Stoves and furnaces – Tool having fluid fuel burner – Curling iron
Patent
1988-10-05
1989-11-21
Dority, Carroll B.
Stoves and furnaces
Tool having fluid fuel burner
Curling iron
126446, 126447, F24V 210
Patent
active
048815217
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a vacuum solar collector.
In a known solar collector of this type (DE-OS 3,101,298) the bottom of the collector trough is planar. As a result, although due to its seamless deep-drawn construction the trough is self-supporting, on evacuation of the solar collector deformations of the trough also occur of such a nature that they subject the cover pane to loads and cause stresses thereof which lead to a danger of breakage of the pane.
From FR-A-2 476 814 there is known a non-evacuated solar collector comprising an absorber which is disposed between a cover and a trough, in which solar collector the trough, which is filled with sand below an insulating layer disposed below the absorber rests through its bottom, which is uneven in a not unambiguously defined manner, on a base supporting this bottom throughout the same.
The problem underlying the invention is to further develop a solar collector of the type mentioned at the beginning in the simplest possible manner so that the form changes of the sheet metal trough occurring on evacuation of the solar collector do not lead to a stressing of the cover pane involving a risk of breakage.
In another connection, that is in a vacuum solar collector in which the absorber plate is included solely between glass covers, it is known from US-A-4,186,723 to provide these covers within a planar flange-like edge with successive intermerging dome-like arches to exclude any change of form of the covers whatever to avoid breakage thereof.
By the formation according to the invention of the bottom of the sheet metal trough, in contrast, a membrane effect is achieved which prevents any bending and twisting of the trough from being transmitted inadmissibly via the walls thereof to the cover pane.
Such an effect is still further improved if the undulations of the trough bottom continue in the side walls of the sheet metal trough parallel to the undulation direction (i.e. the direction in which the wave crests and wave troughs follow each other).
Further advantageous developments of the invention are set forth in dependent claims 3 to 7.
Hereinafter a preferred embodiment of the invention will be described in conjunction with the attached drawings, wherein:
FIG. 1 shows a broken-away perspective exploded view of a vacuum solar collector,
FIG. 2 shows schematically a section at the point where a tube passes through the side wall of the collector, and
FIG. 3 is a schematic perspective illustration of the arrangement of sheet metal strips provided with support elements on the trough bottom.
FIG. 1 shows in perspective exploded view a corner region of a vacuum solar collector with a rectangular horizontal section. Said collector comprises a box-shaped trough 1 which is deep-drawn starting from a planar sheet metal and is thus integrally seamless and which is formed with side walls 2 convex seen from the outside, a corrugated sheet-like corrugated or undulated trough bottom 3 and a planar flange-like edge 4 which is parallel to the trough bottom and which includes an encircling groove 5 for receiving a seal 6. Corrugated sheet-like undulated here means that in all sections perpendicular to the wave crests or troughs substantially the same roughly sinusoidal form results. On the edge 4 via the seal 6 lies a radiation-permeable cover pane 7 for the trough which is pressed against the trough edge 4 with compression of the seal 6 by a frame 8 which engages over said pane and is connected to the trough edge 4.
In the trough beneath the cover pane 7 there is a radiation absorber 9 which is made up of strip-shaped metal plates 10 which together cover substantially the entire trough cross-section. The absorber plates are connected in pairs via angled sections 11 to the individual passes of a conduit 12 for the heat transport medium laid out in meander form over the cross-section of the trough. The conduit 12 terminates in two collecting tubes 13 (inlet and outlet) which extend parallel to the side walls (preferably the short side walls in a rectangular collector) of the col
REFERENCES:
patent: 4094301 (1978-06-01), Sorenson et al.
patent: 4142510 (1979-03-01), Hare et al.
patent: 4186723 (1980-02-01), Coppola et al.
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