HEAT EXCHANGER OF LIQUID HEATING SYSTEM Russian patent published in 2013 - IPC F28D1/04 F24H1/00 

FIELD: heating.

SUBSTANCE: heat exchanger of a liquid heating system includes a housing with a cover plate with a burner installation seat; a flue interconnected with a turning flue gas header is connected on the opposite side. The flue forms together with the housing a liquid volume restricted with front and rear tube sheets with tubes fixed in them, which are uniformly located around the flue with gaps relative to the housing and the flue. Inlet pipe sections are directed into a turning header, and outlet pipe sections are directed into an annular flue gas header. Between end walls of the turning flue gas header and the housing there formed is an inlet liquid chamber interconnected with a liquid supply connection pipe. The end wall of the turning flue gas header is adjacent to periphery of front tube sheet and forms together with the housing an annular interconnection channel of the inlet liquid chamber with the liquid volume. The annular flue gas header is formed with a wall that is concentric to the flue connected to periphery of rear tube sheet and the cover plate of the housing, which in its turn forms together with the housing an annular liquid cavity enclosing the annular flue gas header, which is interconnected with the liquid volume and the liquid discharge connection pipe. The flue from the annular header passes through the annular liquid cavity.

EFFECT: simpler design and improved performance characteristics.

3 cl, 2 dwg