增加带有电加热盘管的软管的流量,为喷涂提供加厚的防腐剂

IF 0.1 Q4 ENGINEERING, MULTIDISCIPLINARY Engineering Technologies and Systems Pub Date : 2021-12-30 DOI:10.15507/2658-4123.031.202104.559-576
A. I. Petrashev, L. Knyazeva
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引用次数: 0

摘要

介绍。农业机械工作元件的防腐保护是通过加热加厚防腐剂的气动应用来提供的。为此,在防腐剂供应软管内插入一个线圈并连接到电流源。已知线材厚度和线圈节距会影响流体流动的水力阻力。然而,尚未确定线圈插入的直径及其加热如何影响柔性软管通道的流量。本研究的目的是增加带有电加热盘管的柔性软管的容量。为此,有必要确定其几何参数,以尽量减少对增稠的防腐剂流动的水力阻力,并减少软管中加热材料的能耗。材料与方法。建议研究两个长度相同但直径不同的电加热盘管,它们由长度相等的钢焊丝片组成。建立了一个支架,研究了插接线圈参数对软管液压阻力的影响。当使用过的机油和增稠的防腐剂流过软管时,该支架用于测定带有线圈的软管和光滑软管中的压力损失。对冷盘管和热盘管软管的流量进行了估算。提出了在软管管壁层中加热防腐剂的方法。同时,其流量比在软管中部加热防腐剂时增加1.5倍,能耗减少(2.4倍)。在层流模式下,当线圈为软管通道直径的0.85时,软管内的压力损失比线圈为管道直径的0.67时低2倍。讨论与结论。研究找到了在加热软管通道壁上放置线圈的合理方法。在低温下,通过在软管内加热降低增稠的防腐剂粘度,可使压力损失降低50%,使其流量增加1.4-2.0倍。在使用加厚防腐剂的软管中使用电加热盘管,将在露天储存场所保存设备时最大限度地减少能源消耗。
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Increasing the Flow Capacity of Hoses with Electrical-Heater Coils to Supply Thickened Preservatives for Spraying
Introduction. Anticorrosion protection of agricultural machinery working elements is provided through using pneumatic application of thickened preservatives with heating. For this purpose, a wire coil is inserted inside the preservative-supply hose and connected to a current source. It is known that the wire thickness and the coil pitch affect the hydraulic resistance to fluid flow. However, it has not been established how the diameter of the coil insert and its heating affect the flow capacity of the flexible hose channel. The purpose of the research is to increase the capacity of a flexible hose with an electrical-heater coil. For this purpose, it is necessary to determine its geometric parameters minimizing the hydraulic resistance to the thickened preservative flow and reducing the energy consumption for heating the material in the hose. Materials and Methods. It is proposed to investigate two electrical-heater coils of the same length, but of different diameter, made of steel welding wire pieces of equal length. There was developed a stand to study the influence of the inserted coil parameters on the hose hydraulic resistance. The stand was used to determine pressure losses in hoses with coils and in smooth hoses when used engine oil and thickened preservative flow through them. The flow capacity of the hose with cold and heated coils was estimated. Results. The method of heating the preservative in the hose wall layer is justified. At the same time, its flow capacity increases one and a half times with less energy consumption (2.4 times) than when heating the preservative in the central part of the hose. Under laminar flow mode, the pressure loss in the hose is 2 times lower when the coil is equal to 0.85 of the hose channel diameter than when the coil is equal to 0.67 of the channel diameter. Discussion and Conclusion. The research found the rational way of placing the electrical coil near the heated hose channel wall. At low air temperature, the reduction of the thickened preservative viscosity by heating in the hose helps to decrease the pressure loss up to 50% and increase its flow capacity by 1.4‒2.0 times. The use of a electrical-heater coil in the hose with thickened preservative will minimize energy consumption when preserving equipment on open storage sites.
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来源期刊
Engineering Technologies and Systems
Engineering Technologies and Systems ENGINEERING, MULTIDISCIPLINARY-
自引率
33.30%
发文量
29
审稿时长
12 weeks
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