GB1348868A - Air heaters for movable units - Google Patents

Abstract

1348868 Air heaters J EBERSPACHER 26 July 1972 [6 Aug 1971] 35024/72 Heading F4S In a liquid-fired air heater, particularly for use in mobile units such as motor vehicles or ships, a unitary pressure casting or injection moulding 28 which is surrounded by an outer synthetic resin easing 80, defines a combustion chamber 30, a laterally extending precombustion chamber 32, a fuel-inlet connection (34, Fig. 3) opening at an angle into the precombustion chamber 32, a heat exchanger 36 which together with its internal and external finned or ribbed surfaces 38, 40 forms an axial extension of the combustion chamber 30, and a lateral exhaust gas outlet 42. A single motor 12 drives both a fresh air blower 16 and a combustion air impeller 20, the combustion air entering through an inlet 48 being guided into the combustion chamber 30 through an annular nozzle 54 defined between an insert plate 46 having attached baffles 64 and a sheet metal cap 50 carried by and rotating with the impeller 20. Air to be heated entering through inlet connection 82 passes over the external finned surface of the exchanger 36 and leaves as heated air through an outlet connection 84. Combustion gases leaving the combustion chamber, which in part is defined by a funnel-shaped member 68, flow through an open ended perforated flame tube 72 and over the internally finned surface of the heat exchanger to finally leave through the exhaust outlet 42. The air heater can be provided with an over-heat cut-out. The motor 12 and impellers 16, 20 form a unit which is held in position by a supporting element 22 rigidly secured to an end flange of the pressure casting 28 by a number of bolts 24.