FIELD: power engineering.
SUBSTANCE: invention relates to power engineering, in particular, to chimneys for discharge of flue gases from heating devices, such as furnaces and fireplaces. Sandwich-pipe for chimney includes coaxially installed with a gap relative to each other and interconnected by heat-insulating material inner and outer pipes. In the gap between the pipes there is a heating element made in the form of an electric ring heater fixed on the outer surface of the internal pipe. At the ends of the internal and external pipes there made are structural elements of the spigot connection with internal and external pipes of similar sandwich-pipes.
EFFECT: increased draft of flue pipe of heating device.
1 cl, 1 dwg
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