Oil-free liquid chiller

F - Mech Eng,Light,Heat,Weapons – 25 – B

Patent

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Details

F25B 31/00 (2006.01) F04B 39/02 (2006.01) F04D 29/06 (2006.01) F16C 33/66 (2006.01) F25B 43/00 (2006.01) F25B 49/02 (2006.01) H02K 7/08 (2006.01) H02K 9/20 (2006.01)

Patent

CA 2610421

A refrigeration chiller employs a centrifugal compressor the impellers of which are mounted on a shaft which it itself mounted for rotation using rolling element bearings lubricated only by the refrigerant which constitutes the working fluid of the chiller system. Apparatus is taught for providing liquid refrigerant to the bearings immediately upon chiller start-up, during chiller operation and during a coastdown period subsequent to shut down of the chiller and the driver motor of the chiller's compressor for motor cooling purposes. By use of a variable speed-driven motor to drive the compressor, optimized part load chiller performance is achieved in a chiller which does not require or employ an oil-based lubrification system.

Un refroidisseur comporte un compresseur centrifuge dont les rouets sont montés sur un arbre rotatif; ce dernier est fixé à des paliers de roulement lubrifiés uniquement par le fluide frigorigène qui constitue le fluide moteur du refroidisseur. L'appareil a pour but de fournir le fluide frigorigène au palier immédiatement après le démarrage du refroidisseur, pendant le fonctionnement de ce dernier et pendant toute la période de ralentissement qui suit la fermeture du refroidisseur et l'arrêt du moteur qui entraîne le compresseur, aux fins de refroidissement de ce dernier. En utilisant un moteur à vitesse variable pour entraîner le compresseur, on optimise le rendement du refroidisseur à charge partielle dont le fonctionnement ne fait pas appel à un système de lubrification à l'huile.

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