US 12,421,966 B2
Screw compressor with multi-layered coating of the rotor screws
Andreas Foerster, Coburg (DE); and Gerald Weih, Coburg (DE)
Assigned to KAESER KOMPRESSOREN SE, Colburg (DE)
Filed by KAESER KOMPRESSOREN SE, Coburg (DE)
Filed on May 29, 2024, as Appl. No. 18/676,650.
Application 18/676,650 is a continuation of application No. 18/296,163, filed on Apr. 5, 2023, granted, now 12,031,537.
Application 18/296,163 is a continuation of application No. 16/610,291, granted, now 11,649,823, issued on May 16, 2023, previously published as PCT/EP2018/060673, filed on Apr. 26, 2018.
Claims priority of application No. 17169341 (EP), filed on May 3, 2017.
Prior Publication US 2024/0309869 A1, Sep. 19, 2024
Int. Cl. F04C 18/08 (2006.01); F04C 18/16 (2006.01); F04C 27/00 (2006.01)
CPC F04C 18/16 (2013.01) [F04C 18/084 (2013.01); F04C 27/009 (2013.01); F04C 2230/91 (2013.01); F04C 2240/20 (2013.01); F04C 2240/30 (2013.01); F04C 2240/50 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A rotor screw of a screw compressor, the rotor screw comprising:
a profiled surface comprising multiple layers, the multiple layers comprising:
a nanoceramic layer coating a metallic base body surface of the rotor screw;
a first layer of a first thermoplastic material coating the nanoceramic layer; and
a second layer of a second thermoplastic material coating the first layer, the second layer comprising particles or pores supporting a running-in process embedded in the second thermoplastic material.
 
8. A method for forming a profiled surface of a rotor screw of a screw compressor, the method comprising:
applying a nanoceramic layer to a metallic base body surface of the rotor screw;
applying a first layer of a first thermoplastic material to the nanoceramic layer; and
applying a second layer of a second thermoplastic material to the first layer, the second layer comprising particles or pores supporting a running-in process embedded in the second thermoplastic material, wherein the nanoceramic layer is applied to a clean surface area of the metallic base body surface.
 
14. A method for forming a profiled surface of a rotor screw of a screw compressor, the method comprising:
applying a wet paint comprising a suspension of a first thermoplastic material in a liquid to a metallic base body surface of the rotor screw;
evaporating the liquid to create a first layer of the first thermoplastic material; and
applying a second layer of a second thermoplastic material to the first layer, the second layer comprising particles or pores supporting a running-in process embedded in the second thermoplastic material.