3results about How to "Simple molding process" patented technology

This utility model discloses a photovoltaic-thermal module for an evaporator, including a photovoltaic module, a heat absorber plate, a heat absorption channel, and a frame. A junction box is provided inside the photovoltaic module. The heat absorber plate is fixedly connected to the back of the photovoltaic module, and the heat absorption channel is fixedly connected to the heat absorber plate. Refrigerant circulates within the heat absorption channel. The heat absorption channel includes a manifold and branch pipes. The manifold has a closed design at both ends and is connected to a connecting pipe. The branch pipes are internally threaded thin tubes with a diameter of 3-10 mm. Both ends of the branch pipes are connected to the manifold, and one or more semi-circular bends are provided along the length of the same branch pipe. Using this photovoltaic-thermal module significantly reduces the risk of photovoltaic panel deformation and microcracks in the solar cells, simplifies the manufacturing process, reduces costs, and optimizes heat exchange efficiency.

This invention belongs to the field of ablation-resistant thermal insulation composite material preparation technology, specifically relating to a polyacrylonitrile-based hollow carbon fiber for thermal protection materials and its preparation method. The invention first pre-oxidizes porous polyacrylonitrile precursor fibers to obtain porous pre-oxidized fibers. Then, phenolic resin is coated onto the surface of the pre-oxidized fibers through solution polymerization. After impregnation in an organosilicon source solution, rapid Joule heating at high temperature deposits both phenolic carbon microspheres with excellent ablation resistance and a silica coating on the fiber surface, forming a unique hollow carbon fiber structure with excellent thermal insulation properties. This solves the problem that polyacrylonitrile-based carbon fibers cannot simultaneously achieve both thermal insulation and ablation resistance. The thermal conductivity of the polyacrylonitrile-based hollow carbon fiber prepared by this method is about 17% lower than that of porous polyacrylonitrile carbon fibers prepared by traditional carbonization methods, making it applicable to the field of integrated ablation-resistant thermal protection materials.

The application discloses a small cavity and double-sided necking cylinder type light shield forming die and a forming process, and relates to the technical field of composite material forming. The size and layer number of prepreg of upper and lower flanges, a shell and a thickened area of a product are calculated; the prepreg is cut and pasted on a male die combined structure according to the designed layer number, the upper and lower flanges and the annular thickened area are cross-laid with the whole skin, and vacuumizing is carried out during the layering; the upper flange pressing block and the lower flange pressing block are connected with the male die combined structure through bolts, and pressing is carried out to compress the gap between the upper and lower flanges; the combined die is put into a pressing die as a whole, then a guide column is put in, the pressing die is closed, and the die assembly is completed; and demolding is carried out after heat curing forming. The process is simple, the die has high reliability, can be used for a long time, reduces the labor cost and the material cost, improves the forming quality of the cylindrical part, improves the product yield, is suitable for batch production of product manufacturing, and has a wide application prospect.