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Propriétés lubrifiantes élastohydrodynamiques des mélanges de polyolesters et de R134a.

Elastohydrodynamic lubrication properties of polyol ester lubricants-R134a mixtures.

Auteurs : JONSSON U. J., LILJE K. C.

Résumé

A modern screw compressor contains several highly loaded metal-to-metal contacts lubricated with oil, including rolling element bearings, gears, and the rotors. These types of contacts are normally referred as Elasto-Hydro-Dynamic (EHD) or Elasto-Hydro-Lubrication contacts, due to the elastic deformation of the surfaces. The expected life of such bearings is to a large degree related to the lubricant film thickness in the bearings. The properties of the lubricant that determine the film thickness in an EHD-contact are normally the dynamic viscosity, eta, and the pressure-viscosity coefficient, alpha. In a refrigeration system, both those parameters are affected by the presence of refrigerant. An empirical model has been developed that can be used to predict the pressure-viscosity coefficient based on viscosity and amount of branched acids in the lubricant.

Détails

  • Titre original : Elastohydrodynamic lubrication properties of polyol ester lubricants-R134a mixtures.
  • Identifiant de la fiche : 1999-3517
  • Langues : Anglais
  • Source : Proceedings of the 1998 International Compressor Engineering Conference at Purdue (ICECP 1998).
  • Date d'édition : 14/07/1998
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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