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公开(公告)号：EP0986724A1
公开(公告)日：2000-03-22
申请号：EP99915249.9
申请日：1999-04-01
申请人： Raytheon Company
CPC分类号： G01J5/061 , F25B9/14 , F25D19/006
摘要： A cryogenic cooler and a dewar assembly including a cooled surface (30); a cooling surface (20) for removing thermal energy from said cooled surface (30); and an adapter (40) disposed between said cooling surface and the cooled surface for conducting thermal energy therebetween. A first fluid is disposed between the cooled surface (30) and the adapter (40) for conducting thermal energy from the cooled surface to the adapter. A second fluid is disposed between the cooling surface (20) and the adapter (40) for conducting thermal energy from the adapter to the cooling surface whereby the cooling surface remains free to move axially relative to the adapter (40) at a temperature of the cooling surface at which the first fluid is susceptible to freezing. This allows for movement of the cold finger relative to the dewar and adapter, due to differential thermal coefficients of expansion or support structure motion, without adversely affecting the communication of thermal energy from the load. In the illustrative embodiment, the cooler is a Stirling cycle cooler, the first fluid is thermal grease and the second fluid is nitrogen. The cooling surface (20) is a cylindrical cold finger of the Stirling cycle cooler and the cooled surface (30) is an inner wall of a dewar assembly. The dewar is in thermal contact with a load. The adapter is disposed between the inner wall (29) of the dewar and the cold finger. The adapter (40) has an end cap (42) and a cylindrical housing (44) extending therefrom. The housing (44) extends at least partially along a longitudinal axis of the cold finger (20). An insulator is disposed about the cold finger and the adapter housing. A spring (52) is disposed between a proximal end of the insulator (50) and a base of the cold finger (20) to maintain a distal end of the insulator (50) in contact with the adapter and the adapter (40) in contact with the dewar.
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公开(公告)号：EP0986724B1
公开(公告)日：2002-11-20
申请号：EP99915249.9
申请日：1999-04-01
申请人： Raytheon Company
CPC分类号： G01J5/061 , F25B9/14 , F25D19/006
摘要： A cryogenic cooler and a dewar assembly including a cooled surface (30); a cooling surface (20) for removing thermal energy from said cooled surface (30); and an adapter (40) disposed between said cooling surface and the cooled surface for conducting thermal energy therebetween. A first fluid is disposed between the cooled surface (30) and the adapter (40) for conducting thermal energy from the cooled surface to the adapter. A second fluid is disposed between the cooling surface (20) and the adapter (40) for conducting thermal energy from the adapter to the cooling surface whereby the cooling surface remains free to move axially relative to the adapter (40) at a temperature of the cooling surface at which the first fluid is susceptible to freezing. This allows for movement of the cold finger relative to the dewar and adapter, due to differential thermal coefficients of expansion or support structure motion, without adversely affecting the communication of thermal energy from the load. In the illustrative embodiment, the cooler is a Stirling cycle cooler, the first fluid is thermal grease and the second fluid is nitrogen. The cooling surface (20) is a cylindrical cold finger of the Stirling cycle cooler and the cooled surface (30) is an inner wall of a dewar assembly. The dewar is in thermal contact with a load. The adapter is disposed between the inner wall (29) of the dewar and the cold finger. The adapter (40) has an end cap (42) and a cylindrical housing (44) extending therefrom. The housing (44) extends at least partially along a longitudinal axis of the cold finger (20). An insulator is disposed about the cold finger and the adapter housing. A spring (52) is disposed between a proximal end of the insulator (50) and a base of the cold finger (20) to maintain a distal end of the insulator (50) in contact with the adapter and the adapter (40) in contact with the dewar.
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