Environment-friendly cabinet circuit breaker and operation method thereof

Abstract

According to the environment-friendly cabinet circuit breaker and the operation method thereof, the arc extinguish chamber is arranged in the circuit breaker shell, the arc extinguish chamber support and the multiple arc extinguish grid pieces arranged in parallel are arranged in the arc extinguish chamber, and the arc extinguish efficiency is effectively improved; the circuit breaker linkage mechanism is arranged on the front side of the arc extinguish chamber and comprises a contact seat, a moving contact and a static contact, and the moving contact can linearly move relative to the contact seat to realize on-off control of a circuit; the conducting rod and the wiring terminal strip are fastened and connected through interference fit and bolts, so that stable current transmission is ensured; the opening and closing mechanism is composed of an opening and closing electromagnet, a closing spring, an opening spring and a linkage part, and rapid and reliable opening and closing operation of the circuit breaker is achieved. In addition, multiple protection devices including a release, an under-voltage release and an electromagnetic lock catch are arranged, so that the system safety is improved; the arc extinguishing device is compact in structure, reliable in operation and good in arc extinguishing effect, has good environmental protection property, safety and intelligent control capability, and is suitable for application requirements on high-performance power distribution equipment in a modern electric power system.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection cabinets, and more particularly to an environmental protection cabinet circuit breaker and its operation method. Background Art

[0002] In the power system, the circuit breaker, as a key control and protection device, plays a crucial role in ensuring the safety and stability of power supply. With the enhancement of environmental awareness and the continuous improvement of equipment performance requirements in the power industry, traditional circuit breakers have some deficiencies in practical applications.

[0003] The arc extinguishing chamber structure of traditional circuit breakers is relatively simple, and the arc extinguishing ability is limited. In some arc extinguishing chambers, reasonable arc extinguishing grids are not provided inside, or the number of arc extinguishing grids is insufficient and the arrangement is unreasonable, resulting in the difficulty of quickly extinguishing the arc generated during the opening and closing processes. The long-term existence of the arc will not only cause serious ablation of the contacts, shorten the service life of the contacts, increase the maintenance cost of the equipment, but also may cause phase-to-phase short-circuit faults, affecting the safe operation of the power system. Moreover, due to untimely arc extinguishing, higher overvoltages will be generated, damaging the insulation performance of power equipment and reducing the reliability of the equipment. The opening and closing mechanisms of traditional circuit breakers usually adopt relatively complex mechanical transmission structures, with a large number of components, and the installation and debugging are difficult. During the long-term frequent opening and closing operations, these components are prone to wear and looseness problems, resulting in a decline in the accuracy and reliability of the opening and closing actions, posing a great hidden danger to the safety of the power system.

[0004] The connection methods between the contact seat and the conducting rod, between the conducting rod and the terminal block, and between the terminal block and the cable joint of traditional circuit breakers may not be reliable enough. Traditional circuit breakers lack effective grounding protection devices or the grounding methods are unreliable. When the equipment leaks electricity, the current cannot be introduced into the ground in time, which is likely to cause electric shock danger to the operators. At the same time, the circuit breaker does not have a special lightning protection connection terminal. When the line is struck by lightning, the lightning current may cause serious damage to the circuit breaker and related equipment, affecting the normal operation of the power system. Therefore, we propose an environmental protection cabinet circuit breaker and its operation method. Summary of the Invention

[0005] The purpose of the present invention is to address the problems raised in the existing background art. To achieve the above-mentioned invention purpose, the present invention provides the following technical solutions: An environmental protection cabinet circuit breaker includes a circuit breaker housing. A framework is arranged inside the circuit breaker housing. There is a gap between the outer periphery of the framework and the inner wall of the circuit breaker housing. An arc extinguishing chamber is arranged inside the circuit breaker housing. An arc extinguishing chamber support is arranged inside the arc extinguishing chamber. A circuit breaker linkage mechanism is arranged on the front side of the arc extinguishing chamber. 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 attached to the upper surface of the arc extinguishing chamber bracket and fastened by bolts; a plurality of arc extinguishing grid plates arranged in parallel with each other are provided inside the arc extinguishing chamber, and both ends of the arc extinguishing grid plates are fixedly connected to the inner walls on both sides of the arc extinguishing chamber respectively.

[0007] As a preferred technical solution of the present invention, the breaker linkage mechanism is provided with a contact seat, two mounting positions are provided on the contact seat, a moving contact and a static contact are respectively mounted, contacts are provided on the moving contact and the static contact, the moving contact moves linearly relative to the contact seat, the static contact is fixedly connected to the contact seat, and the moving contact and the static contact are in the same plane.

[0008] As a preferred technical solution of the present invention, a connection hole is opened on the lower side of the contact seat, a conductive rod is arranged in the connection hole and tightly connected by interference fit; the other end of the conductive rod passes through the through hole on the frame and is connected to the terminal block, the terminal block is installed on the outer side wall of the breaker housing, the terminal block and the conductive rod are fastened by bolts; connection ports are provided on the terminal block, and the connection ports are plugged and unplugged with the cable connectors.

[0009] As a preferred technical solution of the present invention, the breaker closing and opening mechanism is provided with a closing and opening electromagnet, a closing spring, a tripping spring and a tripping rotating shaft. The closing and opening electromagnet is installed on the mounting seat of the frame. One end of the closing spring is fixed on the spring fixing seat on the frame, and the other end is connected to one end of the closing rotating shaft. The other end of the closing rotating shaft is installed on the frame through a bearing; one end of the tripping spring is fixed on another spring fixing seat on the frame, and the other end is connected to one end of the tripping rotating shaft. The other end of the tripping rotating shaft is also installed on the frame through a bearing; a half shaft is arranged on the side of the tripping rotating shaft, and the output shaft of the closing and opening electromagnet is connected to one end of the half shaft through a coupling; one end of the half shaft is hinged to one end of a connecting plate, the other end of the connecting plate is hinged to one end of a 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 arranged inside the frame, a cam is arranged on the camshaft, and the outer peripheral contour of the cam is in contact and cooperation with the half shaft and the connecting plate.

[0010] As a preferred technical solution of the present invention, threaded holes are opened at the bottom of the breaker housing, grounding bolts are arranged in the threaded holes, and the heads of the grounding bolts expose the bottom surface of the breaker housing; a connecting boss is arranged on the outer side of the cable connector, and a cable lightning protection connection end is arranged on the side thereof.

[0011] As a preferred technical solution of the present invention, a plurality of fixing brackets are further provided on the frame, and a release, an under-voltage release, and an electromagnetic lock are provided on the fixing brackets; the output ends of the release, the under-voltage release, and the electromagnetic lock are all connected to the half shaft through transmission members; an interlocking rod is installed on the frame through a rotating shaft, and an isolating copper bar is provided on the lower side inside the frame.

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

[0013] An operation method of an environmental protection cabinet circuit breaker includes the following steps: Step 1, Preparation for closing operation: Check whether the outer shell of the circuit breaker is damaged, whether the grounding bolt is firmly installed and the head exposes the bottom surface of the circuit breaker outer shell, so that the equipment is in a safe grounding state; Check whether the connection ports of the cable joints and the terminal blocks are plugged and unplugged well, and whether the connection bosses outside the cable joints and the cable lightning protection connection ends are normal; Check whether the release, under-voltage release, and electromagnetic lock components on the frame are firmly installed, and whether the connection of their output ends to the transmission members of the half shaft is normal; Check whether the interlocking rod and the isolating copper bar are in normal positions; Step 2, Start the closing action: Energize the closing and opening electromagnets, and the output shaft of the closing and opening electromagnets drives the half shaft to rotate through a coupling; When the half shaft rotates, it drives the connecting plate hinged thereto to move, and the connecting plate then drives the transmission connecting rod to move; The transmission connecting rod pushes the moving contact to move linearly relative to the contact seat, so that the contacts on the moving contact contact the contacts on the static contact, realizing the closing of the circuit breaker; Step 3, Spring energy storage and cam cooperation: During the closing process, the closing spring is stretched and energized, one end of which is fixed on the spring fixing seat on the frame, and the other end is connected to the closing rotating shaft and rotates on the frame through a bearing. The outer peripheral contour of the cam on the camshaft in the frame contacts and cooperates with the half shaft and the connecting plate to assist the stable progress of the closing action; Step 4, Opening operation: Trigger the opening command: When opening is required, trigger the opening signal through the release, under-voltage release or electromagnetic lock; The output ends of these components drive the half shaft to rotate through transmission members; Step 5, Execution of the opening action: The rotation of the half shaft drives the connecting plate and the transmission connecting rod to move, and the transmission connecting rod pulls the moving contact to move linearly relative to the contact seat, so that the contacts on the moving contact are separated from the contacts on the static contact, realizing the opening of the circuit breaker; Step 6, During the opening process, the opening spring releases energy, one end of which is fixed on the spring fixing seat of the frame, and the other end is connected to the opening rotating shaft and rotates on the frame through a bearing to assist the rapid completion of the opening action.

[0014] As a preferred technical solution of the present invention, it further includes inspection and maintenance: regularly open the breaker housing to check whether the arc extinguishing grids in the arc extinguishing chamber are damaged or deformed, and whether the bolt connection between the bottom of the arc extinguishing chamber and the arc extinguishing chamber bracket is tightened; regularly check whether the interference fit between the contact seat and the conducting rod is tight, whether the bolt connection between the conducting rod and the terminal block is loose, and whether the plug-in connection between the terminal block and the cable joint is good; check whether the insulating partition and the support insulator in the frame have cracks, damage, or poor insulation.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: A gap is provided between the outer periphery of the frame inside the breaker housing and the inner wall of the housing. This design not only provides sufficient space for the installation and maintenance of internal components, facilitates the maintenance operation of the staff, and reduces the maintenance difficulty and cost. The gap can also play a certain buffering role, reducing the impact of external vibration and shock on the frame and internal components, and improving the stability and reliability of the equipment.

[0016] The bottom of the arc extinguishing chamber fits with the upper surface of the arc extinguishing chamber bracket and is fastened by bolts, ensuring the stability of the arc extinguishing chamber installation. Under the vibration and arc shock generated by the frequent opening and closing of the breaker, the arc extinguishing chamber can still maintain a good position and state, ensuring the normal operation of the arc extinguishing function and extending the service life of the arc extinguishing chamber.

[0017] Multiple mutually parallel arc extinguishing grids are arranged in the arc extinguishing chamber. When the breaker opens and an arc is generated, after the arc enters the arc extinguishing chamber, it will be divided into multiple short arcs by the arc extinguishing grids. The voltage drop of the short arcs increases, and at the same time, the arc extinguishing grids absorb the heat of the arc, quickly cooling the arc, thereby accelerating the arc extinguishing speed, effectively preventing the arc from damaging the contacts and other components, and improving the opening and closing performance and service life of the breaker.

[0018] The moving contact in the breaker linkage mechanism moves linearly relative to the contact seat. The static contact is fixedly connected to the contact seat and they are in the same plane. This design makes the movement trajectory of the moving contact simple and clear, easy to control, and can accurately contact and separate from the static contact, ensuring the reliable conduction and cutting-off of the circuit. The contact seat and the conducting rod are tightly connected by interference fit, the conducting rod and the terminal block are fastened by bolts, and the terminal block and the cable joint are connected by plug-in. This multi-level reliable connection method ensures the stability and safety of current transmission, reduces the contact resistance, and reduces the energy loss.

[0019] The breaker opening and closing mechanism adopts a cooperation of an opening and closing electromagnet, a closing spring, a tripping spring, and a tripping rotating shaft component. The opening and closing electromagnet can quickly respond to the control signal, accurately drive the half shaft to rotate, and then drive the moving contact to move through the connecting plate and the transmission connecting rod to achieve the opening and closing operation.

[0020] The closing spring and the opening spring play the roles of energy storage and energy release respectively during the closing and opening processes, assisting in the rapid and stable completion of the closing and opening operations. The cam on the camshaft contacts and cooperates with the half shaft and the connecting plate, further improving the accuracy and reliability of the closing and opening operations.

[0021] A grounding bolt is provided at the bottom of the circuit breaker housing, and the head thereof protrudes from the bottom surface, reliably grounding the circuit breaker housing. When a leakage fault occurs in the equipment, the grounding bolt can introduce the current into the ground, effectively avoiding the occurrence of electric shock accidents and ensuring the safety of personnel and equipment.

[0022] A cable lightning protection connection terminal is provided on the side of the cable joint. 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 under harsh weather conditions.

[0023] The release, under-voltage release, and electromagnetic locking protection devices provided on the frame can monitor the current and voltage parameters in the circuit in real time. When abnormal conditions such as overload, short circuit, and under-voltage are detected, the output ends of these protection devices drive the half shaft to rotate through the transmission member, causing the circuit breaker to quickly open and cut off the circuit, protecting the equipment and the line from damage. The interlocking rod and the isolating copper bar realize the interlocking function between the circuit breaker and other equipment, preventing misoperation and improving the safety of the equipment. Description of the Drawings: Figure 1 It is a schematic structural diagram provided by the present invention; Figure 2 It is a schematic internal structure diagram provided by the present invention; Figure 3 It is a schematic structural diagram of the cable lightning protection connection terminal provided by the present invention; Figure 4 It is a schematic structural diagram of the cable joint provided by the present invention; Figure 5 It is a schematic structural diagram of the contact provided by the present invention; Figure 6 It is a schematic structural diagram of the cam provided by the present invention; Figure 7 It is a schematic structural diagram of the closing and opening springs provided by the present invention; Figure 8 It is a schematic structural diagram of the interlocking rod provided by the present invention; Figure 9 It is a schematic structural diagram of the under-voltage release provided by the present invention.

[0025] Labels in the figures: 1. Circuit breaker housing; 2. Frame; 3. Arc extinguishing chamber; 4. Arc extinguishing grid; 5. Arc extinguishing chamber support; 6. Insulating partition; 7. Release; 8. Contact; 9. Moving contact; 10. Stationary contact; 11. Contact seat; 12. Terminal block; 13. Cable joint; 14. Conductive rod; 15. Under-voltage release; 16. Electromagnetic latch; 17. Closing and opening electromagnet; 18. Closing spring; 19. Closing rotating shaft; 20. Opening spring; 21. Opening rotating shaft; 22. Half shaft; 23. Link plate; 24. Transmission link; 25. Camshaft; 26. Cam; 27. Support insulator; 28. Interlocking rod; 29. Earthing bolt; 30. Cable lightning protection connection end; 31. Isolation copper bar. Detailed implementation mode

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, 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 embodiments are specific implementation manners of the present invention and are not limited to all embodiments.

[0027] 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 obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0028] It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments may be combined with each other. It should be noted that similar reference numerals and letters denote 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.

[0029] Embodiment 1: An environmental protection cabinet circuit breaker includes a circuit breaker housing 1. A frame 2 is arranged 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 arranged inside the circuit breaker housing 1. An arc extinguishing chamber support 5 is arranged inside the arc extinguishing chamber 3. A circuit breaker linkage mechanism is arranged on the front side of the arc extinguishing chamber 3, and the circuit breaker linkage mechanism cooperates with the circuit breaker closing and opening mechanism.

[0030] 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; multiple arc extinguishing grid plates 4 arranged parallel to each other are provided inside the arc extinguishing chamber 3, and both ends of the arc extinguishing grid plates 4 are fixedly connected to the inner walls on both sides of the arc extinguishing chamber 3. The breaker linkage mechanism is provided with a contact seat 11, and two mounting positions are provided on the contact seat 11, on which a moving contact 9 and a static contact 10 are respectively mounted. Contacts 8 are provided on the moving contact 9 and the static contact 10. The moving contact 9 moves linearly 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 on the same plane.

[0031] A connection hole is provided on the lower side of the contact seat 11, a conducting rod 14 is arranged in the connection hole and tightly connected by interference fit; the other end of the conducting rod 14 passes through a through hole on the frame 2 and is connected to the terminal block 12, the terminal block 12 is installed on the outer side wall of the breaker housing 1, and the terminal block 12 and the conducting rod 14 are fastened by bolts; connection ports are provided on the terminal block 12, and the connection ports are connected to the cable connector 13 by plugging and unplugging.

[0032] The breaker opening and closing mechanism is provided with an opening and closing electromagnet 17, a closing spring 18, a tripping spring 20 and a tripping rotating shaft 21. The opening and closing electromagnet 17 is installed on the mounting seat of the frame 2. One end of the closing spring 18 is fixed on the spring fixing seat of 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 installed on the frame 2 through a bearing; one end of the tripping spring 20 is fixed on another spring fixing seat of the frame 2, and the other end is connected to one end of the tripping rotating shaft 21. The other end of the tripping rotating shaft 21 is also installed on the frame 2 through a bearing; a half shaft 22 is arranged on the side of the tripping rotating 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 hinged to one end of a connecting plate 23, the other end of the connecting plate 23 is hinged to one end of a transmission connecting rod 24, and the other end of the transmission connecting rod 24 is hinged to the driving end of the moving contact 9; a camshaft 25 is arranged inside the frame 2, a cam 26 is arranged on the camshaft 25, and the outer peripheral contour of the cam 26 is in contact and cooperation with the half shaft 22 and the connecting plate 23.

[0033] Threaded holes are provided at the bottom of the breaker housing 1, and earthing bolts 29 are arranged in the threaded holes. The heads of the earthing bolts 29 expose the bottom surface of the breaker housing 1; a connecting boss is provided on the outer side of the cable connector 13, and a cable lightning protection connection end 30 is provided on the side.

[0034] There are also multiple fixing brackets provided on the frame 2, and a release 7, an under-voltage release 15, and an electromagnetic lock 16 are provided on the fixing brackets; the output ends of the release 7, the under-voltage release 15, and the electromagnetic lock 16 are all connected to the half shaft 22 through transmission components; an interlocking rod 28 is installed on the frame 2 through a rotating shaft, and an isolating copper bar 31 is arranged on the lower side inside the frame 2. An insulating partition 6 is arranged inside the frame 2, and a support insulator 27 is inserted in the middle of the frame 2.

[0035] Working principle of the environmental protection cabinet circuit breaker: Closing and opening operation principle: When a closing operation is required, the closing and opening electromagnet 17 is energized. The output shaft of the closing and opening electromagnet 17 starts to rotate, drives the half shaft 22 to rotate through a coupling. The rotation of the half shaft 22 causes the connecting plate 23 hinged to it to move, and the connecting plate 23 further drives the transmission connecting rod 24 to move. The transmission connecting rod 24 pushes the moving contact 9 to move linearly relative to the contact seat 11 until the contact 8 on the moving contact 9 contacts the contact 8 on the static contact 10, thereby realizing the closing of the circuit breaker.

[0036] During the closing process, the closing spring 18 is stretched and stores energy. One end of the closing spring 18 is fixed on the spring fixing seat on the frame 2, and the other end is connected to the closing rotating shaft 19. The closing rotating shaft 19 is installed on the frame 2 through a bearing. At the same time, the cam 26 on the camshaft 25 inside the frame 2, whose outer peripheral contour is in contact and cooperation with the half shaft 22 and the connecting plate 23, assists the movement of the half shaft 22 and the connecting plate 23 to ensure the stable progress of the closing action.

[0037] Opening process: The opening operation can be triggered in various ways. When the release 7, the under-voltage release 15, or the electromagnetic lock 16 detects an abnormal situation, their output ends drive the half shaft 22 to rotate through transmission components. It is also possible to directly apply a reverse current or a control signal to the closing and opening electromagnet 17 to make the output shaft of the closing and opening electromagnet 17 rotate in the reverse 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 move linearly relative to the contact seat 11, separating the contact 8 on the moving contact 9 from the contact 8 on the static contact 10, realizing the opening of the circuit breaker. During the opening process, the opening spring 20 releases energy. One end of the opening spring 20 is fixed on the spring fixing seat of the frame 2, and the other end is connected to the opening rotating shaft 21. The opening rotating shaft 21 is installed on the frame 2 through a bearing to assist the rapid completion of the opening action.

[0038] Circuit connection principle: The cable joint 13 is pluggably connected to the connection port on the terminal block 12, and the terminal block 12 is installed on the outer side wall of the circuit breaker housing 1. The terminal block 12 and the conductive rod 14 are fastened by bolts. The other end of the conductive rod 14 passes through the through hole on the frame 2 and is tightly connected with the conductive rod 14 in the connection hole on the lower side of the contact seat 11 by interference fit. When the circuit breaker is closed, current flows in from the cable joint 13, passes through the terminal block 12, the conductive rod 14, the contact seat 11, and then forms a closed circuit through the moving contact 9 and the static contact 10 to achieve power transmission.

[0039] Arc extinguishing principle: When the circuit breaker is tripped, an arc is generated when the moving contact 9 and the static contact 10 are separated. The arc enters the arc extinguishing chamber 3, and a plurality of arc extinguishing grid plates 4 arranged parallel to each other are provided in the arc extinguishing chamber 3. Under the action of the arc extinguishing grid plates 4, the arc is divided into multiple short arcs. The voltage drop of the short arcs increases, and at the same time, the arc extinguishing grid plates 4 absorb the heat of the arc, so that the arc is quickly cooled, thereby accelerating the extinction of the arc and effectively preventing the arc from damaging the equipment.

[0040] The grounding bolt 29 at the bottom of the circuit breaker housing 1, whose head exposes the bottom surface of the housing, reliably grounds the circuit breaker housing 1 to prevent personal and equipment hazards caused by equipment leakage. The cable lightning protection connection end 30 on the side of the cable joint 13 is used to connect the lightning protection device. When the line is struck by lightning, the lightning current is introduced into the ground to protect the equipment safety.

[0041] The release 7, undervoltage release 15, and electromagnetic latch 16: As protection 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 trip the circuit breaker, playing a role in protecting the circuit and equipment.

[0042] The interlocking rod 28 and the isolating copper bar 31 are used to realize the interlocking function between the circuit breaker and other equipment, ensuring the safety and correctness of the operation. The insulating partition 6 and the support insulator 27 inserted in the middle in the frame 2 play the roles of electrical insulation and support, ensuring electrical isolation between components and preventing short circuit faults.

[0043] Embodiment 2: An operating method for an environmental protection cabinet circuit breaker includes the following steps: Step 1. Preparation for closing operation: Check whether the circuit breaker housing 1 is damaged, whether the grounding bolt 29 is firmly installed and its head exposes the bottom surface of the circuit breaker housing 1 so that the equipment is in a safe grounding state; check whether the connection port between the cable joint 13 and the terminal block 12 is pluggably connected well, and whether the connection boss on the outside of the cable joint 13 and the cable lightning protection connection end 30 are normal; check whether the release 7, undervoltage release 15, and electromagnetic latch 16 components on the frame 2 are firmly installed and whether their output ends are normally connected to the transmission member of the half shaft 22; check whether the interlocking rod 28 and the isolating copper bar 31 are in normal positions; Step 2. Initiate the closing operation: Energize the closing and opening electromagnet 17. The output shaft of the closing and opening electromagnet 17 drives the half shaft 22 to rotate through a 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 link 24 to move; the transmission link 24 pushes the moving contact 9 to move linearly relative to the contact holder 11, so that the contact 8 on the moving contact 9 contacts the contact 8 on the static contact 10, realizing the closing of the circuit breaker; Step 3. Spring energy storage and cam cooperation: During the closing process, the closing spring 18 is stretched and stores energy. One end of it is fixed on the spring fixing seat on the frame 2, and the other end is connected to the closing rotating shaft 19 which rotates on the frame 2 through a bearing. The outer peripheral 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 to assist the stable progress of the closing operation; Step 4. Opening operation: Trigger the opening command: When opening is required, trigger the opening signal through the release 7, under-voltage release 15 or electromagnetic latch 16; the output ends of these components drive the half shaft 22 to rotate through transmission components; Step 5. Execute the opening action: The rotation of the half shaft 22 drives the connecting plate 23 and the transmission link 24 to move. The transmission link 24 pulls the moving contact 9 to move linearly relative to the contact holder 11, so that the contact 8 on the moving contact 9 separates from the contact 8 on the static contact 10, realizing the opening of the circuit breaker; Step 6. During the opening process, the opening spring 20 releases energy. One end of it is fixed on the spring fixing seat of the frame 2, and the other end is connected to the opening rotating shaft 21 which rotates on the frame 2 through a bearing, assisting the rapid completion of the opening operation.

[0044] Inspection and maintenance: Regularly open the circuit breaker housing 1 to check whether the arc extinguishing grid pieces 4 in the arc extinguishing chamber 3 are damaged or deformed, and whether the bolt connection between the bottom of the arc extinguishing chamber 3 and the arc extinguishing chamber support 5 is tightened; regularly check whether the interference fit between the contact holder 11 and the conducting rod 14 is tight, whether the bolt connection between the conducting rod 14 and the terminal block 12 is loose, and whether the plug-in connection between the terminal block 12 and the cable joint 13 is good; check whether the insulating partition 6 and the support insulator 27 in the frame 2 have cracks, damage and poor insulation conditions.

[0045] Working process of the environmental protection cabinet circuit breaker: Closing working process: Trigger the closing command: When the circuit breaker needs to be closed, the operator sends an energizing signal to the closing and opening electromagnet 17. The closing and opening electromagnet 17 is installed on the mounting seat of the frame 2, and its output shaft starts to rotate after being energized.

[0046] Transmission mechanism action: The output shaft of the closing and opening electromagnet 17 drives the half shaft 22 to rotate through a coupling. One end of the half shaft 22 is hinged to the connecting plate 23, and when the half shaft 22 rotates, it drives the connecting plate 23 to move. The other end of the connecting plate 23 is hinged to one end of the transmission link 24, and the movement of the connecting plate 23 drives the transmission link 24 to move.

[0047] Moving contact moves: The other end of the transmission connecting rod 24 is hinged to the driving end of the moving contact 9. The movement of the transmission connecting rod 24 pushes the moving contact 9 to perform a linear motion relative to the contact holder 11. The moving contact 9 and the static contact 10 are respectively installed on the contact holder 11. The moving contact 9 and the static contact 10 are in the same plane, and both are provided with contacts 8. As the moving contact 9 moves, the contact 8 on the moving contact 9 gradually approaches and finally contacts the contact 8 on the static contact 10, thereby realizing the conduction of the circuit and completing the closing operation.

[0048] Spring energy storage and cam cooperation: During the closing process, the closing spring 18 is stretched and stored with energy. One end of the closing spring 18 is fixed on the 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 installed on the frame 2 through a bearing. At the same time, the cam 26 on the camshaft 25 arranged in the frame 2 has an outer peripheral contour that contacts and cooperates with the half shaft 22 and the connecting plate 23, assisting the movement of the half shaft 22 and the connecting plate 23 to ensure the stability and reliability of the closing action.

[0049] Circuit connection: After the closing is completed, the current flows in from the cable joint 13. The cable joint 13 is pluggably connected to the connection port on the terminal block 12. The terminal block 12 is installed on the outer side wall of the circuit breaker housing 1 and is fastened to the conducting rod 14 by bolts. One end of the conducting rod 14 is tightly connected to the connection hole on the lower side of the contact holder 11 through interference fit, and the other end passes through the through hole on the frame 2 and is connected to the terminal block 12. The current sequentially passes through the cable joint 13, the terminal block 12, the conducting rod 14, the contact holder 11, the moving contact 9 and the static contact 10 to form a closed circuit, realizing the transmission of electric power.

[0050] Opening operation process: Opening instruction trigger: The opening operation can be triggered by various situations. When the release 7 detects an overload or short - circuit fault in the circuit, the under - voltage release 15 detects insufficient voltage, or the electromagnetic latch 16 receives a specific control signal, their output ends drive the half shaft 22 to rotate through transmission parts. In addition, a reverse current or control signal can also be directly applied to the closing and opening electromagnet 17, so that the output shaft of the closing and opening electromagnet 17 rotates in the reverse direction, and then drives the half shaft 22 to rotate.

[0051] Reverse action of the transmission mechanism: The rotation of the half shaft 22 drives the connecting plate 23 to move, and the connecting plate 23 then drives the transmission connecting rod 24 to move. At this time, the transmission connecting rod 24 pulls the moving contact 9 to perform a reverse linear motion relative to the contact holder 11. Moving contact separation: As the moving contact 9 moves, the contact 8 on the moving contact 9 separates from the contact 8 on the static contact 10, and the circuit is cut off, completing the opening operation.

[0052] Spring energy release: During the opening process, the opening spring 20 releases energy. One end of the opening spring 20 is fixed on another spring fixing seat of 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 installed on the frame 2 through a bearing. The energy release of the opening spring 20 assists in quickly completing the opening action.

[0053] Arc extinguishing process: An arc is generated instantly when the moving contact 9 and the static contact 10 separate. The arc enters the arc extinguishing chamber 3, and multiple arc extinguishing grid plates 4 arranged parallel to each other are provided inside the arc extinguishing chamber 3. Both ends of the arc extinguishing grid plates 4 are fixedly connected to the inner walls on both sides of the arc extinguishing chamber 3. Under the action of the arc extinguishing grid plates 4, the arc is divided into multiple short arcs, the voltage drop of the short arcs increases, and at the same time, the arc extinguishing grid plates 4 absorb the heat of the arc, quickly cooling the arc, thereby accelerating the extinguishing of the arc and preventing the arc from damaging the equipment.

[0054] Grounding protection: The grounding bolt 29 provided in the threaded hole at the bottom of the circuit breaker housing 1 has its head exposed on the bottom surface of the circuit breaker housing 1, reliably grounding the circuit breaker housing 1 and preventing harm to personnel and equipment due to leakage during the operation of the equipment.

[0055] Lightning protection: A connecting boss is provided on the outside of the cable joint 13, and a cable lightning protection connection end 30 is provided on the side. When the line is struck by lightning, the cable lightning protection connection end 30 introduces the lightning current into the ground to protect the circuit breaker and related equipment from lightning damage.

[0056] Interlocking and isolation: The interlocking rod 28 installed on the frame 2 through a rotating shaft and the isolation copper bar 31 provided on the lower side inside are used to realize the interlocking function between the circuit breaker and other equipment, ensuring the safety and correctness of the operation and preventing misoperation. Insulation support: The insulating partition 6 provided inside the frame 2 and the support insulator 27 inserted in the middle play the roles of electrical insulation and support, ensuring electrical isolation between components, preventing short-circuit faults, and ensuring the stability and reliability of the operation of the circuit breaker.

[0057] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above various embodiments, the present invention is not limited to the above specific embodiments. Therefore, any modification or substitution of the present invention; and all technical solutions and their improvements that do not deviate from the spirit and scope of the invention are covered by the scope of the claims of the present invention.

Claims

1. An environmentally friendly cabinet circuit breaker, comprising a circuit breaker housing (1), wherein a frame (2) is arranged 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), and it is characterized in that, An arc extinguishing chamber (3) is provided inside the circuit breaker housing (1). An arc extinguishing chamber support (5) is provided inside the arc extinguishing chamber (3). 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.

2. The environmentally friendly cabinet circuit breaker according to claim 1, wherein The bottom of the arc extinguishing chamber (3) is in contact with the upper surface of the arc extinguishing chamber support (5) and is fastened by bolts; a plurality of mutually parallel arc extinguishing grids (4) are provided inside the arc extinguishing chamber (3), and both ends of the arc extinguishing grids (4) are 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 The circuit breaker linkage mechanism is provided with a contact seat (11). Two mounting positions are provided on the contact seat (11), on which a moving contact (9) and a static contact (10) are respectively mounted. Contacts (8) are provided on the moving contact (9) and the static contact (10). The moving contact (9) moves linearly 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 in the same plane.

4. The environmentally friendly cabinet circuit breaker according to claim 3, characterized in that, A connection hole is provided on the lower side of the contact seat (11). A conducting rod (14) is provided in the connection hole and is tightly connected by interference fit; the other end of the conducting rod (14) passes through a through hole on the frame (2) and is connected to a terminal block (12). The terminal block (12) is mounted on the outer side wall of the circuit breaker housing (1). The terminal block (12) and the conducting rod (14) are fastened by bolts; connection ports are provided on the terminal block (12), and the connection ports are pluggably connected to cable connectors (13).

5. The environmental protection cabinet circuit breaker according to claim 4, characterized in that, The circuit breaker opening and closing mechanism is provided with a closing and opening electromagnet (17), a closing spring (18), a tripping spring (20), and a tripping rotating shaft (21). The closing and opening 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 a 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 tripping spring (20) is fixed on another spring fixing seat on the frame (2), and the other end is connected to one end of the tripping rotating shaft (21). The other end of the tripping rotating shaft (21) is also mounted on the frame (2) through a bearing; a half shaft (22) is provided on the side of the tripping rotating shaft (21). The output shaft of the closing and opening 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 a connecting plate (23). The other end of the connecting plate (23) is hingedly connected to one end of a transmission link (24). The other end of the transmission link (24) is hingedly connected to the driving end of the moving contact (9); a camshaft (25) is provided inside the frame (2). A cam (26) is provided on the camshaft (25). The outer peripheral contour of the cam (26) is in contact and cooperation with the half shaft (22) and the connecting plate (23).

6. The environmental protection cabinet circuit breaker according to claim 5, wherein The bottom of the circuit breaker housing (1) is provided with threaded holes, and a grounding bolt (29) is arranged in the threaded holes. The head of the grounding bolt (29) exposes the bottom surface of the circuit breaker housing (1); a connecting boss is arranged on the outer side of the cable joint (13), and a cable lightning protection connection end (30) is arranged on the side.

7. The environmental protection cabinet circuit breaker according to claim 6, characterized in that, A plurality of fixing brackets are further arranged on the frame (2), and a release (7), an under-voltage release (15), and an electromagnetic lock (16) are arranged on the fixing brackets; the output ends of the release (7), the under-voltage release (15), and the electromagnetic lock (16) are all connected to the half shaft (22) through transmission parts; an interlocking rod (28) is installed on the frame (2) through a rotating shaft, and an isolating copper bar (31) is arranged on the lower side inside the frame (2).

8. The environmentally friendly cabinet circuit breaker according to claim 7, wherein An insulating partition board (6) is arranged inside the frame (2), and a support insulator (27) is inserted in the middle of the frame (2).

9. An operating method for an environmentally friendly cabinet circuit breaker, characterized in that, It includes the following steps: Step 1, Preparation for closing operation: Check whether the circuit breaker housing (1) is damaged, whether the grounding bolt (29) is firmly installed and its head exposes the bottom surface of the circuit breaker housing (1) so that the equipment is in a safe grounding state; check whether the connection port between the cable joint (13) and the terminal block (12) is inserted and unplugged well, and whether the connecting boss and the cable lightning protection connection end (30) on the outer side of the cable joint (13) are normal; check whether the release (7), the under-voltage release (15), and the electromagnetic lock (16) components on the frame (2) are firmly installed and whether the transmission parts connecting their output ends to the half shaft (22) are normal; check whether the interlocking rod (28) and the isolating copper bar (31) are in normal positions; Step 2, Start the closing action: Energize the closing and opening electromagnet (17), and the output shaft of the closing and opening electromagnet (17) drives the half shaft (22) to rotate through a coupling; when the half shaft (22) rotates, it drives the connecting plate (23) hinged to it 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 move linearly 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), realizing the closing of the circuit breaker; Step 3, Spring energy storage and cam cooperation: During the closing process, the closing spring (18) is stretched and stored with energy. One end of it is fixed on the spring fixing seat on the frame (2), and the closing rotating shaft (19) connected to the other end rotates on the frame (2) through a bearing. The outer contour of the cam (26) on the camshaft (25) inside the frame (2) contacts and cooperates with the half shaft (22) and the connecting plate (23) to assist the stable progress of the closing action; Step 4, Opening operation: Trigger the opening instruction: When opening is required, trigger the opening signal through the release (7), the under-voltage release (15), or the electromagnetic lock (16); the output end drives the half shaft (22) to rotate through the transmission part; Step Five: Execution of the opening operation: 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 move linearly relative to the contact holder (11), separating the contact (8) on the moving contact (9) from the contact (8) on the static contact (10), causing the circuit breaker to open. Step Six: During the opening process, the opening spring (20) releases energy. One end of it is fixed on the spring fixing seat of the frame (2), and the other end is connected to the opening rotating shaft (21) which rotates on the frame (2) through a bearing, assisting in the rapid completion of the opening operation.

10. The operating method of an environmentally friendly cabinet circuit breaker according to claim 9, characterized in that, It also includes inspection and maintenance: Regularly open the circuit breaker housing (1) to check whether the arc extinguishing grid pieces (4) in the arc extinguishing chamber (3) are damaged or deformed, and whether the bolt connection between the bottom of the arc extinguishing chamber (3) and the arc extinguishing chamber support (5) is tightened; Regularly check whether the interference fit between the contact holder (11) and the conducting rod (14) is tight, whether the bolt connection between the conducting rod (14) and the terminal block (12) is loose, and whether the plug-in connection between the terminal block (12) and the cable joint (13) is good.

Images