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    您當(dāng)前的位置:首頁 > 公司動(dòng)態(tài) > REXROTH液壓泵型號(hào):4WE10D33/CG24N9K4

    REXROTH液壓泵型號(hào):4WE10D33/CG24N9K4

    發(fā)布時(shí)間: 2010-09-14  點(diǎn)擊次數(shù): 2854次

    REXROTH液壓泵型號(hào):4WE10D33/CG24N9K4
    REXROTH液壓泵的工作原理圖。柱塞2依靠彈簧4壓在偏心輪1上,偏心輪轉(zhuǎn)動(dòng)時(shí),柱塞便作往復(fù)運(yùn)動(dòng)。柱塞向右移動(dòng)時(shí),密封腔因容積增大而形成一定真空,在大氣壓力作用下通過單向閥5從油箱吸進(jìn)油液,這時(shí)單向閥6封閉壓油口防止系統(tǒng)油液回流;柱塞向左移動(dòng)時(shí),密封腔4容積減小,將已吸入的油液通過單向閥6壓出,這時(shí)單向閥5封閉吸油口防止油液流回油箱。偏心輪不停地轉(zhuǎn)動(dòng),泵就不斷地吸油和壓油。由此可見液壓泵是靠密封容積變化進(jìn)行工作的,故常稱其為容積式泵。單向閥5和6是保證液壓泵正常吸油和壓油所必須的配油裝置。液壓泵的工作原理及主要結(jié)構(gòu)特點(diǎn) 類型 結(jié)構(gòu)、原理示意圖 工作原理 結(jié)構(gòu)特點(diǎn) 外嚙合齒輪泵 當(dāng)齒輪旋轉(zhuǎn)時(shí),在A腔,由于輪齒脫開使容積逐漸增大,形成真空從油箱吸油,隨著齒輪的旋轉(zhuǎn)充滿在齒槽內(nèi)的油被到B腔,在B腔,由于輪齒嚙合,容積逐漸減小,把液壓油排出 利用齒和泵殼形成的封閉容積的變化,完成泵的功能,不需要配流裝置,不能變量 結(jié)構(gòu)zui簡單、價(jià)格低、徑向載荷大 內(nèi)嚙合齒輪泵 當(dāng)傳動(dòng)軸帶動(dòng)外齒輪旋轉(zhuǎn)時(shí),與此相嚙合的內(nèi)齒輪也隨著旋轉(zhuǎn)。吸油腔由于輪齒脫開而吸油,經(jīng)隔板后,油液進(jìn)入壓油腔,壓油腔由于輪齒嚙合而排油 典型的內(nèi)嚙合齒輪泵主要有內(nèi)齒輪、外齒輪及隔板等組成 利用齒和齒圈形成的容積變化,完成泵的功能。在軸對(duì)稱位置上布置有吸、排油口。不能變量 尺寸比外嚙合式略小,價(jià)格比外嚙合式略高,徑向載荷大 德國力士樂液壓泵DBW10B25X/315U6EW230N9K4E5L葉片泵 轉(zhuǎn)子旋轉(zhuǎn)時(shí),葉片在離心力和壓力油的作用下,尖部緊貼在定子內(nèi)表面上。這樣兩個(gè)葉片與轉(zhuǎn)子和定子內(nèi)表面所構(gòu)成的工作積,由小到大吸油后再由大到小排油,葉片旋轉(zhuǎn)一周時(shí),完成兩次吸油和兩次排油 利用插入轉(zhuǎn)子槽內(nèi)的葉片間容積變化,完成泵的用。在軸對(duì)稱位置上布置有兩組吸油口和排油口 徑向載荷小,噪聲較低流量脈動(dòng)小 柱塞泵 柱塞泵由缸體與柱塞構(gòu)成,柱塞在缸體內(nèi)作往復(fù)運(yùn)動(dòng),在工作容積增大時(shí)吸油,工作容積減小時(shí)排油。采用端面配油 徑向載荷由缸體外周的大軸承所平衡,以限制缸體的傾斜 利用配流盤配流 傳動(dòng)軸只傳遞轉(zhuǎn)矩、軸徑較小。由于存在缸體的傾斜力矩,制造精度要求較高,否則易損壞配流盤 螺桿泵 一根主動(dòng)螺桿與兩根從動(dòng)螺桿相互嚙合,三根螺桿的嚙合線把螺旋槽分割成若干個(gè)密封容積。當(dāng)螺桿旋轉(zhuǎn)時(shí),這個(gè)密封容積沿軸向移動(dòng)而實(shí)現(xiàn)吸油和排油 利用螺桿槽內(nèi)容積的移動(dòng),產(chǎn)生泵的作用。 德國力士樂液壓泵DBW10B25X/315U6EW230N9K4E5L液壓泵的工作原理如圖3.1 所示,泵體3 和柱塞2 構(gòu)成一個(gè)密封容積,偏心輪1 由原動(dòng)機(jī)帶動(dòng)旋轉(zhuǎn),當(dāng)偏心輪由圖示位置向下轉(zhuǎn)半周時(shí),柱塞在彈簧6 的作用下向下移動(dòng),密封容積逐漸增大,形成局部真空,油箱內(nèi)的油液在大氣壓作用下,頂開單向閥4 進(jìn)入密封腔中,實(shí)現(xiàn)吸油;當(dāng)偏心輪繼續(xù)再轉(zhuǎn)半周時(shí),它推動(dòng)柱塞向上移動(dòng),密封容積逐漸減小,油液受柱塞擠壓而產(chǎn)生壓力,使單向閥4 關(guān)閉,油液頂開單向閥5 而輸入系統(tǒng),這就是壓油,液壓泵的供油壓力為p,供油流量為q。液壓泵都是依靠密封容積變化的原理來進(jìn)行工作的,故一般稱為容積式液壓泵,圖3-1所示的是一單柱塞液壓泵的工作原理圖,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有小變大時(shí)就形成部分真空,使油箱中油液在大氣壓作用下,經(jīng)吸油管頂開單向閥6進(jìn)入油箱a而實(shí)現(xiàn)吸油;反之,當(dāng)a由大變小時(shí),a腔中吸滿的油液將頂開單向閥5流入系統(tǒng)而實(shí)現(xiàn)壓油。這樣液壓泵就將原動(dòng)機(jī)輸入的機(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),液壓泵就不斷地吸油和壓油。 德國力士樂液壓泵DBW10B25X/315U6EW230N9K4E5L2.液壓泵的特點(diǎn) 單柱塞液壓泵具有一切容積式液壓泵的基本特點(diǎn): (1)具有若干個(gè)密封且又可以周期性變化空間。液壓泵輸出流量與此空間的容積變化量和單位時(shí)間內(nèi)的變化次數(shù)成正比,與其他因素?zé)o關(guān)。這是容積式液壓泵的一個(gè)重要特性。 (2)油箱內(nèi)液體的壓力必須恒等于或大于大氣壓力。這是容積式液壓泵能夠吸入油液的外部條件。因此,為保證液壓泵正常吸油,油箱必須與大氣相通,或采用密閉的充壓油箱。 (3)具有相應(yīng)的配流機(jī)構(gòu),將吸油腔和排液腔隔開,保證液壓泵有規(guī)律地、連續(xù)地吸、排液體。液壓泵的結(jié)構(gòu)原理不同,其配油機(jī)構(gòu)也不相同。 容積式液壓泵中的油腔處于吸油時(shí)稱為吸油腔。吸油腔的壓力決定于吸油高度和吸油管路的阻力,吸油高度過高或吸油管路阻力太大,會(huì)使吸油腔真空度過高而影響液壓泵的自吸能力;油腔處于壓油時(shí)稱為壓油腔,壓油腔的壓力則取決于外負(fù)載和排油管路的壓力損失,從理論上講排油壓力與液壓泵的流量無關(guān)。 容積式液壓泵排油的理論流量取決于液壓泵的有關(guān)幾何尺寸和轉(zhuǎn)速,而與排油壓力無關(guān)。但排油壓力會(huì)影響泵的內(nèi)泄露和油液的壓縮量,從而影響泵的實(shí)際輸出流量,所以液壓泵的實(shí)際輸出流量隨排油壓力的升高而降低。 液壓泵按其在單位時(shí)間內(nèi)所能輸出的油液的體積是否可調(diào)節(jié)而分為定量泵和變量泵兩類;按結(jié)構(gòu)形式可分為齒輪式、葉片式和柱塞式三大類。
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