47results about How to "No arc" patented technology

The invention discloses a commutation circuit based on priorities, which comprises a plurality of switch units, wherein each switch unit has a preset priority different from that of other switch units. Each switch unit comprises a switch tube connected between one of a plurality of power supplies and a power bus in series, connected with an external control device and used for receiving a controlsignal from the external control device so as to control the switching-on and the switching-off of the switch tubes, wherein the power supplies and the switch units are in one-to-one correspondence. Priority control lines are led out between the switch tubes of the switch units with relatively higher priorities in the switch units and the power bus and connected to the position of the switch tubeof each switch unit with relatively lower priority.

The invention belongs to welding methods, and particularly relates to a friction stir welding method for a lock bottom circular seam of a carrier rocket storage tank. The method comprises the following steps that firstly, welded parts are transformed, welding leakage grooves are formed in a tank bottom fork-shaped ring, and the welding leakage grooves are formed in the bottommost portion of a tank bottom fork-shaped circular welding seam; secondly, the welded parts are in lap joint, and the welded tank bottom fork-shaped ring is in lap joint with a short shell to form the welding joint; thirdly, welding is carried out, and welding is carried out along the welding joint through the friction stir welding manner. The method has the obvious advantages that nearly defect-free welding can be achieved, the consistency and stability of the mechanical property of the joint are obviously improved, and compared with a fusion welding lock bottom joint, the performance of the lock bottom circular seam is improved by about 20 percent to 30 percent.

The invention relates to an intelligent and commutation type three-phase current imbalance automatic adjusting device. The device comprises a main controller, a phase converter, a first current transformer and an anti-power-off electrical appliance element combination; the main controller is a control terminal and is electrically connected with an outgoing line side bus of a distribution transformer; and the phase converter is an execution terminal and is electrically connected with a user line and a user load of a three-phase branch through the anti-power-off electric appliance element combination. Relay current zero-crossing cutting and voltage zero-crossing input technologies are adopted, so that it is guaranteed that no arc exists at the moment of cutting and no inrush current exists at the moment of input, the service life of a relay is prolonged, and the operation reliability of the relay is improved; and a magnetic latching relay with a switching state feedback signal output endis adopted, so that the problem of interphase short circuit caused by improper execution of a switching action of the magnetic latching relay is avoided.

The invention relates to a method for constructing an upper conduit frame of a six-pile conduit frame. The construction method comprises the steps of first segmenting the upper conduit frame: dividing the conduit frame into seven segments in total, wherein a main barrel is independently a segment and is marked as D01, with a weight of 157 tons; inclined strut steel pipes, horizontal supporting steel pipes and pile sleeves form six L-shaped segments, correspond to steel pipe pile, and are sequentially marked as G01, G02, G03, G04, G05 and G06, and the single segment weighs 59 tons. The construction method comprises the steps that steel plates are inspected after arriving; and according to a jacking diagram, the steel plates are subjected to blanking, lineration and groove cutting, steel plate machining edge rolling, cylinder splicing, assembly welding, jig frame manufacture, segmenting pre-folding, segmented handing over for examination and segmented coating. The method has the advantages that horizontal type pre-assembly is performed; by segmented manufacture of the main barrel and a supporting pipe, the inclined strut steel pipes are divided into two segments to be pre-assembled, finally the size of each segment is determined, and the precision is high; vertical type folding is performed, and the method facilitates final assembly.

The invention provides a miniature circuit breaker control device. Through movement of a sliding block on a screw rod, a switch-off driving mechanism and a switch-on driving mechanism are respectively driven to complete switch-off and switch-on operations on a circuit breaker; after the switch-off and switch-on operations are completed, the sliding block returns to an original position, and a transmission relation with the switch-off driving mechanism or the switch-on driving mechanism is disconnected; since the transmission relation is disconnected, an internal part of the miniature circuit breaker control device cannot stop the action of a switch-off and switch-on mechanism of the miniature circuit breaker any longer, thus, a handle of the miniature circuit breaker still can be manually operated to achieve switch-off and switch-on after the switch-off and switch-on operations of the miniature circuit breaker are controlled. With the miniature circuit breaker control device provided by the invention, the manual switch-off and switch-on still can be fulfilled on the condition of a fault occurs in the miniature circuit breaker control device without affecting original manual control of the miniature circuit breaker, and the safety performance is improved. Moreover, the invention also provides a method applying the above miniature circuit breaker control device to control the miniature circuit breaker.

The invention discloses an electric automobile charge system. The system is provided with multiple charge output interfaces, and comprises a charge unit and at least one switching unit connected with the output port of the charge unit, wherein each switching unit comprises one or more switch units, each switch unit comprises a first semiconductor switch or a second semiconductor switch and a third semiconductor switch which are successively connected, and each switch unit is used for switching on and switching off to switch power output between the charge unit and the multipath charge output interfaces according to charge states of electric automobiles connected with the switch unit. The electric automobile charge system provided by the invention has the following steps: the switch units composed of the semiconductor switches are installed at the anode and/or cathode output port of each power supply module, through controlling the conduction or disconnection of the semiconductor switches, the power output between the power supply modules and the multiple charge output interfaces can be flexibly distributed, the system cost is low, and the occupied space is small.

The invention relates to a 2205 dual-phase automatic welding method. The method includes the steps that longitudinal seams and circular seams of a tube body are welded by adopting a PAW/TIG dual-gun switching longitudinal seam automatic welding system and a PAW/TIG dual-gun switching circular seam automatic welding system. When the slag thickness of the 2205 dual-phase stainless steel tube body is4-10 mm, an I-shaped groove type is adopted, a groove is planned to be a straight edge in a straight-edge butt-jointing mode, and automatic PAW is used for self fusion welding without filler wires once and then is switched to automatic argon arc welding for covering with the filler wires once; and when the slab thickness of the 2205 dual-phase stainless steel tube body is 10-15 mm, a Y-shaped joint groove type is adopted, the groove angle is 75 degrees, the unilateral is 37.5 degrees, the truncated edge is 6 mm, and the automatic PAW is used for self fusion welding without the filler wires once, and then is switched to automatic GTAW for covering with the filler wires 2-4 times until full welding. According to the 2205 dual-phase automatic welding method, back gouging is not needed, automatic welding is achieved, the welding production efficiency is high, no spatter, powder, arc light, and noise exist in the welding process, shapes of welding lines are neat and beautiful, and the quality of whole equipment is improved.

The invention relates to a test object cabinet for testing anticipated short-circuit current of an SPD (surge protection device). The test object cabinet has an airtight, visual and closed structure capable of discharging smoke dust and disconnecting power supply after being opened. A movable organic glass observation cover is mounted on a test bench surface to facilitate observation and operation; a centrifugal exhaust fan is connected with an air inlet on the test bench surface and an air outlet on the cabinet wall; and the centrifugal exhaust fan can promptly exhaust smoke dust generated by burning the test object. The test object cabinet with the closed structure can effectively protect the personal safety of test personnel in case of an accident.

The present invention provides an AC-DC dual-purpose high-power electric water heater. The AC-DC dual-purpose high-power electric water heater is composed of two portions including an electric water heater basic device and a control device. The electric water heater has the structure that a water heater inner container and an inner container seal cover are disposed in a cylindrical heat insulation electric water heater housing, an electric heating pipe, a temperature controller and a snap action temperature limiter are disposed in the inner container, a lower part of the housing is provided with a water inlet, a water outlet and a sewage draining exit, and the front side of the water heater housing is provided with a heating indicating lamp and a temperature display. The control device is installed between the inside of a side cover of the water heater and the inner container seal cover, the snap action temperature limiter, the temperature controller, a DC operation relay and a filtering rectifier are disposed in the control device, on and off of the electric heating pipe are controlled by the DC operation relay, and a power line stretches out of the cylindrical housing and is electrically connected with a power plug. The electric water heater is AC-DC dual-purpose, and on and off of the electric heating pipe are controlled by the DC operation relay without arc discharge. The electric water heater is suitable for office and household use, and especially suitable for DC photovoltaic power generation household use.

The invention discloses an efficient electricity-saving appliance of an intelligent three-phase electric motor and relates to the technical field of control devices of alternating-current electric motors. The efficient electricity-saving appliance comprises a power adjusting unit, a voltage sampling unit, a zero-detection unit, a sawtooth wave forming unit, a power adjusting signal synthesis unit, a square-wave oscillator, a phase demodulation unit, a first current sampling unit, a changeover switch, a second current sampling unit, a soft starting unit, an overload protection unit, a phase loss protection unit, a startup and shutdown soft parking unit and a starting and opening changeover unit. The efficient electricity-saving appliance can dynamically adjust power input into the electric motor with change of electric motor loading capacity, ensures that the electric motor operates at the optimum load rate, reduces reactive loss of the electric motor, remarkably improves the actual operating efficiency of the electric motor and achieves the electricity-saving purpose.

The invention provides a converter device for an electrified railway ground automatic neutral section system. The topological structure of the device comprises a high voltage pre-charging unit, an MMCrectifying unit, an intermediate direct current isolation conversion unit and an MMC inverter conversion unit. The MMC rectifying unit and the MMC inverter conversion unit comprises left and right bridge arms respectively. Each bridge arm is composed of symmetrical upper and lower half bridges, and the upper and lower half bridges comprise a reactor and n power modules connected in series respectively. The intermediate direct current isolation conversion unit is composed of m direct current isolation conversion modules DCM directly connected in series on the direct current side. The device provided by the invention realizes converting for the power supply of the neutral section of the electrical sectioning of a contact network, so that a train can pass through the electrical sectioning without power off.

The invention discloses a series battery pack management and control method based on an automatic battery switching control system. The system comprises a switching control unit, a battery access unit, a standby battery access unit, a voltage detection unit, a temperature detection unit, wherein the battery access unit consists of a plurality of basic battery access nodes which are connected in series, the standby battery access unit is composed of a plurality of standby battery access nodes which are connected in series, the voltage detection unit is used for detecting a voltage of a single battery accessed to each battery access node, the temperature detection unit is used for detecting the temperature of a single battery accessed to each battery access node, when one or more batteries in the battery pack are abnormal, faulty batteries can be immediately removed from the battery pack, the standby batteries are connected into the battery pack, and the switching process can be carriedout online in the discharging or charging process of the battery pack without stopping charging and discharging. The control system is advantaged in that the control system provided by the invention can be widely applied to the battery pack, effectively guarantees use safety of the battery, enhances redundancy capability, and prevents the condition that the whole battery pack cannot be used due tofailure of a single battery.

The invention discloses a load-bearing adjustable stepless voltage regulating transformer, which belongs to the electrical engineering technical field and is characterized in that the iron core of the transformer comprises a main iron core shaped as the Chinese character <ri> and a cylindrical rotating iron core; the main iron core comprises three iron core columns A, B, C; a cylindrical hollow cavity is arranged inside the iron core column B, and the rotating iron core can be placed and rotated in the hollow cavity; a rotating shaft bracket is made of non-ferromagnetic material, and the rotating shaft of the rotating iron core is arranged at the center of the rotating shaft bracket; the rotating shaft is connected with a transmission mechanism and then driven by a motor; the rotation of the motor is controlled by the output voltage; a primary side winding and a secondary side winding are wound on the iron core column A; another secondary side winding is wound on the iron core column B or C; and the two secondary side windings are positively connected in series to serve as the output end of the transformer. When the rotating iron core rotates, the rotating iron core can load and continuously change the output voltage and can freely set a plurality of stable output voltage value; the transformer causes no electric arc and harmonic when in work and has no thyristor and other electronic elements, so the transformer achieves good reliability and low failure rate; besides, the transformer has simple structure, low manufacturing cost and low maintenance cost.

The invention relates to a dynamic voltage compensation device for an AC/DC hybrid power distribution network and a control method thereof. The device comprises an A-phase rectification transformation module, a B-phase rectification transformation module and a C-phase rectification transformation module which are electrically connected with one another; each of the A-phase rectification transformation module, the B-phase rectification transformation module and the C-phase rectification transformation module comprises: a high-voltage input side electrical wiring terminal, an electric reactor, a plurality of power units of which the input sides are connected in series and a plurality of isolation transformers of which the primary sides are electrically connected with the output sides of the power units respectively; the power units at the tail ends of the A-phase rectification transformation module, the B-phase rectification transformation module and the C-phase rectification transformation module are electrically connected with one another, and the isolation transformers at the tail ends are electrically connected with one another; the input side outgoing line terminals of the power units at the tail ends are short-circuited together to form a high-voltage neutral point N; and the direct current bus leading-out terminal of one power unit at the tail end is used as a low-voltage direct current output side negative wiring terminal and a low-voltage direct current output side positive wiring terminal.