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Qualité de la lubrification des paliers à roulement des compresseurs avec des mélanges huile-frigorigène.

Lubrication quality of compressor rolling bearings with oil-refrigerant mixtures.

Numéro : 1258

Auteurs : HAULEITNER R., MORALES-ESPEJEL G. E.

Résumé

Rolling bearings in refrigerant compressors are lubricated with a mixture of oil and refrigerant. This has always represented a challenge for the bearing lubrication quality estimation (e.g.: kappa or lambda parameters). Even if the mixture rate is known, the exact effect on the lubricant film thickness remains doubtful due to the unknown piezo-viscosity and compressibility of the refrigerant and their variation with pressure and temperature. In this work, existing mixing laws for viscosity and piezo-viscosity are examined and adapted to better represent existing measurements. The results are compared with published Daniel plots showing reasonable agreement. Once this is done a modification to the bearing lubrication quality parameter kappa is proposed to better reflect the effect of the refrigerant on the lubrication quality of compressor rolling bearings. This is a first step in the direction of predicting the bearing life for this challenging application.

Considerations of machine efficiency and environmental impact lead to ever new development of refrigerants and refrigeration oils. The refrigeration industry must adopt quickly to these changes. The capability to predict accurately the film thickness in lubricated contacts and having tools available to perform a reliable bearing selection are prerequisites for a robust machine design. The modelling capability of the lubrication quality does not only support the bearing life prediction but will facilitate the assessment of other fundamental bearing performance ratings such as friction and heat generation. The potential of the lubrication quality prediction is outlined in an example of a screw compressor in an air conditioning application.

Documents disponibles

Format PDF

Pages : 10

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Lubrication quality of compressor rolling bearings with oil-refrigerant mixtures.
  • Identifiant de la fiche : 30028361
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2021 Purdue Conferences. 25th International Compressor Engineering Conference at Purdue.
  • Date d'édition : 05/2021
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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