FIRE-TUBE MULTIPLE PASS BOILER Russian patent published in 2016 - IPC F22B7/12 

FIELD: heat engineering.

SUBSTANCE: present invention relates to heat engineering, namely to devices intended for water heating. Multiple pass fire-tube boiler includes housing with cover at the inlet and discharge branch pipe of exhaust gases at the outlet. Boiler comprizes fire furnace pipe and fire pipes of combustion products, covering the fire furnace pipe. On the housing wall there are inlet and outlet water branch pipes. Fire pipes from the side of branch pipe for discharge gases are included in a pipe wall and are connected by this wall with the body in front of said branch pipe, on the other side they are connected to the other pipe wall with flange and fixed in the housing. On the side of flange attachment of fire pipes with the body, fire furnace pipe is connected with front cover with possibility of disconnection. Cover is manufactured as water-cooled together with fire furnace pipe to make therewith a single water-cooled structure. This structure is fixed in the boiler housing with possibility of independent extraction of the fire pipes, fixed in the housing of the boiler independently of the fire furnace pipe. Cover is connected with the flange of the boiler housing through a heat-resistant sealing gasket, providing for temperature changes of the fire furnace pipe and fire pipes in independent parts of the boiler.

EFFECT: when using the invention design simplification and reliability in operation is provided, as well as comfort at work in cleaning and repairs as fire furnace pipe as well as fire pipes.

1 cl, 2 dwg