HEATING COIL WITH PROTECTION AGAINST PRIMARY SCALE (VERSIONS) Russian patent published in 2010 - IPC H05B3/48 

FIELD: electric engineering.

SUBSTANCE: invention has a property to prevent formation of salt deposits (scale) on its shell, in process of water heating and boiling. Heating coil may be used to produce various electric water heaters using heating coils. Heating coil with its own protection against primary scale comprises heating element in the form of bent spiral, ends of which are connected to contact rods, pressed together with them and filler into ferromagnetic shell, sealed at the ends, and equipped with electric insulators and elements of fixation to water heater body at the ends, and generator of magnetic field, such as spiral of heating element, specified spiral of heating element is arranged of at least two adjacent identical sections, adjacent sections of spiral have opposite directions of winding. In other version adjacent sections have identical directions of winding and are separated from each other by means of rectilinear or zigzag-bent section made of the same conductor as spiral. Inside turns of each section there is a ferromagnetic rectilinear rod inserted.

EFFECT: prolonged service life of heating coils with a considerable increase of their application temperature.

4 cl, 6 dwg