REXROTH力士樂柱塞泵現(xiàn)貨供應(yīng)

德國REXROTH力士樂柱塞泵依靠柱塞與缸體內(nèi)孔面來形成密封工作容積的,。由于柱塞與缸體內(nèi)孔均為圓柱表面，因此加工方便,，配合精度高,，密封性能好,。故柱塞泵常做成高壓泵。
 優(yōu)點(diǎn)：壓力高,、結(jié)構(gòu)緊湊,、效率高及流量調(diào)節(jié)方便。
 缺點(diǎn)：結(jié)構(gòu)復(fù)雜,，價(jià)格較貴,。
 柱塞泵按柱塞排列方向的不同，分為軸向柱塞泵和徑向柱塞泵,。在此,，簡要介紹軸向柱塞泵和回轉(zhuǎn)式徑向柱塞泵。
 – 斜軸結(jié)構(gòu)軸向柱塞變量泵,，用于開式回路的液壓傳動(dòng)系統(tǒng),。
 　　– 適用于工程機(jī)械或工業(yè)領(lǐng)域。
 　　– 多種變量方式適用于各種控制和調(diào)節(jié)過程,。
 　　– 堅(jiān)固的驅(qū)動(dòng)軸圓錐滾子軸承使泵結(jié)構(gòu)緊湊,，壽命長,。
 　　– 輸出流量與轉(zhuǎn)速和排量成正比，排量從Vg max至Vg min＝0無級可調(diào),。

REXROTH力士樂柱塞泵現(xiàn)貨供應(yīng)

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：唐玙昺

：   

上海穎哲工業(yè)自動(dòng)化設(shè)備有限公司
上海市黃浦區(qū)北京東路668號上?？萍季┏菛|樓20C2

 1）軸向柱塞泵。圖6-13所示為斜盤式軸向柱塞泵的工作原理圖,，軸向柱塞泵由配流盤,、缸體（轉(zhuǎn)子）、柱塞和斜盤等主要零件組成,。在配流盤上開有兩個(gè)弧形 溝槽,，分別與泵的吸、壓油口連通,，形成吸油腔和壓油腔,。斜盤、配流盤均與泵體相固定,，柱塞在彈簧的作用下以球形端頭與斜盤接觸,。兩個(gè)弧形溝槽彼此隔開，保 持一定的密封性,。斜盤相對于缸體的夾角為γ,。原動(dòng)機(jī)通過傳動(dòng)軸帶動(dòng)缸體旋轉(zhuǎn)，柱塞就在柱塞孔內(nèi)作軸向往復(fù)滑動(dòng),。處于π～2π范圍內(nèi)的柱塞向外伸出,，使其底 部的密封容積增大，將油吸入,；處于0～π范圍內(nèi)的柱塞向缸體內(nèi)壓入,，使其底部的密封容積減小，把油壓往系統(tǒng)中,。
柱塞泵有軸向柱塞泵和徑向柱塞泵,。可分為：

一,、徑向柱塞泵
　　徑向柱塞泵是將柱塞徑向排列在缸體內(nèi),，缸體由原動(dòng)機(jī)帶動(dòng)連同柱塞一起轉(zhuǎn)動(dòng)，周期性改變密閉容積的大小,，達(dá)到吸,、排油的目的。

二,、軸向柱塞泵

1.結(jié)構(gòu)和原理
　　　軸向柱塞泵是將多個(gè)柱塞軸向配置在一個(gè)共同缸體的圓周上,，并使柱塞中心線和缸體中心線平行的一種泵，軸向柱塞泵有兩種形式,，直軸式（斜盤式）和斜軸式（擺缸式）,，所示的為直軸式軸向柱塞泵的工作原理,，這種泵主要由缸體1、配油盤2,、柱塞3和斜盤4組成,。柱塞沿圓周均勻分布在缸體內(nèi)。斜盤與缸體軸線傾斜一角度γ,，柱塞靠機(jī)械裝置或低壓油作用下壓緊在斜盤上（圖中為彈簧）,，配油盤2和斜盤4固定不轉(zhuǎn)，當(dāng)原動(dòng)機(jī)通過傳動(dòng)軸使缸體轉(zhuǎn)動(dòng)時(shí),，由于斜盤的作用,，迫使柱塞在缸體內(nèi)作往復(fù)運(yùn)動(dòng)，并通過配油盤的配油窗口進(jìn)行吸油和壓油,?；剞D(zhuǎn)方向，當(dāng)缸體轉(zhuǎn)角在π～2π范圍內(nèi),，柱塞向外伸出,，柱塞底部的密封工作容積增大，通過配油盤的吸油窗口吸油,；在0～π范圍內(nèi),，柱塞被斜盤推入缸體，使密封容積減小,，通過配油盤的壓油窗口壓油,。缸體每轉(zhuǎn)一周，每個(gè)柱塞各完成吸,、壓油一次,，如改變斜盤傾角γ,，可改變液壓泵的排量,，改變斜盤傾角方向，就能改變吸油和壓油的方向,，成為雙向變量泵,。

2.排量和流量計(jì)算：
D：分布圓直徑 d:柱塞直徑 z:柱塞數(shù)
柱塞泵-高壓泵，對元件的精度要求高,，制造成本高

3.柱塞泵特點(diǎn)：
（1） 柱塞和缸體配合間隙容易控制,，密封性好，容積斜率高0.93-0.95,。
（2） 采用滑履與回程盤裝置,，避免球頭的頭接觸。
（3） 高壓泵,，結(jié)構(gòu)復(fù)雜,，價(jià)格貴,，使用環(huán)境要求高。
（4） 柱塞數(shù)通常為7,、9,、11個(gè)，單數(shù),，減小脈動(dòng),。
（5） 排量取決于泵的斜盤傾角γ。
柱塞泵是利用柱塞和柱塞套的相對滑動(dòng)改變?nèi)莘e來實(shí)現(xiàn)吸油和排油的,，尾部有兩個(gè)單向閥,，塞和套之間靠間隙和油的粘度來密封。
 
柱塞泵工作原理:柱塞泵往復(fù)運(yùn)動(dòng)的總行程L是由凸輪的升級所決定的,，所以總行程是不變的,。柱塞每一次循環(huán)的供油量的大小取決于供油行程，供油行程是可變的,，供油開始是時(shí)刻不隨供油行業(yè)的變化而變化,，轉(zhuǎn)動(dòng)柱塞可以改變供油終了時(shí)刻，從而改變供油量,。在柱塞泵工作時(shí),，在凸輪和柱塞彈簧的作用下，迫使柱塞上下往復(fù)運(yùn)動(dòng),，從而完成柱塞泵的三個(gè)工作過程,，即：進(jìn)油過程、供油過程,、回油過程,。

進(jìn)油過程：當(dāng)凸輪的凸起部分轉(zhuǎn)過去以后，在柱塞彈簧的作用力下,，柱塞會(huì)向下運(yùn)動(dòng),，這時(shí)柱塞的上部空間產(chǎn)生真空度，當(dāng)柱塞上端面把柱塞套上的進(jìn)油孔打開以后,，充滿在柱塞泵上體油道內(nèi)的液體經(jīng)進(jìn)油孔進(jìn)入柱塞上部空間,，（上部真空空間也叫泵油室），當(dāng)柱塞運(yùn)動(dòng)到下卡點(diǎn)時(shí),，進(jìn)油過程結(jié)束,。

供油過程：當(dāng)凸輪軸轉(zhuǎn)到凸輪的凸起部分時(shí)，凸輪體被頂起,，柱塞彈簧被壓縮,，柱塞受彈簧的反作用力后向上運(yùn)動(dòng)，燃油受壓,，這時(shí)會(huì)有一部分燃油經(jīng)油孔流回噴油泵上體油腔,。當(dāng)柱塞頂面遮住套筒上的進(jìn)油孔上緣時(shí),，由于柱塞和套筒之間的配合間隙很小很小，（在0.0015到0.0025mm之間）使柱塞頂部的柱塞泵油室成為一個(gè)密封的油腔,，這時(shí)柱塞在彈簧的作用力下繼續(xù)上升,，柱塞泵油室內(nèi)的油壓迅速升高，當(dāng)柱塞泵油壓力大于出油閥彈簧力和高壓油管剩余壓力時(shí),，出油閥被推開,，高壓油經(jīng)過出油閥進(jìn)入高壓油管，然后通過噴油器噴入燃燒室,。供油過程結(jié)束,。

回油過程：當(dāng)柱塞向上供油上升到柱塞的斜槽與套筒上的回油孔相通時(shí)，柱塞泵油室低壓油路便和柱塞頭部的中孔和徑向孔及斜槽溝通,，油壓突然下降,，這時(shí)出油閥在彈簧力的作用下迅速關(guān)閉，回油過程結(jié)束,。然后柱塞還要上行,，當(dāng)凸輪的凸起部分轉(zhuǎn)過去以后，在柱塞彈簧的作用力下柱塞再次下行,。這時(shí)又開始了下一個(gè)循環(huán),。