Residual current operated circuit breaker

Abstract

The application discloses a residual current circuit breaker, which comprises a base and a cover plate, the base is provided with a concave cavity on one side, and an electric leakage protection module comprises a zero sequence transformer and a tripping mechanism, the tripping mechanism comprises a tripping coil, the zero sequence transformer comprises a magnetic ring and a secondary winding, and the magnetic ring is matched with a first wire and a second wire which are threaded through, the tripping coil comprises a coil framework and a coil winding, a circuit board is connected between the secondary winding and the tripping coil, the first wire and the second wire are wound on the zero sequence transformer and threaded through the inner hole of the zero sequence transformer at least twice, a plurality of discrete components for realizing filtering of a transformer output signal and switching devices are arranged on the circuit board, and the secondary winding and the tripping coil are electrically connected through the plurality of discrete components. The application is convenient to install, and can simplify the structure of an existing product, reduce the weight and production cost of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to a residual current circuit breaker. BACKGROUND

[0002] The residual current circuit breaker is a circuit breaker with leakage protection function, the shell of which is generally composed of a base and a cover plate, the base is provided with recesses on both sides, the cover plate can close the recesses, and the two recesses respectively accommodate a leakage protection module and a circuit breaker module, the leakage protection module includes internal components such as a zero sequence transformer, a tripping mechanism, a circuit board, movable and static contacts, an arc extinguishing chamber, etc., some of the internal components such as a tension spring, a movable contact, a connecting rod, a swing rod, etc. need to be positioned or rotationally connected through a shaft, one end of the shaft is inserted and fixed on the base, and the other end is inserted and fixed on a fixed plate connected with the base, the inner side of the cover plate is usually provided with some structure features cooperating with the internal components to realize positioning and limiting function, the outer side of the fixed plate is provided with a positioning structure cooperating with the cover plate, the zero sequence transformer includes a magnetic ring and a secondary winding wound on the magnetic ring, the tripping mechanism includes a tripping coil, the secondary winding and the tripping coil are respectively electrically connected with the circuit board, the circuit board is usually provided with elements such as an integrated block, a switching element, etc., and the integrated block is internally provided with signal amplification circuit, output control and various signal processing circuits, when residual current occurs in the circuit, the secondary winding of the zero sequence transformer senses the potential, after amplification by the signal amplification circuit, the switching element on the circuit board can be driven to move the tripping mechanism, so as to achieve the purpose of cutting off the circuit. The residual current circuit breaker usually further includes a test device for detecting whether the residual current action function is perfect, the test device usually includes a test button for hand pressing operation, and a movable contact and a static contact driven by the test button to open and close, the movable contact and the static contact are electrically connected with the circuit board.

[0003] The residual current circuit breaker in the prior art has the following defects:

[0004] (1) The production or purchase cost of the circuit board is high, and the volume is large, which occupies a large internal space of the shell, is not conducive to the miniaturization and compactness of the overall structure of the product, and the sensitivity and reliability are poor;

[0005] (2) The tripping coil and the circuit board are independent of each other, and need to be installed separately during assembly, and the tripping coil and the circuit board also need to be electrically connected through wires, which not only occupies a large internal space of the shell, but also is prone to shaking, which is not conducive to the assembly of the base and the cover plate;

[0006] (3) The spring in the tripping coil lacks effective positioning structure, and is easy to fall out during the closing process of the cover plate, which is not convenient for assembly;

[0007] (4) the other end of the shaft needs to be fixed through a fixing plate, and the fixing plate brings problems of increasing the overall volume, weight, cost and production procedures of the product;

[0008] (5) the moving contact and the static contact of the test device are easy to contact with the circuit board during use, which causes short circuit and affects the test function. SUMMARY

[0009] In view of the deficiencies of the prior art, the application provides a residual current circuit breaker with higher sensitivity, more convenient assembly, higher reliability, more compact volume and lower cost.

[0010] To achieve the above object, the application provides a residual current circuit breaker, comprising a base and a cover plate, the base is provided with a concave cavity for accommodating a leakage protection module, the cover plate is used for cooperating with the concave cavity to be closed, the leakage protection module comprises a zero sequence transformer and a tripping mechanism, the tripping mechanism comprises a tripping coil, the zero sequence transformer comprises a magnetic ring and a secondary winding wound on the magnetic ring, and first and second wires for carrying current of L phase and N phase are further provided for penetrating the magnetic ring, the tripping coil comprises a coil skeleton and a coil winding wound on the coil skeleton, a circuit board is connected between the secondary winding and the tripping coil, the first and second wires are wound on the zero sequence transformer and penetrate the inner hole of the zero sequence transformer at least twice, a plurality of discrete components for realizing filtering of the output signal of the transformer and switching devices are arranged on the circuit board, and the secondary winding and the tripping coil are electrically connected through the plurality of discrete components.

[0011] The application has the following beneficial effects: since the first and second wires are wound on the zero sequence transformer and penetrate the inner hole of the zero sequence transformer at least twice, the induced potential of the secondary winding can be improved, thereby improving the sensitivity, the secondary winding and the tripping coil are electrically connected through the circuit board provided with the discrete components for realizing filtering of the output signal of the transformer and the switching devices, the integrated block does not need to be arranged on the circuit board, and the signal amplification circuit on the integrated block does not need to be used, so that the cost can be effectively reduced, the volume of the circuit board can be reduced, and the overall structure is more compact.

[0012] Further, a positioning mechanism for cooperating with the zero sequence transformer is arranged in the concave cavity, the positioning mechanism comprises a plurality of positioning baffles integrally formed on the inner wall of the concave cavity, the plurality of positioning baffles are distributed in a circumferential direction and are used for cooperating with the zero sequence transformer to be inserted and positioned.

[0013] The further arrangement has the advantages that the positioning mechanism can be used to cooperate with the zero sequence transformer to reduce the shaking of the zero sequence transformer and make the zero sequence transformer work more stably.

[0014] Further, the positioning baffle is at least two, and a gap for accommodating the winding position of the first conductor and / or the second conductor is formed between at least two positioning baffles, and the positioning baffle has an arc side wall cooperating with the circumferential wall of the zero sequence transformer.

[0015] The further arrangement has the advantages that the gap can be used to accommodate the winding position of the first conductor and / or the second conductor, especially for two or more than two times of winding, so as to prevent the winding of the first conductor and the second conductor from interfering with the assembly of the zero sequence transformer, improve the positioning cooperation effect between the positioning baffle and the zero sequence transformer, and the arc side wall can cooperate with the circumferential wall of the zero sequence transformer to limit the position, increase the contact area between the positioning baffle and the zero sequence transformer, so as to make the internal structure of the product more compact and further improve the stability of the zero sequence transformer during assembly.

[0016] Further, the coil former comprises two parallel plates parallel to each other, a connecting column connecting the two parallel plates, a clamping structure provided between the parallel plate and the circuit board, metal pins provided on the two parallel plates and capable of connecting the two ends of the coil winding, and a welding hole provided on the circuit board and capable of electrically connecting the metal pins.

[0017] The further arrangement has the advantages that the clamping structure and the metal pins can reliably connect the parallel plate and the circuit board of the coil former, the metal pins inserted in the welding hole are welded to the welding hole after the tripping coil is reliably fixed, so as to realize reliable electrical connection and reduce the wiring process and improve the assembly efficiency.

[0018] Further, the clamping structure comprises a clamping hook provided on one of the parallel plates and a clamping hole provided on the circuit board, and the clamping hook and the two metal pins are triangularly distributed.

[0019] The further arrangement has the advantages that the triangular distribution of the clamping hook and the two metal pins can improve the stability and reliability of the connection between the coil former and the circuit board.

[0020] Further, the clamping hook comprises a hook portion, the hook portion extends away from the other parallel plate, and the size of the hook portion is slightly larger than the size of the clamping hole.

[0021] The further arrangement has the advantage that the hook portion can be well positioned after being inserted into the card hole, and the hook portion extending away from the other parallel plate is not easy to interfere with the coil winding on the coil framework.

[0022] Further, at least one of the parallel plates is provided with a wire slot for the wire of the end portion of the coil winding, one end of the wire slot extending to the connection between the parallel plate and the connecting column, and the other end extending to the metal pin.

[0023] The further arrangement has the advantage that the wire slot can be used to accommodate the end portion of the coil winding, facilitating the arrangement of the end portion of the coil winding and the electrical connection with the metal pin.

[0024] Further, the residual current circuit breaker comprises a plurality of shafts for mounting and positioning or movably connecting the internal components of the residual current circuit breaker, the shafts and the internal components being arranged in the recess cavity, the inner wall of the recess cavity and the inner side of the cover plate being correspondingly provided with a plurality of positioning columns, the positioning columns being provided with shaft holes for cooperating with the end portions of the shafts, the inner diameter of the shaft holes being not greater than the diameter of the end portions of the shafts, and the shaft holes on the two positioning columns correspondingly provided on the inner wall of the recess cavity and the inner side of the cover plate being located on the same axis.

[0025] The further arrangement has the advantage that the fixed plate in the prior art is cancelled, the two ends of the shafts are directly inserted and positioned with the shaft holes on the base and the cover plate, the production cost can be reduced, the product weight can be reduced, the product structure can be simplified, the matching error of the part size can be reduced, and the product structure is more stable. In addition, the shaft holes are arranged on the positioning columns, the depth of the shaft holes is improved through the positioning columns, the inner diameter of the shaft holes is arranged to be not greater than the diameter of the end portions of the shafts, the end portion of the shaft can form a stable plug-in connection relationship with the shaft hole when being inserted into the shaft hole of the positioning column, and the other end of the shaft can be kept in a stable direction, so that the other end of the shaft and the shaft hole can be kept on the same axis and are not easy to tilt and shake, thereby facilitating assembly, especially automatic assembly.

[0026] Further, the positioning columns of the inner wall of the recess cavity are integrally formed with the base, the positioning columns on the inner side of the cover plate are integrally formed with the cover plate, and the connecting portions between the positioning columns of the inner wall of the recess cavity and the base and between the positioning columns on the inner side of the cover plate and the cover plate are integrally formed with reinforcing ribs.

[0027] The further arrangement has the advantage that the positioning columns can be reinforced to improve their stability and prevent them from being broken during assembly.

[0028] Further, the inner component comprises a movable contact for leakage protection, a swing lever for driving cooperation with a magnetic tripping assembly, a connecting rod for driving the movable contact to swing, and a tension spring for resetting the movable contact after swinging, the movable contact and the swing lever are rotatably arranged between the base and the cover plate through shafts connected thereto, one end of the tension spring is positioned and arranged between the base and the cover plate through a shaft connected thereto.

[0029] The further arrangement has the advantage that the movable contact, the swing lever, the connecting rod and the tension spring are conveniently assembled.

[0030] Further, a recess for accommodating a circuit board is arranged on the inner side of the cover plate, the reinforcing rib comprises a first reinforcing rib extending along the edge of the recess, and the first reinforcing rib is arranged between the two positioning columns connected with the swing lever and the tension spring and the cover plate.

[0031] The further arrangement has the advantage that the first reinforcing rib can simultaneously reinforce the two positioning columns connected with the swing lever and the tension spring, and can also be used for limiting with the circuit board, so that the overall structure is more compact and convenient for processing.

[0032] Further, an arc extinguishing chamber is formed between the base and the cover plate, the two positioning columns cooperatively installed with the movable contact and the movable contact are arranged in the arc extinguishing chamber, and the two positioning columns cooperatively installed with the movable contact and the tension spring are separated by arc blocking plates arranged on the inner wall of the recess and the inner side of the cover plate respectively, and a gap for the tension spring to pass through is left between the two arc blocking plates.

[0033] The further arrangement has the advantage that the arrangement of the arc blocking plates can prevent the arc from escaping, increase the creepage distance between the shafts cooperatively installed with the movable contact and the tension spring, and improve the safety performance.

[0034] Further, a limiting baffle for axially limiting the connecting rod is arranged on the inner side of the cover plate, and the limiting baffle is distributed along the movement track of the connecting rod.

[0035] The further arrangement has the advantage that the limiting baffle is arranged on the cover plate and cooperates with the connecting rod in height, which can limit the connecting rod in the axial direction, and the shape of the limiting baffle is arranged according to the movement track of the connecting rod, which can prevent the connecting rod from falling off and limit the connecting rod, and improves the stability and reliability of the movement of the connecting rod.

[0036] Further, a positioning frame for cooperatively embedding and positioning with a tripping coil is arranged on the inner wall of the recess, a through hole for movably connecting with an iron core is arranged on the coil framework, a convex ring for abutting with an end of a spring is arranged on the inner wall of the through hole, and the convex ring is arranged close to the end of the through hole.

[0037] The further arrangement has the advantages that the tripping coil can be aligned and placed in the positioning frame during assembly, the tripping coil is positioned, other components can be conveniently installed, the assembly efficiency is improved, the convex ring can be used for abutting cooperation with the spring, the spring is limited between the convex ring and the iron core, the spring is ensured not to be separated from the iron core during assembly, the assembly efficiency is improved, the components are reduced, and the cost is reduced.

[0038] Further, the test device includes a test button, a movable contact and a fixed contact, the base is respectively provided with a first positioning block, a first baffle, a second positioning block and a second baffle, one end of the fixed contact abuts at the inner side wall of the recess, the other end of the fixed contact abuts on the first baffle by passing the first positioning block, one end of the movable contact abuts on the test button, the other end of the movable contact abuts on the second baffle by passing the second positioning block, the base is provided with a first limiting structure and a second limiting structure for the fixed contact and the movable contact to abut and keep the fixed contact and the movable contact away from the inner wall of the bottom of the recess, and the cover is provided with a convex structure for limiting the fixed contact and the movable contact to keep away from the circuit board when the cover is closed with the base.

[0039] Further, the first positioning block, the first baffle, the second positioning block and the second baffle are arranged to enable the fixed contact and the movable contact to be placed as specified, so that the convex structure can abut and accurately push the fixed contact and the movable contact to a position away from the circuit board, the structure is simple and convenient to install. And the first limiting structure and the second limiting structure can keep a certain distance between the fixed contact, the movable contact and the inner wall of the bottom of the base, keep the height of the movable contact and the test button consistent, and enable the movable contact, the fixed contact and the test button to be aligned with each other, thereby improving the cooperation effect.

[0040] Further, the first limiting structure includes a first abutting block and a second abutting block, the first abutting block is fixed on the first baffle, and the second abutting block is fixed on the inner side wall of the recess of the base for the fixed contact to abut, the second limiting structure includes a third abutting block, a fourth abutting block and a fifth abutting block, the third abutting block is for the movable contact to abut on the end of the test button, the fourth abutting block is fixed on the second positioning block, and the fifth abutting block is fixed on the second baffle.

[0041] The further arrangement has the advantages that the stress of the movable contact and the fixed contact is more uniform, and the stability and reliability of the positioning of the two are improved.

[0042] Further, the second abutting block is L-shaped, the fixed contact is placed in the L-shaped recess of the second abutting block, one right angle edge of the second abutting block abuts on the inner wall of the bottom of the recess to form a height limiting part, and the other right angle edge abuts on the inner side wall of the recess to form a guide part.

[0043] The further setting brings the advantages that: the preferred second abutting block can be two, the stress points are increased, the static contact piece is placed more stably, one right angle edge of the second abutting block is connected to the bottom surface of the base, the other right angle edge is connected to the inner wall of the circumferential side of the base, the end of the static contact piece is abutted on the guide part, and the elastic force is increased.

[0044] Further, the convex structure comprises a first pressing block and a second pressing block, the first pressing block is arranged corresponding to the second abutting block, the second pressing block is arranged corresponding to the fourth abutting block, and the second positioning block is provided with a notch for the second pressing block to press down.

[0045] The further setting brings the advantages that: when the cover plate is covered on the base, the first pressing block is aligned with the static contact piece, the second pressing block is aligned with the dynamic contact piece, with the close connection of the cover plate and the base, the static contact piece and the dynamic contact piece are pressed to abut on the first limiting structure and the second limiting structure, the cooperation is close, the structure is stable, and the installation is convenient.

[0046] Further, the test button is provided with a chamfer on the side facing the inner wall of the bottom of the cavity.

[0047] The further setting brings the advantages that: during installation, the dynamic contact piece is installed first, and then the test button is installed, the chamfer at the end of the test button can form a guide cooperation with the dynamic contact piece, the end of the dynamic contact piece makes a yielding movement, and the two are not easy to interfere, so that the assembly is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 Decomposition of the embodiment of the application Figure 1 ;

[0049] Figure 2 Decomposition of the embodiment of the application Figure 2 ;

[0050] Figure 3 It is a schematic view of one side of the base in the embodiment of the application.

[0051] Figure 4 It is a schematic view of the other side of the base in the embodiment of the application.

[0052] Figure 5 It is Figure 5 a schematic view of the hidden circuit board in the embodiment of the application.

[0053] Figure 6 It is a structural view of the positioning baffle in the embodiment of the application.

[0054] Figure 7 It is an exploded view of the circuit board and the tripping coil in the embodiment of the application.

[0055] Figure 8 It is an assembly view of the circuit board and the tripping coil in the embodiment of the application.

[0056] Figure 9 This is a structural diagram of the coil frame in an embodiment of the present invention;

[0057] Figure 10 This is an assembly diagram of the internal components in an embodiment of the present invention;

[0058] Figure 11 The structure of the second cavity in the embodiment of the present invention Figure 1 ;

[0059] Figure 12 for Figure 11 Enlarged view of section A;

[0060] Figure 13 The structure of the second cavity in the embodiment of the present invention Figure 2 ;

[0061] Figure 14 This is a schematic diagram of the inner structure of the cover plate in an embodiment of the present invention;

[0062] Figure 15 This is a structural diagram of the positioning frame in an embodiment of the present invention;

[0063] Figure 16 This is a structural diagram of the convex ring in an embodiment of the present invention;

[0064] Figure 17 This is a structural diagram of the test button in an embodiment of the present invention;

[0065] Figure 18 Structural diagram of the experimental apparatus in this embodiment of the invention;

[0066] Figure 19 This is a partial structural diagram of the base in an embodiment of the present invention. Detailed Implementation

[0067] Examples of implementations of the residual current operated circuit breaker of the present invention Figures 1-19 As shown: It includes a base 1, a first cavity 11 is provided on one side of the base 1, and a second cavity 12 is provided on the other side of the base 1. The first cavity 11 and the second cavity 12 are closed by cover plates 2 provided on both sides of the base 1. The base 1 and the cover plates 2 are interlocked and connected by screws or rivets.

[0068] The residual current circuit breaker further comprises a circuit breaker module 3 and a leakage protection module 4 arranged in the first recess 11 and the second recess 12 respectively and shielded by the cover plate 2, the leakage protection module 4 comprises a zero sequence transformer 41 and a tripping mechanism, the tripping mechanism comprises a tripping coil 42, the zero sequence transformer 41 comprises a magnetic ring (not shown in the figure) and a secondary winding (not shown in the figure) wound on the magnetic ring, the tripping coil 42 comprises a coil frame 421 and a coil winding 422 wound on the coil frame 421, the base 1 is aligned with two L-phase terminal blocks (311, 312) and two N-phase terminal blocks (431, 432) arranged at two ends of the first recess 11 and the second recess 12 respectively, the terminal blocks can be one of the components of the terminal seat, the circuit breaker module 3 and the leakage protection module 4 respectively comprise a first wire 32 and a second wire 44 for carrying current of L phase and N phase, the first wire 32 and the second wire 44 are preferably flexible soft wires, the first wire 32 and the second wire 44 are arranged between the two L-phase terminal blocks (311, 312) and the two N-phase terminal blocks (431, 432) in the current direction respectively, the first wire 32 and the second wire 44 are wound on the zero sequence transformer 41 and pass through the inner hole of the zero sequence transformer 41 at least twice, a circuit board 45 is connected between the secondary winding and the tripping coil 42, the secondary winding is connected on the circuit board 45, the circuit board 45 is provided with a plurality of discrete components for realizing filtering of the output signal of the transformer and switching devices, the discrete components for realizing filtering of the output signal of the transformer can adopt resistors and capacitors, the discrete components for the switching devices can adopt silicon controlled switching elements, the secondary winding 412 wound on the magnetic ring 411, the plurality of switching elements and the tripping coil 42 are connected in sequence, since the first wire 32 and the second wire 44 are wound on the zero sequence transformer 41 and pass through the inner hole of the zero sequence transformer 41 at least twice, the output current of the zero sequence transformer 41 is larger than that of the traditional single-passing, which can be directly output to control the switching elements after filtering and voltage stabilization, so as to drive the tripping mechanism to act, while the traditional single-passing needs to be amplified by an integrated operational amplifier circuit before controlling the switching elements to drive the tripping mechanism to act, the traditional operational amplifier circuit and signal processing circuit usually need to be integrated on an integrated block, which has a high cost, while the circuit board 45 of the present application can reduce the production or purchase cost of the circuit board and make the volume of the circuit board smaller, so that the product is more compact. In addition, in order to improve the use effect, the plurality of discrete components can further comprise discrete components for realizing voltage stabilization of the output signal of the transformer, the discrete components for realizing voltage stabilization of the output signal of the transformer can adopt voltage stabilizing diodes.

[0069] The tripping coil 42 and the circuit board 45 are fixedly connected together and can be assembled in the housing of the circuit breaker at the same time, the two are not easy to shake, the internal structure of the product is more compact, and the assembly is convenient, which has higher reliability.

[0070] The second cavity 12 is provided with a positioning mechanism for cooperating with the zero sequence transformer 41, the positioning mechanism comprises a plurality of positioning baffles 5 integrally formed on the inner wall of the second cavity 12, the plurality of positioning baffles 5 are distributed in a circumferential direction and are used for cooperating with the zero sequence transformer 41 to be inserted and positioned, the zero sequence transformer 41 can be inserted and positioned at a position concentric with the circumferential distribution of the plurality of positioning baffles 5, the plurality of positioning baffles 5 can be uniformly distributed in a circumferential direction, and the plurality of positioning baffles 5 are at least two, and a gap 6 for accommodating a winding position of the first conductor 32 and / or the second conductor 44 is formed between at least two of the plurality of positioning baffles 5, the winding position refers to a position where the first conductor 32 and / or the second conductor 44 cooperates with the zero sequence transformer 41 to be wound, and the width of the gap 6 can be configured according to the number of times of winding through the core. The inserted positioning between the plurality of positioning baffles 5 and the zero sequence transformer 41 can mean that the plurality of positioning baffles 5 are simultaneously inserted into the inner hole of the zero sequence transformer 41, or can mean that the plurality of positioning baffles 5 are simultaneously nested on the outside of the zero sequence transformer 41. The positioning baffle 5 has a circular arc side wall 51 cooperating with the circumferential wall of the zero sequence transformer 41 to limit the position, when the plurality of positioning baffles 5 are simultaneously inserted into the inner hole of the zero sequence transformer 41, the circular arc side wall 51 is provided as an outward protrusion, when the plurality of positioning baffles 5 are nested on the outside of the zero sequence transformer 41, the circular arc side wall 51 is provided as an inward recess, and the latter scheme is preferred in the embodiment. When the plurality of positioning baffles 5 are inserted and positioned with the zero sequence transformer 41, the cover plate 2 can form axial limiting of the zero sequence transformer 41, further improving the stability of the positioning.

[0071] The residual current circuit breaker module 3 comprises an L-phase coil assembly 33, and the base 1 is provided with a first through hole 13 and a second through hole 14 which are in communication with the first cavity 11 and the second cavity 12, the first through hole 13 is arranged between the zero sequence transformer 41 and the L-phase terminal block 311 adjacent to the zero sequence transformer 41, the second through hole 14 is arranged between the L-phase coil assembly 33 and the zero sequence transformer 41, and the first through hole 13 and the second through hole 14 are arranged in a spaced manner to avoid mutual interference, the middle section of the first wire 32 is connected and matched with the zero sequence transformer 41, the first through hole 13 can be used for the L-phase terminal block 311 and the first wire 32 to pass through and be electrically connected, in order to realize the electrical connection of the L-phase terminal block 311 and the first wire 32, the L-phase terminal block 311 can pass through the first through hole 13, or the first wire 32 can pass through the first through hole 13, the second through hole 14 can be used for the L-phase coil assembly 33 and the second wire 44 to pass through and be electrically connected, in order to realize the electrical connection of the L-phase coil assembly 33 and the second wire 44, the L-phase coil assembly 33 can pass through the second through hole 14, or the second wire 44 can pass through the second through hole 14, in the embodiment, the L-phase terminal block 311 passes through the first through hole 31 and is electrically connected with one end of the first wire 32, the other end of the first wire 32 passes through the second through hole 14 and is electrically connected with the L-phase coil assembly 33. The tripping mechanism 4 comprises a static contact 46 and a dynamic contact 47 which are matched with each other, the middle section of the second wire 44 is connected and matched with the zero sequence transformer 41, and the two ends of the second wire 44 are respectively electrically connected with the static contact 46 and the N-phase terminal block 431, the dynamic contact 47 is electrically connected with the N-phase terminal block 432.

[0072] The coil former 421 comprises two parallel parallel plates 4211 parallel to each other, a connecting column 4212 connecting the two parallel plates 4211, a clamping structure provided between the parallel plate 4211 and the circuit board 45, the two parallel plates 4211 are provided with metal pins 423 for connecting the two ends of the coil winding 422 respectively, the metal pins 423 can be inserted into the parallel plate 4211 by interference, or can be integrally formed by injection molding on the parallel plate 4211, the circuit board 45 is provided with a welding hole 451 matched with the metal pin 423 for electrical connection, the clamping structure comprises a clamping hook 424 provided on one of the parallel plates 421 and a clamping hole 452 provided on the circuit board 45, the clamping hook 424 and the two metal pins 423 are distributed in a triangular shape, that is, the positions of the three are not on the same straight line, and the metal pin 121 and the clamping hook 424 are located on the same plane of the parallel plate 4211, the end of the clamping hook 424 has an L-shaped hook portion 4241, the hook portion 4241 extends away from the other parallel plate 421, and is not easy to interfere with the coil winding 422, the size of the hook portion 4241 is slightly smaller than the clamping hole 452, the hook portion 4241 can deform and pass into the clamping hole 452 from one side of the clamping hole 452, and pass out from the other side of the clamping hole 452 and clamp on the end face of the other side, to realize reliable connection.

[0073] The coil former 421 is in the shape of an I-shaped, the clamping hole 452 is a hole penetrating the circuit board 45, the clamping hook 424 is integrally provided with the parallel plate 4211, and the processing is convenient and the structure is simple.

[0074] The metal pin 121 is inserted into the welding hole 451 and then welded, to realize reliable electrical connection, reduce the wiring process, improve assembly efficiency, and also improve the stability of the connection between the coil former 421 and the circuit board 45.

[0075] At least one of the parallel plates 4211 is provided with a wire slot 425 for wiring the end of the coil winding 422, one end of the wire slot 425 extends to the connection between the parallel plate 4211 and the connecting column 4212, and the other end extends to the metal pin 121, which facilitates the extension of the end of the coil winding 422 from the connection between the parallel plate 4211 and the connecting column 4212 to the metal pin 121 along the wire slot 425, and facilitates the welding electrical connection with the metal pin 121.

[0076] The residual current circuit breaker comprises shafts 8 for mounting and positioning or movably connecting the internal components of the residual current circuit breaker, the shafts 8 and the internal components are arranged in the second cavity 12, the internal components refer to the parts arranged inside the residual current circuit breaker and movably connected or positioned by the shafts 8, the internal components can be the components of the circuit breaker module or the components of the leakage protection module, the inner wall of the second cavity 12 and the inner side of the cover plate 2 are correspondingly provided with a plurality of cylindrical positioning columns 7, the inner side of the cover plate 2 refers to the side of the cover plate 2 facing the second cavity 12, the positioning columns 7 are provided with shaft holes 71 for cooperating with the end of the shaft 8, the inner diameter of the shaft hole 71 is not greater than the diameter of the end of the shaft 8, so that the end of the shaft 8 can be inserted and positioned in the shaft hole 71, avoiding the shaking of the shaft 8, the shaft holes 71 on the two positioning columns 7 correspondingly arranged on the inner wall of the second cavity 12 and the inner side of the cover plate 2 are located on the same axis, facilitating the accurate insertion and cooperation of the two ends of the shaft 8 when the base 1 and the cover plate 2 are connected, especially facilitating the automatic assembly.

[0077] The insertion port of the shaft hole 71 is provided with a guide surface 72 capable of guiding the end of the shaft 8, the guide surface 72 is a conical inwardly recessed guide surface, and the small end of the guide surface 72 is connected with the insertion port of the shaft hole 71.

[0078] The length of the part of the shaft 8 inserted into the shaft hole 71 accounts for at least 1 / 4 of the total length of the shaft.

[0079] The positioning columns 7 on the inner wall of the second cavity 12 are integrally formed with the base 1, the positioning columns 7 on the inner side of the cover plate 2 are integrally formed with the cover plate 2, and the connecting parts between the positioning columns 7 on the inner wall of the second cavity 12 and the base 1 and between the positioning columns 7 on the inner side of the cover plate 2 and the cover plate 2 are integrally formed with reinforcing ribs 9 for reinforcing the positioning columns 7.

[0080] The internal components include a movable contact 47 for leakage on-off protection, a swing lever 483 for driving cooperation with a magnetic trip assembly 482 (the magnetic trip assembly 482 is composed of a trip coil 42 and an iron core), a connecting rod 484 for driving the swing of the movable contact 47, and a tension spring 485 for resetting the movable contact 47 after swinging, the movable contact 47 and the swing lever 483 are rotatably arranged between the base 1 and the cover plate 2 through the shafts 8 connected thereto, one end of the tension spring 485 is positioned and arranged between the base 1 and the cover plate 2 through the shaft 8 connected thereto, and the other end of the tension spring 485 is connected to the movable contact 47.

[0081] The inner side of the cover plate 2 is provided with a groove 21 for accommodating a circuit board 45, the reinforcing ribs 9 include a first reinforcing rib 91 extending along the edge of the groove 21, and the first reinforcing rib 91 is arranged between the two positioning columns 7 and the cover plate 2 connected with the swing lever 483 and the tension spring 485 respectively.

[0082] The base 1 and the cover plate 2 are connected to form an arc-extinguishing cavity, the arc-extinguishing cavity is formed by two arc-extinguishing grooves 120 on the base 1 and the cover plate 2, two positioning columns 7 matched with the moving contact 47 and the moving contact 47 are arranged in the arc-extinguishing cavity, two positioning columns 7 matched with the moving contact 47 and the tension spring 485 are separated by the arc-stopping plates 123 arranged on the inner wall of the second recess 12 and the inner side of the cover plate 2 respectively, the arc-stopping plates 123 are part of the sidewall of the arc-extinguishing groove 120, and a gap for the tension spring 485 to pass through is left between the two arc-stopping plates 123.

[0083] The reinforcing rib 9 further comprises a plurality of second reinforcing ribs 92 in triangular or long strip shape, and the plurality of second reinforcing ribs 92 are distributed along the circumference of the positioning column 7.

[0084] The inner side of the cover plate 2 is provided with a limiting baffle 124 for axially limiting the connecting rod 484, and the limiting baffle 124 is distributed along the movement track of the connecting rod 484. The limiting baffle 124 is arranged on the cover plate 2 and is matched with the connecting rod 484 in height, so as to limit the connecting rod 484 in the axial direction. Moreover, the limiting baffle 124 is arranged according to the movement track of the connecting rod 484, so as to prevent the connecting rod 484 from being separated from the shaft, especially the other end of the connecting rod 484 opposite to the end connected with the moving contact 47, thereby improving the stability and reliability of the movement of the connecting rod 484.

[0085] The inner wall of the second recess 12 is provided with a positioning frame 125 for embedding and positioning the trip coil 42, and the coil framework 421 is provided with a through hole 4213 movably connected with the iron core. The inner wall of the through hole 4213 is provided with a convex ring 4214 for abutting against the end of the spring, and the convex ring 4214 is arranged at a position close to the end of the through hole 4213.

[0086] The positioning frame 125 comprises two oppositely arranged positioning edges, and the two parallel plates 4211 are arranged in the space formed by the two positioning edges (see Figure 15 Since the coil framework 421 is a supporting component of the entire trip coil 42, the coil framework 421 only needs to be fixed.

[0087] The end face of the positioning edge away from the bottom inner wall of the second recess 12 has an inclined surface 1251, which is inclined from the outer side to the inner side of the positioning edge to the direction of the bottom inner wall of the second recess 12. The inclined surface 1251 is arranged to facilitate the coil framework 421 to enter the second recess 12, has a guiding effect, and has a simple structure and is convenient to install.

[0088] The outer side of the positioning edge is provided with a reinforcing rib 1121c. The reinforcing rib 1121c is provided to improve the strength. Preferably, only the reinforcing rib 10 needs to be provided on the positioning edge 1121 on the same side as the convex part 2111, because the spring abuts against the convex part 2111 to exert pressure on the parallel plate 4211 on the same side, that is, the pressure on the positioning edge on the same side is greater than that on the positioning edge 1121 on the other side, so the assistance of the reinforcing rib 10 is needed to improve the structural stability.

[0089] The residual current circuit breaker further comprises a test device, the test device comprising a test button 101, a movable contact 102 and a static contact 103, the base 1 being provided with a first positioning block 201, a first baffle 202, a second positioning block 203 and a second baffle 204 respectively, one end of the static contact 103 abutting against the inner side wall of the second recessed cavity 12, the other end of the static contact 103 abutting against the first baffle 202 by bypassing the first positioning block 201, one end of the movable contact 102 abutting against the test button 101, the other end of the movable contact 102 abutting against the second baffle 204 by bypassing the second positioning block 203, the static contact 103 being in a V shape, the bending part of the static contact 103 facing the test button 101, the two ends of the static contact 103 abutting against the first baffle 202 and the inner side wall of the second recessed cavity 12 under the action of the elasticity respectively, the bending part of the static contact 103 abutting against the outer contour of the first positioning block 201, the two ends of the movable contact 102 abutting against the second baffle 204 and the test button 101 under the action of the elasticity respectively, the bending part of the movable contact 102 abutting against the outer contour of the second positioning block 203, three points achieving positioning, the structure being simple and the installation efficiency being high, the base 1 being provided with a first limiting structure and a second limiting structure for the static contact 103 and the movable contact 102 to abut against and keep the static contact 103 and the movable contact 102 away from the inner wall of the bottom of the recessed cavity 12 respectively, the cover plate 2 being provided with a protruding structure for limiting the static contact 102 and the movable contact 103 to be away from the circuit board 45 when the base 1 is covered.

[0090] The first limiting structure comprises a first abutting block 301 and a second abutting block 302, the first abutting block 301 being fixed on the first baffle 202, the second abutting block 302 being fixed on the inner side wall of the recessed cavity 12 of the base 1 for the static contact 103 to abut against, the second limiting structure comprising a third abutting block 303, a fourth abutting block 304 and a fifth abutting block 305, the third abutting block 303 being for the movable contact 102 to abut against the end of the test button 101, the fourth abutting block 304 being fixed on the second positioning block 203, the fifth abutting block 305 being fixed on the second baffle 204.

[0091] The second abutment block 302 is L-shaped, and the stationary contact piece 103 is placed in the L-shaped cavity of the second abutment block 302. One right-angled side of the second abutment block 302 abuts against the bottom inner wall of the second cavity 12 to form a height limiting part 3021, and the other right-angled side abuts against the inner side wall of the second cavity 12 to form a guide part 3022. The end face of the guide part 3022 away from the height limiting part 3021 is inclined upward toward the inner side wall of the second cavity 12, thereby facilitating the installation of the stationary contact piece 103.

[0092] The protruding structure includes a first pressing block 401 and a second pressing block 402. The first pressing block 401 is set corresponding to the second abutting block 302, and the second pressing block 402 is set corresponding to the fourth abutting block 304. The second positioning block 203 is provided with a notch for the second pressing block 402 to press down.

[0093] like Figure 17 As shown, the test button 101 has a chamfer 1011 on the side facing the inner wall of the second cavity 12. The chamfer 1011 is located on the end face 1012 of the test button 101 facing the movable contact 102. The chamfer 1011 is located on the side of the end face 1012 away from the cover plate 2, and is inclined from the side near the inner wall of the base 11 towards the side near the cover plate 2 towards the movable contact 102. During installation, the movable contact is installed first, and then the test button 101 is installed. The chamfer 1011 at the end of the test button 101 can form a guiding fit with the movable contact 102, allowing the end of the movable contact 102 to make a yielding movement. The two are less likely to interfere with each other, which facilitates assembly.

[0094] The above embodiments are merely one preferred embodiment of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included within the protection scope of the present invention.

Claims

1. A residual current circuit breaker, comprising a base, a cover plate, the base is provided with a recessed cavity on one side for accommodating a leakage protection module, the cover plate is used to cooperate with the recessed cavity to close, the leakage protection module comprises a zero sequence transformer and a tripping mechanism, the tripping mechanism comprises a tripping coil, the zero sequence transformer comprises a magnetic ring and a secondary winding wound on the magnetic ring, and a first wire and a second wire for carrying current of L phase and N phase respectively are further included and pass through the magnetic ring, the tripping coil comprises a coil skeleton and a coil winding wound on the coil skeleton, and a circuit board is connected between the secondary winding and the tripping coil, characterized in that: The first and second conductors are wound on the zero sequence transformer and pass through the inner hole of the zero sequence transformer at least twice, the circuit board is provided with a plurality of discrete components for filtering the output signal of the transformer and switching devices, the secondary winding and the trip coil are electrically connected through the plurality of discrete components; the recess is provided with a positioning mechanism for cooperating with the zero sequence transformer, the positioning mechanism comprises a plurality of positioning baffles integrally formed on the inner wall of the recess, the plurality of positioning baffles are distributed circumferentially and used for cooperating with the zero sequence transformer for plug-in positioning; the positioning baffles are at least two, and at least two of the positioning baffles are spaced apart to form a gap for accommodating the winding part of the first conductor and / or the second conductor, the positioning baffles have arc side walls for limiting the circumferential wall of the zero sequence transformer; the coil former comprises two parallel plates parallel to each other and a connecting column connecting the two parallel plates.

2. The residual current operated circuit breaker according to claim 1, characterized in that: A clamping structure is arranged between the parallel plate and the circuit board, the two parallel plates are each provided with a metal pin for connecting the two ends of the coil winding, and the circuit board is provided with a welding hole for electrically connecting the metal pin.

3. The residual current operated circuit breaker according to claim 2, characterized in that: The clamping structure comprises a clamping hook arranged on one of the parallel plates and a clamping hole arranged on the circuit board, and the clamping hook and the two metal pins are triangularly distributed.

4. The residual current operated circuit breaker according to claim 3, characterized in that: The clamping hook comprises a hook portion, which extends away from the other parallel plate, and the size of the hook portion is slightly larger than that of the clamping hole.

5. The residual current operated circuit breaker according to claim 2, characterized in that: At least one of the parallel plates is provided with a wire slot for wiring the end of the coil winding, one end of the wire slot extends to the connection between the parallel plate and the connecting column, and the other end extends to the metal pin.

6. The residual current circuit breaker according to claim 1, characterized in that: A plurality of shafts for mounting and positioning or movably connecting the internal components of the residual current circuit breaker are included, the shafts and the internal components are arranged in the recess, a plurality of positioning columns are correspondingly arranged on the inner wall of the recess and the inner side of the cover plate, a shaft hole for plug-in positioning with the end of the shaft is arranged on the positioning column, the inner diameter of the shaft hole is not greater than the diameter of the end of the shaft, and the shaft holes on the two positioning columns correspondingly arranged on the inner wall of the recess and the inner side of the cover plate are located on the same axis.

7. The residual current circuit breaker according to claim 6, characterized in that: The positioning columns of the inner wall of the recess are integrally formed with the base, the positioning columns of the inner side of the cover plate are integrally formed with the cover plate, and the connecting portions between the positioning columns of the inner wall of the recess and the base and between the positioning columns of the inner side of the cover plate and the cover plate are integrally formed with reinforcing ribs.

8. The residual current operated circuit breaker according to claim 7, characterized in that: The internal components include a movable contact for leakage protection, a swing lever for driving cooperation with a magnetic trip assembly, a connecting rod for driving the swing of the movable contact, and a tension spring for resetting the swing of the movable contact, the movable contact and the swing lever are rotatably arranged between the base and the cover plate through the shafts connected thereto, and one end of the tension spring is positioned between the base and the cover plate through the shaft connected thereto.

9. The residual current circuit breaker according to claim 8, characterized in that: The inner side of the cover plate is provided with a recess for accommodating the circuit board, and the reinforcing ribs include a first reinforcing rib extending along the edge of the recess, and the first reinforcing rib is arranged between the two positioning columns connected with the swing lever and the tension spring and the cover plate.

10. The residual current circuit breaker according to claim 8, characterized in that: The connecting part between the base and the cover plate forms an arc extinguishing cavity, two positioning columns matched with the moving contact are arranged in the arc extinguishing cavity, and the two positioning columns matched with the moving contact and the tension spring are separated by two arc blocking plates respectively arranged on the inner wall of the concave cavity and the inner side of the cover plate.

11. The residual current circuit breaker according to claim 8, characterized in that: The inner side of the cover plate is provided with a limiting baffle for limiting the axial movement of the connecting rod.

12. The residual current circuit breaker according to claim 1, characterized in that: The inner wall of the concave cavity is provided with a positioning frame matched with the tripping coil, the coil former is provided with a through hole movably connected with the iron core, the inner wall of the through hole is provided with a convex ring for abutting the end of the spring, and the convex ring is arranged close to the end of the through hole.

13. The residual current circuit breaker according to claim 1, characterized in that: The test device comprises a test button, a moving contact and a static contact, the base is provided with a first positioning block, a first baffle, a second positioning block and a second baffle, one end of the static contact abuts against the inner side wall of the concave cavity, the other end of the static contact abuts against the first baffle through the first positioning block, one end of the moving contact abuts against the test button, the other end of the moving contact abuts against the second baffle through the second positioning block, the base is provided with a first limiting structure and a second limiting structure for separating the static contact and the moving contact from the inner wall of the concave cavity, and the cover plate is provided with a convex structure for limiting the static contact and the moving contact from the circuit board when the cover plate covers the base.

14. The residual current circuit breaker according to claim 13, characterized in that: The first limiting structure comprises a first abutting block and a second abutting block, the first abutting block is fixed on the first baffle, and the second abutting block is fixed on the inner side wall of the concave cavity of the base for abutting the static contact, the second limiting structure comprises a third abutting block, a fourth abutting block and a fifth abutting block, the third abutting block is arranged on the end of the test button for abutting the moving contact, the fourth abutting block is fixed on the second positioning block, and the fifth abutting block is fixed on the second baffle.

15. The residual current circuit breaker according to claim 14, characterized in that: The second abutting block is L-shaped, the static contact is arranged in the L-shaped concave cavity of the second abutting block, one straight edge of the second abutting block abuts against the inner wall of the concave cavity to form a height limiting part, and the other straight edge abuts against the inner side wall of the concave cavity to form a guide part.

16. The residual current circuit breaker according to claim 15, characterized in that: The convex structure comprises a first pressing block and a second pressing block, the first pressing block is arranged corresponding to the second abutting block, and the second pressing block is arranged corresponding to the fourth abutting block, and the second positioning block is provided with a notch for the second pressing block to press downward.

17. Residual current operated circuit breaker according to any of claims 13 to 16, characterized in that: The test button is provided with a chamfer on the side facing the inner wall of the concave cavity.

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