REDUCING AGENT SUPPLY TO EXHAUST GASES SYSTEM Russian patent published in 2017 - IPC F01N3/20 

FIELD: engines and pumps.

SUBSTANCE: invention relates to a system (1) feeding the urea, in particular for exhaust gas purification device by treating internal combustion engine exhaust gases, with a collection (5) for the substance, a metering device (7) for dispensing a substance, in particular in the outlet conduit (3) an internal combustion engine and a supply line (9) which includes a supply conduit (11) for supplying the substance to the dosing device (7) and a recirculation conduit (13) for discharging the medium from the metering device (7) in the collection (5) and dosing unit (7) is configured so that the operating mode of the system (1) for supplying the cooling agent flows from the inlet connection pipe (17) to the outlet connection pipe (19) of the metering device (7). Thus, it is provided that the supply conduit (9) includes a bypass additional fluid connection (23) between the feed duct (11) and the recirculation conduit (13), and an additional fluid connection (23) before the inlet connection piece (17) of the metering device (7) is included in the supply conduit (11) and after the outlet connection nozzle (19) of the metering device (7) is included in the recirculation conduit (13). In a further fluid connection (23) a throttle device (43) or the make-up device is arranged.

EFFECT: exclusion of damage due to thermal stress, when the liquid circuit is blocked in the area of the collection of frozen liquid.

10 cl, 1 dwg