SU671751A3 - Crucible - Google Patents

Description

(54) TIGEL

and the coil 4 is the supporting structure, the coor contains a cylindrical body 5, resting on the base plate 6. The layer of sealing material 7 is laid between the irpes 2 and the inductive coil 4,

Bricks 2 have a curved contour, the surfaces of the opposite ends adhere to each other along the radius of the annular structure of wall 1, i.e., the adjacent surfaces lie along the lines that go through the center of the annular structure. Using this kind of device, heat generated in a crucible or in a furnace will cause thermal expansion forces in bricks 2, and since the end faces of the bricks are predominantly close to each other, tangential or circumferential forces that occur at the interface between adjacent bricks, forcing the entire ring structure to increase in diameter, pressing the sealing material 7 to the coil 4. This can cause permanent deformation of the surrounding induction coil 4, damage to the material that causes cracks in the wall of the furnace, as a result of which metal leakage may occur.

FIG. 3 shows a top view of a crucible or furnace constructed in accordance with the invention. It should be noted that it is similar to the device shown in FIG. 1, except that the adjacent surfaces of the bricks in this case lie along the connections 8, which are at an acute angle with respect to the radius of the ring structure (see Figures 4 and 5). The radius of the crucible is indicated by line 9. We note that the adjacent surfaces of the joint 8 are at constant sharp angles and relative to the radius 9. As the bricks expand due to heat, each brick undergoes thermal expansion, which causes tangential or circumferential Ft forces (Fig. 5) and compressive stresses between bricks.

The tangential force Ft can be decomposed into two components FT and Fp. The force Fp is directed perpendicularly to the end surface or to the connection 8 between bricks; while the FT force is directed along the interface between the two bricks. As soon as the force Ft reaches the value at which the force FT is more painful than the frictional force between the bricks between the bricks, a sliding movement appears between the bricks, and each brick tends to rotate in a clockwise direction. That is, the upper and lower faces of the brick are forced to move very insignificantly towards the positions indicated by the dashed line 10. This rotation reduces

to minimize the gap between the bricks without increasing the diameter and OKpy KHOctH of the original construction of the crucibles. Conventional bricks have angles defined by TY A and B, with vi d (see Fig. 5). Under such conditions, the F-p and FT forces do not exist, since the Ft force is perpendicular to the line be, which is located at the radius of the ring structure. Therefore, it is necessary to create a form in which the FP and FT forces are present, and the contour of the brick in this case is determined by the angles A, B, C and D (see Fig. 4). In addition, it is necessary that the faces of the bricks at the opposite ends of the ring structure, defined by the A-D and B-C lines, do not pass through the center 11 of the ring crucible. Angular ratio of the lines A-D and B-C

is determined primarily by establishing a circle 12. This circle should have a radius greater than zero and smaller than the radius R of the inner circumference of the wall of the masonry formed of kirnich 13. The radius of the circle 12 should be half the radius RU of the inner circle of the crucibles. When designing bricks and when laying a crucible wall, for example, of twenty bricks, the circumference

12 is divided into twenty equal circumferential arcs, four of which are shown in FIG. 4 and are labeled 14, 15, 16, and 17. By drawing radii through points 18 at the ends of each equal arc 14, 15, and so on.

You can install the inner faces of the C-D of each ring brick. After that, wire a line from the inner radial end of D, for example, the surface of one face of a brick to point 18 on a circle 12

(Point 18 defines the intersection of the radius that intersects the inner radial end C of the surface of the other face of the brick) determine the bevel of the faces of compound 8. By repeating this process, decomposition centers are obtained, for example centers 19 and 20, and these points will be on circle 21 which is the end with circle 12.

As indicated above, the circumference 12 should not have a radius equal to half the radius of the inner circumference of the crucible wall, but this is desirable. If the radius of Circle 12 increases, the bevel of the face of compound 8 also increases. And vice versa, if

the radius of the circle 12 is reduced, the bevel is also reduced, expressed by its angle shown in FIG. five.

Claims (2)

1. Crucible, metal-lined with a cyrchum casing and induction coil, characterized in that, in order to prevent the walls from collapsing during their thermal expansion, the end faces of the brick walls are lined at opposite ends with equal sharp angles to the radius of the tiles. 6 2. A crucible according to claim 1, characterized in that the surfaces of the end faces of each brick are bevelled in the same direction. pijiJ