B-type electromagnetic residual-current circuit breaker

Abstract

The utility model relates to a circuit breaker, in particular to a B-type electromagnetic leakage circuit breaker, which comprises a base and an upper cover arranged on the base, and the base is provided with a free tripping mechanism, an electromagnetic tripper, an electromagnetic leakage sensing module, a moving contact unit, a static contact unit and a circuit board. The electromagnetic release, the electromagnetic leakage induction module and the circuit board are connected through a plug-in wiring terminal. The B-type electromagnetic residual-current circuit breaker overcomes the defects in the prior art, and is reasonable in structure and convenient to install.

Description

Technical Field

[0001] This utility model relates to the field of leakage current protection switch technology, and more specifically, to a type B electromagnetic leakage current circuit breaker. Background Technology

[0002] Residual current circuit breakers (RCCBs) are primarily used to protect equipment from leakage current faults and to protect individuals from potentially fatal electric shocks. They offer overload and short-circuit protection and can be used to protect circuits or motors from overload and short circuits. They can also be used for infrequent switching and starting of circuits under normal conditions. Current RCCBs are classified into AC, A, and B types based on their residual current operating characteristics. AC type RCCBs protect against sinusoidal AC residual current, A type RCCBs protect against sinusoidal AC and pulsating DC residual current, and B type RCCBs protect against sinusoidal AC, pulsating DC, and smooth DC residual current. These types offer more comprehensive protection against leakage current faults in various complex circuit environments and are particularly suitable for circuits containing nonlinear loads such as electronic equipment and frequency converters, which may generate pulsating DC or smooth DC leakage current during operation.

[0003] The rapidly growing electric vehicle business has driven the vigorous development and expansion of vehicle residual current devices (RCDs), leading to higher requirements for leakage current detection. Due to cost considerations, most charging pile manufacturers connect Type A residual current circuit breakers (RCDs) at the front end of the charging pile. However, the internal structure must be certified to smooth the DC 6mA residual current (MD) function according to IEC 62955 (Radio Interference Measurement Standard) to avoid the inability to accurately detect effective DC leakage current signals, thus affecting the effectiveness and safety of the leakage protection function. In contrast, Type B RCDs do not require the addition of a DC 6mA residual current monitor (RCD MD) inside the charging pile, thus solving the problem that Type A RCDs cannot detect the DC component present in the charging pile, ensuring the accuracy and effectiveness of the leakage protection function.

[0004] In existing B-type electromagnetic residual current circuit breakers, the internal wiring connections between various structures mainly rely on welding, and the assembly process is quite cumbersome due to the changes in induced current through the zero-sequence current transformer. Therefore, the existing technology urgently needs significant improvement. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and provide a type B electromagnetic leakage circuit breaker, including a base and an upper cover disposed on the base. The base is provided with a free tripping mechanism, an electromagnetic trip unit, an electromagnetic leakage current sensing module, a moving contact unit, a stationary contact unit, and a circuit board. The electromagnetic trip unit, the electromagnetic leakage current sensing module, and the circuit board are connected by pluggable terminals.

[0006] By adopting the above technical solutions, the internal structure of the B-type electromagnetic leakage circuit breaker provided by this utility model is relatively clear and the structural layout is reasonable.

[0007] The present invention is further configured such that the base is provided with multiple limiting grooves, the circuit board is installed at the bottom of the base, and the free tripping mechanism, the electromagnetic tripping device and the electromagnetic leakage current induction module are sequentially limited and installed at the top end through multiple limiting grooves from left to right.

[0008] By adopting the above technical solution, the limiting groove clearly distributes the components of the circuit breaker provided by this utility model inside the base, making the installation method simple and convenient for assembly.

[0009] The present invention is further configured such that the limiting groove of the base for installing the free release mechanism is provided with a pin hole, the free release mechanism is provided with a protruding part corresponding to the pin hole for limiting connection, and the two ends are provided with a first connecting ear and a second connecting ear for connecting to the base.

[0010] By adopting the above technical solution, the free release mechanism is fixedly connected to the base with a pin, which is convenient for installation.

[0011] The present invention is further configured such that the moving contact unit includes a moving contact fixing member and a connecting shaft, one end of the connecting shaft is fixed on the moving contact fixing member limiting groove of the base, and the other end is limited between the free release mechanism and the base, and can be rotated; the moving contact fixing member is fixedly connected to the connecting shaft at equal intervals; a slot is left between the second connecting ear of the free release mechanism and the base for the connecting shaft to pass through.

[0012] By adopting the above technical solution, one end of the moving contact unit is fixed between the base and the free tripping mechanism, which facilitates the moving contact unit to react quickly and shorten the action time when the circuit breaker operates. In addition, the moving contact fixing parts are fixed at equal intervals on the connecting shaft, and the number of moving contact fixing parts can be adjusted according to different power application occasions, and the current interference that may exist between the contacts can be effectively reduced.

[0013] The present invention is further configured such that the moving contact unit includes a moving contact fixing member, a return spring, and a moving contact, wherein the return spring and the moving contact abut against each other within the moving contact fixing member; the moving contact unit also includes a spring, wherein the spring is fixed within a spring groove in the base, and the moving contact fixing member is in contact with the spring.

[0014] By adopting the above technical solution, the connecting shaft connects multiple moving contact fixing parts in series at equal intervals, and internally connects and fixes the moving contact, and abuts against the return spring; the iron core is in direct contact with the latch, reducing the action time; the spring and the moving contact fixing parts abut against each other, and when the free tripping mechanism is activated, it drives the moving contact unit to disengage from the stationary contact unit. Under the elastic force of the spring, its disengagement speed can be accelerated, so that the circuit breaker can quickly cut off the circuit.

[0015] The present invention is further configured such that the electromagnetic leakage current induction module includes a zero-sequence current transformer and a magnetic ring, the zero-sequence current transformer is fixed in the zero-sequence current transformer limiting groove of the base, and the magnetic ring is fixedly connected thereto.

[0016] By adopting the above technical solution, the traditional method of winding the circuit around the zero-sequence current transformer to sense the magnetic field change generated by the residual current, magnetizing the iron core in the electromagnetic trip unit, attracting the armature to move, and thus triggering the trip mechanism is abandoned. In this method, the circuits are connected to the circuit board by welding. This utility model provides a method of fixing the magnetic ring to the upper end of the zero-sequence current transformer, sensing the magnetic field change generated by the residual current, magnetizing the iron core in the electromagnetic trip unit, striking the latch, and thus triggering the trip mechanism.

[0017] The present invention is further configured such that the free release mechanism includes a latch, a jumper, a first link, a second link, and a handle. The latch, jumper, first link, second link, and handle are all connected by pins and distributed from the inside to the outside of the free release mechanism. One end of the latch extends out of the free release mechanism to cooperate with the electromagnetic release device.

[0018] By adopting the above technical solutions, the latch, trip latch, first link, second link and handle are set inside the free tripping mechanism, further clarifying the internal structure of the circuit breaker.

[0019] The present invention is further configured such that the circuit board includes a first plug-in terminal fixed on the circuit board for connecting the electromagnetic trip unit and the electromagnetic leakage current induction module; the electromagnetic trip unit includes an iron core and a second plug-in terminal; the electromagnetic leakage current induction module includes a zero-sequence current transformer, a magnetic ring and a third plug-in terminal, the magnetic ring is fixed on the zero-sequence current transformer, and the second plug-in terminal and the third plug-in terminal are connected to the first plug-in terminal.

[0020] By adopting the above technical solution, the electromagnetic trip unit and the electromagnetic leakage current sensing module are interconnected with the circuit board in a plug-in form through the extended second and third plug-in terminals to realize the transmission of electrical signals, thereby improving the sensing efficiency and increasing safety.

[0021] The present invention is further provided that the base is provided with multiple heat dissipation grooves at equal intervals on both sides of the inlet and outlet and at the bottom.

[0022] By adopting the above technical solution, multiple heat dissipation slots are opened on the base, which can effectively provide good heat dissipation for this utility model during operation, avoid damage to the internal structure due to excessive working temperature, better protect the circuit board, and improve safety. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0024] Figure 1 This is a schematic diagram of the overall structure of a type B electromagnetic leakage circuit breaker according to this utility model;

[0025] Figure 2 This is an exploded view of a type B electromagnetic leakage circuit breaker according to this utility model;

[0026] Figure 3 for Figure 2 A schematic diagram of the free-release mechanism in the structure;

[0027] Figure 4 for Figure 3 A schematic diagram of the internal structure of the free-release mechanism in the structure;

[0028] Figure 5 This is a schematic diagram of the internal structure of a type B electromagnetic leakage circuit breaker according to this utility model;

[0029] Figure 6 for Figure 2 A schematic diagram showing the distribution of the free tripping mechanism, electromagnetic trip unit, electromagnetic leakage current induction module, and circuit board in the structure.

[0030] Figure 7 for Figure 1 A schematic diagram of the internal structure of the base in the structure;

[0031] Figure 8 for Figure 7 Side view of the base in the structure;

[0032] Figure 9 for Figure 1 Exploded view of the moving contact unit structure in the structure;

[0033] Figure 10 for Figure 1 Rear view of the structure after the top cover has been removed;

[0034] Figure 11 for Figure 9 A cross-sectional view along the AA direction.

[0035] The image shows a 100-B type electromagnetic residual current circuit breaker.

[0036] 1-Top cover; 10-Test button

[0037] 2-Base; 20-Wiring port; 21-Screw hole; 22-Heat dissipation groove; 23-Terminal; 24-Limiting groove; 241-Pin hole; 242-Zero-sequence transformer limiting groove; 243-Moving contact fixing member limiting groove; 244-Spring groove

[0038] 3-Free release mechanism; 30-Block; 31-Lock; 32-Jump lock; 33-First link; 34-Second link; 35-Handle; 351-Energy storage disc spring; 36-First connecting ear; 37-Second connecting ear;

[0039] 4-Electromagnetic trip unit; 40-Iron core; 41-Second plug-in terminal;

[0040] 5-Electromagnetic leakage current induction module; 50-Zero sequence current transformer; 51-Magnetic ring; 52-Third plug-in terminal;

[0041] 6-Moving contact unit; 60-Moving contact fixing component; 61-Return spring; 62-Moving contact; 63-Connecting shaft; 64-Spring

[0042] 7-Stationary contact unit: 70-Stationary contact;

[0043] 8-Circuit board. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0046] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Thus, the directional and positional terms used are for illustrating and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0047] Example:

[0048] This invention proposes a type B electromagnetic leakage circuit breaker, which is suitable for circuits containing nonlinear loads such as electronic equipment and frequency converters. These devices may generate pulsating DC or smooth DC leakage current during operation, and this invention can effectively detect and protect against these leakage faults.

[0049] Please see Figures 1 to 9 A type B residual current circuit breaker includes a top cover 1, a base 2, a free tripping mechanism 3, an electromagnetic trip unit 4, an electromagnetic leakage current sensing module 5, a moving contact unit 6, a stationary contact unit 7, and a circuit board 8. The base includes a wiring port 20, screw holes 21, a heat dissipation groove 22, a wiring terminal 23, and a spring groove 244. The free tripping mechanism 3 includes a partition 30, a latch 31, a jumper 32, a first connecting rod 33, a second connecting rod 34, a handle 35, and an energy storage disc spring 351. The electromagnetic trip unit 4 includes an iron core 40 and a second plug-in terminal 41. The electromagnetic leakage current sensing module 5 includes a zero-sequence current transformer 50, a magnetic ring 51, and a third plug-in terminal 52. The moving contact unit 6 includes a moving contact fixing member 60, a spring 64, and a moving contact 62. The stationary contact unit 7 includes a stationary contact 70. The circuit board 8 includes plug-in terminals.

[0050] In this embodiment of the utility model, the free tripping mechanism 3, the electromagnetic trip unit 4, and the electromagnetic leakage current induction module 5 are sequentially installed from left to right on the limiting groove 24 in the base 2. The upper cover 1 has a slot for the handle 35 and the test button 10 to move. One side of the electromagnetic trip unit 4 is tightly connected to the other side of the free tripping mechanism partition 30 by a pin, and the iron core 40 can extend out to contact the latch 31. The circuit board 8 is fixed inside the lower part of the base 2 and does not interfere with other components. The second plug-in terminal 41 and the third plug-in terminal 52 are plugged into the plug-in terminal 80 to realize the transmission of electrical signals between the components. The magnetic ring 51 is fixed on the zero-sequence current transformer 50, and a set of third plug-in terminals 52 extends out and are plugged into the circuit board. As for the number of the set of third plug-in terminals, there is no specific limit here, and it can be selected according to the current in the circuit. Specifically, in this embodiment, a set is two.

[0051] In this embodiment of the utility model, one end of the latch 31 extends to the outside of the free release mechanism 3 and can abut against the iron core 40, while the other end contacts one end of the jump buckle 32. The other end of the jump buckle 32 has a slot into which one end of the first connecting rod 33 is inserted. The other end of the first connecting rod 33 has a beveled cut that connects to a protrusion at one end of the second connecting rod 34. The other end of the second connecting rod 34 is fixedly connected to a pin on the free release mechanism. The handle, latch, release mechanism, first connecting rod, and second... All connecting rods are fixed inside the free-release mechanism by pins, forming a five-bar linkage to achieve rapid release. The handle 35 is equipped with an energy storage disc spring 351 with energy storage effect. When closing the circuit, operating the handle 35 will drive the energy storage disc spring 351, which is in a tightened state. When opening the circuit, the energy storage disc spring 351 releases its elastic force to accelerate the release action. As for the energy storage structure with energy storage effect, no specific limitation is set here. Specifically, in this embodiment, the energy storage structure is an energy storage disc spring.

[0052] In this embodiment of the present invention, a set of moving contact fixing members 60 are equidistantly fixed on the connecting shaft 63. One end of the connecting shaft is connected and fixed in the moving contact fixing member limiting groove 243 in the base 2, and the other end is fixed in the middle by the free release mechanism 3 and the base 2 by screws, and can be rotated. The reset spring 61 and the moving contact 62 abut against each other inside the moving contact fixing member. One end of the spring 64 is fixed in the spring groove 244, and the other end abuts against the moving contact fixing member 60. The stationary contact unit 7 is fixed on the base 2 near the inlet and connected to the terminal 23. When the B-type electromagnetic leakage circuit breaker provided by the present invention is working, the moving contact 62 contacts the stationary contact 70 to realize the circuit connection.

[0053] Specific implementation process: During the closing operation, the external operating force (such as the force applied by the manual operating handle) is transmitted to the above-mentioned free tripping mechanism through the transmission components. The free tripping mechanism converts and transmits this force, causing the moving contact of the circuit breaker to move towards the stationary contact, thereby achieving contact closure. When the circuit is working normally and there is no leakage fault, the electromagnetic leakage current sensing module 5 will not detect abnormal current, so it will not trigger the tripping mechanism. The leakage circuit breaker will remain in a normal energized state to ensure that the load can work normally. When leakage occurs in the circuit, the zero-sequence current transformer 50 can detect the current imbalance and transmit the electrical signal to the control circuit. The B-type leakage circuit breaker has a preset threshold for the leakage current. This threshold is the basis for judging whether there is a leakage fault in the circuit and whether protection action is required. The circuit board 8 compares the leakage current corresponding to the processed sensing signal with the preset threshold. If the leakage current exceeds the set threshold, the control circuit will judge that a leakage fault has occurred in the circuit and further trigger the electromagnetic tripping device 4 to generate magnetism. The iron core 40 strikes the latch 31 under the action of magnetic force, thereby triggering the free tripping mechanism 3 to act. The five-bar linkage changes its motion state under the action of the tripping force, driving the moving contact unit 6 to quickly leave the stationary contact unit 7 and quickly disconnect under the action of the spring 64, cutting off the power supply to the circuit.

[0054] After the leakage fault is cleared, the Type B residual current circuit breaker can be reset manually or automatically. If it is an automatically reset Type B residual current circuit breaker, it will automatically return to the normal closed state after the fault is cleared so that the circuit can be powered again; if it is a manually reset circuit breaker, the reset button needs to be manually operated to restore the circuit breaker to the normal working state.

[0055] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A type B electromagnetic residual current circuit breaker, comprising a base (2) and an upper cover (1) disposed on the base (2), wherein the base (2) is provided with a free tripping mechanism (3), an electromagnetic trip unit (4), an electromagnetic leakage current induction module (5), a moving contact unit (6), a stationary contact unit (7), and a circuit board (8), characterized in that: The electromagnetic trip unit (4), the electromagnetic leakage current induction module (5), and the circuit board (8) are connected by plug-in terminals.

2. The type B electromagnetic residual current circuit breaker according to claim 1, characterized in that: The base (2) is provided with multiple limiting grooves (24). The circuit board (8) is installed at the bottom of the base (2), and the upper end is installed with the free release mechanism (3), electromagnetic release device (4) and electromagnetic leakage current induction module (5) sequentially from left to right through multiple limiting grooves (24).

3. A type B electromagnetic residual current circuit breaker according to claim 2, characterized in that: The base (2) has a limiting groove (24) for mounting the free release mechanism (3) with a pin hole (241). The free release mechanism (3) has a protruding part that is corresponding to the pin hole (241) for limiting connection, and has a first connecting ear (36) and a second connecting ear (37) at both ends that are connected to the base (2).

4. A type B electromagnetic residual current circuit breaker according to claim 3, characterized in that: The moving contact unit (6) includes a moving contact fixing member (60) and a connecting shaft (63). One end of the connecting shaft (63) is fixed on the moving contact fixing member limiting groove (243) of the base (2), and the other end is restricted between the free release mechanism (3) and the base (2), and can be rotated. The moving contact fixing member (60) is fixedly connected to the connecting shaft (63) at equal intervals. The second connecting ear (37) of the free release mechanism (3) and the base (2) have a slot for the connecting shaft (63) to pass through.

5. A type B electromagnetic residual current circuit breaker according to claim 4, characterized in that: The moving contact unit (6) further includes a moving contact fixing member (60), a return spring (61), and a moving contact (62). The return spring (61) and the moving contact (62) abut against each other in the moving contact fixing member (60). The moving contact unit (6) further includes a spring (64). The spring (64) is fixed in the spring groove (244) in the base (2). The moving contact fixing member (60) and the spring (64) are in contact connection.

6. A type B electromagnetic residual current circuit breaker according to claim 2, characterized in that: The electromagnetic leakage current induction module (5) includes a zero-sequence current transformer (50) and a magnetic ring (51). The zero-sequence current transformer (50) is fixed in the zero-sequence current transformer limiting groove (242) of the base (2), and the magnetic ring (51) is fixedly connected thereto.

7. A type B electromagnetic residual current circuit breaker according to claim 1, characterized in that: The free release mechanism (3) includes a latch (31), a jumper (32), a first link (33), a second link (34), and a handle (35). The latch (31), jumper (32), first link (33), second link (34), and handle (35) are all connected by pins and distributed from the inside to the outside of the free release mechanism. One end of the latch (31) extends to the outside of the free release mechanism (3) to cooperate with the electromagnetic release device (4).

8. A type B electromagnetic residual current circuit breaker according to claim 1, characterized in that: The circuit board (8) includes a first plug-in terminal fixed on the circuit board (8) for connecting the electromagnetic trip unit (4) and the electromagnetic leakage current sensing module (5); the electromagnetic trip unit (4) includes an iron core (40) and a second plug-in terminal (41); the electromagnetic leakage current sensing module (5) includes a zero-sequence current transformer (50), a magnetic ring (51) and a third plug-in terminal (52), the magnetic ring (51) is fixed on the zero-sequence current transformer (50), and the second plug-in terminal (41) and the third plug-in terminal (52) are connected to the first plug-in terminal.

9. A type B electromagnetic residual current circuit breaker according to claim 1, characterized in that: The base (2) has multiple heat dissipation slots (22) at equal intervals on both sides of the inlet and outlet and at the bottom.

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