Crystallizer structure, cooling device and cooling method for interior of crystallizer

The invention provides a cooling device, a crystallizer structure adopting the cooling device and a cooling method for the interior of a crystallizer. The cooling device comprises a water inlet pipe, a water outlet pipe and a middle connecting pipeline. The water inlet pipe and the water outlet pipe communicate with the middle connecting pipeline. Cooling working media are introduced into the cooling device and can cool molten steel in contact with the outer portion of the cooling device; and the temperature difference between the molten steel and the cooling working media is large, the flowing speed of the motel steel nearby a submersed nozzle is high, convective heat transfer is quick, and a good cooling effect can be achieved. According to the crystallizer structure, the cooling device and the cooling method for the interior of the crystallizer in the scheme, the traditional continuously cast blank cooling manner from the outside to the inside is changed, and the molten steel is cooled mainly through the m