Screw compressor

F - Mech Eng,Light,Heat,Weapons – 04 – C

Patent

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Details

F04C 18/52 (2006.01) F04C 28/12 (2006.01)

Patent

CA 2742729

A single screw compressor is arranged to vent the flutes of its main rotor at all times, without having to provide a check valve in the discharge port of the main rotor casing. An additional outlet port in the casing vents gas from the discharge ends of the flutes into the body of a slide instead of to the discharge port. The vented gas is guided to an exit port of the slide, from where it can reach either the discharge port or the bypass port of the casing at all times during use of the compressor and under all loading conditions. The design of the slide further allows the use of an offset discharge port in the casing, in relation to the main rotor. This means that pressure acting through the discharge port in use of the compressor tends to press the slide against another structure than the main rotor, for instance a bearing housing, giving better support to the slide. The slide also provides an improved oil delivery arrangement

L'invention concerne un compresseur à vis unique qui est destiné à purger les gorges de son rotor principal à tout moment, sans devoir disposer un clapet antiretour dans l'orifice de décharge du boîtier de rotor principal. Un orifice de sortie supplémentaire dans le boîtier purge le gaz provenant des extrémités de décharge des gorges dans le corps d'un coulisseau au lieu de l'orifice de décharge. Le gaz purgé est guidé vers un orifice de sortie du coulisseau, d'où il peut parvenir soit à l'orifice de décharge soit à l'orifice de dérivation du boîtier à tout moment pendant l'utilisation du compresseur et dans tous les états de charge. La conception du coulisseau permet en outre d'utiliser un orifice de décharge décalé dans le boîtier, par rapport au rotor principal. Cela signifie que la pression agissant à travers l'orifice de décharge pendant l'utilisation du compresseur a tendance à presser le coulisseau contre une autre structure que le rotor principal, par exemple un logement de palier, ce qui confère un meilleur support au coulisseau. Le coulisseau assure également une meilleure distribution de l'huile.

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