Stacked plate heat exchanger

Abstract

The stacked plate oil cooler has a first plate and a second plate. Both the first plate and the second plate are made of a three-layered aluminum alloy clad sheet. The second plate is folded at an outer rim to place the brazing material layer on both sides of the second plate. The first and second plates and are stacked alternately and brazed to define a water passage between sacrificial layers and, and to define an oil passage between brazing material layers. The first plate is folded at an outer rim to place the sacrificial layer on a lateral outside of a core assembly to decrease exposure of the brazing material layer to the lateral outside.

1 . A stacked plate heat exchanger for a first medium and a second medium having a core section including alternately stacked first plates and second plates, each of the first and second plates being made of a three-layered plate having a core layer, a sacrificial layer formed on one side of the core layer, and a brazing material layer formed on the other side of the core layer, comprising:
 a first tapered portion formed on an outer rim of each of the first plates, being enlarged toward an opening, the first tapered portion including a first folded portion formed by bending an outer rim of the first plate to place the sacrificial layer on the first plate outside the first tapered portion; and   a second tapered portion formed on an outer rim of each of the second plates, wherein   the first plates and the second plates are stacked alternately to define first passages for the first medium between the sacrificial layers on the first plate and the second plate, and to define second passages for the second medium between the brazing material layers on the first plate and the second plate; and wherein   the first tapered portion and the brazing material layer on the second tapered portion are placed next to each other.   
   
   
       2 . The stacked plate heat exchanger claimed in  claim 1 , wherein the second tapered portion is enlarged toward an opening. 
   
   
       3 . The stacked plate heat exchanger claimed in  claim 1 , wherein the first plate has a corner portion on the outer rim, and the corner portion has a recess extending at least along the first folded portion. 
   
   
       4 . The stacked plate heat exchanger claimed in  claim 1 , wherein the second tapered portion includes a second folded portion formed by bending an outer rim of the second plate to place the brazing material layer on the second plate outside the second tapered portion. 
   
   
       5 . The stacked plate heat exchanger claimed in  claim 4 , wherein the second tapered portion has a brazing passage corresponding to the second folded portion to introduce brazing material to an interface between the sacrificial layers on the second plate. 
   
   
       6 . The stacked plate heat exchanger claimed in  claim 4 , wherein the second plate has a corner portion on the outer rim, and the corner portion has a recess extending at least along the second folded portion. 
   
   
       7 . The stacked plate heat exchanger claimed in  claim 1 , wherein the first fluid is cooling water. 
   
   
       8 . The stacked plate heat exchanger claimed in  claim 1 , wherein the second fluid is oil. 
   
   
       9 . The stacked plate heat exchanger claimed in  claim 1 , wherein the core layer of the first and second plates are made of aluminum alloy. 
   
   
       10 . The stacked plate heat exchanger claimed in  claim 1 , wherein
 the first plates and the second plates are stacked alternately to place the brazing material layer on the first plate on one end of a core assembly, and to place the brazing material layer on the second plate on the other end of the core assembly, and are stacked to have at least one combination of the first plate and the second plates stacked on both sides of the first plate in which the sacrificial layer placed on both sides of the first tapered portion of the first plate are brazed with the brazing material layers on the second tapered portions of the second plates respectively, and further comprises:   a support plate brazed on the one end of the core assembly by the brazing material on the brazing material layer on the first plate, and   a cover plate brazed on the other end of the core assembly by the brazing material on the brazing material layer on the second plate.   
   
   
       11 . The stacked plate heat exchanger claimed in  claim 1 , wherein
 the first plates and the second plates are stacked alternately to place the brazing material layer on the first plate on one end of a core assembly, and to place the brazing material layer on the second plate on the other end of the core assembly, and are stacked to have at least one combination of the first plate and the second plates stacked on both sides of the first plate in which the sacrificial layer placed on both sides of the first tapered portion of the first plate is brazed with the brazing material layer on the second tapered portion of one of the second plate, and the blazing material layer placed on the first tapered portion of the first plate is brazed with the brazing material layer on the second tapered portion of the other one of the second plate, and further comprises:   a support plate brazed on the one end of the core assembly by the brazing material on the brazing material layer on the first plate, and   a cover plate brazed on the other end of the core assembly by the brazing material on the brazing material layer on the second plate.   
   
   
       12 . The stacked plate heat exchanger claimed in  claim 1 , wherein
 the first plates and the second plates are stacked alternately to place the brazing material layer on the first plate on one end of a core assembly, and to place the brazing material layer on the second plate on the other end of the core assembly, and are stacked to have at least one combination of the second plate and the first plates stacked on both sides of the second plate in which the sacrificial layer placed on the first tapered portion of one of the first plate is brazed with the brazing material layer on the first tapered portion of the other one of the first plate, and the sacrificial layer placed on the first tapered portion of the other one of the first plate is brazed with the brazing material layer placed on the second tapered portion of the second plate, and further comprises:   a support plate brazed on the one end of the core assembly by the brazing material on the brazing material layer on the first plate, and   a cover plate brazed on the other end of the core assembly by the brazing material on the brazing material layer on the second plate.   
   
   
       13 . The stacked plate heat exchanger claimed in  claim 1 , wherein the first tapered portion is formed into a U-turn shape. 
   
   
       14 . A stacked plate heat exchanger for a first medium and a second medium having a core section including alternately stacked first plates and second plates, each of the first and second plates being made of a three-layered plate having a core layer, a sacrificial layer formed on one side of the core layer, and a brazing material layer formed on the other side of the core layer, comprising:
 a first tapered portion formed on an outer rim of each of the first plates, being enlarged toward an opening; and   a second tapered portion formed on an outer rim of each of the second plates, the second tapered portion including a second folded portion formed by bending an outer rim of the second plate into a U-turn shape to place the brazing material layer on the second plate outside the second tapered portion wherein   the first plates and the second plates are stacked alternately to define first passages for the first medium between the sacrificial layers on the first plate and the second plate, and to define second passages for the second medium between the brazing material layers on the first plate and the second plate; and wherein   the first tapered portion and the brazing material layer on the second tapered portion are placed next to each other.