VEHICLE HEATER Russian patent published in 2020 - IPC B60H1/22 

FIELD: vehicle heating systems.

SUBSTANCE: vehicle heater includes area (12) of burner with surrounded wall (16) on periphery of combustion chamber combustion chamber (18), adjacent to first end (22) of flame tube to wall (16) along periphery of combustion chamber or / and providing at least part of wall (16) on periphery of combustion chamber flame tube (20) with second end (24) of flame tube open to outlet of gaseous combustion products in direction of longitudinal axis A of flame tube, housing (28) of heat exchanger with wall (28) enclosing outside fire tube (20) along periphery of heat exchanger housing and lying in axis opposite to second end (24) of flame tube by bottom part (30) of heat exchanger housing. Between external side (36) of flame tube (20) and inner side (38) of wall (28) on periphery of heat exchanger housing space (40) for recirculation of gaseous combustion products with inlet area (34) on second end (24) of flame tube is formed and with outlet area (48) in the area of first end (22) of the flame tube, wherein the internal dimension (r_i) walls (28) along the periphery of the heat exchanger housing increases in the direction from region (34) input space (40) for recirculating the gaseous combustion products to area (48) exit space (40) for recycling combustion gases, characterized in that the outer dimension (r_a) of flame tube (20) increases in the direction from second end (24) of the flame tube to first end (22) of the flame tube.

EFFECT: higher efficiency of heat transfer.

11 cl, 7 dwg