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計(jì)量泵技術(shù)
您的當(dāng)前位置：巴特首頁 > 技術(shù)支持 > 計(jì)量泵技術(shù) >如何選擇計(jì)量泵？
來源：巴特計(jì)量泵、齒輪泵公司 發(fā)布時間：2013-11-19 10:56:28 瀏覽次數(shù)：次
選型時要注意兩個參數(shù)：流量和壓力，標(biāo)牌上的壓力是計(jì)量泵高正常工作壓力，流量是此壓力下的大流量。計(jì)量泵是單向容積泵，泵腔內(nèi)的壓力大于外界壓力時計(jì)量泵才能打出液體。當(dāng)外界壓力高于標(biāo)牌上的壓力時，計(jì)量泵工作在超負(fù)荷狀態(tài)。如果是電磁隔膜計(jì)量泵，其流量會下降很多，甚至打不出液體；如果是電機(jī)驅(qū)動的計(jì)量泵，電機(jī)有可能過熱損壞。
1、如何選擇計(jì)量泵泵頭的材質(zhì)？
通用的計(jì)量泵泵頭的材質(zhì)：PP,PVC,PTFE及SS316等。
PP：成型容易，造價低，耐酸堿及一定的耐高溫能力（可達(dá) 80oC）
但不適合有機(jī)溶劑，強(qiáng)酸堿及含次氯酸根的液體（濃度受限）
PVC：成型容易，造價低，耐酸堿，但不適合有機(jī)溶劑，強(qiáng)酸堿及高于40oC液體的計(jì)量，不適合食品及飲用水行業(yè)（有毒，食品包裝袋不再采用PVC袋就是證明）
PTFE：適合各種介質(zhì)，耐高溫，但成型困難，造價高
SS316：適合有機(jī)溶劑及高溫液體，但不耐強(qiáng)酸。
2、如何選擇計(jì)量泵單向閥的結(jié)構(gòu)？
單向閥的止回結(jié)構(gòu)：重力止回及彈性止回
重力止回：閥球靠自身的重量返回密封面，形成單向止回結(jié)構(gòu)，密封效果好，耐高壓。
彈性止回：靠橡膠本身的彈性回復(fù)其止回狀態(tài)，造價低，不耐高壓，長時間運(yùn)行后，橡膠老化，止回效果變差，另外酸堿的腐蝕會使其結(jié)構(gòu)變形，惡化止回效果。
市場上意大利產(chǎn)的計(jì)量泵多是彈性止回結(jié)構(gòu)，美國，德國及日本產(chǎn)的 計(jì)量泵為重力止回結(jié)構(gòu)。
RDOSE計(jì)量泵采用重力止回結(jié)構(gòu)。
3、如何選擇重力止回結(jié)構(gòu)的單向閥的閥球及密封球座？
通用的閥球材質(zhì)兩種：玻璃球和陶瓷球
玻璃球：造價低，但部分酸堿內(nèi)的離子會對其造成腐蝕
陶瓷球：造價高，但適合各種酸堿
通用的密封球座：普通塑料球座，橡膠球座及PTFE球座。
普通塑料球座：造價低，部分介質(zhì)會對其腐蝕，長時間運(yùn)行后止回效 果變差。
橡膠球座：造價低，長時間的酸堿腐蝕會改變其形狀，止回效果變差 或堵塞過流通道。（市場上通常發(fā)現(xiàn)的正常計(jì)量泵運(yùn)行一 段時間后打不出藥液的現(xiàn)象就是由其引起的）
PTFE球座：造價高，適合各種液體且永不變形。
RDOSE計(jì)量泵采用陶瓷球及PTFE球座的單向閥
4、如何選擇計(jì)量泵的隔膜？
常用隔膜：復(fù)合隔膜及純PTFE隔膜
復(fù)合隔膜：內(nèi)鑲螺栓的NBR橡膠隔膜的表面貼敷一層PTFE薄膜就構(gòu)成了復(fù)合隔膜，有的在橡膠隔膜內(nèi)還鑲嵌了鋼絲網(wǎng)以增加其強(qiáng)度。此隔膜造價低，彈性形變大，能夠由較小的平面尺寸產(chǎn)生較大的流量，使得電磁鐵的功率減小，降低生產(chǎn)成本。但長時間運(yùn)行時，電磁鐵的熱量會通過輻射及其鑲嵌螺栓的傳導(dǎo)積聚到其橡膠面上，加上高斌率的變形，該隔膜會很快老化破損，所以該類型隔膜的計(jì)量泵都有隔膜破損指示孔。
純PTFE隔膜：由改性的PTFE整體加工完成， 造價相對較高，隔膜形變量也相對較小，但卻使其可以永不損壞。
市場上意大利的計(jì)量泵為純PTFE隔膜，其它廠商的多為復(fù)合隔膜。
RDOSE計(jì)量泵采用純PTFE隔膜。
5、如何選擇計(jì)量泵的軟管接頭？
軟管接頭的材質(zhì)：普通塑料及PTFE
電磁隔膜計(jì)量泵的流量通常比較小，因此其軟管的內(nèi)徑也相對比較小，這使得軟管接頭的壁厚也變得很?。榱吮ＷC流體通經(jīng)，使得接頭的內(nèi)孔不能太?。ｉL時間受到酸堿介質(zhì)的沖刷，普通塑料接頭很容易被腐蝕斷裂，導(dǎo)致軟管連接處泄漏，而PTFE接頭則杜絕了此情況的發(fā)生。
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