Development of Tribotester in refrigerant surroundings to take measures against using Non-Chlorine refrigerant

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The tribotester developed in this grant consists of a pressure chamber, a tribotesting part and detection of friction and load. The pressure chamber can withstand up to 5 MPa in refrigerant gas pressure and can control the temperature of the oil bath in the tester from 10 to 80ﾟC and maintain a constant value within (]SY.+-。[)1ﾟC.The tribotesting part is a standard ring-on-block type Farex friction testor. The sliding speed ranges from 75x10<@D1-3@>D1 up to 7.3m/s, which covers the whole mixed lubrication region for new refregerants and lubricants under practical temperature, are available with a DC servo motor with 0.85 KW power output. The friction force and the contact load can be detected from the outside through bellows seals.The boundary friction coefficients for various new refrigerant and new lubricants have been obtained in the mixed lubrication region where the tribo-elements in practical compressor state in the most possibility, by means of the mixed lubrication analysis under hard EHL regime.The calculated results and the measured results by means of the contact electric resistance have been compared and agreed qualitatively. It is found that the combination of the tribotester and the mixed lubrication analysis is quite useful for selecting new lubricants and new materials against new refrigerants.