Intelligent magnetic control low-voltage switch device

Abstract

The application discloses a kind of intelligent magnetic control low-voltage switch device, including magnetic control primary module and blade type secondary module;The magnetic control primary module includes first bottom shell, first top shell, plastic shell baffle, bottom plate, the first bottom shell, first top shell, plastic shell baffle, bottom plate form entire shell frame;The application can realize automatic opening and closing under the size requirement of original manual plastic shell circuit breaker, directly replace the existing old switch of station area, the opening and closing speed is greatly changed fast, improve mechanical performance, effectively increase the space capacity of secondary control module, realize high intelligence, one, secondary integral modular design, secondary module heat insulation design, secondary control module can be plugged, can realize not power replacement secondary module, improve the operation and maintenance ability of product, the service life of primary and secondary module is same period, greatly improve the service life of device, secondary vulnerable components can be plugged alone, improve the flexibility of device, with higher scientificity, logic.

Description

Technical Field

[0001] This invention relates to the field of substation control technology, and in particular to an intelligent magnetically controlled low-voltage switchgear. Background Technology

[0002] Molded case circuit breakers (MCCBs) are widely used in power distribution networks, photovoltaic systems, new energy vehicle charging stations, and electrical system assembly. As a crucial component of power distribution networks, low-voltage MCCBs currently suffer from spring-operated mechanisms. These mechanisms are characterized by numerous components, complex structures, susceptibility to wear, and short service life. Furthermore, traditional MCCBs suffer from low levels of intelligence, requiring manual operation, slow response times, and high failure rates. The existing spring-operated 3P MCCBs are all manually operated. Under high rated current conditions, such as above 400A, significant force is required to operate the MCCB, which is time-consuming and labor-intensive. To achieve electric operation of existing spring-operated MCCBs, an internal drive motor or an external electric operating mechanism is needed. However, even with an electric operating mechanism, the internal drive motor remains, increasing the overall size of the device and making direct replacement of old MCCBs impossible. Furthermore, existing spring-operated molded case circuit breakers have a slow response speed. In manual operation, the opening time is 20-40ms and the closing time is 40-70ms. In electric operation, the opening time is 20-40ms, and the fastest closing time is over 500ms. This cannot meet the needs of applications requiring rapid opening and closing, such as fire prevention, electric shock protection, photovoltaic applications, and multiple power source backups. Upgrading existing molded case circuit breakers cannot be done within the same volume. If the upgraded circuit breaker is the same size as the original, very few functional modules can be added, resulting in a low level of intelligence. The spring-operated mechanism and its drive motor occupy most of the upper space of the molded case circuit breaker, leaving very limited space for the secondary system. The primary and secondary control systems of existing molded case circuit breakers are integrated, making modularization impossible. Furthermore, it cannot achieve live plug-and-play replacement of the secondary control system, and the primary and secondary lifespans cannot be synchronized. While the primary system is still functioning normally, the secondary control system may have already aged and failed, leading to the scrapping of the entire circuit breaker and resulting in waste. Traditional molded case circuit breakers do not have complete isolation between the control circuit board and the primary circuit, resulting in poor thermal insulation. The primary circuit operates at high temperatures, which transfers heat to the secondary circuit, accelerating its aging. Spring-type operating mechanisms are complex, prone to wear, and have a relatively short mechanical lifespan of only 20,000 to 50,000 cycles, making them unsuitable for meeting the growing demands for intelligence and high performance in low-voltage intelligent circuit breakers. Summary of the Invention

[0003] In view of the problems in the prior art, the purpose of the present invention is to provide an intelligent magnetically controlled low-voltage switch device that achieves fully automatic operation, has a high level of intelligence, long service life, high reliability, and high performance.

[0004] This invention is achieved by the following technical solution:

[0005] A smart magnetically controlled low-voltage switch, the smart magnetically controlled low-voltage switch comprising a magnetically controlled primary module and a blade-type secondary module;

[0006] The magnetically controlled primary module includes a first bottom shell, a first top shell, a plastic shell baffle, and a bottom plate, which together form the entire shell frame.

[0007] Furthermore, the lower part of the magnetically controlled primary module includes a power supply side terminal, an arc-extinguishing grid, a moving knife assembly, a magnetic control mechanism, a stationary knife, a copper busbar, a protective current transformer, a measuring current transformer, a square sheet, a load side terminal, a thin paper sheet, and a long thin sheet.

[0008] The moving tool assembly includes: a moving tool, an isolation tool sleeve, an overtravel spring, an overtravel spring base, a first pin, a moving tool base, a centering spring base, a centering spring, a second pin, a small bearing, and a third pin.

[0009] The magnetic control mechanism includes: an insulating rotating shell, a rotating table, a first baffle, a magnetic control shell, a guide post, a guide block, a support base, a transmission shaft, a small torsion spring, a fixed rod, an upper magnetic ring, a coil, a lower magnetic ring, an upper sealing ring, a lower sealing ring, a base plate, a guide sleeve, and a guide rod.

[0010] The first bottom shell is used to install primary circuit components and magnetic control mechanism. The first bottom shell includes a through hole for installing stationary knife, a rectangular block for supporting stationary knife, an isolation baffle, and a through hole for installing moving knife base.

[0011] Furthermore, the stationary blade structure includes a threaded hole for connecting to the first bottom shell, a cylindrical threaded hole for connecting to the power supply side terminal, and a stationary blade contact.

[0012] Furthermore, the moving blade assembly is installed in the middle of the first bottom shell, and the moving blade base in the moving blade assembly is installed on the first bottom shell. Two bolts pass through the first bottom shell and the moving blade base from the bottom of the first bottom shell upwards and are fastened to the threaded holes of the moving blade base. Another two bolts pass through the first bottom shell, the moving blade base, and the copper busbar from the bottom of the first bottom shell upwards and are fastened to the threaded holes of the copper busbar, thereby fixing the moving blade assembly and the copper busbar.

[0013] Furthermore, an isolation baffle structure is designed in the first bottom shell. The moving blade of the moving blade assembly passes through the isolation baffle during the swinging process. The isolation baffle is used for arc isolation. A limit plate structure is designed in the middle of the first bottom shell to limit the isolation blade sleeve to a certain extent.

[0014] Furthermore, the first bottom shell is designed with four large through holes for fixing the entire magnetically controlled low-voltage switch to the branch box or other equipment by bolts. Multiple rectangular protrusions are also provided on the upper surface of the first bottom shell, and multiple annular protrusions are also provided at the nut mounting hole position connecting the first top shell, which are used to limit the movement when the first bottom shell and the first top shell are combined.

[0015] A single row of long grooves is provided on one side of the first bottom shell for mounting additional electronic components, while multiple rows of long grooves are designed on the other side of the first bottom shell for mounting N-pole components in a 3P+N configuration. Multiple locking grooves are designed at both ends of the first bottom shell for connecting other modules, such as zero-sequence current transformer modules.

[0016] A wiring groove is designed at the bottom of the first base shell. The magnetically controlled low-voltage switch adopts dual-side voltage draw. Among the six bolts connecting the stationary knife on the power supply side, one bolt is taken from each phase for voltage sampling, and the other bolt in each phase is used to install a thermistor for temperature measurement.

[0017] Furthermore, the first top shell also includes: nut holes for installing the front connecting plate, nut holes for installing the rear connecting plate, nut holes for installing the second bottom shell, nut holes for installing the third baffle, a stepped groove for installing the opening and closing indicator rod, a wiring groove, a groove for installing the auxiliary contact switch, a rectangular hollow groove, an N pole channel, nut holes for pressing the N pole wire, and nut holes for fixing the N pole small copper busbar.

[0018] The first top shell also includes: terminal holes, grooves for limiting the first bottom shell, locking grooves, bolt holes for fixing the magnetically controlled low-voltage switch, raised outer shell, circular leakage holes, contact leakage holes, and locking grooves.

[0019] Furthermore, the magnetically controlled primary module also includes auxiliary contacts and a very small copper busbar.

[0020] Furthermore, the auxiliary contact switch is installed in the groove of the first top shell for mounting the auxiliary contact switch. The auxiliary contact inside extends out from the contact hole of the first top shell. When the low-voltage switch is tripped, the isolating sleeve touches the auxiliary contact and drives the auxiliary contact to move, triggering a position signal.

[0021] Furthermore, the bottom of the plastic shell baffle is designed with multiple sets of reinforcing ribs to improve the strength of the baffle;

[0022] The baffle has a large rectangular hole in the middle, which allows the plastic baffle to be fitted onto the first top shell, leaving only two long rectangular holes for European-style terminal plugging exposed. The space is relatively enclosed to protect the front-end connecting plate, the rear-end connecting plate and the circuits connected to them.

[0023] The plastic shell baffle is designed with a circular hole for the upper and lower rods of the opening and closing indicator to pass through.

[0024] The technical solution of the present invention can achieve the following beneficial technical effects:

[0025] This invention provides an intelligent magnetically controlled low-voltage switchgear that can automatically open and close circuits within the size requirements of existing manual molded case circuit breakers, directly replacing old switches in distribution areas. It significantly increases the opening and closing speed, improves mechanical performance, effectively increases the space capacity of the secondary control module, and achieves a high degree of intelligence. The primary and secondary modules are designed as a single modular unit with thermal insulation for the secondary module. The secondary control module is pluggable, allowing for uninterrupted power replacement, thus improving product maintenance capabilities. The primary and secondary modules have the same service life, greatly extending the device's lifespan. Easily damaged secondary components can be individually plugged in and out, increasing the device's flexibility. The invention demonstrates a high degree of scientific rigor and logical consistency.

[0026] The intelligent magnetically controlled low-voltage switch of this invention consists of a magnetically controlled primary module and a blade-type secondary module. The modular design of the primary and secondary units improves flexibility and ease of operation. This magnetically controlled low-voltage switch enables electric opening and closing within the traditional molded case circuit breaker's size, eliminating the need for manual operation, simplifying operation, reducing worker workload, and enabling remote control, remote signaling, and remote measurement. It can directly replace existing traditional molded case circuit breakers in the distribution area without requiring additional wiring or expansion of branch boxes or cabinets, directly improving the performance of traditional low-voltage switches and making them more convenient to use.

[0027] The magnetic control mechanism of this invention features a simple structure, high reliability, high durability, and long service life, with a mechanical lifespan of up to 100,000 cycles. The magnetically controlled low-voltage switch achieves a 4ms opening time and an 11ms closing time, significantly improving breaking capacity by at least 50% compared to traditional methods. Furthermore, the faster the opening speed, the better the arc-extinguishing performance, leading to a substantial improvement in overall performance. The magnetic control mechanism allows for adjustable overtravel distance, which is impossible with traditional spring-operated structures, making prototype debugging more convenient and flexible. The high performance of the magnetically controlled low-voltage switch enables its application in various scenarios, including but not limited to low-voltage power distribution automation, orderly photovoltaic power generation in distribution areas, mutual backup for multiple power sources, fire prevention in electrical systems, and protection against electric shock. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the intelligent magnetically controlled low-voltage switch of the present invention;

[0029] 1-Magnetically controlled primary module, 2-Blade type secondary module

[0030] Figure 2 This is a schematic diagram of the appearance of a magnetically controlled primary module;

[0031] 101 - First bottom shell, 102 - First top shell, 103 - Plastic shell baffle

[0032] Figure 3 This is a schematic diagram of the appearance of a magnetically controlled primary module;

[0033] 104-Bottom Panel

[0034] Figure 4 A schematic diagram of the bolt mounting holes for the first top shell section;

[0035] Figure 5 A schematic diagram of the nut mounting holes for the first bottom shell section;

[0036] 102-1 to 102-10 connect to the first bottom shell bolt mounting holes, and 101-1 to 101-10 connect to the first top shell nut mounting holes.

[0037] Figure 6 Schematic diagram of bolt mounting holes for the plastic shell baffle;

[0038] Figure 7 Schematic diagram of the nut mounting holes in the first top shell section;

[0039] 103-1 to 102-4 connect to the first top shell bolt mounting holes; 102-11 to 102-14 connect to the plastic shell baffle nut mounting holes.

[0040] Figure 8 This is a schematic diagram of the lower structure of the magnetically controlled primary module of the present invention;

[0041] Figure 9 This is a schematic diagram of the moving blade assembly structure of the present invention;

[0042] 117-Moving tool; 118-Isolation tool holder; 119-Overtravel spring; 120-Overtravel spring base; 121-First pin; 122-Moving tool base; 123-Center spring base; 124-Center spring; 125-Second pin; 126-Small bearing; 127-Third pin;

[0043] Figure 10 This is a schematic diagram of the internal structure of the intermediate cavity of the moving blade assembly of the present invention;

[0044] Figure 11 This is a schematic diagram of the first bottom shell portion of the present invention;

[0045] Figure 12 This is a schematic diagram of the lower front end structure of the magnetically controlled primary module of the present invention;

[0046] Figure 13 This is a schematic diagram of the static blade structure of the present invention;

[0047] Figure 14 This is a schematic diagram of the lower partial structure of the magnetically controlled primary module of the present invention;

[0048] 101-35~101-38 - Bolt holes for mounting the support base; 101-39~101-40 - Limiting plate structure

[0049] Figure 15 This is a schematic diagram of the moving blade base structure of the present invention;

[0050] 122-1~122-2 - Threaded holes connecting the first bottom shell; 122-3~122-4 - Straight holes connecting the first bottom shell and the copper busbar.

[0051] Figure 16 This is a schematic diagram of the copper busbar structure of the present invention;

[0052] Figure 17 This is a schematic diagram of the isolation blade sleeve structure of the present invention;

[0053] 118-1 - Cylindrical hole for securing the overtravel spring; 118-2 - Groove for securing the second pin and the central spring base; 118-3 - Through hole for connecting the third pin; 118-4 - Cylindrical hole connecting the various chambers; 118-5 - Tail fin

[0054] Figure 18 This is a schematic diagram of the support base structure of the present invention;

[0055] 135-1 - Threaded hole connecting to the first bottom shell; 135-2 - Circular drain hole; 135-3 - Through hole connecting to the second baffle; 135-4 - Limiting groove.

[0056] Figure 19 This is a schematic diagram of the assembly of the magnetic control mechanism and the moving blade assembly of the present invention;

[0057] Figure 20 This is a partially enlarged schematic diagram of the assembly of the magnetic control mechanism and the moving blade assembly of the present invention;

[0058] Figure 21 A bottom view of the assembly of the second baffle portion of the present invention;

[0059] Figure 22 This is a schematic diagram of the assembly of the base plate of the present invention;

[0060] Figure 23 This is a schematic diagram of the magnetically controlled housing of the present invention;

[0061] Figure 24 This is a schematic diagram of the bottom of the rotary table of the present invention;

[0062] Figure 25 This is a schematic diagram of the top of the rotary table of the present invention;

[0063] Figure 26 This is a schematic diagram of the insulating spiral shell of the present invention;

[0064] Figure 27Schematic diagram of the lower tail structure of the magnetically controlled primary module;

[0065] Figure 28 Schematic diagram of the holes at the tail section of the first bottom shell;

[0066] 149 - Round nut; 101-14 to 101-46 - Bolt holes for connecting copper busbars; 101-47 to 101-49 - Grooves for installing round nuts.

[0067] Figure 29 This is a schematic diagram of the first bottom shell portion of the present invention;

[0068] 101-50~101-53 Bolt holes for fixing magnetically controlled low-voltage switches; 101-54~101-57 Rectangular protrusions; 101-58 Single row of long grooves; 101-59 Multi-row of long grooves; 101-60~101-67 Locking grooves;

[0069] Figure 30 This is a schematic diagram of the first bottom shell portion of the present invention;

[0070] 101-68 - Wiring groove; 101-69 - Hollow groove; 150 - Thermistor;

[0071] Figure 31 This is a schematic diagram of the upper structure of the magnetically controlled primary module of the present invention;

[0072] 151-Front-end connection plate; 152-Rear-end connection plate; 153-64-Position female European-style terminal; 154-Position 32-Position female European-style terminal; 155-Auxiliary contact switch; 156-Opening / closing indicator upper lever; 157-Opening / closing indicator lower lever; 158-Third baffle;

[0073] Figure 32 This is a top view of the first top shell structure of the present invention;

[0074] 102-15~102-18 - Nut holes for installing the front-end connecting plate; 102-19~102-21 - Nut holes for installing the rear-end connecting plate; 102-22~102-25 - Nut holes for installing the second bottom shell; 102-26~102-27 - Nut holes for installing the third baffle; 102-28 - Stepped groove for installing the lower lever of the opening / closing indicator; 102-29~102-30 - Wiring groove; 102-31~102-32 - Groove for installing the auxiliary contact switch; 102-33~102-35 - Rectangular hollow groove; 102-36 - N pole channel; 102-37~102-38 - Nut holes for clamping the N pole wire; 102-39 - Nut holes for fixing the N pole small copper busbar.

[0075] Figure 33 This is a schematic diagram of the first top shell structure from below, according to the present invention.

[0076] 102-40~102-45~Terminal holes, 102-46~102-49~Groove for limiting the first bottom shell, 102-50~102-57~Locking groove, 102-58~102-61~Screw holes for fixing the magnetically controlled low-voltage switch, 102-62~Protruding outer shell, 102-63~Circular perforation, 102-64~Contact perforation, 102-65~Locking groove

[0077] Figure 34 This is a partial structural diagram of the magnetically controlled primary module of the present invention;

[0078] 159 - Auxiliary contact, 160 - N Miniature copper busbar

[0079] Figure 35 This is a schematic diagram of the opening and closing indicator assembly of the present invention;

[0080] Figure 36 This is a schematic diagram of the N-pole small copper busbar of the present invention;

[0081] 161-Indicator Spring

[0082] Figure 37 This is a schematic diagram of the plastic shell baffle structure of the present invention; Detailed Implementation

[0083] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0084] In a specific embodiment, the present invention provides an intelligent magnetically controlled low-voltage switch device, such as... Figure 1 As shown, the intelligent magnetically controlled low-voltage switch includes a magnetically controlled primary module and a blade-type secondary module.

[0085] Specifically, such as Figure 2 and Figure 3 As shown, the magnetically controlled primary module includes a first bottom shell 101, a first top shell 102, a plastic shell baffle 103, and a bottom plate 104. The first bottom shell, the first top shell, the plastic shell baffle, and the bottom plate form the entire shell frame. The first bottom shell and the first top shell are connected by eight bolts and nuts. The first top shell has 10 bolt mounting holes, and the first bottom shell has 10 nut mounting holes.

[0086] Ten nut mounting holes on the first bottom shell allow for the placement of round nuts. Bolts, starting from the top of the first top shell, penetrate both the first top and bottom shells and connect to the round nuts, thus securing the first bottom and top shells together. The bottom shell is connected to a bottom panel with adhesive on its inner surface for attachment to the first bottom shell. A plastic shell baffle is mounted on the first top shell. The top shell has four square protrusions at its four corners, each with nut holes for insert nuts. Four bolt mounting holes are located at the four corners of the plastic shell baffle, allowing bolts to pass through and be secured to the four insert nuts on the first top shell, thus fixing the plastic shell baffle in place.

[0087] The lower part of the magnetically controlled primary module includes a power supply side terminal 106, an arc extinguishing grid 106, a moving knife assembly 107, a magnetic control mechanism 108, a stationary knife 109, a copper busbar 110, a protective current transformer 111, a measuring current transformer 112, a square thin sheet 113, a load side terminal 114, a thin paper sheet 115, and a long thin sheet 116.

[0088] The moving tool assembly includes: a moving tool, an isolation tool sleeve, an overtravel spring, an overtravel spring base, a first pin, a moving tool base, a centering spring base, a centering spring, a second pin, a small bearing, and a third pin.

[0089] The magnetic control mechanism includes: an insulating rotating shell, a rotating table, a first baffle, a magnetic control shell, a guide post, a guide block, a support base, a transmission shaft, a small torsion spring, a fixed rod, an upper magnetic ring, a coil, a lower magnetic ring, an upper sealing ring, a lower sealing ring, a base plate, a guide sleeve, and a guide rod.

[0090] Specifically, such as Figure 11 As shown, the first bottom shell includes a through hole for mounting the stationary knife, a rectangular block for supporting the stationary knife, an isolation baffle, and a through hole for mounting the moving knife base.

[0091] The first base shell is used to install primary circuit components and magnetic control mechanisms. The side of the first base shell with a semi-elliptical groove is the power supply side. The stationary blade is bolted to the first base shell. The first base shell has a rectangular protrusion, and the stationary blade has a corresponding groove to limit its movement. The bolts are installed from the bottom of the first base shell upwards, passing through the first base shell and the stationary blade in sequence. The stationary blade has threaded holes for tightening the bolts. The front end of the stationary blade has a cylindrical threaded hole for connecting the power supply side terminals. The external cable is placed in the cylindrical threaded hole, and then the power supply side terminals are tightened to connect the circuit. The bottom of the stationary blade has a stationary blade contact. The moving blade contact moves away from or into the stationary blade contact during opening and closing, thus disconnecting or connecting the entire current loop.

[0092] like Figure 13The diagram shows a static knife structure, which includes a threaded hole 109 for connecting to the first bottom shell, a cylindrical threaded hole 109-2 for connecting to the power supply side terminal, and a static knife contact 103-3.

[0093] A thin paper sheet and a long thin sheet are installed on the upper front side of the stationary contact. The long thin sheet is made of insulating material and has many small holes to facilitate the escape of gas during the magnetic blowout arc extinguishing process. The thin paper sheet is flexible; when gas is blown out in the magnetically controlled low-voltage switch, the thin paper sheet is bent, and then returns to its original state, providing a certain degree of blocking and protecting the internal components. An arc-extinguishing grid is installed on the upper part of the stationary knife. The arc-extinguishing grid is used for arc extinguishing, and the faster the opening speed, the better the arc-extinguishing effect of the grid.

[0094] The moving blade assembly is installed in the middle of the first bottom shell. The moving blade base in the moving blade assembly is installed on the first bottom shell. Two bolts pass through the first bottom shell and the moving blade base from the bottom of the first bottom shell upwards and are fastened to the threaded holes of the moving blade base. Two other bolts pass through the first bottom shell, the moving blade base, and the copper busbar from the bottom of the first bottom shell upwards and are fastened to the threaded holes of the copper busbar, thereby fixing the moving blade assembly and the copper busbar.

[0095] The first bottom shell is designed with an isolation baffle structure. The moving blade of the moving blade assembly passes through the isolation baffle during its swing, and the isolation baffle serves as an arc-blocking device. A limit plate structure is designed in the middle of the first bottom shell to limit the rotation of the isolation blade sleeve and ensure the rotational accuracy of the isolation blade sleeve during opening and closing.

[0096] like Figure 15 The moving tool base structure includes a threaded hole for connecting the first bottom shell and a straight hole for connecting the first bottom shell and the copper busbar;

[0097] like Figure 17 As shown, the isolation blade sleeve structure includes a cylindrical hole 118-1 for locking the overtravel spring, a groove 118-2 for locking the second pin and the central spring base, a through hole 118-3 for connecting the third pin, a cylinder 118-4 for connecting each chamber, and a tail fin 118-5.

[0098] like Figure 15 , Figure 16 , Figure 17As shown, the moving knife assembly contains three chambers within the isolating knife sleeve. Each chamber houses one moving knife, two overtravel springs, one overtravel spring base, one first pin, one moving knife base, two centering spring bases, two centering springs, and one second pin. The moving knife is equipped with the first and second pins. The first pin passes sequentially through the overtravel spring base and the moving knife. An overtravel spring is mounted on the overtravel spring base, with the other end of the overtravel spring locked in a cylindrical hole within the inner chamber of the isolating knife sleeve. The second pin passes sequentially through the centering spring base, the centering spring, the moving knife, the centering spring, and the centering spring base. Both the second pin and the centering spring base are locked in grooves within the isolating knife sleeve chambers. The isolating knife sleeve is designed with a cylindrical structure connecting the three chambers. The cylinder diameter is not less than 16mm, and the transition between the cylinder and the chambers is smooth with rounded corners, effectively reducing stress concentration in this area and preventing the isolating knife sleeve from breaking due to excessively rapid action during opening and closing. The isolating sleeve has an additional tail fin structure in its middle chamber, with a through hole designed to connect to a third pin. The third pin traverses the isolating sleeve and extends out at both ends. Small bearings are installed at both ends of the third pin to reduce friction generated during the opening and closing movement of the isolating sleeve.

[0099] In the moving blade assembly, the moving blade base is fixed to the first base shell. When the isolation blade sleeve swings, it swings around the second pin, thereby driving the moving blade to swing. Furthermore, the three second pins and the cylinders connecting the various chambers in the isolation sleeve are on the same axis, and the three moving blades swing simultaneously.

[0100] Four through holes are designed on the upper part of the first bottom shell for connecting the support base. The bolts pass through the bottom of the first bottom shell, upward through the first bottom shell and the support base, and are tightened into the threaded holes of the support base. Both sides of the support base are designed with limiting grooves, which form a complete circular hole with the limiting plate structure of the first bottom shell to achieve limiting protection for the isolation blade sleeve.

[0101] like Figure 18 As shown, the support base structure includes a threaded hole for connecting the first bottom shell, a circular drain hole, a through hole for connecting the second baffle, and a limiting groove.

[0102] like Figures 19-26As shown, a second baffle is installed on the upper part of the support base. The second baffle has through holes at its four corners. Bolts pass through the second shift lever and the support base from the upper part of the second baffle downwards and are secured with nuts. Four circular perforations are designed on the upper surface of the support base to allow the bolt assembly mounted on the second baffle to pass through without interference. A large irregularly shaped hole in the middle of the second baffle allows the transmission screw and the bolt assembly mounted on the base plate to pass through without interference. A circular threaded hole is also designed in front of the irregularly shaped hole for installing a guide sleeve. The second baffle and the first baffle are directly connected by four guide posts, forming the frame structure for the magnetic coil movement. The bolt assembly used to fasten the second baffle, the first baffle, and the guide posts, from the baffle outwards, consists of an O-ring, a flat washer, a spring washer, and a bolt. Tightening the bolts effectively seals the through holes in the first and second baffles. The four guide posts are surrounded by a magnetic control shell. The magnetic control shell is used to limit the movement of the guide posts and to form a closed space to protect the magnetic coil. The magnetic control shell is insulated.

[0103] The upper magnetic ring is bolted to the first baffle, and the bolt assembly has an O-ring seal. The coil passes through the upper magnetic ring and is also bolted to the first baffle, with an O-ring seal in the bolt assembly. The lower magnetic ring is located below the upper magnetic ring and surrounds the coil together with the upper magnetic ring. The trip spring is installed inside between the upper and lower magnetic rings and is always in a compressed state.

[0104] The magnetic coil is made of a non-rare-earth iron-based alloy. When the coil is energized in the forward direction, it generates magnetic force; when energized in the reverse direction, it demagnetizes, allowing for controllability of the magnetic mechanism. When the coil is energized in the forward direction, the two magnetic coils attract each other. Since the upper magnetic coil is fixed to the first baffle, the lower magnetic coil moves upward, causing the two magnetic coils to close tightly, compressing the opening spring. When the coil is energized in the reverse direction, the magnetic coils lose magnetism. Under the elastic force of the opening spring, the lower magnetic coil moves downward, and the two magnetic coils separate.

[0105] A drive shaft is installed inside the lower magnetic ring, located within the opening spring, and its diameter is smaller than the inner diameter of the opening spring. A flat-head bolt passes through the bottom of the lower magnetic ring upwards and is fixedly connected to the drive shaft, with the top of the flat-head bolt and the bottom of the lower magnetic ring on the same plane. The drive shaft extends upwards through the first baffle, and an O-ring seal is embedded in the hole through which the drive shaft passes in the first baffle. A fixing rod is welded to the first baffle, and the top of the fixing rod has an internal threaded hole. A rotating platform is placed on top of the fixing rod, and a flat-head bolt passes through the rotating platform and is fixedly connected to the fixing rod. The rotating platform can rotate relative to the flat-head bolt and the fixing rod.

[0106] The lower surface of the rotary table features a crescent-shaped protrusion with a straight hole for mounting a small torsion spring. The upper surface of the rotary table has a cylindrical protrusion with a hexagonal hole inside, allowing a hex wrench to be inserted and rotated. The side surfaces of the rotary table have a textured surface that complements the textured surface of the insulating shell. The insulating shell is bonded and fixed to the upper part of the rotary table, and its outer surface also has a textured surface to increase friction when the insulating shell is in contact with the surface. The rotary table is made of metal, and the insulating shell is used to protect workers from cuts during operation.

[0107] The small torsion spring is installed on the fixed rod, with one end inserted into and fixed to the first baffle, and the hole is sealed with 704 glue. The other end is inserted into and fixed to the hole on the rotating table. When the rotating table is subjected to torque to rotate, the torsion spring generates torque. When no force is applied to the rotating table, the torsion spring drives the rotating table to return to the initial position.

[0108] When the circuit is closed, the lower magnetic ring moves upward, causing the drive shaft to extend upward and reach near the bottom of the rotary table. At this point, the highest point of the drive shaft is higher than the crescent-shaped protrusion at the bottom of the rotary table. If you want to manually open the circuit at this time, you need to rotate the rotary table. One method is to use an Allen wrench to directly apply force to the rotary table. Another method is to rotate the insulating shell to drive the rotary table to rotate. After the rotary table rotates, the protrusion at the bottom of the rotary table contacts the drive shaft. As the degree of rotation increases, the height of the protrusion in contact with the drive shaft increases. The top of the drive shaft has an arc-shaped structure, which can effectively reduce the lateral friction generated when the rotary table and the drive shaft are squeezed, thus improving the manual opening performance. After the drive shaft is squeezed downward, it squeezes the lower magnetic ring in turn, creating a small gap between the closed lower magnetic ring and the upper magnetic ring. When the two magnetic rings create a gap, they will quickly demagnetize. The lower magnetic ring moves downward under the action of the opening spring, thus achieving manual opening.

[0109] A base plate is installed at the bottom of the lower magnetic ring, which is fixed by three sets of bolt assemblies containing O-rings. The bolts pass through the base plate from the bottom and are fixed in the threaded holes of the lower magnetic ring. An upper sealing ring is installed between the upper magnetic ring and the upper baffle, and a lower sealing ring is installed between the lower magnetic ring and the base plate. Through the interaction of the upper sealing ring, lower sealing ring, first baffle, second baffle, base plate, O-ring, and magnetic control housing, a complete seal is achieved for the internal space of the magnetic control mechanism. This effectively ensures that the lower magnetic ring, upper magnetic ring, and iron core are sealed, preventing water and condensation, preventing magnetic ring contamination, and improving the service life of the magnetic control mechanism.

[0110] A guide rod and a transmission screw are fixedly mounted on the base plate. The guide rod passes through the guide sleeve and serves as a guide to prevent the lower magnetic ring from rotating during its up-and-down movement, ensuring transmission accuracy. The transmission screw is connected to the guide block, which passes through the transmission screw. Spring washers and nuts are fastened to both sides. The relative position of the guide block and the transmission screw can be adjusted, thereby adjusting the overtravel distance of the moving contact, providing greater flexibility. The small bearing in the moving tool assembly is located in the slots on both sides of the guide block. The bearing can move within the holes. The outer side of the guide block is a support base, which limits the lateral movement of the small bearing and the third pin, preventing the third pin and the small bearing from falling out of the moving tool assembly.

[0111] During electric closing, the coil is energized in the forward direction, causing the upper and lower magnetic coils to generate magnetic force. The lower magnetic coil moves upward and attracts the upper magnetic coil tightly, sequentially driving the base plate, drive screw, and guide block upward. This, in turn, causes the isolating sleeve and moving blade to swing downward around the second pin shaft, thus bringing the moving blade contact into contact with the stationary blade contact. When the moving blade contact contacts the stationary blade contact, the lower magnetic coil has not yet engaged with the upper magnetic coil. The lower magnetic coil continues to move upward, while the isolating sleeve continues to swing downward. However, the moving blade has already contacted the stationary blade and cannot continue to swing downward. At this point, the stationary blade is relatively stationary and no longer moves in tandem with the isolating sleeve, thus compressing the overtravel spring and generating an overtravel force, which presses the moving blade contact tightly against the stationary blade contact. By changing the position height of the guide block relative to the drive screw, the overtravel force and overtravel distance generated by the overtravel spring can be adjusted, offering high flexibility that traditional molded case circuit breakers cannot achieve. When the electric circuit breaker is opened, the coil is energized in reverse, which causes the magnetic force between the upper and lower magnetic coils to disappear. Under the action of the opening spring, the lower magnetic coil moves downward, which in turn drives the base plate, transmission screw, and guide block to move downward in sequence. This, in turn, drives the isolating knife sleeve and the moving knife to swing downward around the second pin shaft, thereby moving the moving knife away from the stationary knife.

[0112] The copper busbar is installed at the rear of the moving blade assembly. There are four small internal threaded holes at the front and rear of the busbar. Bolts are passed from the bottom of the first base shell upwards and secured in these four threaded holes. A large oval hole at the tail end of the busbar is used to install the load-side terminal. A protective current transformer and a measuring current transformer are fitted inside the busbar for current sampling. A square thin plate is also installed at the tail end of the busbar to prevent the current transformer wires from being exposed and to protect the internal components from contact.

[0113] The first bottom shell has four large through holes for bolting the entire magnetically controlled low-voltage switch to the branch box or other equipment. Multiple rectangular protrusions are also present on the upper surface of the first bottom shell, and multiple annular protrusions are also present at the nut mounting holes connecting to the first top shell, serving as limiting elements when the first bottom and first top shells are joined. A single row of long grooves is provided on one side of the first bottom shell for mounting additional electronic components, while multiple rows of long grooves are designed on the other side for mounting N-pole components in a 3P+N configuration. Multiple locking grooves are designed at both ends of the first bottom shell for connecting other modules, such as zero-sequence current transformer modules.

[0114] A wiring groove is designed at the bottom of the first base shell. The magnetically controlled low-voltage switch uses dual-side voltage draw. Of the six bolts connecting the stationary blade on the power supply side, one bolt for each phase is used for voltage sampling, and the other bolt in each phase is used to install a thermistor for temperature measurement. Of the six bolts connecting the copper busbar on the load side, one bolt for each phase is used for voltage sampling. The power required by the secondary control module is obtained from the power supply side. The wiring runs through the wiring groove and then through the hollow slots on both sides of the bottom of the first base shell, passing upwards through the first base shell and the first top shell, and continuing on the upper surface of the first top shell to reach the front connecting plate.

[0115] The upper part of the magnetically controlled primary module includes: a front-end connection plate, a rear-end connection plate, a 64-position female European terminal, a 32-position female European terminal, an auxiliary contact switch, an upper rod for opening and closing indicators, a lower rod for opening and closing indicators, and a third baffle.

[0116] The first top shell also includes: nut holes for installing the front connecting plate, nut holes for installing the rear connecting plate, nut holes for installing the second bottom shell, nut holes for installing the third baffle, a stepped groove for installing the opening and closing indicator rod, a wiring groove, a groove for installing the auxiliary contact switch, a rectangular hollow groove, an N pole channel, nut holes for pressing the N pole wire, and nut holes for fixing the N pole small copper busbar.

[0117] The first top shell also includes: terminal holes, grooves for limiting the first bottom shell, locking grooves, bolt holes for fixing the magnetically controlled low-voltage switch, raised outer shell, circular leakage holes, contact leakage holes, and locking grooves.

[0118] The magnetically controlled primary module also includes auxiliary contacts and a very small copper busbar.

[0119] The auxiliary contact switch is installed in a recess in the first top housing for mounting the auxiliary contact switch. The auxiliary contact inside extends from the contact hole in the first top housing. When the low-voltage switch is opened, the isolating sleeve contacts the auxiliary contact, causing it to move and triggering a position signal. The lower indicator rod for opening and closing is installed in a stepped rectangular recess in the first top housing. The lower end of the upper indicator rod for opening and closing has an external thread, and the upper end has an internal thread hole, allowing the upper indicator rod to be screwed into the lower indicator rod. An indicator spring is fitted onto the lower indicator rod, and the indicator spring is pressed down by a third baffle. The third baffle is bolted to the first top housing. The first top housing has a nut hole for mounting the third baffle, allowing for the insertion of an insert nut. When the low-voltage switch is opened, the isolating sleeve swings upward, pressing the upper and lower indicator rods upward and compressing the indicator spring. At this time, the blade-type secondary module protrudes from the upper indicator rod, indicating opening. When the low-voltage switch is closed, the pressure of the isolating sleeve is removed, and the compressed indicator spring rebounds, causing the upper and lower levers of the opening and closing indicator to move downwards. At this time, the upper lever of the opening and closing indicator is lower than the blade-type secondary module, indicating that the switch is closed.

[0120] The first top shell has circular holes for mounting power-side and load-side terminals. The terminals extend through these holes into the first bottom shell and are tightened. A groove at the bottom of the first top shell serves to hold the first bottom shell in place, preventing slippage when the two shells are joined. Bolt holes for securing a magnetically controlled low-voltage switch are located on the first top shell; bolts pass through these holes into the bolt holes in the first bottom shell. Locking grooves are also provided at both ends and on the sides of the first top shell, working in conjunction with those on the first bottom shell. Three rectangular hollow slots are designed at the rear end of the first top shell, through which the wires of the lower primary components pass to the connecting plate. Two wiring channels are designed on both sides of the upper surface of the first top shell for routing the primary component wires to the front-end connecting plate, achieving wire harness organization and making the overall wiring neater, easier to manage and maintain. A thin, raised outer shell is designed in the middle of the first top shell to protect the magnetic control mechanism. A circular opening is also designed on the top of the raised outer shell to allow the rotary table in the magnetic control mechanism to extend out for easy manual tripping. In addition, the outer wall of the raised outer shell can also serve as a guide when installing and removing the blade-type secondary module.

[0121] The front end of the first top shell has four nut holes for mounting the front-end connecting plate, with built-in insert nuts for bolt fixation. The rear end of the first top shell has three nut holes for mounting the rear-end connecting plate, with built-in insert nuts for bolt fixation. Power supply, voltage sampling, and current sampling wires are routed and ultimately mounted on the front-end connecting plate via terminals. Position sampling terminals for auxiliary contact switches, temperature sampling terminals for thermistors, and control signal transmission terminals for the magnetic control mechanism are routed and mounted on the rear-end connecting plate. The front-end connecting plate has 64 female European-style terminals, and the rear-end connecting plate has 32 female European-style terminals. These female European-style terminals can connect to the male European-style terminals in the blade-type secondary module for data transmission and signal control. The upper ends of the first top shell have four nut holes for mounting the second bottom shell of the blade-type secondary module, with built-in insert nuts for bolt fixation.

[0122] A N-pole channel is designed at the tail end of the first top shell for installing the N-pole mini copper busbar. Three nut holes are designed on the N-pole channel, with embedded nuts inside. The two end nut holes are used to clamp the N-pole wire, and the middle nut hole is used to fix the N-pole mini copper busbar. Two small through holes are located at the upper ends of the N-pole copper busbar for bolting the N-pole wire. The N-pole wire is mounted from one end to the front connecting plate, and the other end is mounted to one end of the N-pole mini copper busbar and secured with bolts. An N-pole wire extends from the other end of the N-pole mini copper busbar to connect to the outer N-pole copper busbar and is secured with bolts.

[0123] The plastic-cased baffle is made of flame-retardant composite material with a metallic paint finish, effectively shielding against high-voltage / high-current interference and isolating the main circuit's heat radiation. Multiple reinforcing ribs are designed at the bottom of the baffle to enhance its strength. A large rectangular hole in the center allows the baffle to fit over the top shell, exposing only two long rectangular holes for European-style terminal connections. This relatively enclosed space protects the front and rear connecting plates and their connected wiring. A circular perforation is also included in the baffle for the opening / closing indicator rods to pass through.

[0124] In summary, this invention provides an intelligent magnetically controlled low-voltage switchgear, comprising a magnetically controlled primary module and a blade-type secondary module. The magnetically controlled primary module includes a first bottom shell, a first top shell, a plastic shell baffle, and a bottom plate, which together form the entire housing frame. This invention enables automatic opening and closing of circuit breakers within the original size requirements of manual plastic shell circuit breakers, directly replacing existing old switches in distribution areas. The opening and closing speed is significantly increased, mechanical performance is improved, and the space capacity of the secondary control module is effectively increased, achieving a high degree of intelligence. The primary and secondary modules are modularly designed, the secondary module is heat-insulated, and the secondary control module is pluggable, allowing for uninterrupted power replacement of the secondary module, improving product maintenance capabilities. The primary and secondary modules have the same service life, greatly extending the device's lifespan. Easily damaged secondary components can be individually plugged in and out, improving the device's flexibility. This invention demonstrates high scientific rigor and logical consistency.

[0125] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An intelligent magnetically controlled low-voltage switch, characterized in that, The intelligent magnetically controlled low-voltage switch includes a magnetically controlled primary module and a blade-type secondary module. The magnetically controlled primary module includes a first bottom shell, a first top shell, a plastic shell baffle, and a bottom plate. The first bottom shell, the first top shell, the plastic shell baffle, and the bottom plate form the entire shell frame. The upper two ends of the first top shell are designed with nut holes for installing the blade-type secondary module of the second bottom shell. The lower part of the magnetically controlled primary module includes a power supply side terminal, an arc-extinguishing grid, a moving knife assembly, a magnetic control mechanism, a stationary knife, a copper busbar, a protective current transformer, a measuring current transformer, a square sheet, a load side terminal, a thin paper sheet, and a long thin sheet. The moving tool assembly includes: a moving tool, an isolation tool sleeve, an overtravel spring, an overtravel spring base, a first pin, a moving tool base, a centering spring base, a centering spring, a second pin, a small bearing, and a third pin. The magnetic control mechanism includes: an insulating rotating shell, a rotating table, a first baffle, a magnetic control shell, a guide post, a guide block, a support base, a drive shaft, a small torsion spring, a fixed rod, an upper magnetic ring, a coil, a lower magnetic ring, an upper sealing ring, a lower sealing ring, a base plate, a guide sleeve, and a guide rod. The upper magnetic ring is fixed to the first baffle by bolts. The drive shaft is installed inside the middle of the lower magnetic ring. The lower magnetic ring is located below the upper magnetic ring and surrounds the coil together with the upper magnetic ring. A flat-head bolt passes through the bottom of the lower magnetic ring and is fixedly connected to the drive shaft. A guide rod and a drive screw are fixedly installed on the base plate. The drive screw is connected to the guide block. The guide block passes through the drive screw, and spring washers and nuts are fastened on both sides respectively. Small bearings are installed at both ends of the third pin shaft. The small bearings are located in the empty spaces on both sides of the guide block. The first bottom shell is used to install primary circuit components and magnetic control mechanism. The first bottom shell includes a through hole for installing stationary knife, a rectangular block for supporting stationary knife, an isolation baffle, and a through hole for installing moving knife base. The stationary blade includes a threaded hole for connecting to the first bottom shell, a cylindrical threaded hole for connecting to the power supply side terminal, and a stationary blade contact. The first bottom shell has a rectangular protrusion, and the stationary tool has a corresponding groove. The bolts are installed from the bottom of the first bottom shell upwards, passing through the first bottom shell and the stationary blade in sequence; Two bolts pass through the first bottom shell and the moving tool base in sequence from the bottom of the first bottom shell upwards, and are fastened to the threaded hole of the moving tool base. Two other bolts pass through the first bottom shell, the moving tool base, and the copper busbar in sequence from the bottom of the first bottom shell upwards, and are fastened to the threaded hole of the copper busbar.

2. The intelligent magnetically controlled low-voltage switch according to claim 1, characterized in that, The moving blade assembly is installed in the middle of the first bottom shell, and the moving blade base in the moving blade assembly is installed on the first bottom shell.

3. The intelligent magnetically controlled low-voltage switch according to claim 2, characterized in that, The first bottom shell is designed with an isolation baffle structure. The moving blade of the moving blade assembly passes through the isolation baffle during the swinging process. The isolation baffle is used for arc isolation. A limit plate structure is designed in the middle of the first bottom shell to limit the isolation blade sleeve.

4. The intelligent magnetically controlled low-voltage switch according to claim 3, characterized in that, The first bottom shell is designed with four large through holes for fixing the entire magnetically controlled low-voltage switch to the branch box or other equipment by bolts. The upper surface of the first bottom shell is also provided with multiple rectangular protrusions, and multiple annular protrusions are also provided at the nut mounting hole position connecting the first top shell, which are used to limit the movement when the first bottom shell and the first top shell are combined. A single row of long grooves is provided on one side of the first bottom shell for mounting supplementary electronic components. Multiple rows of long grooves are designed on the other side of the first bottom shell for mounting N-pole components in the 3P+N configuration. Multiple locking grooves are designed at both ends of the first bottom shell for expanding the connection of zero-sequence current transformer modules. A wiring groove is designed at the bottom of the first base shell. The magnetically controlled low-voltage switch adopts dual-side voltage draw. Among the six bolts connecting the stationary knife on the power supply side, one bolt is taken from each phase for voltage sampling, and the other bolt in each phase is used to install a thermistor for temperature measurement.

5. The intelligent magnetically controlled low-voltage switch according to claim 4, characterized in that, The first top shell also includes: nut holes for installing the front connecting plate, nut holes for installing the rear connecting plate, nut holes for installing the second bottom shell, nut holes for installing the third baffle, a stepped groove for installing the opening and closing indicator rod, a wiring groove, a groove for installing the auxiliary contact switch, a rectangular hollow groove, an N pole channel, nut holes for pressing the N pole wire, and nut holes for fixing the N pole small copper busbar. The first top shell also includes: terminal holes, grooves for limiting the first bottom shell, locking grooves, bolt holes for fixing the magnetically controlled low-voltage switch, raised outer shell, circular leakage holes, and contact leakage holes.

6. The intelligent magnetically controlled low-voltage switch according to claim 5, characterized in that, The magnetically controlled primary module also includes auxiliary contacts and a very small copper busbar.

7. The intelligent magnetically controlled low-voltage switch according to claim 6, characterized in that, The auxiliary contact switch is installed in the groove of the first top shell for mounting the auxiliary contact switch. The auxiliary contact inside extends out from the contact hole of the first top shell. When the low-voltage switch is tripped, the isolating sleeve touches the auxiliary contact and drives the auxiliary contact to move, triggering the position signal.

8. The intelligent magnetically controlled low-voltage switch according to claim 7, characterized in that, The bottom of the plastic shell baffle is designed with multiple sets of reinforcing ribs to improve the strength of the baffle; The baffle has a large rectangular hole in the middle, so that the plastic baffle fits on the first top shell, leaving only two long rectangular holes for European-style terminal plugging exposed. The space is closed to protect the front connecting plate, the rear connecting plate and the circuit connected to them. The plastic shell baffle is designed with a circular hole for the upper and lower rods of the opening and closing indicator to pass through.

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