Vacuum heat-insulating container

Abstract

A metallic vacuum heat-insulating container having a double wall structure is described. The metallic vacuum heat-insulating container includes an outer container having an outer cylinder and a metallic bottomed cylindrical bottom cover. The outer cylinder has opened upper and lower ends, a barrel portion between the upper and lower ends, a mouth portion having an inner diameter which is smaller than that of the barrel portion, and a stepped portion whose diameter is smaller than the diameter of the barrel portion which is provided on a side surface on a lower portion of the outer cylinder. An opening portion in an upper portion of the metallic bottomed cylindrical bottom cover, which has a diameter substantially the same as the diameter of the barrel portion of the outer cylinder, is allowed to abut on the stepped portion, and the abutting portions are integrated by welding.

What is claimed is: 
     
         1 . A metallic vacuum heat-insulating container, comprising:
 a double wall structure in which a metallic bottomed cylindrical inner container and a metallic bottomed cylindrical outer container are integrated in respective mouth portions, air is discharged from a void between the inner container and the outer container from a discharge hole provided on the bottom surface of the outer container, wherein the discharge hole is sealed with a vacuum-sealing material to be made into a vacuum heat-insulating layer;   the outer container includes an outer cylinder and a metallic bottomed cylindrical bottom cover;   the outer cylinder includes:   opened upper and lower ends,   a barrel portion between the upper end and the lower end, the barrel portion defined by a diameter,   a mouth portion, which is an opening portion of the upper end, having an inner diameter which is smaller than the diameter of the barrel portion, and,   a stepped portion having a diameter smaller than diameter of the barrel portion positioned on a side surface on a lower portion of the outer cylinder;   an opening portion in an upper portion of the metallic bottomed cylindrical bottom cover, which has a diameter substantially identical to the diameter of the barrel portion of the outer cylinder, is allowed to abut the stepped portion, and,   the abutting portions are integrated by welding, thereby creating a sealed space therebetween.   
     
     
         2 . The metallic vacuum heat-insulating container according to  claim 1 , further comprising at least one or more reinforcing stepped portions on the bottom surface of the bottom cover. 
     
     
         3 . The metallic vacuum heat-insulating container according to  claim 1 , wherein the sealed space contains a buffering material. 
     
     
         4 . The metallic vacuum heat-insulating container according to  claim 1 , wherein the sealed space contains a magnet. 
     
     
         5 . The metallic vacuum heat-insulating container according to  claim 1 , wherein the sealed space reduces or prevents corrosion of the outer container and the metallic bottomed cylindrical bottom cover. 
     
     
         6 . The metallic vacuum heat-insulating container according to  claim 1 , wherein the sealed space is tightly sealed. 
     
     
         7 . The metallic vacuum heat-insulating container according to  claim 1 , wherein the sealed space is tightly sealed to prevent water from infiltrating into the sealed space.