Exhaust gas evaporator

Abstract

An evaporator, in particular an exhaust gas evaporator for an exhaust gas system of a motor vehicle, is provided that includes a plate sandwich structure having a plurality of fluid-guiding plate elements stacked on top of one another for guiding a first fluid, wherein at least one rib, in particular a corrugated rib, is disposed between two plate elements for guiding a second fluid, wherein a plate element comprises at least one cover element covering a flow channel and a flow channel plate unit, wherein the flow channel plate unit comprises at least one flow channel plate having flow channels in order to guide the first fluid from an inlet to an outlet.

What is claimed is: 
     
         1 . An evaporator for an exhaust gas system of a motor vehicle, the evaporator comprising:
 a plate sandwich structure that has multiple fluid-guiding plate elements stacked on top of each other for guiding a first fluid;   at least one rib arranged between two plate elements and configured to guide a second fluid; and   a plate element having at least one cover plate covering a flow channel and a flow channel plate unit, the flow channel plate unit having at least one flow channel plate provided with flow channels in order to guide the first fluid from an inlet to an outlet.   
     
     
         2 . The evaporator according to  claim 1 , wherein the flow channel plate unit includes a single flow channel plate, and wherein the flow channel plate is closed by a cover plate covering a flow channel. 
     
     
         3 . The evaporator according to  claim 2 , wherein another cover plate is arranged between the single flow channel plate and the at least one rib so that the flow channel plate is arranged between the two cover plates ( 11 ). 
     
     
         4 . The evaporator according to  claim 3 , wherein the flow channel plate unit includes exactly two flow channel plates that are arranged between two cover plates. 
     
     
         5 . The evaporator according to  claim 1 , wherein the flow channels are provided viaan embossing process or a deep drawing process. 
     
     
         6 . The evaporator according to  claim 4 , wherein the flow channels of the flow channel plates are designed as openings, the openings in the two flow channel plates overlapping to form one or multiple flow channels. 
     
     
         7 . The evaporator according to  claim 6 , wherein the widths of the overlapping openings are different. 
     
     
         8 . The evaporator according to  claim 6 , wherein the openings are provided by a stamping process, laser cutting or water jet cutting. 
     
     
         9 . The evaporator according to  claim 1 , wherein the inlet and/or the outlet is/are situated in a central area of the evaporator. 
     
     
         10 . The evaporator according to  claim 1 , wherein the inlet and/or the outlet is/are situated on a side of the evaporator. 
     
     
         11 . The evaporator according to  claim 1 , wherein at least one flow channel plate unit has an element that is designed to generate an elevated pressure loss, the element being designed as a nozzle, aperture or labyrinth. 
     
     
         12 . The evaporator according to  claim 1 , wherein the flow channels have a meander-shaped structure. 
     
     
         13 . The evaporator according to  claim 1 , wherein the flow channels are formed by parallel seams which are connected to each other by openings. 
     
     
         14 . An exhaust gas system for a motor vehicle comprising an exhaust gas evaporator according to  claim 1 . 
     
     
         15 . The exhaust gas system according to  claim 14 , wherein the exhaust gas evaporator is configured to be thermally coupled to a Rankine cycle. 
     
     
         16 . The evaporator according to  claim 1 , wherein the at least one rib is a connecting rib or a corrugated rib.