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style="color:#191919;font-family:"font-size:16px;background-color:#FFFFFF;">LB-6200型便攜式明渠流量計參照HJ353/HJ354/HJ355-2019中對“便攜明渠流量計比對裝置”的要求進(jìn)行研發(fā)設計，其可應用于在明渠堰槽中對在線(xiàn)流量計進(jìn)行驗收比對工作，適用的堰槽主要是巴歇爾槽、三角堰、矩形堰、等寬堰。那么如何理解這幾種堰槽呢？</span> </p> <p style="font-size:28px;color:#191919;font-family:"background-color:#FFFFFF;"> <p> <img src="https://imgcn5.guidechem.com/img/product/2021/9/11/200852153101754.png" alt="" /> </p> <p> <p style="font-size:16px;color:#191919;font-family:"background-color:#FFFFFF;"> 巴歇爾槽 (Parshall flume)又稱(chēng)巴氏槽，是明渠流量測量的輔助設備，也是現在污廢水排放明渠中應用最廣的堰槽類(lèi)型之一。其一般的流量測量范圍為0.1×10-3～93m3/S。 </p> <p style="font-size:16px;color:#191919;font-family:"background-color:#FFFFFF;"> 巴歇爾槽是文丘里水槽，后者的實(shí)驗是VM.Cone于1915年在美國的科羅拉多洲開(kāi)始進(jìn)行的。1922年F.L.Parshall對此進(jìn)行了根本性的變革，制作了現在通用的巴歇爾槽。以后又多次重復了水力學(xué)實(shí)驗，制成了尺寸為1英寸到50英寸的各種量水槽。巴歇爾槽名字是1929年美國土木學(xué)會(huì )命名的。此后，英國、瑞士、意大利、印度、阿根廷等許多國家也提出了各種類(lèi)型的文丘里水槽的設計方案并進(jìn)行了實(shí)驗，但巴歇爾槽仍是文丘里水槽中最普及的水槽。巴歇爾槽有其他堰槽無(wú)法替代的優(yōu)點(diǎn)：水位損失小(約為堰的四分之一)、水中即使有固態(tài)物質(zhì)也幾乎不沉淀、接近流速的影響小、對下流側的水位影響比較小等，因此它也被用來(lái)測量農業(yè)用水、工業(yè)用水等其它液體的流量。 </p> <p style="font-size:16px;color:#191919;font-family:"background-color:#FFFFFF;"> 三角堰，過(guò)水斷面為三角形缺口，角頂向下，頂角可制成30度、45度、60度、90度及120度，通常采用90度。其特點(diǎn)是，在較小流量時(shí)仍有較大水頭，具有較高量測精度，適于測定較小流量，其優(yōu)點(diǎn)是：制造簡(jiǎn)單，裝設容易，造價(jià)較低，也可廣泛用于水力學(xué)、水工實(shí)驗室及灌排渠道上。三角堰的一般的流量測量范圍為0.2×10-3～1.8m3/S。 </p> <p style="font-size:16px;color:#191919;font-family:"background-color:#FFFFFF;"> 矩形堰，過(guò)水斷面為矩形缺口，要求缺口處尺寸要準確、緣臺平直、光滑，板面光滑、平整、無(wú)扭曲，且堰槽中心線(xiàn)要與渠道的中心線(xiàn)重合，一般的流量測量范圍為1.4×10-3～49m3/S。 </p> <p style="font-size:16px;color:#191919;font-family:"background-color:#FFFFFF;"> 等寬堰，堰定為水平面，堰口寬度與行近渠槽寬度相同。堰板面與矩形行近渠槽水平軸線(xiàn)成90度角，堰板上游面為一平面，在表面上任意兩點(diǎn)間的連線(xiàn)與垂直與軸線(xiàn)的平面之間的斜率應小于1%，其流量測量范圍為0.8×10-3～77m3/S。 </p> <p style="font-size:16px;color:#191919;font-family:"background-color:#FFFFFF;"> 以上幾種堰槽是LB-6200型便攜式明渠流量計可進(jìn)行在線(xiàn)流量計比對的標準堰槽，儀器預存堰槽類(lèi)型，用戶(hù)僅需根據現場(chǎng)實(shí)際堰槽類(lèi)型進(jìn)行選擇并輸入基本參數即可完成流量計的比對驗收工作。 </p> <img src="https://imgcn5.guidechem.com/img/product/2021/9/11/200852153205515.png" alt="" /> </p> </p> </div> <div id="fvkfg1sxx" class="pge_re"> <span>上一篇：<a href="/news/show486212.html">適用于污水驗毒毒情監測的污水水質(zhì)自動(dòng)取樣采樣器 </a></span> <span>下一篇：<a href="/news/show486214.html">全自動(dòng)水質(zhì)采樣器獲深圳計量質(zhì)量檢測研究院頒發(fā)的計量評價(jià)證書(shū)</a></span> </div> <style type="text/css"> .news_tag{margin-top:10px;} .ews_t_t{line-height:45px;margin:0px auto;font-size:16px;height:45px;overflow:hidden;color:#333;font-weight:bold;text-align: left;} .ews_t_tl{overflow:hidden;} .ews_t_tl a{float:left;color:#555;display:block;height:36px;line-height:36px;padding:0px 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