EXHAUST GAS POST-TREATMENT UNIT AND CONSTRUCTION VEHICLE CARRYING SAME

摘要

An exhaust gas post-treatment unit includes a diesel particulate filtering device that treats engine exhaust gas, a selective catalyst reduction device that treats the engine exhaust gas, a connecting pipe, an injection device, a cooling water supply pipe and a cooling water return pipe. The connecting pipe connects the diesel particulate filtering device and the selective catalyst reduction device. The injection device is disposed on the connecting pipe and injects a reducing agent into the exhaust gas supplied to the selective catalyst reduction device. The a cooling water supply pipe guides cooling water to the injection device to cool the injection device. The cooling water return pipe discharges the cooling water from the injection device. At least one of the cooling water supply pipe and the cooling water return pipe has a convection section extending upward along the connecting pipe from a connecting portion with the injection device.

主权项

1. An exhaust gas post-treatment unit comprising:
a diesel particulate filtering device configured to treat engine exhaust gas; a selective catalyst reduction device configured to treat the engine exhaust gas; a connecting pipe connecting the diesel particulate filtering device and the selective catalyst reduction device; an injection device disposed on the connecting pipe, the injection device injecting a reducing agent into the exhaust gas supplied to the selective catalyst reduction device; a cooling water supply pipe configured to guide cooling water to the injection device to cool the injection device; and a cooling water return pipe configured to discharge the cooling water from the injection device, the cooling water supply pipe and the cooling water return pipe having respectively a convection section extending upward along the connecting pipe from a connecting portion with the injection device.