Electric fluid heater

Abstract

An electric fluid heater includes a fluid-conducting housing in which at least one tubular heating element each with a plurality of coils is arranged. An inner region extends along a coil axis and is delimited by the coils. A displacer body arrangement with at least one displacer body is provided in the inner region, wherein a flow region for the fluid is formed on the outer circumference of the displacer body arrangement. The coils are also arranged in the flow region. An interior space arrangement with at least one interior space of the displacer body arrangement is separated from the flow region of the fluid largely or completely in a fluid-tight manner. A transverse flow is very substantially or completely avoided.

What is claimed is: 
     
         1 . An electric fluid heater comprising a fluid-conducting housing in which a plurality of coils of at least one tubular heating element are arranged, wherein an inner region of the fluid-conducting housing is delimited by the plurality of coils, wherein a displacer body arrangement in the inner region comprising at least one displacer body is arranged, and wherein a flow region for a fluid in which the plurality of coils are arranged is formed at an outer circumference of the displacer body arrangement. 
     
     
         2 . The electric fluid heater according to  claim 1 , wherein the displacer body arrangement bears against the plurality of coils. 
     
     
         3 . The electric fluid heater according to  claim 1 , wherein the fluid-conducting housing has two opposite housing end walls which are formed on a trough-like housing part that is closed by a housing lid. 
     
     
         4 . The electric fluid heater according to  claim 3 , wherein the displacer body arrangement extends over at least 90% of a distance of the two opposite housing end walls. 
     
     
         5 . The electric fluid heater according to  claim 3 , wherein the displacer body arrangement bears against the two opposite housing end walls. 
     
     
         6 . The electric fluid heater according to  claim 1 , wherein the at least one displacer body is a tube. 
     
     
         7 . The electric fluid heater according to  claim 6 , wherein the tube has at least one diameter reduction or constriction. 
     
     
         8 . The electric fluid heater according to  claim 6 , wherein the is cylindrical. 
     
     
         9 . The electric fluid heater according to  claim 3 , wherein the at least one displacer body is a tube, wherein the tube has one or two end-face lids each of which faces one of the two opposite housing end walls, or wherein the tube includes at least one inner partition. 
     
     
         10 . The electric fluid heater according to  claim 1 , wherein the displacer body arrangement includes two or more displacer bodies. 
     
     
         11 . The electric fluid heater according to  claim 10 , wherein the two or more displacer bodies are cups, each of the cups having a bottom. 
     
     
         12 . The electric fluid heater according to  claim 1 , wherein the at least one displacer body includes plural longitudinal ribs distributed around a circumference or a cover. 
     
     
         13 . The electric fluid heater according to  claim 1 , wherein the at least one displacer body has at least one opening through which the fluid can penetrate into and fill a rest chamber for the fluid formed inside the displacer body arrangement or the at least one displacer body. 
     
     
         14 . The electric fluid heater according to  claim 13 , wherein the at least one opening is an oblong hole or a slit, which is arranged approximately in parallel to a coil axis and/or is introduced into a cover of the at least one displacer body. 
     
     
         15 . The electric fluid heater according to  claim 9 , wherein the at least one displacer body has at least one opening through which the fluid can penetrate into and fill a rest chamber for the fluid formed inside the displacer body arrangement or the at least one displacer body, and wherein the at least one openings is arranged at the one or two end-face lids of the tube or in the at least one inner partition. 
     
     
         16 . The electric fluid heater according to  claim 11 , wherein the at least one displacer body has at least one opening through which the fluid can penetrate into and fill a rest chamber for the fluid formed inside the displacer body arrangement or the at least one displacer body, and wherein the at least one opening is arranged on a bottom of a cup.