Small permanent magnet circuit breaker with watchdog function

Abstract

The present invention discloses a small permanent magnet circuit breaker with a watchdog function, which relates to the technical field of small permanent magnet circuit breakers. It includes a housing, on the inner wall of the top of the housing, there is a fixedly connected mounting rack, on one side of the mounting rack, there is a fixedly connected first trigger, on one side of the housing near the first trigger, there is a fixedly connected second trigger, and on one side of the housing near the second trigger, there is a fixedly connected third trigger. The small permanent magnet circuit breaker with a watchdog function disclosed by the present invention makes the voltage difference between two trigger terminals zero, the switching coil stops working, causing the moving shaft to slide to the left. One end of the moving shaft passes through two through holes and contacts the contact frame, enabling the housing, the conducting wire, and the second grounding wire to be connected. Through the connection of the second grounding wire to the ground, the voltage on the housing is removed, the switching coil resumes working, and the moving shaft returns to its original position, achieving the effect of automatically eliminating the electric leakage caused by the short circuit of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet circuit breakers, and particularly to a small permanent magnet circuit breaker with a watchdog function. Background Art

[0002] Circuit breakers play a crucial role in the industrial field, 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 has also advanced rapidly. In many industrial applications, circuit breakers are widely used in power systems, factory production lines, and large-scale mechanical equipment. By monitoring current and voltage in real time, potential faults can be identified in a timely manner, thereby protecting the safety of equipment and personnel. The application scope of circuit breakers has been further expanded, promoting their development in distributed energy systems.

[0003] In the case of a housing ground fault, a general circuit breaker cannot automatically eliminate the live housing caused by a short circuit, which may lead to serious safety hazards. When the device housing is live, the personnel touching these devices may be electrocuted, especially in a humid environment, and the risk is more significant. In this case, the protection function of the traditional circuit breaker fails to play a role and cannot cut off the circuit in a timely manner, increasing the possibility of equipment damage and personnel injury. If the ground fault cannot be quickly identified and processed, it may lead to a wider range of electrical faults and cannot meet the actual needs. Summary of the Invention

[0004] The present invention discloses a small permanent magnet circuit breaker with a watchdog function, aiming to solve the technical problems that a general circuit breaker cannot automatically eliminate the live housing caused by a short circuit, which may lead to serious safety hazards. When the device housing is live, the personnel touching these devices may be electrocuted, especially in a humid environment, and the risk is more significant. In this case, the protection function of the traditional circuit breaker fails to play a role and cannot cut off the circuit in a timely manner, increasing the possibility of equipment damage and personnel injury. If the ground fault cannot be quickly identified and processed, it may lead to a wider range of electrical faults.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] Small permanent magnet circuit breaker with watchdog function, including a housing. On the inner wall of the top of the housing, there is a fixed mounting bracket. On one side of the mounting bracket, there is a fixed first trigger. On one side of the housing, close to the first trigger, there is a fixed second trigger. On one side of the housing, close to the second trigger, there is a fixed third trigger. Inside the first trigger, second trigger, and third trigger, there are respectively sliding trigger rods. Inside the first trigger, second trigger, and third trigger, there are respectively trigger coils. On one side of the first trigger, second trigger, and third trigger, there are respectively a first signal terminal and a second signal terminal. One end of the trigger rod is sleeved with a return spring. On the upper surface of one side of the mounting bracket, there is a sliding first plug rod. On the upper surface of one side of the mounting bracket, close to the first plug rod, there is a second plug rod. The top of the first plug rod is fixedly connected with a second lifting block. The top of the second plug rod is fixedly connected with a first lifting block. On one side of the bottom of the first lifting block and the second lifting block, there are respectively through holes. On the upper surface of the bottom of one side of the mounting bracket, there is a fixed mounting shell. Inside the mounting shell, there is a sliding moving shaft. One end of the moving shaft is sleeved with a return spring. Inside the mounting shell, there is a switching coil. The other end of the moving shaft is electrically connected to a first ground wire. One end of the first ground wire is fixedly connected with a conducting wire. On the upper surface of the bottom of one side of the mounting bracket, close to the first plug rod, there is a contact bracket. One side of the contact bracket is electrically connected to a second ground wire;

[0007] A detection mechanism is installed on the top of the housing, and the detection mechanism is used to detect the change of current;

[0008] A permanent magnet mechanism is installed inside the housing, and the permanent magnet mechanism is used to perform the action of cutting off the circuit;

[0009] A contact mechanism is installed inside the detection mechanism, and the contact mechanism is used to keep the circuit connected;

[0010] An electricity connection mechanism is installed on the top of the contact mechanism inside the detection mechanism, and the electricity connection mechanism is used to connect and disconnect the circuit.

[0011] One end of the said outer shell is fixedly connected with an insulating pad. One side of the insulating pad is fixedly connected with a safety box. One side of the safety box is provided with a maintenance board. A stabilizing board is fixedly connected to the bottom inner wall of the safety box. The second grounding wire passes through the outer wall of the outer shell and extends out from the bottom of the safety box after passing through the safety box. The heights of the through-hole positions at the bottoms of the first lifting block and the second lifting block are the same. There are two trigger terminals arranged at the bottom of the switching coil. One end of the conducting wire passes through the outer wall of the outer shell. An insulating sleeve is arranged at the contact position between the conducting wire and the outer shell. One end of the conducting wire is electrically connected to a lightning protection net. A protection box is fixedly connected to the top of the outer shell. A plurality of protective sleeves are arranged on the top of the protection box. An installation board is arranged on one side of the outer shell. A wiring sleeve is arranged on one side of the outer shell near the installation board. A status board is arranged on one side of the outer shell near the wiring sleeve. A controller is arranged on the other side of the mounting rack. A signal receiver is arranged on the other side of the mounting rack near the controller.

[0012] The said detection mechanism includes a plurality of insulating seats fixedly connected to the top of the outer shell. The inside of the insulating seat is a hollow structure. One side of the insulating seat is provided with an output end. There are two mounting holes arranged at one end of the output end. An inductance coil is arranged inside one side of the insulating seat near the output end. An insulating skin is sleeved outside the inductance coil. One end of the inductance coil is electrically connected to a signal wire. One ends of the first grounding wire and the second grounding wire are both grounded. A stabilizing ring is arranged at one end of the signal wire.

[0013] A positive wire and a negative wire are respectively arranged inside the signal wire. The positive wire is electrically connected to the first signal terminal, and the negative wire is electrically connected to the second signal terminal. There are two trigger terminals. One trigger terminal is electrically connected to the outer shell, and the other trigger terminal is externally connected to a 220V voltage. The signal receiver is electrically connected to the controller.

[0014] The said permanent magnet mechanism includes a fixed cylinder fixedly connected to the top inner wall of the outer shell. A permanent magnet ring is arranged inside the fixed cylinder. A sliding shaft is slidably connected to the central position of the permanent magnet ring. An action coil is sleeved at one end of the sliding shaft. The bottom of the action coil is respectively electrically connected to a first action terminal and a second action terminal. A fixing plate is fixedly connected to one side inner wall of the outer shell.

[0015] The fixing plate is located at the bottom of the conducting wire. The material of the outer shell is also a metal conductive material. A plurality of openings are arranged at the top position of the outer shell. The top ends of the sliding shafts respectively extend out from the openings. The first action terminal and the second action terminal are respectively electrically connected to the controller.

[0016] In a preferred embodiment, the contact mechanism includes an insulating cylinder fixedly connected to the top of the sliding shaft. A buffer rod is slidably connected to the top of the insulating cylinder. A buffer spring is provided at the bottom end of the buffer rod. One end of the output end is electrically connected to a conductive plate.

[0017] An opening is provided on the upper surface of the conductive plate. The buffer rod passes through the opening, and there is no contact between the conductive plate and the buffer rod.

[0018] The power connection mechanism includes an insulating protective cover fixedly connected to the inner wall of the top of the insulating seat. A cavity is provided inside the insulating protective cover. A power transmission end is slidably connected to the top of the insulating protective cover. A sliding end is slidably connected to the bottom of the insulating protective cover. A mating sleeve is provided at the top edge of the sliding end. A protective cylinder is sleeved on the top end of the sliding end. An insulating shell is fixedly connected to the inner wall of the top of the insulating protective cover.

[0019] The protective cylinder is made of an insulating material. The insulating shell and the mating sleeve slide relative to each other, isolating the interior of the insulating shell and other spaces inside the insulating protective cover. The bottom of the sliding end is slidably connected to the top of the buffer rod.

[0020] As can be seen from the above, the small permanent magnet circuit breaker with watchdog function provided by the present invention has the following technical effects.

[0021] First: One trigger terminal is connected to the outer shell, and the other trigger terminal is connected to 220V. The voltage differences between the three-phase electricity and the ground are all 220V, and the difference between each phase is 380V. The bottom of the short circuit and the first grounding wire in contact with the ground melts, making the trigger terminal connected to the outer shell also 220V, so that the voltage difference between the two trigger terminals is zero. The switching coil stops working, causing the moving shaft to slide to the left under the elastic force of the return spring. After both 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, connecting the outer shell, the conducting wire, and the second grounding wire, guiding the voltage on the outer shell to the second grounding wire, and connecting to the ground through the second grounding wire to remove the voltage on the outer shell. After the outer shell is de-energized, the switching coil resumes operation, causing the moving shaft to return to its original position, achieving the effect of automatically eliminating the electric leakage caused by the short circuit of the circuit breaker.

[0022] Second: The first type is that the third trigger and the second trigger are triggered. The trigger coils inside the third trigger and the second trigger are triggered, causing the trigger rods inside the third trigger and the second trigger to slide downward and compress the return spring, causing the first lifting block and the second lifting block to slide downward simultaneously, making the through hole position at the same height as the moving shaft. Since the short circuit may cause the outer shell to be charged, the electricity on the outer shell is guided to the ground through the fixing plate and the first grounding wire to prevent accidents caused by the charged outer shell.

[0023] Thirdly, during the process of the power transmission end contacting the sliding end, an electric arc will be generated. Since the sliding end drives the mating sleeve to slide upward, the mating sleeve and the insulating shell move relative to each other, closing the space inside and outside the insulating shell, causing the electric arc to extinguish inside the insulating shell, preventing the electric arc from overflowing and breaking through the insulating protective cover and the insulating shell to cause short - circuit and electric leakage accidents, and achieving the effects of arc extinguishing and protecting the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The front - view structural schematic diagram of the small - sized permanent - magnet circuit breaker with watchdog function proposed by the present invention.

[0025] Figure 2 The rear - view structural schematic diagram of the small - sized permanent - magnet circuit breaker with watchdog function proposed by the present invention.

[0026] Figure 3 The external sectional structural schematic diagram of the small - sized permanent - magnet circuit breaker with watchdog function proposed by the present invention.

[0027] Figure 4 The internal sectional structural schematic diagram of the small - sized permanent - magnet circuit breaker with watchdog function proposed by the present invention.

[0028] Figure 5 The partial sectional structural schematic diagram of the small - sized permanent - magnet circuit breaker with watchdog function proposed by the present invention.

[0029] Figure 6 The internal structural schematic diagram of the small - sized permanent - magnet circuit breaker with watchdog function proposed by the present invention.

[0030] Figure 7 The partial structural schematic diagram of the small - sized permanent - magnet circuit breaker with watchdog function proposed by the present invention.

[0031] Figure 8 The structural schematic diagram of the moving shaft of the small - sized permanent - magnet circuit breaker with watchdog function proposed by the present invention.

[0032] In the figure: 1. Outer shell; 2. Conductive wire; 3. Status board; 4. Wiring sleeve; 5. Mounting plate; 6. Safety box; 7. Lightning protection net; 8. Protective sleeve; 9. Protection box; 10. Mounting hole; 11. Fixed cylinder; 12. Insulating cylinder; 13. Output terminal; 14. Inductive coil; 15. Insulating protective cover; 16. Insulating seat; 17. Controller; 18. Signal receiver; 19. Power transmission terminal; 20. Insulating shell; 21. Sliding terminal; 22. Fitting sleeve; 23. Conductive plate; 24. Buffer spring; 25. Permanent magnet ring; 26. Action coil; 27. First action terminal; 28. Second action terminal; 29. Fixed plate; 30. Signal wire; 31. Insulating skin; 32. Protection cylinder; 33. Insulating pad; 34. Stabilizing ring; 35. First ground wire; 36. Mounting bracket; 37. Second ground wire; 38. Stabilizing plate; 39. Maintenance 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 bracket; 53. First plug rod; 54. Reset spring; 55. Switching coil. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] The small permanent magnet circuit breaker with watchdog function disclosed in the present invention is mainly applied to the situation where the outer shell of a general circuit breaker cannot automatically eliminate the electrification caused by a short circuit, which may lead to serious safety hazards. When the outer shell of the device is electrified, the personnel touching these devices may be electrocuted, especially in a humid environment, and the risk is more significant. In this case, the protection function of the traditional circuit breaker fails to play a role and cannot cut off the circuit in time, increasing the possibility of equipment damage and personal injury. If the ground fault cannot be quickly identified and processed, it may lead to a wider range of electrical faults.

[0035] Refer to Figure 1 — Figure 8, a small permanent magnet circuit breaker with a watchdog function, includes a housing 1. On the inner wall of the top of the housing 1, a mounting bracket 36 is fixedly connected. On one side of the mounting bracket 36, a first trigger 43 is fixedly connected. On one side of the housing 1 near the first trigger 43, a second trigger 45 is fixedly connected. On one side of the housing 1 near the second trigger 45, a third trigger 51 is fixedly connected. Trigger rods 46 are respectively slidably connected inside the first trigger 43, the second trigger 45, and the third trigger 51. Trigger coils 48 are respectively arranged inside the first trigger 43, the second trigger 45, and the third trigger 51. First signal terminals 47 and second signal terminals 49 are respectively arranged on one side of the first trigger 43, the second trigger 45, and the third trigger 51. One end of the trigger rod 46 is sleeved with a return spring 50. A first plug rod 53 is slidably connected to the upper surface of one side of the mounting bracket 36. A second plug rod is arranged on the upper surface of one side of the mounting bracket 36 near the first plug rod 53. The top of the first plug rod 53 is fixedly connected with a second lifting block 44. The top of the second plug rod is fixedly connected with a first lifting block 42. Through holes are respectively arranged on one side of the bottoms of the first lifting block 42 and the second lifting block 44. An installation shell is fixedly connected to the upper surface of the bottom of one side of the mounting bracket 36. A moving shaft 41 is slidably connected inside the installation shell. One end of the moving shaft 41 is sleeved with a reset spring 54. A switching coil 55 is arranged inside the installation shell. The other end of the moving shaft 41 is electrically connected to a first ground wire 35. One end of the first ground wire 35 is fixedly connected with a conducting wire 2. A contact bracket 52 is arranged on the upper surface of the bottom of one side of the mounting bracket 36 near the first plug rod 53. One side of the contact bracket 52 is electrically connected to a second ground wire 37;

[0036] A detection mechanism is installed on the top of the housing 1, and the detection mechanism is used to detect current changes;

[0037] 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;

[0038] A contact mechanism is installed inside the detection mechanism, and the contact mechanism is used to keep the circuit connected;

[0039] An electricity connection mechanism is installed on the top of the contact mechanism inside the detection mechanism, and the electricity connection mechanism is used to connect and disconnect the circuit.

[0040] One end of the outer shell 1 is fixedly connected with an insulating pad 33. One side of the insulating pad 33 is fixedly connected with a safety box 6. A maintenance plate 39 is arranged on one side of the safety box 6. A stabilizing plate 38 is fixedly connected to the bottom inner wall of the safety box 6. The second ground wire 37 passes through the outer wall of the outer shell 1 and extends out from the bottom of the safety box 6 after passing through the safety box 6. The heights of the through-hole positions at the bottoms of the first lifting block 42 and the second lifting block 44 are the same. There are two trigger terminals arranged at the bottom of the switching coil 55. One end of the conducting wire 2 passes through the outer wall of the outer shell 1. An insulating sleeve is arranged at the contact position between the conducting wire 2 and the outer shell 1. One end of the conducting wire 2 is electrically connected to a lightning protection net 7. The top of the outer shell 1 is fixedly connected with a protection box 9. A plurality of protection sleeves 8 are arranged on the top of the protection box 9. An installation plate 5 is arranged on one side of the outer shell 1. A wiring sleeve 4 is arranged at a position close to the installation plate 5 on one side of the outer shell 1. A status plate 3 is arranged at a position close to the wiring sleeve 4 on one side of the outer shell 1. A controller 17 is arranged on the other side of the mounting bracket 36. A signal receiver 18 is arranged at a position close to the controller 17 on the other side of the mounting bracket 36.

[0041] The detection mechanism includes a plurality of insulating seats 16 fixedly connected to the top of the outer shell 1. The inside of the insulating seat 16 is a hollow structure. An output end 13 is arranged on one side of the insulating seat 16. Two mounting holes 10 are arranged at one end of the output end 13. An inductance coil 14 is arranged at a position close to the output end 13 inside one side of the insulating seat 16. An insulating skin 31 is sleeved outside the inductance coil 14. One end of the inductance coil 14 is electrically connected to a signal wire 30. One ends of the first ground wire 35 and the second ground wire 37 are both grounded. A stabilizing ring 34 is arranged at one end of the signal wire 30.

[0042] The signal wire 30 is internally provided with a positive wire and a negative wire respectively. The positive wire is electrically connected to the first signal terminal 47. The negative wire is electrically connected to the second signal terminal 49. There are two trigger terminals. One trigger terminal is electrically connected to the outer shell 1. The other trigger terminal is externally connected to a 220V voltage. The signal receiver 18 is electrically connected to the controller 17. The model of the signal receiver 18 is "H7910 5G". The model of the controller 17 is "S7-1200".

[0043] 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 central position of the permanent magnet ring 25. An action coil 26 is sleeved at one end of the sliding shaft 40. The bottom of the action coil 26 is electrically connected to a first action terminal 27 and a second action terminal 28 respectively. A fixing plate 29 is fixedly connected to the inner wall on one side of the outer shell 1.

[0044] The fixed plate 29 is located at the bottom of the conductive wire 2. The material of the outer shell 1 is also a metal conductive material. Multiple openings are provided at the top position of the outer shell 1, and the top ends of the sliding shafts 40 respectively extend out from the openings. The first moving terminal 27 and the second moving terminal 28 are respectively electrically connected to the controller 17.

[0045] Among them, each pole of the three-phase power is respectively connected to the top of each power transmission end 19. There is a power transmission end 19 inside each insulating seat 16. Each output end 13 is an output end of the three-phase power. When a short circuit occurs between each phase of the three-phase power, the internal circuit of the short-circuited output end 13 instantaneously increases. According to the inductance principle, in order to prevent the magnetic flux change caused by the change of the current inside the output end 13, the inductance coil 14 forms a magnetic field opposite to the outside of the output end 13, and a voltage is formed at both ends of the inductance coil 14. The voltage is respectively conducted to the first signal terminal 47 and the second signal terminal 49 through the positive wire and the negative wire inside the signal line 30. The three output ends 13 and the three inductance coils 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. When the current in two of the output ends 13 changes, the trigger coils 48 in the first trigger 43, the second trigger 45 and the third trigger 51 generate a magnetic field, driving the trigger rod 46 to slide downward and compressing the return spring 50.

[0046] Among them, different specifications of inductance coils 14 can be flexibly selected according to actual application requirements. It accurately measures the circuit current and transmits the signal to the control unit, providing key data for fault judgment.

[0047] The circuit current change is monitored in real time through a current transformer. When a single-phase grounding fault occurs, the characteristics of specific current signals such as zero-sequence current will change. When an inter-phase short-circuit fault occurs, it is manifested as an abnormal increase in the inter-phase current. The control unit analyzes and judges these current signals in real time.

[0048] What needs to be further explained is divided into three cases. The first case is that the third trigger 51 and the second trigger 45 are triggered. The trigger coils 48 inside the third trigger 51 and the second trigger 45 are triggered, causing the trigger rods 46 inside the third trigger 51 and the second trigger 45 to slide downward and squeeze the return spring 50, causing the first lifting block 42 and the second lifting block 44 to slide downward simultaneously, making the through hole position and the moving shaft 41 at the same height. Since the short circuit may cause the outer shell 1 to be charged, the electricity on the outer shell 1 is guided to the ground through the fixed plate 29 and the first ground wire 35. The second case 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 case 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.

[0049] Further, in other cases where a single phase of the three-phase power leaks electricity, when there is a current change at the single output terminal 13, only when the trigger rod 46 inside the second trigger 45 is triggered to press downward at the middle output terminal 13 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 independently, 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 makes the housing 1 charged. The housing 1 conducts the electricity to the ground, making the housing 1 non-conductive. When a serious short circuit or lightning strike causes the bottom of the first grounding wire 35 to melt at the position where it contacts the ground, disconnecting the housing 1 from the ground, the housing 1 is charged at this time.

[0050] 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 power 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, resulting in a zero voltage difference between the two trigger terminals. 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 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 of the circuit breaker.

[0051] 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, and 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.

[0052] Refer to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 7, in 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. One end of the output terminal 13 is electrically connected to a conductive plate 23.

[0053] An opening is provided on the upper surface of the conductive plate 23. The buffer rod passes through the opening, and there is no contact between the conductive plate 23 and the buffer rod.

[0054] The power connection mechanism includes an insulating protective cover 15 fixedly connected to the inner wall of the top of the insulating seat 16. A cavity is provided inside the insulating protective cover 15. A power transmission end 19 is slidably connected to the top of the insulating protective cover 15. A sliding end 21 is slidably connected to the bottom of the insulating protective cover 15. A mating sleeve 22 is provided at the top edge of the sliding end 21. A protective cylinder 32 is sleeved on the top end of the sliding end 21. An insulating shell 20 is fixedly connected to the inner wall of the top of the insulating protective cover 15.

[0055] The protective cylinder 32 is made of an insulating material. The insulating shell 20 and the mating 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.

[0056] 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 to cut off the input of three-phase electricity through the signal receiver 18. 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 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.

[0057] Among them, the circuit breaker can be matched with an intelligent controller to realize the "four remote" functions of remote control, remote measurement, remote signaling, and remote adjustment through a 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, improving the intelligent management level of the power system.

[0058] Furthermore, the conductive plate 23 and the bottom of the sliding end 21 slide relative to each other but do not separate. The buffer rod presses against the bottom of the sliding end 21 to lift the sliding end 21. The sliding end 21 contacts the power transmission end 19, conducting the circuit between the power transmission end 19 and the output terminal 13 to achieve the connection of three-phase electricity. Similarly, 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 three-phase electricity.

[0059] It should be further explained that during the contact process between the power transmission end 19 and the sliding end 21, an electric arc will be generated. Since the sliding end 21 drives the mating sleeve 22 to slide upward, the mating sleeve 22 and the insulating shell 20 move relative to each other, closing the space inside and outside the insulating shell 20, causing the electric arc to be extinguished inside the insulating shell 20, preventing the electric arc from overflowing and piercing the insulating protective cover 15 and the insulating shell 20 to cause short - circuit and leakage accidents, thus achieving the effect of arc extinguishing and protecting the circuit.

[0060] Among them, the present invention adopts a permanent - magnet mechanism, which is based on the highly reliable bi - stable permanent - magnet technology. This mechanism has a simple structure and does not require complex maintenance work, greatly reducing the maintenance cost. Its mechanical life is as high as 30,000 times, ensuring the reliability of long - term use. Its energy - storage motor has a small power, low energy consumption for opening and closing, and the transmission adopts a direct - acting transmission method with fewer components, improving the reliability of operation.

[0061] Once a fault is detected, the control unit immediately triggers the action of the permanent - magnet operating mechanism. For a single - phase grounding fault, the permanent - magnet operating mechanism makes the circuit breaker quickly cut off the faulty phase. In the case of an inter - phase short - circuit fault, it quickly isolates the faulty phases, preventing the expansion of the fault range and ensuring the normal operation of the rest of the power system.

[0062] Working principle: When in use, each pole of the three-phase power is respectively connected to the top of each power transmission end 19. There is a power transmission end 19 inside each insulating seat 16. Each output end 13 is the output end of the three-phase power. When a short circuit occurs between each phase of the three-phase power, the internal circuit of the short-circuited output end 13 instantaneously increases. According to the inductance principle, in order to prevent the magnetic flux change caused by the change of the current inside the output end 13, the inductance coil 14 forms a magnetic field opposite to the outside of the output end 13, and a voltage is formed at both ends of the inductance coil 14. The voltage is respectively conducted to the first signal terminal 47 and the second signal terminal 49 through the positive wire and the negative wire inside the signal line 30. The three output ends 13 and the three inductance coils 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. When the current inside two of the output ends 13 changes, the trigger coils 48 in the first trigger 43, the second trigger 45 and the third trigger 51 generate a magnetic field, driving the trigger rod 46 to slide downward, compressing the return spring 50. There are three cases. The first case is that the third trigger 51 and the second trigger 45 are triggered. The trigger coils 48 inside the third trigger 51 and the second trigger 45 are triggered, causing the trigger rods 46 inside the third trigger 51 and the second trigger 45 to slide downward and squeeze the return spring 50, so that the first lifting block 42 and the second lifting block 44 slide downward simultaneously, making the through hole position and the moving shaft 41 at the same height. Since a short circuit may cause the outer shell 1 to be electrified, the electricity on the outer shell 1 is guided to the ground through the fixing plate 29 and the first grounding wire 35. The second case 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 case 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. In other cases, when a single phase of the three-phase power leaks electricity, in the case of current change in a single output end 13, only when the trigger rod 46 inside the second trigger 45 of the output end 13 in the middle is triggered to slide downward and squeeze, can the first lifting block 42 and the second lifting block 44 slide downward 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 downward simultaneously. Since the output end 13 that triggers the second trigger 45 is installed in the middle position, the possibility of a short circuit also occurs when the second trigger 45 is triggered. Since the outer shell 1 is grounded, a short circuit or leakage makes the outer shell 1 electrified, and the outer shell 1 conducts the electricity to the ground, making the outer shell 1 non-conductive. When a serious short circuit or lightning strike causes the bottom of the first grounding wire 35 to be melted at the contact position with the ground, disconnecting the connection between the outer shell 1 and the ground, the outer shell 1 is electrified at this time. One trigger terminal is connected to the outer shell 1, and the other trigger terminal is connected to 220V. The voltage difference between the three-phase power 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 contact position with the ground make the trigger terminal connected to the outer 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 return 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 frame 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 electric leakage caused by the short circuit of 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. The 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, the maintenance personnel can also remotely control the permanent magnet mechanism, the power connection mechanism, and the contact mechanism to cut off the three-phase power input through the signal receiver 18. 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 process 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 shell 20, closing the space inside and outside the insulating shell 20, causing the electric arc to extinguish inside the insulating shell 20 and preventing the electric arc from overflowing and piercing the insulating protection cover 15 and the insulating shell 20, resulting in short circuit and electric leakage accidents, achieving the effect of arc extinguishing and protecting the circuit.

[0063] The above is only the preferred specific implementation manner 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, makes equivalent substitutions or changes, and all should be covered within 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 inside the detection mechanism at the top of the contact mechanism, and the power connection mechanism is used to connect and disconnect the circuit; 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); 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); two mounting holes (10) are provided at one end of the output end (13); an inductor is provided at a position near the output end (13) inside one side of the insulating seat (16); A coil (14), wherein the outer portion of the inductor coil (14) is covered with an insulating skin (31), the bottom of the inductor coil (14) is electrically connected to a signal line (30), the trigger terminals are two, a positive line and a negative line are respectively arranged inside the signal line (30), the positive line is electrically connected to a first signal terminal (47), and the negative line is electrically connected to a second signal terminal (49), one trigger terminal is electrically connected to a housing (1), and the other trigger terminal is externally connected to a voltage of 220V, and the housing (1) is also made of a metal conductive material.

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 the safety box (6) and extends out from the bottom of the safety box (6), one end of the conductive wire (2) passes through the outer wall of the housing (1), an insulating sleeve is provided at the contact position between the conductive wire (2) and the housing (1), and one end of the conductive wire (2) A lightning protection net (7) is electrically connected, a protection box (9) is fixedly connected to the top of the housing (1), a plurality of protection covers (8) are arranged on the top of the protection box (9), a mounting plate (5) is arranged on one side of the housing (1), a wiring cover (4) is arranged on one side of the housing (1) near the mounting plate (5), a status plate (3) is arranged on one side of the housing (1) near the wiring cover (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).

3. The small permanent magnetic circuit breaker with watchdog function according to claim 2, characterized in that: One end of the first grounding wire (35) and the second grounding wire (37) are both grounded, and one end of the signal wire (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 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), 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, and 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 a 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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