TRANSFORMER-TYPE ELECTRIC WATER HEATER Russian patent published in 2004 - IPC

FIELD: fast water heating appliances. SUBSTANCE: device has three-phase laminated electric steel core whose legs carry aluminum wire primary winding. Short-circuited single-turn secondary winding of nonmagnetic electricity conducting tubes functions as heating element. Novelty is that secondary winding is specifically designed so that short-circuited turn in each of its phases has active and passive sections. Active section is placed directly on phase leg of transformer core and passive section placed around same phase leg of transformer core is made in the from of two parallel conductors connected at their ends to active section. Short-circuited turns of phases are connected in series with respect to water flow and are shorted out by welds. Such design meets to advantage specific requirements to short- circuited secondary windings. EFFECT: enhanced safety and operating reliability. 1 cl, 2 dwg