Evaporator for a refrigeration appliance

Abstract

An evaporator for a refrigeration appliance comprising a tube extension presenting an inlet ( 11 ) for the refrigerant fluid in liquid state and an outlet ( 12 ) for the refrigerant fluid in gaseous state, said tube extension ( 10 ) comprising at least two tube portions ( 10 a, 10 b ) arranged in series and having different diameters which are dimensioned to guarantee, to the refrigerant fluid flow, a more uniform speed in the interior of the evaporator, without altering the flow rate of this refrigerant fluid between the inlet ( 11 ) and the outlet ( 12 ) of the tube extension ( 10 ).

1 . An evaporator for a refrigeration appliance comprising a tube extension presenting an inlet ( 11 ) for the refrigerant fluid in liquid state and an outlet ( 12 ) for the refrigerant fluid in gaseous state, characterized in that said tube extension ( 10 ) comprises at least two tube portions ( 10   a ,  10   b ) arranged in series and having different diameters, which are dimensioned so as to guarantee, to the refrigerant fluid flow, a more uniform speed along the different tube portions, without altering the flow rate of this refrigerant fluid between the inlet ( 11 ) and the outlet ( 12 ) of the tube extension ( 10 ).  
   
   
       2 . The evaporator as set forth in  claim 1 , characterized in that it comprises a transition region ( 20 ) interconnecting each two tube portions ( 10   a ,  10   b ) of different diameters and arranged in series.  
   
   
       3 . The evaporator as set forth in  claim 2 , characterized in that the transition region ( 20 ) has a diameter that varies between the diameters of the tube portions ( 10   a ,  10   b ) to which it is interconnected.  
   
   
       4 . The evaporator as set forth in  claim 2 , characterized in that the transition region ( 20 ) has a diameter that varies gradually.  
   
   
       5 . The evaporator as set forth in  claim 4 , characterized in that the transition region ( 20 ) is substantially frusto-conical.  
   
   
       6 . The evaporator as set forth in  claim 2 , characterized in that the transition region ( 20 ) is an annular tube portion, disposed orthogonal to the axis of the tube portions ( 10   a ,  10   b ) to which it is interconnected.