circuit breaker
By setting wiring ports and plugs on the side wall of the circuit breaker housing, the problem of cumbersome connection of existing circuit breaker accessory modules is solved, realizing modular automated assembly and simplified connection of the circuit breaker.
Patent Information
- Application Number
- CN202210654883.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-06-10
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2042-06-10
Smart Images
Figure CN117253754B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to a circuit breaker. Background Technology
[0002] Low-voltage circuit breakers are used to distribute electrical energy and protect lines and power equipment from overload and short circuits. They can also be used for infrequent line switching and infrequent motor starting. With the continuous development of IoT and AI technologies, smaller size and modularity are becoming the trend for low-voltage circuit breakers. To meet current usage requirements, circuit breakers need to be connected to accessory modules. However, existing circuit breakers do not have slots, meaning that the connection between accessory modules and circuit breakers is merely a positional one. Accessory modules still require cumbersome wiring to be connected to the main circuit of the circuit breaker, which is detrimental to the modular development of circuit breakers. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a circuit breaker that is easy to wire and meets the requirements of modular development.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A circuit breaker includes a housing and at least one circuit breaker pole disposed within the housing. Each circuit breaker pole includes at least one phase main line. A first wiring port is provided on the side wall of the housing. At least one phase main line is connected to a lead-out conductive element, and the lead-out conductive element is provided with a plug portion.
[0006] The connector has a slot and is disposed opposite to the first wiring port, and / or at least one of the connectors extends out of the housing through the first wiring port.
[0007] Furthermore, the circuit breaker pole includes at least one L-phase main line and an N-phase main line, and the N-phase main line and one of the L-phase main lines are respectively connected to a lead-out conductive element, and two parallel first wiring ports are provided on one side wall of the housing.
[0008] Furthermore, the outer casing sidewall with the first connection port includes a first cover and a second cover that are spliced together, wherein the first connection port is located at the splice between the first cover and the second cover.
[0009] Furthermore, the circuit breaker includes an N-pole stationary contact, and a lead-out conductive element is connected to the stationary contact plate of the N-pole stationary contact.
[0010] Furthermore, at least one circuit breaker pole includes a short-circuit protection mechanism, on which a lead-out conductive element is connected.
[0011] Furthermore, the short-circuit protection mechanism includes a coil assembly, with the first terminal of the coil of the coil assembly serving as a lead-out conductive element, and the plug portion being a conductive area where the first terminal extends out of the outer casing through the first terminal port.
[0012] Furthermore, the short-circuit protection mechanism includes a coil assembly, with a connecting plate connected to the first terminal of the coil of the coil assembly. The connecting plate serves as a conductive lead, and a connector is provided at the end of the connecting plate away from the first terminal.
[0013] Furthermore, the connector includes a first contact piece and a second contact piece. One end of the second contact piece is bent and connected to the first contact piece, and the other end of the second contact piece is spaced apart from the first contact piece, so that a slot is formed between the first contact piece and the second contact piece.
[0014] Furthermore, it includes two circuit breaker poles, one of which is the L pole. The L pole includes an L pole incoming terminal, an L pole contact mechanism, and a short-circuit protection mechanism. The L pole contact mechanism includes an L pole moving contact and an L pole stationary contact. The L pole moving contact is electrically connected to the L pole incoming terminal, and the L pole stationary contact is connected to the second terminal of the coil of the short-circuit protection mechanism. The first terminal of the coil is connected to a connecting plate, which serves as a lead-out conductive element. The end of the connecting plate near the L pole stationary contact is provided with a plug-in portion.
[0015] Furthermore, one of the two circuit breaker poles is the N pole, which includes an N pole incoming terminal and an N pole contact mechanism. The N pole contact mechanism includes an N pole moving contact and an N pole stationary contact. The N pole moving contact is electrically connected to the N pole incoming terminal. Another lead-out conductive element is connected to the stationary contact plate of the N pole stationary contact. The lead-out conductive elements of the L pole and the N pole are arranged side by side and extend in the same direction.
[0016] Furthermore, the circuit breaker is provided with only an incoming terminal or an outgoing terminal, and an insulating part protrudes from the middle of one side wall of the housing, corresponding to the position of the first wiring port.
[0017] The circuit breaker of the present invention has a lead-out conductive component connected to the main line. The lead-out conductive component is provided with a plug-in part, which allows the circuit breaker's accessory module to be inserted into the plug-in part for mating, or the plug-in part to extend outside the outer casing for mating with the circuit breaker's accessory module. This facilitates the plug-in assembly of the circuit breaker's accessory module and the circuit breaker, replacing the existing technology of connecting the circuit breaker's accessory module and the circuit breaker with wires. This is beneficial for realizing the automated assembly of the circuit breaker's accessory module and the circuit breaker, and conforms to the modular development of circuit breakers.
[0018] In addition, the N-phase main line and one of the L-phase main lines are each led out with conductive components to facilitate the connection and power supply of accessory modules.
[0019] Furthermore, the outer casing sidewall with the first wiring port is formed by splicing a first cover plate and a second cover plate, ensuring electrical isolation between the two first wiring ports. In addition, the lead-out conductive element is connected to the coil of the short-circuit protection mechanism and extends vertically outward along the plane perpendicular to the arc-extinguishing chamber, which facilitates the insertion of accessory modules on the side of the circuit breaker and helps to shorten the length of the lead-out conductive element. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of the circuit breaker pole of the present invention;
[0021] Figure 2 This is a schematic diagram of the structure of the first housing in this invention;
[0022] Figure 3 This is a schematic diagram of the internal structure of the circuit breaker pole of the present invention;
[0023] Figure 4 This is a schematic diagram of the internal structure of the circuit breaker pole of the present invention (on the other side);
[0024] Figure 5 This is a schematic diagram of the coil structure in this invention (first embodiment);
[0025] Figure 6 This is a schematic diagram of the structure of the N-pole stationary contact in this invention;
[0026] Figure 7 This is a schematic diagram of the coil structure in the present invention (second embodiment). Detailed Implementation
[0027] The following is in conjunction with the appendix Figure 1-7 The given embodiments further illustrate specific implementations of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the descriptions of the following embodiments.
[0028] A circuit breaker includes a housing and at least one circuit breaker pole 2 disposed within the housing. Each circuit breaker pole 2 includes at least one phase main line. A first terminal 111 is provided on the side wall of the housing. At least one phase main line is connected to a lead-out conductive member 45. The lead-out conductive member 45 is provided with a plug portion 451. The plug portion 451 has a slot and is disposed opposite to the first terminal 111, and / or at least one of the plug portions 451 extends out of the housing through the first terminal 111.
[0029] The circuit breaker of the present invention has a lead-out conductive element 45 connected to the main line. The lead-out conductive element 45 is provided with a plug-in part 451, which allows the circuit breaker's accessory module to be inserted into the plug-in part 451 for engagement, or the plug-in part 451 to extend outside the outer casing for engagement with the circuit breaker's accessory module. This facilitates the plug-in assembly of the circuit breaker's accessory module and the circuit breaker, replacing the existing technology of connecting the circuit breaker's accessory module and the circuit breaker with wires. This is beneficial for realizing the automated assembly of the circuit breaker's accessory module and the circuit breaker, and conforms to the modular development of circuit breakers.
[0030] like Figure 1-7 As shown, the circuit breaker includes a housing, and at least one circuit breaker pole 2 is disposed within the housing. The housing includes at least one mounting cavity for assembling the circuit breaker pole 2. When multiple mounting cavities are disposed within the housing, the housing may include multiple partitions fixedly disposed inside the housing, with the mounting cavity formed by the gap between two adjacent partitions. Alternatively, the housing includes a top cover, a base, and partitions assembled between the top cover and the base, wherein one mounting cavity is formed by the top cover and one partition, another mounting cavity is formed by the base and another partition, and the remaining partitions are respectively paired to form multiple independent mounting cavities. Such independent mounting cavities can serve as first housings 11, and two adjacent first housings 11 can be assembled together. Thus, the housing of the circuit breaker includes multiple assembled first housings 11.
[0031] Each circuit breaker pole 2 contains one phase main line, meaning each circuit breaker pole 2 contains either an N-phase main line or a single L-phase main line. For example, a circuit breaker may have four poles, three of which are L-phase and each has a single L-phase main line and an operating mechanism; one circuit breaker pole may have an N-phase main line and an operating mechanism. Alternatively, a circuit breaker may have two poles, both of which are L-phase, or one L-phase and one N-phase. Of course, two phase main lines can also be simultaneously provided within the same circuit breaker pole 2. For example, an L-phase main line and an N-phase main line can be simultaneously provided in one circuit breaker pole, or two L-phase main lines can be simultaneously provided in one circuit breaker pole. Preferably, only one operating mechanism is provided within the same circuit breaker pole.
[0032] In this embodiment, two circuit breaker poles 2 are used as an example. Each circuit breaker pole 2 is provided with only one phase main line. That is, one circuit breaker pole 2 is used as the L pole and has an L phase main line, and the other circuit breaker pole 2 is used as the N pole and has an N phase main line. The L phase main line and the N phase main line together form the main circuit of the circuit breaker. The L pole and the N pole are assembled in the same mounting cavity, that is, the L pole and the N pole are set in the same first housing 11.
[0033] Each circuit breaker pole 2 includes a pair of terminals connected to a single phase of the main line, and a handle mechanism 21, an operating mechanism 22, and a contact mechanism connected in sequence. The pair of terminals includes an incoming terminal and an outgoing terminal. The contact mechanism is connected between the pair of terminals to control the on / off state of the single phase of the main line. The contact mechanism includes a moving contact and a stationary contact that cooperate with each other. The moving contact is linked to the operating mechanism 22, and the stationary contact is fixedly mounted on the side opposite to the moving contact. By manually operating the handle mechanism 21, the operating mechanism 22 is driven, causing the moving contact to contact or separate from the stationary contact to control the on / off state of the main line in the circuit breaker pole 2. Additionally, each circuit breaker pole 2 may also be equipped with an arc-extinguishing system and a short-circuit protection mechanism and / or overload protection mechanism 26 that cooperate with the operating mechanism 22. The arc-extinguishing system is located on one side of the contact mechanism to extinguish the arc generated by the moving contact and stationary contact during opening and closing. The short-circuit protection mechanism and / or overload protection mechanism 26 triggers the operating mechanism 22 to trip when a short circuit or overload fault occurs in the main circuit.
[0034] like Figure 1-4 As shown, the terminals of the circuit breaker pole 2 are located at at least one end of the housing. The incoming terminals (outgoing terminals) of two adjacent circuit breaker poles 2 are located at the same end of the housing. The handle mechanism 21 is rotatably mounted on the upper part of the housing (first housing 11). The operating mechanism 22 is located on one side of the handle mechanism 21. The handle mechanism 21 and the operating mechanism 22 are linked together by a linkage. The moving contact is connected to the lower part of the operating mechanism 22. The operating mechanisms 22 and handle mechanisms 21 of two adjacent circuit breaker poles are linked together. The arc extinguishing chamber 24 of the arc extinguishing system and the stationary contact are fixed in the middle of the housing (first housing 11), wherein the stationary contact and the moving contact are opposite each other.
[0035] Each circuit breaker pole 2's operating mechanism 22 includes a lever rotatably mounted inside the housing. The lever can be rotatably connected to one side wall of the housing, a partition inside the housing, or the side wall of the first housing 11. A trip latch and a lock latch are rotatably mounted on the lever. The moving contact is rotatably mounted via a contact support and is linked to the lever. One end of the trip latch and the lock latch are fastened together, and the other end of the trip latch is linked to a connecting rod. The lock latch has a linkage part with an integral rod-shaped structure. A clearance hole is provided on one side wall of the housing, a partition inside the housing, or the side wall of the first housing 11 corresponding to the linkage part. One end of the linkage part can pass through the clearance hole. An energy storage spring is mounted between the lever and the contact support. The two elastic arms of the energy storage spring abut against the contact support and the lever, respectively. Preferably, the energy storage spring is a torsion spring that is coaxially rotatably mounted with the contact support.
[0036] like Figure 3 , 4As shown, a short-circuit protection mechanism and an overload protection mechanism 26 are provided in the L pole. The short-circuit protection mechanism is located between the handle mechanism 21 and the arc-extinguishing chamber 24 of the arc-extinguishing system, with one end of the short-circuit protection mechanism opposite to the operating mechanism 22 of the L pole. The overload protection mechanism 26 is located on both sides of the operating mechanism 22 of the L pole, with one end of the overload protection mechanism 26 engaging with the operating mechanism 22. In the N pole, the short-circuit protection mechanism, arc-extinguishing system, and overload protection mechanism 26 may not be provided. Alternatively, the N pole may also include the short-circuit protection mechanism, arc-extinguishing system, and overload protection mechanism 26, adopting a structure similar to that of the L pole. Furthermore, the operating mechanisms 22 of adjacent circuit breaker poles 2 may share some parts, such as levers, contact supports, and trip latches, and the handle mechanism 21 and the latch are linked.
[0037] An accessory module is also provided on one side of one of the circuit breaker poles 2, that is, on one side of the first housing. In this embodiment, the accessory module is a leakage current protection module. Preferably, the leakage current protection module includes a second housing 12, which is spliced with a first housing 11 to form a circuit breaker with leakage current protection function. At this time, the housing includes a second housing 12 and at least one first housing 11. A leakage current detection circuit and a leakage current tripping mechanism are assembled in the second housing 12. The leakage current tripping mechanism includes a trip unit driven by the leakage current detection circuit. The leakage current detection circuit includes a circuit board and a zero-sequence current transformer connected to the circuit board. A controller is provided to drive the leakage current tripping mechanism. The zero-sequence current transformer is connected to the L-phase main line and the N-phase main line to detect leakage current signals. When the leakage current detection circuit detects a leakage current fault, it can drive the push rod of the trip unit to move. After the push rod completes its movement, a push plate and an indicator are provided on one side of the push rod of the trip unit. An avoidance hole is provided on the side wall of the second housing 12 corresponding to the push plate. The linkage part of the adjacent circuit breaker pole 2 passes through the avoidance hole and cooperates with the push plate. When a leakage current fault occurs, the trip unit triggers the push plate to rotate, causing the linkage part to drive the latch to rotate, thereby causing the operating mechanism to trip. The indicator is activated to indicate leakage current. The leakage current tripping mechanism of this embodiment can adopt existing technology.
[0038] The leakage current protection module is also equipped with a leakage current testing mechanism, which includes a leakage current testing circuit that draws power from the main circuit. The leakage current testing circuit includes a test button, a first elastic element, and a second elastic element. The test button is slidably mounted on the second housing 12. The first elastic element and the second elastic element cooperate to form a break point in the leakage current testing circuit. Pressing the test button causes the first elastic element to undergo elastic deformation to connect the break point in the leakage current testing circuit. Preferably, the leakage current testing circuit also includes a leakage current testing circuit winding of a zero-sequence current transformer connected in series. The leakage current detection winding of the zero-sequence current transformer is connected to the circuit board.
[0039] One improvement of this application is that the accessory module and the circuit breaker pole 2 are both modular structures. The assembly of the accessory module and the circuit breaker pole 2 also adopts two modular structures assembled together. That is, the leakage protection module in this embodiment adopts a modular structure. The assembly of the second housing 12 of the leakage protection module and the first housing 11 of the circuit breaker pole 2 forms the outer shell of the circuit breaker. At the same time, the leakage protection module can simultaneously draw power from the main circuit of the circuit breaker pole 2 when assembled on one side of the circuit breaker pole 2. Preferably, the leakage protection module is connected to the main circuit of the circuit breaker in a plug-in connection manner, that is, the leakage protection module is connected to the L-phase main line and N-phase main line of the circuit breaker pole 2 in a plug-in connection manner. It should be noted that, as another embodiment, the leakage protection module 3 can also draw power from the L-phase main line and N-phase main line of the circuit breaker pole 2 by contact, but the contact power drawing method is not as stable as the plug-in connection.
[0040] Specifically, a wiring port is provided on the side wall adjacent to the first housing 11 and the second housing 12. At least one lead-out conductive element 45 is connected to the L-phase main line or N-phase main line of the circuit breaker pole. A connecting piece is connected to the wiring terminal of the leakage protection module 3. The lead-out conductive element 45 and / or the connecting piece form a plug-in connection structure for accessing the main circuit through the wiring port. The lead-out conductive element 45 and / or the connecting piece of the plug-in connection structure passes through the wire hole of the zero-sequence current transformer 34.
[0041] Preferably, at least one lead-out conductive element 45 is provided with a connector 451, which corresponds to the first wiring port 111 on the side wall of the first housing 11; one end of the connecting piece forms a second plug-in portion, which passes through the wire hole of the zero-sequence current transformer 34 to form a second plug-in portion, which corresponds to the second wiring port on the side wall of the second housing 12; preferably, the second plug-in portion has a sheet-like structure, and the connector 451 is a slot that extends into the first wiring port 111, with the second plug-in portion extending out of the second housing 12 and inserted into the connector 451 for mating. Of course, as another embodiment, the connector 451 can also extend out of the first housing 11 and extend into the second housing 12 for mating. As another embodiment, the second plug-in portion on the connecting piece can also be a slot structure, and the connector 451 on the lead-out conductive element can be a sheet-like structure, with the connector 451 inserted into the second plug-in portion for mating. The plug-in connection structure formed by the connection piece and the lead-out conductive part enables the leakage protection module 3 to connect and draw power from the circuit breaker pole 2, while allowing the main circuit to pass through the wire hole of the zero-sequence current transformer 34. This eliminates the need for conductors, which helps to reduce the size of the circuit breaker. It also makes the leakage protection module 3 and the circuit breaker pole 2 two independent modules, which meets the modular development requirements of circuit breakers.
[0042] Preferably, a lead-out conductive element 45 is connected to the main circuit of the circuit breaker, that is, a lead-out conductive element 45 is connected to the N-phase main line and one of the L-phase main lines of the circuit breaker pole 2 respectively. Corresponding wiring ports of the lead-out conductive elements 45 are respectively provided on the side wall of the first housing 11 and the second housing 12 adjacent to each other. That is, the wiring ports are located on the outer shell side wall in the thickness direction of the circuit breaker pole 2, and the wiring ports are opposite to the wiring ports of the zero-sequence current transformer 34. Specifically, the wiring ports include a first wiring port 111 respectively located in the middle of the side wall of the first housing 11 and a second wiring port respectively located in the middle of the side wall of the second housing 12. The number of first wiring ports 111 can correspond to the number of lead-out conductive elements 45, and the number of second wiring ports can correspond one-to-one with the number of connecting pieces. Alternatively, the wiring ports can be located in the first housing 111... 1. Only one first wiring port 111 and one second wiring port are provided on one side of the second housing 12, so that two lead-out conductive parts 45 correspond to the same first wiring port 111, and two connecting pieces correspond to the same second wiring port of the second housing 12. In addition, the two lead-out conductive parts 45 can extend into the second housing 12 and be plugged into the two connecting pieces respectively, or the two connecting pieces can extend out of the second housing 12 and be plugged into the two lead-out conductive parts 45 respectively, or one lead-out conductive part 45 can extend into the second housing 12 and be plugged into one connecting piece, and the other connecting piece can extend out of the second housing 12 and be plugged into another lead-out conductive part 45. In this way, when the leakage protection module is plugged into the circuit breaker pole 2, the two connecting pieces can be plugged into the L-phase main line and the N-phase main line respectively to draw power. Of course, other accessory modules of the circuit breaker can also be connected to the main circuit of the circuit breaker pole 2 to draw power using this wiring method.
[0043] Preferably, each circuit breaker pole 2 includes an incoming terminal and an outgoing terminal respectively disposed at both ends of the first housing 11. A main circuit is connected between the incoming terminal and the outgoing terminal. The two terminals of the leakage current protection module are the L-pole outgoing terminal and the N-pole outgoing terminal, respectively. This structure does not affect the leakage current protection module from the main circuit of the circuit breaker pole 2, and also ensures that the normal wiring and use of the circuit breaker pole 2 will not be affected when the leakage current protection module is not spliced. After splicing the leakage current protection module 3, the outgoing terminals of the circuit breaker pole 2 can be disused, and the outgoing terminals can be blocked by a shield.
[0044] Of course, the circuit breaker pole 2 can also be provided with only the incoming terminal or the outgoing terminal. In this embodiment, the incoming terminal is provided in the circuit breaker pole 2, and the outgoing terminal is provided in the leakage protection module. That is, the L pole incoming terminal 41-1a and the N pole incoming terminal 41-2a are arranged side by side at one end of the first housing 11. The leakage protection module 3 includes two terminals provided at the same end of the second housing 12. The two terminals are the L pole outgoing terminal 41-1b and the N pole outgoing terminal 41-2b. The L phase main line of the L pole is connected between the L pole incoming terminal 41-1a and the L pole outgoing terminal 41-1b, and the N phase main line of the N pole is connected between the N pole incoming terminal 41-2a and the N pole outgoing terminal 41-2b. In this way, after the leakage protection module is spliced with the circuit breaker pole 2, the circuit breaker can be wired and used normally. This structure can save the internal space of the circuit breaker.
[0045] Furthermore, the conductive lead-out component 45 is provided with a flexible connector 451. At least one end of the first housing 11 is provided with a terminal block. Two first terminals 111 are provided on one side wall of the first housing 11. Each connector 451 is provided with a slot. Each connector 451 corresponds to one first terminal 111. That is, each connector 451 is located inside the first housing 11 and is opposite to the first terminal 111. Preferably, the slot of each connector 451 extends into one first terminal 111. Two second terminals are provided on one side wall of the second housing 12. Two connecting pieces pass through the second terminals respectively to form second plug-in portions and are plugged into one connector 451. Preferably, the slot can pass through the first terminal 111 and the second terminal 121 in sequence and be plugged into the connecting piece. Of course, the connecting piece can also pass through the second terminal 121 and the first terminal 111 in sequence and be plugged into the slot.
[0046] Furthermore, the connecting piece and / or the lead-out conductive element 45 pass through the wiring hole of the zero-sequence current transformer. Preferably, the first wiring port 111 and the second wiring port correspond to the wiring hole of the zero-sequence current transformer. At this time, the first wiring port 111 and the second wiring port are located in the middle of the side wall of the first housing 11 and the second housing 12, respectively. This can shorten the length of the connecting piece and the lead-out conductive element 45 and reduce the space occupied by them. Thus, it is preferable that the lead-out conductive element 45 is connected nearby to the components located in the middle of the L pole and N pole, such as the stationary contact of the contact mechanism, the short-circuit protection mechanism, etc. In this embodiment, the short-circuit protection mechanism is located in the middle of the first housing 11, and the zero-sequence current transformer... Located in the middle of the second housing 12, the short-circuit protection mechanism corresponds to the zero-sequence current transformer. Preferably, the lead-out conductive element 45 of the L pole is connected to the short-circuit protection mechanism, and the lead-out conductive element 45 of the N pole is connected to the contact mechanism of the N pole. That is, the first wiring port 111 is located on the side wall of the housing corresponding to the short-circuit protection mechanism or the position corresponding to the stationary contact. The second wiring port is located on the side wall of the second housing 12 corresponding to the wire hole of the zero-sequence current transformer 34. At the same time, the first wiring port 111 corresponds to the second wiring port, and the first wiring port 111 also corresponds to the zero-sequence current transformer. This arrangement can shorten the length of the lead-out conductive element and the wiring piece, which is conducive to plugging and mating.
[0047] Correspondingly, the leakage current test circuit of the leakage current protection module draws power from the main circuit. Preferably, the second elastic element serves as one power-drawing terminal of the leakage current test circuit and is electrically connected to the L-phase output terminal, allowing the leakage current test circuit to draw power from the L-phase main line. The other power-drawing terminal of the leakage current test circuit draws power directly or indirectly through an electrical connection to the N-phase output terminal. The first end of the first elastic element is connected to the zero-sequence current transformer, and the second end of the first elastic element cooperates with the second end of the first elastic element to form a break point. Thus, the second elastic element can both form a break point for the leakage current test circuit and be used to draw power for the leakage current test circuit, which helps to reduce the number of wires used. In addition, the circuit board in the leakage current detection circuit also draws power through the second elastic element. A third elastic element is also connected to the circuit board, and the second end of the third elastic element serves as one power-drawing terminal of the circuit board and is connected to the second terminal block. Therefore, while the circuit board draws power from the main circuit, it can also reduce the number of power-drawing wires, improve space utilization, and help to reduce the size.
[0048] Furthermore, the zero-sequence current transformer in the leakage current protection module uses pins for its wiring terminals, which allows for wiring of the zero-sequence current transformer through plug-in connection. Compared with the existing method of using wires for power supply, this method has the advantages of convenient wiring and fewer wires required.
[0049] Combination Figure 1-7 A first embodiment is provided, in which the circuit breaker pole 2 and the leakage current protection module are plugged in, and both terminals are located inside the second housing 12. For example... Figure 1-4As shown, in the L pole, an L pole input terminal 41-1a is provided at one end of the L pole, that is, an L pole input terminal 41-1a is provided at one end of the first housing 11. The contact mechanism of the L pole includes an L pole moving contact and an L pole stationary contact 231. The L pole moving contact is electrically connected to the L pole input terminal 41-1a. The L pole stationary contact 231 is fixed to one side of the arc-extinguishing chamber 24. A short-circuit protection mechanism is provided between the arc-extinguishing chamber 24 and the handle mechanism 21. The short-circuit protection mechanism includes a coil assembly, which includes a coil frame and a coil wound around the outside of the coil frame. The coil 25 has its second terminal connected to the L-pole stationary contact 231. The first terminal 251 of the coil 25 is connected to a connecting plate. The connecting plate serves as the L-pole lead-out conductive element 45, extending outward in a direction perpendicular to the plane of the arc-extinguishing chamber 24. The connecting plate is arranged along the thickness direction of the circuit breaker pole 2. In the figure, the connecting plate is arranged along the gap between the short-circuit protection mechanism and the arc-extinguishing chamber 24. The end of the connecting plate away from the first terminal 251 is provided with a connector 451, that is, the end near the L-pole stationary contact 231 is provided with a connector 451.
[0050] The N pole and L pole are arranged side by side in the same first housing 11. An N pole input terminal 41-2a is provided at one end of the N pole, meaning the L pole input terminal 41-1a and the N pole input terminal 41-2a are arranged side by side at one end of the first housing 11. The N pole contact mechanism includes an N pole moving contact and an N pole stationary contact 232, wherein the N pole stationary contact 232 is arranged side by side with the L pole stationary contact 231. The stationary contact plate of the N pole stationary contact 232... Figure 3 , 4The circuit breaker is positioned horizontally. The stationary contact plate of the N-pole stationary contact 232 corresponds to the gap between the coil assembly of the L-pole and the arc-extinguishing chamber 24. A conductive lead-out element 45 extends outward from the middle side of the stationary contact plate of the N-pole stationary contact 232. The N-pole and L-pole conductive lead-out elements 45 extend side-by-side towards one side of the first housing 11. That is, the N-pole conductive lead-out element 45 extends along a plane perpendicular to the arc-extinguishing chamber 24 towards the side closer to the second housing 12. In other words, the N-pole conductive lead-out element extends along the thickness direction of the circuit breaker pole 2. Each conductive lead-out element 45 extends into a corresponding first terminal 111. The insertion portion 451 is provided with a slot extending beyond the first terminal 111. Of course, the slot is located... The first wiring port 11 can be located either inside the first housing 11 or within the first wiring port 111. Preferably, the housing sidewall with the first wiring port 111 is provided, meaning one sidewall of the first housing 11 includes a first cover 13 and a second cover 14 that are spliced together. One of the first wiring ports 111 is located at the splice between the first cover 13 and the second cover 14. This spliced structure helps to ensure electrical clearance and insulation between the two first wiring ports 111. Furthermore, an insulating part 112 protrudes from the lower edge of each first wiring port 111. The insulating part 112 serves as insulation to prevent short circuits between two adjacent conductive leads 45, and also acts as a guide for insertion in conjunction with the second wiring port. The insulating part 112 is provided corresponding to the first wiring port 111 and protrudes from the housing sidewall. The insulating part 112 can be provided only on the lower edge of the first wiring port 111, or it can be provided around the first wiring port 111.
[0051] In this embodiment, the connector 451 is as follows: Figure 5 , 6 As shown, it includes a first contact piece and a second contact piece. One end of the second contact piece is bent and connected to the first contact piece, and the other end of the second contact piece is spaced apart from the first contact piece, so that the gap between the first contact piece and the second contact piece forms a slot. In the figure, the first contact piece has a straight plate structure. Figure 6 The first contact piece is formed by the stationary contact plate of the N-pole stationary contact 232. Figure 5 In this design, the first contact piece is a connecting plate connected to the first terminal 251 of the coil 25, which saves space occupied by the slot and reduces costs. The middle part of the second contact piece is bent and moves closer to the first contact piece, making the middle gap of the slot the narrowest. The plug part 451 is similar to a hairpin shape, which facilitates the flexible plugging and matching of the second plug part with the first terminal piece and the second terminal piece, which helps to maintain stable wiring.
[0052] In the leakage protection module, a button slot is provided on the upper part of the second housing 12. Two terminals are arranged side by side at one end of the second housing 12. A connecting piece is connected to each terminal. One terminal serves as the L pole output terminal, and the connecting piece connected to the L pole output terminal is the first connecting piece. The other terminal serves as the N pole output terminal, and the connecting piece connected to the N pole output terminal is the second connecting piece. The first connecting piece is connected to the L pole lead-out conductive element 45, and the second connecting piece is connected to the N pole lead-out conductive element 45. At this time, one end of the entire circuit breaker housing is provided with an L pole input terminal 41-1a and an N pole input terminal 41-2a, and the other end of the housing is provided with an L pole output terminal and an N pole output terminal.
[0053] Two second wiring ports are provided on the side wall of the second housing 12 facing the first housing 11. Zero-sequence current transformers are installed at the positions corresponding to the second wiring ports. A circuit board is provided on the side of the zero-sequence current transformer away from the wiring terminals. Preferably, an arc-shaped recessed area is formed on one edge of the circuit board, and the zero-sequence current transformer is correspondingly installed within this arc-shaped recessed area. A socket is provided on the circuit board adjacent to the arc-shaped recessed area. A test button is slidably installed in a button slot. A first elastic element is located between the test button and the zero-sequence current transformer. A second elastic element is fitted to one side of the first elastic element and... Located above the zero-sequence current transformer, the second ends of the first elastic element and the second ends of the second elastic element are spaced apart to form a break. The test button abuts against the middle of the first elastic element. The first end of the second elastic element is plugged into the circuit board. The second end of the second elastic element is connected to the first terminal block for power supply. The break is formed by the spaced apart middle of the second elastic element and the second end of the first elastic element. The first end of the first elastic element is connected to the zero-sequence current transformer. Specifically, the first end of the first elastic element is connected to the fourth pin of the zero-sequence current transformer, preferably with the fourth pin positioned close to the first elastic element. A third elastic element is connected to the circuit board, which is used to electrically connect the circuit board to the N-pole output terminal.
[0054] The zero-sequence current transformer includes an iron core and a leakage current test circuit winding and a leakage current detection winding wound around the outside of the iron core. A wire hole is provided in the middle of the iron core, and an electrical isolation plate is provided in the wire hole. The electrical isolation plate divides the wire hole into a first wire hole and a second wire hole that are parallel to each other. Preferably, the first wire hole and the second wire hole correspond one-to-one with two second terminals. The first terminal piece and the second terminal piece pass through the two second terminals to form two parallel second plug-in parts. The two second plug-in parts are plugged into the plug-in parts 451 of the two lead-out conductive parts 45. The electrical isolation plate realizes the electrical isolation between the first terminal piece and the second terminal piece.
[0055] The leakage current test circuit winding includes a third pin and a fourth pin. The fourth pin abuts against the first elastic element, and the third pin is inserted into the circuit board. The leakage current detection winding includes a first pin and a second pin. The first pin and the second pin are respectively connected to the circuit board. The first pin, the second pin, and the third pin are located on the same side of the iron core, and the fourth pin is located on the other side of the iron core. That is, the first pin, the second pin, and the third pin all extend side by side along the radial direction of the iron core, and the fourth pin extends outward along the tangential direction of the iron core, so that the fourth pin is located on the side closer to the first elastic element. The arc-shaped recessed area of the circuit board is provided with sockets for inserting the first pin, the second pin, and the third pin. The first pin, the second pin, and the third pin of the zero-sequence current transformer can be soldered to the circuit board.
[0056] The first terminal block includes an L-shaped conductive plate and a second conductive plate. One end of the conductive plate serves as the first end of the first terminal block and is connected to an N-pole output terminal or an L-pole output terminal. The first end of the first terminal block is connected to the L-pole output terminal. The other end of the conductive plate extends outward along the direction away from the conductive plate to form an L-shaped extension plate. A first abutment groove is provided on the side of the L-shaped extension plate. The L-shaped extension plate bends upward and extends. A first abutment groove is provided on the side of the L-shaped extension plate. The first end of the second elastic member elastically abuts against the first abutment groove. The elastic abutment between the second elastic member and the first abutment groove has the advantages of convenient wiring, eliminating the need for wires and occupying little space. One end of the second conductive plate is connected to the middle of the extension plate. The other end of the second conductive plate passes through the wire hole of the current transformer. The surfaces of the extension plate and the second conductive plate are attached to the side of the zero-sequence current transformer away from the second terminal.
[0057] The second connecting piece has an L-shaped plate structure. The second connecting piece is vertically positioned between the terminal block and the circuit board and is attached to the side of the zero-sequence transformer facing away from the second terminal. A second abutment groove is provided on the first end side of the second connecting piece. The second end of the third elastic member abuts against the second abutment groove. The third elastic member is preferably a torsion spring. In addition, the first end of the second connecting piece is connected to the N pole output terminal through a wire. Preferably, a conductive plate is also connected between the wire and the N pole output terminal. The second end of the second connecting piece passes through the second wire hole of the zero-sequence transformer and a second terminal of the second housing 12 in sequence to form a second plug-in part.
[0058] Combination Figure 1 , 7A second embodiment is provided, in which one lead extends to the outside of the second housing 12 and is plugged into a lead-out conductive member 45, and another lead-out conductive member 45 extends to the second housing 12 and is plugged into another lead. That is, the plug portion 451 of one lead-out conductive member extends out of the first housing 11 through the first terminal 111 and is plugged into another lead inside the second housing 12.
[0059] The L pole and N pole are assembled together in the same first housing 11 as in the first embodiment, wherein the L pole and N pole are arranged side by side. The N pole includes the same N pole input terminal 41-2a, N pole contact mechanism, and lead-out conductive element 45 connected to the N pole stationary contact 232 as the above-mentioned N pole. The L pole includes the same L pole input terminal 41-1a, arc-extinguishing chamber 24, L pole contact mechanism, short-circuit protection mechanism, and overload protection mechanism 26 as the above-mentioned L pole. Unlike the above-mentioned L pole, the first terminal 251 of the coil 25 serves as the lead-out conductive element 45 of the L pole. Preferably, the first terminal 251 of the coil 25 is also perpendicular to the plane where the arc-extinguishing chamber 24 is located. The first terminal 251 extends outward along the thickness direction of the circuit breaker pole 2. The first terminal 251 of the coil 25 extends outward from a first terminal 111 of the first housing 11 and extends into the second housing 12. A conductive area is formed at the end of the first terminal 251 of the coil 25. The conductive area can be used as a plug-in part 451 to be plugged into the first terminal piece of the leakage protection module. Preferably, the conductive area is formed by peeling off the insulation layer of the enameled wire. At this time, the first terminal 251 of the coil 25 passes through the first terminal 111. After the conductive area passes through the first terminal 111 and extends out of the housing, it can be used as a plug-in part 451.
[0060] The leakage current protection module is assembled in a second housing 12 with the same structure as the first embodiment. The leakage current protection module includes an L-pole output terminal, an N-pole output terminal, a zero-sequence transformer, and a circuit board, all identical to those in the previous leakage current protection module. The second connecting piece connected to the N-pole output terminal is identical to the second connecting piece in the first embodiment. A third elastic element connects between the circuit board and the second connecting piece, with its second end abutting against the second abutting groove of the second connecting piece. Unlike the previous leakage current protection module, the first connecting piece connected to the L-pole output terminal no longer passes through the wire hole of the zero-sequence transformer. Instead, the first connecting end 251 of the coil 25 passes through the first wire hole of the zero-sequence transformer, and the first connecting piece is inserted into the conductive area of the first connecting end 251. Additionally, a test button, a first elastic element, and a second elastic element are also provided above the zero-sequence transformer. The first elastic element is connected to the zero-sequence transformer, one end of the second elastic element is connected to the circuit board, and the second elastic element connects to the conductive area of the first connecting end 251 for power supply.
[0061] The first connecting piece includes an L-shaped conductive plate. One end of the conductive plate serves as the first end of the first connecting piece and is connected to a terminal (L-pole output terminal). The other end of the conductive plate extends outward in a direction away from the conductive plate to form an extension plate. The surface of the extension plate is arranged along the side of the zero-sequence current transformer facing away from the second terminal. The extension plate serves as the second end of the first connecting piece. The surface of the extension plate forms a certain angle with the surface of the conductive plate. Preferably, the surface of the extension plate is perpendicular to the surface of the conductive plate. A first abutment groove is formed on the side of the extension plate. Preferably, the first abutment groove... The slot is located on the lower edge of the extension plate. The first terminal 251 of the coil 25 can be inserted into the first abutting slot. The conductive area of the first terminal 251 abuts with the first abutting slot, so that the L-phase main line between the leakage protection module and the L pole is connected. The first terminal 251 can be regarded as the plug part 451 extending into the second housing 12. The conductive area of the first terminal 251 of the coil 25 abuts with the first abutting slot. The conductive area abuts with the first abutting slot 421. It has the advantages of convenient wiring, omitting wires and occupying little space.
[0062] In the third embodiment, when both terminals extend out of the second housing 12, the two terminals extend into the first housing 11 by passing through the second terminal 121 and the first terminal 111 in sequence. That is, the two terminals pass through the first and second wiring holes of the zero-sequence current transformer 34 respectively and are then plugged into the two lead-out conductive parts. Preferably, in this embodiment, the insertion part 451 is disposed on the two terminals, and the second insertion part is disposed on one end of the lead-out conductive part. The insertion part 451 can be selected from the same slot as in the above embodiment. The contact part 451 includes two spaced-apart first contact pieces and second contact pieces. Of course, the structure of the insertion part 451 and the second insertion part is a matching concave-convex structure, and its specific structure is not limited to the structure described above.
[0063] In addition, when the circuit breaker includes three L poles, one N pole, and a leakage current protection module, one L pole and one N pole can be jointly assembled in a first housing 11 adjacent to the leakage current protection module. In this case, the leakage current protection module and the L pole and N pole adopt the connection method of the above three embodiments. Alternatively, the three L poles and one N pole are respectively assembled in four first housings 11, and one of the lead-out conductive members 45 can pass through the adjacent first housing 11, so that two lead-out conductive members 45 eventually extend side by side to the middle of the same side wall of the same first housing 11. The leakage current protection module can adopt the structure of the above three embodiments.
[0064] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.
[0065] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.
Claims
1. A circuit breaker, comprising a housing and at least one circuit breaker pole (2) disposed within the housing, each circuit breaker pole (2) comprising at least one phase main line, characterized in that: The outer casing has a first wiring port (111) on its side wall, and at least one phase of the main line is connected to a lead-out conductive component (45), which has a plug-in portion (451). The connector (451) has a slot and is disposed opposite to the first terminal (111), and / or at least one of the connectors (451) extends out of the housing through the first terminal (111); The circuit breaker pole (2) is only provided with an incoming terminal. The circuit breaker includes two circuit breaker poles (2), one of which is an L pole and the other is an N pole. The L pole includes an L pole input terminal (41-1a), an L pole contact mechanism, and a short-circuit protection mechanism. The L pole contact mechanism includes an L pole moving contact and an L pole stationary contact (231). The L pole moving contact is electrically connected to the L pole input terminal (41-1a), and the L pole stationary contact (231) is connected to the second terminal of the coil (25) of the short-circuit protection mechanism. The first terminal (251) of the coil (25) of the coil assembly serves as the lead-out conductive element (45). Alternatively, the first terminal (251) of the coil (25) is connected to a connecting plate, which serves as the lead-out conductive element (45). The N pole includes an N pole input terminal (41-2a) and an N pole contact mechanism. The N pole contact mechanism includes an N pole moving contact and an N pole stationary contact (232). The N pole moving contact is electrically connected to the N pole input terminal (41-2a). Another lead-out conductive element (45) is connected to the stationary contact plate of the N-pole stationary contact (232), and the lead-out conductive elements (45) of the L-pole and N-pole are arranged side by side and extend in the same direction.
2. The circuit breaker according to claim 1, characterized in that: Two first wiring ports (111) are provided side by side on one side wall of the housing.
3. The circuit breaker according to claim 2, characterized in that: The outer casing sidewall with a first connection port (111) includes a first cover (13) and a second cover (14) that are spliced together, wherein the first connection port (111) is located at the splice between the first cover (13) and the second cover (14).
4. The circuit breaker according to claim 1, characterized in that: The connector (451) includes a first contact piece and a second contact piece. One end of the second contact piece is bent and connected to the first contact piece, and the other end of the second contact piece is spaced apart from the first contact piece, so that a slot is formed between the first contact piece and the second contact piece.
5. The circuit breaker according to claim 1, characterized in that: The connecting plate has a connector (451) at one end near the L-pole stationary contact (231).
6. The circuit breaker according to claim 1, characterized in that: An insulating part (112) is provided in the middle of one side wall of the outer casing, corresponding to the first wiring port (111).
7. The circuit breaker according to claim 1, characterized in that: A leakage protection module is also provided on one side of one of the circuit breaker poles (2). The outgoing terminals of the circuit breaker are located in the leakage protection module. The leakage protection module includes an L pole outgoing terminal (41-1b), an N pole outgoing terminal (41-2b), a leakage detection circuit, and a leakage tripping mechanism. The leakage tripping mechanism includes a trip unit driven by the leakage detection circuit. The leakage detection circuit includes a circuit board and a zero-sequence current transformer connected to the circuit board. The L phase main line of the L pole is connected to the L pole incoming line. Between terminal (41-1a) and L pole output terminal (41-1b), the N-phase main line of N pole is connected between N pole input terminal (41-2a) and N pole output terminal (41-2b). L pole output terminal (41-1b) is connected with a connecting piece. The lead-out conductive element (45) and the connecting piece form a plug-in connection structure for accessing the main circuit through the wiring port. The lead-out conductive element (45) and / or connecting piece of the plug-in connection structure pass through the wire hole of the zero sequence transformer (34).
Citation Information
Patent Citations
Residual current circuit breaker
CN201725756U
Residual current operated circuit breaker
CN213242414U
Circuit breaker
CN218385046U