Heat exchanger with intermediate plate

Abstract

The present invention relates to a heat exchanger, in particular, an oil cooler for motor vehicles, constructed from trough-shaped heat exchanger plates which are stacked into one another and from turbulence inserts, having two openings for one medium and two further openings for another medium in order to form collecting ducts for the supply and discharge of the media, with flow ducts for the media being formed between the heat exchanger plates. The heat exchanger also includes flow ducts connected to the associated collecting ducts, an upper closure plate which has convexities in the region of the collecting tanks, and an intermediate plate which is provided with holes. The intermediate plate is arranged between the closure plate and the uppermost heat exchanger plate, and one of the holes, formed as a pressure equalizing opening, interacts with the upwardly aligned convexity in the closure plate to improve the internal pressure stability.

1 . A heat exchanger, in particular an oil cooler for motor vehicles, the heat exchanger comprising:
 a plurality of trough-shaped heat exchanger plates which are stacked into one another, each of the plurality of heat exchanger plates having two openings for one medium and two further openings for an other medium in order to form collecting ducts for the supply and discharge of the one media and the other media;   flow ducts for the media being formed between the heat exchanger plates, the flow ducts being connected to the associated collecting ducts;   turbulence inserts arranged in the flow ducts;   an upper closure plate which has convexities adjacent at least one of the collecting ducts; and   an intermediate plate which is provided with holes;   wherein the intermediate plate is arranged between the closure plate and an uppermost heat exchanger plate, and wherein one of the holes interacts, as a pressure equalizing opening, with the upwardly aligned convexity in the closure plate.   
   
   
       2 . The heat exchanger according to  claim 1 , wherein the upwardly aligned convexities of the closure plate have a spherical-cap-like profile. 
   
   
       3 . The heat exchanger according to  claim 2 , wherein the upwardly aligned convexities of the closure plate have a larger diameter than the collecting ducts. 
   
   
       4 . The heat exchanger according to  claim 1 , wherein a diameter of the holes in the intermediate plate is significantly smaller than a diameter of the collecting tank. 
   
   
       5 . The heat exchanger according to  claim 4 , wherein the diameter of the holes is between about 1 mm and about 2 mm. 
   
   
       6 . The heat exchanger according to  claim 1 , wherein the closure plate and the intermediate plate have different thicknesses. 
   
   
       7 . The heat exchanger according to  claim 6 , wherein the thickness of the closure plate is between about 1 mm and about 3 mm and the thickness of the intermediate plate is between about 1 mm and about 2 mm. 
   
   
       8 . The heat exchanger according to  claim 1 , wherein at least one of the turbulence inserts, in a region of the collecting tank in which the pressure equalizing opening is situated, is formed without an opening. 
   
   
       9 . The heat exchanger according to  claim 8 , wherein the turbulence insert includes at least one pressure equalizing opening. 
   
   
       10 . The heat exchanger according to  claim 1 , wherein a lowermost heat exchanger plate is formed from a thicker metal sheet than the other heat exchanger plates. 
   
   
       11 . The heat exchanger according to  claim 1 , further comprising a fastening plate of at least two-part design. 
   
   
       12 . The heat exchanger, in particular oil cooler for motor vehicles, the heat exchanger comprising:
 a plurality of trough-shaped heat exchanger plates stacked into one another and having two openings for one medium and two further openings for an other medium in order to form collecting ducts for the supply and discharge of the one media and the other media;   turbulence inserts;   flow ducts for the media formed between the heat exchanger plates and connected to the associated collecting ducts;   an intermediate plate which is provided with holes; and   a closure disk in the region of the collecting ducts and having a convexity which is connected to the intermediate plate;   wherein a diameter of the convexity is greater than a diameter of the collecting duct, and wherein the intermediate plate is arranged on an uppermost heat exchanger plate.   
   
   
       13 . The heat exchanger according to  claim 12 , wherein an inwardly aligned convexity is provided in a center of the convexity.