Urea heating liquid return pipe

Abstract

The invention relates to a urea heating liquid return pipe. Rapid inserting connectors are arranged at the two ends of a urea liquid return pipe body correspondingly. A corrugated pipe is arranged outside the urea liquid return pipe body. A heating wire or a heating belt is arranged in the urea liquid return pipe body and is arranged at the center position through the rapid inserting connectors atthe two ends in the urea liquid return pipe body, and a lead-out plug arranged on the side wall of one rapid inserting connector is used for wire connection. A temperature sensor is further arrangedin the urea liquid return pipe body, and the lead-out plug is used for wire connection. The heating wire or the heating belt in the urea liquid return pipe body is cured in the rapid inserting connectors at the two ends. The lead-out plug is also cured on the side wall of one rapid inserting connector. The heating wire or the heating belt conducts heating in the urea liquid return pipe body, a heating element is planted in a middle part in the pipe, plastics at the two ends are located at the center position in the pipe, and when the urea solution enters a pipe body, the urea solution flows ata constant speed, the purpose of constant-speed heating is achieved; and it is guaranteed that heat conductive heating power losses are avoided.

Description

technical field [0001] The invention relates to components of an automobile tail gas treatment system, in particular to a urea heating liquid return pipe. Background technique [0002] The urea liquid return pipe is the key component of the automobile exhaust gas treatment system. It is thick and heated under low temperature conditions. The existing technology produces and manufactures the urea heating pipe of the SCR exhaust gas treatment system. The heating element is heated outside the pipe, and the heating is not uniform and the heating is not comprehensive. There is a phenomenon of insufficient heating conduction in low temperature environments, especially in extreme conditions around -50°C, the heating effect is not ideal, resulting in the failure of the SCR exhaust gas treatment system to operate normally, often accompanied by signals that cannot be recognized and captured by the computer. [0003] CN201420625544.2 discloses a urea heating pipeline with heating, which...

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Problems solved by technology

[0004] The above-mentioned patent document uses a heating belt on the outer wall of the conveying pipeline. Under extreme conditions of around -50°C, the heating effect is not ideal, resulting in the failure of the SCR exhaust gas treatment system to operate normally, often accompanied by signals that cannot be recognized by the computer. and capture

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