HOT-WATER BOILER Russian patent published in 2001 - IPC

FIELD: heating and hot-water supply systems. SUBSTANCE: boiler has a body with furnace and flue, side and intermediate screens which tubes are coupled to lower and upper water headers included longitudinal tubes with partitions dividing them into segments. Screens are provided with fins. Tubes of side screens contain upper sections inclined to center of furnace. Fins are provided on lower vertical sections of side screens and upper sections of auxiliary screens positioned on level of inclined sections of side screens. Screen sections with fins form labyrinth gas ducts with turning chambers. Boiler is provided with auxiliary screens arranged between turning chamber output and flue. Screen tubes are coupled to water headers by means of transverse tubes jointed to segments of longitudinal tubes. Segments of upper longitudinal tubes are shifted in axial direction relative to segments of lower longitudinal tube by one pitch of transverse tube. Boiler construction provides for enhanced efficiency due to improvement of boiler heat-exchange properties. EFFECT: enhanced convenience of operation. 2 cl, 4 dwg