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US 11,441,682 B2Granted
Piston ring, reciprocating compressor, method for selecting piston ring and method for evaluating life of piston ring
AssigneeKobe Steel, Ltd.
InventorsTomohiro Ootsuka, Naofumi Kanei
Life of this patent
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Abstract
A piston ring is used for a reciprocating compressor. In the piston ring, polytetrafluoroethylene and polyetheretherketone or polyimide account for 50% or more by mass in total. The piston ring does not contain polyphenylene sulfide. The piston ring has a tensile strength within a range of more than 15 MPa and less than 100 MPa.
Claims6
A piston ring used for a reciprocating compressor, wherein
- polytetrafluoroethylene, and one selected from polyetheretherketone and polyimide account for 50% or more by mass in total,
- the piston ring does not contain polyphenylene sulfide,
- the piston ring has a tensile strength within a range of more than 15 MPa and less than 100 MPa.
A method for selecting a piston ring used for a reciprocating compressor, the method comprising the step of:
- selecting a piston ring in which polytetrafluoroethylene, and one selected from polyetheretherketone and polyimide account for 50% or more by mass in total, polyphenylene sulfide is not contained and a tensile strength is within a range of more than 15 MPa and less than 100 MPa, as a piston ring to be attached to an outer peripheral portion of a piston.
A method for evaluating life of a piston ring used in a reciprocating compressor, the method comprising the steps of:
- investigating a correlation between an operating time of the reciprocating compressor and pressure in a space in which pressure can rise due to leakage of compressed hydrogen gas through a gap between the piston ring and a cylinder;
- determining the operation time when the pressure in the space reaches a predetermined threshold based on the correlation;
- and
- evaluating the determined operation time as the life of the piston ring.
1 more element
Dependencies are inferred from the claim text.