463 results about "Breaking capacity" patented technology

The utility model relates to the field of circuit protection, in particular to a contactor integrated with an excitation function, and an excitation ignition assembly, a first piston, a first conductive part, an auxiliary contact system, a push rod, a melt, an air passage, a second piston and an elastic part are integrated in the contactor. The melt and the auxiliary contact system are connected in series and then are connected in series between the two static contacts. In a normal working state, the auxiliary contact system is insulated and disconnected, when an overload current, a short-circuit current or an abnormal condition occurs, the ignition assembly is excited to act to drive the first piston and the first conductive piece to move, the first conductive piece enables the auxiliary contact system to be conducted and closed, and the melt is connected into a main loop in a parallel connection mode; and then the second piston and the elastic piece are driven to displace through the air passage, so that the contact system is switched off, the elastic piece generates irreversible deformation, and the first piston and the first conductive piece push the push rod to disconnect the melt. According to the invention, the power loss is low, zero-current cut-off of a main loop can be realized, and the breaking capacity and the breaking reliability are improved.

The utility model relates to the field of circuit protection, in particular to an excitation integrated contactor with high breaking capacity, which comprises a driving system and a contact system, and further comprises an integrated excitation source, an excitation action assembly and an elastic piece, the elastic piece is arranged for one moving contact, one end of the elastic piece is fixed, the other end of the elastic piece is a free end, the excitation action assembly is fixedly connected with the free end of the elastic piece, the excitation source drives the excitation action assembly to move, the contact system is forcibly opened, and meanwhile, the elastic piece generates elastic deformation capable of restoring to the initial position; and the elastic piece, the moving contact and the excitation action assembly are all reset to initial positions during normal opening. The contactor has normal functions of the contactor and also has large current breaking and resetting functions, so that normal use of the contactor is ensured while the breaking range of the contactor is widened.

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 an operating mechanism of a dual-power automatic change-over switch, which comprises a shell and an automatic change-over assembly, and is characterized in that the automatic change-over assembly comprises a mechanism frame, a motor, a change-over disc, a change-over shaft, a first rotating frame, a first change-over pull plate, two first energy storage springs, a second rotating frame, a second change-over pull plate, two second energy storage springs and a change-over driving part; a driving part is arranged on the side, facing the first rotating frame, of the conversion driving part in a linkage mode, a shifting shaft matched with the driving part is arranged at one end of the first rotating frame, a shifting groove matched with the shifting shaft is formed in the driving part, and one end of the shifting shaft moves along with the first rotating frame and moves in the shifting groove in a reciprocating mode. And linkage matching between the driving piece and the first rotating frame is formed. The circuit breaker has the advantages of simple structure, stable and reliable performance, rapid and reliable conversion and high breaking capacity.

The invention relates to a disconnecting switch and a high breaking arc extinguish chamber with surrounding type grid pieces arranged in a staggered mode, the high breaking arc extinguish chamber comprises a first arc extinguish grid piece set and a second arc extinguish grid piece set which are the same in structure and an arc extinguish chamber framework, and grid piece clamping grooves are formed in the two sides of the arc extinguish chamber framework. The first arc-extinguishing grid sheet group and the second arc-extinguishing grid sheet group are respectively arranged on two sides of the arc-extinguishing chamber framework through grid sheet clamping grooves, and each of the first arc-extinguishing grid sheet group and the second arc-extinguishing grid sheet group comprises a plurality of grid sheets which are arranged longitudinally, a plurality of grid sheets which are arranged transversely, and connecting grid sheets which are used for connecting the longitudinal grid sheets and the transverse grid sheets; and the longitudinal grid sheets and the transverse grid sheets arranged on the arc extinguishing grid sheet group are respectively and correspondingly arranged in a staggered manner. Compared with a conventional layout, the number of the arc extinguishing grid sheets is greatly increased under the condition that the occupied space is not changed, so that the arc extinguishing performance under the unit volume is enhanced, and the safety, the stability and the switching-on and switching-off capability are improved.

The invention relates to a method, a device and equipment for detecting the breaking capacity of a circuit breaker, a medium and a program product. The method comprises the following steps: acquiring a simulation model of a target circuit breaker, current breaking current and current arcing time; according to the simulation model, the current breaking current and the current arcing time, analog simulation is conducted on the working process of the target circuit breaker, and working temperature information of the target circuit breaker is obtained, the working temperature information represents a working temperature change state of the target circuit breaker in an arc combustion process and a medium recovery process; and detecting the breaking capacity of the target circuit breaker according to the working temperature information. By adopting the method, the detection accuracy of the breaking capacity of the circuit breaker can be improved.

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 present application relates to a high-breaking-power fuse, comprising a protective tube; a contact blade, which is sealed and arranged on both ends of the protective tube, and is used to form an arc-extinguishing cavity on the inner side of the protective tube; a fuse, which is arranged in the arc-extinguishing cavity; a conductive connecting piece, which is arranged at the disconnection point between the fuse and the circuit where the contact blade is located; an overload installation box, which is arranged in the arc-extinguishing cavity, and the overload installation box is provided with a mounting cavity and a connecting hole; a connecting rod, one end of which is arranged in the mounting cavity, and the other end slides in and out of the connecting hole, and an arc-extinguishing filling area connected to the connecting hole is formed between the mounting cavity and the connecting rod; a connecting solder, which is arranged between the fuse and the end of the connecting rod outside the mounting cavity, and is used to conduct the disconnection point between the fuse and the circuit where the contact blade is located; a breaking spring, which is connected to the connecting rod and is used to retract the connecting rod into the mounting cavity; and an arc-extinguishing medium, which is filled with overpressure and arranged in the arc-extinguishing cavity. The present application has the effect of improving the arc-extinguishing performance of the fuse.

The invention relates to a fuse and electric equipment. The fuse comprises a shell, an electric connection unit, an action unit and an excitation unit. The shell is provided with a first cavity and a second cavity, and a communicating hole is formed in the cavity wall of the first cavity so that the first cavity can communicate with the second cavity. The electric connection unit is mounted on the shell and comprises a connection bar and a melt which are connected in parallel; the action unit comprises a first breaker movably installed in the first chamber and a second breaker movably installed in the second chamber. The excitation unit is mounted on the shell; wherein the excitation unit is used for driving the first disjunction device to disconnect the connecting bar, and is also used for driving the second disjunction device to disconnect the melt after the first disjunction device disconnects the connecting bar; and when the first breaking device does not cut off the connecting row, the first breaking device blocks the communicating hole. The invention aims to provide the fuse with the arc extinguishing capability and the breaking capability.

The invention relates to the technical field of low-voltage electric appliances, in particular to an arc extinguishing system and a circuit breaker. The arc extinguishing system comprises a shell and an arc extinguishing chamber; a mounting cavity is formed in the shell, and the arc extinguish chamber is arranged in the mounting cavity; a plurality of air outlet holes for exhausting air to the outside are formed in one end of the mounting cavity; the arc extinguishing chamber is provided with an arc extinguishing cavity; a pressure relief channel is further arranged in the mounting cavity, an inlet of the pressure relief channel is communicated with the arc extinguishing cavity, and an outlet of the pressure relief channel is communicated with the air outlet hole. Through the pressure relief channel, the problem that gas impacts the moving and static contacts to cause damage to the moving and static contacts can be avoided; the phenomenon that a large amount of gas carrying charged particles flows between the moving contact and the static contact to cause breakdown between the moving contact and the static contact can be relieved, and the breaking capacity of the arc extinguishing system is further improved; in addition, charged particles or electric arcs entering the pressure relief channel can be gradually cooled in the pressure relief channel, and therefore the arc extinction effect is improved.

The invention discloses a vacuum arc extinguish chamber structure with large rated current and strong breaking capacity, which comprises a structure body, and is characterized in that the structure body comprises a static contact assembly, the static contact assembly comprises a static end arc contact and a static end main contact, and the static end arc contact is arranged in front of the static end main contact and protrudes for a preset distance d along the on-off direction; and the moving contact assembly comprises a moving end main contact and a moving end arc contact, and the moving end main contact and the moving end arc contact are located on the same plane. According to the invention, the effect that the main contact does not burn arc during breaking is realized, the contact surface of the main contact is protected from being ablated by the arc, and a physical foundation is laid for the high capacity of the vacuum arc-extinguishing chamber. The moving end arc contact is provided with a coil structure so as to generate a transverse magnetic field or a longitudinal magnetic field, and the magnetic lines of force between the static end arc contact and the moving end arc contact have the combined action of the longitudinal magnetic field and the transverse magnetic field, so that the breaking capacity is high.

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.

The invention discloses a method for detecting aging of electrical breaking capacity of C4F7N / CO2 mixed gas. The method comprises the following steps: taking a proper amount of sample gas to be detected after the C4F7N / CO2 mixed gas is subjected to multiple arcing breaking through a ring main unit; carrying out gas chromatography-mass spectrometry detection on the sample gas to obtain a mass spectrum of the sample gas; analyzing and determining a decomposition product in the sample gas and the peak area of each product in the mass spectrum; when the number of arcing times is small, the aging degree of the mixed gas is judged according to the types of the generated products, and when the number of arcing times is large, the aging degree of the mixed gas is judged according to the change of the proportional relation between the peak areas of the products in the mass spectrum. According to the method, gas aging judgment is performed in a product proportion form, so that the accuracy of gas aging judgment is improved.

A double-breakpoint circuit breaker for a direct current system is characterized in that the double-breakpoint circuit breaker comprises an operating handle (1), the operating handle (1) is linked with a rotating shaft (3) through an upper connecting rod (2), a jump pin (6) and a lock catch (7), the rotating shaft (3) is connected with a double-breakpoint moving contact system (a) through a lower connecting rod (4), and the rotating shaft (3) can be driven to rotate through the upper connecting rod (2), the jump pin (6) and the lock catch (7) in the rotating process of the operating handle (1). And the rotating shaft (3) can drive the double-breakpoint moving contact system (a) to move up and down through the lower connecting rod (4) in the rotating process, so that the double-breakpoint moving contact system (a) and the corresponding double-breakpoint static contact system (b) are contacted and separated to realize the on-off of the circuit breaker. According to the circuit breaker, the rotation of the handle is converted into the up-and-down movement of the moving contact system through the improvement of the rotating shaft structure and the installation position, the purpose of double breakpoints is achieved, and the up-and-down movement of the double-breakpoint moving contact system is not required to be linear movement. The moving contact keeps a trend of rotating towards two sides under the action of the pressure spring so as to realize close contact with the static contact assembly, the installation difficulty of a product is simplified, the reliability and the stability of motion transmission are improved, meanwhile, due to the layout of the whole circuit breaker, more arc extinguishing grid sheets can be arranged in the circuit breaker, and the breaking capacity of the circuit breaker is improved.

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 utility model relates to the technical field of low-voltage switching devices, in particular to an arc extinguishing grid plate and an arc extinguishing chamber. The arc extinguishing grid sheet provided by the utility model comprises a body; the upper end of the body is provided with a first end face and a second end face, and the first end face and the second end face are different in height. The upper end of the body is provided with at least one arc cutting groove located between the first end face and the second end face, and the arc cutting groove penetrates through the two sides of the body in the thickness direction of the body. When the arc extinguishing grid sheets are assembled into a grid sheet group in a positive and negative staggered manner, the first end face and the second end face which are not equal in height can enable the notches of the grid sheet group to be arranged in a front and back staggered manner, the grid sheet group is located below the edges of the two sides of the moving contact of the contact assembly, after the point of the moving contact discharges, the arc can directly correspond to the notches of the arc cutting grooves, and the resistance cut by the body is smaller; the first end face and the second end face which are not equal in height can enable the notches of the grid plate group to be arranged in a front-back staggered mode, cutting and lengthening of electric arcs are facilitated, and the technical effects of improving the electric arc breaking capacity and rapidly extinguishing the arcs can be achieved.

The utility model relates to a recoverable excitation integrated contactor with active and passive integrated protection, which comprises a driving system, a contact system, an excitation ignition assembly, a magnetic tripping device, a microswitch, a first piston, a second piston, a melt cutting push rod, an auxiliary contact system and an arc extinguishing melt, the drive coil loop is connected with a trigger loop of the excitation ignition assembly in parallel and connected with a normally-closed contact and a normally-open contact of the microswitch in series, the state change of the drive coil loop and the trigger loop is controlled through a magnetic tripping device linked with the microswitch, and a trigger signal is provided for the excitation ignition assembly. The first piston is driven to enable the auxiliary contact system to be conducted so that the arc extinguishing melt can be connected to the main loop in parallel, the second piston is driven to drive the elastic piece to move so that the contact system can be forcibly opened, and then the first piston drives the melt cutting-off push rod to disconnect the arc extinguishing melt. Through excitation integration, the breaking capacity of the contactor is improved, and the current matching difficulty with the fuse is reduced; and after the protection action, the normal switching-on and switching-off functions of the contactor are maintained.

The invention relates to the technical field of low-voltage apparatus switches, and particularly discloses an arc extinguishing structure and a circuit breaker, and the arc extinguishing structure comprises an arc extinguishing grid sheet group and a magnetic arc extinguishing assembly which are matched with a contact assembly. The arc extinguishing grid sheet group and the magnetic arc extinguishing assembly are arranged along a motion path of the moving contact, the magnetic arc extinguishing assembly is used for applying an acting force to an electric arc at the contact assembly, and the direction of the acting force intersects with a motion plane of the moving contact in the contact assembly. According to the invention, the arc extinguishing capability of the contact assembly can be enhanced without increasing the volume of the arc extinguishing chamber, so that the breaking capability of the direct current switch to direct current high voltage is effectively improved.

The utility model relates to an arc extinguishing system of a molded case circuit breaker. The arc extinguishing system comprises an arc extinguishing chamber, an arc extinguishing grid sheet group, a short arc extinguishing grid group, an arc isolating piece, an arc isolating cover, an arc striking plate and a magnetism increasing plate, wherein the arc extinguishing grid sheet group is arranged in the arc extinguishing chamber, and one side of the arc extinguishing grid sheet group is provided with a moving contact abdicating space; the static contact is U-shaped, the front end is used for connecting the connecting plate, and the rear end is used for contacting with the moving contact; a short arc chute group is arranged below the arc chute sheet group; the end tab is connected to the rear end of the static contact and extends to the lower side of the short arc chute group; the arc-isolating cover covers the rear end of the static contact, and the arc-isolating piece covers the static contact and extends from the front end to be connected with the arc-isolating cover so as to wrap the static contact in an insulating manner. Compared with the prior art, through the ingenious structural design, all-around insulation protection on the static contact is achieved in a narrow space left between the static contact and the arc extinguish chamber, the breaking capacity of the circuit breaker is improved, the electrical service life of the circuit breaker is prolonged, a local magnetism increasing structure is additionally arranged, the breaking capacity is improved, the electrical service life of the circuit breaker is prolonged, and meanwhile cost is saved.

The utility model relates to the field of circuit protection and contactors, in particular to an excitation integrated contactor, an excitation action assembly, an auxiliary contact assembly, a melt and a melt disconnection assembly are integrated in the contactor, and the melt is conductively connected with a static contact through the auxiliary contact assembly to form a melt parallel branch; the piston does not act in a normal through-flow state, and the contactor performs switching-on and switching-off in a normal working state; in case of overload current, short-circuit current or abnormal conditions, the fuse body parallel branch is conducted through the excitation action assembly, so that the fuse body is connected into the main loop, and then the fuse body is disconnected after the contactor is forcibly opened through the excitation action assembly. According to the invention, under the normal function of the contactor, the fuse can be connected into the main loop for auxiliary arc extinguishing under the overload, short circuit or abnormal condition, so that the breaking capacity of the contactor is improved, and a large fracture is formed between contact systems of the contactor.

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 present disclosure relates to the technical field of power, and provides an arc isolation structure, a contact unit, and a relay. The arc isolation structure comprises a first arc isolation member, the first arc isolation member being arranged on the exterior of a static contact lead-out end, and a pair of static contact lead-out ends being in contact with or separated from a moving reed; a first step and / or a first gap are / is arranged between the first arc isolation member and the static contact lead-out end so as to obstruct arc transfer. The first step and / or the first gap may prevent an arc from transferring towards a direction in which the pair of static contact lead-out ends are close to and facing one another, preventing the occurrence of a situation that two sets of moving contacts and static contacts between the moving reed and the pair of static contact lead-out ends generate arc shorting and short-circuiting. The first step and / or the first gap may prevent an arc from transferring upwards along outer walls of the static contact lead-out ends in a direction away from the moving reed, further reducing ablation of the outer walls of the static contact lead-out ends by the arc, and improving an arc extinguishing capability and effect, so as to improve break-off capabilities between moving contacts and static contacts corresponding to the moving reed and the static contact lead-out ends.

The invention relates to the field of circuit protection and contactors, in particular to a three-stable-state permanent magnet contactor, which comprises a driving system and a contact system, and is characterized in that the driving system comprises a driving coil, a permanent magnet assembly, a movable iron core, a first static iron core, a second static iron core and a first counter-force elastic piece; the magnetic field force is generated through forward energization of the driving coil, or power failure or reverse energization of the driving coil, normal closing, normal opening and large-fracture opening are achieved under the combined action of the first counter-force elastic piece and the permanent magnet assembly, and the magnetic field force is generated by adjusting the energization current and energization time of the driving coil. Under the combined action of the first counter-force elastic piece and the permanent magnet assembly, each mechanism after large-fracture opening can be reset to a normal opening position or a normal closing position. According to the three-stable-state permanent magnet contactor, the repeatable actions of normal opening and closing, abnormal opening and mechanism resetting can be achieved, the breaking capacity of the contactor is improved while the function of the contactor is improved, and the service life of the contactor is prolonged.

The utility model discloses a breaker arc extinguishing exhaust system, which comprises an arc extinguishing chamber body, and a plurality of upper exhaust holes and a plurality of lower exhaust holes which are arranged at the rear end of the arc extinguishing chamber body in a vertically staggered manner, a shell is internally provided with a plurality of groups of partition plate structures which divide an exhaust area into a plurality of exhaust channels, and the plurality of exhaust channels are communicated with the upper exhaust holes and the lower exhaust holes. According to the structure that the partition plate is composed of the upper partition rib and the lower partition rib which abut against each other up and down, in order to avoid the upper exhaust hole and the lower exhaust hole, the staggered parts which are partially overlapped and extend in a staggered mode are arranged between the upper partition rib and the lower partition rib, and the structural layout between the partition ribs and the exhaust holes is reasonably optimized, so that the upper exhaust hole and the lower exhaust hole are prevented from being blocked by the upper partition rib and the lower partition rib; according to the utility model, the arc extinguish chamber body is provided with the plurality of exhaust channels, so that the exhaust smoothness of the arc extinguish chamber body is ensured, the temperature rise and pressure in the arc extinguish chamber are reduced, the explosion risk is reduced, and the electrical insulation performance among the plurality of exhaust channels is realized, thereby improving the arc extinguish capacity and breaking capacity of the product.

The present invention discloses a method for generating the short - circuit breaking voltage and current waveforms of a circuit breaker and obtaining parameters, which is characterized in that by obtaining the positive - sequence reactance X1, positive - sequence resistance R1, and zero - sequence reactance X0 of the node where the circuit breaker is located, the total current, alternating - current component current, direct - current component current, and power - frequency recovery voltage during the short - circuit breaking process of the circuit breaker are calculated by applying a three - phase equivalent circuit model. Further, the parameters of the last half - wave of the short - circuit breaking current are obtained: the duration ΔT, the peak value I peak , the direct - current component p at the current zero - crossing point, and from p, the di / dt at the current zero - crossing point and the TRV parameters under the condition of modified asymmetrical short - circuit breaking can be calculated. The short - circuit breaking voltage and current parameters of the high - voltage alternating - current circuit breaker obtained by the method of the present invention can provide reference and basis for the evaluation of the breaking capacity of the circuit breaker and phase - selective breaking.

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 invention discloses a double-vacuum fracture multifunctional outdoor pole-mounted switch, which comprises a switch body, an operating mechanism, a transmission mechanism, two vacuum arc-extinguishing chambers, a current transformer and a controller, and is characterized in that the two vacuum arc-extinguishing chambers comprise a first vacuum arc-extinguishing chamber and a second vacuum arc-extinguishing chamber; the first vacuum arc-extinguishing chamber and the second vacuum arc-extinguishing chamber are arranged on the two sides of the same pole in a series connection mode, the first vacuum arc-extinguishing chamber and the second vacuum arc-extinguishing chamber are arranged in series, a single-time breaking task is distributed to the two arc-extinguishing chambers, the short-circuit current breaking capacity is remarkably improved, the contact ablation risk is reduced, the service life of the switch is prolonged, and the service life of the switch is prolonged. The mechanical interlocking design of the manual operation unit and the electric operation unit ensures that emergency operation can still be carried out through a circuit breaker opening and closing handle when a power failure occurs or a control system breaks down, an isolation operation handle independently controls an isolation static contact through an isolation insulation pull rod, step-by-step operation of the circuit breaker and an isolation disconnecting link is achieved, the maintenance safety requirement is met, and the maintenance cost is reduced. And the mistaken touch risk is reduced.

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.

A direct current contactor contact structure comprises an insulating base and two static contacts, a push rod is connected below the insulating base, a contact hoop is installed above the insulating base, a moving contact is installed in the contact hoop, and a spring is installed between the lower surface of the moving contact and the bottom of an inner cavity of the contact hoop. The lower surfaces of the two static contacts vertically correspond to the two ends of the upper surface of the moving contact respectively. Two sides of the upper surface of the moving contact are respectively provided with a contact blade, the middle of the contact blade is provided with a strip-shaped notch, and the strip-shaped notch divides the contact blade into a left contact blade and a right contact blade; and a plurality of spiral grooves are uniformly formed in the lower surface of the static contact in a central symmetry manner. According to the utility model, the defects in the prior art are overcome, the breaking capacity of the contact can be effectively improved, and the thermal load generated by the arc root on the surface of the electrode is reduced, so that the problem that the surface of the contact is locally and seriously melted is prevented.