Exhaust gas purifying device for an internal combustion engine

Claim 2

An exhaust gas purifying device for an internal combustion engine comprising: an air supply source, a reactor including an inner shell forming a reaction chamber, an exhaust inlet to said reaction chamber, said reactor further including an outer shell surrounding said inner shell and spaced therefrom to define with said inner shell a cooling space, an air inlet provided on said outer shell and communicating with said cooling space, an air outlet provided on said outer shell and communicating directly with the atmosphere, a conduit connected to said air supply source and said air inlet, whereby cooling air passes from said supply source to the cooling space to cool the reactor and thence directly to the atmosphere, an air control valve provided in said conduit for controlling the cooling air supplied to said cooling space, and means responsive to an engine parameter representative of exhaust gas temperature to variably adjust said control valve such as to increase the cooling effect of the inner shell with increased exhaust gas temperature.

Claim 3

An exhaust gas purifying device as set forth in claim 1, further including a second conduit branched from said conduit upstream of said air control valve to connect said air supply source to the exhaust gas system of the engine whereby the relation between the amount of cooling air supplied to the cooling space and the secondary air supplied to the reactor is controlled by opening or closing said air control valve.

Claim 4

An exhaust gas purifying device for an internal combustion engine comprising: an air supply source, a reactor including an inner shell forming a reaction chamber, an exhaust inlet to said reaction chamber, said reactor further including an outer shell surrounding said inner shell and spaced therefrom to define with said inner shell a cooling space, insulation means surrounding said outer shell, an air inlet provided on said outer shell and communicating with said cooling space, an air outlet provided on said outer shell and commuNicating directly with the atmosphere, a conduit connected to said air supply source and said air inlet, whereby cooling air passes from said supply source to the cooling space to cool the reactor and thence directly to the atmosphere, an air control valve provided in said conduit for controlling the cooling air supplied to said cooling space, and means responsive to an operating parameter of said exhaust gas purifying device to variably adjust said control valve such as to increase the cooling effect of the inner shell with increased exhaust gas temperature.

Claim 5

An exhaust gas purifying device for an internal combustion engine comprising: an air supply source, a reactor including an inner shell forming a reaction chamber, an exhaust inlet to said reaction chamber, said reactor further including an outer shell surrounding said inner shell and spaced therefrom to define with said inner shell a cooling space, insulation means surrounding said outer shell, an air inlet provided on said outer shell and communicating with said cooling space, an air outlet provided on said outer shell and commuNicating directly with the atmosphere, a conduit connected to said air supply source and said air inlet, whereby cooling air passes from said supply source to the cooling space to cool the reactor and thence directly to the atmosphere, an air control valve provided in said conduit for controlling the cooling air supplied to said cooling space, and means responsive to an operating parameter of said exhaust gas purifying device to variably adjust said control valve such as to increase the cooling effect of the inner shell with increased exhaust gas temperature.

Claim 6

An exhaust gas purifying device as set forth in claim 3, further including a second conduit branched from said conduit upstream of said air control valve to connect said air supply source to the exhaust gas system of the engine whereby the relation between the amount of cooling air supplied to the cooling space and the secondary air supplied to the reactor is controlled by opening or closing said air control valve.