Schott Ag

Fritz-Dieter Doenitz

Thomas Kuckelkorn

Nikolaus Benz

Matthias Mueller

Reinhard Maennl

Michael Siller

Guenter Bauer

The method of making a vacuum tube collector or X-ray tube, which includes a matching glass-metal joint, includes providing a glass tube () made of a glass with a composition, in percent by weight on the basis of oxide content, consisting of BO, 8-11.5; AlO, 5-9; NaO, 5-9; KO, 0-5; CaO, 0.4-1.5; balance, SiO; and bonding, preferably fusing or melting, an end portion of the glass tube () with a metal part () in order to bond or attach the glass tube to the metal part, thus forming a long-lasting glass-metal joint. The method of making the glass-metal joint is performed without using intermediary glass compositions of varying thermal conductivities. In the case of the vacuum tube collector the method can provide the basis for an automated manufacture of the vacuum tube collector.

Method of making a glass-metal joint, glass-metal joint made thereby and method of making a solar energy tube collector with said joint

The absorber pipe (), especially for a parabolic collector for a solar heat collecting apparatus, is described. The absorber pipe () includes central metal pipe (), a glass sleeve tube () surrounding the nine so that an annular space () is formed between them and an expansion compensating device connecting the central metal nine and a glass-metal transitional element () on a free end of the sleeve tube (). The expansion compensation device () connects the metal pipe and sleeve tube, so that they can slide relative to each other, and includes folding bellows () for that purpose. Furthermore it also includes a connecting element (), which has either a cylindrical or a conical section () and which connects an interior end of the folding bellows with the metal pipe.

Absorber pipe for solar heating applications

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Schirmitz, Germany

Fritz-Dieter Doenitz