力士乐柱塞泵A10VSO45DFR1/32R-VPB22U99 柱塞泵外置于艇体尾部时，因艇体尾锥段可以提供自然进流，且为了抑制喷口射流噪声大小，通常会取消进水流道和喷口结构；当泵喷内嵌于艇体尾部成为内置式泵喷推进系统时，还需要为泵推进单元配置独特的进流和出流管道，形成与喷泵类似的结构外形。出于描述简便的考虑，可将以艉板式喷泵、浸没式喷泵、艇尾外置式泵喷以及内置式泵喷为代表的舰艇推进器统称为泵类推进系统，其核心推进单元均是推进泵。
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