Method of producing a thermally insulated body

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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138149, 156286, 156292, 220422, 228 60, B32B 3106

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active

045540411

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention broadly relates to a method of fabricating a thermally insulated body and, more specifically, pertains to a new and improved method for fabricating a thermally insulated body, e.g. a pipe, having an inner shell and an outer shell, particularly a metallic inner shell and a metallic outer shell.
The thermal insulation of bodies is principally undertaken for two reasons, either to inhibit the heat losses of a medium or to prevent a thermal loading or stressing, for example of the outer shell of a container. A vacuum is the ideal thermal insulation against heat transmission or conduction; a layer or film reflecting infrared rays is suitable against heat radiation.
A thermally insulated body is known from the European Pat. No. 17,095, published Oct. 10, 1980, which comprises an outer shell and an inner shell. The intermediate space formed between both shells is maintained under vacuum and is filled with powdered porous material, e.g. activated charcoal or siliceous earth. This body is fabricated by first filling the intermediate space with the powdered insulating material and thereafter evacuating and then sealing. This procedure is particularly slow, since both the gas filling the intermediate space and the gas contained in the porous particles must be evacuated.
In order to avoid these disadvantages, the German Patent Publication No. 2,750,457, published June 22, 1978, proposes employing a gas with low thermal conductivity in place of the vacuum, which simultaneously produces the advantage that no long-term diminution of the thermal properties occurs.
A thermally insulated pipe is described in the German Patent Publication No. 2,333,933, published Jan. 24, 1974, which, among other things, comprises an inner shell and an outer shell forming an intermediate space which is filled with expanded perlite. A vacuum is obtained in the intermediate space by filling the intermediate space with carbon dioxide and relying on the temperature of the medium stored or transported in the insulated body, which is below the condensation temperature of carbon dioxide, to condense the carbon dioxide and in this manner generate a vacuum in the intermediate space. Such a thermally insulated body can, however, only function when the medium has a suitable temperature.


SUMMARY OF THE INVENTION

Therefore, with the foregoing in mind, it is a primary object of the present invention to provide a new and improved method for fabricating a thermally insulated double-shelled body which does not exhibit the aforementioned drawbacks and shortcomings of the prior art constructions.
Another and more specific object of the present invention aims at providing a new and improved method for the fabrication of a thermally insulated double-shelled body in which the intermediate space is filled with a porous thermal insulation material having a high absorption capacity for gases, thus permitting the vacuum in the intermediate space to be maintained for a long period of time by the absorptive properties of the insulation material and permitting simple, reliable and time-saving operation.
Yet another further significant object of the present invention aims at providing a new and improved method for fabricating a thermally insultated body of the character described which is relatively simple in concept, extremely economical to perform, highly reliable in execution, not readily subject to failure or malfunction and requires a minimum of attention.
Now in order to implement these and still further objects of the invention, which will become more readily apparent as the description proceeds, the method of the present invention for fabricating a thermally insulated body, e.g. tube, having an inner shell and an outer shell, in particular a metallic inner shell and a metallic outer shell, forming an intermediate space which is filled with a porous particulate and/or porous powdered insulating material, evacuated and hermetically sealed is manifested by the features that it comprises first evacuating the inter

REFERENCES:
patent: 4208232 (1980-06-01), Wagner
patent: 4349051 (1982-09-01), Schilf

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