38results about How to "Improve commutation efficiency" patented technology

A switching device (1) for low or medium voltage electric power distribution networks, said switching device comprising: - at least an electric pole (2) comprising a movable contact (4) and a fixed contact (5), which are coupleable/decoupleable one to another; - a circuit assembly (6), which comprises a chain (60) of semiconductor devices (601, 602, 603, 604, 605, 606) adapted to switch in an ON state or in an OFF state depending on the voltage applied thereto, said semiconductor devices being electrically connected in series one to another in such a way that a current can flow according to apredefined conduction direction (CD) when said semiconductor devices are in an ON state. The circuit assembly (6) comprises an input terminal (61), an output terminal (62) and at least an intermediateterminal (63) electrically connected with at least an intermediate electric node (64) positioned between two subsequent semiconductor devices (602, 603, 604, 605). The input terminal (61) is electrically connected with said fixed contact: The input terminal (61), the output terminal (62) and the at least an intermediate terminal (63) are electrically coupleable/decoupleable with/from said movablecontact (4) when said movable contact reaches different positions (P1, P2, P3, P4) during a movement towards/away from said fixed contact (5) in such a way that different groups (611, 612) of semiconductor devices switch in an ON state or in an OFF state at different instants (t2, t3, t4, t6, t7, t8) during the movement of said movable contact, depending on the position reached by said movable contact.

The invention provides a hydraulic reversing valve and a hydraulic reversing device, and relates to the technical field of reversing valves. The hydraulic reversing device comprises a valve body, a valve sleeve and a valve element. The valve body is provided with a first installing cavity and further comprises a pressure oil port, an oil return port, a first work port and a second work port whichcommunicate with the first installing cavity, and the valve sleeve is arranged in the first installing cavity. The valve sleeve is provided with a second installing cavity, the valve sleeve is provided with a plurality of oil grooves in the circumferential direction, and the multiple oil grooves are provided with liquid passing holes communicating with the second installing cavity. The valve element comprises a first liquid passing groove and a second liquid passing groove which are distributed in the axial direction, and the valve element is rotationally arranged in the second installing cavity. The hydraulic reversing valve can meet the usage requirements for the high reversing frequency and high work pressure of execution mechanisms of some devices through combination of the valve body,the valve sleeve and the valve element, cooperation of the liquid passing grooves and the liquid passing holes in the oil grooves and gap seal between the valve element and the valve sleeve. The hydraulic reversing device is formed by the hydraulic reversing valve and a drive mechanism, and the usage requirements can be met as well.

The invention relates to the technical field of power supply and distribution devices, and discloses a three-phase imbalance automatic commutation system. Current information of each phase of a three-phase branch in a power grid system is collected through a collection module, a main control module obtains the three-phase unbalance degree of the system according to the current information, and when the three-phase unbalance degree is larger than a preset threshold value, it is judged that phase change processing needs to be carried out. And the main control module compares the circuit information of each phase to judge an overload phase in the three phases. A current zero-crossing detection module detects a current zero-crossing point of three phases, and the main control module outputs acorresponding commutation control signal when the current of an overload phase crosses zero. And an automatic commutation module completes an automatic commutation process according to the commutationcontrol signal. By means of the three-phase imbalance automatic commutation system, an operator can complete automatic commutation under the condition that the tail end load is not powered off, the problem of three-phase imbalance of the tail end load is fundamentally solved, the tedious process of manual commutation is avoided, and the commutation efficiency and the power supply reliability of the system are greatly improved.

The invention discloses a high-efficiency heat accumulation type tube heating furnace system and relates to the technical field of tube heating furnaces, energy conservation and emission reduction. The high-efficiency heat accumulation type tube heating furnace system is provided for solving the problems that an existing tube heating furnace is low in thermal efficiency, short in service life, poor in stability and high in system investment. The high-efficiency heat accumulation type tube heating furnace system comprises a tube furnace body, a burner nozzle, heat accumulation chambers, four-way reversing valves, an air blower, induced draft fans, air distribution valves, flame detectors and other devices. The air blower periodically blows combustion air into the left heat accumulation chamber and the right heat accumulation chamber at indoor temperature correspondingly and conducts heat exchange with the corresponding heat accumulation chambers to heat combustion air to 300 DEG C or above. Tail gas periodically passes through the heat accumulation chambers correspondingly and conducts heat exchange with the corresponding heat accumulation chambers, then the temperature of the tailgas is gradually reduced to about 130 DEG C, and then the tail gas is discharged through the induced draft fans. The air and the tail gas are periodically exchanged in the left and right heat accumulation chambers correspondingly to achieve high-efficiency and stable burning. Meanwhile, a traditional convection section is omitted, the exhaust gas temperature is reduced, and the thermal efficiencyis improved. Accordingly, the comprehensive investment of the tube furnace is minimized, and the service life of the tube furnace is prolonged.

The invention aims at providing a switching type phase sequence switching combined conjunction box, and relates to the power field. The switching type phase sequence switching combined conjunction boxcomprises a conjunction box body, a box cover, a wiring board arranged in the conjunction box body and provided with three voltage and current wiring blocks, and a phase sequence switching switch electrically connected to the first and third voltage and current wiring blocks. Each of the first and third voltage and current wiring blocks comprises an electrical connection assembly and a switchingassembly; the electrical connection assembly comprises a voltage electrical connection column and middle, left and right current electrical connection columns; the switching assembly comprises a voltage switching terminal and left and right current switching terminals; and the middle electrical connection column is electrically connected with the right/left current electrical connection column. When being used for phase sequence adjustment, the switching type phase sequence switching combined conjunction box does not influence power utilization of users, and is higher in phase switching efficiency and higher in safety level.

The invention discloses an upper rotary reversing device of a log processing production line, which is arranged between a first conveying line and a second conveying line with a certain included angle, and comprises a rotary reversing rod and a double-roller conveying mechanism; the double-roller conveying mechanism is located beside an output end of the first conveying line and comprises a first roller and a second roller which are arranged in parallel; the first roller and the second roller are driven by different conveying motors to rotate; the second conveying line is located directly below the interval between the first roller and the second roller; the rotary reversing rod is arranged above the position between the first roller and the second roller; and the bottom of the rotary reversing rod is provided with a space allowing logs to penetrate through, and the rotary reversing rod is driven by a reversing motor to rotate so as to drive the logs to steer. The upper rotary reversing device of the log processing production line provided by the invention is compact in structure, reliable in reversing and high in production efficiency, and meanwhile conveying equipment is effectively combined.

The invention discloses a forward and reverse switching device and a forward and reverse switching method thereof, and relates to the field of vehicle transmission equipment. The forward and reverse switching device comprises a first transmission mechanism and a second transmission mechanism; the first transmission mechanism comprises a first rotating shaft, a first gear, a second gear, a third gear and a first friction driver; the third gear is connected to the first rotating shaft through the first friction driver; the second transmission mechanism comprises a second rotating shaft, a fourth gear, a fifth gear, a sixth gear and a second friction driver; the sixth gear is connected to the second rotating shaft through the second friction driver; the first gear is externally meshed with the fourth gear; and the second gear is externally meshed with the fifth gear through an idle gear. According to the forward and reverse switching device and the forward and reverse switching method thereof, the first transmission mechanism or the second transmission mechanism is selected to carry out rotary transmission through switching between the combined state and the separated state of two clutches, transmission gears are in an engaged state in the whole switching process, forward and reverse switching can be carried out in a non-stop state, and the forward and reverse switching efficiency is improved.

The invention discloses a marine high-power gear box clutch capable of achieving rapid row connection and rapid reversing. An oil cylinder body is included. A piston is arranged in the oil cylinder body. The piston is connected with a guide ring seat sleeve and the oil cylinder body through an inner hole and an outer ring. The guide ring seat sleeve is fixed on the oil cylinder body through a bolt. Four oil drain valve assemblies are arranged at a top of an outer circle of the oil cylinder body. A gasket is arranged between the piston and the guide ring seat sleeve, a belleville spring is arranged in the piston, and the belleville spring is placed on a spring seat sleeve. Advantages that rapid row connection and reversing are achieved; clutch universality is high; an existing gear box canbe transformed; a price is low; and generalizability is high and so on are possessed.

The invention discloses an intelligent lockset with a reversing handle and a reversing method of the intelligent lockset. The intelligent lockset comprises a first lock case and the handle rotatably arranged on the first lock case, an accommodating groove is formed in the first lock case, a fixed plate fixedly connected with the first lock case is arranged at an opening of the accommodating groove, a rotating piece fixedly connected with the handle in the circumferential direction is arranged in the accommodating groove, and a torsional spring is arranged between the rotating piece and the fixed plate. The torsional spring is provided with a first extension column and a second extension column, a first protruding block and a second protruding block correspond to the first extension columnand the second extension column on the same side respectively are symmetrically arranged on the end surface, facing the fixed plate, of the rotating piece, and a first connecting column and a second connecting column are symmetrically arranged on the outer end surface of the fixed plate, wherein part of the first connecting column and part of the second connecting column are inserted into the accommodating groove and the first connecting column and the second connecting column are distributed on the periphery of the rotating piece. According to the intelligent lockset with the reversing handle, the handle reversing mode is simplified, the installation is convenient for users, the handle reversing efficiency is improved, suitable crowds are wide, and the product stability and product valuedegree are high.