Direct current heating urea solution delivery hose
A technology for conveying hoses and direct current, applied in the direction of hoses, pipes, pipes/pipe joints/fittings, etc., can solve problems such as deterioration and difficult temperature control, and achieve the effects of low wear, non-penetration, corrosion resistance and wear resistance.
Active Publication Date: 2010-03-10
浙江铁马科技股份有限公司
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Problems solved by technology
In the past, there were reports of urea solution delivery pipes with heating function, but this kind of pipes use general electric heating wires to be spirally wound on the outside of the urea solution delivery pipes to heat the urea solution delivery pipes. The delivery pipes with this structure, no matter how high the spiral density , there will always be a temperature gradient between the direct contact part and the non-direct contact part of the heating wire on the urea delivery pipe, which makes it difficult to control the temperature, and it is easy to deteriorate the urea delivery pipe and the urea solution in it due to local high temperature
Method used
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Embodiment Construction
[0007] Refer to attached picture. The present invention includes a composite urea solution delivery inner pipe 2, the outer layer 2.2 of which is a nylon outer layer, and the inner layer 2.1 is made of ethylene-tetrafluoroethylene copolymer (ETFE), and the inner layer and the outer layer are combined into one. The polymer PTC heating wire 6 with self-temperature control function is closely attached to the outer side of the nylon outer layer, and the outer layer is a metal aluminum foil layer 7 with heat conduction function, which is tightly wound to transport the urea solution to the inner tube 2 and the heating wire 6 is included, and the heat insulation material layer 5 is tightly wrapped outside the metal aluminum foil layer 7 to prevent heat leakage and play a role of heat insulation. The outermost layer is a waterproof and anti-friction insulation protection layer 3.
[0008] The nylon outer layer can be made of PA12 (obtained from ω-laurolactam ring-opening polymerizatio...
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The invention provides a direct current heating urea solution delivery hose comprising a urea solution delivery inner tube and a macromolecule PTC hot wire, wherein the outer side of the urea solutiondelivery inner tube is tightly stuck to the macromolecule PTC hot wire with a self-thermal control function, and the PTC hot wire is led out via a lead and is connected with a control unit via a connector to heat the urea solution delivery inner tube. The urea solution delivery inner tube provided by the invention has enough strength, flexibility and ageing resistance, is not easy to permeate, can prevent urea solution from freezing, can prevent the urea solution delivery inner tube and urea solution from deteriorating because of local overheating, can favourably ensure that the SCR system can work at low temperature and urea solution flows in the pipeline, and has the advantages of anticorrosion and small abrasion.
Description
technical field [0001] The invention relates to an electrically heated urea solution delivery hose. Background technique [0002] Heavy-duty diesel vehicles that meet the national 4 emission standards use the selective catalytic reduction (SCR) exhaust after-treatment system to treat nitrogen oxides (NOx) to meet the requirements of environmental protection regulations. The main principle is to quantitatively inject AdBlue (ie 32.5% urea solution) to deal with nitrogen oxides (NOx), AdBlue starts to freeze at -11°C. When thawed, AdBlue returns to a normal solution state. In regions where prolonged cold weather is the norm, an inoperable SCR due to frozen lines is unacceptable. Therefore, the introduction of the urea solution delivery pipeline with heating function is imperative. In the past, there were reports of urea solution delivery pipes with heating function, but this kind of pipes use general electric heating wires to be spirally wound on the outside of the urea sol...
Claims
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Inventor 王以余
Owner 浙江铁马科技股份有限公司