REXROTH定量泵區(qū)分為開回路及閉回路兩種類型，兩者主要差別在于閉回路變量泵的機(jī)臺(tái)穩(wěn)定性較佳，然而成本卻也高出一倍，早期中國臺(tái)灣廠商所使用的變量泵多為閉回路類型。而目前部分大陸塑機(jī)廠家為了節(jié)省成本，采用開回路變量泵，其價(jià)格相差一倍，導(dǎo)致許多廠家以為物美價(jià)廉，撿到便宜，殊不知“一分錢，一分貨”，變量泵仍是有等級優(yōu)劣之分的，其節(jié)能效果及機(jī)臺(tái)穩(wěn)定性更是有很大差別。因此，在選用變量節(jié)能機(jī)時(shí)應(yīng)特別注意所配置的變量泵類型究竟是開回路還是閉回路，因?yàn)槠鋵τ跈C(jī)臺(tái)穩(wěn)定性有性的影響。此外，對于一般普通產(chǎn)品而言，花同樣的成本加裝開回路變量泵來節(jié)能，還是加裝半閉回路來提升機(jī)臺(tái)的穩(wěn)定性及重現(xiàn)性，是值得廠家仔細(xì)權(quán)衡的問題。
A10V0100DR/31R-PSC11N00
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A2VK.28.MA?OR1G00P.S03
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A4VG125DA2D2/323R-NAF02F021DT
A4VG125EP2/32+A10V028DR/31
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A4VS071DR/22R-PPB13NOO,
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E-A4VSO180DR/30R-PPB13NOO
pv7-1x/10-14re01mc0-16
pv7-1x/10-14re01mco-16
pv7-1x/10-20re01mco-10
pv7-1x/16-30re01mco-08
pv7-1x/25-45re01mc0-08
PVV21-1X/040-018RB15UDMB
PVV21-1X/045-027RJ15UUMB
PVV21-1X/055-018RA15UUVB
PVV2-1X/068RJ15UMB
pvv4-1x/098ra15umc
PVV4-1X/113RJ15UMC
PVV4-1X/122RA15RMC
PVV5-1X/154RJ15DVC
pvv5-1x/193ra15lmc
pvv52-1x/139-068ra15dlmc
PVV54-1X/139-069RA15UUMC
pvv54-1x/154-113rj15uumc
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REXROTH定量泵與標(biāo)準(zhǔn)定量泵的主要區(qū)別是輸出功率不同，變量泵的輸出功率是隨負(fù)載的變化而變化，而定量泵的輸出功率相對恒定，在小流量動(dòng)作情況下，變量泵的輸出功率很低，而定量泵的輸出功率基本恒定。 近年來，不少注塑機(jī)廠爭相研發(fā)具有節(jié)能效果的注塑機(jī)新品，尤其在中國巿場許多廠家紛紛推出標(biāo)榜配置變量泵以達(dá)到節(jié)能作用的注塑機(jī)。然而所謂“節(jié)能”的背后其實(shí)是有限制條件，而且必須付出其它代價(jià)的，必須謹(jǐn)慎選用。
REXROTH定量泵和定量泵組合的容積調(diào)速裝置，包括定量柱塞泵，定量柱塞泵一端通過出油管道與雙向比例變量柱塞泵一端連接，定量柱塞泵另一端通過吸油管道與雙向比例變量柱塞泵另一端連接，定量柱塞泵和雙向比例變量柱塞泵分別與電機(jī)連接，雙向比例變量柱塞泵與變量油缸連接，變量油缸與位移傳感器連接，位移傳感器與控制器連接，控制器與比例伺服閥連接。本實(shí)用新型采用定量泵和比例變量泵組合，并采用伺服閥控制，能夠替代進(jìn)口的大排量比例變量泵，增加雙倍排量，為液壓控制系統(tǒng)中采用大排量比例變量泵提供了價(jià)格低廉、運(yùn)行效果好的容積調(diào)速裝置；本實(shí)用新型穩(wěn)定性好、控制精確度高、有較強(qiáng)的抗干擾能力等。
REXROTH定量泵隨機(jī)臺(tái)動(dòng)作需求，提供適當(dāng)?shù)牧髁?，以達(dá)到節(jié)省能源的功效。然而，此一節(jié)能的效果在注塑一般產(chǎn)品以及薄壁產(chǎn)品，特別是高速生產(chǎn)時(shí)，卻幾乎無法顯現(xiàn)效果，只有需要長時(shí)間高保壓的產(chǎn)品，此一節(jié)能效果才會(huì)明顯，這是一般塑機(jī)廠眾所皆知的結(jié)論。但是其反應(yīng)速度、穩(wěn)定性均較差，而且會(huì)提高維修成本，降低機(jī)器壽命等負(fù)面效果，卻是許多注塑廠家所不清楚的。由于認(rèn)識(shí)不清，很容易便陷入“所有產(chǎn)品使用變量機(jī)一定可大幅節(jié)能”的誤區(qū)中。因此，在考慮是否采用變量節(jié)能機(jī)時(shí)，必須先確認(rèn)產(chǎn)品種類是否為高保壓需求的產(chǎn)品，如果只是一般產(chǎn)品或薄壁產(chǎn)品卻使用變量機(jī)來生產(chǎn)，其節(jié)能效果就顯得微不足道了。此外，在選用變量節(jié)能機(jī)時(shí)必須仔細(xì)核算所花費(fèi)的成本與所節(jié)省的費(fèi)用是否真的有利，不應(yīng)只是觀察表面的節(jié)能現(xiàn)象，而忽略背后隱藏的許多成本，包括后續(xù)的維修、保養(yǎng)、機(jī)器壽命、產(chǎn)品穩(wěn)定性等隱性成本，若選用錯(cuò)誤，不但會(huì)造成節(jié)能效果不明顯，還可能花冤枉錢。
REXROTH定量泵系統(tǒng)除具有常規(guī)比例控制系統(tǒng)的優(yōu)點(diǎn)外，更具有如下優(yōu)點(diǎn)：
①相同功率的機(jī)器，注射速度可提高25％以上，更適應(yīng)薄壁精密注射要求。由于普通PQ系統(tǒng)功率計(jì)算以保壓狀態(tài)為標(biāo)準(zhǔn)，比例變量泵系統(tǒng)在這一動(dòng)作時(shí)功率消耗很低，因而油泵排量可加大25％以上。
②系統(tǒng)發(fā)熱降低，液壓元件使用壽命延長。比例變量系統(tǒng)幾乎無節(jié)流、溢流損失，系統(tǒng)運(yùn)行時(shí)發(fā)熱大大減少。不僅可節(jié)省冷卻水之消耗，低油溫使密封元件壽命大大提高。
③能量消耗減少，系統(tǒng)效率提高。比例變量泵系統(tǒng)具有良好的自適應(yīng)性，其輸出的壓力和流量能夠與負(fù)載需求相*，解決了節(jié)流調(diào)速系統(tǒng)的流量不適應(yīng)和壓力不適應(yīng)問題，能量損耗大大減少，系統(tǒng)效率提高，節(jié)能效果十分明顯，與普通定量泵+PQ比例閥系統(tǒng)相比較，可節(jié)電25～45％。
規(guī)格5至1000
斜軸式軸向注塞泵
開式回路
6系列
標(biāo)準(zhǔn)定量泵適用于任何應(yīng)用
SAE法蘭或者螺紋工作端口
A2FO型號(hào)
規(guī)格5至1000
斜軸式軸向注塞泵
開式回路
6系列
標(biāo)準(zhǔn)定量泵適用于任何應(yīng)用
SAE法蘭或者螺紋工作端口
軸承壽命長（規(guī)格250至1000）
A4FO型號(hào)
規(guī)格16至500
軸向柱塞斜盤結(jié)構(gòu)
開式回路
系列1（規(guī)格1）
系列3（規(guī)格16至40，規(guī)格125至500）
在驅(qū)動(dòng)通軸上可另裝泵
可用HF油液工作，但運(yùn)行參數(shù)有所降低（規(guī)格71至500）
化工儀器網(wǎng)