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Vacuum separator for dewar flask cold exchange systems

  • US 4,944,155 A
  • Filed: 06/14/1989
  • Issued: 07/31/1990
  • Est. Priority Date: 06/14/1989
  • Status: Expired due to Fees
First Claim
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1. A cold exchange system for cooling a device in a device housing comprising:

  • a Dewar flask including;

    an inner vessel for containing a cryogenic liquid;

    an outer vessel joined to and surrounding said inner vessel and defining a first evacuable chamber therebetween;

    an evaporation port through said inner vessel and said outer vessel through which the cryogenic liquid can evaporate;

    a device port through said outer vessel; and

    means for sealingly engaging the device housing to said outer vessel in communication with said device port;

    a cold finger in heat transfer relation with said inner vessel;

    a vacuum separator including;

    a flexible non-metallic bellows having open ends, sealingly engaged at one of said ends to said cold finger and at the other of said ends to said outer vessel in communication with said device port, whereby said non-metallic bellows and the device housing define a second evacuable chamber separate from said first evacuable chamber; and

    means for mounting the device to be cooled within said bellows in direct mechanical contact and heat transfer relation with said cold finger.

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