Miniature permanent magnet circuit breaker with watchdog function

Abstract

The invention discloses a small-sized permanent magnet circuit breaker with a watchdog function, and relates to the technical field of permanent magnet circuit breakers, the small-sized permanent magnet circuit breaker comprises a shell, a mounting rack is fixedly connected to the inner wall of the top of the shell, and a first trigger is fixedly connected to one side of the mounting rack; a second trigger is fixedly connected to the position, close to the first trigger, of one side of the shell, and a third trigger is fixedly connected to the position, close to the second trigger, of one side of the shell. According to the small permanent magnet circuit breaker with the watchdog function, the voltage difference between the two trigger terminals is zero, the switching coil stops working, the moving shaft slides leftwards, one end of the moving shaft penetrates through the two through holes and makes contact with the contact frame, the shell and the electric lead are connected with the second grounding wire, and the shell is connected with the ground through the second grounding wire; the voltage on the shell is removed, the switching coil recovers to work, the motion shaft returns to the original position, and the effect of automatically eliminating electric leakage caused by short circuit of the circuit breaker is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of small permanent magnetic circuit breakers, in particular to a small permanent magnetic circuit breaker with a watchdog function. Background Art

[0002] Circuit breakers play a vital role in the industrial field, and are mainly used to protect the safety of electrical equipment and circuits. With the continuous development of industrial automation and intelligence, the technology of circuit breakers is also rapidly advancing. In many industrial applications, circuit breakers are widely used in power systems, factory production lines and large-scale mechanical equipment. By real-time monitoring of current and voltage, potential faults can be identified in time to protect the safety of equipment and personnel. The application scope of circuit breakers has been further expanded, which has promoted its development in distributed energy systems.

[0003] When the casing is grounded, general circuit breakers cannot automatically eliminate the casing charge caused by the short circuit, which may lead to serious safety hazards. When the equipment casing is charged, people who touch these devices may suffer electric shock, especially in humid environments, the risk is more significant. In this case, the protection function of traditional circuit breakers fails to work and cannot cut off the circuit in time, increasing the possibility of equipment damage and personal injury. If the grounding fault cannot be quickly identified and handled, it may lead to a larger range of electrical failures and cannot meet actual needs. Summary of the invention

[0004] The present invention discloses a small permanent magnetic circuit breaker with a watchdog function, which aims to solve the problem that a general circuit breaker cannot automatically eliminate the casing being charged due to a short circuit, which may lead to serious safety hazards. When the device casing is charged, people who touch these devices may suffer electric shock, especially in a humid environment, the risk is more significant. In this case, the protection function of the traditional circuit breaker fails to work and the circuit cannot be cut off in time, increasing the possibility of equipment damage and personal injury. If the grounding fault cannot be quickly identified and handled, it may lead to a technical problem of electrical faults on a larger scale.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A small permanent magnetic circuit breaker with a watchdog function comprises a shell, a mounting frame is fixedly connected to the top inner wall of the shell, a first trigger is fixedly connected to one side of the mounting frame, a second trigger is fixedly connected to one side of the shell near the first trigger, a third trigger is fixedly connected to one side of the shell near the second trigger, a trigger rod is slidably connected to the inside of the first trigger, a trigger coil is respectively arranged inside the first trigger, a first signal terminal and a second signal terminal are respectively arranged on one side of the first trigger, a return spring is sleeved on one end of the trigger rod, and a first plug is slidably connected to the upper surface of one side of the mounting frame. The cam is an angular channel that is formed on a pair of camshafts and is used for guiding the moving element of the camshaft. The camshaft is connected to the camshaft by a thread. The camshaft is pivotally connected to the top of the pair of camshafts. The camshaft is pivotally connected to the top of the pair of camshafts. The camshaft is pivotally connected to the top of the pair of camshafts. A detection mechanism is installed on the top of the housing, and the detection mechanism is used to detect changes in current; A permanent magnet mechanism is installed inside the shell, and the permanent magnet mechanism is used to perform the action of cutting off the circuit; A contact mechanism is installed inside the detection mechanism, and the contact mechanism is used to maintain the connection of the circuit; A power connection mechanism is installed on the top of the contact mechanism inside the detection mechanism, and the power connection mechanism is used to connect and disconnect the circuit.

[0006] One end of the shell is fixedly connected to an insulating pad, one side of the insulating pad is fixedly connected to a safety box, one side of the safety box is provided with an inspection panel, a stabilizing plate is fixedly connected to the bottom inner wall of the safety box, the second grounding wire passes through the outer wall of the shell, and passes through the safety box to extend from the bottom of the driven safety box, the through-hole positions at the bottom of the first lifting block and the second lifting block are at the same height, two trigger terminals are provided at the bottom of the switching coil, one end of the conductive wire passes through the outer wall of the shell, an insulating sleeve is provided at the contact position between the conductive wire and the shell, one end of the conductive wire is electrically connected to a lightning protection net, a protection box is fixedly connected to the top of the shell, a plurality of protection sleeves are provided on the top of the protection box, a mounting plate is provided on one side of the shell, a wiring sleeve is provided on one side of the shell near the mounting plate, a status plate is provided on one side of the shell near the wiring sleeve, a controller is provided on the other side of the mounting frame, and a signal receiver is provided on the other side of the mounting frame near the controller.

[0007] The detection mechanism includes a plurality of insulating seats fixedly connected to the top of the shell, the interior of the insulating seats is a hollow structure, an output terminal is provided on one side of the insulating seat, one end of the output terminal is provided with two mounting holes, an inductor is provided inside one side of the insulating seat near the output terminal, the outside of the inductor is covered with an insulating skin, the bottom of the inductor is electrically connected to a signal line, one end of the first grounding wire and the second grounding wire are both grounded, and one end of the signal line is provided with a stabilizing ring.

[0008] The signal line is provided with a positive line and a negative line inside, and the positive line and the negative line are electrically connected to the first signal terminal and the second signal terminal respectively. There are two trigger terminals, one trigger terminal is electrically connected to the shell, and the other trigger terminal is externally connected to a voltage of 220V. The signal receiver is electrically connected to the controller.

[0009] The permanent magnet mechanism includes a fixed cylinder fixedly connected to the top inner wall of the shell, a permanent magnet ring is arranged inside the fixed cylinder, a sliding shaft is slidably connected to the center position of the permanent magnet ring, an action coil is sleeved on one end of the sliding shaft, the bottom of the action coil is electrically connected to a first action terminal and a second action terminal respectively, and a fixed plate is fixedly connected to the inner wall of one side of the shell.

[0010] The fixing plate is located at the bottom of the conductive wire, the shell is also made of metal conductive material, a plurality of openings are arranged at the top of the shell, the top ends of the sliding shafts extend from the openings respectively, and the first action terminal and the second action terminal are electrically connected to the controller respectively.

[0011] In a preferred embodiment, the contact mechanism includes an insulating cylinder fixedly connected to the top of the sliding shaft, the top of the insulating cylinder is slidably connected to a buffer rod, the bottom end of the buffer rod is provided with a buffer spring, and one end of the output end is electrically connected to a conductive plate.

[0012] An opening is provided on the upper surface of the conductive plate, and the buffer rod passes through the opening, and there is no contact between the conductive plate and the buffer rod.

[0013] The power connection mechanism includes an insulating protective cover fixedly connected to the top inner wall of the insulating seat, a cavity is arranged inside the insulating protective cover, the top of the insulating protective cover is slidably connected to the power transmission end, the bottom of the insulating protective cover is slidably connected to the sliding end, the top edge of the sliding end is provided with a matching sleeve, the top end of the sliding end is sleeved with a protective tube, and the top inner wall of the insulating protective cover is fixedly connected to an insulating shell.

[0014] The protective tube is made of an insulating material. The insulating shell and the matching sleeve slide relative to each other, isolating the inside of the insulating shell and other spaces inside the insulating protective cover. The bottom of the sliding end is slidably connected with the top of the buffer rod.

[0015] It can be seen from the above that the small permanent magnetic circuit breaker with watchdog function provided by the present invention has the following technical effects.

[0016] First: the shell is connected through a trigger terminal and the other trigger terminal is connected to 220V. The voltage difference between the three-phase electricity and the ground is 220V, and the phase difference between each phase is 380V. The short circuit and the bottom of the first grounding wire are fused at the position where they contact the ground, so that the trigger terminal connected to the shell is also 220V, and the voltage difference between the two trigger terminals is zero. The switching coil stops working, so that the moving shaft slides to the left under the elastic force of the reset spring. After the first lifting block and the second lifting block slide downward, one end of the moving shaft passes through the two through holes and contacts the contact frame, so that the shell, the conductive wire and the second grounding wire are connected, and the voltage on the shell is guided to the second grounding wire, which is connected to the ground through the second grounding wire to remove the voltage on the shell. After the shell is de-energized, the switching coil resumes working, so that the moving shaft returns to its original position, which automatically eliminates the leakage caused by the short circuit of the circuit breaker.

[0017] Second: The first is that the third trigger and the second trigger are triggered, and the trigger coils inside the third trigger and the second trigger are triggered, so that the trigger rods inside the third trigger and the second trigger slide downward to squeeze the return spring, so that the first lifting block and the second lifting block slide downward at the same time, so that the through hole position and the moving axis are at the same height. Since the short circuit may cause the shell to be charged, the electricity on the shell is conducted to the ground through the fixing plate and the first grounding wire to prevent the shell from being charged and causing an accident.

[0018] Third: During the contact between the transmission end and the sliding end, an arc will be generated. As the sliding end drives the matching sleeve to slide upward, the matching sleeve and the insulating shell move relative to each other, closing the space inside and outside the insulating shell, so that the arc is extinguished inside the insulating shell, preventing the arc from overflowing and penetrating the insulating protection cover and the insulating shell to cause short circuit and leakage accidents, thereby achieving the effect of extinguishing the arc and protecting the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front structural schematic diagram of a small permanent magnetic circuit breaker with a watchdog function proposed by the present invention.

[0020] Figure 2 This is a schematic diagram of the rear structural view of the small permanent magnetic circuit breaker with a watchdog function proposed by the present invention.

[0021] Figure 3 This is a schematic diagram of the external cross-sectional structure of a small permanent magnetic circuit breaker with a watchdog function proposed by the present invention.

[0022] Figure 4 This is a schematic diagram of the internal cross-sectional structure of a small permanent magnetic circuit breaker with a watchdog function proposed by the present invention.

[0023] Figure 5 This is a schematic diagram of the partial cross-sectional structure of a small permanent magnetic circuit breaker with a watchdog function proposed by the present invention.

[0024] Figure 6 This is a schematic diagram of the internal structure of a small permanent magnetic circuit breaker with a watchdog function proposed by the present invention.

[0025] Figure 7 This is a schematic diagram of the partial structure of a small permanent magnetic circuit breaker with a watchdog function proposed by the present invention.

[0026] Figure 8 This is a schematic diagram of the motion axis structure of a small permanent magnetic circuit breaker with a watchdog function proposed by the present invention.

[0027] In the figure: 1, shell; 2, conductive wire; 3, status board; 4, wiring sleeve; 5, installation plate; 6, safety box; 7, lightning protection net; 8, protective cover; 9, protection box; 10, installation hole; 11, fixing tube; 12, insulating tube; 13, output end; 14, inductor; 15, insulating protective cover; 16, insulating seat; 17, controller; 18, signal receiver; 19, transmission end; 20, insulating shell; 21, sliding end; 22, matching sleeve; 23, conductive plate; 24, buffer spring; 25, permanent magnet ring; 26, action coil; 27, first action terminal; 28, second action terminal; 29, fixing plate ; 30. Signal line; 31. Insulation skin; 32. Protective tube; 33. Insulation pad; 34. Stabilizing ring; 35. First grounding wire; 36. Mounting frame; 37. Second grounding wire; 38. Stabilizing plate; 39. Inspection plate; 40. Sliding shaft; 41. Moving shaft; 42. First lifting block; 43. First trigger; 44. Second lifting block; 45. Second trigger; 46. Trigger rod; 47. First signal terminal; 48. Trigger coil; 49. Second signal terminal; 50. Return spring; 51. Third trigger; 52. Contact frame; 53. First plug rod; 54. Reset spring; 55. Switching coil. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] The small permanent magnetic circuit breaker with a watchdog function disclosed in the present invention is mainly used when the general circuit breaker cannot automatically eliminate the casing electrification caused by the short circuit, which may lead to serious safety hazards. When the device casing is electrified, people who touch these devices may suffer electric shock, especially in a humid environment, the risk is more significant. In this case, the protection function of the traditional circuit breaker fails to work and the circuit cannot be cut off in time, increasing the possibility of equipment damage and personal injury. If the ground fault cannot be quickly identified and handled, it may lead to a wider range of electrical failure scenarios.

[0030] Reference Figure 1 — Figure 8A small permanent magnetic circuit breaker with a watchdog function comprises a shell 1, a mounting frame 36 is fixedly connected to the top inner wall of the shell 1, a first trigger 43 is fixedly connected to one side of the mounting frame 36, a second trigger 45 is fixedly connected to one side of the shell 1 near the first trigger 43, a third trigger 51 is fixedly connected to one side of the shell 1 near the second trigger 45, a trigger rod 46 is slidably connected to the inside of the first trigger 43, the second trigger 45 and the third trigger 51, a trigger coil 48 is arranged inside the first trigger 43, the second trigger 45 and the third trigger 51, a first signal terminal 47 and a second signal terminal 49 are arranged on one side of the first trigger 43, the second trigger 45 and the third trigger 51, a return spring 50 is sleeved on one end of the trigger rod 46, and an upper surface of one side of the mounting frame 36 is provided. A first plug rod 53 is slidably connected, a second plug rod is arranged on the upper surface of one side of the mounting frame 36 near the first plug rod 53, a second lifting block 44 is fixedly connected to the top of the first plug rod 53, a first lifting block 42 is fixedly connected to the top of the second plug rod, through holes are respectively arranged on one side of the bottom of the first lifting block 42 and the second lifting block 44, a mounting shell is fixedly connected to the upper surface of the bottom of one side of the mounting frame 36, a moving shaft 41 is slidably connected inside the mounting shell, a return spring 54 is sleeved on one end of the moving shaft 41, a switching coil 55 is arranged inside the mounting shell, the other end of the moving shaft 41 is electrically connected to the first grounding wire 35, one end of the first grounding wire 35 is fixedly connected to the conductive wire 2, a contact frame 52 is arranged on the upper surface of the bottom of one side of the mounting frame 36 near the first plug rod 53, and one side of the contact frame 52 is electrically connected to the second grounding wire 37; A detection mechanism is installed on the top of the housing 1, and the detection mechanism is used to detect the change of current; A permanent magnet mechanism is installed inside the housing 1, and the permanent magnet mechanism is used to perform the action of cutting off the circuit; A contact mechanism is installed inside the detection mechanism, and the contact mechanism is used to maintain the connection of the circuit; A power connection mechanism is installed on the top of the contact mechanism inside the detection mechanism, and the power connection mechanism is used to connect and disconnect the circuit.

[0031] An insulating pad 33 is fixedly connected to one end of the shell 1, a safety box 6 is fixedly connected to one side of the insulating pad 33, an inspection plate 39 is arranged on one side of the safety box 6, a stabilizing plate 38 is fixedly connected to the inner wall of the bottom of the safety box 6, a second grounding wire 37 passes through the outer wall of the shell 1, and penetrates the safety box 6 to extend from the bottom of the driven safety box 6, the through-hole positions at the bottom of the first lifting block 42 and the second lifting block 44 are at the same height, two trigger terminals are arranged at the bottom of the switching coil 55, one end of the conductive wire 2 passes through the outer wall of the shell 1, an insulating sleeve is arranged at the contact position between the conductive wire 2 and the shell 1, one end of the conductive wire 2 is electrically connected to a lightning protection net 7, a protective box 9 is fixedly connected to the top of the shell 1, and a plurality of protective sleeves 8 are arranged on the top of the protective box 9, a mounting plate 5 is arranged on one side of the shell 1, a wiring sleeve 4 is arranged on one side of the shell 1 near the mounting plate 5, a status plate 3 is arranged on one side of the shell 1 near the wiring sleeve 4, a controller 17 is arranged on the other side of the mounting frame 36, and a signal receiver 18 is arranged on the other side of the mounting frame 36 near the controller 17.

[0032] The detection mechanism includes a plurality of insulating seats 16 fixedly connected to the top of the housing 1. The interior of the insulating seat 16 is a hollow structure. An output terminal 13 is provided on one side of the insulating seat 16. Two mounting holes 10 are provided at one end of the output terminal 13. An inductor 14 is provided inside one side of the insulating seat 16 near the output terminal 13. An insulating skin 31 is sleeved on the outside of the inductor 14. A signal line 30 is electrically connected to the bottom of the inductor 14. One end of the first grounding wire 35 and one end of the second grounding wire 37 are both grounded. A stabilizing ring 34 is provided at one end of the signal line 30.

[0033] The signal line 30 is provided with a positive line and a negative line inside, and the positive line and the negative line are electrically connected to the first signal terminal 47 and the second signal terminal 49 respectively. There are two trigger terminals, one trigger terminal is electrically connected to the housing 1, and the other trigger terminal is externally connected to a voltage of 220V. The signal receiver 18 is electrically connected to the controller 17. The model of the signal receiver 18 is "H7910 5G", and the model of the controller 17 is "S7-1200".

[0034] The permanent magnet mechanism includes a fixed cylinder 11 fixedly connected to the top inner wall of the outer shell 1, a permanent magnet ring 25 is arranged inside the fixed cylinder 11, a sliding shaft 40 is slidably connected to the center position of the permanent magnet ring 25, an action coil 26 is sleeved on one end of the sliding shaft 40, and the bottom of the action coil 26 is electrically connected to the first action terminal 27 and the second action terminal 28 respectively, and a fixed plate 29 is fixedly connected to the inner wall of one side of the outer shell 1.

[0035] The fixing plate 29 is located at the bottom of the conductive wire 2. The material of the shell 1 is also a metal conductive material. A plurality of openings are arranged at the top of the shell 1. The top ends of the sliding shafts 40 extend out from the openings respectively. The first action terminal 27 and the second action terminal 28 are electrically connected to the controller 17 respectively.

[0036] Among them, each pole of the three-phase electricity is connected to the top of each transmission terminal 19, each insulating seat 16 has a transmission terminal 19 inside, and each output terminal 13 is an output terminal of the three-phase electricity. When a short circuit occurs between each phase of the three-phase electricity, the internal circuit of the short-circuited output terminal 13 increases instantaneously. According to the inductance principle, in order to prevent the magnetic flux change caused by the internal current change of the output terminal 13, the inductor 14 forms a magnetic field opposite to the outside of the output terminal 13, and a voltage is formed at both ends of the inductor 14. The voltage is transmitted to the first signal terminal 47 and the second signal terminal 49 through the positive line and the negative line inside the signal line 30 respectively. The three output terminals 13 and the three inductors 14 are respectively connected to the first signal terminal 47 and the second signal terminal 49 on the first trigger 43, the second trigger 45 and the third trigger 51. The internal current of the two output terminals 13 changes, so that the trigger coils 48 in the first trigger 43, the second trigger 45 and the third trigger 51 generate a magnetic field, which drives the trigger rod 46 to slide downward and compress the return spring 50.

[0037] Among them, the inductor 14 of different specifications can be flexibly selected according to the actual application requirements. It accurately measures the circuit current and transmits the signal to the control unit to provide key data for fault judgment.

[0038] The circuit current changes are monitored in real time through the current transformer. When a single-phase grounding fault occurs, specific current signal characteristics such as the zero-sequence current will change. A phase-to-phase short-circuit fault will manifest as an abnormal increase in the phase-to-phase current. The control unit analyzes and judges these current signals in real time.

[0039] What needs to be explained more is that there are three situations. The first is that the third trigger 51 and the second trigger 45 are triggered, and the trigger coil 48 inside the third trigger 51 and the second trigger 45 is triggered, so that the trigger rod 46 inside the third trigger 51 and the second trigger 45 slides downward to squeeze the return spring 50, so that the first lifting block 42 and the second lifting block 44 slide downward at the same time, so that the through hole position and the moving shaft 41 are at the same height. Since the short circuit may cause the shell 1 to be energized, the electricity on the shell 1 is conducted to the ground through the fixing plate 29 and the first grounding wire 35. The second is that the first trigger 43 and the second trigger 45 are triggered. Similarly, the through hole position and the moving shaft 41 are at the same height. The third is that the third trigger 51 and the first trigger 43 are triggered. Similarly, the through hole position and the moving shaft 41 are at the same height.

[0040] Further, in the case of single-phase leakage of three-phase electricity, when there is a current change at a single output terminal 13, only when the trigger rod 46 inside the second trigger 45 is triggered to press downward by the output terminal 13 in the middle can the first lifting block 42 and the second lifting block 44 slide down simultaneously. When the first trigger 43 and the third trigger 51 are triggered alone, they cannot make the first lifting block 42 and the second lifting block 44 slide down simultaneously. Since the output terminal 13 that triggers the second trigger 45 is installed in the middle position, there is a greater possibility that the second trigger 45 will be triggered and cause a short circuit. Since the housing 1 is grounded, a short circuit or leakage will make the housing 1 charged. The housing 1 conducts the electricity to the ground, making the housing 1 non-conductive. In the event of a serious short circuit or lightning strike causing the bottom of the first grounding wire 35 to melt at the position where it contacts the ground, the connection between the housing 1 and the ground is disconnected, and the housing 1 is charged at this time.

[0041] In this embodiment, one trigger terminal is connected to the housing 1, and the other trigger terminal is connected to 220V. The voltage difference between the three-phase electricity and the ground is 220V, and the difference between each phase is 380V. A short circuit and the melting of the bottom of the first grounding wire 35 at the position where it contacts the ground make the trigger terminal connected to the housing 1 also 220V, so that the voltage difference between the two trigger terminals is zero. The switching coil 55 stops working, causing the moving shaft 41 to slide to the left under the elastic force of the return spring 54. After the first lifting block 42 and the second lifting block 44 both slide down, one end of the moving shaft 41 passes through the two through holes and contacts the contact frame 52, connecting the housing 1, the conducting wire 2, and the second grounding wire 37, guiding the voltage on the housing 1 to the second grounding wire 37, and connecting to the ground through the second grounding wire 37 to remove the voltage on the housing 1. After the housing 1 is de-energized, the switching coil 55 resumes operation, causing the moving shaft 41 to return to its original position, achieving the effect of automatically eliminating the leakage caused by a short circuit of the circuit breaker.

[0042] Further, the controller 17 can record the circuit and voltage data on multiple output terminals 13 and send out signals through the signal receiver 18. Maintenance personnel can receive the signals at the terminal to remotely check the status of the circuit breaker. A display can be installed on the mounting plate 5 to continuously display the voltage and current data inside the circuit breaker. There are two light beads inside the status board 3. When the circuit breaker is internally disconnected, the light bead under the "Open" character on the left lights up. When the circuit breaker is internally closed, the light bead under the "Closed" character on the right lights up, achieving the effect of displaying the status of the circuit breaker.

[0043] Refer to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 7In a preferred embodiment, the contact mechanism includes an insulating cylinder 12 fixedly connected to the top of the sliding shaft 40, a buffer rod is slidably connected to the top of the insulating cylinder 12, a buffer spring 24 is provided at the bottom end of the buffer rod, and one end of the output end 13 is electrically connected to a conductive plate 23.

[0044] An opening is provided on the upper surface of the conductive plate 23 , and the buffer rod passes through the opening, and there is no contact between the conductive plate 23 and the buffer rod.

[0045] The power connection mechanism includes an insulating protective cover 15 fixedly connected to the top inner wall of the insulating seat 16, a cavity is arranged inside the insulating protective cover 15, the top of the insulating protective cover 15 is slidably connected to the power transmission end 19, the bottom of the insulating protective cover 15 is slidably connected to the sliding end 21, the top edge of the sliding end 21 is provided with a matching sleeve 22, the top end of the sliding end 21 is sleeved with a protective tube 32, and the top inner wall of the insulating protective cover 15 is fixedly connected to an insulating shell 20.

[0046] The protective tube 32 is an insulating material. The insulating shell 20 and the matching sleeve 22 slide relative to each other, isolating the inside of the insulating shell 20 and other spaces inside the insulating protective cover 15. The bottom of the sliding end 21 is slidably connected to the top of the buffer rod.

[0047] In this embodiment, after an accident occurs, maintenance personnel can also remotely control the permanent magnet mechanism, the power connection mechanism and the contact mechanism through the signal receiver 18 to cut off the input of three-phase electricity. When the signal is sent, the first action terminal 27 and the second action terminal 28 are energized, and the action coil 26 generates a magnetic field opposite to the permanent magnet ring 25, causing the sliding shaft 40 and the insulating tube 12 to slide upward, driving the buffer rod to stop moving, and the buffer spring 24 is compressed by the relative movement between the insulating tube 12 and the buffer rod, which has a buffering effect and prevents damage to the mechanism.

[0048] Among them, the circuit breaker can be equipped with an intelligent controller to realize the "four remote" functions of remote control, remote measurement, remote signaling, and remote adjustment through the communication interface. Users can remotely control the opening and closing of the circuit breaker, obtain operating parameters, understand the working status and remotely adjust parameters, thereby improving the level of intelligent management of the power system.

[0049] Furthermore, the conductive plate 23 slides relative to the bottom of the sliding end 21 but does not separate. The buffer rod squeezes the bottom of the sliding end 21 to lift the sliding end 21, and the sliding end 21 contacts the transmission end 19, thereby connecting the circuit between the transmission end 19 and the output end 13 to achieve the connection of three-phase electricity. Similarly, the circuit between the output end 13 and the transmission end 19 can be disconnected, thereby achieving the effect of automatically controlling the connection and disconnection of the three-phase electricity.

[0050] What needs to be explained is that, in the process of contact between the transmission end 19 and the sliding end 21, an arc will be generated. Since the sliding end 21 drives the matching sleeve 22 to slide upward, the matching sleeve 22 and the insulating shell 20 move relative to each other, closing the space inside and outside the insulating shell 20, so that the arc is extinguished inside the insulating shell 20, preventing the arc from overflowing and breaking through the insulating protection cover 15 and the insulating shell 20 to cause short circuit and leakage accidents, thereby achieving the effect of extinguishing the arc and protecting the circuit.

[0051] Among them, the present invention adopts a permanent magnet mechanism, which is based on a highly reliable bistable permanent magnet technology. This mechanism has a simple structure and does not require complicated maintenance work, which greatly reduces maintenance costs. The mechanical life is up to 30,000 times, ensuring the reliability of long-term use. Its energy storage motor has low power, low energy consumption for opening and closing, and the transmission adopts a direct-acting transmission mode, with fewer parts, which improves the reliability of operation; Once a fault is detected, the control unit immediately triggers the permanent magnetic operating mechanism to operate. For a single-phase grounding fault, the permanent magnetic operating mechanism causes the circuit breaker to quickly cut off the faulty phase. In the event of a phase-to-phase short circuit fault, the faulty phases are quickly isolated to prevent the fault scope from expanding and ensure the normal operation of the rest of the power system.

[0052] Working principle: When in use, each pole of the three-phase electricity is connected to the top of each transmission terminal 19, each insulating seat 16 has a transmission terminal 19 inside, and each output terminal 13 is the output terminal of the three-phase electricity. When a short circuit occurs between each phase of the three-phase electricity, the internal circuit of the short-circuited output terminal 13 increases instantaneously. According to the inductance principle, in order to prevent the change of magnetic flux caused by the change of the internal current of the output terminal 13, the inductor 14 forms a magnetic field opposite to the outside of the output terminal 13, and a voltage is formed at both ends of the inductor 14. The voltage is transmitted to the first signal terminal 47 and the second signal terminal 49 through the positive line and the negative line inside the signal line 30 respectively. The three output terminals 13 and the three inductors 14 are respectively connected to the first trigger 43 and the second trigger 49. The first signal terminal 47 and the second signal terminal 49 on the trigger 45 and the third trigger 51, wherein the internal current of the two output terminals 13 changes, so that the trigger coil 48 in the first trigger 43, the second trigger 45 and the third trigger 51 generates a magnetic field, driving the trigger rod 46 to slide downward and compressing the return spring 50. There are three situations. The first situation is that the third trigger 51 and the second trigger 45 are triggered, and the trigger coil 48 inside the third trigger 51 and the second trigger 45 is triggered, so that the trigger rod 46 inside the third trigger 51 and the second trigger 45 slides downward and squeezes the return spring 50, so that the first lifting block 42 and the second lifting block 44 slide downward at the same time, so that the through hole position and the motion shaft 41 are at the same height. Due to the short circuit, external The shell 1 is charged, and the electricity on the shell 1 is conducted to the ground through the fixing plate 29 and the first grounding wire 35. The second is that the first trigger 43 and the second trigger 45 are triggered. Similarly, the through hole position and the moving shaft 41 are at the same height. The third is that the third trigger 51 and the first trigger 43 are triggered. Similarly, the through hole position and the moving shaft 41 are at the same height. The other situation is a single phase leakage of the three-phase electricity. When a current change occurs at a single output terminal 13, only when the output terminal 13 in the middle triggers the trigger rod 46 inside the second trigger 45 to squeeze downward, can the first lifting block 42 and the second lifting block 44 slide down at the same time. When the first trigger 43 and the third trigger 51 are triggered alone, neither the first lifting block 42 and the second lifting block 44 can slide down. The lifting block 44 slides down at the same time. Since the output terminal 13 that triggers the second trigger 45 is installed in the middle position, it is very likely that the second trigger 45 will be triggered and a short circuit will occur. Since the shell 1 is grounded, a short circuit or leakage will make the shell 1 charged. The shell 1 will pass the electricity to the ground, making the shell 1 non-conductive. In the event of a serious short circuit or lightning strike, the bottom of the first grounding wire 35 will fuse at the position where it contacts the ground, disconnecting the shell 1 from the ground. The shell 1 is now charged. The shell 1 is connected through a trigger terminal, and the other trigger terminal is connected to 220V. The voltage difference between the three-phase electricity and the ground is 220V, and the phase difference between each phase is 380V. The short circuit and the position where the bottom of the first grounding wire 35 contacts the ground will fuse, making the trigger terminal connected to the shell 1 also 220V.The voltage difference between the two trigger terminals is made zero, and the switching coil 55 stops working. As a result, the moving shaft 41 slides leftward under the elastic force of the reset spring 54. After both the first lifting block 42 and the second lifting block 44 slide downward, one end of the moving shaft 41 passes through the two through holes and contacts the contact holder 52, connecting the housing 1, the conductive wire 2, and the second grounding wire 37. The voltage on the housing 1 is directed to the second grounding wire 37 and connected to the ground through the second grounding wire 37, achieving the removal of the voltage on the housing 1. After the housing 1 is de-energized, the switching coil 55 resumes working, causing the moving shaft 41 to return to its original position, achieving the effect of automatically eliminating the leakage caused by a short circuit in the circuit breaker. The controller 17 can record the circuit and voltage data on the multiple output terminals 13 and send out signals through the signal receiver 18. Maintenance personnel can receive the signals at the terminal and remotely check the status of the circuit breaker. A display can be installed on the mounting plate 5 to continuously display the voltage and current data inside the circuit breaker. There are two light beads inside the status board 3. When the circuit breaker is internally disconnected, the light bead under the "open" character on the left lights up. When the circuit breaker is internally connected, the light bead under the "closed" character on the right lights up, achieving the effect of indicating the status of the circuit breaker. After an accident occurs, maintenance personnel can also remotely control the permanent magnet mechanism, the power connection mechanism, and the contact mechanism through the signal receiver 18 to cut off the three-phase power input. When the signal is sent out, the first action terminal 27 and the second action terminal 28 are energized, and the action coil 26 generates a magnetic field opposite to that of the permanent magnet ring 25, causing the sliding shaft 40 and the insulating cylinder 12 to slide upward. After the buffer rod stops moving, the buffer spring 24 is compressed by the relative movement between the insulating cylinder 12 and the buffer rod, achieving a buffering effect and preventing damage to the mechanism. The conductive plate 23 slides relative to the bottom of the sliding end 21 but does not separate. The buffer rod presses the bottom of the sliding end 21 to lift the sliding end 21, and the sliding end 21 contacts the power transmission end 19, conducting the circuit between the power transmission end 19 and the output terminal 13 and achieving the connection of the three-phase power. The circuit between the output terminal 13 and the power transmission end 19 can be disconnected, achieving the effect of automatically controlling the connection and disconnection of the three-phase power. During the contact between the power transmission end 19 and the sliding end 21, an electric arc is generated. Since the sliding end 21 drives the mating sleeve 22 to slide upward, the mating sleeve 22 moves relative to the insulating housing 20, closing the space inside and outside the insulating housing 20 and causing the electric arc to extinguish inside the insulating housing 20, preventing the electric arc from overflowing and breaking through the insulating protective cover 15 and the insulating housing 20, resulting in short circuit and leakage accidents, and achieving the effect of arc extinguishing and protecting the circuit.

[0053] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A small permanent magnetic circuit breaker with a watchdog function, comprising a housing (1), characterized in that: A mounting frame (36) is fixedly connected to the inner wall of the top of the housing (1); a first trigger (43) is fixedly connected to one side of the mounting frame (36); a second trigger (45) is fixedly connected to one side of the housing (1) at a position close to the first trigger (43); a third trigger (51) is fixedly connected to one side of the housing (1) at a position close to the second trigger (45); a trigger rod (46) is slidably connected to the inside of the first trigger (43), the second trigger (45) and the third trigger (51); a trigger coil (48) is provided inside the first trigger (43), the second trigger (45) and the third trigger (51); a first signal terminal (47) and a second signal terminal (49) are provided on one side of the first trigger (43), the second trigger (45) and the third trigger (51); a return spring (50) is sleeved on one end of the trigger rod (46); a first plug rod (51) is slidably connected to the upper surface of one side of the mounting frame (36); 3), a second plug rod is arranged on the upper surface of one side of the mounting frame (36) at a position close to the first plug rod (53), a second lifting block (44) is fixedly connected to the top of the first plug rod (53), a first lifting block (42) is fixedly connected to the top of the second plug rod, through holes are respectively arranged on one side of the bottom of the first lifting block (42) and the second lifting block (44), a mounting shell is fixedly connected to the upper surface of the bottom of one side of the mounting frame (36), a moving shaft (41) is slidably connected to the interior of the mounting shell, a return spring (54) is sleeved on one end of the moving shaft (41), a switching coil (55) is arranged inside the mounting shell, the other end of the moving shaft (41) is electrically connected to the first grounding wire (35), one end of the first grounding wire (35) is fixedly connected to the conductive wire (2), a contact frame (52) is arranged on the upper surface of the bottom of one side of the mounting frame (36) at a position close to the first plug rod (53), and one side of the contact frame (52) is electrically connected to the second grounding wire (37); A detection mechanism is installed on the top of the housing (1), and the detection mechanism is used to detect changes in current; A permanent magnet mechanism is installed inside the housing (1), and the permanent magnet mechanism is used to perform an action of cutting off the circuit; A contact mechanism is installed inside the detection mechanism, and the contact mechanism is used to maintain the connection of the circuit; A power connection mechanism is installed on the top of the contact mechanism inside the detection mechanism, and the power connection mechanism is used to connect and disconnect the circuit.

2. The small permanent magnetic circuit breaker with watchdog function according to claim 1, characterized in that: An insulating pad (33) is fixedly connected to one end of the housing (1), a safety box (6) is fixedly connected to one side of the insulating pad (33), an inspection plate (39) is provided on one side of the safety box (6), a stabilizing plate (38) is fixedly connected to the inner wall of the bottom of the safety box (6), the second grounding wire (37) passes through the outer wall of the housing (1), penetrates through the safety box (6) and extends out from the bottom of the driven safety box (6), the through holes at the bottom of the first lifting block (42) and the second lifting block (44) are at the same height, two trigger terminals are provided at the bottom of the switching coil (55), one end of the conductive wire (2) passes through the outer wall of the housing (1), and the conductive wire (2) An insulating sleeve is provided at a contact position with the housing (1); one end of the conductive wire (2) is electrically connected to a lightning protection net (7); a protective box (9) is fixedly connected to the top of the housing (1); a plurality of protective sleeves (8) are provided on the top of the protective box (9); a mounting plate (5) is provided on one side of the housing (1); a wiring sleeve (4) is provided on one side of the housing (1) near the mounting plate (5); a status plate (3) is provided on one side of the housing (1) near the wiring sleeve (4); a controller (17) is provided on the other side of the mounting frame (36); and a signal receiver (18) is provided on the other side of the mounting frame (36) near the controller (17).

3. The small permanent magnetic circuit breaker with watchdog function according to claim 2, characterized in that: The detection mechanism comprises a plurality of insulating seats (16) fixedly connected to the top of the housing (1); the interior of the insulating seats (16) is a hollow structure; an output end (13) is provided on one side of the insulating seat (16); one end of the output end (13) is provided with two mounting holes (10); an inductor (14) is provided inside one side of the insulating seat (16) near the output end (13); the outside of the inductor (14) is covered with an insulating skin (31); the bottom of the inductor (14) is electrically connected to a signal line (30); one end of the first grounding line (35) and one end of the second grounding line (37) are both grounded; and one end of the signal line (30) is provided with a stabilizing ring (34).

4. The small permanent magnetic circuit breaker with watchdog function according to claim 3, characterized in that: The signal line (30) is provided with a positive line and a negative line respectively, and the positive line and the negative line are electrically connected to the first signal terminal (47) and the second signal terminal (49) respectively. There are two trigger terminals, one of which is electrically connected to the housing (1) and the other is externally connected to a voltage of 220V. The signal receiver (18) is electrically connected to the controller (17).

5. The small permanent magnetic circuit breaker with watchdog function according to claim 4, characterized in that: The permanent magnet mechanism comprises a fixed cylinder (11) fixedly connected to the top inner wall of the housing (1), a permanent magnet ring (25) being arranged inside the fixed cylinder (11), a sliding shaft (40) being slidably connected to the center of the permanent magnet ring (25), an action coil (26) being sleeved on one end of the sliding shaft (40), a first action terminal (27) and a second action terminal (28) being electrically connected to the bottom of the action coil (26), and a fixing plate (29) being fixedly connected to the inner wall of one side of the housing (1).

6. The small permanent magnetic circuit breaker with watchdog function according to claim 5, characterized in that: The fixing plate (29) is located at the bottom of the conductive wire (2). The material of the housing (1) is also a metallic conductive material. A plurality of openings are provided at the top of the housing (1). The top ends of the sliding shafts (40) extend out from the openings respectively. The first action terminal (27) and the second action terminal (28) are electrically connected to the controller (17) respectively.

7. The small permanent magnetic circuit breaker with watchdog function according to claim 6, characterized in that: The contact mechanism comprises an insulating cylinder (12) fixedly connected to the top of the sliding shaft (40), the top of the insulating cylinder (12) being slidably connected to a buffer rod, the bottom end of the buffer rod being provided with a buffer spring (24), and one end of the output end (13) being electrically connected to a conductive plate (23).

8. The small permanent magnetic circuit breaker with watchdog function according to claim 7, characterized in that: An opening is provided on the upper surface of the conductive plate (23), and the buffer rod passes through the opening, so that there is no contact between the conductive plate (23) and the buffer rod.

9. The small permanent magnetic circuit breaker with a watchdog function according to claim 8, characterized in that: The power connection mechanism comprises an insulating protective cover (15) fixedly connected to the inner wall of the top of the insulating seat (16), a cavity being arranged inside the insulating protective cover (15), a power transmission end (19) being slidably connected to the top of the insulating protective cover (15), a sliding end (21) being slidably connected to the bottom of the insulating protective cover (15), a matching sleeve (22) being arranged on the top edge of the sliding end (21), a protective tube (32) being sleeved on the top end of the sliding end (21), and an insulating shell (20) being fixedly connected to the inner wall of the top of the insulating protective cover (15).

10. The small permanent magnetic circuit breaker with a watchdog function according to claim 9, characterized in that: The protective tube (32) is made of an insulating material. The insulating shell (20) and the matching sleeve (22) slide relative to each other, isolating the interior of the insulating shell (20) and other spaces inside the insulating protective cover (15). The bottom of the sliding end (21) is slidably connected to the top of the buffer rod.

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