A large-current miniature circuit breaker and an electromagnetic system thereof

Abstract

The application relates to the field of circuit breakers, in particular to a large-current small-sized circuit breaker and an electromagnetic system thereof, which comprises a static contact plate, two limiting plates are arranged on the static contact plate, a cylinder seat is clamped between the limiting plates, an iron core assembly is slidably arranged in the cylinder seat, a spiral coil is spirally wound on the cylinder seat, one end of the spiral coil is electrically connected to the static contact plate, a first wiring plate is electrically connected to the other end of the spiral coil, the spiral coil comprises a coil main body wound on the cylinder seat and a coil head electrically connected to the static contact plate or the first wiring plate, a first gap is formed between the coil main body and the static contact plate, a second gap is formed between the end of the coil main body and the end of the corresponding limiting plate, a shunt wire is electrically connected between the static contact plate and the first wiring plate, the shunt wire passes through the first gap and the second gap and is wound on the cylinder seat along the winding direction of the coil main body. The application has the effect of reducing the temperature rise generated by the current without reducing the number of turns of the spiral coil.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit breaker, in particular to a large current small circuit breaker and its electromagnetic system. BACKGROUND

[0002] The circuit breaker refers to a switch device capable of closing, carrying and opening the current under normal circuit conditions and capable of closing, carrying and opening the current under abnormal circuit conditions within a specified time.

[0003] The circuit breaker usually comprises an electromagnetic system, an arc extinguishing system, a tripping system, an operating system, a contact system and a shell, the shell is provided with a connecting plate for incoming and outgoing wires, the connecting plate is electrically connected with the wires, the connecting plate is electrically connected with the electromagnetic system through the contact system, and the contact system is arranged on the tripping system to control the contact system so as to control the conduction and disconnection between the connecting plate and the electromagnetic system. The electromagnetic system comprises a slidingly arranged iron core assembly and a spiral coil wound on the outer circle of the iron core assembly, the two ends of the spiral coil are electrically connected with the contact system corresponding to the incoming and outgoing wires of the connecting plate, when a short circuit occurs, the suddenly increased current will flow through the spiral coil, so that the magnetic field intensity generated by the spiral coil makes the iron core assembly slide to trigger the tripping system, thereby disconnecting the circuit to play a protection role.

[0004] The electromagnetic system comprises a static contact plate for electrical connection with the spiral coil, the contact system usually comprises a static contact and a moving contact plate, the static contact is electrically connected to the static contact plate, and the moving contact plate is rotatably arranged on the inner wall of the shell. The rotation of the moving contact plate is controlled by the tripping system and the operating system, that is, when the user controls the operating system to be in the closed state, the moving contact plate is rotated to be electrically connected to the static contact at one end and to the connecting plate at the other end. When a short circuit occurs, the iron core assembly slides to actuate the tripping system, and the tripping system controls the rotation of the moving contact plate to disconnect the circuit, so as to disconnect the electrical connection between the static contact.

[0005] According to the related technology in the above, the inventors believe that there are the following defects: when the small circuit breaker carries a large current (such as 100A, 125A), the increase in the cross-sectional area of the spiral coil is required to reduce the temperature rise caused by the current passing through. However, since the volume of the cavity inside the shell does not change, the number of turns of the spiral coil needs to be reduced while increasing the cross-sectional area of the spiral coil. Since the number of turns of the spiral coil is reduced, the field intensity is weakened. Therefore, when a short circuit occurs, the sliding force of the iron core assembly is insufficient to trigger the tripping system to disconnect the circuit (i.e., the short-circuit breaking capacity is insufficient). SUMMARY

[0006] In order to improve the problem of insufficient short-circuit breaking capacity caused by reducing the temperature rise of the spiral coil, the present application provides a large current small circuit breaker and its electromagnetic system.

[0007] The application provides a large-current small circuit breaker and an electromagnetic system thereof.

[0008] The electromagnetic system of the large-current small circuit breaker comprises a static contact plate, at least two limiting plates are arranged on the static contact plate, a cylinder seat is clamped and connected between the limiting plates, an iron core assembly for driving a trigger tripping system is slidably arranged in the cylinder seat, a spiral coil is spirally arranged on the cylinder seat, one end of the spiral coil is electrically connected to the static contact plate, a first wiring plate is electrically connected to the other end of the spiral coil, the spiral coil comprises a coil body wound on the cylinder seat and a coil head electrically connected to the static contact plate or the first wiring plate, a first gap is formed between the side wall of the coil body and the side wall of the static contact plate, a second gap is formed between the end of the coil body and the end of the corresponding limiting plate, and a shunt wire is further electrically connected between the static contact plate and the first wiring plate.

[0009] By adopting the above technical scheme, since the coil body is wound on the cylinder seat and the static contact plate is in the form of a straight plate, the first gap is formed between the side wall of the coil body and the end of the static contact plate, and the shunt wire is passed through the first gap, which does not increase the occupied volume of the electromagnetic system and also plays a shunt role, thereby ensuring the number of turns of the spiral coil wound on the cylinder seat, reducing the influence on the magnetic field, shunting the current in the coil body through the shunt wire, reducing the temperature rise of the coil body, winding the shunt wire on the cylinder seat through the second gap and in the winding direction of the coil body, so that the large current passes through the shunt wire when a short circuit occurs, the magnetic field generated by the shunt wire is in the same direction as the magnetic field generated by the coil body, the magnetic fields generated by the shunt wire and the coil body are superimposed on each other, the magnetic field is more concentrated and has a greater intensity, thereby accelerating the driving of the iron core assembly to the tripping system to make the circuit breaker trip, and the rising of the circuit breaking current is limited; by increasing the shunt wire and the winding mode of the shunt wire, the small circuit breaker can be used in a large-current circuit, and the cost of developing a new circuit breaker by opening a new mold is reduced.

[0010] Optionally, an insulating ring is arranged on the end of the cylinder seat, the insulating ring is located between the limiting plate and the shunt wire, and the insulating ring is used for separating the limiting plate and the shunt wire.

[0011] By adopting the technical scheme, the shunt conductor in the second gap is separated from the limiting plate by insulation, the part of the shunt conductor wound on the cylinder seat in the second gap is directly electrically connected with the limiting plate, thereby the current in the shunt conductor directly flows into the limiting plate without flowing around the cylinder seat, the probability of affecting the generated magnetic field is reduced, and the working process of the shunt conductor generating the magnetic field is more stable.

[0012] Optionally, the static contact plate is provided with a giving slot, a first limiting plate is rotatably arranged on the inner wall of the giving slot, a sliding slot is formed in the inner wall of the giving slot, a second clamping plate is rotatably arranged on the end of the first clamping plate, and an insertion block for being inserted into the sliding slot and sliding is arranged on the end of the second clamping plate, so that the position where the first clamping plate and the second clamping plate are rotatably connected is arched to pass the shunt conductor and clamp the shunt conductor.

[0013] By adopting the technical scheme, when installing, the second clamping plate is pushed to arch the connection between the second clamping plate and the first clamping plate, and then the shunt conductor is passed through, and the shunt conductor is clamped by the second clamping plate and the first clamping plate, thereby improving the stability of the shunt conductor, and the worker can first pre-install the shunt conductor through the first clamping plate and the second clamping plate, and then weld the shunt conductor, which facilitates installation and reduces the probability of displacement of the shunt conductor during re-welding.

[0014] Optionally, the cylinder seat comprises a limiting cylinder and a static iron core, the limiting cylinder and the static iron core are sleeved and clamped with each other, the iron core assembly comprises a moving iron core sliding in the limiting cylinder, a through slot is formed in the static iron core, a trigger rod penetrates and slides in the through slot, the moving iron core is used to slide and drive the trigger rod, a return spring is arranged in the through slot, the other end of the return spring is driven on the moving iron core, the return spring stretches and contracts along the sliding direction of the moving iron core in the limiting cylinder, a control ring is threadedly connected in the through slot, and a through slot for the return spring to pass through is formed in the control ring.

[0015] By adopting the technical scheme, when the circuit is short-circuited, the static iron core drives the dynamic iron core to slide in the limiting cylinder, at this time, the dynamic iron core needs to overcome the elastic force of the reset spring to slide, and the different current of the small current and the large current leads to different magnetic field, so that the magnetic force between the static iron core and the dynamic iron core is different; when the reset spring is not stressed, the staff can displace the control ring in the through groove by rotating the control ring, so as to adjust the length of the reset spring between the control ring and the dynamic iron core, at this time, if the dynamic iron core compresses the reset spring, since the reset spring in the form of a spiral is inserted into the through slot, the compression of the reset spring will be resisted on the inner wall of the through slot, so that the pressure of the end of the reset spring on the inner wall of the through slot is transferred to the pressure between the reset spring and the control ring, at this time, only the reset spring between the control ring and the dynamic iron core is compressed, due to the effect of the control ring, the pressure is difficult to be transmitted to the reset spring between the control ring and the bottom wall of the through groove, and the reset spring between the control ring and the bottom wall of the through groove is still in a balanced state, so that by adjusting the control ring, the elastic force coefficient that the dynamic iron core needs to overcome when sliding can be adjusted, and by adjusting the position of the control ring, the dynamic iron core can adapt to the circuit of small current or large current, so that the range of the dynamic iron core that can be applied is greatly expanded.

[0016] Optionally, the control ring and the through groove are provided with corresponding insertion grooves, corresponding insertion pins are inserted in the insertion grooves, a limiting groove is formed in the inner wall of the limiting cylinder, and a limiting block for being inserted in and sliding in the limiting groove is arranged on the static iron core and the dynamic iron core.

[0017] By adopting the technical scheme, the control ring is limited by inserting the insertion pin into the corresponding insertion groove, so that when the reset spring is stressed to drive the control ring, the probability that the control ring rotates in the through groove and the position of the control ring moves is reduced, and the stability of the control ring is improved, and the rotation of the static iron core and the dynamic iron core is limited by inserting the limiting block into the limiting groove to slide, so that when the dynamic iron core or the static iron core is compressed, the rotation of the dynamic iron core or the static iron core is reduced, so that the reset spring is twisted, the reset spring between the control ring and the dynamic iron core is transferred to the reset spring between the control ring and the bottom wall of the through groove, so that the probability that the pressure of the reset spring between the control ring and the dynamic iron core is released is reduced, and the stability of the reset spring when being compressed is improved.

[0018] Optionally, a large-current small circuit breaker comprises a shell and a contact system, a second terminal plate for electrically connecting with an external wire is arranged on the inner wall of the shell, the contact system comprises a movable contact rotating on the inner wall of the shell and a static contact electrically connected to a static contact plate, a thermal element is electrically connected to the second terminal plate, when the movable contact is in a closed state, the two ends of the movable contact are respectively in contact with the other end of the thermal element and the static contact, the thermal element is used to deform to release the electrical connection with the movable contact when an overload occurs, a first wire is electrically connected to the second terminal plate and the movable contact, a second wire is electrically connected to the thermal element and the movable contact.

[0019] By adopting the above technical scheme, the current between the second terminal plate and the thermal element is shunted by the first wire, and the current on the thermal element is directly shunted to the movable contact by the second wire, so that the thermal element is shunted by double shunting, the amount of current shunted to the thermal element is reduced, and the probability that the circuit normally turned on is disconnected due to the excessive temperature of the thermal element caused by the excessive current when the current does not reach the overload is reduced, so that the thermal element is adapted to the circuit with large current, the thermal element is adapted to the circuit with large current by increasing the first wire and the second wire, the research and development cost is greatly reduced, and the cost is saved without re-opening the mold.

[0020] Optionally, the first wire and the second wire are attached to the inner wall of the shell, and a heat dissipation groove for heat dissipation is formed in the inner wall of the shell at the attachment position of the first wire and the second wire.

[0021] By adopting the above technical scheme, the cross-sectional area of the first wire and the second wire is considered to reduce the resistance, so as to reduce the temperature rise, so that the first wire and the second wire are attached to the inner wall of the shell, and more space is provided to increase the cross-sectional area of the first wire and the second wire; the part of the first wire and the second wire tightly attached to the inner wall of the shell is attached to the inner wall of the shell, so that heat is difficult to dissipate, resulting in poor heat dissipation of the first wire and the second wire; at this time, the first wire and the second wire are suspended on the opening surface of the heat dissipation groove, so that the heat of the part of the first wire and the second wire attached to the inner wall of the shell enters the heat dissipation groove, and the heat dissipation groove dissipates the heat from the position not covered by the first wire and the second wire to the inside of the shell, thereby improving the heat dissipation capacity of the first wire and the second wire, reducing the temperature rise of the first wire and the second wire, and achieving the purpose of reducing the temperature rise.

[0022] Optionally, transverse and longitudinal reinforcing ribs are arranged on the bottom wall of the heat dissipation groove to strengthen the structural strength of the shell.

[0023] By adopting the above technical solution, by arranging transverse and longitudinal reinforcing ribs on the bottom wall of the heat dissipation groove, the bearing capacity of the inner wall of the shell of the bottom wall of the heat dissipation groove under transverse and longitudinal forces is improved, and the structural soundness of the side wall of the shell is improved, thereby reducing the impact of the heat dissipation groove on the inner wall of the shell on the structural strength of the side wall of the shell.

[0024] Optionally, the first wire and the second wire are attached to the transverse reinforcing ribs and span across the opening surface of the heat dissipation slot, and the longitudinal reinforcing ribs are located between the first wire and the second wire and penetrate and connect a plurality of transverse reinforcing ribs.

[0025] By adopting the above technical solution, by arranging the longitudinal reinforcing rib between the first wire and the second wire, the contact area between the longitudinal reinforcing rib and the first wire or the second wire is reduced, thereby reducing the influence of the longitudinal reinforcing rib on the heat dissipation capacity of the first wire and the second wire. The first wire and the second wire are supported by the transverse reinforcing rib, making it difficult for the first wire and the second wire to directly adhere to the bottom wall of the heat dissipation slot, reducing the probability that the first wire and the second wire adhere to the bottom wall of the heat dissipation slot, so that the side walls of the first wire and the second wire are still adhered, resulting in difficulty in heat dissipation. This ensures the working state of the first wire and the second wire suspended at the opening surface of the heat dissipation slot, thereby ensuring the heat dissipation capacity of the first wire and the second wire.

[0026] Optionally, a pre-installed groove is provided on the transverse reinforcing rib, and the pre-installed groove is used for the first wire and the second wire to be embedded therein so as to limit the position of the first wire and the second wire.

[0027] By adopting the above technical solution, when the staff needs to install the first wire and the second wire, they can first embed the first wire and the second wire in the pre-installed groove, limit the position of the first wire and the second wire by clamping the inner wall of the pre-installed groove, and then weld the first wire and the second wire. This reduces the probability of the first wire and the second wire being offset and displaced during the welding process, resulting in the need for re-welding, and makes the installation of the first wire and the second wire smoother.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The electromagnetic system does not increase the occupied volume, plays a role of shunt, ensures the number of turns of the spiral coil wound on the cylinder seat, reduces the influence on the magnetic field, and reduces the temperature rise of the coil main body; the magnetic field direction generated by the shunt wire is the same as the magnetic field direction generated by the coil main body, so that the magnetic fields generated by the shunt wire and the coil main body are superimposed on each other, the magnetic field is more concentrated and stronger, thereby accelerating the iron core assembly to drive the trip system to make the circuit breaker trip, limiting the rise of the breaking current; by increasing the shunt wire and the winding mode of the shunt wire, the small circuit breaker can be used in a large current circuit, and the cost of developing a new circuit breaker by opening a new mold is reduced.

[0030] 2. By adjusting the position of the control ring, the moving iron core can adapt to a small current or a large current circuit, greatly expanding the range of the moving iron core.

[0031] 3. By increasing the first wire and the second wire, the thermal element can adapt to a large current circuit, greatly reducing the development cost, so that the mold does not need to be opened again, saving the cost; by opening the heat dissipation groove, the temperature rise of the first wire and the second wire is reduced, achieving the purpose of reducing the temperature rise. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the overall structure of an electromagnetic system of a large-current small circuit breaker in embodiment 1.

[0033] Figure 2 is a schematic diagram of the overall structure of an electromagnetic system of a large-current small circuit breaker in embodiment 1. Figure 1 is a sectional view along line A-A in

[0034] Figure 3 is a schematic diagram of the structure highlighting the second gap.

[0035] Figure 4 is a schematic diagram of the overall structure of an electromagnetic system of a large-current small circuit breaker in embodiment 2.

[0036] Figure 5 is a schematic diagram of the structure highlighting the accommodation groove.

[0037] Figure 6 is an enlarged schematic diagram of B in Figure 5

[0038] Figure 7 is an exploded structure diagram of the cylinder seat.

[0039] Figure 8 is a sectional view along line C-C in Figure 4

[0040] Figure 9 is a schematic diagram of the overall structure of an electromagnetic system of a large-current small circuit breaker in embodiment 1. Figure 8 ​​An enlarged structural schematic view at D.

[0041] Figure 10 is Figure 7 An enlarged structural schematic view at E.

[0042] Figure 11 is a structural schematic view of a large-current small circuit breaker in Embodiment 3 of the present application.

[0043] Figure 12 is a structural schematic view highlighting the gap between the second lead wire and the thermal element.

[0044] Figure 13 is a structural schematic view highlighting the pre-loading groove of a large-current small circuit breaker in Embodiment 4 of the present application.

[0045] BRIEF DESCRIPTION OF DRAWINGS 1, stationary contact plate; 11, limiting plate; 12, give-way slot; 13, sliding slot; 14, first clamping plate; 15, second clamping plate; 16, plug block; 2, cylinder base; 21, insulating ring; 22, limiting cylinder; 23, stationary iron core; 231, limiting ring; 24, through slot; 241, spring slot; 242, trigger slot; 25, through slot; 3, iron core assembly; 31, moving iron core; 311, top slot; 32, trigger lever; 33, return spring; 34, control ring; 35, through slot; 36, insertion slot; 37, insertion pin; 38, limiting slot; 39, limiting block; 4, spiral coil; 41, coil body; 42, coil head; 5, first wiring plate; 51, second wiring plate; 52, thermal element; 6, first gap; 61, second gap; 62, shunt lead wire; 7, housing; 71, heat dissipation slot; 72, transverse reinforcing rib; 73, longitudinal reinforcing rib; 74, pre-loading groove; 8, contact system; 81, moving contact; 82, stationary contact; 9, first lead wire; 91, second lead wire; 92, third lead wire. DETAILED DESCRIPTION

[0046] The following description will be made in conjunction with the accompanying Figures 1-13 The present application is further described in detail.

[0047] Embodiment 1 of the present application discloses an electromagnetic system of a large-current small circuit breaker. Referring to Figure 1 and Figure 2The electromagnetic system of the large-current small circuit breaker comprises a static contact plate 1, two limiting plates 11 fixedly connected on the static contact plate 1, a cylinder seat 2 clamped and connected between the two limiting plates 11, and an iron core assembly 3 slidingly arranged in the cylinder seat 2 and used for driving a trigger tripping system. A spiral coil 4 is spirally wound on the cylinder seat 2, one end of the spiral coil 4 is electrically connected to the static contact plate 1, and the other end of the spiral coil 4 is electrically connected to a first wiring plate 5. The spiral coil 4 comprises a coil main body 41 wound on the cylinder seat 2 and a coil head 42 electrically connected to the static contact plate 1 or the first wiring plate 5. A magnetic field generated by the spiral coil 4 acts on the iron core assembly 3. In the embodiment, the static contact plate 1 and the limiting plate 11 are both made of metal materials considering the electrical conductivity, material strength and manufacturing cost of the static contact plate 1 and the limiting plate 11, and the cylinder seat 2 is made of insulating plastic. The two coil heads 42 are fixedly and electrically connected to the static contact plate 1 and the first wiring plate 5 by welding respectively.

[0048] With reference to Figure 1 With reference to Figure 2 With reference to Figure 3 Since the coil main body 41 is spirally wound and has a cylindrical shape, and the static contact plate 1 has a flat plate shape, a first gap 6 is formed between the side wall of the coil main body 41 and the side wall of the static contact plate 1. Since the coil main body 41 is spirally wound on the cylinder seat 2, an included angle exists between the winding direction of the coil main body 41 and the length direction of the cylinder seat 2, so that a second gap 61 is formed between the end of the coil main body 41 and the end of the corresponding limiting plate 11.

[0049] With reference to Figure 1 With reference to Figure 2 With reference to Figure 3 A shunt wire 62 is further electrically connected between the static contact plate 1 and the first wiring plate 5. The extension direction of the shunt wire 62 is triggered from the position electrically connected to the static contact plate 1. The shunt wire 62 passes through the first gap 6 first, then passes through the second gap 61 and is wound on the cylinder seat 2 along the winding direction of the coil main body 41. In the embodiment, the shunt wire 62 is made of copper soft connection, and the two ends of the shunt wire 62 are electrically connected and fixed to the static contact plate 1 and the first wiring plate 5 by welding respectively.

[0050] With reference to Figure 1 With reference to Figure 3 An insulating ring 21 is fixedly connected to the end of the cylinder seat 2. In the embodiment, the insulating ring 21 is made of insulating plastic. The insulating ring 21 is located in the second gap 61 and between the side wall of the limiting plate 11 facing the coil main body 41 and the shunt wire 62 located in the second gap 61. The electrically conductive limiting plate 11 and the shunt wire 62 are separated by the insulating ring 21, so as to reduce the probability of electric current backflow or direct current passing through the electrically connected limiting plate 11 and the first wiring plate 5.

[0051] The implementation principle of the electromagnetic system of the large-current small circuit breaker in the embodiment 1 is as follows: when connected in a circuit with large current, normally passing through the large current, part of the current will flow through the shunt conductor 62 directly from the static contact plate 1 to the first wiring plate 5, and the current flowing through the coil body 41 is shunted. When a short circuit occurs, a large amount of current will flow through the shunt conductor 62, at this time, the magnetic field generated by the shunt conductor 62 wound on the cylinder seat 2 through the second gap 61 will superimpose with the magnetic field generated by the coil body 41, strengthening the magnetic field and accelerating the speed of the iron core assembly 3 triggering the tripping system to trip.

[0052] Embodiment 2:

[0053] Referring to Figure 4 With Figure 5 Unlike the embodiment 1, the static contact plate 1 is provided with a let-in slot 12, the length direction of the let-in slot 12 is perpendicular to the extension direction of the first gap 6, a first clamping plate 14 is rotatably connected to the inner wall of the let-in slot 12, the rotating shaft of the first clamping plate 14 is inserted into the inner wall on both sides of the length direction of the let-in slot 12, that is, the length direction of the rotating shaft of the first clamping plate 14 is parallel to the width direction of the let-in slot 12, and the rotating shaft of the first clamping plate 14 is located at the position close to the end of the static contact plate 1.

[0054] Referring to Figure 6 The inner wall on both sides of the length direction of the let-in slot 12 is provided with a sliding groove 13, the length direction of the sliding groove 13 extends along the length direction of the let-in slot 12, a second clamping plate 15 is rotatably connected to the end of the first clamping plate 14, the rotating shaft of the second clamping plate 15 is inserted and rotated in the first clamping plate 14, and the length direction of the rotating shaft of the second clamping plate 15 is parallel to the length direction of the rotating shaft of the first clamping plate 14, and the rotating shaft of the second clamping plate 15 and the rotating shaft of the first clamping plate 14 are located at both ends of the first clamping plate 14.

[0055] Referring to Figure 4 With Figure 6 The end of the second clamping plate 15 is fixedly connected with two insertion blocks 16 for sliding and rotating insertion into the sliding groove 13, the rotating shafts of the insertion blocks 16 and the second clamping plate 15 are located at both ends of the second clamping plate 15, respectively, and the two insertion blocks 16 are distributed on the two side walls of the second clamping plate 15 away from each other along the length direction of the rotating shaft of the second clamping plate 15, so that the position of the first clamping plate 14 and the second clamping plate 15 rotatably connected is arched to pass through the shunt conductor 62 and to clamp the shunt conductor 62.

[0056] Referring to Figure 7 With Figure 8, the barrel seat 2 comprises a limiting barrel 22 and a static iron core 23, the limiting barrel 22 is provided with a through groove 25 penetratingly formed on the limiting barrel 22, the through groove 25 is formed along the length direction of the barrel seat 2, the static iron core 23 is fixedly connected with a limiting ring 231, the diameter of the static iron core 23 is equal to the cross section diameter of the through groove 25, so that the static iron core 23 is inserted into the through groove 25, and the outer diameter of the limiting ring 231 is equal to the outer diameter of the limiting barrel 22, so that the limiting ring 231 abuts against the side wall of the limiting barrel 22 on the opening peripheral surface of the through groove 25. The insulating ring 21 is fixedly connected on the end side wall of the limiting barrel 22 away from the static iron core 23, the insulating ring 21 abuts against the inner wall of the limiting plate 11, and the limiting ring 231 abuts against the inner wall of the other limiting plate 11, the two limiting plates 11 abut against the insulating ring 21 and the limiting ring 231 respectively on the side walls of the two limiting plates 11 facing to each other, so that the two limiting plates 11 sandwich the barrel seat 2.

[0057] Referring to Figure 8 With Figure 9 , the iron core assembly 3 comprises a moving iron core 31 sliding in the through groove 25, the static iron core 23 is provided with a through slot 24 penetratingly formed on the static iron core 23, the through slot 24 extends along the length direction of the static iron core 23, and the trigger lever 32 slides in the through slot 24. The through slot 24 comprises a spring slot 241 and a trigger slot 242 which are communicated with each other, the spring slot 241 is located close to the moving iron core 31, the trigger slot 242 is located away from the moving iron core 31, the cross section diameter of the trigger slot 242 is equal to the cross section diameter of the trigger lever 32, and the cross section diameter of the spring slot 241 is greater than the cross section diameter of the trigger slot 242, so that the bottom wall of the spring slot 241 faces to the moving iron core 31.

[0058] Referring to Figure 8 With Figure 9 , the side wall of the moving iron core 31 facing to the static iron core 23 is provided with a top slot 311 for inserting the end of the trigger lever 32, the cross section diameter of the top slot 311 is equal to the cross section diameter of the trigger lever 32, and the moving iron core 31 is used for sliding and triggering the trigger lever 32, that is, the bottom wall of the top slot 311 abuts against the end of the trigger lever 32 to trigger the trigger lever 32 to slide. The reset spring 33 is installed in the spring slot 241, one end of the reset spring 33 abuts against and is fixedly connected on the bottom wall of the spring slot 241 facing to the moving iron core 31, the other end of the reset spring 33 abuts against and is fixedly connected on the side wall of the moving iron core 31 facing to the static iron core 23 on the opening peripheral surface of the top slot 311, the reset spring 33 stretches and contracts along the sliding direction of the moving iron core 31 in the through groove 25, and the reset spring 33 is used for triggering the moving iron core 31 to move away from the static iron core 23.

[0059] Referring to Figure 8 With Figure 9 With Figure 10The inner wall of the spring groove 241 is provided with a thread, and the control ring 34 is connected to the thread on the inner wall of the spring groove 241. The outer side wall of the control ring 34 is provided with a thread matched with the thread on the spring groove 241. The inner side wall of the control ring 34 is attached to the outer side wall of the trigger lever 32. The control ring 34 moves along the direction in which the spring groove 241 is formed by rotating in the spring groove 241. The control ring 34 is provided with a through slot 35 for the reset spring 33 to pass through. The inner wall of the through slot 35 is inclined, so that the outer side wall of the reset spring 33 is attached to the inner wall of the through slot 35.

[0060] Referring to Figure 9 With Figure 10 The control ring 34 is provided with a plurality of insertion slots 36. The insertion slots 36 are also formed on the bottom wall of the spring groove 241 facing the moving iron core 31. The insertion slots 36 on the control ring 34 and the spring groove 241 correspond to each other, that is, each insertion slot 36 on the control ring 34 has a corresponding insertion slot 36 on the inner wall of the spring groove 241. The same plug 37 is inserted into the two insertion slots 36. The end of the plug 37 inserted into the insertion slot 36 on the bottom wall of the spring groove 241 is wrapped with an anti-slip layer. The plug 37 uses the anti-slip layer to fit with the insertion slot 36 on the bottom wall of the spring groove 241.

[0061] Referring to Figure 7 With Figure 10 The limiting groove 38 is formed on the inner wall of the through groove 25. The length direction of the limiting groove 38 extends along the length direction of the through groove 25. The outer side wall of the static iron core 23 and the outer side wall of the moving iron core 31 are both fixedly connected with the limiting block 39 inserted and sliding in the limiting groove 38.

[0062] Embodiment 3 of the present application discloses a large-current miniature circuit breaker. Referring to Figure 3 With Figure 11 The large-current miniature circuit breaker comprises a shell 7 and a contact system 8. The inner wall of the shell 7 is also fixedly connected with a second wiring board 51 for electrical connection with an external wire. The first wiring board 5 and the second wiring board 51 are respectively connected with a wire for incoming current and a wire for outgoing current. The contact system 8 comprises a moving contact 81 rotating on the inner wall of the shell 7 and a static contact 82 fixedly connected to the static contact plate 1 by welding. In this embodiment, the static contact 82 is a silver contact.

[0063] Referring to Figure 3 With Figure 8The second terminal block 51 is electrically connected with a thermal element 52. In the embodiment, the thermal element 52 is a double gold sheet. The thermal element 52 is electrically connected with the second terminal block 51 through a third wire 92. One end of the third wire 92 is fixedly and electrically connected to the end of the second terminal block 51 away from the outside of the shell 7 by welding. The other end of the third wire 92 is fixedly and electrically connected to the end of the thermal element 52 away from the moving contact 81 by welding. When the moving contact 81 is in the closed state, the two ends of the moving contact 81 respectively abut against the end of the thermal element 52 away from the third wire 92 and the stationary contact 82. The thermal element 52 is used to deform to release the electrical connection with the moving contact 81 when overload occurs. At the same time, the thermal element 52 will push the trip system to control the moving contact 81 to rotate to release the abutment electrical connection with the stationary contact 82.

[0064] Referring to Figure 11 The second terminal block 51 is electrically connected with a first wire 9. One end of the first wire 9 is fixedly and electrically connected to the end of the second terminal block 51 away from the outside of the shell 7 by welding. The other end of the first wire 9 is fixedly and electrically connected to the moving contact 81 by welding. The thermal element 52 is electrically connected with a second wire 91. One end of the second wire 91 is fixedly and electrically connected to the thermal element 52 by welding. The end of the second wire 91 on the thermal element 52 is located between the end of the third wire 92 on the thermal element 52 and the position where the moving contact 81 abuts against the thermal element 52. The other end of the second wire 91 is fixedly and electrically connected to the moving contact 81 by welding. In the embodiment, the first wire 9, the second wire 91 and the third wire 92 are all copper soft connections (for example, copper wires).

[0065] Referring to Figure 11 With Figure 12 In order to consider stability and space utilization, the first wire 9 and the second wire 91 are attached to the inner wall of the shell 7, and there is a gap between the second wire 91 and the thermal element 52. The inner wall of the shell 7 at the attachment position of the first wire 9 and the second wire 91 is provided with a heat dissipation groove 71 for heat dissipation. The cross-sectional opening of the heat dissipation groove 71 is larger than the cross-sectional diameter of the first wire 9 plus the second wire 91 plus the distance between the first wire 9 and the second wire 91. The first wire 9 and the second wire 91 are located on the opening surface of the heat dissipation groove 71 and are difficult to cover the opening surface of the heat dissipation groove 71, so that the heat dissipation groove 71 can dissipate heat for the first wire 9 and the second wire 91.

[0066] Referring to Figure 11 With Figure 12The bottom wall of the heat dissipation groove 71 is fixedly connected with a transverse reinforcing rib 72 and a longitudinal reinforcing rib 73 for strengthening the structural strength of the shell 7. The heat dissipation groove 71 with a large cross section is divided into a plurality of heat dissipation grooves 71 with small cross sections by the transverse reinforcing rib 72 and the longitudinal reinforcing rib 73. The longitudinal reinforcing rib 73 is located between the length direction of the first conducting wire 9 and the length direction of the second conducting wire 91, and the length direction of the transverse reinforcing rib 72 is staggered with the length direction of the first conducting wire 9 and the second conducting wire 91, so that the first conducting wire 9 and the second conducting wire 91 are respectively in contact with a plurality of transverse reinforcing ribs 72 on both sides of the longitudinal reinforcing rib 73, the transverse reinforcing rib 72 plays a supporting role, and the first conducting wire 9 and the second conducting wire 91 are difficult to be in contact with the bottom wall of the heat dissipation groove 71, which plays a guarantee role for the first conducting wire 9 and the second conducting wire 91 suspended at the opening of the heat dissipation groove 71, and also guarantees the heat dissipation effect of the heat dissipation groove 71, so that the heat dissipation groove 71 has enough space to dissipate the heat emitted by the first conducting wire 9 and the second conducting wire 91.

[0067] The implementation principle of the large-current small circuit breaker in the embodiment 3 is as follows: when connected to a circuit with large current, normally passing through the large current, after the large current flows into the second wiring board 51, part of the current directly flows into the movable contact 81 through the first conducting wire 9 and the second conducting wire 91, and only part of the current flows into the thermal element 52 through the third conducting wire 92 to trigger the trip system by the overload heating deformation of the thermal element 52, and the first conducting wire 9 and the second conducting wire 91 act as a shunt carrier to limit the amount of current passing through the thermal element 52.

[0068] Meanwhile, the first conducting wire 9 and the second conducting wire 91 as a shunt carrier also disperse the temperature rise generated by power-on, and the heat of the part of the conducting wire attached to the inner wall of the shell 7 is dissipated to the inside of the shell 7 through the heat dissipation groove 71, achieving the effect of reducing the temperature rise.

[0069] Embodiment 4:

[0070] Referring to Figure 11 With Figure 12 With Figure 13 Different from the embodiment 3, the transverse reinforcing rib 72 is provided with a pre-assembly groove 74 for embedding the first conducting wire 9 and the second conducting wire 91, and the inner wall of the pre-assembly groove 74 is in contact with the side wall of the first conducting wire 9 and the second conducting wire 91, which plays a limiting role for the first conducting wire 9 and the second conducting wire 91.

[0071] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, so that: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An electromagnetic system for a large current miniature circuit breaker, comprising a stationary contact plate (1), at least two limit plates (11) being provided on the stationary contact plate (1), a cartridge seat (2) being clamped and connected between the limit plates (11), an iron core assembly (3) for pushing and triggering a tripping system slidingly arranged in the cartridge seat (2), a spiral coil (4) being spirally wound on the cartridge seat (2), one end of the spiral coil (4) being electrically connected to the stationary contact plate (1), and the other end of the spiral coil (4) being electrically connected to a first terminal block (5), characterized in that: The spiral coil (4) includes a coil body (41) wound on the cylinder seat (2) and a coil head (42) electrically connected to the static touch plate (1) or the first terminal block (5); a first gap (6) is formed between the side wall of the coil body (41) and the side wall of the static touch plate (1); a second gap (61) is formed between the end of the coil body (41) and the end of the corresponding limit plate (11); a shunt wire (62) is also electrically connected between the static touch plate (1) and the first terminal block (5); the shunt wire (62) passes through the first gap (6), then passes through the second gap (61) and is wound on the cylinder seat (2) along the winding direction of the coil body (41).

2. The electromagnetic system of a large current miniature circuit breaker according to claim 1, characterized in that: An insulating ring (21) is provided on the end of the cartridge seat (2), and the insulating ring (21) is located between the limiting plate (11) and the shunt wire (62). The insulating ring (21) is used to separate the limiting plate (11) and the shunt wire (62).

3. The electromagnetic system of a large current miniature circuit breaker according to claim 2, characterized in that: The static contact plate (1) is provided with a clearance groove (12), a first clamping plate (14) is rotatably provided on the inner wall of the clearance groove (12), a sliding groove (13) is provided on the inner wall of the clearance groove (12), a second clamping plate (15) is rotatably provided on the end of the first clamping plate (14), and an insert (16) for inserting into the sliding groove (13) and sliding is provided on the end of the second clamping plate (15), so that the position where the first clamping plate (14) and the second clamping plate (15) are rotatably connected is arched to allow the shunt wire (62) to pass through and to clamp the shunt wire (62).

4. The electromagnetic system for a large current miniature circuit breaker according to claim 1, characterized in that: The cylinder seat (2) includes a limiting cylinder (22) and a static iron core (23), and the limiting cylinder (22) and the static iron core (23) are mutually sleeved and clamped. The iron core assembly (3) includes a moving iron core (31) sliding in the limiting cylinder (22), and a through slot (24) is provided on the static iron core (23). A trigger rod (32) slides through the through slot (24), and the moving iron core (31) is used to slide and push the trigger rod (32). A reset spring (33) is provided in the through slot (24), and the other end of the reset spring (33) pushes on the moving iron core (31). The reset spring (33) expands and contracts along the sliding direction of the moving iron core (31) in the limiting cylinder (22). A control ring (34) is connected to the inner thread of the through slot (24), and a through slot (35) for the reset spring (33) to pass through is provided on the control ring (34).

5. The electromagnetic system of a large current miniature circuit breaker according to claim 4, characterized in that: The control ring (34) and the through slot (24) are provided with corresponding slots (36), and the same latch (37) is inserted into the corresponding slots (36). A limiting slot (38) is provided on the inner wall of the limiting cylinder (22), and both the static iron core (23) and the movable iron core (31) are provided with limiting blocks (39) for inserting and sliding in the limiting slot (38).

6. A high-current miniature circuit breaker using the electromagnetic system according to any one of claims 1 to 5, comprising a housing (7) and a contact system (8), wherein a second terminal block (51) for electrically connecting to an external wire is further provided on the inner wall of the housing (7), characterized in that: The contact system (8) includes a movable contact (81) rotating on the inner wall of the housing (7) and a static contact (82) electrically connected to the static contact plate (1); the second terminal block (51) is electrically connected to a thermal element (52); when the movable contact (81) is in a closed state, two ends of the movable contact (81) respectively abut against the other end of the thermal element (52) and the static contact (82) electrically connected; the thermal element (52) is used to deform and release the electrical connection with the movable contact (81) when overloaded; the second terminal block (51) is electrically connected to a first wire (9), the first wire (9) is also electrically connected to the movable contact (81); the thermal element (52) is electrically connected to a second wire (91), the second wire (91) is also electrically connected to the movable contact (81).

7. A large current miniature circuit breaker according to claim 6, characterized in that: The first wire (9) and the second wire (91) are both attached to the inner wall of the housing (7), and a heat dissipation groove (71) for heat dissipation is provided on the inner wall of the housing (7) where the first wire (9) and the second wire (91) are attached.

8. A large current miniature circuit breaker according to claim 7, characterized in that: The bottom wall of the heat dissipation groove (71) is provided with transverse reinforcing ribs (72) and longitudinal reinforcing ribs (73) for reinforcing the structural strength of the housing (7).

9. A large current miniature circuit breaker according to claim 8, characterized in that: The first wire (9) and the second wire (91) are attached to the transverse reinforcing ribs (72) and span the opening surface of the heat dissipation slot (71); the longitudinal reinforcing ribs (73) are located between the first wire (9) and the second wire (91) and penetrate and connect the plurality of transverse reinforcing ribs (72).

10. A large current miniature circuit breaker according to claim 8, characterized in that: A pre-installed groove (74) is provided on the transverse reinforcing rib (72), and the pre-installed groove (74) is used for the first wire (9) and the second wire (91) to be embedded therein so as to limit the position of the first wire (9) and the second wire (91).

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