?Z2FS?6?A5-4X/2QV

武穴黎翔機(jī)電設(shè)備有限公司，詢價聯(lián)系人：何女士

詢價電話：0713-6542758，手機(jī)：18934630908????

詢價傳真：0713-6542758

詢價QQ:?736567721,704552157

現(xiàn)貨特價型號：R900925687?4WRAE10W1-30-22/G24N9K31/F1V??2臺

0811402141?DBETBEX-1X/315G24K31F1M?????2臺

雙作用葉片泵的工作原理如圖2-10所示,泵也是由定子1、轉(zhuǎn)子2、葉片3和配油盤(圖中未畫出)等組成。轉(zhuǎn)子和定子中心重合,定子內(nèi)表面近似為橢圓柱形,該橢圓形由兩段長半徑R、兩段短半徑r和四段過渡曲線所組成。當(dāng)轉(zhuǎn)子轉(zhuǎn)動時,葉片在離心力和(建壓后)根部壓力油的作用下,在轉(zhuǎn)子槽內(nèi)作徑向移動而壓向定子內(nèi)表?

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?,由葉片、定子的內(nèi)表面、轉(zhuǎn)子的外表面和兩側(cè)配油盤間形成若干個密封空間,當(dāng)轉(zhuǎn)子按圖示方向旋轉(zhuǎn)時,處在??小圓弧上的密封空間經(jīng)過渡曲線而運(yùn)動到大圓弧的過程中,葉片外伸,密封空間的容積增大,要吸入油液;再從大圓弧經(jīng)過渡曲線運(yùn)動到小圓弧的過程中,葉片被定子內(nèi)壁逐漸壓進(jìn)槽內(nèi),密封空間容積變小,將油液從壓

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??油口壓出,因而,當(dāng)轉(zhuǎn)子每轉(zhuǎn)一周,每個工作空間要完成兩次吸油和壓油,所以稱之為雙作用葉片泵,這種葉片泵由于有兩個吸油腔和兩個壓油腔,并且各自的中心夾角是對稱的,所以作用在轉(zhuǎn)子上的油液壓力相互平衡,因此雙作用葉片泵又稱為卸荷式葉片泵,為了要使徑向力完全平衡,密封空間數(shù)(即葉片數(shù))應(yīng)當(dāng)是雙數(shù)。

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?2.雙作用葉片泵的排量和流量計(jì)算??雙作用葉片泵如不考慮葉片厚度,泵的輸出流量是均勻的,但實(shí)際葉片是有厚度的,長半徑圓弧和短半徑圓弧也不可能完全同心,尤其是葉片底部槽與壓油腔相通,因此泵的輸出流量將出現(xiàn)微小的脈動

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,但其脈動率較其他形式的泵(螺桿泵除外)小得多,且在葉片數(shù)為4的整數(shù)倍時最小,為此，雙作用葉片泵的葉片數(shù)一般為12或16片。?3.?葉片泵的優(yōu)缺點(diǎn)及其應(yīng)用?主要優(yōu)點(diǎn)：??(1)輸出流量比齒輪泵均勻，運(yùn)轉(zhuǎn)平穩(wěn)，噪聲小。?

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(2)工作壓力較高，容積效率也較高。??(3)單作用式葉片泵易于實(shí)現(xiàn)流量調(diào)節(jié)，雙作用式葉片泵則因轉(zhuǎn)子所受徑向液壓力平衡，使用壽命長。?

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?(4)結(jié)構(gòu)緊湊，輪廓尺寸小而流量較大。?主要缺點(diǎn)：??(1)自吸性能較齒輪泵差，對吸油條件要求較嚴(yán)，其轉(zhuǎn)速范圍必須在500~?1500?r/min范圍內(nèi)。??(2)對油液污染較敏感，葉片容易被油液中雜質(zhì)咬死，工作可靠性較差。?(3)結(jié)構(gòu)較復(fù)雜，零件制造精度要求較高，價格較高。??葉片泵一般

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用在中壓(6.3?MPa)液壓系

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