| 摘要 |
PURPOSE:To obtain a heat-shield plate of a light weight and a compact size by sandwiching an aluminum intermediate plate between an aluminum main body wall, one surface of which is grooved and an aluminum lid for covering the groove side of the main body wall. CONSTITUTION:A shield plate 7 comprises an aluminum main body wall 9, one surface of which has grooves 10 notched, an aluminum intermediate plate 11 having brazing materials clad on both surfaces thereof, which is put on the main body wall, and an aluminum lid plate 12 superimposed on the intermediate plate, wherein the main body wall, the intermediate plate and the lid plate are united in a body by brazing and a liquid nitrogen passage is formed by the blocked groove 10. The liquid nitrogen passage formed by the groove 10 is connected to a liquid nitrogen tank 8. Thus liquid nitrogen enters the groove 10 to flow through the interior of the shield plate 7.
|
