Heishin Ltd.

Eiji Uetsuji

Noriaki Sakakihara

A uniaxial eccentric screw pump includes a stator having an insertion hole with an inner peripheral surface being internally threaded, and a rotor including a shaft being externally threaded and placed through the insertion hole in the stator. The stator has the insertion hole being an opening in a cross section, the opening includes a middle area and two end areas, and the middle area has lower contact pressure at least in a middle of the middle area than at two ends of the middle area.

Uniaxial eccentric screw pump

A uniaxial eccentric screw pump includes: a stator having an insertion hole with an inner peripheral surface being internally threaded; and a rotor being externally threaded and placed through the insertion hole. In a cross section, the rotor has a cross-sectional center displaceable in a reciprocating manner in a longitudinal direction of the insertion hole between a pair of turn positions along a center line extending in the longitudinal direction during eccentric rotation of the rotor. The rotor comes in contact with the inner peripheral surface of the insertion hole in a lateral direction of the insertion hole. An interference amount between the rotor and the stator includes a first interference amount when the cross-sectional center is at one of the turn positions and a second interference amount when the cross-sectional center is at a central axis. The first interference amount is larger than the second interference amount.

The present invention comprises: a statorthat is cylindrical and has a through hole, the through holein the shape of a female screw and being formed at a certain pitch in the flow direction from an inlet to an outlet; and a rotorthat is formed in the shape of a male screw, is inserted into the through holeof the statorto form a transport spacewith the inner circumferential surface of the through hole, and rotates to move a fluid from the inlet to the outlet through the transport spacewhile being inscribed on the inner circumferential surface. The volume of the transport spaceis reduced toward the flow direction. This prevents, reliably, the occurrence of bubbles from a fluid at a downstream-side when the fluid is transported through the transport spaceformed between the statorand the rotor

Liquid transport device with decreasing pitches

Axis eccentric screw pump with an increasing diameter rotor with a constant sectional area stator

Axis eccentric screw pump with decreasing sectional area of stator with a constant diameter rotor

The present invention comprises: a statorthat is cylindrical and has a through holethe through holein the shape of a female screw and being formed at a certain pitch in the flow direction from an inlet to an outlet; and a rotorthat is formed in the shape of a male screw, is inserted into the through holeof the statorto form a transport spacewith the inner circumferential surface of the through hole, and rotates to move a fluid from the inlet to the outlet through the transport spacewhile being inscribed on the inner circumferential surface. The volume of the transport spaceis reduced toward the flow direction. This prevents, reliably, the occurrence of bubbles from a fluid at a downstream-side when the fluid is transported through the transport spaceformed between the statorand the rotor

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Kobe, Japan

Eiji Uetsuji