Patent GB-1012026-A (GB)
Title: Exhaust gas purifying means
IPC: F01N3/28
Filed: 1962-05-25
Abstract: 1,012,026. Treating exhaust gases; ejectors. W. EBERSPACHER and H. EBERSPACHER, [trading as J. EBERSPACHER]. May 25, 1962 [June 28, 1961], No. 20207/62. Headings FIB and F1E. A catalytic exhaust gas purifier 3, Fig. 1, has a thermostat controlling means for heating or cooling the catalyst to maintain its temperature within predetermined limits. In Fig. 1 the vehicle heater 9 has a fan 12 which normally blows air over a burner chamber 15 and through passage 17 into the vehicle 10. At starting the burner combustion products are diverted through passage 21 into the space around an injector 2 through which the engine exhaust gases flow. The combustion products are sucked into the injector along with heated air through passages 20, 19, and heat up the catalytic device, which comprises separate catalysing chambers 3...5. When a predetermined working temperature is reached the pipe 21 is closed and the valves 18b, 18a, are controlled automatically to vary the amount of air added to the exhaust gases and control the temperature of the catalytic devices, which may have pressure switches 6 ... 8 associated therewith to indicate blocking of the catalyst. In a modification, Fig. 2, a blower supplies air to a combustion chamber 24 of a heater controlled by the thermostat; the hot gases flowing to a space 26 around an exhaust pipe 30 leading to an injector 29 and flowing on through pipe 32a to a pipe 32 on which the catalyst is supported. Cold air to cool the exhaust gases is supplied through pipe 27b. In Fig. 3 the catalytic exhaust purifying device 41 is connected to the vehicle heater 56. The exhaust gases from injector 37 are drawn in, at starting, by a turbine 44a driven by an electric motor 54 and flow through space 39b, to heat the catalyst chamber, to the exhaust outlet 39c. The motor 54 also drives an air fan 47 which draws air through inlet 49b, and forces it over exhaust heated chamber 39b and through passage 53 and orifices 49a into chamber 64 which surrounds the main air heater device in which fuel injected by injector 62c on to a vaporizer 61 is burnt with air supplied by fan 53. The hot gases flow through annular heater 62a to heat the air flowing through channel 64, which air flows through exit c to heat the vehicle. Some of the hot gases are by-passed through pipe 63e to a valve 64 which, when open, directs the gases to inlet 63a<SP>1</SP> to heat the catalyser. A valve 38a<SP>1</SP> may also be opened to admit cool air from the passage 53 into the exhaust injector 37 to cool the catalytic device 41. In Fig. 6 a three stage engine driven compressor 82 supplies oxidizing air from stage 82a through pipe 90 to the exhaust pipe 84, combustion air from stage 82c through pipe 93 to a burner chamber 87, with fuel supply 88, when it is desired to heat the catalyser 85, and cooling air from stage 82b through pipe 92 when it is desired to cool the catalyser, the pipes 92, 93, being controlled by temperature responsive valves 92a, 93a. The exhaust injector 76, Fig. 7, associated with the entrance of the catalytic device may have a nozzle with starshaped section 76a to improve the mixing of the gases.