Displacement type compressor and method of forming coating film
OwnerYoshishige Endo, Eiichi Satoh +4inventors
InventorsYoshishige Endo, Eiichi Satoh, Akihiko Yamamoto, Yuji Yoshitomi, Koichi Inaba, Koichi Sekiguchi
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Abstract
A scroll type compressor comprises a stationary scroll and a rotary scroll which is assembled with the stationary scroll so as to define a closed space, the outer surface of the rotary scroll 22 is formed thereon with a tin compound film containing a tin compound and having a thickness of 50 μm. Such a coating film is never peeled off from a member even after long time operation, and is excellent in sealability and conformability, in the displacement type compressor.
Claims9
A displacement type fluid compressor wherein a closed space defined between a stator and a rotor is gradually decreased in association with motion of the rotor so as to suck, compress and discharge fluid, characterized in that at least one of surfaces of parts where the stator and the rotor make contact with each other is formed thereon with a tin compound coating film containing a tin compound.
A method of forming a coating film containing a tin compound, on at least one of a stator and a rotor of a displacement type compressor in which a closed space defined between the stator and the rotor is gradually decreased in association with motion of the rotor so as to suck, compress and discharge fluid, characterized by the steps of alkaline-degreasing an objective member, washing thus alkaline-degreased objective member with pure water;
- oxidation-etching the objective member washed with pure water, dipping the objective member oxidation-etched in a mixed solution containing stannate as a main component, so as to form a tin compound coating film, washing the objective member formed with the tin compound coating film with pure water, and drying and baking the objective member washed with pure water.
Dependencies are inferred from the claim text.