Drying and gas or vapor contact with solids – Apparatus – Houses – kilns – and containers
Patent
1986-04-17
1988-10-04
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
Houses, kilns, and containers
34243R, 49 40, 49501, 432248, 110173R, F26B 2512
Patent
active
047747730
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a pasta dryer with an insulation cladding encasing the dryer, the side parts of which cladding consist of individual convex wall elements which can be braced in their edge regions against frame parts of the dryer.
BACKGROUND OF THE INVENTION
The insulation cladding of pasta dryers has to meet various requirements. For one thing, any appreciable dissipation of energy through the cladding to the outside is to be prevented. A good insulation effect of cladding also has the consequence that there are correspondingly large temperature differences between the innermost and outermost skins of the cladding, which results in different thermal expansions on the cladding. To prevent air gaps developing between the wall elements, it is known to cover their joints with sealing tapes. However, this practice may, under extreme conditions, result in it only being possible to reseal the wall elements with the use of additional sealing material when fixed during service work following a lengthy time in operation. If, as is often the case today, flat boards are used here for wall elements, the problem indicated becomes even more difficult because the dimensional stability of these boards is less.
To achieve a better dimensional stability of the wall elements, wall elements having a slight convexity (large radius) in their middle region and provided with a greater curvature (smaller radius) at their edge regions (upper and lower end regions) have already been used, whereby an improved dimensional stability could be achieved. However, with these wall elements there is the risk that, not least also on account of the different curvature of the wall elements, uneven distributions of stresses may occur over the overall cross-section of the wall elements when there are substantial differences in temperature, leading to the risk of cracks forming.
In this situation, the invention is based on the object of fitting a pasta dryer with such insulation cladding that it results in an equalization of the stress distribution over the overall cross-section of the wall elements even when large temperature differences occur between inside and outside of the dryer, and thus in a reduced risk of cracks occurring. However, it is also the particular intention that quick removal and reattachment of the wall elements as often as desired for carrying out service work should be possible without any problems.
According to the invention, this object is achieved in the case of a pasta dryer of the type stated at the start by the wall elements being of convex design in the shape of a cylinder section and the associated frame parts being adapted accordingly.
It has been shown surprisingly that the measures according to the invention result in a surprisingly dimensionally stable behavior of the wall elements even with extreme temperature changes and large temperature differences and that, obviously owing to a noticeable equalization of the stress distribution over the area of the wall elements, it has been possible to reduce distinctly the risk of the undesired formation of cracks. Compared with the previously known wall elements, which were provided with an increased curvature in their edge regions, with the pasta dryer according to the invention there was also always a very effective sealing contact between the wall elements and the associated frame parts even if substantial temperature differences occurred. Thus, in the case of the invention, the use of additional sealing tapes can be dispensed with entirely, which is virtually impossible in the case of known dryers and also means that there may no longer be the necessity of renewing the seals after carrying out service work. It has proven advantageous to provide the wall elements with a uniform wall thickness over their entire area.
In the case of the invention, the wall elements are preferably lined on their side facing the inside of the dryer with a plate, again preferably made of thin metal sheet, loosely inserted into the bow shape as a vapor barri
REFERENCES:
patent: 1891802 (1932-12-01), Drew
patent: 3149477 (1964-09-01), Bivins
patent: 4254960 (1981-03-01), Jelinek
Gebrueder Buehler AG
Schwartz Larry I.
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