Screw-type rotary fluid machine including rotors having treated

Details Screw-type rotary fluid machine including rotors having treated Screw-type rotary fluid machine including rotors having treated

1992-10-28

1994-05-24

Vrablik, John J.

Rotary expansible chamber devices

With wear surface treatment or integrally plated wear layer

4182011, 427305, F01C 116, F01C 2108

Patent

active

053143213

ABSTRACT:
A screw-type rotary fluid machine such as a compressor or a vacuum pump has male and female rotors which rotate within a casing, with or without mutual contact. At least one of the male and female rotors being surface-treated to have a treated surface structure. The treated surface structure is a multi-layered structures composed of a plurality of layers including a non-electrolytic Ni plating layer and at least one covering layer of organic resin. The organic resin may be one or more kinds selected from a group of engineering plastics, so as to improve mechanical strength.

REFERENCES:
patent: 3071314 (1963-01-01), Flanagan
patent: 4571165 (1986-02-01), Murata
patent: 4616985 (1986-10-01), Hattori et al.
patent: 4666786 (1987-05-01), Yano et al.
patent: 5060531 (1991-10-01), Iguchi et al.

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