70results about How to "Reduce the difficulty of design and manufacture" patented technology

The invention discloses a circuit topology structure suitable for bidirectional near-field power transmission, which comprises a full-bridge inverter, a primary-side resonant dynamic compensation network, a primary-side coil, a secondary-side coil, a secondary-side resonant dynamic compensation network, a full-bridge synchronous rectification and a load. The invention can realize bidirectional near-field transmission of electric energy, and at different coil coupling coefficients, at different load size and due to temperature, under the condition of system parameter change caused by manufacturing error of device, by adjusting the PWM duty cycle of the capacitor switching switch, the equivalent capacitance of the capacitor switching switch can change continuously to compensate the resonantnetwork dynamically, so as to realize the soft switching of the full-bridge inverter, to minimize the reactive power in the energy transmission of the system, and to maximize the energy transmission efficiency of the system. In addition, due to the symmetry of the circuit structure, it can realize the bidirectional transmission of near-field electric energy, that is, the bidirectional energy flowbetween the power grid and the load, which improves the utilization rate of the system in the smart grid.

The invention relates to a test bed and a method for testing the high-frequency mechanical characteristic of a tire. The test bed comprises a simulation road surface rack assembly composed of a bottom plate, a lower box body, a shaft base and an upper box body, a simulation road surface assembly composed of a high-rigidity drum, a main shaft, a driven belt pulley, a synchronous belt pulley, a speed measuring assembly and road surface protruding blocks, a drive mechanism assembly composed of a motor base, a motor plate, a servo motor, a drive belt pulley and an air blower, a transmission toothed belt, a wheel cover, a tire positioning assembly composed of a positioning support and an installing plate assembly, and a tire inflating and deflating mechanism assembly composed of an air pipe, a tire pressure control valve and an air pump, and the transmission toothed belt and the wheel cover are arranged between the drive belt pulley and the driven belt pulley. The test method comprises the steps that a deflated tire is installed on the positioning support and pressed on the outer surface of the high-rigidity drum, the tire is inflated to be vertically loaded, and the different road surface protruding blocks are installed on the high-rigidity drum to carry out the test and collect data. The test bed and the method are suitable for testing and modeling of the high-frequency mechanical characteristic of the tire.

A control method based on a linear servo motor comprises the following steps: 1, according to the requirement of an electromagnetic catapult for a driving linear motor, performing design on an overall structure of the linear motor; 2, establishing an air-gap field analytic model and a thrust model of an iron core-free permanent magnetic linear synchronous motor; 3, establishing a mathematical model of the linear motor under autonomous decentralized control; and 4, performing autonomous decentralization on controlled magnetic-motive force. The control method has the advantages that the efficiency of the linear motor is improved and the design and manufacture difficulty of the motor is lowered.

The invention discloses an icebreaking device for navigation and a using method thereof. The icebreaking device comprises a supporting plate and an icebreaking cutter plate; the supporting plate is fixedly welded to the front end of an icebreaking hull, the supporting plate is fixedly provided with a hydraulic cylinder by bolts, a first mounting plate is installed at the telescopic end of the hydraulic cylinder by bolts, ejector rods are fixedly welded to the first mounting plate, and a second mounting plate is movably connected to the ejector rods in a sleeving mode; and cutter heads are fixed at the edge of the icebreaking cutter plate, the icebreaking cutter plate is fixed on an output shaft of a motor in a pin joint mode, and the motor is mounted at the bottom of the second mounting plate through a motor bracket. The icebreaking cutter plate is driven by the double-shaft motor to cut the ice surface and destroy the ice surface structure when the icebreaking hull advances, then thecut ice surface is hit by a reinforcing plate, and crushing of the whole ice surface is facilitated; and the second mounting plate can be moved up and down through springs, a certain cushioning property is obtained, the icebreaking cuter plate is prevented from getting stuck, and improvement of the icebreaking efficiency is facilitated.

The invention discloses a two-flow tube header structure of a wound-tube-type heat exchanger. The two-flow tube header structure comprises a tube header assembly, a flange base and a tube sheet. The tube header assembly comprises an outer tube header and an inner tube header, wherein the inner tube header and the outer tube heater respectively comprise a nozzle and a head and a cylindrical shell which are sequentially connected, the inner tube header is arranged in the outer tube header and is connected with the outer tube header through rib plates, the nozzle of the inner tube header is led out from the cylindrical shell of the outer tube header, the lower end of the cylindrical shell of the outer tube header is fixedly arranged on the flange base, two annular sealing surfaces which are arranged in the same plane are arranged on the upper end surface of the tube sheet and are respectively connected with the bottom end surface of the cylindrical shell of the inner tube header and the bottom end surface of the flange base which is connected with the bottom end of the cylindrical shell of the outer tube header, gaskets are arranged between the connected end surfaces, and the flange base is connected with the tube sheet through bolts to tightly fasten the integral inner and outer tube headers on the tube sheet. The two-flow tube header structure has the advantages that the design and manufacturing difficulty and the production cost are reduced, the unreasonable design structure with a bypass tube header on a shell side is avoided, the design calculation and the manufacturing difficulty are reduced, the overall performance is excellent, the structure is convenient to assemble and the operation for maintenance, inspection, repair and the like is easy to conduct.

The invention relates to an adsorption type low temperature heat resource power generation and refrigeration device in the technical field of energy, which comprises a working medium pump, a vapor generator, a turbine, a generator, an adsorption refrigerator, a throttle valve, and an absorber which are connected in turn. Solar energy, geothermal energy, biomass energy or various industrial exhaust heat is taken as a system heat source; a binary working medium is selected as a system working medium; in the process of heating the heat source, a low boiling point volatile component of the binary working medium is changed into a gaseous state to push the turbine to do work and generate electricity, and the liquid part of the binary working medium releases heat in the adsorption refrigerator to realize refrigeration; and a gas working medium flowing out of an outlet of the turbine is re-absorbed by the liquid working medium flowing out of the adsorption refrigerator in the absorber so as to finish a working cycle. The device combines a low temperature Rankine cycle and an adsorption refrigeration cycle, and continuously outputs electric energy and cold energy when low-grade heat energy is continuously recycled, thereby realizing the power generation and the refrigeration by utilizing low temperature exhaust heat.

The invention relates to the field of electric power system automation, and specifically relates to a current transformer. The current transformer comprises mutual inductance coils composed of closed iron cores and windings. The mutual inductance coils comprise two groups, namely a first mutual inductance coil and a second mutual inductance coil. The ratio of the number of turns of the secondary winding of the first mutual inductance coil to the number of the primary winding of the first mutual inductance coil is larger than the ration of the number of turns of the secondary winding of the second mutual inductance coil to the number of the primary winding of the second mutual inductance coil. The first mutual inductance coil is connected to a comparison circuit, the second mutual inductance coil is connected to an amplification circuit, and the amplification circuit is connected to the comparison circuit. According to the invention, an output distortion problem of the current transformer under a low load condition is solved, the metering accuracy is improved, and the economic loss for the power grid is reduced.

The invention relates to a super-plastic forming / diffusion bonding forming method for a large-curvature complex surface titanium alloy part and belongs to the field of metal plates and hot working. Through reasonably and accurately calculating the unfold size of a part, residual materials on the wrinkled region of the part are removed through cutting in advance, after pre-forming is completed, overall welding and hot shape correction are performed, and the pre-formed and welded part is placed in the same tool so that super-plastic forming / diffusion bonding forming can be performed on the part. Without the help of blank holder force, pre-forming and super-plastic forming / diffusion bonding forming are completed through the same tool, one-time hot forming of the large-curvature complex surface part is completed, the defect that the part is wrinkled and loses stability is overcome, and technology difficulty and tool structure complexity are lowered. The part formed through the method has advantages.

The invention relates to a yarn pressing device of a flat knitting machine and a working method thereof. The sinker is installed in a sinker containing groove; the sinker includes a sinker body, an elastic presser foot part, a power heel part and a yarn pressing part; There are three rotation positioning holes on the body, and a through hole for limit on the yarn pressing part; there are three through slots on the sinker needle plate, and one No. 1 positioning steel wire is installed in each through slot, and three one No. 1 positioning steel wires respectively pass through three rotating positioning holes; the axis lines of the three No. 1 positioning steel wires are not on the same straight line as the three intersection points generated by the same cross section, and the three intersection points determine a virtual circle, and the centers of all virtual circles A virtual axis line is formed; under the action of power, the heel of the power plate makes the sinker rotate back and forth around the virtual axis line. The yarn pressing device reduces the requirements for the use of rollers, presser feet and other flat knitting machine mechanisms during weaving, facilitates the structural design optimization of the integrated garment machine, and is beneficial to control the overall production cost.