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派克柱塞泵
工作原理:圖中柱塞2裝在缸體3中形成一個(gè)密封容積a,柱塞在彈簧4的作用下始終壓緊在偏心輪1上。原動(dòng)機(jī)驅(qū)動(dòng)偏心
輪1旋轉(zhuǎn)使柱塞2作往復(fù)運(yùn)動(dòng),使密封容積a的大小發(fā)生周期性的交替變化。當(dāng)a由小變大時(shí)就形成部分真空,使油箱中油
液在大氣壓作用下, 經(jīng)過吸油管頂開吸油單向閥6進(jìn)入a腔而實(shí)現(xiàn)吸油:反之,當(dāng)a由大變小時(shí),油液擠壓,壓力增大,a
腔中的油液將頂開排油單向閥5流人系統(tǒng)而實(shí)現(xiàn)排油。這樣派克柱塞泵就將原動(dòng)機(jī)輸人的機(jī)械能轉(zhuǎn)換成液體的壓力能,
原動(dòng)機(jī)驅(qū)動(dòng)偏心輪不斷旋轉(zhuǎn),派克柱塞泵就不斷地吸油和排油,
從派克柱塞泵的工作原理可看出,容積式派克柱塞泵基本的工作條件如下
(1)必須有密封容積存在,同時(shí)密封容積大小不斷發(fā)生變化,以此完成吸油和排油過程
(2)要有配油機(jī)構(gòu),通過配油機(jī)構(gòu)將吸液腔和排液腔隔開,保證派克柱塞泵有規(guī)律地連續(xù)吸排油
(3)油箱內(nèi)液體的絕對(duì)壓力必須等于或大于大氣壓力,這是容積式派克柱塞泵能夠吸人油液的外部條件
派克柱塞泵的分類方法很多,其各種分類方法如下
按工作機(jī)構(gòu)的結(jié)構(gòu)分為腿泵〔外嚙合式、內(nèi)嚙合式)、葉片泵(單作用式、雙作用式)、柱塞泵(軸向式,徑向式)和螺
桿泵(雙螺桿式、三螺桿式)
按泵的每轉(zhuǎn)排量是否能調(diào)節(jié)分為定量泵和變量泵。
按泵的排油方向分為單向泵和雙向泵
按泵的工作壓力分為低壓泵(壓力小于2.5Mpa)、中壓泵(壓力為2.5Mpa~8Mpa)、中髙壓泵(壓力為8 Mpa~16Mpa)
高壓泵(壓力為16Mpa~32Mpa)和超髙壓泵(壓力大于32Mpa)
各種派克柱塞泵都可以制造成定量泵,如齒輪泵(外嚙合式、內(nèi)嚙合式)、葉片泵(單作用式、雙作用式)、柱塞泵〔
軸向式、徑向式)和螺捍泵(雙螺桿式、三螺桿式);有的派克柱塞泵能制造成變量泵,如單作用葉片泵、軸向柱塞泵
和徑向柱塞泵。
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