Plate heat exchanger

Abstract

The invention relates to a plate heat exchanger ( 1 ) of the type comprising an impervious chamber ( 2 ), a bundle of plates ( 3 ) arranged in said chamber ( 2 ) and providing therewith a free space ( 4 ), an inlet pipe ( 10 ) for hot fluid in a first circuit of this bundle ( 3 ), an outlet pipe ( 12 ) for the cooled fluid, an inlet pipe ( 20 ) for a cold fluid communicating with the inlet of the second circuit of this bundle ( 3 ), and an outlet pipe ( 21 ) for the heated fluid. The heat exchanger also comprises means ( 25 ) for channelling the cold fluid along the internal wall of the chamber ( 2 ).

1 . Plate heat exchanger of the type comprising: 
 an elongate impervious chamber;    a bundle of plates arranged in said impervious chamber and providing therewith a free space, said bundle consisting of a stack of mutually parallel plates that determine between them a double circuit for the counter-current flow of two independent fluids;    an inlet pipe for a hot fluid, connected directly to the inlet of the first circuit of the bundle of plates;    an outlet pipe for the cooled fluid, connected directly to the outlet of said first circuit;    an inlet pipe for a cold fluid communicating with the inlet of the second circuit of the bundle that is remote from the inlet of the first circuit;    an outlet pipe for the heated fluid, connected directly to the outlet of the second circuit of the bundle that is remote from the outlet of the first circuit of this bundle of plates;    wherein it comprises means for channelling the cold fluid along the internal wall of the chamber, between the inlet pipe for the cold fluid and the inlet of the second circuit of the bundle of plates.    
   
   
       2 . Plate heat exchanger according to  claim 1 , wherein the means for channelling the cold fluid comprise an internal case comprising a first wall arranged above the inlet of the first circuit and the outlet of the second circuit, and a second wall arranged in the free space and providing with the internal wall of the chamber an annular passage for said cold fluid.  
   
   
       3 . Plate heat exchanger according to  claim 2 , wherein the second wall of the internal case extends over a portion of the length of the bundle of plates.  
   
   
       4 . Plate heat exchanger according to  claim 2 , wherein the first wall of the internal case is planar or hemispherical or conical.  
   
   
       5 . Plate heat exchanger according to  claim 3 , wherein the first wall of the internal case is planar or hemispherical or conical.  
   
   
       6 . Plate heat exchanger according to  claim 1 , wherein the inlet pipe for the hot fluid, the inlet pipe for the cold fluid and the outlet pipe for the heated fluid are arranged in the region of the same end of the chamber.  
   
   
       7 . Plate heat exchanger according to  claim 2 , wherein the inlet pipe for the hot fluid, the inlet pipe for the cold fluid and the outlet pipe for the heated fluid are arranged in the region of the same end of the chamber.  
   
   
       8 . Plate heat exchanger according to  claim 3 , wherein the inlet pipe for the hot fluid, the inlet pipe for the cold fluid and the outlet pipe for the heated fluid are arranged in the region of the same end of the chamber.  
   
   
       9 . Plate heat exchanger according to  claim 4 , wherein the inlet pipe for the hot fluid, the inlet pipe for the cold fluid and the outlet pipe for the heated fluid are arranged in the region of the same end of the chamber.