WO2010083765A1 - 防止地下滴灌系统负压及根系堵塞的装置 - Google Patents

防止地下滴灌系统负压及根系堵塞的装置 Download PDF

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Publication number
WO2010083765A1
WO2010083765A1 PCT/CN2010/070310 CN2010070310W WO2010083765A1 WO 2010083765 A1 WO2010083765 A1 WO 2010083765A1 CN 2010070310 W CN2010070310 W CN 2010070310W WO 2010083765 A1 WO2010083765 A1 WO 2010083765A1
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Prior art keywords
drip irrigation
dripper
elastic member
blockage
irrigation system
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PCT/CN2010/070310
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English (en)
French (fr)
Inventor
于颖多
龚时宏
许迪
王建东
马晓鹏
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中国水利水电科学研究院
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Publication of WO2010083765A1 publication Critical patent/WO2010083765A1/zh

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G25/00—Watering gardens, fields, sports grounds or the like
    • A01G25/06—Watering arrangements making use of perforated pipe-lines located in the soil
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion

Definitions

  • the invention relates to an anti-clogging device for underground drip irrigation, in particular to a device for preventing negative pressure and root blockage of a subsurface drip irrigation system.
  • Subsurface drip irrigation is a more water-saving irrigation technique developed from ground drip irrigation. It is buried in a capillary tube and emitter (also known as a dripper) buried at a certain depth in the ground (usually buried at a depth of 20-40 cm). The root zone of the crop is directly supplied with water, thereby reducing the evaporation loss of the topsoil of the water and improving the utilization efficiency of the irrigation water.
  • the dripper also known as the emitter
  • the dripper is the most critical component on the drip irrigation capillary. It acts to allow the pressurized water flow to dissipate completely through its internal flow path and to drip into the soil at a steady, uniform low flow rate.
  • the flow rate of the dripper is very small, and the flow rate of the single dripper is only 1 to 8 L/h.
  • the internal flow path of the dripper is mostly zigzag or labyrinth.
  • the width of the flow channel is very narrow, usually only about 0.3-2 mm. .
  • the dripper outlet hole is also very small, generally only 0. 5 ⁇ 1. 2mm or so, so the fatal weakness of the dripper is extremely easy to be blocked by dirt and lead to scrap.
  • Negative pressure suction blockage and root invasion blockage are the two most important factors causing blockage of the buried dripper.
  • the dripper Under drip irrigation conditions, the dripper is in an environment surrounded by soil and crop roots.
  • the water pressure in the pipe network (provided by the pump) is greater than the atmospheric pressure Pa, and the dripper can flow out normally to supply water to the crop roots.
  • the underground drip irrigation system closes the valve to stop the water supply, that is, when the water pump is turned off, due to the sudden decrease of the pressure in the pipe network, a reverse pressure difference is generated inside and outside the drip irrigation capillary tube, and the pressure in the drip irrigation capillary tube is less than the atmospheric pressure Pa, that is, negative.
  • the pressure state will cause the fine particles of soil around the dripper to be sucked into the inside of the dripper flow channel to cause blockage.
  • This blockage is the negative pressure suction blockage of the underground drip irrigation system.
  • the specific method is to use the non-woven fabric and coarse sand as the filter material for the field comparison test.
  • the specific scheme is as follows: 100g needle-punched non-woven fabric, cut into 3cm X 3cm pieces, wrapped in the hole; One is to sift the coarse sand, remove the powder and fine sand, wash away the clay, put it into a 5cm X 5cm bag made of Imm X lmm nylon mesh, and put the sand bag on the water outlet to protect it. .
  • an in-line pressure compensation dripper In view of the negative pressure suction problem of subsurface drip irrigation, some of them start from the internal flow path of the dripper, and an in-line pressure compensation dripper is designed.
  • the pressure compensation sheet can be automatically adjusted according to the degree of change of the system working pressure.
  • the size of the flow cross section ensures the uniformity of the outflow; when the pressure at the inlet of the dripper is less than zero, that is, when the negative pressure is stopped by the irrigation, the pressure compensator is pressed against the flange at the end of the flow passage due to the elastic automatic contraction.
  • the soil moisture near the dripper is high. Due to the water-growth of the crop roots, the roots of the crop will accumulate at the dripper, and some roots may protrude into the dripper outlet. , causing the roots of the dripper to become clogged.
  • the roots in the small range near the dripper were killed by regularly injecting a small amount of chloride, acid or trifluralin in the irrigation water to relieve the drops. The root of the head is clogged.
  • Geof Low Company of the United States has developed a special dripper for root intrusion clogging.
  • the company dissolves specific volatile herbicides in the plastic material that produces the dripper. After the dripper is buried, the weeding in the plastic The agent will be released into the soil around the dripper at a certain rate in the form of steam, thereby forming a soil environment that is not conducive to the development of the root system of the crop in a small area near the dripper, inhibiting the growth of the root system near the dripper, and causing the dripper itself to repel Root.
  • the dripper will also slowly release the toxic gas containing herbicides and cause environmental pollution.
  • the dripper used in underground drip irrigation at home and abroad generally consists of a drip inlet, a drip channel and a drip outlet.
  • the pressurized water flows through the drip inlet into the drip channel, and the drip channel is fully Dissipate energy and infiltrate into the surrounding soil through the dripper outlet. Therefore, the water outlet of the dripper is a passage connecting the dripper flow path and the soil outside the dripper, and is also the only one of the soil particles (under negative pressure) that is sucked into the dripper flow path when the water supply of the irrigation system is stopped. Pathway; at the same time, The only way for crop roots to reach the dripper.
  • the object of the present invention is to provide a device for preventing negative pressure and root blockage of a subsurface drip irrigation system, which has the advantages of simple structure, convenient installation and low cost, and can effectively solve the negative in the drip irrigation process. Pressure suction and root invasion problems.
  • the technical solution adopted by the present invention is: A device for preventing negative pressure and root blockage of a subsurface drip irrigation system, and an elastic member disposed outside the drip nozzle outlet in the subsurface drip irrigation system.
  • the pressure in the drip irrigation tube is equal to the atmospheric pressure pa, and the elastic member is closely attached to the water outlet, and the interference with the dripper is small (the interference is small), so that the dripper is out.
  • the nozzle is closed.
  • the water pump is turned on, that is, the underground drip irrigation system starts to work, the water pressure in the drip irrigation pipe gradually increases.
  • the material is related, but since the water pressure is much larger than the elastic component of the elastic member, the elastic component of the elastic component can be neglected.
  • the elastic component is elastically deformed under the action of the pressure, and the elastic component is disengaged from the water outlet, that is, the elastic component is The pressure of the water rises up and there is a gap between the water outlet and the water outlet, so that the water flow smoothly flows out.
  • the elastic component is separated from the dripper outlet only during the irrigation process, and the elastic components are attached to the dripper outlet at other times, and the passage of the crop root into the interior of the dripper is locked, thereby effectively preventing The root of the dripper is invading the blockage problem.
  • the elastic member and the drip nozzle outlet are also closely attached, and the dripper outlet is locked. Therefore, the problem of negative pressure suction clogging of the dripper can be effectively avoided.
  • the elastic member is an elastic ring or an elastic piece.
  • the invention has the beneficial effects that the invention intercepts from the dripper outlet compared to the prior art,
  • An elastic ring is designed to protect the water outlet, which effectively solves the problem of negative pressure suction blockage and root invasion and blockage of the dripper, and has the advantages of simple structure, convenient installation and low cost.
  • Figure 1 is a schematic view showing the installation of the device of the present invention
  • Figure 2 is a schematic view showing the apparatus for measuring the anti-negative pressure performance of the dripper of the present invention
  • Fig. 3 is a graph showing the measurement of the anti-negative pressure clogging performance of the dripper to which the elastic ring of the present invention is attached.
  • a device for preventing negative pressure and root blockage of a subsurface drip irrigation system as shown in Fig. 1 is an elastic member disposed outside the drip nozzle water outlet 3 of the drip irrigation capillary 1 in the subsurface drip irrigation system.
  • the elastic member is an elastic ring 4 or an elastic piece. That is, when the drip irrigation capillary 1 is tubular, the dripper outlet 3 of the dripper 2 is sheathed to the elastic ring 4 (see Fig. 1); when the drip irrigation capillary 1 is strip-shaped, the dripper outlet 3 of the dripper 2 is externally bonded.
  • a drip irrigation capillary 1 with a cylindrical dripper was selected in the drip irrigation market, and then an elastic ring 4 was installed at the position of the drip nozzle 3 on the drip irrigation capillary 1, and according to drip irrigation
  • the standard method of capillary testing was to test the performance of the dripper sample 10 after the elastic ring was installed. 6 ⁇
  • the diameter of the diameter of the drip nozzle is 0. 6mm.
  • the elastic ring is made of a silicone, a diameter of 15.9mm, the thickness of the elastic ring is lmm, the width is 0. 8mm.
  • the cross section of the elastic ring is rectangular.
  • the cross section of the elastic ring 4 can also adopt a common geometric shape such as a circle or a rhombus.
  • test device shown in FIG. 2 In order to detect the protective effect of the elastic ring on the negative pressure suction, the test device shown in FIG. 2 is used.
  • negative pressure aspirator in the figure: 10 is a dripper sample with an elastic ring, 20 is a vacuum gauge, 30 is a vacuum pump access point, and 40 is an air tank.
  • the anti-negative pressure clogging performance of the dripper after the elastic ring was installed was tested indoors.
  • the device can apply any negative pressure in the range of 0 ⁇ 80Kpa to the test dripper. In the actual measurement, 25 drip samples 10 with elastic coils will be connected one by one to the test port of the vacuum suction device, and 20Kpa, 40 Kpa, 60 Kpa, and 80 Kpa will be tested by vacuum pump classification. Negative pressure, correspondingly complete the test of the dripper anti-negative pressure performance under different pressures.
  • a pressure holding test is performed, and the change of the vacuum gauge reading is observed every 5 minutes for a duration of 40 minutes.
  • the test results show that all the dripper samples 10 with elastic rings are kept in a stable state within the specified test time range.
  • the elastic ring is installed to ensure that when it is working under negative pressure, no air can enter the flow channel from the outlet hole of the dripper, which means that the soil particles around the dripper cannot be sucked into the flow channel, and the elastic ring is added.
  • the rear dripper has good anti-negative pressure blocking performance.
  • the dripper was used for the irrigation test of the lawn at the Beijing XX Irrigation Test Base. After continuous observation for one year, the growth of the turfgrass was normal, and the height was tidy. It shows that the dripper with elastic ring has better performance and better uniformity of irrigation, which can fully meet the needs of crops.
  • 25 drip heads were randomly excavated from the soil and the drip channel was cut open. No root residue was found in the dripper, indicating that the dripper with elastic ring also had better root blockage resistance.
  • the elastic component has a simple structure, low cost, convenient installation, and easy installation of the production line;
  • the elastic part can be used as an optional component of existing drip irrigation tubes. Allow customers to have more choices. If customers need to carry out ground irrigation, they do not need to purchase this elastic ring. If customers need underground drip irrigation system, they only need to add an elastic ring on the original basis to put ordinary drip irrigation pipe. Transformed into a special drip irrigation pipe for underground drip irrigation.
  • the invention intercepts the water outlet of the dripper, and designs an elastic ring to protect the water outlet, effectively solving the problem of negative pressure suction plugging and root invasion and clogging of the dripper, and has the advantages of simple structure, convenient installation and low cost. The advantages.

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  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental Sciences (AREA)
  • Sewage (AREA)
  • Nozzles (AREA)

Description

防止地下滴灌系统负压及根系堵塞的装置 技术领域
本发明涉及一种用于地下滴灌的防堵塞装置， 特别涉及一种防止地下滴 灌系统负压及根系堵塞的装置。
背景技术
地下滴灌是由地面滴灌发展而来的一种更为节水的灌溉技术， 它通过埋 于地下一定深度处 （通常埋设深度为 20— 40cm) 的毛管和灌水器 （亦称为滴 头） 在作物的根区直接供水， 从而减小了水分的表土蒸发损失， 提高了灌溉 水的利用效率。 滴头 （亦称为灌水器） 是滴灌毛管上的最关键部件， 其作用 是使有压水流通过其内部流道充分消能， 以稳定、 均匀的低流量滴入土壤。 滴头的出水流量很小， 一般单个滴头的流量只有 1一 8L/h， 滴头内部流道结构 多为锯齿形或迷宫形， 流道宽度很窄， 通常仅为 0. 3-2mm左右。 此外， 滴头 出水孔也很小， 一般只有 0. 5〜1. 2mm左右， 因此滴头的致命弱点是极易被污 物堵塞而导致报废。
负压吸泥堵塞和根系入侵堵塞是造成埋地的滴头堵塞的两个最主要因 素。 在地下滴灌条件下， 滴头处在一个被土壤及作物根系所包围的环境中。 在地下滴灌系统工作时， 管网内的水压力 （由水泵提供） 大于大气压力 Pa, 此时滴头可正常出流， 为作物根系供水。 当供水量满足需求， 地下滴灌系统 关闭阀门停止供水时， 即关闭水泵时， 由于管网中压力的突然降低， 使滴灌 毛管内外产生逆向压差， 滴灌毛管内的压力小于大气压力 Pa, 即负压状态， 将造成滴头周围土壤细颗粒被吸入滴头流道内部而引起堵塞。 这种堵塞就是 地下滴灌系统的负压吸泥堵塞。
为解决负压堵塞问题， 一些学者尝试在滴头出水口处采用反滤料作拦截 防护， 以切断土颗粒进入滴头流道内的必由途径。 具体做法是分别选用无纺 布和粗砂两种材料作反滤料进行了田间对比试验， 其具体方案为： 将 100g针 剌无纺布， 剪裁成 3cm X 3cm小片， 包裹在孔口上； 另一种是将粗砂过筛， 除 去粉粒、 细砂粒， 洗去粘粒， 将其装入用 Imm X lmm 尼龙网做成的 5cm X 5cm 袋中， 再将砂袋放在出水口上防护。 连续运行多年的试验结果表明， 两种反 滤材料均可取得一定的防负压堵塞的效果。 比较而言， 粗砂材料的抗负压堵 塞效果要优于无纺布材料。 若采用无纺布， 运行一段时间后， 可能产生出流 不畅现象。 然而， 反滤料法需要对各个滴头逐一进行人工包裹处理， 且操作 程序过于繁杂， 因此工作量过大是其无法克服的缺点。
针对地下滴灌的负压吸泥问题， 还有些是从滴头内部流道入手， 设计了 一种内镶式压力补偿滴头。 例如， 中国实用新型专利 "地下滴灌灌水器"， 其 授权公开号为 CN2403233 , 滴头流道末端带有一个硅橡胶材质的压力补偿片， 该压力补偿片能根据系统工作压力变化的程度自动调节过流断面的大小， 确 保出流的均匀性； 当滴头入口处的压力小于零时， 即灌溉停止出现负压时， 压力补偿片由于弹性自动收缩而紧压在流道末端的凸缘上， 完全锁闭流道， 从而避免土壤颗粒被吸入滴头流道内。 但此种滴头的结构过于复杂， 需要对 当前的生产线进行大规模改造， 使得滴头的生产成本上升， 因此并不具备市 场前景。
另外， 采用地下滴灌系统进行灌溉时， 滴头附近的土壤含水量较高， 由 于作物根系的向水生长性， 作物的根系会向滴头处集聚， 部分根系有可能会 伸入滴头出水口， 造成滴头的根系堵塞。 为避免作物根系伸入滴头内部， 在 灌溉系统运行阶段， 以往主要通过在灌溉水中定期注入少量氯化物、 酸液或 氟乐灵等方法来杀死滴头附近小范围内的根系来缓解滴头的根系堵塞问题。 但这些化学物质的频繁施加， 无疑会导致灌溉系统运行管理的劳动强度增大， 同时化学物质的大量使用会对土壤造成一定的污染。近年来， 美国的 Geof low 公司针对根系入侵堵塞问题开发了一种专用滴头， 该公司在生产滴头的塑料 材料中溶入特定的挥发性除草剂， 滴头地埋以后， 塑料中的除草剂将按一定 速率以蒸汽形式释放到滴头周围土壤中， 从而在滴头附近的小范围形成一个 不利于作物根系发育的土壤环境， 抑制根系向滴头附近生长， 使滴头的本身 产生斥根性。 但这种滴头在运输、 安装及库房储存过程中， 同样会缓慢释放 出含除草剂的有毒气体而造成环境污染。
目前国内外地下滴灌所使用的滴头一般由滴头进水口、 滴头流道和滴头 出水口三部分组成， 有压水流通过滴头进水口进入滴头流道内， 经滴头流道 充分消能， 再通过滴头出水口入渗到周围的土壤中。 因此滴头的出水口是连 接滴头流道与滴头外部土壤间的通道， 也是在灌溉系统供水停止时滴头周围 的土壤颗粒 （在负压作用下） 被吸入滴头流道内部的唯一途径； 同时， 也是 作物根系伸入滴头的唯一途径。 因此在滴头出水口处设置屏障， 切断土颗粒 及作物根系进入滴头内部的这一途径即可有效解决滴头的负压堵塞和根系堵 塞问题。 根据上述机理， 研制出一种防止地下滴灌系统负压及根系堵塞的装 置是本发明的宗旨。
发明内容
本发明的目的是针对上述现有技术的缺陷，提供了一种防止地下滴灌系 统负压及根系堵塞的装置， 具有结构简单、 安装方便且成本低廉的优点， 并 且能够有效解决滴灌过程中的负压吸泥和根系入侵问题。
为了实现上述目的本发明采取的技术方案是： 一种防止地下滴灌系统负 压及根系堵塞的装置， 是设置在所述地下滴灌系统中的滴头出水口外部的弹 性部件。在不灌溉时， 即自然状态下， 滴灌管内的压力和大气压力 pa相等， 此时弹性部件与出水口紧密贴， 与所述滴头过盈配合 （过盈量较小）， 使滴 头出水口处于关闭状态。 当水泵开启后， 即地下滴灌系统开始工作， 滴灌管 内的水压力逐渐增大， 当滴灌管内的水压力大于大气压力并达到某一设定 值 Pw时 （Pw值的大小与所选用弹性部件的材料有关， 但由于水压力远大 于弹性部件的弹性量， 一般情况下可忽略弹性部件的弹性量）， 弹性部件在 压力的作用下发生弹性变形， 弹性部件与出水口脱开， 即弹性部件被水流 的压力顶起、 与出水口间出现间隙， 使水流顺利出流。 当水泵停机， 即滴 灌结束， 地下滴灌系统关闭的瞬间， 滴灌管内的压力将迅速由 Pw减小至 Pn (Pw>Pa>Pn) , 此时弹性部件则自动复位， 与滴头出水口再次紧密贴和（即 恢复至过盈配合状态， 但过盈量较大）， 从而锁闭滴头出水口， 防止吸入土 壤微颗粒。 并且 Pn值越小， 弹性部件与出水口结合的愈紧密。
综上所述， 弹性部件仅在灌溉过程与滴头出水口分离， 而其它时段弹 性部件均贴和在滴头出水口上， 锁闭了作物根系伸入滴头内部的通道， 因 此可以有效防止滴头的根系入侵堵塞问题。 此外， 由于弹性部件对滴头出 水口的防护作用， 特别是在易出现负压吸泥的灌溉系统关闭的瞬间， 弹性 部件与滴头出水口亦紧密贴和， 锁闭了滴头出水口， 因此可以有效避免滴 头的负压吸泥堵塞问题。
所述弹性部件为弹性圈或弹性片。
本发明的有益效果是：相比现有技术，本发明从滴头出水口处进行拦截， 设计了一种弹性圈对出水口进行了防护， 有效解决了滴头的负压吸泥堵塞 和根系入侵堵塞问题， 具有结构简单、 安装方便且成本低廉的优点。
附图说明
图 1是本发明所述装置的安装示意图；
图 2是测定安装有本发明的滴头的抗负压性能装置的示意图；
图 3是安装本发明所述弹性圈的滴头的抗负压堵塞性能的测定图。
图中： 1 滴灌毛管、 2 滴头、 3 滴头出水口、 4.弹性圈， 10加装了弹 性圈的滴头试样、 20真空表、 30 真空泵接入点、 40 空气储箱。
具体实施方式
下面结合附图和具体实施例对本发明作进一歩说明， 但不作为对本发明 的限定。
如图 1所示的一种防止地下滴灌系统负压及根系堵塞的装置， 是设置在 所述地下滴灌系统中滴灌毛管 1的滴头出水口 3外部的弹性部件。 所述弹性 部件为弹性圈 4或弹性片。即当滴灌毛管 1为管状时， 滴头 2的滴头出水口 3 外套接弹性圈 4 (参见图 1 ) ; 当滴灌毛管 1为带状时， 滴头 2的滴头出水口 3 外粘接有弹性片， 弹性片的上下两端粘接在滴头出水口的上下两端、 中间为 自由状态 （图中未示出）。
下面以弹性圈为例， 加以说明。 为检测本发明应用效果， 在滴灌市场上 随即选择了一根带有圆柱形滴头的滴灌毛管 1，然后在滴灌毛管 1上的滴头出 水口 3位置处安装了弹性圈 4， 并根据滴灌毛管检测的标准方法， 对加装弹性 圈后的滴头试样 10性能进行了检测。 其中， 本次所选用的滴灌毛管的尺寸为 参数为： 直径为 16mm， 滴头出水口直径为 0. 6mm。 所加装的弹性圈由硅胶制 成， 其直径为 15. 9mm， 弹性圈的厚度为 lmm， 宽度为 0. 8mm。 弹性圈的横断面 为矩形。 所述弹性圈 4的横断面还可以采用圆形、 菱形等常见几何形状。
为检测所述弹性圈对负压吸泥的防护效果， 采用如图 2所示的试验装置
(负压吸引器）， 图中： 10为加装了弹性圈的滴头试样、 20为真空表、 30为 真空泵接入点、 40 为空气储箱。 对加装弹性圈后的滴头的抗负压堵塞性能 进行了室内测试。 该设备可对供试滴头施加 0〜80Kpa范围内的任何负压。 实 测中将随即抽取的 25个加装了弹性圈的滴头试样 10逐一与负压吸引器的测 试口连接， 通过真空泵分级产生 20Kpa、 40 Kpa、 60 Kpa、 和 80 Kpa的测试 负压， 相应完成不同压力下的滴头抗负压性能测试工作。 当达到每个测试负 压值后， 进行保压试验， 每隔 5min观测一次真空表读数的变化情况， 持续时 间 40min。 如图 3所示， 测试结果表明， 所有加装弹性圈的滴头试样 10， 在 规定的测试时间范围内， 真空表 20的读数均保持在稳定状态。 弹性圈的加装 保证了其在负压条件下工作时， 没有空气能够从滴头的出水孔处进入流道， 这就意味着滴头四周的土壤颗粒无法被吸入流道， 加装弹性圈后的滴头具备 了良好的防负压堵塞性能。
为进一歩测试加装弹性圈的滴头的效果， 在北京 XX灌溉试验基地将该滴 头用于草坪的灌溉试验， 经过持续一年的连续观测， 草坪草的生长正常， 高 矮整齐。 说明这种加装了弹性圈的滴头具有较好的性能， 灌水的均匀度较好， 可充分满足作物的需求。 一年后， 随机从土壤中挖出 25个滴头并剖开滴头流 道， 未发现滴头内有根系残留， 说明加装弹性圈的滴头也具有较好的抗根系 堵塞效果。
故本发明的优势在于：
1. 在滴头出水口处加装弹性圈可以有效解决地埋滴头的负压吸泥堵塞 和根系入侵堵塞问题；
2. 该弹性部件结构简单， 成本低廉， 安装方便， 易于实现生产线安装；
3. 该弹性部件可作为现有滴灌毛管的一种可选零组件。 让客户有更大 的选择余地， 如果客户需要进行地面地灌， 则不需购买此弹性圈； 如果客 户需要地下滴灌系统， 只需在原基础上再额外加装一个弹性圈即可将普通 滴灌管改造为地下滴灌专用滴灌管。
本发明从滴头出水口处进行拦截， 设计了一种弹性圈对出水口进行了 防护，有效解决了滴头的负压吸泥堵塞和根系入侵堵塞问题，具有结构简单、 安装方便且成本低廉的优点。
以上所述的实施例， 只是本发明较优选的具体实施方式的一种， 本领域 的技术人员在本发明技术方案范围内进行的通常变化和替换都应包含在本发 明的保护范围内。

Claims

权 利 要 求 书
1. 一种防止地下滴灌系统负压及根系堵塞的装置， 其特征在于： 是设置 在所述地下滴灌系统中的滴头出水口外部的弹性部件； 自然状态下， 弹性部 件与所述滴头过盈配合， 使滴头出水口处于关闭状态； 所述地下滴灌系统工 作并达到压力设定值时， 弹性部件在压力的作用下发生弹性变形， 弹性部 件与出水口脱开， 水流顺利出流； 滴灌结束， 所述地下滴灌系统内的压力减 小， 弹性部件自动复位并与所述滴头出水口再次紧密贴和。
2. 根据权利要求 1所述的防止地下滴灌系统负压及根系堵塞的装置， 其 特征在于： 所述弹性部件为弹性圈或弹性片。
PCT/CN2010/070310 2009-01-22 2010-01-21 防止地下滴灌系统负压及根系堵塞的装置 WO2010083765A1 (zh)

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