| 摘要 |
<p>PURPOSE: To maintain heat insulation performance for a long period, in a heat- insulating box in which a vacuum heat insulation material is arranged. CONSTITUTION: In a heat-insulating box 10 consisting of inner and outer boxes 12 and 14 and having a vacuum heat-insulating material 16 arranged therebetweeen and having heat insulation ability in a vacuum state, the vacuum heat-insulating material 16 has a pipe passage 24 for discharge to discharge gas at the interior of the vacuum heat-insulating material. The tip thereof is extended outward from the outer box 14, the pipe passage 24 has a pressure detecting part 42 to detect the internal pressure of the vacuum heat-insulating material 16, and a pressure display part 42 to display the detecting pressure of the pressure detecting part 42 is arranged on the outside of the outer box 14.</p> |
