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齒輪泵技術(shù)
您的當前位置：巴特首頁 > 技術(shù)支持 > 齒輪泵技術(shù) >選用齒輪油泵與柱塞泵的優(yōu)點區(qū)別
來源：巴特計量泵、齒輪泵公司 發(fā)布時間：2013-12-09 10:03:28 瀏覽次數(shù)：次
一、 優(yōu)先流量控制
不管泵的轉(zhuǎn)速、工作壓力或支路需要的流量大小，定值一次流量控制閥總可保證設(shè)備工作所需的流量。泵的輸出流量必須大于或等于一次油路所需流量，二次流量可作它用或回油箱。定值一次流量閥（比例閥）將一次控制與液壓泵結(jié)合起來，省去管路并消除外泄漏，故降低了成本。此種齒輪泵回路的典型應(yīng)用是汽車起重機上?？梢姷降霓D(zhuǎn)向機構(gòu)，它省去了一個泵。
負載傳感流量控制閥的功能與定值一次流量控制的功能十分相近：即無論泵的轉(zhuǎn)速、工作壓力或支路抽需流量大小，均提供一次流量。但所示方案，僅通過一次油口向一次油路提供所需流量，直至其大調(diào)整值。此回路可替代標準的一次流量控制回路而獲得大輸出流量。因無載回路的壓力低于定值一次流量控制方案，故回路溫升低、無載功耗小。負載傳感比列流量控制閥與一次流量控制閥一樣，其典型應(yīng)用是動力轉(zhuǎn)向機構(gòu)。
二、旁路流量控制
對于旁路流量控制，不論泵的轉(zhuǎn)速或工作壓力高低，泵總按預(yù)定大值向系統(tǒng)供液，多余部分排回油箱或泵的入口。此方案限制了系統(tǒng)的流量，使其具有佳性能。其優(yōu)點是，通過回路規(guī)模來控制大調(diào)整流量，降低成本；將泵和閥組合成一體，并通過泵的旁通控制，使回路壓力降至低，從面減少管路及其泄漏。
旁路流量控制閥可與限定工作流量（工作速度）范圍的中團式負載傳感控制閥一起設(shè)計。此種型式的齒輪泵回路，常用于限制液壓操縱以使發(fā)動機達佳速度的垃圾載卡車或動力轉(zhuǎn)向泵回路中，也可用于固定式機械設(shè)備。
三、 卸載回路
卸載元件將在大流量泵與小功率單泵結(jié)合起來。液體從兩個泵的出口排出，起到達到預(yù)定壓力和（或）流量。這時，大流量泵便把流量從其出口循環(huán)到入口，從而減少了該齒輪泵對系統(tǒng)的輸出流量，即將磁的功率減少至略高于高壓部分工作的所需值。流量降低的百分比取決于此時未卸載排量占總排量的比率，組合或螺紋聯(lián)接卸載閥減少乃至消除了管路、孔道和輔件及其它可能的泄漏。
簡單的卸載元件由人工操縱。彈簧使卸載閥接通或關(guān)閉，當給閥一操縱信號時，閥的通斷狀態(tài)好被切換。杠桿或其它機械機構(gòu)是操縱這種閥的簡單方法。
導(dǎo)控（氣動或液壓）卸載閥是操縱方式的一種改進，因為此為閥可進行遠程控制。其大的進展是采用電氣或電子關(guān)控制的電磁閥，它不僅可用遠程控制，而且可用微機自動控制，通常認為這種簡單的卸載技術(shù)是應(yīng)用的佳情況。
人工操縱卸載元件常用于為快速運作而需大流量及快速運作而需大流量及為精準控制而減少流量的回路，例如快速伸縮的起重臂回路。圖1所示回路的卸載無操縱信號作用（左位）時，回路一直輸出大流量。對于常開閥，在常態(tài)下回路將輸出小流量。壓力傳感卸載是普遍的方案。如圖2所示，彈簧作用使卸載閥處于其大流量位置（左位）?；芈穳毫_到溢流閥預(yù)調(diào)值時，溢流閥開啟，卸載閥在液壓下和作用下切換至其小流量位置（右位）。壓力傳感卸載閥基本上是一個達到系統(tǒng)壓力即卸的自動卸載元件，普遍用于測程儀分裂和液壓虎鉗中。
流量傳感卸載回路中的卸載閥也是由彈簧將其壓向大流量位置（左們）。該閥中的固定節(jié)流孔尺寸按設(shè)備的發(fā)動機佳速度所需流量確定。若發(fā)動機速度超出此佳范圍，則節(jié)流小孔壓降將增加，從而將卸載閥移位至小流量位置（右位）。因此大流量泵相鄰的元件做成可對大流量節(jié)流的尺寸，故此回路能耗少、工作平穩(wěn)且成本較低。這種回路的典型應(yīng)用是，限定回路流量達佳范圍以提高整個系統(tǒng)的性能，或限定機器高速行駛期間的回路壓力。常用于垃圾運載卡車等。
壓力流量傳感卸載回路的卸載閥也是由彈簧壓向大流量位置（左位），無論達到預(yù)定壓力還是流量，都會卸載。設(shè)備在空轉(zhuǎn)或正常工作速度下均可完成高壓工作。此特性減少了不必要的流量，故降低了所需的功率。因為此種回路具有較寬的負載和速度變化范圍，故常用于挖掘設(shè)備。
具有功率綜合的壓力傳感卸載回路，它由兩組略加變化的壓力傳感卸載泵組成，兩組泵由同一原動機驅(qū)動，每臺磁接受另一卸載泵的導(dǎo)控卸載信號。此咱傳感方式稱之為交互傳感，它可使一組泵在高壓下工作而另一級泵大流量下工作。兩只溢流閥可按每個回路特殊的壓力調(diào)整，以使一臺或兩臺泵卸載。此方案減少了功率需求，故可采用小容量價廉原動機。
所示為負載傳感卸載回路。當主控閥的控制閥（下腔）無負載傳感信號時，泵的所有流量經(jīng)閥1、閥2排回油箱；當給此控制閥施加負載傳感信號時，泵向回路供液；當泵的輸出壓力超過負載傳感閥的壓力預(yù)定值時，泵僅向回路提供工作流量，而多余流量經(jīng)閥2的節(jié)流位置（上位）旁通回油箱。帶負載傳感元件的齒輪泵與柱塞泵相比，具有低成本、抗污染能力強及維護要求低的優(yōu)點。
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