一体化压力补偿式热塑性弹性材质滴头设计与试验

ISWC OpenIR > 水保所知识产出(1956---)

	一体化压力补偿式热塑性弹性材质滴头设计与试验
	杨小坤 1; 牛文全 1,2; 张亮 3
	2019
发表期刊	农业工程学报
卷号	35 期号:21 页码:60-68
摘要	为克服硅胶片类压力补偿式滴头“回收难”的问题，设计开发了一种含热塑性弹性体的全塑料材质的一体化压力补偿式滴头。基于压力补偿式滴头流量补偿原理及计算流体力学数值计算方法，对一体化滴头关键结构参数齿尖角、流道宽度、流道深度、流道单元个数开展正交设计试验，通过 Ansys15.0 软件对滴头迷宫流道结构进行确定，以参数组合齿尖角 34°，流道宽度 0.4 mm，流道深度 0.4 mm，流道单元数 12 个，进行滴头试制并对其补偿性能及抗堵塞性能进行测试。结果表明：该一体化压力补偿滴头流态指数为 0.07，起调压力为 35 kPa，补偿区间为 35～300 kPa，属于恒流灌水器－压力补偿滴头范畴；与国内滴头相比，设计滴头的水力性能更优；在低压堵塞试验中，一体化压力补偿式滴头具有更好的抗堵塞性能，当泥沙浓度为 1.0 g/L，灌水 15 次后，一体化压力补偿滴头与另外两种普通迷宫流道滴头的相对流量分别下降至 93.1%、54.2%、81.8%，一体化压力补偿滴头的抗堵塞性能明显优于普通迷宫流道滴头。该滴头研发周期短、成本低、便于回收利用，是传统滴头的良好替代品。该研究可为一体化压力补偿式滴头结构设计、相关产品研发提供参考。
其他摘要	From the 1980s, China had begun to introduce water-saving irrigation technology and equipment, but China's water-saving equipment research and development mainly relied on technology introduction and product imitation and did not have a completely independent design method and innovative products. Drip irrigation is the most common water-saving irrigation technology. The emitter and the filter are the 2 core devices of the drip irrigation project. The filter with excellent performance can make the water entering the pipe network system qualified, prevent the emitter from being blocked, and ensure the normality of the drip irrigation system when running. A good emitter can make the irrigation water drip into the irrigation area evenly, and has the high anti-blocking ability. The pressure-compensating emitters can achieve stable flow in a wide range of working water pressure changes, so its application range is wider. At present, the pressure-compensating emitters used in the market are imported products from abroad. The production process of these products is complex, requiring multiple molds, high production costs, long cycles, and difficult product quality control. In the promotion of drip irrigation technology, the recovery of drip irrigation belts or emitters is a bottleneck that needs to be overcome in the promotion of drip irrigation technology in China. To overcome the “difficulty of recycling” of pressure-compensating emitters of silicone tablets, this paper designed and developed an all-plastic-integrated pressure-compensating emitter containing thermoplastic elastomer (TPE). TPE is a new type of polymer material that exhibits rubber-like elasticity at normal temperature and can be plasticized at high temperature. Because of its rubber elasticity and easy processing of plastics, TPE has been widely used in various fields. The design emitter was made of TPE and low-density polyethylene materials. Based on the principle of pressure-compensating emitter flow compensation and numerical calculation method of computational fluid dynamics with Ansys 15.0, this study used an orthogonal design test on some important factors of the emitter, such as tip angle, channel width, channel depth, number of channel quantity. With the optimized design which parameter combination tip angle 34°, channel width 0.4 mm, channel depth 0.4 mm, number of channel quantity 12, the emitter was manufactured and tested for its compensating performance and anti-clogging performance. The results showed that the integral pressure-compensating emitter had a flow index of 0.07, a starting compensation pressure of 35 kPa, and a compensation range of 35-300 kPa. With well compensation performance, it belonged to the regulated pressure-compensating emitter; compared with one domestic emitter, the hydraulic performance of the integral pressure-compensating was much better; under low-pressure conditions, the integral pressure-compensating emitter had better anti-clogging performance than the B and C emitters. For example, when the sediment concentration was 1.0 g/L and the system pressure was 50 kPa, and 15 times irrigation later, the relative flows of the emitter A, B and C dropped to 93.1%, 54.2%, and 81.8%, respectively. Based on the integrated "all-plastic" design, the integral pressure-compensating emitter used a two-color injection on rapid prototyping which injected the mold of LDPE followed TPE material, and the two materials could be quickly combined. It was 15%-35% of the production cost of the traditional three-piece (substrate, silicon sheet, base) structure pressure-compensated emitter, and the production efficiency was increased by 50%-150%. Low production cost, short development cycle and easy recycling, it is a better substitute for the traditional emitter, and the study results provide valuable information for the integrated pressure-compensating emitter on construction designing and developing.
关键词	流量压力计算流体力学堵塞热塑性弹性体一体化压力补偿滴头结构设计
收录类别	中文核心期刊要目总览
语种	中文
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/9804
专题	水保所知识产出(1956---)
作者单位	1.西北农林科技大学水利与建筑工程学院 2.西北农林科技大学水土保持研究所 3.山东春雨节水灌溉设备有限公司
推荐引用方式 GB/T 7714	杨小坤,牛文全,张亮. 一体化压力补偿式热塑性弹性材质滴头设计与试验[J]. 农业工程学报,2019,35(21):60-68.
APA	杨小坤,牛文全,&张亮.(2019).一体化压力补偿式热塑性弹性材质滴头设计与试验.农业工程学报,35(21),60-68.
MLA	杨小坤,et al."一体化压力补偿式热塑性弹性材质滴头设计与试验".农业工程学报 35.21(2019):60-68.

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