Blast furnace distributing device with nitrogen sealing structure

An improved blast furnace distributing device with a nitrogen sealing structure, comprising a fixed shell, a rotating cylinder, and a central throat;

• the rotating cylinder is installed above an interior of the fixed shell through a slewing bearing and driven by the slewing bearing to rotate around a center of rotation, and an upper part of the central throat is fixedly connected with a central ring hole above the fixed shell;
• the rotating cylinder is mainly composed of an inner cylinder, a cylinder bottom plate and an outer cylinder, wherein the cylinder bottom plate is an annular disc, the inner cylinder is arranged on an upper end surface of the cylinder bottom plate and is located on an inner side of the cylinder bottom plate, and the outer cylinder is arranged on a lower end surface of the cylinder bottom plate and is located on an outer side of the cylinder bottom plate;
• an intermediate fixed cylinder is detachably installed at an annular gap formed between the central throat and an inner cylinder of the rotating cylinder;
• an annular air chamber I is formed between the inner cylinder and the intermediate fixed cylinder;
• an outer peripheral surface of the intermediate fixed cylinder is provided with a shaft shoulder I;
• an annular gap I is provided between an outer peripheral surface of the shaft shoulder I and the inner cylinder;
• the shaft shoulder I is used as an intermediate spacer ring to divide the annular air chamber I into an upper air chamber I and a lower air chamber I, and the upper air chamber I and the lower air chamber I are connected through the annular gap I;
• a middle lower floating ring is set above the shaft shoulder I of the intermediate fixed cylinder, and a middle upper floating ring rests freely on the middle lower floating ring;
• the middle lower floating ring has a lower mating surface I, and the middle upper floating ring is correspondingly provided with an upper mating surface I configured to match the lower mating surface I;
• at least one of the upper mating surface I and the lower mating surface I is a convex annular curved surface, so that the upper mating surface I and the lower mating surface I form a line contact;
• a middle labyrinth ring is disposed within the lower air chamber I below the shaft shoulder I;
• a fixed short pipe is provided under the fixed shell, and an annular air chamber II is formed between the outer cylinder placed in the fixed short pipe;
• a shaft shoulder II is provided on an outer peripheral surface of the outer cylinder, and an annular gap II is provided between an outer peripheral surface of the shaft shoulder II and the fixed short pipe;
• the shaft shoulder II as an outer ring spacer divides the annular air chamber II into an upper air chamber II and a lower air chamber II, and the upper air chamber II and the lower air chamber II are connected through the annular gap II;
• a lower floating ring of an outer ring is set above the shaft shoulder II of the outer cylinder, and an upper floating ring of the outer ring rests freely on the lower floating ring of the outer ring;
• the lower floating ring of the outer ring is provided with a lower mating surface II on it, and the upper floating ring of the outer ring is correspondingly provided with an upper mating surface II on it matching the lower mating surface II;
• at least one of the upper matching surface II and the lower matching surface II is a convex annular curved surface, so that the upper matching surface II and lower matching surfaces II form a line contact;
• an outer labyrinth ring is arranged in the lower air chamber II below the shaft shoulder II.