AIR HEATER Russian patent published in 1997 - IPC

FIELD: automotive industry; starting preheaters for internal combustion engines. SUBSTANCE: air heater has fan 11; burner 2 and heat exchanger with housing 7 and gas conduit communicating at one side with burner 2 which has inner channel 8, outer channel 9 and gas outlet branch pipe 10; air space 11 communicating with burner 2 and inner and outer air channels 12 and 13, respectively, arranged between inner and outer channels of gas conduit and outer channel 9 of gas conduit and housing 7. It has also air supply branch pipe 14 connected with fan 1 and air outlet branch pipe 15, both arranged at side of heater opposite to burner 2. All air from fan 1 passes through branch pipe 14 into one air channel, 12 or 13, where pressures and air flow velocities get equalized, air gets partially heated from walls of gas conduit and passes further into air space 11. Then main portion of air passes in opposite direction through other air channels of heat exchanger where it gets additionally heated and is delivered through branch pipe 15 for heating the engine. Smaller portion of preliminarily heated air passes in uniform flow from all sides into flame tube 3 of burner 2 to maintain burning. EFFECT: facilitated starting of vehicle engine at below zero temperatures. 2 cl, 1 dwg