JPH086232Y2 - Brick for forming arc wall - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a brick used for constructing an arc-shaped wall surface requiring heat resistance such as a melting furnace and a heat treatment furnace.

[Conventional technology] Conventional bricks for forming arc-shaped wall surfaces (hereinafter simply referred to as bricks)
Is an inner side surface facing the center side of the arc-shaped wall surface, an outer side surface facing outward of the arc-shaped wall surface, upper and lower side surfaces located above and below the inner and outer side surfaces, and right side surfaces located on both sides of the inner and outer side surfaces. And a left side surface, which is a so-called wedge-shaped planar shape in which the left and right side surfaces are formed in a tapered shape that widens from the inner side surface to the outer side surface, and the cross section extends from the upper side surface to the lower side surface. It was a uniform square prism.

And the arc-shaped wall surface was formed by arranging a plurality of the bricks vertically and horizontally.

[Problems to be solved by the device]

Generally, when a brick becomes high in temperature, it expands to generate thermal stress, and a considerable compressive stress is applied to the joint connecting the bricks, and when the temperature decreases, the brick shrinks and the stress disappears. Repeating this expansion and contraction gradually creates a gap in the joint, which requires repair or becomes unusable. Further, since the bricks are mutually restrained, a large compressive stress is generated by thermal expansion, and the bricks may be cracked by repeating expansion and contraction. This tendency was particularly strong for magnesia chrome bricks, which have a large coefficient of thermal expansion.

Further, the conventional brick is a quadrangular prismatic body having a uniform cross section, and therefore, the direction of the stress exerted on the joints and bricks around each brick is straight in all four directions, and the joints are directly stressed, so they are easily damaged. Further, the brick itself is also subjected to proper stress and is likely to be cracked, which has a short life as a whole.

On the other hand, in the lining method of the immersion pipe for the vacuum degassing apparatus shown in Japanese Patent Application Laid-Open No. 64-4416 related to the applicant's patent application, both side surfaces from the inner side surface to the outer side surface as the lining bricks are used. It is formed in a tapered shape that widens toward
Further, the both side surfaces are disclosed to be formed in a taper shape in the vertical direction.

However, since the outer surface of the brick described in the above publication was formed parallel to the inner surface, when used as an inner lining, the outer surface of the brick became straight and adhered to refractory cement (castable) to support it. However, if the adhesion is peeled off due to a difference in thermal expansion coefficient or the like, there is a drawback that the load is applied to the lower brick and easily collapses.

[Means for solving the problem]

An arc-shaped wall forming brick of the present invention for solving the above-mentioned drawbacks includes an inner surface facing the center of an arc-shaped wall of a melting furnace or the like having a circular portion, and an outer surface facing outward of the arc-shaped wall. It has a hexahedral shape consisting of upper and lower side surfaces located above and below the outer surface, and right and left side surfaces located on both sides of the inner and outer surfaces, and the left and right side surfaces widen from the inner surface to the outer surface, and It is characterized in that it is formed in a taper shape that widens from the upper side surface to the lower side surface, and the outer side surface is not parallel to the inner side surface and is narrowed in width from the upper side surface to the lower side surface.

[Action]

The brick of the present invention can form an arc-shaped wall surface in the same manner as a conventional brick by alternately laying the bricks in the opposite direction and arranging them side by side. When heat is applied to the arcuate wall surface to expand the bricks, the bricks press each other. At this time, adjacent bricks exert a force on each other, but since the left and right side surfaces are vertically tapered, the force is dispersed into a force that pushes the left and right side surfaces vertically and a force that pushes the bricks up and down. Since bricks adjacent to each other have different vertical directions, one brick is pressed upward and the other is pressed downward according to the taper direction.

Therefore, since the stress due to thermal expansion is dispersed, a joint gap is unlikely to occur, and the brick is unlikely to crack.

In addition, the outer surface of the brick is made non-parallel to the inner surface and has a taper shape that narrows from the upper surface to the lower surface, so that the thermal expansion of the brick receives it from the outer peripheral wall such as refractory cement that surrounds the outer circumference of the brick. The reaction force can be dispersed, and when it is used as an inner lining, its outer peripheral surface can be made into a zigzag-shaped refraction surface, which increases the adhesiveness with the outer peripheral wall, and at the same time, even when peeled off, the load of the brick is directly applied to the lower brick. You can keep it from hanging,
A strong structure that is hard to collapse can be formed.

Moreover, the left and right side surfaces are tapered such that they widen from the inner side surface to the outer side surface and widen from the upper side surface to the lower side surface, and the outer side surface is not parallel to the inner side surface and extends from the upper side surface to the lower side surface. Since the taper shape is made narrower, even though each surface is tapered in this way, the wall thickness of each part of the brick does not become uneven in strength, and problems such as cracking occur during firing. And the mechanical strength of each part does not become unbalanced.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

The brick 1 shown in Fig. 1 forms arc-shaped wall surfaces of various furnace bodies that require heat resistance by combining them as shown in Fig. 2, and an inner surface 1a facing the center of the arc-shaped wall surface,
The outer side surface 1b facing outward of the arc-shaped wall surface and the inner and outer side surfaces 1a, 1
It has a hexahedral shape including an upper side surface 1c and a lower side surface 1d which are located above and below b and are perpendicular to the inner side surface 1a, and a right side surface 1e and a left side surface 1f which are located on both sides of the inner and outer side surfaces 1a and 1b. Left and right sides 1f, 1e
Is formed in a taper shape (a wedge shape in cross section) that widens from the inner side surface 1a to the outer side surface 1b. And the left and right side faces 1f, 1e are
The left and right side faces 1f, 1e are formed in a taper shape such that the distance between the left and right side faces 1f, 1e increases from the upper side face 1c to the lower side face 1d. Further, the outer side surface 1b is formed in a tapered shape extending from the upper side surface 1c to the lower side surface 1d toward the inner side surface 1a.

By alternately arranging the bricks 1 in opposite directions and arranging them side by side, a cylindrical body 2 as shown in FIG. 2 is constructed. The cylindrical body 2
An example of application of is shown in Figs.

FIG. 3 is a cross-sectional view of a dip tube 3 that hangs down molten metal in a ladle (not shown) for convection. The dip pipe 3 is obtained by stacking the cylindrical bodies 2 vertically as shown in a developed view in FIG. 4 and hardening the outer periphery thereof with refractory cement 4. In this refractory cement 4, reinforcing bars 6, 6 that are integrally hung from a flange 5 are embedded.

In addition, as an application of the brick 1 of the present invention, a peripheral wall of a melting furnace, a peripheral wall of a ladle, or a heat treatment furnace having a horizontal cylinder, a flue, or the like can be considered. When applied to these, the curvature radii of the arc-shaped wall surfaces are all different, but this can be dealt with by changing the wedge-shaped taper shapes of the left and right side surfaces 1f, 1e.

 Next, the operation will be described.

When the bricks 1, 1 ... expand when heat is applied to the arc-shaped wall surfaces, the bricks 1, 1 ... press each other. At this time, adjacent bricks
1, 1 ... mutually exert forces, but since the left and right side faces 1e, 1f are tapered in the vertical direction, the force is the left and right side faces 1e, 1f.
It is divided into a force that pushes f vertically and a force that pushes bricks 1, 1… up and down. Since the bricks 1, 1 ... Adjacent to each other have different vertical directions, one is pressed upward (a in FIG. 2) and the other is pressed downward (b in FIG. 2) according to the taper direction. . Therefore, since the stress generated by thermal expansion is dispersed in various directions, it is difficult for gaps in joints to occur and for bricks to crack.

Further, since the outer side surface 1b of the brick 1 is tapered from the upper side surface 1c to the lower side surface 1d, it is possible to disperse the reaction force received from the wall of the refractory cement 4 surrounding the outer circumference of the brick 1 due to thermal expansion. Therefore, a large gap is not formed in the joint, and in the case of the immersion pipe 3, it is possible to prevent the molten metal from penetrating through the gap. Further, since the outer surface 1b is further tapered, the outer peripheral surface of the cylindrical body 2 has irregularities,
Therefore, the refractory cement 4 fits into the irregularities, so that the bond between the refractory cement 4 and the cylindrical body 2 is strengthened.

In the description of the embodiments and the like in the present invention, for convenience of description, expressions such as the upper side surface, the lower side surface, and the left and right side surfaces are used, but it goes without saying that a single brick does not have a relationship such as up, down, left, and right. Therefore, the notation of up and down or left and right may be different depending on the usage form.

[Advantages of the Invention] According to the present invention as described above, the left and right sidewalls are tapered from the upper and lower sidewalls to the lower sidewall, so that the thermal stress can be dispersed in various directions. Hardly to occur and bricks are unlikely to crack. Therefore, there is an effect that the durability of the arc-shaped wall surface is significantly improved as compared with the conventional case.

Further, by further tapering the outer surface toward the inner surface, it is possible to further disperse the thermal stress, and
Since the bond with the outer peripheral wall (refractory cement) is strengthened, there is an effect that the durability of one group can be further improved. Moreover, regardless of such taper shape, the wall thickness of each part of the brick is not made uneven in strength, so that the strength balance is not disturbed without hindering the brick firing.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view of bricks, FIG. 2 is a perspective view of bricks assembled in a cylindrical shape, and FIG.
The figure is a cross-sectional view of the immersion pipe, and FIG. 4 is a development view of bricks stacked in an arc shape. 1 ... Brick for forming an arcuate wall surface, 1a ... inner surface, 1b ... outer surface, 1c ... upper surface, 1d ... lower surface, 1e ... right surface, 1f ...
…left side.

Claims (1)

[Scope of utility model registration request] 1. An inner side surface of a melting furnace or the like having a circular portion, which faces toward the center side of the arc-shaped wall surface, an outer side surface of the arc-shaped wall surface facing outward, and upper and lower side surfaces located above and below the inner and outer surfaces. A hexahedral shape consisting of a right side surface and a left side surface located on both sides of the inner and outer side surfaces, and the left and right side surfaces widen from the inner side surface to the outer side surface and widen from the upper side surface to the lower side surface. A brick for forming an arc-shaped wall surface, characterized in that the brick wall is formed in a tapered shape, and the outer surface is non-parallel to the inner surface and narrows from the upper surface to the lower surface.