ZJ/ZJB系列罗茨真空泵（简称 罗茨泵）是指泵内装有两个相反方向同步旋转的叶形转子，转子间、转子与泵壳内壁间有细小间隙而互不接触的一种旋转式变容真空泵（须与前级泵组台方可使用），是目前获得中、高真空主要抽气设备之一．

ZJ/ZJB series Roots vacuum pump (referred to as: Roots pump) refers to a kind of rotation in which the two rotors are rotated synchronously in opposite directions, and there is a small gap between the roto and the inner wall of the pump casing without contact with each other. The variable displacement vacuum pump is one of the main pumping equipments for medium and high vacuum.