Patent ID: 10392983

Abstract:
A normal suction pipeline (27) through which urea water that is sucked from a urea water tank (22) toward a urea water pump (25) flows and a heater-equipped return pipeline (29) through which the urea water that is returned from the urea water pump (25) toward the urea water tank (22) flows are connected between the urea water tank (22) and the urea water pump (25). A supply pipeline (28) through which the urea water that is supplied toward a urea water injection valve (14) by the urea water pump (25) flows is connected between the urea water pump (25) and the urea water injection valve (14). The heater-equipped return pipeline (29) is equipped with a heating wire (29B) adapted to heat the urea water therein. The normal suction pipeline (27) is formed as a pipeline that is not equipped with the heater. The heater-equipped return pipeline (29) and the normal suction pipeline (27) are disposed in a state of contact with each other.