353results about How to "Easy to Modular Design" patented technology

The invention discloses a self-excitation mixed-excitation brushless direct current (DC) power-generating system and a control method thereof, belonging to the category of brushless DC power-generating systems. The power-generating system comprises a mixed-excitation brushless DC generator, a filtering capacitor, two current transformers, an excitation current detecting and regulating circuit, an output current detecting and regulating circuit, an output voltage detecting and regulating circuit and a digital voltage-regulating controller. The control method comprises three steps of control, i.e., voltage feedback control, load current feedback control and excitation current feedback control. The DC power-generating system does not need an external auxiliary power supply and can realize constant-voltage output within a wide rotating speed and large load range. The digital control leads to easy realization of parameter adjustment and modularization design. The DC power-generating system has an important application value in an independent-power-supply DC power-generating system of an airplane, a ship, an automobile, and the like.

The invention relates to a large-power multilevel converter based on a high-frequency isolation transformer, and the large-power multilevel converter comprises a main circuit and a phase-shift control circuit of the main circuit, wherein an input stage of the main circuit is a cascade-type H-bridge rectifier, an intermediate stage of the main circuit is a high frequency direct current-direct current (DC-DC) isolation converter, and an output stage of the main circuit is a diode embedded multilevel inverter. Each H bridge rectification circuit of the cascade-type H-bridge rectifier outputs identical direct-current voltage, and the phase-shift control circuit controls the capacitance voltage at the DC side by controlling a phase shifting angle of each H-bridge rectification circuit. The large-power multilevel converter has advantages that since the cascade-type H-bridge rectifier is adopted, each H-bridge rectification circuit outputs identical DC voltage, and the phase-shift control circuit controls the capacitance voltage at the DC side by controlling the phase-shifting angle of each H-bridge rectification circuit, the unbalance problem of the capacitance voltage at the DC side in a topological structure can be flexibly solved, the independent control for the DC-side capacitance voltage is realized, the voltage stress on each switch device is reduced, and the modularization design is favored.

A floating type automatic sucker rod screwing on and off device comprises a support, a back-up wrench, a moving wrench and a rotary wrench. The support is sequentially and coaxially provided with the back-up wrench, the moving wrench and the rotary wrench from bottom to top. The back-up wrench is used for clamping a coupling of a first sucker rod and providing reactive torque needed in screwing on and off. The moving wrench is used for clamping the wrench part of a second sucker rod and achieving tightening buckling and tight buckling. The rotary wrench is used for screwing off and screwing on the sucker rods. The floating type automatic sucker rod screwing on and off device has the advantages that the blank of the floating type automatic sucker rod screwing on and off device is filled in, full-automatic and intelligent development of a drilling rig is facilitated, the number of drilling operating personnel is reduced, the operating personnel are far away from a well mouth, the injuries of occurring accidents to the operating personnel are reduced, the integration degree is high, and modular design of downstream equipment is facilitated.

The invention provides a series-parallel inverter combined optical storage microgrid structure and a control method. The whole optical storage microgrid system is formed by an energy storage subsystemand a photovoltaic subsystem which are mutually connected in parallel, wherein the energy storage subsystem and the photovoltaic subsystem supply power for an equivalent regional load concurrently through respective line impedance. The energy storage subsystem and the photovoltaic subsystem are respectively formed by cascading a plurality of inverter modules which are mutually connected in series, and realize improvement in voltage level and power capacity. Compared with the traditional hybrid optical storage microsource, the system structure provided by the invention can realize flexible control for a single energy storage and photovoltaic unit and improve the conversion efficiency of the whole system. In addition, the invention provides an MPPT algorithm based droop control method in order to realize the maximum utilization ratio of renewable photovoltaic energy; and the invention provides an SOC algorithm based upper droop control strategy in order to realize supply and demand power balance of the system and the charge state balance between the series energy storage modules, and reasonable power flow and stable voltage frequency of the off-grid system are achieved without communication.

The invention relates to a quickly assembled bamboo frame house which comprises plate units, bamboo house frames, connecting pillars and connecting beams; wherein, the frame of the plate unit is made of bamboo veneers or wood beams; the external plate of the plate unit is made of bamboo veneers; the internal plate of a wall plate unit is made of gypsum plates or bamboo veneers or light wooden plates; the internal plate of a house plate unit is made of gypsum plates; and thermal-insulation material or sound-insulation material is filled between the external plate and the internal plate. The connecting pillars and the connecting beams are made of bamboo veneers; the connecting beam is connected with the side of the wall plate unit by bolts; and the wall plate units are connected with each other by the connecting pillars and bolts. The wall plate units at the corners of a house are connected with each other by bolts and angle steel. With excellent quakeproof performance and good thermal-insulation effect, the frame house provided by the invention can be processed and assembled quickly and can be dismounted and reused; moreover, the main construction material is environmental friendly and the material source is wide; therefore, the frame house has low manufacturing cost.

The present invention relates to a preassembled tower section of a wind power plant and a method of transporting a tower section of a wind power plant, the method comprising the steps providing the tower section at a preassembly site, preassembling at least one electronic subsystem of the wind power plant onto the tower section, transporting the preassembled tower section from the preassembly site to an installation site. In effect transport thereof is considerably simplified and a higher degree of modular design and preassembly is achieved.

The invention discloses a machine tool for machining a propeller. The machine tool comprises a pedestal, a first machining device, a second machining device, and a workbench. The workbench is fixedly arranged on the pedestal, and the first machining device and the second machining device are symmetrically arranged on both sides of the workbench and are connected to the pedestal. The first machining device consists of a base, a support guide frame, an upper machining mechanism and a lower machining mechanism. The base is fixedly connected to the top surface of the pedestal, the support guide frame is fixedly arranged on the upper surface of the base, and the upper machining mechanism and the lower machining mechanism are respectively arranged on the upper part and lower part of the support guide frame. The upper machining mechanism comprises an upper fixation frame, an upper Y direction driving device, a slide carriage, and a parallel machining mechanism. The lower machining mechanism comprises a lower fixation frame, a parallel machining mechanism, and a lower Y direction driving device. According to the invention, the machine tool working space is expanded, also the rigidity and machining accuracy of the machine tool are improved, machining of the propeller can be completed by one-time clamping, and the efficiency is high.