Shanghai Wei-Mi Techonology Co., LTD
主營:REXROTH電磁閥,ATOS比例閥,PARKER柱塞泵,DUPLOMATIC齒輪泵,VICKERS葉片泵,BENTLY傳感器,AIRTEC機械閥,AVENTICS氣動閥
力士樂柱塞泵A10VG45EP4D1/10R-NSC10F003SP-S
臥式柱塞泵是由幾個柱塞(一般為3個或6個)并列安裝,用1根曲軸通過連桿滑塊或由偏心軸直接推動柱塞做往復(fù)運動,實現(xiàn)吸、排液體的液壓泵。它們也都采用閥式配流裝置,而且大多為定量泵。煤礦液壓支架系統(tǒng)中的乳化液泵一般都是臥式柱塞泵。
乳化液泵用于采煤工作面,為液壓支架提供乳化液,工作原理靠曲軸的旋轉(zhuǎn)帶動活塞做往復(fù)運動,實現(xiàn)吸液和排液。
軸向柱塞泵(英文名:Piston pump)是活塞或柱塞的往復(fù)運動方向與缸體中心軸平行的柱塞泵。軸向柱塞泵利用與傳動軸平行的柱塞在柱塞孔內(nèi)往復(fù)運動所產(chǎn)生的容積變化來進(jìn)行工作的。由于柱塞和柱塞孔都是圓形零件,加工時可以達(dá)到很高的精度配合,因此容積效率高
泵的主要性能參數(shù)
1、壓力
關(guān)于壓力,經(jīng)常提到的有下面三個概念:
A、工作壓力:液壓泵實際工作時的輸出壓力稱為工作壓力。工作壓力取決于液壓系統(tǒng)的外負(fù)載的大小和排油管路上的壓力損失,而與液壓泵的流量無關(guān)。
B、額定壓力:液壓泵在正常工作條件下,按試驗標(biāo)準(zhǔn)規(guī)定連續(xù)運轉(zhuǎn)的較高壓力,通常,工作壓力不得超過額定壓力。一般額定壓力會在銘牌上標(biāo)出。
C、較高允許壓力:在超過額定壓力的條件下,根據(jù)試驗準(zhǔn)規(guī)定,允許液壓泵短暫運行的較高壓力值。超過此壓力,泵的泄露會迅速增加。額定壓力不得超過較高允許壓力,一旦超過,泵就會出現(xiàn)泄漏。
2、排量和流量
汽車往往有1.6排量,2.0排量,這實際上就是發(fā)動機旋轉(zhuǎn)一圈所消耗的汽油體積,這跟液壓泵的排量概念是非常類似的。
(1)排量,指在無泄漏的情況下,液壓泵轉(zhuǎn)一圈所能排出的油液體積,這是一個和液壓泵的機械結(jié)構(gòu)有關(guān)的參數(shù),其大小只與液壓泵中密封工作容腔的幾何尺寸和個數(shù)有關(guān)。從機械結(jié)構(gòu)來講,有些排量是不變的,即定量泵,有些排量是可變的,即變量泵。
注:一般定量泵因密封性較好,泄露少,在高壓時效率較高。
(2)流量為泵單位時間內(nèi)排出的液體體積(L/min),有理論流量Qth、實際流量Qac、額定流量Qn。
A、理論流量指不考慮泄露的情況下得到的流量值,所以Qth=qn,式中,q為泵的排量(L/r),n為泵的轉(zhuǎn)速(r/min)。
B、實際流量是考慮了這部分泄露,Qac=Qth-△Q,式中,△Q表示泵的泄露損失,泵運轉(zhuǎn)時油會從高壓區(qū)泄露到低壓區(qū)
C、額定流量Qn(L/min)指液壓泵在正常工作條件下,按試驗標(biāo)準(zhǔn)規(guī)定(如在額定壓力和額定轉(zhuǎn)速下)必須保證的流量。通常會在銘牌上標(biāo)識。理論來說,輸出流量會略低于額定流量值。
力士樂油泵供應(yīng)型號
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電液比例閥是采用了比例控制技術(shù),介于開關(guān)型液壓閥和電液伺服閥之間的-種液壓元件,在工業(yè)生產(chǎn)中獲得了廣泛的應(yīng)用,輸入的電信號有模擬式和數(shù)字式兩大類,可以用于控制位置(轉(zhuǎn)角)、速度(轉(zhuǎn)速)、加速度(角加速度)、壓力(壓差)、力(力矩)等參數(shù)。電液比例閥等元件可以組成如下三類控制回路和系統(tǒng)
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