chute 651. One end of each second groove a2 is further provided with a second fixing part a1. When the second resetting member 662 is arranged in the second groove a2, one end of the second resetting member 662 abuts against the second fixing part a1.

[0163] In this embodiment, the first bracket 64 is a plate-shaped structure. The first bracket 64 is parallel and opposite to the second conductive plate 61, and the length of the first bracket 64 is less than that of the second conductive plate 61. A fastening screw is provided on the first bracket 64, which can fix the first bracket 64 inside the circuit breaker. The fastening screw can be used as a sliding part for sliding cooperation with the chute 651 of the pull rod 65 to limit the stroke of the pull rod 65 and the armature 63.

[0164] As another cooperation mode between the first bracket 64 and the second conductive plate 61, the first bracket 64 can also be arranged at the side position of the second conductive plate 61. At this time, the structure of the first bracket 64 can also adopt the above structure, except that the plane where the first bracket 64 is located and the plane where the second conductive plate 61 is located form an angle, for example, perpendicular to each other. Such a structure can also cooperate with the pull rod 65 to limit the movement track of the armature 63, but the overall space it occupies is large, and the armature 63 is prone to interference during the movement process.

[0165] As another structure of the first bracket 64, the first bracket 64 can be a U-shaped frame covering the armature 63 and the pull rod 65. One plane of the U-shaped frame of the first bracket 64 is spaced opposite to the second conductive plate 61, and a moving space is formed between this plane and the second conductive plate 61. A sliding structure that cooperates with each other is arranged between the pull rod 65 and this plane. The sliding structure can adopt the structure in the above embodiment to limit the movement track of the armature 63. Of course, the armature 63 and the pull rod 65 can simultaneously slide and cooperate with the first bracket 64.

[0166] The first bracket 64 is fixed inside the housing 11 through a fastening screw. Of course, the first bracket 64 can also be omitted, and a partial area of the first side wall 1103 of the housing 11 can directly serve as the first bracket 64 for sliding cooperation with the armature 63 or the pull rod 65 as well.

[0167] A first installation groove (not shown) and a second groove a2 are arranged inside the housing 11. The first installation groove is used for assembling the first reset member 661. A first fixing part can be arranged in the first installation groove. The two ends of the first reset member 661 are respectively connected to the first fixing part and the armature 63. The second groove a2 in the housing 11 and the second groove a2 of the pull rod 65 cooperate with each other to form a second installation groove for limiting the second reset member 662.

[0168] In this embodiment, the short-circuit protection mechanism 6 is arranged between the first side wall 1103 and the inner shell 12, one end of the second conductive plate 61 is connected to the terminal 7, and the other end of the second conductive plate 61 can pass through the inner shell 12, so that the second conductive plate 61 is located at one end of the inner shell 12 and is connected to the static contact 34 or forms the static contact 34, the first bracket 64 can be fixed on the first side wall 1103 or the inner shell 12, and the second groove a2 and the first mounting groove are arranged on the inner shell 12.

[0169] Preferably, at least one pair of positioning protrusions 1211 is provided on the inner shell 12, and the positioning protrusions 1211 cooperate to limit the moving track of the pull rod 65. Figure 22 As shown, two pairs of positioning protrusions 1211 are provided on the inner shell 12, wherein the spacing between one pair of positioning protrusions 1211 is smaller, and the spacing between the other pair of positioning protrusions 1211 is larger, and a gap is reserved between each pair of positioning protrusions 1211 for the pull rod 65 to move, and the contact surface of each positioning protrusion 1211 for contacting the pull rod 65 is an arc-shaped surface, and the specific shape of the positioning protrusion 1211 is not limited.

[0170] Combination Figure 3 , 8 34-36 provide a feedback device 8 applied to this embodiment.

[0171] The feedback device 8 is disposed in the attachment slot 124 of the inner shell 12. The feedback device 8 includes a device housing, in which a first micro switch 82 and a buffer 83 are disposed. A toggle portion 311 is disposed on the rotating shaft 31. The trigger portion of the first micro switch 82 is located on the moving track of the toggle portion 311, and the buffer 83 is located on the side of the trigger portion facing away from the first micro switch 82. In this way, the first micro switch 82 is disposed in the device housing so that the first micro switch 82 is not easily affected by the environment. The buffer 83 is configured in the device housing to effectively buffer the impact force of the rotating shaft 31 on the first micro switch 82, which is conducive to improving the service life of the first micro switch 82.

[0172] Specifically, Figure 8 and 36A pair of feedback devices 8 spaced opposite to each other in the second direction are provided in the accessory slot 124. The feedback device 8 is provided in the accessory slot 124 adjacent to the wiring cavity for easy wiring. Preferably, a straight-plate-shaped second bracket 126 is provided on one side of the accessory slot 124. A feedback device 8 is fixed at each end of the second bracket 126. The toggle portion 311 swings between the pair of feedback devices 8. That is, when the shaft 31 is opened and rotated, the toggle portion 311 cooperates with one of the feedback devices 8, and when the shaft 31 is closed and rotated, the toggle portion 311 cooperates with the other feedback device 8, so that the control module can obtain the position of the shaft 31 according to the signals fed back by the two feedback devices 8. Alternatively, one of the two feedback devices 8 is used to feedback the closing and opening status, and the other is used to feedback the fault tripping status; when the shaft 31 rotates to close the switch, the toggle part 311 drives one feedback device 8 to indicate closing the switch; when the shaft 31 rotates to fault trip, the toggle part 311 drives the other feedback device 8 to indicate tripping and opening; when the shaft 31 rotates to open the switch, both feedback devices 8 are not driven by the toggle part 311 and are used to indicate opening.

[0173] like Figure 35 As shown, the device shell of each feedback device 8 includes an upper cover 811 and a lower cover 812 assembled with each other, and a accommodating space is formed between the upper cover 811 and the lower cover 812. The accommodating space is provided with an opening on the side facing the toggle portion 311, and a first micro switch 82 and a buffer 83 are arranged in the accommodating space. The buffer 83 can be a spring, one end of the spring abuts against a side of the first micro switch 82 facing away from the trigger portion, and the other end abuts against the device shell. The trigger portion of the first micro switch 82 is exposed from the opening, and the trigger portion of the first micro switch 82 is located on the moving trajectory of the toggle portion 311, that is, the trigger portion of the first micro switch 82 can cooperate with the inclined surface of the toggle portion 311. A split device shell is used to facilitate the assembly of the first micro switch 82 and the buffer 83 in the accommodating cavity.

[0174] Combination Figure 3 and 37 -42 provides an auxiliary switch module 9 applied to the present embodiment. In the third direction, the auxiliary switch module 9 is arranged between the operating mechanism 2 and the feedback device 8. The auxiliary switch module 9 is connected to the control module and is used to output a pre-closing or pre-opening signal. The auxiliary switch module 9 includes at least two second micro switches 93 arranged in parallel. During the closing process, at least one of the second micro switches 93 is triggered by the tripping shaft 21 before the moving contact 32 contacts the static contact 34, so that the auxiliary switch module 9 outputs a pre-closing signal; during the opening process, at least another second micro switch 93 is triggered by the rotating shaft 31 before the moving contact 32 separates from the static contact 34, so that the auxiliary switch module 9 outputs a pre-opening signal.

[0175] In this way, before the moving contact 32 contacts or separates from the static contact 34, the second microswitch 93 is triggered by the tripping shaft 21 and the rotating shaft 31 respectively. By controlling the second microswitch 93, the auxiliary switch module 9 outputs a pre-closing or pre-opening signal in advance, thereby improving the sensitivity of the auxiliary switch module 9 and the reliability of the product.

[0176] Specifically, Figure 37 - 39 As shown, a first toggle member 91 is connected to the tripping shaft 21, and a second toggle member 92 is rotatably mounted on one side of the operating mechanism 2. Preferably, in the third direction, the first toggle member 91 and the second toggle member 92 are both located on the same side of the operating mechanism 2, and a gap for mounting a second micro switch 93 is reserved between the first toggle member 91 and the second toggle member 92. At least one triggering portion 2311 of the second micro switch 93 is located on the moving track of the first toggle member 91, and at least another triggering portion 2311 of the second micro switch 93 is located on the moving track of the second toggle member 92. Furthermore, a third reset member 95 is also connected to the second toggle member 92, and the third reset member 95 drives the second toggle member 92 to reset.

[0177] The auxiliary switch module 9 is located between the inner shell 12 and the first end cover 1101 between the accessory slot 124 and the operating mechanism 2. The auxiliary switch module 9 includes at least two second micro switches 93 arranged in parallel in the third direction. The first toggle member 91 is connected to the tripping shaft 21. The second toggle member 92 is rotatably arranged on one side of the operating mechanism 2 and the second toggle member 92 is linked to the rotating shaft 31. Preferably, in the third direction, the first toggle member 91 and the second toggle member 92 are both located outside a pair of side plates, and the second micro switches 93 arranged in parallel are arranged between the first toggle member 91 and the second toggle member 92. There is at least one The triggering part of the second microswitch 93 is located on the moving trajectory of the first toggle member 91. During the closing process, the first toggle member 91 first triggers the triggering part of at least one second microswitch 93, so that the auxiliary switch module 9 outputs a pre-closing signal. Subsequently, the moving contact 32 contacts the static contact 34. At least another triggering part of the second microswitch 93 is located on the moving trajectory of the second toggle member 92. During the opening process, the second toggle member 92 first triggers the triggering part of another second microswitch 93 as the shaft 31 rotates to open the switch, so that the auxiliary switch outputs a pre-opening signal. Subsequently, the moving contact 32 separates from the static contact 34.

[0178] Preferably, the second micro switch 93 is arranged on one side of the operating mechanism 2 through the third bracket 94, and two adjacent second micro switches 93 are separated by a partition plate on the third bracket 94. Figure 37 - 40A third bracket 94 applied to the present embodiment is provided. The third bracket 94 is fixed to one side of the operating mechanism 2. That is, the third bracket 94 is arranged in parallel with a pair of side plates in the third direction and the third bracket 94 is located outside the pair of side plates. The third bracket 94 includes a first assembly groove 941 and a second assembly groove 942. Figure 40 The first assembly groove 941 and the second assembly groove 942 are both rectangular grooves, and the opening of the first assembly groove 941 and the opening of the second assembly groove 942 are located on the same side of the third bracket 94. In the present embodiment, the openings of the first assembly groove 941 and the second assembly groove 942 are both facing the first end cover 1101, wherein the first groove bottom of the first assembly groove 941 is higher than the second groove bottom of the second assembly groove 942, so that the first groove bottom and the second groove bottom are connected to form a step surface, and a matching hole is provided in the first groove bottom so that the triggering part of the second micro switch 93 is exposed from the matching hole, and the first toggle member 91 and the second toggle member 92 trigger the second micro switch 93 from outside the first groove bottom; the second assembly groove 942 can be equipped with other accessories, such as a release.

[0179] In addition, in this embodiment, a plurality of spaced-apart partitions are provided in the first assembly groove 9411, and the space in the first assembly groove 9411 is divided into a plurality of independent spaces by the partitions, so that two adjacent second micro switches 93 are separated by the partitions.

[0180] Of course, the third bracket 94 may not be provided, and the second micro switch 93 may be directly provided at the outer end of the inner shell 12 adjacent to the operating end, and the second micro switch 93 may be fixed on the inner shell 12. However, this structure is not conducive to forming a modular auxiliary switch module 9, and the disassembly and assembly are cumbersome.

[0181] Combination Figure 37 , 38 41 provides a specific structure of a first toggle member 91, the first toggle member 91 includes a rod-shaped body, one end of the rod-shaped body is provided with a first connecting boss 911, and a connecting hole (not shown) is opened on the side of the first connecting boss 911 facing the tripping shaft 21. Figure 41 In the figure, the connecting hole is rotatably connected with one end of the jump button shaft 21 that rotates through the side plate, and the other end of the rod-shaped body is bent to form a first driving part 912 for triggering the second micro switch 93, and the first driving part 912 and the first connecting boss 911 are respectively located on the opposite sides of the rod-shaped body. The first driving part 912 and the first connecting boss 911 make the first toggle member 91 as a whole Z-shaped, and the first driving part 912 extends outside the bottom of the first groove and is spaced opposite to the bottom of the first groove.

[0182] In this embodiment, one end of the second toggle member 92 is rotatably connected, and the other end of the second toggle member 92 is linked with the engaging portion of the rotating shaft 31. The middle of the second toggle member 92 is spaced opposite to the triggering portion of at least one microswitch. Preferably, a third reset member 95 is assembled at the rotatable end of the second toggle member 92, and the third reset member 95 provides a reset force for the second toggle member 92.

[0183] Combined Figure 37 , 39 and 42 provide a specific structure of the second toggle member 92 applied to this embodiment. The second toggle member 92 includes a pair of connecting arms 331 arranged at intervals. One end of the pair of connecting arms 331 is provided with a connecting hole as the second connecting end 921, and a section of connecting shaft is arranged in the connecting hole. The second toggle member 92 can be rotatably arranged outside the bottom of the first groove through the pair of connecting arms 331 and the connecting shaft. The other ends of the pair of connecting arms 331 are connected together to form a second driving portion 922. The second driving portion 922 is spaced opposite to the bottom of the first groove for triggering the second microswitch 93. The second driving portion 922 is connected with a bent arm, and the bent arm serves as a linkage portion 923 and is linked with the rotating shaft 31. Figure 39 In, one end of one of the connecting arms 331 extends parallel and then deflects away from the second driving portion 922 to form the linkage portion 923. The end of the linkage portion 923 is a cone with a gradually decreasing width, which facilitates the insertion of the linkage portion 923 into the accessory groove 124 to be inserted with the engaging portion.

[0184] Further, as Figure 37 shown, a torsion spring serving as the third reset member 95 is sleeved on the connecting shaft. One elastic arm of the torsion spring abuts against the second toggle member 92, and the other elastic arm abuts against a fixed component in the housing 11 or the side wall of the housing 11, so that the torsion spring undergoes elastic deformation to provide an elastic reset force for the second toggle member 92.

[0185] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when in use and commonly placed. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0186] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. Circuit breaker, comprising a housing (11), opposite ends of the housing (11) being an operating end and a wiring end respectively, an operating mechanism (2) and at least one breaker pole being provided within the housing (11), each said breaker pole comprising a contact mechanism (3), an arc extinguishing system (4), an instrument transformer (5), a short-circuit protection mechanism (6) and a pair of connection terminals (7), characterized in that: The operating mechanism (2), the contact mechanism (3), and the arc extinguishing system (4) are sequentially arranged along a first direction from the operating end to the wiring end. The wiring end is provided with at least a pair of wiring sockets (112) spaced apart in a second direction. An air outlet (113) communicating with the arc extinguishing system (4) is provided between each pair of wiring sockets (112). The current transformer (5), the contact mechanism (3), and the short-circuit protection mechanism (6) are sequentially arranged in the housing (11) along the second direction, and the first direction is perpendicular to the second direction.

2. The circuit breaker according to claim 1, characterized in that: An inner housing (12) for accommodating the breaker pole is further provided in the housing (11). An exhaust port (123) is provided at one end of the inner housing (12), and the exhaust port (123) is correspondingly communicated with the air outlet (113) of the wiring end.

3. The circuit breaker according to claim 2, wherein: Adjacent two breaker poles are arranged side by side in a third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

4. The circuit breaker according to claim 3, wherein: A wiring cavity is formed between the outer side wall of the inner housing (12) and the inner side wall of the housing (11) along the first direction. In the same breaker pole, a first conductive plate (52) arranged along the first direction is connected between the current transformer (5) and the adjacent terminal (7). The current transformer (5) is arranged in the inner housing (12), and the first conductive plate (52) is arranged in the wiring cavity.

5. The circuit breaker according to claim 4, characterized in that: The current transformer (5) is fixedly attached to the plate surface of the first conductive plate (52), and the axis of the central hole of the current transformer (5) is parallel to the second direction and perpendicular to the plate surface of the first conductive plate (52). A conductive busbar (71) is arranged in the central hole of the current transformer (5), and the conductive busbar (71) is connected between the first conductive plate (52) and the contact mechanism (3).

6. The circuit breaker according to claim 4, characterized in that: The wiring cavity is divided into a first wiring cavity (1161) and a second wiring cavity (1162). In the second direction, the first wiring cavity (1161) is located between the outer side wall of the inner housing (12) and the inner side wall of the housing (11). The first conductive plate (52) of each breaker pole is arranged in the first wiring cavity (1161), and a plurality of heat dissipation holes (115) are provided in the side wall of the housing (11) corresponding to the first wiring cavity (1161). In the third direction, the second wiring cavity (1162) is located between the outer side wall of the inner housing (12) and the inner side wall of the housing (11). A circuit board is arranged in the housing (11), and the signal terminal (73) of the circuit board is located in the second wiring cavity (1162) and exposed from the wiring port (114) opened at the wiring end.

7. The circuit breaker according to claim 3, characterized in that: A terminal installation groove (125) is provided in the wiring cavity near the wiring socket (112), and the terminal (7) is arranged in the terminal installation groove (125).

8. The circuit breaker according to claim 2, characterized in that: The short - circuit protection mechanism (6) includes a second conductive plate (61), a magnetic yoke (62), an armature (63), and a first bracket (64). The second conductive plate (61) is arranged along a first direction and passes through the gap between the magnetic yoke (62) and the armature (63). The two ends of the magnetic yoke (62) are bent along the two side edges of the second conductive plate (61) respectively and extend towards the direction close to the armature (63), so that the magnetic yoke (62) and the armature (63) cooperate to surround the outside of the second conductive plate (61), and a magnetic gap is formed by the cooperation of the magnetic yoke (62) and the armature (63) on one side of the second conductive plate (61). The armature (63) moves linearly along the first direction relative to the first bracket (64) and the second conductive plate (61). A pull rod (65) connected to the armature (63) is used to drive the tripping of the operating mechanism (2). The pull rod (65) and / or the armature (63) are in sliding fit with the first bracket (64) to limit the movement track of the armature (63).

9. The circuit breaker according to claim 8, wherein: An installation groove is provided on the side wall of the inner shell (12). The magnetic yoke (62) and the armature (63) are relatively embedded in the installation groove at intervals in the first direction, and the armature (63) moves in the installation groove along the first direction. The first bracket (64) and the pull rod (65) are located between the inner shell (12) and the outer shell (11). One end of the second conductive plate (61) is located inside the inner shell (12) and is parallel and opposite to the first bracket (64). The first bracket (64) and the second conductive plate (61) cooperate to leave a moving space outside the inner shell (12), and the armature (63) and the pull rod (65) move in the moving space.

10. The circuit breaker according to claim 8, characterized in that: One end of the second conductive plate (61) extends outside the inner shell (12) and is connected to an adjacent terminal (7). The other end of the second conductive plate (61) is located inside the inner shell (12) and is folded back to form a static contact plate (341) parallel and opposite to the second conductive plate (61). A static contact point (342) is provided on the side of the static contact plate (341) facing the mutual inductor (5).

11. The circuit breaker according to claim 2, characterized in that: The arc - extinguishing system (4) includes an arc - extinguishing chamber (41) and an exhaust passage (42). The contact mechanism (3), the arc - extinguishing chamber (41), and the exhaust passage (42) are sequentially arranged in the inner shell (12) along the first direction. The inlet (421) of the exhaust passage (42) is communicated with the exhaust end side position of the arc - extinguishing chamber (41), and the outlet of the exhaust passage (42) is communicated with the exhaust port (123).

12. The circuit breaker according to claim 11, characterized in that: A pressure - regulating member (43) is also rotatably arranged in the exhaust passage (42). The pressure - regulating member (43) is driven by the air pressure difference between the exhaust passage (42) and the exhaust end, so that the exhaust passage (42) is kept in communication or blocked with the exhaust end.

13. The circuit breaker according to claim 12, characterized in that: The distance between the movable end (432) and the connecting end (431) of the pressure regulating member (43) is greater than the inner diameter of the inlet (421), so that the movable end (432) extends to the middle of the exhaust channel (42) and moves in the exhaust channel (42); the pressure regulating member (43) is connected to a limiting member (434), and the limiting member (434) cooperates with the side wall of the exhaust channel (42) to limit the rotation range of the movable end (432).

14. The circuit breaker according to claim 11, characterized in that: A plurality of arc-extinguishing members (44) arranged at intervals in a first direction are mounted inside one end of the exhaust passage (42) away from the arc-extinguishing chamber (41), each arc-extinguishing member (44) is provided with a plurality of communication holes, and the communication holes of two adjacent arc-extinguishing members (44) are arranged in a staggered manner.

15. The circuit breaker according to claim 2, characterized in that: The contact mechanism (3) comprises a movable contact assembly and a stationary contact (34) which cooperate with each other, the movable contact assembly comprising a rotating shaft (31) and a movable contact (32), the rotating shaft (31) being rotatably assembled and drivingly connected to the operating mechanism (2), a contact cavity (312) being provided in the middle of the rotating shaft (31), one end of the movable contact (32) being located outside the contact cavity (312) and being provided with a movable contact (321), the stationary contact (34) comprising a stationary contact plate (341), the stationary contact plate (341) being arranged along a first direction and being provided with a stationary contact (342), the movable contact (321) and the stationary contact (342) being spaced apart and opposed to each other in a second direction.

16. The circuit breaker according to claim 15, wherein: The moving contact assembly also includes a baffle (33) coaxially connected to the moving contact (32), the baffle (33) including at least one connecting arm (331), the connecting arm (331) being fitted and fixed to a side wall of the moving contact (32), the connecting arm (331) being connected to a shielding portion (332), the shielding portion (332) being located in the contact cavity (312) and spanning and covering a middle region of the moving contact (32) facing away from the moving contact point (321).

17. The circuit breaker according to claim 16, characterized in that: The moving contact (32) comprises a plurality of moving contact pieces (320) arranged in parallel in a third direction, two adjacent moving contact pieces (320) are separated by a connecting arm (331), and the third direction is perpendicular to the first direction and the second direction respectively.

18. The circuit breaker according to claim 15, characterized in that: An accessory slot (124) is provided at one end of the inner shell (12) close to the operating end. In the third direction, the accessory slot (124) is located on one side of the operating mechanism (2). A through hole is provided at the bottom of the accessory slot (124). A feedback device (8) cooperating with the rotating shaft (31) is provided in the accessory slot (124). An auxiliary switch module (9) is provided in the space between the inner shell (12) and the outer shell (11) between the accessory slot (124) and the operating mechanism (2).

19. The circuit breaker according to claim 18, characterized in that: A pair of feedback devices (8) spaced apart in a second direction are arranged in the accessory slot (124), and the rotating shaft (31) is provided with a toggle portion (311), which extends from a through hole of the accessory slot (124) into the accessory slot (124) and swings between the pair of feedback devices (8).

20. The circuit breaker according to claim 18, wherein: The operating mechanism (2) includes a toggle shaft (21) rotatably assembled, a toggle (22) is connected to the toggle shaft (21), the rotating shaft (31) is linked with the toggle (22), the auxiliary switch module (9) includes at least two second microswitches (93) arranged side by side in the third direction. During the closing process, at least one second microswitch (93) is triggered by the toggle shaft (21) before the moving contact (32) contacts the static contact (34). During the opening process, at least another second microswitch (93) is triggered by the rotating shaft (31) before the moving contact (32) separates from the static contact (34).

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