Uniaxial eccentric screw pump having a flexible plastic shaft
AssigneeHeishin Sobi Kabushiki Kaisha
InventorsSumio Ono, Mikio Yamashita, Eiji Hayashi
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Abstract
This disclosure relates to a uniaxial eccentric screw pump. A boss 10a is integrally formed on one end (on the side of a pump casing 8) of the rotor 10, the screw pump 100, and one end of a flexible shaft 9 is inserted in the boss 10a and bonded together with the rotor 10 integrally by means of an adhesive. The flexible shaft 9 is made at least in part from a rod-like member which is extruded from PEEK (polyetheretherketone) which is one of the engineering plastics, into a cylinder. A metal rod 17 is provided in the middle of the flexible shaft in the longitudinal direction, or a metal sleeve is mounted over the outer circumference of the flexible shaft.
Claims30
A uniaxial eccentric screw pump comprising:
- an internal-screw type stator;
- an external screw type rotor mounted for eccentric rotation within the stator and having a center hole at one end;
- a drive shaft having a center hole at one end;
- a flexible shaft made of an engineering plastic, having a middle portion in the longitudinal direction thereof which is either formed of metal or covered by a metal sleeve, and also having longitudinal ends that fit within the center holes on the ends of the rotor and the drive shaft;
- and
- adhesive bonding the ends of the flexible shaft within the center holes.
Dependencies are inferred from the claim text.