行業(yè)動態(tài)

90R055DD齒輪泵的分類與優(yōu)缺點

2022-11-17 閱讀次數(shù):

徑向不平衡力的產(chǎn)生:液壓力 液體分布規(guī)律:從高壓腔到低壓腔,沿齒輪外的壓力逐齒降低p↑,徑向不平衡力增大齒輪和軸承受到很大的沖擊載荷,產(chǎn)生振動和噪聲 改善措施:縮小壓油口,以減小壓力油作用面積增加泵體內(nèi)表面與齒頂間隙之間的壓力平衡槽將降低體積效率 總之:泵壓力愈高,泄漏愈大。

90R055DD齒輪泵的分類與優(yōu)缺點(圖1)

提高齒輪泵壓力的方法: 浮動軸套補償原理:將壓力油引入軸套背面,使其靠近齒輪端面,補償磨損,減少間隙 彈性側(cè)板補償原理:通過側(cè)板本身的變形,將泵出口壓力油引至側(cè)板背面,以補償端面間隙 外嚙合齒輪泵的優(yōu)點 1.結(jié)構(gòu)簡單,制造方便,價格低廉 2.結(jié)構(gòu)緊湊,體積小,重量輕 3.自吸性能好,對油污不敏感 4.工作可靠,便于維護 外嚙合齒輪泵的缺點 1.流量脈動大 2.噪聲大 3.排量不可調(diào) 嚙合齒輪泵由小齒輪、內(nèi)齒環(huán)、月牙隔板等組成 工作原理:小齒輪帶動內(nèi)齒環(huán)同向異速旋轉(zhuǎn),左半部分輪齒退出嚙合,形成真空吸油。

右半部分輪齒退出嚙合,容積減小,壓油月牙板同兩齒輪將吸壓油口隔開 擺線齒形內(nèi)嚙合齒輪泵由內(nèi)外轉(zhuǎn)子相差一齒組成,有偏心距離 工作原理:吸油—左半部分,輪齒脫開嚙合容積↑,壓油—右半部分,輪齒進入嚙合容積↓ 特點:結(jié)構(gòu)緊湊,尺寸小,重量輕,運轉(zhuǎn)平穩(wěn),噪聲小流量脈動小。

但齒形復雜,加工困難,價格昂貴 螺桿泵組成 一根主動螺桿——雙頭、右旋、凸螺桿 兩個從動螺桿-雙頭,左旋,凹螺桿,安裝在泵體內(nèi),與其他部件形成螺桿泵 螺桿泵工作原理:V密形成,V密變化,吸壓油口隔開 V密形成必須滿足四個密封條件,才能形成空間八字形密封容積: 1主從動螺桿共扼 2螺桿根數(shù)和螺紋頭數(shù)必須滿足一定關(guān)系 3泵體最小長度應大于螺桿的導程 4保證最小徑向間隙 V密變化:當主動螺桿逆時針方向旋轉(zhuǎn)時:左面吸油,右面壓油 吸壓油口隔開:滿足上述四個密封條件 特點:結(jié)構(gòu)簡單,體積小,重量輕,運行穩(wěn)定、噪音低、使用壽命長、流量均勻、自吸能力強、體積效率高、無油現(xiàn)象;但螺桿齒形復雜,加工難度大,精度難以保證。

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90-L-075-HF-5-NN-80-S-3-C7-D-03-GBA-42-42-24 90L075HF5NN80S3C7D03GBA424224 90L075-HF-5-NN-80-S-4-C6-E-03-GBA-42-42-24 90L075HF5NN80S4C6E03GBA424224 90-L-075-HF-5-NN-80-S-4-C6-E-03-GBA-42-42-24 90L075HF5NN80S4C6E03GBA424224。

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