192 results about "Breaking capacity" patented technology

The utility model relates to the technical field of circuit breaker structures, in particular to a rotating shaft structure of a double-breakpoint molded case circuit breaker, which is characterized in that a rotating shaft main body is of an integral structure design, a contact groove is formed in the rotating shaft main body along the radial direction, the middle part of a moving contact is inserted into the contact groove, and two ends of the moving contact penetrate out along an opening of the contact groove; the static spring shaft and the moving spring shaft are used for being in butt joint with the static contact, the static spring shaft and the moving spring shaft are located on the two sides of the moving contact respectively, the two ends of the contact spring are connected to the static spring shaft and the moving spring shaft respectively, and the moving spring shaft is pulled through elastic tension of the contact spring so that the two sides of the moving contact can abut against the inner side wall of the contact groove respectively. Due to the integral structure design of the rotating shaft main body, the three-phase synchronism of the molded case circuit breaker is consistent, the limit breaking capacity and the operation breaking capacity of the circuit breaker are greatly improved, the safety and the reliability of the circuit breaker in operation are improved, and the electrical life of the circuit breaker is prolonged.

The invention relates to a pole-mounted circuit breaker monitoring method and system, electronic equipment and a medium. The method comprises the following steps: acquiring a voltage recovery waveform characteristic and a mechanical vibration characteristic during operation of a vacuum arc-extinguishing chamber, and performing timestamp alignment; calculating a contact gap conductive channel risk value based on the aligned waveform characteristics; generating breaking capacity attenuation trend characteristics by combining the historical breaking current peak value, the breaking times and the risk value; calculating the remaining service life according to the trend characteristics, and synchronously obtaining a fault probability value according to the conductive channel risk value; and finally, according to the residual service life and the fault probability value, determining a maintenance early warning level and outputting a maintenance early warning signal. Therefore, according to the method, the risk of the conductive channel is evaluated through fusion of the operation waveform and the mechanical signal, and the breaking capacity attenuation trend is extrapolated along the historical breaking data, so that online evaluation and advanced early warning of the health state of the pole-mounted circuit breaker are realized, and the operation reliability and the operation and maintenance efficiency of the key node of the power distribution network are improved.

The application relates to the field of low-voltage electrical apparatus, in particular to a contact system and a switch electrical apparatus comprising the same, the contact system comprising a pivotally arranged rotary contact structure and at least one movable contact structure, the rotary contact structure comprising a rotary contact, the rotary contact comprising a rotary contact part, the movable contact structure comprising a movable contact, the movable contact comprising a movable contact part, the rotary contact part and the movable contact part being combined to make the rotary contact and the movable contact closed when the rotary contact is in a closed position; the movable contact structure further comprising an elastic member matched with the movable contact; during the breaking process of the rotary contact and the movable contact, the elastic member stores energy when the rotary contact part drives the movable contact part to move from an initial position to a disengagement position, the rotary contact continues to rotate, the elastic member releases energy to drive the movable contact part to reset to the initial position; the contact system and the switch electrical apparatus have high breaking capacity.

This application relates to the field of circuit breakers, specifically disclosing a high breaking capacity measuring switch, which includes a housing, a moving contact rotatably disposed within the housing, and a stationary contact disposed within the housing. It also includes an arc-extinguishing chamber and an arc-pulling assembly disposed on the arc-extinguishing chamber. The arc-pulling assembly is located on the side of the moving contact away from the stationary contact. The arc-pulling assembly includes a first permanent magnet and a second permanent magnet symmetrically arranged, with an arc-pulling channel formed between the first and second permanent magnets. The arc-pulling channel is located on the moving path of the moving contact. This application improves the arc-extinguishing performance of the measuring switch.

The invention provides a magnetic field enhanced SF6 circuit breaker intelligent control method and device. According to the method, waveform feature extraction and spectral analysis are carried out by acquiring arc state parameters, an intelligent decision model is constructed by adopting a hybrid machine learning and reinforcement learning algorithm to generate an optimal arc extinguishing control strategy, and differential control is implemented in different stages of an arc: an electromagnetic coil is activated in the initial stage to generate a high-intensity magnetic field to apply Lorentz force; synergistically adjusting the magnetic field and airflow in the middle stage, and strengthening airflow cooling in the later stage; meanwhile, the medium recovery characteristic is monitored, the reignition probability is calculated in real time, protection measures are triggered, the fault diagnosis function is integrated, intelligent arc extinguishing control over the SF6 circuit breaker is achieved, and the large-current breaking capacity and reliability are remarkably improved.

The invention discloses a surface-mounted tubular fuse structure and a preparation method thereof, and belongs to the technical field of overcurrent protection electronic components. The fuse structure comprises an insulating tube, a fuse body, an arc extinguishing body, an inner copper cap, an outer copper cap and a sealing colloid. The fuse body is arranged in the insulating tube body, the arc extinguishing body is filled in the insulating tube body and wraps the fuse body, the inner copper cap and the outer copper cap form a combined electrode cap, the sealing colloid is filled between the end part of the insulating tube body and a circular inner cap of the combined electrode cap, and the circular inner copper cap and the end part of the insulating tube body realize preliminary airtight packaging through welding or interference fit. And the sealing colloid is combined for secondary reinforced sealing, and the square outer copper cap provides a flat surface-mounted welding surface. The preparation method comprises the process steps of inner copper cap pressing, threading and spot welding, arc extinguishing material potting, outer copper cap assembling, sealant potting and the like. The problems that a traditional tubular fuse is large in installation space, has reliability hidden danger and is limited in high breaking capacity are solved. The fuse is widely applied to the technical field of tubular fuses.

The invention relates to the technical field of copper alloy contacts, in particular to a method for modifying the surface of a copper-chromium contact by adopting a surface laser remelting technology. Comprising the following steps: S1, carrying out sand blasting treatment on the copper-chromium contact; s2, carrying out laser remelting on the copper-chromium contact subjected to sand blasting treatment; and S3, the copper-chromium contact obtained after laser remelting is placed in magnetic grinding equipment, grinding treatment is conducted for 8-12 min, and the modified copper-chromium contact is obtained. The surface of the copper-chromium contact is modified through the laser remelting technology, refining of chromium phase particles can be effectively promoted, and a continuous and compact fine grain strengthening layer with a certain thickness is constructed on the surface layer of the alloy, so that the voltage resistance strength, the breaking capacity and the fusion welding resistance of the copper-chromium contact are comprehensively enhanced.

The circuit breaker comprises a shell, an operating mechanism, a traction rod, a protection mechanism, at least one rotating shaft system, and a static contact and an arc extinguish chamber which respectively correspond to the rotating shaft system, the protection mechanism comprises at least one air blowing mechanism, the rotating shaft system, the static contact and the arc extinguish chamber are arranged at intervals in the width direction of the circuit breaker, the operating mechanism is located above the rotating shaft system, the arc extinguish chamber is located above the static contact, and the arc extinguish chamber is located on one side of the operating mechanism in the length direction of the circuit breaker. The draw bar is rotatably arranged on the other side of the operating mechanism, the length direction of the air blowing mechanism is arranged along the length direction of the circuit breaker, one end of the air blowing mechanism in the length direction is located between two adjacent arc extinguish chambers, and the other end of the air blowing mechanism in the length direction is arranged opposite to the draw bar; the sliding direction of the push rod of the air blowing mechanism is arranged along the length of the circuit breaker. According to the circuit breaker, the overall layout of the circuit breaker is compact and reasonable, the air blowing mechanism is horizontally arranged in the circuit breaker, and the breaking capacity of the circuit breaker is improved.

The application relates to a winding type melt fuse, which comprises a shell, a melt arranged in the shell, and contact blades arranged outside the shell and connected with both ends of the melt respectively, wherein a single-layer non-enclosed cylindrical coiled elastic sheet is arranged in the shell, the melt is wound on the outer periphery of the elastic sheet, and a melting weak part of the melt is arranged at an opening on the cylindrical outer periphery of the elastic sheet. The melt fuse can shorten the melt breaking time, improve the breaking capacity and arc extinguishing capacity.

This utility model relates to a double-acting arc-extinguishing chamber based on ball screw transmission, including a housing, a moving contact and a stationary contact disposed within the housing, a ball screw rotatably disposed within the housing, a first fixed block fixedly connected to the moving contact, and a second fixed block fixedly connected to the stationary contact. One end of the ball screw is connected to a drive device. The ball screw has a first threaded section and a second threaded section with opposite directions of rotation. The first fixed block is threadedly connected to the first threaded section, and the second fixed block is threadedly connected to the second threaded section. A first guide rail is fixedly disposed on the housing, slidingly engaging with the first fixed block, and a second guide rail is slidably engaged with the second fixed block. This utility model, through ball screw transmission, converts rotational motion into linear motion of the first and second fixed blocks, realizing the opposite or opposite movements of the moving and stationary contacts, improving the closing and opening speeds of the arc-extinguishing chamber, shortening the breaking time, and effectively improving the breaking capacity of the circuit breaker.

This application provides an arc-blocking device and a circuit breaker, belonging to the field of electrical equipment technology. In this arc-blocking device, one end of an elastic element is connected to the circuit breaker housing, and the other end is connected to an arc-blocking element, which is located on the movement trajectory of the circuit breaker's moving contact. When the moving and stationary contacts of the circuit breaker are in contact, the arc-blocking element is located on the side of the moving contact facing away from the stationary contact. During the separation process of the moving and stationary contacts, the moving contact pushes against the first side of the arc-blocking element, causing the arc-blocking element to drive the elastic element to bend and deform in the first direction until the moving contact slips off from the first side. Then, under the elastic force of the elastic element, the arc-blocking element moves in the second direction to between the moving and stationary contacts, thereby forcibly cutting off the arc generated when the moving and stationary contacts separate. It has good breaking capacity and can effectively improve the arc-extinguishing capability of the circuit breaker. Furthermore, the arc-blocking device provided in this embodiment has a simple structure, is easy to assemble, operates reliably, and has a certain degree of universality.

The invention discloses a surge protector, and relates to the technical field of overvoltage protection equipment, and the surge protector comprises a first separation unit and a second separation unit which are connected in series. The first separation unit comprises a first pole piece of the piezoresistor and an electrode piece electrically connected with the wire inlet end, and the first pole piece and the electrode piece are connected through soldering tin to form a first breakpoint. The second separating unit comprises a second pole piece of the piezoresistor, a moving contact electrically connected with the wire outlet end and a separating mechanism, the moving contact is in contact with the second pole piece to form a second breakpoint, the separating mechanism comprises a sliding block and an elastic piece, the electrode piece is fixed to the sliding block, and the sliding block is provided with a firing pin. When surge occurs in the circuit, the soldering tin is fused to disconnect the first breakpoint, the sliding block slides under the action of the elastic piece, and the firing pin pushes the moving contact to be separated from the second pole piece to achieve disconnection of the second breakpoint. According to the surge protector provided by the invention, the breaking capacity of the surge protector can be improved, and the risk of electrical accidents caused by untimely breaking is reduced.

The application discloses a fuse shell and a fuse, and relates to the technical field of fuses, wherein the fuse shell comprises a shell body, at least one first partition and at least one second partition, the shell body is formed with an arc-extinguishing cavity and a buffer cavity distributed along a first direction; the first partition and the second partition are distributed along the first direction, the at least one first partition is arranged between the arc-extinguishing cavity and the buffer cavity, and the at least one second partition is arranged in the buffer cavity; wherein the first partition is provided with a first air vent, the second partition is provided with a second air vent, and the first air vent and the second air vent are arranged in a staggered mode along the first direction. The technical scheme of the application sets the first partition between the arc-extinguishing cavity and the buffer cavity, at least sets the second partition in the buffer cavity, and arranges the first air vent on the first partition and the second air vent on the second partition in a staggered mode, so that the breaking capacity of the fuse is improved, and the breaking effect of zero flying arc is facilitated to be realized.

The invention relates to an SF6 circuit breaker breaking capacity evaluation method and device based on an arc black box model and a medium. The method comprises the steps that a voltage value and a current value in the breaking process of an SF6 circuit breaker are collected; collecting an arcing interval input charge quantity and gas pressure in an arc extinguish chamber under the current on-off working condition; a fitting arc voltage curve is calculated through the voltage value and the current value in the breaking process, and a set of Mayr model parameters are selected according to the difference value between the fitting arc quenching peak and the actual arc quenching peak of the fitting arc voltage curve; substituting the Mayr model parameters, the input charge quantity and the gas pressure in the arc extinguish chamber into a dimensionless relational expression constructed based on dimensional analysis for solving to obtain an on-off constant, determined by historical on-off test data, of the SF6 circuit breaker; and calculating the predicted arc extinguishing peak voltage of the to-be-evaluated SF6 circuit breaker under each on-off working condition so as to evaluate the on-off capability of the to-be-evaluated SF6 circuit breaker. Compared with the prior art, the method has the advantages of low cost, high efficiency, high universality and the like.

The invention discloses an anti-rebound strong-breaking high-voltage direct-current relay, and the relay comprises a static assembly which is disposed in a relay housing, is used for forming a static conductive and magnetic circuit foundation of the relay, provides a second section of counterforce in the pull-in process of the relay, inhibits the pull-in rebound of a contact, and assists in enhancing the breaking force during breaking. And the movable assembly is arranged in the relay shell and is used for realizing dynamic on-off actions of the contacts. According to the invention, the three-section counter-force design is optimized and combined with the tower-shaped spring, so that the collision energy and bounce of the movable contact can be reduced, the arc generation and the component loss are reduced, and the bonding risk is reduced; breaking force is provided through the synergistic effect of the main spring, the counter-force spring and the magnetic steel, the contact can be assisted to be rapidly separated, and therefore fusion welding is overcome, arc extinguishing is accelerated, and contact damage is reduced. Through the magnetic steel directional polarity and closed magnetic circuit design, the magnetic field intensity can be enhanced, the pull-in response time can be shortened, and the magnetic leakage can be reduced, so that the pull-in force and the holding force can be enhanced, and the contact looseness can be avoided.

The utility model discloses a kind of moulded case circuit breaker conducting systems, including base, multiple contact cavities are formed by multiple arrangement settings baffle in the base, multiple rotating cavities are opened in the base middle part in contact cavity opposite position, movable contact assembly is rotatably connected in the rotating cavity, static contact assembly that is installed in contact cavity is cooperated with movable contact assembly and realizes on-off, connection position is opened in the base surface front end, the static contact assembly includes static contact, first arc-extinguishing chamber and fixed baffle, one end of the static contact is set in contact cavity, the other end of the static contact extends to connection position, first arc-extinguishing chamber is installed below static contact, fixed baffle is arranged in first arc-extinguishing chamber opposite position on the surface of static contact upper side, and the bottom of fixed baffle is contacted with the outer wall of first arc-extinguishing chamber. By setting two arc-extinguishing chamber arrangement and positioning, the breaking capacity, safety reliability and service life of moulded case circuit breaker are significantly improved.

The invention provides a full-range fuse. The full-range fuse comprises a base, a supporting device, a current-limiting fuse assembly, a jet fuse drop assembly, a first static contact and a second static contact, the first static contact and the second static contact are respectively arranged at two end parts of the base; the current-limiting fuse assembly and the jet fuse drop assembly are both arranged on the supporting device and are in conductive connection, the current-limiting fuse assembly and the jet fuse drop assembly have a preset overlapping part, and a first moving contact of the current-limiting fuse assembly is in conductive connection with a first static contact. A second moving contact and a second static contact of the injection type fuse drop assembly are in conductive connection. The first moving contact and the first static contact are disconnected after the current-limiting fuse assembly is fused, and the second moving contact is turned over relative to the second static contact after the jet fuse drop-out assembly is fused, so that the first moving contact and the first static contact are disconnected. According to the invention, rapid breaking of full-range current is realized, and the short-circuit breaking capacity is improved.

The utility model relates to the field of circuit protection and contactors, in particular to an integrated motion type excitation integrated contactor which comprises a movable contact bridge, a static contact, a movable iron core, a static iron core, a movable guide rod, an excitation ignition assembly, a piston, an auxiliary contact assembly and at least one melt, and the melt is connected with the auxiliary contact assembly in series. The two ends of the auxiliary contact assembly and the melt which are connected in series are conductively connected with a static contact of the contactor, in the initial position, the auxiliary contact assembly is arranged in an insulated mode, and the melt and the static contact are not conducted; the excitation ignition assembly acts according to a received trigger signal and drives the piston to displace, the piston drives the static iron core, the movable iron core and the movable guide rod to displace, so that the auxiliary contact assembly is switched on, and after the melt is connected into a main loop in a parallel connection mode and a contact system of the contactor is driven to be switched off, the melt is disconnected in a mechanical mode. Under the normal function of the contactor, the power consumption of the contactor during normal work is reduced, and the breaking capacity of the contactor is improved.

The utility model discloses a waterproof high breaking direct current contactor, which comprises a shell, and a contact system and an electromagnetic driving mechanism which are arranged in the shell, the contact system comprises a static contact and a moving contact, an opening and closing gap is formed between the static contact and the moving contact, and the electromagnetic driving mechanism drives the moving contact to be close to and far away from the static contact; the shell comprises a bottom shell, a middle shell and an upper cover which are sequentially connected from bottom to top, sealing gaskets are arranged at the joint of the bottom shell and the middle shell and the joint of the middle shell and the upper cover, the electromagnetic driving mechanism is installed in the bottom shell, a contact chamber is arranged between the middle shell and the upper cover, the contact system is located in the contact chamber, and a magnet is fixed to the side portion of an opening and closing gap in the contact chamber; through the arrangement of the sealing gasket and the magnet, the sealing waterproof performance of the DC contactor can be improved, arc extinguishing can be accelerated, the breaking capacity can be enhanced, and the product performance can be improved.

The invention relates to an intelligent circuit breaker which comprises a shell, an arc extinguishing system and an operating mechanism. The operating mechanism is an electromagnetic opening and closing mechanism and is integrated with a short-circuit opening identification structure and a mechanical locking device. The electromagnetic opening and closing mechanism adopts electromagnetic direct drive, the short-circuit induction coil and the trip coil are horizontally arranged in parallel and share the magnetic circuit component, and the structure is compact. The short-circuit opening identification structure is matched with a switch on a circuit board through a trigger part at the tail part of a tripping lever, and a short-circuit signal is mechanically triggered and reported. The mechanical locking device physically blocks the movement of the closing mechanism at the locking position through the movable locking piece so as to prevent accidental closing. The device integrates efficient driving, accurate fault identification and absolute safety interlocking, and has the advantages of compact structure, fast action, strong breaking capacity, high reliability, good safety, high intelligent degree and the like.

The invention provides a circuit breaker which comprises a shell and an arc extinguish chamber, an N-pole exhaust channel and an L-pole exhaust channel are arranged in the shell, the shell is provided with an exhaust port, the exhaust end of the N-pole exhaust channel and the exhaust end of the L-pole exhaust channel are communicated with the exhaust port, and the N-pole exhaust channel and the L-pole exhaust channel are each provided with at least one circulation cavity. And the arc extinguish chambers are respectively arranged in the N-pole exhaust channel and the L-pole exhaust channel. According to the circuit breaker provided by the invention, by adopting the double-exhaust structure of the N-pole exhaust channel and the L-pole exhaust channel and the arrangement of the circulating cavity, the arc extinguishing and exhaust efficiency is improved, the exhaust efficiency is improved, the breaking capacity of the circuit breaker is further improved, the use efficiency and use safety of the circuit breaker are improved, and the service life of the circuit breaker is prolonged. The problem that the use safety and the service life of a product are affected due to poor breaking capacity of a circuit breaker in the prior art is solved.

The utility model provides a kind of contact structure of parallel double-break point plastic shell circuit breaker, including pivot, the pivot is equipped with installation port, further include contact assembly, the contact assembly includes movable contact rod, pivot shaft and torsion spring, the pivot shaft is installed in installation port, the movable contact rod includes respectively located pivot both sides contact end and limit end, the contact end is used for installing contact, the torsion spring is sleeved on pivot shaft, and one end is abutted on limit end, the other end is abutted on the side of pivot towards contact end, the movable contact rod and torsion spring are both symmetrically provided with two groups, the contact end of two groups of movable contact rod forms double-break point, two groups the movable contact rod are linked in parallel and are all pivoted with pivot and pivot cooperation. The utility model can increase the contact area of contact, reduce loop resistance and can improve breaking capacity.

The utility model belongs to the field of electrical technology, and particularly relates to a contact assembly and a circuit breaker, and the contact assembly comprises a moving contact which is provided with a moving contact, and the moving contact is located at one end of the moving contact; the static contact is provided with at least two static contact points, the at least two static contact points are sequentially arranged at one end of the static contact at intervals, and the static contact points and the movable contact points are arranged oppositely; wherein the moving contact can move towards the side close to or away from the static contact, so that the moving contact is in contact with the at least two static contacts. Contact resistance can be reduced, the heating phenomenon can be reduced, local energy accumulation can be avoided, and therefore the service life of the circuit breaker is prolonged, and the breaking capacity of the circuit breaker is improved.

The application discloses a high-voltage and small-size excitation fuse, which comprises a shell, an excitation source arranged in the shell, a power device, a conductor penetrating through the shell and a fuse body arranged in the shell and connected in parallel with the conductor, wherein the impact end of the power device comprises at least two spaced-apart cutter heads, corresponding pre-breaking points are arranged on the conductor and the fuse body respectively and correspondingly to the positions of the cutter heads, the fuse body penetrates through an arc extinguishing chamber in the shell, and the fuse breaking weak position of the fuse body is located in the arc extinguishing chamber; under the drive of the excitation source, the power device can sequentially break the pre-breaking points on the conductor and the fuse body to form breaking points. The application has small size, and improves breaking capacity and arc extinguishing capacity.

The invention provides a preparation method of a high-performance CuCr electrical contact material for a high-voltage vacuum circuit breaker, and relates to the technical field of electrical contacts of high-voltage vacuum circuit breakers, and the preparation method comprises the steps of raw material preparation and proportioning, mechanical alloying activation pretreatment, spark plasma rapid sintering densification, solution treatment and aging treatment. High-purity electrolytic copper powder and high-purity chromium powder are selected, copper and chromium elements are subjected to mechanical alloying activation treatment under argon protection, the treated composite alloy powder is made into a compact copper-chromium sintered blank through pulse large current, and then the compact copper-chromium sintered blank is subjected to solid-liquid and aging treatment; according to the invention, the uniform mixing of copper and chromium elements is realized by adopting mechanical alloying, nearly full densification is completed at low temperature by combining with a spark plasma rapid sintering technology, grain coarsening is effectively inhibited, the production efficiency and the material performance are remarkably improved, and the breaking capacity, the electrical life and the operation reliability of a high-voltage vacuum circuit breaker are greatly improved by the CuCr electrical contact.

The application provides a method for diagnosing the performance of a molded case circuit breaker, belonging to the technical field of molded case circuit breakers, comprising the following steps: S1: collecting the gas temperature data of the exhaust port of the arc extinguishing chamber in real time through a temperature sensor; S2: extracting temperature characteristic parameters based on the temperature data; S3: based on the preset hierarchical threshold system of the temperature characteristic parameters, combining the multi-feature cross-validation logic of each performance dimension, respectively comprehensively judging the contact performance, arc extinguishing chamber performance and breaking capacity of the molded case circuit breaker; S4: generating corresponding hierarchical fault early warning information or performance evaluation reports according to the performance judgment results. The application collects the gas temperature data of the exhaust port of the arc extinguishing chamber, extracts multi-dimensional temperature characteristic parameters, combines the hierarchical threshold system and the multi-feature cross-validation logic, realizes direct and accurate diagnosis of the contact performance, arc extinguishing chamber performance and breaking capacity, and solves the problems of early warning lag and high misjudgment rate caused by the dependence on indirect indexes in the prior art.

This invention relates to the field of fuse technology, specifically a surface-mount fuse, comprising an insulating shell and a molten metal element. The insulating shell has side cavities and an inner platform. The side cavities are located at both ends of the inner platform. A narrow cavity communicating with the side cavities is located within the inner platform, and the cross-sectional area of ​​the side cavities is larger than that of the narrow cavity. The molten metal element is disposed through the narrow cavity, with both ends of the molten metal element positioned within the side cavities. The surface-mount fuse of this invention has advantages such as high breaking capacity, lead-free design, simple manufacturing process, and low cost. The design of the insulating shell in this invention incorporates four arc-extinguishing mechanisms: the rapid cooling effect of the high thermal conductivity of quartz sand on the electric arc; increased mechanical strength and impact resistance due to the thicker wall in the middle of the shell; arc-extinguishing effect of arc-extinguishing gas generated by the high-temperature ablation of the shell surface; and increased cross-sectional area of ​​the inner holes at both ends of the shell to provide pressure relief space. These mechanisms improve the breaking capacity of the product.

The utility model relates to an air-blowing tripping structure and a circuit breaker, and the air-blowing tripping structure comprises a housing which is located between two adjacent breaking units of the circuit breaker; one end of the ejector rod is located in the shell and rotationally connected with the shell, the other end of the ejector rod is located outside the shell and corresponds to a push rod of a circuit breaker operating mechanism, the two sides of the ejector rod make contact with the inner wall of the shell to divide the interior of the shell into a gas collection cavity and a movable cavity, and the gas collection cavity is communicated with an arc extinguish chamber of the breaking unit; the limiting structure is fixedly arranged in the gas collecting cavity; the spring is used for elastically connecting the ejector rod with the shell, and the limiting structure is used for limiting the ejector rod, so that the spring is in a compressed state; the gas from the arc extinguish chamber enters the gas collection cavity and pushes the push rod, so that the push rod overcomes the elastic force of the spring to swing, and the push rod pushes the push rod to separate the moving contact and the static contact of the circuit breaker. Therefore, the performance requirement of the circuit breaker with high breaking capacity is met, the action range and force of the blowing mechanism are increased, and the sensitivity of the air-blowing tripping mechanism and the safety performance of the circuit breaker are improved.

The utility model relates to a shell structure adapting to high breaking capacity of a circuit breaker and the circuit breaker, the shell structure comprises a base, the base is used for assembling a plurality of breaking units, the base structurally comprises a seat body, the seat body is provided with a plurality of through grooves in one-to-one correspondence with the breaking units, the seat body is provided with bayonets, and the bayonets are arranged in the through grooves. The bayonet is matched with the exhaust port of the breaking unit, so that the exhaust port is communicated with one end of the through groove, and the other end of the through groove is communicated with the outside of the base; and the cover plate is detachably connected with the seat body and is matched with the plurality of through grooves to form a plurality of exhaust channels, so that the thickness size and the manufacturing cost of the circuit breaker are reduced under the condition that the arc extinguishing effect and the equipment and personal safety are ensured.

The application discloses a small fuse based on multi-layer composite arc extinguishing and double-sensitive triggering, and relates to the technical field of fuses.The fuse comprises a base, an internal combined unit, an external mounting unit and an arc extinguishing processing unit.The fuse has a buckle type fast mounting terminal structure, is compatible with two modes of vertical plugging and horizontal surface mounting, and has multi-layer arc extinguishing measures, so that the arc extinguishing capacity is effectively improved.The fuse has a simulated serpentine hollow design, can prolong the melting path under the same volume, and improve the breaking capacity.The PTC thermistor is integrated at the end, can trigger the fuse in advance when the temperature is abnormal, supports the temperature and current double triggering conditions, realizes double circuit breaking protection, and has a fuse identification which is convenient for maintenance personnel to identify, indicates that the internal fuse ring is fused after the indicating slide rod is popped out from the upper end of the cover, and the internal fuse ring is convenient for dismounting and replacing.