HEATING ELEMENT WITH POWER CONTROL FOR LIQUIDS Russian patent published in 2010 - IPC H05B1/00 

FIELD: electricity.

SUBSTANCE: heating element with controlled power for liquids includes housing, disconnecting device coupled with temperature sensor and mains. The housing of heating element is made of stainless steel in the form of truncated cone or part of sphere and installed up side down and represented as a vessel bottom. Insulating glass ceramic layer is located on the outer surface. Apart from the lower cone cross section or top part of the sphere having cross section diametre no more than 20% of large diametre of heating element bottom, metal ceramic resistor (7) with temperature sensor (8) is installed on the outer surface. There is a shield inside truncated cone or part of sphere, which is made from sheet material capable of withstanding liquid boiling temperature and ensure permanent clearance no less than 3 mm between heating element surface contacting liquid and shield. In addition, there is an opening in the top part of the shield (4), which diametre coincides the diametre of the part of heating element, which is not covered with resistance layer. The electrical diagram of heating element includes unit (9), which controls power of heating element (7) regulated by temperature sensor (8), installed on the surface of metal ceramic resistor (7).

EFFECT: exclusion of liquid boiling on thermal element surface, exclusion of counter current hot and cold liquid flows crossing in heating element, increased rate of liquid heating, energy conservation during liquid heating, reduced noise levels and scale formation on thermal element surface during liquid heating.

3 dwg