Heat shielding cladding

Details Heat shielding cladding Heat shielding cladding

1992-12-24

1995-01-24

Reynolds, Bruce A.

Industrial electric heating furnaces

Resistance furnace device

Lining

373 71, 373 75, 373155, 373162, 29456, 52506, 52509, F27D 100

Patent

active

053848047

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a heat shielding or protective cladding for walls, ceilings, and similar surfaces (wall means), especially of industrial furnaces, with the cladding being formed from butted together parallelepipedal bodies (modules) that are secured to the wall means and comprise a plurality of held together and compacted fiber mat webs that are prestressed in a direction parallel to the wall means.
With such a heat shielding cladding, which is comprised of modules, for industrial furnaces or other high temperature apparatus, the modules are pressed together, i.e. are held under prestress, before and during the time that they are mounted on the wall means, by clamping elements such as bands, cardboard boxes, or pieces of wood. After a surface or wall means that is to be insulated or covered has been completely equipped with such modules, the clamping elements are loosened, whereupon the modules swell or expand and the gaps or seams that resulted during assembly between the individual modules are closed. In this connection, the use of fiber mat webs of refractory material such as metal oxide compounds has proven to be satisfactory as insulating material during the construction of the modules because such materials can withstand high temperatures. However, the problem with these heat shielding claddings is that ceramic fibers contract when they are exposed to high temperatures for long periods of time. This leads to the formation of gaps, especially at the seams between those sides of adjacent modules in the heat shielding cladding that are not under prestress. These gaps can extend all the way from the surface of the heat shielding cladding to the wall means that are to be insulated. In order to prevent damage to the wall means due to thermal penetration at the gaps, it is essential to continuously inspect the heat shielding cladding and to eliminate the gaps by filling them with insulating material.
It is therefore an object of the present invention to embody a heat shielding cladding of the aforementioned type that comprises modules of fiber mat webs in such a way that the cladding ensures an excellent insulating effect while preventing the formation of gaps.


SUMMARY OF INVENTION

This object is inventively realized in that adjacent modules are held together in a permanently flexible bond on the non-prestressed sides by at least one filamentary, temperature-resistant connecting or binding means that, without kinking, is guided from the surface of the heat shielding cladding to the wall means.
A permanently flexible bond is obtained between the modules as a consequence of the inventive connection of adjacent modules, at their non-prestressed sides, with a filamentary, temperature-resistant binding means that is guided without kinking, that is expediently made of mineral fibers, especially ceramic fibers, and that extends helically through the modules on both sides of a butt joint or plane of separation. During contraction of the modules under the effect of temperature, the permanently flexible bond reliably connects the gaps between the non-prestressed sides of the modules that result during assembly. Since in this way a thermal penetration through the insulation need not be feared, it is possible to dispense with an inspection of the inventive heat shielding cladding for the formation of gaps, as a consequence of which a high temperature insulation of industrial furnaces or the like that is essentially maintenance free is obtained. The danger of a formation of gaps, and hence of thermal penetration, can also be counteracted by providing the modules with slits that extend from the hot side in a direction parallel to the non-prestressed sides thereof in order in this way to distribute the contraction of each module to a plurality of small gaps.
The loosening and removal of the clamping elements after the modules have been secured to the furnace surface that is to be insulated is laborious due to the swelling of the modules. Furthermore, the necessary removal o

REFERENCES:
patent: 2120133 (1938-06-01), Kohler
patent: 3832815 (1974-09-01), Balaz et al.
patent: 4177616 (1979-12-01), Lampert
patent: 4222337 (1980-09-01), Christiansen
patent: 4437286 (1984-03-01), Maguire
patent: 4478022 (1984-10-01), Wilkinson et al.
patent: 4677731 (1987-07-01), Sommerer et al.
patent: 5014482 (1991-05-01), Alexander

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