GAS-FIRED WATER-HEATING BOILER Russian patent published in 2003 - IPC

FIELD: water heating equipment, possibly heating and hot water supply systems. SUBSTANCE: boiler includes casing, fire box, heat exchanger, gas receptacle, gas pipeline, system for automatic control, for safety and for manual control. Working burners are made of steel, they have slit-like grooves arranged in pairs by three rows in staggered fashion and distributed along width of fire box in such a way that their housings form distribution grate. Areas of slits of said grate may provide uniform temperature field in the whole volume of fire box. Ignition burner is mounted with inclination angle under working burners and it has fire bridge extended by 1/3 of fire surface of working burners at side of their nozzles. Modules of heat exchanger are made of cast iron with circular heating surface and they are mutually joined in such a way that their lateral ribs define gas ducts. Lateral walls of each module are mutually joined by means of rods. Flue pipe is provided with controlled draft stabilizer. System for automatic control and safety includes pneumatic pickup for detecting flame in ignition burner, electric and pneumatic draft pickups, electric and pneumatic pickups for detecting flame going onto cut of nozzles of working burners; main and additional shutoff valves operating at clogging up gas duct inside boiler; water temperature regulator and handle "start" (said valves, temperature regulator and handle form united control device together with control and safety pickups); temperature control unit designed for monitoring preset air temperature in heated room and connected with electromagnetic valve, electric motor of circulation pump of heating system and with exhaust fan; cock for manual control of boiler operation according to temperature of heat transfer agent; safety valve operating according to pressure of heat transfer agent at air reducing from heating system being filled. Electromagnetic valve is mounted on pulse tube connecting temperature regulator with main shutoff valve and it is bypassed with line parallel relative to cock for manual control of boiler operation according to temperature of heat transfer agent. EFFECT: enhanced operational effectiveness and reliability of boiler. 2 cl, 6 dwg