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<h1>自動灌溉系統的防凍保護</h1> <div id="jnlz7jl" class="nwdtl_tip"><span>更新時間：2015-04-10</span><span>瀏覽：3358次</span></div> <div id="jpblj5j" class="nwdtl_con"> <p>　灌溉系統的防凍保護，實際上是在冷凍出現前，把管道、閥門、噴頭里的水排出，以防凍害對灌溉系統造成破壞。在不同的氣候條件下，灌溉系統的防凍措施不一樣，但一般不外乎以下四種措施：</p><p>1、采用手動泄水措施，釋放灌溉系統里的水；</p><p>2、采用自動泄水措施，釋放灌溉系統里的水；</p><p>3、采用壓縮空氣法，吹出灌溉系統里的水；</p><p>4、采用管道外包裹防凍材料（一般用于地面管道）。</p><p> 目前國內灌溉工程多采用管路埋入當地凍土層以下，這樣的結果是：系統比較安全，管理比較簡單，但工程量大、投資加大，如北京凍土層深在50cm-80cm，一般工程溝開挖深度在1m左右，新疆地區管路系統埋深一般在1.8m左右。對于灌溉系統來說，防凍的基本步驟是關閉主閥、切斷水源，然后排泄管路里的水，從而達到防凍的目的。 <br> 采用手動泄水措施使用這種辦法，必須確信灌溉系統設計合理、能滿足排水要求。手動泄水閥應安裝在主管路zui低洼的地方，假若系統有多處低洼地，都應該設置手動泄水閥，一般采用球閥、閘閥或帶有堵頭的一段管子，而且應保證施工過程中有一定的坡度條件，方便管道內的水匯集到泄水井。若泄水井安裝在室外，應保證泄水井的干燥（可以采用井底放置礫石）；若在室內應確保排泄的水量不致于溢出水井。方法是：關閉系統主閥，切斷水源，依次打開各輪灌區的控制閥（如電磁閥），減少管路系統水壓力，然后慢慢手動開啟泄水閥。注意：對于主閥門或各分區閥門（如電磁閥、閘閥）里的積水就需要采用壓縮空氣的辦法吹出或采用包裹防凍材料的辦法處理。對于有些園林噴頭（如雨鳥T-Bird、1800系列）有側面和底部進水兩種，當采用側面進水時，可在底側設置自動泄水閥，以防止外殼凍裂；對于齒輪驅動的旋轉噴頭（如雨鳥3500、5004、7005等系列噴頭），里面的積水需要人工排（提起升降體、輕微的晃動或拆除噴頭來解決）或采用壓縮空氣的辦法。 <br> 采用自動泄水措施在灌溉系統主管路安裝手動泄水閥，而不要去采用自動裝置。自動泄水裝置一般安裝在支管路或與噴頭安裝在一起（如采用側面進水的埋藏噴頭）。原理是：每次系統關閉后，自動泄水閥就會泄走噴頭或管路里的水（如雨鳥16A-FDV自動泄水閥，開閥壓力2m、關閥壓力4m）。自動泄水閥若安裝在主管路系統會造成灌溉水的大量浪費。自動泄水閥（1/2"、3/4"陽螺紋接口）應安裝在分區電磁閥的下游低洼地，一般每條支管安裝1-2個。在管理過程中，應定時檢查，以防自動泄水閥堵塞而影響工作。象手動泄水措施一樣，對于管路電磁閥或手動閥門清除里面的積水可用壓縮空氣法、包裹防凍材料或采用閥門拆開的辦法，用干布試擦積水。深圳市谷耐環?？萍加邢薰?span style="color:rgb(110, 110, 110); font-family:simsun; font-size:12px">是集開發、設計、生產、銷售、施工，服務于一體的從事園林灌溉、農業灌溉、噴泉造霧，工礦降塵、庭院景觀和水處理的專業化公司。</span></p> </div> </div> <div id="n7dzzjh" class="prev_next"> <ul> <li><p>上一篇：<a href="/aa137237-Article-234909/">谷耐人造霧系統水處理與安全自動泄壓亮點十足</a></p></li> <li><p>下一篇：<a href="/aa137237-Article-231027/">水霧的形成和分類以及影響</a></p></li> </ul> </div> </div>    <div class="jljt7fh" id="z_Footer"> <div id="dxh7pzh" class="pz_down"> <div id="xpnb5jh" class="w_1200"> <div id="ftddntz" class="footT"> <div id="npnnztb" class="footAddr"> <div id="p7t7trz" class="footTit">深圳市谷耐環保科技有限公司</div> <div id="v7jpdzv" class="dAddr"><img class="ico" 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