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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,，價格較貴,。
 力士樂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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 1）軸向柱塞泵,。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。原動機(jī)通過傳動軸帶動缸體旋轉(zhuǎn),，柱塞就在柱塞孔內(nèi)作軸向往復(fù)滑動,。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?？煞譃椋?/p>

一,、徑向柱塞泵
　　徑向柱塞泵是將柱塞徑向排列在缸體內(nèi)，缸體由原動機(jī)帶動連同柱塞一起轉(zhuǎn)動,，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柱塞軸向配置在一個共同缸體的圓周上,，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)原動機(jī)通過傳動軸使缸體轉(zhuǎn)動時，由于斜盤的作用,，迫使柱塞在缸體內(nèi)作往復(fù)運(yùn)動,，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,，價格貴，使用環(huán)境要求高,。
（4） 柱塞數(shù)通常為7,、9、11個,，單數(shù),，減小脈動。
（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改變?nèi)莘e來實(shí)現(xiàn)吸油和排油的,，尾部有兩個單向閥，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,，供油開始是時刻不隨供油行業(yè)的變化而變化，轉(zhuǎn)動柱塞可以改變供油終了時刻,，從而改變供油量,。在柱塞泵工作時，在凸輪和柱塞彈簧的作用下,，迫使柱塞上下往復(fù)運(yùn)動,，從而完成柱塞泵的三個工作過程，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,，柱塞會向下運(yùn)動，這時柱塞的上部空間產(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)動到下卡點(diǎn)時,，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,，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,，燃油受壓,，這時會有一部分燃油經(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,，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密封的油腔，這時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，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,，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。這時又開始了下一個循環(huán),。