| 摘要 |
An outer rotor of a progressive cavity pump comprising at least one inner helical rotor with Z external thread starts and at least one adapted outer rotor with a helical cavity with Z+1 internal thread starts, characterized in that at least an outer rotor (1, 3) is assembled from several concentric rotor inserts (109-113, 307-311) following closely one after another axially, with helical cavities and Z+1 internal thread starts, each rotor insert being closely surrounded by and concentrically fixed in a common rigid rotor sleeve (101, 301), and there being detachably connected to the rotor sleeve at least one removable end piece (102, 302, 303) with a principally concentric hollow extending through it axially, and that the through hollow of the end piece (102) or end pieces (302, 303) forms a gradual transition (106, 306, 312) between a principally circular cross section furthest out (135, 313, 314) and a cross section adapted to the helical cavities of the rotor inserts nearest to them (109, 307, 311).
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