Heat Exchange System In A Turbomachine

Abstract

The present invention relates to a heat exchange system in a turbine engine comprising a number of units and equipment ( 10,20 ) to be cooled and/or lubricated, sais system comprising at least two distinct oil circuits ( 2,3 ) to cool and/or lubricate said equipment ( 10,20 ), characterized in that said system is configured to put said oil circuits ( 2,3 ) in thermal contact with each other on the one hand and with a fluid playing the part of a cold source on the other hand.

1 . Heat exchange system in a turbomachine comprising a number of units and equipment ( 10 , 20 ) to be cooked and/or lubricated, said system containing at least two distinct oil circuits ( 2 , 3 ) for cooling and/or lubricating said equipment ( 10 , 20 ), characterised in that said system is configured to put said oil circuits ( 2 , 3 ) in close thermal contact with each other on the one hand and with a fluid playing the part of a cold source on the other hand. 
   
   
       2 . Heat exchange system as in  claim 1 , characterised in that it comprises a fluid/oil exchange element ( 4 ), common to both oil circuits ( 2 , 3 ). 
   
   
       3 . Heat exchange system as in  claim 2 , characterised in that said common exchange element ( 4 ) comprises a plate ( 5 ) which incorporates each of said oil circuits ( 2 , 3 ) and which exchanges heat with the fluid of one single external side of the plate ( 5 ) or both. 
   
   
       4 . Heat exchange system as in  claim 3 , characterised in that the external side(s) of the plate ( 5 ), used for the heat exchange between the oil circuits ( 2 , 3 ) and said fluid, is/are in the form of, equipped with or surmounted with fins ( 6 ). 
   
   
       5 . Heat exchange system as in  claim 3 , characterised in that the common exchange element ( 4 ) is of a surface type, which means it comprises a single plate designed to be incorporated along an existing surface. 
   
   
       6 . Heat exchange system as in  claim 3 , characterised in that the common exchange element ( 4 ) is of a “sandwich” type, which means it comprises a stack of several plates ( 5 ) containing the individual oil circuits ( 2 , 3 ) separated by fins ( 6 ) between which said fluid circulates. 
   
   
       7 . Heat exchange system as in  claim 3 , characterised in that the oil circuits ( 2 , 3 ) are entangled in each plate ( 5 ). 
   
   
       8 . Heat exchange system as in  claim 3 , characterised in that at least one plate ( 5 ) is separated into two parts ( 5 A, 5 B) by a partition ( 7 ) where said fluid circulates and whose nature and thickness are selected to regulate the thermal interaction. 
   
   
       9 . Heat exchange system as in  claim 8 , characterised in that the partition ( 7 ) is equipped with fins ( 6 ). 
   
   
       10 . Heat exchange system as  claim 1 , characterised in that the heat exchanger fluid is the external air or a fuel. 
   
   
       11 . Heat exchange system as in  claim 1 , characterised in that it contains a fluid/oil exchange element ( 4 ), which is common to both oil circuits ( 2 , 3 ), comprising one or more tube(s) and a chamber. 
   
   
       12 . Heat exchange system as in  claim 11 , characterised in that at least a first tube comprises the first oil circuit ( 2 ) and at least a second tube comprises the second oil circuit ( 3 ), all the tubes soaking in the fluid playing the part of the cold source and circulating in the chamber ( 8 ). 
   
   
       13 . Heat exchange system as in  claim 12 , characterised in that the fluid playing the part of the cold source is the external air or the engine's fuel. 
   
   
       14 . Heat exchange system as in  claim 11 , characterised in that the tube(s) ( 9 ) carry the fluid on the one hand and soak in the partition on the other hand, a first compartment of which is a part of the first oil circuit ( 2 ) and a second compartment is a part of the second oil circuit ( 3 ). 
   
   
       15 . Heat exchange system as in  claim 1 , characterised in that each individual oil circuit ( 2 , 3 ) comprises, besides the common exchange element ( 4 ), a means of heat exchange of its own ( 2 A,  3 A). 
   
   
       16 . Heat exchange system as in  claim 15 , characterised in that the common exchange element ( 4 ) may be located either upstream or downstream from its own means of heat exchange ( 2 A,  3 A) relative to the units and equipment to be cooled and/or lubricated. 
   
   
       17 . Lubrication and/or cooling system for a turbomachine comprising a heat exchange system as in  claim 1 . 
   
   
       18 . Lubrication and/or cooling system as in  claim 17 , characterised in that the first lubrication circuit feeds the engine circuit of the turbomachine and the second lubrication circuit feeds an electric starter-generator (S/G). 
   
   
       19 . Turbine engine comprising a lubrication system as in  claim 18 .