37results about How to "Reduce arc voltage" patented technology

An arc welding system including an electric circuit including a power source, a welding torch with a consumable welding wire, a workpiece and a control system including a computer, memory and elements for tuning the arc welding system.

In a lamp operation controller and a method thereof, for obtaining a stable light emission, simply and certainly, without necessity of detection of a parameter accompanying discharge, the lamp operation controller, for operating a discharge lamp having a pair of electrodes, which are disposed at both ends of a light emission tube to have a predetermined distance therebetween, converts electric power of an electric power source 1, through an inverter, into alternating voltage and alternating current, changing the polarity thereof continuously and alternately, so as to produce operating current, and apply that across the pair of the electrodes of the discharge lamp, thereby letting the lamp to emit a light. A driver circuit provides a pulse at a trailing edge of the lamp current or the lamp voltage to be supplied when the discharge lamp emits the light, and also determine amplitude of the pulse, in accordance with fluctuation on the lamp voltage (VL) with respect to lighting time of the discharge lamp, which is measured in advance.

A method for controlling striations in a lamp powered by an electronic ballast includes the steps of generating an asymmetric lamp current using an unbalanced circuit component in the electronic ballast and supplying that current to the lamp. The unbalanced circuit component may be an unbalanced output transformer or an unbalanced DC choke. The output transformer is unbalanced by offsetting the number of turns on each side of the tap on the primary winding of the transformer. In a similar manner, the DC choke is unbalanced by offsetting the number of turns in each winding of the choke.

The invention discloses a method for preparing difficult-to-harden potassium titanate with low hygroscopicity and high bulk density. The method is mainly characterized in that: a titanium source is compounded with a potassium source under calcination condition by auxiliary agents and the like, so that the surface condition and structure of the product potassium titanate are improved, and the product potassium titanate is difficult to harden, has the low hygroscopicity, the high bulk density, high flowability and high dispersibility and is particularly suitable for producing flux cored wires.

The invention belongs to a vacuum circuit breaker field and especially relates to a disc-type overlapping gyromagnetic longitudinal blowing vacuum arc extinguish chamber. The vacuum arc extinguish chamber comprises: a conducting rod (1), a contact cup (5), an iron core (7) and an electrode (4) which is connected to the contact cup (5). The contact cup (5) is fixedly matched with the conducting rod (1). The iron core (7) is placed in the contact cup (5). The contact cup (5) is provided with a plurality of circulation side slots with equal intervals. The iron core (7) is provided with the winding slots (6) with the equal intervals. More than two groups of the coaxial coil windings (8) are stacked into the winding slots (6) and the coaxial coil windings are staggered with a certain angle theta successively. According to the invention, through a strong force of a rotating magnetic field and simultaneously under an effect of a vertical magnetic field, an arc voltage can be reduced; arc columns are impelled to be uniformly distributed on an anode surface; arc energy release can be accelerated; a breaking capacity of the vacuum circuit breaker can be increased.

The present invention relates to a high-voltage vacuum circuit-breaker. It is composed of upper wiring flange, lower wiring flange, arc extinguishing unit, frame, supporting frame and control box. The frame is fixedly mounted on the supporting frame, the three-phase arc extinguishing unit is fixedly mounted on the frame, all the movable components of said arc extinguishing unit are mechanically connected on the spring mechanism in the control box, the arc extinguishing unit is characterized by that in its arc extinguishing chamber a vacuum tube is mounted, and its movable contact and static contact are mounted in the vacuum tube.

The invention relates to the field of environment protection, and discloses a purifying device which comprises a fluidized bed. The fluidized bed comprises a hollow reaction pipe, a gas inlet and a gas outlet, wherein the gas inlet and the gas outlet are formed in the two ends of the reaction pipe. Biomass conductive carbon particles are arranged in the reaction pipe and can be in a fluidized state under the effect of gas flow. The purifying device further comprises a high-voltage electrode and a low-voltage electrode which are arranged on the two sides of the fluidized bed. Organic pollutantgas enters the reaction pipe, the potential difference is formed between the high-voltage electrode and the low-voltage electrode, the biomass conductive carbon particles in the fluidized state are broken down to form discharging, and the organic pollutant gas is degraded. By means of the purifying device, energy consumption can be reduced, and the organic pollutant gas degradation capacity can beimproved.

The invention discloses a magnesium alloy micro-arc oxidation blackness ceramic membrane and a preparation method thereof. The preparation method comprises the steps: a magnesium alloy is polished through SiC abrasive paper, then subjected to deoiling washing, blow-dried through an electric air blower, and placed into a drier for standby application; and the magnesium alloy serves as an anode, a stainless steel sheet serves as a cathode, the pretreated magnesium alloy is soaked in an electrolyte, the magnesium alloy is subjected to micro-arc oxidation in a bipolar pulse constant current mode,then taken out to be washed through deionized water and dried, and then the black ceramic membrane is obtained. Under the condition that electric parameters are not changed, a membrane forming promoter, namely carbohydrazide is added into the electrolyte, the arcing voltage is lowered, the membrane layer quality is improved, thus the membrane layer corrosion resisting property is good, the black ceramic membrane has the small blackness value, even color and firmer membrane-based combination, and the advantages that the prepared membrane layer quality is high, the preparation efficiency is high, and unit energy consumption is low are achieved.

The invention relates to a vacuum switch contact, comprising an electric conduction assembly and a magnetic conduction assembly which extend along the same direction and are in abuttal joint with each other, making up the main body of the contact; wherein, the cross section of the magnetic conduction assembly is divided into a first section and a second section by a bit line of the magnetic conduction assembly, and the area of the first section is larger than that of the second section. Since one end of the vacuum switch contact is big and the other end is small, the magnetic field generated by the magnetic conduction assembly can flow into the main body of another contact because of the small space between the main bodies of the two contacts, thus providing a longitudinal magnetic field which can extinguish arc. The vacuum switch contact can reduce restrike possibility at the time of voltage disjunction, reduce arc voltage, and realize arc extinguishing and satisfy the requirement of high voltage disjunction.

The invention relates to the technical field of aluminum-lithium alloy surface treatment, and discloses an aluminum-lithium alloy micro-arc oxidation method and an electrolyte adopted by the same. Thealuminum-lithium alloy micro-arc oxidation method comprises three steps of pretreatment, micro-arc oxidation and aftertreatment. The adopted electrolyte comprises solute and a solvent, and comprisesthe following components including 10-20 g/L of sodium silicate, 6-10 g/L of strong base, 3-5 g/L of sodium tungstate and 0.5-1 g/L of an additive, and deionized water is used as the solvent. According to the aluminum-lithium alloy micro-arc oxidation method and the electrolyte, the content of the alkaline solute is increased, micro-arc oxidation is promoted to quickly form a film, and the time required by processing is shortened. The solution is good in stability, high in repeated utilization rate and low in cost of used raw materials, a film layer with a certain thickness and corrosion resistance can be prepared within a short time, after 600-hour complete soaking corrosion, the surface film layer is still complete, and an alloy matrix is kept intact; and an electrochemical test shows that the corrosion current density can be reduced by nearly two orders of magnitudes.

The invention discloses a vacuum switch with a vacuum arc-extinguishing chamber. The vacuum switch comprises insulating housings which are internally provided with an intermediate shielding cover. Furthermore the intermediate shielding cover is internally provided with a corrugated pipe protecting cover. The corrugated pipe protecting cover is internally provided with a corrugated pipe. Furthermore the corrugated pipe is internally provided with a dynamic conductive rod. One end of the dynamic conductive rod is provided with a moving contact, and furthermore one side of the moving contact is provided with a static contact. One end of the static contact is connected with a static conductive rod. A static grading shield is arranged outside the static contact. The insulating housings are connected with each other through an intermediate sealing ring. According to the vacuum switch with the vacuum arc-extinguishing chamber, arc is extinguished in a sealed container, thereby realizing no leakage of arc and hot gases; small clearance between 1mm and 40mm is realized between the static contact and the moving contact; and furthermore the vacuum switch with the vacuum arc-extinguishing chamber has advantages of short arc combustion time, low arc voltage, low arc energy, low contact wearing, large number of allowed on-and-off times, small inertia of the dynamic conductive rod, high suitability for high-frequency operation, small size of the operating mechanism, small size of the vacuum switch, small weight and low control power.

The present invention discloses a magnetization, decompression and cooling arc extinction line returning device of a coal mine well ventilator electric power case. The device comprises a fixed connection groove, a magnetization arc extinction device, a controller and an operation key. The fixed connection groove is inlaid and installed at the left end face of the magnetization arc extinction device. The air bag and a negative pressure cavity form a low pressure to allow an actuation block to be pasted to the surface of the electric power case for isolation from air and avoid that a lot of airpromotes arc recrudescence, the action force of a magnetic patch to arc electrons is employed to allow the arc to be close to an arc-shaped blocking plate gate, because a steel bar gate has a ferromagnetic feature to effectively absorb the arc and allow the arc to be stayed in a slit of an aperture and a laminated barb so as to reduce the arc voltage, a heat conductive pad and a condensation cavity are employed to absorb heat, the deformation of a balance rotation needle is employed to promote transmission of heat, The condensation and liquidation of distilled water in a water storage cavity are performed to consume and release the heat to reduce the arc temperature, prevent electrons from thermal ionization and allow the arc to be extinguished.

The present invention relates to a vacuum switch tube, which includes a first contact and a second contact disposed on conductive rods respectively. The two contacts are disposed facing each other. The two contacts are cylinders and include conductive members and magnetic members to form contact bodies. The cross section shape of the magnetic members is divided by a neutrality line into two unequal regions. The magnetic member of the first contact and the conductive member of the second contact are disposed corresponding to each other. The conductive member of the first contact and the magnetic member of the second contact are disposed corresponding to each other. The two vacuum switch contacts are anti-symmetrically disposed, such that a rotating magnetic field having rotating lines of magnetic force is formed, so that re-ignition possibility during voltage breaking is effectively reduced, and an arc voltage is decreased.

The invention discloses a preparing method of a compound tungsten electrode material. The preparing method comprises the following steps of selection of oxides, prereduction, hydrogen gas reduction, high-energy mixing, forming and middle-frequency induction sintering. According to the preparing method of the compound tungsten electrode material, single-crystal ammonium paratungstate is subjected to clearance-type reduction to prepare blue tungsten oxide with a specific phase component, blue tungsten oxide is reduced to generate like-spherical tungsten powder, and the tungsten powder and one ormore of submicron-order oxides of cerium oxide, lanthanum oxide, yttrium oxide, zirconium oxide and the like are efficiently mixed in a high-energy powder mixing machine of a specific structure and subjected to isostatic compaction and low-temperature long-time middle-frequency induction solid-phase sintering; second-phase grains of obtained tungsten bars are fine and uniform, and the tungsten bars are free of segregation, high in rare earth retention rate and good in processing performance; the finished product rate reaches 87% or above, and the processing cost is reduced by 20% or above. Anexisting conventional technology is adopted for the tungsten bars for press working and machining, the finished product rate is high, and the compound tungsten electrode material which is low in arcing voltage, good in arc stability, low in burn-out rate, long in service life and environmentally friendly is obtained.