Patent ID: 9664414
Date: 2017-05-30
CPC Classifications: A47J,F24H

Claim:
1. A fluid heater of the continuous flow type, the fluid heater being configured to be used within a household appliance, the fluid heater comprising: a fluid channel having at least one first fluid channel section, at least one substantially cylindrical metal pipe, a heating device having at least one tubular heating element positioned outside the metal pipe, and a heat conducting plate surrounding the metalpipe in a circumferential direction for distributing the heat from the heating device to regions of the metal pipe in contact with the heat conducting plate, a fluid guiding core which is disposed in the metal pipe and which forms the first fluid channel section between the metal pipe and the fluid guiding core, and a first fluid connector for fluid supply means and a second fluid connector for fluid discharge means, which are in communication with the respective ends of the fluid channel, wherein the first fluid channel section runs substantially helically in the form of a groove in an outer surface of the fluid guiding core and the first fluid channel section forms a flow path for the fluid with a hydraulic length, and wherein the fluid guiding core has a cylindrical core and a helix disposed thereon which forms a first fluid guiding channel section running helically around the fluid guiding core, wherein the core has at least one substantially conical end which partially projects into a substantially funnel-shaped opening of the corresponding fluid connector, wherein an apex angle of the conical end of the core is selected such that a substantially constant flow cross-section results in the funnel-shaped opening from an orifice to a transition to a fluid connector.