Device for heat exchange between flowable media

Abstract

The invention relates to a device for heat exchange between flowable media. Said device comprises a heat exchanger block which is defined, on one side, by an inflow chamber ( 1 ) for supplying the liquid medium, and on the other side, by an outflow chamber ( 3 ) for evacuating the liquid medium. Said block comprises fluid channels ( 7 ) for the liquid medium, extending through the block from the inflow chamber ( 1 ) to the outflow chamber ( 3 ), and a covering plate ( 9 ) which extends from the inflow chamber ( 1 ) to the outflow chamber ( 3 ) and closes the block at one end. Said covering plate ( 9 ) is provided with at least one inner passage ( 13 ) which extends from the inflow channel ( 1 ) to the outflow channel ( 3 ) as a bypass flow channel bypassing the fluid channels ( 7 ). Said passage can be blocked by means of at least one pressure limitation device ( 11 ), and unblocked by opening said pressure limitation device ( 11 ) as a result of a pressure difference between the inflow chamber ( 1 ) and the outflow chamber ( 3 ), which exceeds a pre-determined threshold value.

1 . A device for heat exchange between flowable media, at least one of which is in the fluid state, having a heat exchanger block, which is bounded on one side by an inlet chamber ( 1 ) and on the opposite side by a outlet chamber ( 3 ) for intake and discharge of the fluid medium, having fluid paths ( 7 ) for the fluid medium which extend through the block from the inlet chamber ( 1 ) to the outlet chamber ( 3 ) and which are separated from each other by flow paths positioned between them for conveyance of the other medium capable of flow, and having a cover plate ( 9 ), which, covering the fluid paths ( 7 ) and flow paths ( 8 ), extend from the inlet chamber ( 1 ) to the outlet chamber ( 3 ), characterized in that the cover plate ( 9 ) has at least one interior passage ( 13 ) which, bypassing the fluid paths ( 7 ), extends as bypass channel from the inlet chamber ( 1 ) to the outlet chamber ( 3 ), may be blocked by at least one pressure control mechanism ( 11 ), and may be unblocked by opening of the mechanism ( 11 ) on the basis of a differential pressure exceeding a predetermined threshold value and prevailing between inlet chamber ( 1 ) and outlet chamber ( 3 ).  
   
   
       2 . The device as claimed in  claim 1 , wherein a section of a hollow cast element in the form of a flat tube ( 9 ) formed by extrusion is provided, which is closed at both ends by a sealing plate ( 15 ).  
   
   
       3 . The device as claimed in  claim 2 , wherein through bores ( 17 ,  19 ) are formed in the wall of the flat tube ( 9 ) in the end areas adjoining the inlet chamber ( 1 ) and outlet chamber ( 3 ), which through bores ( 17 ,  19 ) form a fluid connection between at least one passage ( 13 ) of the flat tube ( 9 ) and the inlet chamber ( 1 ) and the outlet chamber ( 3 ).  
   
   
       4 . The device as claimed in  claim 3 , wherein the flat tube ( 9 ) has two interior passages ( 13 ) each of which is connected by way of through bores ( 17 ,  19 ) to the inlet chamber ( 1 ) and/or the outlet chamber ( 3 ).  
   
   
       5 . The device as claimed in  claim 4 , wherein at least one pressure control mechanism ( 11 ) is provided for each passage ( 13 ) of the flat tube ( 9 ).  
   
   
       6 . The device as claimed in  claim 3 , wherein the pressure control mechanism ( 11 ) is mounted for each passage ( 13 ) in a through bore ( 17 ,  19 ) extending through the wall of the flat tube ( 9 ).  
   
   
       7 . The device as claimed in  claim 6 , wherein pressure control mechanisms ( 11 ) are provided in the through bore ( 19 ) connecting the passage ( 13 ) to the outlet chamber ( 3 ).  
   
   
       8 . The device as claimed in  claim 1 , wherein a return valve ( 11 ) in the form of a spring-loaded seat valve is provided as pressure control mechanism.  
   
   
       9 . The device as claimed in  claim 8 , wherein there is configured in the wall of each passage ( 13 ), in the area opposite the return valve ( 11 ), an access bore ( 23 ) which may be closed off by a sealing component ( 23 ) and which permits access to the valve ( 11 ).  
   
   
       10 . The device as claimed in  claim 2 , wherein a passageway ( 21 ) forming a fluid connection between the passages ( 13 ) is formed in the sealing plates ( 15 ) closing off the ends of the flat tube ( 9 ).  
   
   
       11 . The device as claimed in  claim 10 , wherein the passageway of the sealing plates ( 15 ) is in the form of an elongated groove ( 21 ) made in such sealing plates ( 15 ) which extends over the ends of the passages ( 13 ) present in the flat tube ( 9 ).  
   
   
       12 . The device as claimed in  claim 1 , wherein the respective pressure control mechanism ( 11 ) consists of a sealing component actuated by means of pressure and/or temperature.