Heating device in a water-bearing domestic appliance

Abstract

The invention relates to a heating device for heating a liquid flow (I) in a water-bearing domestic appliance. According to the invention, the heating device has a heat pipe having a heat-absorbing evaporator section and a heat-outputting condenser section that is in thermal connection with the liquid flow (I).

1 . A heating device for heating a fluid flow, in particular a liquid flow (I), in a water-conducting domestic appliance, wherein the heating device has a heat pipe with a heat-absorbing evaporator section and a heat-emitting condenser section, which is connected thermally to the liquid flow (I). 
     
     
         2 . The heating device as claimed in  claim 1 , wherein the heat pipe has a liquid passage through which the liquid (I) flows, which extends through the radially outer heat pipe and/or the heat pipe delimits a space which is closed in a fluid-tight manner, in which a working fluid is provided, with which heat is transported from the heat-absorbing section to the heat-emitting section of the heat pipe. 
     
     
         3 . The heating device as claimed in  claim 1 , wherein the heat-emitting section of the heat pipe has a heat transfer surface for transferring heat from the space in the heat pipe which is closed in a fluid-tight manner to the liquid flow (I). 
     
     
         4 . The heating device as claimed in  claim 1 , wherein that the heating device is embodied as a twin-walled pipe, with an outer pipe forming the heat pipe, an inner pipe forming the liquid passage and an annular gap in between, which is part of the space in the heat pipe which is closed in a fluid-tight manner. 
     
     
         5 . The heating device as claimed in  claim 1 , wherein the heat-absorbing evaporator section of the heat pipe has an in particular electrically actuatable heating element arranged in particular within the space in the heat pipe which is closed in a fluid-tight manner. 
     
     
         6 . The heating device as claimed in  claim 4 , wherein in a free surface configuration the inner pipe through which the liquid flows has a flow contour, in particular for example a bulged profile or undulating profile, and/or flow guide elements. 
     
     
         7 . The heating device as claimed in  claim 1 , wherein the heat pipe is embodied as a two-phase thermosiphon or a gravitation heat pipe, in which the space which is closed in a fluid-tight manner is divided into a collection space for the liquid working medium, which is at the bottom when fitted, and a vapor space into which the liquid working medium evaporates when heat is input and condenses at the heat transfer surface arranged in the vapor space while emitting heat and flows back to the collection space automatically due to gravity. 
     
     
         8 . The heating device as claimed in  claim 7 , wherein, to form the collection space, the outer pipe has a heat pipe housing that projects in a radially outward direction and delimits the collection space. 
     
     
         9 . The heating device as claimed in  claim 1 , wherein the inner pipe and outer pipe are connected to one another in a fluid-tight manner at their axially opposing faces, in particular are each joined at their end faces to form a twin-walled composite annular unit. 
     
     
         10 . The heating device as claimed in  claim 1 , wherein the heat pipe is arranged in a flow chamber of a pump and that in particular the pump has a blade wheel chamber with a blade wheel conveying the liquid as the flow chamber and a pressure chamber arranged downstream thereof. 
     
     
         11 . The heating device as claimed in  claim 10 , wherein the pressure chamber of the pump is delimited radially on the outside by the inner pipe of the twin-walled heating pipe and/or the outer pipe of the heating pipe is arranged within an outer cylindrical outer housing wall of the pump housing with an air gap in between. 
     
     
         12 . The heating device as claimed in  claim 11 , wherein the cylindrical housing wall of the pump housing has a cutout through which the housing delimiting the collection space of the heat pipe projects. 
     
     
         13 . The heating device as claimed in  claim 11 , wherein the cylindrical housing wall of the pump housing transitions into a radially inner cylindrical pump wall, which delimits the pressure chamber together with the inner pipe of the twin-walled heating pipe. 
     
     
         14 . A pump having a heating device as claimed in  claim 1 .