Blowing lance tip

A blowing lance tip for bath stirring, comprising:

• a central tube configured for supplying stirring gas, closed at a bath end by a first front wall provided with at least two openings;
• an internal tube forming with the central tube a first annular cavity for the passage of a cooling liquid and ended at a bath end by a second front wall, having a central opening and one passage orifice per opening provided in said first front wall;
• an external tube forming with the internal tube a second annular cavity for the passage of the cooling liquid and closed at a bath end by a third front wall having one outlet orifice per opening provided in said first front wall and having an internal surface comprising a tapered central area which is directed towards said central opening and which has a curved enveloped surface in an axial section;
• a heat exchange space located between a) said second front wall and said third front wall and b) said central opening and said second annular cavity, and in which the cooling liquid flows;
• and
• an injector leaving each opening in said first front wall and extending to said corresponding outlet orifice passing through said corresponding passage orifice in a cooling liquid-tight manner,
• wherein said second front wall has an edge in an axial section at the central opening which is curved such that a height (H3) is defined between a front of said edge and said third front wall and wherein in the heat exchange space a minimum predetermined height (H1) is present on a side of said central opening, such that a ratio H1/H3 is between 5% and 80%.