Circuit breaker

Abstract

The circuit breaker comprises a detachable outer shell, one end of the outer shell serves as an operation end and is provided with an operation hole, the central axis of the operation hole is parallel to a first direction, an inner shell is arranged in the outer shell, an operation mechanism is assembled between the inner shell and the operation hole, at least one circuit breaker pole is arranged in the inner shell, and the circuit breaker pole is arranged in the inner shell. The inner shell comprises a base and a middle cover, the base comprises two assembly bodies, the two assembly bodies are spliced in the direction perpendicular to the first direction, at least one assembly body is divided into at least two assembly plate blocks, every two adjacent assembly plate blocks are spliced in a stacked mode in the first direction, and the middle cover is arranged in the middle of the base. The middle cover covers the ends, close to the operating mechanism, of the two assembling bodies in the first direction. In the utility model, the inner shell consists of the base and the middle cover which are assembled, the base adopts a split assembly structure, and parts in the circuit breaker pole form a modular structure, so that the disassembly and the installation are convenient.

Description

Technical Field

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

[0002] A circuit breaker refers to a switching device that can close, carry, and interrupt the current under normal circuit conditions and can close, carry, and interrupt the current under abnormal circuit conditions within a specified time. In existing molded case circuit breakers, components such as the contact mechanism and accessory module are usually assembled on a base that is not easily disassembled. Coupled with the complex internal structure and cumbersome layout, it is not conducive to forming a modular structure, and it is also not conducive to measuring contact parameters and maintaining and replacing parts. Summary of the Invention

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

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a circuit breaker, including a detachable housing. One end of the housing serves as an operating end and is provided with an operating hole. The central axis of the operating hole is parallel to the first direction. An inner housing is arranged inside the housing. An operating mechanism is assembled between the inner housing and the operating hole. At least one circuit breaker pole is arranged inside the inner housing. The inner housing includes a base and a middle cover. The base includes two assemblies, and the two assemblies are assembled in a direction perpendicular to the first direction. At least one assembly is divided into at least two assembly plates, and adjacent two assembly plates are stacked and assembled in the first direction. The middle cover covers one end of the two assemblies close to the operating mechanism in the first direction.

[0006] Preferably, the circuit breaker pole includes a contact mechanism. The contact mechanism includes a rotating shaft, a moving contact, and a static contact. The rotating shaft is rotatably assembled on the middle cover and is drivingly connected to the operating mechanism. The moving contact is connected to the rotating shaft and rotates in the space between the middle cover and the assembly plate adjacent to the middle cover. The static contact is cooperatively arranged on the assembly plate adjacent to the middle cover and cooperates with the moving contact.

[0007] Preferably, the circuit breaker pole further includes an arc extinguishing system. The arc extinguishing system includes an arc extinguishing chamber. The arc extinguishing chamber and the static contact are located between the same assembly plate and the middle cover. The moving trajectory of the moving contact corresponds to the incoming arc end of the arc extinguishing chamber.

[0008] Preferably, the arc extinguishing system further includes an exhaust passage. The exhaust passage is arranged in the base far from the middle cover. One end of the exhaust passage is communicated with the exhaust end of the arc extinguishing chamber, and the other end of the exhaust passage is communicated with an exhaust port arranged on the base.

[0009] Preferably, the exhaust port is arranged in the middle of an assembly plate away from the middle cover, and at least one deionization component is configured on the exhaust port.

[0010] Preferably, the breaker pole further includes an instrument transformer and a short-circuit protection mechanism. The short-circuit protection mechanism is adjacent to the static contact and arranged on the same assembly plate. The instrument transformer is adjacent to the moving contact in the opening position, and the instrument transformer is arranged on the assembly body or the assembly plate close to the middle cover.

[0011] Preferably, at least one accessory slot is arranged on one side of the middle cover facing the operation end, and an accessory module cooperating with the operating mechanism is assembled in the accessory slot.

[0012] Preferably, a control module is further arranged in the housing. The control module includes a circuit board assembly. The circuit board assembly is arranged on one side of the middle cover facing the housing, and the circuit board assembly is provided with a display screen. An indicating window is arranged on the housing opposite to the display screen.

[0013] Preferably, the housing includes a pair of end covers arranged at intervals. One of the end covers serves as the operation end and is provided with a wiring hole, and the other end cover serves as the wiring end and is provided with a wiring socket. Two pairs of side walls are connected between the pair of end covers, and each pair of side walls is arranged opposite to each other at intervals.

[0014] Preferably, the other end of the housing away from the operation end is the wiring end. The wiring end is provided with a wiring socket. Each breaker pole is provided with a wiring terminal corresponding to the wiring socket, and the wiring terminal is arranged inside the housing outside the inner housing.

[0015] Preferably, a gap serving as a wiring cavity is left between the inner side wall of the housing and the outer side wall of the inner housing, and the wiring cavity is arranged along the direction parallel to the central axis of the operation hole.

[0016] Preferably, it includes at least two breaker poles. A partition is arranged on the inner side wall of the inner housing. The partition divides the interior of the inner housing into at least two juxtaposed chambers. The partition correspondingly forms a dividing part on the outer side wall of the inner housing. The dividing part is used to divide the space between the outer side wall of the inner housing on the same side and the inner side wall of the housing into at least two wiring cavities.

[0017] Preferably, each breaker pole includes a pair of wiring terminals and a contact mechanism connected between the pair of wiring terminals. Each wiring terminal includes a terminal assembly and a conductive bus connected to the terminal assembly. The terminal assembly corresponds to the wiring socket opened on the housing. The conductive bus of one of the wiring terminals extends into the inner housing and is connected to the static contact of the contact mechanism. A first conductive plate is connected between the conductive bus of the other wiring terminal and the moving contact in the contact mechanism. The first conductive plate is arranged in the wiring cavity.

[0018] The circuit breaker of the present utility model has an inner shell composed of a base and a middle cover assembled together. The base adopts a split assembly structure and is assembled along a direction perpendicular to the first direction through an assembly body. The assembly body is assembled along the first direction through assembly plates, forming a modular structure for the components inside the circuit breaker pole, which facilitates disassembly and installation.

[0019] In addition, the contact mechanism is arranged between the middle cover and the assembly plate adjacent to the middle cover, which is beneficial for disassembly and installation, convenient for measuring contact parameters and maintaining and replacing the parts of the contact mechanism.

[0020] In addition, the arc extinguishing chamber in the arc extinguishing system and the contact mechanism are located between the same assembly plate and the middle cover, ensuring the cooperation between the arc extinguishing chamber and the contact mechanism.

[0021] In addition, the short-circuit protection mechanism, the current transformer and the static contact are located on the same assembly plate. The current transformer is arranged on the assembly body close to the middle cover or on the assembly plate close to the middle cover, which is beneficial for forming a modular structure and convenient for disassembly, installation, maintenance and replacement.

[0022] In addition, the outer shell also adopts a split structure, which is convenient for disassembly and installation.

[0023] In addition, a wiring cavity is formed between the outer shell and the inner shell, which is convenient for wiring and reduces the complexity of the internal layout. Description of the Drawings

[0024] Figure 1 is the structural schematic diagram of the circuit breaker of the present utility model Figure 1 (Removing the second side wall);

[0025] Figure 2 is the structural schematic diagram of the circuit breaker of the present utility model Figure 2 (Removing the second side wall);

[0026] Figure 3 is the structural schematic diagram of the circuit breaker of the present utility model (terminal);

[0027] Figure 4 is the exploded structural schematic diagram of the circuit breaker of the present utility model;

[0028] Figure 5 is the structural schematic diagram of two assembly bodies in the present utility model;

[0029] Figure 6 is the structural schematic diagram of the second assembly plate in the present utility model;

[0030] Figure 7 is the cross-sectional view of the moving contact and the rotating shaft in the present utility model;

[0031] Figure 8 is the structural schematic diagram of the short-circuit protection mechanism in the present utility model;

[0032] Figure 9 It is a schematic diagram of the matching of the mutual inductor, the first conductive plate and the terminal block in the utility model;

[0033] Figure 10 It is a structural schematic diagram of the wiring terminal in the utility model;

[0034] Reference numerals:

[0035] 1A-operating end, 1B-wiring end, 11-housing, 1101-first end cover, 1102-second end cover, 1103-first side wall, 111-operating hole, 112-wiring socket, 113-air outlet, 115-indicating window, 1161-first wiring cavity, 1162-second wiring cavity, 12-inner housing, 121-middle cover, 122-assembly body, 1221-first assembly plate, 12211-first bearing part, 1222-second assembly plate, 12221-second bearing part, 123-partition plate, 124-partition part, 2-operating mechanism, 20-operating member, 21-push Rod, 211-trigger part, 3-contact mechanism, 31-rotating shaft, 32-moving contact, 34-static contact, 41-arc extinguishing chamber, 51-transformer, 511-wiring part, 52-first conductive plate, 53-wiring row, 531-connector, 532-wiring pin, 6-short-circuit protection mechanism, 61-second conductive plate, 62-yoke, 63-armature, 64-first bracket, 65-pull rod, 651-slide, 652-tripping drive part, 7-wiring terminal, 71-conductive row, 72-terminal assembly, 81-circuit board assembly, 82-display screen, 91-flux release, 92-reset plate. DETAILED DESCRIPTION

[0036] The following is a further description of the specific implementation of the circuit breaker of the present utility model in conjunction with the embodiments given in the accompanying drawings. The circuit breaker of the present utility model is not limited to the description of the following embodiments.

[0037] The circuit breaker includes a detachable and assembled shell 11, one end of the shell 11 serves as an operating end 1A and is provided with an operating hole 111, an inner shell 12 is provided inside the shell 11, an operating mechanism 2 is assembled between the inner shell 12 and the operating hole 111, an operating member 20 is connected to the operating mechanism 2, and the operating member 20 extends from the operating hole 111 to the outside of the shell 11 for manually driving the operating mechanism 2; of course, when a control module is configured in the shell 11, the operating mechanism 2 can also be driven by the control module, and the control module generally includes a circuit board assembly 81, a motor and a transmission assembly, wherein a controller is provided on the circuit board assembly 81, the motor is driven to start and stop by the controller, and the motor is connected to the operating mechanism 2 by the transmission assembly, thereby realizing automatic driving of the operating mechanism 2 to rotate for opening and closing.

[0038] At least one breaker pole is disposed in the inner housing 12. Each breaker pole includes a pair of terminal blocks 7. A contact mechanism 3 is connected between the pair of terminal blocks 7. The contact mechanism 3 includes a moving contact assembly and a stationary contact 34. The moving contact assembly is drivingly connected to the operating mechanism 2. By driving the operating mechanism 2, the moving contact assembly is driven to contact or separate from the stationary contact 34 to connect or disconnect the main circuit of each breaker pole. An arc extinguishing system is provided 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, and the exhaust gas generated by the arc extinguishing is discharged through the exhaust port provided in the inner housing 12 and the air outlet 113 provided in the outer housing 11.

[0039] Each breaker pole further includes a current transformer 51 and a short-circuit protection mechanism 6. The current transformer 51 is connected to the main circuit of each breaker pole. That is, the conductor connected between the contact mechanism 3 and the terminal block 7 passes through the central hole of the current transformer 51. The current transformer 51 is connected to the control module and is used to feedback 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 breaker pole, the short-circuit protection mechanism 6 drives the operating mechanism 2 to trip and cut off the power.

[0040] For convenience of description, the central axis direction of the operation hole 111 is the first direction, that is Figure 1 the direction in which the X axis is located in Figure 1 is the first direction, and the two directions perpendicular to the first direction are the second direction and the third direction. That is, Figure 1 the direction in which the Z axis is located in is the second direction, and the direction in which the Y axis is located in is the third direction.

[0041] The improvement of this application lies in that, as Figure 1 、 4 shown in -6, the inner housing 12 includes a base and a middle cover 121. The base includes two assemblies 122, and the two assemblies 122 are assembled along the direction perpendicular to the first direction. At least one assembly 122 is divided into at least two assembly plates (the first assembly plate 1221 and the second assembly plate 1222), and the adjacent two assembly plates are stacked and assembled in the first direction. The middle cover 121 is covered on one end of the two assemblies 122 close to the operating mechanism 2 in the first direction. Thus, the inner housing 12 is composed of the assembled base and the middle cover 121. The base adopts a split assembly structure. The base is assembled by the assemblies along the direction perpendicular to the first direction, and the assemblies are assembled by the assembly plates along the first direction, forming a modular structure for the components inside the breaker pole, which is convenient for disassembly and installation.

[0042] Specifically, the contact mechanism 3 of each breaker pole includes a moving contact assembly and a static contact 34 that cooperate with each other. The moving contact assembly includes a rotating shaft 31 and a moving contact 32. The rotating shaft 31 is rotatably assembled on the middle cover 121. The operating mechanism 2 passes through the middle cover 121 and is drivingly connected to the rotating shaft 31. That is, a connection hole for the driving connection between the operating mechanism 2 and the rotating shaft 31 is provided in the middle of the middle cover 121. The moving contact 32 is rotatably connected to the rotating shaft 31, so that the moving contact 32 rotates within the space between the middle cover 121 and the assembly plate adjacent to the middle cover 121. The static contact 34 is cooperatively arranged on the assembly plate adjacent to the middle cover 121 and cooperates with the moving contact 32, so that the contact mechanism 3 forms a modular structure within the inner shell 12. When it is necessary to measure the parameters of the contact mechanism 3 and maintain or replace the contact mechanism 3, it can be achieved by only disassembling the middle cover 121 and one assembly plate, with less interference to other components.

[0043] Furthermore, the contact mechanism 3 of each breaker pole is also configured with an arc extinguishing system. The arc extinguishing system includes an arc extinguishing chamber 41 and an exhaust passage. The arc extinguishing chamber 41 and the static contact 34 are located between the same assembly plate and the middle cover 121. The moving trajectory of the moving contact 32 corresponds to the incoming arc end of the arc extinguishing chamber 41, ensuring the cooperation between the arc extinguishing chamber 41 and the contact mechanism 3 and facilitating arc extinguishing. The exhaust passage is arranged in the base away from the middle cover 121. One end of the exhaust passage is communicated with the exhaust end of the arc extinguishing chamber 41, and the other end of the exhaust passage is communicated with an exhaust port provided on the base. The exhaust passage buffers the exhaust gas discharged from the arc extinguishing chamber 41, reducing the discharge of high-temperature exhaust gas from the outer shell 11.

[0044] Preferably, each breaker further includes an instrument transformer 51 and a short-circuit protection mechanism 6. The short-circuit protection mechanism 6 is adjacent to the static contact 34 and arranged in the same assembly plate. The short-circuit protection mechanism 6 cooperates with the operating mechanism 2. When a short-circuit fault occurs, the operating mechanism 2 is triggered to trip by the short-circuit protection mechanism 6. The instrument transformer 51 is adjacent to the moving contact 32 in the opening position. The instrument transformer 51 is arranged on the assembly body 122 close to the middle cover 121, or the instrument transformer 51 is arranged on the assembly plate close to the middle cover 121. The instrument transformer 51 is connected to the circuit board assembly 81 in the control module for feeding back the collected current signal. The short-circuit protection mechanism 6, the instrument transformer 51 and the inner shell 12 cooperate to form a modular structure, which is convenient for disassembly, installation, maintenance and replacement.

[0045] In addition, at least one accessory slot is provided on one side of the middle cover 121 facing the operating end 1A. The accessory module cooperating with the operating mechanism 2 can be assembled in the accessory slot. The accessory module can include an auxiliary switch module, a feedback device, a trip unit, etc. Of course, when the control module is provided in the housing 11 in the form of an accessory, one of the accessory slots is used to assemble the control module. The control module generally includes a circuit board assembly 81. The circuit board assembly 81 is arranged in an accessory slot of the middle cover 121, shortening the distance from the current transformer 51 and other accessory modules, which is convenient for wiring.

[0046] Combined with Figures 1 - 10 An embodiment of a circuit breaker is provided. In this embodiment, an insertion-type circuit breaker is taken as an example.

[0047] The circuit breaker includes a detachable housing 11. The opposite ends of the housing 11 are an operating end 1A and a wiring end 1B respectively. An operating hole 111 is provided in the middle of the operating end 1A. The central axis of the operating hole 111 is parallel to the first direction. The connection line between the operating end 1A and the wiring end 1B is parallel to the first direction. An operating mechanism 2 and an inner housing 12 are arranged between the operating end 1A and the wiring end 1B 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 1A. The operating member 20 connected to the operating mechanism 2 extends out of the housing 11 from the operating hole 111 of the operating end 1A. The wiring end 1B is provided with three pairs of wiring sockets 112 arranged side by side in the third direction. Each pair of wiring sockets 112 is spaced relatively in the second direction, and an air outlet 113 is provided between each pair of wiring sockets 112. One end of the inner housing 12 is provided with three exhaust ports arranged side by side in the third direction. Each exhaust port corresponds to and communicates with an air outlet 113.

[0048] In this embodiment, the housing 11 is of a detachable and assembled structure. The housing 11 includes a pair of end covers spaced apart in the first direction. The two end covers serve as the operating end 1A and the wiring end 1B respectively. For the convenience of description, the two end covers are the first end cover 1101 and the second end cover 1102 respectively. An operating hole 111 is provided in the middle of the first end cover 1101. An indicating window 115 is provided on one side of the operating hole 111. The indicating window 115 can be a transparent area or a through groove communicating with the inside of the housing 11. The second end cover 1102 is provided with wiring sockets 112 and air outlets 113. The second end cover 1102 is used to prevent the wiring terminal 7 corresponding to the wiring socket 112 from falling off. Two pairs of side walls are connected between the pair of end covers. Each pair of side walls is spaced apart. For the convenience of description, the two pairs of side walls are divided into a pair of first side walls 1103 and a pair of second side walls. The pair of first side walls 1103 are spaced relatively in the second direction, and the pair of second side walls are spaced relatively in the third direction. Of course, the housing 11 can also adopt other detachable structures.

[0049] The operating mechanism 2 can adopt the prior art. 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 toggle shaft and a locking shaft are rotatably arranged between the pair of side plates, and the toggle shaft and the locking shaft are respectively located on opposite sides of the space between the pair of side plates. The toggle shaft and the locking shaft are respectively connected with a toggle and a lock. One end of the toggle and the lock are buckled and matched. A connecting rod assembly is connected to the toggle. Generally, the connecting rod assembly includes an upper connecting rod and a lower connecting rod. One end of the upper connecting rod is connected to the toggle. A rocker 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 to the rotating shaft 31 in the circuit breaker pole. The lock is in limit cooperation with the re-latch rotatably arranged between the pair of side plates.

[0050] In addition, a traction rod spanning three circuit breaker poles is arranged on one side of the operating mechanism 2. The traction rod is used to drive the re-latch to release the limit cooperation between the re-latch and the lock, and the lock and the toggle to release the buckling cooperation, so as to realize the tripping of the operating mechanism 2. In this embodiment, three push rods 21 are sleeved on the traction rod. Each push rod 21 is provided with a tripping trigger part 211, and each tripping trigger part 211 corresponds to a circuit breaker pole respectively.

[0051] Inside the inner shell 12, three circuit breaker poles are arranged side by side in the third direction. Each circuit breaker pole includes a pair of terminal blocks 7 arranged at intervals in the second direction. Each pair of terminal blocks 7 corresponds to a pair of wiring sockets 112 on the outer shell 11 respectively. A contact mechanism 3 is connected between the pair of terminal blocks 7. An arc extinguishing system is arranged on one side of the contact mechanism 3. In this embodiment, the operating mechanism 2, the contact mechanism 3 and the arc extinguishing system are arranged in sequence along the first direction. One end of the arc extinguishing system of each circuit breaker pole away from the contact mechanism 3 is communicated with an exhaust port of the inner shell 12; A current transformer 51 and a short-circuit protection mechanism 6 are also arranged in each circuit breaker pole. The current transformer 51, the contact mechanism 3 and the short-circuit protection mechanism 6 are arranged in sequence along the second direction in the inner shell 12.

[0052] As Figures 4 - 6 shown, a partition plate 123 is arranged on the inner side wall of the inner shell 12. The space inside the inner shell 12 is divided into three chambers arranged side by side in the third direction by the partition plate 123. Each chamber is used to assemble a circuit breaker pole. It should be noted that the partition plate 123 can be one, two or more than three, and its number is usually adjusted according to the number of circuit breaker poles to be assembled. Further, the partition plate 123 correspondingly forms a partition part 124 on the outer side wall of the inner shell 12, which is convenient for the partition part 124 to divide the outer side wall of the inner shell 12 on the same side into grooves arranged side by side in the third direction. In this embodiment, the partition part 124 faces the first side wall 1103 of the outer shell 11.

[0053] As Figure 1 、4 As shown in FIG. -6, the inner shell 12 includes two assemblies 122 and a middle cover 121. The two assemblies 122 are assembled in a direction perpendicular to the first direction. The middle cover 121 is closed on one end of the two assemblies 122 close to the operating mechanism 2 in the first direction. In this embodiment, the two assemblies 122 are assembled in the second direction. In other embodiments, the two assemblies 122 may also be assembled in the third direction. At least one assembly 122 is divided into at least two assembly plates, and two adjacent assembly plates are stacked and assembled in the first direction. For convenience of description, the two assemblies 122 are respectively the first assembly 122 and the second assembly 122, wherein the second assembly 122 is divided into two assembly plates, and the two assembly plates are respectively the first assembly plate 1221 and the second assembly plate 1222. The first assembly plate 1221 is adjacent to the middle cover 121, and an assembly space is formed between the first assembly plate 1221 and the middle cover 121. The second assembly plate 1222 is away from the middle cover 121, and an assembly space is formed between the first assembly plate 1221 and the second assembly plate 1222. Preferably, one end of the first assembly plate 1221 protrudes to form a first bearing portion 12211 matching the middle cover 121, and a partition 123 is also correspondingly arranged on the first bearing portion 12211; one end of the second assembly plate 1222 close to the first assembly plate 1221 is provided with a protruding second bearing portion 12221. Of course, the specific shapes of the assembly 122 and the assembly plates are not limited, as long as they can be spliced into a cavity structure for assembling the breaker pole. It should be noted that the use of the split inner shell 12 structure is not limited to plug-in circuit breakers, and the assembly 122 is not limited to the stacking and assembly of two assembly plates in the first direction, and may also be more assembly plates.

[0054] In this embodiment, the operating mechanism 2 and the contact mechanism 3, arc extinguishing system, short-circuit protection mechanism 6, and current transformer 51 in each breaker pole can adopt existing technologies, such as Figure 4 、 7 As shown in FIGS. and 8, the contact mechanism 3 includes a rotating shaft 31, a moving contact 32, and a static contact 34. The rotating shaft 31 is rotatably assembled on the middle cover 121. The operating mechanism 2 can pass through the middle cover 121 and be drivingly connected to the rotating shaft 31. One end of the moving contact 32 is rotatably connected to the rotating shaft 31, and the other end is provided with a moving contact point and rotates between the middle cover 121 and the first assembly plate 1221. The static contact 34 is fixedly arranged on the first assembly plate 1221. The contact mechanisms 3 of two adjacent breaker poles are separated by a partition 123. When it is necessary to obtain the parameters of the contact mechanism 3 or maintain and replace the contact mechanism 3, only the middle cover 121 and the first assembly plate 1221 need to be removed, and the influence on other components is small.

[0055] Such as Figure 4As shown in the figure, the arc extinguishing system includes an arc extinguishing chamber 41 and an exhaust passage. The arc extinguishing chamber 41 is also disposed in the first assembly plate 1221. The incoming arc end of the arc extinguishing chamber 41 corresponds to the moving trajectory of the moving contact 32. The arc extinguishing chambers 41 of adjacent two breaker poles are separated by a partition plate 123. The exhaust passage is located in the second assembly plate 1222, and an exhaust port is provided in the middle of the end of the second assembly plate 1222 away from the middle cover 121. In this embodiment, the second assembly plate 1222 is provided with three exhaust ports arranged side by side in the third direction, and each exhaust port corresponds to and communicates with an air outlet 113 of the housing 11. Both ends of the exhaust passage are respectively connected to the exhaust end of the arc extinguishing chamber 41 and the exhaust port, so that the exhaust gas discharged from the arc extinguishing chamber 41 is cooled and buffered in the exhaust passage. In this embodiment, the second bearing portion 12221 corresponds to the exhaust end of the arc extinguishing chamber 41. The second bearing portion 12221 can block a part of the area of the exhaust end of the arc extinguishing chamber 41, so as to narrow the end of the exhaust passage communicating with the arc extinguishing chamber 41, which is beneficial for the exhaust gas to enter the exhaust passage. Further, at least one deionization member is provided at the exhaust port. When the number of deionization members is two or more, adjacent two deionization members are spaced apart in the first direction, so as to achieve zero arcing.

[0056] As Figure 4 , 8 shown in the figure, the short-circuit protection mechanism 6 is adjacent to the static contact 34 and is jointly disposed on the first assembly plate 1221. In this embodiment, the short-circuit protection mechanism 6 is an electromagnetic release arranged integrally along the first direction, which triggers the operating mechanism 2 to trip in case of a short-circuit fault. The short-circuit protection mechanism 6 includes a second conductive plate 6152, a magnetic yoke 62, an armature 63 and a first bracket 64. The second conductive plate 6152 is arranged along the first direction and passes through the gap between the magnetic yoke 62 and the armature 63. The first bracket 64 is spaced opposite to the second conductive plate 6152. Both ends of the magnetic yoke 62 are bent along the two side edges of the second conductive plate 6152 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 6152, 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 6152, so that the armature 63 moves linearly along the first direction relative to the first bracket 64 and the second conductive plate 6152. 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 moving 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 small occupied space, making the internal structure more compact.

[0057] In this embodiment, the operating mechanism 2 is tripped by the pull rod 65. The pull rod 65 is provided with a trip driving portion 652. Figure 6The middle tripping drive part 652 is a through hole, enabling the tripping drive part 652 to cooperate with a tripping trigger part 211 on the traction rod. A sliding groove 651 is also provided in the middle of the pull rod 65. The sliding groove 651 is a strip-shaped groove, and the length of the sliding groove 651 is equal to the moving stroke of the armature 63. The sliding groove 651 is slidably matched with the sliding part provided on the first bracket 64, thereby restricting the moving stroke of the pull rod 65.

[0058] As Figure 4 , 9 shown, the mutual inductor 51 and the contact mechanism 3 are arranged side by side in the second direction, and the mutual inductor 51 is adjacent to the moving contact 32 in the opening position. The mutual inductor 51 is arranged in the area of the first assembly body 122 close to the middle cover 121, or the mutual inductor 51 is arranged on the first assembly plate 1221. The axis of the central hole of the mutual inductor 51 is parallel to the second direction. A wiring row 53 is arranged in the central hole of the mutual inductor 51. One end of the wiring row 53 is electrically connected to the moving contact 32, and the other end of the wiring row 53 is connected to the first conductive plate 52. Preferably, the connecting body 531 of the wiring row 53 is stuffed in the central hole of the mutual inductor 51. One end of the connecting body 531 is connected to the first conductive plate 52. The wiring pin 532 of the wiring row 53 is located on the side far from the first conductive plate 52 for electrically connecting with the moving contact 32. The first conductive plate 52 is arranged along the first direction for electrically connecting with a wiring terminal 7. In addition, the wiring part 511 of the mutual inductor 51 extends from the edge of the first conductive plate 52 for plugging into the circuit board assembly 81 in the control module, thereby performing signal transmission.

[0059] Preferably, as Figures 4 - 6 shown, in this embodiment, a gap serving as a wiring cavity is left between the inner side wall of the outer shell 11 and the outer side wall of the inner shell 12. The wiring cavity is arranged along the direction parallel to the central axis of the operation hole 111, that is, the wiring cavity is arranged along the first direction, which is convenient for wiring and reduces the complexity of the internal layout.

[0060] In this embodiment, the wiring terminal 7 is arranged in the outer shell 11 outside the inner shell 12, and the wiring terminal 7 corresponds to the wiring socket 112. The wiring terminal 7 can adopt the existing technology, such as Figure 4 , 10 shown. Each wiring terminal 7 includes a terminal component 72 and a conductive row 71. One end of the terminal component 72 has a clamping gap, and the clamping gap of the terminal component 72 corresponds to the wiring socket 112. The conductive row 71 is connected to the terminal component 72. Among a pair of wiring terminals 7, the conductive row 71 of one wiring terminal 7 is used for connecting with the static contact 34, and the conductive row 71 of the other wiring terminal 7 is used for connecting with the moving contact 32. In this embodiment, the conductive row 71 of one wiring terminal 7 is connected to the first conductive plate 52, and the conductive row 71 of the other wiring terminal 7 is connected to the second conductive plate 6152.

[0061] Preferably, as Figure 5 , 6 shown, a gap serving as a wiring cavity is left between the inner side wall of the outer shell 11 and the outer side wall of the inner shell 12. Part of the wiring cavity can communicate with the wiring socket 112. In this embodiment, the wiring terminal 7 is arranged at a position of the wiring cavity close to the wiring socket 112. In this embodiment, the wiring cavity is divided into a first wiring cavity 1161 and a second wiring cavity 1162 according to its position. The first wiring cavity 1161 is located between the inner side of the first side wall 1103 and the outer side wall of the inner shell 12. The space between the first side wall 1103 and the corresponding outer side wall of the inner shell 12 is divided into at least two first wiring cavities 1161 by the partition portion 124 on the inner shell 12. The wiring terminal 7 is correspondingly assembled in the first wiring cavity 1161, and the first conductive plate 52 is arranged in the first wiring cavity 1161 along the first direction. In the same breaker pole, the conductive row 71 of one wiring terminal 7 is connected to the adjacent first conductive plate 52, and the conductive row 71 of the other wiring terminal 7 extends into the inner shell 12 to be connected to the second conductive plate 6152, and the other end of the second conductive plate 6152 is connected to the static contact 34, or directly forms the static contact 34 at the other end of the second conductive plate 6152. The second wiring cavity 1162 can be provided with a wiring board to facilitate limiting and clamping the wires arranged in the second wiring cavity 1162. The second wiring cavity 1162 can be a strip-shaped groove provided on the outer side wall of the inner shell 12.

[0062] An accessory module is further arranged in the outer shell 11. A connection hole for connecting the operating mechanism 2 and the rotating shaft 31 is provided in the middle of the middle cover 121. Accessory slots are provided on both sides of the connection hole. The opening of the accessory slot faces the operating end 1A, and part of the bottom area of the accessory slot can communicate with the inside of the inner shell 12. In this embodiment, the accessory module is a magnetic release 91, as Figure 4 shown, the magnetic release 91 is arranged in an accessory slot, and the reset plate 92 for resetting the magnetic release is arranged on the operating mechanism 2. When the current of the magnetic release reaches the tripping current, the magnetic release 91 triggers the operating mechanism 2 to trip. After troubleshooting, the closing rotation of the operating mechanism 2 drives the reset plate 92 to reset the magnetic release.

[0063] As Figure 1 , 4The control module disposed within the housing 11 may also be disposed in one of the accessory slots. The control module includes a circuit board assembly 81, the circuit board assembly 81 is disposed on the middle cover 121, the circuit board assembly 81 is provided with a display screen 82, and an indicating window 115 is provided on the housing 11 opposite to the display screen 82. In this embodiment, the indicating window 115 is located on one side of the operation hole 111 of the first end cover 1101. Of course, the indicating window 115 may also be opened at a position on the first side wall 1103 or the second side wall close to the first end cover 1101.

[0064] It should be noted that in the description of the present utility model, 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, and is only for the convenience of description, rather than indicating that the device or element referred to must have a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0065] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A circuit breaker, comprising a detachable outer shell (11), one end of the outer shell (11) serving as an operating end (1A) and provided with an operating hole (111), the central axis of the operating hole (111) being parallel to a first direction, an inner shell (12) being provided inside the outer shell (11), an operating mechanism (2) being mounted between the inner shell (12) and the operating hole (111), at least one circuit breaker pole being provided inside the inner shell (12), characterized in that: The inner shell (12) comprises a base and a middle cover (121), the base comprises two assemblies (122), and the two assemblies (122) are assembled in a direction perpendicular to a first direction, at least one of the assemblies (122) is divided into at least two assembly plates, two adjacent assembly plates are stacked and assembled in the first direction, and the middle cover (121) covers one end of the two assemblies (122) close to the operating mechanism (2) in the first direction.

2. The circuit breaker according to claim 1, characterized in that: The circuit breaker pole comprises a contact mechanism (3), the contact mechanism (3) comprising a rotating shaft (31), a moving contact (32) and a stationary contact (34); the rotating shaft (31) is rotatably mounted on the middle cover (121) and is drivingly connected to the operating mechanism (2); the moving contact (32) is connected to the rotating shaft (31) and rotates in the space between the middle cover (121) and an assembly plate adjacent to the middle cover (121); the stationary contact (34) is cooperatively arranged on the assembly plate adjacent to the middle cover (121) and cooperates with the moving contact (32).

3. The circuit breaker according to claim 2, characterized in that: The circuit breaker pole also includes an arc extinguishing system, which includes an arc extinguishing chamber (41). The arc extinguishing chamber (41) and the static contact (34) are located between the same assembly plate and the middle cover (121), and the moving track of the moving contact (32) corresponds to the arc entry end of the arc extinguishing chamber (41).

4. The circuit breaker according to claim 3, characterized in that: The arc extinguishing system further comprises an exhaust channel, which is arranged in a base away from the middle cover (121), one end of the exhaust channel is connected to the exhaust end of the arc extinguishing chamber (41), and the other end of the exhaust channel is connected to an exhaust port arranged on the base.

5. The circuit breaker according to claim 4, characterized in that: The exhaust port is arranged at the middle of an assembly plate away from the middle cover (121), and the exhaust port is provided with at least one free-discharging member.

6. The circuit breaker according to claim 2, characterized in that: The circuit breaker pole also includes a mutual inductor (51) and a short-circuit protection mechanism (6); the short-circuit protection mechanism (6) is adjacent to the static contact (34) and is arranged on the same assembly plate; the mutual inductor (51) is adjacent to the moving contact (32) in the opening position; and the mutual inductor (51) is arranged on an assembly body (122) close to the middle cover (121) or on an assembly plate close to the middle cover (121).

7. The circuit breaker according to claim 1, characterized in that: At least one accessory slot is provided on a side of the middle cover (121) facing the operating end (1A), and an accessory module that cooperates with the operating mechanism (2) is assembled in the accessory slot.

8. The circuit breaker according to claim 1, characterized in that: A control module is also arranged in the housing (11), and the control module comprises a circuit board assembly (81). The circuit board assembly (81) is arranged on a side of the middle cover (121) facing the housing (11), and the circuit board assembly (81) is provided with a display screen (82). The housing (11) opposite to the display screen (82) is provided with an indication window (115).

9. The circuit breaker according to claim 1, characterized in that: The housing (11) comprises a pair of spaced end covers, one of which is used as an operating end (1A) and is provided with a wiring hole, and the other end cover is used as a wiring end (1B) and is provided with a wiring socket (112). Two pairs of side walls are connected between the pair of end covers, and each pair of side walls are spaced and opposed to each other.

10. The circuit breaker according to claim 1, characterized in that: The other end of the housing (11) away from the operating end (1A) is a wiring terminal (1B), the wiring terminal (1B) is provided with a wiring socket (112), each circuit breaker pole is provided with a wiring terminal (7) corresponding to the wiring socket (112), and the wiring terminal (7) is arranged inside the housing (11) outside the inner housing (12).

11. The circuit breaker according to claim 1, characterized in that: A gap serving as a wiring cavity is left between the inner wall of the outer shell (11) and the outer wall of the inner shell (12), and the wiring cavity is arranged in a direction parallel to the central axis of the operating hole (111).

12. The circuit breaker according to claim 1, characterized in that: The invention comprises at least two circuit breaker poles, wherein the inner wall of the inner shell (12) is provided with a partition (123), wherein the partition (123) divides the interior of the inner shell (12) into at least two parallel chambers, and the partition (123) forms a partition (124) on the outer wall of the inner shell (12) corresponding to the partition, wherein the partition (124) is used to divide the space between the outer wall of the inner shell (12) and the inner wall of the outer shell (11) on the same side into at least two wiring chambers.

13. The circuit breaker according to claim 12, characterized in that: Each circuit breaker pole comprises a pair of wiring terminals (7) and a contact mechanism (3) connected between the pair of wiring terminals (7); each wiring terminal (7) comprises a terminal assembly (72) and a conductive bar (71) connected to the terminal assembly (72); the terminal assembly (72) corresponds to a wiring socket (112) provided on the outer shell (11); the conductive bar (71) of one wiring terminal (7) extends into the inner shell (12) and is connected to a stationary contact (34) of the contact mechanism (3); a first conductive plate (52) is connected between the conductive bar (71) of the other wiring terminal (7) and a movable contact (32) in the contact mechanism (3); the first conductive plate (52) is arranged in a wiring cavity.

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