Absorber pipe for solar heating applications

  • US 7,013,887 B2
  • Filed: 07/08/2003
  • Issued: 03/21/2006
  • Est. Priority Date: 07/08/2002
  • Status: Active Grant
First Claim
Patent Images

1. An absorber pipe, especially for a parabolic collector in a solar heat collecting apparatus, said absorber pipe comprisinga central metal pipe (3);

  • a glass sleeve tube (2) surrounding said central metal pipe (3) so that an annular space (4) is formed between the central metal pipe and the glass sleeve tube (2);

    a glass-metal transitional element (5) on a free end of the glass sleeve tube; and

    an expansion compensating device (10) connecting the central metal pipe and the glass-metal transitional element (5) with each other so as to be slidable relative to each other in a longitudinal direction and to guarantee a vacuum-tight seal between the free end of the glass sleeve tube and the central metal pipe;

    wherein said expansion compensating device (10) comprises a folding bellows (11) and a connecting element (15, 15

    , 15

    ), said folding bellows (11) is arranged between the glass-metal transitional element (5) and the central metal pipe (3), said folding bellows (11) extends into said annular space (4), said folding bellows (11) has an outer end (13) and an inner end (12), said inner end (12) is arranged within the annular space (4), said outer end (13) is arranged outside of the annular space, and said inner end (12) of said folding bellows (11) is connected to one end of said connecting element (15, 15

    , 15

    );

    wherein another end of said connecting element (15, 15

    , 15

    ) opposite to the one end connected to the folding bellows (11) is either connected to the central metal pipe (3) or to the glass-metal transitional element (5); and

    wherein said folding bellows (11) and said connecting element (15, 15

    , 15

    ) extend sufficiently into the annular space (4) and between the grass sleeve tube (2) and the central metal pipe (3), so that said glass-metal transitional element (5) is protected from radiation which would otherwise reach the glass-metal transitional element (5) after entering the glass sleeve tube (2);

    wherein said glass-metal transitional element comprises a metal section glass-sealed directly within said free end of the glass sleeve tube.

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