CN118098899A - Circuit breaker contact structure convenient to assembly - Google Patents
Circuit breaker contact structure convenient to assembly Download PDFInfo
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- CN118098899A CN118098899A CN202410516299.XA CN202410516299A CN118098899A CN 118098899 A CN118098899 A CN 118098899A CN 202410516299 A CN202410516299 A CN 202410516299A CN 118098899 A CN118098899 A CN 118098899A
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention provides a circuit breaker contact structure convenient to assemble, and belongs to the technical field of circuit breakers. The invention comprises a static contact mounting plate and a moving contact mounting plate, wherein a base conducting plate and a static contact piece are connected above the static contact mounting plate through bolts, the bottom wall of the static contact piece is propped against the top end of the base conducting plate, an operation connecting rod is connected with the upper side wall of the moving contact mounting plate, the conducting plate is arranged at the lower end of the moving contact mounting plate, and the invention further comprises: the magnetic arc suppression assembly, the induction current interruption assembly and the pneumatic arc extinction assembly; through the extension and contraction of the magnetic column and the upward movement and downward pressing of the heat conducting rod, SF 6 gas is directly blown to a contact point generating an electric arc through a gas outlet groove and a nozzle which are specially designed and in different postures and gas paths when the gas outlet groove is opened and closed; when the temperature of the device exceeds a safety threshold or the electric arc is abnormal, the current is cut off through the cooperation of the heat conducting rod and the electric telescopic rod, and meanwhile, the arc extinguishing operation of SF 6 gas is triggered, so that double-layer protection is provided for the device to avoid damage.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a circuit breaker contact structure convenient to assemble.
Background
A circuit breaker is a device for protecting electrical lines and equipment from overload and short circuits. It is usually composed of a switching mechanism and an electromagnetic releaser, which can automatically interrupt the circuit when the current is overloaded or fails, so as to prevent dangerous events such as damage to equipment, fire and the like. Circuit breaker contacts are an important component in circuit breakers for making electrical connection or breaking a circuit when the circuit breaker trips. The circuit breaker contacts are generally composed of two parts, a moving contact and a fixed contact, which are one of the core components in the circuit breaker. The moving contact can move, and the fixed contact is kept fixed. When the circuit breaker works, the moving contact can be contacted with or separated from the fixed contact, so that the on-off of the circuit is controlled.
The existing breaker contacts have the following defects in use: firstly, when a moving contact and a fixed contact are closed or opened, an arc can be generated at the contact position, the arc can generate high temperature, which can lead to the melting, evaporation or damage of the contact surface, at present, most circuit breakers are provided with an arc extinguishing chamber above a shell to perform arc extinguishing treatment, so that the convenience of disassembly, assembly and maintenance of the contacts is reduced, meanwhile, the arc generated under different conditions cannot be processed pertinently, the processing capacity of the circuit breakers for the arcs at different positions and different intensities is limited, particularly, when the moving contact and the fixed contact are opened, the arc can spread in a plurality of directions, and the arc extinguishing chamber at a fixed position can not completely cover and effectively extinguish all the arcs; secondly, since the contact surface of the butt contact is changed along with the pressure change, a bouncing phenomenon may occur when the butt contact is turned on or off, which may affect the contact reliability between the contacts, thereby affecting the stability of the whole circuit.
How to develop a circuit breaker contact structure which is convenient to assemble to improve the problems becomes a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In order to remedy the above-mentioned drawbacks, the present invention provides a circuit breaker contact structure that is easy to assemble, aiming at improving the problems mentioned in the background above.
The invention is realized in the following way:
The invention provides a circuit breaker contact structure convenient to assemble, which comprises a fixed contact mounting plate and a moving contact mounting plate, wherein a base conducting plate and a fixed contact are mounted and connected above the fixed contact mounting plate through bolts, the bottom wall of the fixed contact is propped against the top end of the base conducting plate, the upper side wall of the moving contact mounting plate is mounted and connected with an operation connecting rod, the lower end of the moving contact mounting plate is provided with a conducting plate, a limit clamping seat is mounted and connected above the conducting plate, the left side wall and the right side wall of the moving contact mounting plate are both mounted and connected with a mounting clamping plate, the side wall of the mounting clamping plate is fixedly connected with a limit pin shaft, and the moving contact mounting plate is rotationally connected above the limit clamping seat through the limit pin shaft, and the circuit breaker contact structure further comprises:
Magnetic arc suppression assembly: the magnetic arc suppression assembly is arranged in the movable contact mounting plate and is used for reducing the generation of electric arcs at the contacts of the device;
Inductive current interruption assembly: the induction current interruption component is arranged on one side of the magnetic arc suppression component, and can automatically power off the device when a contact generates a large arc;
The pneumatic arc extinguishing assembly is arranged on one side of the magnetic arc suppressing assembly, and can perform self-adaptive arc extinguishing treatment on an arc generated when a contact is contacted or disconnected.
Preferably, the inside of moving contact mounting panel is provided with the gag lever post, rotate on the gag lever post and be connected with a plurality of moving contact, the terminal fixedly connected with metal wire of moving contact, the upper end lateral wall fixedly connected with coupling spring of gag lever post, coupling spring's tip and moving contact mounting panel's inner chamber diapire fixed connection, electric connection between metal wire and the current conducting plate.
Preferably, the static contact mounting plate is provided with a mounting groove matched with the conductive plate, the conductive plate is connected inside the static contact mounting plate in a clamping manner, and the limiting clamping seat is connected with the static contact mounting plate in a mounting manner through a screw.
Preferably, the magnetic force arc suppression assembly comprises a limit groove which is arranged inside the moving contact mounting plate, an inner cavity upper wall of the limit groove is fixedly connected with a pressing spring, an end part of the pressing spring is fixedly connected with a magnetic column, the magnetic column is in sliding sealing connection with the limit groove, the magnetic column is arranged in a hollow mode, the number of the limit grooves is two and is close to the end parts of the moving contact mounting plate, the end parts of the magnetic column are propped against the upper side wall of the static contact when the static contact contacts the moving contact, an upper end air inlet and a lower nozzle are respectively arranged at the upper end and the lower end of the magnetic column, side walls of the magnetic column are respectively provided with a side end air inlet and a bottom nozzle in an annular mode from top to bottom, and the bottom side nozzle is small in height and close to the bottom end of the magnetic column.
Preferably, the induction current interruption assembly comprises a connecting rod fixedly connected with the side wall of the magnetic column and a photoelectric sensor fixedly connected with the bottom wall of the movable contact mounting plate, the right end of the connecting rod is fixedly connected with a heat conducting rod, a sliding chute for the connecting rod and a mounting groove for the heat conducting rod to slide are arranged in the movable contact mounting plate, and an electric telescopic rod is arranged at the end part of the heat conducting rod.
Preferably, the heat conducting rod is made of high-heat-conductivity copper-nickel alloy, a thermal insulation coating is coated on the side wall of the photoelectric sensor, and the electric telescopic rod is electrically connected with the photoelectric sensor.
Preferably, the pneumatic arc extinguishing assembly comprises a lower gas storage cavity and an upper gas storage cavity which are arranged in the moving contact mounting plate, a connecting cavity is arranged at the right ends of the lower gas storage cavity and the upper gas storage cavity, the left ends of the lower gas storage cavity and the upper gas storage cavity respectively penetrate through the inner side walls of the limiting grooves to form gas outlet grooves, gas supplementing ports are arranged at the tops of the gas outlet grooves, check valves are arranged in the gas supplementing ports, the lower gas storage cavity and the upper gas storage cavity are respectively communicated with the connecting cavity and the mounting groove, the left ends of the moving contact mounting plate with the connecting cavity as a dividing line are made of ceramic-based composite materials, and high-pressure SF gas is filled in the lower gas storage cavity and the upper gas storage cavity through the gas supplementing ports and the connecting cavity.
Preferably, a pressure valve is arranged in the air outlet groove, the lower air storage cavity and the upper air storage cavity are arranged in the same specification, the mounting groove and the lower air storage cavity are arranged in the same width, the width of the output end of the electric telescopic rod is smaller than that of the upper air storage cavity, and the air inlet at the side end when the static contact piece is contacted with the movable contact piece is right opposite to the air outlet groove at the left side of the lower air storage cavity.
The beneficial effects of the invention are as follows:
when the contacts are opened (closed) to generate an arc, SF 6 gas is directly blown to the contacts generating the arc through the stretching and shrinking of the magnetic columns and the upward movement and downward pressing of the heat conducting rods, through the air outlet grooves and the nozzles with specific designs, and different postures and gas paths are adopted when the contacts are opened and closed, in the whole process, the interaction of the magnetic columns and the heat conducting rods and the cooperation of the air outlet grooves and the nozzles with specific designs ensure that SF 6 gas can be blown to the arc in the optimal postures and paths, so that quick and efficient arc extinction is realized, the integrity of circuits and equipment is protected, and the stable operation of a power grid is maintained;
When the temperature of the device exceeds a safety threshold or the electric arc is abnormal, the photoelectric sensor can rapidly detect and start an automatic protection mechanism, and the current is cut off through the cooperation of the heat conducting rod and the electric telescopic rod, and meanwhile, the arc extinguishing operation of SF 6 gas is triggered, so that double-layer protection is provided for the device to prevent the device from being damaged, and the safety of the whole electrical system is improved; the release of SF 6 gas and the action of the magnetic column are combined to form an effective arc extinguishing system, and the principle of magnetic field control and gas flow is fused, so that the electric arc can be rapidly processed when a circuit is closed, and the effective protection can be provided when the circuit is opened; because of combining the double effects of the magnetic field and the gas, the arc extinguishing effect is more remarkable, the magnetic field can effectively control the flow direction of SF 6 gas, and the SF 66 gas can rapidly extinguish the arc by utilizing the unique physical property of the SF 6 gas, and the synergistic effect ensures that the arc extinguishing system is more efficient and reliable in processing the arc.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an overall structure of a circuit breaker contact that is convenient to assemble according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a circuit breaker contact with easy assembly according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a static contact mounting plate of a circuit breaker contact structure, which is convenient to assemble according to an embodiment of the invention;
Fig. 4 is a schematic cross-sectional view of a circuit breaker contact structure for easy assembly according to an embodiment of the present invention;
Fig. 5 is a schematic view of a partial structure of a circuit breaker contact that is convenient to assemble according to an embodiment of the present invention;
Fig. 6 is an enlarged structural schematic diagram of a circuit breaker contact a according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electric telescopic rod of a circuit breaker contact, which is convenient to assemble and is provided by the embodiment of the invention;
fig. 8 is an enlarged schematic view of a circuit breaker contact structure B according to an embodiment of the present invention;
Fig. 9 is a schematic diagram of a gas flow direction structure when a contact of a circuit breaker contact structure is opened, which is convenient to assemble according to an embodiment of the present invention;
Fig. 10 is a schematic structural diagram of gas flow direction when a contact structure of a circuit breaker which is convenient to assemble is closed according to an embodiment of the invention.
In the figure: 1. a static contact mounting plate; 2. a moving contact mounting plate; 3. operating the connecting rod; 4. a limit clamping seat; 5. installing a clamping plate; 6. a magnetic column; 7. a chute; 8. a limit groove; 9. a lower gas storage chamber; 10. a photoelectric sensor; 11. a connecting rod; 12. a heat conduction rod; 13. an electric telescopic rod; 14. an air supplementing port; 101. a base conductive plate; 102. a stationary contact; 201. a conductive plate; 202. a movable contact; 203. a metal wire; 204. a limit rod; 205. a connecting spring; 501. limiting pin shafts; 601. a side end air inlet; 602. a bottom side spout; 603. a lower spout; 604. an upper air inlet; 801. pressing the spring; 901. an upper air storage chamber; 902. a connecting cavity; 903. and an air outlet groove.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Examples
Referring to fig. 1-3, a circuit breaker contact structure convenient to assembly, including static contact mounting panel 1 and moving contact mounting panel 2, there are base current-conducting plate 101 and static contact 102 in the top of static contact mounting panel 1 through the bolt mounting, the diapire of static contact 102 offsets with base current-conducting plate 101 top, the last lateral wall installation of moving contact mounting panel 2 is connected with operation connecting rod 3, the lower extreme of moving contact mounting panel 2 is provided with current-conducting plate 201, the top installation of current-conducting plate 201 is connected with spacing cassette 4, the left and right lateral wall of moving contact mounting panel 2 is all installed and is connected with installation cardboard 5, the lateral wall fixedly connected with spacing round pin axle 501 of installation cardboard 5, moving contact mounting panel 2 is rotated through spacing round pin axle 501 and is connected in spacing cassette 4 top, still include:
Magnetic arc suppression assembly: the magnetic arc suppression component is arranged in the movable contact mounting plate 2 and is used for reducing the generation of electric arcs at the contacts of the device;
Inductive current interruption assembly: the induction current interruption component is arranged on one side of the magnetic arc suppression component, and can automatically power off the device when a contact generates a large arc;
The pneumatic arc-extinguishing assembly is arranged on one side of the magnetic arc-suppressing assembly and can perform self-adaptive arc-extinguishing treatment on an arc generated when a contact is contacted or disconnected;
further, a limiting rod 204 is arranged in the moving contact mounting plate 2, a plurality of moving contact pieces 202 are rotationally connected to the limiting rod 204, a metal wire 203 is fixedly connected to the tail end of each moving contact piece 202, a connecting spring 205 is fixedly connected to the side wall of the upper end of each limiting rod 204, the end of each connecting spring 205 is fixedly connected with the bottom wall of the inner cavity of the moving contact mounting plate 2, the metal wire 203 is electrically connected with the conductive plate 201, the moving contact pieces 202 provide proper tension to maintain the posture through the rotating fit of the limiting rods 204 and the connecting springs 205, good electrical connection and response speed are ensured, a mounting groove matched with the conductive plate 201 is formed in the fixed contact mounting plate 1, the conductive plate 201 is clamped and mounted inside the fixed contact mounting plate 1, and a limiting clamping seat 4 is mounted and connected with the fixed contact mounting plate 1 through screws so as to facilitate assembly;
Referring to fig. 3-10, the magnetic arc suppression assembly comprises a limit groove 8 arranged in the moving contact mounting plate 2, an inner cavity upper wall of the limit groove 8 is fixedly connected with a pressing spring 801, the end part of the pressing spring 801 is fixedly connected with a magnetic column 6, the magnetic column 6 is in sliding sealing connection with the limit groove 8, the magnetic column 6 is arranged in a hollow mode, the number of the limit grooves 8 is two and is close to the end part of the moving contact mounting plate 2, the end part of the magnetic column 6 when the fixed contact 102 is in contact with the moving contact 202 is abutted against the upper side wall of the fixed contact 102, an upper end air inlet 604 and a lower nozzle 603 are respectively arranged at the upper end and the lower end of the magnetic column 6, side walls of the magnetic column 6 are respectively provided with a side end air inlet 601 and a bottom side nozzle 602 in an annular mode from top to bottom, the bottom side nozzle 602 is small in height and is close to the bottom end of the magnetic column 6, the magnetic column 6 adjusts internal air pressure through the end part and the nozzle of the side wall, and assists in arc suppression;
Further, the induction current interruption assembly comprises a connecting rod 11 fixedly connected with the side wall of the magnetic column 6 and a photoelectric sensor 10 fixedly connected with the bottom wall of the movable contact mounting plate 2, the right end of the connecting rod 11 is fixedly connected with a heat conducting rod 12, a sliding chute 7 for sliding the connecting rod 11 and a mounting groove for sliding the heat conducting rod 12 are arranged in the movable contact mounting plate 2, and an electric telescopic rod 13 is arranged at the end part of the heat conducting rod 12;
It should be noted that: the heat conducting rod 12 is made of high heat conducting copper-nickel alloy material and is used for conducting heat, a heat insulation coating is coated on the side wall of the photoelectric sensor 10, the electric telescopic rod 13 is electrically connected with the photoelectric sensor 10, and when the photoelectric sensor 10 detects a large electric arc, the electric telescopic rod 13 is controlled to rise, so that the magnetic column 6 can be controlled to jack up the movable contact mounting plate 2 under the drive of the connecting rod 11, and the automatic power-off treatment of the device is realized;
Further, the pneumatic arc extinguishing assembly comprises a lower gas storage cavity 9 and an upper gas storage cavity 901 which are arranged in the moving contact mounting plate 2, a connecting cavity 902 is arranged at the right ends of the lower gas storage cavity 9 and the upper gas storage cavity 901, a gas outlet groove 903 is formed in the inner side wall of the limiting groove 8 in a penetrating mode of the left ends of the lower gas storage cavity 9 and the upper gas storage cavity 901 respectively, a gas supplementing port 14 is formed in the top end of the gas outlet groove 903, a check valve is arranged in the gas supplementing port 14, the situation that gas flows back and overflows is avoided, the lower gas storage cavity 9 and the upper gas storage cavity 901 are respectively connected with the connecting cavity 902 and the mounting groove in a penetrating mode, the left ends of the moving contact mounting plate 2 taking the connecting cavity 902 as a boundary are made of ceramic-based composite materials, such as aluminum nitride or aluminum oxide ceramics, high temperature resistance and high thermal conductivity are achieved, heat conduction particles (such as carbon nanotubes) can be added to enhance the heat conductivity of the moving contact mounting plate, and the inside of the lower gas storage cavity 9 and the upper gas storage cavity 901 is filled with high-pressure SF 6 gas through the gas supplementing port 14 and the connecting cavity 902, and the gas supplementing port 14 can be supplemented when the gas is insufficient;
it should be noted that: the lower gas storage cavity 9 and the upper gas storage cavity 901 are arranged in the same specification, the mounting groove and the lower gas storage cavity 9 are arranged in the same width, the heat conducting rod 12 is ensured to completely block the lower gas storage cavity 9, so that the flow path of internal gas is changed, the width of the output end of the electric telescopic rod 13 is smaller than that of the upper gas storage cavity 901, the gas at the moment can pass through a gap between two sides of the output end of the electric telescopic rod 13 and the upper gas storage cavity 901, the side end gas inlet 601 when the static contact piece 102 is contacted with the movable contact piece 202 is opposite to the gas outlet groove 903 on the left side of the lower gas storage cavity 9, when an electric arc occurs, the lower gas storage cavity 9 can be subjected to high temperature firstly, and most of the gas inside the lower gas storage cavity 9, the connecting cavity 902 and the upper gas storage cavity 901 can overflow from the gas outlet groove 903 directly after being heated and expanded.
The working principle of the circuit breaker contact structure convenient to assemble is as follows: firstly, a base conductive plate 101 and a static contact 102 are installed on a static contact mounting plate 1, then an installation clamping plate 5 is installed on a moving contact mounting plate 2, a conductive plate 201 is clamped on the static contact mounting plate 1 through a limiting clamping seat 4 and fixed through a screw, and finally a limiting pin shaft 501 is clamped in the limiting clamping seat 4 to realize installation;
Since the contact surface of the butt contact changes with pressure, which may cause a bouncing phenomenon during switching on or off, which affects the contact reliability between the contacts and thus affects the stability of the whole circuit, the bouncing phenomenon usually occurs at an instant when the contacts are closed and opened, and at this time, the contacts are repeatedly contacted and separated rapidly, which may cause electric arcs and contact wear, which is particularly undesirable in applications requiring high precision or high reliability, the connecting spring 205 provides stable and continuous pressure, so as to ensure that the movable contact piece 202 maintains contact with the stationary contact piece 102 during operation, the elastic effect can reduce electric arcs and noise caused by unstable contact, the limit lever 204 ensures that the movable contact piece 202 moves within a defined range, prevents excessive displacement, and simultaneously limits the maximum moving distance of the movable contact piece 202, so that possible damages caused by excessive collision are reduced, and under the synergistic effect of the connecting spring 205 and the limit lever 204, the contact instability and the contact sticking caused by bouncing between the movable contact piece 202 and the stationary contact piece 102 are always reduced;
Arcing is typically due to electrical instability of the contact point when it is closed or opened, particularly in high voltage or high current applications, when the moving and stationary contacts are in contact or separated, even in a very short period of time, an air gap may form between the two, which gap is sufficient to ionize the air to create an arc that may not only damage the contacts, but also cause unnecessary energy loss and electromagnetic interference;
When the movable contact and the fixed contact are closed, the magnetic columns 6 on the two sides are extruded, the bottoms of the magnetic columns can form a magnetic field at the contact points of the movable contact and the fixed contact (namely the movable contact 202 and the fixed contact 102), the magnetic field can force an electric arc to move to the groove in the fixed contact mounting plate 1, and by moving the electric arc to the groove outside the contact, the erosion of contact materials can be remarkably reduced, so that the service life of the contact is prolonged, the arc extinction is facilitated to be realized more quickly, the duration of the electric arc is reduced when a circuit is disconnected, and the damage of high temperature generated by the electric arc to surrounding insulating materials and structural components is reduced;
When an opening signal is received, the operation connecting rod 3 drives the moving contact to be far away from the fixed contact, the circuit is opened, when the moving contact is opened and an electric arc is generated, at the moment, the magnetic column 6 stretches out outwards under the action of the pressing spring 801, the heat conducting rod 12 is driven to be pressed downwards under the action of the connecting rod 11, the lower gas storage cavity 9 is blocked by the pressed heat conducting rod 12 (the upper gas storage cavity 901 is in an opening state), SF 6 gas in the lower gas storage cavity 9 is heated by high temperature generated by the electric arc, heat is transferred to the inside of the upper gas storage cavity 901 through the heat conducting rod 12, heated SF 6 gas is mostly introduced into the inside of the upper gas storage cavity 901 after being expanded in volume and then introduced into the inside of the magnetic column 6 through the connecting cavity 902, and sprayed out through the gas flow path (refer to fig. 9), then introduced into the inside of the magnetic column 6 through the upper gas inlet 604, finally sprayed SF 6 gas flows to cool the space at the contact, the bottom side nozzle 602 and the lower nozzle 603, generated heat and ions are taken away, so that current is realized, the process effectively utilizes the SF 6 gas and the generated heat and the ions are rapidly diluted by the electric arc quenching gas, the characteristics are rapidly and stably cooled in the cooling direction of the electric arc-quenching equipment, and the electric arc is required to be rapidly cooled, and the electric arc is rapidly cooled and stably and the electric arc is cooled, and the electric current is required to be cooled, and the electric current is rapidly and cooled and the electric current is cooled and the electric power is cooled and the electric equipment is rapidly and cooled and the electric equipment is cooled and has the electric and has the electric and the electric arc is cooled;
When the operation connecting rod 3 receives a closing signal, the moving contact moves towards the fixed contact until the moving contact and the fixed contact are contacted to close the circuit, when the moving contact and the fixed contact are closed and generate an electric arc, the magnetic column 6 is contracted inwards and drives the heat conducting rod 12 to move upwards, the inner part of the upper gas storage cavity 901 is blocked, and because the lower gas storage cavity 9 is close to the position where the electric arc is generated, and at the moment, the gas outlet groove 903 at the lower gas storage cavity 9 is communicated with the side end gas inlet 601, most of high-pressure SF 6 gas which is expanded when encountering heat can be directly blown out through the gas outlet groove 903, and because the side end gas inlet 601 and the lower nozzle 603 are in a blocked state, the gas can only be blown to the contact position through the bottom nozzle 602 (refer to FIG. 10), and the sprayed SF 6 gas is directly blown to the contact where the electric arc is generated, and the electric arc is rapidly extinguished through cooling, dilution and insulation, so that the circuit can be safely and smoothly closed;
It should be noted that: the two processes are triggered when an electric arc is generated, when the electric arc is generated, the magnetic column 6 stretches out and drives the heat conducting rod 12 to press down through the connecting rod 11, and the action interacts with a magnetic field formed by the electric arc, so that the trend of gas flow can be enhanced, and SF 6 gas can be helped to be sprayed to a region needing arc extinction in a directional manner; meanwhile, SF 6 is heated and expanded in the lower air storage cavity 9 and sprayed out due to the high temperature of the electric arc, in the process, sprayed SF 6 gas plays a key role in arc extinction, so that an electric arc area is cooled, necessary insulating performance is provided for blocking current, and ions and other conductive particles generated by electric arc discharge are diluted and taken away; the two processes work cooperatively, so that the electric arc can be extinguished rapidly and efficiently, the integrity of a circuit and equipment is protected, and the stability of a power grid is maintained, in the process, the release of SF 6 gas and the action of the magnetic column 6 are combined to form an effective arc extinguishing system, the electric arc can be rapidly processed when the circuit is closed, the protection is provided when the circuit is opened, and the reliable operation of the circuit breaker and the safety of an electrical system are ensured;
If the temperature of the system exceeds a safety threshold or the electric arc is abnormal (when the temperature exceeds the threshold), an automatic protection mechanism is started, when the photoelectric sensor 10 detects the abnormality, the current is rapidly cut off through the matching of the heat conducting rod 12 and the electric telescopic rod 13 (refer to fig. 8), the protection device is not damaged, specifically, the photoelectric sensor 10 can control the electric telescopic rod 13 to extend out, at this time, because the total length of the heat conducting rod 12 and the electric telescopic rod 13 is increased, when the electric telescopic rod 13 is propped against the side wall of the upper gas storage cavity 901, the heat conducting rod 12 slides under the driving of acting force and reacting force, the magnetic column 6 is also lowered under the driving of the connecting rod 11, at this time, the magnetic column 6 can overcome the elasticity of the propping spring 801 to jack up the moving contact mounting plate 2, at this time, the moving contact 202 is disconnected with the static contact 102, at this time, the circuit is disconnected, and at the same time, the high-pressure SF 6 gas inside the upper gas storage cavity 901 and the lower gas storage cavity 9 is directly sprayed to the generating place for processing through the side gas inlet 601 and the bottom side nozzle 602, through the action sequence, the device can be automatically disconnected when the exceeding standard temperature or the electric arc is detected, the whole electric arc protection process is not damaged, and the electric accident safety is avoided;
In summary, the device realizes high-efficiency protection and stable operation of the circuit by comprehensively utilizing magnetic field control, SF 6 gas insulation and cooling characteristics and an automatic protection mechanism, and remarkably improves the safety and reliability of an electrical system.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
It should be noted that, specific model specifications of the motor need to be determined by selecting a model according to actual specifications of the device, and a specific model selection calculation method adopts the prior art in the field, so detailed description is omitted.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a circuit breaker contact structure convenient to assembly, includes static contact mounting panel (1) and moving contact mounting panel (2), the top of static contact mounting panel (1) is connected with base conducting plate (101) and static contact piece (102) through the bolt mounting, the diapire of static contact piece (102) offsets with base conducting plate (101) top, the last lateral wall installation of moving contact mounting panel (2) is connected with operation connecting rod (3), the lower extreme of moving contact mounting panel (2) is provided with conducting plate (201), the top installation of conducting plate (201) is connected with spacing cassette (4), the left and right lateral wall of moving contact mounting panel (2) is all installed and is connected with installation cardboard (5), the lateral wall fixedly connected with spacing round pin axle (501) of installation cardboard (5), moving contact mounting panel (2) are rotated through spacing round pin axle (501) and are connected with spacing cassette (4) top, its characterized in that still includes:
Magnetic arc suppression assembly: the magnetic arc suppression component is arranged in the moving contact mounting plate (2) and is used for reducing the generation of electric arcs at the contacts of the device;
Inductive current interruption assembly: the induction current interruption component is arranged on one side of the magnetic arc suppression component, and can automatically power off the device when a contact generates a large arc;
The pneumatic arc extinguishing assembly is arranged on one side of the magnetic arc suppressing assembly, and can perform self-adaptive arc extinguishing treatment on an arc generated when a contact is contacted or disconnected.
2. The circuit breaker contact structure convenient to assemble according to claim 1, wherein a limit rod (204) is arranged in the movable contact mounting plate (2), a plurality of movable contact pieces (202) are rotatably connected to the limit rod (204), a metal wire (203) is fixedly connected to the tail end of each movable contact piece (202), a connecting spring (205) is fixedly connected to the side wall of the upper end of each limit rod (204), the end of each connecting spring (205) is fixedly connected with the bottom wall of the inner cavity of the movable contact mounting plate (2), and the metal wire (203) is electrically connected with the conductive plate (201).
3. The circuit breaker contact structure convenient to assemble according to claim 2, wherein the fixed contact mounting plate (1) is provided with a mounting groove matched with the conductive plate (201), the conductive plate (201) is connected inside the fixed contact mounting plate (1) in a clamping and mounting manner, and the limiting clamping seat (4) is connected with the fixed contact mounting plate (1) in a mounting manner through screws.
4. The circuit breaker contact structure convenient to assemble according to claim 2, characterized in that, magnetic force is restrained arc subassembly and is included spacing groove (8) that moving contact mounting panel (2) inside set up, the inner chamber upper wall fixedly connected with of spacing groove (8) supports pressure spring (801), the tip fixedly connected with magnetic column (6) of pressure spring (801), sliding seal connects between magnetic column (6) and spacing groove (8), magnetic column (6) are the cavity setting, the quantity of spacing groove (8) is two and all is close to the tip of moving contact mounting panel (2), the tip of magnetic column (6) when static contact piece (102) and moving contact piece (202) contact offsets with the upper side wall of static contact piece (102), the upper end and the lower extreme of magnetic column (6) are provided with upper end air inlet (604) and lower spout (603) respectively, the lateral wall of magnetic column (6) is annular from last to being provided with side air inlet (601) respectively and bottom side air inlet (602) down, bottom side spout (602) is close to the bottom of spout (602) height setting.
5. The circuit breaker contact structure convenient to assemble according to claim 4, wherein the induction current breaking assembly comprises a connecting rod (11) fixedly connected with the side wall of the magnetic column (6) and a photoelectric sensor (10) fixedly connected with the bottom wall of the moving contact mounting plate (2), the right end of the connecting rod (11) is fixedly connected with a heat conducting rod (12), a sliding chute (7) for the connecting rod (11) and a mounting groove for the heat conducting rod (12) to slide are arranged in the moving contact mounting plate (2), and an electric telescopic rod (13) is arranged at the end part of the heat conducting rod (12).
6. The circuit breaker contact structure convenient to assemble according to claim 5, wherein the heat conducting rod (12) is made of high-heat-conductivity copper-nickel alloy, a thermal insulation coating is coated on the side wall of the photoelectric sensor (10), and the electric telescopic rod (13) is electrically connected with the photoelectric sensor (10).
7. The circuit breaker contact structure convenient to assemble according to claim 5, wherein the pneumatic arc extinguishing component comprises a lower gas storage cavity (9) and an upper gas storage cavity (901) which are arranged in a moving contact mounting plate (2), a connecting cavity (902) is arranged at the right end of the lower gas storage cavity (9) and the right end of the upper gas storage cavity (901), gas outlet grooves (903) are respectively formed in the left ends of the lower gas storage cavity (9) and the upper gas storage cavity (901) in a penetrating mode through the inner side walls of the limiting grooves (8), gas supplementing ports (14) are formed in the top ends of the gas outlet grooves (903), check valves are arranged in the gas supplementing ports (14), the lower gas storage cavity (9), the upper gas storage cavity (901) are respectively in penetrating connection with the connecting cavity (902) and the mounting grooves, the left ends of the moving contact mounting plate (2) with the connecting cavity (902) as a dividing line are made of ceramic-based composite materials, and high-pressure SF 6 gas is filled in the lower gas storage cavity (9) and the upper gas storage cavity (901) through the gas supplementing ports (14) and the connecting cavities (902).
8. The circuit breaker contact structure convenient to assemble according to claim 7, wherein a pressure valve is arranged in the air outlet groove (903), the lower air storage cavity (9) and the upper air storage cavity (901) are arranged in the same specification, the mounting groove and the lower air storage cavity (9) are arranged in the same width, the width of the output end of the electric telescopic rod (13) is smaller than that of the upper air storage cavity (901), and the side air inlet (601) when the static contact piece (102) is in contact with the movable contact piece (202) is opposite to the air outlet groove (903) on the left side of the lower air storage cavity (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410516299.XA CN118098899B (en) | 2024-04-28 | 2024-04-28 | Circuit breaker contact structure convenient to assembly |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410516299.XA CN118098899B (en) | 2024-04-28 | 2024-04-28 | Circuit breaker contact structure convenient to assembly |
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| CN118098899A true CN118098899A (en) | 2024-05-28 |
| CN118098899B CN118098899B (en) | 2024-07-09 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4139752A (en) * | 1975-05-30 | 1979-02-13 | Mitsubishi Denki Kabushiki Kaisha | Gas-type circuit-breaker |
| CN104637724A (en) * | 2015-03-02 | 2015-05-20 | 周盈裕 | Environment-friendly arc extinguish chamber for magnetic circuit breaker |
| CN110086111A (en) * | 2019-04-17 | 2019-08-02 | 西安交通大学 | A kind of liquid nitrogen switch and its working method |
| CN215771043U (en) * | 2021-08-10 | 2022-02-08 | 徐州汉通电子科技有限公司 | Arc extinguishing device of circuit breaker |
| CN115312352A (en) * | 2022-09-02 | 2022-11-08 | 民众电气科技有限公司 | Side-mounted vacuum circuit breaker with intelligent monitoring system |
| CN116230466A (en) * | 2023-04-07 | 2023-06-06 | 浙江人民电器有限公司 | High breaking plug-in circuit breaker of heavy current |
-
2024
- 2024-04-28 CN CN202410516299.XA patent/CN118098899B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4139752A (en) * | 1975-05-30 | 1979-02-13 | Mitsubishi Denki Kabushiki Kaisha | Gas-type circuit-breaker |
| CN104637724A (en) * | 2015-03-02 | 2015-05-20 | 周盈裕 | Environment-friendly arc extinguish chamber for magnetic circuit breaker |
| CN110086111A (en) * | 2019-04-17 | 2019-08-02 | 西安交通大学 | A kind of liquid nitrogen switch and its working method |
| CN215771043U (en) * | 2021-08-10 | 2022-02-08 | 徐州汉通电子科技有限公司 | Arc extinguishing device of circuit breaker |
| CN115312352A (en) * | 2022-09-02 | 2022-11-08 | 民众电气科技有限公司 | Side-mounted vacuum circuit breaker with intelligent monitoring system |
| CN116230466A (en) * | 2023-04-07 | 2023-06-06 | 浙江人民电器有限公司 | High breaking plug-in circuit breaker of heavy current |
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| CN118098899B (en) | 2024-07-09 |
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