 Structure feature:
SHCMV tube is mainly assembled with heat-pipe, borosilicate glass tube, heat-collecting plates, metal cover, getter, heat exchanging end and aluminum safety-protection cap, etc. the magnetic-control sputtering selective absorptive coatings on the heat-collecting plates has a high absorption coefficient of more than 94%, and the emission coefficient around 8%. The vacuum degree in the borosilicate glass tube is more than 5×10-3Pa, equipped with long effective air degassers to keep the setting vacuum degree inside the tube a constant.
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| The structure and name of parts are shown in illustration. |
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 Technique specification:
Material: borosilicate glass according to ISO3585 in 1994;Transmittance of borosilicate glass: 0.94; Hemispherical emittance: 0.08; Getter according to GB/T9505-1998.
Start-up temperature: No more than 25℃
Start-up time: no longer than 2 minutes under normal sunshine.
Isothermal performance: the temperature tolerance between any 2 random points does not exceed 2℃ after 5 minutes of working.
Low temperature resistance: No breaks at -50℃.
Air pressure: P 5×10-3Pa.
Heat impact resistance: No damages after over 3 times’ alternative impacts of cold water below 25℃ and hot water over 90℃.
Pressure resistance: can withstand 0.6 MPa.
Hail resistance: no damage by the impact of ф35mm hail.
Appearance standard: the color of the selective absorptive coatings should be even, and the coatings should have no wrinkle and peelings. The support parts inside the tube should be correct and tight.
The allowed tolerance of borosilicate glass tube’s diameter should be in accordance with ISO4803:1978.
Camber of the borosilicate glass tube should be no more than 0.3%.
The transection of the borosilicate glass tube, which is 40-60mm away from flange end, should be round. The ratio of the longest to the shortest radial dimensions of borosilicate glass tube no more than 1.02.
The diameter of the heat exchanging end isф14mm, and should be matchec with the standard.
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