Plate For A Heat Exchanger And Heat Exchanger Equipped With Such Plates

Abstract

The invention relates to a plate ( 4, 12, 14 ) intended to allow an exchange of heat between a first fluid and a second fluid flowing in contact with the plate ( 4, 12, 14 ), said plate ( 4, 12, 14 ) being configured to define a circuit ( 8 ) comprising a plurality of successive passageways ( 71, 72, 73, 74 ), inside which the first fluid flows in one direction of flow, changing its direction of flow from one passageway to the other, each of said passageways ( 71, 72, 73, 74 ) having a flow section for the first fluid. According to the invention, the flow section of one passageway ( 71, 72, 73, 74 ), known as the upstream passageway, is larger than the flow section of another passageway ( 71, 72, 73, 74 ), known as the downstream passageway, which is situated downstream of the upstream passageway in the direction of flow of the first fluid in the circuit ( 8 ). The invention also relates to a heat exchanger equipped with such plates.

1 . A plate ( 4 ,  12 ,  14 ) intended to allow an exchange of heat between a first fluid and a second fluid (C, G) flowing in contact with the plate ( 4 ,  12 ,  14 ), the plate ( 4 ,  12 ,  14 ) being configured to define a circuit ( 8 ) comprising a plurality of successive passageways ( 71 ,  72 ,  73 ,  74 ), inside which the first fluid (C) flows in one direction of flow, changing its direction of flow from one passageway to the other, each of the passageways ( 71 ,  72 ,  73 ,  74 ) having a flow section for the first fluid (C), wherein the flow section of one passageway ( 71 ,  72 ,  73 ,  74 ), is an upstream passageway and is larger than the flow section of another passageway ( 71 ,  72 ,  73 ,  74 ), which is a downstream passageway, and is situated downstream of the upstream passageway in the direction of flow of the first fluid in the circuit ( 8 ). 
     
     
         2 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 1 , comprising an initial passageway ( 71 ) and a final passageway ( 74 ), the flow sections of the passageways ( 71 ,  72 ,  73 ,  74 ) decreasing from one passageway to the other from the initial passageway ( 71 ) towards the final passageway ( 74 ). 
     
     
         3 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 2 , in which the flow section of the initial passageway ( 71 ) is between 40% and 60% larger than the flow section of the final passageway ( 74 ). 
     
     
         4 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 1 , comprising four passageways ( 71 ,  72 ,  73 ,  74 ), further defined as a first passageway ( 71 ), a second passageway ( 72 ), a third passageway ( 73 ) and a fourth passageway ( 74 ), with the first passageway ( 71 ) being connected to an inlet ( 42 ) into the circuit ( 8 ), the second passageway ( 72 ) being connected to the first passageway ( 71 ), the third passageway ( 73 ) being connected to the second passageway ( 72 ) and the fourth passageway ( 74 ) being connected, on the one hand, to the third passageway ( 73 ) and, on the other hand, to an outlet from the circuit ( 40 ). 
     
     
         5 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 4 , in which the flow section of the first passageway ( 71 ) is between 5% and 15% larger than the flow section of the second passageway ( 72 ). 
     
     
         6 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 4 , in which the flow section of the second passageway ( 72 ) is between 20% and 40% larger than the flow section of the third passageway ( 73 ). 
     
     
         7 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 4 , in which the flow section of the third passageway ( 73 ) is between 5% and 15% larger than the flow section of the fourth passageway ( 74 ). 
     
     
         8 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 4 , in which a distance between margins ( 38 ,  60 ) defining the first passageway ( 71 ) is between 30 mm and 35 mm, a distance between margins ( 60 ,  60 ′) defining the second passageway ( 72 ) is between 27 mm and 32 mm, a distance between margins ( 60 ,  60 ′) defining the third passageway ( 73 ) is between 22 mm and 25 mm and/or a distance between margins ( 60 ,  38 ) defining the fourth passageway ( 74 ) is between 20 mm and 23 mm. 
     
     
         9 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 1 , inside which the passageways ( 71 ,  72 ,  73 ,  74 ) comprise baffles ( 52 ) for the flow of the fluid. 
     
     
         10 . A heat exchanger ( 1 ), for a motor vehicle, the heat exchanger ( 1 ) comprising plates ( 4 ) as claimed in  claim 1 , with at least two of the plates ( 4 ) being stacked one on top of the other in a pair of plates, such that the circuit ( 8 ) of one of the two plates ( 4 ) is a minor-image of the circuit ( 8 ) of the other of the two plates ( 4 ). 
     
     
         11 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 2 , comprising four passageways ( 71 ,  72 ,  73 ,  74 ), further defined as a first passageway ( 71 ), a second passageway ( 72 ), a third passageway ( 73 ) and a fourth passageway ( 74 ), with the first passageway ( 71 ) being connected to an inlet ( 42 ) into the circuit ( 8 ), the second passageway ( 72 ) being connected to the first passageway ( 71 ), the third passageway ( 73 ) being connected to the second passageway ( 72 ) and the fourth passageway ( 74 ) being connected, on the one hand, to the third passageway ( 73 ) and, on the other hand, to an outlet from the circuit ( 40 ). 
     
     
         12 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 5 , in which the flow section of the second passageway ( 72 ) is between 20% and 40% larger than the flow section of the third passageway ( 73 ). 
     
     
         13 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 12 , in which the flow section of the third passageway ( 73 ) is between 5% and 15% larger than the flow section of the fourth passageway ( 74 ). 
     
     
         14 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 5 , in which a distance between margins ( 38 ,  60 ) defining the first passageway ( 71 ) is between 30 mm and 35 mm, a distance between margins ( 60 ,  60 ′) defining the second passageway ( 72 ) is between 27 mm and 32 mm, a distance between margins ( 60 ,  60 ′) defining the third passageway ( 73 ) is between 22 mm and 25 mm and/or a distance between margins ( 60 ,  38 ) defining the fourth passageway ( 74 ) is between 20 mm and 23 mm. 
     
     
         15 . The plate ( 4 ,  12 ,  14 ) as claimed in  claim 2 , inside which the passageways ( 71 ,  72 ,  73 ,  74 ) comprise baffles ( 52 ) for the flow of the fluid.