What components does the working section of the rotor's screw in a screw pump consist of?

The working section of the screw in the rotor of a screw pump is composed of two or more segments of different diameters that are sequentially connected head to tail. The diameters of each screw segment increase successively. The rubber liner of the outer stator tube is placed in the middle segment of the outer stator tube. The parts outside the upper and lower ends of the rubber liner on the outer stator tube are the accommodating tube segments. When the rotor of the screw pump works with a screw segment of one diameter in conjunction with the rubber liner of the stator, the screw segments of other diameters enter the corresponding accommodating tube segments of the outer stator tube for idling.

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