蠕動泵軟管選擇的要素
蠕(ru)動泵(beng)(beng)軟管(guan)是(shi)蠕(ru)動泵(beng)(beng)的重要部件之一(yi)，而zui終用戶卻經(jing)常錯選管(guan)材，致使(shi)其不適于所需應用場合(he)。有(you)些用戶甚至用普通管(guan)道來代替蠕(ru)動泵(beng)(beng)軟管(guan)，以致造成災難(nan)性后果。隨著市(shi)場上(shang)蠕(ru)動泵(beng)(beng)軟管(guan)種類的日益增多，也使(shi)泵(beng)(beng)管(guan)挑選難(nan)度增大。
蠕(ru)動(dong)(dong)泵(beng)因(yin)其無污(wu)染泵(beng)送(song)特性(xing)及所需較少維護而(er)日(ri)趨普及。然而(er)，當設計(ji)或購買蠕(ru)動(dong)(dong)泵(beng)系統時，不(bu)少工(gong)程師(shi)卻常會忽略一個重(zhong)要(yao)的部件----蠕(ru)動(dong)(dong)泵(beng)泵(beng)管。
一、化學相容性
管材(cai)須與(yu)需泵送流(liu)體(ti)具(ju)有(you)(you)化(hua)學相容(rong)性(xing)(xing)，才能(neng)(neng)具(ju)有(you)(you)良好的泵送性(xing)(xing)能(neng)(neng)及安全性(xing)(xing)能(neng)(neng)。隨著(zhu)市場上管材(cai)的日益(yi)增(zeng)多----有(you)(you)些蠕動泵機型的可用管材(cai)多達15種----所(suo)以用戶總能(neng)(neng)找到一(yi)種合適的管材(cai)與(yu)特定(ding)流(liu)體(ti)具(ju)有(you)(you)化(hua)學相容(rong)性(xing)(xing)。
許多泵(beng)(beng)管(guan)(guan)(guan)(guan)供(gong)應(ying)商會提供(gong)化(hua)學(xue)(xue)(xue)相(xiang)容性表(biao)。但工程師們須注意(yi)，應(ying)使用專(zhuan)為泵(beng)(beng)管(guan)(guan)(guan)(guan)制(zhi)(zhi)定(ding)的(de)化(hua)學(xue)(xue)(xue)相(xiang)容性表(biao)，而(er)不(bu)是(shi)為普通(tong)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)制(zhi)(zhi)定(ding)的(de)化(hua)學(xue)(xue)(xue)相(xiang)容性表(biao)。因為普通(tong)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)與化(hua)學(xue)(xue)(xue)物質只(zhi)有一般性接(jie)觸，而(er)蠕動(dong)泵(beng)(beng)泵(beng)(beng)管(guan)(guan)(guan)(guan)是(shi)在壓力(li)條件下(xia)與化(hua)學(xue)(xue)(xue)流體(ti)接(jie)觸，所以，普通(tong)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)的(de)化(hua)學(xue)(xue)(xue)相(xiang)容性級別與蠕動(dong)泵(beng)(beng)泵(beng)(beng)管(guan)(guan)(guan)(guan)的(de)化(hua)學(xue)(xue)(xue)相(xiang)容性級別不(bu)能等同。因此，應(ying)只(zhi)參考(kao)泵(beng)(beng)管(guan)(guan)(guan)(guan)，而(er)不(bu)是(shi)一般管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)與相(xiang)關物質的(de)化(hua)學(xue)(xue)(xue)相(xiang)容性級別，否則會使泵(beng)(beng)管(guan)(guan)(guan)(guan)失效或破損裂(lie)滲(shen)漏，以致造(zao)成泵(beng)(beng)的(de)損壞或危險(xian)性事故。
zui終用戶(hu)在參閱(yue)化(hua)學相容性表時應(ying)將(jiang)溶(rong)(rong)液的(de)每一種(zhong)(zhong)成分，而不(bu)僅是主要(yao)成分拿來與(yu)欲使用的(de)管(guan)材進行相容性核(he)查。某些(xie)酸液或溶(rong)(rong)劑(ji)在與(yu)泵管(guan)接觸數(shu)(shu)小時或數(shu)(shu)日后(hou)，哪怕只是微(wei)量(liang)，也會對泵管(guan)造成足夠的(de)破壞。zui終用戶(hu)應(ying)核(he)查溶(rong)(rong)液中的(de)每一種(zhong)(zhong)化(hua)學物質，以確保(bao)其都能與(yu)所選擇的(de)泵管(guan)相容。
另請牢記(ji)：泵管的抗化學(xue)能(neng)力隨(sui)著溫(wen)度增高(gao)而降(jiang)低。有些化學(xue)物質雖然在(zai)室溫(wen)下對泵管不構成影(ying)響，但(dan)當溫(wen)度升(sheng)高(gao)到一(yi)定(ding)程(cheng)度時(shi)，就會對泵管造(zao)成損害。在(zai)化學(xue)相(xiang)容(rong)性(xing)表(biao)中一(yi)定(ding)要注(zhu)明特(te)定(ding)的環境條件限定(ding)，特(te)別是溫(wen)度限定(ding)，才可用來確定(ding)化學(xue)相(xiang)容(rong)性(xing)。
如果某一化(hua)學(xue)物(wu)質未(wei)被列入化(hua)學(xue)相容(rong)性表中(zhong)，或如果某工廠(chang)的(de)運行環境條件與表中(zhong)規定的(de)條件差別太(tai)大，可采用(yong)(yong)浸(jin)泡試驗(yan)來獲得更可靠(kao)的(de)信息(xi)。在確定化(hua)學(xue)兼(jian)容(rong)性時，若沒有(you)其它信息(xi)可參(can)考，則可采用(yong)(yong)此(ci)法。
浸泡試(shi)(shi)(shi)驗(yan)步(bu)驟如下(xia)：取一(yi)小段(duan)泵(beng)管(guan)，對(dui)其稱重(zhong)(zhong)量、測(ce)直徑和(he)長度。然后(hou)(hou)(hou)將泵(beng)管(guan)放入(ru)一(yi)個裝有相關化(hua)學物(wu)質(zhi)的封閉容器中浸泡48小時。將此管(guan)取出洗凈晾(liang)干，稱重(zhong)(zhong)量和(he)測(ce)尺寸，記錄下(xia)前后(hou)(hou)(hou)兩次測(ce)量的變化(hua)量。還應檢(jian)查泵(beng)管(guan)是否(fou)出現(xian)(xian)軟化(hua)或(huo)脆化(hua)跡象，這類跡象表明化(hua)學物(wu)質(zhi)已對(dui)泵(beng)管(guan)構成侵害。預(yu)選出一(yi)種或(huo)數種管(guan)材后(hou)(hou)(hou)，即(ji)可進行(xing)泵(beng)送試(shi)(shi)(shi)驗(yan)。應將每種候選泵(beng)管(guan)試(shi)(shi)(shi)樣(yang)放入(ru)工廠實際環境條件下(xia)進行(xing)試(shi)(shi)(shi)運行(xing)，并密切(qie)觀察測(ce)試(shi)(shi)(shi)結果(guo)。如果(guo)泵(beng)管(guan)在試(shi)(shi)(shi)運行(xing)后(hou)(hou)(hou)未出現(xian)(xian)退色、腫脹(zhang)、裂紋、喪失流(liu)動性(xing)、或(huo)其它(ta)惡(e)化(hua)跡象，則證明其與(yu)該(gai)流(liu)體(ti)相容。
請記住，為挑選合適(shi)的(de)管材，不論是查閱相容性表，還(huan)是做物理試驗，還(huan)是兩種方式并用，zui終(zhong)責任(ren)都應由(you)zui終(zhong)用戶自行承擔(dan)。細致(zhi)的(de)分析和測試才(cai)能確保正確的(de)測試結果(guo)，從而避免泵的(de)損(sun)壞及確保人身(shen)、財產安全(quan)。
不同(tong)管(guan)材(cai)與溶(rong)液之間，化(hua)(hua)學(xue)(xue)相容性相差很(hen)大(da)。但(dan)也有一(yi)些(xie)材(cai)質對大(da)多數化(hua)(hua)學(xue)(xue)物(wu)(wu)質都有*的(de)(de)抵(di)抗(kang)能力。例如，Viton氟橡膠泵(beng)管(guan)可(ke)抵(di)抗(kang)多種(zhong)(zhong)無機化(hua)(hua)學(xue)(xue)物(wu)(wu)質，甚至一(yi)些(xie)有機化(hua)(hua)學(xue)(xue)物(wu)(wu)質。又如，聚(ju)四氟乙(yi)烯(xi)(PTFE)泵(beng)管(guan)幾乎可(ke)與所有化(hua)(hua)學(xue)(xue)物(wu)(wu)質相容。但(dan)聚(ju)四氟乙(yi)烯(xi)泵(beng)管(guan)是一(yi)種(zhong)(zhong)剛性管(guan)道，需(xu)采用(yong)一(yi)種(zhong)(zhong)泵(beng)頭。在需(xu)泵(beng)送多種(zhong)(zhong)腐蝕性化(hua)(hua)學(xue)(xue)物(wu)(wu)質的(de)(de)場合(he)中，能抗(kang)多種(zhong)(zhong)化(hua)(hua)學(xue)(xue)物(wu)(wu)質的(de)(de)管(guan)材(cai)應(ying)該是選擇(ze)。
二、壓力(li)
高壓泵(beng)管的出現使(shi)得蠕動(dong)泵(beng)的應(ying)用范圍擴展至(zhi)的應(ying)用領域，包括(kuo)過濾。
一(yi)(yi)(yi)個流體(ti)輸送系(xi)統(tong)的(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)源可以(yi)有所不(bu)(bu)同。當推動流體(ti)穿(chuan)過(guo)(guo)一(yi)(yi)(yi)個過(guo)(guo)濾器、或(huo)(huo)推動流體(ti)通過(guo)(guo)一(yi)(yi)(yi)個流量儀(yi)或(huo)(huo)閥門、或(huo)(huo)泵(beng)(beng)(beng)送流體(ti)進(jin)入一(yi)(yi)(yi)個加壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)反應容器時(shi)，就(jiu)會(hui)產生背壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)。用戶在(zai)選(xuan)擇管(guan)材前，應首先確信已經弄清了系(xi)統(tong)中(zhong)所有的(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)源，并已獲得系(xi)統(tong)總壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)的(de)(de)(de)(de)實測值(zhi)(zhi)。用戶在(zai)為(wei)蠕(ru)動泵(beng)(beng)(beng)挑選(xuan)泵(beng)(beng)(beng)管(guan)時(shi)，應確保系(xi)統(tong)中(zhong)的(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)不(bu)(bu)要超(chao)過(guo)(guo)泵(beng)(beng)(beng)管(guan)的(de)(de)(de)(de)推薦(jian)(jian)工(gong)作壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)。如果(guo)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)過(guo)(guo)高，泵(beng)(beng)(beng)管(guan)就(jiu)會(hui)鼓脹，與泵(beng)(beng)(beng)頭配合不(bu)(bu)良，從而導致過(guo)(guo)快(kuai)磨損(sun)和(he)失效。系(xi)統(tong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)大(da)大(da)超(chao)過(guo)(guo)泵(beng)(beng)(beng)管(guan)的(de)(de)(de)(de)承受(shou)能力(li)(li)(li)(li)(li)時(shi)，甚至會(hui)使泵(beng)(beng)(beng)管(guan)爆裂，噴出流體(ti)，危及安(an)全。選(xuan)定(ding)一(yi)(yi)(yi)種(zhong)管(guan)材后，使用時(shi)應確保將壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)維(wei)持在(zai)制造廠家(jia)推薦(jian)(jian)的(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)范圍之內。如果(guo)該系(xi)統(tong)超(chao)過(guo)(guo)zui大(da)工(gong)作壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)，可安(an)裝(zhuang)(zhuang)一(yi)(yi)(yi)種(zhong)簡單的(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)緩(huan)釋閥或(huo)(huo)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)開(kai)關，以(yi)防過(guo)(guo)量壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)的(de)(de)(de)(de)蓄積。壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)緩(huan)釋閥的(de)(de)(de)(de)作用是：當系(xi)統(tong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)超(chao)過(guo)(guo)設定(ding)值(zhi)(zhi)時(shi)，便(bian)向(xiang)大(da)氣中(zhong)排氣，使系(xi)統(tong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)降到安(an)全水平(ping)。也可使用一(yi)(yi)(yi)種(zhong)復雜(za)一(yi)(yi)(yi)些的(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)開(kai)關，當壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)值(zhi)(zhi)超(chao)過(guo)(guo)設定(ding)值(zhi)(zhi)時(shi)，其會(hui)通過(guo)(guo)一(yi)(yi)(yi)個繼電器來關閉設備或(huo)(huo)鳴(ming)響報警裝(zhuang)(zhuang)置。當系(xi)統(tong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)超(chao)過(guo)(guo)安(an)全線時(shi)，上述兩種(zhong)方式均有利于安(an)全。
三(san)、溫(wen)度(du)
泵管(guan)(guan)的工作(zuo)溫(wen)度(du)(du)(du)范圍是另(ling)一個需考慮的重要因素。有(you)些管(guan)(guan)材(cai)(cai)如硅橡膠具有(you)較寬溫(wen)度(du)(du)(du)承受范圍，對高(gao)溫(wen)、低溫(wen)過程均適宜;而有(you)些管(guan)(guan)材(cai)(cai)如Tygon¯及C-Flex¯則只適于某一較小(xiao)的溫(wen)度(du)(du)(du)范圍。zui終用(yong)戶在選擇管(guan)(guan)材(cai)(cai)前，應先弄清系統(tong)中的zui高(gao)溫(wen)度(du)(du)(du)和zui低溫(wen)度(du)(du)(du)，然后確保所(suo)選泵管(guan)(guan)安全工作(zuo)于此溫(wen)度(du)(du)(du)區間。在需逐漸提高(gao)溫(wen)度(du)(du)(du)的應用(yong)場(chang)合，zui終用(yong)戶應考慮溫(wen)度(du)(du)(du)對泵管(guan)(guan)抗化學能力及承壓能力的影響。溫(wen)度(du)(du)(du)增高(gao)時，泵管(guan)(guan)的承壓能力會降低。
四(si)、尺寸
隨(sui)著泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)頭(tou)中每一個輥(gun)子(zi)壓(ya)(ya)過泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)，蠕動(dong)(dong)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)便會泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)送一定(ding)(ding)量(liang)的(de)(de)(de)流(liu)(liu)體，因(yin)此泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)直接(jie)關(guan)系到泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)送流(liu)(liu)量(liang)，也就(jiu)(jiu)(jiu)是(shi)說，對流(liu)(liu)體輸送系統(tong)的(de)(de)(de)運(yun)行影響(xiang)很(hen)(hen)大。泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)是(shi)設計蠕動(dong)(dong)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)時需(xu)重點考慮的(de)(de)(de)部分。需(xu)計算出(chu)(chu)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)或(huo)(huo)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)范圍。這里的(de)(de)(de)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)主要(yao)指泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)內徑(jing)和璧(bi)厚。內徑(jing)決(jue)定(ding)(ding)轉子(zi)每轉一圈(quan)所(suo)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)送流(liu)(liu)體的(de)(de)(de)量(liang)，而(er)璧(bi)厚則決(jue)定(ding)(ding)每次碾(nian)壓(ya)(ya)后，泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)恢復(fu)原始形狀的(de)(de)(de)能(neng)(neng)力，這一能(neng)(neng)力在(zai)很(hen)(hen)大程度(du)上影響(xiang)著泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)使(shi)(shi)用(yong)(yong)壽命(ming)。泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)相對于泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)頭(tou)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)太(tai)小(xiao)，泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)頭(tou)就(jiu)(jiu)(jiu)不能(neng)(neng)卡牢泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)，泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)就(jiu)(jiu)(jiu)會被拉出(chu)(chu)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)頭(tou);而(er)且泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)太(tai)小(xiao)，泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)頭(tou)中的(de)(de)(de)輥(gun)子(zi)就(jiu)(jiu)(jiu)壓(ya)(ya)不住泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)，就(jiu)(jiu)(jiu)會造成泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)送流(liu)(liu)量(liang)不足以(yi)或(huo)(huo)*失(shi)效。而(er)如果泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)太(tai)大，多余(yu)的(de)(de)(de)管(guan)(guan)(guan)(guan)(guan)(guan)材就(jiu)(jiu)(jiu)會在(zai)輥(gun)子(zi)與(yu)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)殼之間或(huo)(huo)輥(gun)子(zi)與(yu)咬合床(chuang)之間產生褶皺，導(dao)致(zhi)過快磨損和過早失(shi)效。zui終用(yong)(yong)戶在(zai)選擇泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)時，應遵從制(zhi)造廠(chang)家的(de)(de)(de)建(jian)議，以(yi)確保系統(tong)功能(neng)(neng)發揮良好。在(zai)要(yao)求(qiu)較高性(xing)的(de)(de)(de)一些應用(yong)(yong)場合(如化學(xue)劑量(liang)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng))，泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)的(de)(de)(de)作用(yong)(yong)就(jiu)(jiu)(jiu)更(geng)加突出(chu)(chu)。尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)稍(shao)有偏(pian)差(cha)就(jiu)(jiu)(jiu)會導(dao)致(zhi)流(liu)(liu)量(liang)或(huo)(huo)分配量(liang)偏(pian)差(cha)太(tai)大而(er)不合格。雖然(ran)有些制(zhi)造廠(chang)家提供的(de)(de)(de)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)與(yu)推薦尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)很(hen)(hen)“接(jie)近(jin)”，“看上去一樣”，但往往還是(shi)有差(cha)距的(de)(de)(de)。所(suo)以(yi)為了使(shi)(shi)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)系統(tong)達到性(xing)能(neng)(neng)和工作精度(du)，用(yong)(yong)戶應采用(yong)(yong)與(yu)廠(chang)家推薦尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)*一致(zhi)的(de)(de)(de)泵(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)(beng)管(guan)(guan)(guan)(guan)(guan)(guan)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)。
五(wu)、公(gong)差(cha)
公差(cha)即泵(beng)管(guan)尺寸(cun)的(de)(de)允許誤差(cha)。公差(cha)越小(xiao)，泵(beng)管(guan)的(de)(de)性能偏(pian)(pian)差(cha)就(jiu)越小(xiao)，一(yi)致性和重復性就(jiu)越好。公差(cha)越大，泵(beng)管(guan)的(de)(de)性能便越不(bu)穩定(ding)。有些(xie)泵(beng)管(guan)的(de)(de)制(zhi)造公差(cha)極(ji)小(xiao)，其尺寸(cun)偏(pian)(pian)差(cha)在(zai)擠塑(su)成形時就(jiu)受到嚴(yan)格的(de)(de)控(kong)制(zhi)。制(zhi)造公差(cha)較(jiao)小(xiao)的(de)(de)泵(beng)管(guan)雖(sui)稍微貴一(yi)些(xie)，但比起泵(beng)送性能的(de)(de)提高幅度，這點花費還是值(zhi)得的(de)(de)。
六、泵管(guan)的(de)平均(jun)壽(shou)命
蠕動泵(beng)(beng)所面臨的(de)(de)(de)條件(jian)較(jiao)(jiao)為惡劣，所以內在品質(zhi)較(jiao)(jiao)優的(de)(de)(de)管(guan)(guan)材(cai)，尤其(qi)是(shi)回彈性(xing)(xing)能較(jiao)(jiao)好的(de)(de)(de)管(guan)(guan)材(cai)才會有(you)(you)較(jiao)(jiao)長(chang)的(de)(de)(de)使用(yong)壽命(ming)。長(chang)遠看，管(guan)(guan)材(cai)使用(yong)壽命(ming)越(yue)長(chang)，運行成(cheng)本(ben)越(yue)低。泵(beng)(beng)管(guan)(guan)更換次數越(yue)少(shao)，維護(hu)成(cheng)本(ben)和停機時(shi)間越(yue)少(shao)。泵(beng)(beng)管(guan)(guan)出現滲漏和爆裂(lie)的(de)(de)(de)可能性(xing)(xing)也(ye)越(yue)少(shao)。總之，泵(beng)(beng)管(guan)(guan)使用(yong)壽命(ming)越(yue)長(chang)，泵(beng)(beng)送總成(cheng)本(ben)就越(yue)低。泵(beng)(beng)管(guan)(guan)制(zhi)造廠家應(ying)提供(gong)試驗(yan)數據來證(zheng)明其(qi)所宣稱的(de)(de)(de)泵(beng)(beng)管(guan)(guan)壽命(ming)。有(you)(you)些廠家在其(qi)手冊(如(ru)《Cole-Parmer儀器公司Masterflex泵(beng)(beng)資料(liao)大(da)全(quan)》中發布了有(you)(you)關(guan)信(xin)息。無論如(ru)何，工程(cheng)師(shi)在設(she)計(ji)一(yi)個系統時(shi)，應(ying)對(dui)有(you)(you)關(guan)管(guan)(guan)材(cai)的(de)(de)(de)平均壽命(ming)有(you)(you)所了解，這(zhe)樣才能幫(bang)助zui終(zhong)用(yong)戶制(zhi)定(ding)預防(fang)性(xing)(xing)維護(hu)計(ji)劃，以便(bian)在泵(beng)(beng)管(guan)(guan)失效(xiao)以前就能將其(qi)更換。有(you)(you)豐富技術知識(shi)的(de)(de)(de)泵(beng)(beng)管(guan)(guan)供(gong)應(ying)商可針對(dui)特定(ding)應(ying)用(yong)場合為用(yong)戶提供(gong)有(you)(you)用(yong)的(de)(de)(de)信(xin)息，以便(bian)選出合適的(de)(de)(de)泵(beng)(beng)管(guan)(guan)材(cai)料(liao)。
七、透明度
是否應(ying)采用(yong)透(tou)明管道，首先(xian)要(yao)(yao)看操(cao)作員是否需要(yao)(yao)隨(sui)時觀察(cha)管內流體的狀(zhuang)況，還要(yao)(yao)看流體是否對光敏感。如果操(cao)作員需要(yao)(yao)隨(sui)時觀察(cha)管內流體、氣泡、微粒、污(wu)染等情況，則應(ying)選(xuan)用(yong)Tygon聚乙烯或硅橡膠等透(tou)明管材;而如果溶(rong)液不宜曝(pu)光，則應(ying)選(xuan)用(yong)不透(tou)明管材
八(ba)、透(tou)氣(qi)度
對于(yu)一些對氣(qi)體(ti)(ti)敏感的(de)流(liu)體(ti)(ti)，如易(yi)受氧化的(de)流(liu)體(ti)(ti)，或(huo)厭(yan)氧細(xi)胞培養(yang)液(ye)，用(yong)戶應(ying)考慮管(guan)道(dao)的(de)透氣(qi)度因素。總的(de)來(lai)說，硅膠管(guan)的(de)透氣(qi)度zui高。所以對于(yu)不(bu)宜(yi)于(yu)接(jie)觸氣(qi)體(ti)(ti)的(de)流(liu)體(ti)(ti)，應(ying)選用(yong)透氣(qi)度較低的(de)管(guan)材。
九(jiu)、法規許可
對于制(zhi)藥(yao)行(xing)業(ye)(ye)，法規(gui)(gui)認證(zheng)(zheng)至關重要。在該行(xing)業(ye)(ye)，每一件與zui終產品有接觸的物(wu)品都必須符(fu)合(he)專門的標準(zhun)和(he)準(zhun)則(ze)。為此，許多泵(beng)管(guan)材料是嚴格按照(zhao)法規(gui)(gui)要求研制(zhi)出來的。這些(xie)法規(gui)(gui)包(bao)括美國(guo)藥(yao)典(USP)、歐(ou)洲藥(yao)典(EP)、美國(guo)食品及藥(yao)物(wu)管(guan)理局(FDA)、美國(guo)農業(ye)(ye)部(USDA)、及美國(guo)國(guo)家(jia)衛(wei)生基金(jin)會(NSF)。當然，僅宣(xuan)稱某(mou)某(mou)材料符(fu)合(he)某(mou)某(mou)法規(gui)(gui)還是不夠的。泵(beng)管(guan)制(zhi)造廠家(jia)應根據用(yong)戶(hu)要求向用(yong)戶(hu)提(ti)供證(zheng)(zheng)明(ming)該管(guan)道符(fu)合(he)該法規(gui)(gui)的證(zheng)(zheng)書。這樣用(yong)戶(hu)就能提(ti)供必要的證(zheng)(zheng)書，證(zheng)(zheng)明(ming)泵(beng)系統符(fu)合(he)必要的法規(gui)(gui)許可。
十、成(cheng)本
成本幾乎是(shi)制定每(mei)(mei)一(yi)(yi)(yi)個項目方案(an)時都需要(yao)(yao)考慮的(de)(de)因素。正如(ru)選擇其它部件時一(yi)(yi)(yi)樣，用(yong)戶應(ying)對備選泵(beng)(beng)(beng)(beng)管的(de)(de)整個使用(yong)成本進行評估。例(li)如(ru)，某種泵(beng)(beng)(beng)(beng)管每(mei)(mei)英尺價格為2美(mei)元，每(mei)(mei)500小時需更(geng)換(huan)一(yi)(yi)(yi)次;而另一(yi)(yi)(yi)種泵(beng)(beng)(beng)(beng)管每(mei)(mei)英尺價格為1美(mei)元，每(mei)(mei)100小時需更(geng)換(huan)一(yi)(yi)(yi)次;則前者(zhe)的(de)(de)性(xing)價比比后者(zhe)更(geng)高。低質(zhi)泵(beng)(beng)(beng)(beng)管突然破裂會(hui)導致(zhi)貴重流(liu)體流(liu)失或導致(zhi)泵(beng)(beng)(beng)(beng)的(de)(de)損壞(huai)，造(zao)成高成本的(de)(de)停機時間及大(da)量(liang)維修(xiu)、甚至更(geng)換(huan)整個泵(beng)(beng)(beng)(beng)。所(suo)以，*的(de)(de)泵(beng)(beng)(beng)(beng)管不(bu)一(yi)(yi)(yi)定是(shi)的(de)(de)選擇。要(yao)(yao)在品種繁多的(de)(de)泵(beng)(beng)(beng)(beng)管市場上挑(tiao)選出一(yi)(yi)(yi)款理想的(de)(de)泵(beng)(beng)(beng)(beng)管咋看起來(lai)不(bu)大(da)可能(neng)(neng)。然而，只要(yao)(yao)仔(zi)細研(yan)究系(xi)統(tong)要(yao)(yao)求、參比有(you)關(guan)的(de)(de)技術(shu)指(zhi)標、與(yu)具有(you)應(ying)用(yong)知識和經驗的(de)(de)泵(beng)(beng)(beng)(beng)管制造(zao)商(shang)或供應(ying)商(shang)保持密(mi)切溝通，就能(neng)(neng)選定zui適于(yu)相關(guan)泵(beng)(beng)(beng)(beng)系(xi)統(tong)的(de)(de)泵(beng)(beng)(beng)(beng)管。
上海瀚默科技為您提供完整的蠕動泵軟管選型，蠕動泵軟管推薦，蠕動泵軟管驗證等服務。我們提供的蠕動泵軟管產品適用性幾乎涵蓋所有行業的流體處理應用。詳細的產品選型請與我司銷售人員。
下一篇：“第三代橡膠”熱塑性彈性體
儀器設備客服