Absorber pipe for solar heating applications
DCFirst Claim
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.
3 Assignments
Litigations
0 Petitions
Accused Products
Abstract
The absorber pipe (1), especially for a parabolic collector for a solar heat collecting apparatus, is described. The absorber pipe (1) includes central metal pipe (3), a glass sleeve tube (2) surrounding the nine so that an annular space (4) is formed between them and an expansion compensating device connecting the central metal nine and a glass-metal transitional element (5) on a free end of the sleeve tube (2). The expansion compensation device (10) connects the metal pipe and sleeve tube, so that they can slide relative to each other, and includes folding bellows (11) for that purpose. Furthermore it also includes a connecting element (15), which has either a cylindrical or a conical section (17,18,18″) and which connects an interior end of the folding bellows with the metal pipe.
40 Citations
27 Claims
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1. An absorber pipe, especially for a parabolic collector in a solar heat collecting apparatus, said absorber pipe comprising
a 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); andwherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A parabolic collector for a solar heat collecting apparatus, said parabolic collector comprising a longitudinally extending linear parabolic reflector (PR) having a focal line (FL) and at least one absorber pipe (1) arranged along said focal line;
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wherein said at least one absorber pipe (1) comprises a 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); andwherein said folding bellows (11) and said connecting element (15, 15′
, 15″
) extend sufficiently into the annular space (4) and between the glass 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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An absorber pipe, especially for a parabolic collector in a solar heat collecting apparatus, said absorber pipe comprising
a 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 in the longitudinal direction 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 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);wherein said connecting element (15, 15′
, 15″
) elmer extends in the longitudinal direction between the bellows (11) and the central metal pipe (3) or between the bellows (11) and the glass sleeve tube (2); andwherein said folding bellows (11) and said connecting element (15, 15′
, 15″
) extend sufficiently into the annular space (4) and between the glass 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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Specification