Flat-type refrigerant tube having an improved pressure-resistant strength

  • US 5,476,141 A
  • Filed: 04/19/1994
  • Issued: 12/19/1995
  • Est. Priority Date: 04/19/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A refrigerant tube of a flat type which comprises a flat aluminum plate having a length from a first end to a second end, said plate having a plurality of chambers extending therein from the first end to the second end and arranged in parallel with each other in a plane parallel to said plate, each of said plurality of chambers being defined to have a rectangular cross-section by a first pair of wall surfaces which are parallel with and separated by a first dimension D from each other and a second pair of wail surfaces which are parallel with and separated by a second dimension greater than or equal to said first dimension from each other and perpendicular to said first pair of wall surfaces, said first pair of wall surfaces connecting to said second pair of wall surfaces to form four comers of each of said chambers having said rectangular cross-section, each of said comers being formed with a curvature R determined by the following formula:

  • 
    
    space="preserve" listing-type="equation">0.2 mm≦

    R<

    <

    D/2.

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