Plate Heat Exchanger

Abstract

A plate heat exchanger has flow channels through which a first and a second flow passes in concurrent or countercurrent flow. The flow channels are formed for the first medium between individual plates ( 1 ) joined together to form in each case a pair (P) of plates, and for the second medium between pairs (P) of plates joined together to form a stack (S) of plates, wherein the individual plates ( 1 ) within an inlet region (E) have guide blades ( 2 ) which are formed by stamped embossments and protrude into the flow channel, wherein the guide blades ( 2 ) are formed in an arch-shaped manner with an inflow leg ( 21 ) aligned substantially parallel to the main flow direction and an outflow leg ( 22 ) aligned at an angle to the inflow leg ( 21 ).

What is claimed is: 
     
         1 . A plate heat exchanger comprising flow channels through which a first and a second flow flows in concurrent or countercurrent flow, which flow channels are formed for the first medium between individual plates ( 1 ) joined together to form in each case a pair (P) of plates, and for the second medium between pairs (P) of plates joined together to form a stack (S) of plates, wherein the individual plates ( 1 ) and the pairs (P) of plates are connected to each other at longitudinal edges ( 12 ) and support surfaces ( 13 ) running parallel to the main flow direction, wherein each individual plate ( 1 ) comprises inflow and outflow cross-sections (Z 1 , Z 2 , A 1 , A 2 ) arranged diagonally and corresponding in the longitudinal direction for the first medium, and inflow and outflow cross-sections (Z 1 , Z 2 , A 1 , A 2 ) adjacent thereto in the transverse direction for the second medium, wherein the inflow and outflow cross-sections (A 1 , A 2 , Z 1 , Z 2 ) for the first medium are in each case offset by half the height of the inflow and outflow cross-sections (Z 1 , Z 2 , A 1 , A 2 ) for the second medium, wherein the individual plates ( 1 ) within an inlet region (E) comprise guide blades ( 2 ) formed by stamped embossments protruding into the flow channel, wherein the guide blades ( 2 ) are formed in an arch-shaped manner with an inflow leg ( 21 ) aligned substantially parallel to the main flow direction and an outflow leg ( 22 ) aligned at an angle to the inflow leg ( 21 ), and wherein the individual plates ( 1 ) are provided with a profiling ( 31 ,  32 ) that generates turbulences, wherein
 the guide blades ( 2 ) of the inflow cross-sections (Z 1 , Z 2 ) do not protrude beyond the longitudinal center of the individual plates ( 1 ), wherein the inflow legs ( 21 ) and the outflow legs ( 22 ) have substantially identical lengths, and wherein the guide blades ( 2 ) are arranged at substantially the same distance from the associated transverse edge ( 14   a ,  14   b ) of the respective individual plate ( 1 ), and   the profiling ( 31 ,  32 ) generating the turbulences protrudes in the inlet region (E) of the inflow cross-sections (Z 1 , Z 2 ) up to the guide blades ( 2 ) and is recessed in the region adjoining mirror-symmetrically the longitudinal center of the individual plates ( 1 ).   
     
     
         2 . The plate heat exchanger according to  claim 1 , wherein the guide blades ( 2 ) are completely stamped through so that the guide blades ( 2 ) rest without any gap against the adjacent individual plate ( 1 ). 
     
     
         3 . The plate heat exchanger according to  claim 1 , wherein the inflow legs ( 21 ) and the outflow legs ( 22 ) are arranged at an angle between 140° and 100° relative to each other. 
     
     
         4 . The plate heat exchanger according to  claim 3 , wherein the inflow legs ( 21 ) and the outflow legs ( 22 ) are arranged at an angle between 135° and 112° relative to each other. 
     
     
         5 . The plate heat exchanger according to  claim 1 , wherein the profiling ( 31 ,  32 ) generating the turbulences has stamped knobs ( 31 ,  32 ). 
     
     
         6 . The plate heat exchanger according to  claim 5 , wherein some of the knobs ( 31 ,  32 ) are formed as spacers for adjacent individual plates ( 1 ). 
     
     
         7 . The plate heat exchanger according to  claim 1 , wherein the turbulence-generating profiling ( 31 ,  32 ) of the individual plate ( 1 ) is formed perpendicular to the main flow direction over the entire bottom ( 11 ) up to the contact surfaces ( 13 ). 
     
     
         8 . The plate heat exchanger according to  claim 1 , wherein in the region of the contact surfaces ( 13 ), the individual plates ( 1 ) comprise edge channels ( 15 ) with a cross-section that is size-variable over the longitudinal extension of said edge channels. 
     
     
         9 . The plate heat exchanger according to  claim 8 , wherein the edge channels ( 15 ) are formed to be substantially S-shaped or multiple times S-shaped. 
     
     
         10 . The plate heat exchanger according to  claim 8 , wherein the cross-section of the edge channels ( 15 ) can vary up to 50% or more.