447 results about "Vacuum arc" patented technology

The invention relates to the technical field of fault diagnosis, in particular to a pole-mounted circuit breaker fault diagnosis method based on multi-information fusion, and the method comprises the steps: firstly obtaining electric quantity modal data such as three-phase current and coil current and mechanical quantity modal data such as mechanism vibration and voiceprint, and constructing a time-frequency domain alignment feature tensor; then, through a graph space-time attention fusion model, deeply mining physical structure association and time sequence evolution laws among heterogeneous data, and generating a dynamic space-time feature matrix; then, respectively constructing a mechanical evidence body for representing the state of the transmission chain of the operating mechanism and an electrical evidence body for representing the working condition of the vacuum arc-extinguishing chamber by adopting a feature level-decision level mixed framework; an improved D-S evidence theory is applied for fusion, when high-conflict evidences are detected, a self-adaptive arbitration mechanism is automatically triggered, conflict weights are dynamically attenuated or distributed to uncertain items, misjudgment is effectively avoided, and high-robustness collaborative diagnosis of the electromechanical state is achieved.

The invention belongs to the technical field of research and development of fast neutron reactor jackets and structural materials, and particularly relates to a high-temperature-lead-bismuth-corrosion-resistant high-silicon-content ferrite / martensite steel ladle tube and a preparation method thereof. According to the mass percentage, the composition mainly comprises the following components: 0.16-0.24% of C; 0.4 to 0.8 percent of Mn; cr: 11.6% to 12.4%; 1.2 to 1.8 percent of W; 0.1 to 0.4 percent of Ta; 0.2 to 0.4 percent of V; 1.0%-1.8% of Si and Fe. The preparation method comprises the steps of vacuum induction and vacuum arc remelting. Carrying out homogenization treatment and forging; extruding and annealing; cold rolling and annealing; and performing normalizing and tempering treatment. Through an efficient short-flow process route and reasonable smelting, pipe machining deformation and heat treatment processes, the microscopic structure of the material is remarkably improved, then the mechanical property and high-temperature lead and bismuth corrosion resistance of the finished pipe are improved, and the use requirement of the lead and bismuth cooling fast reactor fuel assembly cladding material under the high-temperature working condition is met.

The invention relates to the technical field of power equipment, in particular to a vacuum pole-mounted circuit breaker, which comprises a vacuum arc-extinguishing chamber and a mechanism box, a static contact and a moving contact are inserted in the vacuum arc-extinguishing chamber, and under the action of the mechanism box, the moving contact can be close to or far away from the static contact and can be conducted with the static contact; a conductive part is arranged between the static contact and the moving contact, the conductive part can generate elastic deformation, can be in stop fit with the static contact or the moving contact, and is configured to be conducted with the static contact and the moving contact before the static contact and the moving contact are conducted. Therefore, the problem of arc erosion between the static contact and the moving contact is effectively avoided in a mode of transferring an arc generation position, the bounce amplitude of the moving contact is reduced by utilizing the elastic deformation characteristic of the conductive part, the service life of the static contact and the moving contact can be ensured while the wear of the static contact and the moving contact is reduced, and the service life of the static contact and the moving contact is prolonged. And the conductivity between the static contact and the moving contact can be ensured.

The invention relates to the technical field of high-voltage electric appliance detection, in particular to a device and method for detecting the vacuum degree of a vacuum arc-extinguishing chamber, and the method comprises the steps: arranging a field emission cathode on one metal end cover of the vacuum arc-extinguishing chamber; an anode is arranged on the metal shielding cover close to the field emission cathode in the vacuum arc-extinguishing chamber; the high-voltage direct-current power supply is connected to the field emission cathode and the anode and is used for applying voltage to the electrodes so as to drive the field emission cathode to emit electron beams to impact the anode; the X-ray energy spectrum detector directly faces the anode, the X-ray energy spectrum detector is used for measuring bremsstrahlung X-ray energy spectrum generated when the electron beam impacts the anode, an electron emission source is actively arranged in the arc extinguish chamber, and the distribution of the X-ray energy spectrum generated by the electron emission source is measured. And high signal-to-noise ratio, high-precision and high-sensitivity vacuum degree quantitative detection is realized by utilizing the strong correlation between the energy spectrum form and the internal gas pressure.

The invention relates to a primary and secondary fusion complete column-mounted circuit breaker, which comprises a circuit breaker body, a column mounting frame, a voltage transformer, an electronic sensor, a drop-out fuse and a controller, and is characterized in that the circuit breaker body is provided with an operation base and a plurality of solid-sealed polar poles arranged on the operation base; a vacuum arc-extinguishing chamber is arranged in the upper end of a vertical section of the solid-sealed polar pole, a connecting wire extending horizontally is arranged in a transverse section of the solid-sealed polar pole, opening and closing of the vacuum arc-extinguishing chamber are driven by an operation base, and the solid-sealed polar pole further comprises a limiting assembly arranged in the solid-sealed polar pole and a conductive linkage assembly arranged in the limiting assembly. The conductive wire connecting assembly is arranged in the limiting assembly, and the accelerating assembly is arranged in the limiting assembly and located below the mounting sleeve, so that the opening speed is accelerated. The beneficial effects of the invention lie in that the linkage assembly connected with the movable conducting rod and the driving rod realizes switching-on power-on and switching-off power-off, and can also cooperate with the acceleration assembly so as to accelerate the switching-off speed.

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 invention discloses a NH4H2PO4-CaCO3 modified high-performance AB2 type hydrogen storage alloy and a preparation method thereof. The chemical formula of the AB2 type hydrogen storage alloy is TiaZr (1-a-b) YbMnxCr (1.8-x) Fe (0.2), and the mass ratio of the AB2 type hydrogen storage alloy to NH4H2PO4 to CaCO3 is 98: 1: 1; the preparation method comprises the following steps: 1, selecting a metal elementary substance raw material; 2, performing vacuum arc melting to obtain an alloy ingot; 3, crushing and grinding the alloy cast ingot; and 4, drying the powder with NH4H2PO4 and CaCO3 powder, and then carrying out ball milling and mixing. According to the alloy, by controlling the content of Cr, Mn, Fe and Y elements, the activation performance at the room temperature is improved, the hydrogen absorption rate is increased, the hydrogen storage capacity is increased, NH4H2PO4 and CaCO3 are combined for modification, the spontaneous combustion tendency of hydrogen absorption state powder in air is reduced, and the alloy is suitable for the field of solid hydrogen storage.

The invention discloses a super-fusion pole-mounted switch device, belongs to the technical field of switch devices, and discloses the super-fusion pole-mounted switch device which comprises a switch body, a power taking unit and a feeder terminal. The switch body comprises a deep fusion solid-sealed polar pole which is integrally poured, a vacuum arc extinguish chamber, an isolating switch contact and a voltage and current sensor are integrated in the switch body, and the electricity taking unit supplies power to the deep fusion solid-sealed polar pole through a separable spring electric contact structure; the feeder terminal is embedded in the switch box body and is operated in a hot-line mode through a special operating rod. The invention further provides a transient electromagnetic interference suppression module which is used for eliminating electromagnetic interference in the equipment. The CLC topological power taking unit can adapt to multiple working conditions; the state monitoring module is fused with multi-source data to diagnose faults, and the problems that an existing primary and secondary fusion column switch is low in fusion degree, weak in anti-electromagnetic interference, poor in electricity taking reliability and low in intelligence are solved. The equipment can supply power to the 10kV power distribution network intelligently, the reliability is improved, and the operation and maintenance cost is reduced.

The invention relates to the field of circuit breakers, and provides a circuit breaker which comprises an insulating shell and a pull rod mechanism, a power connection end is arranged on the side face of the insulating shell, the circuit breaker further comprises a first capacitor and a second capacitor, and the first capacitor is arranged in the insulating shell and electrically connected with a first conductive metal body of the power connection end; the second capacitor is arranged in the insulating shell, a second conductive metal body electrically connected with the second capacitor is arranged at the end part of a moving contact of the vacuum arc-extinguishing chamber of the insulating shell, and a first interface and a second interface are arranged on the side wall or the end part of the insulating shell. The circuit breaker is connected for use, and the power connection end is connected with external detection or feedback equipment, so that the working state of the circuit breaker is monitored and fed back in real time. When the circuit breaker is disconnected, the first capacitor and the second capacitor can be used for detection so as to determine whether the interior of the circuit breaker is completely powered off, that is, no residual voltage exists on the power connection end and the moving contact part, so that safe and reliable operation is ensured.

A vacuum induction melting (VIM) furnace and method of using. A VIM is configured for use with metal-containing carbon powders. In operation, the metal-containing carbon powders are formed into a pellet so as to minimize or eliminate ejection of material during introduction of the pellet into the VIM processor. The VIM processor may be substituted or used in combination with a vacuum arc melt processing apparatus, an electron beam melt furnace, an ion plating furnace, a plasma flame source, a smelter, a traditional metal-metal melt furnace, or any equivalent. Pelletizing can be accomplished through use of a press or through application of any pelletizing technique and / or use of any apparatus that is able to generate pellets that have sufficient mass to avoid ejection from a VIM processor.

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 invention relates to the technical field of electric power, in particular to a vacuum circuit breaker and a phase selection closing control method, and the vacuum circuit breaker comprises a hybrid electromagnetic mechanism and a vacuum arc-extinguishing chamber; the hybrid electromagnetic mechanism comprises a permanent magnet closing assembly and an electromagnetic repulsion opening assembly, the permanent magnet closing assembly comprises double coils and a T-shaped movable iron core which are arranged in parallel, and a discharge loop is formed to drive a movable contact of the vacuum arc-extinguishing chamber to complete a closing action and maintain a closing state; the electromagnetic repulsion opening assembly comprises a static coil panel and a moving coil panel which are coaxially and oppositely arranged to form a reverse current repulsion loop so as to drive a moving contact of the vacuum arc-extinguishing chamber to complete an opening action and maintain an opening state, and the moving coil panel is connected with a T-shaped moving iron core of the permanent magnet closing assembly through an insulating guide rod; the vacuum arc-extinguishing chamber comprises a driving connecting rod, a moving contact and a static contact, one end of the driving connecting rod is connected with the moving contact, and the other end of the driving connecting rod is connected with the insulating guide rod. Therefore, the opening and closing speed of the vacuum circuit breaker is improved.

The utility model relates to the technical field of electric power, in particular to a solid-sealed polar pole, which is applied to a medium-voltage power grid and used for extracting current signals, voltage signals and a power-taking power supply from the medium-voltage power grid, and further comprises a vacuum arc-extinguishing chamber, the transition piece and the spring contact finger are movably connected to the output end of the vacuum arc-extinguishing chamber; the conducting rod is connected with the spring contact finger and extends to the wire outlet side of the medium-voltage power grid; the current and voltage sensor group comprises an incoming line side voltage sensor of which the high-voltage end is connected with the incoming line side of the medium-voltage power grid and the low-voltage end is grounded; the high-voltage end of the wire outlet side voltage sensor is connected with the conducting rod, and the low-voltage end is grounded; the zero sequence current sensor and the phase current sensor are sleeved on the conducting rod; the high-voltage low-temperature-drift ceramic capacitor is adopted, one-time integral solid sealing is achieved, meanwhile, the current and voltage sensor set and the capacitor electricity-taking power source set are integrated, one-time integral solid sealing is achieved, the manufacturing process is simplified, and the insulation reliability is improved.

The application provides a high-strength and high-damping titanium-based eutectic alloy, and belongs to the field of new material research and preparation. 70‑x‑y Nb x Zr y Fe 30 ) 100‑a‑b Sn a O b Wherein, 0.1<=x<=5, 0.1<=y<=5, 0.1<=a<=5, 0.1<=b<=1. Commercial industrial pure Ti, Fe, Nb, Zr, Sn and TiO2 are used as raw materials to prepare the target alloy, vacuum arc melting technology is used to melt and prepare the alloy ingot, and then copper mold casting technology is used to obtain the required alloy plate. The alloy of the application is (near) eutectic composition, the alloy melt has good fluidity and excellent casting performance; the eutectic structure formed by the alloy can have Snoek relaxation coupling effect, so that the material has better damping performance (Q ‑1 >0.03), the room temperature compression yield strength of the material is more than 2GPa, and in addition, the addition of a small amount of Nb, Zr and Sn elements can refine the alloy structure, and the mechanical properties and damping performance of the alloy are obviously improved.

The invention discloses a circuit breaker with external vacuum arc extinguish chambers, and belongs to the technical field of circuit breakers, the circuit breaker with the external vacuum arc extinguish chambers comprises a circuit breaker body, the circuit breaker body is provided with a plurality of external arc extinguish chambers, the top of each external arc extinguish chamber is fixedly provided with a terminal, the side wall of each terminal is fixedly provided with a cushion block, and the cushion blocks are fixedly connected with the external arc extinguish chambers. A fixed clamping jaw is movably arranged outside the cushion block, the other ends of the multiple arc-shaped rods are jointly and fixedly provided with a top grading ring, two connecting rods are fixedly arranged at the bottom of the top grading ring, and a bottom grading ring is fixedly arranged at the bottoms of the two connecting rods. According to the invention, the top grading ring and the bottom grading ring are arranged outside the external arc extinguish chamber, the electric field of the external arc extinguish chamber can be homogenized, and the top grading ring and the bottom grading ring can be fixed on the side wall of the external arc extinguish chamber due to the existence of the fixed clamping jaw and the fixing mechanism. Therefore, the vibration influence during the switching-on and switching-off operation of the circuit breaker is avoided.

The invention discloses an aging test circuit and system of a vacuum arc-extinguishing chamber comprehensive mode, and relates to the technical field of high-voltage power equipment. The circuit comprises a booster circuit, a rectifier bridge, a voltage divider, a first high-voltage switch, a capacitor tower, a reactor group, an ignition device, a frequency modulation resistor, a frequency modulation capacitor, an auxiliary switch, a second high-voltage switch, a first transformer, a variable-frequency power supply, a detachable vacuum arc-extinguishing chamber and a direct-current measuring resistor. The circuit can adjust the stored energy of the capacitor tower and the voltage of the variable-frequency power supply according to the ablation condition of a contact in the vacuum arc-extinguishing chamber, so as to adjust the magnitude and frequency of the current released by the capacitor tower during an aging test and the magnitude and frequency of the voltage released by the transformer. Therefore, aging energy of large current / or small current / or voltage with different frequencies is applied during an aging test, and the aging energy and the action mode of the energy are ensured to be matched with the current state of the contact by controlling the energy applying mode and the energy applying frequency under different contact opening distances.

According to the preparation method for preparing the CuCr alloy with the high Cr content through the vacuum non-consumable electric arc furnace or the induction melting furnace, through the design concept of microelement alloying, the CuCr alloy can be fully and evenly diffused in the smelting process by adding a trace amount of miscible elements such as Al and Ti; the alloy comprises, by mass, 44%-52% of Cu, 43%-47% of Cr, 2%-8% of Al, 0%-5% of Ti, 0%-2% of Mo and 0%-2% of Nb, and elements with the purity larger than 99.9 wt% serve as raw materials. Compared with an infiltration method, the alloy material prepared by the method disclosed by the invention is more compact in structure, smaller in grain size of the Cr phase and higher in hardness, so that the alloy material has excellent wear resistance and mechanical properties.

The application discloses a high-voltage vacuum arc-extinguishing chamber contact resistance and equivalent thermal analysis method, comprising the following steps: three-dimensional equivalent modeling of the high-voltage vacuum arc-extinguishing chamber; determining the number and position of the contact piece contact points; experimentally measuring the high-voltage vacuum arc-extinguishing chamber loop resistance and calculating the contact radius; establishing a conductive bridge, and obtaining a simulation loop resistance by an electromagnetic simulation software; adjusting the contact radius so that the simulation loop resistance is consistent with the experimental measurement result, and obtaining an adjusted conductive bridge; performing electromagnetic field-thermal field-airflow field two-way coupling simulation analysis based on the high-voltage vacuum arc-extinguishing chamber equivalent model of the adjusted conductive bridge, and obtaining the high-voltage vacuum arc-extinguishing chamber temperature rise distribution. The application can more accurately simulate the current constriction effect on the large-size high-voltage vacuum contact piece and more accurately simulate the high-voltage vacuum contact piece contact resistance.

The invention discloses a method for preparing a Cr2Nb / Cu composite material through vacuum consumable electric arc melting, which specifically comprises the following steps: step 1, carrying out two times of crushing treatment on Cu, Cr and Nb blocks subjected to ultrasonic cleaning, and screening Cu, Cr and Nb particles with different sizes; 2, Cu particles, Cr particles and Nb particles are mixed, and the mixed particles are pressed into a consumable electrode; 3, the consumable electrode is smelted, and the Cr2Nb / Cu composite material is obtained; fourthly, the Cr2Nb / Cu composite material obtained in the third step is machined into the size needed by the consumable electrode, the Cr2Nb / Cu composite material continues to serve as the consumable electrode to be smelted according to the third step, and the process is repeated for 3-6 times; and 5, densifying the alloy obtained in the step 4 by adopting different hot extrusion processes. The method solves the problems of element segregation and coarse Cr2Nb particles in the Cr2Nb / Cu composite material prepared by the existing casting process.

The invention discloses a preparation method of a high-temperature strain gauge grid wire, and the preparation method comprises the steps: carrying out the vacuum arc melting of a super-high-temperature-resistant strain alloy material, rolling into a foil material with uniform radian, and carrying out the heat treatment of the foil material, thereby obtaining a uniform fine-grain structure. And preparing the foil subjected to heat treatment into grid wires by using a femtosecond laser direct writing technology, subsequently performing in-situ real-time monitoring and defect self-correction on the grid wires, and finally performing functional post-treatment and integrated packaging on the grid wires. According to the preparation method of the high-temperature strain gauge grid wire, femtosecond laser is used for replacing traditional mechanical means such as drawing and wire winding to prepare the grid wire, the grid wire is uniform in size, high in precision and good in material performance, and therefore the measurement precision of the grid wire can be guaranteed, and meanwhile the grid wire has long-term reliability in a high-temperature environment; and the preparation process of the grid wire can be integrated on one laser platform, so that the preparation process is simple and efficient, and the production cost is reduced.

The invention relates to the technical field of medium-voltage complete equipment, in particular to a load switch based on vacuum arc extinguishment, which comprises a disconnecting link assembly, a vacuum arc extinguish chamber and a vacuum arc extinguish chamber, and is characterized in that the disconnecting link assembly comprises a disconnecting link moving end and a disconnecting link static end, and the disconnecting link moving end is connected with or disconnected from the disconnecting link static end through driving of an external driving mechanism; the connection and disconnection of the disconnecting link moving end and the disconnecting link static end correspond to the connection and disconnection of a main loop; the vacuum arc-extinguishing chamber is electrically connected with the disconnecting link assembly in parallel; the vacuum arc-extinguishing chamber comprises a static contact and a moving contact, the static contact is connected with the static end of the disconnecting link, and the moving contact is connected with the transmission assembly. The disconnecting link assembly and the vacuum arc-extinguishing chamber are connected in parallel, so that current is transferred to a vacuum arc-extinguishing chamber branch at the initial opening stage, arc extinguishing is completed by utilizing the vacuum arc-extinguishing chamber, the situation that the disconnecting link directly breaks load current is avoided, and the vacuum arc-extinguishing chamber is driven to be opened after an enough safety gap is reached through the matching relation of the disconnecting link assembly and the transmission assembly. And electric arc reignition and breakdown risks caused by insufficient gaps are avoided.

The invention discloses a vacuum self-consuming furnace crystallizer cooling device and a cooling method thereof, and relates to the technical field of vacuum self-consuming furnace cooling, the vacuum self-consuming furnace crystallizer cooling device comprises a crystallizer, a water-cooled jacket arranged on the outer side of the crystallizer in a sleeving mode, an air-cooled jacket, a water inlet pipe connected to the bottom of the water-cooled jacket, and a water outlet pipe connected to the side wall of the water-cooled jacket, the air cooling sleeve is arranged on the outer side of the water cooling sleeve in a sleeving mode and used for conducting air cooling on the water cooling sleeve under the high-power scene of the crystallizer, an air inlet pipe is connected to the bottom of the air cooling sleeve, and an exhaust pipe is connected to the side wall of the air cooling sleeve; and the water flow disturbance assembly is arranged in the water inlet pipe, the water flow disturbance assembly is driven by water flow in the water inlet pipe to operate, and water in the water cooling jacket can be rotationally disturbed when the water flow disturbance assembly operates. The problems of local overheating and poor cooling effect caused by cooling efficiency reduction and laminar flow under the high-power working condition are systematically solved, meanwhile, the risk of vaporization explosion of cooling water is completely eradicated, and safety is improved.

The invention relates to an environment-friendly switch vacuum arc-extinguishing chamber contact temperature monitoring method and system based on surface acoustic wave array sensing and inversion, and belongs to the field of electrical monitoring. In order to solve the problem that in the prior art, non-intrusive and high-reliability monitoring of the contact temperature of the vacuum arc-extinguishing chamber is difficult to realize due to vacuum sealing and metal shielding, the technical scheme of the invention is as follows: an acoustic surface wave sensor array comprising three or more sensing nodes is constructed on the outer wall of the vacuum arc-extinguishing chamber, and the longitudinal temperature gradient distribution of the outer wall is captured in a lossless manner. A narrow-band flat-plate reader antenna is adopted to realize array signal parallel transmission with a high signal-to-noise ratio, and the steady-state temperature of an internal contact is accurately inverted through a pre-trained physical information neural network (PINN) model by utilizing multi-source data fusion and array characteristics. According to the method, a non-intrusive monitoring function from external sensing to internal deduction is realized, the problem that the temperature of the contact cannot be measured in a high-voltage closed environment is solved, and a key technical support is provided for safe operation of environment-friendly switch equipment.

A combined switch device disclosed by the present application comprises a rack, vacuum arc extinguish chambers, isolation contacts, grounding contacts and a contact knife assembly, the rack is formed by splicing a plurality of insulating partition plates, a plurality of isolation cavities are formed in the rack, the vacuum arc extinguish chambers are vertically installed in the corresponding isolation cavities, and the bottom ends of the vacuum arc extinguish chambers are provided with static contacts; the isolation contact is installed at the bottom end of the rack through an insulated isolation cross beam, an isolation area corresponding to the isolation cavity is arranged on the isolation cross beam, the isolation contact is located in the corresponding isolation area, the grounding contact is installed at the bottom end of the rack and corresponds to the isolation cavity, and the contact knife assembly is rotatably installed at the bottom end of the rack through an isolation shaft. The beneficial effects of the invention are that the vacuum arc-extinguishing chambers between phases are physically isolated through the isolation cavities, and the isolation contacts between phases are physically isolated through the isolation regions at the same time, so that the dual isolation design greatly blocks the inter-phase conductive paths in space, i.e., the inter-phase insulation electric field is greatly improved, and the reliability of the vacuum arc-extinguishing chamber is improved. And the insulating property of the combined switch equipment is improved.

The utility model relates to the field of switch contact operating mechanisms, and provides a double-shielding structure, a vacuum arc-extinguishing chamber and a solid insulator, and the double-shielding structure comprises a middle cover plate, an inner shielding net and an outer shielding net. The middle cover plate is connected with a fracture needing to be shielded; the inner shielding net is sleeved on the middle cover plate and is positioned in the fracture; the outer shielding net is sleeved outside the inner shielding net, and the two ends of the outer shielding net are at least sleeved on the outer edges of the two ends of the fracture. And the chamber body can be coated outside the vacuum arc extinguishing chamber in a pouring or assembling manner. By designing the shielding net at the connection point between the insulator and the shielding cover plate, the connection point between the insulator and the cover plate can be shielded, the problem of poor electrical performance of the connection point is eliminated, and the safety and reliability of the vacuum arc-extinguishing chamber are improved.

The application belongs to the technical field of copper wire preparation, and discloses a preparation process of high-strength and high-toughness copper wire. The preparation process comprises the following steps: mixing Ni, Co and Al element powders according to a molar ratio of 0.95-1.05:0.95-1.05:0.95-1.05, and then high-energy ball milling to obtain Ni-Co-Al middle-entropy alloy micro powder, and then vacuum arc melting or discharge plasma sintering to obtain Ni-Co-Al middle-entropy alloy; mixing the Ni-Co-Al middle-entropy alloy with tungsten copper alloy and copper ingot for melting, cooling the molten copper water through a condensing device, drawing out by a traction mechanism, annealing treatment, winding by a rewinding machine after cooling, and obtaining the copper wire. The application takes the copper ingot as a base material, the tungsten copper alloy as a reinforcing phase, and the Ni-Co-Al middle-entropy alloy as a bonding phase, and the copper wire is prepared by conventional mixed melting, so that the application has the advantages of simple processing method and low production cost.

This invention discloses a rare-earth Ce-purified Ti-Mn-based hydrogen storage alloy and its preparation method. The preparation method includes the following steps: mixing FeV80 with Ce and melting it in a vacuum arc melting furnace under an argon protective atmosphere; polishing the surface of the FeV80-yCe master alloy to remove the surface-enriched impurity phases, obtaining a purified master alloy; mixing the purified master alloy with Ti, Zr, Mn, and Cr raw materials and arc melting it under vacuum conditions; after melting, cooling it to room temperature with the furnace to obtain the rare-earth Ce-purified Ti-Mn-based hydrogen storage alloy. This invention pre-treats FeV80 with Ce, and removes impurities enriched on the surface of the metal ingot through melting and then polishing. The process is simple and cost-controllable, fundamentally solving the problem of impurity deterioration in industrial raw materials, improving the hydrogen storage capacity of the hydrogen storage alloy at 5MPa hydrogen pressure, and meeting the comprehensive performance requirements for industrial applications.

The vacuum contact comprises a static end contact and a moving end contact, the static end contact comprises a first transverse magnetic assembly and a first longitudinal magnetic assembly, the first transverse magnetic assembly comprises a first spiral arm contact piece and a first conducting rod, the first longitudinal magnetic assembly is of a hollow structure, and the first longitudinal magnetic assembly is arranged on the peripheral side of the first conducting rod in a sleeving mode; the first radial arm contact blade is fixed at one end of the first conducting rod and is in contact with the first longitudinal magnetic assembly; the moving end contact comprises a second transverse magnetic assembly and a second longitudinal magnetic assembly, the second transverse magnetic assembly comprises a second radial arm contact blade and a second conducting rod, the second radial arm contact blade is fixed at one end of the second conducting rod and is arranged opposite to the first radial arm contact blade, and the second longitudinal magnetic assembly is of a hollow structure and is fixed on the first radial arm contact blade. The second longitudinal magnetic assembly sleeves the peripheral side of the second conductive rod. The advantages of the two magnetic fields are combined to control movement and diffusion of the vacuum arc, and the breaking capacity of the vacuum contact is improved from the aspect of mechanism.

The invention provides a method for preparing a high-purity niobium ingot by utilizing multistage refining and the high-purity niobium ingot, and the method comprises the following steps: (1) taking aluminum particles, niobium pentoxide, a heat generating agent and a slag former as raw materials, preparing an aluminum-niobium alloy ingot by adopting an exothermic method outside a furnace, and then carrying out surface treatment and crushing treatment to obtain aluminum-niobium alloy particles; (2) the aluminum-niobium alloy particles are subjected to horizontal electron beam smelting, and a smelted niobium plate is obtained; (3) stacking a plurality of smelting niobium plates, and then sequentially performing vacuum diffusion welding and vacuum arc smelting to obtain a primary niobium ingot; and (4) the primary niobium ingot is placed in a double-gun electron beam smelting furnace to be smelted, and the high-purity niobium ingot is obtained. The stable production of the high-RRR value high-purity niobium is realized by adopting a multi-stage refining process coupling system of an aluminothermy method, horizontal electron beam melting, diffusion welding, electric arc melting and double-gun electron beam melting, and the technical problems of high energy consumption, high cost, low production efficiency and the like in the traditional process are effectively solved.

The application provides a generator circuit breaker control system and method based on a stroke curve, which is built by using an electromagnetic repulsion mechanism, a laser displacement sensor, a vacuum arc-extinguishing chamber, a drive circuit, a controller, a transfer capacitor branch and a small-capacity circuit breaker S1, stroke data of a main branch circuit breaker is collected in real time, and a circuit breaker stroke curve model is established. When a short-circuit fault occurs at a generator outlet side, the action time of the circuit breaker is predicted according to the stroke curve of the main branch circuit breaker, and the opening time is optimized through a correction algorithm, so that the fast and accurate control of the generator circuit breaker is realized. The application mainly solves the problem that the existing control method is too dependent on a complex short-circuit current calculation expression, provides a generator circuit breaker control method with small interference and strong universality, and fills the technical blank in the field of generator outlet side circuit control.