Submersed nozzle heat preservation device

The utility model provides a submersed nozzle thermal insulation device which comprises a thermal insulation sleeve and a connecting piece, the thermal insulation sleeve covers the periphery of a submersed nozzle, the thermal insulation sleeve is connected with a tundish through the connecting piece, and the thermal insulation sleeve is made of polycrystalline mullite fibers. According to the heat preservation device, the heat preservation sleeve formed by splicing the two semicircular cylinders is connected with the submersed nozzle through cooperation of the magnet and the support, and in the process of replacing an integral tundish and casting molten steel, the heat preservation device can reduce temperature drop of the submersed nozzle, prevent the submersed nozzle from cracking and guarantee smooth casting. The thermal insulation device is flexible to disassemble and assemble, can be reused, reduces the consumption of refractory materials, and is more energy-saving and environment-friendly. 本实用新型提供一种浸入式水