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Method for sealing vacuum structure

  • US 6,264,092 B1
  • Filed: 08/09/1999
  • Issued: 07/24/2001
  • Est. Priority Date: 08/10/1998
  • Status: Expired due to Fees
First Claim
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1. A method of sealing a metal vacuum structure for evacuating a space closed by component members through an evacuation port and then sealing the evacuation port, the method comprising:

  • forming a brazing-material placing recess in one of the component members, the brazing-material placing recess opening downward when the structure is set for evacuation;

    forming an aperture in the brazing-material placing recess;

    placing brazing material, in molten state, in the brazing-material placing recess in such a way as to block the aperture and fixing the brazing material;

    forming an evacuation port in the brazing material;

    fixing a drop preventing member having a through hole on the component member in opposed relation to the brazing material;

    evacuating the space closed by the component members through the evacuation port of the brazing material;

    melting the brazing material; and

    making the evacuation port disappear to seal it by melting the brazing material as the drop preventing member prevents the brazing material from dropping.

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