Screw pump/HSNH440-36Z螺桿泵操作管理

Screw pump/HSNH440-36Z螺桿泵操作管理 SNH440R40U8W2 SNH440R46U8W2 SNH440R52U8W2 SNH440R54U8W2 SNF440R40U8W2 SNF440R46U8W2 SNF440R52U8W2 SNF440R54U8W2 SNS440R40U8W2 SNS440R46U8W2 SNS440R52U8W2 SNS440R54U8W2 SNH440R40U8W3 SNH440R46U8W3 SNH440R52U8W3 SNH440R54U8W3 SNF440R40U8W3 SNF440R46U8W3 SNF440R52U8W3 SNF440R54U8W3 SNS440R40U8W3 SNS440R46U8W3 SNS440R52U8W3 SNS440R54U8W3 SNH440R40U8W21 SNH440R46U8W21 SNH440R52U8W21 SNH440R54U8W21 SNF440R40U8W21 SNF440R46U8W21 SNF440R52U8W21 SNF440R54U8W21 SNS440R40U8W21 SNS440R46U8W21 SNS440R52U8W21 SNS440R54U8W21 SNH440R40U8W23 SNH440R46U8W23 SNH440R52U8W23 SNH440R54U8W23 SNF440R40U8W23 SNF440R46U8W23 SNF440R52U8W23 SNF440R54U8W23 SNS440R40U8W23 SNS440R46U8W23 SNS440R52U8W23 SNS440R54U8W23 SNH440R40U12.1W2 SNH440R46U12.1W2 SNH440R52U12.1W2 SNH440R54U12.1W2 SNF440R40U12.1W2 SNF440R46U12.1W2 SNF440R52U12.1W2 SNF440R54U12.1W2 SNS440R40U12.1W2 SNS440R46U12.1W2 SNS440R52U12.1W2 SNS440R54U12.1W2 SNH440R40U12.1W3 SNH440R46U12.1W3 SNH440R52U12.1W3 SNH440R54U12.1W3 SNF440R40U12.1W3 SNF440R46U12.1W3 SNF440R52U12.1W3 SNF440R54U12.1W3 SNS440R40U12.1W3 SNS440R46U12.1W3 SNS440R52U12.1W3 SNS440R54U12.1W3 SNH440R40U12.1W21 SNH440R46U12.1W21 SNH440R52U12.1W21 SNH440R54U12.1W21 SNF440R40U12.1W21 SNF440R46U12.1W21 SNF440R52U12.1W21 SNF440R54U12.1W21 SNS440R40U12.1W21 SNS440R46U12.1W21 SNS440R52U12.1W21 SNS440R54U12.1W21 SNH440R40U12.1W23 SNH440R46U12.1W23 SNH440R52U12.1W23 SNH440R54U12.1W23 SNF440R40U12.1W23 SNF440R46U12.1W23 SNF440R52U12.1W23 SNF440R54U12.1W23 SNS440R40U12.1W23 SNS440R46U12.1W23 SNS440R52U12.1W23 SNS440R54U12.1W23 SNH440R40E6.7W2 SNH440R46E6.7W2 SNH440R52E6.7W2 SNH440R54E6.7W2 SNF440R40E6.7W2 SNF440R46E6.7W2 SNF440R52E6.7W2 SNF440R54E6.7W2 SNS440R40E6.7W2 SNS440R46E6.7W2 SNS440R52E6.7W2 SNS440R54E6.7W2 SNH440R40E6.7W3 SNH440R46E6.7W3 SNH440R52E6.7W3 SNH440R54E6.7W3 SNF440R40E6.7W3 SNF440R46E6.7W3 SNF440R52E6.7W3 SNF440R54E6.7W3 SNS440R40E6.7W3 SNS440R46E6.7W3 SNS440R52E6.7W3 SNS440R54E6.7W3 SNH440R40E6.7W21 SNH440R46E6.7W21 SNH440R52E6.7W21 SNH440R54E6.7W21 SNF440R40E6.7W21 SNF440R46E6.7W21 SNF440R52E6.7W21 SNF440R54E6.7W21 SNS440R40E6.7W21 SNS440R46E6.7W21 SNS440R52E6.7W21 SNS440R54E6.7W21 SNH440R40E6.7W23 SNH440R46E6.7W23 SNH440R52E6.7W23 SNH440R54E6.7W23 SNF440R40E6.7W23 SNF440R46E6.7W23 SNF440R52E6.7W23 SNF440R54E6.7W23 SNS440R40E6.7W23 SNS440R46E6.7W23 SNS440R52E6.7W23 SNS440R54E6.7W23 TRSNH440-36 TRSNH440-40 TRSNH440-42 TRSNH440-46 TRSNH440-51 TRSNH440-54 TRSNF440-36 TRSNF440-40 TRSNF440-42 TRSNF440-46 TRSNF440-51 TRSNF440-54 TRSNS440-36 TRSNS440-40 TRSNS440-42 TRSNS440-46 TRSNS440-51 TRSNS440-54 TRSND440-36 TRSND440-40 TRSND440-42 TRSND440-46 TRSND440-51 TRSND440-54 TRSNK440-36 TRSNK440-40 TRSNK440-42 TRSNK440-46 TRSNK440-51 TRSNK440-54 HTSNH440-36 HTSNH440-40 HTSNH440-42 HTSNH440-46 HTSNH440-51 HTSNH440-54 HTSNF440-36 HTSNF440-40 HTSNF440-42 HTSNF440-46 HTSNF440-51 HTSNF440-54 HTSNS440-36 HTSNS440-40 HTSNS440-42 HTSNS440-46 HTSNS440-51 HTSNS440-54 HTSND440-36 HTSND440-40 HTSND440-42 HTSND440-46 HTSND440-51 HTSND440-54 HTSNK440-36 HTSNK440-40 HTSNK440-42 HTSNK440-46 HTSNK440-51 HTSNK440-54 HSNH440-36Z HSNH440-40Z HSNH440-42Z HSNH440-46Z HSNH440-51Z HSNH440-54Z HSNF440-36Z HSNF440-40Z HSNF440-42Z HSNF440-46Z HSNF440-51Z HSNF440-54Z HSNS440-36Z HSNS440-40Z HSNS440-42Z HSNS440-46Z HSNS440-51Z HSNS440-54Z HSNH440-36NZ HSNH440-40NZ HSNH440-42NZ HSNH440-46NZ HSNH440-51NZ HSNH440-54NZ HSNF440-36NZ HSNF440-40NZ HSNF440-42NZ HSNF440-46NZ HSNF440-51NZ HSNF440-54NZ HSNS440-36NZ HSNS440-40NZ HSNS440-42NZ HSNS440-46NZ HSNS440-51NZ HSNS440-54NZ HSNH440-36W1Z HSNH440-40W1Z HSNH440-42W1Z HSNH440-46W1Z HSNH440-51W1Z HSNH440-54W1Z HSNF440-36W1Z HSNF440-40W1Z HSNF440-42W1Z HSNF440-46W1Z HSNF440-51W1Z HSNF440-54W1Z HSNS440-36W1Z HSNS440-40W1Z HSNS440-42W1Z HSNS440-46W1Z HSNS440-51W1Z HSNS440-54W1Z HSNH440-36W1 HSNH440-40W1 HSNH440-42W1 HSNH440-46W1 HSNH440-51W1 HSNH440-54W1 HSNF440-36W1 HSNF440-40W1 HSNF440-42W1 HSNF440-46W1 HSNF440-51W1 HSNF440-54W1 HSNS440-36W1 HSNS440-40W1 HSNS440-42W1 HSNS440-46W1 HSNS440-51W1 HSNS440-54W1 HSNH440-36N HSNH440-40N HSNH440-42N HSNH440-46N HSNH440-51N HSNH440-54N HSNF440-36N HSNF440-40N HSNF440-42N HSNF440-46N HSNF440-51N HSNF440-54N HSNS440-36N HSNS440-40N HSNS440-42N HSNS440-46N HSNS440-51N HSNS440-54N HSNH440-36 HSNH440-40 HSNH440-42 HSNH440-46 HSNH440-51 HSNH440-54 HSNF440-36 HSNF440-40 HSNF440-42 HSNF440-46 HSNF440-51 HSNF440-54 HSNS440-36 HSNS440-40 HSNS440-42 HSNS440-46 HSNS440-51 HSNS440-54 HSND440-36W1 HSND440-40W1 HSND440-42W1 HSND440-46W1 HSND440-51W1 HSND440-54W1 HSND440-36N HSND440-40N HSND440-42N HSND440-46N HSND440-51N HSND440-54N HSND440-36 HSND440-40 HSND440-42 HSND440-46 HSND440-51 HSND440-54 HSNK440-36W1 HSNK440-40W1 HSNK440-42W1 HSNK440-46W1 HSNK440-51W1 HSNK440-54W1 HSNK440-36N HSNK440-40N HSNK440-42N HSNK440-46N HSNK440-51N HSNK440-54N HSNK440-36 HSNK440-40 HSNK440-42 HSNK440-46 HSNK440-51 HSNK440-54 HSNH440-36A HSNH440-40A HSNH440-42A HSNH440-46A HSNH440-51A HSNH440-54A HSNH440-36ZA HSNH440-40ZA HSNH440-42ZA HSNH440-46ZA HSNH440-51ZA HSNH440-54ZA SNH440R40U8W2 SNH440R46U8W2 SNH440R52U8W2 SNH440R54U8W2 SNF440R40U8W2 SNF440R46U8W2 SNF440R52U8W2 SNF440R54U8W2 SNS440R40U8W2 SNS440R46U8W2 SNS440R52U8W2 SNS440R54U8W2 SNH440R40U8W3 SNH440R46U8W3 SNH440R52U8W3 SNH440R54U8W3 SNF440R40U8W3 SNF440R46U8W3 SNF440R52U8W3 SNF440R54U8W3 SNS440R40U8W3 SNS440R46U8W3 SNS440R52U8W3 SNS440R54U8W3 SNH440R40U8W21 SNH440R46U8W21 SNH440R52U8W21 SNH440R54U8W21 SNF440R40U8W21 SNF440R46U8W21 SNF440R52U8W21 SNF440R54U8W21 SNS440R40U8W21 SNS440R46U8W21 SNS440R52U8W21 SNS440R54U8W21 SNH440R40U8W23 SNH440R46U8W23 SNH440R52U8W23 SNH440R54U8W23 SNF440R40U8W23 SNF440R46U8W23 SNF440R52U8W23 SNF440R54U8W23 SNS440R40U8W23 SNS440R46U8W23 SNS440R52U8W23 SNS440R54U8W23 SNH440R40U12.1W2 SNH440R46U12.1W2 SNH440R52U12.1W2 SNH440R54U12.1W2 SNF440R40U12.1W2 SNF440R46U12.1W2 SNF440R52U12.1W2 SNF440R54U12.1W2 SNS440R40U12.1W2 SNS440R46U12.1W2 SNS440R52U12.1W2 SNS440R54U12.1W2 SNH440R40U12.1W3 SNH440R46U12.1W3 SNH440R52U12.1W3 SNH440R54U12.1W3 SNF440R40U12.1W3 SNF440R46U12.1W3 SNF440R52U12.1W3 SNF440R54U12.1W3 SNS440R40U12.1W3 SNS440R46U12.1W3 SNS440R52U12.1W3 SNS440R54U12.1W3 SNH440R40U12.1W21 SNH440R46U12.1W21 SNH440R52U12.1W21 SNH440R54U12.1W21 SNF440R40U12.1W21 SNF440R46U12.1W21 SNF440R52U12.1W21 SNF440R54U12.1W21 SNS440R40U12.1W21 SNS440R46U12.1W21 SNS440R52U12.1W21 SNS440R54U12.1W21 SNH440R40U12.1W23 SNH440R46U12.1W23 SNH440R52U12.1W23 SNH440R54U12.1W23 SNF440R40U12.1W23 SNF440R46U12.1W23 SNF440R52U12.1W23 SNF440R54U12.1W23 SNS440R40U12.1W23 SNS440R46U12.1W23 SNS440R52U12.1W23 SNS440R54U12.1W23 SNH440R40E6.7W2 SNH440R46E6.7W2 SNH440R52E6.7W2 SNH440R54E6.7W2 SNF440R40E6.7W2 SNF440R46E6.7W2 SNF440R52E6.7W2 SNF440R54E6.7W2 SNS440R40E6.7W2 SNS440R46E6.7W2 SNS440R52E6.7W2 SNS440R54E6.7W2 SNH440R40E6.7W3 SNH440R46E6.7W3 SNH440R52E6.7W3 SNH440R54E6.7W3 SNF440R40E6.7W3 SNF440R46E6.7W3 SNF440R52E6.7W3 SNF440R54E6.7W3 SNS440R40E6.7W3 SNS440R46E6.7W3 SNS440R52E6.7W3 SNS440R54E6.7W3 SNH440R40E6.7W21 SNH440R46E6.7W21 SNH440R52E6.7W21 SNH440R54E6.7W21 SNF440R40E6.7W21 SNF440R46E6.7W21 SNF440R52E6.7W21 SNF440R54E6.7W21 SNS440R40E6.7W21 SNS440R46E6.7W21 SNS440R52E6.7W21 SNS440R54E6.7W21 SNH440R40E6.7W23 SNH440R46E6.7W23 SNH440R52E6.7W23 SNH440R54E6.7W23 SNF440R40E6.7W23 SNF440R46E6.7W23 SNF440R52E6.7W23 SNF440R54E6.7W23 SNS440R40E6.7W23 SNS440R46E6.7W23 SNS440R52E6.7W23 SNS440R54E6.7W23 TRSNH440-36 TRSNH440-40 TRSNH440-42 TRSNH440-46 TRSNH440-51 TRSNH440-54 TRSNF440-36 TRSNF440-40 TRSNF440-42 TRSNF440-46 TRSNF440-51 TRSNF440-54 TRSNS440-36 TRSNS440-40 TRSNS440-42 TRSNS440-46 TRSNS440-51 TRSNS440-54 TRSND440-36 TRSND440-40 TRSND440-42 TRSND440-46 TRSND440-51 TRSND440-54 TRSNK440-36 TRSNK440-40 TRSNK440-42 TRSNK440-46 TRSNK440-51 TRSNK440-54 HTSNH440-36 HTSNH440-40 HTSNH440-42 HTSNH440-46 HTSNH440-51 HTSNH440-54 HTSNF440-36 HTSNF440-40 HTSNF440-42 HTSNF440-46 HTSNF440-51 HTSNF440-54 HTSNS440-36 HTSNS440-40 HTSNS440-42 HTSNS440-46 HTSNS440-51 HTSNS440-54 HTSND440-36 HTSND440-40 HTSND440-42 HTSND440-46 HTSND440-51 HTSND440-54 HTSNK440-36 HTSNK440-40 HTSNK440-42 HTSNK440-46 HTSNK440-51 HTSNK440-54 HSNH440-36Z HSNH440-40Z HSNH440-42Z HSNH440-46Z HSNH440-51Z HSNH440-54Z HSNF440-36Z HSNF440-40Z HSNF440-42Z HSNF440-46Z HSNF440-51Z HSNF440-54Z HSNS440-36Z HSNS440-40Z HSNS440-42Z HSNS440-46Z HSNS440-51Z HSNS440-54Z HSNH440-36NZ HSNH440-40NZ HSNH440-42NZ HSNH440-46NZ HSNH440-51NZ HSNH440-54NZ HSNF440-36NZ HSNF440-40NZ HSNF440-42NZ HSNF440-46NZ HSNF440-51NZ HSNF440-54NZ HSNS440-36NZ HSNS440-40NZ HSNS440-42NZ HSNS440-46NZ HSNS440-51NZ HSNS440-54NZ HSNH440-36W1Z HSNH440-40W1Z HSNH440-42W1Z HSNH440-46W1Z HSNH440-51W1Z HSNH440-54W1Z HSNF440-36W1Z HSNF440-40W1Z HSNF440-42W1Z HSNF440-46W1Z HSNF440-51W1Z HSNF440-54W1Z HSNS440-36W1Z HSNS440-40W1Z HSNS440-42W1Z HSNS440-46W1Z HSNS440-51W1Z HSNS440-54W1Z HSNH440-36W1 HSNH440-40W1 HSNH440-42W1 HSNH440-46W1 HSNH440-51W1 HSNH440-54W1 HSNF440-36W1 HSNF440-40W1 HSNF440-42W1 HSNF440-46W1 HSNF440-51W1 HSNF440-54W1 HSNS440-36W1 HSNS440-40W1 HSNS440-42W1 HSNS440-46W1 HSNS440-51W1 HSNS440-54W1 HSNH440-36N HSNH440-40N HSNH440-42N HSNH440-46N HSNH440-51N HSNH440-54N HSNF440-36N HSNF440-40N HSNF440-42N HSNF440-46N HSNF440-51N HSNF440-54N HSNS440-36N HSNS440-40N HSNS440-42N HSNS440-46N HSNS440-51N HSNS440-54N HSNH440-36 HSNH440-40 HSNH440-42 HSNH440-46 HSNH440-51 HSNH440-54 HSNF440-36 HSNF440-40 HSNF440-42 HSNF440-46 HSNF440-51 HSNF440-54 HSNS440-36 HSNS440-40 HSNS440-42 HSNS440-46 HSNS440-51 HSNS440-54 HSND440-36W1 HSND440-40W1 HSND440-42W1 HSND440-46W1 HSND440-51W1 HSND440-54W1 HSND440-36N HSND440-40N HSND440-42N HSND440-46N HSND440-51N HSND440-54N HSND440-36 HSND440-40 HSND440-42 HSND440-46 HSND440-51 HSND440-54 HSNK440-36W1 HSNK440-40W1 HSNK440-42W1 HSNK440-46W1 HSNK440-51W1 HSNK440-54W1 HSNK440-36N HSNK440-40N HSNK440-42N HSNK440-46N HSNK440-51N HSNK440-54N HSNK440-36 HSNK440-40 HSNK440-42 HSNK440-46 HSNK440-51 HSNK440-54 HSNH440-36A HSNH440-40A HSNH440-42A HSNH440-46A HSNH440-51A HSNH440-54A HSNH440-36ZA HSNH440-40ZA HSNH440-42ZA HSNH440-46ZA HSNH440-51ZA HSNH440-54ZA HSNS440-42三螺桿泵 冷卻油泵裝置 HSNS三螺桿泵 煉鋼連鑄機(jī)液壓系統(tǒng)三螺桿油泵裝置螺桿泵的維修螺桿泵的維修是一個(gè)非常復(fù)雜的過(guò)程，因?yàn)槁輻U泵的轉(zhuǎn)子和定子的相互之間的摩擦?xí)a(chǎn)生熱，容易損壞定子。。也有很多種情況導(dǎo)致螺桿泵的損壞，下面是具體的情況 1.螺桿泵不能啟動(dòng)，一旦遇到這種情況，我們要先檢查一下，如果是新泵，在試車的時(shí)候，先盤車，看是否定子和轉(zhuǎn)子很緊，這個(gè)情況一般沒(méi)關(guān)系的，在檢查一下是否電壓過(guò)低導(dǎo)致電機(jī)帶不動(dòng)螺桿泵 2.螺桿泵沒(méi)有出料，這個(gè)情況就比較復(fù)雜了，所以我們要檢查電機(jī)接線是否正確，旋轉(zhuǎn)方向是否有誤，有些型號(hào)的螺桿泵是不能反向旋轉(zhuǎn)的，然后在檢查是否進(jìn)口管路的問(wèn)題，是否有堵塞或者進(jìn)口有泄露，檢查并且調(diào)整，如果物料的粘度過(guò)高，也會(huì)導(dǎo)致吸不上來(lái)，加大泵的型號(hào)，或者放慢轉(zhuǎn)速，如果這些地方都沒(méi)有問(wèn)題，請(qǐng)檢查定子和轉(zhuǎn)子之間的間隙，是否有磨損，如果很大，需要及時(shí)更換定子，或者檢查是否有異物堵塞定子和轉(zhuǎn)子了，，及時(shí)清除就可以排除了問(wèn)題 3.螺桿泵流量達(dá)不到， 這個(gè)情況是很多客戶使用螺桿泵出現(xiàn)的問(wèn)題，一般有如下情況轉(zhuǎn)子和定子有磨損，導(dǎo)致流量減少，內(nèi)泄漏增加，或者說(shuō)出口閥門沒(méi)有打開，還有就是出口管道的局部堵塞導(dǎo)致的 4.電機(jī)過(guò)熱，首先檢查是否電機(jī)的電壓，電流，頻率，然后在檢查是否出口壓力過(guò)高，導(dǎo)致電機(jī)過(guò)載，也有可能是定子燒壞了，粘在轉(zhuǎn)子上 5.流量和壓力急劇下降，這個(gè)一般是由于突然的定子被燒壞，導(dǎo)致磨損嚴(yán)重，流量和壓力下降 6.螺桿泵的機(jī)械密封有大量液體漏出來(lái)，請(qǐng)及時(shí)更換機(jī)械密封或者換填料密封 HSNS440-42三螺桿泵十個(gè)優(yōu)點(diǎn) HSNS三螺桿泵優(yōu)點(diǎn)： 1.HSNS三螺桿循環(huán)油泵壓力和流量范圍寬闊。 流量范圍0.2～600m3/hzui高工作壓力可達(dá)6.3MPa。 2.HSNS三螺桿泵組輸送液體的種類和粘度范圍寬廣； 3.因?yàn)镠SNS三螺桿泵內(nèi)的回轉(zhuǎn)部件慣性力較低，故可使用很高的轉(zhuǎn)速； 4.HSNS液壓油泵具有很好的吸入性和自吸能力； 5.HSNS潤(rùn)滑油泵具有流量均勻連續(xù)，振動(dòng)小，噪音低等特點(diǎn)； 6HSNS三螺桿泵與其它回轉(zhuǎn)泵相比，對(duì)進(jìn)入的氣體和污物不太敏感； 7.HSNS三螺桿泵結(jié)構(gòu)堅(jiān)實(shí)，安裝保養(yǎng)容易。 8.HSN三螺桿泵，自吸。 9.HSNS由于部件通用組合系列化有多種結(jié)構(gòu)，可用于臥式，法蘭式和立式安裝。 10.根據(jù)HSNS三螺桿泵所輸送介質(zhì)需要還可提供加熱或冷卻結(jié)構(gòu)。 HSNS440-42三螺桿泵設(shè)計(jì)原理 HSNS三螺桿泵是按國(guó)家標(biāo)準(zhǔn)GB10887-89設(shè)計(jì)、制造生產(chǎn)。HSNS三螺桿泵是轉(zhuǎn)子式容積泵，它是利用螺桿嚙合原理，依靠旋轉(zhuǎn)的螺桿在泵套內(nèi)相互嚙合，把被輸送的介質(zhì)封閉在嚙合腔內(nèi)，沿螺桿軸向連續(xù)勻速地推至排出口，為系統(tǒng)提供穩(wěn)定的壓力。三螺桿泵適用于輸送各種無(wú)腐蝕性油類及類似油和潤(rùn)滑性液體。輸送液體的粘度范圍一般為3.0～760mm2/S(1.2～100°E)，高粘度介質(zhì)可通過(guò)加溫降粘后輸送。其溫度一般不超過(guò)350℃。 HSNS440-42三螺桿泵結(jié)構(gòu)特點(diǎn) HSN系列三螺桿泵由特殊型線構(gòu)成的螺旋面的主動(dòng)螺桿轉(zhuǎn)動(dòng)時(shí)，其動(dòng)密封腔室將把液體由吸入口吸入并沿軸向連續(xù)、無(wú)脈動(dòng)的輸送到排出口。主桿采用液壓平衡，從桿的軸向力支撐在后蓋上，并由液壓力驅(qū)動(dòng)旋轉(zhuǎn)，因而螺桿型面僅傳遞液壓扭矩，并不受力，也無(wú)磨損，對(duì)全部傳動(dòng)零件而言，均由被輸送介質(zhì)潤(rùn)滑。主桿的徑向由平衡活塞定位，且借助于平衡活塞和軸套的間隙使高壓腔和密封腔分開，在密封腔內(nèi)裝有機(jī)械密封，腔內(nèi)的油液回油孔與泵的吸入腔相通，因而不受排出壓力的影響。由于部件通用組合系列化有多種結(jié)構(gòu)，可用于臥式（H），法蘭式（F）和立式（S）安裝。 根據(jù)所輸送介質(zhì)需要還可提供加熱或冷卻結(jié)構(gòu)。 HSNS440-42三螺桿泵應(yīng)用范圍 在供熱設(shè)備中用做燃油噴油，燃油供應(yīng)和輸送泵。 在機(jī)械工業(yè)中用做液壓，潤(rùn)滑和遙控馬達(dá)泵。 在化學(xué)石油化工和食品工業(yè)中用做裝載，輸送和供液泵。 在船舶上用做輸送、增壓、燃油噴射和潤(rùn)滑油泵以及船用液壓裝置泵。