| 摘要 |
A scroll compressor using helium gas as working gas, has a fixed scroll and an orbiting scroll, engaged with each other, each having a scroll tooth profile shape of a set volume ratio of a scroll wrap portion of 1.8 to 2.3. The set volume ratio of a scroll wrap portion is defined by the following expression: <math-cwu id="MATH-US-00001"> <number>1</number> <math> <mrow> <mi>Vr</mi> <mo>=</mo> <mfrac> <mrow> <mrow> <mn>2</mn> <mo>⁢</mo> <msub> <mi>lambda</mi> <mn>1</mn> </msub> </mrow> <mo>-</mo> <mrow> <mn>4</mn> <mo>⁢</mo> <mi>pi</mi> </mrow> <mo>+</mo> <mi>alpha</mi> </mrow> <mrow> <mrow> <mn>2</mn> <mo>⁢</mo> <msub> <mi>lambda</mi> <mi>s</mi> </msub> </mrow> <mo>+</mo> <mrow> <mn>2</mn> <mo>⁢</mo> <mi>pi</mi> </mrow> <mo>+</mo> <mi>alpha</mi> </mrow> </mfrac> </mrow> </math> <mathematica-file id="MATHEMATICA-00001" file="US20020051719A1-20020502-M00001.NB"/> <image id="EMI-M00001" wi="216.027" he="18.00225" file="US20020051719A1-20020502-M00001.TIF" imf="TIFF" ti="MF"/> </math-cwu> where Vr: set volume ratio of a scroll wrap portion, lambd1: an angle at a wrap winding end portion (Involute angle), lambds: an angle at a wrap winding start portion (Involute angle), pi: circle ratio, alpha: ratio of an orbiting radius (epsith) to a base circle radius (a) of the scroll wrap (epsith/a)
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