JPS5854637Y2 - Rod for attaching high temperature insulation material - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rod for attaching ceramic fibers to the inner surface of a high-temperature furnace such as a soaking furnace.

Ceramic fibers that can withstand operating temperatures of 1400°C and 1600°C have been developed and are commercially available.

When this ceramic fiber is installed on the inside of the furnace as a heat insulating material, if the mounting bracket is exposed to the inside of the furnace, not only will heat escape through the mounting bracket to the outside of the furnace, but also the mounting bracket exposed inside the furnace will Metal fittings are directly exposed to high temperatures, and heat-resistant materials that can be used for long periods of time at such high temperatures are difficult to obtain and expensive.

Therefore, the present applicant proposed in Japanese Patent Publication No. 53-14085 a structure for attaching ceramic fibers to the furnace wall so that the mounting fittings are not exposed to the inner surface of the furnace.

In this structure, as shown in Fig. 1, a support fitting 2 is attached to a furnace casing 1 or an existing fireproof insulation wall, and a layer 3 of ceramic fiber brackets are stacked along the furnace casing 1 in the direction of extension of the furnace casing 1. The rod 4 is passed through and supported by the support fitting 2 within the layer 3.

However, when the atmosphere in the furnace reaches a high temperature of 1300° C. or higher, the rod 4 made of heat-resistant metal softens and deforms, making it easy for the ceramic fiber blanket to fall off.

Particularly in high-temperature furnaces, the casing is protected with a refractory heat-insulating castable or the like to prevent the occurrence of hot spots, so the temperature of the rod 4 is more likely to rise.

Materials that can withstand such high temperatures include ceramics (alumina and mullite) sintered at temperatures of 1,600°C or higher, but when used in the form of rods, they have the disadvantage of being brittle and susceptible to thermal shock. be.

The present invention aims to provide an improved rod, and in order to achieve this purpose, the rod is constructed by inserting a ceramic rod loosely into a heat-resistant metal tube of approximately equal length.

The ceramic rod may be hollow or solid, and the heat-resistant metal cylinder is made of a heat-resistant metal such as SUS 310S.

2, 3, and 4 respectively show three embodiments of the rod of the present invention. The rod 3 of the present invention consists of a heat-resistant metal tube 5 and a ceramic rod 6, and the outer diameter of the ceramic rod 6 is as follows.
The ceramic rod 6 is inserted into the heat-resistant metal tube 5 so that it is 1 to 2 mm smaller than the inner diameter of the heat-resistant metal tube 5 and can move freely within the heat-resistant metal tube 5.

In FIG. 2, both ends of the ceramic rod 6 are slightly protruded from both ends of the heat-resistant metal tube 5, and a plastic cap 7 with one end having a conical point is tightly fitted into the protrusion.
The ceramic rod 6 is prevented from falling out of the heat-resistant metal cylinder 5, and the pointed tip of the plastic cap 7 is designed to easily insert it into the ceramic fiber.

In the embodiment shown in FIG. 3, the length of the heat-resistant metal tube 5 is slightly longer than the length of the ceramic rod 6, and both ends of the heat-resistant metal tube 5 are cut obliquely to facilitate insertion into the ceramic fiber.

Further, the ceramic rod 6 is prevented from coming out from the heat-resistant metal tube 5 during handling by providing plastic plugs or adhesive at both ends of the heat-resistant metal tube 5.

In the embodiment shown in FIG. 4, the ceramic rod 6 is made to protrude from both ends of the heat-resistant metal tube 5, and the protruding ends are sharpened.

In this case as well, the ceramic rod 6 and the heat-resistant metal tube 5 are bonded together with an adhesive to prevent the ceramic rod 6 from moving within the heat-resistant metal tube 5 during construction.

In the embodiments shown in FIGS. 1 to 3 above, the center of the rod 4 is supported by the support fitting 2 as shown in FIG. 1, but one end of the rod 4 is supported by the support fitting 2. In this case, only the other end of the rod 4 needs to be sharpened.

In the above, the plastic cap 7, stopper, and adhesive applied to stop the relative movement between the heat-resistant metal cylinder 5 and the ceramic rod 6 disappear due to the rise in the furnace temperature, and the heat-resistant metal cylinder 5
Since the ceramic rod 6 loosely inserted therein can move relatively freely, mutual distortion due to the difference in thermal expansion between the two can be avoided.

In addition, if a gap is created in the ceramic fiber layer and the rod 4 in the gap is partially heated rapidly, the outer heat-resistant metal tube 5 conducts heat to the entire heat-resistant metal tube 5, and the ceramic rod 6 partially heats up. It protects the ceramic rod 6 from cracking due to thermal shock caused by rapid heating, and even if the heat-resistant metal tube 5 softens, the ceramic rod 6
Since the ceramic fibers are supported by the ceramic fibers, it is possible to provide a high-temperature fixture that can prevent the ceramic fibers from falling off the furnace wall.

Furthermore, the heat-resistant metal tube 5 prevents the ceramic rod 6 from being damaged during construction and handling, and can improve the usage yield.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of the furnace wall showing how the rod of the present invention is used in a furnace, Fig. 2 is a side view of one embodiment of the rod of the present invention, with both ends shown in cross section, Fig. 3, FIG. 4 is a side view of another embodiment of the rod according to the present invention, showing a cross section of the heat-resistant metal tube. 1...Furnace casing, 2...Supporting metal fittings, 3...One layer of ceramic fiber, 4...
...Rod, 5...Heat-resistant metal tube, 6...
...Ceramic rod, 7...Plastic cap.

Claims (1)

[Scope of utility model registration request] A high-temperature insulation material mounting rod for attaching ceramic fibers by inserting a ceramic rod loosely into a heat-resistant metal cylinder of approximately equal length, holding it in a support fitting attached to a furnace casing, etc., and inserting it into ceramic fibers.