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248results about How to "Avoid life shortening" patented technology

Glass-melting extrusion 3D (three-dimensional) printing device

The invention discloses a glass-melting extrusion 3D (three-dimensional) printing device, comprising a feeding mechanism, a printing nozzle component and a printing platform, and further comprising a forming room, a mobile thermal insulation plate, a translational mechanism and a lifting mechanism, wherein the printing nozzle component comprises a guiding pipe, a nozzle and a heating module; the guiding pipe is butt-jointed with the feeding mechanism; the nozzle is connected with the guiding pipe; the internal temperature of the forming room is controllable, and an opening port is formed in the top face of the forming room; the mobile thermal insulation plate is used for sealing the opening port, and the nozzle penetrates through the mobile thermal insulation plate and extends into the forming room; the translational mechanism is provided with the feeding mechanism, the printing nozzle component and the mobile thermal insulation plate; a lifting end of the lifting mechanism extends into the forming room through the bottom part of the forming room, and the printing platform is arranged on the lifting mechanism. The printing device disclosed by the invention has the advantages that a separate forming room is taken as a forming space, so that the situation that the service lives of electronic devices and moving components are not shortened due to high temperature influence in the forming room can be guaranteed; meanwhile the mobile thermal insulation plate is arranged for sealing the forming room, so that the heat of the forming room is further insulated and the flexible movement of the printing nozzle component is guaranteed at the same time.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Particulate matter reduction apparatus for diesel engine

A particulate matter reduction apparatus for a diesel engine, which can reduce particulate matter in a convenient manner with a relatively simple structure, while preventing the shortening of the lifespan of a filter and improving particulate matter burning efficiency, is provided. The particulate matter reduction apparatus includes a housing configured to be placed on a flow path into which exhaust gas is discharged from the diesel engine, a filter configured to collect particulate matter contained in the exhaust gas that flows in the housing, electrodes configured to transmit electronic signals to the filter, and a control unit configured to control the electric signals provided to the electrodes. The particulate matter reduction apparatus is advantageous in that particulate matter is burnt and removed by directly heating the filter. In addition, the apparatus is more convenient, compared to a system which requires a filter to be separated and cleaned. In addition, the particulate matter reduction apparatus has a more simplified structure, compared to a system that heats a filter using an electric heater or a is diesel burner. Accordingly, the manufacturing cost can be reduced. Furthermore, the particulate matter reduction apparatus is advantageous in that the filter is relatively uniformly heated rather than being partially heated, so that a long lifespan of the filter can be assured.
Owner:IND ACADEMIC COOPERATION FOUND JEJU NAT UNIVERSTIY

A solid-state heat storage and heating characteristic matching design method based on heat transfer rate balance

The invention relates to a solid-state heat storage and heating characteristic matching design method based on heat transfer rate balance, which comprises the following steps of 1) obtaining structural data, material data and operating condition parameters of a high-temperature solid-state heat storage device; 2) establishing a heat transfer rate balance model between that high-temperature heat storage material and the electric resistance heating element; 3) establishing a heat transfer model between the high-temperature heat storage material and the electric resistance heating element according to the heat transfer rate balance model; 5) determining a heat transfer couple boundary condition between the air and the surface of the electric resistance heating element; 6) judging whether thesurface temperature of the electric resistance wire is in an operating temperature range. 7) obtaining the air inlet velocity parameter satisfying the design structure of the air duct of the regenerator and the operation temperature range, so that the structure and the performance of the electric heat element and the heat storage device are matched, thereby realizing the optimization of the wholestructure. (1) The rate of change of temperature is constant, according to which the heat transfer equilibrium equation can be calculated. (2) The heat storage material and the resistance wire match.(3) The shortening of the life of the electric heating element caused by the high temperature brittleness is avoided.
Owner:SHENYANG POLYTECHNIC UNIV
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