HOT-WATER BOILER Russian patent published in 2001 - IPC

FIELD: heating water in heating systems and hot-water supply systems heat-power engineering. SUBSTANCE: boiler has fire tubes and water chamber combined in two self-contained units: inner unit and outer unit interconnected by means of flange joint. Water chamber is made in from of system of heat-exchange tubes communicated through system of curvilinear nozzles which are mounted tangentially. Each nozzle is made in form of slotted diffuser passage on side of water outlet. Fire tubes are mounted inside heat- exchange tubes; fire tubes of inner and outer units are communicated by means of circulating chambers forming three-way draft system. On side of outer surface, fire tubes are provided with helical guide strips and on side of inner surface, fire tubes are provided with double-start helical thread forming ridges of varying height and reversible twisting of flow of combustion products inside fire tubes. On side of header, heat-exchange tubes are provided with blanks having cuts for communication of heat-exchange tubes with header. EFFECT: increased specific output of boiler. 6 dwg