Advanced air and oil circuit architecture for turbomachine

Abstract

The present invention relates to a system for lubricating a turbomachine comprising at least one enclosure, called non-ventilated, with members to be lubricated and an air-oil mixture, said enclosure being closed and pressurized using dynamic pressure seals supplied with compressed air to create an airflow from the outside toward the inside of the enclosure, said enclosure comprising an outlet for conveying the air-oil mixture toward an air/oil separator, said separator being provided with an suction function favoring the flow of the air-oil mixture between the enclosure and the separator, characterized in that the lubrication system comprises additional suction means.

1 . A system for lubricating a turbomachine comprising at least one enclosure, called non-ventilated, with members to be lubricated and an air-oil mixture, said enclosure being closed and pressurized using dynamic pressure seals supplied with compressed air to create an airflow from the outside toward the inside of the enclosure, said enclosure comprising an outlet for conveying the air-oil mixture toward an air/oil separator, said separator being provided with an suction function favoring the flow of the air-oil mixture between the enclosure and the separator, characterized in that the lubrication system comprises additional suction means. 
     
     
         2 . The lubrication system according to  claim 1 , characterized in that the additional suction means are arranged before the air/oil separator. 
     
     
         3 . The lubrication system according to  claim 1 , characterized in that the additional suction means are arranged after the air/oil separator. 
     
     
         4 . The lubrication system according to  claim 3 , characterized in that the additional suction means are arranged on an air outlet and/or on an oil outlet of the air/oil separator. 
     
     
         5 . The lubrication system according to  claim 2 , characterized in that the additional suction means comprise at least one venturi. 
     
     
         6 . The lubrication system according to  claim 3 , characterized in that the additional suction means comprise at least one pump of the axial, volumetric or centrifuge type. 
     
     
         7 . The lubrication system according to  claim 5 , characterized in that the pump and the venturi are arranged on an air outlet of the air/oil separator. 
     
     
         8 . The lubrication system according to  claim 1 , characterized in that the air/oil separator is a machine of the centrifuge type ( 1 ) comprising means for the suction, pumping, and partial separation of the air-oil mixture ( 2 ), means for drying and evacuating the separated air ( 4 ) and means for degassing and forcing back the separated oil ( 3 ). 
     
     
         9 . The lubrication system according to  claim 5 , characterized in that the additional suction means comprise at least one venturi and at least one pump. 
     
     
         10 . The lubrication system according to  claim 1 , characterized in that the additional suction means are configured to be used only when pressurization of the enclosure is insufficient. 
     
     
         11 . The lubrication system according to  claim 10 , characterized in that the additional suction means are configured to be used when the turbomachine operates at low rating (ground idle). 
     
     
         12 . The lubrication system according to  claim 6 , characterized in that the pump is configured to be possibly bypassed when the additional suction function is not required. 
     
     
         13 . The lubrication system according to  claim 6 , characterized in that the pump is configured to disengage when the additional suction function is not required. 
     
     
         14 . The lubrication system according to  claim 5 , characterized in that the venturi is configured to adjust the injected airflow according to the engine ratings. 
     
     
         15 . A turbomachine comprising a lubrication system according to  claim 1 .