An environmentally friendly cabinet circuit breaker and its operation method

Abstract

The present invention provides an environmentally friendly cabinet circuit breaker and an operating method thereof, wherein an arc extinguishing chamber is provided in the circuit breaker housing, and an arc extinguishing chamber bracket and a plurality of parallel arranged arc extinguishing grids are provided in the arc extinguishing chamber, which effectively improves the arc extinguishing efficiency; the circuit breaker linkage mechanism is arranged on the front side of the arc extinguishing chamber, and comprises a contact seat, a moving contact and a static contact, and the moving contact can move linearly relative to the contact seat to realize the on-off control of the circuit; the conductive rod and the terminal block are connected by interference fit and bolt fastening to ensure stable current transmission; the opening and closing mechanism consists of an opening and closing electromagnet, a closing spring, an opening spring and a linkage component to realize fast and reliable opening and closing operations of the circuit breaker; in addition, multiple protection devices such as a tripper, an undervoltage tripper and an electromagnetic lock are also provided to improve the safety of the system; the present invention has a compact structure, reliable operation, good arc extinguishing effect, good environmental protection, safety and intelligent control capabilities, and is suitable for the application requirements of high-performance distribution equipment in modern power systems.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection cabinets, and in particular to an environmental protection cabinet circuit breaker and an operating method thereof. Background Art

[0002] In power systems, circuit breakers, as key control and protection devices, play a vital role in ensuring the safety and stability of power supply. With increasing environmental awareness and the power industry's increasing requirements for equipment performance, traditional circuit breakers have some shortcomings in practical applications.

[0003] The arc extinguishing chamber structure of traditional circuit breakers is relatively simple, resulting in limited arc extinguishing capabilities. Some arc extinguishing chambers lack proper arc quenching grids, or the number of grids is insufficient or their arrangement is illogical. This makes it difficult to quickly extinguish arcs generated during the opening and closing operations. Prolonged arcing not only causes severe contact erosion, shortening contact life and increasing equipment maintenance costs, but can also cause phase-to-phase short circuits, impacting the safe operation of the power system. Furthermore, untimely arc extinguishing can generate high overvoltages, damaging the insulation performance of power equipment and reducing equipment reliability. The opening and closing mechanisms of traditional circuit breakers typically utilize complex mechanical transmission structures with numerous components, making installation and commissioning difficult. These components are prone to wear and loosening during frequent opening and closing operations, resulting in reduced accuracy and reliability of the opening and closing operations. This poses a significant safety risk to the power system.

[0004] The connections between the contact base and the conductive rod, the conductive rod and the terminal block, and the terminal block and cable connector in traditional circuit breakers can be unreliable. Traditional circuit breakers lack effective grounding protection or have unreliable grounding methods. When a leakage occurs in the equipment, the current cannot be promptly diverted to the ground, posing a risk of electric shock to operators. Furthermore, circuit breakers lack dedicated lightning protection terminals. When a line is struck by lightning, the lightning current can severely damage the circuit breaker and related equipment, impacting the normal operation of the power system. Therefore, we propose an environmentally friendly cabinet circuit breaker and its operation method. Summary of the Invention

[0005] The purpose of the present invention is to address the problems raised by the existing background technology. In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions: an environmental protection cabinet circuit breaker, comprising a circuit breaker housing, a frame is provided inside the circuit breaker housing, a gap is provided between the outer periphery of the frame and the inner wall of the circuit breaker housing, an arc extinguishing chamber is provided inside the circuit breaker housing, an arc extinguishing chamber bracket is provided inside the arc extinguishing chamber, a circuit breaker linkage mechanism is provided on the front side of the arc extinguishing chamber, and the circuit breaker linkage mechanism cooperates with the circuit breaker opening and closing mechanism.

[0006] As a preferred technical solution of the present invention, the bottom of the arc extinguishing chamber is fitted with the upper surface of the arc extinguishing chamber bracket and fastened by bolts; a plurality of arc extinguishing grids arranged parallel to each other are provided inside the arc extinguishing chamber, and the two ends of the arc extinguishing grids are respectively fixedly connected to the inner walls on both sides of the arc extinguishing chamber.

[0007] As a preferred technical solution of the present invention, the circuit breaker linkage mechanism is provided with a contact base, and the contact base is provided with two mounting positions, on which a moving contact and a static contact are respectively installed. Contact points are provided on the moving contact and the static contact. The moving contact moves linearly relative to the contact base, and the static contact is fixedly connected to the contact base. The moving contact and the static contact are on the same plane.

[0008] As a preferred technical solution of the present invention, a connection hole is provided on the lower side of the contact base, a conductive rod is provided in the connection hole and is tightly connected through an interference fit; the other end of the conductive rod is connected to the terminal block through the through hole on the frame, the terminal block is mounted on the outer wall of the circuit breaker housing, and the terminal block and the conductive rod are fastened by bolts; a connection port is provided on the terminal block, and the connection port is pluggable connected to the cable connector.

[0009] As a preferred technical solution of the present invention, the circuit breaker opening and closing mechanism is provided with an opening and closing electromagnet and a closing spring, an opening spring and an opening rotating shaft, the opening and closing electromagnet is mounted on the mounting seat of the frame, one end of the closing spring is fixed to the spring fixing seat on the frame, and the other end is connected to one end of the closing rotating shaft, and the other end of the closing rotating shaft is mounted on the frame through a bearing; one end of the opening spring is fixed to another spring fixing seat of the frame, and the other end is connected to one end of the opening rotating shaft, and the other end of the opening rotating shaft is also mounted on the frame through a bearing; a half-shaft is provided on the side of the opening rotating shaft, and the output shaft of the opening and closing electromagnet is connected to one end of the half-shaft through a coupling; the half-shaft is hingedly connected to one end of the connecting plate, the other end of the connecting plate is hinged to one end of the transmission connecting rod, and the other end of the transmission connecting rod is hinged to the driving end of the moving contact; a camshaft is provided in the frame, and a cam is provided on the camshaft, and the outer peripheral contour of the cam is in contact with the half-shaft and the connecting plate.

[0010] As a preferred technical solution of the present invention, a threaded hole is provided at the bottom of the circuit breaker housing, a grounding bolt is provided in the threaded hole, and the head of the grounding bolt is exposed from the bottom surface of the circuit breaker housing; a connecting boss is provided on the outer side of the cable connector, and a cable lightning protection connection end is provided on the side.

[0011] As a preferred technical solution of the present invention, a plurality of fixing brackets are further provided on the frame, on which a tripper, an undervoltage tripper, and an electromagnetic lock are provided; the output ends of the tripper, the undervoltage tripper, and the electromagnetic lock are all connected to the half-shaft through a transmission member; an interlocking rod is installed on the frame through a rotating shaft, and an isolation copper rod is provided on the lower inner side of the frame.

[0012] As a preferred technical solution of the present invention, an insulating partition is provided in the frame, and a supporting insulator is inserted into the middle of the frame.

[0013] A method for operating an environmental protection cabinet circuit breaker includes the following steps: Step 1, preparation for closing operation: check whether the circuit breaker housing is damaged, whether the grounding bolt is firmly installed and the head is exposed from the bottom surface of the circuit breaker housing, so that the equipment is in a safe grounding state; check whether the cable connector and the connection port of the terminal block are properly plugged in and out, and whether the connection boss on the outer side of the cable connector and the cable lightning protection connection end are normal; check whether the release, undervoltage release, and electromagnetic lock components on the frame are firmly installed, and whether their output ends are properly connected to the transmission parts of the half shaft; check whether the interlocking rod and the isolation copper rod are in the normal position;

[0014] Step 2: Start the closing action: energize the opening and closing electromagnet. The output shaft of the opening and closing electromagnet drives the half-shaft to rotate through the coupling. When the half-shaft rotates, it drives the connecting plate hinged to it to move, and the connecting plate in turn drives the transmission connecting rod to move. The transmission connecting rod pushes the moving contact to make a linear motion relative to the contact base, so that the contact on the moving contact contacts the contact on the static contact, and the circuit breaker is closed.

[0015] Step 3: Spring energy storage and cam coordination: During the closing process, the closing spring is stretched and stored. One end of the spring is fixed to the spring fixing seat on the frame, and the other end is connected to the closing shaft, which rotates on the frame through a bearing. The outer contour of the cam on the camshaft inside the frame contacts and cooperates with the half shaft and the connecting plate, assisting in the stable closing action.

[0016] Step 4: Trigger the trip command: When the trip is required, the trip signal is triggered by the trip unit, undervoltage trip or electromagnetic lock; the output end of these components drives the half shaft to rotate through the transmission member;

[0017] Step 5: Tripping action execution: The half-shaft rotates to drive the connecting plate and the transmission connecting rod to move. The transmission connecting rod pulls the moving contact to make a linear motion relative to the contact seat, so that the contact on the moving contact is separated from the contact on the static contact, realizing the circuit breaker tripping;

[0018] Step 6: During the opening process, the opening spring releases energy. One end of the spring is fixed on the spring fixing seat of the frame, and the opening shaft connected to the other end rotates on the frame through the bearing to assist in the rapid completion of the opening action.

[0019] As a preferred technical solution of the present invention, it also includes inspection and maintenance: regularly open the circuit breaker casing, check whether the arc extinguishing grid in the arc extinguishing chamber is damaged or deformed, and whether the bolt connection between the bottom of the arc extinguishing chamber and the arc extinguishing chamber bracket is tight; regularly check whether the interference fit between the contact seat and the conductive rod is tight, whether the bolt connection between the conductive rod and the terminal block is loose, and whether the plug-in connection between the terminal block and the cable connector is good; check whether the insulating partitions and supporting insulators in the frame are cracked, damaged, and have poor insulation.

[0020] Compared with existing technologies, the present invention offers the following advantages: a gap is provided between the outer perimeter of the frame and the inner wall of the circuit breaker housing. This design not only provides ample space for the installation and maintenance of internal components, facilitating maintenance operations and reducing maintenance difficulty and costs, but also acts as a buffer, reducing the impact of external vibration and impact on the frame and internal components, thereby improving the stability and reliability of the equipment.

[0021] The bottom of the arc extinguishing chamber is tightly fitted to the upper surface of the arc extinguishing chamber bracket and fastened with bolts, ensuring the stability of the arc extinguishing chamber installation. Even under the vibration and arc shock generated by the frequent opening and closing of the circuit breaker, the arc extinguishing chamber can still maintain its correct position and condition, ensuring the normal performance of the arc extinguishing function and extending the service life of the arc extinguishing chamber.

[0022] The arc extinguishing chamber is equipped with multiple parallel arc-extinguishing grids. When the circuit breaker opens and an arc is generated, the arc enters the arc extinguishing chamber and is divided into multiple short arcs by the arc-extinguishing grids. The voltage drop of the short arc increases, and the arc extinguishing grids absorb the heat of the arc, causing the arc to cool rapidly, thereby accelerating the arc extinction. This effectively prevents arc damage to contacts and other components, and improves the opening and closing performance and service life of the circuit breaker.

[0023] The moving contact in the circuit breaker linkage mechanism moves linearly relative to the contact base, while the stationary contact is fixedly connected to the contact base, and both are coplanar. This design makes the moving contact's trajectory simple and clear, making it easy to control and accurately making and separating contact with the stationary contact, ensuring reliable circuit conduction and disconnection. The contact base is tightly connected to the conductive rod through an interference fit, which is then fastened to the terminal block with bolts. The terminal block is connected to the cable connector via a plug-and-socket connection. This multi-level, reliable connection ensures stable and safe current transmission, reduces contact resistance, and minimizes energy loss.

[0024] The circuit breaker's opening and closing mechanism utilizes a combination of an opening and closing electromagnet, a closing spring, an opening spring, and an opening shaft. The opening and closing electromagnet quickly responds to control signals, accurately rotating the half-shaft. This, in turn, drives the moving contact through the connecting plate and transmission connecting rod, achieving opening and closing operations.

[0025] The closing and opening springs store and release energy during the closing and opening processes, respectively, ensuring rapid and stable closing and opening operations. The cam on the camshaft, in contact with the half-shafts and connecting plate, further enhances the accuracy and reliability of the closing and opening operations.

[0026] A grounding bolt, with its head exposed above the bottom surface, securely grounds the circuit breaker housing. In the event of a leakage fault, the grounding bolt conducts the current to the ground, effectively preventing electric shock and ensuring the safety of both personnel and equipment.

[0027] A cable lightning protection connection terminal is set on the side of the cable connector. When the line is struck by lightning, the cable lightning protection connection terminal can introduce the lightning current into the ground, protecting the circuit breaker and related equipment from lightning damage, and improving the safety and reliability of the equipment in severe weather conditions.

[0028] The trip unit, undervoltage release, and electromagnetic lock protection devices installed on the frame monitor the current and voltage parameters in the circuit in real time. When an overload, short circuit, or undervoltage condition is detected, the output of these protection devices drives the half-shaft through the transmission element, rapidly opening the circuit breaker and disconnecting the circuit, protecting equipment and wiring from damage. The interlocking rod and isolation copper rod interlock the circuit breaker with other equipment, preventing misoperation and improving equipment safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of the present invention;

[0030] Figure 2 A schematic diagram of the internal structure provided by the present invention;

[0031] Figure 3 A schematic diagram of the structure of the cable lightning protection connection end provided by the present invention;

[0032] Figure 4 A schematic diagram of the cable connector structure provided by the present invention;

[0033] Figure 5 A schematic diagram of the contact structure provided by the present invention;

[0034] Figure 6 A schematic diagram of the cam structure provided by the present invention;

[0035] Figure 7 A schematic diagram of the opening and closing spring structure provided by the present invention;

[0036] Figure 8 A schematic diagram of the interlocking rod structure provided by the present invention;

[0037] Figure 9 This is a schematic diagram of the undervoltage tripping structure provided by the present invention.

[0038] Indicated in the figure:

[0039] 1. Circuit breaker housing; 2. Frame; 3. Arc extinguishing chamber; 4. Arc extinguishing grid; 5. Arc extinguishing chamber bracket; 6. Insulating partition; 7. Trip unit; 8. Contact; 9. Moving contact; 10. Stationary contact; 11. Contact holder; 12. Terminal block; 13. Cable connector; 14. Conductive rod; 15. Undervoltage release; 16. Electromagnetic lock; 17. Closing and opening electromagnet; 18. Closing spring; 19. Closing shaft; 20. Opening spring; 21. Opening shaft; 22. Half shaft; 23. Connecting plate; 24. Transmission connecting rod; 25. Camshaft; 26. Cam; 27. Support insulator; 28. Interlocking rod; 29. Grounding bolt; 30. Cable lightning protection connection end; 31. Isolating copper rod. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is a specific implementation of the present invention and is not limited to all embodiments.

[0041] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] Example 1: An environmental protection cabinet circuit breaker includes a circuit breaker housing 1, a frame 2 is provided inside the circuit breaker housing 1, a gap is provided between the outer periphery of the frame 2 and the inner wall of the circuit breaker housing 1, an arc extinguishing chamber 3 is provided inside the circuit breaker housing 1, an arc extinguishing chamber bracket 5 is provided inside the arc extinguishing chamber 3, and a circuit breaker linkage mechanism is provided on the front side of the arc extinguishing chamber 3, and the circuit breaker linkage mechanism cooperates with the circuit breaker opening and closing mechanism.

[0044] The bottom of the arc-extinguishing chamber 3 is in contact with the upper surface of the arc-extinguishing chamber bracket 5 and is fastened with bolts. A plurality of arc-extinguishing grids 4 are arranged parallel to each other within the arc-extinguishing chamber 3, with their ends fixedly connected to the inner walls of the arc-extinguishing chamber 3. The circuit breaker linkage mechanism is equipped with a contact base 11, which has two mounting positions, one for a moving contact 9 and the other for a stationary contact 10. Each of these two contacts is provided with contact points 8. The moving contact 9 moves linearly relative to the contact base 11, while the stationary contact 10 is fixedly connected to the contact base 11, with the moving contact 9 and the stationary contact 10 being coplanar.

[0045] A connection hole is provided on the lower side of the contact base 11, in which a conductive rod 14 is arranged and tightly connected through an interference fit; the other end of the conductive rod 14 passes through a through hole on the frame 2 and is connected to the terminal block 12, which is mounted on the outer wall of the circuit breaker housing 1, and the terminal block 12 and the conductive rod 14 are fastened by bolts; a connection port is provided on the terminal block 12, which is pluggable and connected to the cable connector 13.

[0046] The circuit breaker opening and closing mechanism is provided with an opening and closing electromagnet 17, a closing spring 18, an opening spring 20 and an opening shaft 21. The opening and closing electromagnet 17 is mounted on the mounting seat of the frame 2. One end of the closing spring 18 is fixed to the spring fixing seat on the frame 2, and the other end is connected to one end of the closing shaft 19. The other end of the closing shaft 19 is mounted on the frame 2 through a bearing; one end of the opening spring 20 is fixed to another spring fixing seat on the frame 2, and the other end is connected to one end of the opening shaft 21. The opening shaft 21 The other end of the drive link 24 is also mounted on the frame 2 through a bearing; a half-shaft 22 is provided on the side of the opening shaft 21, and the output shaft of the opening and closing electromagnet 17 is connected to one end of the half-shaft 22 through a coupling; the half-shaft 22 is hingedly connected to one end of the connecting plate 23, and the other end of the connecting plate 23 is hingedly connected to one end of the transmission connecting rod 24, and the other end of the transmission connecting rod 24 is hingedly connected to the driving end of the moving contact 9; a camshaft 25 is provided in the frame 2, and a cam 26 is provided on the camshaft 25, and the outer peripheral contour of the cam 26 is in contact with the half-shaft 22 and the connecting plate 23.

[0047] A threaded hole is provided at the bottom of the circuit breaker housing 1, in which a grounding bolt 29 is provided, and the head of the grounding bolt 29 is exposed from the bottom surface of the circuit breaker housing 1; a connecting boss is provided on the outside of the cable connector 13, and a cable lightning protection connection terminal 30 is provided on the side.

[0048] Frame 2 is also equipped with multiple mounting brackets, each equipped with a trip unit 7, an undervoltage release 15, and an electromagnetic lock 16. The outputs of the trip unit 7, undervoltage release 15, and electromagnetic lock 16 are all connected to the half-shaft 22 via a transmission element. An interlocking rod 28 is mounted on the frame 2 via a rotating shaft, and an isolation copper rod 31 is installed on the lower side of the frame 2. An insulating partition 6 is installed within the frame 2, and a support insulator 27 is inserted in the middle of the frame 2.

[0049] Working Principle of the Environmental Protection Cabinet Circuit Breaker: Opening and Closing Operation Principle: When closing is required, power is supplied to the opening and closing electromagnet 17. The output shaft of the opening and closing electromagnet 17 begins to rotate, driving the half-shaft 22 through the coupling. The rotation of the half-shaft 22 moves the hinged connecting plate 23, which in turn moves the transmission connecting rod 24. The transmission connecting rod 24 pushes the moving contact 9 in a linear motion relative to the contact base 11 until the contact point 8 on the moving contact 9 contacts the contact point 8 on the stationary contact 10, thereby closing the circuit breaker.

[0050] During the closing process, closing spring 18 is stretched to store energy. One end of closing spring 18 is fixed to the spring retainer on frame 2, and the other end is connected to closing shaft 19, which is mounted on frame 2 via a bearing. Simultaneously, the outer contour of cam 26 on camshaft 25 within frame 2 contacts and engages with half-shaft 22 and connecting plate 23, assisting their movement and ensuring stable closing.

[0051] Tripping process: The tripping operation can be triggered in a variety of ways. When the trip unit 7, undervoltage trip 15 or electromagnetic lock 16 detects an abnormal situation, their output ends drive the half-shaft 22 to rotate through the transmission member. It is also possible to directly apply a reverse current or control signal to the tripping and closing electromagnet 17 to cause the output shaft of the tripping and closing electromagnet 17 to rotate in the opposite direction, thereby driving the half-shaft 22 to rotate. The rotation of the half-shaft 22 drives the connecting plate 23 and the transmission connecting rod 24 to move. The transmission connecting rod 24 pulls the moving contact 9 to perform a linear motion relative to the contact seat 11, separating the contact 8 on the moving contact 9 from the contact 8 on the static contact 10, thereby achieving the tripping of the circuit breaker. During the tripping process, the tripping spring 20 releases energy. One end of the tripping spring 20 is fixed to the spring fixing seat of the frame 2, and the other end is connected to the tripping shaft 21. The tripping shaft 21 is mounted on the frame 2 through a bearing to assist in completing the tripping action quickly.

[0052] Circuit connection principle: The cable connector 13 is pluggable and connected to the connection port on the terminal block 12, which is mounted on the outer wall of the circuit breaker housing 1. The terminal block 12 is fastened to the conductive rod 14 with bolts. The other end of the conductive rod 14 passes through a through-hole in the frame 2 and connects tightly to the conductive rod 14 in the connection hole on the bottom of the contact base 11 through an interference fit. When the circuit breaker is closed, current flows from the cable connector 13, passes through the terminal block 12, conductive rod 14, contact base 11, and then through the movable contact 9 and fixed contact 10 to complete the circuit, achieving power transmission.

[0053] Arc Extinguishing Principle: When the circuit breaker opens, the moving contact 9 and the stationary contact 10 separate, generating an arc. The arc then enters the arc-extinguishing chamber 3, which contains multiple parallel arc-extinguishing grids 4. The arc is split into multiple short arcs by the arc-extinguishing grids 4, increasing the voltage drop across these short arcs. At the same time, the arc-extinguishing grids 4 absorb the arc's heat, rapidly cooling it and accelerating its extinguishing, effectively preventing arc damage to equipment.

[0054] Grounding bolt 29, with its head exposed above the bottom surface of the circuit breaker housing, reliably grounds the circuit breaker housing 1, preventing damage to personnel and equipment from leakage. Lightning arrester connector 30, located on the side of cable connector 13, connects to a lightning arrester. When a lightning strike strikes the line, it diverts the lightning current to the ground, protecting the equipment.

[0055] Trip unit 7, undervoltage release 15, and electromagnetic lock 16: They act as protective devices. When abnormal current and voltage parameters in the circuit are detected, they drive the half-shaft 22 to rotate through the transmission member to open the circuit breaker, thereby protecting the circuit and equipment.

[0056] Interlocking rod 28 and isolation copper rod 31 interlock the circuit breaker with other equipment, ensuring safe and correct operation. Insulating partition 6 within frame 2 and support insulator 27 inserted in the center provide electrical insulation and support, ensuring electrical isolation between components and preventing short-circuit failures.

[0057] Example 2: An operating method for an environmental protection cabinet circuit breaker, comprising the following steps: Step 1, preparation for closing operation: check whether the circuit breaker housing 1 is damaged, whether the grounding bolt 29 is securely installed and the head is exposed from the bottom surface of the circuit breaker housing 1, so that the equipment is in a safe grounding state; check whether the connection port of the cable connector 13 and the terminal block 12 is properly plugged in and out, and whether the connection boss on the outer side of the cable connector 13 and the cable lightning protection connection end 30 are normal; check whether the release 7, undervoltage release 15, and electromagnetic lock 16 components on the frame 2 are securely installed, and whether their output ends are properly connected to the transmission member of the half-shaft 22; check whether the interlocking rod 28 and the isolation copper rod 31 are in the normal position;

[0058] Step 2: Start the closing action: energize the opening and closing electromagnet 17. The output shaft of the opening and closing electromagnet 17 drives the half-shaft 22 to rotate through the coupling. When the half-shaft 22 rotates, it drives the connecting plate 23 hinged to it to move. The connecting plate 23 then drives the transmission connecting rod 24 to move. The transmission connecting rod 24 pushes the moving contact 9 to make a linear motion relative to the contact base 11, so that the contact 8 on the moving contact 9 contacts the contact 8 on the static contact 10, and the circuit breaker is closed.

[0059] Step 3: Spring energy storage and cam coordination: During the closing process, the closing spring 18 is stretched and stores energy. One end of the spring is fixed to the spring fixing seat on the frame 2. The other end is connected to the closing shaft 19, which rotates on the frame 2 through a bearing. The outer contour of the cam 26 on the camshaft 25 in the frame 2 contacts and cooperates with the half shaft 22 and the connecting plate 23, assisting in the stable closing action.

[0060] Step 4: Triggering the trip command: When tripping is required, the trip signal is triggered by the trip unit 7, the undervoltage trip 15 or the electromagnetic lock 16; the output ends of these components drive the half shaft 22 to rotate through the transmission member;

[0061] Step 5: Execution of the opening action: The half-shaft 22 rotates to drive the connecting plate 23 and the transmission connecting rod 24 to move. The transmission connecting rod 24 pulls the moving contact 9 to make a linear motion relative to the contact base 11, so that the contact 8 on the moving contact 9 is separated from the contact 8 on the static contact 10, realizing the opening of the circuit breaker;

[0062] Step 6: During the opening process, the opening spring 20 releases energy, one end of which is fixed on the spring fixing seat of the frame 2, and the opening shaft 21 connected to the other end rotates on the frame 2 through the bearing to assist in the rapid completion of the opening action.

[0063] Inspection and maintenance: Open the circuit breaker housing 1 regularly, check whether the arc extinguishing grid 4 in the arc extinguishing chamber 3 is damaged or deformed, and whether the bolt connection between the bottom of the arc extinguishing chamber 3 and the arc extinguishing chamber bracket 5 is tight; regularly check whether the interference fit between the contact seat 11 and the conductive rod 14 is tight, whether the bolt connection between the conductive rod 14 and the terminal block 12 is loose, and whether the plug-in connection between the terminal block 12 and the cable connector 13 is good; check whether the insulating partition 6 and the supporting insulator 27 in the frame 2 are cracked, damaged, or have poor insulation.

[0064] Working process of the environmental protection cabinet circuit breaker: Closing working process: Closing command triggering: When the circuit breaker needs to be closed, the operator sends a power-on signal to the opening and closing electromagnet 17. The opening and closing electromagnet 17 is installed on the mounting base of the frame 2, and its output shaft starts to rotate after power is applied.

[0065] Transmission Mechanism Operation: The output shaft of the opening and closing electromagnet 17 drives the half-shaft 22 through a coupling. The half-shaft 22 is hinged to one end of a connecting plate 23. Rotation of the half-shaft 22 drives the connecting plate 23. The other end of the connecting plate 23 is hinged to one end of a transmission connecting rod 24. Movement of the connecting plate 23 in turn drives the transmission connecting rod 24.

[0066] Moving Contact Movement: The other end of the transmission link 24 is hinged to the driving end of the moving contact 9. The movement of the transmission link 24 propels the moving contact 9 in linear motion relative to the contact base 11. The moving contact 9 and the stationary contact 10 are mounted on the contact base 11, respectively. The moving contact 9 and the stationary contact 10 are coplanar and both have contact points 8. As the moving contact 9 moves, the contact points 8 on the moving contact 9 gradually approach and eventually come into contact with the contact points 8 on the stationary contact 10, thereby completing the circuit conduction and the closing operation.

[0067] Spring energy storage and cam coordination: During the closing process, closing spring 18 is stretched to store energy. One end of closing spring 18 is fixed to the spring retainer on frame 2, and the other end is connected to one end of closing shaft 19. The other end of closing shaft 19 is mounted on frame 2 via a bearing. Simultaneously, the outer contour of cam 26 on camshaft 25 within frame 2 contacts and mates with half-shaft 22 and connecting plate 23, assisting their movement and ensuring stable and reliable closing.

[0068] Circuit connection: After closing the circuit breaker, current flows into the cable connector 13. The cable connector 13 is pluggable and connected to the connection port on the terminal block 12. The terminal block 12 is mounted on the outer wall of the circuit breaker housing 1 and fastened to the conductive rod 14 with bolts. One end of the conductive rod 14 is tightly connected to the connection hole on the bottom of the contact holder 11 through an interference fit, and the other end is connected to the terminal block 12 through a through-hole in the frame 2. The current passes through the cable connector 13, the terminal block 12, the conductive rod 14, the contact holder 11, the movable contact 9, and the fixed contact 10 in sequence, forming a closed circuit and achieving power transmission.

[0069] Tripping Operation: Triggering a Tripping Command: Tripping can be triggered by a variety of circumstances. When the trip unit 7 detects a circuit overload or short circuit, the undervoltage trip 15 detects insufficient voltage, or the electromagnetic latch 16 receives a specific control signal, their output terminals drive the axle 22 through a transmission element. Alternatively, a reverse current or control signal can be directly applied to the opening and closing electromagnet 17, causing its output shaft to rotate in the opposite direction, thereby driving the axle 22.

[0070] The transmission mechanism reverses motion: The rotation of the half-shaft 22 drives the connecting plate 23, which in turn drives the transmission link 24. At this point, the transmission link 24 pulls the moving contact 9 in a linear motion in the opposite direction relative to the contact base 11. The moving contact separates: As the moving contact 9 moves, the contact point 8 on the moving contact 9 separates from the contact point 8 on the stationary contact 10, disconnecting the circuit and completing the opening operation.

[0071] Spring Energy Release: During the opening process, the opening spring 20 releases energy. One end of the opening spring 20 is fixed to another spring holder on frame 2, and the other end is connected to one end of the opening shaft 21. The other end of the opening shaft 21 is mounted on frame 2 via a bearing. The energy released by the opening spring 20 helps to quickly complete the opening operation.

[0072] Arc Extinguishing Process: An arc is generated the moment the moving contact 9 and the stationary contact 10 separate. The arc enters the arc-extinguishing chamber 3, which is equipped with multiple parallel arc-extinguishing grids 4. The two ends of the arc-extinguishing grids 4 are fixedly connected to the inner walls of the arc-extinguishing chamber 3. The arc is split into multiple short arcs by the arc-extinguishing grids 4, increasing the voltage drop of the short arcs. At the same time, the arc-extinguishing grids 4 absorb the heat of the arc, causing it to cool rapidly, thereby accelerating the arc extinction and preventing damage to the equipment.

[0073] Grounding protection: A grounding bolt 29 is provided in the threaded hole at the bottom of the circuit breaker housing 1, with its head exposed at the bottom surface of the circuit breaker housing 1, which reliably grounds the circuit breaker housing 1 and prevents damage to personnel and equipment due to leakage during equipment operation.

[0074] Lightning protection: The cable connector 13 is provided with a connection boss on the outside and a cable lightning protection connection terminal 30 on the side. When the line is struck by lightning, the cable lightning protection connection terminal 30 conducts the lightning current into the ground, protecting the circuit breaker and related equipment from damage caused by lightning.

[0075] Interlocking and Isolation: The interlocking rod 28, mounted on the rotating shaft of frame 2, and the isolation copper rod 31 located on the lower inner side, interlock the circuit breaker with other equipment, ensuring safe and correct operation and preventing misoperation. Insulation Support: The insulating partition 6 installed within frame 2 and the support insulator 27 inserted in the middle provide electrical insulation and support, ensuring electrical isolation between components, preventing short-circuit failures, and ensuring stable and reliable operation of the circuit breaker.

[0076] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. An environmental protection cabinet circuit breaker, comprising a circuit breaker housing (1), wherein a frame (2) is provided inside the circuit breaker housing (1), and a gap is provided between the outer periphery of the frame (2) and the inner wall of the circuit breaker housing (1), characterized in that: An arc extinguishing chamber (3) is provided in the circuit breaker housing (1), an arc extinguishing chamber bracket (5) is provided in the arc extinguishing chamber (3), a circuit breaker linkage mechanism is provided on the front side of the arc extinguishing chamber (3), the circuit breaker linkage mechanism cooperates with the circuit breaker opening and closing mechanism, the circuit breaker linkage mechanism is provided with a contact seat (11), two mounting positions are provided on the contact seat (11), a moving contact (9) and a static contact (10) are respectively mounted thereon, contacts (8) are provided on the moving contact (9) and the static contact (10), the moving contact (9) makes a linear motion relative to the contact seat (11), the static contact (10) is fixedly connected to the contact seat (11), and the moving contact (9) and the static contact (10) are located on the same plane; A connection hole is provided on the lower side of the contact seat (11), a conductive rod (14) is provided in the connection hole and is tightly connected by interference fit; the other end of the conductive rod (14) passes through the through hole on the frame (2) and is connected to the terminal block (12), the terminal block (12) is mounted on the outer wall of the circuit breaker housing (1), and the terminal block (12) and the conductive rod (14) are fastened by bolts; a connection port is provided on the terminal block (12), and the connection port is pluggable connected to the cable connector (13); The circuit breaker opening and closing mechanism is provided with an opening and closing electromagnet (17), a closing spring (18), an opening spring (20), and an opening rotating shaft (21). The opening and closing electromagnet (17) is mounted on a mounting seat of the frame (2). One end of the closing spring (18) is fixed on a spring fixing seat on the frame (2), and the other end is connected to one end of the closing rotating shaft (19). The other end of the closing rotating shaft (19) is mounted on the frame (2) through a bearing. One end of the opening spring (20) is fixed on another spring fixing seat on the frame (2), and the other end is connected to one end of the opening rotating shaft (21). The other end of the opening rotating shaft (21) is also connected to the spring fixing seat. The bearing is mounted on the frame (2); a half-shaft (22) is provided on the side of the opening and closing electromagnet (17); the output shaft of the opening and closing electromagnet (17) is connected to one end of the half-shaft (22) through a coupling; the half-shaft (22) is hingedly connected to one end of the connecting plate (23); the other end of the connecting plate (23) is hingedly connected to one end of the transmission connecting rod (24); the other end of the transmission connecting rod (24) is hingedly connected to the driving end of the moving contact (9); a camshaft (25) is provided in the frame (2); a cam (26) is provided on the camshaft (25); the outer peripheral contour of the cam (26) is in contact with the half-shaft (22) and the connecting plate (23).

2. The environmental protection cabinet circuit breaker according to claim 1, characterized in that: The bottom of the arc extinguishing chamber (3) is fitted to the upper surface of the arc extinguishing chamber bracket (5) and fastened by bolts; a plurality of arc extinguishing grids (4) arranged in parallel with each other are provided inside the arc extinguishing chamber (3), and the two ends of the arc extinguishing grids (4) are respectively fixedly connected to the inner walls on both sides of the arc extinguishing chamber (3).

3. The environmental protection cabinet circuit breaker according to claim 2, characterized in that: A threaded hole is provided at the bottom of the circuit breaker housing (1), a grounding bolt (29) is provided in the threaded hole, and the head of the grounding bolt (29) is exposed from the bottom surface of the circuit breaker housing (1); a connecting boss is provided on the outer side of the cable connector (13), and a cable lightning protection connection terminal (30) is provided on the side.

4. The environmental protection cabinet circuit breaker according to claim 3, characterized in that: The frame (2) is further provided with a plurality of fixing frames, on which a tripper (7), an undervoltage tripper (15), and an electromagnetic lock (16) are provided; the output ends of the tripper (7), the undervoltage tripper (15), and the electromagnetic lock (16) are all connected to the half shaft (22) through a transmission member; an interlocking rod (28) is mounted on the frame (2) via a rotating shaft, and an isolation copper rod (31) is provided on the inner lower side of the frame (2).

5. The environmental protection cabinet circuit breaker according to claim 4, characterized in that: An insulating partition (6) is provided in the frame (2), and a supporting insulator (27) is inserted into the middle of the frame (2).

6. An operating method for an environmental protection cabinet circuit breaker according to claim 1, characterized in that: The following steps are involved: Step 1. Preparation for closing operation: Check whether the circuit breaker housing (1) is damaged, whether the grounding bolt (29) is firmly installed and the head is exposed from the bottom surface of the circuit breaker housing (1), so that the equipment is in a safe grounding state; check whether the connection port of the cable connector (13) and the terminal block (12) is well plugged in and out, and whether the connection boss on the outside of the cable connector (13) and the cable lightning protection connection end (30) are normal; check whether the trip unit (7), undervoltage trip (15), and electromagnetic lock (16) on the frame (2) are firmly installed, and whether the output end thereof is connected to the transmission part of the half shaft (22) normally; check whether the interlocking rod (28) and the isolation copper rod (31) are in the normal position; Step 2, starting the closing action: energize the opening and closing electromagnet (17), and the output shaft of the opening and closing electromagnet (17) drives the half shaft (22) to rotate through the coupling; when the half shaft (22) rotates, it drives the connecting plate (23) hinged thereto to move, and the connecting plate (23) then drives the transmission connecting rod (24) to move; the transmission connecting rod (24) pushes the moving contact (9) to make a linear motion relative to the contact seat (11), so that the contact (8) on the moving contact (9) contacts the contact (8) on the static contact (10), thereby closing the circuit breaker; Step 3, spring energy storage and cam coordination: During the closing process, the closing spring (18) is stretched to store energy, one end of which is fixed to the spring fixing seat on the frame (2), and the closing shaft (19) connected to the other end rotates on the frame (2) through the bearing. The outer peripheral contour of the cam (26) on the cam shaft (25) in the frame (2) contacts and cooperates with the half shaft (22) and the connecting plate (23), thereby assisting the stable closing action; Step 4, opening operation: triggering the opening command: when opening is required, the opening signal is triggered by the tripper (7), undervoltage trip (15) or electromagnetic lock (16); the output end drives the half shaft (22) to rotate through the transmission member; Step 5: Execution of the opening action: the half shaft (22) rotates to drive the connecting plate (23) and the transmission connecting rod (24) to move, and the transmission connecting rod (24) pulls the moving contact (9) to make a linear motion relative to the contact seat (11), so that the contact (8) on the moving contact (9) is separated from the contact (8) on the static contact (10), so that the circuit breaker is opened; Step 6: During the opening process, the opening spring (20) releases energy, one end of which is fixed on the spring fixing seat of the frame (2), and the opening shaft (21) connected to the other end rotates on the frame (2) through the bearing, thereby assisting in the rapid completion of the opening action.

7. The method for operating an environmental protection cabinet circuit breaker according to claim 6, characterized in that: The inspection and maintenance are also included: regularly opening the circuit breaker housing (1) to check whether the arc extinguishing grid (4) in the arc extinguishing chamber (3) is damaged or deformed, and whether the bolt connection between the bottom of the arc extinguishing chamber (3) and the arc extinguishing chamber bracket (5) is tight; regularly checking whether the interference fit between the contact seat (11) and the conductive rod (14) is tight, whether the bolt connection between the conductive rod (14) and the terminal block (12) is loose, and whether the plug-in connection between the terminal block (12) and the cable connector (13) is good.

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