Solar heat collector

Patent · Tue Mar 17 04:00:00 EST 1987

OSTI ID:6628789

Takeuchi, H; Mikiya, T

An evacuated double-tubing solar heat collector is described comprising: an inner tube having an open end and a closed end; a selective absorption film applied over an exterior surface of the inner tube; an outer tube having an open end and a closed end; the inner tube being constructed to be received within the outer tube; and a substantially continuous annular coil spring ring being substantially found in cross section and of a predetermined thickness. The coil spring ring is disposed between and engages an interior surface of the outer tube and the exterior surface of the inner tube for spacing and resiliently supporting the inner tube relative to the outer tube. The ring is freely rotatably positioned to be moved axially along the length of the inner tube due only to frictional forces exerted on the coil spring. The coil spring ring is positioned on the inner tube at approximately a middle position along the length of the inner tube by being initially positioned on the inner tube adjacent to the closed end thereof and rotated upon itself axially along the inner tube only by frictional engagement with the interior surface of the outer tube as the inner tube is inserted into the open end of the outer tube and moved to a fully inserted position within the outer tube. The open end of the inner tube and the open end of the outer tube are fused to form a junction and hermetically sealed.

• Assignee: Nitto Kohki Co., Ltd., Tokyo
• Patent Number(s): US 4649903
• OSTI ID: 6628789
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
ABSORPTIVITY
DESIGN
DIMENSIONS
EQUIPMENT
EVACUATED COLLECTORS
EVACUATED TUBE COLLECTORS
FILMS
FRICTION
JUNCTIONS
MACHINE PARTS
MOTION
OPERATION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
POSITIONING
ROTATION
SEALS
SOLAR ABSORBERS
SOLAR COLLECTORS
SOLAR EQUIPMENT
SPACE DEPENDENCE
SPECTRALLY SELECTIVE SURFACES
SPRINGS
SURFACES
THICKNESS
THIN FILMS