ELECTRODE FOR ELECTRODE-TYPE WATER BOILER Russian patent published in 2001 - IPC

FIELD: off-line heating and hot-water supply for cottages, industrial and servicing premises, and the like. SUBSTANCE: some sections of sectionalized electrode, say, sections 2 and 3, are made of several layers in cross-sectional area one of them being posistor layer 6 adjusted to desired change-over temperature corresponding to permissible heating temperature of liquid. Other sections, say, section 1, do not have posistor layer. Liquid is first heated by current passed through all sections 1, 2, and 3. Increase in liquid temperature to permissible value corresponding to change-over setting temperature first cuts off posistor layer of section 3, then that of section 2 and further operation of these sections will be possible only after liquid cools down to definite temperature. Section 1 operates continuously to ensure permanent liquid circulation in system. EFFECT: provision for automatic-control operation of system under preset conditions. 3 cl, 3 dwg