Method for sealing a vacuum double wall container made of metal and associated sealed thereof

A method for manufacturing a vacuum double wall container, comprising:

• providing an inner container having a first mouth and an outer container having a second mouth, said inner container and said outer container being joined to one another at said first mouth and said second mouth, said inner container being smaller than said outer container to define a space between said inner container and said outer container;
• providing, on said outer container, a projection extending from said outer container about said exhaust port and defining a recess about said exhaust port;
• disposing a guide element on said outer container so that said guide element covers said exhaust port and so that a wing portion of said guide element is disposed in said recess;
• placing a brazing material on said guide element;
• after the providing of said projection and the disposing of said guide element, exhausting air from said space through said exhaust port and through an exhaust passage formed between said guide element and said outer container;
• after the exhausting of said air and the placing of said brazing material, heating said brazing material to melt said brazing material and seal said exhaust passage, said projection serving to limit a flow of the melted brazing material;
• and
• cooling the melted brazing material to thereby fix and seal said guide element to said outer container.

A vacuum double wall container comprising:

• an inner container having a first mouth;
• an outer container having a second mouth, said inner container and said outer container being joined to one another at said first mouth and said second mouth, said inner container being smaller than said outer container to define a space between said inner container and said outer container;
• an exhaust port provided on said outer container;
• a guide member including (a) a cap portion covering said exhaust port, (b) a projection or flange extending from said outer container about said exhaust port and defining a recess about said exhaust port, and (c) a wing portion disposed in said recess and joining said cap portion to said projection or flange, said guide member defining an exhaust passage located at least in part between said guide member and said outer container, said wing portion being provided with a plurality of holes;
• and
• a brazing material disposed in said recess, said brazing material connecting said wing portion of said guide member to said outer container through said holes, said exhaust port being sealed by said guide member and said brazing material.