| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of a gap and interference between the vortex bodies of two scrolls during operation and to maintain high compression performance even when a revolving scroll and a fixed scroll are manufactured of materials different in the coefficient of thermal expansion. SOLUTION: In a scroll type fluid machinery provided with one fixed scroll 9 and the other revolving scroll 11 having vortex bodies 9b and 11b erected at the respective end plates, one scroll 9 is manufactured from a material having the coefficient (γf ) of thermal expansion and the other scroll 11 is manufactured from a material having the coefficient (γm ) higher than the coefficient (γf ). Provided the radius of a basic circle is (b), the typical size in a radial direction of an end plate is R, a typical temperature at the typical size R during operation is (t), and a difference between (γm ) and (γf ) is A, a phase deviating means is provided to engage the two vortex bodies with each other in a position further deviated to a position by a phase delay angleα(rad) calculated byα=R.t.Δ/b from a state deviating a phase by 180 deg..
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