双作用叶片泵的工作原理
它的作用原理和单作用叶片泵相似，不同之处只在于定子表面是由两段长半径圆弧、两段短半径圆弧和四段过渡曲线八个部分组成，且定子和转子是同心的。在图示转子顺时针方向旋转的情况下，密封工作腔的容积在左上角和右下角处逐渐增大，为吸油区，在左下角和右上角处逐渐减小，为压油区；吸油区和压油区之间有一段封油区把它们隔开。这种泵的转子每转一转，每个密封工作腔完成吸油和压油动作各两次，所以称为双作用叶片泵。泵的两个吸油区和两个压油区是径向对称的，作用在转子上的液压力径向平衡，所以又称为平衡式叶片泵。
双作用叶片泵的瞬时流量是脉动的，当叶片数为4的倍数时脉动率小。为此，双作用叶片泵的叶片数一般都取12或16。
20V2A 叶片泵
20V2A-1A22R
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20V3A
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20V4A
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20V5A
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20V6A
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20V7A
20V7A-1A22R
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20V8A
20V8A-1A22R
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20V9A
20V9A-1A22R
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20V10A
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20V11A
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20V12A
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20V14A
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25V10A
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25V12A
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25V14A
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25V15A
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25V17A
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25V19A
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25V21A
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35V21A
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35V25A
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35V30A
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35V32A
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35V35A
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35V38A
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45V42A
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45V45A
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45V50A
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45V57A
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