Fatigue-proof plate heat exchanger

Abstract

Plate heat exchanger for indirect heat exchange between at least two liquid and/or gaseous media with an essentially parallelepiped-shaped base ( 8 ), means for feeding and removing the media (headers 6, 6 a, 7 ), and a number of passages ( 14 ), arranged essentially like stacks, for indirect heat exchange between media that respectively flow into adjacent passages ( 14 ), whereby the passages are formed by partitions ( 1, 22 ) that are spaced some distance apart, whereby the partitions are spaced some distance apart by end strips ( 4 a, 4 b), the passages have a corrugated profile (fins, 2 ), which is in heat-conductive contact with the partitions ( 1, 22 ) at its wave peaks and wave troughs, and the stack is closed off by a cover plate ( 5, 21 ), characterized in that the ratio between the width of the partition (B) and the repetition interval of the same characteristic of the corrugated profile as, for example, the repetition interval of two wave peaks (wavelength, LP) has a value in the range of between 15 and 80.

1 . In a plate heat exchanger for indirect heat exchange between at least two liquid and/or gaseous media with an essentially parallelepiped-shaped base ( 8 ), means for feeding and removing the media (headers  6 ,  6   a,    7 ), and a number of passages ( 14 ), arranged essentially like stacks, for indirect heat exchange between media that respectively flow into adjacent passages ( 14 ), whereby the passages are formed by partitions ( 1 ,  22 ) that are spaced some distance apart, whereby the partitions are spaced some distance apart by end strips ( 4   a,    4   b ), the passages have a corrugated profile (fins,  2 ), which is in heat-conductive contact with the partitions ( 1 ,  22 ) at its wave peaks and wave troughs, and the stack is closed off by a cover plate ( 5 ,  21 ), the improvement wherein the ratio between the width of the partition (B) and the repetition interval of the same characteristic of the corrugated profile ( 2 ) as, for example, the repetition interval of two wave peaks (wavelength, LP) has a value in the range of between 15 and 80. 
     
     
         2 . A plate heat exchanger according to  claim 1 , wherein the ratio between the width of the partition (B) and wavelength (LP) has a value in the range of between 20 and 60. 
     
     
         3 . A plate heat exchanger according to  claim 1 , wherein the ratio between the width (B) and the thickness of the partition is less than 150. 
     
     
         4 . A plate heat exchanger according to  claim 3 , wherein the ratio between the width (B) and the thickness of the partition has a value in the range of between 50 and 150. 
     
     
         5 . A plate heat exchanger according to  claim 1 , wherein the ratio of height difference (HP) between the highest point of a wave peak and the lowest point of a wave trough (fin height) to the material thickness (fin thickness, SP) of the corrugated profile ( 2 ), in passages ( 14 ) through which oil may flow as a medium, has a value in the range of between 7 and 80. 
     
     
         6 . A plate heat exchanger according to  claim 1 , wherein the ratio between fin height (HP) and fin thickness (SP), in passages ( 14 ) through which oil flows as a medium, has a value in the range of between 8 and 20. 
     
     
         7 . A plate heat exchanger for indirect heat exchange between at least two liquid and/or gaseous media with an essentially parallelepiped-shaped base ( 8 ), means for feeding and removing the media (headers  6 ,  6   a,    7 ), and a number of passages ( 14 ), arranged essentially like stacks, for indirect heat exchange between media that respectively flow into adjacent passages, whereby the passages ( 14 ) are formed by partitions ( 1 ,  22 ) that are spaced some distance apart, whereby the partitions ( 1 ,  22 ) are spaced some distance apart by end strips ( 4   a,    4   b ), and the stack is closed off by a cover plate ( 5 ,  21 ), wherein the end strip ( 4   a,    4   b ) has a bottom side and three blades that are perpendicular to it, whereby the three blades are oriented in such a way that they face the interior of the parallelepiped-shaped base, and the middle of the three blades is longer than the outer two blades. 
     
     
         8 . A method of cooling oil or air, comprising providing a heat exchanger according to  claim 1  and passing oil or air there through in indirect heat exchange with a heat exchange medium. 
     
     
         9 . A plate heat exchanger according to  claim 2 , wherein said ratio is between 28 and 50. 
     
     
         10 . A plate heat exchanger according to  claim 2 , wherein said ratio is between 29 and 43. 
     
     
         11 . A plate heat exchanger according to  claim 4 , wherein said ratio is between 75 and 115. 
     
     
         12 . A plate heat exchanger according to  claim 4 , wherein said ratio is between 80 and 105. 
     
     
         13 . A plate heat exchanger according to  claim 6 , wherein said range is between 10 and 15. 
     
     
         14 . A plate heat exchanger according to  claim 1 , wherein the ratio of the height difference between the highest point of a wave peak and the lowest point of a wave trough (fin height) to the material thickness of the corrugated profile (fin thickness) is in the range of between 7 and 80 in passages through which oil flows as a medium. 
     
     
         15 . A plate heat exchanger according to  claim 14 , wherein, the ratio between fin height and fin thickness is in the range of between 8 and 20, through which oil flows as a medium. 
     
     
         16 . A plate heat exchanger according to  claim 14 , wherein, the ratio between fin height and fin thickness is in the range of between 10 and 15, in passages through which oil flows as a medium.