力士樂REXROTH齒輪泵R9009688154WRZ25R325-7X/6EG24N9EK4/D3V

德國力士樂REXROTH齒輪泵0510525018力士樂REXROTH齒輪泵是依靠泵缸與嚙合齒輪間所形成的工作容積變化和移動來輸送液體或使之增壓的回轉(zhuǎn)泵。由兩個齒輪、泵體與前后蓋組成兩個封閉空間，當齒輪轉(zhuǎn)動時，齒輪脫開側(cè)的空間的體積從小變大，形成真空，將液體吸入，齒輪嚙合側(cè)的空間的體積從大變小，而將液體擠入管路中去。吸入腔與排出腔是靠兩個齒輪的嚙合線來隔開的。力士樂REXROTH齒輪泵的排出口的壓力*取決于泵出處阻力的大小。zui基本形式就是兩個尺寸相同的齒輪在一個緊密配合的殼體內(nèi)相互嚙合旋轉(zhuǎn)，這個殼體的內(nèi)部類似“8"字形，兩個齒輪裝在里面，齒輪的外徑及兩側(cè)與殼體緊密配合。來自于擠出機的物料在吸入口進入兩個齒輪中間，并充滿這一空間，隨著齒的旋轉(zhuǎn)沿殼體運動，zui后在兩齒嚙合時排出。
力士樂REXROTH齒輪泵也叫正排量裝置，即像一個缸筒內(nèi)的活塞，當一個齒進入另一個齒的流體空間時，液體就被機械性地擠排出來。因為液體是不可壓縮的，所以液體和齒就不能在同一時間占據(jù)同一空間，這樣，液體就被排除了。由于齒的不斷嚙合，這一現(xiàn)象就連續(xù)在發(fā)生，因而也就在泵的出口提供了一個連續(xù)排除量，泵每轉(zhuǎn)一轉(zhuǎn)，排出的量是一樣的。隨著驅(qū)動軸的不間斷地旋轉(zhuǎn)，泵也就不間斷地排出流體。泵的流量直接與泵的轉(zhuǎn)速有關(guān)。
在泵內(nèi)有很少量的流體損失，這使泵的運行效率不能達到*，因為這些流體被用來潤滑軸承及齒輪兩側(cè)，而泵體也絕不可能無間隙配合，故不能使流體*地從出口排出，所以少量的流體損失是必然的。然而泵還是可以良好地運行，對大多數(shù)擠出物料來說，仍可以達到93%～98%的效率。
對于粘度或密度在工藝中有變化的流體，這種泵不會受到太多影響。如果有一個阻尼器，比如在排出口側(cè)放一個濾網(wǎng)或一個限制器，泵則會推動流體通過它們。如果這個阻尼器在工作中變化，亦即如果濾網(wǎng)變臟、堵塞了，或限制器的背壓升高了，則泵仍將保持恒定的流量，直至達到裝置中zui弱的部件的機械極限(通常裝有一個扭矩限制器)。
PEP－II泵的齒輪與軸共為一體，采用通體淬硬工藝，可獲得更長的工作壽命。“D"型軸承結(jié)合了強制潤滑機理，使聚合物經(jīng)軸承表面，并返回到泵的進口側(cè)，以確保旋轉(zhuǎn)軸的有效潤滑。這一特性減少了聚合物滯留并降解的可能性。精密加工的泵體可使“D"型軸承與齒輪軸精確配合，確保齒輪軸不偏心，以防齒輪磨損。Parkool密封結(jié)構(gòu)與聚四氟唇型密封共同構(gòu)成水冷密封。這種密封實際上并不接觸軸的表面，它的密封原理是將聚合物冷卻到半熔融狀態(tài)而形成自密封。也可以采用Rheoseal密封，它在軸封內(nèi)表上加工有反向螺旋槽，可使聚合物被反壓回到進口。為便于安裝，制造商設(shè)計了一個環(huán)形螺栓安裝面，以使與其它設(shè)備的法蘭安裝相配合，這使得筒形法蘭的制造更容易。
PGH型內(nèi)嚙合力士樂REXROTH齒輪泵
定量泵
定排量
低噪聲
低的流量脈動
由于采用間隙密封的補償即使在低速和低粘度油液時也有高的效率，適用于廣范圍的各種粘度和轉(zhuǎn)速所有規(guī)格可自由組合組成組合泵能和PGF型內(nèi)力士樂REXROTH齒輪泵、軸向柱塞泵和葉片泵組成多聯(lián)泵
能用HFC液體工作（密封件型號W）
PGH型液壓泵是泄漏間隙補償結(jié)構(gòu)的定排量內(nèi)嚙合力士樂REXROTH齒輪泵。
它的主要組成部分有泵體(1)，軸承(1 1)，內(nèi)齒輪(2)，帶軸外齒輪(3)，滑動軸承(4)，前、后蓋(5)，端蓋(6)，安裝法蘭(7)，和定位銷(8)以及由弧形體(9 1)、支架(9 2)和密封墊(9 3)組成的弧形元件(9)。曖入和排出原理支承在油膜軸承上的帶軸外齒輪(3)驅(qū)動內(nèi)齒輪(2)以一定的方向轉(zhuǎn)動。轉(zhuǎn)動時，在約90 e范圍的吸油區(qū)內(nèi)體積增加。產(chǎn)生吸力，流體進入吸油區(qū)。月牙形的弧形元件(9)將吸油腔和排油腔隔開。在排油腔外齒輪(3)的齒和內(nèi)齒輪(2)齒嚙合，流體就從排油腔(P)排出。軸向間隙補償，軸向補償力FA由前、后蓋(5)間的壓力場(10)產(chǎn)生，作用在排油腔內(nèi)的軸向浮動板上。由于工作壓力的作用，這兩個弧形元件(9 1)和(9 2)壓向外齒輪(3)和內(nèi)f 2）的齒頂。弧形體和弧形支架的面積比和密封圈(g 3)的位置設(shè)計得使內(nèi)齒輪(2)、弧形體(9)和外齒輪(3)之間達到可靠的密封。彈性元件密封圈(9 3)能保證即使在很低的壓力下這些元件間也有適當?shù)慕佑|壓力。液*承和油膜軸承作用在帶軸外齒輪(3)上的力由油膜潤滑的徑向滑動軸承(4)承受；作周在內(nèi)齒輪(2)上的力由靜*承(11)承受。
兩個齒輪均為漸開線式齒輪加工，較長的嚙合長度使泵的排量和壓力脈動較小。這使泵的運行噪聲大大降低。

力士樂REXROTH齒輪泵R9009688154WRZ25R325-7X/6EG24N9EK4/D3V
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