Heating – Work feeding – agitating – discharging or conveying... – Removable furnace bottom section or kiln cart
Patent
1997-04-02
1999-08-17
Walberg, Teresa J.
Heating
Work feeding, agitating, discharging or conveying...
Removable furnace bottom section or kiln cart
F27D 312
Patent
active
059384344
DESCRIPTION:
BRIEF SUMMARY
This invention concerns heat insulating apparatus, and particularly but not exclusively heat insulation apparatus which can be subjected to raised temperatures during firing. The invention also relates to a heat insulation assembly and also to a kiln car.
The use of lightweight insulating materials such as ceramic fibre or foam, or other materials, has greatly increased in recent times in kilns and furnaces, and particularly those used in the ceramics industry. In the firing of ceramic articles it is now common practice to use a continuous kiln on fast firing schedules which is switched off during non-working days and at weekends. This is largely only possible due to the use of such lightweight insulating materials. One of the significant uses of such materials has been as an insulating lining on kiln car chassis, providing a considerable weight saving and thereby providing significant energy savings and permitting faster firing schedules to be used.
Lightweight insulating materials such as ceramic fibres typically have a density of 0.6-1 gcm.sup.-3. These have replaced conventional hard refractories which have densities typically of 2.1-2.6 gcm.sup.-3. It is now quite widely considered that such materials may present a health risk. Furthermore, such materials tend to be friable and can therefore provide contamination and dirt during firing, resulting in spoilt product.
According to the present invention there is provided heat insulation apparatus which can be subjected to raised temperatures during firing, the apparatus comprising a rigid hollow member with an interior in which insulating material can be located.
The apparatus preferably comprises a plurality of hollow members engageable together to define an enclosed area in which insulating material can be located. The members may be of modular configuration to permit different sizes and shapes of areas to be enclosed.
The hollow members may be configured to permit an area to be surrounded by a plurality of such members, with cover means locatable over the surrounded area. Formations may be provided on the hollow members to accept the cover means.
The hollow members may comprise a first type which extend substantially linearly, and a second type which form corners. The hollow members preferably have a continuous upper surface, may have an open lower end, and desirably are of a generally inverted U-shaped cross-section. The hollow members preferably have a continuous outer wall but may have openings in an opposite inner wall.
The members are preferably made of a refractory material such as alumina, desirably by casting. For lower temperature situations the members may be made of metal, such as a super alloy.
Projections and/or recesses may be provided on an exterior surface of the hollow members to permit engagement with another component, and/or labyrinth seals to be formed with another component. The members may be configured such that adjacent engaged members partially overlap. Interlocking means may be provided on the hollow members to enable interlocking with adjacent such members. The interlocking means may comprise male and female members.
Formations may be provided on the members for engagement with means for mounting the members on an article or fixture. The formations may comprise flanges or recesses.
The hollow members can be formed to be load bearing.
The invention also provides a heat insulation assembly comprising a plurality of hollow members according to any of the preceding eight paragraphs arranged to define an enclosed area, and an insulating material located in the enclosed area.
The hollow members may be arranged to surround an area with cover means locatable over the surrounded area. Alternatively, the hollow members may provide a substantially continuous surface with the enclosed area being defined wholly by the interior of the hollow members.
The insulating material is preferably of a lower density than the material of the hollow members, and is desirably non-rigid. The insulating material preferably comprises any of loose fill wa
REFERENCES:
patent: 1521216 (1924-12-01), Dressler
patent: 4300881 (1981-11-01), Salviati
patent: 4320612 (1982-03-01), Jeffries, Jr.
Bryan Groom Limited
Lu Jiping
Walberg Teresa J.
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