REXROTH力士樂(lè)柱塞泵現(xiàn)貨供應(yīng) 德國(guó)REXROTH力士樂(lè)柱塞泵依靠柱塞與缸體內(nèi)孔面來(lái)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。 力士樂(lè)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(jiǎn)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(kāi)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(guò)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(zhǎng)。 – 輸出流量與轉(zhuǎn)速和排量成正比,排量從Vg max至Vg min=0無(wú)級(jí)可調(diào)。 REXROTH力士樂(lè)柱塞泵現(xiàn)貨供應(yīng) A10VSO71DFR1/32R-VPB22U99S2184 減速機(jī)A10VSO100DR/31R-PPA12N00 A10VSO71DFR1/32R-VPB22U99S2184 A10VS0100DFR1/32R-VPB12N00 A4VG56EP2DM1/32RNZC02F003DH A4VG56EP2DM1/32RNZC02F003DH A10VS071DFR1/32R-VPB22U99 A10VSO45DFR1/32R-PPB12N00 A10VSO45DFR1/32R-PPB12N00 A10VSO140DRS/32R-VPB22U99 A10VSO71DRS/32R-VPB22U99-S2184 A10VS0140DRS/32R-PPB22U99 A10VS071DFR1/32R-VPB22U99S2184 A10VSO100DFR1/32R-VPB12N00 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1)軸向柱塞泵。軸向柱塞泵由配流盤(pán)、缸體(轉(zhuǎn)子)、柱塞和斜盤(pán)等主要零件組成。在配流盤(pán)上開(kāi)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(pán)、配流盤(pán)均與泵體相固定,柱塞在彈簧的作用下以球形端頭與斜盤(pán)接觸。兩個(gè)弧形溝槽彼此隔開(kāi),保 持一定的密封性。斜盤(pán)相對(duì)于缸體的夾角為γ。原動(dòng)機(jī)通過(guò)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??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(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(pán)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(pán)2、柱塞3和斜盤(pán)4組成。柱塞沿圓周均勻分布在缸體內(nèi)。斜盤(pán)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(pán)上(圖中為彈簧),配油盤(pán)2和斜盤(pán)4固定不轉(zhuǎn),當(dāng)原動(dòng)機(jī)通過(guò)傳動(dòng)軸使缸體轉(zhuǎn)動(dòng)時(shí),由于斜盤(pán)的作用,迫使柱塞在缸體內(nèi)作往復(fù)運(yùn)動(dòng),并通過(guò)配油盤(pán)的配油窗口進(jìn)行吸油和壓油。回轉(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(guò)配油盤(pán)的吸油窗口吸油;在0~π范圍內(nèi),柱塞被斜盤(pán)推入缸體,使密封容積減小,通過(guò)配油盤(pán)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(pán)傾角γ,可改變液壓泵的排量,改變斜盤(pán)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(duì)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(pán)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(pán)傾角γ。 柱塞泵是利用柱塞和柱塞套的相對(duì)滑動(dòng)改變?nèi)莘e來(lái)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(lái)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(jí)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(kāi)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(guò)程,即:進(jìn)油過(guò)程、供油過(guò)程、回油過(guò)程。 進(jìn)油過(guò)程:當(dāng)凸輪的凸起部分轉(zhuǎn)過(guò)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(kāi)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(guò)程結(jié)束。 供油過(guò)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(kāi),高壓油經(jīng)過(guò)出油閥進(jìn)入高壓油管,然后通過(guò)噴油器噴入燃燒室。供油過(guò)程結(jié)束。 回油過(guò)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(guò)程結(jié)束。然后柱塞還要上行,當(dāng)凸輪的凸起部分轉(zhuǎn)過(guò)去以后,在柱塞彈簧的作用力下柱塞再次下行。這時(shí)又開(kāi)始了下一個(gè)循環(huán)。 |