| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating box superior in heat insulating performance and reliability and capable of being depressurized in a short time while quickly exhausting a powder core material having high exhaust resistance. <P>SOLUTION: The vacuum heat insulating box 1 in a vacuum heat insulating structure includes the powder core material 5 provided in a space 7 formed by an outer box 2, an outer box cover 3 and an inner box 4 each using a gas poorly-permeable material, the outer box cover 3 having a plurality of cylindrical exhaust ports 8 protruded to the outside for use in depressurizing the space 7, the space 7 being depressurized and sealed. The powder core material 5 is divided into a plurality of parts in the vertical direction by air permeable materials 6 communicated with the exhaust ports 8. The air permeable materials 6 also exist between the outer box 2 and the powder core material 5, between the outer box cover 3 and the powder core material 5, and between the inner box 4 and the powder core material 5, respectively. The air permeable materials 6 communicated with the exhaust ports 8, the air permeable materials 6 on the outer box side between each of the outer box 2 and the outer box cover 3 and the powder core material 5, and the air permeable material 6 on the inner box side between the inner box 4 and the powder core material 5 are joined to one another. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
