JPH0436590A - Refractory lining for induction heater - Google Patents

Abstract

PURPOSE:To ensure that a material to be heated can be heated stably for a long time even after falling-off of part of a heat-resistant inorganic fibrous board, by disposing a water-cooled type refractory support at a recessed part formed on the back side of an insulating firebrick, connecting one end of the heat-resistant inorganic fibrous board to the support, and supporting the other end firmly on the firebrick through a connecting rod. CONSTITUTION:An insulating firebrick 2 is provided on the back thereof with recessed parts 2a, in each of which is disposed a water-cooled type refractory support 5 serving to cool both the firebrick 2 and a heat-resistant inorganic fibrous board 3. A connecting rod (r) having a support fitting 5' for preventing warpage of the support 5 and a screw at a tip part thereof and destined to penetrate through the firebrick 2 and the board 3 is united to the support 5. The board 3 is firmly screwed to the firebrick 2 by the connecting rods (r), washers (w) and nuts (n). Even after falling-off part of the board 3, the firebrick 2 disposed on the rear side of the board 3 prevents the support 5 from being easily exposed. Therefore, stable heating can be performed for a long time. In addition, since the firebrick 2 and the fibrous board 3 are separably united, they can be exchanged and repaired in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement of a refractory lining in an induction heating device.

(Prior Art) The refractory lining of an induction heating device is placed to protect the heating coil from side radiation heat of the material to be heated. A type of brick in which a heat-resistant inorganic fiber board is arranged on the front surface is known, and this is described, for example, in Japanese Patent Application Laid-open No. 63-1.
Reference is made to Publication No. 63778.

(Problem to be solved by the invention) By the way, when such a fire-resistant lining is exposed to high temperatures of 1300°C or higher, the heat-resistant inorganic fiberboard partially falls off within a short period of 2 to 3 months, causing the fire-resistant lining to deteriorate. Cooling columns that were embedded and fixed within the insulation bricks were often exposed. If the water-cooled fireproof strut is exposed here, the amount of water-cooled heat loss at that part will increase, making it impossible to uniformly heat the heated material (as a result, product defects are unavoidable, and heat-resistant The inorganic fiberboard had to be replaced frequently, resulting in a significant drop in operating efficiency.

It is an object of the present invention to propose a fire-resistant lining that can uniformly heat a heated material for a long period of time even if the heat-resistant inorganic fiberboard falls off, and in which the fire-resistant bricks can be easily replaced or repaired.

(Means for Solving the Problems) The present invention includes installing a heat-resistant inorganic fiberboard on the front surface of a fire-resistant insulating brick that surrounds a material to be heated and forming a heating space for the material to be heated, and a heating coil on the back surface of the fire-resistant insulating brick. In the induction heating device that will be installed, a concave part is formed on the back of the fireproof insulation brick, and a water-cooled fireproof column is installed in this concave part, and one end of the heat-resistant inorganic fiberboard is attached to the water-cooled fireproof pillar. This is a refractory lining for an induction heating device, characterized in that it is fixed and held to a refractory insulating brick via a connecting rod that is connected to a pillar and whose other end extends toward the front of a heat-resistant inorganic fiberboard.

Now, FIGS. 1(a) and 1(b) show an example of a refractory lining in an induction heating apparatus according to the present invention. In the figures, number 1 is a material to be heated, and number 2 is a lining that surrounds the material to be heated 1 and forms a heating space. The refractory insulating bricks are divided into sections, 3 is a heat-resistant inorganic fiber board installed on the front side of the refractory insulating bricks 2, and 4 is a heating coil installed on the back side of the refractory insulating bricks 2. A recessed portion 2a is formed on the back surface. Further, reference numeral 5 denotes a water-cooled fireproof strut that is installed in the concave portion 2a of the fireproof insulating brick 2 and is useful for cooling the fireproof insulating brick 2 and the heat-resistant inorganic fiberboard 3. A supporting metal fitting 5' that prevents warping of the metal and a connecting rod r having a screw at the tip and penetrating the fireproof insulation brick 2 and the heat-resistant inorganic fiber board 3 are integrally connected, and the connecting rod r and the washer The heat-resistant inorganic fiberboard 3 is firmly fixed to the fire-resistant insulation material 2 with screws W and oak) n. Further, 6 is a heat-insulating castable made of heat-resistant inorganic fiber or the like.

(Function) The refractory lining according to the present invention has a concave portion 2a formed in the wall surface of the brick 2 facing the heating coil 4, and a water-cooled refractory column 5 is installed here. Even if a part of the water-cooled fireproof pillar 5 were to fall off, the water-cooled fireproof pillar 5 would not be easily exposed because the fireproof insulating brick 2 is located behind it, and therefore the water-cooled fireproof pillar 5 would be stable for a long period of time. can do. Furthermore, since the fire-resistant insulating bricks 2 and the heat-resistant inorganic fiberboard 3 are separated and combined, they can be replaced or repaired in a short time.

It is preferable that the supporting hardware 5' of the water-cooled fireproof column 5 has a height of about 1/3 or less of the height of the brick, and a thickness of about 15 to 20% of the thickness of the brick.

Furthermore, the fireproof insulation brick 2 may be of a separate type as shown in Fig. 1 above, or may be of an integral type.In particular, in the case of a separate type, a predetermined concave portion 2a can be obtained at the time of assembly. Make a notch in advance.

(Example) Fireproof insulation brick with a thickness of 100 mm and a thickness of 201 mm
Heat resistance when using the induction heating device shown in Figure 1 above, which combines heat-resistant inorganic fiberboard, and when using a device with the structure shown in Figure 2, which is equipped with similar bricks. The period leading up to the repair of synthetic inorganic fiberboard was investigated. As a result, it was confirmed that the device according to the present invention can extend the length by more than three times as compared to the conventional type. Furthermore, the amount of heat lost by water cooling was 173 or less than that of the conventional system.

(Effects of the Invention) Thus, according to the present invention, even if the heat-resistant inorganic fiberboard installed in front of the fire-resistant insulating brick falls off, the water-cooled column will not be easily exposed, so the repair period for the fire-resistant brick can be reduced. Not only can the heating time be extended, but the material to be heated can be heated stably for a long period of time.

[Brief explanation of the drawing]

FIG. 1(a) et al. are diagrams illustrating the configuration of an induction heating device according to the present invention, and FIG. 2 is a diagram schematically showing a conventional induction heating device. 1... Material to be heated 2... Fireproof insulation brick 2a...
・Concave portion 3...Heat-resistant inorganic fiberboard 4...Heating coil 5...Water-cooled fireproof strut r...Connecting rod
wl...Washer n...Nut Figure 1 (a) (b)

Claims (1)

[Claims] 1. A heat-resistant inorganic fiberboard is installed on the front side of a fire-resistant insulating brick that surrounds the material to be heated and forms a heating space for the material to be heated, and a heating coil is installed on the back side of the fire-resistant insulating brick. In the induction heating device, a concave part is formed on the back side of the fireproof insulation brick, and a water-cooled fireproof column is installed in this concave part.
The above-mentioned heat-resistant inorganic fiberboard is fixedly held on a fire-resistant insulating brick via a connecting rod that has one end connected to the water-cooled fireproof column and the other end extending toward the front of the heat-resistant inorganic fiberboard. Fireproof lining for induction heating equipment.