Background technique

    At present, all induction melting furnaces smelt high-grade alloy steel, stainless steel, ultra-low carbon steel, etc. have the molten steel purity and alloy composition difficult to meet the technical requirements, the key is the argon blowing refining in the furnace. However, on the induction melting furnace, due to the electrical conductivity of the metal shell structure, the air-permeable bricks in the bottom of the furnace are subjected to electrical induction. The metal shell is oxidized and red, and the oxidized iron peels off, causing the metal shell to be welded. Ensure the technical requirements of the steel-making grades.

    The purpose of the utility model is to provide an air-permeable brick for induction melting furnace, which forms a sealed air chamber with a ceramic end cover and a groove at the bottom of the air-permeable brick core, and does not subject the air-permeable brick in the furnace bottom to electrical induction , Using argon gas pressed into the gas chamber, the induction melting furnace is directly subjected to argon blowing refining in the furnace. The following structure is used to achieve: a protective layer of a breathable brick, and a conical hole with an open top at the top, and a truncated conical breathable brick core in the cone hole are provided in the conical hole. A groove is formed at the bottom of the wall, and a sealed ceramic end cover is provided under the groove, and a gas transmission pipe extending beyond the protective layer of the breathable brick is perforated in the central hole in the center of the ceramic end cover. The lower end of the groove of the core is provided with an internal thread, and the ceramic end cover is a cylindrical flat plate, and an external thread matched with the internal thread of the groove of the air-permeable brick core is provided on the cylindrical outer edge. The ceramic end cover is a concave disc, and the inner edge of the outer edge is provided with an inner conical surface matched with the concave cone surface of the air-permeable brick core. The ceramic end cover is a cylindrical flat plate, and its top plane is pressed against the bottom surface of the groove of the air-permeable brick brick core and bonded with adhesive. The gas chamber has reliable sealing performance, and can avoid the influence of the inductor on the argon blowing refining in the furnace.

BRIEF DESCRIPTION

Fig. 1 is a sectional view of the first embodiment of the present invention.

2 is a cross-sectional view of a second embodiment of the present invention.

3 is a cross-sectional view of a third embodiment of the present invention.

In the picture: 1. Breathable brick core, 11. Groove, 12. Internal thread, 13. External cone surface,

14, concave cone surface, 2, ceramic end cap, 21, center hole, 22, external thread, 23, inner cone

Surface, 3. Breathable brick protective layer, 31, conical hole, 32, central through hole, 33, fixing piece, 4.

Air pipe.

Specific implementation of special ventilation brick for refining induction melting furnace

    The first embodiment is composed of a breathable brick core 1, a ceramic end cap 2, a breathable brick protective layer 3 and a gas pipe 4, as shown in FIG. 1, wherein: the breathable brick core 1 is truncated conical, and the bottom A groove 11 is provided, and the inner wall of the groove 11 of the air-permeable brick core 1 is provided with an internal thread 12, the air-permeable brick core l is made of refractory materials such as chrome corundum, and is provided with a narrow groove on the outer cone surface 13 Slotted long hole;

The ceramic end cap 2 is a cylindrical flat plate, and an external thread 22 which is matched with the internal thread 12 of the inner wall of the groove 11 of the air-permeable brick core 1 is provided on the cylindrical outer edge to prevent the groove of the air-permeable brick core 1 11 and the gas chamber formed by the ceramic end cap 2 leaks, and a central hole 21 is opened at the center of the ceramic end cap 2. The ceramic end cap 2 is a non-metallic object that is resistant to high temperature and high pressure.

The protective layer 3 of the breathable brick is truncated conical, and a conical hole 31 with an open top is opened therein. The conical hole 31 cooperates with the outer conical surface 13 of the breathable brick core 1 and a center of the bottom surface of the inner conical hole 31 is opened A central through-hole 32, and one or two fixing members 33 are embedded in the edge of the central through-hole 32, which belongs to the prior art;

    The gas pipe 4 is a central hole 21 of the ceramic end cap 2 and a central through hole 32 of the protective layer 3 of the air-permeable brick, and is exposed outside the protective layer 3 of the air-permeable brick. The air pipe 4 is a tube made of ceramic or metal, and One or two fixing members 33 embedded in the air-permeable brick retaining and expanding layer 3 are fixed to make the ceramic end cover 2 and the air-permeable brick core 1 more firmly combined, which belongs to the prior art.

    The ceramic end cap 2 of the second embodiment is a concave disc, and the inner side of the upper edge is an inner conical surface 23 that matches the concave cone surface 14 of the air-permeable brick core 1 to prevent the air-permeable brick core 1 from being concave As shown in FIG. 2, the gas leakage of the gas chamber formed by the groove 11 and the ceramic end cap 2 is the same as that of the first embodiment, so it will not be described in detail.

    The ceramic end cap 2 of the third embodiment is a cylindrical flat plate, and its top plane abuts against the bottom surface of the groove 11 of the air-permeable brick core 1, and is added with an adhesive to prevent the groove 11 of the air-permeable brick core 1 The air leakage of the air chamber formed with the ceramic end cap 2 is shown in FIG. 3, and the rest of the structure is the same as the first embodiment, so it will not be repeated here.