HOT-WATER BOILER Russian patent published in 2011 - IPC F24H1/00 

FIELD: heating.

SUBSTANCE: boiler includes radiant burner for combustion of gaseous or liquid fuel, and vertical cylindrical housing with distributing chamber of hot flue gases, collecting chamber of cooled flue gases and inlet and outlet branch pipes of working media. Along vertical axis of housing there in-series arranged in flue gas direction is water heater and air heater, each of which consists of two or more heat exchange units, as well as peripheral and central headers. Heat exchange unit is assembled around vertical axis of housing in the from of annular row of heat transfer elements with radial spiral slot channels for movement of heated media (water and air) and vertical slot channels of spiral-shaped section for movement of heating medium - flue gas. Between adjacent heat exchange units of each of heaters in peripheral and central headers there installed in turn are horizontal partitions which guide water and air flows subsequently from one heat exchange unit to the next unit.

EFFECT: reduction of metal consumption and overall dimensions of boiler, and decrease of fuel consumption.

3 cl, 4 dwg