在吸油腔和壓油腔之間有一段封油區(qū)，把吸油腔和壓油腔隔開。這種葉片泵每轉一周，每個工作腔就完成一次吸油和壓油，因此稱之為單作用葉片泵。轉子1不停地旋轉，泵就不斷地吸油和排油。 改變轉子1與定子2的偏心量，即可改變泵的流量。偏心量越大，流量越大。若將轉子1與定子2調成幾乎是同心的，則流量接近于零。因此單作用葉片泵大多為變量泵
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