Residual current operated circuit breaker

Abstract

The residual current operated circuit breaker comprises a shell, a residual current module, an L-pole unit and an N-pole unit, the shell is provided with a first cavity and a second cavity, the N-pole unit is installed in the first cavity, and the L-pole unit is installed in the second cavity; the residual current module comprises an electronic component board, a zero-sequence mutual inductor and a residual current action tripper, the residual current action tripper and the electronic component board are respectively arranged in the first cavity, and at least part of the zero-sequence mutual inductor is arranged in the first cavity; the N-pole unit comprises an N-pole moving contact, an N-pole static contact, an N-pole operating mechanism and an N-pole short-circuit protection device, the N-pole operating mechanism is connected with the N-pole moving contact, and the N-pole short-circuit protection device and the residual current action tripper are respectively used for driving the N-pole operating mechanism to unlock and trip. According to the residual current operated circuit breaker, the short-circuit protection device and the operating mechanism are arranged in the first cavity where the N-pole unit is located, so that short-circuit protection is achieved, and the reliability of closed contact of the N-pole contact is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electrical apparatus field, concretely relates to a residual current operating circuit breaker. BACKGROUND

[0002] The existing residual current operating circuit breaker is composed of a current protection pole (also called L pole) and a non-protected neutral pole (also called N pole), and the residual current operating module is placed in the neutral pole, which results in a compact space in the neutral pole and makes it impossible to place the electromagnetic release, arc extinguishing device and independent operating mechanism, thus leading to poor stability of the contact closing contact and lacking short-circuit protection and arc extinguishing function, which affects the service life of the product. SUMMARY

[0003] The utility model aims at overcoming at least one defect of prior art and providing a residual current operating circuit breaker.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The residual current operating circuit breaker comprises a shell, a residual current module, an L pole unit and an N pole unit, the shell is provided with a first chamber and a second chamber, the N pole unit is installed in the first chamber, and the L pole unit is installed in the second chamber; the residual current module comprises an electronic component board, a zero sequence transformer and a residual current operating release, the zero sequence transformer and the residual current operating release are electrically connected with the electronic component board respectively, the residual current operating release and the electronic component board are installed in the first chamber respectively, and the zero sequence transformer is at least partially installed in the first chamber.

[0006] The N pole unit comprises an N pole moving contact, an N pole static contact, an N pole operating mechanism and an N pole short-circuit protection device, the N pole operating mechanism is connected with the N pole moving contact and can drive the N pole moving contact to contact or separate from the N pole static contact, and the N pole short-circuit protection device and the residual current operating release are used for driving the N pole operating mechanism to unlock and release respectively.

[0007] Optionally, the N pole short-circuit protection device comprises a coil former provided with a mounting through cavity, a coil, a static iron core and a moving iron core oppositely arranged in the mounting through cavity of the coil former, a moving iron core spring arranged between the static iron core and the moving iron core and used for driving the moving iron core to reset, and a top rod in synchronous linkage with the moving iron core and used for driving the N pole operating mechanism to unlock and release; the coil former is a square column structure, and the coil is sleeved on the coil former.

[0008] Optionally, the coil is a spiral structure, the spiral center of the spiral structure is arranged along the length direction of the coil former, and the cross section of the spiral center of the spiral structure in the vertical direction is square.

[0009] Optionally, the N-pole operating mechanism comprises a tripping member for unlocking the N-pole operating mechanism, the residual current operating trip is arranged opposite to the tripping member, and the residual current operating trip is configured to drive the tripping member to unlock the N-pole operating mechanism; one end of the ejector rod extends towards the residual current operating trip and is provided with a pushing portion, the tripping member extends and is provided with a tripping member extension end opposite to the pushing portion, and the pushing portion is capable of pushing the tripping member extension end to drive the tripping member to unlock the N-pole operating mechanism.

[0010] Optionally, the ejector rod comprises an ejector rod body, one end of the ejector rod body is connected to the pushing portion, and the other end of the ejector rod body penetrates through the static core and is connected to the moving core.

[0011] Optionally, the moving core comprises a linkage column, the other end of the ejector rod body is provided with a linkage groove matched with the linkage column, and the linkage column is fixedly inserted in the linkage groove.

[0012] Optionally, the ejector rod body is in a columnar structure, and the pushing portion is in a straight plate structure.

[0013] Optionally, the mounting cavity is a square through hole penetrating through the coil framework along the length direction of the coil framework; the moving core comprises a moving core body, the moving core body is in a square block structure matched with the mounting cavity, and the moving core body is slidingly arranged in the mounting cavity; the static core comprises a static core body, the static core body is in a square block structure matched with the mounting cavity, and the static core body is fixedly arranged in the mounting cavity.

[0014] Optionally, the N-pole unit further comprises an N-pole arc extinguishing chamber, and the N-pole arc extinguishing chamber is located at a side of the N-pole moving contact away from the N-pole operating mechanism.

[0015] Optionally, an insulating partition plate is further arranged at a side of the N-pole moving contact, the N-pole static contact and the N-pole arc extinguishing chamber, and an arc blocking rib is protruded on the insulating partition plate and located at a side of the N-pole arc extinguishing chamber away from the N-pole moving contact.

[0016] Optionally, a side of the N-pole arc extinguishing chamber close to the N-pole moving contact is inclined towards a side close to the N-pole static contact.

[0017] Optionally, the electronic component board is located at a side of the N-pole short-circuit protection device away from the residual current operating trip.

[0018] Optionally, the shell is provided with a through hole communicating the first chamber and the second chamber, the axial hole of the zero sequence transformer faces the N-pole short-circuit protection device and the residual current operating trip, a part of the zero sequence transformer is located in the first chamber and at a side of the N-pole short-circuit protection device and the residual current operating trip, and the other part of the zero sequence transformer penetrates through the through hole and extends into the second chamber.

[0019] Optionally, the shell comprises an L-pole cover, a base and an N-pole cover arranged in sequence, wherein the N-pole cover covers one side of the base to form the first chamber, the L-pole cover covers the other side of the base to form the second chamber, and the L-pole cover is provided with a support frame protruding towards the base, and the part of the zero sequence mutual inductor extending into the second chamber is arranged on the support frame.

[0020] Optionally, the L-pole unit comprises an L-pole operating mechanism, and the L-pole operating mechanism and the N-pole operating mechanism each comprise a handle and a linkage structure, the linkage structure comprises a connecting rod, a lever, a lock catch and a jump catch in snap-fit, the lock catch and the jump catch are rotationally arranged on the lever, the connecting rod is connected between the jump catch and the handle, and the moving contact of the L-pole operating mechanism and the N-pole operating mechanism is respectively mounted on the lever or a contact support in driving cooperation with the lever, and when the lock catch and the jump catch are in snap-fit, the handle drives the moving contact to contact or separate from the stationary contact through the linkage structure.

[0021] The residual current operating circuit breaker of the utility model, through setting short-circuit protection device and operating mechanism in the first chamber where N-pole unit is located, not only has short-circuit protection, improves service life of circuit breaker, but also improves reliability of N-pole contact closed contact.

[0022] In addition, the N-pole short-circuit protection device is designed to be small in size, the square columnar coil framework is adopted to increase the volume of the coil framework in a smaller space, so that the volume of the coil outside the coil framework and the stationary iron core and the moving iron core inside the coil framework can be increased to meet the use requirement, the space utilization is improved to reduce the occupied space of the N-pole short-circuit protection device in the first chamber.

[0023] In addition, the square coil is adopted to enable the coil to be arranged between the opposite two side walls of the first chamber, the space utilization is improved to reduce the occupied space of the N-pole short-circuit protection device in the first chamber.

[0024] In addition, the N-pole is provided with an arc extinguishing chamber to improve the arc extinguishing capacity. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the structural schematic view of the N-pole unit and the residual current module of the utility model;

[0026] Figure 2 is the structural schematic view of the L-pole unit of the utility model;

[0027] Figure 3 is the structural schematic view of the circuit breaker of the utility model;

[0028] Figure 4 is the sectional view of the N-pole short-circuit protection device of the utility model;

[0029] Figure 5 is the exploded view of the static iron core, the moving iron core and the ejector rod of the utility model;

[0030] Figure 6 is the structure schematic view of the utility model's release component;

[0031] Figure 7 is the conductive structure schematic view of the utility model's N-pole short circuit protection device;

[0032] Figure 8 is the conductive structure schematic view of the utility model's N-pole short circuit protection device and L-pole short circuit protection device;

[0033] Figure 9 is the structure schematic view of the utility model's Figure 1 insulation partition part;

[0034] Figure 10 is the structure schematic view of the utility model's L-pole arc extinguishing chamber;

[0035] Figure 11 is the structure schematic view of the utility model's N-pole operating mechanism and L-pole operating mechanism;

[0036] Figure 12 is the structure schematic view of the utility model's testing device and first wiring board.

[0037] Test device 100; test button 110; test button body 111; connecting rod 112; driving block 113; limiting column 114; conductive elastic piece 120; first elastic arm 121; torsion spring body 122; second elastic arm 123; conductive part 124; residual current module 200; electronic component board 210; connecting hole 211; zero sequence mutual inductor 220; residual current operating release 230; shell 300; first cavity 301; second cavity 302; L pole cover 310; support frame 311; base 320; perforation 321; N pole cover 330; N pole unit 400; first N pole wiring terminal 410; first wiring board 420; first flexible connection 421; N pole moving contact 440; N pole static contact 450; fixed baffle 451; static contact 452; arc striking angle 453; first wire 454; second wiring board 460; wiring section 461; connecting section 462; second N pole wiring terminal 470; N pole operating mechanism 480; N pole handle 481; release 482; release elongated end 4821; N pole short-circuit protection device 490; coil framework 491; mounting cavity 4911; coil 492; static core 493; static core body 4931; accommodating groove 4932; positioning flange 4933; moving core 494; moving core body 4941; linkage column 4942; moving core spring 495; jacking rod 496; pushing part 4961; jacking rod body 4962; linkage groove 4963; N pole arc-extinguishing chamber 430; L pole unit 500; first L pole wiring terminal 510; third wiring board 520; L pole moving contact 530; L pole static contact 540; L pole arc-extinguishing chamber 550; first arc-extinguishing grid 551; second arc-extinguishing grid 552; fourth wiring board 560; wiring part 561; second wire 562; second L pole wiring terminal 570; L pole operating mechanism 580; L pole handle 581; L pole short-circuit protection device 590; overload protection device 600; linkage piece 700; linkage shaft 800; insulating partition 900; side flange 901; arc blocking rib 902; limiting rib 903; fixing column 910. DETAILED DESCRIPTION

[0038] The following examples, given in conjunction with the accompanying drawings, further illustrate the specific embodiments of the residual current circuit breaker of the present application. The residual current circuit breaker of the present application is not limited to the examples described below.

[0039] As Figures 1-3As shown, the residual current circuit breaker of the embodiment comprises a shell 300, a residual current module 200, an L-pole unit 500 and an N-pole unit 400, the shell 300 is provided with a first chamber 301 and a second chamber 302, the N-pole unit 400 is installed in the first chamber 301, and the L-pole unit 500 is installed in the second chamber 302; the residual current module 200 comprises an electronic component board 210, a zero-sequence transformer 220 and a residual current operating release 230, the zero-sequence transformer 220 and the residual current operating release 230 are electrically connected with the electronic component board 210 respectively, the residual current operating release 230 and the electronic component board 210 are installed in the first chamber 301 respectively, and the zero-sequence transformer 220 is at least partially installed in the first chamber 301. The zero-sequence transformer 220 is entirely installed in the first chamber 301, or the zero-sequence transformer 220 is partially located in the first chamber 301 and partially located in the second chamber 302.

[0040] The N-pole unit 400 of the embodiment comprises an N-pole movable contact 440, an N-pole static contact 450, an N-pole operating mechanism 480 and an N-pole short-circuit protection device 490, the N-pole operating mechanism 480 is connected with the N-pole movable contact 440 and can drive the N-pole movable contact 440 to contact or separate from the N-pole static contact 450, and the N-pole short-circuit protection device 490 and the residual current operating release 230 are respectively used to drive the N-pole operating mechanism 480 to be unlocked and released.

[0041] The residual current circuit breaker of the embodiment can set the electronic component board 210, the residual current operating release 230 and at least part of the zero-sequence transformer 220 in the N-pole, and can also have the short-circuit protection device and the operating mechanism, and the short-circuit protection device and the residual current operating release 230 are both independent release devices, which not only has the short-circuit protection and improves the service life of the circuit breaker, but also improves the reliability of the N-pole contact closing contact.

[0042] As shown in Figure 4 and Figure 5 The N-pole short-circuit protection device 490 of the embodiment comprises a coil frame 491 provided with an installation through cavity 4911, a coil 492 connected in series in a main circuit, a static iron core 493 and a movable iron core 494 oppositely arranged in the installation through cavity 4911 of the coil frame 491, a movable iron core spring 495 arranged between the static iron core 493 and the movable iron core 494 and used to drive the movable iron core to reset, and a top rod 496 synchronously linked with the movable iron core 494 and used to drive the N-pole operating mechanism 480 to be unlocked and released; in particular, the coil frame 491 is a square column structure, and the coil 492 is sleeved on the coil frame 491.

[0043] The miniaturized design of the N-pole short-circuit protection device 490 in this embodiment utilizes a square columnar coil frame 491 to maximize its volume within a smaller space. This allows for an increase in the volume of the coil 492 outside the coil frame 491, as well as the stationary iron core 493 and moving iron core 494 within the coil frame 491, to meet usage requirements and improve space utilization, thereby reducing the space occupied by the N-pole short-circuit protection device 490 within the first chamber 301. Of course, as a modified embodiment, the N-pole short-circuit protection device 490 could also adopt a structure similar to the L-pole short-circuit protection device 590, but this would compress the space occupied by other components within the N-pole unit 400.

[0044] Preferably, the coil 492 has a helical structure, with the helical center located along the length of the coil frame 491, and the cross-section perpendicular to the helical center is square. By using a square coil 492, the coil 492 can be fitted snugly between the opposite side walls of the first chamber 301, improving space utilization and reducing the space occupied by the N-pole short-circuit protection device 490 within the first chamber 301.

[0045] like Figure 1 and Figures 4-6 As shown, the N-pole operating mechanism 480 of this embodiment includes an N-pole handle 481 and a release member 482 for unlocking and tripping the N-pole operating mechanism 480. The residual current operated trip unit 230 is disposed opposite to the release member 482 and is used to drive the release member 482 to unlock and trip the N-pole operating mechanism 480. One end of the push rod 496 of the N-pole short-circuit protection device 490 extends toward the residual current operated trip unit 230 and is provided with a pushing part 4961. The release member 482 extends with a release member extension end 4821 opposite to the pushing part 4961. The pushing part 4961 can push against the release member extension end 4821 to drive the release member 482 to unlock and trip the N-pole operating mechanism 480.

[0046] It should be noted that the technical principle of the N-pole operating mechanism 480 is existing technology. The handle drives the moving contact through a linkage structure, causing the moving contact to contact or separate from the stationary contact to connect or disconnect the main circuit. The linkage structure typically includes a linkage, a lever, a latching lock, and a jump catch. The latch and jump catch are rotatably mounted on the lever. The linkage connects the jump catch and the handle. The moving contact is mounted on the lever or on a contact support that engages with the lever. When the latch and jump catch are engaged, the handle drives the moving contact to contact or separate from the stationary contact through the linkage structure. By pushing the latch to rotate, the latching lock and jump catch are released, allowing the operating mechanism to unlock and disengage, causing the moving contact to separate from the stationary contact, thus achieving tripping protection. This will not be elaborated further here. In this embodiment, the release element 482 is the latch of the N-pole operating mechanism 480.

[0047] The action process of the N pole short circuit protection device 490 of the embodiment is as follows: when a short circuit current occurs in the main circuit, the coil 492 generates an electromagnetic force, the moving iron core 494 moves towards the static iron core 493, the top rod 496 moves with the moving iron core 494, the pushing part 4961 pushes the extended end 4821 of the unlocking part 482, the unlocking part 482 rotates to release the snap buckle cooperation with the snap buckle of the N pole operating mechanism 480, the N pole operating mechanism 480 is unlocked and tripped to drive the N pole moving contact 440 to separate from the N pole static contact 450, and the short circuit protection function is completed. Then, the moving iron core spring 495 releases energy to drive the moving iron core 494 to move away from the static iron core 493, so as to push the moving iron core 494 and the top rod 496 back to the initial position.

[0048] The N pole operating mechanism 480 of the embodiment is the same as the L pole in other parts except the snap buckle (the unlocking part 482), so that the types of parts are reduced, the snap buckle only needs to be extended to the driven part, the change is small, and the implementation is easy.

[0049] Preferably, the mounting cavity 4911 is a square through hole penetrating through the coil skeleton 491 along the length direction of the coil skeleton 491. The moving iron core 494 and the static iron core 493 can be square block structures, which are simple in structure and can increase the volume of the moving and static iron cores as much as possible, so as to realize the miniaturization design of the N pole short circuit protection device 490 while ensuring the electromagnetic performance of the moving and static iron cores.

[0050] As shown in Figure 4 and Figure 5 The moving iron core 494 of the embodiment includes a moving iron core body 4941 which is a square block structure matched with the mounting cavity 4911 and is slidingly arranged in the mounting cavity 4911. A linkage column 4942 is protrusively arranged on one end of the moving iron core body 4941 facing the static iron core 493.

[0051] As shown in Figure 4 and Figure 5 The static iron core 493 of the embodiment includes a static iron core body 4931 which is a square block structure matched with the mounting cavity 4911 and is fixed in the mounting cavity 4911. An accommodating groove 4932 is arranged on one end of the static iron core 493 facing the moving iron core 494. One end of the static iron core body 4931 extends out of the mounting cavity 4911, and the two sides of the one end of the static iron core body 4931 are respectively extended to be provided with positioning flanges 4933 abutting against the coil skeleton 491.

[0052] As shown in Figure 4 and Figure 5As shown, the ejector rod 496 of the embodiment comprises an ejector rod body 4962, one end of which is connected with the pushing part 4961, and the other end of which penetrates through the static iron core 493 and is connected with the moving iron core 494. Preferably, the ejector rod body 4962 is a square column structure, and of course the ejector rod body 4962 can also be circular or other shapes; the pushing part 4961 is a straight plate structure. Further, the other end of the ejector rod body 4962 is provided with a linkage groove 4963 matched with the linkage column 4942, the linkage column 4942 is inserted and fixed in the linkage groove 4963 to realize the synchronous linkage of the ejector rod 496 and the moving iron core 494. The linkage column 4942 and the linkage groove 4963 are preferably square.

[0053] As shown, Figure 4 As shown, the moving iron core spring 495 of the embodiment is preferably a compression spring, which is sleeved on the other end of the ejector rod body 4962, one end of the moving iron core spring 495 is placed in the accommodating groove 4932 of the static iron core 493, and the other end abuts against the moving iron core 494. Of course, the moving iron core spring 495 can also be an elastic member such as a tension spring, a torsion spring, a leaf spring, etc.

[0054] As shown, Figure 1 and Figure 3 As shown, the layout structure of the residual current operating circuit breaker of the embodiment, the L-pole unit 500 and the N-pole unit 400 are arranged in sequence along the first direction; the N-pole unit 400 further comprises a first N-pole terminal 410 and a second N-pole terminal 470, the first N-pole terminal 410, the N-pole moving contact 440, the N-pole static contact 450 and the second N-pole terminal 470 are arranged in sequence along the second direction, the N-pole short-circuit protection device 490 and the residual current operating release 230 are arranged in sequence in the first cavity 301 along the third direction, and the N-pole short-circuit protection device 490 and the residual current operating release 230 are located between the second N-pole terminal 470 and the N-pole static contact 450 in the second direction, the N-pole operating mechanism 480 is obliquely arranged, one end of the N-pole operating mechanism 480 is located on the side of the residual current operating release 230 away from the N-pole short-circuit protection device 490 in the third direction, the other end of the N-pole operating mechanism 480 is located on the side of the residual current operating release 230 away from the second N-pole terminal 470 in the second direction, and the other end of the N-pole operating mechanism 480 is connected with the N-pole moving contact 440. Through the compact structure and reasonable layout in the first cavity 301 where the N-pole unit 400 is located, the N-pole operating mechanism 480 is obliquely arranged above and on the right side of the residual current operating release 230, and above the N-pole moving contact 440, so that there is enough space below the residual current operating release 230 and between the second N-pole terminal 470 and the N-pole static contact 450.

[0055] It should be noted that the first direction, the second direction, and the third direction are perpendicular to each other, with the first direction being... Figure 3 The Z direction is shown, and the second direction is... Figure 1 , Figure 2 and Figure 3 The X direction is shown, and the third direction is... Figure 1 and Figure 2 The Y direction is shown. The first direction is also the width direction of the circuit breaker, the second direction is the length direction of the circuit breaker, and the third direction is the height direction of the circuit breaker.

[0056] like Figure 1 , Figure 3 and Figure 7 As shown, the housing 300 of this embodiment includes an L-type cover 310, a base 320, and an N-type cover 330 arranged sequentially along a first direction. The N-type cover 330 covers one side of the base 320 to form the first chamber 301, and the L-type cover 310 covers the other side of the base 320 to form the second chamber 302. The base 320 of the housing 300 has a through hole 321 connecting the first chamber 301 and the second chamber 302. The L-type cover 310 has a support frame 311 protruding towards the base 320 (i.e., along the first direction). In this embodiment, the N-type cover 330 and the L-type cover 310 share the same base 320. Of course, as in other embodiments, the housing 300 may also include an independent N-type shell for accommodating the N-type unit 400 and an L-type shell for accommodating the L-type unit 500.

[0057] like Figure 1 and Figure 7 As shown, in this embodiment, the zero-sequence current transformer 220 has an axial hole facing the N-pole short-circuit protection device 490 and the residual current trip unit 230, meaning the axial direction of the zero-sequence current transformer 220 is arranged along the second direction. A portion of the zero-sequence current transformer 220 is located in the first chamber 301, and this portion is located on one side of the N-pole short-circuit protection device 490 and the residual current trip unit 230 in the second direction (i.e., between the N-pole short-circuit protection device 490 and the second N-pole terminal 470, and between the residual current trip unit 230 and the second N-pole terminal 470). Another portion of the zero-sequence current transformer 220 passes through the through hole 321 and extends into the second chamber 302. The portion of the zero-sequence current transformer 220 extending into the second chamber 302 is placed on the support frame 311. The zero-sequence current transformer 220 is placed vertically inside the L-pole unit 500 and the N-pole unit 400, which reduces the space occupied in the first chamber 301 where the N-pole unit 400 is located, and makes it easier to add other functional modules to the N-pole unit 400 to improve its performance.

[0058] like Figure 1As shown, the electronic component board 210 of this embodiment is located on the side of the N-pole short-circuit protection device 490 away from the residual current operated trip unit 230. Specifically, the electronic component board 210 is disposed in the first chamber 301 along the second direction, and between the first N-pole terminal 410 and the zero-sequence current transformer 220. One end of the electronic component board 210 is located on one side of the N-pole moving contact 440 and the N-pole stationary contact 450 in the first direction, and the other end of the electronic component board 210 is located on the side of the N-pole short-circuit protection device 490 away from the residual current operated trip unit 230. The electronic component board 210 is horizontally positioned between the first N-pole terminal 410 and the zero-sequence current transformer 220, and below the N-pole short-circuit protection device 490, so that the N-pole moving contact 440 and the N-pole stationary contact 450 can be stacked with the electronic component board 210 at intervals, which is a reasonable arrangement that does not interfere with the arrangement of other structures in the N-pole, and also facilitates wiring between the zero-sequence current transformer 220 and the residual current trip unit 230.

[0059] In this embodiment, the residual current circuit breaker has a residual current module 200 arranged in the L-pole unit 500 and the N-pole unit 400. The zero-sequence current transformer 220 occupies part of the space in the L-pole unit 500. The residual current trip unit 230, the electronic component board 210 and the testing device are located in the N-pole unit 400. The entire residual current circuit breaker has a size of 36mm in the first direction, which only requires the space of two modules. One module is about 18mm, so the width of the residual current circuit breaker is 36mm.

[0060] like Figure 1 As shown, the conductive structure between the first N-pole terminal 410 and the N-pole moving contact 440 in this embodiment is as follows: the first N-pole terminal 410 is electrically connected to the N-pole moving contact 440 through the first conductive structure. The first conductive structure includes a first terminal block 420 and a first flexible connection 421. One end of the first terminal block 420 is inserted into the first N-pole terminal 410 and cooperates with the first N-pole terminal 410 for external connection. The two ends of the first flexible connection 421 are respectively welded to the other end of the first terminal block 420 and the N-pole moving contact 440.

[0061] like Figure 1 , Figure 7 and Figure 8As shown, the conductive structure between the second N-pole terminal 470 and the N-pole static contact 450 of the embodiment, the N-pole short-circuit protection device 490 is electrically connected between the second N-pole terminal 470 and the N-pole static contact 450, the second N-pole terminal 470 is electrically connected with the N-pole short-circuit protection device 490 through a second conductive structure, and the second conductive structure passes through the axial hole of the zero sequence transformer 220. For example, the second conductive structure is a second wiring board 460, which includes a connecting segment 462 and a wiring segment 461 connected in sequence in the second direction, the wiring segment 461 is inserted into the second N-pole terminal 470 and cooperates with the second N-pole terminal 470 to be externally connected, the connecting segment 462 passes through the axial hole of the zero sequence transformer 220 and is located on the side of the N-pole short-circuit protection device 490 away from the residual current operating trip device 230 in the third direction, and the connecting segment 462 is electrically connected with the coil 492 of the N-pole short-circuit protection device 490. The electrical connection between the connecting segment 462 and the coil 492 can be achieved by welding. The structure of the second wiring board 460 is optimized, the connecting segment 462 passes through the axial hole of the zero sequence transformer 220 and is electrically connected on one side of the N-pole short-circuit protection device 490, which simplifies the structure and reduces the occupied space.

[0062] Specifically, the wiring segment 461 is preferably a straight structure arranged in the second direction; the connecting segment 462 is preferably a bent structure composed of three segments connected in sequence perpendicularly, one segment of the connecting segment 462 connected with the wiring segment 461 is arranged in the second direction, the middle segment of the connecting segment 462 is arranged in the third direction, and the other segment of the connecting segment 462 is arranged in the second direction.

[0063] As shown in Figure 1 and Figure 9 As shown, the N-pole unit 400 of the embodiment further includes an N-pole arc-extinguishing chamber 430, which is located on the side of the N-pole moving contact 440 away from the N-pole operating mechanism 480 in the third direction. The N-pole is provided with an arc-extinguishing chamber, which improves the arc-extinguishing capability. In addition, the N-pole arc-extinguishing chamber 430 is also located between the first N-pole terminal 410 and the N-pole static contact 450 in the second direction. The arc-extinguishing chamber is reasonably arranged between the first N-pole terminal 410 and the N-pole static contact 450 and below the N-pole moving contact 440, so that the structure inside the N-pole is compact.

[0064] Preferably, the side of the N-pole arc-extinguishing chamber 430 close to the N-pole moving contact 440 is inclined to the direction away from the first N-pole terminal 410 and close to the N-pole static contact 450. The arc-extinguishing chamber 430 is inclined to the moving and static contact contact position of the N-pole, which facilitates the arc to enter the N-pole arc-extinguishing chamber 430 better and improves the arc-extinguishing effect of the N-pole.

[0065] As shown in Figure 1 and Figure 9As shown, the residual current circuit breaker of the embodiment further comprises an insulating partition plate 900, which is located on one side of the N-pole moving contact 440, the N-pole static contact 450 and the N-pole arc extinguishing chamber 430 in the first direction, i.e. the electronic component board 210 is located on one side of the insulating partition plate 900 in the first direction, and the N-pole moving contact 440, the N-pole static contact 450 and the N-pole arc extinguishing chamber 430 are located on the other side of the insulating partition plate 900 in the first direction, so that the insulating partition plate 900 is interposed between the N-pole moving contact 440 and the electronic component board 210, between the N-pole static contact 450 and the electronic component board 210, and between the N-pole arc extinguishing chamber 430 and the electronic component board 210. Part of the electronic component board 210 is not shown and is shielded by the insulating partition plate 900. The insulating partition plate 900 is provided with an arc blocking rib 902 protruding therefrom, which is located on the side of the N-pole arc extinguishing chamber 430 away from the N-pole moving contact 440. The arc blocking rib 902 is provided to block the splashing of the arc.

[0066] In the embodiment, the N-pole arc extinguishing chamber 430 is directly placed on the insulating partition plate 900, and the insulating partition plate 900 is provided with at least one limiting rib 903 protruding therefrom for limiting the N-pole arc extinguishing chamber 430. The N-pole moving contact 440, the N-pole static contact 450 and the N-pole arc extinguishing chamber 430 are stacked on one side of the insulating partition plate 900, respectively. The insulating partition plate 900 not only plays an electrical isolation role to separate the N-pole moving contact 440, the N-pole static contact 450 and other elements such as the electronic component board 210, thereby improving safety, but also plays a supporting and limiting role for the N-pole arc extinguishing chamber 430.

[0067] For example, the insulating partition plate 900 is provided with two limiting ribs 903 protruding therefrom. One limiting rib 903 is a straight structure and is located on the side of the N-pole arc extinguishing chamber 430 close to the N-pole moving contact 440. The other limiting rib 903 is a U-shaped structure with an opening facing the N-pole arc extinguishing chamber 430 and away from the limiting rib 903, and is located on the side of the N-pole arc extinguishing chamber 430 away from the N-pole moving contact 440.

[0068] Further, a side flange 901 protruding from one side of the insulating partition plate 900 facing the N-pole moving contact 440, the N-pole static contact 450 and the N-pole arc extinguishing chamber 430 is provided to improve the isolation and protection effect. A supporting leg protruding from the other side of the insulating partition plate 900 is provided to support the base 320.

[0069] As Figure 7 and Figure 8As shown, the N-pole stationary contact 450 in this embodiment includes a fixed protective plate 451. A stationary contact point 452 is provided on the side of the fixed protective plate 451 facing the N-pole moving contact 440, which contacts the N-pole moving contact 440. The fixed protective plate 451 extends towards the N-pole arc-extinguishing chamber 430 and is provided with an arc-inducing angle 453, meaning the N-pole arc-extinguishing chamber 430 is located between the arc-inducing angle 453 of the N-pole stationary contact 450 and the first N-pole terminal 410. The fixed protective plate 451 is electrically connected to the N-pole short-circuit protection device 490 via a first wire 454. One end of the first wire 454 is welded to the side of the fixed protective plate 451 facing away from the N-pole moving contact 440, and the other end of the first wire 454 is welded to one end of the coil 492 of the N-pole short-circuit protection device 490.

[0070] like Figure 2 As shown, the L-pole unit 500 in this embodiment includes a first L-pole terminal 510, an L-pole moving contact 530, an L-pole stationary contact 540, an L-pole arc-extinguishing chamber 550, a second L-pole terminal 570, and an L-pole short-circuit protection device 590. The first L-pole terminal 510, the L-pole moving contact 530, the L-pole stationary contact 540, the L-pole arc-extinguishing chamber 550, the portion of the zero-sequence current transformer 220 extending into the second chamber 302, and the second L-pole terminal 570 are arranged sequentially along a second direction. The L-pole arc-extinguishing chamber 550 and the L-pole short-circuit protection device 590 are also arranged sequentially along a third direction.

[0071] like Figure 2 As shown, the first L-pole terminal 510 is electrically connected to the L-pole moving contact 530. Exemplarily, the L-pole unit 500 also includes an overload protection device 600, which is a bimetallic strip. The overload protection device 600 is located between the first L-pole terminal 510 and the L-pole moving contact 530. The overload protection device 600 is electrically connected to the first L-pole terminal 510 via a third terminal block 520. One end of the third terminal block 520 is inserted into the first L-pole terminal 510 and cooperates with the first L-pole terminal 510 for external connection. The other end of the third terminal block 520 is soldered to the overload protection device 600. The overload protection device 600 is electrically connected to the L-pole moving contact 530 via a second flexible connection, with both ends of the second flexible connection soldered to the overload protection device 600 and the L-pole moving contact 530, respectively.

[0072] like Figure 2 and Figure 8As shown, the conductive structure between the second L-pole terminal 570 and the L-pole short-circuit protection device 590 in the embodiment is electrically connected through a third conductive structure which passes through the axial hole of the zero-sequence transformer 220. Specifically, the third conductive structure includes a fourth terminal plate 560 and a second wire 562. One end of the fourth terminal plate 560 is inserted into the second L-pole terminal 570 and cooperates with the second L-pole terminal 570 for external connection. The other end of the fourth terminal plate 560 extends in the first direction and is provided with a terminal portion 561 which is located between the zero-sequence transformer 220 and the second N-pole terminal 470. One end of the second wire 562 is connected to the terminal portion 561 and the other end of the second wire 562 passes through the axial hole of the zero-sequence transformer 220 and is electrically connected to the L-pole short-circuit protection device 590. The terminal portion 561 of the fourth terminal plate 560 which extends to the side of the zero-sequence transformer 220 and the second wire 562 which is easy to arrange optimize the conductive structure between the second L-pole terminal 570 and the L-pole short-circuit protection device 590 and reduce the occupied space.

[0073] As shown in Figure 2 and Figure 10 The side of the L-pole arc-extinguishing chamber 550 which faces the second L-pole terminal 570 is designed as a stepped structure. The stepped structure forms a gap between the second L-pole terminal 570 and the L-pole arc-extinguishing chamber 550 to accommodate the zero-sequence transformer 220. Specifically, the L-pole arc-extinguishing chamber 550 includes a plurality of first arc-extinguishing fins 551 and a plurality of second arc-extinguishing fins 552. The first arc-extinguishing fins 551 and the second arc-extinguishing fins 552 are arranged in the third direction and the second arc-extinguishing fins 552 are shorter than the first arc-extinguishing fins 551 to form the stepped structure. The side of the L-pole arc-extinguishing chamber 550 is designed as a stepped structure to ensure the arc-extinguishing capability of the L-pole arc-extinguishing chamber 550 and provide space for the zero-sequence transformer 220.

[0074] As shown in Figure 2 and Figure 11As shown, the L-pole unit 500 further comprises an L-pole operating mechanism 580, which is obliquely arranged, one end of the L-pole operating mechanism 580 is located on the side of the L-pole short-circuit protection device 590 away from the L-pole arc-extinguishing chamber 550 in the third direction, the other end of the L-pole operating mechanism 580 is connected with the L-pole movable contact 530, and the L-pole operating mechanism 580 can drive the L-pole movable contact 530 to contact or separate from the L-pole stationary contact 540. One end of the L-pole operating mechanism 580 is provided with an L-pole handle 581, and the L-pole handle 581 and the N-pole handle 481 are synchronously linked through a linkage 700, both ends of the linkage 700 are connected with the L-pole handle 581 and the N-pole handle 481 respectively. The handles of the operating mechanisms of the two poles are assembled with the linkage 700 to realize synchronous closing and opening operation.

[0075] It should be noted that the technical principle of the L-pole operating mechanism 580 is prior art, the handle drives the movable contact through a connecting rod structure to make the movable contact contact or separate from the stationary contact to turn on or turn off the main circuit. The connecting rod structure usually comprises a connecting rod, a lever, a lock catch and a trip catch which are snap-fitted, the lock catch and the trip catch are rotationally arranged on the lever, the connecting rod is connected between the trip catch and the handle, the movable contact is installed on the lever or a contact support which is drivingly matched with the lever, when the lock catch and the trip catch are snap-fitted, the handle drives the movable contact to contact or separate from the stationary contact through the connecting rod structure, the lock catch is pushed to rotate to release the snap-fitting of the lock catch and the trip catch, so that the operating mechanism is unlocked and tripped to drive the movable contact to separate from the stationary contact to realize tripping protection, which will not be described here. The lock catches of the N-pole operating mechanism 480 and the L-pole operating mechanism 580 are linked through a linkage shaft 800 to realize synchronous unlocking and tripping.

[0076] As shown in Figure 1 and Figure 12 The residual current module 200 of the embodiment further comprises a test device 100, which comprises a test circuit and a test button 110, and pressing the test button 110 can turn on the test circuit to simulate generation of residual current for detecting whether the residual current protection function is normal.

[0077] It should be noted that the working principle of the residual current circuit breaker protection is prior art, when the residual current in the main circuit reaches a predetermined threshold value detected by the zero sequence transformer 220, the electronic component board 210 controls the residual current operating tripping device 230 to perform tripping action to turn off the main circuit to realize circuit breaking protection; the electronic component board 210 usually takes power from the main circuit, and the electronic component board 210 at least comprises part of the test circuit for simulating generation of residual current, which will not be described here.

[0078] As shown in Figure 1 and Figure 12As shown, the test device of the embodiment includes a test button 110 and a conductive elastic member 120, the test button 110 is slidingly arranged on the housing 300 at a side of the N-pole operating mechanism 480 away from the residual current operating trip device 230, and the test button 110 is movable between an initial position and a test position, when the test button 110 moves from the initial position to the test position, the conductive elastic member 120 is driven to connect the electronic component board 210 and the first N-pole terminal 410 in conduction, the electronic component board 210 is powered by contacting the first wiring board 420 in the main circuit through the conductive elastic member 120; the conductive elastic member 120 is used to drive the test button 110 to reset from the test position to the initial position.

[0079] Specifically, the conductive elastic member 120 is located at a side of the electronic component board 210 close to the L-pole unit 500 and away from the insulating partition plate 900, the conductive elastic member 120 includes a conductive part 124 and a first elastic arm 121, the conductive part 124 is directly electrically connected with the electronic component board 210, the first elastic arm 121 is arranged in spaced relation with the first wiring board 420, the test button 110 is drivingly matched with the first elastic arm 121, when the test button 110 moves from the initial position to the test position, the first elastic arm 121 is driven to contact the first wiring board 420, the electronic component board 210 is powered by contacting the first wiring board 420 in the main circuit through the conductive elastic member 120 of the test device 100; the first elastic arm 121 is used to drive the test button 110 to reset from the test position to the initial position.

[0080] When the test button 110 is pressed, i.e. the test button 110 moves from the initial position to the test position, the test button 110 drives the first elastic arm 121 of the conductive elastic member 120 to contact the first wiring board 420 to connect the test circuit of the electronic component board 210 in conduction, generates a simulated residual current, so that the electronic component board 210 controls the residual current operating trip device 230 to perform a tripping action, and completes the residual current operating test; when the test button 110 is released, the first elastic arm 121 returns to be separated from the first wiring board 420, and at the same time, the first elastic arm 121 drives the test button 110 to reset from the test position to the initial position.

[0081] The test device 100 of the embodiment, the conductive elastic member 120 serves as both a conductive member between the electronic component board 210 and the first wiring board 420 and a reset member of the test button 110, reduces parts and simplifies structure to reduce the occupied space, and the conductive elastic member 120 is directly electrically connected with the electronic component board 210, and the electronic component board 210 is powered by contacting the first wiring board 420 in the main circuit, reduces the conductive connection point, and improves the reliability of the residual current operating test function.

[0082] AsFigure 12 As shown, the test button 110 in this embodiment includes a test button body 111, which is slidably disposed within a sliding hole in the housing 300. A connecting rod 112 extends from the test button body 111 along its sliding direction, and a driving block 113 for driving the first elastic arm 121 is provided at the end of the connecting rod 112. The slender connecting rod 112 of the test button 110 extends from the side of the N-pole operating mechanism 480 away from the residual current trip unit 230, substantially close to the side wall of the housing 300, to below the N-pole operating mechanism 480, near the N-pole moving contact 440. The test button 110 is designed with a slender structure, allowing it to be placed in a narrow space, facilitating a more rational and compact layout of other structures within the pole where the test device 100 is located.

[0083] Furthermore, the drive block 113 of the test button 110 is provided with two spaced-apart limiting posts 114, forming a limiting gap between the two limiting posts 114 that corresponds to the first elastic arm 121. When the drive block 113 acts on the first elastic arm 121, the first elastic arm 121 is limited within the limiting gap, making the cooperation between the test button 110 and the first elastic arm 121 more reliable.

[0084] like Figure 12 As shown, the conductive elastic element 120 in this embodiment is a torsion spring, including a torsion spring body 122. The torsion spring body 122 is located on the side of the electronic component board 210 away from the insulating partition 900. A protruding fixing post 910 is provided on the portion of the insulating partition 900 protruding from the electronic component board 210. The torsion spring body 122 is fitted onto the fixing post 910. The two ends of the torsion spring body 122 extend to form a first elastic arm 121 and a second elastic arm 123, respectively. The first elastic arm 121 is located between the test button 110 and the first wiring board 420. The second elastic arm 123 is located on one side of the electronic component board 210 and extends towards the electronic component board 210 to form the conductive portion 124. The conductive elastic element 120 has a simple structure, is easy to manufacture, and can be compactly arranged with the test button 110, the first wiring board 420, and the electronic component board 210, reducing space occupation. Of course, the conductive elastic element 120 can also be a spring sheet or other elastic structures.

[0085] Preferably, the conductive portion 124 of the conductive elastic element 120 is electrically connected to the electronic component board 210 in a rigid fixed manner. The electronic component board 210 is provided with a connection hole 211, and the conductive portion 124 is inserted and fixed in the connection hole 211 to achieve electrical connection with the electronic component board 210. Of course, the conductive portion 124 and the electronic component board 210 can also be soldered together.

[0086] The residual current operating trip device 230 and the L pole short circuit protection device 590 of the embodiment are all prior arts, when the residual current or short circuit current appears in the main circuit, the top rod of the residual current operating trip device 230 or the L pole short circuit protection device 590 pushes the lock catch to rotate, so that the operating mechanism is unlocked and tripped, and the circuit breaker is protected, which will not be repeated here.

[0087] It should be noted that, in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when used, and are only for the convenience of description, and do not indicate that the device or element referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0088] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be regarded as falling within the protection scope of the present application.

Claims

1. A residual current circuit breaker, comprising a housing (300), a residual current module (200), an L-pole unit (500) and an N-pole unit (400), the housing (300) is provided with a first chamber (301) and a second chamber (302), the N-pole unit (400) is installed in the first chamber (301), and the L-pole unit (500) is installed in the second chamber (302); the residual current module (200) comprises an electronic component board (210), a zero sequence transformer (220) and a residual current operating release (230), the zero sequence transformer (220) and the residual current operating release (230) are electrically connected with the electronic component board (210) respectively, the residual current operating release (230) and the electronic component board (210) are installed in the first chamber (301) respectively, and the zero sequence transformer (220) is at least partially installed in the first chamber (301). characterized in that The N-pole unit (400) comprises an N-pole moving contact (440), an N-pole static contact (450), an N-pole operating mechanism (480) and an N-pole short-circuit protection device (490), the N-pole operating mechanism (480) is connected with the N-pole moving contact (440) and can drive the N-pole moving contact (440) to contact or separate from the N-pole static contact (450), and the N-pole short-circuit protection device (490) and the residual current operating release (230) are respectively used for driving the N-pole operating mechanism (480) to be unlocked and released.

2. The residual current operated circuit breaker according to claim 1, characterized in that: The N-pole short-circuit protection device (490) comprises a coil former (491) provided with a mounting through cavity (4911), a coil (492), a static iron core (493) and a moving iron core (494) oppositely arranged in the mounting through cavity (4911) of the coil former (491), a moving iron core spring (495) arranged between the static iron core (493) and the moving iron core (494) and used for driving the moving iron core to reset, and a top rod (496) in synchronous linkage with the moving iron core (494) and used for driving the N-pole operating mechanism (480) to be unlocked and released; the coil former (491) is a square column structure, and the coil (492) is sleeved on the coil former (491).

3. The residual current operated circuit breaker according to claim 2, characterized in that: The coil (492) is a spiral structure, a spiral center of the spiral structure is arranged along a length direction of the coil former (491), and a cross section of the spiral center in a vertical direction is square.

4. The residual current operated circuit breaker according to claim 2, characterized in that: The N-pole operating mechanism (480) comprises a tripping member (482) for unlocking and tripping the N-pole operating mechanism (480), the residual current operating trip (230) is arranged opposite to the tripping member (482) and is used to drive the tripping member (482) to unlock and trip the N-pole operating mechanism (480); one end of the ejector rod (496) extends in the direction of the residual current operating trip (230) and is provided with a pushing part (4961), the tripping member (482) is provided with a tripping member elongated end (4821) opposite to the pushing part (4961), and the pushing part (4961) can push the tripping member elongated end (4821) to drive the tripping member (482) to unlock and trip the N-pole operating mechanism (480).

5. The residual current operated circuit breaker according to claim 4, characterized in that: The ejector rod (496) comprises an ejector rod body (4962), one end of the ejector rod body (4962) is connected with the pushing part (4961), and the other end of the ejector rod body (4962) penetrates through the static core (493) and is connected with the moving core (494).

6. The residual current operated circuit breaker according to claim 5, characterized in that: The moving core (494) comprises a linkage column (4942), the other end of the ejector rod body (4962) is provided with a linkage groove (4963) matched with the linkage column (4942), and the linkage column (4942) is fixedly arranged in the linkage groove (4963).

7. The residual current circuit breaker according to claim 5, characterized in that: The ejector rod body (4962) is in a columnar structure, and the pushing part (4961) is in a straight plate structure.

8. The residual current circuit breaker according to claim 2, characterized in that: The mounting cavity (4911) is a square through hole penetrating through the coil framework (491) along the length direction of the coil framework (491); the moving core (494) comprises a moving core body (4941) in a square block structure matched with the mounting cavity (4911), and the moving core body (4941) is slidingly arranged in the mounting cavity (4911); the static core (493) comprises a static core body (4931) in a square block structure matched with the mounting cavity (4911), and the static core body (4931) is fixedly arranged in the mounting cavity (4911).

9. The residual current circuit breaker according to claim 1, characterized in that: The N-pole unit (400) further comprises an N-pole arc-extinguishing chamber (430), and the N-pole arc-extinguishing chamber (430) is located on the side, away from the N-pole operating mechanism (480), of the N-pole moving contact (440).

10. The residual current operated circuit breaker according to claim 9, characterized in that: Further comprising an insulating partition plate (900), the insulating partition plate (900) is located on one side of the N-pole moving contact (440), the N-pole static contact (450) and the N-pole arc-extinguishing chamber (430), and a arc-blocking rib (902) is protrusively arranged on the insulating partition plate (900) and located on the side, away from the N-pole moving contact (440), of the N-pole arc-extinguishing chamber (430).

11. The residual current circuit breaker according to claim 9, characterized in that: The side, close to the N-pole moving contact (440), of the N-pole arc-extinguishing chamber (430) is inclined to the side close to the N-pole static contact (450).

12. The residual current circuit breaker according to claim 1, characterized in that: The electronic component board (210) is located on the side, away from the residual current operating trip (230), of the N-pole short-circuit protection device (490).

13. The residual current circuit breaker according to claim 1, characterized in that: The shell (300) is provided with a through hole (321) for communication between the first chamber (301) and the second chamber (302), the axial hole of the zero sequence mutual inductor (220) faces the N-pole short-circuit protection device (490) and the residual current operating trip device (230), a part of the zero sequence mutual inductor (220) is located in the first chamber (301), and the N-pole short-circuit protection device (490) and the residual current operating trip device (230) are located on one side of the zero sequence mutual inductor (220), another part of the zero sequence mutual inductor (220) extends into the second chamber (302) through the through hole (321).

14. The residual current circuit breaker according to claim 13, characterized in that: The shell (300) comprises an L-pole cover (310), a base (320) and an N-pole cover (330) arranged in sequence, wherein the N-pole cover (330) covers one side of the base (320) to form the first chamber (301), the L-pole cover (310) covers the other side of the base (320) to form the second chamber (302), and the L-pole cover (310) is provided with a support frame (311) protruding towards the base (320), and the part of the zero sequence mutual inductor (220) extending into the second chamber (302) is arranged on the support frame (311).

15. The residual current circuit breaker according to claim 1, characterized in that: The L-pole unit (500) comprises an L-pole operating mechanism (580), the L-pole operating mechanism (580) and the N-pole operating mechanism (480) each comprise a handle and a linkage structure, the linkage structure comprises a linkage, a lever, a snap-fit lock catch and a jump catch, the lock catch and the jump catch are rotationally arranged on the lever, and the linkage is connected between the jump catch and the handle, the moving contact of the L-pole operating mechanism (580) and the N-pole operating mechanism (480) is respectively mounted on the lever or a contact support drivingly connected with the lever, and when the lock catch and the jump catch are snap-fit, the handle drives the moving contact to contact or separate from the stationary contact through the linkage structure.

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