Long water gap combined argon blowing airproof device for continuous casting

The utility model relates to a long water gap combined argon blowing airproof device for continuous casting, which comprises a long water gap bowl body, an argon inlet, a ventilating ring, a steel casing, a gas chamber formed between the long water gap body and the ventilating ring, a ventilating ring ventilation layer, a ventilating ring stratum compactum, a long water gap bowl inner ring groove. The device is characterized in that the sealing structures belonging to the same type or different types of three prior long water gap bowl body argon blowing airproof structures, that is ventilating ring type, ring groove type and ring slit type, are assembled together, 8 to 12 slits are formed between the steel casing and the long water gap body bowl part, the gas chamber is formed between the steel casing and the long water gap body, and a combined long water gap argon blowing airproof structure is formed. The utility model aims to enhance the sealing effect at the joint of the long water gap bowl part and the water outlet, and further reduces the amount of nitrogen in the air absorbed by molten steel in continuous casting process.