An absorber tube for solar collectors is provided. The absorber tube comprises a metal tube for carrying and heating a heat transfer medium, a sleeve tube enclosing the metal tube for forming an annular space that can be evacuated, a first container disposed in the annular space and filled with prot
An absorber tube for solar collectors is provided. The absorber tube comprises a metal tube for carrying and heating a heat transfer medium, a sleeve tube enclosing the metal tube for forming an annular space that can be evacuated, a first container disposed in the annular space and filled with protective gas, an outer ring, and a transition element enclosing the metal tube for sealing off the annular space. The first container includes an outlet opening closed by a closure material, which releases the outlet opening under external actuation for introducing the protective gas into the annular space. The external actuation is applied by an opening unit that is activated for releasing the outlet openings. The first container is fixed in the annular space by a retaining device, which is on the outer ring and/or on the transition element.
대표청구항▼
1. An absorber tube for a solar collector, comprising: a metal tube for conducting and heating a heat transfer medium;a sleeve tube enclosing the metal tube and forming an annular space that can be evacuated;a first container in the annular space and filled with protective gas, the first container h
1. An absorber tube for a solar collector, comprising: a metal tube for conducting and heating a heat transfer medium;a sleeve tube enclosing the metal tube and forming an annular space that can be evacuated;a first container in the annular space and filled with protective gas, the first container having an outlet opening closed by a closure material, the closure material opening the outlet opening upon external activation by an opening unit to introduce the protective gas into the annular space; andan outer ring and a transition element that enclose the metal tube to seal the annular space, the first container being fixed in place in the annular space by a retaining device, the retaining device being disposed on the outer ring and/or on the transition element,wherein the retaining device comprises one or more solder points of metal solder and the closure material comprises metal solder, at least one of the solder points also closing the outlet opening in order to fix the first container in the annular space. 2. An absorber tube for a solar collector, comprising: a metal tube for conducting and heating a heat transfer medium;a sleeve tube enclosing the metal tube and forming an annular space that can be evacuated;a first container in the annular space and filled with protective gas, the first container having an outlet opening closed by a closure material, the closure material opening the outlet opening upon external activation by an opening unit to introduce the protective gas into the annular space;an outer ring and a transition element that enclose the metal tube to seal the annular space, the first container being fixed in place in the annular space by a retaining device, the retaining device being disposed on the outer ring and/or on the transition element; anda second container filled with a getter material for binding free hydrogen and disposed in the annular space, the second container being fixed in place in the annular space by the retaining device. 3. The absorber tube according to claim 2, wherein the external activation is heat activation. 4. The absorber tube according to claim 3, wherein the opening unit comprises an electrical coil and a metal disk or washer and the outlet opening can be heated inductively to provide the heat activation. 5. The absorber tube according to claim 2, wherein the retaining device comprises one or more solder points of metal solder. 6. The absorber tube according to claim 5, wherein the closure material comprises metal solder. 7. The absorber tube according to claim 6, wherein at least one of the solder points also closes the outlet opening in order to fix the first container in the annular space. 8. The absorber tube according to claim 2, wherein the outer ring has one or more projections projecting into the annular space for positioning the first and/or second container. 9. The absorber tube according to claim 8, wherein one of the one or more projections projects into the outlet opening of the first container and is provided with a marking for identifying the outlet opening. 10. The absorber tube according to claim 2, wherein the first and second containers are annular and enclose the metal tube. 11. The absorber tube according to claim 10, wherein the first container has a first surface and the second container has a second surface by which the first and second containers are connected into one component. 12. The absorber tube according to claim 11, wherein the first and second surfaces extend radially to a longitudinal axis of the absorber tube. 13. The absorber tube according to claim 11, wherein the first and second surfaces run parallel to a longitudinal axis of the absorber tube. 14. The absorber tube according to claim 10, wherein the first container is a first ring segment and the second container is a second ring segment that are joined together to form a closed ring. 15. The absorber tube according to claim 10, wherein the first container has one or more first ring segments and the second container has one or more second ring segments, wherein the first and second ring segments are fixed in place separately from one another in the annular space. 16. The absorber tube according to claim 15, wherein the first and second ring segments are configured as half rings. 17. The absorber tube according to claim 2, further comprising a first half that faces a collector mirror of the solar collector and a second half turned away from the collector mirror, wherein the second container is in the second half. 18. The absorber tube according to claim 2, wherein the transition element has a first region with a first diameter and a second region with a second diameter, the first and second diameters reducing heat expansion. 19. The absorber tube according to claim 2, wherein the outer ring is stainless steel and the transition element is kovar. 20. A solar collector comprising the absorber tube of claim 2 and a collection mirror. 21. The solar collector of claim 20, further comprising a device for introducing the protective gas into the annular space.
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이 특허에 인용된 특허 (7)
Takeuchi Hirosato (Tokyo JPX) Mikiya Toshio (Tokyo JPX), Retaining device for an inner tube of an evacuated double-tubing type solar heat collector.
Klapwald, Shmulik, Heat receiver tube, method for manufacturing the heat receiver tube, solar collector with the heat receiver tube and method for producing electricity by using the solar collector.
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