ZJ/ZJB系列羅茨真空泵（簡稱 羅茨泵）是指泵內裝有兩個相反方向同步旋轉的葉形轉子，轉子間、轉子與泵殼內壁間有細小間隙而互不接觸的一種旋轉式變容真空泵（須與前級泵組臺方可使用），是目前獲得中、高真空主要抽氣設備之一．

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.