Secondary air supply means of exhaust gas cleaning devices

Details Secondary air supply means of exhaust gas cleaning devices Secondary air supply means of exhaust gas cleaning devices

1975-06-13

1976-06-15

Tayman, Jr., James H.

Chemistry: physical processes

Physical processes

Crystallization

23288F, 23288FA, 60289, 60299, 423212, 4232132, F01N 314

Patent

active

039634442

ABSTRACT:
In an exhaust gas cleaning device of the type having a reaction chamber provided intermediate of the exhaust pipe of an internal combustion engine, secondary air supply means comprising a portion of the exhaust pipe upstream of the reaction chamber which is constructed into a double wall structure having an inner wall defining an exhaust gas passage and an outer wall defining an outer chamber around said inner wall for the passage of secondary air valve means for opening and closing a secondary air supply hole formed in the inner wall and an air releasing hole formed in the outer wall for releasing the secondary air into the atmosphere, a temperature detector disposed within the reaction chamber and means for operating said valve means in response to a signal from said temperature detector, whereby when the internal temperature of the reaction chamber is lower than a predetermined level, the secondary air heated during passage through said outer chamber is supplied into the exhaust gas passage from said secondary air supply hole, while when the internal temperature of the reaction chamber becomes higher than the predetermined level, the secondary air cools the exhaust gases through the inner wall and is released into the atmosphere through said air releasing hole.

REFERENCES:
patent: 3168806 (1965-02-01), Calvert
patent: 3172738 (1965-03-01), Houdry
patent: 3203168 (1965-08-01), Thomas

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