| 摘要 |
A tube heating structure for an urea-SCR(Selective Catalyst Reduction) system is provided to transport urea in a stable manner through an urea tube even under a cold condition, by actively heating the urea tube. A tube heating structure for an urea-SCR system includes an urea tube(1), an electric heating wire(3), an insulation tape(5), an insulation tube(7), and a flexible tube(9). The urea tube has an inside in which urea flows. The electric heating wire is wound into a spiral shape onto an outer surface of the urea tube. The insulation tape is wound onto the outer surface of the urea tube where the electric heating wire is wound. The insulation tube covers the outer surface of the urea tube wound with the insulation tape. The flexible tube is arranged to cover an outer surface of the insulation tube, and has convex-concave patterns repeated in a lengthwise direction.
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